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; Program: Installable Device Driver for Mouse.;; Purpose: to provide compatability with the; Microsoft MOUSE.SYS device driver.; the code here installs the driver and; hooks the IVT in exactly the same; way as the current Insignia MOUSE.COM.;; Version: 1.00 Date: 28th October 1992.;; Author: Andrew Watson;; Revisions:;; 23-June-1994 Williamh, made mode 4/5 and 12 work.;; 12-Sep-1992 Jonle, Merged with ntio.sys; optimized loading of IVT;; 5-March-1993 Andyw, Moved fullscreen text pointer code; from 32bit land to 16bit driver for; for speed purposes.;; This obj module is intially loaded in a temporary memory location; along with ntio.sys. Ntio.sys will copy the resident code (marked by; SpcMseBeg, SpcMseEnd) into the permanent memory location which resides; just below the normal device drivers loaded by config.sys.;; The nonresident intialization code is run with CS= temp seg; and DS= final seg.;;;****************************************************************
.286 include vint.inc
;================================================================; Defined constants used in the driver.;================================================================
VERSIONID equ 0BEEFh MAXCMD equ 16 UNKNOWN equ 8003h DONE equ 0100h MOUSEVER equ 0003h INT1_BOP equ 0BAh INT2_BOP equ 0BBh IO_LANG_BOP equ 0BCh IO_INTR_BOP equ 0BDh VIDEO_IO_BOP equ 0BEh UNSIMULATE_BOP equ 0FEh VIDEO equ 010h UNEXP_BOP equ 2 STACKSIZE equ 200h-1
TRUE equ 0 FALSE equ 1 STORED equ 0 NOTSTORED equ 1 ON equ 0 OFF equ 1
MAJOR_RELEASE_NUMBER equ 6 MINOR_RELEASE_NUMBER equ 26
ifdef DBCS MAX_VIDEO_NUMBER equ 013h DBCS_TEXT_MODE_NUMBER equ MAX_VIDEO_NUMBER + 1 DBCS_GRAPHIC_MODE_NUMBER equ 12hendif ; DBCS
;MACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROS
bop MACRO callid db 0c4h,0c4h,callidendm
;=============================================================================; Macro to reassign the stack segment register to point at the driver code; segment and the stack pointer to point to the most significant word in an; array reserved as the driver stack.;=============================================================================
;; !!!! interrupt must be disabled before calling this function !!!!!!
make_stack MACRO LOCAL reent ;; a local symbol to this macro;; call DOCLI ;; turn off interrupts during this ;; macro's execution even if the CPU ;; does this for you when modifying SS inc cs:reentrant ;; has the interrupt been nested? jnz reent ;; not reentrant if == zero
;; The driver code is not reentrant, so start the stack at the beginning
mov cs:top_of_stack,ss ;; save the entry SS mov cs:top_of_stack-2,sp ;; save SP on the stack push cs ;; the current code/data segment pop ss ;; point SS at CS
;; point SP at the next free stack location.
mov sp,offset top_of_stack-2 ;; The current stack pointer position
reent: ;; REENTRANT > 0 therefore reentrancy exists ;; The driver has gone reentrant due to a nested interrupt, so just ;; leave the stack alone because it is the same under reentrancy.
;; call DOSTI ;; reenable interrupts
ENDM
;=============================================================================; Macro to return the stack pointer and segment back to what it was when; the driver was called.;=============================================================================
kill_stack MACRO LOCAL reent1;; cli cmp cs:reentrant,0 ;; is the code currently reentrant? jg reent1 ;; yes it is mov sp,cs:top_of_stack-2 ;; pop SP mov ss,cs:top_of_stack ;; pop SSreent1: dec cs:reentrant ;; reduce the level of reentrancy;; call DOSTI ENDM
;MACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROS
;; Segment definitions for ntio.sys,;include biosseg.inc
SpcMseSeg segment assume cs:SpcMseSeg, ds:nothing, es:nothing
;; SpcMseBeg - SpcMseEnd;; Marks the resident code, anything outside of these markers; is discarded after intialization; 15-Sep-1992 Jonle;
public SpcMseBeg
SpcMseBeg label byte
; CAUTION: for crazy apps mouse recognition ; ; The offset for int33h_vector must not be Zero for Borlands QuattroPro ; The segment must not be in ROM area for pctools ; to keep the int33h_vector from having an offset of ZERO ; I have moved the data above it ; 25-Sep-1992 Jonle
; describe the default screen and cursor masks; remember that x86 machines are little-endian
;;; include pointer.inc ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;; We'll Get this back to an include file soon but I'm including it like ;;;; this for 'diplomatic' reasons. (ie I want to check this in without ;;;; also doing an 'addfile' at this stage)!!! - Simon. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; This data will be accessed, on occasion, word by word, so; be tidy and align to a word boundary
align 2
; Describe the default mouse pointer image. This is used if the; user decides to switch on the pointer without specifying an image.
default_cursor dw 0011111111111111b dw 0001111111111111b dw 0000111111111111b dw 0000011111111111b dw 0000001111111111b dw 0000000111111111b dw 0000000011111111b dw 0000000001111111b dw 0000000000111111b dw 0000000000011111b dw 0000000111111111b dw 0001000011111111b dw 0011000011111111b dw 1111100001111111b dw 1111100001111111b dw 1111110001111111b dw 0000000000000000b dw 0100000000000000b dw 0110000000000000b dw 0111000000000000b dw 0111100000000000b dw 0111110000000000b dw 0111111000000000b dw 0111111100000000b dw 0111111110000000b dw 0111110000000000b dw 0110110000000000b dw 0100011000000000b dw 0000011000000000b dw 0000001100000000b dw 0000001100000000b dw 0000000000000000b
; Set up the memory where the working cursor is situated. It is ; initialised to the default cursor image
;****************** ALIGNED FOR PIXEL ZERO *******************************
; screen mask
evencurrent_cursor db 00111111b,11111111b,11111111b db 00011111b,11111111b,11111111b db 00001111b,11111111b,11111111b db 00000111b,11111111b,11111111b db 00000011b,11111111b,11111111b db 00000001b,11111111b,11111111b db 00000000b,11111111b,11111111b db 00000000b,01111111b,11111111b db 00000000b,00111111b,11111111b db 00000000b,00011111b,11111111b db 00000001b,11111111b,11111111b db 00010000b,11111111b,11111111b db 00110000b,11111111b,11111111b db 11111000b,01111111b,11111111b db 11111000b,01111111b,11111111b db 11111100b,01111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 01000000b,00000000b,00000000b db 01100000b,00000000b,00000000b db 01110000b,00000000b,00000000b db 01111000b,00000000b,00000000b db 01111100b,00000000b,00000000b db 01111110b,00000000b,00000000b db 01111111b,00000000b,00000000b db 01111111b,10000000b,00000000b db 01111111b,11000000b,00000000b db 01101100b,00000000b,00000000b db 01000110b,00000000b,00000000b db 00000110b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL ONE *******************************
; screen mask
AlignData1: db 10011111b,11111111b,11111111b db 10001111b,11111111b,11111111b db 10000111b,11111111b,11111111b db 10000011b,11111111b,11111111b db 10000001b,11111111b,11111111b db 10000000b,11111111b,11111111b db 10000000b,01111111b,11111111b db 10000000b,00111111b,11111111b db 10000000b,00011111b,11111111b db 10000000b,00001111b,11111111b db 10000000b,11111111b,11111111b db 10001000b,01111111b,11111111b db 10011000b,01111111b,11111111b db 11111100b,00111111b,11111111b db 11111100b,00111111b,11111111b db 11111110b,00111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00100000b,00000000b,00000000b db 00110000b,00000000b,00000000b db 00111000b,00000000b,00000000b db 00111100b,00000000b,00000000b db 00111110b,00000000b,00000000b db 00111111b,00000000b,00000000b db 00111111b,10000000b,00000000b db 00111111b,11000000b,00000000b db 00111111b,11100000b,00000000b db 00110110b,00000000b,00000000b db 00100011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000001b,10000000b,00000000b db 00000001b,10000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL TWO *******************************
; screen mask
AlignData2: db 11001111b,11111111b,11111111b db 11000111b,11111111b,11111111b db 11000011b,11111111b,11111111b db 11000001b,11111111b,11111111b db 11000000b,11111111b,11111111b db 11000000b,01111111b,11111111b db 11000000b,00111111b,11111111b db 11000000b,00011111b,11111111b db 11000000b,00001111b,11111111b db 11000000b,00000111b,11111111b db 11000000b,01111111b,11111111b db 11000100b,00111111b,11111111b db 11001100b,00111111b,11111111b db 11111110b,00011111b,11111111b db 11111110b,00011111b,11111111b db 11111111b,00011111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00010000b,00000000b,00000000b db 00011000b,00000000b,00000000b db 00011100b,00000000b,00000000b db 00011110b,00000000b,00000000b db 00011111b,00000000b,00000000b db 00011111b,10000000b,00000000b db 00011111b,11000000b,00000000b db 00011111b,11100000b,00000000b db 00011111b,11110000b,00000000b db 00011011b,00000000b,00000000b db 00010001b,10000000b,00000000b db 00000001b,10000000b,00000000b db 00000000b,11000000b,00000000b db 00000000b,11000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL THREE *******************************
; screen mask
AlignData3: db 11100111b,11111111b,11111111b db 11100011b,11111111b,11111111b db 11100001b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100000b,01111111b,11111111b db 11100000b,00111111b,11111111b db 11100000b,00011111b,11111111b db 11100000b,00001111b,11111111b db 11100000b,00000111b,11111111b db 11100000b,00000011b,11111111b db 11100000b,00111111b,11111111b db 11100010b,00011111b,11111111b db 11100110b,00011111b,11111111b db 11111111b,00001111b,11111111b db 11111111b,00001111b,11111111b db 11111111b,10001111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00001000b,00000000b,00000000b db 00001100b,00000000b,00000000b db 00001110b,00000000b,00000000b db 00001111b,00000000b,00000000b db 00001111b,10000000b,00000000b db 00001111b,11000000b,00000000b db 00001111b,11100000b,00000000b db 00001111b,11110000b,00000000b db 00001111b,11111000b,00000000b db 00001101b,10000000b,00000000b db 00001000b,11000000b,00000000b db 00000000b,11000000b,00000000b db 00000000b,01100000b,00000000b db 00000000b,01100000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FOUR *******************************
; screen mask
AlignData4: db 11110011b,11111111b,11111111b db 11110001b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,01111111b,11111111b db 11110000b,00111111b,11111111b db 11110000b,00011111b,11111111b db 11110000b,00001111b,11111111b db 11110000b,00000111b,11111111b db 11110000b,00000011b,11111111b db 11110000b,00000001b,11111111b db 11110000b,00011111b,11111111b db 11110001b,00001111b,11111111b db 11110011b,00001111b,11111111b db 11111111b,10000111b,11111111b db 11111111b,10000111b,11111111b db 11111111b,11000111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000100b,00000000b,00000000b db 00000110b,00000000b,00000000b db 00000111b,00000000b,00000000b db 00000111b,10000000b,00000000b db 00000111b,11000000b,00000000b db 00000111b,11100000b,00000000b db 00000111b,11110000b,00000000b db 00000111b,11111000b,00000000b db 00000111b,11111100b,00000000b db 00000110b,11000000b,00000000b db 00000100b,01100000b,00000000b db 00000000b,01100000b,00000000b db 00000000b,00110000b,00000000b db 00000000b,00110000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FIVE *******************************
; screen maskAlignData5:
db 11111001b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,01111111b,11111111b db 11111000b,00111111b,11111111b db 11111000b,00011111b,11111111b db 11111000b,00001111b,11111111b db 11111000b,00000111b,11111111b db 11111000b,00000011b,11111111b db 11111000b,00000001b,11111111b db 11111000b,00000000b,11111111b db 11111000b,00001111b,11111111b db 11111000b,10000111b,11111111b db 11111001b,10000111b,11111111b db 11111111b,11000011b,11111111b db 11111111b,11000011b,11111111b db 11111111b,11100011b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000010b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,10000000b,00000000b db 00000011b,11000000b,00000000b db 00000011b,11100000b,00000000b db 00000011b,11110000b,00000000b db 00000011b,11111000b,00000000b db 00000011b,11111100b,00000000b db 00000011b,11111110b,00000000b db 00000011b,01100000b,00000000b db 00000010b,00110000b,00000000b db 00000000b,00110000b,00000000b db 00000000b,00011000b,00000000b db 00000000b,00011000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SIX *******************************
; screen mask
AlignData6: db 11111100b,11111111b,11111111b db 11111100b,01111111b,11111111b db 11111100b,00111111b,11111111b db 11111100b,00011111b,11111111b db 11111100b,00001111b,11111111b db 11111100b,00000111b,11111111b db 11111100b,00000011b,11111111b db 11111100b,00000001b,11111111b db 11111100b,00000000b,11111111b db 11111100b,00000000b,01111111b db 11111100b,00000111b,11111111b db 11111100b,01000011b,11111111b db 11111100b,11000011b,11111111b db 11111111b,11100001b,11111111b db 11111111b,11100001b,11111111b db 11111111b,11110001b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,10000000b,00000000b db 00000001b,11000000b,00000000b db 00000001b,11100000b,00000000b db 00000001b,11110000b,00000000b db 00000001b,11111000b,00000000b db 00000001b,11111100b,00000000b db 00000001b,11111110b,00000000b db 00000001b,11111111b,00000000b db 00000001b,10110000b,00000000b db 00000001b,00011000b,00000000b db 00000000b,00011000b,00000000b db 00000000b,00001100b,00000000b db 00000000b,00001100b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SEVEN *******************************
; screen maskAlignData7:
db 11111110b,01111111b,11111111b db 11111110b,00111111b,11111111b db 11111110b,00011111b,11111111b db 11111110b,00001111b,11111111b db 11111110b,00000111b,11111111b db 11111110b,00000011b,11111111b db 11111110b,00000001b,11111111b db 11111110b,00000000b,11111111b db 11111110b,00000000b,01111111b db 11111110b,00000000b,00111111b db 11111110b,00000011b,11111111b db 11111110b,00100001b,11111111b db 11111110b,01100001b,11111111b db 11111111b,11110000b,11111111b db 11111111b,11110000b,11111111b db 11111111b,11111000b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000000b,10000000b,00000000b db 00000000b,11000000b,00000000b db 00000000b,11100000b,00000000b db 00000000b,11110000b,00000000b db 00000000b,11111000b,00000000b db 00000000b,11111100b,00000000b db 00000000b,11111110b,00000000b db 00000000b,11111111b,00000000b db 00000000b,11111111b,10000000b db 00000000b,11011000b,00000000b db 00000000b,10001100b,00000000b db 00000000b,00001100b,00000000b db 00000000b,00000110b,00000000b db 00000000b,00000110b,00000000b db 00000000b,00000000b,00000000b
; Data area reserved for the clipped cursor images. When the pointer; reaches byte 78 in the current raster, the image needs to be clipped; to prevent it from being wrapped to the left hand edge of the screen.; The image below stops that from happening by loading the image with; a 1's partial AND mask and a 0's partial XOR mask.; Note that byte 79 also needs a clipped image set.
evenclip_cursor78 db 00111111b,11111111b,11111111b db 00011111b,11111111b,11111111b db 00001111b,11111111b,11111111b db 00000111b,11111111b,11111111b db 00000011b,11111111b,11111111b db 00000001b,11111111b,11111111b db 00000000b,11111111b,11111111b db 00000000b,01111111b,11111111b db 00000000b,00111111b,11111111b db 00000000b,00011111b,11111111b db 00000001b,11111111b,11111111b db 00010000b,11111111b,11111111b db 00110000b,11111111b,11111111b db 11111000b,01111111b,11111111b db 11111000b,01111111b,11111111b db 11111100b,01111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 01000000b,00000000b,00000000b db 01100000b,00000000b,00000000b db 01110000b,00000000b,00000000b db 01111000b,00000000b,00000000b db 01111100b,00000000b,00000000b db 01111110b,00000000b,00000000b db 01111111b,00000000b,00000000b db 01111111b,10000000b,00000000b db 01111111b,11000000b,00000000b db 01101100b,00000000b,00000000b db 01000110b,00000000b,00000000b db 00000110b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL ONE *******************************
; screen mask
AlignClip178: db 10011111b,11111111b,11111111b db 10001111b,11111111b,11111111b db 10000111b,11111111b,11111111b db 10000011b,11111111b,11111111b db 10000001b,11111111b,11111111b db 10000000b,11111111b,11111111b db 10000000b,01111111b,11111111b db 10000000b,00111111b,11111111b db 10000000b,00011111b,11111111b db 10000000b,00001111b,11111111b db 10000000b,11111111b,11111111b db 10001000b,01111111b,11111111b db 10011000b,01111111b,11111111b db 11111100b,00111111b,11111111b db 11111100b,00111111b,11111111b db 11111110b,00111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00100000b,00000000b,00000000b db 00110000b,00000000b,00000000b db 00111000b,00000000b,00000000b db 00111100b,00000000b,00000000b db 00111110b,00000000b,00000000b db 00111111b,00000000b,00000000b db 00111111b,10000000b,00000000b db 00111111b,11000000b,00000000b db 00111111b,11100000b,00000000b db 00110110b,00000000b,00000000b db 00100011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000001b,10000000b,00000000b db 00000001b,10000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL TWO *******************************
; screen mask
AlignClip278: db 11001111b,11111111b,11111111b db 11000111b,11111111b,11111111b db 11000011b,11111111b,11111111b db 11000001b,11111111b,11111111b db 11000000b,11111111b,11111111b db 11000000b,01111111b,11111111b db 11000000b,00111111b,11111111b db 11000000b,00011111b,11111111b db 11000000b,00001111b,11111111b db 11000000b,00000111b,11111111b db 11000000b,01111111b,11111111b db 11000100b,00111111b,11111111b db 11001100b,00111111b,11111111b db 11111110b,00011111b,11111111b db 11111110b,00011111b,11111111b db 11111111b,00011111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00010000b,00000000b,00000000b db 00011000b,00000000b,00000000b db 00011100b,00000000b,00000000b db 00011110b,00000000b,00000000b db 00011111b,00000000b,00000000b db 00011111b,10000000b,00000000b db 00011111b,11000000b,00000000b db 00011111b,11100000b,00000000b db 00011111b,11110000b,00000000b db 00011011b,00000000b,00000000b db 00010001b,10000000b,00000000b db 00000001b,10000000b,00000000b db 00000000b,11000000b,00000000b db 00000000b,11000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL THREE *******************************
; screen mask
AlignClip378: db 11100111b,11111111b,11111111b db 11100011b,11111111b,11111111b db 11100001b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100000b,01111111b,11111111b db 11100000b,00111111b,11111111b db 11100000b,00011111b,11111111b db 11100000b,00001111b,11111111b db 11100000b,00000111b,11111111b db 11100000b,00000011b,11111111b db 11100000b,00111111b,11111111b db 11100010b,00011111b,11111111b db 11100110b,00011111b,11111111b db 11111111b,00001111b,11111111b db 11111111b,00001111b,11111111b db 11111111b,10001111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00001000b,00000000b,00000000b db 00001100b,00000000b,00000000b db 00001110b,00000000b,00000000b db 00001111b,00000000b,00000000b db 00001111b,10000000b,00000000b db 00001111b,11000000b,00000000b db 00001111b,11100000b,00000000b db 00001111b,11110000b,00000000b db 00001111b,11111000b,00000000b db 00001101b,10000000b,00000000b db 00001000b,11000000b,00000000b db 00000000b,11000000b,00000000b db 00000000b,01100000b,00000000b db 00000000b,01100000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FOUR *******************************
; screen mask
AlignClip478: db 11110011b,11111111b,11111111b db 11110001b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,01111111b,11111111b db 11110000b,00111111b,11111111b db 11110000b,00011111b,11111111b db 11110000b,00001111b,11111111b db 11110000b,00000111b,11111111b db 11110000b,00000011b,11111111b db 11110000b,00000001b,11111111b db 11110000b,00011111b,11111111b db 11110001b,00001111b,11111111b db 11110011b,00001111b,11111111b db 11111111b,10000111b,11111111b db 11111111b,10000111b,11111111b db 11111111b,11000111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000100b,00000000b,00000000b db 00000110b,00000000b,00000000b db 00000111b,00000000b,00000000b db 00000111b,10000000b,00000000b db 00000111b,11000000b,00000000b db 00000111b,11100000b,00000000b db 00000111b,11110000b,00000000b db 00000111b,11111000b,00000000b db 00000111b,11111100b,00000000b db 00000110b,11000000b,00000000b db 00000100b,01100000b,00000000b db 00000000b,01100000b,00000000b db 00000000b,00110000b,00000000b db 00000000b,00110000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FIVE *******************************
; screen maskAlignClip578:
db 11111001b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,01111111b,11111111b db 11111000b,00111111b,11111111b db 11111000b,00011111b,11111111b db 11111000b,00001111b,11111111b db 11111000b,00000111b,11111111b db 11111000b,00000011b,11111111b db 11111000b,00000001b,11111111b db 11111000b,00000000b,11111111b db 11111000b,00001111b,11111111b db 11111000b,10000111b,11111111b db 11111001b,10000111b,11111111b db 11111111b,11000011b,11111111b db 11111111b,11000011b,11111111b db 11111111b,11100011b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000010b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,10000000b,00000000b db 00000011b,11000000b,00000000b db 00000011b,11100000b,00000000b db 00000011b,11110000b,00000000b db 00000011b,11111000b,00000000b db 00000011b,11111100b,00000000b db 00000011b,11111110b,00000000b db 00000011b,01100000b,00000000b db 00000010b,00110000b,00000000b db 00000000b,00110000b,00000000b db 00000000b,00011000b,00000000b db 00000000b,00011000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SIX *******************************
; screen mask
AlignClip678: db 11111100b,11111111b,11111111b db 11111100b,01111111b,11111111b db 11111100b,00111111b,11111111b db 11111100b,00011111b,11111111b db 11111100b,00001111b,11111111b db 11111100b,00000111b,11111111b db 11111100b,00000011b,11111111b db 11111100b,00000001b,11111111b db 11111100b,00000000b,11111111b db 11111100b,00000000b,11111111b db 11111100b,00000111b,11111111b db 11111100b,01000011b,11111111b db 11111100b,11000011b,11111111b db 11111111b,11100001b,11111111b db 11111111b,11100001b,11111111b db 11111111b,11110001b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,10000000b,00000000b db 00000001b,11000000b,00000000b db 00000001b,11100000b,00000000b db 00000001b,11110000b,00000000b db 00000001b,11111000b,00000000b db 00000001b,11111100b,00000000b db 00000001b,11111110b,00000000b db 00000001b,11111111b,00000000b db 00000001b,10110000b,00000000b db 00000001b,00011000b,00000000b db 00000000b,00011000b,00000000b db 00000000b,00001100b,00000000b db 00000000b,00001100b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SEVEN *******************************
; screen maskAlignClip778:
db 11111110b,01111111b,11111111b db 11111110b,00111111b,11111111b db 11111110b,00011111b,11111111b db 11111110b,00001111b,11111111b db 11111110b,00000111b,11111111b db 11111110b,00000011b,11111111b db 11111110b,00000001b,11111111b db 11111110b,00000000b,11111111b db 11111110b,00000000b,11111111b db 11111110b,00000000b,11111111b db 11111110b,00000011b,11111111b db 11111110b,00100001b,11111111b db 11111110b,01100001b,11111111b db 11111111b,11110000b,11111111b db 11111111b,11110000b,11111111b db 11111111b,11111000b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000000b,10000000b,00000000b db 00000000b,11000000b,00000000b db 00000000b,11100000b,00000000b db 00000000b,11110000b,00000000b db 00000000b,11111000b,00000000b db 00000000b,11111100b,00000000b db 00000000b,11111110b,00000000b db 00000000b,11111111b,00000000b db 00000000b,11111111b,00000000b db 00000000b,11011000b,00000000b db 00000000b,10001100b,00000000b db 00000000b,00001100b,00000000b db 00000000b,00000110b,00000000b db 00000000b,00000110b,00000000b db 00000000b,00000000b,00000000b
clip_cursor79 db 00111111b,11111111b,11111111b db 00011111b,11111111b,11111111b db 00001111b,11111111b,11111111b db 00000111b,11111111b,11111111b db 00000011b,11111111b,11111111b db 00000001b,11111111b,11111111b db 00000000b,11111111b,11111111b db 00000000b,11111111b,11111111b db 00000000b,11111111b,11111111b db 00000000b,11111111b,11111111b db 00000001b,11111111b,11111111b db 00010000b,11111111b,11111111b db 00110000b,11111111b,11111111b db 11111000b,01111111b,11111111b db 11111000b,01111111b,11111111b db 11111100b,01111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 01000000b,00000000b,00000000b db 01100000b,00000000b,00000000b db 01110000b,00000000b,00000000b db 01111000b,00000000b,00000000b db 01111100b,00000000b,00000000b db 01111110b,00000000b,00000000b db 01111111b,00000000b,00000000b db 01111111b,00000000b,00000000b db 01111111b,00000000b,00000000b db 01101100b,00000000b,00000000b db 01000110b,00000000b,00000000b db 00000110b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL ONE *******************************
; screen mask
AlignClip179: db 10011111b,11111111b,11111111b db 10001111b,11111111b,11111111b db 10000111b,11111111b,11111111b db 10000011b,11111111b,11111111b db 10000001b,11111111b,11111111b db 10000000b,11111111b,11111111b db 10000000b,11111111b,11111111b db 10000000b,11111111b,11111111b db 10000000b,11111111b,11111111b db 10000000b,11111111b,11111111b db 10000000b,11111111b,11111111b db 10001000b,11111111b,11111111b db 10011000b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111110b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00100000b,00000000b,00000000b db 00110000b,00000000b,00000000b db 00111000b,00000000b,00000000b db 00111100b,00000000b,00000000b db 00111110b,00000000b,00000000b db 00111111b,00000000b,00000000b db 00111111b,00000000b,00000000b db 00111111b,00000000b,00000000b db 00111111b,00000000b,00000000b db 00110110b,00000000b,00000000b db 00100011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL TWO *******************************
; screen mask
AlignClip279: db 11001111b,11111111b,11111111b db 11000111b,11111111b,11111111b db 11000011b,11111111b,11111111b db 11000001b,11111111b,11111111b db 11000000b,11111111b,11111111b db 11000000b,11111111b,11111111b db 11000000b,11111111b,11111111b db 11000000b,11111111b,11111111b db 11000000b,11111111b,11111111b db 11000000b,11111111b,11111111b db 11000000b,11111111b,11111111b db 11000100b,11111111b,11111111b db 11001100b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00010000b,00000000b,00000000b db 00011000b,00000000b,00000000b db 00011100b,00000000b,00000000b db 00011110b,00000000b,00000000b db 00011111b,00000000b,00000000b db 00011111b,00000000b,00000000b db 00011111b,00000000b,00000000b db 00011111b,00000000b,00000000b db 00011111b,00000000b,00000000b db 00011011b,00000000b,00000000b db 00010001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL THREE *******************************
; screen mask
AlignClip379: db 11100111b,11111111b,11111111b db 11100011b,11111111b,11111111b db 11100001b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100000b,11111111b,11111111b db 11100010b,11111111b,11111111b db 11100110b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00001000b,00000000b,00000000b db 00001100b,00000000b,00000000b db 00001110b,00000000b,00000000b db 00001111b,00000000b,00000000b db 00001111b,00000000b,00000000b db 00001111b,00000000b,00000000b db 00001111b,00000000b,00000000b db 00001111b,00000000b,00000000b db 00001111b,00000000b,00000000b db 00001101b,00000000b,00000000b db 00001000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FOUR *******************************
; screen mask
AlignClip479: db 11110011b,11111111b,11111111b db 11110001b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110000b,11111111b,11111111b db 11110001b,11111111b,11111111b db 11110011b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000100b,00000000b,00000000b db 00000110b,00000000b,00000000b db 00000111b,00000000b,00000000b db 00000111b,00000000b,00000000b db 00000111b,00000000b,00000000b db 00000111b,00000000b,00000000b db 00000111b,00000000b,00000000b db 00000111b,00000000b,00000000b db 00000111b,00000000b,00000000b db 00000110b,00000000b,00000000b db 00000100b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FIVE *******************************
; screen maskAlignClip579:
db 11111001b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111000b,11111111b,11111111b db 11111001b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000010b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000011b,00000000b,00000000b db 00000010b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SIX *******************************
; screen mask
AlignClip679: db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111100b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000001b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SEVEN *******************************
; screen maskAlignClip779:
db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111110b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b db 00000000b,00000000b,00000000b
CursorOffsetLUT dw current_cursor dw AlignData1 dw AlignData2 dw AlignData3 dw AlignData4 dw AlignData5 dw AlignData6 dw AlignData7ClipOffsetLUT78 dw clip_cursor78 dw AlignClip178 dw AlignClip278 dw AlignClip378 dw AlignClip478 dw AlignClip578 dw AlignClip678 dw AlignClip778ClipOffsetLUT79 dw clip_cursor79 dw AlignClip179 dw AlignClip279 dw AlignClip379 dw AlignClip479 dw AlignClip579 dw AlignClip679 dw AlignClip779
; pointer to the current look up table set for the pointer image.; The LUTs are swapped when the pointer enters bytes 78 and 79; along a scanline to prevent the pointer wrapping around the screen.
PointerLUT label word dw offset CursorOffsetLUT ;;;;;;;;;;;;;;;;;;;;;;; ;;;; End of what should be an include for pointer.inc ;;;;;;;;;;;;;;;;;;;;;;;
even clrgend dw 06e41h,07964h,05720h,07461h,06f73h,0f36eh hiresylut dw 350,350,480,480 ;============================================================================; Surprisingly, a look up table multiply is much faster than; the shift - add instruction sequence for multiplying by 80.; So it would be crazy not to use it eh? Times by 80 is needed; to convert a raster location (1 raster = 80 bytes) in pixel; y coordinates into a video buffer byte index; Note: Multiply by 80 is also used for text mode calculations; now! Andy on the 9/3/93;============================================================================ even
mult80lut label word
mulsum=0 REPT 480 ; number of VGA scanlines for mode 12h dw mulsum mulsum=mulsum+80 ENDM
;============================================================================; A table to do a multiply by 320. This is used for converting number of; rasters into video buffer offsets for mode 13h (256 VGA colour mode).;============================================================================ even
mult320lut label word
mulsum=0 REPT 200 ; number of VGA scanlines for mode 13h dw mulsum mulsum=mulsum+320 ENDM even
;============================================================================; Look up table for use with modes 10h and 12h. This table provides the means; for the selection of a clipped or unclipped pointer image depending on the; current x position of the pointer.;============================================================================
ChooseImageLUT label word
REPT 624 dw offset CursorOffsetLUT ENDM
REPT 8 dw offset ClipOffsetLUT78 ENDM
REPT 8 dw offset ClipOffsetLUT79 ENDM
;============================================================================; Buffer arranged for 4 plane EGA video modes. The screen where; the pointer is going to be drawn is scanned plane by plane and; saved as bitplane separations.;============================================================================
even ; make sure that this data is word aligned
behindcursor dw 24 dup(?) ; Plane 0 dw 24 dup(?) ; Plane 1 dw 24 dup(?) ; Plane 2 dw 24 dup(?) ; Plane 3
;============================================================================; a table of the video buffer segment for the supported; BIOS text and graphics modes.;============================================================================
even ; make sure that this data is word aligned
videomodetable dw 0b800h,0b800h ; modes 0,1 dw 0b800h,0b800h ; modes 2,3 dw 0b800h,0b800h ; modes 4,5 dw 0b800h,0b000h ; modes 6,7 dw 0ffffh,0ffffh ; n/a dw 0ffffh,0ffffh ; n/a dw 0ffffh,0a000h ; n/a,mode 0dh dw 0a000h,0a000h ; modes 0eh,0fh dw 0a000h,0a000h ; modes 10h,11h dw 0a000h,0a000h ; modes 12h,13h videobufferseg dw ?
even ; make sure that this data is word aligned
hotspot dw 2 dup(0)
VRAMlasttextcelloff label word ; last text offset in VRAM VRAMlastbyteoff dw ? ; Last offset in VRAM VRAMlastbitoff dw ? ; LSB: Where pointer is in byte ; MSB: ODD/EVEN of the pointer ; first scan line LastXCounters dw ? ; last X looping counter LastYCounters dw ? ; last Y looping counter ; ODD in LSB and EVEN in MSB lasttextimage dw ? ; text cell from last time
background dw NOTSTORED ; STORED if data in buffer current_position_x dw ? current_position_y dw ? vidbytealigned dw ? lastmaskrotate dw ? lastvidmode db 0ffh ; the video mode during the last int. internalCF db 0ffh ; the mouse driver keeps a flag called ; the internal cursor flag. If the flag ; = 0, then int 33h f1 will display the ; pointer, -1 = default value.
; 32 bit code writes to this area on a hardware interrupt and ; when an app does an int 33h function 3, it reads the data ; directly from here. ; Data format is: word 0 -> button status ; word 1 -> x virtual coordinate ; word 2 -> y virtual coordinate
function3data dw 3 dup(?)
conditional_off db 0 ;!= 0 if conditional off is on ;;=============================================================================; Data to determine the address of where the latches should be saved in the; video buffer for the current video mode.; latchcache contains the value looked up by saveVGAregisters and used by; restoreVGAregisters.;=============================================================================
latchcache dw ? ; location of latch cache in VRAMevenlatchhomeLUT label word dw ? ; mode 0 dw ? ; mode 1 dw ? ; mode 2 dw ? ; mode 3 dw ? ; mode 4 dw ? ; mode 5 dw ? ; mode 6 dw ? ; mode 7 dw ? ; mode 8 dw ? ; mode 9 dw ? ; mode a dw ? ; mode b dw ? ; mode c dw ? ; mode d dw 80*200+78 ; mode e dw 80*350+78 ; mode f dw 80*350+78 ; mode 10 dw 80*480+78 ; mode 11 dw 80*480+78 ; mode 12ifdef DBCS dw 80*480+78 ; DBCS_TEXT_MODEendif ; DBCS
;=============================================================================; CGA video mode 4 is a 2 bit per pixel graphics mode. The pointer images; received from the application (or the default images for that matter) are; described by a one bit per pixel map. This look up table provides the means; of conversion from one to two bits per pixel.;=============================================================================evenLUT1to2bit label word dw 00000h,00003h,0000Ch,0000Fh,00030h,00033h,0003Ch,0003Fh dw 000C0h,000C3h,000CCh,000CFh,000F0h,000F3h,000FCh,000FFh dw 00300h,00303h,0030Ch,0030Fh,00330h,00333h,0033Ch,0033Fh dw 003C0h,003C3h,003CCh,003CFh,003F0h,003F3h,003FCh,003FFh dw 00C00h,00C03h,00C0Ch,00C0Fh,00C30h,00C33h,00C3Ch,00C3Fh dw 00CC0h,00CC3h,00CCCh,00CCFh,00CF0h,00CF3h,00CFCh,00CFFh dw 00F00h,00F03h,00F0Ch,00F0Fh,00F30h,00F33h,00F3Ch,00F3Fh dw 00FC0h,00FC3h,00FCCh,00FCFh,00FF0h,00FF3h,00FFCh,00FFFh
dw 03000h,03003h,0300Ch,0300Fh,03030h,03033h,0303Ch,0303Fh dw 030C0h,030C3h,030CCh,030CFh,030F0h,030F3h,030FCh,030FFh dw 03300h,03303h,0330Ch,0330Fh,03330h,03333h,0333Ch,0333Fh dw 033C0h,033C3h,033CCh,033CFh,033F0h,033F3h,033FCh,033FFh dw 03C00h,03C03h,03C0Ch,03C0Fh,03C30h,03C33h,03C3Ch,03C3Fh dw 03CC0h,03CC3h,03CCCh,03CCFh,03CF0h,03CF3h,03CFCh,03CFFh dw 03F00h,03F03h,03F0Ch,03F0Fh,03F30h,03F33h,03F3Ch,03F3Fh dw 03FC0h,03FC3h,03FCCh,03FCFh,03FF0h,03FF3h,03FFCh,03FFFh
dw 0C000h,0C003h,0C00Ch,0C00Fh,0C030h,0C033h,0C03Ch,0C03Fh dw 0C0C0h,0C0C3h,0C0CCh,0C0CFh,0C0F0h,0C0F3h,0C0FCh,0C0FFh dw 0C300h,0C303h,0C30Ch,0C30Fh,0C330h,0C333h,0C33Ch,0C33Fh dw 0C3C0h,0C3C3h,0C3CCh,0C3CFh,0C3F0h,0C3F3h,0C3FCh,0C3FFh dw 0CC00h,0CC03h,0CC0Ch,0CC0Fh,0CC30h,0CC33h,0CC3Ch,0CC3Fh dw 0CCC0h,0CCC3h,0CCCCh,0CCCFh,0CCF0h,0CCF3h,0CCFCh,0CCFFh dw 0CF00h,0CF03h,0CF0Ch,0CF0Fh,0CF30h,0CF33h,0CF3Ch,0CF3Fh dw 0CFC0h,0CFC3h,0CFCCh,0CFCFh,0CFF0h,0CFF3h,0CFFCh,0CFFFh
dw 0F000h,0F003h,0F00Ch,0F00Fh,0F030h,0F033h,0F03Ch,0F03Fh dw 0F0C0h,0F0C3h,0F0CCh,0F0CFh,0F0F0h,0F0F3h,0F0FCh,0F0FFh dw 0F300h,0F303h,0F30Ch,0F30Fh,0F330h,0F333h,0F33Ch,0F33Fh dw 0F3C0h,0F3C3h,0F3CCh,0F3CFh,0F3F0h,0F3F3h,0F3FCh,0F3FFh dw 0FC00h,0FC03h,0FC0Ch,0FC0Fh,0FC30h,0FC33h,0FC3Ch,0FC3Fh dw 0FCC0h,0FCC3h,0FCCCh,0FCCFh,0FCF0h,0FCF3h,0FCFCh,0FCFFh dw 0FF00h,0FF03h,0FF0Ch,0FF0Fh,0FF30h,0FF33h,0FF3Ch,0FF3Fh dw 0FFC0h,0FFC3h,0FFCCh,0FFCFh,0FFF0h,0FFF3h,0FFFCh,0FFFFh
;============================================================================; Table for selection of the correct pointer image for the current location; in the video buffer, when using video BIOS mode 4.;============================================================================
mode4pointerLUT label word REPT 76 ; for the first 76 bytes of scanline, use these dw current_cursor dw AlignData1 dw AlignData2 dw AlignData3 ENDM dw clip_cursor78 dw AlignClip178 dw AlignClip278 dw AlignClip378 dw AlignClip478 dw AlignClip578 dw AlignClip678 dw AlignClip778 dw clip_cursor79 dw AlignClip179 dw AlignClip279 dw AlignClip379 dw AlignClip479 dw AlignClip579 dw AlignClip679 dw AlignClip779
;============================================================================; Look up table to adjust CX on clipping in mode 4. This allows the mode4; pointer drawing algorithm to use the modes 10h/12h clipped pointer data; without having to modify it. The problem is that mode 10/12 expects the; data to be 4 bits per pixel and aligned to a word, whereas mode 4 is 2 bits; per pixel and aligns to a byte.;============================================================================
mode4clipCXadjustLUT label word adjtemp=0 ; data for pixel x-coordinates 0 -> 307 REPT 77 dw 4 dup(adjtemp) adjtemp=adjtemp+1 ENDM dw 4 dup(76) ; data for pixels 308 -> 311 dw 8 dup(78) ; data for pixels 312 -> 319
;============================================================================; The CGA buffer is split at 2000h. Therefore if the pointer starts writing; below scanline 199 on the video display, the odd scanline video buffer; will become corrupted. In these cases, the pointer should be clipped to; display scanline 199. The look up table below maps loop counters to a; display scanline for this purpose.;; table arrangement (odd scanline data, even scanline data);;============================================================================
mode4clipDXLUT label word
db 200-15 dup(8,8) ; scanlines 0 -> 184 db 8,7 ; scanline 185 db 7,7 ; scanline 186 db 7,6 ; scanline 187 db 6,6 ; scanline 188 db 6,5 ; scanline 189 db 5,5 ; scanline 190 db 5,4 ; scanline 191 db 4,4 ; scanline 192 db 4,3 ; scanline 193 db 3,3 ; scanline 194 db 3,2 ; scanline 195 db 2,2 ; scanline 196 db 2,1 ; scanline 197 db 1,1 ; scanline 198 db 1,0 ; scanline 199
mode4SelectedPointer label word dw ?
;==========================================================================; Some space into which the Medium resolution graphics pointer background; gets stored. Note that the 256 colour mode buffer encroaches on that of; mode 4.;==========================================================================
bkgrnd256 label byte ; 256 colour buffer = 24*16 @ 1 byte/pix db 384-64 dup(?) ; share the CGA buffer(=64 bytes)
CGAbackgrnd label byte
db 24/4*16 dup(?) ; 24 pixels/row @ 4 pixels/byte for 16 ; rows.ifdef DBCSdbcs_vector label DWORDdbcs_vector_off dw 0dbcs_vector_seg dw 0
evensaved_ac_on_mouse_cursor dw ?line_buffer db ((80 + 1) * 2) dup (?)mouse_cursor_offset dw ?saved_ac_cursor_position dw ?saved_ac_count dw ?saved_ac_offset dw ?active_page db ?
video_io_enter_count db 0
SCREENtoCHARCELL macro shr cx, 3 shr dx, 3 mov dh, dl mov dl, cl endm
endif ; DBCS
;===========================================================================; Jump table to redirect the code flow according to the current video mode.; Used in the 32 bit entry point procedure.; Pointer drawing routines.;===========================================================================evendrawpointerJMPT label word dw offset not_supported ; mode 0 dw offset not_supported ; mode 1IFDEF SIXTEENBIT dw offset drawTextPointer ; mode 2 dw offset drawTextPointer ; mode 3ELSE dw offset not_supported ; mode 2 dw offset not_supported ; mode 3ENDIF dw offset drawMediumResPointer ; mode 4 dw offset drawMediumResPointer ; mode 5 dw offset not_supported ; mode 6IFDEF SIXTEENBIT dw offset drawTextPointer ; mode 7ELSE dw offset not_supported ; mode 7ENDIF dw offset not_supported ; mode 8 dw offset not_supported ; mode 9 dw offset not_supported ; mode a dw offset not_supported ; mode b dw offset not_supported ; mode c dw offset not_supported ; mode d dw offset not_supported ; mode e dw offset drawHiResPointer ; mode f dw offset drawHiResPointer ; mode 10 dw offset drawHiResPointer ; mode 11 dw offset drawHiResPointer ; mode 12 dw offset drawC256pointer ; mode 13ifdef DBCS dw offset DBCS_drawTextPointer ;DBCS_TEXT_MODE_NUMBERendif ; DBCS
;===========================================================================; Jump table to redirect the code flow according to the current video mode.; Used in the 32 bit entry point procedure.; INT 33h Function 1 support modules.;===========================================================================evenint33function1JMPT label word dw offset not_supported ; mode 0 dw offset not_supported ; mode 1IFDEF SIXTEENBIT dw offset TextInt33Function1 ; mode 2 dw offset TextInt33Function1 ; mode 3ELSE dw offset not_supported ; mode 2 dw offset not_supported ; mode 3ENDIF dw offset MediumResInt33Function1 ; mode 4 dw offset MediumResInt33Function1 ; mode 5 dw offset not_supported ; mode 6IFDEF SIXTEENBIT dw offset TextInt33Function1 ; mode 7ELSE dw offset not_supported ; mode 7ENDIF dw offset not_supported ; mode 8 dw offset not_supported ; mode 9 dw offset not_supported ; mode a dw offset not_supported ; mode b dw offset not_supported ; mode c dw offset not_supported ; mode d dw offset not_supported ; mode e dw offset HiResInt33Function1 ; mode f dw offset HiResInt33Function1 ; mode 10 dw offset HiResInt33Function1 ; mode 11 dw offset HiResInt33Function1 ; mode 12 dw offset C256Int33Function1 ; mode 13ifdef DBCS dw offset DBCS_TextInt33Function1 ; DBCS_TEXT_MODE_NUMBERendif ; DBCS
;===========================================================================; Jump table to redirect the code flow according to the current video mode.; Used in the 32 bit entry point procedure.; INT 33h Function 2 support modules.;===========================================================================evenint33function2JMPT label word dw offset not_supported ; mode 0 dw offset not_supported ; mode 1IFDEF SIXTEENBIT dw offset TextInt33Function2 ; mode 2 dw offset TextInt33Function2 ; mode 3ELSE dw offset not_supported ; mode 2 dw offset not_supported ; mode 3ENDIF dw offset MediumResInt33Function2 ; mode 4 dw offset MediumResInt33Function2 ; mode 5 dw offset not_supported ; mode 6IFDEF SIXTEENBIT dw offset TextInt33Function2 ; mode 7ELSE dw offset not_supported ; mode 7ENDIF dw offset not_supported ; mode 8 dw offset not_supported ; mode 9 dw offset not_supported ; mode a dw offset not_supported ; mode b dw offset not_supported ; mode c dw offset not_supported ; mode d dw offset not_supported ; mode e dw offset HiResInt33Function2 ; mode f dw offset HiResInt33Function2 ; mode 10 dw offset HiResInt33Function2 ; mode 11 dw offset HiResInt33Function2 ; mode 12 dw offset C256Int33Function2 ; mode 13ifdef DBCS dw offset DBCS_TextInt33Function2 ; DBCS_TEXT_MODE_NUMBERendif ; DBCS
;==========================================================================; Some storage space for the critical VGA registers.;==========================================================================
;Sequencer Registers
seqregs label byte db 4 dup(?) ; N.B. sequencer reset reg doesn't ; get saved.
; Graphics Controller Registers
GCregs label byte db 9 dup(?)
;==========================================================================; The mouse driver's very own stack. To prevent unnecessary tears,; particulary from the application running in DOS land, a stack is; maintained by the driver. This prevents the driver routines from; blowing a very full stack elsewhere.; N.B. on leaving the driver, the stack should be empty!;==========================================================================
evenmouse_stack dw STACKSIZE dup(?)top_of_stack label word dw ? ; this is where the stack starts
;===========================================================================; The memory variable below is incremented on entry to the 16 bit code; and on exit, decremented. If an interrupt occurs during the execution of; this 16 bit code, the flag is incremented again, and thus greater than zero; so it is known that the code has been reentered and the stack must be; maintained accordingly.;===========================================================================
reentrant dw -1
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++;; END OF DATA;;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;================================================================; code to redirect the flow of control from the segment:offset for; the mouse interrupt (33h) as indicated in the IVT (the IVT entry; has been set to point to here) to the Insignia mouse driver code.;================================================================ifdef DBCS;; DBCS works needs this message just before the int33 vector to workscrete_msg label byte db "*** This is Copyright 1983 Microsoft ***"endif ; DBCSint33h_vector:
jmp short skip
; High level language entry point.
lvector db 0EAh ; far jump opcodeloffset dw ? ; destination offsetlseg dw ? ; destination segment
skip:db 0EAh ; far jump opcodemoff dw ? ; will be filled in by the driver code from the IVTmseg dw ? ; as before
DOCLI: FCLI ret
DOSTI: FSTI ret
DOIRET: FIRET
;================================================================; Functions moved out of ROM - real ROMS mapped in;================================================================
unexp_int: bop UNEXP_BOP jmp DOIRET
mouse_io: ; ; INT 33h entry point ;
jmp mio_hack nopmouse_io_lang: ; entry point for HLL pushf ; check ASAP if redundant show/hide cursor push di ; save di, mov di, [di+14] ; get first parameter (mouse function), ; then duplicate mio_hack below. ; this has to be done to preserve ; compatibility between both ways to ; call the mouse. jz lbop ; F0 cmp di,2 jg lbop ; >F2 je miol_2miol_1: mov conditional_off, 0 ; disable conditonal off cmp [internalCF],0 ; is the flag already zero? je miol_12_quit ; if so, do nothing inc [internalCF] ; increment it jz lbopmiol_12_quit: pop di popf jmp DOIRET
miol_2: dec [internalCF] ; decrement the pointer internal flag cmp [internalCF], 0ffh; currently displayed? jne miol_12_quitlbop: pop ax popf bop IO_LANG_BOP retf 8
mio_hack: ; int 33h handler pushf ; save up the flags cmp ax,1 ; mouse show cursor. je mio_1 cmp ax,2 ; mouse hide cursor. je mio_2 cmp ax,3 ; get button status and mouse position. je mio_3 cmp ax,9 ; set graphics cursor je mio_9 cmp ax,10 ; set text cursor - not supported je mio_quit ; return straight back to app.
jmp short hack1bop ; none of the above, so goto 32 bit land
mio_1: mov conditional_off, 0 ; disable conditional off cmp [internalCF],0 ; is the flag already zero? je mio_quit ; if so, do nothing inc [internalCF] ; increment it jz hack1bop ; just turned zero, so turn pointer on ; via the 32 bit code.mio_quit: popf jmp DOIRET
mio_2: dec [internalCF] ; decrement the pointer internal flag cmp [internalCF], 0ffh; currently displayed? jne mio_quit ; Already turned off, so quit
hack1bop: popf bop IO_INTR_BOP ; BOP to the 32 bit part of the handler jmp DOIRET ; return back after the BOP to callermio_9: call int33function9 ; change the shape of the graphics pointer popf ; restore the flag state jmp DOIRET ; back to the callermio_3: mov bx,[function3data] ; return button status mov cx,[function3data+2] ; return x coordinate mov dx,[function3data+4] ; return x coordinate popf ; return back to the application jmp DOIRET ; via an iret.
IFDEF MOUSE_VIDEO_BIOS
mouse_video_io:
pushf or ah,ah jne mvio1 jmp do_bopmvio1: cmp ax,6f05h jne mvio2 jmp do_bopmvio2: cmp ah,4 jne mvio3 jmp do_bopmvio3:
;=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
; Microsoft EGA.LIB function support ; input: AH = the function required
cmp ah,0f0h ; is function F0 or greater? jge mvio4 ; YES, so check to see if less than or == F7 jmp go_rom ; NO, so do rom stuffmvio4: cmp ah,0f7h ; is it greater than F7 jg mvio5 ; YES, so test for == FA jmp ega_lib ; NO, but in range F0 to F7, so do EGALIB emmmvio5: cmp ah,0fah jne mvio6 jmp egaFAmvio6: jmp go_rom
; to get here, must want to do mouse video functions 0f0h to 0f7h or ; function 0fah.
jmp ega_lib
; data area for EGA.LIB function support ; Notice that the sequencer register buffer only has space ; for four entrys even though it actually has five addressable ; registers. The Sequencer RESET status is not stored, so the buffer ; is arranged thus: ; buffer offset 0 1 2 3 ; register index 1 2 3 4 ;
even
ega_current_crtc db 25 dup(?) ; driver's copy of CRTC regs ega_current_seq db 4 dup(?) ; driver's copy of Seq regs ega_current_graph db 9 dup(?) ; driver's copy of GC regs ega_current_attr db 20 dup(?) ; driver's copy of AC regs ega_current_misc db ? ; driver's copy of misc reg dirty_crtc db 25 dup(?) dirty_seq db 4 dup(?) dirty_graph db 9 dup(?) dirty_attr db 20 dup(?) ega_default_crtc db 25 dup(?) ; default EGA register values ega_default_seq db 4 dup(?) ; as set by the application ega_default_graph db 9 dup(?) ; through a call to F7 ega_default_attr db 20 dup(?) ega_default_misc db ?
relnum label word
release_major db MAJOR_RELEASE_NUMBER release_minor db MINOR_RELEASE_NUMBER
even
egalibjmp label word ; crafty jump table to replace a base ; switch dw egaF0 ; 0F0h - read one EGA register dw egaF1 ; 0F1h - write one EGA register dw egaF2 ; 0F2h - read register range dw egaF3 ; 0F3h - write register range dw egaF4 ; 0F4h - read register set dw egaF5 ; 0F5h - write register set dw egaF6 ; 0F6h - revert to default regs dw egaF7 ; 0F7h - define deflt reg table dw noint ; 0F8h is not a valid function dw noint ; 0F9h is not a valid function dw egaFA ; 0FAh - interrogate driverega_lib:
xor al,al sub ax,0f0h ; create a jump table index shl ax,1 ; remember that a word pointer is reqd mov si,ax jmp [egalibjmp+si] ; get the relavent jump address
egaF0: ;--- Read an EGA register ----------------------------------------------
pusha and bx,0ffh ; just want the lower byte (BL)F00: cmp dx,0 jne F08 mov bl,byte ptr [ega_current_crtc+bx] popa jmp nointF08: cmp dx,8 jne F010 dec bx ; note that RESET is not stored mov bl,byte ptr [ega_current_seq+bx] popa jmp nointF010: cmp dx,010h jne F018 mov bl,byte ptr [ega_current_graph+bx] popa jmp nointF018: cmp dx,018h jne F020 mov bl,byte ptr [ega_current_attr+bx] popa jmp nointF020: cmp dx,020h jne F028 mov bl,byte ptr [ega_current_misc]
F028: ; do nothing for this caseF0quit: popa jmp noint
egaF1: ;--- Write an EGA register --------------------------------------------
F10: pusha cmp dx,0 jne F18 mov dx,03d4h ; write to the CRTC index register mov ax,bx ; values to write to ports 3d4/3d5 out dx,ax ; do the write mov di,bx ; save the written values to memory and di,0ffh ; get just the lower 8 bits mov byte ptr [ega_current_crtc+di],bh mov byte ptr [dirty_crtc+di],1 popa jmp nointF18: cmp dx,8 jne F110 mov dx,03c4h ; write to the Sequencer index register mov ax,bx ; values to write to ports 3c4/3c5 out dx,ax ; do the write cmp bl,0 ; Cannot index reset because it its jle F18bra1 ; not stored. range = 1->4 and bx,0ffh ; just want BL dec bx ; actually, one less than that mov byte ptr [ega_current_seq+bx],ah mov byte ptr [dirty_seq+bx],1F18bra1: popa jmp nointF110: cmp dx,010h jne F118 mov dx,03ceh ; write to the Graphics controller mov ax,bx ; values to write to ports 3ce/3cf out dx,ax ; do the write mov di,bx ; save the written values to memory and di,0ffh ; get just the lower 8 bits mov byte ptr [ega_current_graph+di],bh mov byte ptr [dirty_graph+di],1 popa jmp nointF118: cmp dx,018h jne F120 mov dx,03dah ; clear attribute controller index in al,dx ; the read clears this register mov ax,bx ; need to write BX to the ports mov dx,03c0h ; Attribute Controller index register out dx,ax ; do the write inc dx mov al,020h ; EGA palette enable out dx,al ; enable the palette mov di,bx ; save the written values to memory and di,0ffh ; get just the lower 8 bits mov byte ptr [ega_current_graph+di],bh mov byte ptr [dirty_graph+di],1 popa jmp nointF120: cmp dx,020h jne F128 mov dx,03c2h ; EGA miscellaneous register mov al,bl out dx,al ; write to the register mov [ega_current_misc],bl popa jmp nointF128: cmp dx,028h jne F128 mov dx,03dah ; EGA feature register mov al,bl out dx,alF1quit: popa jmp noint
egaF2: ;--- Read a register range ---------------------------------------------
pusha cmp dx,0 jne F28F20: lea si,ega_current_crtc ; get the address of this buffer mov dx,cx ; save this value xchg ch,cl ; create an index with CH and cx,0ffh ; only need CH (now CL) add si,cx ; SOURCE adjust the address xor dh,dh ; only want the old CL value mov cx,dx ; restore CX mov di,bx ; DESTINATION got from the application rep movsb ; copy to the app's register block popa jmp nointF28: cmp dx,8 jne F210 lea si,ega_current_seq ; get the address of this buffer mov dx,cx ; save this value xchg ch,cl ; create an index with CH and cx,0ffh ; only need CH (now CL) dec cx ; RESET is not stored, so index-1 add si,cx ; SOURCE adjust the address xor dh,dh ; only want the old CL value mov cx,dx ; restore CX mov di,bx ; DESTINATION got from the application rep movsb ; copy to the app's register block popa jmp nointF210: cmp dx,010h jne F218 lea si,ega_current_graph ; get the address of this buffer mov dx,cx ; save this value xchg ch,cl ; create an index with CH and cx,0ffh ; only need CH (now CL) add si,cx ; SOURCE adjust the address xor dh,dh ; only want the old CL value mov cx,dx ; restore CX mov di,bx ; DESTINATION got from the application rep movsb ; copy to the app's register block popa jmp nointF218: cmp dx,018h jne F2quit lea si,ega_current_attr ; get the address of this buffer mov dx,cx ; save this value xchg ch,cl ; create an index with CH and cx,0ffh ; only need CH (now CL) add si,cx ; SOURCE adjust the address xor dh,dh ; only want the old CL value mov cx,dx ; restore CX mov di,bx ; DESTINATION got from the application rep movsb ; copy the application's register blockF2quit: popa jmp noint
egaF3: ;--- Write a register range to the EGA adapter ------------------------
pusha push ds push esF31: cmp dx,0 jne F38 lea di,ega_current_crtc ; write the application data here mov al,ch ; adjust the write position as required cbw add di,ax ; DESTINATION specified address mov si,bx ; SOURCE from the application lea bx,dirty_crtc ; need to write some data into here add bx,ax ; well, at this offset anyway mov ax,es ; The application is the source mov ds,ax ; so point to its segment mov dx,03d4h ; CRTC index register mov ah,ch ; CRTC register to start at xor ch,ch ; CX is now the loop counter assume ds:nothingF31cp: mov byte ptr cs:[bx],1 ; fill in the dirty_crtc array inc bx movsb ; get the value from the app to write ; and write to the internal buffer out dx,ax ; write to the EGA adapter loop F31cp jmp F3quitF38: cmp dx,8 jne F310 lea di,ega_current_seq ; write the application data here mov al,ch ; adjust the write position as required cbw add di,ax ; DESTINATION specified address dec di ; RESET is not stored, so index-1 mov si,bx ; SOURCE from the application lea bx,dirty_seq ; need to write some data into here add bx,ax ; well, at this offset anyway inc bx mov ax,es ; The application is the source mov ds,ax ; so point to its segment mov dx,03c4h ; Sequencer index register mov ah,ch ; Sequencer register to start at inc ah xor ch,ch ; CX is now the loop counter assume ds:nothingF38cp: mov byte ptr cs:[bx],1 ; fill in the dirty_seq array inc bx movsb ; get the value from the app to write ; and write to the internal buffer out dx,ax ; write to the EGA adapter loop F38cp assume ds:SpcMseSeg jmp F3quitF310: cmp dx,010h jne F318 lea di,ega_current_graph ; write the application data here mov al,ch ; adjust the write position as required cbw add di,ax ; DESTINATION specified address mov si,bx ; SOURCE from the application lea bx,dirty_graph ; need to write some data into here add bx,ax ; well, at this offset anyway mov ax,es ; The application is the source mov ds,ax ; so point to its segment mov dx,03ceh ; Graphics Controller index register mov ah,ch ; GC register to start at xor ch,ch ; CX is now the loop counter assume ds:nothingF310cp: mov byte ptr cs:[bx],1 ; fill in the dirty_graph array inc bx movsb ; get the value from the app to write ; and write to the internal buffer out dx,ax ; write to the EGA adapter loop F310cp assume ds:SpcMseSeg jmp short F3quitF318: cmp dx,018h jne F3quit mov dx,03dah ; clear attribute controller index in al,dx ; the read clears this register lea di,ega_current_attr ; write the application data here mov al,ch ; adjust the write position as required cbw add di,ax ; DESTINATION specified address mov si,bx ; SOURCE from the application lea bx,dirty_attr ; need to write some data into here add bx,ax ; well, at this offset anyway mov ax,es ; The application is the source mov ds,ax ; so point to its segment mov dx,03c0h ; Attribute Controller index register mov ah,ch ; AC register to start at xor ch,ch ; CX is now the loop counter assume ds:nothingF318cp: mov byte ptr cs:[bx],1 ; fill in the dirty_attr array inc bx movsb ; get the value from the app to write ; and write to the internal buffer out dx,ax ; write to the EGA adapter loop F318cp assume ds:SpcMseSegF3quit: pop es pop ds popa jmp noint
egaF4: ;--- Read EGA register set ------------------------------------------- ; ; note that the incoming/outgoing data is structured thus: ; ; from application --> db Port number ; --> db must be zero ; --> db pointer value ; to application <-- db data read from register
pushaF4lp: mov al,byte ptr es:[bx] ; get the type of the next EGA register mov dl,byte ptr es:[bx+2] ; load up the offset required xor dh,dh ; convert DL to a word (DX) add bx,3 ; point to where the data should ; be written for the applicationF40: cmp al,0 jne F48 lea di,ega_current_crtc ; point to the internal CRTC reg. buffer add di,dx ; index into the buffer mov al,byte ptr [di] ; get the register value from the driver mov byte ptr es:[bx],al ; store the register value jmp short F4lp2 ; do the next loop iterationF48: cmp al,8 jne F410 lea di,ega_current_seq ; point to the internal Sequencer buffer add di,dx ; index into the buffer dec di ; RESET is not stored, so index off 1 mov al,byte ptr [di] ; get the register value from the driver mov byte ptr es:[bx],al ; store the register value jmp short F4lp2 ; do the next loop iterationF410: cmp al,010h jne F418 lea di,ega_current_graph ; point to the internal GC reg. buffer add di,dx ; index into the buffer mov al,byte ptr [di] ; get the register value from the driver mov byte ptr es:[bx],al ; store the register value jmp short F4lp2 ; do the next loop iterationF418: cmp al,018h jne F420 lea di,ega_current_attr ; point to the interal AC reg. buffer add di,dx ; index into the buffer mov al,byte ptr [di] ; get the register value from the driver mov byte ptr es:[bx],al ; store the register value jmp short F4lp2 ; do the next loop iterationF420: cmp al,020h jne F4lp2 mov al,[ega_current_misc] ; load contents of miscellaneous reg mov byte ptr[di],al ; store the register value
; the C code actually loads BL here but I don't know why!F4lp2: inc bx ; point to the next 'record' loop F4lp popa jmp noint
egaF5: ;--- Write EGA register set ------------------------------------------- ; ; note that the incoming data is structured thus: ; ; from application --> db Port number ; --> db must be zero ; --> db pointer value ; --> db data read from register
pushaF5lp: mov al,byte ptr es:[bx] ; get the type of the next EGA register mov dl,byte ptr es:[bx+2] ; load up the offset required xor dh,dh ; turn from 8 bit to a word quantity mov si,dx ; need this when accessing buffers add bx,3 ; point to where the data should ; be written for the application mov ah,byte ptr es:[bx] ; load data to send to the port inc bx ; point to the next 'record'F50: cmp al,0 jne F58 mov al,dl ; also the port offset to access mov dx,03d4h ; index register for CRTC out dx,ax ; write to the specified port mov byte ptr [ega_current_crtc+si],ah mov byte ptr [dirty_crtc+si],1 jmp short F5lp2F58: cmp al,8 jne F510 mov al,dl ; also the port offset to access mov dx,03c4h ; index register for Sequencer out dx,ax ; write to the specified port dec si ; RESET is not stored, so index off 1 mov byte ptr [ega_current_seq+si],ah mov byte ptr [dirty_seq+si],1 jmp short F5lp2F510: cmp al,010h jne F518 mov al,dl ; also the port offset to access mov dx,03ceh ; index register for GC out dx,ax ; write to the specified port mov byte ptr [ega_current_graph+si],ah mov byte ptr [dirty_graph+si],1 jmp short F5lp2F518: cmp al,018h jne F520 mov dx,03dah ; clear attribute controller index in al,dx ; the read clears this register lea di,ega_current_attr ; write the application data here mov al,dl ; also the port offset to access mov dx,03c0h ; index register for AC out dx,ax ; write to the specified port mov al,020h ; EGA palette enable out dx,al ; reenable the video mov byte ptr [ega_current_attr+si],ah mov byte ptr [dirty_attr+si],1 jmp short F5lp2F520: cmp al,020h jne F528 mov byte ptr [ega_current_misc],ah mov dx,03c2h ; Miscellaneous output register xchg ah,al out dx,al ; write one byte jmp short F5lp2F528: xchg ah,al mov dx,03dah ; EGA feature register out dx,alF5lp2: dec cx cmp cx,0 jz F5quit jmp F5lpF5quit: popa jmp noint
egaF6: ;--- Restore the EGA default register values -------------------------- pusha push es
; copy the default EGA register sets to the driver's internal cache
mov ax,ds mov es,ax
mov cx,25 lea di,ega_current_crtc lea si,ega_default_crtc rep movsb mov cx,4 lea di,ega_current_seq lea si,ega_default_seq rep movsb mov cx,9 lea di,ega_current_graph lea si,ega_default_graph rep movsb mov cx,20 lea di,ega_current_attr lea si,ega_default_attr rep movsb mov al,[ega_default_misc] mov [ega_current_misc],al
; Set up the Sequencer defaults
mov dx,03c4h ; Sequencer index register mov ax,0100h ; Synchronous reset out dx,ax ; do the work
xor bx,bx ; do the four non reset registers inc al ; point to the next Sequencer registerF6lp1: cmp [dirty_seq+bx],1 ; has the dirty bit been set? jne F6ne1 mov ah,[ega_default_seq+bx] ; default value to send to the register out dx,ax ; do the workF6ne1: inc bx ; point to the next buffer location inc al ; point to the next Sequencer register cmp bx,3 ; copy elements 0->3 to ports jl F6lp1 mov ax,0300h ; Clear synchronous reset out dx,ax ; do the work
; Set up the default Miscellaneous Output Register value.
mov dx,03c2h ; Miscellaneous o/p register address mov al,[ega_default_misc] ; the default value out dx,al ; write to the EGA/VGA
; Set up the Cathode Ray Tube Controller in the default fashion
mov dx,03d4h ; Index to the CRTC xor bx,bx ; clear an index registerF6lp2: cmp [dirty_crtc+bx],1 ; has the dirty bit been set? jne F6ne2 mov ax,bx ; index for the CRTC index register mov ah,[ega_default_crtc+bx] ; default value for the selected reg. out dx,axF6ne2: inc bx ; point to the next location cmp bx,25 ; 25 registers to copy jl F6lp2
; Set up the Attribute Controller default values ; Remember that this is a funny beast which uses a flip-flop ; off just one address/data port
mov dx,03dah ; CRT status register in al,dx ; set the AC flip-flop mov dx,03c0h ; Attibute controller address/data regs xor bx,bx ; clear an index registerF6lp3: cmp [dirty_attr+bx],1 ; has the dirty bit been set? jne F6ne3 mov ax,bx ; index for the CRTC index register mov ah,[ega_default_attr+bx] ; default value for the selected reg. out dx,al ; index the register, then flip the flop xchg al,ah ; get the default data for this register out dx,al ; write the data outF6ne3: inc bx ; point to the next location cmp bx,20 ; 20 registers to copy
; Set the Graphics Controller default values
mov dx,03ceh ; Index to the GC xor bx,bx ; clear an index registerF6lp4: cmp [dirty_graph+bx],1 ; has the dirty bit been set? jne F6ne4 mov ax,bx ; index for the GC index register mov ah,[ega_default_graph+bx] ; default value for the selected reg. out dx,axF6ne4: inc bx ; point to the next location cmp bx,9 ; 9 registers to copy jl F6lp2
; Reenable the video
mov dx,03c0h ; index register for AC mov al,020h ; EGA palette enable out dx,al ; reenable the video
; Clean out the dirty register arrays
xor al,al ; put a nice zero in all the dirty ; registers mov cx,25+4+9+20 ; do the CRTC, SEQ, GC and AC in mov di,offset dirty_crtc ; one go rep stosb
pop es popa jmp noint
egaF7: ;---Define default register table ------------------------------------- pusha push es push ds
; Load a new set of default registers for a particular EGA/VGA component
mov si,bx ; SOURCE of the incoming data from the app mov ax,es ; save the SOURCE segment register mov bx,ds ; save the DESTINATION offset mov ds,ax ; DS is now the SOURCE segment in the app mov es,bx ; ES is now the DESTINATION segment in the dvr
assume ds:nothing, es:SpcMseSeg
F70: ; Set the default CRTC registers
cmp dx,0 jne F78 mov cx,25 ; copy 25 register entries mov di,offset ega_default_crtc rep movsb ; do the copy jmp short F7dirty
F78: ; Set the default Sequencer registers
cmp dx,8 jne F710 mov cx,4 ; copy 4 register entries mov di,offset ega_default_seq rep movsb ; do the copy jmp short F7dirty
F710: ; Set the default Graphic Controller registers
cmp dx,10 jne F718 mov cx,9 ; copy 9 register entries mov di,offset ega_default_graph rep movsb ; do the copy jmp short F7dirty
F718: ; Set the default Attribute Controller registers
cmp dx,18 jne F720 mov cx,20 ; copy 20 register entries mov di,offset ega_default_attr rep movsb ; do the copy jmp short F7dirty
F720: ; Set the default Miscellaneous Output register
cmp dx,20 jne F7quit mov word ptr cs:[ega_default_misc],si
F7dirty:
; Set all the dirty register arrays
mov al,1 ; put a nice one in all the dirty ; registers mov cx,25+4+9+20 ; dirty all the registers in one go mov di,offset dirty_crtc rep stosb
F7quit: pop ds ; need to restore the segment registers pop es
assume ds:SpcMseSeg, es:nothing
popa
jmp noint
egaFA: ;--- Interrogate driver ----------------------------------------------- ; The real Microsoft mouse driver gets this wrong (release 7.03)
push ax mov ax,cs mov es,ax mov bx,offset relnum ; return the address of the mouse ; driver version number pop ax jmp noint
;=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
ENDIF ; MOUSE_VIDEO_BIOS
do_bop:
bop VIDEO_IO_BOP ;BOP BE nop nop jnc nointgo_rom: popf db 0EAh ; this is a far jumpold_vid_int dd ? ; far pointer to the old int 10h vector jmp DOIRETnoint: popf jmp DOIRET
mouse_int1: bop INT1_BOP jmp DOIRET
mouse_version:ifdef DBCS dw 0626helse ; !DBCS dw 04242hendif ; !DBCS dw 0000h
mouse_copyright: db "Windows NT MS-DOS subsystem Mouse Driver"
video_io: int VIDEO bop UNSIMULATE_BOP
mouse_int2: bop INT2_BOP jmp DOIRET
mouseINB: in al,dx bop 0feh
mouseOUTB: out dx,al bop 0feh
mouseOUTW: out dx,ax bop 0feh
;+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++;;16 BIT ENTRY POINT 16 BIT ENTRY POINT 16 BIT ENTRY POINT 16 BIT ENTRY POINT;;+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================; Procedure that provides the driver interface to 32 bit land. This is; the entry point to the Intel 16 bit driver from the mouse interrupt; handler in the host mouse code.;; This procedure determines the current video mode from the BIOS data; area, and depending on this branches to the correct display routines; for this mode.;; N.B. This function MUST NOT modify CX and DX because the next level; of functions in the driver heirarchy requires the values passed in; them from 32 bit land.;========================================================================
assume ds:SpcMseSeg
entry_point_from_32bit proc near make_stack ; use the driver's own stack push ds push ax push bx
mov ax,cs mov ds,ax
call getBIOSvideomode; read the BIOS data area xor bx,bx ; clear the jump table index shl al,1 ; create a table index for word sized entries mov bl,al ; move into a base register call [drawpointerJMPT+bx] ; jump to the correct routine
pop bx pop ax pop ds kill_stack ; return to the previous stack
bop 0FEh ; return to the 32 bit side
entry_point_from_32bit endp
;========================================================================; Procedure to set the cursor draw flag to DO DRAW. This is called from; SoftPC code via a host_simulate(). This routine is called when the; application does an INT 33h, function 1.;; In accordance with the Microsoft Programmer's Reference, the internal; cursor flag (internalCF) has a default value of -1. If intenalCF = 0; then the cursor is drawn. If the flag is already 0, then this function; does nothing.;; Note: with calls to int 33h AX = 2, it is legal to; make internalCF less than -1.;========================================================================
int33function1 proc near
make_stack ; use the driver's own stack push ax push bx push ds
mov ax,cs mov ds,ax;; do not allow mouse int comes in while we are updating the cursor.;; call DOCLI
; check to see if the pointer should be drawn
; cmp [internalCF],0 ; is the flag already zero?; jz fn1quit ; if so, do nothing
; pointer is not ON, so increment the flag to try to turn it ON
; inc [internalCF] ; increment the pointer internal flag; cmp [internalCF],0 ; if 0, then the pointer can be drawn; jl fn1quit ; it is < 0, so don't draw the pointer.
; The internal cursor flag hits zero for the first time, so ; draw the pointer.
call getBIOSvideomode; read the BIOS data area xor bx,bx ; clear the jump table index shl al,1 ; create a table index for word sized entries mov bl,al ; move into a base register call [Int33function1JMPT+bx] ; do the correct function 1 handlerfn1quit:;; call DOSTI pop ds pop bx pop ax kill_stack ; return to the previous stack bop 0FEh ; back to jolly old 32 bit land
int33function1 endp
;========================================================================; Procedure to set the cursor draw flag to DONT DRAW. This is called from; SoftPC code via a host_simulate(). This routine is called when the; application does an INT 33h, function 2;; Note: with calls to int 33h AX = 2, it is legal to; make internalCF less than -1.;========================================================================
int33function2 proc near
make_stack ; use the driver's own stack push ax push bx push ds
mov ax,cs mov ds,ax;; do not allow mouse int comes in while we are updating the cursor.;; call DOCLI
; dec [internalCF] ; decrement the pointer internal flag
; if the internal cursor flag is less than -1, then do not try ; do remove the pointer from the screen because this has already ; been done.
; cmp [internalCF],0ffh; jl fn2quit ; do nothing if < -1
; Internal flag hits -1, so remove the pointer from the screen.
call getBIOSvideomode; read the BIOS data area xor bx,bx ; clear the jump table index shl al,1 ; create a table index for word sized entries mov bl,al ; move into a base register call [Int33function2JMPT+bx] ; do the correct function 1 handlerfn2quit:;; call DOSTI pop ds pop bx pop ax kill_stack ; return to the previous stack
bop 0feh
int33function2 endp
;========================================================================; Procedure to return straight back to cloud 32. This is needed if an; unsupported video mode is found in the BIOS data area.;========================================================================
not_supported proc near ret ; cant't BOP 0feh here or the stack will die ; (out of balance with CS:IP stored from call)not_supported endp
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++;; END 16 BIT ENTRY END 16 BIT ENTRY END 16 BIT ENTRY END 16 BIT ENTRY;;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================; Procedure to draw a cursor on the fullscreen X86 graphics display for; high resolution graphics modes.; This procedure saves the area about to be written over, blts the; pointer image onto the screen and restores the background from whence; cursor has just come.;; Input: CX = x-coordinate; DX = y-coordinate; Output: None;========================================================================
drawHiResPointer proc near
; save the video card's read/write context
;; call DOCLI pusha push ds mov ax,cs ; make sure that DS points to the mov ds,ax ; right segment
call saveVGAregisters call check_for_mode_change
mov bx,cx ; get X coordinate into a base register shl bx,1 ; calculate a word index mov ax,[ChooseImageLUT+bx] ; select the right image LUT mov [PointerLUT],ax ; store the LUT address
xor ax,ax ; assume carry clear after the next call call determineboundary jnc detcont ; pointer in buonds if carry clear not ax ; carry was set, so set AX non zero
detcont:
; Coordinates are now transformed from Cartesian to physical VRAM ; memory byte and bit offsets.
mov di,dx ; store DX for later
; internalCF = the current pointer status ; background = indicates if a background has been stored or not ; ; if(internalCF == Zero && background == STORED) ; The normal cursor ON condition
cmp [internalCF],0 jnz end_the_if ; request to turn pointer on cmp [background],STORED jne end_the_if
mov si,cx mov di,dx mov dx,[VRAMlastbyteoff] mov cx,[VRAMlastbitoff] call restore_background
cmp ax,0 ; should the pointer be drawn? jnz end_the_if ; if the pointer has gone off the edge of ; the screen, then quit
mov [VRAMlastbyteoff],di ; save the current position mov [VRAMlastbitoff],si mov cx,si mov dx,di call save_background mov cx,si mov dx,di call drawEGApointer
end_the_if:
call restoreVGAregisters
pop ds popa;; call DOSTI ret
drawHiResPointer endp
;========================================================================; Procedure to draw a cursor on the fullscreen X86 graphics display.for; medium resolution graphics modes.; This procedure saves the area about to be written over, blts the; pointer image onto the screen and restores the background from whence; cursor has just come.;; Input: CX = x-coordinate; DX = y-coordinate; Output: None;========================================================================
drawMediumResPointer proc near
pusha;; call DOCLI
shr cx,1 ; map from 640 virtual to 320 real
; CX,DX = x,y cartesian coordinates here.
call check_for_mode_change
; internalCF = the current pointer status ; background = indicates if a background has been stored or not ; ; if(internalCF == Zero && background == STORED) ; The normal cursor ON condition
cmp [internalCF],0 jnz cant_draw_ptr ; request to turn pointer on cmp [background],STORED jne cant_draw_ptr mov si, cx ; save new cursor position mov di, dx mov dx,[VRAMlastbyteoff] ; mov cx,[VRAMlastbitoff] mov bp,[LastYCounters] ; Y looping counter call restorebkgrndmode4 mov cx, si ; restore new cursor position mov dx, di call detboundmode4 ; calculate new byte offset jc cant_draw_ptr ; don't draw new cursor of out of scrn
mov [VRAMlastbyteoff], dx ; byte offset mov [VRAMlastbitoff], cx ; MSB = 0FFh if start with ODD line ; LSB = bit offset mov [LastYCounters], bp ; MSB: even counter, LSB for odd call savebkgrndmode4 call drawmode4pointer
cant_draw_ptr:
;; call DOSTI popa ret
drawMediumResPointer endp
;========================================================================; Procedure to draw a cursor on the fullscreen X86 graphics display for; medium resolution, 256 colour graphics mode. (video bios mode 13h).; This procedure saves the area about to be written over, blts the; pointer image onto the screen and restores the background from whence; cursor has just come.;; Input: CX = x-coordinate; DX = y-coordinate; Output: None;========================================================================
drawC256Pointer proc near pusha;; call DOCLI shr cx,1 ; map from 640 virtual to 320 real x
; CX,DX = x,y cartesian coordinates here.
call check_for_mode_change
; internalCF = the current pointer status ; background = indicates if a background has been stored or not ; ; if(internalCF == Zero && background == STORED) ; The normal cursor ON condition
cmp [internalCF],0 jnz cant_draw_256ptr ; request to turn pointer on cmp [background],STORED jne cant_draw_256ptr
mov si,cx mov di,dx mov dx,[VRAMlastbyteoff] mov cx,[LastXCounters] mov bp,[LastYCounters] call restorebkgrndmode13 mov cx, si mov dx, di call detboundmode13 jc cant_draw_256ptr
mov [VRAMlastbyteoff],dx ; save the current position mov [LastXCounters],cx mov [LastYCounters], bp call savebkgrndmode13 call draw256pointer
cant_draw_256ptr:;; call DOSTI popa retdrawC256Pointer endp
;========================================================================; Procedure to draw a pointer on the fullscreen X86 text display for; BIOS modes 3 and 7.; This procedure saves the area about to be written over, XORs the; pointer image onto the screen and restores the background from whence; cursor has just come.;; Input: CX = x-coordinate; DX = y-coordinate; Output: None;========================================================================
IFDEF SIXTEENBIT
drawTextPointer proc near pusha push es
; CX,DX = x,y virtual pixel coordinates here. ; 0 <= x < 640 ; 0 <= y < 200 for 25 line mode ; 0 <= y < 344 for 43 line mode ; 0 <= y < 400 for 50 line mode ; The virtual character size is always 8x8 virtual pixels.
call check_for_mode_change
; internalCF = the current pointer status ; background = indicates if a background has been stored or not ; ; if(internalCF == Zero && background == STORED) ; The normal cursor ON condition
cmp [internalCF],0 jnz cant_draw_text_ptr ; request to turn pointer on cmp [background],STORED jne cant_draw_text_ptr
; Calculate the current cell location as an offset ; into the text buffer segment starting at B800:0 ; Note: The following kinky shifts allow for the fact that the text ; video buffer consists of word elements of the form char:attr. ; So, if a row = 80 characters wide on the screen, it is 160 ; bytes wide in VRAM.
mov bx,dx ; create a word table index shr bx,3 ; virtual char height = 8, but 160 bytes ; per text row, so save some shifts. shl bx,1 ; make a word table index mov di,[mult80lut+bx] ; multiply by 80 words per text row. shl di,1 shr cx,3 ; divide the x virtual pixel coordinate ; by 8 = virtual char width and mult ; by 2 to get word offset in text row. shl cx,1 add di,cx ; full VRAM location now in DI
; Restore the text cell previously overwritten.
mov si,[VRAMlasttextcelloff]; address of last modified text cell mov [VRAMlasttextcelloff],di; store the current cell location
mov ax,0b800h ; the text buffer segment mov es,ax ; ES now points there
; The text pointer uses the same magic as the graphics code ; to place a pointer on the screen.
mov bx,07700h ; the magic cursor mask for pointer mov cx,077ffh ; the magic screen mask for pointer
assume es:nothing
mov ax,[lasttextimage] ; restore the background mov es:[si],ax ; from last time mov ax,es:[di] ; load the cell to be modifyed mov [lasttextimage],ax ; save this cell for next time and ax,cx ; apply the screen mask xor ax,bx ; apply the cursor mask mov es:[di],ax ; and write back
assume es:SpcMseSeg
cant_draw_text_ptr:
pop es popa retdrawTextPointer endp
ENDIF ;; SIXTEENBIT
ifdef DBCS;; video io handler
DBCS_mouse_int10: inc cs:video_io_enter_count pushf call cs:old_vid_int dec cs:video_io_enter_count iret
;; input: cx = mouse cursor X position in screen coordinate;; dx = mouse cursor Y position in screen coordinate
DBCS_drawTextPointer proc near cmp cs:video_io_enter_count, 0 jne video_busy_01
pusha push es push ds mov ax, cs mov ds, ax mov es, ax cmp [background], NOTSTORED je @F call DBCS_erase_cursor@@: call DBCS_save_ac mov [background], STORED call DBCS_draw_new_cursor pop ds pop es popa
video_busy_01: ret
DBCS_drawTextPointer endp
DBCS_erase_cursor proc near push cx push dx mov bx, mouse_cursor_offset mov ax, saved_ac_on_mouse_cursor mov [bx], ax mov dx, saved_ac_cursor_position mov cx, saved_ac_count mov bh, active_page mov bp, saved_ac_offset mov ax, 1320h int 10h pop dx pop cx retDBCS_erase_cursor endp
DBCS_draw_new_cursor proc near push cx push dx mov bx, mouse_cursor_offset mov ax, saved_ac_on_mouse_cursor and ax, 077FFh xor ax, 07700h mov [bx], ax mov bp, saved_ac_offset mov ax, 1320h mov cx, saved_ac_count mov dx, saved_ac_cursor_position mov bh, active_page int 10h pop dx pop cx retDBCS_draw_new_cursor endp
;; input: cx = mouse X virtual screen coordinate;; dx = mouse Y virtual screen coordinate;; this function assumes that DS and ES are set to CSDBCS_save_ac proc near push cx push dx push es SCREENtoCHARCELL ;screen coord to cell coord mov saved_ac_cursor_position, dx ;the cell coord where the ; mouse cursor stay mov cl, dl ; inc cl ;read ac pairs from the ;beginning of the line inc cl xor ch, ch mov dl, ch mov bp, offset line_buffer mov bh, active_page;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; xor bl, bl;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; mov ax, 1310h int 10h dec cx mov si, bp les di, dbcs_vector mov bp, di mov dl, 3 ;dl = char code type ;3->SBCS, 4->DBCS 1st ;5->DBCS 2nd cld
MBCS_parsing_loop: lodsb ;get next char code inc si ;place ptr to next one cmp dl, 4 ;previous code a DBCS 1st? je DBCS_ac ;yes, count this one the 2nd
mov dl, 3 ;reset to SBCS
DBCS_lead_byte_loop: mov bx, es:[di] ;get next dbcs lead byte pair or bx, bx ;done with the table? je parse_next_ac ;yes, try next ac
inc di ;advance the dbcs table index inc di cmp al, bl ;is the char code a DBCS 1st? jb DBCS_lead_byte_loop ; cmp al, bh ja DBCS_lead_byte_loopDBCS_ac: inc dl ;either DBCS 1st or DBCS 2nd
parse_next_ac: mov di, bp ;reset DBCS vector loop MBCS_parsing_loop dec si ; dec si mov ax, [si] ;the ac we want to save mov saved_ac_on_mouse_cursor, ax mov mouse_cursor_offset, si ;and so is the offset in the buffer cmp dl, 5 ;if the ac on the mouse cursor position ;is a DBCS 2nd, we backward the ;pointer jne @F ;backward one ac dec si dec si dec saved_ac_cursor_position ;and adjust the cursor position@@: mov saved_ac_offset, si ; shr dl, 1 xor dh, dh mov saved_ac_count, dx pop es pop dx pop cx ret
DBCS_save_ac endpendif ; DBCS;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++;; Interrupt 33h support functions.; These functions are called via a jump table from the 16 bit entry; point code.;;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================; Procedure to set the cursor draw flag to DO DRAW. This is called from; SoftPC code via a host_simulate(). This routine is called when the; application does an INT 33h, function 1;========================================================================
int33function0 proc near
make_stack ; use the driver's own stack push ds push es pusha
; sort out the segments
mov ax,cs mov ds,ax mov ax,cs mov es,ax;; do not allow mouse int comes in while we are updating the cursor.;; call DOCLI ; set the internal pointer flag to its default value.
mov [internalCF],0ffh
; set the default hotspot location = (0,0)
xor ax,ax mov [hotspot],ax mov [hotspot+2],ax
; copy the default pointer to the working pointer buffer
lea si,default_cursor lea di,current_cursor call copy_pointer_to_current
; clear the pointer enabled flag, turn the pointer off by restoring ; the background.
mov [background],NOTSTORED ; there is no stored background now
;; call DOSTI popa pop es pop ds kill_stack ; restore the previous stack bop 0FEh
int33function0 endp
;========================================================================; Procedure to accept a cursor bit image from the current application; at ES:DX. This is stored as the current pointer image for use by; the driver.;========================================================================
assume es:nothing
int33function9 proc near call DOCLI make_stack ; use the driver's own stack push ds push es pusha
mov ax,cs ; point at the driver data segment mov ds,ax;; do not allow mouse int comes in while we are updating the cursor.;; call DOCLI ; Read in the hotspot cartesian coordinate values for the ; new pointer image. If the hotspot values are out of range ; i.e. >127 | < -128, then reset to the boundary value ; Now using kinky non modRM short forms by clever use of AX
mov ax,127 ; load accumulator with 127 mov bp,ax ; store this constant in a register cmp ax,bx ; compare X value of hotspot with 127 jg test_low_x ; if 127 > BX, BX is within upper limit xchg ax,bx ; BX > 127, so set to 127 jmp short check_y_hotspot ; now test the Y values
test_low_x:
not ax ; change accumulator from 127 to -128 cmp ax,bx ; compare X value of hotspot with -128 jl check_y_hotspot ; if -128 < BX, BX is within lower lim. xchg ax,bx ; BX < -128, so set it to -128
check_y_hotspot:
mov ax,bp ; reload AX with 127 cmp ax,cx ; compare Y value of hotspot with 127 jg test_low_y ; if 127 > CX, Cx is within upper limit xchg ax,cx ; CX > 127, so set CX to 127 jmp short done_hotspot_check; both hotspot coords tested, so save
test_low_y:
not ax ; change accumulator from 127 to -128 cmp ax,cx ; compare Y value of hotspot with -128 jl done_hotspot_check ; if -128 < CX, CX is within lower lim. xchg ax,cx ; CX < -128, so set it to -128
done_hotspot_check:
mov [hotspot],bx ; save the hotspot x,y mov [hotspot+2],cx ; y component of the hotspot
; DESTINATION: the driver current pointer buffer ; Note: the SOURCE is already being pointed at by DX
lea di,current_cursor ; this is the bit that must change mov si,dx
; copy in the new application pointer
mov ax,es mov ds,ax ; DS now points to where ES points mov ax,cs mov ax,es ; ES points to our data area now call copy_pointer_to_current ; Copy the pointer image appropriately
popa pop es pop ds kill_stack ; restore the previous stack call DOSTI ret ; this code is called from within this ; 16 bit driver, so don't BOPint33function9 endp
;============================================================================; Procedure to display the pointer image in HIRES graphics modes;============================================================================
HiResInt33Function1 proc near
pusha call check_for_mode_change call saveVGAregisters mov cx,[current_position_x] ; get the last known cursor position mov dx,[current_position_y] ; from the OS via the event loop call determineboundary ; convert to VRAM coordinates jc end_function1 ; if the pointer has gone off the edge ; of the screen, then quit mov [VRAMlastbyteoff],dx ; save the restore background location mov [VRAMlastbitoff],cx mov si,cx mov di,dx call save_background mov cx,si mov dx,di call drawEGApointer mov [background],STOREDend_function1: call restoreVGAregisters popa ret ; return to driver surface manager code
HiResInt33Function1 endp
;============================================================================; Procedure to display the pointer image in MEDIUMRES graphics modes; Note that this function does a conversion from virtual pixel coordinates; to real screen coordinates as required if the stored values in the; current_position memory locations are greater than 320 for X or 200; for Y.;============================================================================
MediumResInt33Function1 proc near
pusha call check_for_mode_change mov cx,[current_position_x] ; get the last known cursor position mov dx,[current_position_y] ; from the OS via the event loop shr cx,1 ; virtual coor -> screen coor call detboundmode4 ; convert to VRAM coordinates jc MediumResFunction1_exit
mov [VRAMlastbyteoff],dx ; save the restore background location mov [VRAMlastbitoff],cx mov [LastYCounters], bp call savebkgrndmode4 call drawmode4pointer mov [background],STORED
MediumResFunction1_exit: popa ret
MediumResInt33Function1 endp
;============================================================================; Procedure to display the pointer image in VGA 256 colour graphics modes;============================================================================
C256Int33Function1 proc near pusha call check_for_mode_change call modifyentry255 ; make sure that DAC entry 255 is white mov cx,[current_position_x] ; get the last known cursor position mov dx,[current_position_y] shr cx, 1 ; virtual coor -> screen coord call detboundmode13 ; convert to VRAM coordinates jc C256Function1_exit
mov [VRAMlastbyteoff],dx ; save the restore background location mov [LastXCounters],cx ; X loop counter mov [LastYCounters], bp ; Y loop counter call savebkgrndmode13 call draw256pointer mov [background],STORED
C256Function1_exit: popa ret ; return to driver surface manager code
C256Int33Function1 endp
;============================================================================; Procedure to show the TEXT pointer;============================================================================IFDEF SIXTEENBIT
TextInt33Function1 proc near
pusha push es
mov [background],STORED call check_for_mode_change
mov cx,[current_position_x] ; get the last known cursor position mov bx,[current_position_y] ; from the OS via the event loop
shr bx,3 ; virtual char height = 8, but 160 bytes ; per text row. shl bx,1 ; make a word table index mov di,[mult80lut+bx] ; multiply by 80 words per text row. shl di,1 ; remember 160 bytes NOT 80 in a row shr cx,3 ; divide the x virtual pixel coordinate ; by 8 = virtual char width and mult ; by 2 to get word offset in text row. shl cx,1 add di,cx ; full VRAM location now in DI
mov [VRAMlasttextcelloff],di; store the current cell location
mov ax,0b800h ; the text buffer segment mov es,ax ; DS now points there
mov bx,07700h ; the magic cursor mask for pointer mov cx,077ffh ; the magic screen mask for pointer
assume es:nothing
mov ax,es:[di] ; load the cell to be modifyed mov [lasttextimage],ax ; save this cell for next time and ax,cx ; apply the screen mask xor ax,bx ; apply the cursor mask mov es:[di],ax ; and write back
assume es:SpcMseSeg
pop es popa ret ; return to driver surface manager code
TextInt33Function1 endp
ENDIF ;; SIXTEENBIT
ifdef DBCSDBCS_TextInt33Function1 proc near cmp cs:video_io_enter_count, 0 jne video_busy_02 pusha push es push ds mov ax, cs mov es, ax mov ds, ax mov cx, [current_position_x] mov dx, [current_position_y] call DBCS_save_ac mov [background], STORED call DBCS_draw_new_cursor pop ds pop es popavideo_busy_02: ret
DBCS_TextInt33Function1 endpendif ; DBCS;============================================================================; Procedure to remove the pointer image in HIRES graphics modes;============================================================================
HiResInt33Function2 proc near
push cx push dx
call saveVGAregisters call check_for_mode_change
cmp [background],STORED ; is there some stored background? jne no_background_stored ; no, so don't restore it mov dx,[VRAMlastbyteoff] mov cx,[VRAMlastbitoff] call restore_background ; restored the background at correct mov [background],NOTSTORED ; place. Set buffer cleared Flag
no_background_stored:
call restoreVGAregisters
pop dx pop cx ret
HiResInt33Function2 endp
;============================================================================; Procedure to remove the pointer image in MEDIUMRES graphics modes;============================================================================
MediumResInt33Function2 proc near push cx push dx push bp call check_for_mode_change
cmp [background],STORED ; is there some stored background? jne nobkgrndstored ; no, so don't restore it mov dx,[VRAMlastbyteoff] cmp dx,80*100 ; mustn't be greater than buffer size jl vidoffok ; it's OK, so do nothing mov dx,80*10-1 ; modify DX to fit in the buffervidoffok: mov cx,[VRAMlastbitoff] ; CL = bit offset ; CH = odd/even flag and cl,3 ; cannot be greater than bit 3( 2bits/p) mov bp, [LastYCounters] call restorebkgrndmode4 ; restored the background at correct mov [background],NOTSTORED ; place. Set buffer cleared Flag
nobkgrndstored: pop bp pop dx pop cx retMediumResInt33Function2 endp
;============================================================================; Procedure to remove the pointer image in MEDIUMRES graphics modes;============================================================================
C256Int33Function2 proc near push cx push dx push bp call check_for_mode_change
cmp [background],STORED ; is there some stored background? jne nobkgrndstored256 ; no, so don't restore it mov dx,[VRAMlastbyteoff] mov cx,[LastXCounters] mov bp,[LastYCounters] call restorebkgrndmode13 ; restored the background at correct mov [background],NOTSTORED ; place. Set buffer cleared Flagnobkgrndstored256:
pop bp pop dx pop cx ret
C256Int33Function2 endp
;============================================================================; Procedure to remove the pointer image in TEXT modes;============================================================================
IFDEF SIXTEENBIT
TextInt33Function2 proc near
push ax push si push es
call check_for_mode_change
cmp [background],STORED ; is there some stored background? jne no_text_background_stored ; no, so don't restore it
mov [background],NOTSTORED ; place. Set buffer cleared Flag
; Restore the text cell previously overwritten.
mov si,[VRAMlasttextcelloff]; address of last modified text cell
mov ax,0b800h ; the text buffer segment mov es,ax ; DS now points there
assume es:nothing
mov ax,[lasttextimage] ; restore the background mov es:[si],ax ; from last time
no_text_background_stored:
assume es:SpcMseSeg
pop es pop si pop ax ret
TextInt33Function2 endp
ENDIF ;; SIXTEENBIT
ifdef DBCSDBCS_TextInt33Function2 proc near cmp cs:video_io_enter_count, 0 jne video_busy_03 cmp cs:[background], NOTSTORED je DBCS_TextInt33Function2_exit pusha push es push ds mov ax, cs mov ds, ax mov es, ax call DBCS_erase_cursor mov [background], NOTSTORED pop ds pop es popavideo_busy_03:DBCS_TextInt33Function2_exit: retDBCS_TextInt33Function2 endpendif ; DBCS;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++;; End of Interrupt 33h support functions.;;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++;; Mouse driver general support functions;;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================; Procedure to determine if the application has changed video modes since; the last mouse interrupt. If it has, then the image that is saved in the; background restore buffer is invalid and should not be drawn.;========================================================================
check_for_mode_change proc near
push ax
call getBIOSvideomode; peek at the BIOS data area for video mode cmp al,[lastvidmode]; compare with the last mode value ; from the preceding interrupt jnz mode_change ; a mode change has occurred pop ax ; no mode change, so quit retmode_change: mov [background],NOTSTORED mov byte ptr [lastvidmode],al ; store the new mode pop ax
retcheck_for_mode_change endp
;========================================================================; Procedure to read the BIOS data area and get the current video mode; Output: AL = BIOS video mode; Modifies: memory variable -> currentvidmode, puts the video found in; the BIOS data area in this memory location.;========================================================================
getBIOSvideomode proc near
push es push bxifdef DBCS mov bx, dbcs_vector_seg or bx, bx je got_dbcs_state mov es, bx mov bx, dbcs_vector_off mov bh, es:[bx]got_dbcs_state:endif ; DBCS mov ax,40h ; BIOS data area segment mov es,axifdef DBCS mov al,es:[62h]; ; get current page number mov active_page, alendif ; DBCS
mov al,es:[49h] ; get the BIOS video mode data
mov bl,al ; copy the video mode valueifdef DBCS cmp bh, 0 je got_mode_number mov al, DBCS_GRAPHIC_MODE_NUMBER cmp bl, 72h je got_mode_number mov al, DBCS_TEXT_MODE_NUMBERgot_mode_number: mov bl, alendif ; DBCS xor bh,bh shl bx,1 ; create a word table index mov bx,[latchhomeLUT+bx] ; get the latch hiding place for this ; video mode mov [latchcache],bx ; save in memory for use in save and restore ; vga registers.
pop bx pop es ; restore the 'normal' data segment ret
getBIOSvideomode endp
;=========================================================================; Function to modify the 256th palette entry for 256 colour mode. The; driver requires white to be set in this DAC register triple.;=========================================================================modifyentry255 proc near push ax push dx mov dx,03c8h mov al,0ffh out dx,al inc dx out dx,al out dx,al out dx,al pop dx pop ax retmodifyentry255 endp
;========================================================================; Procedure to copy the required pointer image to the snapshot; buffers. Each buffer holds a different instance of the mouse; pointer for each possible alignment of the pointer image in; a VRAM byte.;; INPUT DS:SI = pointer to the source image;;========================================================================
assume ds:nothing
copy_pointer_to_current proc near
push ds push es pusha
; Set up the destination for the copy
mov ax,cs ; point ES to this segment mov es,ax lea di,current_cursor ; this is the bit that must change mov bx,di ; save this address for a while mov bp,si ; save the application source address
; Fill the AND buffer with 1s and then fill the XOR buffer with ; 0s for the byte aligned pointer condition. This is done so that ; the last byte in the 3byte scanline sequence is set to the correct ; value to prevent image loss from the screen.
cld ; move low mem -> high mem mov ax,24 ; avoid doing a modRM load of immediate mov cx,ax ; 24 words to fill. mov dx,ax ; store this for a while xor ax,ax ; clear AX (AX = 0) not ax ; AX = 0ffffh -> fill AND mask with it. rep stosw ; fill the screen mask (AND mask) mov cx,dx ; do the next 24 words (XOR mask) not ax ; AX = 0h -> fill XOR mask with it rep stosw ; Fill the cursor mask
; Now fill the prepared 48 word buffer with the user defined ; AND and XOR masks ; Note that the image passed in from the application is little-endian. ; To write to the VGA planes byte by byte, the image has to be reversed ; to big-endian for the purpose of quick drawing since the VGA can only ; read and write one byte from/to its latches.
mov di,bx ; point to the top of the buffer again mov si,bp ; point to the new pointer image
mov cx,32norept1: lodsw ; read in the required image word xchg al,ah ; convert little endian to big endian stosw ; write into local buffer inc di ; remember local buffer in 3 bytes wide dec cx jnz norept1
; Now, the aligned mask must be rotated, then copied into each of ; the seven unaligned image buffers.
mov ax,cs mov ds,ax ; return to the default data segment
mov bp,1000000000000000b ; a mask for the MSBit
lea di,AlignData1 ; point to the buffer for 1 bit offset mov si,bx ; source = byte aligned pointer image
push bx mov bx,32*7norept2: lodsw ; load the word from 3 byte sequence xchg al,ah ; put into little-endian format mov cl,byte ptr [si] ; load the remaining byte shr ax,1 ; LSB now stored in CF rcr cl,1 ; CF into MSB, lsb into CF jnc $+4 ; CF=0 -> don't need to do anything or ax,bp ; OR in the carried bit from CF xchg al,ah ; return to bitstream format stosw ; write the rotated data mov byte ptr[di],cl inc si ; point to the next source scanline inc di ; point to the next dest scanline
dec bx jnz norept2 pop bx
; Just to do a little bit more work, the rotated buffers created ; above must be copied to the instances for byte 78 and byte 79 ; of the scanline. These images are then cunningly clipped in the ; process to the edge of the screen!
mov si,bx ; BX points to the top of current buffer ; Note DI points to clip_cursor78 now
; may as well use the nice string functions now that I don't ; have to XCHG bytes. (how space and cycle efficient
xor al,al ; constant for putting in masks
; there are 8 instances for bits 0 to 7
mov bx,8norept3:
; Do the AND mask modifications for byte 78
not al ; AL = 11111111b REPT 16 ; 16 scanlines movsw ; copy contents of AND word stosb ; Nice clear AND mask = 11111111b inc si ; point to the first image byte in ; the next scanline ENDM
; Do the XOR mask modifications for byte 78
not al ; AL = 00000000b REPT 16 ; 16 scanlines movsw ; copy contents of XOR word stosb ; Nice clear XOR mask = 00000000b inc si ; point to the first image byte in ; the next scanline ENDM
dec bx jnz norept3
; prepare the BYTE 79 instances ; SI and DI should be in the right place
xor ax,ax ; constant for putting in masks mov bx,2 ; constant for addressing source
; there are 8 instances for bits 0 to 7
mov cx,8norept4:
; Do the AND mask modifications for byte 79
not ax ; AX = 0ffffh REPT 16 ; 16 scanlines movsb ; copy contents of AND byte stosw ; Nice clear AND mask (=0ffffh) add si,bx ; point to the first image byte in ; the next scanline ENDM
; Do the XOR mask modifications for byte 79
not ax ; AX = 0h REPT 16 ; 16 scanlines movsb ; copy contents of XOR byte stosw ; Nice clear XOR mask add si,bx ; point to the first image byte in ; the next scanline ENDM
dec cx jz norept4quit jmp norept4norept4quit: popa pop es pop ds
retcopy_pointer_to_current endp
;========================================================================; Procedure to determine the segment of the video buffer for; the current display mode.;========================================================================
assume ds:SpcMseSeg
getvideobuffer proc near
push ax push si
; determine the current video mode from the BIOS and save it. ; Use this value to determine the video buffer segment address.
mov ah,0fh ; use the bios to get the video mode int 10h cbw ; create a table index shl ax,1 ; word sized table entries mov si,ax mov ax,[videomodetable+si] ; use video mode to index the table mov [videobufferseg],ax
pop si pop ax ret
getvideobuffer endp
IFDEF DEBUGMOUSE
;=========================================================================; Code to provide 32 bit side with a dump of the VGA registers on request.;=========================================================================
VGAregs db 9+5+25 dup(?) ; enough room for sequencer, GC and CTRC
dumpVGAregs proc near
call DOCLI pusha push ds
mov ax,cs mov ds,ax
assume ds:SpcMseSeg
; Save the Graphics Controller registers
xor bx,bx ; Index into the G.C. register saving array mov dx,03ceh ; Graphics Controller index register xor ax,ax
mov cx,9 ; save 9 G.C. registersnorept5: mov al,ah out dx,al ; Select it inc dx ; Address the register in al,dx ; Get the register contents mov [VGAregs+bx],al ; Save the register inc bx ; index to next array entry inc ah dec dx ; Sequencer index register dec cx jnz norept5
; Save the Sequencer registers
mov dx,03c4h ; Sequencer index register xor ax,ax
mov cx,5 ; save 5 sequencer registersnorept6: mov al,ah out dx,al ; Select it inc dx ; Address the register in al,dx ; Get the register contents mov [VGAregs+bx],al ; Save the register inc bx ; index to next array entry inc ah dec dx ; Sequencer index register dec cx jnz norept6
; Save the CRTC registers
mov dx,03d4h ; CRTC index register xor ax,ax
mov cx,25 ; save 25 sequencer registersnorept7: mov al,ah out dx,al ; Select it inc dx ; Address the register in al,dx ; Get the register contents mov [VGAregs+bx],al ; Save the register inc bx ; index to next array entry inc ah dec dx ; CRTC index register dec cx jnz norept7
pop ds popa call DOSTI bop 0feh ; return to 32 bit land
dumpVGAregs endp
ENDIF ; DEBUGMOUSE
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++;; End of Mouse driver general support functions;;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================; Procedure to draw an EGA pointer image on the graphics screen at a; specified bit location.;; Input: CX = pointer offset in the current VRAM byte.; DX = offset in the video buffer to pointer; Output: None; Modifies: AX,BX,CX,DX,BP,SI,DI;========================================================================
assume ds:SpcMseSeg.286even
drawEGApointer proc near
push es push ds
mov ax,cs mov ds,ax
cld ; index from low memory to high for LODSB
; point to the video buffer
mov ax,0a000h mov es,ax mov bp,dx ; save the byte offset in VRAM for the XOR code
; Select the Graphics Controller
mov dx,03ceh
;************ AND MASK OPERATION **************************
; use the bit position to select the relavent pointer image
shl cx,1 ; need a word offset into LUT mov di,cx ; need an index register mov bx,[PointerLUT] mov si,[bx+di] ; Point to the screen (AND) mask mov di,bp ; point to the byte offset in VRAM mov ax,0803h ; Index the data rotate register and select AND out dx,ax ; do it mov ax,80-2 ; Avoid modRM loading of CX mov cx,ax ; A constant handily kept in a register
; The pointer contains 16 words of information push bx mov bx,16norept8:
lodsw ; Load 2 bytes from the AND mask into AL and AH xchg al,es:[di] ; Latch the 8 pixels for updating. ; and write them back out with new data inc di ; point to the next byte in VRAM
xchg ah,es:[di] ; Latch the 8 pixels for updating. ; and write them back out with new data inc di ; point to the next byte in VRAM
lodsb ; Load a byte from the AND mask into AL xchg al,es:[di] ; Latch the 8 pixels for updating. ; and write them back out with new data add di,cx ; point to the next byte in VRAM on the next scan ; line to write to. CX contains 80-2
dec bx jnz norept8 pop bx
;************ XOR MASK OPERATION **************************
; Note: SI points to current_cursor+48 now, automatically ; i.e. at the start of the XOR mask.
mov di,bp ; point to the byte offset in VRAM mov ax,1803h ; Index the DATA ROTATE REGISTER and ; Select the XOR function to XOR CPU data in out dx,ax ; Do the deed
push bx mov bx,16norept9:
lodsw ; Load 2 bytes from the AND mask into AL and AH xchg al,es:[di] ; Latch the 8 pixels for updating. ; and write them back out with new data inc di ; point to the next byte in VRAM
xchg ah,es:[di] ; Latch the 8 pixels for updating. ; and write them back out with new data inc di ; point to the next byte in VRAM
lodsb ; Load a byte from the XOR mask into AL xchg al,es:[di] ; Latch the 8 pixels for updating. ; and write them back out with new data add di,cx ; point to the next byte in VRAM on the next scan ; line to write to. CX contains 80-2 dec bx jnz norept9 pop bx
pop ds pop es ret
drawEGApointer endp
;========================================================================; Procedure to determine what the byte and bit offset is, in the current; VGA buffer for the top left hand corner of the pointer bitmap.; The X,Y value is modified for hotspot in this routine. A flag is set,; also, to relay whether or not the cursor bitmap is byte aligned or not.;; INPUT: CX,DX = pointer x,y coordinates; OUT : DX = byte offset to top left hand pointer pixel; CX = bit offset in the byte; CF = set if it is not possible to draw the pointer on the; screen because of the hotspot adjustment. (Usually a; negative hotspot value will cause clipping and wrapping; problems at the right and bottom screen boundaries.;========================================================================
determineboundary proc near
push ax push bx push es
; do the adjustment in x,y for pointer hotspot ; Also test for top or left screen boundary problems ; and zero the coordinate if it goes negative.
sub cx,[hotspot] ; adjust the x cartesian coord for hotspot jns dont_zero_x ; if x goes negative, assume zero xor cx,cxdont_zero_x: sub dx,[hotspot+2] ; adjust the y cartesian coord for the hotspot jns dont_zero_y ; if y goes negative, assume zero xor dx,dxdont_zero_y:
; Now check the right and bottom bounds to prevent the pointer ; image wrapping if the hotspot adjustment forces either of ; the coordinates to exceed the screen bounds. ; First, for all video modes that this function handles, the ; X bound is always x < 640 ... check this first.
cmp cx,640 jl didntexceedX stc ; Oh oh - failed, so set carry flag. jmp short quitdet ; bye bye.
didntexceedX:
; Now check out the y value by finding the maximum extent from ; a lut based on the current BIOS video mode.
mov ax,40h ; B.D.A. segment mov es,ax ; and ES points to it. mov al,byte ptr es:[49h] sub al,0fh ; table is normalized. mode f is in entry ; zero. xor ah,ah ; create a look up table index shl ax,1 ; for a table with word sized elements. xchg bx,ax ; use a suitable register as index
cmp dx,[hiresylut+bx] ; get the extent and compare y coord. jl didntexceedY stc ; Oh oh - failed, so set carry flag. jmp short quitdet ; bye bye.
didntexceedY:
; determine the byte offset from the start of the video buffer ; for the modified coordinates. First calculate how many bytes ; there are for the number of scanlines -1 to where the pointer ; is.
mov ax,dx ; copy Y position into AX shl ax,1 ; create a word table index xchg ax,bx ; copy table index into a base register mov dx,[mult80lut+bx] ; do a fast LUT multiply by 80
; determine the byte position of the pixel in question
mov ax,cx ; save the x-coordinate displacement and ax,7 ; do a modulus 8 to find the pixel position ; in the byte. The bit number is in DX.
; add the whole number of bytes in the current row to the number ; of complete-row bytes
shr cx,3 ; divide pixels by 8 to get bytes add dx,cx ; DX hold the complete byte offset. xchg ax,cx ; CX = bit offset in the byte.
; the pointer has not exceeded the screen buonds, so clear ; the carry flag to signify this.
clc
; Wind up the routine and return with the carry flag: ; SET if cursor exceeded screen bounds. ; CLEAR otherwise.quitdet:
pop es pop bx pop ax ret
determineboundary endp
;========================================================================; Procedure to buffer up the data over which the cursor will next be; drawn. This data will be used to replace the cursor at a later point; when the cursor position has changed and for generating a cursor image; To prevent having separate routines for aligned and unaligned pointer; saves, this routine saves a pixel block 24 x 16 deep in all cases. The; start offset is a byte location into VRAM in which the pointer TLHC lives.;; Input: DX = VRAM byte; Modifies: AX,BX,DI,CX,DX,ES;;========================================================================
assume ds:SpcMseSeg
even
save_background proc near
push ds push es pusha
mov ax,cs ; point DS briefly at the driver data mov ds,ax mov es,ax ; point ES to the driver segment
lea di,behindcursor ; DESTINATION: a nice, safe place in the ; driver segment mov ax,0a000h ; point DS at VRAM mov ds,ax
assume ds:nothing
mov bp,dx ; save DX=VRAM byte offset for later use mov dx,03ceh ; VGA GC index register mov al,4 ; select the read map select reg out dx,al ; Index in the map select register inc dx ; DX holds port address to map select register xor al,al ; plane 0 will be selected first
cld ; make sure to address forward in memory mov ah,3 ; number of bytes to copy per pointer scanline xor cx,cx ; counter for the REP MOVSB mov bx,80-3 ; another handy constant: move to next scanline ; byte.
REPT 4 ; read the 4 EGA planes individually
mov si,bp ; SOURCE: somewhere in VRAM out dx,al ; do the plane selection inc al ; select the next plane to latch
; note that only one byte at a time may be read from the latches
; do 16 scanlines for each plane push dx mov dx,16@@: mov cl,ah ; CX now contains 3 rep movsb ; copy 3 bytes from VRAM to data segment add si,bx ; move down to the first byte in next scanline dec dx jnz @B ; norept10 pop dx
ENDM
popa pop es pop ds
ret
save_background endp
;========================================================================; Procedure to restore the area of the screen that was behind the cursor; before it had moved.;; Note. Currently (2/12/92) this is the only routine that modifies the; VGA sequencer. Therefore, the code from save and restore vga registers; that maintain the sequencer registers has been moved to here for; centralisation purposes.;; Input: DX = VRAM byte; Output: None; Modifies: AX,BX,CX,DX,DI,SI;========================================================================assume ds:SpcMseSeg
even
restore_background proc near push ds push es pusha
;; call DOCLI ; turn off interrupts mov ax,cs mov ds,ax ; point at the driver data segment mov ax,0a000h ; videobufferseg mov es,ax ; point ES at VRAM segment mov bp,dx ; save the pointer for later mov si,offset behindcursor ; SOURCE: point at the stored planes
; set up the Graphic Controller for the restore.
mov dx,03ceh ; VGA GC index register mov ax,0003h ; Select copy into latches function out dx,ax ; i.e. data rotate -> replace mov ax,0ff08h ; bitmask register reset out dx,ax
; do the 4 plane restore.
mov cx,80-2 ; point to the first byte in image on next line cld ; write forward in memory mov bx,0102h ; BH = initial plane mask value ; plane 0 is selected with a 1 ; BL = map mask register offset mov dx,03c4h ; index register for sequencer
mov al,bl ; point to the map mask register in sequencer out dx,al ; index the register into 03c5h inc dx ; point to the data register in al,dx ; read the data register value in dec dx ; restore DX to 03c4h mov [seqregs],al ; save the map mask register value
REPT 4 ; 4 planes to restore
mov di,bp ; DESTINATION: pointer into VRAM mov ax,bx ; select the plane to mask and map mask register out dx,ax ; do the mask shl bh,1 ; point to the mask for the next iteration
push dx mov dx,16@@:
lodsw ; load the old background data (ONE WORD) xchg al,es:[di] ; latch the VRAM data and swap with the inc di ; point to next byte to replace xchg ah,es:[di] ; latch the VRAM data and swap with the inc di ; point to next byte to replace lodsb ; load the old background data (ONE BYTE) xchg al,es:[di] ; latch the VRAM data and swap with the add di,cx ; point to the first byte in image on next line
dec dx jnz @B ; norept11 pop dx
ENDM
mov ah,[seqregs] ; the old map mask value mov al,bl ; need to restore the map mask register out dx,ax ; do the restore;; call DOSTI ; reenable interrupts. popa pop es pop ds retrestore_background endp
;==========================================================================; Procedure to save the register state of the VGA card on receiving a; mouse pointer update interrupt. This procedure also sets up the following; VGA registers to nice values for the driver.;; mode register <write mode 0, read mode 0>; data rotate register <do not rotate, no logical ops>; enable set/reset register <disable set/reset>;;==========================================================================
evenassume ds:SpcMseSeg
saveVGAregisters proc near
push dx push di push es
; Save the Graphics Controller registers that the ; Driver uses
xor bx,bx ; Index into the G.C. register saving array mov dx,03ceh ; Graphics Controller index register xor al,al
push cx mov cx,9 ; save 9 G.C. registersnorept12: out dx,al ; Select it inc dx ; Address the register in al,dx ; Get the register contents mov [GCregs+bx],al ; Save the register inc bx ; index to next array entry mov al,bl dec dx ; G.C. index register dec cx jnz norept12 pop cx
; save the latches to location in a bit of video buffer ; off the screen.
mov ax,0a000h ; point to the video buffer mov es,ax
assume es:nothing
mov ax,0105h ; select write mode 1 to squirt latches out out dx,ax ; do the selection mov di,[latchcache] ; 1 byte over the last location mov es:[di],al ; write the latches out to the planes
; disable the enable set/reset register
mov ax,01h ; select enable set/reset register and clear it out dx,ax
; clear the data rotate register (no logical operations).
inc ax inc ax ; select data rotate register and clear it out dx,ax ; AX = 3 therefore points to the DRR
; set write mode 0 for the graphics display ; conveniently, this also sets read mode to 0 which is needed too!
inc ax inc ax ; select write mode 0 out dx,ax ; AX = 5, i.e. the mode register
; color don't care. don't care for all planes inc ax ;register 7, color don't care inc ax out dx, ax ; bit mask register. enable all planes ; inc ax ;register 8, bit mask not ah out dx, ax pop es pop di pop dx ret
saveVGAregisters endp
;==========================================================================; Procedure to restore the register state of the VGA card after dealing; with mouse pointer update interrupt.;==========================================================================
restoreVGAregisters proc near
assume ds:SpcMseSeg
push es push di push bx
; restore the latches that where saved in the video planes
mov ax,0a000h ; point to the video buffer mov es,ax
assume es:nothing
mov di,[latchcache] ; the byte just off the end of the buffer mov al,es:[di] ; read in the latches
; Restore the Graphics Controller registers that the ; Driver uses
xor ax,ax ; create an index xor bx,bx ; Index into the G.C. register saving array mov dx,03ceh ; Graphics Controller index register
norept13: mov ah,[GCregs+bx] ; restore the register out dx,ax ; Select it inc al ; index for the next register inc bx ; index to next array entry cmp al,9 jne norept13
pop bx pop di pop es ret
restoreVGAregisters endp
;=======================================================================; Procedure to draw a BIOS Mode 4 graphics pointer to the display.; Input: DX = byte offset; CL = bit offset in the byte; CH = 0FFh if ODD, 0 if EVEN; BP = Y loop counter, ODD in LSB, EVEN in MSB;=======================================================================drawmode4pointer proc near
pusha push es cld
xchg dx, bp ; mov di, bp ; bp = di = byte offset, dx = y counters mov ax,0b800h ; point a segment register to mov es,ax ; the CGA video buffer. or ch, ch ; je drawonevenscanline ; jmp drawonoddscanline ; otherwise do an ODD job
; ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN
drawonevenscanline:
mov si,[mode4SelectedPointer] ; Load a word of the pointer image, convert it to two bits per ; pixel and write to the screen for even scanlines
xor cx, cx mov cl, dh ; number of even scanlines to draw push dxevensl1: mov dx,3norept14: lodsb ; load 8 pixels from pointer bitmap xor bh,bh ; want a zero extended 16 bit value mov bl,al ; copy into a base register shl bx,1 ; create a word address mov ax,[LUT1to2bit+bx] ; get the byte to word conversion xchg al,ah ; little-endianise mov bx,es:[di] ; get the current displayed 8 pixels and ax,bx ; AND the AND mask in stosw ; write to the video buffer dec dx jnz norept14
add si,3 add di,80-6 loop evensl1 pop dx
; Load a word of the pointer image, convert it to two bits per ; pixel and write to the screen for odd scanlines
mov si,[mode4SelectedPointer] add si,3 mov di,bp add di,02000h ; offset into video buffer ; the video buffer mov cl,dl ; number of odd scanlines to draw push dxoddsl1: mov dx,3norept15: lodsb ; load 8 pixels from bitmap xor bh,bh mov bl,al ; copy into a base register shl bx,1 ; create a word address mov ax,[LUT1to2bit+bx] ; get the byte to word conversion xchg al,ah mov bx,es:[di] ; get the current displayed 8 pixels and ax,bx ; AND the AND mask in stosw ; write to the video buffer dec dx jnz norept15
add si,3 add di,80-6 loop oddsl1 pop dx
; XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN
mov si,[mode4SelectedPointer] add si,48
mov di,bp ; offset into video buffer
; Load a word of the pointer image, convert it to two bits per ; pixel and write to the screen for even scanlines
mov cl,dh ; number of even scanlines to draw push dxevensl2: mov dx,3norept16: lodsb ; load 8 pixels from bitmap xor bh,bh mov bl,al ; copy into a base register shl bx,1 ; create a word address mov ax,[LUT1to2bit+bx] ; get the byte to word conversion xchg al,ah mov bx,es:[di] ; get the current displayed 8 pixels xor ax,bx ; XOR the XOR mask in stosw ; write to the video buffer dec dx jnz norept16
add si,3 add di,80-6 loop evensl2 pop dx
; Load a word of the pointer image, convert it to two bits per ; pixel and write to the screen for odd scanlines
mov si,[mode4SelectedPointer] add si,48+3 mov di,bp add di,02000h ; offset into video buffer ; the video buffer mov cl,dl ; number of odd scanlines to drawoddsl2: mov dx,3norept17: lodsb ; load 8 pixels from bitmap xor bh,bh mov bl,al ; copy into a base register shl bx,1 ; create a word address mov ax,[LUT1to2bit+bx] ; get the byte to word conversion xchg al,ah mov bx,es:[di] ; get the current displayed 8 pixels xor ax,bx ; XOR the XOR mask in stosw ; write to the video buffer dec dx jnz norept17
add si,3 add di,80-6 loop oddsl2 pop es popa ret
; ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD;; This part of the code draws the pointer on an odd numbered scanline; of the video display. Since the video buffer is split, 0000 to 1fff; containing even scanlines and 2000 to 3fff containing odd, the data; must be manipulated in a subtly different fashion than that of the; even display scanline code.; The even scanline code display arrangement falls through naturally,; with an even scanline drawing thus:; buffer 0: scanline 0; buffer 1: scanline 0; buffer 0: scanline 1; buffer 1: scanline 1; buffer 0: scanline 2; buffer 1: scanline 2 etc.; whereas in the odd case:; buffer 1: scanline 0; buffer 0: scanline 0; buffer 1: scanline 1; buffer 0: scanline 1; buffer 1: scanline 2; buffer 0: scanline 2 etc.; and this requires that the odd image scanlines must be placed; one scanline lower in the even buffer than the even image scanlines; do in the odd buffer
drawonoddscanline:
; Load a word of the pointer image, convert it to two bits per ; pixel and write to the screen for odd scanlines
mov si,[mode4SelectedPointer] add di,02000h ; offset into video buffer ; the video buffer
xor cx,cx mov cl,dl ; number of odd scanlines to draw push dxoddsl3: mov dx,3norept18: lodsb ; load 8 pixels from bitmap xor bh,bh mov bl,al ; copy into a base register shl bx,1 ; create a word address mov ax,[LUT1to2bit+bx] ; get the byte to word conversion xchg al,ah mov bx,es:[di] ; get the current displayed 8 pixels and ax,bx ; AND the AND mask in stosw ; write to the video buffer dec dx jnz norept18
add si,3 add di,80-6 loop oddsl3 pop dx
; Load a word of the pointer image, convert it to two bits per ; pixel and write to the screen for even scanlines
and dh,dh jz dontdothis1 ; can't do the loop 0 times
mov si,[mode4SelectedPointer] add si,3 mov di,bp add di,6 ; This is required to align the ; even and odd scanlines together mov cl,dh ; number of even scanlines to draw push dxevensl3: add di,80-6 ; remember even BELOW odd mov dx,3norept19: lodsb ; load 8 pixels from bitmap xor bh,bh mov bl,al ; copy into a base register shl bx,1 ; create a word address mov ax,[LUT1to2bit+bx] ; get the byte to word conversion xchg al,ah mov bx,es:[di] ; get the current displayed 8 pixels and ax,bx ; AND the AND mask in stosw ; write to the video buffer dec dx jnz norept19 add si,3 loop evensl3 pop dx
dontdothis1:
; XORODD XORODD XORODD XORODD XORODD XORODD XORODD XORODD XORODD XORODD XORODD
mov si,[mode4SelectedPointer] add si,48 mov di,bp ; offset into video buffer add di,02000h ; offset into video buffer ; the video buffer
; Load a word of the pointer image, convert it to two bits per ; pixel and write to the screen for odd scanlines
mov cl,dl ; number of odd scanlines to draw push dxoddsl4: mov dx,3norept20: lodsb ; load 8 pixels from bitmap xor bh,bh mov bl,al ; copy into a base register shl bx,1 ; create a word address mov ax,[LUT1to2bit+bx] ; get the byte to word conversion xchg al,ah mov bx,es:[di] ; get the current displayed 8 pixels xor ax,bx ; XOR the XOR mask in stosw ; write to the video buffer dec dx jnz norept20 add si,3 add di,80-6 loop oddsl4 pop dx
; Load a word of the pointer image, convert it to two bits per ; pixel and write to the screen for even scanlines
and dh,dh ; can't do a loop 0 times jz dontdothis2
mov si,[mode4SelectedPointer] add si,48+3 mov di,bp add di,6
mov cl,dh ; number of even scanlines to draw evensl4: add di,80-6 mov dx,3norept21: lodsb ; load 8 pixels from bitmap xor bh,bh mov bl,al ; copy into a base register shl bx,1 ; create a word address mov ax,[LUT1to2bit+bx] ; get the byte to word conversion xchg al,ah mov bx,es:[di] ; get the current displayed 8 pixels xor ax,bx ; XOR the XOR mask in stosw ; write to the video buffer dec dx jnz norept21
add si,3 loop evensl4
dontdothis2:
; XORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXOR
pop es popa retdrawmode4pointer endp
;========================================================================; Procedure to determine what the byte and bit offset is, in the current; VGA buffer for the top left hand corner of the pointer bitmap.; The X,Y value is modified for hotspot in this routine.; Y looping counter(ODD and EVEN) are also returned; The CGA buffer is interleaved, and runs from B800:0000 to B800:1999 for; odd scanlines and from B800:2000 for even scanlines.;; INPUT: CX,DX = pointer x,y coordinates; OUT :; carry set if either X or Y is out of screen; DX = byte offset to top left hand pointer pixel of the pointer; CL = bit offset in the byte; CH = 0FFh if ODD, 0 if EVEN; BP = Y loop counter(ODD in LSB and EVEN in MSB);========================================================================
detboundmode4 proc near
push ax push bx push ds
mov ax,cs mov ds,ax
assume ds:SpcMseSeg
; do the adjustment in x,y for pointer hotspot ; modify the raw X,Y values for hotspot
sub cx,[hotspot] ; adjust the x cartesian coord for hotspot jns dont_zero_xmode4; if x goes negative, assume zero xor cx,cx
dont_zero_xmode4:
sub dx,[hotspot+2] ; adjust the y cartesian coord for the hotspot jns dont_zero_ymode4; if y goes negative, assume zero xor dx,dx
dont_zero_ymode4:
cmp cx, 320 ; jae detboundmode4_exit ; CY is cleared cmp dx, 200 jae detboundmode4_exit ; CY is cleared ; determine the byte offset from the start of the video buffer ; for the modified coordinates. First calculate how many bytes ; there are for the number of scanlines -1 to where the pointer ; is. Also if the pointer starts on a odd scanline, set CF, else ; clear CF.
mov ax,dx ; copy Y position into AX mov bp,dx ; copy Y position into BP for use later
; CGA video buffer is split in two. Therefore, screen scanline 0 maps ; to video buffer scanline 0 and screen scanline 1 maps to video ; buffer+2000h, scanline 0
and ax,0fffeh ; do the mapping 0->0, 1->0, 2->1, 3->1 etc. ; and create a word table index mov bx, ax ; copy table index into a base register ; 2bits/pixel -> 4 pixels/byte ; sine x total is 320, we have 80bytes ; so a shl bx, 1 will be wrong. mov dx,[mult80lut+bx] ; do a fast LUT multiply by 80
; determine the byte position of the pixel in question
mov ax,cx ; save the x-coordinate displacement and ax,3 ; do a modulus 4 to find the pixel position ; in the byte. The byte number will be in DX.
; add the whole number of bytes in the current row to the number ; of complete-row bytes. Note that mode 4 is 2bits per pixel, so ; there are four pixels represented by one byte.
mov bx,cx ; Save in a base reg. to create a table index shl bx,1 ; Create a table index for word sized entries add dx,[mode4clipCXadjustLUT+bx]; DX hold the complete byte offset. mov cx, ax ; CX = bit offset in the byte.
mov ax, [mode4pointerLUT + bx] ; select appropriate pointer mov [mode4SelectedPointer], ax
; Odd or Even scanline? note BP contains y cartesian coordinate
mov bx, bp ; y coordinate shr bp, 1 ; shift right to determine if odd or even ; CF if odd, or 0 if even. sbb ch, ch ; CH = 0FFh if ODD, 0 if EVEN shl bx, 1 mov bp, [mode4clipDXLUT + bx] ;the Y counters stc ; we are fine, set the CY so we will return ; CY cleared.detboundmode4_exit: cmc ; revese the CY pop ds pop bx pop ax ret
detboundmode4 endp
;=============================================================================; Procedure to save the area of CGA video buffer into which the pointer will; be drawn. The memory buffer in which this data is stored is arranged odd; scanlines first, then even. So, the first 48 bytes are the odd scanline; data.;; Input: DX = byte offset; CL = bit offset in the byte; CH = 0FFh if ODD, 0 if EVEN; BP = Y loop counter, ODD in LSB, EVEN in MSB;;=============================================================================
savebkgrndmode4 proc near
pusha push es push ds
; set up the segment registers as required
mov ax,ds mov es,ax mov ax,0b800h mov ds,ax assume ds:nothing, es:SpcMseSeg mov si,dx ; start the save. or ch, ch je svbkeven ; check the returned carry flag
; the image's first scanline is odd
mov di,offset CGAbackgrnd ; where the background will be saved mov bx,bp ; set the loop counter up xor bh,bh ; don't want unwanted mess in MSB add si,2000h ; odd part of buffer starts at 2000hsvodd1: mov cx,3 ; copy six bytes rep movsw ; do the image scanline save add si,80-6 ; point to the next scanline dec bx ; decrement the loop counter jnz svodd1 ; do more scanlines if necessary
; save some even scanlines if need be.
mov si,dx ; offset into CGA buffer add si, 80 mov bx,bp ; set up the loop counter xchg bl,bh ; get the even part of loop counter xor bh,bh ; trash the top end trash and bx,bx ; check for a zero loop jz misseven ; can't have a loop which execs 0 times mov di,offset CGAbackgrnd+48; where the background will be savedsveven1: mov cx,3 ; copy six bytes = 24 pixels rep movsw ; do the scanline save add si,80-6 ; point to the next scanline dec bx ; decrement the loop counter jnz sveven1 ; do more scanlines if necessary
misseven: ; jump to here if there are no even scanlines to draw
jmp short endsavemode4
svbkeven: ; the image's first scanline is even
mov di,offset CGAbackgrnd+48; where the background will be saved
mov bx,bp ; get the loop counter xchg bl,bh ; rearrage to get the even part xor bh,bh ; clear out the trashsveven2: mov cx,3 ; copy six bytes rep movsw ; do the copy add si,80-6 ; point to the next scanline dec bx ; decrement the loop counter jnz sveven2 ; do more scanlines if necessary
mov si,dx ; offset into CGA buffer add si,2000h ; odd part of the video buffer mov di,offset CGAbackgrnd ; where to save the odd scanlines mov bx,bp ; get the loop counter xor bh,bh ; clear out the unwanted trashsvodd2: mov cx,3 ; copy six bytes rep movsw ; do the copy add si,80-6 ; point to the next scanline dec bx ; decrement the loop counter jnz svodd2 ; do more scanlines if necessary
endsavemode4: assume ds:SpcMseSeg, es:nothing
pop ds pop es popa retsavebkgrndmode4 endp
;=============================================================================; Procedure to restore the area of CGA video buffer into which the pointer; was drawn. The memory buffer in which this data is stored is arranged; odd scanlines first, then even. So, the first 48 bytes are the odd scanline; data.;; Input:; DX = byte offset to top left hand pointer pixel of the pointer; CL = bit offset in the byte; CH = 0FFh if ODD, 0 if EVEN; BP = Y loop counter(ODD in LSB and EVEN in MSB);;=============================================================================
restorebkgrndmode4 proc near
pusha push es
; set up the segment registers as required
mov ax,0b800h mov es,ax mov di,dx ; restore background or ch, ch je rsbkeven ; check the returned carry flag
; the image's first scanline is odd. The CGA buffer is translated ; so that a scanline (row N) from the even part of the buffer appears ; on the screen at raster I. The scanline at position N from the ; odd part of the video buffer maps to screen position I+1. If the ; 1st. scanline is odd, then this is drawn at raster A and the ; following algorithm draws the 1st. even row at raster A+1 to ; compensate for the video buffer arrangement.
mov si,offset CGAbackgrnd ; where the background is be saved add di,2000h ; do the odd buffer
mov bx,bp ; set the loop counter up xor bh,bh ; clear out the MSB trashrsodd1: mov cx,3 ; copy six bytes rep movsw ; do the restore add di,80-6 ; point to the next odd scanline dec bx ; decrement the loop counter jnz rsodd1 ; restore more even scanlines if needed
mov bx,bp ; let the loop counter xchg bl,bh ; get the even part xor bh,bh ; clear out the MSB trash and bx,bx ; test for zero even scanlines jz misseven1rs ; can't have a zero execute loop mov di,dx ; offset into CGA buffer add di,80 ; get the odd/even scanlines instep mov si,offset CGAbackgrnd+48; where the background is be savedrseven1: mov cx,3 ; restore six bytes rep movsw ; do the restore add di,80-6 ; point to the next even scanline dec bx ; decrement the loop counter jnz rseven1 ; restore more even scanlines if needed
misseven1rs: ; jump to here if there are no even scanlines to be restored.
jmp short endrestoremode4
rsbkeven: ; the image's first scanline is even
mov si,offset CGAbackgrnd+48; where the background will be saved
mov bx,bp ; get the loop counter xchg bl,bh ; get the even part of the loop counter xor bh,bh ; scrap the MSB trashrseven2: mov cx,3 ; restore six bytes rep movsw ; do the restore add di,80-6 ; point to the next even scanline dec bx ; decrement the loop counter jnz rseven2 ; do more even scanlines if needed
mov di,dx ; offset into CGA buffer add di,2000h ; do the odd buffer mov si,offset CGAbackgrnd ; where to save the odd scanlines
mov bx,bp ; set the loop counter up xor bh,bh ; scrap the MSB trashrsodd2: mov cx,3 ; restore six bytes rep movsw ; do the restore add di,80-6 ; point to the next odd scanline dec bx ; decrement the loop counter jnz rsodd2 ; restore more odd scanlines if needed
endrestoremode4: assume ds:SpcMseSeg, es:nothing
pop es popa retrestorebkgrndmode4 endp
;============================================================================; Procedure to draw the pointer image into the video buffer for mode 13h; VGA graphics.;; Input:; DX = byte offset; BP = Y loop counter; CX = X loop counter;;============================================================================
draw256pointer proc near pusha push es push ds
mov ax,0a000h ; point to the 256 colour mode video buffer mov es,ax mov ax,cs mov ds,ax
assume ds:SpcMseSeg, es:nothing
cld ; write forward through the buffer ; DX = TLHC pixel offset in the video buffer. mov di,dx ; point DI at the video buffer location of fun mov si, offset current_cursor ; we only use this cursor shape ; because every pixel is on byte ; boundary. The X counter would ; take care of X clippingy_256: push cx lodsw ;and mask mov dx, [si + 48 - 2] ;xor mask inc si ;we don't need the third byte xchg al, ah ; byte sequence xchg dh, dl ;x_256: shl ax, 1 ;AND mask bit sbb bl, bl ; bl = 0FFf if CY, 0 if not CY and bl, es:[di] ;and the target and save the result shl dx, 1 ;XOR mask bit sbb bh, bh ; xor bl, bh ;xor with the save result mov es:[di], bl ;update the target inc di ;next pixel loop x_256 ;until this scan line is done pop cx ;recovery X loop counter add di, 320 ;target address to next scan line sub di, cx dec bp ;Y counter jne y_256
pop ds pop es popa retdraw256pointer endp
;=============================================================================; Procedure to save the area of 256 colour mode video buffer into which the; pointer will be drawn. The memory buffer in which this data is stored is; arranged odd scanlines first, then even. So, the first 48 bytes are the odd; scanline data.;; Input:; DX = byte offset; BP = Y loop counter; CX = X loop counter;;=============================================================================
savebkgrndmode13 proc near pusha push es push ds
mov di,offset bkgrnd256 ; point to the area in which backgound ; data will be saved mov si,dx ; SOURCE: the video buffer at x,y
mov ax,0a000h mov ds,ax mov ax,cs mov es,ax mov bx, cx ;x counter mov dx, 320 sub dx, bx assume ds:nothing, es:SpcMseSeg cldsave_256_loop: mov cx, bx shr cx, 1 rep movsw adc cl, 0 rep movsb add si, dx ; next scan line offset dec bp ; until Y counter is done jne save_256_loop
pop ds pop es
assume es:nothing, ds:SpcMseSeg
popa retsavebkgrndmode13 endp
;=============================================================================; Procedure to replace an existing pointer image in the 256 colour video; buffer with the data that was there previous to the pointer draw operation.; The data is stored in an internal (to the driver) buffer.;; Input:; DX = byte offset; BP = Y loop counter; CX = X loop counter;;=============================================================================
restorebkgrndmode13 proc near pusha push es
mov di,dx ; DESTINATION: in the VRAM mov ax,0a000h ; point a segment register at video buffer mov es,ax
assume es:nothing mov bx, cx mov si,offset bkgrnd256 ; where the data is saved mov dx, 320 sub dx, bx
cld ; write forward in memoryrestore_256_loop: mov cx, bx shr cx, 1 rep movsw adc cl, 0 rep movsb add di, dx dec bp jne restore_256_loop
pop es popa retrestorebkgrndmode13 endp
;========================================================================; Procedure to determine what the byte offset is, in the current; VGA buffer for the top left hand corner of the pointer bitmap.; The X,Y value is modified for hotspot in this routine. X and Y looping; counters are also returned.;; INPUT: CX,DX = pointer x,y coordinates; OUT :; carry set if either X or Y is out of screen; DX = byte offset to top left hand pointer pixel of the pointer; CX = X counter; BP = Y counter;========================================================================
detboundmode13 proc near
push ax push bx push ds
mov ax,cs mov ds,ax
assume ds:SpcMseSeg
; do the adjustment in x,y for pointer hotspot ; modify the raw X,Y values for hotspot
sub cx,[hotspot] ; adjust the x cartesian coord for hotspot jns dont_zero_xmode13; if x goes negative, assume zero xor cx,cx
dont_zero_xmode13:
sub dx,[hotspot+2] ; adjust the y cartesian coord for the hotspot jns dont_zero_ymode13; if y goes negative, assume zero xor dx,dx
dont_zero_ymode13: cmp cx, 320 jae detboundmode13_exit ; CY is cleared cmp dx, 200 ; jae detboundmode13_exit ; CY is cleared
; CX and DX are now validated for the following section: buffer ; offset determination. Note, unlike other video modes, mode 13 ; provides a direct mapping of the video display to video buffer. ; in other words; 1 byte represents 1 pixel. From this, it is not ; necessary to provide byte alignment data.
mov bx,dx ; save in a base register shl bx,1 ; create a word table index mov dx,[mult320LUT+bx] ; do the multiply by 320 ; add in the offset along the current raster.
add dx,cx ; cx contains the byte offset from mov ax,[mode4clipDXLUT + bx]; get Y loop counter from table add al, ah ; the table has ODD/EVEN counters cbw mov bp, ax ; the final Y counter ; column 0. mov ax, 320 ; calculate X loop counter sub ax, cx cmp ax, 16 ; jl set_new_x_counter mov ax, 16set_new_x_counter: mov cx, ax ; X counter stc ; everything is fine, set CY ; so we will return CY cleareddetboundmode13_exit: cmc ; complement the CY pop ds pop bx pop ax ret
detboundmode13 endp
public SpcMseEndSpcMseEnd label byte
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++;; Installation Code From Here Downwards;;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
; segment:offset table for redirected mouse functions for real rom version.
ifdef DBCSmio_table dw 42 dup(?)else ; !DBCSmio_table dw 38 dup(?)endif ; !DBCS
assume cs:SpcMseSeg,ds:nothing,es:nothing
public InstSpcMse;; InstSpcMse - Installs the softpc mouse driver code;; Inputs: ds == Resident location of SpcMseSeg; Outputs: None;InstSpcMse proc near
;;;;;;;;;;;;;;;;do ret to use old mouse driver;;; ret
pusha
ifdef DBCS push ds mov ax, 6300h int 21h mov ax, ds pop ds jc got_dbcs_vector mov ds:dbcs_vector_off, si mov ds:dbcs_vector_seg, ax
got_dbcs_vector:endif ; DBCS ; save old int 10 vector xor ax,ax mov es,ax mov ax,es:[40h] mov si,offset old_vid_int mov word ptr ds:[si],ax mov ax,es:[42h] mov word ptr ds:[si+2],axifdef DBCS mov es:[40], offset DBCS_mouse_int10 mov ax, cs mov es:[42], axendif ; DBCS
mov bx,ds mov si,offset sysinitgrp:mio_table push ds push cs pop ds
mov word ptr ds:[si], offset mouse_io mov word ptr ds:[si+2],bx
IFDEF MOUSE_VIDEO_BIOS
mov word ptr ds:[si+4],offset mouse_video_io mov word ptr ds:[si+6],bx
ENDIF ; MOUSE_VIDEO_BIOS
mov word ptr ds:[si+8],offset mouse_int1 mov word ptr ds:[si+10],bx mov word ptr ds:[si+12], offset mouse_version mov word ptr ds:[si+14],bx mov word ptr ds:[si+16],offset mouse_copyright mov word ptr ds:[si+18],bx mov word ptr ds:[si+20],offset video_io mov word ptr ds:[si+22],bx mov word ptr ds:[si+24],offset mouse_int2 mov word ptr ds:[si+26],bx mov word ptr ds:[si+28],offset entry_point_from_32bit mov word ptr ds:[si+30],bx mov word ptr ds:[si+32],offset int33function0 mov word ptr ds:[si+34],bx mov word ptr ds:[si+36],offset int33function1 mov word ptr ds:[si+38],bx mov word ptr ds:[si+40],offset int33function2 mov word ptr ds:[si+42],bx mov word ptr ds:[si+44],offset int33function9 mov word ptr ds:[si+46],bx mov word ptr ds:[si+48],offset current_position_x mov word ptr ds:[si+50],bx mov word ptr ds:[si+52],offset current_position_y mov word ptr ds:[si+54],bx mov word ptr ds:[si+56],offset mouseINB mov word ptr ds:[si+58],bx mov word ptr ds:[si+60],offset mouseOUTB mov word ptr ds:[si+62],bx mov word ptr ds:[si+64],offset mouseOUTW mov word ptr ds:[si+66],bx mov word ptr ds:[si+68],offset VRAMlasttextcelloff mov word ptr ds:[si+70],bx mov word ptr ds:[si+72],offset internalCF mov word ptr ds:[si+74],bx mov word ptr ds:[si+76],offset function3data mov word ptr ds:[si+78],bx mov word ptr ds:[si+80],offset conditional_off mov word ptr ds:[si+82],bxifdef DBCS mov word ptr ds:[si+84], offset saved_ac_on_mouse_cursor mov word ptr ds:[si+86],bx mov word ptr ds:[si+88], offset background mov word ptr ds:[si+90],bxendif ; DBCS pop ds mov bx, offset sysinitgrp:mio_table bop 0C8h ; Host mouse installer BOP
; get the freshly written int 33h vector from IVT; write the vector segment:offset data to the jump patch
xor ax,ax mov es,ax mov ax,es:[33h*4] mov bx,es:[(33h*4)+2] mov si,offset moff mov word ptr ds:[si],ax mov word ptr ds:[si+2],bx add ax,2 ; HLL entry point mov si,offset loffset mov word ptr ds:[si],ax mov word ptr ds:[si+2],bx
; write the new value to the IVT call DOCLI mov bx, offset int33h_vector mov word ptr es:[33h*4], bx mov bx, ds mov word ptr es:[(33h*4)+2], bx call DOSTI
popa retInstSpcMse endp
SpcMseSeg ends end
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