You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.1 KiB
75 lines
2.1 KiB
;---------------------------Module-Header------------------------------;
|
|
; Module Name: vgaregs.asm
|
|
;
|
|
; Copyright (c) 1992 Microsoft Corporation
|
|
;-----------------------------------------------------------------------;
|
|
;-----------------------------------------------------------------------;
|
|
; VOID vInitRegs(void)
|
|
;
|
|
; Sets the VGA's data control registers to their default states.
|
|
;
|
|
;-----------------------------------------------------------------------;
|
|
|
|
.386
|
|
|
|
.model small,c
|
|
|
|
assume cs:FLAT,ds:FLAT,es:FLAT,ss:FLAT
|
|
assume fs:nothing,gs:nothing
|
|
|
|
.xlist
|
|
include stdcall.inc ;calling convention cmacros
|
|
include i386\strucs.inc
|
|
include i386\driver.inc
|
|
include i386\egavga.inc
|
|
|
|
.list
|
|
|
|
.code
|
|
|
|
cProc vInitRegs,4,< \
|
|
uses esi edi ebx, \
|
|
ppdev: ptr PDEV >
|
|
|
|
mov esi,ppdev
|
|
|
|
; Initialize sequencer to its defaults (all planes enabled, index
|
|
; pointing to Map Mask).
|
|
|
|
mov dx,VGA_BASE + SEQ_ADDR
|
|
mov ax,(MM_ALL shl 8) + SEQ_MAP_MASK
|
|
out dx,ax
|
|
|
|
; Initialize graphics controller to its defaults (set/reset disabled for
|
|
; all planes, no rotation & ALU function == replace, write mode 0 & read
|
|
; mode 0, color compare ignoring all planes (read mode 1 reads always
|
|
; return 0ffh, handy for ANDing), and the bit mask == 0ffh, gating all
|
|
; bytes from the CPU.
|
|
|
|
mov dl,GRAF_ADDR
|
|
mov ax,(0 shl 8) + GRAF_ENAB_SR
|
|
out dx,ax
|
|
|
|
mov ax,(DR_SET shl 8) + GRAF_DATA_ROT
|
|
out dx,ax
|
|
|
|
; Default to read mode 0, write mode 0:
|
|
|
|
mov edx,VGA_BASE + GRAF_ADDR
|
|
mov ah,byte ptr [esi].pdev_ulrm0_wmX[0]
|
|
mov al,GRAF_MODE
|
|
out dx,ax ;write mode 0, read mode 0
|
|
|
|
mov ax,(0 shl 8) + GRAF_CDC
|
|
out dx,ax
|
|
|
|
mov ax,(0FFh shl 8) + GRAF_BIT_MASK
|
|
out dx,ax
|
|
|
|
cRet vInitRegs
|
|
|
|
|
|
endProc vInitRegs
|
|
|
|
end
|
|
|