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650 lines
17 KiB
650 lines
17 KiB
TITLE MSBIO2 - DOS 3.3
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;-------------------------------------------------------------------------------
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; :
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; Microsoft Bio :
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; :
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; The file msbio.asm is the main file in the Mircosoft bio. This file :
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; includes the other main files in the bio. Most of the routines are :
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; in these include files. The main files included are: :
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; :
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; File Contains :
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; :
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; msdisk.inc Disk device driver routines :
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; ms96tpi.inc Routines for 96tpi drives :
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; msaux.inc Device driver for the rs-232 serial ports :
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; msclock.inc Device driver for "clock$" device :
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; mscon.inc Device driver for "con" :
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; mslpt.inc Device driver for the printers :
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; :
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; Each of these files contain a header section documenting the code :
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; in that file. :
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; Msbio also includes several files for equ's, structure definition, :
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; macro definitions, etc. These are: :
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; :
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; msbiomes.inc msmacro.inc devsym.inc :
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; dskprm.inc error.inc :
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; :
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; Each of these file contains explanitory notes. :
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; :
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; The actual code in msbio can be broken down into several piece: :
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; :
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; macro definitions Several marco are defined in msbio. They :
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; are a few odds and end that did not fit :
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; anywhere else. :
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; :
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; Command Jump Table List of entry points in the device drivers. :
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; See notation below for full explination. :
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; :
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; Interrupt and Strategy :
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; Entry points Calls on the device driver first come to here. :
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; There is common code with pushes registers and :
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; the like before jumping to routines in the :
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; driver files. The common exit points are also :
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; in this file. :
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; :
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; Miscellaneous Code There are several routines and data structure :
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; declarations. See below for details. :
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; :
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;-------------------------------------------------------------------------------
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;
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; If the variable TEST is non-zero then code for debugging is included.
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; The extra code will make the binary file nuch larger.
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; The symbol is also defined in msequ.inc. Both must be changed to
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; turn debugging on or off.
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;
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; The level of the debugging is controled by the variable fTestBits in
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; this file. See the comment preceeding the variable for more information.
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; The actual routines which print the messages are in msmacro.inc
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; See the header comment in this file for more information.
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;
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;
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; Revision History
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;
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; REV 2.1 5/1/83 ARR added timer int handler and changed order of AUX
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; PRN init for HAL0
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;
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; REV 2.15 7/13/83 ARR Because of IBM design issues, and that BASCOM
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; is ill behaved with respect to the 1CH timer interrupt,
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; the timer handler has to be backed out! The intended
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; code is commented out and has an ARR 2.15 annotation.
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; This means the BIOS will go back to the multiple roll
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; over bug.
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;
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; REV 2.20 8/5/83 ARR IBM makes hardware change. Now wants to use half
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; height drives for HAL0, and back fit for PC/PC XT. Problem
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; with head settle time. Previous drives got by on a 0
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; settle time, 1/2 hight drives need 15 head settle when
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; doing WRITEs (0 ok on READ) if the head is being stepped.
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; This requires a last track value to be kept so that BIOS
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; knows when head is being moved. To help out
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; programs that issue INT 13H directly, the head settle will
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; normally be set to 15. It will be changed to 0 on READs,
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; or on WRITEs which do not require head step.
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;
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; REV 2.21 8/11/83 MZ IBM wants write with verify to use head settle 0.
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; Use same trick as above.
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;
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; REV 2.25 6/20/83 mjb001 added support for 96tpi and salmon
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;
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; REV 2.30 6/27/83 mjb002 added real-time clock
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;
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; REV 2.40 7/8/83 mjb003 added volume-id checking and int 2f macro
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; definitions push* and pop*
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;
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; REV 2.41 7/12/83 ARR more 2.X enhancements. Open/Close media change
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;
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; REV 2.42 11/3/83 ARR more 2.X enhancements. Disk OPEN/CLOSE, FORMAT
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; code and other misc hooked out to shrink BIOS. Code for
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; Disk OPEN/CLOSE, FORMAT included only with 96tpi disks.
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;
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; Rev 2.43 12/6/83 MZ Examine boot sectors on hard disks for 16-bit fat
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; check. Examine large fat bit in BPB for walk of media for
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; DOS
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;
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; Rev 2.44 12/9/83 ARR Change to error reporting on INT 17H
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;
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; Rev 2.45 12/22/83 MZ Make head settle change only when disk parm is 0.
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;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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;
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; IBM ADDRESSES FOR I/O
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;
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;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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;Below was moved from sysinit1
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ROMSEGMENT EQU 0F000H
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MODELBYTE EQU DS:BYTE PTR [0FFFEH]
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MODELPCJR EQU 0FDH
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test=0
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;;Rev 3.30 modification ----------------------------
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INCLUDE MSGROUP.INC ;DEFINE CODE SEGMENT
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INCLUDE MSEQU.INC
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INCLUDE DEVSYM.INC
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INCLUDE PUSHPOP.INC
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INCLUDE MSMACRO.INC
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ASSUME DS:NOTHING,ES:NOTHING
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EXTRN DSK$IN:NEAR
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EXTRN SETPTRSAV:NEAR
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EXTRN OUTCHR:NEAR
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EXTRN SETDRIVE:NEAR
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EXTRN FLUSH:NEAR
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EXTRN HARDERR:NEAR
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EXTRN HARDERR2:NEAR
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EXTRN MAPERROR:NEAR
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EXTRN GETBP:NEAR
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EXTRN CHECKSINGLE:NEAR
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EXTRN CHECK_TIME_OF_ACCESS:NEAR
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EXTRN EXIT:NEAR
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EXTRN HAS1:NEAR
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EXTRN HAS1_res:NEAR
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EXTRN READ_SECTOR:NEAR
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EXTRN INT_2F_13:FAR
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EXTRN OLD13:DWORD
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;DATA
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EXTRN PTRSAV:DWORD
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EXTRN START_BDS:WORD
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EXTRN FDRIVE1:WORD
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EXTRN FDRIVE2:WORD
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EXTRN FDRIVE3:WORD
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EXTRN FDRIVE4:WORD
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EXTRN FLAGBITS:WORD
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EXTRN TIM_DRV:BYTE
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EXTRN MEDBYT:BYTE
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EXTRN DRVMAX:BYTE
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PATHSTART 005,DISK
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EVENB
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PUBLIC ORIG19
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ORIG19 DD ?
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PUBLIC INT19SEM
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INT19SEM DB 0 ; INDICATE THAT ALL INT 19
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; INITIALIZATION IS COMPLETE
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IRP AA,<02,08,09,0A,0B,0C,0D,0E,70,72,73,74,76,77>
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public Int19OLD&AA
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Int19OLD&AA dd -1 ;Orignal hw int. vec for INT 19h.
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ENDM
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EVENB
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PUBLIC DSKDRVS
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DSKDRVS DW FDRIVE1
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DW FDRIVE2
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DW FDRIVE3
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DW FDRIVE4
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PUBLIC HDSKTAB
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HDSKTAB DW HDRIVE
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DW DRIVEX
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;* Next area is reseved for mini disk BPB pointers *** 4/7/86
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;* Don't change this pos. Should be add. from DskDrvs *** 4/7/86
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MINI_DISK_BPB_PTRS DB 40 dup (?) ;4/7/86 - mem res for Mini disk.
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EVENB
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PUBLIC INT_2F_NEXT
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INT_2F_NEXT DD ?
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RET_ADDR DD ?
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PATHEND 005,DISK
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;;End of modification ----------------------------
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; INT19
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;
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; We "hook" the INT_REBOOT vector, because contrary to IBM documentation,
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; it does NOT "bootstrap" the machine. It leaves memory almost untouched.
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; Since the BIOS_INIT code assumes that certain Interrupt Vectors point to
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; the ROM_BIOS we must "unhook" them before issuing the actual INT_REBOOT.
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; Currently the following vectors need to be unhooked:
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; 02,08,09,0A,0B,0C,0D,0E,70,72,73,74,75,76,77
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;
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Public Int19
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Int19 proc FAR
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xor AX,AX ; get data segment to
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mov DS,AX ; point to the vector table
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assume ds:nothing
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assume es:nothing
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les DI,Old13 ; get ES to point to this segment
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mov DS:[13h*4],DI ; restore old int13 value
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mov DS:[13h*4+2],ES
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cmp Byte ptr Int19Sem, 0
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jnz int19vecs
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jmp doint19
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;;Dos 3.30 Will not support the PC-Jr
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;;Rev 3.30 modification ----------------------------
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; ON THE PCJR, DON'T REPLACE ANY VECTORS
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; MODEL BYTE DEFINITIONS FROM MSSTACK.ASM
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; MOV AX,ROMSEGMENT
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; MOV DS,AX
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; MOV AL,MODELPCJR
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;
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; CMP AL,MODELBYTE
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; JNE INT19VECS
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; JMP DOINT19
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;Stacks code has changed these hardware interrupt vectors
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;STKINIT in SYSINIT1 will initialzie Int19hOLDxx values.
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int19vecs:
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;
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; we now need to unhook all the vector replace to prevent stack overflow
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;
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;;Rev 3.30 modification ----------------------------
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XOR AX,AX
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MOV DS,AX
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IRP AA,<02,08,09,0A,0B,0C,0D,0E,70,72,73,74,76,77>
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LES DI,Int19OLD&AA
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mov ax,es ; Put segment where we can compare it
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cmp ax,-1 ; OPT 0ffffh is not likely
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je skip_int&AA ; OPT could get away without checking
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cmp di,-1 ; OPT offset here.
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je skip_int&AA
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MOV DS:[AA&H*4],DI
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MOV DS:[AA&H*4+2],ES
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skip_int&AA:
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ENDM
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;;End of modification ----------------------------
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doint19:
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LES DI,Orig19
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MOV DS:[19h*4],DI
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MOV DS:[19h*4+2],ES
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INT 19h
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INT19 ENDP
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ASSUME DS:CODE
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;*****************************************************************************
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PUBLIC DSK$INIT
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DSK$INIT PROC NEAR
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PUSH CS
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POP DS
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MOV AH,BYTE PTR DRVMAX
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MOV DI,OFFSET DskDrvs
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JMP SetPTRSAV
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DSK$INIT ENDP
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;
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; Int 2f handler for external block drivers to communicate with the internal
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; block driver in msdisk. The multiplex number chosen is 8. The handler
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; sets up the pointer to the request packet in [PTRSAV] and then jumps to
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; DSK$IN, the entry point for all disk requests.
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; On exit from this driver (at EXIT), we will return to the external driver
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; that issued this Int 2F, and can then remove the flags from the stack.
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; This scheme allows us to have a small external device driver, and makes
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; the maintainance of the various drivers (DRIVER and msBIO) much easier,
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; since we only need to make changes in one place (most of the time).
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;
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; AL contains the Int2F function:
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; 0 - Check for installed handler - RESERVED
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; 1 - Install the BDS into the linked list
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; 2 - DOS request
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;
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MYNUM EQU 8
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Public Int2F_Disk
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Int2F_Disk PROC FAR
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cmp ah,MYNUM
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je Mine
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jmp cs:[Int_2F_Next] ; chain to next Int 2F handler
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Mine:
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cmp al,0F8H ; IRET on reserved functions
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jb Do_Func
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IRET
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Do_Func:
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or al,al ; A GET INSTALLED STATE request?
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jne Disp_Func
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mov al,0FFH
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IRET
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Disp_Func:
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Message fTestInit,<"Int2F_disk",cr,lf>
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cmp al,1 ; Request for installing BDS?
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jne Do_DOS_Req
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call Install_BDS
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IRET
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Do_DOS_Req:
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; Set up pointer to request packet
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MOV WORD PTR CS:[PTRSAV],BX
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MOV WORD PTR CS:[PTRSAV+2],ES
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jmp DSK$IN
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Int2F_Disk ENDP
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;
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; Install_BDS installs a BDS a location DS:DI into the current linked list of
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; BDS maintained by this device driver. It places the BDS at the END of the
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; list.
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Public Install_BDS
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INSTALL_BDS PROC NEAR
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message ftestinit,<"Install BDS",cr,lf>
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; ds:di point to BDS to be installed
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les si,dword ptr cs:[Start_BDS] ; Start at beginning of list
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push es ; Save pointer to current BDS
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push si
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; es:si now point to BDS in linked list
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Loop_Next_BDS:
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cmp si,-1 ; got to end of linked list?
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jz Install_Ret
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; If we have several logical drives using the same physical drive, we must
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; set the I_Am_Mult flag in each of the appropriate BDSs.
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mov al,byte ptr ds:[di].DriveNum
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cmp byte ptr es:[si].DriveNum,al
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jnz Next_BDS
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message ftestinit,<"Logical Drives",cr,lf>
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xor bx,bx
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mov bl,fI_Am_Mult
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or word ptr ds:[di].flags,bx ; set flags in both BDSs concerned
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or word ptr es:[si].flags,bx
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mov bl,fI_Own_Physical
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xor bx,-1
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and word ptr ds:[di].flags,bx ; reset that flag for 'new' BDS
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; We must also set the fChangeline bit correctly.
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mov bx,word ptr es:[si].flags ; determine if changeline available
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and bl,fChangeline
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xor bh,bh
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or word ptr ds:[di].flags,bx
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Next_BDS:
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; Before moving to next BDS, preserve pointer to current one. This is needed at
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; the end when the new BDS is linked into the list.
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pop bx ; discard previous pointer to BDS
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pop bx
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push es
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push si
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mov bx,word ptr es:[si].link + 2
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mov si,word ptr es:[si].link
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mov es,bx
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jmp short Loop_Next_BDS
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Install_Ret:
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pop si ; Retrieve pointer to last BDS
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pop es ; in linked list.
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mov ax,ds
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mov word ptr es:[si].link+2,ax ; install BDS
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mov word ptr es:[si].link,di
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mov word ptr ds:[di].link,-1 ; set NEXT pointer to NULL
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RET
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INSTALL_BDS ENDP
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;
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; RE_INIT installs the Int 2F vector that will handle communication between
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; external block drivers and the internal driver. It also installs the
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; Reset_Int_13 interface. It is called by SYSYINIT
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;
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PUBLIC RE_INIT
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RE_INIT PROC FAR
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Message ftestinit,<"REINIT",CR,LF>
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PUSH AX
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PUSH DS
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PUSH DI
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XOR DI,DI
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MOV DS,DI
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MOV DI,2FH*4 ; point it to Int 2F Vector
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MOV AX,WORD PTR DS:[DI]
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MOV WORD PTR CS:[INT_2F_NEXT],AX
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MOV AX,WORD PTR DS:[DI+2] ; preserve old Int 2F vector
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MOV WORD PTR CS:[INT_2F_NEXT+2],AX
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; INSTALL the Reset_Int_13
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; interface
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CLI
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MOV Word Ptr DS:[DI],Offset Int_2f_13 ; install new vectors
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MOV Word Ptr DS:[DI+2],CS
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STI
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POP DI
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POP DS
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POP AX
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RET
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RE_INIT ENDP
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;-------------------------------------------------
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;
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; Ask to swap the disk in drive A:
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; Using a different drive in a one drive system so
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; request the user to change disks
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;
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Public SWPDSK
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SWPDSK PROC NEAR
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mov al,byte ptr ds:[di].drivelet ; get the drive letter
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add al,"A"
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mov cs:DRVLET,AL
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push ds ; preserve segment register
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push cs
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pop ds
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mov SI,OFFSET SNGMSG ; ds:si -> message
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push BX
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call WRMSG ;Print disk change message
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call FLUSH
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; wait for a keyboard character
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xor AH, AH ; set command to read character
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int 16h ; call rom-bios
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POP BX
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pop ds ; restore segment register
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WRMRET:
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ret
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SWPDSK ENDP
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;----------------------------------------------
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;
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; WrMsg writes out message pointed to by [SI]
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;
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Public WrMsg
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WRMSG PROC NEAR
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lodsb ; get the next character of the message
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or AL,AL ; see fi end of message
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jz WRMRET
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pushf
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push CS
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call OUTCHR
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jmp SHORT WRMSG
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WRMSG ENDP
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INCLUDE BIOMES.INC
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;
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; End of support for multiple floppies with no logical drives
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; This is not 'special' any more because we now have the capability of
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; defining logical drives in CONFIG.SYS. We therefore keep the code for
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; swapping resident ALL the time.
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;
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;;Rev 3.30 modification ----------------------------
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;Variables for Dynamic Relocatable modules
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;These should be stay resident.
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public INT6C_RET_ADDR
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INT6C_RET_ADDR DD ? ;ret add from INT 6C for P12 mach
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PATHSTART 001,CLK
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;
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; DATA STRUCTURES FOR REAL-TIME DATE AND TIME
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;
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public BIN_DATE_TIME
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public MONTH_TABLE
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public DAYCNT2
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public FEB29
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BIN_DATE_TIME:
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DB 0 ; CENTURY (19 OR 20) OR HOURS (0-23)
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DB 0 ; YEAR IN CENTURY (0-99) OR MINUTES (0-59)
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DB 0 ; MONTH IN YEAR (1-12) OR SECONDS (0-59)
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DB 0 ; DAY IN MONTH (1-31)
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MONTH_TABLE:
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DW 0 ;MJB002 JANUARY
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DW 31 ;MJB002 FEBRUARY
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DW 59 ;MJB002
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DW 90 ;MJB002
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DW 120 ;MJB002
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DW 151 ;MJB002
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DW 181 ;MJB002
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DW 212 ;MJB002
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DW 243 ;MJB002
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DW 273 ;MJB002
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DW 304 ;MJB002
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DW 334 ;MJB002
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DAYCNT2 DW 0000 ;MJB002 TEMP FOR CNT OF DAYS SINCE 1-1-80
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FEB29 DB 0 ;MJB002 FEBRUARY 29 IN A LEAP YEAR FLAG
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PATHEND 001,CLK
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;;End of modification modification ----------------------------
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Public EndFloppy
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EndFloppy Label Byte
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|
;
|
|
; End of code for virtual floppy drives
|
|
;
|
|
Public EndSwap
|
|
EndSwap Label Byte
|
|
|
|
PATHSTART 004,BIO
|
|
|
|
Public HNUM
|
|
HNUM DB 0 ; number of hardfile (hard drives)
|
|
|
|
Public HardDrv
|
|
HARDDRV DB 80H ;Physical drive number of first hardfile
|
|
|
|
|
|
;
|
|
; "HDRIVE" is a hard disk with 512 byte sectors
|
|
;
|
|
|
|
EVENB
|
|
Public BDSH
|
|
BDSH DW -1 ; Link to next structure
|
|
DW Code
|
|
DB 80h ; physical drive number
|
|
DB "C" ; Logical Drive Letter
|
|
Public HDRIVE
|
|
HDRIVE:
|
|
DW 512
|
|
DB 1 ; Sectors/allocation unit
|
|
DW 1 ; Reserved sectors for DOS
|
|
DB 2 ; No. of allocation tables
|
|
DW 16 ; Number of directory entries
|
|
DW 0000 ; Number of sectors (at 512 bytes each)
|
|
DB 11111000B ; Media descriptor
|
|
DW 1 ; Number of FAT sectors
|
|
DW 00 ; Sector limit
|
|
DW 00 ; Head limit
|
|
DW 00 ; Hidden sector count
|
|
DB 0 ; TRUE => bigfat
|
|
OPCNTH DW 0 ; Open Ref. Count
|
|
VOLIDH DB "NO NAME ",0 ; Volume ID for this disk
|
|
DB 3 ; Form Factor
|
|
FLAGSH DW 0020H ; Various Flags
|
|
dw 40 ; number of cylinders
|
|
RecBPBH db 31 dup (?) ; Recommended BPB for drive
|
|
TRACKH DB -1 ; Last track accessed on this drive
|
|
TIM_LOH DW -1 ; Keep these two contiguous (?)
|
|
TIM_HIH DW -1
|
|
;
|
|
; End of single hard disk section
|
|
;
|
|
|
|
|
|
Public EndOneHard
|
|
EndOneHard Label Byte
|
|
|
|
|
|
|
|
|
|
;
|
|
;"DRIVEX" is an extra type of drive usually reserved for an
|
|
; additional hard file
|
|
;
|
|
|
|
EVENB
|
|
Public BDSX
|
|
BDSX DW -1 ; Link to next structure
|
|
DW Code
|
|
DB 81h ; physical drive number
|
|
DB "D" ; Logical Drive Letter
|
|
Public DRIVEX
|
|
DRIVEX:
|
|
DW 512
|
|
DB 00 ; Sectors/allocation unit
|
|
DW 1 ; Reserved sectors for DOS
|
|
DB 2 ; No. of allocation tables
|
|
DW 0000 ; Number of directory entries
|
|
DW 0000 ; Number of sectors (at 512 bytes each)
|
|
DB 11111000B ; Media descriptor
|
|
DW 0000 ; Number of FAT sectors
|
|
DW 00 ; Sector limit
|
|
DW 00 ; Head limit
|
|
DW 00 ; Hidden sector count
|
|
DB 0 ; TRUE => bigfat
|
|
OPCNTD DW 0 ; Open Ref. Count
|
|
VOLIDD DB "NO NAME ",0 ; Volume ID for this disk
|
|
DB 3 ; Form Factor
|
|
FLAGSD DW 0020H ; Various Flags
|
|
dw 40 ; number of cylinders
|
|
RecBPBD db 31 dup (?) ; Recommended BPB for drive
|
|
TRACKD DB -1 ; Last track accessed on this drive
|
|
TIM_LOD DW -1 ; Keep these two contiguous
|
|
TIM_HID DW -1
|
|
|
|
;
|
|
; End of section for two hard disks
|
|
Public EndTwoHard
|
|
EndTwoHard Label Byte
|
|
|
|
PATHEND 004,BIO
|
|
|
|
|
|
Public TwoHard
|
|
TWOHARD LABEL BYTE
|
|
|
|
PAGE
|
|
include ms96tpi.inc
|
|
|
|
;;Rev 3.30 modification ----------------------------
|
|
;Memory allocation for BDSM table.
|
|
PUBLIC BDSMs
|
|
BDSMs BDSM_type Max_mini_dsk_num dup (<>) ;currently max. 23
|
|
|
|
;** End_of_BDSM defined in MSINIT.ASM will be used to set the appropriate
|
|
;** ending address of BDSM table.
|
|
;;End of modification ----------------------------
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;bug005sp
|
|
;
|
|
;;3.3 BUG FIX -SUNILP ------------------------------
|
|
;Paragraph buffer between the BDSMs and MSHARD
|
|
;
|
|
;The relocation code for MSHARD needs this. this cannot be used for
|
|
;anything. nothing can come before this or after this.....IMPORTANT!!!!
|
|
;don't get too smart and using this buffer for anything!!!!!!
|
|
;
|
|
; db 16 dup(0)
|
|
;
|
|
;end of bug fix buffer
|
|
;;
|
|
;;3.3 BUG FIX -SUNILP------------------------------
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;bug005sp
|
|
CODE ENDS
|
|
END
|