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Technotools (Chestnut CD-ROM)(1993).ISO
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lang_c
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vgakit41
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banks.asm
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Assembly Source File
|
1991-10-02
|
14KB
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942 lines
include model.h
;
; VGAKIT Version 4.1
;
; Copyright 1988,89,90,91 John Bridges
; Free for use in commercial, shareware or freeware applications
;
; BANKS.ASM
;
.data
OSEG equ DS: ;segment override for variable access
bankadr dw ?
if @Codesize
bankseg dw ?
endif
public curbk
curbk dw ?
public vga512,vga1024
vga512 dw ?
vga1024 dw ?
public cirrus,everex,paradise,tseng,trident,t8900
public ativga,aheada,aheadb,oaktech,video7
public chipstech,tseng4,genoa,ncr,compaq,vesa
cirrus dw ?
everex dw ?
paradise dw ?
tseng dw ?
trident dw ?
t8900 dw ?
ativga dw ?
aheada dw ?
aheadb dw ?
oaktech dw ?
video7 dw ?
chipstech dw ?
tseng4 dw ?
genoa dw ?
ncr dw ?
compaq dw ?
vesa dw ?
first dw ? ;flag so whichvga() is only called once
retval dw ? ;first return value from whichvga()
vgainfo label word
vesaid db 'VESA' ; 4 signature bytes
vesaver dw ? ; VESA version number
oemstr dd ? ; Pointer to OEM string
capabil db 4 dup (?) ; Capabilities of the video environment
modelst dd ? ; Pointer to supported Super VGA modes
vesashift db 0 ; number of bits to shift bank number left
.code
public newbank
public whichvga
newbank proc ;bank number is in AX
cli
mov OSEG[curbk],ax
if @Codesize
jmp dword ptr OSEG[bankadr]
else
jmp word ptr OSEG[bankadr]
endif
_tseng:: ;Tseng
push ax
push dx
and al,7
mov ah,al
shl al,1
shl al,1
shl al,1
or al,ah
or al,01000000b
mov dx,3cdh
out dx,al
sti
pop dx
pop ax
ret
_tseng4:: ;Tseng 4000 series
push ax
push dx
mov ah,al
mov dx,3bfh ;Enable access to extended registers
mov al,3
out dx,al
mov dl,0d8h
mov al,0a0h
out dx,al
and ah,15
mov al,ah
shl al,1
shl al,1
shl al,1
shl al,1
or al,ah
mov dl,0cdh
out dx,al
sti
pop dx
pop ax
ret
_trident:: ;Trident
push ax
push dx
mov dx,3ceh ;set pagesize to 64k
mov al,6
out dx,al
inc dl
in al,dx
dec dl
or al,4
mov ah,al
mov al,6
out dx,ax
mov dl,0c4h ;switch to BPS mode
mov al,0bh
out dx,al
inc dl
in al,dx
dec dl
mov ah,byte ptr OSEG[curbk]
xor ah,2
mov dx,3c4h
mov al,0eh
out dx,ax
sti
pop dx
pop ax
ret
_video7:: ;Video 7
push ax
push dx
push cx
and ax,15
mov ch,al
mov dx,3c4h
mov ax,0ea06h
out dx,ax
mov ah,ch
and ah,1
mov al,0f9h
out dx,ax
mov al,ch
and al,1100b
mov ah,al
shr ah,1
shr ah,1
or ah,al
mov al,0f6h
out dx,al
inc dx
in al,dx
dec dx
and al,not 1111b
or ah,al
mov al,0f6h
out dx,ax
mov ah,ch
mov cl,4
shl ah,cl
and ah,100000b
mov dl,0cch
in al,dx
mov dl,0c2h
and al,not 100000b
or al,ah
out dx,al
sti
pop cx
pop dx
pop ax
ret
_paradise:: ;Paradise
push ax
push dx
mov dx,3ceh
mov ax,50fh ;turn off write protect on VGA registers
out dx,ax
mov ah,byte ptr OSEG[curbk]
shl ah,1 ;change 64k bank number into 4k bank number
shl ah,1
shl ah,1
shl ah,1
mov al,9
out dx,ax
sti
pop dx
pop ax
ret
_chipstech:: ;Chips & Tech
push ax
push dx
mov dx,46e8h ;place chip in setup mode
mov ax,1eh
out dx,ax
mov dx,103h ;enable extended registers
mov ax,0080h
out dx,ax
mov dx,46e8h ;bring chip out of setup mode
mov ax,0eh
out dx,ax
mov ah,byte ptr OSEG[curbk]
shl ah,1 ;change 64k bank number into 16k bank number
shl ah,1
mov al,10h
mov dx,3d6h
out dx,ax
sti
pop dx
pop ax
ret
_ativga:: ;ATI VGA Wonder
push ax
push dx
mov ah,al
mov dx,1ceh
mov al,0b2h
out dx,al
inc dl
in al,dx
shl ah,1
and al,0e1h
or ah,al
mov al,0b2h
dec dl
out dx,ax
sti
pop dx
pop ax
ret
_everex:: ;Everex
push ax
push dx
push cx
mov cl,al
mov dx,3c4h
mov al,8
out dx,al
inc dl
in al,dx
dec dl
shl al,1
shr cl,1
rcr al,1
mov ah,al
mov al,8
out dx,ax
mov dl,0cch
in al,dx
mov dl,0c2h
and al,0dfh
shr cl,1
jc nob2
or al,20h
nob2: out dx,al
sti
pop cx
pop dx
pop ax
ret
_aheada:: ;Ahead Systems Ver A
push ax
push dx
push cx
mov ch,al
mov dx,3ceh ;Enable extended registers
mov ax,200fh
out dx,ax
mov dl,0cch ;bit 0
in al,dx
mov dl,0c2h
and al,11011111b
shr ch,1
jnc skpa
or al,00100000b
skpa: out dx,al
mov dl,0cfh ;bits 1,2,3
mov al,0
out dx,al
inc dx
in al,dx
dec dx
and al,11111000b
or al,ch
mov ah,al
mov al,0
out dx,ax
sti
pop cx
pop dx
pop ax
ret
_aheadb:: ;Ahead Systems Ver A
push ax
push dx
push cx
mov ch,al
mov dx,3ceh ;Enable extended registers
mov ax,200fh
out dx,ax
mov ah,ch
mov cl,4
shl ah,cl
or ah,ch
mov al,0dh
out dx,ax
sti
pop cx
pop dx
pop ax
ret
_oaktech:: ;Oak Technology Inc OTI-067
push ax
push dx
and al,15
mov ah,al
shl al,1
shl al,1
shl al,1
shl al,1
or ah,al
mov al,11h
mov dx,3deh
out dx,ax
sti
pop dx
pop ax
ret
_genoa:: ;GENOA GVGA
push ax
push dx
mov ah,al
shl al,1
shl al,1
shl al,1
or ah,al
mov al,6
or ah,40h
mov dx,3c4h
out dx,ax
sti
pop dx
pop ax
ret
_ncr:: ;NCR 77C22E
push ax
push dx
shl al,1 ;change 64k bank number into 16k bank number
shl al,1
mov ah,al
mov al,18h
mov dx,3c4h
out dx,ax
mov ax,19h
out dx,ax
sti
pop dx
pop ax
ret
_compaq:: ;Compaq
push ax
push dx
mov dx,3ceh
mov ax,50fh ;unlock extended registers
out dx,ax
mov ah,byte ptr OSEG[curbk]
shl ah,1 ;change 64k bank number into 4k bank number
shl ah,1
shl ah,1
shl ah,1
mov al,45h
out dx,ax
sti
pop dx
pop ax
ret
_vesa:: ;Vesa SVGA interface
push ax
push bx
push cx
push dx
mov cl,[vesashift]
shl ax,cl
mov dx,ax
xor bx,bx
mov ax,4f05h
int 10h
sti
pop dx
pop cx
pop bx
pop ax
ret
_nobank::
sti
ret
newbank endp
bkadr macro func
mov [func],1
mov [bankadr],offset _&func
if @Codesize
mov [bankseg],seg _&func
endif
endm
nojmp macro
local lbl
jmp lbl
lbl:
endm
whichvga proc uses si di
local vesabuf[256]:byte
cmp [first],'FI'
jnz gotest
mov ax,[retval]
ret
gotest: mov [bankadr],offset _nobank
if @Codesize
mov [bankseg],seg _nobank
endif
xor ax,ax
mov [curbk],ax
mov [vga512],ax
mov [vga1024],ax
mov [cirrus],ax
mov [everex],ax
mov [paradise],ax
mov [tseng],ax
mov [trident],ax
mov [t8900],ax
mov [ativga],ax
mov [aheada],ax
mov [aheadb],ax
mov [oaktech],ax
mov [video7],ax
mov [chipstech],ax
mov [tseng4],ax
mov [genoa],ax
mov [ncr],ax
mov [compaq],ax
mov [vesa],ax
mov [first],'FI'
mov ax,ss
mov es,ax
lea di,vesabuf[0]
mov ax,4f00h
int 10h
cmp ax,4fh
jnz novesa
lea si,vesabuf[0]
mov di,offset vgainfo
mov ax,ds
mov es,ax
push ds
mov ax,ss
mov ds,ax
mov cx,7
cld
rep movsw
pop ds
bkadr vesa
mov [vga512],1
mov [vga1024],1
; jmp fini
novesa: mov si,1
mov ax,0c000h
mov es,ax
cmp word ptr es:[40h],'13' ;ATI Signiture on the Video BIOS
jnz noati
bkadr ativga
cli
mov dx,1ceh
mov al,0bbh
out dx,al
inc dl
in al,dx
sti
and al,20h
jz no512
mov [vga512],1
no512: jmp fini
noati: mov ax,7000h ;Test for Everex
xor bx,bx
cld
int 10h
cmp al,70h
jnz noev
bkadr everex
and ch,11000000b ;how much memory on board
jz skp
mov [vga512],1
skp: ;fall through for Everex boards using Trident or Tseng4000
noev: mov ax,0bf03h ;Test for Compaq
xor bx,bx
mov cx,bx
int 10h
cmp ax,0bf03h
jnz nocp
test cl,40h ;is 640x480x256 available?
jz nocp
bkadr compaq
mov [vga512],1
jmp fini
nocp: mov dx,3c4h ;Test for NCR 77C22E
mov ax,0ff05h
call _isport2
jnz noncr
mov ax,5 ;Disable extended registers
out dx,ax
mov ax,0ff10h ;Try to write to extended register 10
call _isport2 ;If it writes then not NCR
jz noncr
mov ax,105h ;Enable extended registers
out dx,ax
mov ax,0ff10h
call _isport2
jnz noncr ;If it does NOT write then not NCR
bkadr ncr
mov [vga512],1
jmp fini
noncr: mov dx,3c4h ;Test for Trident
mov al,0bh
out dx,al
inc dl
in al,dx
cmp al,06h
ja notri
cmp al,2
jb notri
bkadr trident
cmp al,3
jb no89
mov [t8900],1
mov dx,3d5h
mov al,1fh
out dx,al
inc dx
in al,dx
and al,3
cmp al,1
jb notmem
mov [vga512],1
je notmem
mov [vga1024],1
notmem: jmp fini
no89: mov [vga512],1
jmp fini
notri: mov ax,6f00h ;Test for Video 7
xor bx,bx
cld
int 10h
cmp bx,'V7'
jnz nov7
bkadr video7
mov ax,6f07h
cld
int 10h
and ah,7fh
cmp ah,1
jbe skp2
mov [vga512],1
skp2: cmp ah,3
jbe skp3
mov [vga1024],1
skp3: jmp fini
nov7: mov dx,3d4h ;Test for GENOA GVGA
mov ax,032eh ;check for Herchi Register
call _isport2
jnz nogn
mov dx,3c4h ;check for memory segment register
mov ax,3f06h
call _isport2
jnz nogn
bkadr genoa
mov [vga512],1
jmp fini
nogn: call _cirrus ;Test for Cirrus
cmp [cirrus],0
je noci
jmp fini
noci: mov dx,3ceh ;Test for Paradise
mov al,9 ;check Bank switch register
out dx,al
inc dx
in al,dx
dec dx
or al,al
jnz nopd
mov ax,50fh ;turn off write protect on VGA registers
out dx,ax
mov dx,offset _pdrsub
mov cx,1
call _chkbk
jc nopd ;if bank 0 and 1 same not paradise
bkadr paradise
mov dx,3ceh
mov al,0bh ;512k detect from Bob Berry
out dx,al
inc dx
in al,dx
test al,80h ;if top bit set then 512k
jz nop512
mov [vga512],1
nop512: jmp fini
nopd: mov ax,5f00h ;Test for Chips & Tech
xor bx,bx
cld
int 10h
cmp al,5fh
jnz noct
bkadr chipstech
cmp bh,1
jb skp4
mov [vga512],1
skp4: jmp fini
noct: mov ch,0
mov dx,3d4h ;check for Tseng 4000 series
mov ax,0f33h
call _isport2
jnz not4
mov ch,1
mov dx,3bfh ;Enable access to extended registers
mov al,3
out dx,al
mov dx,3d8h
mov al,0a0h
out dx,al
jmp short yes4
not4: mov dx,3d4h ;Test for Tseng 3000 or 4000
mov ax,1f25h ;is the Overflow High register there?
call _isport2
jnz nots
mov al,03fh ;bottom six bits only
jmp short yes3
yes4: mov al,0ffh
yes3: mov dx,3cdh ;test bank switch register
call _isport1
jnz nots
bkadr tseng
cmp ch,0
jnz t4mem
mov [vga512],1
jmp fini
t4mem: mov dx,3d4h ;Tseng 4000 memory detect 1meg
mov al,37h
out dx,al
inc dx
in al,dx
test al,1000b ;if using 64kx4 RAMs then no more than 256k
jz nomem
and al,3
cmp al,1 ;if 8 bit wide bus then only two 256kx4 RAMs
jbe nomem
mov [vga512],1
cmp al,2 ;if 16 bit wide bus then four 256kx4 RAMs
je nomem
mov [vga1024],1 ;full meg with eight 256kx4 RAMs
nomem: bkadr tseng4
jmp short fini
nots:
mov dx,3ceh ;Test for Above A or B chipsets
mov ax,200fh
out dx,ax
inc dx
nojmp
in al,dx
cmp al,21h
jz verb
cmp al,20h
jnz noab
bkadr aheada
mov [vga512],1
jmp short fini
verb: bkadr aheadb
mov [vga512],1
jmp short fini
noab: mov dx,3deh ;Test for Oak Technology
mov ax,0ff11h ;look for bank switch register
call _isport2
jnz nooak
bkadr oaktech
mov al,0dh
out dx,al
inc dx
nojmp
in al,dx
test al,80h
jz no4ram
mov [vga512],1
no4ram: jmp short fini
nooak: mov si,0
fini: mov ax,si
mov [retval],ax
ret
whichvga endp
_cirrus proc near
mov dx,3d4h ; assume 3dx addressing
mov al,0ch ; screen a start address hi
out dx,al ; select index
inc dx ; point to data
mov ah,al ; save index in ah
in al,dx ; get screen a start address hi
xchg ah,al ; swap index and data
push ax ; save old value
push dx ; save crtc address
xor al,al ; clear crc
out dx,al ; and out to the crtc
mov al,1fh ; Eagle ID register
dec dx ; back to index
out dx,al ; select index
inc dx ; point to data
in al,dx ; read the id register
mov bh,al ; and save it in bh
mov cl,4 ; nibble swap rotate count
mov dx,3c4h ; sequencer/extensions
mov bl,6 ; extensions enable register
ror bh,cl ; compute extensions disable value
mov ax,bx ; extensions disable
out dx,ax ; disable extensions
inc dx ; point to data
in al,dx ; read enable flag
or al,al ; disabled ?
jnz exit ; nope, not an cirrus
ror bh,cl ; compute extensions enable value
dec dx ; point to index
mov ax,bx ; extensions enable
out dx,ax ; enable extensions
inc dx ; point to data
in al,dx ; read enable flag
cmp al,1 ; enabled ?
jne exit ; nope, not an cirrus
mov [cirrus],1
mov [bankadr],offset _nobank
if @Codesize
mov [bankseg],seg _nobank
endif
exit: pop dx ; restore crtc address
dec dx ; point to index
pop ax ; recover crc index and data
out dx,ax ; restore crc value
ret
_cirrus endp
_chkbk proc near ;bank switch check routine
mov di,0b800h
mov es,di
xor di,di
mov bx,1234h
call _gochk
jnz badchk
mov bx,4321h
call _gochk
jnz badchk
clc
ret
badchk: stc
ret
_chkbk endp
_gochk proc near
push si
mov si,bx
mov al,cl
call dx
xchg bl,es:[di]
mov al,ch
call dx
xchg bh,es:[di]
xchg si,bx
mov al,cl
call dx
xor bl,es:[di]
mov al,ch
call dx
xor bh,es:[di]
xchg si,bx
mov al,ch
call dx
mov es:[di],bh
mov al,cl
call dx
mov es:[di],bl
mov al,0
call dx
or si,si
pop si
ret
_gochk endp
_pdrsub proc near ;Paradise
push dx
mov ah,al
mov dx,3ceh
mov al,9
out dx,ax
pop dx
ret
_pdrsub endp
_isport2 proc near
push bx
mov bx,ax
out dx,al
mov ah,al
inc dx
in al,dx
dec dx
xchg al,ah
push ax
mov ax,bx
out dx,ax
out dx,al
mov ah,al
inc dx
in al,dx
dec dx
and al,bh
cmp al,bh
jnz noport
mov al,ah
mov ah,0
out dx,ax
out dx,al
mov ah,al
inc dx
in al,dx
dec dx
and al,bh
cmp al,0
noport: pop ax
out dx,ax
pop bx
ret
_isport2 endp
_isport1 proc near
mov ah,al
in al,dx
push ax
mov al,ah
out dx,al
in al,dx
and al,ah
cmp al,ah
jnz noport
mov al,0
out dx,al
in al,dx
and al,ah
cmp al,0
noport: pop ax
out dx,al
ret
_isport1 endp
end