Libris Britannia 4/science library(b).zip/science library(b)/PROGRAMM/CC_C/H001C.ZIP/DJGPP3.ZIP/DRIVERS/ATI.ASM

Assembly Source File | 1991-03-15 | 5KB | 212 lines

; This is file ATIVGA.ASM
;
; Copyright (C) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
;
; This file is distributed under the terms listed in the document
; "copying.dj", available from DJ Delorie at the address above.
; A copy of "copying.dj" should accompany this file; if not, a copy
; should be available from where this file was obtained.  This file
; may not be distributed without a verbatim copy of "copying.dj".
;
; This file is distributed WITHOUT ANY WARRANTY; without even the implied
; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
;
;
; Modify for the ATI VGA WONDER
; by Luc Bussieres, [e-mail]
; University of Sherbrooke
; March 9th, 1991
;

cseg    segment    byte public 'code'
    assume    cs:cseg, ds:cseg, es:cseg, ss:nothing

    dw    offset init_routine
    dw    offset paging_routine
        dw      0       ; set to 1 if separate read & write windows or
            ; only 64K of video RAM (ie: no paging)

def_tw    dw    80    ; filled in by go32 if GO32 env. var. is set
def_th    dw    25
def_gw  dw      640
def_gh  dw      480

;--------------------------------------------------------------------------
; Entry: AX=mode selection
;        0=80x25 text
;        1=default text
;        2=text CX cols by DX rows
;        3=biggest text
;        4=320x200 graphics
;        5=default graphics
;        6=graphics CX width by DX height
;        7=biggest non-interlaced graphics
;        8=biggest graphics
;
; NOTE: This runs in real mode, but don't mess with the segment registers.
;
; Exit:  CX=width (in pixels or characters)
;        DX=height

init_table    label    word
    dw    offset init_0
    dw    offset init_1
    dw    offset init_2
    dw    offset init_3
    dw    offset init_4
    dw    offset init_5
    dw    offset init_6
    dw    offset init_7
    dw    offset init_8

init_routine    proc    far
    cmp    ax,8
    jbe    valid_req
    ret
valid_req:
    shl    ax,1
    mov    bx,ax
    jmp    init_table[bx]

init_0: ; 80x25 text
    mov    ax,3
    int    10h
    mov    cx,80
    mov    dx,25
    ret

init_1: ; default text
    mov    cx,def_tw
    mov    dx,def_th
    jmp    init_2

init_2_table    label    word
    dw    01h, 40, 25
    dw    03h, 80, 25
        dw      23h, 132, 25
        dw      33h, 132, 44
init_2_tend    label    word

init_2: ; CX*DX text
    mov    si,offset init_2_table
init_2a:
    cmp    [si+2],cx
    jb    init_2b
    cmp    [si+4],dx
    jb    init_2b
    ; got a big enough one!
    jmp    init_2c
init_2b:
    cmp    si,offset init_2_tend - 6
    je    init_2c
    add    si,6
    jmp    init_2a
init_2c:
    mov    ax,[si]
    push    si
    int    10h
    pop    si
    mov    cx,[si+2]
    mov    dx,[si+4]
    ret

init_3: ; biggest text
    mov    ax,[init_2_tend-6]
    int    10h
    mov    cx,[init_2_tend-4]
    mov    dx,[init_2_tend-2]
    ret

init_4: ; 320x200 graphics
    mov    ax,13h
    int    10h
    mov    cx,320
    mov    dx,200
    ret

init_5: ; default graphics - should be 640x480 if supported
    mov    cx,def_gw
    mov    dx,def_gh
    jmp    init_6

init_6_table    label    word
    dw    13h, 320, 200
        dw      61h, 640, 400
        dw      62h, 640, 480
        dw      63h, 800, 600
init_6_tend    label    word

init_6: ; CX*DX graphics
    mov    si,offset init_6_table
init_6a:
    cmp    [si+2],cx
    jb    init_6b
    cmp    [si+4],dx
    jb    init_6b
    ; got a big enough one!
    jmp    init_6c
init_6b:
    cmp    si,offset init_6_tend - 6
    je    init_6c
    add    si,6
    jmp    init_6a
init_6c:
    mov    ax,[si]
    push    si
    int    10h
    pop    si
    mov    cx,[si+2]
    mov    dx,[si+4]
    ret

init_7: ; biggest non-interlaced graphics
        mov     ax,63h
    int    10h
        mov     cx,800
        mov     dx,600
    ret

init_8: ; biggest graphics
        mov     ax,63h
    int    10h
        mov     cx,800
        mov     dx,600
    ret

init_routine    endp

;--------------------------------------------------------------------------
; Entry: AH=read page
;        AL=write page
;
; NOTE: This runs in protected mode!  Don't mess with the segment registers!
; This code must be relocatable and may not reference any data!
;
; Exit: VGA configured.
;       AX,BX,CX,DX,SI,DI may be trashed

    assume    ds:nothing, es:nothing

paging_routine    proc    far
        and     al,07h
        mov     ch,al          ; ch is page number
        mov     dx,01ceh       ; ati register
        mov     al,0b2h        ; plane select
        out     dx,al
        inc     dl
        in      al,dx
        mov     ah,al
        and     ah,0e1h        ; plane mask
        shl     ch,1
        or      ah,ch
        mov     al,0b2h        ; plane select
        dec     dl
        out     dx,ax
    ret
paging_routine    endp

;--------------------------------------------------------------------------

cseg    ends
    end