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drvsrc
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sparadis.asm
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Assembly Source File
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1993-08-24
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8KB
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324 lines
;--------------------------------------------------------------------------
; This is file SPARADIS.ASM
;
; Copyright (C) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
; Copyright (C) 1992 Csaba Biegl, 820 Stirrup Dr, Nashville, TN 37221
; # Modified June 1993 by Nick van der Merwe , Department of Surveying
; University of Cape Town , South Africa
; changes made: SVGA support
;
; 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.
;--------------------------------------------------------------------------
;include grdriver.inc?
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
def_nc dw 16 ;graphics colors
dw offset driver_init_routine
dw offset text_mode_table
dw offset graphics_mode_table
;
; Biggest text and graphics sizes
;
Max_TW equ 132
Max_TH equ 44
Max_GWn equ 800 ; non interlaced!!!
Max_GHn equ 600
Max_GW equ 1024 ; may be interlaced
Max_GH equ 768
;--------------------------------------------------------------------------
; TABLE OF SUPPORTED TEXT MODES
; - keep sorted by size
; - end with an all 0 entry
; - BIOS field = 0xff disables it
; - fields:
; width, height, colors, BIOS#+ setup_procedure_index*256
;--------------------------------------------------------------------------
text_mode_table label word
dw 80, 25, 2, 007h + 00000h
dw 40, 25, 16, 001h + 00000h
dw 80, 25, 16, 003h + 00000h
dw 80, 30, 16, 012h + 00000h
dw 80, 34, 16, 041h + 00000h
;dw 80, 60, 16, 052h + 00000h
dw 132, 25, 16, 055h + 00000h
dw 132, 28, 16, 047h + 00000h
dw 132, 44, 16, 021h + 00000h
dw 40, 25, 256, 056h + 00000h
dw 0, 0, 0, 000h + 00000h
;--------------------------------------------------------------------------
; TABLE OF SUPPORTED GRAPHICS MODES
; - keep sorted first by colors then by size
; - end with an all 0 entry
; - BIOS field = 0xff disables it
; - fields:
; width, height, colors, BIOS#+ setup_procedure_index*256
;--------------------------------------------------------------------------
graphics_mode_table label word
dw 320, 200, 16, 00dh + 00000h
dw 640, 200, 16, 00eh + 00000h
dw 640, 350, 16, 010h + 00000h
dw 640, 480, 16, 012h + 00000h
dw 800, 600, 16, 058h + 00000h
dw 1024, 768, 16, 05dh + 00000h
dw 320, 200, 256, 013h + 00000h
dw 640, 400, 256, 05eh + 00000h
dw 640, 480, 256, 05fh + 00000h
dw 800, 600, 256, 05ch + 00000h
dw 1024, 768, 256, 060h + 00000h
dw 0, 0, 0, 000h + 00000h
;--------------------------------------------------------------------------
; TABLE OF SPECIAL SETUP PROCEDURES
; You may need such procedures for:
; -- reloading fonts on standard EGA or VGA for
; higher resolution text modes
; -- enable HiColor mode of some Super VGAs
; -- Handle the parameter passing conventions of the VESA BIOS
; -- put VGA into 256 color plane mode ("MODE X")
; -- etc...
; There should be one entry in the table for every non-zero
; 'setup_procedure_index' in the text and graphics mode tables.
; The first entry in the table belongs to index 100h, and so on.
; The special setup procedure is invoked via a near call.
;
; Entry: DI=address of the mode record from the text or graphics
; table to set up.
;
; Exit: Adapter configured
; BX=driver mode word as it should be returned by the mode set
; routine. Typically it involves picking up the mode word
; from the header and OR-ing in the appropriate bitplane mode
; bitfield. (This is not needed for text modes)
; AX, CX, DX, SI can be trashed, PRESERVE DI!!!!
;
; NOTE: This runs in real mode, but don't mess with the segment registers.
;--------------------------------------------------------------------------
special_setup_table label word
dw 0 ; none here !!
;--------------------------------------------------------------------------
; DRIVER INIT ROUTINE
; called once after the driver is loaded
; may do one or more of the followings:
; - check for proper board type
; - check amount of RAM on board, and:
; -- update word in header to reflect correct amount
; -- disable modes in the tables for which there is not enough RAM
; - check for special equipment (HiColor DAC, etc...)
;
; Entry: nothing
;
; Exit: AX=status:
; non-zero: OK,
; 0: something went wrong (e.g. wrong adapter, etc..)
; BX,CX,DX may be trashed
;
; NOTE: This runs in real mode, but don't mess with the segment registers.
;--------------------------------------------------------------------------
driver_init_routine proc far
mov ax,1
ret
driver_init_routine endp
;--------------------------------------------------------------------------
; 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
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 5eh, 640, 400
dw 5fh, 640, 480
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,5fh
int 10h
mov cx,640
mov dx,480
ret
init_8: ; biggest graphics
mov ax,5fh
int 10h
mov cx,640
mov dx,480
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
;
; Derived from code from VGAKIT Version 3.4
; Copyright 1988,89,90 John Bridges
assume ds:nothing, es:nothing
paging_routine proc far
mov cx,ax
mov dx,3ceh
mov ax,50fh ;turn off write protect on VGA registers
out dx,ax
mov ah,cl
shl ah,1
shl ah,1
shl ah,1
shl ah,1
mov al,9
out dx,ax
ret
paging_routine endp
;--------------------------------------------------------------------------
cseg ends
end