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- ;--------------------------------------------------------------------------
- ; This is file ACUMOS.ASM
- ;
- ; Copyright (C) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
- ; Copyright (C) 1992 Csaba Biegl, 820 Stirrup Dr, Nashville, TN 37221
- ; Copyright (C) 1993 Hartmut Schirmer, Feldstr. 118, 2300 Kiel 1, Germany
- ; Copyright (C) 1993 Matthias Burian, Imhoffg. 6, 2232 Strasshof, Austria
- ;
- ; 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.
- ;--------------------------------------------------------------------------
- ;
- ; This is the graphics driver for AcuMos AVGA2 chipsets
- ; It has been derived from Hartmut Schirmers CIRRUS54.GRN
- ; and the STDVGA.GRN graphics driver by Csaba Biegl/DJ Delorie
- ;
- .386
- include grdriver.inc
- cseg segment use16 byte public 'code'
- assume cs:cseg, ds:cseg, es:cseg, ss:nothing
-
-
- ;--------------------------------------------------------------------------
- ; DRIVER HEADER
- ; The following entries MUST match the structure and constant
- ; declarations in the file 'grdriver.h' of the GRX graphics library
- ; The mode word should contain the following bitfields:
- ; - the GRD_NEW_DRIVER bit set for any new format driver
- ; - the adapter type field should be specified
- ; - the memory size field should be specified
- ; - the paging mode field should be specified
- ; The mode set routine will OR in the plane bitfield as it will
- ; change when different color number modes are requested.
- ;--------------------------------------------------------------------------
-
- dw offset mode_set_routine
- dw offset paging_routine
- mode_W dw GRD_NEW_DRIVER+GRD_VGA+GRD_1024K+GRD_NO_RW
- ;
- ; The 'def_xx' fields are filled in by go32 from the corresponding
- ; fields of the 'GO32' environment variable
- ;
- def_tw dw 80 ; text width
- def_th dw 25 ; text height
- def_gw dw 640 ; graphics width
- def_gh dw 480 ; graphics height
- 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 50
- 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, 50, 16, 003h + 00100h
- dw 132, 25, 16, 055h + 00000h
- dw 132, 43, 16, 054h + 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, 480, 256, 05fh + 00000h
- dw 800, 600, 256, 05ch + 00000h
- dw 0, 0, 0, 000h + 00000h
-
- ; The AcuMos AVGA2 SVGA card supports two 'native' VESA modes,
- ; 640x480x256 colors. They can be accessed by the 'standard extended' modes,
- ; so I omitted VESA support
- ;
- ;--------------------------------------------------------------------------
- ; 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 offset VGA_50row_mode_set
-
- ;
- ; Routine to set up VGA 50 row mode
- ; interface is described above
- ;
- VGA_50row_mode_set proc near
- mov ax,03h ; set 80x25 mode
- int 10h
- xor bx,bx
- mov ax,1112h ; load 8x8 font
- int 10h
- ret
- VGA_50row_mode_set endp
-
-
- ;--------------------------------------------------------------------------
- ; 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 ; Really primitive, but works
- ret ; Make sure you've an GD542X Chip !
- driver_init_routine endp
-
-
- ;--------------------------------------------------------------------------
- ; MODE SET ROUTINE
- ; sets up a text or graphics mode as close as possible to the one
- ; reguested by the user with regard to number of colors and size.
- ;
- ; 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
- ; 9 = graphics BX colors, CX width by DX height
- ;
- ; Exit: BX=driver mode flag
- ; CX=width (in pixels or characters)
- ; DX=height
- ;
- ; NOTE: This runs in real mode, but don't mess with the segment registers.
- ; YOU SHOULD NOT NEED TO CHANGE THIS ROUTINE AS IT IS PRETTY
- ; MUCH TABLE DRIVEN
- ;--------------------------------------------------------------------------
- mode_set_routine proc far
- push ds
- push di
- push si
- mov si,cs
- mov ds,si
- cmp ax,9
- jbe DoIt
- jmp Exit
- DoIt: add ax,ax
- mov si,ax
- jmp WORD PTR mode_set_table[si]
- mode_set_table label word
- dw offset mode_0
- dw offset mode_1
- dw offset mode_2
- dw offset mode_3
- dw offset mode_4
- dw offset mode_5
- dw offset mode_6
- dw offset mode_7
- dw offset mode_8
- dw offset mode_9
- mode_0: mov si,offset text_mode_table ; 80x25 text
- mov bx,def_nc
- mov cx,80
- mov dx,25
- jmp Lookup
- mode_1: mov si,offset text_mode_table ; default text
- mov bx,def_nc
- mov cx,def_tw
- mov dx,def_th
- jmp Lookup
- mode_2: mov si,offset text_mode_table ; CX*DX text
- mov bx,def_nc
- jmp Lookup
- mode_3: mov si,offset text_mode_table ; biggest text
- mov bx,def_nc
- mov cx,Max_TW
- mov dx,Max_TH
- jmp Lookup
- mode_4: mov si,offset graphics_mode_table ; 320x200 graphics
- mov bx,def_nc
- mov cx,320
- mov dx,200
- jmp Lookup
- mode_5: mov si,offset graphics_mode_table ; default graphics
- mov bx,def_nc
- mov cx,def_gw
- mov dx,def_gh
- jmp Lookup
- mode_6: mov si,offset graphics_mode_table ; CX*DX graphics
- mov bx,def_nc
- jmp Lookup
- mode_7: mov si,offset graphics_mode_table ; biggest non-interlaced gr
- mov bx,def_nc
- mov cx,Max_GWn
- mov dx,Max_GHn
- jmp Lookup
- mode_8: mov si,offset graphics_mode_table ; biggest graphics
- mov bx,def_nc
- mov cx,Max_GW
- mov dx,Max_GH
- jmp Lookup
- mode_9: mov si,offset graphics_mode_table ; CX*DX graphics w/ BX colors
- ;
- ; At this point:
- ; SI points to the table to search (text or graphics)
- ; BX has colors
- ; CX has width
- ; DX has height
- ;
- Lookup: xor ax,ax ; last color number seen
- Find_C: cmp [si+4],ax ; last color number == this?
- je Same_C
- jb Prev_C ; end of table -- use last color
- cmp BYTE PTR [si+6],0ffh ; valid entry ?
- je Prev_C ; not -- use last color
- mov ax,[si+4] ; record color number
- mov di,si ; start of entries w/ this color
- cmp ax,bx ; enough colors ?
- jae Find_S
- Same_C: add si,8
- jmp Find_C
- Prev_C: or ax,ax ; found any color at all?
- je Exit
- ;
- ; At this point:
- ; DI points into the table to the first entry with the desired color
- ; number (either it has enough colors or it is the highest color
- ; number supported by the driver). Additionally, at least the
- ; first (= smallest size) entry for this color is valid (has a
- ; valid BIOS number).
- ; AX has the color number adjusted for the driver
- ; CX has width
- ; DX has height
- ;
- Find_S: cmp [di+4],ax ; still the same color #?
- jne Prev_S
- cmp BYTE PTR [di+6],0ffh ; valid entry ?
- je Prev_S
- cmp [di],cx
- jb Next_S
- cmp [di+2],dx
- jae GotIt
- Next_S: add di,8
- jmp Find_S
- Prev_S: sub di,8
- ;
- ; At this point:
- ; DI points to the table entry we want to set up
- ;
- GotIt: mov ax,[di+6] ; BIOS mode number
- or ah,ah ; special ?
- je doBIOS
- mov al,ah
- xor ah,ah
- dec ax
- add ax,ax
- mov si,ax
- call WORD PTR special_setup_table[si]
- jmp RetVal
- doBIOS: int 10h
- mov bx,GRD_1_PLANE
- cmp WORD PTR [di+4],2 ; 2 colors ?
- je doFLAG
- mov bx,GRD_4_PLANES
- cmp WORD PTR [di+4],16 ; 16 colors ?
- je doFLAG
- mov bx,GRD_8_PLANES
- cmp WORD PTR [di+4],256 ; 256 colors ?
- je doFLAG
- mov bx,GRD_16_PLANES
- cmp WORD PTR [di+4],32768 ; 32K colors ?
- je doFLAG
- mov bx,GRD_PLANE_MASK ; something is wrong!!
- doFLAG: or bx,mode_W
- RetVal: mov cx,[di]
- mov dx,[di+2]
- Exit: pop si
- pop di
- pop ds
- ret
- mode_set_routine endp
-
-
- ;--------------------------------------------------------------------------
- ; PAGING ROUTINE
- ;
- ; Entry: AH=read page
- ; AL=write page
- ;
- ; Exit: VGA configured.
- ; AX,BX,CX,DX,SI,DI may be trashed
- ;
- ; NOTE: This runs in protected mode! Don't mess with the segment registers!
- ; This code must be relocatable and may not reference any data!
- ;--------------------------------------------------------------------------
- assume ds:nothing, es:nothing
-
- paging_routine proc far
- shl ah,4
- mov dx,03ceh
- mov al,9
- out dx,al
- inc dx
- mov al,ah
- out dx,al
-
- mov al,8 ; reconfig GR CTRL port for mask writes
- dec dx
- out dx,al
- ret
- paging_routine endp
-
-
- cseg ends
- end