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CIRRUS54.ASM
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Assembly Source File
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1993-11-21
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16KB
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432 lines
;--------------------------------------------------------------------------
; This is file CIRRUS.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 Ben Jos Walbeehm, Lijsterbeslaan 20, 5248 BB Rosmalen,
; Netherlands
;
; 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.
;--------------------------------------------------------------------------
; 64K mode added by J.Dittrich dittrich@ifk20.mach.uni-karlsruhe.de
; 16M mode doesn't work! ***!!!*** But it does! See below (BJW).
;--------------------------------------------------------------------------
; A number of modes (the 2Mb-video-RAM modes amongst others) added by
; B.J. Walbeehm (Walbeehm@fsw.ruu.nl).
;
; NOTE: The 16M mode can be made to work properly when using DISP V1.57
; ===== or better! To accomplish this, put the following two lines in the
; "Bytes per line scan table for TrueColour Mode" (see CONFIG.DIS):
; bytes_per_line_true=0,2048
; bytes_per_line_true=3,2048
;--------------------------------------------------------------------------
;
; This driver supports Cirrus CL-GD542X Chipsets
; Check your BIOS documentation if all of below modes are supported !
;
include grdriver.inc
cseg segment 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 1280 ; may be interlaced
Max_GH equ 1024
;--------------------------------------------------------------------------
; 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 ; also: mode 000h
dw 40, 50, 16, 001h + 00100h ; also: mode 000h *
dw 80, 25, 16, 003h + 00000h ; also: mode 002h
dw 80, 50, 16, 003h + 00100h ; also: mode 002h *
dw 132, 25, 16, 014h + 00000h ; also: mode 055h
dw 132, 43, 16, 054h + 00000h
dw 132, 50, 16, 014h + 00100h ; also: mode 055h *
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 640, 200, 2, 006h + 00000h
dw 640, 350, 2, 00fh + 00000h
dw 640, 480, 2, 011h + 00000h
dw 320, 200, 4, 005h + 00000h
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 ; also: mode 06ah
dw 1024, 768, 16, 05dh + 00000h
dw 1280, 1024, 16, 06ch + 00000h
dw 320, 200, 256, 013h + 00000h
dw 640, 480, 256, 05fh + 00000h
dw 800, 600, 256, 05ch + 00000h
dw 1024, 768, 256, 060h + 00000h
TwoMegMode1 label word
dw 1280, 1024, 256, 06dh + 00000h ; requires 2 Mb !!!
dw 640, 480, 32768, 066h + 00000h
dw 800, 600, 32768, 067h + 00000h
dw 320, 200, 0c010h, 06fh + 00000h
dw 640, 480, 0c010h, 064h + 00000h
dw 800, 600, 0c010h, 065h + 00000h
TwoMegMode2 label word
dw 1024, 768, 0c010h, 074h + 00000h ; requires 2 Mb !!!
; To use the 16M modes, see note above (BJW)
dw 320, 200, 0c018h, 070h + 00000h
dw 640, 480, 0c018h, 071h + 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 offset VGA_50row_mode_set
;
; Routine to set up VGA 50 row mode
; interface is described above
;
VGA_50row_mode_set proc near
mov al,[di+6] ; set 40x25 or 80x25 or 132x25 mode
xor ah,ah
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 l