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;---------------------------Module-Header------------------------------;; Module Name: vgaregs.asm;; Copyright (c) 1992 Microsoft Corporation;-----------------------------------------------------------------------;;-----------------------------------------------------------------------;; VOID vInitRegs(void);; Sets the VGA's data control registers to their default states.;;-----------------------------------------------------------------------;
.386
.model small,c
assume cs:FLAT,ds:FLAT,es:FLAT,ss:FLAT assume fs:nothing,gs:nothing
.xlist include stdcall.inc ;calling convention cmacros include i386\strucs.inc include i386\driver.inc include i386\egavga.inc
.list
.code
cProc vInitRegs,4,< \ uses esi edi ebx, \ ppdev: ptr PDEV >
mov esi,ppdev
; Initialize sequencer to its defaults (all planes enabled, index; pointing to Map Mask).
mov dx,VGA_BASE + SEQ_ADDR mov ax,(MM_ALL shl 8) + SEQ_MAP_MASK out dx,ax
; Initialize graphics controller to its defaults (set/reset disabled for; all planes, no rotation & ALU function == replace, write mode 0 & read; mode 0, color compare ignoring all planes (read mode 1 reads always; return 0ffh, handy for ANDing), and the bit mask == 0ffh, gating all; bytes from the CPU.
mov dl,GRAF_ADDR mov ax,(0 shl 8) + GRAF_ENAB_SR out dx,ax
mov ax,(DR_SET shl 8) + GRAF_DATA_ROT out dx,ax
; Default to read mode 0, write mode 0:
mov edx,VGA_BASE + GRAF_ADDR mov ah,byte ptr [esi].pdev_ulrm0_wmX[0] mov al,GRAF_MODE out dx,ax ;write mode 0, read mode 0
mov ax,(0 shl 8) + GRAF_CDC out dx,ax
mov ax,(0FFh shl 8) + GRAF_BIT_MASK out dx,ax
cRet vInitRegs
endProc vInitRegs
;-----------------------------------------------------------------------;; VOID vSetWriteModes(ULONG * pulWriteModes);;; Sets the four bytes at *pulWriteModes to the values to be written to; the Graphics Mode register to select read mode 0 and:; write mode 0, write mode 1, write mode 2, and write mode 3,; respectively.;; Must already be in graphics mode when this is called.;-----------------------------------------------------------------------;
cProc vSetWriteModes,4,< \ pulWriteModes:ptr >
mov edx,VGA_BASE + GRAF_ADDR mov al,GRAF_MODE out dx,al ;point the GC Index to the Graphics Mode reg inc edx ;point to the GC Data reg in al,dx ;get the current setting of the Graphics Mode and eax,0fch ;mask off the write mode fields mov ah,al mov edx,eax shl edx,16 or eax,edx ;put the Graphics Mode setting in all 4 bytes mov edx,pulWriteModes ;the mode values go here or eax,03020100h ;insert the write mode fields mov [edx],eax ;store the Graphics Mode settings
cRet vSetWriteModes
endProc vSetWriteModes
end
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