Return to vgaregs.asm CVS log

Up to [WindowsNT SDKs] / ntddk / src / video / displays / vga256 / i386

Annotation of ntddk/src/video/displays/vga256/i386/vgaregs.asm, revision 1.1.1.1

1.1       root        1: ;---------------------------Module-Header------------------------------;
                      2: ; Module Name: vgaregs.asm
                      3: ;
                      4: ; Copyright (c) 1992 Microsoft Corporation
                      5: ;-----------------------------------------------------------------------;
                      6: ;-----------------------------------------------------------------------;
                      7: ; VOID vInitRegs(void)
                      8: ;
                      9: ; Sets the VGA's data control registers to their default states.
                     10: ;
                     11: ;-----------------------------------------------------------------------;
                     12: 
                     13:         .386
                     14: 
                     15:         .model  small,c
                     16: 
                     17:         assume cs:FLAT,ds:FLAT,es:FLAT,ss:FLAT
                     18:         assume fs:nothing,gs:nothing
                     19: 
                     20:         .xlist
                     21:         include stdcall.inc             ;calling convention cmacros
                     22:         include i386\strucs.inc
                     23:         include i386\driver.inc
                     24:         include i386\egavga.inc
                     25: 
                     26:         .list
                     27: 
                     28:         .code
                     29: 
                     30: cProc vInitRegs,4,<             \
                     31:         uses esi edi ebx,       \
                     32:         ppdev: ptr PDEV         >
                     33: 
                     34:         mov     esi,ppdev
                     35: 
                     36: ;       Initialize sequencer to its defaults (all planes enabled, index
                     37: ;       pointing to Map Mask).
                     38: 
                     39:         mov     dx,VGA_BASE + SEQ_ADDR
                     40:         mov     ax,(MM_ALL shl 8) + SEQ_MAP_MASK
                     41:         out     dx,ax
                     42: 
                     43: ;       Initialize graphics controller to its defaults (set/reset disabled for
                     44: ;       all planes, no rotation & ALU function == replace, write mode 0 & read
                     45: ;       mode 0, color compare ignoring all planes (read mode 1 reads always
                     46: ;       return 0ffh, handy for ANDing), and the bit mask == 0ffh, gating all
                     47: ;       bytes from the CPU.
                     48: 
                     49:         mov     dl,GRAF_ADDR
                     50:         mov     ax,(0 shl 8) + GRAF_ENAB_SR
                     51:         out     dx,ax
                     52: 
                     53:         mov     ax,(DR_SET shl 8) + GRAF_DATA_ROT
                     54:         out     dx,ax
                     55: 
                     56: ;       Default to read mode 0, write mode 0:
                     57: 
                     58:         mov     edx,VGA_BASE + GRAF_ADDR
                     59:         mov     ah,byte ptr [esi].pdev_ulrm0_wmX[0]
                     60:         mov     al,GRAF_MODE
                     61:         out     dx,ax                   ;write mode 0, read mode 0
                     62: 
                     63:         mov     ax,(0 shl 8) + GRAF_CDC
                     64:         out     dx,ax
                     65: 
                     66:         mov     ax,(0FFh shl 8) + GRAF_BIT_MASK
                     67:         out     dx,ax
                     68: 
                     69:         cRet    vInitRegs
                     70: 
                     71: 
                     72: endProc vInitRegs
                     73: 
                     74:         end
                     75: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.