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118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
#include "vgamp.h"
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static VGA_REGISTERS Mode12Regs =
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{
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/* CRT Controller Registers */
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{0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E, 0x00, 0x40, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x59, 0xEA, 0x8C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xE3},
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/* Attribute Controller Registers */
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{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
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0x0C, 0x0D, 0x0E, 0x0F, 0x81, 0x00, 0x0F, 0x00, 0x00},
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/* Graphics Controller Registers */
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{0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x05, 0x0F, 0xFF},
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/* Sequencer Registers */
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{0x03, 0x01, 0x0F, 0x00, 0x06},
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/* Misc Output Register */
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0xE3
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};
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VGA_REGISTERS TextModeRegs;
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static VOID FASTCALL
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vgaSaveRegisters(PVGA_REGISTERS Registers)
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{
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SIZE_T i;
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for (i = 0; i < sizeof(Registers->CRT); i++)
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{
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VideoPortWritePortUchar(CRTC, i);
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Registers->CRT[i] = VideoPortReadPortUchar(CRTCDATA);
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}
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for (i = 0; i < sizeof(Registers->Attribute); i++)
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{
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VideoPortReadPortUchar(STATUS);
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VideoPortWritePortUchar(ATTRIB, i);
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Registers->Attribute[i] = VideoPortReadPortUchar(ATTRIBREAD);
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}
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for (i = 0; i < sizeof(Registers->Graphics); i++)
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{
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VideoPortWritePortUchar(GRAPHICS, i);
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Registers->Graphics[i] = VideoPortReadPortUchar(GRAPHICSDATA);
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}
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for (i = 0; i < sizeof(Registers->Sequencer); i++)
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{
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VideoPortWritePortUchar(SEQ, i);
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Registers->Sequencer[i] = VideoPortReadPortUchar(SEQDATA);
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}
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Registers->Misc = VideoPortReadPortUchar(MISC);
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}
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static VOID FASTCALL
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vgaSetRegisters(PVGA_REGISTERS Registers)
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{
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SIZE_T i;
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/* Update misc output register */
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VideoPortWritePortUchar(MISC, Registers->Misc);
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/* Synchronous reset on */
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VideoPortWritePortUchar(SEQ, 0x00);
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VideoPortWritePortUchar(SEQDATA, 0x01);
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/* Write sequencer registers */
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for (i = 1; i < sizeof(Registers->Sequencer); i++)
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{
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VideoPortWritePortUchar(SEQ, i);
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VideoPortWritePortUchar(SEQDATA, Registers->Sequencer[i]);
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}
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/* Synchronous reset off */
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VideoPortWritePortUchar(SEQ, 0x00);
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VideoPortWritePortUchar(SEQDATA, 0x03);
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/* Deprotect CRT registers 0-7 */
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VideoPortWritePortUchar(CRTC, 0x11);
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VideoPortWritePortUchar(CRTCDATA, Registers->CRT[0x11] & 0x7f);
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/* Write CRT registers */
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for (i = 0; i < sizeof(Registers->CRT); i++)
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{
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VideoPortWritePortUchar(CRTC, i);
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VideoPortWritePortUchar(CRTCDATA, Registers->CRT[i]);
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}
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/* Write graphics controller registers */
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for (i = 0; i < sizeof(Registers->Graphics); i++)
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{
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VideoPortWritePortUchar(GRAPHICS, i);
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VideoPortWritePortUchar(GRAPHICSDATA, Registers->Graphics[i]);
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}
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/* Write attribute controller registers */
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for (i = 0; i < sizeof(Registers->Attribute); i++)
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{
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VideoPortReadPortUchar(STATUS);
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VideoPortWritePortUchar(ATTRIB, i);
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VideoPortWritePortUchar(ATTRIB, Registers->Attribute[i]);
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}
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/* Renable screen. */
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VideoPortWritePortUchar(ATTRIB, 0x20);
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}
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VOID
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InitVGAMode()
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{
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vgaSaveRegisters(&TextModeRegs);
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vgaSetRegisters(&Mode12Regs);
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}
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VOID
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VGAResetDevice(OUT PSTATUS_BLOCK StatusBlock)
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{
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vgaSetRegisters(&TextModeRegs);
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}
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