53 lines
947 B
C
53 lines
947 B
C
#include "pc_stuff.h"
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#define INPUT_STATUS (0x03da)
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#define VBLANK (0x08)
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#define BIOS_SET_VIDEO_MODE (0x00)
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byte *VGA = (byte *)0xA0000;
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void setVideoMode(byte videoMode) {
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union REGS regs;
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regs.h.ah = BIOS_SET_VIDEO_MODE;
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regs.h.al = videoMode;
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int386(BIOS_VIDEO_INTERRUPT, ®s, ®s);
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}
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void waitStartVbl() {
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while (inp(INPUT_STATUS) & VBLANK);
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}
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void waitEndVbl() {
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while (!(inp(INPUT_STATUS) & VBLANK));
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}
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#define FAILSAFE (80)
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void writeString(char *buffer, int x, int y) {
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union REGS regs;
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int i, currentX = x;
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char c;
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for (i = 0; i < FAILSAFE; ++i) {
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c = buffer[i];
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if (c == 0) break;
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regs.h.ah = 0x02;
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regs.h.bh = 0x00;
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regs.h.dh = y;
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regs.h.dl = currentX;
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int386(BIOS_VIDEO_INTERRUPT, ®s, ®s);
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regs.h.ah = 0x09;
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regs.h.al = c;
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regs.h.bh = 0x00;
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regs.h.bl = 1;
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regs.w.cx = 1;
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int386(BIOS_VIDEO_INTERRUPT, ®s, ®s);
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currentX++;
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}
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}
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