96 lines
2.0 KiB
C
96 lines
2.0 KiB
C
/*
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* writechr: Write a single character in AL to the console without
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* mangling any registers. This does raw console writes,
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* since some PXE BIOSes seem to interfere regular console I/O.
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*/
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#include <sys/io.h>
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#include <fs.h>
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#include <com32.h>
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#include "bios.h"
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#include "graphics.h"
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#include <syslinux/video.h>
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__export void writechr(char data)
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{
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if (UsingVGA & 0x08)
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syslinux_force_text_mode();
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write_serial(data); /* write to serial port if needed */
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/* Write to screen? */
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if (DisplayCon & 0x01) {
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com32sys_t ireg, oreg;
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bool curxyok = false;
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uint16_t dx;
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memset(&ireg, 0, sizeof ireg);
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ireg.ebx.b[1] = *(uint8_t *)BIOS_page;
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ireg.eax.b[1] = 0x03; /* Read cursor position */
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__intcall(0x10, &ireg, &oreg);
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ireg.edx.l = oreg.edx.l;
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switch (data) {
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case 8:
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if (ireg.edx.b[0]--) {
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curxyok = true;
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break;
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}
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ireg.edx.b[0] = VidCols;
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if (ireg.edx.b[1]--) {
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curxyok = true;
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break;
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}
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ireg.edx.b[1] = 0;
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curxyok = true;
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break;
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case 13:
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ireg.edx.b[0] = 0;
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curxyok = true;
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break;
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case 10:
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break;
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default:
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dx = ireg.edx.w[0];
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ireg.ebx.b[1] = *(uint8_t *)BIOS_page;
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ireg.ebx.b[0] = 0x07; /* White on black */
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ireg.ecx.w[0] = 1; /* One only */
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ireg.eax.b[0] = data;
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ireg.eax.b[1] = 0x09; /* Write char and attribute */
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__intcall(0x10, &ireg, NULL);
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ireg.edx.w[0] = dx;
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if (++ireg.edx.b[0] <= VidCols)
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curxyok = true;
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else
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ireg.edx.b[0] = 0;
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}
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if (!curxyok && ++ireg.edx.b[1] > VidRows) {
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/* Scroll */
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ireg.edx.b[1]--;
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ireg.ebx.b[1] = *(uint8_t *)BIOS_page;
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ireg.eax.b[1] = 0x02;
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__intcall(0x10, &ireg, NULL);
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ireg.eax.w[0] = 0x0601; /* Scroll up one line */
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ireg.ebx.b[1] = ScrollAttribute;
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ireg.ecx.w[0] = 0;
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ireg.edx.w[0] = ScreenSize; /* The whole screen */
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__intcall(0x10, &ireg, NULL);
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} else {
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ireg.ebx.b[1] = *(uint8_t *)BIOS_page;
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ireg.eax.b[1] = 0x02; /* Set cursor position */
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__intcall(0x10, &ireg, NULL);
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}
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}
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}
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void pm_writechr(com32sys_t *regs)
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{
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writechr(regs->eax.b[0]);
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}
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