core/bios/plaincon.c

   1 #include <sys/io.h>
   2 #include <fs.h>
   3 #include <com32.h>
   4
   5 #include "bios.h"
   6 #include "graphics.h"
   7 #include <syslinux/video.h>
   8
   9 /*
  10  * Write a single character in AL to the console without
  11  * mangling any registers; handle video pages correctly.
  12  */
  13 __export void writechr(char data)
  14 {
  15         com32sys_t ireg, oreg;
  16
  17         memset(&ireg, 0, sizeof ireg);
  18         memset(&oreg, 0, sizeof oreg);
  19         write_serial(data);     /* write to serial port if needed */
  20
  21         if (UsingVGA & 0x8)
  22                 syslinux_force_text_mode();
  23
  24         if (!(DisplayCon & 0x1))
  25                 return;
  26
  27         ireg.eax.b[0] = data;
  28         ireg.eax.b[1] = 0xE;
  29         ireg.ebx.b[0] = 0x07;   /* attribute */
  30         ireg.ebx.b[1] = *(uint8_t *)BIOS_page; /* current page */
  31         __intcall(0x10, &ireg, &oreg);
  32 }
  33
  34 void pm_writechr(com32sys_t *regs)
  35 {
  36         writechr(regs->eax.b[0]);
  37 }