core/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         write_serial(data);     /* write to serial port if needed */
  18
  19         if (UsingVGA & 0x8)
  20                 syslinux_force_text_mode();
  21
  22         if (!(DisplayCon & 0x1))
  23                 return;
  24
  25         ireg.eax.b[0] = data;
  26         ireg.eax.b[1] = 0xE;
  27         ireg.ebx.b[0] = 0x07;   /* attribute */
  28         ireg.ebx.b[1] = *(uint8_t *)BIOS_page; /* current page */
  29         __intcall(0x10, &ireg, &oreg);
  30 }
  31
  32 void pm_writechr(com32sys_t *regs)
  33 {
  34         writechr(regs->eax.b[0]);
  35 }