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