46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright 2007 rPath, Inc. - All Rights Reserved
|
|
* Copyright 2009 Intel Corporation; author H. Peter Anvin
|
|
*
|
|
* This file is part of the Linux kernel, and is made available under
|
|
* the terms of the GNU General Public License version 2.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/**
|
|
* @file
|
|
* @brief Very simple screen I/O for the initialization stage
|
|
*
|
|
* @todo Probably should add very simple serial I/O?
|
|
* @attention This is real mode code!
|
|
*/
|
|
|
|
#include <asm/segment.h>
|
|
#include "boot.h"
|
|
|
|
/* be aware of: */
|
|
THIS_IS_REALMODE_CODE
|
|
|
|
static void __bootcode putchar(int ch)
|
|
{
|
|
struct biosregs ireg;
|
|
|
|
if (ch == '\n')
|
|
putchar('\r'); /* \n -> \r\n */
|
|
|
|
initregs(&ireg);
|
|
ireg.bx = 0x0007;
|
|
ireg.cx = 0x0001;
|
|
ireg.ah = 0x0e;
|
|
ireg.al = ch;
|
|
intcall(0x10, &ireg, NULL);
|
|
}
|
|
|
|
void __bootcode boot_puts(char *str)
|
|
{
|
|
while (*str)
|
|
putchar(*str++);
|
|
}
|