mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 18:24:14 +08:00
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/*
|
|
* Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
|
|
*
|
|
* This program is free software; you can distribute it and/or modify it
|
|
* under the terms of the GNU General Public License (Version 2) as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
|
*
|
|
* Putting things on the screen/serial line using YAMONs facilities.
|
|
*/
|
|
#include <linux/console.h>
|
|
#include <linux/init.h>
|
|
#include <linux/serial_reg.h>
|
|
#include <asm/io.h>
|
|
|
|
|
|
#define PORT(offset) (0x3f8 + (offset))
|
|
|
|
|
|
static inline unsigned int serial_in(int offset)
|
|
{
|
|
return inb(PORT(offset));
|
|
}
|
|
|
|
static inline void serial_out(int offset, int value)
|
|
{
|
|
outb(value, PORT(offset));
|
|
}
|
|
|
|
int prom_putchar(char c)
|
|
{
|
|
while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
|
|
;
|
|
|
|
serial_out(UART_TX, c);
|
|
|
|
return 1;
|
|
}
|