linux-stable/arch/mips/arc/promlib.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

43 lines
966 B
C

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1996 David S. Miller (dm@sgi.com)
* Compability with board caches, Ulf Carlsson
*/
#include <linux/kernel.h>
#include <asm/sgialib.h>
#include <asm/bcache.h>
/*
* IP22 boardcache is not compatible with board caches. Thus we disable it
* during romvec action. Since r4xx0.c is always compiled and linked with your
* kernel, this shouldn't cause any harm regardless what MIPS processor you
* have.
*
* The ARC write and read functions seem to interfere with the serial lines
* in some way. You should be careful with them.
*/
void prom_putchar(char c)
{
ULONG cnt;
CHAR it = c;
bc_disable();
ArcWrite(1, &it, 1, &cnt);
bc_enable();
}
char prom_getchar(void)
{
ULONG cnt;
CHAR c;
bc_disable();
ArcRead(0, &c, 1, &cnt);
bc_enable();
return c;
}