console.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:1k
- /*
- * 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/config.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <asm/sgialib.h>
- #include <asm/bcache.h>
- #include <linux/console.h>
- #include <linux/kdev_t.h>
- #include <linux/major.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)
- {
- long cnt;
- char it = c;
- bc_disable();
- romvec->write(1, &it, 1, &cnt);
- bc_enable();
- }
- char __init prom_getchar(void)
- {
- long cnt;
- char c;
- bc_disable();
- romvec->read(0, &c, 1, &cnt);
- bc_enable();
- return c;
- }
- static char ppbuf[1024];
- void prom_printf(char *fmt, ...)
- {
- va_list args;
- char ch, *bptr;
- int i;
- va_start(args, fmt);
- i = vsprintf(ppbuf, fmt, args);
- bptr = ppbuf;
- while ((ch = *(bptr++)) != 0) {
- if (ch == 'n')
- prom_putchar('r');
- prom_putchar(ch);
- }
- va_end(args);
- }