ia64/linux-2.6.18-xen.hg

view arch/sparc/prom/printf.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
1 /*
2 * printf.c: Internal prom library printf facility.
3 *
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
6 *
7 * We used to warn all over the code: DO NOT USE prom_printf(),
8 * and yet people do. Anton's banking code was outputing banks
9 * with prom_printf for most of the 2.4 lifetime. Since an effective
10 * stick is not available, we deployed a carrot: an early printk
11 * through PROM by means of -p boot option. This ought to fix it.
12 * USE printk; if you need, deploy -p.
13 */
15 #include <linux/kernel.h>
17 #include <asm/openprom.h>
18 #include <asm/oplib.h>
20 static char ppbuf[1024];
22 void
23 prom_write(const char *buf, unsigned int n)
24 {
25 char ch;
27 while (n != 0) {
28 --n;
29 if ((ch = *buf++) == '\n')
30 prom_putchar('\r');
31 prom_putchar(ch);
32 }
33 }
35 void
36 prom_printf(char *fmt, ...)
37 {
38 va_list args;
39 int i;
41 va_start(args, fmt);
42 i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args);
43 va_end(args);
45 prom_write(ppbuf, i);
46 }