Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * printf.c: Internal prom library printf facility. | |
3 | * | |
4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com) | |
7 | * | |
8 | * We used to warn all over the code: DO NOT USE prom_printf(), | |
9 | * and yet people do. Anton's banking code was outputting banks | |
10 | * with prom_printf for most of the 2.4 lifetime. Since an effective | |
11 | * stick is not available, we deployed a carrot: an early printk | |
12 | * through PROM by means of -p boot option. This ought to fix it. | |
13 | * USE printk; if you need, deploy -p. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
bd4352ca | 17 | #include <linux/compiler.h> |
1da177e4 LT |
18 | |
19 | #include <asm/openprom.h> | |
20 | #include <asm/oplib.h> | |
21 | ||
22 | static char ppbuf[1024]; | |
23 | ||
bd4352ca | 24 | void notrace prom_write(const char *buf, unsigned int n) |
1da177e4 LT |
25 | { |
26 | char ch; | |
27 | ||
28 | while (n != 0) { | |
29 | --n; | |
30 | if ((ch = *buf++) == '\n') | |
31 | prom_putchar('\r'); | |
32 | prom_putchar(ch); | |
33 | } | |
34 | } | |
35 | ||
bd4352ca | 36 | void notrace prom_printf(const char *fmt, ...) |
1da177e4 LT |
37 | { |
38 | va_list args; | |
39 | int i; | |
40 | ||
41 | va_start(args, fmt); | |
42 | i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args); | |
43 | va_end(args); | |
44 | ||
45 | prom_write(ppbuf, i); | |
46 | } |