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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> |
17 | #include <linux/compiler.h> |
18 | #include <linux/spinlock.h> |
19 | |
20 | #include <asm/openprom.h> |
21 | #include <asm/oplib.h> |
22 | |
23 | #define CONSOLE_WRITE_BUF_SIZE 1024 |
24 | |
25 | static char ppbuf[1024]; |
26 | static char console_write_buf[CONSOLE_WRITE_BUF_SIZE]; |
27 | static DEFINE_RAW_SPINLOCK(console_write_lock); |
28 | |
29 | void notrace prom_write(const char *buf, unsigned int n) |
30 | { |
31 | unsigned int dest_len; |
32 | unsigned long flags; |
33 | char *dest; |
34 | |
35 | dest = console_write_buf; |
36 | raw_spin_lock_irqsave(&console_write_lock, flags); |
37 | |
38 | dest_len = 0; |
39 | while (n-- != 0) { |
40 | char ch = *buf++; |
41 | if (ch == '\n') { |
42 | *dest++ = '\r'; |
43 | dest_len++; |
44 | } |
45 | *dest++ = ch; |
46 | dest_len++; |
47 | if (dest_len >= CONSOLE_WRITE_BUF_SIZE - 1) { |
48 | prom_console_write_buf(console_write_buf, dest_len); |
49 | dest = console_write_buf; |
50 | dest_len = 0; |
51 | } |
52 | } |
53 | if (dest_len) |
54 | prom_console_write_buf(console_write_buf, dest_len); |
55 | |
56 | raw_spin_unlock_irqrestore(&console_write_lock, flags); |
57 | } |
58 | |
59 | void notrace prom_printf(const char *fmt, ...) |
60 | { |
61 | va_list args; |
62 | int i; |
63 | |
64 | va_start(args, fmt); |
65 | i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args); |
66 | va_end(args); |
67 | |
68 | prom_write(ppbuf, i); |
69 | } |
70 |
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