1 // SPDX-License-Identifier: GPL-2.0 <<
2 /* 1 /*
3 * printf.c: Internal prom library printf fac 2 * printf.c: Internal prom library printf facility.
4 * 3 *
5 * Copyright (C) 1995 David S. Miller (davem@c 4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1997 Jakub Jelinek (jj@sunsit <<
7 * Copyright (c) 2002 Pete Zaitcev (zaitcev@ya 5 * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
8 * 6 *
9 * We used to warn all over the code: DO NOT U 7 * We used to warn all over the code: DO NOT USE prom_printf(),
10 * and yet people do. Anton's banking code was !! 8 * and yet people do. Anton's banking code was outputing banks
11 * with prom_printf for most of the 2.4 lifeti 9 * with prom_printf for most of the 2.4 lifetime. Since an effective
12 * stick is not available, we deployed a carro 10 * stick is not available, we deployed a carrot: an early printk
13 * through PROM by means of -p boot option. Th 11 * through PROM by means of -p boot option. This ought to fix it.
14 * USE printk; if you need, deploy -p. 12 * USE printk; if you need, deploy -p.
15 */ 13 */
16 14
17 #include <linux/kernel.h> 15 #include <linux/kernel.h>
18 #include <linux/compiler.h> <<
19 #include <linux/spinlock.h> <<
20 16
21 #include <asm/openprom.h> 17 #include <asm/openprom.h>
22 #include <asm/oplib.h> 18 #include <asm/oplib.h>
23 19
24 #define CONSOLE_WRITE_BUF_SIZE 1024 <<
25 <<
26 static char ppbuf[1024]; 20 static char ppbuf[1024];
27 static char console_write_buf[CONSOLE_WRITE_BU <<
28 static DEFINE_RAW_SPINLOCK(console_write_lock) <<
29 21
30 void notrace prom_write(const char *buf, unsig !! 22 void
>> 23 prom_write(const char *buf, unsigned int n)
31 { 24 {
32 unsigned int dest_len; !! 25 char ch;
33 unsigned long flags; <<
34 char *dest; <<
35 <<
36 dest = console_write_buf; <<
37 raw_spin_lock_irqsave(&console_write_l <<
38 <<
39 dest_len = 0; <<
40 while (n-- != 0) { <<
41 char ch = *buf++; <<
42 if (ch == '\n') { <<
43 *dest++ = '\r'; <<
44 dest_len++; <<
45 } <<
46 *dest++ = ch; <<
47 dest_len++; <<
48 if (dest_len >= CONSOLE_WRITE_ <<
49 prom_console_write_buf <<
50 dest = console_write_b <<
51 dest_len = 0; <<
52 } <<
53 } <<
54 if (dest_len) <<
55 prom_console_write_buf(console <<
56 26
57 raw_spin_unlock_irqrestore(&console_wr !! 27 while (n != 0) {
>> 28 --n;
>> 29 if ((ch = *buf++) == '\n')
>> 30 prom_putchar('\r');
>> 31 prom_putchar(ch);
>> 32 }
58 } 33 }
59 34
60 void notrace prom_printf(const char *fmt, ...) !! 35 void
>> 36 prom_printf(char *fmt, ...)
61 { 37 {
62 va_list args; 38 va_list args;
63 int i; 39 int i;
64 40
65 va_start(args, fmt); 41 va_start(args, fmt);
66 i = vscnprintf(ppbuf, sizeof(ppbuf), f !! 42 i = vsnprintf(ppbuf, sizeof(ppbuf), fmt, args);
67 va_end(args); 43 va_end(args);
68 44
69 prom_write(ppbuf, i); 45 prom_write(ppbuf, i);
70 } 46 }
71 47
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