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