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 5 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 7 * Copyright (c) 2002 Pete Zaitcev (zaitcev@ya 6 * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com) 8 * 7 * 9 * We used to warn all over the code: DO NOT U 8 * We used to warn all over the code: DO NOT USE prom_printf(), 10 * and yet people do. Anton's banking code was 9 * and yet people do. Anton's banking code was outputting banks 11 * with prom_printf for most of the 2.4 lifeti 10 * with prom_printf for most of the 2.4 lifetime. Since an effective 12 * stick is not available, we deployed a carro 11 * stick is not available, we deployed a carrot: an early printk 13 * through PROM by means of -p boot option. Th 12 * through PROM by means of -p boot option. This ought to fix it. 14 * USE printk; if you need, deploy -p. 13 * USE printk; if you need, deploy -p. 15 */ 14 */ 16 15 17 #include <linux/kernel.h> 16 #include <linux/kernel.h> 18 #include <linux/compiler.h> 17 #include <linux/compiler.h> 19 #include <linux/spinlock.h> << 20 18 21 #include <asm/openprom.h> 19 #include <asm/openprom.h> 22 #include <asm/oplib.h> 20 #include <asm/oplib.h> 23 21 24 #define CONSOLE_WRITE_BUF_SIZE 1024 << 25 << 26 static char ppbuf[1024]; 22 static char ppbuf[1024]; 27 static char console_write_buf[CONSOLE_WRITE_BU << 28 static DEFINE_RAW_SPINLOCK(console_write_lock) << 29 23 30 void notrace prom_write(const char *buf, unsig 24 void notrace prom_write(const char *buf, unsigned int n) 31 { 25 { 32 unsigned int dest_len; !! 26 char ch; 33 unsigned long flags; << 34 char *dest; << 35 << 36 dest = console_write_buf; << 37 raw_spin_lock_irqsave(&console_write_l << 38 27 39 dest_len = 0; !! 28 while (n != 0) { 40 while (n-- != 0) { !! 29 --n; 41 char ch = *buf++; !! 30 if ((ch = *buf++) == '\n') 42 if (ch == '\n') { !! 31 prom_putchar('\r'); 43 *dest++ = '\r'; !! 32 prom_putchar(ch); 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 } 33 } 54 if (dest_len) << 55 prom_console_write_buf(console << 56 << 57 raw_spin_unlock_irqrestore(&console_wr << 58 } 34 } 59 35 60 void notrace prom_printf(const char *fmt, ...) 36 void notrace prom_printf(const 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 = vscnprintf(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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