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70 lines
1.7 KiB
70 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* printf.c: Internal prom library printf facility. |
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* |
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* Copyright (C) 1995 David S. Miller ([email protected]) |
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* Copyright (C) 1997 Jakub Jelinek ([email protected]) |
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* Copyright (c) 2002 Pete Zaitcev ([email protected]) |
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* |
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* We used to warn all over the code: DO NOT USE prom_printf(), |
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* and yet people do. Anton's banking code was outputting banks |
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* with prom_printf for most of the 2.4 lifetime. Since an effective |
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* stick is not available, we deployed a carrot: an early printk |
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* through PROM by means of -p boot option. This ought to fix it. |
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* USE printk; if you need, deploy -p. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/compiler.h> |
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#include <linux/spinlock.h> |
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#include <asm/openprom.h> |
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#include <asm/oplib.h> |
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#define CONSOLE_WRITE_BUF_SIZE 1024 |
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static char ppbuf[1024]; |
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static char console_write_buf[CONSOLE_WRITE_BUF_SIZE]; |
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static DEFINE_RAW_SPINLOCK(console_write_lock); |
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void notrace prom_write(const char *buf, unsigned int n) |
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{ |
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unsigned int dest_len; |
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unsigned long flags; |
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char *dest; |
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dest = console_write_buf; |
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raw_spin_lock_irqsave(&console_write_lock, flags); |
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dest_len = 0; |
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while (n-- != 0) { |
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char ch = *buf++; |
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if (ch == '\n') { |
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*dest++ = '\r'; |
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dest_len++; |
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} |
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*dest++ = ch; |
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dest_len++; |
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if (dest_len >= CONSOLE_WRITE_BUF_SIZE - 1) { |
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prom_console_write_buf(console_write_buf, dest_len); |
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dest = console_write_buf; |
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dest_len = 0; |
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} |
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} |
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if (dest_len) |
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prom_console_write_buf(console_write_buf, dest_len); |
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raw_spin_unlock_irqrestore(&console_write_lock, flags); |
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} |
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void notrace prom_printf(const char *fmt, ...) |
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{ |
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va_list args; |
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int i; |
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va_start(args, fmt); |
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i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args); |
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va_end(args); |
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prom_write(ppbuf, i); |
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}
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