49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
/*
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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 (davem@caip.rutgers.edu)
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* Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
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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/module.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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static char ppbuf[1024];
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void
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prom_write(const char *buf, unsigned int n)
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{
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char ch;
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while (n != 0) {
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--n;
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if ((ch = *buf++) == '\n')
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prom_putchar('\r');
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prom_putchar(ch);
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}
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}
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void
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prom_printf(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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EXPORT_SYMBOL(prom_printf);
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