e62cac1fd0
This gets us closer to being able to eliminate the use of dynamic and stack based buffers, so that we can adhere to the "no buffer addresses above 4GB" rule for PROM calls. Signed-off-by: David S. Miller <davem@davemloft.net>
47 lines
1.1 KiB
C
47 lines
1.1 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) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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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/compiler.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 notrace prom_write(const char *buf, unsigned int n)
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{
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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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char tmp = '\r';
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prom_putchar(&tmp);
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}
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prom_putchar(buf);
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buf++;
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}
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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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