linux/arch/sparc64/prom/printf.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

48 lines
1.0 KiB
C

/*
* printf.c: Internal prom library printf facility.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
*
* We used to warn all over the code: DO NOT USE prom_printf(),
* and yet people do. Anton's banking code was outputting banks
* with prom_printf for most of the 2.4 lifetime. Since an effective
* stick is not available, we deployed a carrot: an early printk
* through PROM by means of -p boot option. This ought to fix it.
* USE printk; if you need, deploy -p.
*/
#include <linux/kernel.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
static char ppbuf[1024];
void
prom_write(const char *buf, unsigned int n)
{
char ch;
while (n != 0) {
--n;
if ((ch = *buf++) == '\n')
prom_putchar('\r');
prom_putchar(ch);
}
}
void
prom_printf(char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args);
va_end(args);
prom_write(ppbuf, i);
}