Logo Search packages:      
Sourcecode: linux version File versions  Download package

printf.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(const 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);
}

Generated by  Doxygen 1.6.0   Back to index