LXR linux/arch/sparc64/prom/printf.c

   1/*
   2 * printf.c:  Internal prom library printf facility.
   3 *
   4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6 * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
   7 *
   8 * We used to warn all over the code: DO NOT USE prom_printf(),
   9 * and yet people do. Anton's banking code was outputting banks
  10 * with prom_printf for most of the 2.4 lifetime. Since an effective
  11 * stick is not available, we deployed a carrot: an early printk
  12 * through PROM by means of -p boot option. This ought to fix it.
  13 * USE printk; if you need, deploy -p.
  14 */
  15
  16#include <linux/kernel.h>
  17
  18#include <asm/openprom.h>
  19#include <asm/oplib.h>
  20
  21static char ppbuf[1024];
  22
  23void
  24prom_write(const char *buf, unsigned int n)
  25{
  26        char ch;
  27
  28        while (n != 0) {
  29                --n;
  30                if ((ch = *buf++) == '\n')
  31                        prom_putchar('\r');
  32                prom_putchar(ch);
  33        }
  34}
  35
  36void
  37prom_printf(const char *fmt, ...)
  38{
  39        va_list args;
  40        int i;
  41
  42        va_start(args, fmt);
  43        i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args);
  44        va_end(args);
  45
  46        prom_write(ppbuf, i);
  47}
  48