release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/dec/prom/console.c

   1 /*
   2  *      DECstation PROM-based early console support.
   3  *
   4  *      Copyright (C) 2004, 2007  Maciej W. Rozycki
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11 #include <linux/console.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/dec/prom.h>
  17
  18 static void __init prom_console_write(struct console *con, const char *s,
  19                                       unsigned int c)
  20 {
  21         char buf[81];
  22         unsigned int chunk = sizeof(buf) - 1;
  23
  24         while (c > 0) {
  25                 if (chunk > c)
  26                         chunk = c;
  27                 memcpy(buf, s, chunk);
  28                 buf[chunk] = '\0';
  29                 prom_printf("%s", buf);
  30                 s += chunk;
  31                 c -= chunk;
  32         }
  33 }
  34
  35 static struct console promcons __initdata = {
  36         .name   = "prom",
  37         .write  = prom_console_write,
  38         .flags  = CON_BOOT | CON_PRINTBUFFER,
  39         .index  = -1,
  40 };
  41
  42 void __init register_prom_console(void)
  43 {
  44         register_console(&promcons);
  45 }