arch/mips/dec/prom/console.c

   1 /*
   2  *      arch/mips/dec/prom/console.c
   3  *
   4  *      DECstation PROM-based early console support.
   5  *
   6  *      Copyright (C) 2004, 2007  Maciej W. Rozycki
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13 #include <linux/console.h>
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17
  18 #include <asm/dec/prom.h>
  19
  20 static void __init prom_console_write(struct console *con, const char *s,
  21                                       unsigned int c)
  22 {
  23         char buf[81];
  24         unsigned int chunk = sizeof(buf) - 1;
  25
  26         while (c > 0) {
  27                 if (chunk > c)
  28                         chunk = c;
  29                 memcpy(buf, s, chunk);
  30                 buf[chunk] = '\0';
  31                 prom_printf("%s", buf);
  32                 s += chunk;
  33                 c -= chunk;
  34         }
  35 }
  36
  37 static struct console promcons __initdata = {
  38         .name   = "prom",
  39         .write  = prom_console_write,
  40         .flags  = CON_BOOT | CON_PRINTBUFFER,
  41         .index  = -1,
  42 };
  43
  44 void __init register_prom_console(void)
  45 {
  46         register_console(&promcons);
  47 }