arch/powerpc/boot/ofconsole.c

   1 /*
   2  * OF console routines
   3  *
   4  * Copyright (C) Paul Mackerras 1997.
   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 <stddef.h>
  12 #include "types.h"
  13 #include "elf.h"
  14 #include "string.h"
  15 #include "stdio.h"
  16 #include "page.h"
  17 #include "ops.h"
  18
  19 #include "of.h"
  20
  21 static unsigned int of_stdout_handle;
  22
  23 static int of_console_open(void)
  24 {
  25         void *devp;
  26
  27         if (((devp = of_finddevice("/chosen")) != NULL)
  28             && (of_getprop(devp, "stdout", &of_stdout_handle,
  29                            sizeof(of_stdout_handle))
  30                 == sizeof(of_stdout_handle))) {
  31                 of_stdout_handle = be32_to_cpu(of_stdout_handle);
  32                 return 0;
  33         }
  34
  35         return -1;
  36 }
  37
  38 static void of_console_write(const char *buf, int len)
  39 {
  40         of_call_prom("write", 3, 1, of_stdout_handle, buf, len);
  41 }
  42
  43 void of_console_init(void)
  44 {
  45         console_ops.open = of_console_open;
  46         console_ops.write = of_console_write;
  47 }