arch/powerpc/boot/ofconsole.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * OF console routines
   4  *
   5  * Copyright (C) Paul Mackerras 1997.
   6  */
   7 #include <stddef.h>
   8 #include "types.h"
   9 #include "elf.h"
  10 #include "string.h"
  11 #include "stdio.h"
  12 #include "page.h"
  13 #include "ops.h"
  14
  15 #include "of.h"
  16
  17 static unsigned int of_stdout_handle;
  18
  19 static int of_console_open(void)
  20 {
  21         void *devp;
  22
  23         if (((devp = of_finddevice("/chosen")) != NULL)
  24             && (of_getprop(devp, "stdout", &of_stdout_handle,
  25                            sizeof(of_stdout_handle))
  26                 == sizeof(of_stdout_handle))) {
  27                 of_stdout_handle = be32_to_cpu(of_stdout_handle);
  28                 return 0;
  29         }
  30
  31         return -1;
  32 }
  33
  34 static void of_console_write(const char *buf, int len)
  35 {
  36         of_call_prom("write", 3, 1, of_stdout_handle, buf, len);
  37 }
  38
  39 void of_console_init(void)
  40 {
  41         console_ops.open = of_console_open;
  42         console_ops.write = of_console_write;
  43 }