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  1. /*
  2.  * Copyright (C) 2005 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <arch/drivers/ofw.h>
  30. #include <stdarg.h>
  31.  
  32. ihandle ofw_chosen;
  33. ihandle ofw_stdout;
  34. ofw_entry ofw;
  35.  
  36. void ofw_init(void)
  37. {
  38.     ofw_chosen = ofw_call("finddevice", 1, 1, "/chosen");
  39.     if (ofw_chosen == -1)
  40.         ofw_done();
  41.    
  42.     if (ofw_call("getprop", 4, 1, ofw_chosen, "stdout", &ofw_stdout, sizeof(ofw_stdout)) <= 0)
  43.         ofw_stdout = 0;
  44. }
  45.  
  46. void ofw_done(void)
  47. {
  48.     ofw_call("exit", 0, 0);
  49.     cpu_halt();
  50. }
  51.  
  52. int ofw_call(const char *service, const int nargs, const int nret, ...)
  53. {
  54.     va_list list;
  55.     struct ofw_args_t args;
  56.     int i;
  57.    
  58.     args.service = service;
  59.     args.nargs = nargs;
  60.     args.nret = nret;
  61.    
  62.     va_start(list, nret);
  63.     for (i = 0; i < nargs; i++)
  64.         args.args[i] = va_arg(list, ofw_arg_t);
  65.     va_end(list);
  66.    
  67.     for (i = 0; i < nret; i++)
  68.         args.args[i + nargs] = 0;
  69.    
  70.     ofw(&args);
  71.    
  72.     return args.args[nargs];
  73. }
  74.  
  75. void ofw_putchar(const char ch)
  76. {
  77.     if (ofw_stdout == 0)
  78.         return;
  79.    
  80.     ofw_call("write", 3, 1, ofw_stdout, ch, 1);
  81. }
  82.  
  83. void putchar(const char ch)
  84. {
  85.     ofw_putchar(ch);
  86. }
  87.