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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.  /** @addtogroup genarch   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <genarch/ofw/ofw.h>
  36. #include <arch/asm.h>
  37. #include <stdarg.h>
  38. #include <cpu.h>
  39. #include <arch/types.h>
  40.  
  41. ofw_entry ofw;
  42.  
  43. phandle ofw_chosen;
  44. ihandle ofw_stdin;
  45. ihandle ofw_stdout;
  46.  
  47. void ofw_init(void)
  48. {
  49.     ofw_chosen = ofw_find_device("/chosen");
  50.     if (ofw_chosen == -1)
  51.         ofw_done();
  52.    
  53.     if (ofw_get_property(ofw_chosen, "stdin",  &ofw_stdin, sizeof(ofw_stdin)) <= 0)
  54.         ofw_stdin = 0;
  55.        
  56.     if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
  57.         ofw_stdout = 0;
  58. }
  59.  
  60. void ofw_done(void)
  61. {
  62.     (void) ofw_call("exit", 0, 0);
  63.     cpu_halt();
  64. }
  65.  
  66. __native ofw_call(const char *service, const int nargs, const int nret, ...)
  67. {
  68.     va_list list;
  69.     ofw_args_t args;
  70.     int i;
  71.    
  72.     args.service = service;
  73.     args.nargs = nargs;
  74.     args.nret = nret;
  75.    
  76.     va_start(list, nret);
  77.     for (i = 0; i < nargs; i++)
  78.         args.args[i] = va_arg(list, ofw_arg_t);
  79.     va_end(list);
  80.    
  81.     for (i = 0; i < nret; i++)
  82.         args.args[i + nargs] = 0;
  83.    
  84.     ofw(&args);
  85.    
  86.     return args.args[nargs];
  87. }
  88.  
  89. void ofw_putchar(const char ch)
  90. {
  91.     if (ofw_stdout == 0)
  92.         return;
  93.    
  94.     (void) ofw_call("write", 3, 1, ofw_stdout, &ch, 1);
  95. }
  96.  
  97. /** Read character from OFW's input.
  98.  *
  99.  * This call is non-blocking.
  100.  *
  101.  * @return 0 if no character was read, character read otherwise.
  102.  */
  103. char ofw_getchar(void)
  104. {
  105.     char ch;
  106.  
  107.     if (ofw_stdin == 0)
  108.         return 0;
  109.    
  110.     if (ofw_call("read", 3, 1, ofw_stdin, &ch, 1) == 1)
  111.         return ch;
  112.     else
  113.         return 0;
  114. }
  115.  
  116. phandle ofw_find_device(const char *name)
  117. {
  118.     return (phandle) ofw_call("finddevice", 1, 1, name);
  119. }
  120.  
  121. int ofw_get_property(const phandle device, const char *name, void *buf, const int buflen)
  122. {
  123.     return (int) ofw_call("getprop", 4, 1, device, name, buf, buflen);
  124. }
  125.  
  126. void *ofw_claim(const void *addr, const int size, const int align)
  127. {
  128.     return (void *) ofw_call("claim", 3, 1, addr, size, align);
  129. }
  130.  
  131.  /** @}
  132.  */
  133.  
  134.