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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 "ofw.h"
  30. #include "printf.h"
  31.  
  32. ofw_entry ofw;
  33.  
  34. phandle ofw_chosen;
  35. ihandle ofw_mmu;
  36. ihandle ofw_stdout;
  37.  
  38.  
  39. void init(void)
  40. {
  41.     ofw_chosen = ofw_find_device("/chosen");
  42.     if (ofw_chosen == -1)
  43.         halt();
  44.    
  45.     if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0) 
  46.         ofw_stdout = 0;
  47.    
  48.     ofw_mmu = ofw_open("/mmu");
  49.     if (ofw_mmu == -1) {
  50.         puts("Unable to open /mmu node\n");
  51.         halt();
  52.     }
  53. }
  54.  
  55. void halt(void)
  56. {
  57.     ofw_call("exit", 0, 0);
  58. }
  59.  
  60.  
  61. int ofw_call(const char *service, const int nargs, const int nret, ...)
  62. {
  63.     va_list list;
  64.     ofw_args_t args;
  65.     int i;
  66.    
  67.     args.service = service;
  68.     args.nargs = nargs;
  69.     args.nret = nret;
  70.    
  71.     va_start(list, nret);
  72.     for (i = 0; i < nargs; i++)
  73.         args.args[i] = va_arg(list, ofw_arg_t);
  74.     va_end(list);
  75.    
  76.     for (i = 0; i < nret; i++)
  77.         args.args[i + nargs] = 0;
  78.    
  79.     ofw(&args);
  80.    
  81.     if (nret > 0)
  82.         return args.args[nargs + nret - 1];
  83.     else
  84.         return 0;
  85. }
  86.  
  87.  
  88. ihandle ofw_open(const char *name)
  89. {
  90.     return ofw_call("open", 1, 1, name);
  91. }
  92.  
  93.  
  94. void ofw_write(const char *str, const int len)
  95. {
  96.     if (ofw_stdout == 0)
  97.         return;
  98.    
  99.     ofw_call("write", 3, 1, ofw_stdout, str, len);
  100. }
  101.  
  102.  
  103. phandle ofw_find_device(const char *name)
  104. {
  105.     return ofw_call("finddevice", 1, 1, name);
  106. }
  107.  
  108.  
  109. int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
  110. {
  111.     return ofw_call("getprop", 4, 1, device, name, buf, buflen);
  112. }
  113.  
  114.  
  115. void *ofw_claim(const void *addr, const int size, const int align)
  116. {
  117.     return (void *) ofw_call("claim", 3, 1, addr, size, align);
  118. }
  119.  
  120.  
  121. void *ofw_translate(const void *virt)
  122. {
  123.     return (void *) ofw_call_method(ofw_mmu, "translate", 1, 5, virt);
  124. }
  125.