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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. #define MAX_OFW_ARGS    10
  33.  
  34. typedef unsigned int ofw_arg_t;
  35. typedef unsigned int ihandle;
  36. typedef unsigned int phandle;
  37.  
  38. /** OpenFirmware command structure
  39.  *
  40.  */
  41. typedef struct {
  42.     const char *service;          /**< Command name */
  43.     unsigned int nargs;           /**< Number of in arguments */
  44.     unsigned int nret;            /**< Number of out arguments */
  45.     ofw_arg_t args[MAX_OFW_ARGS]; /**< List of arguments */
  46. } ofw_args_t;
  47.  
  48. typedef void (*ofw_entry)(ofw_args_t *);
  49.  
  50.  
  51. ofw_entry ofw;
  52.  
  53. phandle ofw_chosen;
  54. ihandle ofw_mmu;
  55. ihandle ofw_stdout;
  56.  
  57.  
  58. static int ofw_call(const char *service, const int nargs, const int nret, ...)
  59. {
  60.     va_list list;
  61.     ofw_args_t args;
  62.     int i;
  63.    
  64.     args.service = service;
  65.     args.nargs = nargs;
  66.     args.nret = nret;
  67.    
  68.     va_start(list, nret);
  69.     for (i = 0; i < nargs; i++)
  70.         args.args[i] = va_arg(list, ofw_arg_t);
  71.     va_end(list);
  72.    
  73.     for (i = 0; i < nret; i++)
  74.         args.args[i + nargs] = 0;
  75.    
  76.     ofw(&args);
  77.    
  78.     return args.args[nargs];
  79. }
  80.  
  81.  
  82. static phandle ofw_find_device(const char *name)
  83. {
  84.     return ofw_call("finddevice", 1, 1, name);
  85. }
  86.  
  87.  
  88. static int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
  89. {
  90.     return ofw_call("getprop", 4, 1, device, name, buf, buflen);
  91. }
  92.  
  93. static ihandle ofw_open(const char *name)
  94. {
  95.     return ofw_call("open", 1, 1, name);
  96. }
  97.  
  98.  
  99. void init(void)
  100. {
  101.     ofw_chosen = ofw_find_device("/chosen");
  102.     if (ofw_chosen == -1)
  103.         halt();
  104.    
  105.     if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0) 
  106.         ofw_stdout = 0;
  107.    
  108.     ofw_mmu = ofw_open("/mmu");
  109.     if (ofw_mmu == -1) {
  110.         puts("Unable to open /mmu node\n");
  111.         halt();
  112.     }
  113. }
  114.  
  115.  
  116. void halt(void)
  117. {
  118.     ofw_call("exit", 0, 0);
  119. }
  120.  
  121.  
  122. void ofw_write(const char *str, const int len)
  123. {
  124.     if (ofw_stdout == 0)
  125.         return;
  126.    
  127.     ofw_call("write", 3, 1, ofw_stdout, str, len);
  128. }
  129.  
  130.  
  131. void *ofw_translate(const void *virt)
  132. {
  133.     return (void *) ofw_call("call-method", 7, 1, "translate", ofw_mmu, virt, 0, 0, 0, 0);
  134. }
  135.  
  136.  
  137. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  138. {
  139.     return ofw_call("call-method", 6, 1, "map", ofw_mmu, mode, size, virt, phys);
  140. }
  141.  
  142.  
  143. int ofw_memmap(memmap_t *map)
  144. {
  145.     int i;
  146.     int ret;
  147.  
  148.     phandle handle = ofw_find_device("/memory");
  149.     if (handle == -1)
  150.         return false;
  151.    
  152.     ret = ofw_get_property(handle, "reg", &map->zones, sizeof(map->zones));
  153.     if (ret == -1)
  154.         return false;
  155.    
  156.     map->total = 0;
  157.     map->count = 0;
  158.     for (i = 0; i < MEMMAP_MAX_RECORDS; i++) {
  159.         if (map->zones[i].size == 0)
  160.             break;
  161.         map->count++;
  162.         map->total += map->zones[i].size;
  163.     }
  164. }
  165.