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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/mm/memory_init.h>
  30. #include <arch/drivers/ofw.h>
  31. #include <panic.h>
  32.  
  33. #define MEMMAP_MAX_RECORDS 32
  34.  
  35. typedef struct {
  36.     __u32 start;
  37.     __u32 size;
  38. } memmap_t;
  39.  
  40. size_t get_memory_size(void)
  41. {
  42.     phandle handle = ofw_find_device("/memory");
  43.     if (handle == -1)
  44.         panic("No RAM\n");
  45.    
  46.     memmap_t memmap[MEMMAP_MAX_RECORDS];
  47.     size_t ret = ofw_get_property(handle, "reg", &memmap, sizeof(memmap));
  48.     if (ret == -1)
  49.         panic("Device /memory has no reg property\n");
  50.    
  51.     size_t total;
  52.     int i;
  53.    
  54.     for (i = 0; i < MEMMAP_MAX_RECORDS; i++) {
  55.         if (memmap[i].size == 0)
  56.             break;
  57.         total += memmap[i].size;
  58.     }
  59.  
  60.     return total;
  61. }
  62.