grub-core/kern/ieee1275/mmap.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2003,2004,2005,2007,2008 Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/memory.h>
  20 #include <grub/ieee1275/ieee1275.h>
  21 #include <grub/types.h>
  22
  23 grub_err_t
  24 grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
  25 {
  26   grub_ieee1275_phandle_t root;
  27   grub_ieee1275_phandle_t memory;
  28   grub_uint32_t available[128];
  29   grub_ssize_t available_size;
  30   grub_uint32_t address_cells = 1;
  31   grub_uint32_t size_cells = 1;
  32   int i;
  33
  34   /* Determine the format of each entry in `available'.  */
  35   grub_ieee1275_finddevice ("/", &root);
  36   grub_ieee1275_get_integer_property (root, "#address-cells", &address_cells,
  37                                       sizeof address_cells, 0);
  38   grub_ieee1275_get_integer_property (root, "#size-cells", &size_cells,
  39                                       sizeof size_cells, 0);
  40
  41   if (size_cells > address_cells)
  42     address_cells = size_cells;
  43
  44   /* Load `/memory/available'.  */
  45   if (grub_ieee1275_finddevice ("/memory", &memory))
  46     return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
  47                        "couldn't find /memory node");
  48   if (grub_ieee1275_get_integer_property (memory, "available", available,
  49                                           sizeof available, &available_size))
  50     return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
  51                        "couldn't examine /memory/available property");
  52   if (available_size < 0 || (grub_size_t) available_size > sizeof (available))
  53     return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
  54                        "/memory response buffer exceeded");
  55
  56   if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_BROKEN_ADDRESS_CELLS))
  57     {
  58       address_cells = 1;
  59       size_cells = 1;
  60     }
  61
  62   /* Decode each entry and call `hook'.  */
  63   i = 0;
  64   available_size /= sizeof (grub_uint32_t);
  65   while (i < available_size)
  66     {
  67       grub_uint64_t address;
  68       grub_uint64_t size;
  69
  70       address = available[i++];
  71       if (address_cells == 2)
  72         address = (address << 32) | available[i++];
  73
  74       size = available[i++];
  75       if (size_cells == 2)
  76         size = (size << 32) | available[i++];
  77
  78       if (hook (address, size, GRUB_MEMORY_AVAILABLE, hook_data))
  79         break;
  80     }
  81
  82   return grub_errno;
  83 }