arch/common/boot/grub2/kern/i386/coreboot/mmap.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 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/machine/memory.h>
  20 #include <grub/types.h>
  21 #include <grub/err.h>
  22 #include <grub/misc.h>
  23
  24 static grub_err_t
  25 grub_linuxbios_table_iterate (int (*hook) (grub_linuxbios_table_item_t))
  26 {
  27   grub_linuxbios_table_header_t table_header;
  28   grub_linuxbios_table_item_t table_item;
  29
  30   auto int check_signature (grub_linuxbios_table_header_t);
  31   int check_signature (grub_linuxbios_table_header_t tbl_header)
  32   {
  33     if (! grub_memcmp (tbl_header->signature, "LBIO", 4))
  34       return 1;
  35
  36     return 0;
  37   }
  38
  39   /* Assuming table_header is aligned to its size (8 bytes).  */
  40
  41   for (table_header = (grub_linuxbios_table_header_t) 0x500;
  42        table_header < (grub_linuxbios_table_header_t) 0x1000; table_header++)
  43     if (check_signature (table_header))
  44       goto signature_found;
  45
  46   for (table_header = (grub_linuxbios_table_header_t) 0xf0000;
  47        table_header < (grub_linuxbios_table_header_t) 0x100000; table_header++)
  48     if (check_signature (table_header))
  49       goto signature_found;
  50
  51   grub_fatal ("Could not find coreboot table\n");
  52
  53 signature_found:
  54
  55   table_item =
  56     (grub_linuxbios_table_item_t) ((long) table_header +
  57                                (long) table_header->size);
  58   for (; table_item->size;
  59        table_item = (grub_linuxbios_table_item_t) ((long) table_item + (long) table_item->size))
  60     if (hook (table_item))
  61       return 1;
  62
  63   return 0;
  64 }
  65
  66 void
  67 grub_machine_mmap_iterate (int NESTED_FUNC_ATTR (*hook) (grub_uint64_t, grub_uint64_t, grub_uint32_t))
  68 {
  69   mem_region_t mem_region;
  70
  71   auto int iterate_linuxbios_table (grub_linuxbios_table_item_t);
  72   int iterate_linuxbios_table (grub_linuxbios_table_item_t table_item)
  73   {
  74     if (table_item->tag != GRUB_LINUXBIOS_MEMBER_MEMORY)
  75       return 0;
  76
  77     mem_region =
  78       (mem_region_t) ((long) table_item +
  79                                  sizeof (struct grub_linuxbios_table_item));
  80     while ((long) mem_region < (long) table_item + (long) table_item->size)
  81       {
  82         if (hook (mem_region->addr, mem_region->size,
  83                   /* Multiboot mmaps match with the coreboot mmap definition.
  84                      Therefore, we can just pass type through.  */
  85                   mem_region->type))
  86           return 1;
  87
  88         mem_region++;
  89       }
  90
  91     return 0;
  92   }
  93
  94   grub_linuxbios_table_iterate (iterate_linuxbios_table);
  95
  96   return 0;
  97 }