source: grub-pc/trunk/fuentes/grub-core/kern/i386/multiboot_mmap.c @ 22

Last change on this file since 22 was 22, checked in by mabarracus, 4 years ago

updated version and apply net.ifnames=0 into debian/rules

File size: 2.7 KB
Line 
1/*
2 *  GRUB  --  GRand Unified Bootloader
3 *  Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009  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/multiboot.h>
22#include <grub/err.h>
23#include <grub/misc.h>
24
25/* A pointer to the MBI in its initial location.  */
26struct multiboot_info *startup_multiboot_info;
27
28/* The MBI has to be copied to our BSS so that it won't be
29   overwritten.  This is its final location.  */
30static struct multiboot_info kern_multiboot_info;
31
32/* Unfortunately we can't use heap at this point.  But 32 looks like a sane
33   limit (used by memtest86).  */
34static grub_uint8_t mmap_entries[sizeof (struct multiboot_mmap_entry) * 32];
35
36void
37grub_machine_mmap_init (void)
38{
39  if (! startup_multiboot_info)
40    grub_fatal ("Unable to find Multiboot Information (is CONFIG_MULTIBOOT disabled in coreboot?)");
41
42  /* Move MBI to a safe place.  */
43  grub_memmove (&kern_multiboot_info, startup_multiboot_info, sizeof (struct multiboot_info));
44
45  if ((kern_multiboot_info.flags & MULTIBOOT_INFO_MEM_MAP) == 0)
46    grub_fatal ("Missing Multiboot memory information");
47
48  /* Move the memory map to a safe place.  */
49  if (kern_multiboot_info.mmap_length > sizeof (mmap_entries))
50    {
51      grub_printf ("WARNING: Memory map size exceeds limit (0x%x > 0x%x); it will be truncated\n",
52                   kern_multiboot_info.mmap_length, sizeof (mmap_entries));
53      kern_multiboot_info.mmap_length = sizeof (mmap_entries);
54    }
55  grub_memmove (mmap_entries, (void *) kern_multiboot_info.mmap_addr, kern_multiboot_info.mmap_length);
56  kern_multiboot_info.mmap_addr = (grub_uint32_t) mmap_entries;
57}
58
59grub_err_t
60grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
61{
62  struct multiboot_mmap_entry *entry = (void *) kern_multiboot_info.mmap_addr;
63
64  while ((unsigned long) entry < kern_multiboot_info.mmap_addr + kern_multiboot_info.mmap_length)
65    {
66      if (hook (entry->addr, entry->len, entry->type, hook_data))
67        break;
68
69      entry = (void *) ((grub_addr_t) entry + entry->size + sizeof (entry->size));
70    }
71
72  return 0;
73}
Note: See TracBrowser for help on using the repository browser.