blob: e8f4f34b96f6af8af126588b29f74fd52dbccfc9 [file] [log] [blame]
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <>.
#include <grub/machine/memory.h>
#include <grub/types.h>
#include <grub/multiboot.h>
#include <grub/err.h>
#include <grub/misc.h>
/* A pointer to the MBI in its initial location. */
struct multiboot_info *startup_multiboot_info;
/* The MBI has to be copied to our BSS so that it won't be
overwritten. This is its final location. */
static struct multiboot_info kern_multiboot_info;
/* Unfortunately we can't use heap at this point. But 32 looks like a sane
limit (used by memtest86). */
static grub_uint8_t mmap_entries[sizeof (struct multiboot_mmap_entry) * 32];
grub_machine_mmap_init (void)
if (! startup_multiboot_info)
grub_fatal ("Unable to find Multiboot Information (is CONFIG_MULTIBOOT disabled in coreboot?)");
/* Move MBI to a safe place. */
grub_memmove (&kern_multiboot_info, startup_multiboot_info, sizeof (struct multiboot_info));
if ((kern_multiboot_info.flags & MULTIBOOT_INFO_MEM_MAP) == 0)
grub_fatal ("Missing Multiboot memory information");
/* Move the memory map to a safe place. */
if (kern_multiboot_info.mmap_length > sizeof (mmap_entries))
grub_printf ("WARNING: Memory map size exceeds limit (0x%x > 0x%x); it will be truncated\n",
kern_multiboot_info.mmap_length, sizeof (mmap_entries));
kern_multiboot_info.mmap_length = sizeof (mmap_entries);
grub_memmove (mmap_entries, (void *) kern_multiboot_info.mmap_addr, kern_multiboot_info.mmap_length);
kern_multiboot_info.mmap_addr = (grub_uint32_t) mmap_entries;
grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
struct multiboot_mmap_entry *entry = (void *) kern_multiboot_info.mmap_addr;
while ((unsigned long) entry < kern_multiboot_info.mmap_addr + kern_multiboot_info.mmap_length)
if (hook (entry->addr, entry->len, entry->type, hook_data))
entry = (void *) ((grub_addr_t) entry + entry->size + sizeof (entry->size));
return 0;