b97b7b914b
* kern/i386/multiboot_mmap.c (grub_machine_mmap_init): Improve
error message for excessively large memory map.
87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/machine/init.h>
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#include <grub/machine/memory.h>
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#include <grub/types.h>
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#include <grub/multiboot.h>
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#include <grub/err.h>
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#include <grub/misc.h>
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grub_size_t grub_lower_mem, grub_upper_mem;
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/* A pointer to the MBI in its initial location. */
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struct grub_multiboot_info *startup_multiboot_info;
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/* The MBI has to be copied to our BSS so that it won't be
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overwritten. This is its final location. */
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static struct grub_multiboot_info kern_multiboot_info;
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/* Unfortunately we can't use heap at this point. But 32 looks like a sane
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limit (used by memtest86). */
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static grub_uint8_t mmap_entries[sizeof (struct grub_multiboot_mmap_entry) * 32];
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void
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grub_machine_mmap_init ()
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{
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if (! startup_multiboot_info)
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grub_fatal ("Unable to find Multiboot Information (is CONFIG_MULTIBOOT disabled in coreboot?)");
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/* Move MBI to a safe place. */
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grub_memmove (&kern_multiboot_info, startup_multiboot_info, sizeof (struct grub_multiboot_info));
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if ((kern_multiboot_info.flags & MULTIBOOT_INFO_MEM_MAP) == 0)
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grub_fatal ("Missing Multiboot memory information");
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/* Move the memory map to a safe place. */
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if (kern_multiboot_info.mmap_length > sizeof (mmap_entries))
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{
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grub_printf ("WARNING: Memory map size exceeds limit (0x%x > 0x%x); it will be truncated\n",
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kern_multiboot_info.mmap_length, sizeof (mmap_entries));
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kern_multiboot_info.mmap_length = sizeof (mmap_entries);
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}
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grub_memmove (mmap_entries, (void *) kern_multiboot_info.mmap_addr, kern_multiboot_info.mmap_length);
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kern_multiboot_info.mmap_addr = (grub_uint32_t) mmap_entries;
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if ((kern_multiboot_info.flags & MULTIBOOT_INFO_MEMORY) == 0)
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{
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grub_lower_mem = GRUB_MEMORY_MACHINE_LOWER_USABLE;
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grub_upper_mem = 0;
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}
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else
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{
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grub_lower_mem = kern_multiboot_info.mem_lower * 1024;
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grub_upper_mem = kern_multiboot_info.mem_upper * 1024;
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}
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}
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grub_err_t
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grub_machine_mmap_iterate (int NESTED_FUNC_ATTR (*hook) (grub_uint64_t, grub_uint64_t, grub_uint32_t))
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{
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struct grub_multiboot_mmap_entry *entry = (void *) kern_multiboot_info.mmap_addr;
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while ((unsigned long) entry < kern_multiboot_info.mmap_addr + kern_multiboot_info.mmap_length)
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{
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if (hook (entry->addr, entry->len, entry->type))
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break;
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entry = (void *) ((grub_addr_t) entry + entry->size + sizeof (entry->size));
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}
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return 0;
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}
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