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x86: reserve EFI memory map with reserve_early

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This patch reserves the EFI memory map with reserve_early(). Because EFI
memory map is allocated by bootloader, if it is not reserved by
reserved_early(), it may be overwritten through address returned by
find_e820_area().

Signed-off-by: Huang Ying <ying.huang@intel.com>
Cc: andi@firstfloor.org
Cc: mingo@redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Huang, Ying
2008-06-02 14:26:21 +08:00
committed by Thomas Gleixner
parent d0ec2c6f2c
commit ecacf09f7d
5 changed files with 28 additions and 25 deletions
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33
arch/x86/kernel/efi.c
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@@ -238,6 +238,23 @@ static void __init add_efi_memmap(void)
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
}
void __init efi_reserve_early(void)
{
unsigned long pmap;
pmap = boot_params.efi_info.efi_memmap;
#ifdef CONFIG_X86_64
pmap += (__u64)boot_params.efi_info.efi_memmap_hi << 32;
#endif
memmap.phys_map = (void *)pmap;
memmap.nr_map = boot_params.efi_info.efi_memmap_size /
boot_params.efi_info.efi_memdesc_size;
memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
"EFI memmap");
}
#if EFI_DEBUG
static void __init print_efi_memmap(void)
{
@@ -267,21 +284,11 @@ void __init efi_init(void)
int i = 0;
void *tmp;
#ifdef CONFIG_X86_32
efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
#else
efi_phys.systab = (efi_system_table_t *)
(boot_params.efi_info.efi_systab |
((__u64)boot_params.efi_info.efi_systab_hi<<32));
memmap.phys_map = (void *)
(boot_params.efi_info.efi_memmap |
((__u64)boot_params.efi_info.efi_memmap_hi<<32));
#ifdef CONFIG_X86_64
efi_phys.systab = (void *)efi_phys.systab +
((__u64)boot_params.efi_info.efi_systab_hi<<32);
#endif
memmap.nr_map = boot_params.efi_info.efi_memmap_size /
boot_params.efi_info.efi_memdesc_size;
memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
efi.systab = early_ioremap((unsigned long)efi_phys.systab,
sizeof(efi_system_table_t));