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| author |   Yinghai Lu <yinghai@kernel.org> | 2010-01-22 11:21:04 +0800 |
|---|---|---|
| committer |   H. Peter Anvin <hpa@zytor.com> | 2010-02-01 16:58:17 -0800 |
| commit | 1b5576e69a5fe168c08a159685ac366316ac9bbc (patch) | |
| tree | 0f5948f32578e1b74edb86ff8008ef42faa7f32f /arch/x86/kernel/setup.c | |
| parent | Move page_is_ram() declaration to mm.h (diff) | |
| download | linux-dev-1b5576e69a5fe168c08a159685ac366316ac9bbc.tar.xz linux-dev-1b5576e69a5fe168c08a159685ac366316ac9bbc.zip | |
x86: Remove BIOS data range from e820
In preparation for moving to the generic page_is_ram(), make explicit
what we expect to be reserved and not reserved.
Tested-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20100122033004.335813103@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/setup.c')
| -rw-r--r-- | arch/x86/kernel/setup.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index cdb6a8a506dd..f9b1f4e5ab74 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -650,6 +650,23 @@ static struct dmi_system_id __initdata bad_bios_dmi_table[] = { {} }; +static void __init trim_bios_range(void) +{ + /* + * A special case is the first 4Kb of memory; + * This is a BIOS owned area, not kernel ram, but generally + * not listed as such in the E820 table. + */ + e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED); + /* + * special case: Some BIOSen report the PC BIOS + * area (640->1Mb) as ram even though it is not. + * take them out. + */ + e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); + sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); +} + /* * Determine if we were loaded by an EFI loader. If so, then we have also been * passed the efi memmap, systab, etc., so we should use these data structures @@ -813,7 +830,7 @@ void __init setup_arch(char **cmdline_p) insert_resource(&iomem_resource, &data_resource); insert_resource(&iomem_resource, &bss_resource); - + trim_bios_range(); #ifdef CONFIG_X86_32 if (ppro_with_ram_bug()) { e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, |