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author | Huang, Ying <ying.huang@intel.com> | 2008-02-13 17:22:41 +0800 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-02-13 16:20:35 +0100 |
commit | 4de0d4a6d173351b023ab2855c3d331146a418e5 (patch) | |
tree | 59fd58a74fc693e8b7c2b769180abc8bcbd2df61 /arch/x86/kernel/efi.c | |
parent | e85f20518bb928667508c22090c85d458e25a4f7 (diff) | |
download | kernel_samsung_smdk4412-4de0d4a6d173351b023ab2855c3d331146a418e5.zip kernel_samsung_smdk4412-4de0d4a6d173351b023ab2855c3d331146a418e5.tar.gz kernel_samsung_smdk4412-4de0d4a6d173351b023ab2855c3d331146a418e5.tar.bz2 |
x86: EFI runtime code mapping enhancement
This patch enhances EFI runtime code memory mapping as following:
- Move __supported_pte_mask & _PAGE_NX checking before invoking
runtime_code_page_mkexec(). This makes it possible for compiler to
eliminate runtime_code_page_mkexec() on machine without NX support.
- Use set_memory_x/nx in early_mapping_set_exec(). This eliminates the
duplicated implementation.
This patch has been tested on Intel x86_64 platform with EFI64/32
firmware.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/efi.c')
-rw-r--r-- | arch/x86/kernel/efi.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/x86/kernel/efi.c b/arch/x86/kernel/efi.c index b4d5232..cbdf9ba 100644 --- a/arch/x86/kernel/efi.c +++ b/arch/x86/kernel/efi.c @@ -384,9 +384,6 @@ static void __init runtime_code_page_mkexec(void) efi_memory_desc_t *md; void *p; - if (!(__supported_pte_mask & _PAGE_NX)) - return; - /* Make EFI runtime service code area executable */ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { md = p; @@ -476,7 +473,8 @@ void __init efi_enter_virtual_mode(void) efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; efi.reset_system = virt_efi_reset_system; efi.set_virtual_address_map = virt_efi_set_virtual_address_map; - runtime_code_page_mkexec(); + if (__supported_pte_mask & _PAGE_NX) + runtime_code_page_mkexec(); early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); memmap.map = NULL; } |