Messages in this thread Patch in this message | | | Date | Tue, 15 Nov 2011 14:42:38 +0800 | From | wangyanqing <> | Subject | [PATCH -V1] x86: make executable for video bios area |
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5bd5a452662bc37c54fb6828db1a3faf87e6511c make area between BIOS_BEGIN and BIOS_END have NX protection when boot machine with acpi enable(acpi will disable pcibios).
This commit make my machine can't boot, system hang with black screen very early when I enable CONFIG_FB_UVESA, CONFIG_X86_PAE, CONFIG_ACPI.
below is the maps when boot normal without acpi: 00000000-00001000 rw-s 00000000 00:01 822 /dev/mem 00009000-0000a000 r-xp 00001000 00:01 912 /sbin/v86d 00010000-00050000 rwxp 00000000 00:01 818 /dev/zero 000a0000-000c0000 rw-s 000a0000 00:01 822 /dev/mem 000c0000-00100000 r-xs 000c0000 00:01 822 /dev/mem <== must executable 08048000-0804c000 r-xp 00001000 00:01 912 /sbin/v86d 0804c000-0804d000 rw-p 00004000 00:01 912 /sbin/v86d b7875000-b7876000 r-xp 00000000 00:00 0 [vdso] bfe9d000-bfebe000 rw-p 00000000 00:00 0 [stack]
So I prepare this patch.It works with me. Any comment is welcome.
Thanks.
Signed-off-by: Wang YanQing <Udknight@gmail.com> --- arch/x86/include/asm/e820.h | 2 ++ arch/x86/mm/pageattr.c | 3 ++- 2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h index 908b969..a6fa897 100644 --- a/arch/x86/include/asm/e820.h +++ b/arch/x86/include/asm/e820.h @@ -72,6 +72,8 @@ struct e820map { #define BIOS_BEGIN 0x000a0000 #define BIOS_END 0x00100000 +#define BIOS_VIDEO 0x000c0000 + #define BIOS_ROM_BASE 0xffe00000 #define BIOS_ROM_END 0xffffffff diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index f9e5267..12acac0 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -260,7 +260,8 @@ static inline pgprot_t static_protections(pgprot_t prot, unsigned long address, * PCI BIOS based config access (CONFIG_PCI_GOBIOS) support. */ #ifdef CONFIG_PCI_BIOS - if (pcibios_enabled && within(pfn, BIOS_BEGIN >> PAGE_SHIFT, BIOS_END >> PAGE_SHIFT)) + if ((pcibios_enabled || within(pfn, BIOS_VIDEO >> PAGE_SHIFT, BIOS_END >> PAGE_SHIFT)) && + within(pfn, BIOS_BEGIN >> PAGE_SHIFT, BIOS_END >> PAGE_SHIFT)) pgprot_val(forbidden) |= _PAGE_NX; #endif -- 1.7.3.4
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