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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-15 11:31:54 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-15 11:31:54 +1100 |
| commit | 6dc6472581f693b5fc95aebedf67b4960fb85cf0 (patch) | |
| tree | 06a5a9a08519950575505273eabced331ed51405 /arch/x86/boot/edd.c | |
| parent | ee673eaa72d8d185012b1027a05e25aba18c267f (diff) | |
| parent | 8acd3a60bcca17c6d89c73cee3ad6057eb83ba1e (diff) | |
Merge commit 'origin'
Manual fixup of conflicts on:
arch/powerpc/include/asm/dcr-regs.h
drivers/net/ibm_newemac/core.h
Diffstat (limited to 'arch/x86/boot/edd.c')
| -rw-r--r-- | arch/x86/boot/edd.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/boot/edd.c b/arch/x86/boot/edd.c index d93cbc6464d0..1aae8f3e5ca1 100644 --- a/arch/x86/boot/edd.c +++ b/arch/x86/boot/edd.c @@ -41,6 +41,7 @@ static u32 read_mbr_sig(u8 devno, struct edd_info *ei, u32 *mbrsig) char *mbrbuf_ptr, *mbrbuf_end; u32 buf_base, mbr_base; extern char _end[]; + u16 mbr_magic; sector_size = ei->params.bytes_per_sector; if (!sector_size) @@ -58,11 +59,15 @@ static u32 read_mbr_sig(u8 devno, struct edd_info *ei, u32 *mbrsig) if (mbrbuf_end > (char *)(size_t)boot_params.hdr.heap_end_ptr) return -1; + memset(mbrbuf_ptr, 0, sector_size); if (read_mbr(devno, mbrbuf_ptr)) return -1; *mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET]; - return 0; + mbr_magic = *(u16 *)&mbrbuf_ptr[510]; + + /* check for valid MBR magic */ + return mbr_magic == 0xAA55 ? 0 : -1; } static int get_edd_info(u8 devno, struct edd_info *ei) |