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| author | H. Peter Anvin <hpa@zytor.com> | 2007-08-14 17:36:00 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2007-08-14 17:55:31 -0700 |
| commit | 9a5f35d4ede43fee791a486e0850e9e3afdde0a7 (patch) | |
| tree | 653790015cf2b8ee60fba7af52c09659d62a1174 /arch/i386 | |
| parent | c1a6e2b082a7cefe58315af7a461bbf2f33221a3 (diff) | |
| download | linux-9a5f35d4ede43fee791a486e0850e9e3afdde0a7.tar.bz2 | |
[x86 setup] edd.c: make sure MBR signatures actually get reported
When filling in the MBR signature array, the setup code failed to advance
boot_params.edd_mbr_sig_buf_entries, which resulted in the valid data
being ignored.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/boot/edd.c | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/arch/i386/boot/edd.c b/arch/i386/boot/edd.c index d65dd21c09f2..82b5c846a194 100644 --- a/arch/i386/boot/edd.c +++ b/arch/i386/boot/edd.c @@ -37,11 +37,10 @@ static int read_mbr(u8 devno, void *buf) return -(u8)ax; /* 0 or -1 */ } -static u32 read_mbr_sig(u8 devno, struct edd_info *ei) +static u32 read_mbr_sig(u8 devno, struct edd_info *ei, u32 *mbrsig) { int sector_size; char *mbrbuf_ptr, *mbrbuf_end; - u32 mbrsig; u32 buf_base, mbr_base; extern char _end[]; @@ -57,15 +56,15 @@ static u32 read_mbr_sig(u8 devno, struct edd_info *ei) /* Make sure we actually have space on the heap... */ if (!(boot_params.hdr.loadflags & CAN_USE_HEAP)) - return 0; + return -1; if (mbrbuf_end > (char *)(size_t)boot_params.hdr.heap_end_ptr) - return 0; + return -1; if (read_mbr(devno, mbrbuf_ptr)) - return 0; + return -1; - mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET]; - return mbrsig; + *mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET]; + return 0; } static int get_edd_info(u8 devno, struct edd_info *ei) @@ -132,6 +131,7 @@ void query_edd(void) int do_edd = 1; int devno; struct edd_info ei, *edp; + u32 *mbrptr; if (cmdline_find_option("edd", eddarg, sizeof eddarg) > 0) { if (!strcmp(eddarg, "skipmbr") || !strcmp(eddarg, "skip")) @@ -140,7 +140,8 @@ void query_edd(void) do_edd = 0; } - edp = (struct edd_info *)boot_params.eddbuf; + edp = boot_params.eddbuf; + mbrptr = boot_params.edd_mbr_sig_buffer; if (!do_edd) return; @@ -158,11 +159,8 @@ void query_edd(void) boot_params.eddbuf_entries++; } - if (do_mbr) { - u32 mbr_sig; - mbr_sig = read_mbr_sig(devno, &ei); - boot_params.edd_mbr_sig_buffer[devno-0x80] = mbr_sig; - } + if (do_mbr && !read_mbr_sig(devno, &ei, mbrptr++)) + boot_params.edd_mbr_sig_buf_entries = devno-0x80+1; } } |