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authorH. Peter Anvin <hpa@zytor.com>2007-08-14 17:36:00 -0700
committerH. Peter Anvin <hpa@zytor.com>2007-08-14 17:55:31 -0700
commit9a5f35d4ede43fee791a486e0850e9e3afdde0a7 (patch)
tree653790015cf2b8ee60fba7af52c09659d62a1174 /arch
parentc1a6e2b082a7cefe58315af7a461bbf2f33221a3 (diff)
[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')
-rw-r--r--arch/i386/boot/edd.c24
1 files changed, 11 insertions, 13 deletions
diff --git a/arch/i386/boot/edd.c b/arch/i386/boot/edd.c
index d65dd21c09f..82b5c846a19 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;
}
}