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[int13] Include disk signature in debugging output 

The disk signature is used by some OSes (notably Windows) to identify
the boot disk, so it's useful debugging information to have.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/1/head
Michael Brown 2010-09-22 21:39:01 +01:00
parent 29ad8a922b
commit 4a30637d38
2 changed files with 9 additions and 2 deletions
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9
src/arch/i386/include/int13.h
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@ -249,11 +249,16 @@ struct partition_table_entry {
/** A Master Boot Record */ /** A Master Boot Record */
struct master_boot_record { struct master_boot_record {
uint8_t pad[446]; /** Code area */
uint8_t code[440];
/** Disk signature */
uint32_t signature;
/** Padding */
uint8_t pad[2];
/** Partition table */ /** Partition table */
struct partition_table_entry partitions[4]; struct partition_table_entry partitions[4];
/** 0x55aa MBR signature */ /** 0x55aa MBR signature */
uint16_t signature; uint16_t magic;
} __attribute__ (( packed )); } __attribute__ (( packed ));
/** Use natural BIOS drive number */ /** Use natural BIOS drive number */

2
src/arch/i386/interface/pcbios/int13.c
View File

@ -368,6 +368,8 @@ static int int13_guess_geometry ( struct int13_drive *int13 ) {
int13->drive, strerror ( rc ) ); int13->drive, strerror ( rc ) );
return rc; return rc;
} }
DBGC ( int13, "INT13 drive %02x has signature %08x\n",
int13->drive, mbr.signature );
/* Scan through partition table and modify guesses for heads /* Scan through partition table and modify guesses for heads
* and sectors_per_track if we find any used partitions. * and sectors_per_track if we find any used partitions.