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Added geometry-guessing code based on the partition table

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This commit is contained in:
Michael Brown
2006-09-08 22:22:03 +00:00
parent 21bc2015f2
commit 0566ab2a2f
2 changed files with 94 additions and 14 deletions
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39
src/arch/i386/include/int13.h
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@@ -201,6 +201,45 @@ struct int13_disk_parameters {
/** @} */
/** A C/H/S address within a partition table entry */
struct partition_chs {
/** Head number */
uint8_t head;
/** Sector number, plus high 2 bits of cylinder number */
uint8_t cyl_sector;
/** Low 8 bits of cylinder number */
uint8_t cyl;
} __attribute__ (( packed ));
#define PART_HEAD(chs) ( (chs).head )
#define PART_SECTOR(chs) ( (chs).cyl_sector & 0x3f )
#define PART_CYLINDER(chs) ( (chs).cyl | ( ( (chs).cyl_sector & 0xc0 ) << 2 ) )
/** A partition table entry within the MBR */
struct partition_table_entry {
/** Bootable flag */
uint8_t bootable;
/** C/H/S start address */
struct partition_chs chs_start;
/** System indicator (partition type) */
uint8_t type;
/** C/H/S end address */
struct partition_chs chs_end;
/** Linear start address */
uint32_t start;
/** Linear length */
uint32_t length;
} __attribute__ (( packed ));
/** A Master Boot Record */
struct master_boot_record {
uint8_t pad[446];
/** Partition table */
struct partition_table_entry partitions[4];
/** 0x55aa MBR signature */
uint16_t signature;
} __attribute__ (( packed ));
extern void register_int13_drive ( struct int13_drive *drive );
extern void unregister_int13_drive ( struct int13_drive *drive );
extern int int13_boot ( unsigned int drive );