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- #ifndef INT13_H
- #define INT13_H
-
- /** @file
- *
- * INT 13 emulation
- *
- */
-
- #include <stdint.h>
- #include <gpxe/list.h>
-
- struct block_device;
-
- /**
- * @defgroup int13ops INT 13 operation codes
- * @{
- */
-
- /** Reset disk system */
- #define INT13_RESET 0x00
- /** Get status of last operation */
- #define INT13_GET_LAST_STATUS 0x01
- /** Read sectors */
- #define INT13_READ_SECTORS 0x02
- /** Write sectors */
- #define INT13_WRITE_SECTORS 0x03
- /** Get drive parameters */
- #define INT13_GET_PARAMETERS 0x08
- /** Get disk type */
- #define INT13_GET_DISK_TYPE 0x15
- /** Extensions installation check */
- #define INT13_EXTENSION_CHECK 0x41
- /** Extended read */
- #define INT13_EXTENDED_READ 0x42
- /** Extended write */
- #define INT13_EXTENDED_WRITE 0x43
- /** Get extended drive parameters */
- #define INT13_GET_EXTENDED_PARAMETERS 0x48
- /** Get CD-ROM status / terminate emulation */
- #define INT13_CDROM_STATUS_TERMINATE 0x4b
-
- /** @} */
-
- /**
- * @defgroup int13status INT 13 status codes
- * @{
- */
-
- /** Operation completed successfully */
- #define INT13_STATUS_SUCCESS 0x00
- /** Invalid function or parameter */
- #define INT13_STATUS_INVALID 0x01
- /** Read error */
- #define INT13_STATUS_READ_ERROR 0x04
- /** Write error */
- #define INT13_STATUS_WRITE_ERROR 0xcc
-
- /** @} */
-
- /** Block size for non-extended INT 13 calls */
- #define INT13_BLKSIZE 512
-
- /** An INT 13 emulated drive */
- struct int13_drive {
- /** List of all registered drives */
- struct list_head list;
-
- /** Underlying block device */
- struct block_device *blockdev;
-
- /** BIOS in-use drive number (0x80-0xff) */
- unsigned int drive;
- /** BIOS natural drive number (0x80-0xff)
- *
- * This is the drive number that would have been assigned by
- * 'naturally' appending the drive to the end of the BIOS
- * drive list.
- *
- * If the emulated drive replaces a preexisting drive, this is
- * the drive number that the preexisting drive gets remapped
- * to.
- */
- unsigned int natural_drive;
-
- /** Number of cylinders
- *
- * The cylinder number field in an INT 13 call is ten bits
- * wide, giving a maximum of 1024 cylinders. Conventionally,
- * when the 7.8GB limit of a CHS address is exceeded, it is
- * the number of cylinders that is increased beyond the
- * addressable limit.
- */
- unsigned int cylinders;
- /** Number of heads
- *
- * The head number field in an INT 13 call is eight bits wide,
- * giving a maximum of 256 heads. However, apparently all
- * versions of MS-DOS up to and including Win95 fail with 256
- * heads, so the maximum encountered in practice is 255.
- */
- unsigned int heads;
- /** Number of sectors per track
- *
- * The sector number field in an INT 13 call is six bits wide,
- * giving a maximum of 63 sectors, since sector numbering
- * (unlike head and cylinder numbering) starts at 1, not 0.
- */
- unsigned int sectors_per_track;
-
- /** Status of last operation */
- int last_status;
- };
-
- /** An INT 13 disk address packet */
- struct int13_disk_address {
- /** Size of the packet, in bytes */
- uint8_t bufsize;
- /** Reserved, must be zero */
- uint8_t reserved;
- /** Block count */
- uint16_t count;
- /** Data buffer */
- struct segoff buffer;
- /** Starting block number */
- uint64_t lba;
- /** Data buffer (EDD-3.0 only) */
- uint64_t buffer_phys;
- } __attribute__ (( packed ));
-
- /** INT 13 disk parameters */
- struct int13_disk_parameters {
- /** Size of this structure */
- uint16_t bufsize;
- /** Flags */
- uint16_t flags;
- /** Number of cylinders */
- uint32_t cylinders;
- /** Number of heads */
- uint32_t heads;
- /** Number of sectors per track */
- uint32_t sectors_per_track;
- /** Total number of sectors on drive */
- uint64_t sectors;
- /** Bytes per sector */
- uint16_t sector_size;
-
- } __attribute__ (( packed ));
-
- /**
- * @defgroup int13types INT 13 disk types
- * @{
- */
-
- /** No such drive */
- #define INT13_DISK_TYPE_NONE 0x00
- /** Floppy without change-line support */
- #define INT13_DISK_TYPE_FDD 0x01
- /** Floppy with change-line support */
- #define INT13_DISK_TYPE_FDD_CL 0x02
- /** Hard disk */
- #define INT13_DISK_TYPE_HDD 0x03
-
- /** @} */
-
- /**
- * @defgroup int13flags INT 13 disk parameter flags
- * @{
- */
-
- /** DMA boundary errors handled transparently */
- #define INT13_FL_DMA_TRANSPARENT 0x01
- /** CHS information is valid */
- #define INT13_FL_CHS_VALID 0x02
- /** Removable drive */
- #define INT13_FL_REMOVABLE 0x04
- /** Write with verify supported */
- #define INT13_FL_VERIFIABLE 0x08
- /** Has change-line supported (valid only for removable drives) */
- #define INT13_FL_CHANGE_LINE 0x10
- /** Drive can be locked (valid only for removable drives) */
- #define INT13_FL_LOCKABLE 0x20
- /** CHS is max possible, not current media (valid only for removable drives) */
- #define INT13_FL_CHS_MAX 0x40
-
- /** @} */
-
- /**
- * @defgroup int13exts INT 13 extension flags
- * @{
- */
-
- /** Extended disk access functions supported */
- #define INT13_EXTENSION_LINEAR 0x01
- /** Removable drive functions supported */
- #define INT13_EXTENSION_REMOVABLE 0x02
- /** EDD functions supported */
- #define INT13_EXTENSION_EDD 0x04
-
- /** @} */
-
- /**
- * @defgroup int13vers INT 13 extension versions
- * @{
- */
-
- /** INT13 extensions version 1.x */
- #define INT13_EXTENSION_VER_1_X 0x01
- /** INT13 extensions version 2.0 (EDD-1.0) */
- #define INT13_EXTENSION_VER_2_0 0x20
- /** INT13 extensions version 2.1 (EDD-1.1) */
- #define INT13_EXTENSION_VER_2_1 0x21
- /** INT13 extensions version 3.0 (EDD-3.0) */
- #define INT13_EXTENSION_VER_3_0 0x30
-
- /** @} */
-
- /** Bootable CD-ROM specification packet */
- struct int13_cdrom_specification {
- /** Size of packet in bytes */
- uint8_t size;
- /** Boot media type */
- uint8_t media_type;
- /** Drive number */
- uint8_t drive;
- /** CD-ROM controller number */
- uint8_t controller;
- /** LBA of disk image to emulate */
- uint32_t lba;
- /** Device specification */
- uint16_t device;
- /** Segment of 3K buffer for caching CD-ROM reads */
- uint16_t cache_segment;
- /** Load segment for initial boot image */
- uint16_t load_segment;
- /** Number of 512-byte sectors to load */
- uint16_t load_sectors;
- /** Low 8 bits of cylinder number */
- uint8_t cyl;
- /** Sector number, plus high 2 bits of cylinder number */
- uint8_t cyl_sector;
- /** Head number */
- uint8_t head;
- } __attribute__ (( packed ));
-
- /** 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 );
-
- #endif /* INT13_H */
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