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248 lines
6.0 KiB
C
248 lines
6.0 KiB
C
#ifndef INT13_H
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#define INT13_H
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/** @file
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*
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* INT 13 emulation
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*
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*/
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#include <stdint.h>
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#include <gpxe/list.h>
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struct block_device;
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/**
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* @defgroup int13ops INT 13 operation codes
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* @{
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*/
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/** Reset disk system */
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#define INT13_RESET 0x00
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/** Get status of last operation */
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#define INT13_GET_LAST_STATUS 0x01
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/** Read sectors */
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#define INT13_READ_SECTORS 0x02
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/** Write sectors */
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#define INT13_WRITE_SECTORS 0x03
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/** Get drive parameters */
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#define INT13_GET_PARAMETERS 0x08
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/** Get disk type */
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#define INT13_GET_DISK_TYPE 0x15
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/** Extensions installation check */
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#define INT13_EXTENSION_CHECK 0x41
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/** Extended read */
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#define INT13_EXTENDED_READ 0x42
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/** Extended write */
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#define INT13_EXTENDED_WRITE 0x43
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/** Get extended drive parameters */
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#define INT13_GET_EXTENDED_PARAMETERS 0x48
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/** @} */
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/**
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* @defgroup int13status INT 13 status codes
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* @{
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*/
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/** Operation completed successfully */
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#define INT13_STATUS_SUCCESS 0x00
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/** Invalid function or parameter */
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#define INT13_STATUS_INVALID 0x01
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/** Read error */
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#define INT13_STATUS_READ_ERROR 0x04
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/** Write error */
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#define INT13_STATUS_WRITE_ERROR 0xcc
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/** @} */
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/** Block size for non-extended INT 13 calls */
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#define INT13_BLKSIZE 512
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/** An INT 13 emulated drive */
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struct int13_drive {
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/** List of all registered drives */
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struct list_head list;
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/** Underlying block device */
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struct block_device *blockdev;
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/** BIOS drive number (0x80-0xff) */
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unsigned int drive;
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/** Number of cylinders
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*
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* The cylinder number field in an INT 13 call is ten bits
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* wide, giving a maximum of 1024 cylinders. Conventionally,
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* when the 7.8GB limit of a CHS address is exceeded, it is
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* the number of cylinders that is increased beyond the
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* addressable limit.
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*/
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unsigned int cylinders;
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/** Number of heads
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*
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* The head number field in an INT 13 call is eight bits wide,
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* giving a maximum of 256 heads. However, apparently all
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* versions of MS-DOS up to and including Win95 fail with 256
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* heads, so the maximum encountered in practice is 255.
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*/
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unsigned int heads;
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/** Number of sectors per track
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*
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* The sector number field in an INT 13 call is six bits wide,
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* giving a maximum of 63 sectors, since sector numbering
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* (unlike head and cylinder numbering) starts at 1, not 0.
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*/
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unsigned int sectors_per_track;
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/** Status of last operation */
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int last_status;
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};
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/** An INT 13 disk address packet */
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struct int13_disk_address {
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/** Size of the packet, in bytes */
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uint8_t bufsize;
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/** Reserved, must be zero */
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uint8_t reserved;
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/** Block count */
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uint16_t count;
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/** Data buffer */
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struct segoff buffer;
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/** Starting block number */
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uint64_t lba;
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/** Data buffer (EDD-3.0 only) */
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uint64_t buffer_phys;
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};
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/** INT 13 disk parameters */
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struct int13_disk_parameters {
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/** Size of this structure */
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uint16_t bufsize;
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/** Flags */
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uint16_t flags;
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/** Number of cylinders */
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uint32_t cylinders;
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/** Number of heads */
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uint32_t heads;
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/** Number of sectors per track */
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uint32_t sectors_per_track;
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/** Total number of sectors on drive */
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uint64_t sectors;
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/** Bytes per sector */
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uint16_t sector_size;
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};
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/**
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* @defgroup int13types INT 13 disk types
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* @{
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*/
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/** No such drive */
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#define INT13_DISK_TYPE_NONE 0x00
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/** Floppy without change-line support */
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#define INT13_DISK_TYPE_FDD 0x01
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/** Floppy with change-line support */
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#define INT13_DISK_TYPE_FDD_CL 0x02
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/** Hard disk */
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#define INT13_DISK_TYPE_HDD 0x03
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/** @} */
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/**
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* @defgroup int13flags INT 13 disk parameter flags
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* @{
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*/
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/** DMA boundary errors handled transparently */
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#define INT13_FL_DMA_TRANSPARENT 0x01
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/** CHS information is valid */
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#define INT13_FL_CHS_VALID 0x02
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/** Removable drive */
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#define INT13_FL_REMOVABLE 0x04
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/** Write with verify supported */
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#define INT13_FL_VERIFIABLE 0x08
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/** Has change-line supported (valid only for removable drives) */
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#define INT13_FL_CHANGE_LINE 0x10
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/** Drive can be locked (valid only for removable drives) */
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#define INT13_FL_LOCKABLE 0x20
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/** CHS is max possible, not current media (valid only for removable drives) */
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#define INT13_FL_CHS_MAX 0x40
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/** @} */
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/**
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* @defgroup int13exts INT 13 extension flags
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* @{
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*/
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/** Extended disk access functions supported */
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#define INT13_EXTENSION_LINEAR 0x01
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/** Removable drive functions supported */
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#define INT13_EXTENSION_REMOVABLE 0x02
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/** EDD functions supported */
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#define INT13_EXTENSION_EDD 0x04
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/** @} */
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/**
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* @defgroup int13vers INT 13 extension versions
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* @{
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*/
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/** INT13 extensions version 1.x */
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#define INT13_EXTENSION_VER_1_X 0x01
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/** INT13 extensions version 2.0 (EDD-1.0) */
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#define INT13_EXTENSION_VER_2_0 0x20
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/** INT13 extensions version 2.1 (EDD-1.1) */
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#define INT13_EXTENSION_VER_2_1 0x21
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/** INT13 extensions version 3.0 (EDD-3.0) */
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#define INT13_EXTENSION_VER_3_0 0x30
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/** @} */
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/** A C/H/S address within a partition table entry */
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struct partition_chs {
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/** Head number */
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uint8_t head;
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/** Sector number, plus high 2 bits of cylinder number */
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uint8_t cyl_sector;
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/** Low 8 bits of cylinder number */
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uint8_t cyl;
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} __attribute__ (( packed ));
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#define PART_HEAD(chs) ( (chs).head )
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#define PART_SECTOR(chs) ( (chs).cyl_sector & 0x3f )
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#define PART_CYLINDER(chs) ( (chs).cyl | ( ( (chs).cyl_sector & 0xc0 ) << 2 ) )
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/** A partition table entry within the MBR */
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struct partition_table_entry {
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/** Bootable flag */
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uint8_t bootable;
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/** C/H/S start address */
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struct partition_chs chs_start;
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/** System indicator (partition type) */
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uint8_t type;
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/** C/H/S end address */
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struct partition_chs chs_end;
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/** Linear start address */
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uint32_t start;
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/** Linear length */
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uint32_t length;
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} __attribute__ (( packed ));
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/** A Master Boot Record */
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struct master_boot_record {
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uint8_t pad[446];
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/** Partition table */
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struct partition_table_entry partitions[4];
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/** 0x55aa MBR signature */
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uint16_t signature;
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} __attribute__ (( packed ));
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extern void register_int13_drive ( struct int13_drive *drive );
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extern void unregister_int13_drive ( struct int13_drive *drive );
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extern int int13_boot ( unsigned int drive );
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#endif /* INT13_H */
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