334 lines
8.2 KiB
C
334 lines
8.2 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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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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#include <ipxe/list.h>
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#include <ipxe/edd.h>
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#include <realmode.h>
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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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/** Verify sectors */
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#define INT13_EXTENDED_VERIFY 0x44
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/** Extended seek */
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#define INT13_EXTENDED_SEEK 0x47
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/** Get extended drive parameters */
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#define INT13_GET_EXTENDED_PARAMETERS 0x48
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/** Get CD-ROM status / terminate emulation */
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#define INT13_CDROM_STATUS_TERMINATE 0x4b
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/** Read CD-ROM boot catalog */
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#define INT13_CDROM_READ_BOOT_CATALOG 0x4d
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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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/** Reset failed */
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#define INT13_STATUS_RESET_FAILED 0x05
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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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/** @defgroup int13fddtype INT 13 floppy disk drive types
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* @{
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*/
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/** 360K */
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#define INT13_FDD_TYPE_360K 0x01
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/** 1.2M */
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#define INT13_FDD_TYPE_1M2 0x02
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/** 720K */
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#define INT13_FDD_TYPE_720K 0x03
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/** 1.44M */
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#define INT13_FDD_TYPE_1M44 0x04
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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 */
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uint8_t reserved_a;
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/** Block count */
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uint8_t count;
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/** Reserved */
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uint8_t reserved_b;
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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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/** Block count (EDD 4.0+ only) */
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uint32_t long_count;
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/** Reserved */
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uint32_t reserved_c;
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} __attribute__ (( packed ));
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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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/** Device parameter table extension */
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struct segoff dpte;
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/** Device path information */
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struct edd_device_path_information dpi;
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} __attribute__ (( packed ));
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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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/** 64-bit extensions are present */
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#define INT13_EXTENSION_64BIT 0x08
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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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/** Maximum number of sectors for which CHS geometry is allowed to be valid
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*
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* This number is taken from the EDD specification.
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*/
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#define INT13_MAX_CHS_SECTORS 15482880
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/** Bootable CD-ROM specification packet */
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struct int13_cdrom_specification {
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/** Size of packet in bytes */
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uint8_t size;
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/** Boot media type */
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uint8_t media_type;
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/** Drive number */
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uint8_t drive;
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/** CD-ROM controller number */
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uint8_t controller;
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/** LBA of disk image to emulate */
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uint32_t lba;
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/** Device specification */
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uint16_t device;
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/** Segment of 3K buffer for caching CD-ROM reads */
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uint16_t cache_segment;
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/** Load segment for initial boot image */
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uint16_t load_segment;
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/** Number of 512-byte sectors to load */
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uint16_t load_sectors;
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/** Low 8 bits of cylinder number */
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uint8_t cyl;
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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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/** Head number */
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uint8_t head;
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} __attribute__ (( packed ));
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/** Bootable CD-ROM boot catalog command packet */
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struct int13_cdrom_boot_catalog_command {
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/** Size of packet in bytes */
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uint8_t size;
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/** Number of sectors of boot catalog to read */
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uint8_t count;
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/** Buffer for boot catalog */
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uint32_t buffer;
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/** First sector in boot catalog to transfer */
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uint16_t start;
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} __attribute__ (( packed ));
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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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/** Code area */
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uint8_t code[440];
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/** Disk signature */
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uint32_t signature;
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/** Padding */
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uint8_t pad[2];
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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 magic;
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} __attribute__ (( packed ));
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/** MBR magic signature */
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#define INT13_MBR_MAGIC 0xaa55
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/** A floppy disk geometry */
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struct int13_fdd_geometry {
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/** Number of tracks */
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uint8_t tracks;
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/** Number of heads and sectors per track */
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uint8_t heads_spt;
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};
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/** Define a floppy disk geometry */
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#define INT13_FDD_GEOMETRY( cylinders, heads, sectors ) \
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{ \
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.tracks = (cylinders), \
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.heads_spt = ( ( (heads) << 6 ) | (sectors) ), \
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}
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/** Get floppy disk number of cylinders */
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#define INT13_FDD_CYLINDERS( geometry ) ( (geometry)->tracks )
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/** Get floppy disk number of heads */
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#define INT13_FDD_HEADS( geometry ) ( (geometry)->heads_spt >> 6 )
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/** Get floppy disk number of sectors per track */
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#define INT13_FDD_SECTORS( geometry ) ( (geometry)->heads_spt & 0x3f )
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/** A floppy drive parameter table */
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struct int13_fdd_parameters {
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uint8_t step_rate__head_unload;
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uint8_t head_load__ndma;
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uint8_t motor_off_delay;
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uint8_t bytes_per_sector;
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uint8_t sectors_per_track;
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uint8_t gap_length;
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uint8_t data_length;
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uint8_t format_gap_length;
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uint8_t format_filler;
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uint8_t head_settle_time;
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uint8_t motor_start_time;
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} __attribute__ (( packed ));
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#endif /* INT13_H */
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