1 files changed, 292 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/include/int13.h b/contrib/syslinux-4.02/gpxe/src/arch/i386/include/int13.h
new file mode 100644
index 0000000..e1884d9
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/include/int13.h
@@ -0,0 +1,292 @@
+#ifndef INT13_H
+#define INT13_H
+
+/** @file
+ *
+ * INT 13 emulation
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <gpxe/list.h>
+#include <realmode.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 */