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121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
#ifndef _INT13_H
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#define _INT13_H
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/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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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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/** Construct a pointer from a real-mode segment:offset address */
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#define REAL_PTR( segment, offset ) \
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( ( void * ) ( intptr_t ) ( ( (segment) << 4 ) + offset ) )
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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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/** Get extended drive parameters */
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#define INT13_GET_EXTENDED_PARAMETERS 0x48
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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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/** 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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/** Extended disk access functions supported */
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#define INT13_EXTENSION_LINEAR 0x01
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/** INT13 extensions version 1.x */
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#define INT13_EXTENSION_VER_1_X 0x01
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/** DMA boundary errors handled transparently */
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#define INT13_FL_DMA_TRANSPARENT 0x01
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/** BIOS drive counter */
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#define INT13_DRIVE_COUNT ( *( ( ( uint8_t * ) REAL_PTR ( 0x40, 0x75 ) ) ) )
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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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} __attribute__ (( packed ));
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extern int initialise_int13 ( void );
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extern void emulate_int13 ( struct bootapp_callback_params *params );
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#endif /* _INT13_H */
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