wimboot/wimboot-2.7.3/src/int13.h

   1 #ifndef _INT13_H
   2 #define _INT13_H
   3
   4 /*
   5  * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  */
  22
  23 /**
  24  * @file
  25  *
  26  * INT 13 emulation
  27  *
  28  */
  29
  30 /** Construct a pointer from a real-mode segment:offset address */
  31 #define REAL_PTR( segment, offset ) \
  32         ( ( void * ) ( intptr_t ) ( ( (segment) << 4 ) + offset ) )
  33
  34 /** Get drive parameters */
  35 #define INT13_GET_PARAMETERS            0x08
  36 /** Get disk type */
  37 #define INT13_GET_DISK_TYPE             0x15
  38 /** Extensions installation check */
  39 #define INT13_EXTENSION_CHECK           0x41
  40 /** Extended read */
  41 #define INT13_EXTENDED_READ             0x42
  42 /** Get extended drive parameters */
  43 #define INT13_GET_EXTENDED_PARAMETERS   0x48
  44
  45 /** Operation completed successfully */
  46 #define INT13_STATUS_SUCCESS            0x00
  47 /** Invalid function or parameter */
  48 #define INT13_STATUS_INVALID            0x01
  49 /** Read error */
  50 #define INT13_STATUS_READ_ERROR         0x04
  51 /** Reset failed */
  52 #define INT13_STATUS_RESET_FAILED       0x05
  53 /** Write error */
  54 #define INT13_STATUS_WRITE_ERROR        0xcc
  55
  56 /** No such drive */
  57 #define INT13_DISK_TYPE_NONE            0x00
  58 /** Floppy without change-line support */
  59 #define INT13_DISK_TYPE_FDD             0x01
  60 /** Floppy with change-line support */
  61 #define INT13_DISK_TYPE_FDD_CL          0x02
  62 /** Hard disk */
  63 #define INT13_DISK_TYPE_HDD             0x03
  64
  65 /** Extended disk access functions supported */
  66 #define INT13_EXTENSION_LINEAR          0x01
  67
  68 /** INT13 extensions version 1.x */
  69 #define INT13_EXTENSION_VER_1_X         0x01
  70
  71 /** DMA boundary errors handled transparently */
  72 #define INT13_FL_DMA_TRANSPARENT        0x01
  73
  74 /** BIOS drive counter */
  75 #define INT13_DRIVE_COUNT ( *( ( ( uint8_t * ) REAL_PTR ( 0x40, 0x75 ) ) ) )
  76
  77 /** An INT 13 disk address packet */
  78 struct int13_disk_address {
  79         /** Size of the packet, in bytes */
  80         uint8_t bufsize;
  81         /** Reserved */
  82         uint8_t reserved_a;
  83         /** Block count */
  84         uint8_t count;
  85         /** Reserved */
  86         uint8_t reserved_b;
  87         /** Data buffer */
  88         struct segoff buffer;
  89         /** Starting block number */
  90         uint64_t lba;
  91         /** Data buffer (EDD 3.0+ only) */
  92         uint64_t buffer_phys;
  93         /** Block count (EDD 4.0+ only) */
  94         uint32_t long_count;
  95         /** Reserved */
  96         uint32_t reserved_c;
  97 } __attribute__ (( packed ));
  98
  99 /** INT 13 disk parameters */
 100 struct int13_disk_parameters {
 101         /** Size of this structure */
 102         uint16_t bufsize;
 103         /** Flags */
 104         uint16_t flags;
 105         /** Number of cylinders */
 106         uint32_t cylinders;
 107         /** Number of heads */
 108         uint32_t heads;
 109         /** Number of sectors per track */
 110         uint32_t sectors_per_track;
 111         /** Total number of sectors on drive */
 112         uint64_t sectors;
 113         /** Bytes per sector */
 114         uint16_t sector_size;
 115 } __attribute__ (( packed ));
 116
 117 extern int initialise_int13 ( void );
 118 extern void emulate_int13 ( struct bootapp_callback_params *params );
 119
 120 #endif /* _INT13_H */