| 1 | /* $Id: ebda.h 104194 2024-04-05 14:39:02Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PC BIOS - EBDA (Extended BIOS Data Area) Definition
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | * --------------------------------------------------------------------
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| 27 | *
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| 28 | * This code is based on:
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| 29 | *
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| 30 | * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
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| 31 | *
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| 32 | * Copyright (C) 2002 MandrakeSoft S.A.
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| 33 | *
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| 34 | * MandrakeSoft S.A.
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| 35 | * 43, rue d'Aboukir
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| 36 | * 75002 Paris - France
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| 37 | * http://www.linux-mandrake.com/
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| 38 | * http://www.mandrakesoft.com/
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| 39 | *
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| 40 | * This library is free software; you can redistribute it and/or
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| 41 | * modify it under the terms of the GNU Lesser General Public
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| 42 | * License as published by the Free Software Foundation; either
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| 43 | * version 2 of the License, or (at your option) any later version.
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| 44 | *
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| 45 | * This library is distributed in the hope that it will be useful,
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| 46 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 47 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 48 | * Lesser General Public License for more details.
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| 49 | *
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| 50 | * You should have received a copy of the GNU Lesser General Public
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| 51 | * License along with this library; if not, write to the Free Software
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| 52 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 53 | *
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| 54 | */
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| 55 |
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| 56 | /*
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| 57 | * Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
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| 58 | * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
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| 59 | * the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
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| 60 | * a choice of LGPL license versions is made available with the language indicating
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| 61 | * that LGPLv2 or any later version may be used, or where a choice of which version
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| 62 | * of the LGPL is applied is otherwise unspecified.
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| 63 | */
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| 64 |
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| 65 | #ifndef VBOX_INCLUDED_SRC_PC_BIOS_ebda_h
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| 66 | #define VBOX_INCLUDED_SRC_PC_BIOS_ebda_h
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| 67 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 68 | # pragma once
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| 69 | #endif
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| 70 |
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| 71 | #include <stdint.h>
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| 72 |
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| 73 | /* Must be defined here (EBDA structures depend on these). */
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| 74 | #define BX_MAX_ATA_INTERFACES 4
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| 75 | #define BX_MAX_ATA_DEVICES (BX_MAX_ATA_INTERFACES*2)
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| 76 |
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| 77 | #define BX_USE_ATADRV 1
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| 78 | #define BX_ELTORITO_BOOT 1
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| 79 |
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| 80 | #define VBOX_IS_ATA_DEVICE(device_id) (device_id < BX_MAX_ATA_DEVICES)
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| 81 |
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| 82 | #ifdef VBOX_WITH_SCSI
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| 83 | /* Enough for now */
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| 84 | #define BX_MAX_SCSI_DEVICES 4
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| 85 | /* A SCSI device starts always at BX_MAX_ATA_DEVICES. */
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| 86 | #define VBOX_IS_SCSI_DEVICE(device_id) (device_id >= BX_MAX_ATA_DEVICES)
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| 87 | #define VBOX_GET_SCSI_DEVICE(device_id) (device_id - BX_MAX_ATA_DEVICES)
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| 88 | #else
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| 89 | #define BX_MAX_SCSI_DEVICES 0
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| 90 | #define VBOX_IS_SCSI_DEVICE(device_id) (1 == 0)
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| 91 | #endif
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| 92 |
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| 93 | #ifdef VBOX_WITH_AHCI
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| 94 | /* Four should be enough for now */
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| 95 | #define BX_MAX_AHCI_DEVICES 4
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| 96 |
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| 97 | /* An AHCI device starts always at BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES. */
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| 98 | #define VBOX_IS_AHCI_DEVICE(device_id) (device_id >= (BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES))
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| 99 | #define VBOX_GET_AHCI_DEVICE(device_id) (device_id - (BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES))
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| 100 | #else
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| 101 | #define BX_MAX_AHCI_DEVICES 0
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| 102 | #endif
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| 103 |
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| 104 | #define BX_MAX_STORAGE_DEVICES (BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES + BX_MAX_AHCI_DEVICES)
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| 105 |
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| 106 | /* Generic storage device types. These depend on the controller type and
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| 107 | * determine which device access routines should be called.
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| 108 | */
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| 109 | enum dsk_type_enm {
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| 110 | DSK_TYPE_NONE, /* Unknown device. */
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| 111 | DSK_TYPE_UNKNOWN, /* Unknown ATA device. */
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| 112 | DSK_TYPE_ATA, /* ATA disk. */
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| 113 | DSK_TYPE_ATAPI, /* ATAPI device. */
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| 114 | DSK_TYPE_SCSI, /* SCSI disk. */
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| 115 | DSK_TYPE_AHCI, /* SATA disk via AHCI. */
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| 116 | DSKTYP_CNT /* Number of disk types. */
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| 117 | };
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| 118 |
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| 119 | /* Disk device types. */
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| 120 | //@todo: Do we really need these?
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| 121 | #define DSK_DEVICE_NONE 0x00 /* No device attached. */
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| 122 | #define DSK_DEVICE_HD 0xFF /* Device is a hard disk. */
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| 123 | #define DSK_DEVICE_CDROM 0x05 /* Device is a CD-ROM. */
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| 124 |
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| 125 | /* Geometry translation modes. */
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| 126 | enum geo_xlat_enm {
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| 127 | GEO_TRANSLATION_NONE, /* No geometry translation. */
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| 128 | GEO_TRANSLATION_LBA, /* LBA translation. */
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| 129 | GEO_TRANSLATION_LARGE, /* Large CHS translation. */
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| 130 | GEO_TRANSLATION_RECHS
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| 131 | };
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| 132 |
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| 133 | #if 1 //BX_USE_ATADRV
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| 134 |
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| 135 | /* Note: The DPTE and FDPT structures are industry standards and
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| 136 | * may not be modified. The other disk-related structures are
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| 137 | * internal to the BIOS.
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| 138 | */
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| 139 |
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| 140 | /* Translated DPT (Device Parameter Table). */
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| 141 | typedef struct {
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| 142 | uint16_t iobase1;
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| 143 | uint16_t iobase2;
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| 144 | uint8_t prefix;
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| 145 | uint8_t unused;
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| 146 | uint8_t irq;
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| 147 | uint8_t blkcount;
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| 148 | uint8_t dma;
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| 149 | uint8_t pio;
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| 150 | uint16_t options;
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| 151 | uint16_t reserved;
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| 152 | uint8_t revision;
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| 153 | uint8_t checksum;
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| 154 | } dpte_t;
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| 155 |
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| 156 | ct_assert(sizeof(dpte_t) == 16); /* Ensure correct size. */
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| 157 |
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| 158 | #pragma pack(0)
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| 159 |
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| 160 | /* FDPT - Fixed Disk Parameter Table. PC/AT compatible; note
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| 161 | * that this structure is slightly misaligned.
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| 162 | */
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| 163 | typedef struct {
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| 164 | uint16_t lcyl;
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| 165 | uint8_t lhead;
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| 166 | uint8_t sig;
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| 167 | uint8_t spt;
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| 168 | uint32_t resvd1;
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| 169 | uint16_t cyl;
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| 170 | uint8_t head;
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| 171 | uint16_t resvd2;
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| 172 | uint8_t lspt;
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| 173 | uint8_t csum;
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| 174 | } fdpt_t;
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| 175 |
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| 176 | #pragma pack()
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| 177 |
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| 178 | ct_assert(sizeof(fdpt_t) == 16); /* Ensure correct size. */
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| 179 |
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| 180 |
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| 181 | /* C/H/S geometry information. */
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| 182 | typedef struct {
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| 183 | uint16_t heads; /* Number of heads. */
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| 184 | uint16_t cylinders; /* Number of cylinders. */
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| 185 | uint16_t spt; /* Number of sectors per track. */
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| 186 | } chs_t;
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| 187 |
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| 188 | /* IDE/ATA specific device information. */
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| 189 | typedef struct {
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| 190 | uint8_t iface; /* ISA or PCI. */
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| 191 | uint8_t irq; /* IRQ (on the PIC). */
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| 192 | uint16_t iobase1; /* I/O base 1. */
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| 193 | uint16_t iobase2; /* I/O base 2. */
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| 194 | } ata_chan_t;
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| 195 |
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| 196 | #ifdef VBOX_WITH_SCSI
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| 197 |
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| 198 | /* SCSI specific device information. */
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| 199 | typedef struct {
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| 200 | uint16_t hba_seg; /* Segment of HBA driver data block. */
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| 201 | uint8_t idx_hba; /* The HBA driver to use. */
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| 202 | uint8_t target_id; /* Target ID. */
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| 203 | } scsi_dev_t;
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| 204 |
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| 205 | #endif
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| 206 |
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| 207 | #ifdef VBOX_WITH_AHCI
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| 208 |
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| 209 | /* AHCI specific device information. */
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| 210 | typedef struct {
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| 211 | uint8_t port; /* SATA port. */
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| 212 | } ahci_dev_t;
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| 213 |
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| 214 | #endif
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| 215 |
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| 216 | /* Generic disk information. */
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| 217 | typedef struct {
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| 218 | uint8_t type; /* Device type (ATA/ATAPI/SCSI/none/unknown). */
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| 219 | uint8_t device; /* Detected type of attached device (HD/CD/none). */
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| 220 | uint8_t removable; /* Removable device flag. */
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| 221 | uint8_t lock; /* Lock count for removable devices. */
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| 222 | //@todo: ATA specific - move?
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| 223 | uint8_t mode; /* Transfer mode: PIO 16/32 bits - IRQ - ISADMA - PCIDMA. */
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| 224 | uint8_t translation; /* Type of geometry translation. */
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| 225 | uint16_t blksize; /* Disk block size. */
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| 226 | chs_t lchs; /* Logical CHS geometry. */
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| 227 | chs_t pchs; /* Physical CHS geometry. */
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| 228 | uint64_t sectors; /* Total sector count. */
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| 229 | } disk_dev_t;
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| 230 |
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| 231 | /* A structure for passing disk request information around. This structure
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| 232 | * is designed for saving stack space. As BIOS requests cannot be overlapped,
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| 233 | * one such structure is sufficient.
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| 234 | */
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| 235 | typedef struct {
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| 236 | uint64_t lba; /* Starting LBA. */
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| 237 | void __far *buffer; /* Read/write data buffer pointer. */
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| 238 | uint8_t dev_id; /* Device ID; index into devices array. */
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| 239 | uint16_t nsect; /* Number of sectors to be transferred. */
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| 240 | uint16_t sect_sz; /* Size of a sector in bytes. */
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| 241 | uint16_t cylinder; /* Starting cylinder (CHS only). */
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| 242 | uint16_t head; /* Starting head (CHS only). */
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| 243 | uint16_t sector; /* Starting sector (CHS only). */
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| 244 | uint16_t trsfsectors; /* Actual sectors transferred. */
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| 245 | uint32_t trsfbytes; /* Actual bytes transferred. */
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| 246 | } disk_req_t;
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| 247 |
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| 248 | extern uint16_t ahci_cmd_packet(uint16_t device_id, uint8_t cmdlen, char __far *cmdbuf,
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| 249 | uint32_t length, uint8_t inout, char __far *buffer);
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| 250 | extern uint16_t scsi_cmd_packet(uint16_t device, uint8_t cmdlen, char __far *cmdbuf,
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| 251 | uint32_t length, uint8_t inout, char __far *buffer);
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| 252 | extern uint16_t ata_cmd_packet(uint16_t device, uint8_t cmdlen, char __far *cmdbuf,
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| 253 | uint32_t length, uint8_t inout, char __far *buffer);
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| 254 |
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| 255 | extern uint16_t ata_soft_reset(uint16_t device);
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| 256 |
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| 257 | /* All BIOS disk information. Disk-related code in the BIOS should not need
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| 258 | * anything outside of this structure.
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| 259 | */
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| 260 | typedef struct {
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| 261 | disk_req_t drqp; /* Disk request packet. */
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| 262 |
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| 263 | /* Bus-independent disk device information. */
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| 264 | disk_dev_t devices[BX_MAX_STORAGE_DEVICES];
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| 265 |
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| 266 | uint8_t hdcount; /* Total number of BIOS disks. */
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| 267 | /* Map between (BIOS disk ID - 0x80) and ATA/SCSI/AHCI disks. */
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| 268 | uint8_t hdidmap[BX_MAX_STORAGE_DEVICES];
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| 269 |
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| 270 | uint8_t cdcount; /* Number of CD-ROMs. */
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| 271 | /* Map between (BIOS CD-ROM ID - 0xE0) and ATA/SCSI/AHCI devices. */
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| 272 | uint8_t cdidmap[BX_MAX_STORAGE_DEVICES];
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| 273 |
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| 274 | /* ATA bus-specific device information. */
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| 275 | ata_chan_t channels[BX_MAX_ATA_INTERFACES];
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| 276 |
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| 277 | #ifdef VBOX_WITH_SCSI
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| 278 | /* SCSI bus-specific device information. */
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| 279 | scsi_dev_t scsidev[BX_MAX_SCSI_DEVICES];
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| 280 | uint8_t scsi_devcount; /* Number of SCSI devices. */
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| 281 | #endif
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| 282 |
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| 283 | #ifdef VBOX_WITH_AHCI
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| 284 | /* SATA (AHCI) bus-specific device information. */
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| 285 | ahci_dev_t ahcidev[BX_MAX_AHCI_DEVICES];
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| 286 | uint8_t ahci_devcnt; /* Number of SATA devices. */
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| 287 | uint16_t ahci_seg; /* Segment of AHCI data block. */
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| 288 | #endif
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| 289 |
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| 290 | dpte_t dpte; /* Buffer for building a DPTE. */
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| 291 | } bio_dsk_t;
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| 292 |
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| 293 | #if BX_ELTORITO_BOOT
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| 294 | /* El Torito device emulation state. */
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| 295 | typedef struct {
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| 296 | uint8_t active;
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| 297 | uint8_t media;
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| 298 | uint8_t emulated_drive;
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| 299 | uint8_t controller_index;
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| 300 | uint16_t device_spec;
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| 301 | uint16_t buffer_segment;
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| 302 | uint32_t ilba;
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| 303 | uint16_t load_segment;
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| 304 | uint16_t sector_count;
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| 305 | chs_t vdevice; /* Virtual device geometry. */
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| 306 | uint8_t __far *ptr_unaligned; /* Bounce buffer for sector unaligned reads. */
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| 307 | } cdemu_t;
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| 308 | #endif
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| 309 |
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| 310 | // for access to EBDA area
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| 311 | // The EBDA structure should conform to
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| 312 | // http://www.frontiernet.net/~fys/rombios.htm document
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| 313 | // I made the ata and cdemu structs begin at 0x121 in the EBDA seg
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| 314 | /* MS-DOS KEYB.COM may overwrite the word at offset 0x117 in the EBDA
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| 315 | * which contains the keyboard ID for PS/2 BIOSes.
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| 316 | */
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| 317 | typedef struct {
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| 318 | uint8_t filler1[0x3D];
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| 319 |
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| 320 | fdpt_t fdpt0; /* FDPTs for the first two ATA disks. */
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| 321 | fdpt_t fdpt1;
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| 322 |
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| 323 | bio_dsk_t bdisk; /* Disk driver data (ATA/SCSI/AHCI). */
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| 324 |
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| 325 | #if BX_ELTORITO_BOOT
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| 326 | cdemu_t cdemu; /* El Torito floppy/HD emulation data. */
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| 327 | #endif
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| 328 |
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| 329 | unsigned char uForceBootDrive;
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| 330 | unsigned char uForceBootDevice;
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| 331 | } ebda_data_t;
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| 332 |
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| 333 | ct_assert(sizeof(ebda_data_t) < 0x380); /* Must be under 1K in size. */
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| 334 |
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| 335 | // the last 16 bytes of the EBDA segment are used for the MPS floating
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| 336 | // pointer structure (though only if an I/O APIC is present)
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| 337 |
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| 338 | #define EbdaData ((ebda_data_t *) 0)
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| 339 |
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| 340 | // for access to the int13ext structure
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| 341 | typedef struct {
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| 342 | uint8_t size;
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| 343 | uint8_t reserved;
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| 344 | uint16_t count;
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| 345 | uint16_t offset;
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| 346 | uint16_t segment;
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| 347 | uint32_t lba1;
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| 348 | uint32_t lba2;
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| 349 | } int13ext_t;
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| 350 |
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| 351 | /* Disk Physical Table structure */
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| 352 | typedef struct {
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| 353 | uint16_t size;
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| 354 | uint16_t infos;
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| 355 | uint32_t cylinders;
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| 356 | uint32_t heads;
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| 357 | uint32_t spt;
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| 358 | uint32_t sector_count1;
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| 359 | uint32_t sector_count2;
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| 360 | uint16_t blksize;
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| 361 | uint16_t dpte_offset;
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| 362 | uint16_t dpte_segment;
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| 363 | uint16_t key;
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| 364 | uint8_t dpi_length;
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| 365 | uint8_t reserved1;
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| 366 | uint16_t reserved2;
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| 367 | uint8_t host_bus[4];
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| 368 | uint8_t iface_type[8];
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| 369 | uint8_t iface_path[8];
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| 370 | uint8_t device_path[8];
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| 371 | uint8_t reserved3;
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| 372 | uint8_t checksum;
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| 373 | } dpt_t;
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| 374 |
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| 375 | /* Note: Using fastcall reduces stack usage a little. */
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| 376 | int __fastcall ata_read_sectors(bio_dsk_t __far *bios_dsk);
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| 377 | int __fastcall ata_write_sectors(bio_dsk_t __far *bios_dsk);
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| 378 |
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| 379 | int __fastcall scsi_read_sectors(bio_dsk_t __far *bios_dsk);
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| 380 | int __fastcall scsi_write_sectors(bio_dsk_t __far *bios_dsk);
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| 381 |
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| 382 | int __fastcall ahci_read_sectors(bio_dsk_t __far *bios_dsk);
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| 383 | int __fastcall ahci_write_sectors(bio_dsk_t __far *bios_dsk);
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| 384 |
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| 385 | extern void set_geom_lba(chs_t __far *lgeo, uint64_t nsectors);
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| 386 | extern int edd_fill_dpt(dpt_t __far *dpt, bio_dsk_t __far *bios_dsk, uint8_t device);
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| 387 |
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| 388 | // @todo: put this elsewhere (and change/eliminate?)
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| 389 | #define SET_DISK_RET_STATUS(status) write_byte(0x0040, 0x0074, status)
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| 390 |
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| 391 | #endif
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| 392 | #endif /* !VBOX_INCLUDED_SRC_PC_BIOS_ebda_h */
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| 393 |
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