diff options
Diffstat (limited to 'src/VBox/Devices/PC/BIOS/ebda.h')
| -rw-r--r-- | src/VBox/Devices/PC/BIOS/ebda.h | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/src/VBox/Devices/PC/BIOS/ebda.h b/src/VBox/Devices/PC/BIOS/ebda.h new file mode 100644 index 00000000..3e4eecec --- /dev/null +++ b/src/VBox/Devices/PC/BIOS/ebda.h @@ -0,0 +1,405 @@ +/* $Id: ebda.h $ */ +/** @file + * PC BIOS - EBDA (Extended BIOS Data Area) Definition + */ + +/* + * Copyright (C) 2006-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + * -------------------------------------------------------------------- + * + * This code is based on: + * + * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment + * + * Copyright (C) 2002 MandrakeSoft S.A. + * + * MandrakeSoft S.A. + * 43, rue d'Aboukir + * 75002 Paris - France + * http://www.linux-mandrake.com/ + * http://www.mandrakesoft.com/ + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +/* + * Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice + * other than GPL or LGPL is available it will apply instead, Oracle elects to use only + * the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where + * a choice of LGPL license versions is made available with the language indicating + * that LGPLv2 or any later version may be used, or where a choice of which version + * of the LGPL is applied is otherwise unspecified. + */ + +#ifndef VBOX_INCLUDED_SRC_PC_BIOS_ebda_h +#define VBOX_INCLUDED_SRC_PC_BIOS_ebda_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <stdint.h> + +/* Must be defined here (EBDA structures depend on these). */ +#define BX_MAX_ATA_INTERFACES 4 +#define BX_MAX_ATA_DEVICES (BX_MAX_ATA_INTERFACES*2) + +#define BX_USE_ATADRV 1 +#define BX_ELTORITO_BOOT 1 + +#ifdef VBOX_WITH_SCSI + /* Enough for now */ + #define BX_MAX_SCSI_DEVICES 4 + /* A SCSI device starts always at BX_MAX_ATA_DEVICES. */ + #define VBOX_IS_SCSI_DEVICE(device_id) (device_id >= BX_MAX_ATA_DEVICES) + #define VBOX_GET_SCSI_DEVICE(device_id) (device_id - BX_MAX_ATA_DEVICES) +#else + #define BX_MAX_SCSI_DEVICES 0 +#endif + +#ifdef VBOX_WITH_AHCI + /* Four should be enough for now */ + #define BX_MAX_AHCI_DEVICES 4 + + /* An AHCI device starts always at BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES. */ + #define VBOX_IS_AHCI_DEVICE(device_id) (device_id >= (BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES)) + #define VBOX_GET_AHCI_DEVICE(device_id) (device_id - (BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES)) +#else + #define BX_MAX_AHCI_DEVICES 0 +#endif + +#ifdef VBOX_WITH_VIRTIO_SCSI + /* Four should be enough for now */ + #define BX_MAX_VIRTIO_SCSI_DEVICES 4 + + /* An AHCI device starts always at BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES. */ + #define VBOX_IS_VIRTIO_SCSI_DEVICE(device_id) (device_id >= (BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES + BX_MAX_AHCI_DEVICES)) + #define VBOX_GET_VIRTIO_SCSI_DEVICE(device_id) (device_id - (BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES + BX_MAX_AHCI_DEVICES)) +#else + #define BX_MAX_VIRTIO_SCSI_DEVICES 0 +#endif + +#define BX_MAX_STORAGE_DEVICES (BX_MAX_ATA_DEVICES + BX_MAX_SCSI_DEVICES + BX_MAX_AHCI_DEVICES + BX_MAX_VIRTIO_SCSI_DEVICES) + +/* Generic storage device types. These depend on the controller type and + * determine which device access routines should be called. + */ +enum dsk_type_enm { + DSK_TYPE_NONE, /* Unknown device. */ + DSK_TYPE_UNKNOWN, /* Unknown ATA device. */ + DSK_TYPE_ATA, /* ATA disk. */ + DSK_TYPE_ATAPI, /* ATAPI device. */ + DSK_TYPE_SCSI, /* SCSI disk. */ + DSK_TYPE_AHCI, /* SATA disk via AHCI. */ + DSKTYP_CNT /* Number of disk types. */ +}; + +/* Disk device types. */ +//@todo: Do we really need these? +#define DSK_DEVICE_NONE 0x00 /* No device attached. */ +#define DSK_DEVICE_HD 0xFF /* Device is a hard disk. */ +#define DSK_DEVICE_CDROM 0x05 /* Device is a CD-ROM. */ + +/* Geometry translation modes. */ +enum geo_xlat_enm { + GEO_TRANSLATION_NONE, /* No geometry translation. */ + GEO_TRANSLATION_LBA, /* LBA translation. */ + GEO_TRANSLATION_LARGE, /* Large CHS translation. */ + GEO_TRANSLATION_RECHS +}; + +#if 1 //BX_USE_ATADRV + +/* Note: The DPTE and FDPT structures are industry standards and + * may not be modified. The other disk-related structures are + * internal to the BIOS. + */ + +/* Translated DPT (Device Parameter Table). */ +typedef struct { + uint16_t iobase1; + uint16_t iobase2; + uint8_t prefix; + uint8_t unused; + uint8_t irq; + uint8_t blkcount; + uint8_t dma; + uint8_t pio; + uint16_t options; + uint16_t reserved; + uint8_t revision; + uint8_t checksum; +} dpte_t; + +ct_assert(sizeof(dpte_t) == 16); /* Ensure correct size. */ + +#pragma pack(0) + +/* FDPT - Fixed Disk Parameter Table. PC/AT compatible; note + * that this structure is slightly misaligned. + */ +typedef struct { + uint16_t lcyl; + uint8_t lhead; + uint8_t sig; + uint8_t spt; + uint32_t resvd1; + uint16_t cyl; + uint8_t head; + uint16_t resvd2; + uint8_t lspt; + uint8_t csum; +} fdpt_t; + +#pragma pack() + +ct_assert(sizeof(fdpt_t) == 16); /* Ensure correct size. */ + + +/* C/H/S geometry information. */ +typedef struct { + uint16_t heads; /* Number of heads. */ + uint16_t cylinders; /* Number of cylinders. */ + uint16_t spt; /* Number of sectors per track. */ +} chs_t; + +/* IDE/ATA specific device information. */ +typedef struct { + uint8_t iface; /* ISA or PCI. */ + uint8_t irq; /* IRQ (on the PIC). */ + uint16_t iobase1; /* I/O base 1. */ + uint16_t iobase2; /* I/O base 2. */ +} ata_chan_t; + +#ifdef VBOX_WITH_SCSI + +/* SCSI specific device information. */ +typedef struct { + uint16_t hba_seg; /* Segment of HBA driver data block. */ + uint8_t idx_hba; /* The HBA driver to use. */ + uint8_t target_id; /* Target ID. */ +} scsi_dev_t; + +#endif + +#ifdef VBOX_WITH_AHCI + +/* AHCI specific device information. */ +typedef struct { + uint8_t port; /* SATA port. */ +} ahci_dev_t; + +#endif + +/* Generic disk information. */ +typedef struct { + uint8_t type; /* Device type (ATA/ATAPI/SCSI/none/unknown). */ + uint8_t device; /* Detected type of attached device (HD/CD/none). */ + uint8_t removable; /* Removable device flag. */ + uint8_t lock; /* Lock count for removable devices. */ + //@todo: ATA specific - move? + uint8_t mode; /* Transfer mode: PIO 16/32 bits - IRQ - ISADMA - PCIDMA. */ + uint8_t translation; /* Type of geometry translation. */ + uint16_t blksize; /* Disk block size. */ + chs_t lchs; /* Logical CHS geometry. */ + chs_t pchs; /* Physical CHS geometry. */ + uint64_t sectors; /* Total sector count. */ +} disk_dev_t; + +/* A structure for passing disk request information around. This structure + * is designed for saving stack space. As BIOS requests cannot be overlapped, + * one such structure is sufficient. + */ +typedef struct { + uint64_t lba; /* Starting LBA. */ + void __far *buffer; /* Read/write data buffer pointer. */ + uint8_t dev_id; /* Device ID; index into devices array. */ + uint16_t nsect; /* Number of sectors to be transferred. */ + uint16_t sect_sz; /* Size of a sector in bytes. */ + uint16_t cylinder; /* Starting cylinder (CHS only). */ + uint16_t head; /* Starting head (CHS only). */ + uint16_t sector; /* Starting sector (CHS only). */ + uint16_t trsfsectors; /* Actual sectors transferred. */ + uint32_t trsfbytes; /* Actual bytes transferred. */ +} disk_req_t; + +extern uint16_t ahci_cmd_packet(uint16_t device_id, uint8_t cmdlen, char __far *cmdbuf, + uint32_t length, uint8_t inout, char __far *buffer); +extern uint16_t scsi_cmd_packet(uint16_t device, uint8_t cmdlen, char __far *cmdbuf, + uint32_t length, uint8_t inout, char __far *buffer); +extern uint16_t ata_cmd_packet(uint16_t device, uint8_t cmdlen, char __far *cmdbuf, + uint32_t length, uint8_t inout, char __far *buffer); + +extern uint16_t ata_soft_reset(uint16_t device); + +/* All BIOS disk information. Disk-related code in the BIOS should not need + * anything outside of this structure. + */ +typedef struct { + disk_req_t drqp; /* Disk request packet. */ + + /* Bus-independent disk device information. */ + disk_dev_t devices[BX_MAX_STORAGE_DEVICES]; + + uint8_t hdcount; /* Total number of BIOS disks. */ + /* Map between (BIOS disk ID - 0x80) and ATA/SCSI/AHCI disks. */ + uint8_t hdidmap[BX_MAX_STORAGE_DEVICES]; + + uint8_t cdcount; /* Number of CD-ROMs. */ + /* Map between (BIOS CD-ROM ID - 0xE0) and ATA/SCSI/AHCI devices. */ + uint8_t cdidmap[BX_MAX_STORAGE_DEVICES]; + + /* ATA bus-specific device information. */ + ata_chan_t channels[BX_MAX_ATA_INTERFACES]; + +#ifdef VBOX_WITH_SCSI + /* SCSI bus-specific device information. */ + scsi_dev_t scsidev[BX_MAX_SCSI_DEVICES]; + uint8_t scsi_devcount; /* Number of SCSI devices. */ +#endif + +#ifdef VBOX_WITH_AHCI + /* SATA (AHCI) bus-specific device information. */ + ahci_dev_t ahcidev[BX_MAX_AHCI_DEVICES]; + uint8_t ahci_devcnt; /* Number of SATA devices. */ + uint16_t ahci_seg; /* Segment of AHCI data block. */ +#endif + + dpte_t dpte; /* Buffer for building a DPTE. */ +} bio_dsk_t; + +#if BX_ELTORITO_BOOT +/* El Torito device emulation state. */ +typedef struct { + uint8_t active; + uint8_t media; + uint8_t emulated_drive; + uint8_t controller_index; + uint16_t device_spec; + uint16_t buffer_segment; + uint32_t ilba; + uint16_t load_segment; + uint16_t sector_count; + chs_t vdevice; /* Virtual device geometry. */ + uint8_t __far *ptr_unaligned; /* Bounce buffer for sector unaligned reads. */ +} cdemu_t; +#endif + +// for access to EBDA area +// The EBDA structure should conform to +// http://www.frontiernet.net/~fys/rombios.htm document +// I made the ata and cdemu structs begin at 0x121 in the EBDA seg +/* MS-DOS KEYB.COM may overwrite the word at offset 0x117 in the EBDA + * which contains the keyboard ID for PS/2 BIOSes. + */ +typedef struct { + uint8_t filler1[0x3D]; + + fdpt_t fdpt0; /* FDPTs for the first two ATA disks. */ + fdpt_t fdpt1; + +#ifndef VBOX_WITH_VIRTIO_SCSI /** @todo For development only, need to find a real solution to voercome the 1KB limit. */ + uint8_t filler2[0xC4]; +#endif + + bio_dsk_t bdisk; /* Disk driver data (ATA/SCSI/AHCI). */ + +#if BX_ELTORITO_BOOT + cdemu_t cdemu; /* El Torito floppy/HD emulation data. */ +#endif + + unsigned char uForceBootDrive; + unsigned char uForceBootDevice; +} ebda_data_t; + +ct_assert(sizeof(ebda_data_t) < 0x380); /* Must be under 1K in size. */ + +// the last 16 bytes of the EBDA segment are used for the MPS floating +// pointer structure (though only if an I/O APIC is present) + +#define EbdaData ((ebda_data_t *) 0) + +// for access to the int13ext structure +typedef struct { + uint8_t size; + uint8_t reserved; + uint16_t count; + uint16_t offset; + uint16_t segment; + uint32_t lba1; + uint32_t lba2; +} int13ext_t; + +/* Disk Physical Table structure */ +typedef struct { + uint16_t size; + uint16_t infos; + uint32_t cylinders; + uint32_t heads; + uint32_t spt; + uint32_t sector_count1; + uint32_t sector_count2; + uint16_t blksize; + uint16_t dpte_offset; + uint16_t dpte_segment; + uint16_t key; + uint8_t dpi_length; + uint8_t reserved1; + uint16_t reserved2; + uint8_t host_bus[4]; + uint8_t iface_type[8]; + uint8_t iface_path[8]; + uint8_t device_path[8]; + uint8_t reserved3; + uint8_t checksum; +} dpt_t; + +/* Note: Using fastcall reduces stack usage a little. */ +int __fastcall ata_read_sectors(bio_dsk_t __far *bios_dsk); +int __fastcall ata_write_sectors(bio_dsk_t __far *bios_dsk); + +int __fastcall scsi_read_sectors(bio_dsk_t __far *bios_dsk); +int __fastcall scsi_write_sectors(bio_dsk_t __far *bios_dsk); + +int __fastcall ahci_read_sectors(bio_dsk_t __far *bios_dsk); +int __fastcall ahci_write_sectors(bio_dsk_t __far *bios_dsk); + +extern void set_geom_lba(chs_t __far *lgeo, uint64_t nsectors); +extern int edd_fill_dpt(dpt_t __far *dpt, bio_dsk_t __far *bios_dsk, uint8_t device); + +// @todo: put this elsewhere (and change/eliminate?) +#define SET_DISK_RET_STATUS(status) write_byte(0x0040, 0x0074, status) + +#endif +#endif /* !VBOX_INCLUDED_SRC_PC_BIOS_ebda_h */ + |