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1587 lines
45 KiB
C
1587 lines
45 KiB
C
/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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* Copyright (C) 2020 longpanda <admin@ventoy.net>.
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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 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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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <byteswap.h>
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#include <errno.h>
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#include <assert.h>
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#include <ipxe/blockdev.h>
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#include <ipxe/io.h>
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#include <ipxe/acpi.h>
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#include <ipxe/sanboot.h>
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#include <ipxe/device.h>
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#include <ipxe/pci.h>
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#include <ipxe/timer.h>
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#include <ipxe/eltorito.h>
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#include <ipxe/umalloc.h>
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#include <ipxe/acpi.h>
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#include <ipxe/ibft.h>
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#include <realmode.h>
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#include <bios.h>
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#include <biosint.h>
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#include <bootsector.h>
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#include <int13.h>
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#include <ventoy.h>
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#include "ventoy_int13.h"
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static unsigned int g_drive_map1 = 0;
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static unsigned int g_drive_map2 = 0;
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/** @file
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*
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* INT 13 emulation
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*
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* This module provides a mechanism for exporting block devices via
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* the BIOS INT 13 disk interrupt interface.
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*
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*/
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/** INT 13 SAN device private data */
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struct int13_data {
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/** BIOS natural drive number (0x00-0xff)
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*
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* This is the drive number that would have been assigned by
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* 'naturally' appending the drive to the end of the BIOS
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* drive list.
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*
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* If the emulated drive replaces a preexisting drive, this is
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* the drive number that the preexisting drive gets remapped
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* to.
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*/
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unsigned int natural_drive;
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/** Number of cylinders
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*
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* The cylinder number field in an INT 13 call is ten bits
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* wide, giving a maximum of 1024 cylinders. Conventionally,
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* when the 7.8GB limit of a CHS address is exceeded, it is
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* the number of cylinders that is increased beyond the
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* addressable limit.
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*/
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unsigned int cylinders;
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/** Number of heads
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*
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* The head number field in an INT 13 call is eight bits wide,
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* giving a maximum of 256 heads. However, apparently all
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* versions of MS-DOS up to and including Win95 fail with 256
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* heads, so the maximum encountered in practice is 255.
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*/
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unsigned int heads;
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/** Number of sectors per track
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*
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* The sector number field in an INT 13 call is six bits wide,
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* giving a maximum of 63 sectors, since sector numbering
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* (unlike head and cylinder numbering) starts at 1, not 0.
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*/
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unsigned int sectors_per_track;
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/** Address of El Torito boot catalog (if any) */
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unsigned int boot_catalog;
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/** Status of last operation */
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int last_status;
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};
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/** Vector for chaining to other INT 13 handlers */
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static struct segoff __text16 ( int13_vector );
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#define int13_vector __use_text16 ( int13_vector )
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/** Assembly wrapper */
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extern void int13_wrapper ( void );
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/** Dummy floppy disk parameter table */
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static struct int13_fdd_parameters __data16 ( int13_fdd_params ) = {
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/* 512 bytes per sector */
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.bytes_per_sector = 0x02,
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/* Highest sectors per track that we ever return */
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.sectors_per_track = 48,
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};
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#define int13_fdd_params __use_data16 ( int13_fdd_params )
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/**
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* Equipment word
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*
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* This is a cached copy of the BIOS Data Area equipment word at
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* 40:10.
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*/
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static uint16_t equipment_word;
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/**
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* Number of BIOS floppy disk drives
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*
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* This is derived from the equipment word. It is held in .text16 to
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* allow for easy access by the INT 13,08 wrapper.
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*/
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static uint8_t __text16 ( num_fdds );
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#define num_fdds __use_text16 ( num_fdds )
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/**
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* Number of BIOS hard disk drives
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*
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* This is a cached copy of the BIOS Data Area number of hard disk
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* drives at 40:75. It is held in .text16 to allow for easy access by
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* the INT 13,08 wrapper.
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*/
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static uint8_t __text16 ( num_drives );
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#define num_drives __use_text16 ( num_drives )
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static struct san_device *g_sandev;
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/**
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* Calculate SAN device capacity (limited to 32 bits)
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*
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* @v sandev SAN device
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* @ret blocks Number of blocks
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*/
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static inline uint32_t int13_capacity32 ( struct san_device *sandev ) {
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uint64_t capacity = sandev_capacity ( sandev );
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return ( ( capacity <= 0xffffffffUL ) ? capacity : 0xffffffff );
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}
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/**
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* Test if SAN device is a floppy disk drive
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*
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* @v sandev SAN device
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* @ret is_fdd SAN device is a floppy disk drive
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*/
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static inline int int13_is_fdd ( struct san_device *sandev ) {
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(void)sandev;
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return 0;
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}
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#if 0
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/**
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* Guess INT 13 hard disk drive geometry
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*
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* @v sandev SAN device
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* @v scratch Scratch area for single-sector reads
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* @ret heads Guessed number of heads
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* @ret sectors Guessed number of sectors per track
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* @ret rc Return status code
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*
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* Guesses the drive geometry by inspecting the partition table.
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*/
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static int int13_guess_geometry_hdd ( struct san_device *sandev, void *scratch,
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unsigned int *heads,
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unsigned int *sectors ) {
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struct master_boot_record *mbr = scratch;
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struct partition_table_entry *partition;
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unsigned int i;
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unsigned int start_cylinder;
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unsigned int start_head;
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unsigned int start_sector;
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unsigned int end_head;
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unsigned int end_sector;
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int rc;
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/* Read partition table */
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if ( ( rc = sandev_read ( sandev, 0, 1, virt_to_user ( mbr ) ) ) != 0 ) {
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DBGC ( sandev, "INT13 drive %02x could not read "
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"partition table to guess geometry: %s\n",
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sandev->drive, strerror ( rc ) );
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return rc;
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}
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DBGC2 ( sandev, "INT13 drive %02x has MBR:\n", sandev->drive );
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DBGC2_HDA ( sandev, 0, mbr, sizeof ( *mbr ) );
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DBGC ( sandev, "INT13 drive %02x has signature %08x\n",
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sandev->drive, mbr->signature );
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/* Scan through partition table and modify guesses for
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* heads and sectors_per_track if we find any used
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* partitions.
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*/
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*heads = 0;
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*sectors = 0;
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for ( i = 0 ; i < 4 ; i++ ) {
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/* Skip empty partitions */
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partition = &mbr->partitions[i];
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if ( ! partition->type )
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continue;
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/* If partition starts on cylinder 0 then we can
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* unambiguously determine the number of sectors.
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*/
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start_cylinder = PART_CYLINDER ( partition->chs_start );
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start_head = PART_HEAD ( partition->chs_start );
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start_sector = PART_SECTOR ( partition->chs_start );
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if ( ( start_cylinder == 0 ) && ( start_head != 0 ) ) {
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*sectors = ( ( partition->start + 1 - start_sector ) /
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start_head );
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DBGC ( sandev, "INT13 drive %02x guessing C/H/S "
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"xx/xx/%d based on partition %d\n",
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sandev->drive, *sectors, ( i + 1 ) );
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}
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/* If partition ends on a higher head or sector number
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* than our current guess, then increase the guess.
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*/
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end_head = PART_HEAD ( partition->chs_end );
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end_sector = PART_SECTOR ( partition->chs_end );
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if ( ( end_head + 1 ) > *heads ) {
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*heads = ( end_head + 1 );
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DBGC ( sandev, "INT13 drive %02x guessing C/H/S "
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"xx/%d/xx based on partition %d\n",
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sandev->drive, *heads, ( i + 1 ) );
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}
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if ( end_sector > *sectors ) {
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*sectors = end_sector;
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DBGC ( sandev, "INT13 drive %02x guessing C/H/S "
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"xx/xx/%d based on partition %d\n",
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sandev->drive, *sectors, ( i + 1 ) );
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}
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}
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/* Default guess is xx/255/63 */
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if ( ! *heads )
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*heads = 255;
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if ( ! *sectors )
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*sectors = 63;
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return 0;
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}
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/** Recognised floppy disk geometries */
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static const struct int13_fdd_geometry int13_fdd_geometries[] = {
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INT13_FDD_GEOMETRY ( 40, 1, 8 ),
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INT13_FDD_GEOMETRY ( 40, 1, 9 ),
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INT13_FDD_GEOMETRY ( 40, 2, 8 ),
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INT13_FDD_GEOMETRY ( 40, 1, 9 ),
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INT13_FDD_GEOMETRY ( 80, 2, 8 ),
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INT13_FDD_GEOMETRY ( 80, 2, 9 ),
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INT13_FDD_GEOMETRY ( 80, 2, 15 ),
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INT13_FDD_GEOMETRY ( 80, 2, 18 ),
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INT13_FDD_GEOMETRY ( 80, 2, 20 ),
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INT13_FDD_GEOMETRY ( 80, 2, 21 ),
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INT13_FDD_GEOMETRY ( 82, 2, 21 ),
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INT13_FDD_GEOMETRY ( 83, 2, 21 ),
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INT13_FDD_GEOMETRY ( 80, 2, 22 ),
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INT13_FDD_GEOMETRY ( 80, 2, 23 ),
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INT13_FDD_GEOMETRY ( 80, 2, 24 ),
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INT13_FDD_GEOMETRY ( 80, 2, 36 ),
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INT13_FDD_GEOMETRY ( 80, 2, 39 ),
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INT13_FDD_GEOMETRY ( 80, 2, 40 ),
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INT13_FDD_GEOMETRY ( 80, 2, 44 ),
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INT13_FDD_GEOMETRY ( 80, 2, 48 ),
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};
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/**
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* Guess INT 13 floppy disk drive geometry
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*
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* @v sandev SAN device
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* @ret heads Guessed number of heads
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* @ret sectors Guessed number of sectors per track
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* @ret rc Return status code
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*
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* Guesses the drive geometry by inspecting the disk size.
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*/
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static int int13_guess_geometry_fdd ( struct san_device *sandev,
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unsigned int *heads,
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unsigned int *sectors ) {
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unsigned int blocks = sandev_capacity ( sandev );
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const struct int13_fdd_geometry *geometry;
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unsigned int cylinders;
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unsigned int i;
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/* Look for a match against a known geometry */
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for ( i = 0 ; i < ( sizeof ( int13_fdd_geometries ) /
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sizeof ( int13_fdd_geometries[0] ) ) ; i++ ) {
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geometry = &int13_fdd_geometries[i];
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cylinders = INT13_FDD_CYLINDERS ( geometry );
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*heads = INT13_FDD_HEADS ( geometry );
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*sectors = INT13_FDD_SECTORS ( geometry );
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if ( ( cylinders * (*heads) * (*sectors) ) == blocks ) {
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DBGC ( sandev, "INT13 drive %02x guessing C/H/S "
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"%d/%d/%d based on size %dK\n", sandev->drive,
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cylinders, *heads, *sectors, ( blocks / 2 ) );
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return 0;
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}
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}
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/* Otherwise, assume a partial disk image in the most common
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* format (1440K, 80/2/18).
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*/
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*heads = 2;
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*sectors = 18;
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DBGC ( sandev, "INT13 drive %02x guessing C/H/S xx/%d/%d based on size "
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"%dK\n", sandev->drive, *heads, *sectors, ( blocks / 2 ) );
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return 0;
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}
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/**
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* Guess INT 13 drive geometry
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*
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* @v sandev SAN device
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* @v scratch Scratch area for single-sector reads
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* @ret rc Return status code
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*/
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static int int13_guess_geometry ( struct san_device *sandev, void *scratch ) {
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struct int13_data *int13 = sandev->priv;
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unsigned int guessed_heads;
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unsigned int guessed_sectors;
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unsigned int blocks;
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unsigned int blocks_per_cyl;
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int rc;
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/* Guess geometry according to drive type */
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if ( int13_is_fdd ( sandev ) ) {
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if ( ( rc = int13_guess_geometry_fdd ( sandev, &guessed_heads,
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&guessed_sectors )) != 0)
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return rc;
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} else {
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if ( ( rc = int13_guess_geometry_hdd ( sandev, scratch,
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&guessed_heads,
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&guessed_sectors )) != 0)
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return rc;
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}
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/* Apply guesses if no geometry already specified */
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if ( ! int13->heads )
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int13->heads = guessed_heads;
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if ( ! int13->sectors_per_track )
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int13->sectors_per_track = guessed_sectors;
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if ( ! int13->cylinders ) {
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/* Avoid attempting a 64-bit divide on a 32-bit system */
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blocks = int13_capacity32 ( sandev );
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blocks_per_cyl = ( int13->heads * int13->sectors_per_track );
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assert ( blocks_per_cyl != 0 );
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int13->cylinders = ( blocks / blocks_per_cyl );
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if ( int13->cylinders > 1024 )
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int13->cylinders = 1024;
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}
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return 0;
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}
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#endif /* #if 0 */
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/**
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* Update BIOS drive count
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*/
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void int13_sync_num_drives ( void ) {
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struct san_device *sandev;
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struct int13_data *int13;
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uint8_t *counter;
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uint8_t max_drive;
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uint8_t required;
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/* Get current drive counts */
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get_real ( equipment_word, BDA_SEG, BDA_EQUIPMENT_WORD );
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get_real ( num_drives, BDA_SEG, BDA_NUM_DRIVES );
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num_fdds = ( ( equipment_word & 0x0001 ) ?
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( ( ( equipment_word >> 6 ) & 0x3 ) + 1 ) : 0 );
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/* Ensure count is large enough to cover all of our SAN devices */
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for_each_sandev ( sandev ) {
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int13 = sandev->priv;
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counter = ( int13_is_fdd ( sandev ) ? &num_fdds : &num_drives );
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max_drive = sandev->drive;
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if ( max_drive < int13->natural_drive )
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max_drive = int13->natural_drive;
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required = ( ( max_drive & 0x7f ) + 1 );
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if ( *counter < required ) {
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*counter = required;
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DBGC ( sandev, "INT13 drive %02x added to drive count: "
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"%d HDDs, %d FDDs\n",
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sandev->drive, num_drives, num_fdds );
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}
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}
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/* Update current drive count */
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equipment_word &= ~( ( 0x3 << 6 ) | 0x0001 );
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if ( num_fdds ) {
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equipment_word |= ( 0x0001 |
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( ( ( num_fdds - 1 ) & 0x3 ) << 6 ) );
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}
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put_real ( equipment_word, BDA_SEG, BDA_EQUIPMENT_WORD );
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put_real ( num_drives, BDA_SEG, BDA_NUM_DRIVES );
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}
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|
|
/**
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* Check number of drives
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*/
|
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void int13_check_num_drives ( void ) {
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uint16_t check_equipment_word;
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uint8_t check_num_drives;
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get_real ( check_equipment_word, BDA_SEG, BDA_EQUIPMENT_WORD );
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get_real ( check_num_drives, BDA_SEG, BDA_NUM_DRIVES );
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if ( ( check_equipment_word != equipment_word ) ||
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( check_num_drives != num_drives ) ) {
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int13_sync_num_drives();
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}
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}
|
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|
|
/**
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|
* INT 13, 00 - Reset disk system
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|
*
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* @v sandev SAN device
|
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* @ret status Status code
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|
*/
|
|
static int int13_reset ( struct san_device *sandev,
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struct i386_all_regs *ix86 __unused ) {
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int rc;
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|
DBGC2 ( sandev, "Reset drive\n" );
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|
/* Reset SAN device */
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if ( ( rc = sandev_reset ( sandev ) ) != 0 )
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return -INT13_STATUS_RESET_FAILED;
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|
|
return 0;
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}
|
|
|
|
/**
|
|
* INT 13, 01 - Get status of last operation
|
|
*
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* @v sandev SAN device
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* @ret status Status code
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|
*/
|
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static int int13_get_last_status ( struct san_device *sandev,
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struct i386_all_regs *ix86 __unused ) {
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struct int13_data *int13 = sandev->priv;
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DBGC2 ( sandev, "Get status of last operation\n" );
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return int13->last_status;
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}
|
|
|
|
/**
|
|
* Read / write sectors
|
|
*
|
|
* @v sandev SAN device
|
|
* @v al Number of sectors to read or write (must be nonzero)
|
|
* @v ch Low bits of cylinder number
|
|
* @v cl (bits 7:6) High bits of cylinder number
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|
* @v cl (bits 5:0) Sector number
|
|
* @v dh Head number
|
|
* @v es:bx Data buffer
|
|
* @v sandev_rw SAN device read/write method
|
|
* @ret status Status code
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|
* @ret al Number of sectors read or written
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|
*/
|
|
static int int13_rw_sectors ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86,
|
|
int ( * sandev_rw ) ( struct san_device *sandev,
|
|
uint64_t lba,
|
|
unsigned int count,
|
|
userptr_t buffer ) ) {
|
|
struct int13_data *int13 = sandev->priv;
|
|
unsigned int cylinder, head, sector;
|
|
unsigned long lba;
|
|
unsigned int count;
|
|
userptr_t buffer;
|
|
int rc;
|
|
|
|
/* Validate blocksize */
|
|
if ( sandev_blksize ( sandev ) != INT13_BLKSIZE ) {
|
|
DBGC ( sandev, "\nINT 13 drive %02x invalid blocksize (%zd) "
|
|
"for non-extended read/write\n",
|
|
sandev->drive, sandev_blksize ( sandev ) );
|
|
return -INT13_STATUS_INVALID;
|
|
}
|
|
|
|
/* Calculate parameters */
|
|
cylinder = ( ( ( ix86->regs.cl & 0xc0 ) << 2 ) | ix86->regs.ch );
|
|
head = ix86->regs.dh;
|
|
sector = ( ix86->regs.cl & 0x3f );
|
|
if ( ( cylinder >= int13->cylinders ) ||
|
|
( head >= int13->heads ) ||
|
|
( sector < 1 ) || ( sector > int13->sectors_per_track ) ) {
|
|
DBGC ( sandev, "C/H/S %d/%d/%d out of range for geometry "
|
|
"%d/%d/%d\n", cylinder, head, sector, int13->cylinders,
|
|
int13->heads, int13->sectors_per_track );
|
|
return -INT13_STATUS_INVALID;
|
|
}
|
|
lba = ( ( ( ( cylinder * int13->heads ) + head )
|
|
* int13->sectors_per_track ) + sector - 1 );
|
|
count = ix86->regs.al;
|
|
buffer = real_to_user ( ix86->segs.es, ix86->regs.bx );
|
|
|
|
DBGC2 ( sandev, "C/H/S %d/%d/%d = LBA %08lx <-> %04x:%04x (count %d)\n",
|
|
cylinder, head, sector, lba, ix86->segs.es, ix86->regs.bx,
|
|
count );
|
|
|
|
/* Read from / write to block device */
|
|
if ( ( rc = sandev_rw ( sandev, lba, count, buffer ) ) != 0 ){
|
|
DBGC ( sandev, "INT13 drive %02x I/O failed: %s\n",
|
|
sandev->drive, strerror ( rc ) );
|
|
return -INT13_STATUS_READ_ERROR;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* INT 13, 02 - Read sectors
|
|
*
|
|
* @v sandev SAN device
|
|
* @v al Number of sectors to read (must be nonzero)
|
|
* @v ch Low bits of cylinder number
|
|
* @v cl (bits 7:6) High bits of cylinder number
|
|
* @v cl (bits 5:0) Sector number
|
|
* @v dh Head number
|
|
* @v es:bx Data buffer
|
|
* @ret status Status code
|
|
* @ret al Number of sectors read
|
|
*/
|
|
static int int13_read_sectors ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
|
|
DBGC2 ( sandev, "Read: " );
|
|
return int13_rw_sectors ( sandev, ix86, sandev_read );
|
|
}
|
|
|
|
/**
|
|
* INT 13, 03 - Write sectors
|
|
*
|
|
* @v sandev SAN device
|
|
* @v al Number of sectors to write (must be nonzero)
|
|
* @v ch Low bits of cylinder number
|
|
* @v cl (bits 7:6) High bits of cylinder number
|
|
* @v cl (bits 5:0) Sector number
|
|
* @v dh Head number
|
|
* @v es:bx Data buffer
|
|
* @ret status Status code
|
|
* @ret al Number of sectors written
|
|
*/
|
|
static int int13_write_sectors ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
|
|
DBGC2 ( sandev, "Write: " );
|
|
return int13_rw_sectors ( sandev, ix86, sandev_write );
|
|
}
|
|
|
|
/**
|
|
* INT 13, 08 - Get drive parameters
|
|
*
|
|
* @v sandev SAN device
|
|
* @ret status Status code
|
|
* @ret ch Low bits of maximum cylinder number
|
|
* @ret cl (bits 7:6) High bits of maximum cylinder number
|
|
* @ret cl (bits 5:0) Maximum sector number
|
|
* @ret dh Maximum head number
|
|
* @ret dl Number of drives
|
|
*/
|
|
static int int13_get_parameters ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
struct int13_data *int13 = sandev->priv;
|
|
unsigned int max_cylinder = int13->cylinders - 1;
|
|
unsigned int max_head = int13->heads - 1;
|
|
unsigned int max_sector = int13->sectors_per_track; /* sic */
|
|
|
|
DBGC2 ( sandev, "Get drive parameters\n" );
|
|
|
|
/* Validate blocksize */
|
|
if ( sandev_blksize ( sandev ) != INT13_BLKSIZE ) {
|
|
DBGC ( sandev, "\nINT 13 drive %02x invalid blocksize (%zd) "
|
|
"for non-extended parameters\n",
|
|
sandev->drive, sandev_blksize ( sandev ) );
|
|
return -INT13_STATUS_INVALID;
|
|
}
|
|
|
|
/* Common parameters */
|
|
ix86->regs.ch = ( max_cylinder & 0xff );
|
|
ix86->regs.cl = ( ( ( max_cylinder >> 8 ) << 6 ) | max_sector );
|
|
ix86->regs.dh = max_head;
|
|
ix86->regs.dl = ( int13_is_fdd ( sandev ) ? num_fdds : num_drives );
|
|
|
|
/* Floppy-specific parameters */
|
|
if ( int13_is_fdd ( sandev ) ) {
|
|
ix86->regs.bl = INT13_FDD_TYPE_1M44;
|
|
ix86->segs.es = rm_ds;
|
|
ix86->regs.di = __from_data16 ( &int13_fdd_params );
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* INT 13, 15 - Get disk type
|
|
*
|
|
* @v sandev SAN device
|
|
* @ret ah Type code
|
|
* @ret cx:dx Sector count
|
|
* @ret status Status code / disk type
|
|
*/
|
|
static int int13_get_disk_type ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
uint32_t blocks;
|
|
|
|
DBGC2 ( sandev, "Get disk type\n" );
|
|
|
|
if ( int13_is_fdd ( sandev ) ) {
|
|
return INT13_DISK_TYPE_FDD;
|
|
} else {
|
|
blocks = int13_capacity32 ( sandev );
|
|
ix86->regs.cx = ( blocks >> 16 );
|
|
ix86->regs.dx = ( blocks & 0xffff );
|
|
return INT13_DISK_TYPE_HDD;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* INT 13, 41 - Extensions installation check
|
|
*
|
|
* @v sandev SAN device
|
|
* @v bx 0x55aa
|
|
* @ret bx 0xaa55
|
|
* @ret cx Extensions API support bitmap
|
|
* @ret status Status code / API version
|
|
*/
|
|
static int int13_extension_check ( struct san_device *sandev __unused,
|
|
struct i386_all_regs *ix86 ) {
|
|
|
|
if ( ix86->regs.bx == 0x55aa ) {
|
|
DBGC2 ( sandev, "INT13 extensions installation check\n" );
|
|
ix86->regs.bx = 0xaa55;
|
|
ix86->regs.cx = ( INT13_EXTENSION_LINEAR |
|
|
INT13_EXTENSION_EDD |
|
|
INT13_EXTENSION_64BIT );
|
|
return INT13_EXTENSION_VER_3_0;
|
|
} else {
|
|
return -INT13_STATUS_INVALID;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Extended read / write
|
|
*
|
|
* @v sandev SAN device
|
|
* @v ds:si Disk address packet
|
|
* @v sandev_rw SAN device read/write method
|
|
* @ret status Status code
|
|
*/
|
|
static int int13_extended_rw ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86,
|
|
int ( * sandev_rw ) ( struct san_device *sandev,
|
|
uint64_t lba,
|
|
unsigned int count,
|
|
userptr_t buffer ) ) {
|
|
struct int13_disk_address addr;
|
|
uint8_t bufsize;
|
|
uint64_t lba;
|
|
unsigned long count;
|
|
userptr_t buffer;
|
|
int rc;
|
|
|
|
/* Extended reads are not allowed on floppy drives.
|
|
* ELTORITO.SYS seems to assume that we are really a CD-ROM if
|
|
* we support extended reads for a floppy drive.
|
|
*/
|
|
if ( int13_is_fdd ( sandev ) )
|
|
return -INT13_STATUS_INVALID;
|
|
|
|
/* Get buffer size */
|
|
get_real ( bufsize, ix86->segs.ds,
|
|
( ix86->regs.si + offsetof ( typeof ( addr ), bufsize ) ) );
|
|
if ( bufsize < offsetof ( typeof ( addr ), buffer_phys ) ) {
|
|
DBGC2 ( sandev, "<invalid buffer size %#02x\n>\n", bufsize );
|
|
return -INT13_STATUS_INVALID;
|
|
}
|
|
|
|
/* Read parameters from disk address structure */
|
|
memset ( &addr, 0, sizeof ( addr ) );
|
|
copy_from_real ( &addr, ix86->segs.ds, ix86->regs.si, bufsize );
|
|
lba = addr.lba;
|
|
DBGC2 ( sandev, "LBA %08llx <-> ", ( ( unsigned long long ) lba ) );
|
|
if ( ( addr.count == 0xff ) ||
|
|
( ( addr.buffer.segment == 0xffff ) &&
|
|
( addr.buffer.offset == 0xffff ) ) ) {
|
|
buffer = phys_to_user ( addr.buffer_phys );
|
|
DBGC2 ( sandev, "%08llx",
|
|
( ( unsigned long long ) addr.buffer_phys ) );
|
|
} else {
|
|
buffer = real_to_user ( addr.buffer.segment,
|
|
addr.buffer.offset );
|
|
DBGC2 ( sandev, "%04x:%04x", addr.buffer.segment,
|
|
addr.buffer.offset );
|
|
}
|
|
if ( addr.count <= 0x7f ) {
|
|
count = addr.count;
|
|
} else if ( addr.count == 0xff ) {
|
|
count = addr.long_count;
|
|
} else {
|
|
DBGC2 ( sandev, " <invalid count %#02x>\n", addr.count );
|
|
return -INT13_STATUS_INVALID;
|
|
}
|
|
DBGC2 ( sandev, " (count %ld)\n", count );
|
|
|
|
/* Read from / write to block device */
|
|
if ( ( rc = sandev_rw ( sandev, lba, count, buffer ) ) != 0 ) {
|
|
DBGC ( sandev, "INT13 drive %02x extended I/O failed: %s\n",
|
|
sandev->drive, strerror ( rc ) );
|
|
/* Record that no blocks were transferred successfully */
|
|
addr.count = 0;
|
|
put_real ( addr.count, ix86->segs.ds,
|
|
( ix86->regs.si +
|
|
offsetof ( typeof ( addr ), count ) ) );
|
|
return -INT13_STATUS_READ_ERROR;
|
|
}
|
|
|
|
copy_to_real (ix86->segs.ds, ix86->regs.si, &addr, bufsize );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* INT 13, 42 - Extended read
|
|
*
|
|
* @v sandev SAN device
|
|
* @v ds:si Disk address packet
|
|
* @ret status Status code
|
|
*/
|
|
static int int13_extended_read ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
|
|
DBGC2 ( sandev, "Extended read: " );
|
|
return int13_extended_rw ( sandev, ix86, sandev_read );
|
|
}
|
|
|
|
/**
|
|
* INT 13, 43 - Extended write
|
|
*
|
|
* @v sandev SAN device
|
|
* @v ds:si Disk address packet
|
|
* @ret status Status code
|
|
*/
|
|
static int int13_extended_write ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
|
|
DBGC2 ( sandev, "Extended write: " );
|
|
return int13_extended_rw ( sandev, ix86, sandev_write );
|
|
}
|
|
|
|
/**
|
|
* INT 13, 44 - Verify sectors
|
|
*
|
|
* @v sandev SAN device
|
|
* @v ds:si Disk address packet
|
|
* @ret status Status code
|
|
*/
|
|
static int int13_extended_verify ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
struct int13_disk_address addr;
|
|
uint64_t lba;
|
|
unsigned long count;
|
|
|
|
/* Read parameters from disk address structure */
|
|
if ( DBG_EXTRA ) {
|
|
copy_from_real ( &addr, ix86->segs.ds, ix86->regs.si,
|
|
sizeof ( addr ));
|
|
lba = addr.lba;
|
|
count = addr.count;
|
|
DBGC2 ( sandev, "Verify: LBA %08llx (count %ld)\n",
|
|
( ( unsigned long long ) lba ), count );
|
|
}
|
|
|
|
/* We have no mechanism for verifying sectors */
|
|
return -INT13_STATUS_INVALID;
|
|
}
|
|
|
|
/**
|
|
* INT 13, 44 - Extended seek
|
|
*
|
|
* @v sandev SAN device
|
|
* @v ds:si Disk address packet
|
|
* @ret status Status code
|
|
*/
|
|
static int int13_extended_seek ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
struct int13_disk_address addr;
|
|
uint64_t lba;
|
|
unsigned long count;
|
|
|
|
/* Read parameters from disk address structure */
|
|
if ( DBG_EXTRA ) {
|
|
copy_from_real ( &addr, ix86->segs.ds, ix86->regs.si,
|
|
sizeof ( addr ));
|
|
lba = addr.lba;
|
|
count = addr.count;
|
|
DBGC2 ( sandev, "Seek: LBA %08llx (count %ld)\n",
|
|
( ( unsigned long long ) lba ), count );
|
|
}
|
|
|
|
/* Ignore and return success */
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Build device path information
|
|
*
|
|
* @v sandev SAN device
|
|
* @v dpi Device path information
|
|
* @ret rc Return status code
|
|
*/
|
|
static int int13_device_path_info ( struct san_device *sandev,
|
|
struct edd_device_path_information *dpi ) {
|
|
struct san_path *sanpath;
|
|
struct device *device;
|
|
struct device_description *desc;
|
|
unsigned int i;
|
|
uint8_t sum = 0;
|
|
int rc;
|
|
return -ECANCELED;
|
|
/* Reopen block device if necessary */
|
|
if ( sandev_needs_reopen ( sandev ) &&
|
|
( ( rc = sandev_reopen ( sandev ) ) != 0 ) )
|
|
return rc;
|
|
sanpath = sandev->active;
|
|
assert ( sanpath != NULL );
|
|
|
|
/* Get underlying hardware device */
|
|
device = identify_device ( &sanpath->block );
|
|
if ( ! device ) {
|
|
DBGC ( sandev, "INT13 drive %02x cannot identify hardware "
|
|
"device\n", sandev->drive );
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Fill in bus type and interface path */
|
|
desc = &device->desc;
|
|
switch ( desc->bus_type ) {
|
|
case BUS_TYPE_PCI:
|
|
dpi->host_bus_type.type = EDD_BUS_TYPE_PCI;
|
|
dpi->interface_path.pci.bus = PCI_BUS ( desc->location );
|
|
dpi->interface_path.pci.slot = PCI_SLOT ( desc->location );
|
|
dpi->interface_path.pci.function = PCI_FUNC ( desc->location );
|
|
dpi->interface_path.pci.channel = 0xff; /* unused */
|
|
break;
|
|
default:
|
|
DBGC ( sandev, "INT13 drive %02x unrecognised bus type %d\n",
|
|
sandev->drive, desc->bus_type );
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
/* Get EDD block device description */
|
|
if ( ( rc = edd_describe ( &sanpath->block, &dpi->interface_type,
|
|
&dpi->device_path ) ) != 0 ) {
|
|
DBGC ( sandev, "INT13 drive %02x cannot identify block device: "
|
|
"%s\n", sandev->drive, strerror ( rc ) );
|
|
return rc;
|
|
}
|
|
|
|
/* Fill in common fields and fix checksum */
|
|
dpi->key = EDD_DEVICE_PATH_INFO_KEY;
|
|
dpi->len = sizeof ( *dpi );
|
|
for ( i = 0 ; i < sizeof ( *dpi ) ; i++ )
|
|
sum += *( ( ( uint8_t * ) dpi ) + i );
|
|
dpi->checksum -= sum;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* INT 13, 48 - Get extended parameters
|
|
*
|
|
* @v sandev SAN device
|
|
* @v ds:si Drive parameter table
|
|
* @ret status Status code
|
|
*/
|
|
static int int13_get_extended_parameters ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
struct int13_data *int13 = sandev->priv;
|
|
struct int13_disk_parameters params;
|
|
struct segoff address;
|
|
size_t len = sizeof ( params );
|
|
uint16_t bufsize;
|
|
int rc;
|
|
|
|
/* Get buffer size */
|
|
get_real ( bufsize, ix86->segs.ds,
|
|
( ix86->regs.si + offsetof ( typeof ( params ), bufsize )));
|
|
|
|
DBGC2 ( sandev, "Get extended drive parameters to %04x:%04x+%02x\n",
|
|
ix86->segs.ds, ix86->regs.si, bufsize );
|
|
|
|
/* Build drive parameters */
|
|
memset ( ¶ms, 0, sizeof ( params ) );
|
|
params.flags = INT13_FL_DMA_TRANSPARENT;
|
|
if ( ( int13->cylinders < 1024 ) &&
|
|
( sandev_capacity ( sandev ) <= INT13_MAX_CHS_SECTORS ) ) {
|
|
params.flags |= INT13_FL_CHS_VALID;
|
|
}
|
|
params.cylinders = int13->cylinders;
|
|
params.heads = int13->heads;
|
|
params.sectors_per_track = int13->sectors_per_track;
|
|
params.sectors = sandev_capacity ( sandev );
|
|
params.sector_size = sandev_blksize ( sandev );
|
|
memset ( ¶ms.dpte, 0xff, sizeof ( params.dpte ) );
|
|
if ( ( rc = int13_device_path_info ( sandev, ¶ms.dpi ) ) != 0 ) {
|
|
DBGC ( sandev, "INT13 drive %02x could not provide device "
|
|
"path information: %s\n",
|
|
sandev->drive, strerror ( rc ) );
|
|
len = offsetof ( typeof ( params ), dpi );
|
|
}
|
|
|
|
/* Calculate returned "buffer size" (which will be less than
|
|
* the length actually copied if device path information is
|
|
* present).
|
|
*/
|
|
if ( bufsize < offsetof ( typeof ( params ), dpte ) )
|
|
return -INT13_STATUS_INVALID;
|
|
if ( bufsize < offsetof ( typeof ( params ), dpi ) ) {
|
|
params.bufsize = offsetof ( typeof ( params ), dpte );
|
|
} else {
|
|
params.bufsize = offsetof ( typeof ( params ), dpi );
|
|
}
|
|
|
|
DBGC ( sandev, "INT 13 drive %02x described using extended "
|
|
"parameters:\n", sandev->drive );
|
|
address.segment = ix86->segs.ds;
|
|
address.offset = ix86->regs.si;
|
|
DBGC_HDA ( sandev, address, ¶ms, len );
|
|
|
|
/* Return drive parameters */
|
|
if ( len > bufsize )
|
|
len = bufsize;
|
|
copy_to_real ( ix86->segs.ds, ix86->regs.si, ¶ms, len );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* INT 13, 4b - Get status or terminate CD-ROM emulation
|
|
*
|
|
* @v sandev SAN device
|
|
* @v ds:si Specification packet
|
|
* @ret status Status code
|
|
*/
|
|
static int int13_cdrom_status_terminate ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
struct int13_cdrom_specification specification;
|
|
|
|
DBGC2 ( sandev, "Get CD-ROM emulation status to %04x:%04x%s\n",
|
|
ix86->segs.ds, ix86->regs.si,
|
|
( ix86->regs.al ? "" : " and terminate" ) );
|
|
|
|
/* Fail if we are not a CD-ROM */
|
|
if ( ! sandev->is_cdrom ) {
|
|
DBGC ( sandev, "INT13 drive %02x is not a CD-ROM\n",
|
|
sandev->drive );
|
|
return -INT13_STATUS_INVALID;
|
|
}
|
|
|
|
/* Build specification packet */
|
|
memset ( &specification, 0, sizeof ( specification ) );
|
|
specification.size = sizeof ( specification );
|
|
specification.drive = sandev->drive;
|
|
|
|
/* Return specification packet */
|
|
copy_to_real ( ix86->segs.ds, ix86->regs.si, &specification,
|
|
sizeof ( specification ) );
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* INT 13, 4d - Read CD-ROM boot catalog
|
|
*
|
|
* @v sandev SAN device
|
|
* @v ds:si Command packet
|
|
* @ret status Status code
|
|
*/
|
|
static int int13_cdrom_read_boot_catalog ( struct san_device *sandev,
|
|
struct i386_all_regs *ix86 ) {
|
|
struct int13_data *int13 = sandev->priv;
|
|
struct int13_cdrom_boot_catalog_command command;
|
|
unsigned int start;
|
|
int rc;
|
|
|
|
/* Read parameters from command packet */
|
|
copy_from_real ( &command, ix86->segs.ds, ix86->regs.si,
|
|
sizeof ( command ) );
|
|
DBGC2 ( sandev, "Read CD-ROM boot catalog to %08x\n", command.buffer );
|
|
|
|
/* Fail if we have no boot catalog */
|
|
if ( ! int13->boot_catalog ) {
|
|
DBGC ( sandev, "INT13 drive %02x has no boot catalog\n",
|
|
sandev->drive );
|
|
return -INT13_STATUS_INVALID;
|
|
}
|
|
start = ( int13->boot_catalog + command.start );
|
|
|
|
/* Read from boot catalog */
|
|
if ( ( rc = sandev_read ( sandev, start, command.count,
|
|
phys_to_user ( command.buffer ) ) ) != 0 ) {
|
|
DBGC ( sandev, "INT13 drive %02x could not read boot catalog: "
|
|
"%s\n", sandev->drive, strerror ( rc ) );
|
|
return -INT13_STATUS_READ_ERROR;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* INT 13 handler
|
|
*
|
|
*/
|
|
static __asmcall void int13 ( struct i386_all_regs *ix86 ) {
|
|
int command = ix86->regs.ah;
|
|
unsigned int bios_drive = ix86->regs.dl;
|
|
struct san_device *sandev;
|
|
struct int13_data *int13;
|
|
int status;
|
|
|
|
/* We simulate a cdrom, so no need to sync hd drive number */
|
|
//int13_check_num_drives();
|
|
|
|
#if VTOY_DEBUG
|
|
printf("int13 0x%x 0x%x\n", bios_drive, command); sleep(1);
|
|
#endif
|
|
|
|
if (bios_drive == VENTOY_BIOS_FAKE_DRIVE)
|
|
{
|
|
ix86->regs.dl = g_sandev->exdrive;
|
|
return;
|
|
}
|
|
|
|
if (VENTOY_BOOT_FIXBIN_DRIVE == bios_drive && INT13_READ_SECTORS == command)
|
|
{
|
|
/* read sector 0 0x80 */
|
|
if (ix86->regs.dh == 0 && (ix86->regs.cl & 0x3f) == 1 && ix86->regs.al == 1)
|
|
{
|
|
userptr_t buffer;
|
|
|
|
buffer = real_to_user(ix86->segs.es, ix86->regs.bx);
|
|
if (buffer)
|
|
{
|
|
memset((void *)buffer, 0, 512);
|
|
}
|
|
|
|
ix86->regs.dl = 0x80;
|
|
ix86->regs.ah = 0;
|
|
|
|
/* Set OF to indicate to wrapper not to chain this call */
|
|
ix86->flags |= OF;
|
|
return;
|
|
}
|
|
}
|
|
|
|
// drive swap
|
|
if (g_drive_map1 >= 0x80 && g_drive_map2 >= 0x80)
|
|
{
|
|
if (bios_drive == g_drive_map1)
|
|
{
|
|
ix86->regs.dl = g_drive_map2;
|
|
return;
|
|
}
|
|
else if (bios_drive == g_drive_map2)
|
|
{
|
|
ix86->regs.dl = g_drive_map1;
|
|
return;
|
|
}
|
|
}
|
|
|
|
for_each_sandev ( sandev ) {
|
|
|
|
int13 = sandev->priv;
|
|
if ( bios_drive != sandev->drive ) {
|
|
/* Remap any accesses to this drive's natural number */
|
|
if ( bios_drive == int13->natural_drive ) {
|
|
DBGC2 ( sandev, "INT13,%02x (%02x) remapped to "
|
|
"(%02x)\n", ix86->regs.ah,
|
|
bios_drive, sandev->drive );
|
|
ix86->regs.dl = sandev->drive;
|
|
return;
|
|
} else if ( ( ( bios_drive & 0x7f ) == 0x7f ) &&
|
|
( command == INT13_CDROM_STATUS_TERMINATE )
|
|
&& sandev->is_cdrom ) {
|
|
|
|
/* Catch non-drive-specific CD-ROM calls */
|
|
} else {
|
|
return;
|
|
}
|
|
}
|
|
|
|
sandev->int13_command = command;
|
|
sandev->x86_regptr = ix86;
|
|
|
|
DBGC2 ( sandev, "INT13,%02x (%02x): ",
|
|
ix86->regs.ah, bios_drive );
|
|
|
|
switch ( command ) {
|
|
case INT13_RESET:
|
|
status = int13_reset ( sandev, ix86 );
|
|
break;
|
|
case INT13_GET_LAST_STATUS:
|
|
status = int13_get_last_status ( sandev, ix86 );
|
|
break;
|
|
case INT13_READ_SECTORS:
|
|
status = int13_read_sectors ( sandev, ix86 );
|
|
break;
|
|
case INT13_WRITE_SECTORS:
|
|
status = int13_write_sectors ( sandev, ix86 );
|
|
break;
|
|
case INT13_GET_PARAMETERS:
|
|
status = int13_get_parameters ( sandev, ix86 );
|
|
break;
|
|
case INT13_GET_DISK_TYPE:
|
|
status = int13_get_disk_type ( sandev, ix86 );
|
|
break;
|
|
case INT13_EXTENSION_CHECK:
|
|
status = int13_extension_check ( sandev, ix86 );
|
|
break;
|
|
case INT13_EXTENDED_READ:
|
|
status = int13_extended_read ( sandev, ix86 );
|
|
break;
|
|
case INT13_EXTENDED_WRITE:
|
|
status = int13_extended_write ( sandev, ix86 );
|
|
break;
|
|
case INT13_EXTENDED_VERIFY:
|
|
status = int13_extended_verify ( sandev, ix86 );
|
|
break;
|
|
case INT13_EXTENDED_SEEK:
|
|
status = int13_extended_seek ( sandev, ix86 );
|
|
break;
|
|
case INT13_GET_EXTENDED_PARAMETERS:
|
|
status = int13_get_extended_parameters ( sandev, ix86 );
|
|
break;
|
|
case INT13_CDROM_STATUS_TERMINATE:
|
|
status = int13_cdrom_status_terminate ( sandev, ix86 );
|
|
break;
|
|
case INT13_CDROM_READ_BOOT_CATALOG:
|
|
status = int13_cdrom_read_boot_catalog ( sandev, ix86 );
|
|
break;
|
|
default:
|
|
DBGC2 ( sandev, "*** Unrecognised INT13 ***\n" );
|
|
status = -INT13_STATUS_INVALID;
|
|
break;
|
|
}
|
|
|
|
/* Store status for INT 13,01 */
|
|
int13->last_status = status;
|
|
|
|
/* Negative status indicates an error */
|
|
if ( status < 0 ) {
|
|
status = -status;
|
|
DBGC ( sandev, "INT13,%02x (%02x) failed with status "
|
|
"%02x\n", ix86->regs.ah, sandev->drive, status );
|
|
} else {
|
|
ix86->flags &= ~CF;
|
|
}
|
|
ix86->regs.ah = status;
|
|
|
|
/* Set OF to indicate to wrapper not to chain this call */
|
|
ix86->flags |= OF;
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Hook INT 13 handler
|
|
*
|
|
*/
|
|
static void int13_hook_vector ( void ) {
|
|
/* Assembly wrapper to call int13(). int13() sets OF if we
|
|
* should not chain to the previous handler. (The wrapper
|
|
* clears CF and OF before calling int13()).
|
|
*/
|
|
__asm__ __volatile__ (
|
|
TEXT16_CODE ( "\nint13_wrapper:\n\t"
|
|
/* Preserve %ax and %dx for future reference */
|
|
"pushw %%bp\n\t"
|
|
"movw %%sp, %%bp\n\t"
|
|
"pushw %%ax\n\t"
|
|
"pushw %%dx\n\t"
|
|
/* Clear OF, set CF, call int13() */
|
|
"orb $0, %%al\n\t"
|
|
"stc\n\t"
|
|
VIRT_CALL ( int13 )
|
|
/* Chain if OF not set */
|
|
"jo 1f\n\t"
|
|
"pushfw\n\t"
|
|
"lcall *%%cs:int13_vector\n\t"
|
|
"\n1:\n\t"
|
|
/* Overwrite flags for iret */
|
|
"pushfw\n\t"
|
|
"popw 6(%%bp)\n\t"
|
|
/* Fix up %dl:
|
|
*
|
|
* INT 13,15 : do nothing if hard disk
|
|
* INT 13,08 : load with number of drives
|
|
* all others: restore original value
|
|
*/
|
|
"cmpb $0x15, -1(%%bp)\n\t"
|
|
"jne 2f\n\t"
|
|
"testb $0x80, -4(%%bp)\n\t"
|
|
"jnz 3f\n\t"
|
|
"\n2:\n\t"
|
|
"movb -4(%%bp), %%dl\n\t"
|
|
"cmpb $0x08, -1(%%bp)\n\t"
|
|
"jne 3f\n\t"
|
|
"testb $0x80, %%dl\n\t"
|
|
"movb %%cs:num_drives, %%dl\n\t"
|
|
"jnz 3f\n\t"
|
|
"movb %%cs:num_fdds, %%dl\n\t"
|
|
/* Return */
|
|
"\n3:\n\t"
|
|
"movw %%bp, %%sp\n\t"
|
|
"popw %%bp\n\t"
|
|
"iret\n\t" ) : : );
|
|
|
|
hook_bios_interrupt ( 0x13, ( intptr_t ) int13_wrapper, &int13_vector );
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Load and verify master boot record from INT 13 drive
|
|
*
|
|
* @v drive Drive number
|
|
* @v address Boot code address to fill in
|
|
* @ret rc Return status code
|
|
*/
|
|
static int int13_load_mbr ( unsigned int drive, struct segoff *address ) {
|
|
uint16_t magic;
|
|
|
|
address->segment = 0;
|
|
address->offset = 0x7c00;
|
|
copy_to_real(address->segment, address->offset, g_sandev->boot_catalog_sector, 512);
|
|
|
|
/* Check magic signature */
|
|
get_real ( magic, address->segment, (address->offset + offsetof ( struct master_boot_record, magic ) ) );
|
|
|
|
if ( magic != INT13_MBR_MAGIC ) {
|
|
DBG ( "INT13 drive %02x does not contain a valid MBR\n",
|
|
drive );
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** El Torito boot catalog command packet */
|
|
static struct int13_cdrom_boot_catalog_command __data16 ( eltorito_cmd ) = {
|
|
.size = sizeof ( struct int13_cdrom_boot_catalog_command ),
|
|
.count = 1,
|
|
.buffer = 0x7c00,
|
|
.start = 0,
|
|
};
|
|
#define eltorito_cmd __use_data16 ( eltorito_cmd )
|
|
|
|
/** El Torito disk address packet */
|
|
static struct int13_disk_address __bss16 ( eltorito_address );
|
|
#define eltorito_address __use_data16 ( eltorito_address )
|
|
|
|
/**
|
|
* Load and verify El Torito boot record from INT 13 drive
|
|
*
|
|
* @v drive Drive number
|
|
* @v address Boot code address to fill in
|
|
* @ret rc Return status code
|
|
*/
|
|
static int int13_load_eltorito ( unsigned int drive, struct segoff *address ) {
|
|
struct {
|
|
struct eltorito_validation_entry valid;
|
|
struct eltorito_boot_entry boot;
|
|
} __attribute__ (( packed )) catalog;
|
|
uint16_t status;
|
|
|
|
if (g_sandev && g_sandev->drive == drive)
|
|
{
|
|
copy_to_user(phys_to_user ( eltorito_cmd.buffer ), 0, g_sandev->boot_catalog_sector, sizeof(g_sandev->boot_catalog_sector));
|
|
}
|
|
else
|
|
{
|
|
/* Use INT 13, 4d to read the boot catalog */
|
|
__asm__ __volatile__ ( REAL_CODE ( "stc\n\t"
|
|
"sti\n\t"
|
|
"int $0x13\n\t"
|
|
"sti\n\t" /* BIOS bugs */
|
|
"jc 1f\n\t"
|
|
"xorw %%ax, %%ax\n\t"
|
|
"\n1:\n\t" )
|
|
: "=a" ( status )
|
|
: "a" ( 0x4d00 ), "d" ( drive ),
|
|
"S" ( __from_data16 ( &eltorito_cmd ) ) );
|
|
if ( status ) {
|
|
DBG ( "INT13 drive %02x could not read El Torito boot catalog "
|
|
"(status %04x)\n", drive, status );
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
copy_from_user ( &catalog, phys_to_user ( eltorito_cmd.buffer ), 0,
|
|
sizeof ( catalog ) );
|
|
|
|
/* Sanity checks */
|
|
if ( catalog.valid.platform_id != ELTORITO_PLATFORM_X86 ) {
|
|
DBG ( "INT13 drive %02x El Torito specifies unknown platform "
|
|
"%02x\n", drive, catalog.valid.platform_id );
|
|
return -ENOEXEC;
|
|
}
|
|
if ( catalog.boot.indicator != ELTORITO_BOOTABLE ) {
|
|
DBG ( "INT13 drive %02x El Torito is not bootable\n", drive );
|
|
return -ENOEXEC;
|
|
}
|
|
if ( catalog.boot.media_type != ELTORITO_NO_EMULATION ) {
|
|
DBG ( "INT13 drive %02x El Torito requires emulation "
|
|
"type %02x\n", drive, catalog.boot.media_type );
|
|
return -ENOTSUP;
|
|
}
|
|
DBG ( "INT13 drive %02x El Torito boot image at LBA %08x (count %d)\n",
|
|
drive, catalog.boot.start, catalog.boot.length );
|
|
address->segment = ( catalog.boot.load_segment ?
|
|
catalog.boot.load_segment : 0x7c0 );
|
|
address->offset = 0;
|
|
DBG ( "INT13 drive %02x El Torito boot image loads at %04x:%04x\n",
|
|
drive, address->segment, address->offset );
|
|
|
|
if (catalog.boot.length > 256)
|
|
{
|
|
if (g_debug)
|
|
{
|
|
printf("trim length from %d to 4\n", catalog.boot.length);
|
|
}
|
|
catalog.boot.length = 4;
|
|
}
|
|
|
|
/* Use INT 13, 42 to read the boot image */
|
|
eltorito_address.bufsize =
|
|
offsetof ( typeof ( eltorito_address ), buffer_phys );
|
|
eltorito_address.count = catalog.boot.length;
|
|
eltorito_address.buffer = *address;
|
|
eltorito_address.lba = catalog.boot.start;
|
|
__asm__ __volatile__ ( REAL_CODE ( "stc\n\t"
|
|
"sti\n\t"
|
|
"int $0x13\n\t"
|
|
"sti\n\t" /* BIOS bugs */
|
|
"jc 1f\n\t"
|
|
"xorw %%ax, %%ax\n\t"
|
|
"\n1:\n\t" )
|
|
: "=a" ( status )
|
|
: "a" ( 0x4200 ), "d" ( drive ),
|
|
"S" ( __from_data16 ( &eltorito_address ) ) );
|
|
if ( status ) {
|
|
DBG ( "INT13 drive %02x could not read El Torito boot image "
|
|
"(status %04x)\n", drive, status );
|
|
return -EIO;
|
|
}
|
|
|
|
if (catalog.boot.length > 4)
|
|
{
|
|
isolinux_boot_info *bootinfo = NULL;
|
|
bootinfo = (isolinux_boot_info *)(real_to_user(address->segment, address->offset));
|
|
if (0x7C6CEAFA == bootinfo->isolinux0 && 0x90900000 == bootinfo->isolinux1)
|
|
{
|
|
if (bootinfo->BootFileLocation == 0 && bootinfo->PvdLocation == 16 &&
|
|
(bootinfo->BootFileLen / 2048) < catalog.boot.length && bootinfo->BootFileChecksum > 0)
|
|
{
|
|
if (g_debug)
|
|
{
|
|
printf("isolinux file location is 0, now fix it to %u ...\n", catalog.boot.start);
|
|
ventoy_debug_pause();
|
|
}
|
|
bootinfo->BootFileLocation = catalog.boot.start;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Hook INT 13 SAN device
|
|
*
|
|
* @v drive Drive number
|
|
* @v uris List of URIs
|
|
* @v count Number of URIs
|
|
* @v flags Flags
|
|
* @ret drive Drive number, or negative error
|
|
*
|
|
* Registers the drive with the INT 13 emulation subsystem, and hooks
|
|
* the INT 13 interrupt vector (if not already hooked).
|
|
*/
|
|
unsigned int ventoy_int13_hook (ventoy_chain_head *chain)
|
|
{
|
|
unsigned int blocks;
|
|
unsigned int blocks_per_cyl;
|
|
unsigned int natural_drive;
|
|
struct int13_data *int13;
|
|
|
|
/* We simulate a cdrom, so no need to sync hd drive number */
|
|
//int13_sync_num_drives();
|
|
|
|
/* hook will copy num_drives to dl when int13 08 was called, so must initialize it's value */
|
|
get_real(num_drives, BDA_SEG, BDA_NUM_DRIVES);
|
|
|
|
if (g_hddmode)
|
|
{
|
|
natural_drive = g_bios_disk80 ? 0x80 : (num_drives | 0x80);
|
|
}
|
|
else
|
|
{
|
|
natural_drive = 0xE0; /* just set a cdrom drive number 224 */
|
|
}
|
|
|
|
if (chain->os_param.vtoy_reserved[6])
|
|
{
|
|
if (g_hddmode)
|
|
{
|
|
/* drive map no need for linux vtoy/img boot */
|
|
}
|
|
else
|
|
{
|
|
g_drive_map1 = 0x80;
|
|
g_drive_map2 = 0x81;
|
|
}
|
|
}
|
|
else if (chain->disk_drive >= 0x80 && chain->drive_map >= 0x80)
|
|
{
|
|
g_drive_map1 = chain->disk_drive;
|
|
g_drive_map2 = chain->drive_map;
|
|
}
|
|
|
|
/* a fake sandev */
|
|
g_sandev = zalloc(sizeof(struct san_device) + sizeof(struct int13_data));
|
|
g_sandev->priv = int13 = (struct int13_data *)(g_sandev + 1);
|
|
g_sandev->drive = int13->natural_drive = natural_drive;
|
|
g_sandev->is_cdrom = g_hddmode ? 0 : 1;
|
|
g_sandev->blksize_shift = g_hddmode ? 0 : 2;
|
|
g_sandev->capacity.blksize = 512;
|
|
g_sandev->capacity.blocks = chain->virt_img_size_in_bytes / 512;
|
|
g_sandev->exdrive = chain->disk_drive;
|
|
int13->boot_catalog = chain->boot_catalog;
|
|
memcpy(g_sandev->boot_catalog_sector, chain->boot_catalog_sector, sizeof(chain->boot_catalog_sector));
|
|
|
|
|
|
/* Apply guesses if no geometry already specified */
|
|
if ( ! int13->heads )
|
|
int13->heads = 255;
|
|
if ( ! int13->sectors_per_track )
|
|
int13->sectors_per_track = 63;
|
|
if ( ! int13->cylinders ) {
|
|
/* Avoid attempting a 64-bit divide on a 32-bit system */
|
|
blocks = int13_capacity32 ( g_sandev );
|
|
blocks_per_cyl = ( int13->heads * int13->sectors_per_track );
|
|
|
|
int13->cylinders = ( blocks / blocks_per_cyl );
|
|
if ( int13->cylinders > 1024 )
|
|
int13->cylinders = 1024;
|
|
}
|
|
|
|
/* Hook INT 13 vector if not already hooked */
|
|
int13_hook_vector();
|
|
|
|
/* Update BIOS drive count */
|
|
//int13_sync_num_drives();
|
|
|
|
return natural_drive;
|
|
}
|
|
|
|
static uint8_t __bss16_array ( xbftab, [512 + 128])
|
|
__attribute__ (( aligned ( 16 ) ));
|
|
#define xbftab __use_data16 ( xbftab )
|
|
|
|
void * ventoy_get_runtime_addr(void)
|
|
{
|
|
return (void *)user_to_phys((userptr_t)(&xbftab), 0);
|
|
}
|
|
|
|
/**
|
|
* Attempt to boot from an INT 13 drive
|
|
*
|
|
* @v drive Drive number
|
|
* @v filename Filename (or NULL to use default)
|
|
* @ret rc Return status code
|
|
*
|
|
* This boots from the specified INT 13 drive by loading the Master
|
|
* Boot Record to 0000:7c00 and jumping to it. INT 18 is hooked to
|
|
* capture an attempt by the MBR to boot the next device. (This is
|
|
* the closest thing to a return path from an MBR).
|
|
*
|
|
* Note that this function can never return success, by definition.
|
|
*/
|
|
int ventoy_int13_boot ( unsigned int drive, void *imginfo, const char *cmdline) {
|
|
//struct memory_map memmap;
|
|
int rc;
|
|
int headlen;
|
|
struct segoff address;
|
|
struct acpi_header *acpi = NULL;
|
|
struct ibft_table *ibft = NULL;
|
|
|
|
/* Look for a usable boot sector */
|
|
if (g_hddmode)
|
|
{
|
|
if ((rc = int13_load_mbr(drive, &address)) != 0)
|
|
{
|
|
printf("int13_load_mbr %d\n", rc);
|
|
return rc;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if ( ( ( rc = int13_load_eltorito ( drive, &address ) ) != 0 ) &&
|
|
( ( rc = int13_load_mbr ( drive, &address ) ) != 0 ))
|
|
return rc;
|
|
}
|
|
|
|
if (imginfo)
|
|
{
|
|
if (strstr(cmdline, "ibft"))
|
|
{
|
|
headlen = 80;
|
|
ibft = (struct ibft_table *)(&xbftab);
|
|
acpi = &(ibft->acpi);
|
|
memset(ibft, 0, headlen);
|
|
|
|
acpi->signature = IBFT_SIG;
|
|
acpi->length = headlen + sizeof(ventoy_os_param);
|
|
acpi->revision = 1;
|
|
strncpy(acpi->oem_id, "ventoy", sizeof(acpi->oem_id));
|
|
strncpy(acpi->oem_table_id, "runtime", sizeof(acpi->oem_table_id));
|
|
memcpy((uint8_t *)ibft + headlen, imginfo, sizeof(ventoy_os_param));
|
|
acpi_fix_checksum(acpi);
|
|
}
|
|
else
|
|
{
|
|
memcpy((&xbftab), imginfo, sizeof(ventoy_os_param));
|
|
}
|
|
}
|
|
|
|
/* Dump out memory map prior to boot, if memmap debugging is
|
|
* enabled. Not required for program flow, but we have so
|
|
* many problems that turn out to be memory-map related that
|
|
* it's worth doing.
|
|
*/
|
|
//get_memmap ( &memmap );
|
|
|
|
DBGC(g_sandev, "start to boot ...\n");
|
|
|
|
/* Jump to boot sector */
|
|
if ( ( rc = call_bootsector ( address.segment, address.offset,
|
|
drive ) ) != 0 ) {
|
|
return rc;
|
|
}
|
|
|
|
return -ECANCELED; /* -EIMPOSSIBLE */
|
|
}
|
|
|