391 lines
8.7 KiB
C
391 lines
8.7 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* Copyright (c) 2001 John H. Baldwin <jhb@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* BIOS CD device handling for CD's that have been booted off of via no
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* emulation booting as defined in the El Torito standard.
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*
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* Ideas and algorithms from:
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*
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* - FreeBSD libi386/biosdisk.c
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*
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*/
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#include <stand.h>
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#include <sys/param.h>
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#include <machine/bootinfo.h>
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#include <stdarg.h>
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#include <bootstrap.h>
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#include <btxv86.h>
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#include <edd.h>
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#include "libi386.h"
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#define BIOSCD_SECSIZE 2048
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#define BUFSIZE (1 * BIOSCD_SECSIZE)
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#define MAXBCDEV 1
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/* Major numbers for devices we frontend for. */
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#define ACDMAJOR 117
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#define CDMAJOR 15
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#ifdef DISK_DEBUG
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# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args)
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#else
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# define DEBUG(fmt, args...)
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#endif
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struct specification_packet {
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u_char sp_size;
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u_char sp_bootmedia;
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u_char sp_drive;
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u_char sp_controller;
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u_int sp_lba;
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u_short sp_devicespec;
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u_short sp_buffersegment;
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u_short sp_loadsegment;
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u_short sp_sectorcount;
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u_short sp_cylsec;
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u_char sp_head;
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};
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/*
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* List of BIOS devices, translation from disk unit number to
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* BIOS unit number.
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*/
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static struct bcinfo {
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int bc_unit; /* BIOS unit number */
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struct specification_packet bc_sp;
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} bcinfo [MAXBCDEV];
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static int nbcinfo = 0;
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static int bc_read(int unit, daddr_t dblk, int blks, caddr_t dest);
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static int bc_init(void);
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static int bc_strategy(void *devdata, int flag, daddr_t dblk,
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size_t size, char *buf, size_t *rsize);
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static int bc_open(struct open_file *f, ...);
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static int bc_close(struct open_file *f);
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static void bc_print(int verbose);
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struct devsw bioscd = {
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"cd",
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DEVT_CD,
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bc_init,
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bc_strategy,
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bc_open,
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bc_close,
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noioctl,
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bc_print,
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NULL
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};
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/*
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* Translate between BIOS device numbers and our private unit numbers.
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*/
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int
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bc_bios2unit(int biosdev)
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{
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int i;
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DEBUG("looking for bios device 0x%x", biosdev);
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for (i = 0; i < nbcinfo; i++) {
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DEBUG("bc unit %d is BIOS device 0x%x", i, bcinfo[i].bc_unit);
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if (bcinfo[i].bc_unit == biosdev)
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return(i);
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}
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return(-1);
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}
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int
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bc_unit2bios(int unit)
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{
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if ((unit >= 0) && (unit < nbcinfo))
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return(bcinfo[unit].bc_unit);
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return(-1);
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}
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/*
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* We can't quiz, we have to be told what device to use, so this functoin
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* doesn't do anything. Instead, the loader calls bc_add() with the BIOS
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* device number to add.
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*/
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static int
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bc_init(void)
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{
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return (0);
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}
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int
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bc_add(int biosdev)
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{
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if (nbcinfo >= MAXBCDEV)
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return (-1);
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bcinfo[nbcinfo].bc_unit = biosdev;
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v86.ctl = V86_FLAGS;
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v86.addr = 0x13;
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v86.eax = 0x4b01;
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v86.edx = biosdev;
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v86.ds = VTOPSEG(&bcinfo[nbcinfo].bc_sp);
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v86.esi = VTOPOFF(&bcinfo[nbcinfo].bc_sp);
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v86int();
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if ((v86.eax & 0xff00) != 0)
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return (-1);
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printf("BIOS CD is cd%d\n", nbcinfo);
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nbcinfo++;
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return(0);
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}
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/*
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* Print information about disks
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*/
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static void
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bc_print(int verbose)
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{
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char line[80];
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int i;
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for (i = 0; i < nbcinfo; i++) {
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sprintf(line, " cd%d: Device 0x%x\n", i,
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bcinfo[i].bc_sp.sp_devicespec);
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pager_output(line);
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}
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}
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/*
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* Attempt to open the disk described by (dev) for use by (f).
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*/
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static int
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bc_open(struct open_file *f, ...)
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{
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va_list ap;
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struct i386_devdesc *dev;
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va_start(ap, f);
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dev = va_arg(ap, struct i386_devdesc *);
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va_end(ap);
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if (dev->d_unit >= nbcinfo) {
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DEBUG("attempt to open nonexistent disk");
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return(ENXIO);
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}
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return(0);
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}
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static int
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bc_close(struct open_file *f)
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{
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return(0);
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}
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static int
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bc_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf,
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size_t *rsize)
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{
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struct i386_devdesc *dev;
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int unit;
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int blks;
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#ifdef BD_SUPPORT_FRAGS
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char fragbuf[BIOSCD_SECSIZE];
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size_t fragsize;
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fragsize = size % BIOSCD_SECSIZE;
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#else
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if (size % BIOSCD_SECSIZE)
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return (EINVAL);
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#endif
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if (rw != F_READ)
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return(EROFS);
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dev = (struct i386_devdesc *)devdata;
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unit = dev->d_unit;
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blks = size / BIOSCD_SECSIZE;
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if (dblk % (BIOSCD_SECSIZE / DEV_BSIZE) != 0)
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return (EINVAL);
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dblk /= (BIOSCD_SECSIZE / DEV_BSIZE);
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DEBUG("read %d from %lld to %p", blks, dblk, buf);
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if (rsize)
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*rsize = 0;
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if (blks && bc_read(unit, dblk, blks, buf)) {
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DEBUG("read error");
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return (EIO);
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}
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#ifdef BD_SUPPORT_FRAGS
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DEBUG("frag read %d from %lld+%d to %p",
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fragsize, dblk, blks, buf + (blks * BIOSCD_SECSIZE));
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if (fragsize && bc_read(unit, dblk + blks, 1, fragbuf)) {
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DEBUG("frag read error");
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return(EIO);
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}
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bcopy(fragbuf, buf + (blks * BIOSCD_SECSIZE), fragsize);
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#endif
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if (rsize)
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*rsize = size;
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return (0);
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}
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/* Max number of sectors to bounce-buffer at a time. */
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#define CD_BOUNCEBUF 8
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static int
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bc_read(int unit, daddr_t dblk, int blks, caddr_t dest)
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{
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u_int maxfer, resid, result, retry, x;
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caddr_t bbuf, p, xp;
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static struct edd_packet packet;
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int biosdev;
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#ifdef DISK_DEBUG
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int error;
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#endif
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/* Just in case some idiot actually tries to read -1 blocks... */
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if (blks < 0)
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return (-1);
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/* If nothing to do, just return succcess. */
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if (blks == 0)
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return (0);
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/* Decide whether we have to bounce */
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if (VTOP(dest) >> 20 != 0) {
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/*
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* The destination buffer is above first 1MB of
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* physical memory so we have to arrange a suitable
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* bounce buffer.
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*/
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x = min(CD_BOUNCEBUF, (unsigned)blks);
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bbuf = alloca(x * BIOSCD_SECSIZE);
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maxfer = x;
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} else {
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bbuf = NULL;
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maxfer = 0;
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}
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biosdev = bc_unit2bios(unit);
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resid = blks;
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p = dest;
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while (resid > 0) {
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if (bbuf)
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xp = bbuf;
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else
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xp = p;
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x = resid;
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if (maxfer > 0)
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x = min(x, maxfer);
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/*
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* Loop retrying the operation a couple of times. The BIOS
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* may also retry.
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*/
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for (retry = 0; retry < 3; retry++) {
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/* If retrying, reset the drive */
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if (retry > 0) {
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v86.ctl = V86_FLAGS;
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v86.addr = 0x13;
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v86.eax = 0;
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v86.edx = biosdev;
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v86int();
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}
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packet.len = sizeof(struct edd_packet);
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packet.count = x;
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packet.off = VTOPOFF(xp);
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packet.seg = VTOPSEG(xp);
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packet.lba = dblk;
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v86.ctl = V86_FLAGS;
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v86.addr = 0x13;
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v86.eax = 0x4200;
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v86.edx = biosdev;
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v86.ds = VTOPSEG(&packet);
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v86.esi = VTOPOFF(&packet);
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v86int();
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result = V86_CY(v86.efl);
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if (result == 0)
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break;
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}
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#ifdef DISK_DEBUG
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error = (v86.eax >> 8) & 0xff;
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#endif
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DEBUG("%d sectors from %lld to %p (0x%x) %s", x, dblk, p,
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VTOP(p), result ? "failed" : "ok");
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DEBUG("unit %d status 0x%x", unit, error);
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if (bbuf != NULL)
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bcopy(bbuf, p, x * BIOSCD_SECSIZE);
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p += (x * BIOSCD_SECSIZE);
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dblk += x;
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resid -= x;
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}
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/* hexdump(dest, (blks * BIOSCD_SECSIZE)); */
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return(0);
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}
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/*
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* Return a suitable dev_t value for (dev).
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*/
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int
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bc_getdev(struct i386_devdesc *dev)
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{
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int biosdev, unit;
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int major;
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int rootdev;
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unit = dev->d_unit;
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biosdev = bc_unit2bios(unit);
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DEBUG("unit %d BIOS device %d", unit, biosdev);
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if (biosdev == -1) /* not a BIOS device */
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return(-1);
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/*
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* XXX: Need to examine device spec here to figure out if SCSI or
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* ATAPI. No idea on how to figure out device number. All we can
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* really pass to the kernel is what bus and device on which bus we
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* were booted from, which dev_t isn't well suited to since those
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* number don't match to unit numbers very well. We may just need
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* to engage in a hack where we pass -C to the boot args if we are
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* the boot device.
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*/
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major = ACDMAJOR;
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unit = 0; /* XXX */
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/* XXX: Assume partition 'a'. */
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rootdev = MAKEBOOTDEV(major, 0, unit, 0);
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DEBUG("dev is 0x%x\n", rootdev);
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return(rootdev);
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}
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