xref: /src/sys/arch/i386/stand/lib/biosdisk.c

/*	$NetBSD: biosdisk.c,v 1.1 1997/03/14 02:40:32 perry Exp $	*/

/*
 * Copyright (c) 1996
 *	Matthias Drochner.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed for the NetBSD Project
 *	by Matthias Drochner.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/* raw BIOS disk device for libsa.
 needs lowlevel parts from bios_disk.S and biosdisk_ll.c
 partly from netbsd:sys/arch/i386/boot/disk.c
 no bad144 handling!

 */

/*
 * Ported to boot 386BSD by Julian Elischer (julian (at) tfs.com) Sept 1992
 *
 * Mach Operating System
 * Copyright (c) 1992, 1991 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

#include <sys/types.h>
#include <sys/disklabel.h>

#include <lib/libsa/stand.h>
#include <lib/libsa/saerrno.h>

#include "libi386.h"
#include "biosdisk_ll.h"
/* XXX don't include biosdisk.h for now - vararg prototype */

#define BUFSIZE (1 * BIOSDISK_SECSIZE)

struct biosdisk	{
  struct biosdisk_ll ll;
#ifdef COMPAT_OLDBOOT
  int disktype;
#endif
  int boff;
  char buf[BUFSIZE];
};

int biosdiskstrategy(devdata, flag, dblk, size, buf, rsize)
void	*devdata;
int	flag;
daddr_t	dblk;
size_t	size;
void	*buf;
size_t	*rsize;
{
  struct biosdisk *d;
  int blks, frag;

  if(flag != F_READ) return(EROFS);

  d = (struct biosdisk*)devdata;

  dblk += d->boff;

  blks = size / BIOSDISK_SECSIZE;
  if(blks && readsects(&d->ll, dblk, blks, buf, 0)){
      if(rsize) *rsize = 0;
      return(EIO);
  }

  /* do we really need this? */
  frag = size % BIOSDISK_SECSIZE;
  if(frag) {
      if(readsects(&d->ll, dblk + blks, 1, d->buf, 0)){
	  if(rsize) *rsize = blks * BIOSDISK_SECSIZE;
	  return(EIO);
      }
      bcopy(d->buf, buf + blks * BIOSDISK_SECSIZE, frag);
  }

  if(rsize) *rsize = size;
  return(0);
}

#ifdef COMPAT_OLDBOOT
int biosdisk_gettype(f)
struct open_file *f;
{
    struct biosdisk *d = f->f_devdata;
    return(d->disktype);
}
#endif

int biosdiskopen(f, biosdev, partition)
struct open_file *f;
int biosdev;
unsigned int partition;
{
  struct biosdisk *d;
  struct dos_partition *dptr;
  int sector;
  int error = 0, i;
#ifndef NO_DISKLABEL
  struct disklabel *lp;
#endif

  d = (struct biosdisk*)alloc(sizeof(struct biosdisk));
  if(!d) {
#ifdef DEBUG
      printf("biosdiskopen: no memory\n");
#endif
      return(ENOMEM);
  }

  d->ll.dev = biosdev;
  if(set_geometry(&d->ll)) {
#ifdef DISK_DEBUG
    printf("no geometry information\n");
#endif
    error = ENXIO;
    goto out;
  }

  /* find NetBSD Partition in DOS partition table
   XXX check magic??? */
  if(readsects(&d->ll, 0, 1, d->buf, 0)){
#ifdef DISK_DEBUG
    printf("error reading mbr\n");
#endif
    error = EIO;
    goto out;
  }
  dptr = (struct dos_partition *)&d->buf[DOSPARTOFF];
  sector = -1;
  for (i = 0; i < NDOSPART; i++, dptr++)
    if (dptr->dp_typ == DOSPTYP_NETBSD) {
      sector = dptr->dp_start;
      break;
    }
  if(sector == -1){
#ifdef DISK_DEBUG
    printf("no BSD partition\n");
#endif
    error = EUNLAB; /* ??? */
    goto out;
  }

#ifdef NO_DISKLABEL
  d->boff = sector;
#else
  /* find partition in NetBSD disklabel */
  if(readsects(&d->ll, sector + LABELSECTOR, 1, d->buf, 0)){
#ifdef DISK_DEBUG
    printf("Error reading disklabel\n");
#endif
    error = EIO;
    goto out;
  }
  lp = (struct disklabel *)(d->buf + LABELOFFSET);
  if(lp->d_magic != DISKMAGIC) {
#ifdef DISK_DEBUG
      printf("warning: no disklabel\n");
#endif
      d->boff = sector;
  } else if(partition >= lp->d_npartitions ||
	    lp->d_partitions[partition].p_fstype == FS_UNUSED) {
#ifdef DISK_DEBUG
      printf("illegal partition\n");
#endif
      error = EPART;
      goto out;
  } else {
      d->boff = lp->d_partitions[partition].p_offset;
#ifdef COMPAT_OLDBOOT
      d->disktype = lp->d_type;
#endif
  }
#endif /* NO_DISKLABEL */

#ifdef DISK_DEBUG
  printf("partition @%d\n", d->boff);
#endif

  f->f_devdata = d;
out:
  if(error)
      free(d, sizeof(struct biosdisk));
  return(error);
}

int biosdiskclose(f)
struct open_file *f;
{
  struct biosdisk *d = f->f_devdata;

  if(!(d->ll.dev & 0x80)) /* let the floppy drive go off */
      delay(3000000); /* 2s is enough on all PCs I found */

  free(d, sizeof(struct biosdisk));
  f->f_devdata = NULL;
  return(0);
}

int biosdiskioctl(f, cmd, arg)
struct open_file *f;
u_long cmd;
void *arg;
{
  return EIO;
}