sys/arch/ews4800mips/stand/common/bfs_subr.c

   1 /*      $NetBSD: bfs_subr.c,v 1.2 2007/02/22 05:31:53 thorpej Exp $     */
   2
   3 /*-
   4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by UCHIYAMA Yasushi.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33
  34 __KERNEL_RCSID(0, "$NetBSD: bfs_subr.c,v 1.2 2007/02/22 05:31:53 thorpej Exp $");
  35 #ifdef _STANDALONE
  36 #include <lib/libsa/stand.h>
  37 #include <lib/libkern/libkern.h>
  38 #include "local.h"
  39 #endif
  40
  41 #include <sys/types.h>
  42 #include <sys/systm.h>
  43 #include <sys/errno.h>
  44 #include <machine/param.h>
  45 #include <machine/sector.h>
  46 #include <machine/bfs.h>
  47
  48 struct sector_io_ops __io_ops = {
  49         sector_read,
  50         sector_read_n,
  51         sector_write,
  52         sector_write_n
  53 };
  54
  55 int
  56 bfs_init(struct bfs **bfsp)
  57 {
  58         int err, bfs_sector;
  59
  60         device_attach(2, 0, -1);        /* HARDDISK UNIT 0 */
  61
  62         if ((err = bfs_find(&bfs_sector)) != 0)
  63                 return err;
  64
  65         return bfs_init2(bfsp, bfs_sector, &__io_ops, false);
  66 }
  67
  68 int
  69 bfs_find(int *sector)
  70 {
  71         static uint8_t buf[DEV_BSIZE];
  72         struct pdinfo_sector *pdinfo;
  73         struct vtoc_sector *vtoc;
  74         const struct ux_partition *bfs_partition;
  75         int start;
  76
  77         /* Physical Disk INFOrmation */
  78         pdinfo = (struct pdinfo_sector *)buf;
  79         if (!pdinfo_sector(0, pdinfo) || !pdinfo_sanity(pdinfo))
  80                 return ENOENT;
  81
  82         /* `start' is logical sector start in UX partition table. */
  83         start = pdinfo->logical_sector;
  84
  85         /* Volume Table Of Contents */
  86         vtoc = (struct vtoc_sector *)buf;
  87         if (!vtoc_sector(0, vtoc, start))
  88                 return ENOENT;
  89
  90         /* Boot File System partition */
  91         if ((bfs_partition = vtoc_find_bfs(vtoc)) == 0)
  92                 return ENOENT;
  93
  94         *sector = start + bfs_partition->start_sector;
  95
  96         return 0;
  97 }