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bfs_subr.c revision 1.4 
      1 /*	$NetBSD: bfs_subr.c,v 1.4 2019/01/08 17:14:14 christos 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 1.4 2019/01/08 17:14:14 christos 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/param.h>
     42 #include <sys/types.h>
     43 #include <sys/systm.h>
     44 #include <sys/errno.h>
     45 #include <machine/param.h>
     46 #include <machine/sector.h>
     47 #include <machine/bfs.h>
     48 
     49 struct sector_io_ops __io_ops = {
     50 	sector_read,
     51 	sector_read_n,
     52 	sector_write,
     53 	sector_write_n
     54 };
     55 
     56 int
     57 bfs_init(struct bfs **bfsp)
     58 {
     59 	int err, bfs_sector;
     60 
     61 	device_attach(2, 0, -1);	/* HARDDISK UNIT 0 */
     62 
     63 	if ((err = bfs_find(&bfs_sector)) != 0)
     64 		return err;
     65 
     66 	return bfs_init2(bfsp, bfs_sector, &__io_ops, false);
     67 }
     68 
     69 int
     70 bfs_find(int *sector)
     71 {
     72 	static uint8_t buf[DEV_BSIZE];
     73 	struct pdinfo_sector *pdinfo;
     74 	struct vtoc_sector *vtoc;
     75 	const struct ux_partition *bfs_partition;
     76 	int start;
     77 
     78 	/* Physical Disk INFOrmation */
     79 	pdinfo = (struct pdinfo_sector *)buf;
     80 	if (!pdinfo_sector(0, pdinfo) || !pdinfo_sanity(pdinfo))
     81 		return ENOENT;
     82 
     83 	/* `start' is logical sector start in UX partition table. */
     84 	start = pdinfo->logical_sector;
     85 
     86 	/* Volume Table Of Contents */
     87 	vtoc = (struct vtoc_sector *)buf;
     88 	if (!vtoc_sector(0, vtoc, start))
     89 		return ENOENT;
     90 
     91 	/* Boot File System partition */
     92 	if ((bfs_partition = vtoc_find_bfs(vtoc)) == 0)
     93 		return ENOENT;
     94 
     95 	*sector = start + bfs_partition->start_sector;
     96 
     97 	return 0;
     98 }
     99