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      1 /*	$NetBSD: bfs_subr.c,v 1.5 2019/01/08 19:14:51 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 1.5 2019/01/08 19:14:51 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/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 }
     98