1/*	$NetBSD: sector.c,v 1.6 2008/01/02 11:48:24 ad 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__KERNEL_RCSID(0, "$NetBSD: sector.c,v 1.6 2008/01/02 11:48:24 ad Exp $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/buf.h>
38#include <machine/sector.h>
39
40struct sector_rw {
41	struct buf *buf;
42	void (*strategy)(struct buf *);
43	bool busy;
44} __context;
45
46void *
47sector_init(dev_t dev, void (*strat)(struct buf *))
48{
49	struct sector_rw *rw =& __context;
50
51	if (rw->busy)
52		return 0;
53	rw->busy = true;
54	rw->strategy = strat;
55	rw->buf = geteblk(DEV_BSIZE);
56	rw->buf->b_dev = dev;
57
58	return rw;
59}
60
61void
62sector_fini(void *self)
63{
64	struct sector_rw *rw = self;
65
66	brelse(rw->buf, 0);
67	rw->busy = false;
68}
69
70bool
71sector_read_n(void *self, uint8_t *buf, daddr_t sector, int count)
72{
73	int i;
74
75	for (i = 0; i < count; i++) {
76		if (!sector_read(self, buf, sector))
77			return false;
78		buf += DEV_BSIZE;
79		sector++;
80	}
81
82	return true;
83}
84
85bool
86sector_read(void *self, uint8_t *buf, daddr_t sector)
87{
88	struct sector_rw *rw = self;
89	struct buf *b = rw->buf;
90
91	b->b_blkno = sector;
92	b->b_cylinder = sector / 100;
93	b->b_bcount = DEV_BSIZE;
94	b->b_oflags &= ~(BO_DONE);
95	b->b_flags |= B_READ;
96	rw->strategy(b);
97
98	if (biowait(b) != 0)
99		return false;
100
101	memcpy(buf, b->b_data, DEV_BSIZE);
102
103	return true;
104}
105
106bool
107sector_write_n(void *self, uint8_t *buf, daddr_t sector, int count)
108{
109	int i;
110
111	for (i = 0; i < count; i++) {
112		if (!sector_write(self, buf, sector))
113			return false;
114		buf += DEV_BSIZE;
115		sector++;
116	}
117
118	return true;
119}
120
121bool
122sector_write(void *self, uint8_t *buf, daddr_t sector)
123{
124	struct sector_rw *rw = self;
125	struct buf *b = rw->buf;
126
127	b->b_blkno = sector;
128	b->b_cylinder = sector / 100;
129	b->b_bcount = DEV_BSIZE;
130	b->b_flags &= ~(B_READ);
131	b->b_oflags &= ~(BO_DONE);
132	b->b_flags |= B_WRITE;
133	memcpy(b->b_data, buf, DEV_BSIZE);
134	rw->strategy(b);
135
136	if (biowait(b) != 0)
137		return false;
138
139	return true;
140}
141