1 /* $NetBSD: sector.c,v 1.7 2008/04/28 20:23:18 martin 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 1.7 2008/04/28 20:23:18 martin Exp $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/buf.h>
38 #include <machine/sector.h>
39
40 struct sector_rw {
41 struct buf *buf;
42 void (*strategy)(struct buf *);
43 bool busy;
44 } __context;
45
46 void *
sector_init(dev_t dev,void (* strat)(struct buf *))47 sector_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
61 void
sector_fini(void * self)62 sector_fini(void *self)
63 {
64 struct sector_rw *rw = self;
65
66 brelse(rw->buf, 0);
67 rw->busy = false;
68 }
69
70 bool
sector_read_n(void * self,uint8_t * buf,daddr_t sector,int count)71 sector_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
85 bool
sector_read(void * self,uint8_t * buf,daddr_t sector)86 sector_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
106 bool
sector_write_n(void * self,uint8_t * buf,daddr_t sector,int count)107 sector_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
121 bool
sector_write(void * self,uint8_t * buf,daddr_t sector)122 sector_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