1 /* $NetBSD: blkdev.c,v 1.9 2019/12/27 09:41:48 msaitoh Exp $ */
2
3 /*
4 * Copyright (c) 1999 Christopher G. Demetriou. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by Christopher G. Demetriou
17 * for the NetBSD Project.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1992, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * This code is derived from software contributed to Berkeley by
38 * Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. Neither the name of the University nor the names of its contributors
49 * may be used to endorse or promote products derived from this software
50 * without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * SUCH DAMAGE.
63 *
64 * @(#)rz.c 8.1 (Berkeley) 6/10/93
65 */
66
67 #include <lib/libsa/stand.h>
68 #include <lib/libkern/libkern.h>
69
70 #include <sys/param.h>
71 #include <sys/disklabel.h>
72
73 #include <machine/prom.h>
74
75 #include "stand/common/common.h"
76 #include "blkdev.h"
77
78 #define RF_PROTECTED_SECTORS 64 /* XXX refer to <.../rf_optnames.h> */
79
80
81 /*
82 * If BOOTXX_FS_TYPE is defined, we'll try to find and use the first
83 * partition with that type mentioned in the disklabel, else default to
84 * using block 0.
85 *
86 * The old boot blocks used to look for a file system starting at block
87 * 0. It's not immediately obvious that change here is necessary or good,
88 * so for now we don't bother looking for the specific type.
89 *
90 * However, for filesystem support on RAID1 sets we use a subset of the
91 * BOOTXX_FS_TYPE support.
92 */
93 #if defined(BOOTXX_RAID1_SUPPORT)
94 #define BOOTXX_FS_TYPE
95 #else
96 #undef BOOTXX_FS_TYPE
97 #endif
98
99 int blkdev_is_open;
100 u_int32_t blkdev_part_offset;
101
102 /*
103 * Since we have only one device, and want to squeeze space, we just
104 * short-circuit devopen() to do the disk open as well.
105 *
106 * Devopen is supposed to decode the string 'fname', open the device,
107 * and make 'file' point to the remaining file name. Since we don't
108 * do any device munging, we can just set *file to fname.
109 */
110 int
devopen(struct open_file * f,const char * fname,char ** file)111 devopen(struct open_file *f, const char *fname, char **file)
112 /* file: out */
113 {
114 #if defined(BOOTXX_FS_TYPE)
115 int i;
116 size_t cnt;
117 char *msg, buf[DEV_BSIZE];
118 struct disklabel l;
119 #endif /* defined(BOOTXX_FS_TYPE) */
120
121 if (blkdev_is_open)
122 return (EBUSY);
123
124 *file = (char *)fname;
125
126 #if 0
127 f->f_devdata = NULL; /* no point */
128 #endif
129
130 /* Try to read disk label and partition table information. */
131 blkdev_part_offset = 0;
132 #if defined(BOOTXX_FS_TYPE)
133 i = blkdevstrategy(NULL, F_READ,
134 (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
135 if (i || cnt != DEV_BSIZE) {
136 return (ENXIO);
137 }
138 msg = getdisklabel(buf, &l);
139 if (msg == NULL) {
140 #if defined(BOOTXX_RAID1_SUPPORT)
141 if (l.d_partitions[0].p_fstype == FS_RAID) {
142 blkdev_part_offset = RF_PROTECTED_SECTORS;
143 }
144 #else
145 /*
146 * there's a label. find the first partition of the
147 * type we want and use its offset. if none are
148 * found, we just use offset 0.
149 */
150 for (i = 0; i < l.d_npartitions; i++) {
151 if (l.d_partitions[i].p_fstype == BOOTXX_FS_TYPE) {
152 blkdev_part_offset = l.d_partitions[i].p_offset;
153 break;
154 }
155 }
156 #endif
157 } else {
158 /* just use offset 0; it's already set that way */
159 }
160 #endif /* defined(BOOTXX_FS_TYPE) */
161
162 blkdev_is_open = 1;
163 return (0);
164 }
165
166 int
blkdevstrategy(void * devdata,int rw,daddr_t bn,size_t reqcnt,void * addrvoid,size_t * cnt)167 blkdevstrategy(void *devdata, int rw, daddr_t bn, size_t reqcnt, void *addrvoid, size_t *cnt)
168 /* cnt: out: number of bytes transferred */
169 {
170 char *addr = addrvoid;
171 prom_return_t ret;
172
173 if ((reqcnt & 0xffffff) != reqcnt ||
174 reqcnt == 0)
175 __asm("call_pal 0");
176
177 twiddle();
178
179 /* Partial-block transfers not handled. */
180 if (reqcnt & (DEV_BSIZE - 1)) {
181 *cnt = 0;
182 return (EINVAL);
183 }
184
185 ret.bits = prom_read(booted_dev_fd, reqcnt, addr,
186 bn + blkdev_part_offset);
187 if (ret.u.status)
188 return (EIO);
189 *cnt = ret.u.retval;
190 return (0);
191 }
192
193 #if !defined(LIBSA_NO_FS_CLOSE)
194 int
blkdevclose(struct open_file * f)195 blkdevclose(struct open_file *f)
196 {
197
198 blkdev_is_open = 0;
199 return (0);
200 }
201 #endif /* !defined(LIBSA_NO_FS_CLOSE) */
202