1 /*-
2 * Copyright (c) 2003 Jake Burkholder
3 * Copyright (c) 2003 Poul-Henning Kamp
4 * Copyright (c) 2004 Joerg Wunsch
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * Functions to encode or decode struct sun_disklabel into a bytestream
29 * of correct endianess and packing.
30 *
31 * NB! This file must be usable both in kernel and userland.
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: releng/5.3/sys/geom/geom_sunlabel_enc.c 136588 2004-10-16 08:43:07Z cvs2svn $");
36
37 #include <sys/types.h>
38 #include <sys/endian.h>
39 #include <sys/errno.h>
40 #include <sys/sun_disklabel.h>
41
42 #define SL_TEXT 0x0
43 #define SL_TEXT_SIZEOF 0x80
44 #define SL_VTOC_VERS 0x80
45 #define SL_VTOC_NPART 0x8c
46 #define SL_VTOC_MAP 0x8e
47 #define SL_VTOC_SANITY 0xbc
48 #define SL_RPM 0x1a4
49 #define SL_PCYLINDERS 0x1a6
50 #define SL_SPARESPERCYL 0x1a8
51 #define SL_INTERLEAVE 0x1ae
52 #define SL_NCYLINDERS 0x1b0
53 #define SL_ACYLINDERS 0x1b2
54 #define SL_NTRACKS 0x1b4
55 #define SL_NSECTORS 0x1b6
56 #define SL_PART 0x1bc
57 #define SL_MAGIC 0x1fc
58 #define SL_CKSUM 0x1fe
59
60 #define SDKP_CYLOFFSET 0
61 #define SDKP_NSECTORS 0x4
62 #define SDKP_SIZEOF 0x8 /* size of a partition entry */
63
64 #define SVTOC_TAG 0
65 #define SVTOC_FLAG 0x2
66 #define SVTOC_SIZEOF 0x4 /* size of a VTOC tag/flag entry */
67
68 /*
69 * Decode the relevant fields of a sun disk label, and return zero if the
70 * magic and checksum works out OK.
71 */
72 int
73 sunlabel_dec(void const *pp, struct sun_disklabel *sl)
74 {
75 const uint8_t *p;
76 size_t i;
77 u_int u;
78 uint32_t vtocsane;
79 uint16_t npart;
80
81 p = pp;
82 for (i = 0; i < sizeof(sl->sl_text); i++)
83 sl->sl_text[i] = p[SL_TEXT + i];
84 sl->sl_rpm = be16dec(p + SL_RPM);
85 sl->sl_pcylinders = be16dec(p + SL_PCYLINDERS);
86 sl->sl_sparespercyl = be16dec(p + SL_SPARESPERCYL);
87 sl->sl_interleave = be16dec(p + SL_INTERLEAVE);
88 sl->sl_ncylinders = be16dec(p + SL_NCYLINDERS);
89 sl->sl_acylinders = be16dec(p + SL_ACYLINDERS);
90 sl->sl_ntracks = be16dec(p + SL_NTRACKS);
91 sl->sl_nsectors = be16dec(p + SL_NSECTORS);
92 for (i = 0; i < SUN_NPART; i++) {
93 sl->sl_part[i].sdkp_cyloffset = be32dec(p + SL_PART +
94 (i * SDKP_SIZEOF) + SDKP_CYLOFFSET);
95 sl->sl_part[i].sdkp_nsectors = be32dec(p + SL_PART +
96 (i * SDKP_SIZEOF) + SDKP_NSECTORS);
97 }
98 sl->sl_magic = be16dec(p + SL_MAGIC);
99 vtocsane = be32dec(p + SL_VTOC_SANITY);
100 npart = be16dec(p + SL_VTOC_NPART);
101 if (vtocsane == SUN_VTOC_SANE && npart == SUN_NPART) {
102 /*
103 * Seems we've got SVR4-compatible VTOC information
104 * as well, decode it.
105 */
106 sl->sl_vtoc_sane = vtocsane;
107 sl->sl_vtoc_vers = be32dec(p + SL_VTOC_VERS);
108 sl->sl_vtoc_nparts = SUN_NPART;
109 for (i = 0; i < SUN_NPART; i++) {
110 sl->sl_vtoc_map[i].svtoc_tag = be16dec(p +
111 SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_TAG);
112 sl->sl_vtoc_map[i].svtoc_flag = be16dec(p +
113 SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_FLAG);
114 }
115 }
116 for (i = u = 0; i < SUN_SIZE; i += 2)
117 u ^= be16dec(p + i);
118 if (u == 0 && sl->sl_magic == SUN_DKMAGIC)
119 return (0);
120 else
121 return (EINVAL);
122 }
123
124 /*
125 * Encode the relevant fields into a sun disklabel, compute new checksum.
126 */
127 void
128 sunlabel_enc(void *pp, struct sun_disklabel *sl)
129 {
130 uint8_t *p;
131 size_t i;
132 u_int u;
133
134 p = pp;
135 for (i = 0; i < SL_TEXT_SIZEOF; i++)
136 p[SL_TEXT + i] = sl->sl_text[i];
137 be16enc(p + SL_RPM, sl->sl_rpm);
138 be16enc(p + SL_PCYLINDERS, sl->sl_pcylinders);
139 be16enc(p + SL_SPARESPERCYL, sl->sl_sparespercyl);
140 be16enc(p + SL_INTERLEAVE, sl->sl_interleave);
141 be16enc(p + SL_NCYLINDERS, sl->sl_ncylinders);
142 be16enc(p + SL_ACYLINDERS, sl->sl_acylinders);
143 be16enc(p + SL_NTRACKS, sl->sl_ntracks);
144 be16enc(p + SL_NSECTORS, sl->sl_nsectors);
145 for (i = 0; i < SUN_NPART; i++) {
146 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_CYLOFFSET,
147 sl->sl_part[i].sdkp_cyloffset);
148 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_NSECTORS,
149 sl->sl_part[i].sdkp_nsectors);
150 }
151 be16enc(p + SL_MAGIC, sl->sl_magic);
152 if (sl->sl_vtoc_sane == SUN_VTOC_SANE
153 && sl->sl_vtoc_nparts == SUN_NPART) {
154 /*
155 * Write SVR4-compatible VTOC elements.
156 */
157 be32enc(p + SL_VTOC_VERS, sl->sl_vtoc_vers);
158 be32enc(p + SL_VTOC_SANITY, SUN_VTOC_SANE);
159 be16enc(p + SL_VTOC_NPART, SUN_NPART);
160 for (i = 0; i < SUN_NPART; i++) {
161 be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
162 + SVTOC_TAG,
163 sl->sl_vtoc_map[i].svtoc_tag);
164 be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
165 + SVTOC_FLAG,
166 sl->sl_vtoc_map[i].svtoc_flag);
167 }
168 }
169 for (i = u = 0; i < SUN_SIZE; i += 2)
170 u ^= be16dec(p + i);
171 be16enc(p + SL_CKSUM, u);
172 }
Cache object: e9dab10e693fbe8c90513a674bb54620
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