1 /*-
2 * Copyright (c) 2003 Jake Burkholder
3 * Copyright (c) 2003 Poul-Henning Kamp
4 * Copyright (c) 2004,2005 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: src/sys/geom/geom_sunlabel_enc.c,v 1.6 2005/03/30 09:33:09 joerg Exp $");
36
37 #include <sys/types.h>
38 #include <sys/endian.h>
39 #include <sys/errno.h>
40 #include <sys/sun_disklabel.h>
41 #ifdef _KERNEL
42 #include <sys/systm.h>
43 #else
44 #include <string.h>
45 #endif
46
47 #define SL_TEXT 0x0
48 #define SL_TEXT_SIZEOF 0x80
49 #define SL_VTOC_VERS 0x80
50 #define SL_VTOC_VOLNAME 0x84
51 #define SL_VTOC_NPART 0x8c
52 #define SL_VTOC_MAP 0x8e
53 #define SL_VTOC_SANITY 0xbc
54 #define SL_RPM 0x1a4
55 #define SL_PCYLINDERS 0x1a6
56 #define SL_SPARESPERCYL 0x1a8
57 #define SL_INTERLEAVE 0x1ae
58 #define SL_NCYLINDERS 0x1b0
59 #define SL_ACYLINDERS 0x1b2
60 #define SL_NTRACKS 0x1b4
61 #define SL_NSECTORS 0x1b6
62 #define SL_PART 0x1bc
63 #define SL_MAGIC 0x1fc
64 #define SL_CKSUM 0x1fe
65
66 #define SDKP_CYLOFFSET 0
67 #define SDKP_NSECTORS 0x4
68 #define SDKP_SIZEOF 0x8 /* size of a partition entry */
69
70 #define SVTOC_TAG 0
71 #define SVTOC_FLAG 0x2
72 #define SVTOC_SIZEOF 0x4 /* size of a VTOC tag/flag entry */
73
74 /*
75 * Decode the relevant fields of a sun disk label, and return zero if the
76 * magic and checksum works out OK.
77 */
78 int
79 sunlabel_dec(void const *pp, struct sun_disklabel *sl)
80 {
81 const uint8_t *p;
82 size_t i;
83 u_int u;
84 uint32_t vtocsane;
85 uint16_t npart;
86
87 p = pp;
88 for (i = 0; i < sizeof(sl->sl_text); i++)
89 sl->sl_text[i] = p[SL_TEXT + i];
90 sl->sl_rpm = be16dec(p + SL_RPM);
91 sl->sl_pcylinders = be16dec(p + SL_PCYLINDERS);
92 sl->sl_sparespercyl = be16dec(p + SL_SPARESPERCYL);
93 sl->sl_interleave = be16dec(p + SL_INTERLEAVE);
94 sl->sl_ncylinders = be16dec(p + SL_NCYLINDERS);
95 sl->sl_acylinders = be16dec(p + SL_ACYLINDERS);
96 sl->sl_ntracks = be16dec(p + SL_NTRACKS);
97 sl->sl_nsectors = be16dec(p + SL_NSECTORS);
98 for (i = 0; i < SUN_NPART; i++) {
99 sl->sl_part[i].sdkp_cyloffset = be32dec(p + SL_PART +
100 (i * SDKP_SIZEOF) + SDKP_CYLOFFSET);
101 sl->sl_part[i].sdkp_nsectors = be32dec(p + SL_PART +
102 (i * SDKP_SIZEOF) + SDKP_NSECTORS);
103 }
104 sl->sl_magic = be16dec(p + SL_MAGIC);
105 vtocsane = be32dec(p + SL_VTOC_SANITY);
106 npart = be16dec(p + SL_VTOC_NPART);
107 if (vtocsane == SUN_VTOC_SANE && npart == SUN_NPART) {
108 /*
109 * Seems we've got SVR4-compatible VTOC information
110 * as well, decode it.
111 */
112 sl->sl_vtoc_sane = vtocsane;
113 sl->sl_vtoc_vers = be32dec(p + SL_VTOC_VERS);
114 memcpy(sl->sl_vtoc_volname, p + SL_VTOC_VOLNAME,
115 SUN_VOLNAME_LEN);
116 sl->sl_vtoc_nparts = SUN_NPART;
117 for (i = 0; i < SUN_NPART; i++) {
118 sl->sl_vtoc_map[i].svtoc_tag = be16dec(p +
119 SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_TAG);
120 sl->sl_vtoc_map[i].svtoc_flag = be16dec(p +
121 SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_FLAG);
122 }
123 }
124 for (i = u = 0; i < SUN_SIZE; i += 2)
125 u ^= be16dec(p + i);
126 if (u == 0 && sl->sl_magic == SUN_DKMAGIC)
127 return (0);
128 else
129 return (EINVAL);
130 }
131
132 /*
133 * Encode the relevant fields into a sun disklabel, compute new checksum.
134 */
135 void
136 sunlabel_enc(void *pp, struct sun_disklabel *sl)
137 {
138 uint8_t *p;
139 size_t i;
140 u_int u;
141
142 p = pp;
143 for (i = 0; i < SL_TEXT_SIZEOF; i++)
144 p[SL_TEXT + i] = sl->sl_text[i];
145 be16enc(p + SL_RPM, sl->sl_rpm);
146 be16enc(p + SL_PCYLINDERS, sl->sl_pcylinders);
147 be16enc(p + SL_SPARESPERCYL, sl->sl_sparespercyl);
148 be16enc(p + SL_INTERLEAVE, sl->sl_interleave);
149 be16enc(p + SL_NCYLINDERS, sl->sl_ncylinders);
150 be16enc(p + SL_ACYLINDERS, sl->sl_acylinders);
151 be16enc(p + SL_NTRACKS, sl->sl_ntracks);
152 be16enc(p + SL_NSECTORS, sl->sl_nsectors);
153 for (i = 0; i < SUN_NPART; i++) {
154 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_CYLOFFSET,
155 sl->sl_part[i].sdkp_cyloffset);
156 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_NSECTORS,
157 sl->sl_part[i].sdkp_nsectors);
158 }
159 be16enc(p + SL_MAGIC, sl->sl_magic);
160 if (sl->sl_vtoc_sane == SUN_VTOC_SANE
161 && sl->sl_vtoc_nparts == SUN_NPART) {
162 /*
163 * Write SVR4-compatible VTOC elements.
164 */
165 be32enc(p + SL_VTOC_VERS, sl->sl_vtoc_vers);
166 be32enc(p + SL_VTOC_SANITY, SUN_VTOC_SANE);
167 memcpy(p + SL_VTOC_VOLNAME, sl->sl_vtoc_volname,
168 SUN_VOLNAME_LEN);
169 be16enc(p + SL_VTOC_NPART, SUN_NPART);
170 for (i = 0; i < SUN_NPART; i++) {
171 be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
172 + SVTOC_TAG,
173 sl->sl_vtoc_map[i].svtoc_tag);
174 be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
175 + SVTOC_FLAG,
176 sl->sl_vtoc_map[i].svtoc_flag);
177 }
178 }
179 for (i = u = 0; i < SUN_SIZE; i += 2)
180 u ^= be16dec(p + i);
181 be16enc(p + SL_CKSUM, u);
182 }
183
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