1 /*-
2 * Copyright (c) 2003 Jake Burkholder
3 * Copyright (c) 2003 Poul-Henning Kamp
4 * 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 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: releng/5.1/sys/geom/geom_sunlabel_enc.c 113818 2003-04-21 19:42:36Z phk $
28 *
29 * Functions to encode or decode struct sun_disklabel into a bytestream
30 * of correct endianess and packing.
31 *
32 * NB! This file must be usable both in kernel and userland.
33 *
34 */
35
36 #include <sys/types.h>
37 #include <sys/endian.h>
38 #include <sys/errno.h>
39 #include <sys/sun_disklabel.h>
40
41 #define SL_TEXT 0x0
42 #define SL_TEXT_SIZEOF 0x80
43 #define SL_RPM 0x1a4
44 #define SL_PCYLINDERS 0x1a6
45 #define SL_SPARESPERCYL 0x1a8
46 #define SL_INTERLEAVE 0x1ae
47 #define SL_NCYLINDERS 0x1b0
48 #define SL_ACYLINDERS 0x1b2
49 #define SL_NTRACKS 0x1b4
50 #define SL_NSECTORS 0x1b6
51 #define SL_PART 0x1bc
52 #define SL_MAGIC 0x1fc
53 #define SL_CKSUM 0x1fe
54
55 #define SDKP_CYLOFFSET 0
56 #define SDKP_NSECTORS 0x4
57 #define SDKP_SIZEOF 0x8
58
59 /*
60 * Decode the relevant fields of a sun disk label, and return zero if the
61 * magic and checksum works out OK.
62 */
63 int
64 sunlabel_dec(void const *pp, struct sun_disklabel *sl)
65 {
66 const uint8_t *p;
67 size_t i;
68 u_int u;
69
70 p = pp;
71 for (i = 0; i < sizeof(sl->sl_text); i++)
72 sl->sl_text[i] = p[SL_TEXT + i];
73 sl->sl_rpm = be16dec(p + SL_RPM);
74 sl->sl_pcylinders = be16dec(p + SL_PCYLINDERS);
75 sl->sl_sparespercyl = be16dec(p + SL_SPARESPERCYL);
76 sl->sl_interleave = be16dec(p + SL_INTERLEAVE);
77 sl->sl_ncylinders = be16dec(p + SL_NCYLINDERS);
78 sl->sl_acylinders = be16dec(p + SL_ACYLINDERS);
79 sl->sl_ntracks = be16dec(p + SL_NTRACKS);
80 sl->sl_nsectors = be16dec(p + SL_NSECTORS);
81 for (i = 0; i < SUN_NPART; i++) {
82 sl->sl_part[i].sdkp_cyloffset = be32dec(p + SL_PART +
83 (i * SDKP_SIZEOF) + SDKP_CYLOFFSET);
84 sl->sl_part[i].sdkp_nsectors = be32dec(p + SL_PART +
85 (i * SDKP_SIZEOF) + SDKP_NSECTORS);
86 }
87 sl->sl_magic = be16dec(p + SL_MAGIC);
88 for (i = u = 0; i < SUN_SIZE; i += 2)
89 u ^= be16dec(p + i);
90 if (u == 0 && sl->sl_magic == SUN_DKMAGIC)
91 return (0);
92 else
93 return (EINVAL);
94 }
95
96 /*
97 * Encode the relevant fields into a sun disklabel, compute new checksum.
98 */
99 void
100 sunlabel_enc(void *pp, struct sun_disklabel *sl)
101 {
102 uint8_t *p;
103 size_t i;
104 u_int u;
105
106 p = pp;
107 for (i = 0; i < SL_TEXT_SIZEOF; i++)
108 p[SL_TEXT + i] = sl->sl_text[i];
109 be16enc(p + SL_RPM, sl->sl_rpm);
110 be16enc(p + SL_PCYLINDERS, sl->sl_pcylinders);
111 be16enc(p + SL_SPARESPERCYL, sl->sl_sparespercyl);
112 be16enc(p + SL_INTERLEAVE, sl->sl_interleave);
113 be16enc(p + SL_NCYLINDERS, sl->sl_ncylinders);
114 be16enc(p + SL_ACYLINDERS, sl->sl_acylinders);
115 be16enc(p + SL_NTRACKS, sl->sl_ntracks);
116 be16enc(p + SL_NSECTORS, sl->sl_nsectors);
117 for (i = 0; i < SUN_NPART; i++) {
118 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_CYLOFFSET,
119 sl->sl_part[i].sdkp_cyloffset);
120 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_NSECTORS,
121 sl->sl_part[i].sdkp_nsectors);
122 }
123 be16enc(p + SL_MAGIC, sl->sl_magic);
124 for (i = u = 0; i < SUN_SIZE; i += 2)
125 u ^= be16dec(p + i);
126 be16enc(p + SL_CKSUM, u);
127 }
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