1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Retrieval of the DIMM serial number from data encoded in the SPD and
29 * SEEPROM formats.
30 */
31
32 #include <mem_spd.h>
33 #include <mem_seeprom.h>
34 #include <mem.h>
35
36 #include <fm/fmd_fmri.h>
37
38 #include <stdio.h>
39 #include <fcntl.h>
40 #include <errno.h>
41 #include <unistd.h>
42 #include <strings.h>
43 #include <sys/byteorder.h>
44 #include <sys/stat.h>
45 #include <sys/types.h>
46
47 #define BUFSIZ_SPD 256
48 #define BUFSIZ_SEEPROM 8192
49
50 /*
51 * SEEPROMs are composed of self-describing containers. The first container,
52 * starting at offset 0, is r/w. The second container, starting at 0x1800, is
53 * r/o, and contains identification information supplied by the manufacturer.
54 */
55 #define SEEPROM_OFFSET_RO 0x1800
56
57 static int
mem_get_spd_serid(const char * buf,size_t bufsz,char * serid,size_t seridsz)58 mem_get_spd_serid(const char *buf, size_t bufsz, char *serid, size_t seridsz)
59 {
60 static const char hex_digits[] = "0123456789ABCDEF";
61 spd_data_t *spd = (spd_data_t *)buf;
62 char *c;
63 int i;
64
65 if (bufsz < sizeof (spd_data_t))
66 return (fmd_fmri_set_errno(EINVAL));
67
68 if (seridsz < sizeof (spd->asmb_serial_no) * 2 + 1)
69 return (fmd_fmri_set_errno(EINVAL));
70
71 for (c = serid, i = 0; i < sizeof (spd->asmb_serial_no); i++) {
72 *c++ = hex_digits[spd->asmb_serial_no[i] >> 4];
73 *c++ = hex_digits[spd->asmb_serial_no[i] & 0xf];
74 }
75 *c = '\0';
76
77 return (0);
78 }
79
80 static void *
seeprom_seg_lookup(const char * buf,size_t bufsz,char * segname,size_t * segszp)81 seeprom_seg_lookup(const char *buf, size_t bufsz, char *segname, size_t *segszp)
82 {
83 seeprom_container_t *sc;
84 seeprom_seg_t *segp, seg;
85 int sidx;
86
87 if (strlen(segname) != sizeof (seg.sees_name))
88 return (NULL);
89
90 sc = (seeprom_container_t *)(buf + SEEPROM_OFFSET_RO);
91
92 /* Validate sc size then dereference it */
93 if (bufsz < SEEPROM_OFFSET_RO + sizeof (seeprom_container_t) ||
94 bufsz < SEEPROM_OFFSET_RO + sizeof (seeprom_container_t) +
95 sc->seec_contsz)
96 return (NULL);
97
98 if (sc->seec_tag == 0 || sc->seec_contsz == 0 ||
99 sc->seec_nsegs == 0)
100 return (NULL);
101
102 for (sidx = 0; sidx < sc->seec_nsegs; sidx++) {
103 /* LINTED - pointer alignment */
104 segp = ((seeprom_seg_t *)(sc + 1)) + sidx;
105
106 bcopy(segp, &seg, sizeof (seeprom_seg_t));
107 seg.sees_segoff = ntohs(seg.sees_segoff);
108 seg.sees_seglen = ntohs(seg.sees_seglen);
109
110 if (bufsz < seg.sees_segoff + seg.sees_seglen)
111 return (NULL);
112
113 if (strncmp(segname, seg.sees_name,
114 sizeof (seg.sees_name)) == 0) {
115 *segszp = seg.sees_seglen;
116 return ((void *)(buf + seg.sees_segoff));
117 }
118
119 }
120
121 return (NULL);
122 }
123
124 static int
mem_get_seeprom_serid(const char * buf,size_t bufsz,char * serid,size_t seridsz)125 mem_get_seeprom_serid(const char *buf, size_t bufsz, char *serid,
126 size_t seridsz)
127 {
128 seeprom_seg_sd_t *sd;
129 size_t segsz;
130
131 if (seridsz < sizeof (sd->seesd_sun_sno) + 1)
132 return (fmd_fmri_set_errno(EINVAL));
133
134 if ((sd = seeprom_seg_lookup(buf, bufsz, "SD", &segsz)) == NULL)
135 return (fmd_fmri_set_errno(EINVAL));
136
137 if (segsz < sizeof (seeprom_seg_sd_t))
138 return (fmd_fmri_set_errno(EINVAL));
139
140 bcopy(sd->seesd_sun_sno, serid, sizeof (sd->seesd_sun_sno));
141 serid[sizeof (sd->seesd_sun_sno)] = '\0';
142
143 return (0);
144 }
145
146 int
mem_get_serid(const char * device,char * serid,size_t seridsz)147 mem_get_serid(const char *device, char *serid, size_t seridsz)
148 {
149 char buf[8192];
150 int fd;
151 ssize_t sz;
152
153 if ((fd = open(device, O_RDONLY)) < 0)
154 return (-1); /* errno is set for us */
155
156 if ((sz = read(fd, buf, sizeof (buf))) < 0) {
157 int err = errno;
158 (void) close(fd);
159 return (fmd_fmri_set_errno(err));
160 }
161
162 (void) close(fd);
163
164 switch (sz) {
165 case BUFSIZ_SPD:
166 return (mem_get_spd_serid(buf, BUFSIZ_SPD, serid, seridsz));
167 case BUFSIZ_SEEPROM:
168 return (mem_get_seeprom_serid(buf, BUFSIZ_SEEPROM, serid,
169 seridsz));
170 default:
171 return (fmd_fmri_set_errno(EINVAL));
172 }
173 }
174