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 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * Retrieval of the DIMM serial number from data encoded in the SPD and
31 * SEEPROM formats.
32 */
33
34 #include <mem_spd.h>
35 #include <mem_seeprom.h>
36 #include <mem.h>
37
38 #include <fm/fmd_fmri.h>
39
40 #include <stdio.h>
41 #include <fcntl.h>
42 #include <errno.h>
43 #include <unistd.h>
44 #include <strings.h>
45 #include <sys/byteorder.h>
46 #include <sys/stat.h>
47 #include <sys/types.h>
48
49 #define BUFSIZ_SPD 256
50 #define BUFSIZ_SEEPROM 8192
51
52 /*
53 * SEEPROMs are composed of self-describing containers. The first container,
54 * starting at offset 0, is r/w. The second container, starting at 0x1800, is
55 * r/o, and contains identification information supplied by the manufacturer.
56 */
57 #define SEEPROM_OFFSET_RO 0x1800
58
59 static int
mem_get_spd_serid(const char * buf,size_t bufsz,char * serid,size_t seridsz)60 mem_get_spd_serid(const char *buf, size_t bufsz, char *serid, size_t seridsz)
61 {
62 static const char hex_digits[] = "0123456789ABCDEF";
63 spd_data_t *spd = (spd_data_t *)buf;
64 char *c;
65 int i;
66
67 if (bufsz < sizeof (spd_data_t))
68 return (fmd_fmri_set_errno(EINVAL));
69
70 if (seridsz < sizeof (spd->asmb_serial_no) * 2 + 1)
71 return (fmd_fmri_set_errno(EINVAL));
72
73 for (c = serid, i = 0; i < sizeof (spd->asmb_serial_no); i++) {
74 *c++ = hex_digits[spd->asmb_serial_no[i] >> 4];
75 *c++ = hex_digits[spd->asmb_serial_no[i] & 0xf];
76 }
77 *c = '\0';
78
79 return (0);
80 }
81
82 static void *
seeprom_seg_lookup(const char * buf,size_t bufsz,char * segname,size_t * segszp)83 seeprom_seg_lookup(const char *buf, size_t bufsz, char *segname, size_t *segszp)
84 {
85 seeprom_container_t *sc;
86 seeprom_seg_t *segp, seg;
87 int sidx;
88
89 if (strlen(segname) != sizeof (seg.sees_name))
90 return (NULL);
91
92 sc = (seeprom_container_t *)(buf + SEEPROM_OFFSET_RO);
93
94 /* Validate sc size then dereference it */
95 if (bufsz < SEEPROM_OFFSET_RO + sizeof (seeprom_container_t) ||
96 bufsz < SEEPROM_OFFSET_RO + sizeof (seeprom_container_t) +
97 sc->seec_contsz)
98 return (NULL);
99
100 if (sc->seec_tag == 0 || sc->seec_contsz == 0 ||
101 sc->seec_nsegs == 0)
102 return (NULL);
103
104 for (sidx = 0; sidx < sc->seec_nsegs; sidx++) {
105 /* LINTED - pointer alignment */
106 segp = ((seeprom_seg_t *)(sc + 1)) + sidx;
107
108 bcopy(segp, &seg, sizeof (seeprom_seg_t));
109 seg.sees_segoff = ntohs(seg.sees_segoff);
110 seg.sees_seglen = ntohs(seg.sees_seglen);
111
112 if (bufsz < seg.sees_segoff + seg.sees_seglen)
113 return (NULL);
114
115 if (strncmp(segname, seg.sees_name,
116 sizeof (seg.sees_name)) == 0) {
117 *segszp = seg.sees_seglen;
118 return ((void *)(buf + seg.sees_segoff));
119 }
120
121 }
122
123 return (NULL);
124 }
125
126 static int
mem_get_seeprom_serid(const char * buf,size_t bufsz,char * serid,size_t seridsz)127 mem_get_seeprom_serid(const char *buf, size_t bufsz, char *serid,
128 size_t seridsz)
129 {
130 seeprom_seg_sd_t *sd;
131 size_t segsz;
132
133 if (seridsz < sizeof (sd->seesd_sun_sno) + 1)
134 return (fmd_fmri_set_errno(EINVAL));
135
136 if ((sd = seeprom_seg_lookup(buf, bufsz, "SD", &segsz)) == NULL)
137 return (fmd_fmri_set_errno(EINVAL));
138
139 if (segsz < sizeof (seeprom_seg_sd_t))
140 return (fmd_fmri_set_errno(EINVAL));
141
142 bcopy(sd->seesd_sun_sno, serid, sizeof (sd->seesd_sun_sno));
143 serid[sizeof (sd->seesd_sun_sno)] = '\0';
144
145 return (0);
146 }
147
148 int
mem_get_serid(const char * device,char * serid,size_t seridsz)149 mem_get_serid(const char *device, char *serid, size_t seridsz)
150 {
151 char buf[8192];
152 int fd;
153 ssize_t sz;
154
155 if ((fd = open(device, O_RDONLY)) < 0)
156 return (-1); /* errno is set for us */
157
158 if ((sz = read(fd, buf, sizeof (buf))) < 0) {
159 int err = errno;
160 (void) close(fd);
161 return (fmd_fmri_set_errno(err));
162 }
163
164 (void) close(fd);
165
166 switch (sz) {
167 case BUFSIZ_SPD:
168 return (mem_get_spd_serid(buf, BUFSIZ_SPD, serid, seridsz));
169 case BUFSIZ_SEEPROM:
170 return (mem_get_seeprom_serid(buf, BUFSIZ_SEEPROM, serid,
171 seridsz));
172 default:
173 return (fmd_fmri_set_errno(EINVAL));
174 }
175 }
176