xref: /illumos-kvm-cmd/hw/smbios.c (revision 68396ea9)
1 /*
2  * SMBIOS Support
3  *
4  * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
5  *
6  * Authors:
7  *  Alex Williamson <alex.williamson@hp.com>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2.  See
10  * the COPYING file in the top-level directory.
11  *
12  */
13 
14 #include "sysemu.h"
15 #include "smbios.h"
16 #include "loader.h"
17 
18 /*
19  * Structures shared with the BIOS
20  */
21 struct smbios_header {
22     uint16_t length;
23     uint8_t type;
24 } __attribute__((__packed__));
25 
26 struct smbios_field {
27     struct smbios_header header;
28     uint8_t type;
29     uint16_t offset;
30     uint8_t data[];
31 } __attribute__((__packed__));
32 
33 struct smbios_table {
34     struct smbios_header header;
35     uint8_t data[];
36 } __attribute__((__packed__));
37 
38 #define SMBIOS_FIELD_ENTRY 0
39 #define SMBIOS_TABLE_ENTRY 1
40 
41 
42 static uint8_t *smbios_entries;
43 static size_t smbios_entries_len;
44 static int smbios_type4_count = 0;
45 
smbios_validate_table(void)46 static void smbios_validate_table(void)
47 {
48     if (smbios_type4_count && smbios_type4_count != smp_cpus) {
49          fprintf(stderr,
50                  "Number of SMBIOS Type 4 tables must match cpu count.\n");
51         exit(1);
52     }
53 }
54 
smbios_get_table(size_t * length)55 uint8_t *smbios_get_table(size_t *length)
56 {
57     smbios_validate_table();
58     *length = smbios_entries_len;
59     return smbios_entries;
60 }
61 
62 /*
63  * To avoid unresolvable overlaps in data, don't allow both
64  * tables and fields for the same smbios type.
65  */
smbios_check_collision(int type,int entry)66 static void smbios_check_collision(int type, int entry)
67 {
68     uint16_t *num_entries = (uint16_t *)smbios_entries;
69     struct smbios_header *header;
70     char *p;
71     int i;
72 
73     if (!num_entries)
74         return;
75 
76     p = (char *)(num_entries + 1);
77 
78     for (i = 0; i < *num_entries; i++) {
79         header = (struct smbios_header *)p;
80         if (entry == SMBIOS_TABLE_ENTRY && header->type == SMBIOS_FIELD_ENTRY) {
81             struct smbios_field *field = (void *)header;
82             if (type == field->type) {
83                 fprintf(stderr, "SMBIOS type %d field already defined, "
84                                 "cannot add table\n", type);
85                 exit(1);
86             }
87         } else if (entry == SMBIOS_FIELD_ENTRY &&
88                    header->type == SMBIOS_TABLE_ENTRY) {
89             struct smbios_structure_header *table = (void *)(header + 1);
90             if (type == table->type) {
91                 fprintf(stderr, "SMBIOS type %d table already defined, "
92                                 "cannot add field\n", type);
93                 exit(1);
94             }
95         }
96         p += le16_to_cpu(header->length);
97     }
98 }
99 
smbios_add_field(int type,int offset,int len,void * data)100 void smbios_add_field(int type, int offset, int len, void *data)
101 {
102     struct smbios_field *field;
103 
104     smbios_check_collision(type, SMBIOS_FIELD_ENTRY);
105 
106     if (!smbios_entries) {
107         smbios_entries_len = sizeof(uint16_t);
108         smbios_entries = qemu_mallocz(smbios_entries_len);
109     }
110     smbios_entries = qemu_realloc(smbios_entries, smbios_entries_len +
111                                                   sizeof(*field) + len);
112     field = (struct smbios_field *)(smbios_entries + smbios_entries_len);
113     field->header.type = SMBIOS_FIELD_ENTRY;
114     field->header.length = cpu_to_le16(sizeof(*field) + len);
115 
116     field->type = type;
117     field->offset = cpu_to_le16(offset);
118     memcpy(field->data, data, len);
119 
120     smbios_entries_len += sizeof(*field) + len;
121     (*(uint16_t *)smbios_entries) =
122             cpu_to_le16(le16_to_cpu(*(uint16_t *)smbios_entries) + 1);
123 }
124 
smbios_build_type_0_fields(const char * t)125 static void smbios_build_type_0_fields(const char *t)
126 {
127     char buf[1024];
128 
129     if (get_param_value(buf, sizeof(buf), "vendor", t))
130         smbios_add_field(0, offsetof(struct smbios_type_0, vendor_str),
131                          strlen(buf) + 1, buf);
132     if (get_param_value(buf, sizeof(buf), "version", t))
133         smbios_add_field(0, offsetof(struct smbios_type_0, bios_version_str),
134                          strlen(buf) + 1, buf);
135     if (get_param_value(buf, sizeof(buf), "date", t))
136         smbios_add_field(0, offsetof(struct smbios_type_0,
137                                      bios_release_date_str),
138                                      strlen(buf) + 1, buf);
139     if (get_param_value(buf, sizeof(buf), "release", t)) {
140         int major, minor;
141         sscanf(buf, "%d.%d", &major, &minor);
142         smbios_add_field(0, offsetof(struct smbios_type_0,
143                                      system_bios_major_release), 1, &major);
144         smbios_add_field(0, offsetof(struct smbios_type_0,
145                                      system_bios_minor_release), 1, &minor);
146     }
147 }
148 
smbios_build_type_1_fields(const char * t)149 static void smbios_build_type_1_fields(const char *t)
150 {
151     char buf[1024];
152 
153     if (get_param_value(buf, sizeof(buf), "manufacturer", t))
154         smbios_add_field(1, offsetof(struct smbios_type_1, manufacturer_str),
155                          strlen(buf) + 1, buf);
156     if (get_param_value(buf, sizeof(buf), "product", t))
157         smbios_add_field(1, offsetof(struct smbios_type_1, product_name_str),
158                          strlen(buf) + 1, buf);
159     if (get_param_value(buf, sizeof(buf), "version", t))
160         smbios_add_field(1, offsetof(struct smbios_type_1, version_str),
161                          strlen(buf) + 1, buf);
162     if (get_param_value(buf, sizeof(buf), "serial", t))
163         smbios_add_field(1, offsetof(struct smbios_type_1, serial_number_str),
164                          strlen(buf) + 1, buf);
165     if (get_param_value(buf, sizeof(buf), "uuid", t)) {
166         if (qemu_uuid_parse(buf, qemu_uuid) != 0) {
167             fprintf(stderr, "Invalid SMBIOS UUID string\n");
168             exit(1);
169         }
170     }
171     if (get_param_value(buf, sizeof(buf), "sku", t))
172         smbios_add_field(1, offsetof(struct smbios_type_1, sku_number_str),
173                          strlen(buf) + 1, buf);
174     if (get_param_value(buf, sizeof(buf), "family", t))
175         smbios_add_field(1, offsetof(struct smbios_type_1, family_str),
176                          strlen(buf) + 1, buf);
177 }
178 
smbios_entry_add(const char * t)179 int smbios_entry_add(const char *t)
180 {
181     char buf[1024];
182 
183     if (get_param_value(buf, sizeof(buf), "file", t)) {
184         struct smbios_structure_header *header;
185         struct smbios_table *table;
186         int size = get_image_size(buf);
187 
188         if (size == -1 || size < sizeof(struct smbios_structure_header)) {
189             fprintf(stderr, "Cannot read smbios file %s\n", buf);
190             exit(1);
191         }
192 
193         if (!smbios_entries) {
194             smbios_entries_len = sizeof(uint16_t);
195             smbios_entries = qemu_mallocz(smbios_entries_len);
196         }
197 
198         smbios_entries = qemu_realloc(smbios_entries, smbios_entries_len +
199                                                       sizeof(*table) + size);
200         table = (struct smbios_table *)(smbios_entries + smbios_entries_len);
201         table->header.type = SMBIOS_TABLE_ENTRY;
202         table->header.length = cpu_to_le16(sizeof(*table) + size);
203 
204         if (load_image(buf, table->data) != size) {
205             fprintf(stderr, "Failed to load smbios file %s", buf);
206             exit(1);
207         }
208 
209         header = (struct smbios_structure_header *)(table->data);
210         smbios_check_collision(header->type, SMBIOS_TABLE_ENTRY);
211         if (header->type == 4) {
212             smbios_type4_count++;
213         }
214 
215         smbios_entries_len += sizeof(*table) + size;
216         (*(uint16_t *)smbios_entries) =
217                 cpu_to_le16(le16_to_cpu(*(uint16_t *)smbios_entries) + 1);
218         return 0;
219     }
220 
221     if (get_param_value(buf, sizeof(buf), "type", t)) {
222         unsigned long type = strtoul(buf, NULL, 0);
223         switch (type) {
224         case 0:
225             smbios_build_type_0_fields(t);
226             return 0;
227         case 1:
228             smbios_build_type_1_fields(t);
229             return 0;
230         default:
231             fprintf(stderr, "Don't know how to build fields for SMBIOS type "
232                     "%ld\n", type);
233             exit(1);
234         }
235     }
236 
237     fprintf(stderr, "smbios: must specify type= or file=\n");
238     return -1;
239 }
240