1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
/*
* Dump DMI information in a way hopefully compatible with dmidecode
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "sysdump.h"
struct dmi_header {
char signature[5];
uint8_t csum;
uint16_t tbllen;
uint32_t tbladdr;
uint16_t nstruc;
uint8_t revision;
uint8_t reserved;
};
struct smbios_header {
char signature[4];
uint8_t csum;
uint8_t len;
uint8_t major;
uint8_t minor;
uint16_t maxsize;
uint8_t revision;
uint8_t fmt[5];
struct dmi_header dmi;
};
static uint8_t checksum(const void *buf, size_t len)
{
const uint8_t *p = buf;
uint8_t csum = 0;
while (len--)
csum += *p++;
return csum;
}
static bool is_old_dmi(size_t dptr)
{
const struct dmi_header *dmi = (void *)dptr;
return !memcmp(dmi->signature, "_DMI_", 5) &&
!checksum(dmi, 0x0f);
return false;
}
static bool is_smbios(size_t dptr)
{
const struct smbios_header *smb = (void *)dptr;
return !memcmp(smb->signature, "_SM_", 4) &&
!checksum(smb, smb->len) &&
is_old_dmi(dptr+16);
}
static void dump_smbios(struct upload_backend *be, size_t dptr)
{
const struct smbios_header *smb = (void *)dptr;
struct smbios_header smx = *smb;
char filename[32];
snprintf(filename, sizeof filename, "dmi/%05x.%08x",
dptr, smb->dmi.tbladdr);
cpio_hdr(be, MODE_FILE, smb->dmi.tbllen + 32, filename);
/*
* Adjust the address of the smbios table to be 32, to
* make dmidecode happy. The checksum on the smbios table is unchanged,
* since it includes the checksum on the dmi table.
*/
smx.dmi.tbladdr = sizeof smx;
smx.dmi.csum -= checksum(&smx.dmi, 0x0f);
write_data(be, &smx, sizeof smx);
write_data(be, (const void *)smb->dmi.tbladdr, smb->dmi.tbllen);
}
static void dump_old_dmi(struct upload_backend *be, size_t dptr)
{
const struct dmi_header *dmi = (void *)dptr;
struct fake {
struct dmi_header dmi;
char pad[16];
} fake;
char filename[32];
snprintf(filename, sizeof filename, "dmi/%05x.%08x",
dptr, dmi->tbladdr);
cpio_hdr(be, MODE_FILE, dmi->tbllen + 32, filename);
/*
* Adjust the address of the smbios table to be 32, to
* make dmidecode happy.
*/
fake.dmi = *dmi;
memset(&fake.pad, 0, sizeof fake.pad);
fake.dmi.tbladdr = sizeof fake;
fake.dmi.csum -= checksum(&fake.dmi, 0x0f);
write_data(be, &fake, sizeof fake);
write_data(be, (const void *)dmi->tbladdr, dmi->tbllen);
}
void dump_dmi(struct upload_backend *be)
{
size_t dptr;
cpio_mkdir(be, "dmi");
/* Search for _SM_ or _DMI_ structure */
for (dptr = 0xf0000 ; dptr < 0x100000 ; dptr += 16) {
if (is_smbios(dptr)) {
dump_smbios(be, dptr);
dptr += 16; /* Skip the subsequent DMI header */
} else if (is_old_dmi(dptr)) {
dump_old_dmi(be, dptr);
}
}
}
|
