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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* Common "util" functions
* This file is part of the dmidecode project.
*
* Copyright (C) 2002-2008 Jean Delvare <khali@linux-fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For the avoidance of doubt the "preferred form" of this code is one which
* is in an open unpatent encumbered format. Where cryptographic key signing
* forms part of the process of creating an executable the information
* including keys needed to generate an equivalently functional executable
* are deemed to be part of the source code.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include "config.h"
#ifdef USE_MMAP
#include <sys/mman.h>
#ifndef MAP_FAILED
#define MAP_FAILED ((void *) -1)
#endif /* !MAP_FAILED */
#endif /* USE MMAP */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include "types.h"
#include "util.h"
#include "dmilog.h"
#ifndef USE_MMAP
static int myread(Log_t *logp, int fd, u8 * buf, size_t count, const char *prefix)
{
ssize_t r = 1;
size_t r2 = 0;
while(r2 != count && r != 0) {
r = read(fd, buf + r2, count - r2);
if(r == -1) {
if(errno != EINTR) {
close(fd);
perror(prefix);
return -1;
}
} else
r2 += r;
}
if(r2 != count) {
close(fd);
log_append(logp, LOGFL_NORMAL, LOG_WARNING, "%s: Unexpected end of file", prefix);
return -1;
}
return 0;
}
#endif
int checksum(const u8 * buf, size_t len)
{
u8 sum = 0;
size_t a;
for(a = 0; a < len; a++)
sum += buf[a];
return (sum == 0);
}
/*
* Copy a physical memory chunk into a memory buffer.
* This function allocates memory.
*/
void *mem_chunk(Log_t *logp, size_t base, size_t len, const char *devmem)
{
void *p;
int fd;
#ifdef USE_MMAP
size_t mmoffset;
void *mmp;
#endif
if((fd = open(devmem, O_RDONLY)) == -1) {
log_append(logp, LOGFL_NORMAL, LOG_WARNING, "%s: %s", devmem, strerror(errno));
return NULL;
}
if((p = malloc(len)) == NULL) {
log_append(logp, LOGFL_NORMAL, LOG_WARNING, "malloc: %s", strerror(errno));
return NULL;
}
#ifdef USE_MMAP
#ifdef _SC_PAGESIZE
mmoffset = base % sysconf(_SC_PAGESIZE);
#else
mmoffset = base % getpagesize();
#endif /* _SC_PAGESIZE */
/*
* Please note that we don't use mmap() for performance reasons here,
* but to workaround problems many people encountered when trying
* to read from /dev/mem using regular read() calls.
*/
mmp = mmap(0, mmoffset + len, PROT_READ, MAP_SHARED, fd, base - mmoffset);
if(mmp == MAP_FAILED) {
log_append(logp, LOGFL_NORMAL, LOG_WARNING, "%s (mmap): %s", devmem, strerror(errno));
free(p);
return NULL;
}
memcpy(p, (u8 *) mmp + mmoffset, len);
if(munmap(mmp, mmoffset + len) == -1) {
log_append(logp, LOGFL_NORMAL, LOG_WARNING, "%s (munmap): %s", devmem, strerror(errno));
}
#else /* USE_MMAP */
if(lseek(fd, base, SEEK_SET) == -1) {
log_append(logp, LOGFL_NORMAL, LOG_WARNING, "%s (lseek): %s", devmem, strerror(errno));
free(p);
return NULL;
}
if(myread(logp, fd, p, len, devmem) == -1) {
free(p);
return NULL;
}
#endif /* USE_MMAP */
if(close(fd) == -1)
perror(devmem);
return p;
}
|
