Newer
Older
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
/*
* A tool to read SPEC-internal memory (only BAR0)
*
* Alessandro Rubini 2012 for CERN, GPLv2 or later.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "spec-tools.h"
int main(int argc, char **argv)
{
int i, fd;
uint32_t base, *ptr;
uint32_t uarg[3];
void *map_base;
char *end;
if (argc < 2 || argc > 3) {
fprintf(stderr,
"Use: \"%s <offset> [<value>]\" (I/O is 32 bits)\n",
argv[0]);
exit(1);
}
if((fd = open("/dev/mem", O_RDWR | O_SYNC)) < 0) {
fprintf(stderr, "%s: open(/dev/mem): %s\n", argv[0],
strerror(errno));
exit(1);
}
base = spec_get_base();
if (base == (typeof(base))-1) {
fprintf(stderr, "%s: spec_get_base(): %s\n", argv[0],
strerror(errno));
exit(1);
}
map_base = mmap(0, 1024 * 1024, /* gennum's bar 0 is 1M */
PROT_READ | PROT_WRITE, MAP_SHARED, fd, base);
if(map_base == (void *) -1) {
fprintf(stderr, "%s: mmap(/dev/mem): %s\n", argv[0],
strerror(errno));
exit(1);
}
for (i = 1; i < argc; i++) {
uarg[i] = strtol(argv[i], &end, 16);
if (end && *end) {
fprintf(stderr, "%s: \"%s\" is not an hex number\n",
argv[0], argv[i]);
exit(1);
}
}
if (uarg[1] & 3) {
fprintf(stderr, "%s: address \"%s\" not multiple of 4\n",
argv[0], argv[1]);
exit(1);
}
ptr = map_base + uarg[1];
/* by default, operate quietly (only report read value) */
if (argc == 2) {
uarg[2] = *ptr;
if (!getenv("VERBOSE"))
printf("%08x\n", uarg[2]);
} else {
*ptr = uarg[2];
}
/* be verbose, if so requested */
if (getenv("VERBOSE")) {
if (argc == 2)
printf("%08x == %08x\n", uarg[1], uarg[2]);
else
printf("%08x := %08x\n", uarg[1], uarg[2]);
}
exit (0);
}