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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/* compile: gcc -s -o bucts bucts.c -lpci -lz -static or: make
* run as root: ./bucts [0|1]
*/
/*
* Copyright (C) 2011 Peter Stuge <peter@stuge.se>
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#if defined(__GLIBC__)
#include <sys/io.h>
#endif
#include <pci/pci.h>
#if defined (__sun) && (defined(__i386) || defined(__amd64))
#define MEM_DEV "/dev/xsvc"
#else
#define MEM_DEV "/dev/mem"
#endif
static int fd_mem=-1;
static void *sys_physmap(unsigned long phys_addr, size_t len) {
void *virt_addr = mmap(0, len, PROT_WRITE|PROT_READ, MAP_SHARED, fd_mem, (off_t)phys_addr);
return MAP_FAILED == virt_addr ? NULL : virt_addr;
}
static void physunmap(void *virt_addr, size_t len) {
if (!len) {
printf("Not unmapping zero size at %p\n", virt_addr);
return;
}
munmap(virt_addr, len);
}
static void *physmap(const char *descr, unsigned long phys_addr, size_t len) {
void *virt_addr;
if (!descr)
descr = "memory";
if (!len) {
printf("Not mapping %s, zero size at 0x%08lx.\n", descr, phys_addr);
return NULL;
}
if ((getpagesize() - 1) & len)
fprintf(stderr, "Unaligned size 0x%lx for %s at 0x%08lx!\n", (unsigned long)len, descr, phys_addr);
if ((getpagesize() - 1) & phys_addr)
fprintf(stderr, "Unaligned address 0x%08lx for %s!\n", phys_addr, descr);
virt_addr = sys_physmap(phys_addr, len);
if (!virt_addr) {
fprintf(stderr, "Error accessing 0x%lx bytes %s at 0x%08lx!\n", (unsigned long)len, descr, phys_addr);
perror("mmap(" MEM_DEV ")");
if (EINVAL == errno) {
fprintf(stderr, "\n");
fprintf(stderr, "In Linux this error can be caused by the CONFIG_NONPROMISC_DEVMEM (<2.6.27),\n");
fprintf(stderr, "CONFIG_STRICT_DEVMEM (>=2.6.27) and CONFIG_X86_PAT kernel options.\n");
fprintf(stderr, "Please check if either is enabled in your kernel before reporting a failure.\n");
fprintf(stderr, "You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n");
fprintf(stderr, "disabling the other option unfortunately requires a kernel recompile. Sorry!\n");
}
}
return virt_addr;
}
int bucts(struct pci_dev *sb, int8_t newts) {
uint8_t buc, ts;
uint32_t rcba_addr;
volatile uint8_t *rcba;
const char *str[2]={
"128kb address range 0xFFFE0000-0xFFFFFFFF is untranslated",
"64kb address ranges at 0xFFFE0000 and 0xFFFF0000 are swapped"
};
switch (sb->device_id) {
case 0x27b9:
rcba_addr = pci_read_long(sb, 0xf0) & ~1;
break;
default:
fprintf(stderr, "Unsupported LPC bridge. Sorry.\n");
return 1;
}
rcba = physmap("RCBA", rcba_addr, 0x4000);
if (!rcba)
return 1;
buc = rcba[0x3414];
ts = buc & 1;
printf("Current BUC.TS=%d - %s\n", ts, str[ts]);
if (0 == newts || 1 == newts) {
if (ts == newts) {
printf("Not writing BUC register since TS is already correct.\n");
goto unmap;
}
buc &= ~1;
buc |= newts;
rcba[0x3414] = buc;
buc = rcba[0x3414];
ts = buc & 1;
printf("Updated BUC.TS=%d - %s\n", ts, str[ts]);
}
unmap:
physunmap((void *)rcba, 0x4000);
return 0;
}
int main(int argc, const char *argv[], const char *envp[]) {
int ret;
char *endp;
int8_t newts = -1;
struct pci_access *pacc;
struct pci_dev *dev, *sb = NULL;
#if defined(__FreeBSD__)
int io_fd;
#endif
printf("bucts utility version '" VERSION "'\n");
#if defined(__FreeBSD__)
if ((io_fd = open("/dev/io", O_RDWR)) < 0) {
perror("open(/dev/io)");
#else
if (iopl(3)) {
perror("iopl");
#endif
printf("You need to be root.\n");
return 1;
}
if (-1 == (fd_mem = open(MEM_DEV, O_RDWR|O_SYNC))) {
perror("Error: open(" MEM_DEV ")");
return 1;
}
pacc=pci_alloc();
pci_init(pacc);
pci_scan_bus(pacc);
for (dev=pacc->devices; dev && !sb; dev=dev->next) {
pci_fill_info(dev, PCI_FILL_IDENT|PCI_FILL_CLASS);
if (dev->vendor_id != 0x8086 || dev->device_class != 0x0601)
continue;
sb = dev;
}
if (!sb) {
fprintf(stderr, "Error: LPC bridge not found!\n");
return 1;
}
printf("Using LPC bridge %04x:%04x at %02x%02x:%02x.%02x\n", sb->vendor_id, sb->device_id, sb->domain, sb->bus, sb->dev, sb->func);
if (argc > 1) {
newts = strtoul(argv[1], &endp, 10);
if (endp == argv[1]) {
fprintf(stderr, "Invalid new TS value '%s', please specify 0 or 1.\n", argv[1]);
newts = -1;
}
}
ret = bucts(sb, newts);
close(fd_mem);
return ret;
}
|
