1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <getopt.h>
4 #include <stdio.h>
5 #include <sys/types.h>
6 #include <sys/stat.h>
7 #include <fcntl.h>
8 #include <stdlib.h>
9 #include <stdint.h>
10 #include <string.h>
11 #include <errno.h>
12 #include <unistd.h>
13 #include <sys/mman.h>
14 #if defined(__GLIBC__)
15 #include <sys/io.h>
16 #endif
17 #include <pci/pci.h>
18
19 #if defined(__sun) && (defined(__i386) || defined(__amd64))
20 #define MEM_DEV "/dev/xsvc"
21 #else
22 #define MEM_DEV "/dev/mem"
23 #endif
24
25 #define BUC_OFFSET 0x3414
26 #define GCS_OFFSET 0x3410
27
28 #define SPIBAR 0x3800
29 #define FDOC 0xb0
30 #define FDOD 0xb4
31
32 enum {
33 DESCRIPTOR_MAP_SECTION = 0,
34 COMPONENT_SECTION,
35 REGION_SECTION,
36 MASTER_SECTION,
37 PCHSTRAPS_SECTION,
38 };
39
40 enum {
41 BUCTS_UNINITIALIZED = -1,
42 BUCTS_UNSET = 0,
43 BUCTS_SET
44 };
45
46 static int fd_mem = -1;
47
print_usage(const char * name)48 static void print_usage(const char *name)
49 {
50 printf("usage: %s [-h?]\n", name);
51 printf("\n"
52 " -s | --set: Set the top swap bit to invert the bootblock region decoding\n"
53 " -u | --unset: Unset the top swap bit to have regular bootblock region decoding\n"
54 " -p | --print: print the current status of the hardware\n"
55 " -h | --help: print this help\n"
56 "\n");
57 }
58
sys_physmap(unsigned long phys_addr,size_t len)59 static void *sys_physmap(unsigned long phys_addr, size_t len)
60 {
61 void *virt_addr =
62 mmap(0, len, PROT_WRITE | PROT_READ, MAP_SHARED, fd_mem,
63 (off_t) phys_addr);
64 return virt_addr == MAP_FAILED ? NULL : virt_addr;
65 }
66
physunmap(void * virt_addr,size_t len)67 static void physunmap(void *virt_addr, size_t len)
68 {
69 if (!len) {
70 printf("Not unmapping zero size at %p\n", virt_addr);
71 return;
72 }
73 munmap(virt_addr, len);
74 }
75
physmap(const char * descr,unsigned long phys_addr,size_t len)76 static void *physmap(const char *descr, unsigned long phys_addr, size_t len)
77 {
78 void *virt_addr;
79
80 if (!descr)
81 descr = "memory";
82
83 if (!len) {
84 printf("Not mapping %s, zero size at 0x%08lx.\n", descr,
85 phys_addr);
86 return NULL;
87 }
88
89 if ((getpagesize() - 1) & len)
90 fprintf(stderr, "Unaligned size 0x%lx for %s at 0x%08lx!\n",
91 (unsigned long)len, descr, phys_addr);
92
93 if ((getpagesize() - 1) & phys_addr)
94 fprintf(stderr, "Unaligned address 0x%08lx for %s!\n",
95 phys_addr, descr);
96
97 virt_addr = sys_physmap(phys_addr, len);
98 if (!virt_addr) {
99 fprintf(stderr, "Error accessing 0x%lx bytes %s at 0x%08lx!\n",
100 (unsigned long)len, descr, phys_addr);
101 perror("mmap(" MEM_DEV ")");
102 if (errno == EINVAL) {
103 fprintf(stderr, "\n");
104 fprintf(stderr,
105 "In Linux this error can be caused by the CONFIG_NONPROMISC_DEVMEM (<2.6.27),\n");
106 fprintf(stderr,
107 "CONFIG_STRICT_DEVMEM (>=2.6.27) and CONFIG_X86_PAT kernel options.\n");
108 fprintf(stderr,
109 "Please check if either is enabled in your kernel before reporting a failure.\n");
110 fprintf(stderr,
111 "You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n");
112 fprintf(stderr,
113 "disabling the other option unfortunately requires a kernel recompile. Sorry!\n");
114 }
115 }
116
117 return virt_addr;
118 }
119
get_platform_info(struct pci_dev * sb,int * has_var_bb,uint32_t * rcba_addr)120 static int get_platform_info(struct pci_dev *sb, int *has_var_bb,
121 uint32_t *rcba_addr)
122 {
123 *has_var_bb = 0;
124 switch (sb->device_id) {
125 case 0x1c44: /* Z68 */
126 case 0x1c46: /* P67 */
127 case 0x1c47: /* UM67 */
128 case 0x1c49: /* HM68 */
129 case 0x1c4a: /* H67 */
130 case 0x1c4b: /* HM67 */
131 case 0x1c4c: /* Q65 */
132 case 0x1c4d: /* QS67 */
133 case 0x1c4e: /* Q67 */
134 case 0x1c4f: /* QM67 */
135 case 0x1c50: /* B65 */
136 case 0x1c52: /* C202 */
137 case 0x1c54: /* C204 */
138 case 0x1c56: /* C026 */
139 case 0x1c5c: /* H61 */
140 case 0x1d40: /* C60x/X79 */
141 case 0x1c41: /* C60x/X79 */
142 case 0x1e44: /* Z77 */
143 case 0x1e46: /* Z75 */
144 case 0x1e47: /* Q77 */
145 case 0x1e48: /* Q75 */
146 case 0x1e49: /* B75 */
147 case 0x1e4a: /* H77 */
148 case 0x1e53: /* C216 */
149 case 0x1e55: /* QM77 */
150 case 0x1e56: /* QS77 */
151 case 0x1e57: /* HM77 */
152 case 0x1e58: /* UM77 */
153 case 0x1e59: /* HM76 */
154 case 0x1e5d: /* HM75 */
155 case 0x1e5e: /* HM70 */
156 case 0x1e5f: /* NM70 */
157 case 0x3b02: /* P55 */
158 case 0x3b03: /* PM55 */
159 case 0x3b06: /* H55 */
160 case 0x3b07: /* QM55 */
161 case 0x3b08: /* H57 */
162 case 0x3b09: /* HM55 */
163 case 0x3b0a: /* Q57 */
164 case 0x3b0b: /* HM57 */
165 case 0x3b0d: /* PCH 3400 Mobile SFF */
166 case 0x3b0e: /* B55 */
167 case 0x3b0f: /* QS57 */
168 case 0x3b12: /* PCH 3400 */
169 case 0x3b14: /* PCH 3420 */
170 case 0x3b16: /* PCH 3450 */
171 case 0x3b1e: /* B55 */
172 case 0x8c40: /* Lynx Point */
173 case 0x8c41: /* Lynx Point Mobile Eng. Sample */
174 case 0x8c42: /* Lynx Point Desktop Eng. Sample */
175 case 0x8c43: /* Lynx Point */
176 case 0x8c44: /* Z87 */
177 case 0x8c45: /* Lynx Point */
178 *has_var_bb = 1;
179 /* fallthrough */
180 case 0x2640: /* ICH6/ICH6R */
181 case 0x2641: /* ICH6-M */
182 case 0x2642: /* ICH6W/ICH6RW */
183 case 0x2670: /* 631xESB/632xESB/3100 */
184 case 0x27b0: /* ICH7DH */
185 case 0x27b8: /* ICH7/ICH7R */
186 case 0x27b9: /* ICH7M */
187 case 0x27bd: /* ICH7MDH */
188 case 0x27bc: /* NM10 */
189 case 0x2810: /* ICH8/ICH8R */
190 case 0x2811: /* ICH8M-E */
191 case 0x2812: /* ICH8DH */
192 case 0x2814: /* ICH8DO */
193 case 0x2815: /* ICH8M */
194 case 0x2910: /* ICH9 Eng. Sample */
195 case 0x2912: /* ICH9DH */
196 case 0x2914: /* ICH9DO */
197 case 0x2916: /* ICH9R */
198 case 0x2917: /* ICH9M-E */
199 case 0x2918: /* ICH9 */
200 case 0x2919: /* ICH9M */
201 case 0x3a10: /* ICH10R Eng. Sample */
202 case 0x3a14: /* ICH10D0 */
203 case 0x3a16: /* ICH10R */
204 case 0x3a18: /* ICH10 */
205 case 0x3a1a: /* ICH10D */
206 case 0x3a1e: /* ICH10 Eng. Sample*/
207 case 0x3b00: /* PCH 3400 Desktop */
208 case 0x3b01: /* PCH 3400 Mobile */
209 *rcba_addr = pci_read_long(sb, 0xf0) & ~1;
210 return 0;
211 default:
212 fprintf(stderr, "Unsupported LPC bridge. Sorry.\n");
213 return 1;
214 }
215 }
216
print_status(uint32_t rcba_addr,int has_var_bb)217 int print_status(uint32_t rcba_addr, int has_var_bb)
218 {
219 int ret = 0;
220 volatile uint8_t *rcba;
221 int bild, ts, ts_size = 64 << 10;
222 rcba = physmap("RCBA", rcba_addr, 0x4000);
223 if (!rcba)
224 return 1;
225
226 bild = rcba[GCS_OFFSET] & 1;
227 ts = rcba[BUC_OFFSET] & 1;
228 int spi_is_bootdevice =
229 ((*(uint16_t *)(rcba + GCS_OFFSET) >> 10) & 3) == 3;
230
231 if (has_var_bb && spi_is_bootdevice) {
232 *(uint32_t *)(rcba + SPIBAR + FDOC) =
233 (PCHSTRAPS_SECTION << 12) | 0;
234 uint32_t pchstrap0 = *(uint32_t *)(rcba + SPIBAR + FDOD);
235 switch (pchstrap0 >> 29) {
236 case 0:
237 ts_size = 64 << 10;
238 break;
239 case 1:
240 ts_size = 128 << 10;
241 break;
242 case 2:
243 ts_size = 256 << 10;
244 break;
245 default:
246 printf("Unknown BIOS Boot-Block size (BBBS)\n");
247 ret = 1;
248 goto out;
249 }
250 }
251
252 printf("\nSystem status\n=============\n");
253 printf("BILD (BIOS Interface Lock-Down) : %s\n", bild
254 ? "set, changing top swap not possible" : "unset, changing top swap is possible");
255 printf("Top Swap : %s\n", ts ? "Enabled" : "Disabled");
256 printf("BIOS Boot-block Size (BBDS) : %dK\n", ts_size >> 10);
257 if (ts) {
258 printf("Ranges swapped : 0x%llx-0x%08llx <-> 0x%08llx-0x%08llx",
259 ((4ULL << 30) - ts_size),
260 (4ULL << 30) - 1,
261 (4ULL << 30) - 2 * ts_size,
262 (4ULL << 30) - ts_size - 1);
263 }
264
265 out:
266 physunmap((void *)rcba, 0x4000);
267 return ret;
268 }
269
set_bucts(uint32_t rcba_addr,int bucts_state)270 static int set_bucts(uint32_t rcba_addr, int bucts_state)
271 {
272 int ret = 0;
273 volatile uint8_t *rcba;
274 int bild;
275 rcba = physmap("RCBA", rcba_addr, 0x4000);
276 if (!rcba)
277 return 1;
278
279 bild = rcba[GCS_OFFSET] & 1;
280 if (bild) {
281 printf("BIOS Interface Lock-Down set, Changing Top Swap not possible.\n");
282 ret = 1;
283 goto out;
284 }
285
286
287 rcba[BUC_OFFSET] = bucts_state & 1;
288 if ((rcba[BUC_OFFSET] & 1) != bucts_state) {
289 fprintf(stderr, "Hu?! setting the top swap bit failed!\n");
290 ret = 1;
291 } else {
292 printf("Setting top swap bit succeeded.\n");
293 ret = 0;
294 }
295
296 out:
297 physunmap((void *)rcba, 0x4000);
298 return ret;
299 }
300
main(int argc,char * argv[])301 int main(int argc, char *argv[])
302 {
303 struct pci_access *pacc;
304 struct pci_dev *dev, *sb = NULL;
305 #if defined(__FreeBSD__)
306 int io_fd;
307 #endif
308 int opt, option_index = 0;
309 int print_state = 0;
310 int bucts_state = BUCTS_UNINITIALIZED;
311
312 static struct option long_options[] = {
313 {"unset", 0, 0, 'u'},
314 {"set", 0, 0, 's'},
315 {"print", 0, 0, 'p'},
316 {"help", 0, 0, 'h'},
317 {0, 0, 0, 0}
318 };
319
320
321 printf("bucts utility version '" VERSION "'\n");
322
323 if (argv[1] == NULL) {
324 print_usage(argv[0]);
325 exit(1);
326 }
327
328 while ((opt = getopt_long(argc, argv, "usph?:",
329 long_options, &option_index)) != EOF) {
330 switch (opt) {
331 case 'u':
332 if (bucts_state != BUCTS_UNINITIALIZED) {
333 printf("Invalid setting: multiple set/unset arguments\n");
334 exit(1);
335 }
336 if (print_state) {
337 printf("Print and Set are mutually exclusive!\n");
338 exit(1);
339 }
340 bucts_state = BUCTS_UNSET;
341 break;
342 case 's':
343 if (bucts_state != BUCTS_UNINITIALIZED) {
344 printf("Invalid setting: multiple set/unset arguments\n");
345 exit(1);
346 }
347 if (print_state) {
348 printf("Print and Set are mutually exclusive!\n");
349 exit(1);
350 }
351 bucts_state = BUCTS_SET;
352 break;
353 case 'p':
354 if (bucts_state != BUCTS_UNINITIALIZED) {
355 printf("Print and Set are mutually exclusive!\n");
356 exit(1);
357 }
358 print_state = 1;
359 break;
360 case 'h':
361 print_usage(argv[0]);
362 exit(0);
363 case '?':
364 default:
365 print_usage(argv[0]);
366 exit(1);
367 }
368 }
369
370 if (optind < argc) {
371 fprintf(stderr, "Error: Extra parameter found.\n");
372 print_usage(argv[0]);
373 exit(1);
374 }
375
376
377 #if defined(__FreeBSD__)
378 if ((io_fd = open("/dev/io", O_RDWR)) < 0) {
379 perror("open(/dev/io)");
380 #else
381 if (iopl(3)) {
382 perror("iopl");
383 #endif
384 printf("You need to be root.\n");
385 return 1;
386 }
387
388 if ((fd_mem = open(MEM_DEV, O_RDWR | O_SYNC)) == -1) {
389 perror("Error: open(" MEM_DEV ")");
390 return 1;
391 }
392
393 pacc = pci_alloc();
394 pci_init(pacc);
395 pci_scan_bus(pacc);
396 for (dev = pacc->devices; dev && !sb; dev = dev->next) {
397 pci_fill_info(dev, PCI_FILL_IDENT | PCI_FILL_CLASS);
398 if (dev->vendor_id != 0x8086 || dev->device_class != 0x0601)
399 continue;
400 sb = dev;
401 }
402 if (!sb) {
403 fprintf(stderr, "Error: LPC bridge not found!\n");
404 return 1;
405 }
406
407 printf("Using LPC bridge %04x:%04x at %02x%02x:%02x.%02x\n",
408 sb->vendor_id, sb->device_id, sb->domain, sb->bus, sb->dev,
409 sb->func);
410
411 int has_var_bb;
412 uint32_t rcba_addr;
413
414 if (get_platform_info(sb, &has_var_bb, &rcba_addr))
415 exit(1);
416
417 if (print_state)
418 print_status(rcba_addr, has_var_bb);
419 if (bucts_state != BUCTS_UNINITIALIZED) {
420 set_bucts(rcba_addr, bucts_state);
421 print_status(rcba_addr, has_var_bb);
422 }
423
424 close(fd_mem);
425 return 0;
426 }
427