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1da177e4 LT |
1 | /* |
2 | * $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $ | |
3 | * | |
4 | * Procfs interface for the PCI bus. | |
5 | * | |
6 | * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz> | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/pci.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/proc_fs.h> | |
13 | #include <linux/seq_file.h> | |
14 | #include <linux/smp_lock.h> | |
15 | ||
16 | #include <asm/uaccess.h> | |
17 | #include <asm/byteorder.h> | |
bc56b9e0 | 18 | #include "pci.h" |
1da177e4 LT |
19 | |
20 | static int proc_initialized; /* = 0 */ | |
21 | ||
22 | static loff_t | |
23 | proc_bus_pci_lseek(struct file *file, loff_t off, int whence) | |
24 | { | |
25 | loff_t new = -1; | |
26 | struct inode *inode = file->f_dentry->d_inode; | |
27 | ||
28 | down(&inode->i_sem); | |
29 | switch (whence) { | |
30 | case 0: | |
31 | new = off; | |
32 | break; | |
33 | case 1: | |
34 | new = file->f_pos + off; | |
35 | break; | |
36 | case 2: | |
37 | new = inode->i_size + off; | |
38 | break; | |
39 | } | |
40 | if (new < 0 || new > inode->i_size) | |
41 | new = -EINVAL; | |
42 | else | |
43 | file->f_pos = new; | |
44 | up(&inode->i_sem); | |
45 | return new; | |
46 | } | |
47 | ||
48 | static ssize_t | |
49 | proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) | |
50 | { | |
51 | const struct inode *ino = file->f_dentry->d_inode; | |
52 | const struct proc_dir_entry *dp = PDE(ino); | |
53 | struct pci_dev *dev = dp->data; | |
54 | unsigned int pos = *ppos; | |
55 | unsigned int cnt, size; | |
56 | ||
57 | /* | |
58 | * Normal users can read only the standardized portion of the | |
59 | * configuration space as several chips lock up when trying to read | |
60 | * undefined locations (think of Intel PIIX4 as a typical example). | |
61 | */ | |
62 | ||
63 | if (capable(CAP_SYS_ADMIN)) | |
64 | size = dev->cfg_size; | |
65 | else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
66 | size = 128; | |
67 | else | |
68 | size = 64; | |
69 | ||
70 | if (pos >= size) | |
71 | return 0; | |
72 | if (nbytes >= size) | |
73 | nbytes = size; | |
74 | if (pos + nbytes > size) | |
75 | nbytes = size - pos; | |
76 | cnt = nbytes; | |
77 | ||
78 | if (!access_ok(VERIFY_WRITE, buf, cnt)) | |
79 | return -EINVAL; | |
80 | ||
81 | if ((pos & 1) && cnt) { | |
82 | unsigned char val; | |
83 | pci_read_config_byte(dev, pos, &val); | |
84 | __put_user(val, buf); | |
85 | buf++; | |
86 | pos++; | |
87 | cnt--; | |
88 | } | |
89 | ||
90 | if ((pos & 3) && cnt > 2) { | |
91 | unsigned short val; | |
92 | pci_read_config_word(dev, pos, &val); | |
93 | __put_user(cpu_to_le16(val), (unsigned short __user *) buf); | |
94 | buf += 2; | |
95 | pos += 2; | |
96 | cnt -= 2; | |
97 | } | |
98 | ||
99 | while (cnt >= 4) { | |
100 | unsigned int val; | |
101 | pci_read_config_dword(dev, pos, &val); | |
102 | __put_user(cpu_to_le32(val), (unsigned int __user *) buf); | |
103 | buf += 4; | |
104 | pos += 4; | |
105 | cnt -= 4; | |
106 | } | |
107 | ||
108 | if (cnt >= 2) { | |
109 | unsigned short val; | |
110 | pci_read_config_word(dev, pos, &val); | |
111 | __put_user(cpu_to_le16(val), (unsigned short __user *) buf); | |
112 | buf += 2; | |
113 | pos += 2; | |
114 | cnt -= 2; | |
115 | } | |
116 | ||
117 | if (cnt) { | |
118 | unsigned char val; | |
119 | pci_read_config_byte(dev, pos, &val); | |
120 | __put_user(val, buf); | |
121 | buf++; | |
122 | pos++; | |
123 | cnt--; | |
124 | } | |
125 | ||
126 | *ppos = pos; | |
127 | return nbytes; | |
128 | } | |
129 | ||
130 | static ssize_t | |
131 | proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos) | |
132 | { | |
133 | const struct inode *ino = file->f_dentry->d_inode; | |
134 | const struct proc_dir_entry *dp = PDE(ino); | |
135 | struct pci_dev *dev = dp->data; | |
136 | int pos = *ppos; | |
137 | int size = dev->cfg_size; | |
138 | int cnt; | |
139 | ||
140 | if (pos >= size) | |
141 | return 0; | |
142 | if (nbytes >= size) | |
143 | nbytes = size; | |
144 | if (pos + nbytes > size) | |
145 | nbytes = size - pos; | |
146 | cnt = nbytes; | |
147 | ||
148 | if (!access_ok(VERIFY_READ, buf, cnt)) | |
149 | return -EINVAL; | |
150 | ||
151 | if ((pos & 1) && cnt) { | |
152 | unsigned char val; | |
153 | __get_user(val, buf); | |
154 | pci_write_config_byte(dev, pos, val); | |
155 | buf++; | |
156 | pos++; | |
157 | cnt--; | |
158 | } | |
159 | ||
160 | if ((pos & 3) && cnt > 2) { | |
161 | unsigned short val; | |
162 | __get_user(val, (unsigned short __user *) buf); | |
163 | pci_write_config_word(dev, pos, le16_to_cpu(val)); | |
164 | buf += 2; | |
165 | pos += 2; | |
166 | cnt -= 2; | |
167 | } | |
168 | ||
169 | while (cnt >= 4) { | |
170 | unsigned int val; | |
171 | __get_user(val, (unsigned int __user *) buf); | |
172 | pci_write_config_dword(dev, pos, le32_to_cpu(val)); | |
173 | buf += 4; | |
174 | pos += 4; | |
175 | cnt -= 4; | |
176 | } | |
177 | ||
178 | if (cnt >= 2) { | |
179 | unsigned short val; | |
180 | __get_user(val, (unsigned short __user *) buf); | |
181 | pci_write_config_word(dev, pos, le16_to_cpu(val)); | |
182 | buf += 2; | |
183 | pos += 2; | |
184 | cnt -= 2; | |
185 | } | |
186 | ||
187 | if (cnt) { | |
188 | unsigned char val; | |
189 | __get_user(val, buf); | |
190 | pci_write_config_byte(dev, pos, val); | |
191 | buf++; | |
192 | pos++; | |
193 | cnt--; | |
194 | } | |
195 | ||
196 | *ppos = pos; | |
197 | return nbytes; | |
198 | } | |
199 | ||
200 | struct pci_filp_private { | |
201 | enum pci_mmap_state mmap_state; | |
202 | int write_combine; | |
203 | }; | |
204 | ||
205 | static int proc_bus_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
206 | { | |
207 | const struct proc_dir_entry *dp = PDE(inode); | |
208 | struct pci_dev *dev = dp->data; | |
209 | #ifdef HAVE_PCI_MMAP | |
210 | struct pci_filp_private *fpriv = file->private_data; | |
211 | #endif /* HAVE_PCI_MMAP */ | |
212 | int ret = 0; | |
213 | ||
214 | switch (cmd) { | |
215 | case PCIIOC_CONTROLLER: | |
216 | ret = pci_domain_nr(dev->bus); | |
217 | break; | |
218 | ||
219 | #ifdef HAVE_PCI_MMAP | |
220 | case PCIIOC_MMAP_IS_IO: | |
221 | fpriv->mmap_state = pci_mmap_io; | |
222 | break; | |
223 | ||
224 | case PCIIOC_MMAP_IS_MEM: | |
225 | fpriv->mmap_state = pci_mmap_mem; | |
226 | break; | |
227 | ||
228 | case PCIIOC_WRITE_COMBINE: | |
229 | if (arg) | |
230 | fpriv->write_combine = 1; | |
231 | else | |
232 | fpriv->write_combine = 0; | |
233 | break; | |
234 | ||
235 | #endif /* HAVE_PCI_MMAP */ | |
236 | ||
237 | default: | |
238 | ret = -EINVAL; | |
239 | break; | |
240 | }; | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | #ifdef HAVE_PCI_MMAP | |
246 | static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) | |
247 | { | |
248 | struct inode *inode = file->f_dentry->d_inode; | |
249 | const struct proc_dir_entry *dp = PDE(inode); | |
250 | struct pci_dev *dev = dp->data; | |
251 | struct pci_filp_private *fpriv = file->private_data; | |
252 | int ret; | |
253 | ||
254 | if (!capable(CAP_SYS_RAWIO)) | |
255 | return -EPERM; | |
256 | ||
257 | ret = pci_mmap_page_range(dev, vma, | |
258 | fpriv->mmap_state, | |
259 | fpriv->write_combine); | |
260 | if (ret < 0) | |
261 | return ret; | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static int proc_bus_pci_open(struct inode *inode, struct file *file) | |
267 | { | |
268 | struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); | |
269 | ||
270 | if (!fpriv) | |
271 | return -ENOMEM; | |
272 | ||
273 | fpriv->mmap_state = pci_mmap_io; | |
274 | fpriv->write_combine = 0; | |
275 | ||
276 | file->private_data = fpriv; | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | static int proc_bus_pci_release(struct inode *inode, struct file *file) | |
282 | { | |
283 | kfree(file->private_data); | |
284 | file->private_data = NULL; | |
285 | ||
286 | return 0; | |
287 | } | |
288 | #endif /* HAVE_PCI_MMAP */ | |
289 | ||
290 | static struct file_operations proc_bus_pci_operations = { | |
291 | .llseek = proc_bus_pci_lseek, | |
292 | .read = proc_bus_pci_read, | |
293 | .write = proc_bus_pci_write, | |
294 | .ioctl = proc_bus_pci_ioctl, | |
295 | #ifdef HAVE_PCI_MMAP | |
296 | .open = proc_bus_pci_open, | |
297 | .release = proc_bus_pci_release, | |
298 | .mmap = proc_bus_pci_mmap, | |
299 | #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA | |
300 | .get_unmapped_area = get_pci_unmapped_area, | |
301 | #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ | |
302 | #endif /* HAVE_PCI_MMAP */ | |
303 | }; | |
304 | ||
305 | #if BITS_PER_LONG == 32 | |
306 | #define LONG_FORMAT "\t%08lx" | |
307 | #else | |
308 | #define LONG_FORMAT "\t%16lx" | |
309 | #endif | |
310 | ||
311 | /* iterator */ | |
312 | static void *pci_seq_start(struct seq_file *m, loff_t *pos) | |
313 | { | |
314 | struct pci_dev *dev = NULL; | |
315 | loff_t n = *pos; | |
316 | ||
317 | for_each_pci_dev(dev) { | |
318 | if (!n--) | |
319 | break; | |
320 | } | |
321 | return dev; | |
322 | } | |
323 | ||
324 | static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
325 | { | |
326 | struct pci_dev *dev = v; | |
327 | ||
328 | (*pos)++; | |
329 | dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); | |
330 | return dev; | |
331 | } | |
332 | ||
333 | static void pci_seq_stop(struct seq_file *m, void *v) | |
334 | { | |
335 | if (v) { | |
336 | struct pci_dev *dev = v; | |
337 | pci_dev_put(dev); | |
338 | } | |
339 | } | |
340 | ||
341 | static int show_device(struct seq_file *m, void *v) | |
342 | { | |
343 | const struct pci_dev *dev = v; | |
344 | const struct pci_driver *drv; | |
345 | int i; | |
346 | ||
347 | if (dev == NULL) | |
348 | return 0; | |
349 | ||
350 | drv = pci_dev_driver(dev); | |
351 | seq_printf(m, "%02x%02x\t%04x%04x\t%x", | |
352 | dev->bus->number, | |
353 | dev->devfn, | |
354 | dev->vendor, | |
355 | dev->device, | |
356 | dev->irq); | |
357 | /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */ | |
2311b1f2 ME |
358 | for (i=0; i<7; i++) { |
359 | u64 start, end; | |
360 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
1da177e4 | 361 | seq_printf(m, LONG_FORMAT, |
2311b1f2 | 362 | ((unsigned long)start) | |
1da177e4 | 363 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK)); |
2311b1f2 ME |
364 | } |
365 | for (i=0; i<7; i++) { | |
366 | u64 start, end; | |
367 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
1da177e4 LT |
368 | seq_printf(m, LONG_FORMAT, |
369 | dev->resource[i].start < dev->resource[i].end ? | |
2311b1f2 ME |
370 | (unsigned long)(end - start) + 1 : 0); |
371 | } | |
1da177e4 LT |
372 | seq_putc(m, '\t'); |
373 | if (drv) | |
374 | seq_printf(m, "%s", drv->name); | |
375 | seq_putc(m, '\n'); | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static struct seq_operations proc_bus_pci_devices_op = { | |
380 | .start = pci_seq_start, | |
381 | .next = pci_seq_next, | |
382 | .stop = pci_seq_stop, | |
383 | .show = show_device | |
384 | }; | |
385 | ||
386 | static struct proc_dir_entry *proc_bus_pci_dir; | |
387 | ||
388 | int pci_proc_attach_device(struct pci_dev *dev) | |
389 | { | |
390 | struct pci_bus *bus = dev->bus; | |
391 | struct proc_dir_entry *e; | |
392 | char name[16]; | |
393 | ||
394 | if (!proc_initialized) | |
395 | return -EACCES; | |
396 | ||
397 | if (!bus->procdir) { | |
398 | if (pci_proc_domain(bus)) { | |
399 | sprintf(name, "%04x:%02x", pci_domain_nr(bus), | |
400 | bus->number); | |
401 | } else { | |
402 | sprintf(name, "%02x", bus->number); | |
403 | } | |
404 | bus->procdir = proc_mkdir(name, proc_bus_pci_dir); | |
405 | if (!bus->procdir) | |
406 | return -ENOMEM; | |
407 | } | |
408 | ||
409 | sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
410 | e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir); | |
411 | if (!e) | |
412 | return -ENOMEM; | |
413 | e->proc_fops = &proc_bus_pci_operations; | |
414 | e->data = dev; | |
415 | e->size = dev->cfg_size; | |
416 | dev->procent = e; | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
421 | int pci_proc_detach_device(struct pci_dev *dev) | |
422 | { | |
423 | struct proc_dir_entry *e; | |
424 | ||
425 | if ((e = dev->procent)) { | |
426 | if (atomic_read(&e->count)) | |
427 | return -EBUSY; | |
428 | remove_proc_entry(e->name, dev->bus->procdir); | |
429 | dev->procent = NULL; | |
430 | } | |
431 | return 0; | |
432 | } | |
433 | ||
434 | int pci_proc_attach_bus(struct pci_bus* bus) | |
435 | { | |
436 | struct proc_dir_entry *de = bus->procdir; | |
437 | ||
438 | if (!proc_initialized) | |
439 | return -EACCES; | |
440 | ||
441 | if (!de) { | |
442 | char name[16]; | |
443 | sprintf(name, "%02x", bus->number); | |
444 | de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); | |
445 | if (!de) | |
446 | return -ENOMEM; | |
447 | } | |
448 | return 0; | |
449 | } | |
450 | ||
451 | int pci_proc_detach_bus(struct pci_bus* bus) | |
452 | { | |
453 | struct proc_dir_entry *de = bus->procdir; | |
454 | if (de) | |
455 | remove_proc_entry(de->name, proc_bus_pci_dir); | |
456 | return 0; | |
457 | } | |
458 | ||
459 | #ifdef CONFIG_PCI_LEGACY_PROC | |
460 | ||
461 | /* | |
462 | * Backward compatible /proc/pci interface. | |
463 | */ | |
464 | ||
465 | /* | |
466 | * Convert some of the configuration space registers of the device at | |
467 | * address (bus,devfn) into a string (possibly several lines each). | |
468 | * The configuration string is stored starting at buf[len]. If the | |
469 | * string would exceed the size of the buffer (SIZE), 0 is returned. | |
470 | */ | |
471 | static int show_dev_config(struct seq_file *m, void *v) | |
472 | { | |
473 | struct pci_dev *dev = v; | |
474 | struct pci_dev *first_dev; | |
475 | struct pci_driver *drv; | |
476 | u32 class_rev; | |
982245f0 | 477 | unsigned char latency, min_gnt, max_lat; |
1da177e4 LT |
478 | int reg; |
479 | ||
480 | first_dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
481 | if (dev == first_dev) | |
482 | seq_puts(m, "PCI devices found:\n"); | |
483 | pci_dev_put(first_dev); | |
484 | ||
485 | drv = pci_dev_driver(dev); | |
486 | ||
487 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev); | |
488 | pci_read_config_byte (dev, PCI_LATENCY_TIMER, &latency); | |
489 | pci_read_config_byte (dev, PCI_MIN_GNT, &min_gnt); | |
490 | pci_read_config_byte (dev, PCI_MAX_LAT, &max_lat); | |
491 | seq_printf(m, " Bus %2d, device %3d, function %2d:\n", | |
492 | dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
982245f0 | 493 | seq_printf(m, " Class %04x", class_rev >> 16); |
1da177e4 | 494 | seq_printf(m, ": PCI device %04x:%04x", dev->vendor, dev->device); |
1da177e4 LT |
495 | seq_printf(m, " (rev %d).\n", class_rev & 0xff); |
496 | ||
497 | if (dev->irq) | |
498 | seq_printf(m, " IRQ %d.\n", dev->irq); | |
499 | ||
500 | if (latency || min_gnt || max_lat) { | |
501 | seq_printf(m, " Master Capable. "); | |
502 | if (latency) | |
503 | seq_printf(m, "Latency=%d. ", latency); | |
504 | else | |
505 | seq_puts(m, "No bursts. "); | |
506 | if (min_gnt) | |
507 | seq_printf(m, "Min Gnt=%d.", min_gnt); | |
508 | if (max_lat) | |
509 | seq_printf(m, "Max Lat=%d.", max_lat); | |
510 | seq_putc(m, '\n'); | |
511 | } | |
512 | ||
513 | for (reg = 0; reg < 6; reg++) { | |
514 | struct resource *res = dev->resource + reg; | |
515 | unsigned long base, end, flags; | |
516 | ||
517 | base = res->start; | |
518 | end = res->end; | |
519 | flags = res->flags; | |
520 | if (!end) | |
521 | continue; | |
522 | ||
523 | if (flags & PCI_BASE_ADDRESS_SPACE_IO) { | |
524 | seq_printf(m, " I/O at 0x%lx [0x%lx].\n", | |
525 | base, end); | |
526 | } else { | |
527 | const char *pref, *type = "unknown"; | |
528 | ||
529 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) | |
530 | pref = "P"; | |
531 | else | |
532 | pref = "Non-p"; | |
533 | switch (flags & PCI_BASE_ADDRESS_MEM_TYPE_MASK) { | |
534 | case PCI_BASE_ADDRESS_MEM_TYPE_32: | |
535 | type = "32 bit"; break; | |
536 | case PCI_BASE_ADDRESS_MEM_TYPE_1M: | |
537 | type = "20 bit"; break; | |
538 | case PCI_BASE_ADDRESS_MEM_TYPE_64: | |
539 | type = "64 bit"; break; | |
540 | } | |
541 | seq_printf(m, " %srefetchable %s memory at " | |
542 | "0x%lx [0x%lx].\n", pref, type, | |
543 | base, | |
544 | end); | |
545 | } | |
546 | } | |
547 | return 0; | |
548 | } | |
549 | ||
550 | static struct seq_operations proc_pci_op = { | |
551 | .start = pci_seq_start, | |
552 | .next = pci_seq_next, | |
553 | .stop = pci_seq_stop, | |
554 | .show = show_dev_config | |
555 | }; | |
556 | ||
557 | static int proc_pci_open(struct inode *inode, struct file *file) | |
558 | { | |
559 | return seq_open(file, &proc_pci_op); | |
560 | } | |
561 | static struct file_operations proc_pci_operations = { | |
562 | .open = proc_pci_open, | |
563 | .read = seq_read, | |
564 | .llseek = seq_lseek, | |
565 | .release = seq_release, | |
566 | }; | |
567 | ||
568 | static void legacy_proc_init(void) | |
569 | { | |
570 | struct proc_dir_entry * entry = create_proc_entry("pci", 0, NULL); | |
571 | if (entry) | |
572 | entry->proc_fops = &proc_pci_operations; | |
573 | } | |
574 | ||
575 | #else | |
576 | ||
577 | static void legacy_proc_init(void) | |
578 | { | |
579 | ||
580 | } | |
581 | ||
582 | #endif /* CONFIG_PCI_LEGACY_PROC */ | |
583 | ||
584 | static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) | |
585 | { | |
586 | return seq_open(file, &proc_bus_pci_devices_op); | |
587 | } | |
588 | static struct file_operations proc_bus_pci_dev_operations = { | |
589 | .open = proc_bus_pci_dev_open, | |
590 | .read = seq_read, | |
591 | .llseek = seq_lseek, | |
592 | .release = seq_release, | |
593 | }; | |
594 | ||
595 | static int __init pci_proc_init(void) | |
596 | { | |
597 | struct proc_dir_entry *entry; | |
598 | struct pci_dev *dev = NULL; | |
599 | proc_bus_pci_dir = proc_mkdir("pci", proc_bus); | |
600 | entry = create_proc_entry("devices", 0, proc_bus_pci_dir); | |
601 | if (entry) | |
602 | entry->proc_fops = &proc_bus_pci_dev_operations; | |
603 | proc_initialized = 1; | |
604 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { | |
605 | pci_proc_attach_device(dev); | |
606 | } | |
607 | legacy_proc_init(); | |
608 | return 0; | |
609 | } | |
610 | ||
611 | __initcall(pci_proc_init); | |
612 | ||
613 | #ifdef CONFIG_HOTPLUG | |
614 | EXPORT_SYMBOL(pci_proc_attach_device); | |
615 | EXPORT_SYMBOL(pci_proc_attach_bus); | |
616 | EXPORT_SYMBOL(pci_proc_detach_bus); | |
617 | #endif | |
618 |