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sfc: Log specific message for failure of NVRAM self-test
[linux/fpc-iii.git] / fs / proc / vmcore.c
blob9fbc99ec799a5636e455cc1982b5196ad3096690
1 /*
2 * fs/proc/vmcore.c Interface for accessing the crash
3 * dump from the system's previous life.
4 * Heavily borrowed from fs/proc/kcore.c
5 * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
6 * Copyright (C) IBM Corporation, 2004. All rights reserved
7 *
8 */
9
10 #include <linux/mm.h>
11 #include <linux/proc_fs.h>
12 #include <linux/user.h>
13 #include <linux/elf.h>
14 #include <linux/elfcore.h>
15 #include <linux/slab.h>
16 #include <linux/highmem.h>
17 #include <linux/bootmem.h>
18 #include <linux/init.h>
19 #include <linux/crash_dump.h>
20 #include <linux/list.h>
21 #include <asm/uaccess.h>
22 #include <asm/io.h>
23
24 /* List representing chunks of contiguous memory areas and their offsets in
25 * vmcore file.
26 */
27 static LIST_HEAD(vmcore_list);
28
29 /* Stores the pointer to the buffer containing kernel elf core headers. */
30 static char *elfcorebuf;
31 static size_t elfcorebuf_sz;
32
33 /* Total size of vmcore file. */
34 static u64 vmcore_size;
35
36 static struct proc_dir_entry *proc_vmcore = NULL;
37
38 /* Reads a page from the oldmem device from given offset. */
39 static ssize_t read_from_oldmem(char *buf, size_t count,
40 u64 *ppos, int userbuf)
41 {
42 unsigned long pfn, offset;
43 size_t nr_bytes;
44 ssize_t read = 0, tmp;
45
46 if (!count)
47 return 0;
48
49 offset = (unsigned long)(*ppos % PAGE_SIZE);
50 pfn = (unsigned long)(*ppos / PAGE_SIZE);
51
52 do {
53 if (count > (PAGE_SIZE - offset))
54 nr_bytes = PAGE_SIZE - offset;
55 else
56 nr_bytes = count;
57
58 tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf);
59 if (tmp < 0)
60 return tmp;
61 *ppos += nr_bytes;
62 count -= nr_bytes;
63 buf += nr_bytes;
64 read += nr_bytes;
65 ++pfn;
66 offset = 0;
67 } while (count);
68
69 return read;
70 }
71
72 /* Maps vmcore file offset to respective physical address in memroy. */
73 static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list,
74 struct vmcore **m_ptr)
75 {
76 struct vmcore *m;
77 u64 paddr;
78
79 list_for_each_entry(m, vc_list, list) {
80 u64 start, end;
81 start = m->offset;
82 end = m->offset + m->size - 1;
83 if (offset >= start && offset <= end) {
84 paddr = m->paddr + offset - start;
85 *m_ptr = m;
86 return paddr;
87 }
88 }
89 *m_ptr = NULL;
90 return 0;
91 }
92
93 /* Read from the ELF header and then the crash dump. On error, negative value is
94 * returned otherwise number of bytes read are returned.
95 */
96 static ssize_t read_vmcore(struct file *file, char __user *buffer,
97 size_t buflen, loff_t *fpos)
98 {
99 ssize_t acc = 0, tmp;
100 size_t tsz;
101 u64 start, nr_bytes;
102 struct vmcore *curr_m = NULL;
103
104 if (buflen == 0 || *fpos >= vmcore_size)
105 return 0;
106
107 /* trim buflen to not go beyond EOF */
108 if (buflen > vmcore_size - *fpos)
109 buflen = vmcore_size - *fpos;
110
111 /* Read ELF core header */
112 if (*fpos < elfcorebuf_sz) {
113 tsz = elfcorebuf_sz - *fpos;
114 if (buflen < tsz)
115 tsz = buflen;
116 if (copy_to_user(buffer, elfcorebuf + *fpos, tsz))
117 return -EFAULT;
118 buflen -= tsz;
119 *fpos += tsz;
120 buffer += tsz;
121 acc += tsz;
122
123 /* leave now if filled buffer already */
124 if (buflen == 0)
125 return acc;
126 }
127
128 start = map_offset_to_paddr(*fpos, &vmcore_list, &curr_m);
129 if (!curr_m)
130 return -EINVAL;
131 if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
132 tsz = buflen;
133
134 /* Calculate left bytes in current memory segment. */
135 nr_bytes = (curr_m->size - (start - curr_m->paddr));
136 if (tsz > nr_bytes)
137 tsz = nr_bytes;
138
139 while (buflen) {
140 tmp = read_from_oldmem(buffer, tsz, &start, 1);
141 if (tmp < 0)
142 return tmp;
143 buflen -= tsz;
144 *fpos += tsz;
145 buffer += tsz;
146 acc += tsz;
147 if (start >= (curr_m->paddr + curr_m->size)) {
148 if (curr_m->list.next == &vmcore_list)
149 return acc; /*EOF*/
150 curr_m = list_entry(curr_m->list.next,
151 struct vmcore, list);
152 start = curr_m->paddr;
153 }
154 if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
155 tsz = buflen;
156 /* Calculate left bytes in current memory segment. */
157 nr_bytes = (curr_m->size - (start - curr_m->paddr));
158 if (tsz > nr_bytes)
159 tsz = nr_bytes;
160 }
161 return acc;
162 }
163
164 static const struct file_operations proc_vmcore_operations = {
165 .read = read_vmcore,
166 };
167
168 static struct vmcore* __init get_new_element(void)
169 {
170 return kzalloc(sizeof(struct vmcore), GFP_KERNEL);
171 }
172
173 static u64 __init get_vmcore_size_elf64(char *elfptr)
174 {
175 int i;
176 u64 size;
177 Elf64_Ehdr *ehdr_ptr;
178 Elf64_Phdr *phdr_ptr;
179
180 ehdr_ptr = (Elf64_Ehdr *)elfptr;
181 phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
182 size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr));
183 for (i = 0; i < ehdr_ptr->e_phnum; i++) {
184 size += phdr_ptr->p_memsz;
185 phdr_ptr++;
186 }
187 return size;
188 }
189
190 static u64 __init get_vmcore_size_elf32(char *elfptr)
191 {
192 int i;
193 u64 size;
194 Elf32_Ehdr *ehdr_ptr;
195 Elf32_Phdr *phdr_ptr;
196
197 ehdr_ptr = (Elf32_Ehdr *)elfptr;
198 phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
199 size = sizeof(Elf32_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr));
200 for (i = 0; i < ehdr_ptr->e_phnum; i++) {
201 size += phdr_ptr->p_memsz;
202 phdr_ptr++;
203 }
204 return size;
205 }
206
207 /* Merges all the PT_NOTE headers into one. */
208 static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz,
209 struct list_head *vc_list)
210 {
211 int i, nr_ptnote=0, rc=0;
212 char *tmp;
213 Elf64_Ehdr *ehdr_ptr;
214 Elf64_Phdr phdr, *phdr_ptr;
215 Elf64_Nhdr *nhdr_ptr;
216 u64 phdr_sz = 0, note_off;
217
218 ehdr_ptr = (Elf64_Ehdr *)elfptr;
219 phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
220 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
221 int j;
222 void *notes_section;
223 struct vmcore *new;
224 u64 offset, max_sz, sz, real_sz = 0;
225 if (phdr_ptr->p_type != PT_NOTE)
226 continue;
227 nr_ptnote++;
228 max_sz = phdr_ptr->p_memsz;
229 offset = phdr_ptr->p_offset;
230 notes_section = kmalloc(max_sz, GFP_KERNEL);
231 if (!notes_section)
232 return -ENOMEM;
233 rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
234 if (rc < 0) {
235 kfree(notes_section);
236 return rc;
237 }
238 nhdr_ptr = notes_section;
239 for (j = 0; j < max_sz; j += sz) {
240 if (nhdr_ptr->n_namesz == 0)
241 break;
242 sz = sizeof(Elf64_Nhdr) +
243 ((nhdr_ptr->n_namesz + 3) & ~3) +
244 ((nhdr_ptr->n_descsz + 3) & ~3);
245 real_sz += sz;
246 nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz);
247 }
248
249 /* Add this contiguous chunk of notes section to vmcore list.*/
250 new = get_new_element();
251 if (!new) {
252 kfree(notes_section);
253 return -ENOMEM;
254 }
255 new->paddr = phdr_ptr->p_offset;
256 new->size = real_sz;
257 list_add_tail(&new->list, vc_list);
258 phdr_sz += real_sz;
259 kfree(notes_section);
260 }
261
262 /* Prepare merged PT_NOTE program header. */
263 phdr.p_type = PT_NOTE;
264 phdr.p_flags = 0;
265 note_off = sizeof(Elf64_Ehdr) +
266 (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr);
267 phdr.p_offset = note_off;
268 phdr.p_vaddr = phdr.p_paddr = 0;
269 phdr.p_filesz = phdr.p_memsz = phdr_sz;
270 phdr.p_align = 0;
271
272 /* Add merged PT_NOTE program header*/
273 tmp = elfptr + sizeof(Elf64_Ehdr);
274 memcpy(tmp, &phdr, sizeof(phdr));
275 tmp += sizeof(phdr);
276
277 /* Remove unwanted PT_NOTE program headers. */
278 i = (nr_ptnote - 1) * sizeof(Elf64_Phdr);
279 *elfsz = *elfsz - i;
280 memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr)));
281
282 /* Modify e_phnum to reflect merged headers. */
283 ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
284
285 return 0;
286 }
287
288 /* Merges all the PT_NOTE headers into one. */
289 static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz,
290 struct list_head *vc_list)
291 {
292 int i, nr_ptnote=0, rc=0;
293 char *tmp;
294 Elf32_Ehdr *ehdr_ptr;
295 Elf32_Phdr phdr, *phdr_ptr;
296 Elf32_Nhdr *nhdr_ptr;
297 u64 phdr_sz = 0, note_off;
298
299 ehdr_ptr = (Elf32_Ehdr *)elfptr;
300 phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
301 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
302 int j;
303 void *notes_section;
304 struct vmcore *new;
305 u64 offset, max_sz, sz, real_sz = 0;
306 if (phdr_ptr->p_type != PT_NOTE)
307 continue;
308 nr_ptnote++;
309 max_sz = phdr_ptr->p_memsz;
310 offset = phdr_ptr->p_offset;
311 notes_section = kmalloc(max_sz, GFP_KERNEL);
312 if (!notes_section)
313 return -ENOMEM;
314 rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
315 if (rc < 0) {
316 kfree(notes_section);
317 return rc;
318 }
319 nhdr_ptr = notes_section;
320 for (j = 0; j < max_sz; j += sz) {
321 if (nhdr_ptr->n_namesz == 0)
322 break;
323 sz = sizeof(Elf32_Nhdr) +
324 ((nhdr_ptr->n_namesz + 3) & ~3) +
325 ((nhdr_ptr->n_descsz + 3) & ~3);
326 real_sz += sz;
327 nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz);
328 }
329
330 /* Add this contiguous chunk of notes section to vmcore list.*/
331 new = get_new_element();
332 if (!new) {
333 kfree(notes_section);
334 return -ENOMEM;
335 }
336 new->paddr = phdr_ptr->p_offset;
337 new->size = real_sz;
338 list_add_tail(&new->list, vc_list);
339 phdr_sz += real_sz;
340 kfree(notes_section);
341 }
342
343 /* Prepare merged PT_NOTE program header. */
344 phdr.p_type = PT_NOTE;
345 phdr.p_flags = 0;
346 note_off = sizeof(Elf32_Ehdr) +
347 (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr);
348 phdr.p_offset = note_off;
349 phdr.p_vaddr = phdr.p_paddr = 0;
350 phdr.p_filesz = phdr.p_memsz = phdr_sz;
351 phdr.p_align = 0;
352
353 /* Add merged PT_NOTE program header*/
354 tmp = elfptr + sizeof(Elf32_Ehdr);
355 memcpy(tmp, &phdr, sizeof(phdr));
356 tmp += sizeof(phdr);
357
358 /* Remove unwanted PT_NOTE program headers. */
359 i = (nr_ptnote - 1) * sizeof(Elf32_Phdr);
360 *elfsz = *elfsz - i;
361 memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr)));
362
363 /* Modify e_phnum to reflect merged headers. */
364 ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
365
366 return 0;
367 }
368
369 /* Add memory chunks represented by program headers to vmcore list. Also update
370 * the new offset fields of exported program headers. */
371 static int __init process_ptload_program_headers_elf64(char *elfptr,
372 size_t elfsz,
373 struct list_head *vc_list)
374 {
375 int i;
376 Elf64_Ehdr *ehdr_ptr;
377 Elf64_Phdr *phdr_ptr;
378 loff_t vmcore_off;
379 struct vmcore *new;
380
381 ehdr_ptr = (Elf64_Ehdr *)elfptr;
382 phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */
383
384 /* First program header is PT_NOTE header. */
385 vmcore_off = sizeof(Elf64_Ehdr) +
386 (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) +
387 phdr_ptr->p_memsz; /* Note sections */
388
389 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
390 if (phdr_ptr->p_type != PT_LOAD)
391 continue;
392
393 /* Add this contiguous chunk of memory to vmcore list.*/
394 new = get_new_element();
395 if (!new)
396 return -ENOMEM;
397 new->paddr = phdr_ptr->p_offset;
398 new->size = phdr_ptr->p_memsz;
399 list_add_tail(&new->list, vc_list);
400
401 /* Update the program header offset. */
402 phdr_ptr->p_offset = vmcore_off;
403 vmcore_off = vmcore_off + phdr_ptr->p_memsz;
404 }
405 return 0;
406 }
407
408 static int __init process_ptload_program_headers_elf32(char *elfptr,
409 size_t elfsz,
410 struct list_head *vc_list)
411 {
412 int i;
413 Elf32_Ehdr *ehdr_ptr;
414 Elf32_Phdr *phdr_ptr;
415 loff_t vmcore_off;
416 struct vmcore *new;
417
418 ehdr_ptr = (Elf32_Ehdr *)elfptr;
419 phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); /* PT_NOTE hdr */
420
421 /* First program header is PT_NOTE header. */
422 vmcore_off = sizeof(Elf32_Ehdr) +
423 (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) +
424 phdr_ptr->p_memsz; /* Note sections */
425
426 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
427 if (phdr_ptr->p_type != PT_LOAD)
428 continue;
429
430 /* Add this contiguous chunk of memory to vmcore list.*/
431 new = get_new_element();
432 if (!new)
433 return -ENOMEM;
434 new->paddr = phdr_ptr->p_offset;
435 new->size = phdr_ptr->p_memsz;
436 list_add_tail(&new->list, vc_list);
437
438 /* Update the program header offset */
439 phdr_ptr->p_offset = vmcore_off;
440 vmcore_off = vmcore_off + phdr_ptr->p_memsz;
441 }
442 return 0;
443 }
444
445 /* Sets offset fields of vmcore elements. */
446 static void __init set_vmcore_list_offsets_elf64(char *elfptr,
447 struct list_head *vc_list)
448 {
449 loff_t vmcore_off;
450 Elf64_Ehdr *ehdr_ptr;
451 struct vmcore *m;
452
453 ehdr_ptr = (Elf64_Ehdr *)elfptr;
454
455 /* Skip Elf header and program headers. */
456 vmcore_off = sizeof(Elf64_Ehdr) +
457 (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr);
458
459 list_for_each_entry(m, vc_list, list) {
460 m->offset = vmcore_off;
461 vmcore_off += m->size;
462 }
463 }
464
465 /* Sets offset fields of vmcore elements. */
466 static void __init set_vmcore_list_offsets_elf32(char *elfptr,
467 struct list_head *vc_list)
468 {
469 loff_t vmcore_off;
470 Elf32_Ehdr *ehdr_ptr;
471 struct vmcore *m;
472
473 ehdr_ptr = (Elf32_Ehdr *)elfptr;
474
475 /* Skip Elf header and program headers. */
476 vmcore_off = sizeof(Elf32_Ehdr) +
477 (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr);
478
479 list_for_each_entry(m, vc_list, list) {
480 m->offset = vmcore_off;
481 vmcore_off += m->size;
482 }
483 }
484
485 static int __init parse_crash_elf64_headers(void)
486 {
487 int rc=0;
488 Elf64_Ehdr ehdr;
489 u64 addr;
490
491 addr = elfcorehdr_addr;
492
493 /* Read Elf header */
494 rc = read_from_oldmem((char*)&ehdr, sizeof(Elf64_Ehdr), &addr, 0);
495 if (rc < 0)
496 return rc;
497
498 /* Do some basic Verification. */
499 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
500 (ehdr.e_type != ET_CORE) ||
501 !vmcore_elf_check_arch(&ehdr) ||
502 ehdr.e_ident[EI_CLASS] != ELFCLASS64 ||
503 ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
504 ehdr.e_version != EV_CURRENT ||
505 ehdr.e_ehsize != sizeof(Elf64_Ehdr) ||
506 ehdr.e_phentsize != sizeof(Elf64_Phdr) ||
507 ehdr.e_phnum == 0) {
508 printk(KERN_WARNING "Warning: Core image elf header is not"
509 "sane\n");
510 return -EINVAL;
511 }
512
513 /* Read in all elf headers. */
514 elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr);
515 elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
516 if (!elfcorebuf)
517 return -ENOMEM;
518 addr = elfcorehdr_addr;
519 rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
520 if (rc < 0) {
521 kfree(elfcorebuf);
522 return rc;
523 }
524
525 /* Merge all PT_NOTE headers into one. */
526 rc = merge_note_headers_elf64(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
527 if (rc) {
528 kfree(elfcorebuf);
529 return rc;
530 }
531 rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
532 &vmcore_list);
533 if (rc) {
534 kfree(elfcorebuf);
535 return rc;
536 }
537 set_vmcore_list_offsets_elf64(elfcorebuf, &vmcore_list);
538 return 0;
539 }
540
541 static int __init parse_crash_elf32_headers(void)
542 {
543 int rc=0;
544 Elf32_Ehdr ehdr;
545 u64 addr;
546
547 addr = elfcorehdr_addr;
548
549 /* Read Elf header */
550 rc = read_from_oldmem((char*)&ehdr, sizeof(Elf32_Ehdr), &addr, 0);
551 if (rc < 0)
552 return rc;
553
554 /* Do some basic Verification. */
555 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
556 (ehdr.e_type != ET_CORE) ||
557 !elf_check_arch(&ehdr) ||
558 ehdr.e_ident[EI_CLASS] != ELFCLASS32||
559 ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
560 ehdr.e_version != EV_CURRENT ||
561 ehdr.e_ehsize != sizeof(Elf32_Ehdr) ||
562 ehdr.e_phentsize != sizeof(Elf32_Phdr) ||
563 ehdr.e_phnum == 0) {
564 printk(KERN_WARNING "Warning: Core image elf header is not"
565 "sane\n");
566 return -EINVAL;
567 }
568
569 /* Read in all elf headers. */
570 elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr);
571 elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
572 if (!elfcorebuf)
573 return -ENOMEM;
574 addr = elfcorehdr_addr;
575 rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
576 if (rc < 0) {
577 kfree(elfcorebuf);
578 return rc;
579 }
580
581 /* Merge all PT_NOTE headers into one. */
582 rc = merge_note_headers_elf32(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
583 if (rc) {
584 kfree(elfcorebuf);
585 return rc;
586 }
587 rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
588 &vmcore_list);
589 if (rc) {
590 kfree(elfcorebuf);
591 return rc;
592 }
593 set_vmcore_list_offsets_elf32(elfcorebuf, &vmcore_list);
594 return 0;
595 }
596
597 static int __init parse_crash_elf_headers(void)
598 {
599 unsigned char e_ident[EI_NIDENT];
600 u64 addr;
601 int rc=0;
602
603 addr = elfcorehdr_addr;
604 rc = read_from_oldmem(e_ident, EI_NIDENT, &addr, 0);
605 if (rc < 0)
606 return rc;
607 if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) {
608 printk(KERN_WARNING "Warning: Core image elf header"
609 " not found\n");
610 return -EINVAL;
611 }
612
613 if (e_ident[EI_CLASS] == ELFCLASS64) {
614 rc = parse_crash_elf64_headers();
615 if (rc)
616 return rc;
617
618 /* Determine vmcore size. */
619 vmcore_size = get_vmcore_size_elf64(elfcorebuf);
620 } else if (e_ident[EI_CLASS] == ELFCLASS32) {
621 rc = parse_crash_elf32_headers();
622 if (rc)
623 return rc;
624
625 /* Determine vmcore size. */
626 vmcore_size = get_vmcore_size_elf32(elfcorebuf);
627 } else {
628 printk(KERN_WARNING "Warning: Core image elf header is not"
629 " sane\n");
630 return -EINVAL;
631 }
632 return 0;
633 }
634
635 /* Init function for vmcore module. */
636 static int __init vmcore_init(void)
637 {
638 int rc = 0;
639
640 /* If elfcorehdr= has been passed in cmdline, then capture the dump.*/
641 if (!(is_vmcore_usable()))
642 return rc;
643 rc = parse_crash_elf_headers();
644 if (rc) {
645 printk(KERN_WARNING "Kdump: vmcore not initialized\n");
646 return rc;
647 }
648
649 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
650 if (proc_vmcore)
651 proc_vmcore->size = vmcore_size;
652 return 0;
653 }
654 module_init(vmcore_init)
Linux with added FPC-III support