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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ppc64/kernel/nvram.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/ppc64/kernel/nvram.c')
-rw-r--r--arch/ppc64/kernel/nvram.c746
1 files changed, 746 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/nvram.c b/arch/ppc64/kernel/nvram.c
new file mode 100644
index 000000000000..b9069c2d1933
--- /dev/null
+++ b/arch/ppc64/kernel/nvram.c
@@ -0,0 +1,746 @@
1/*
2 * c 2001 PPC 64 Team, IBM Corp
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * /dev/nvram driver for PPC64
10 *
11 * This perhaps should live in drivers/char
12 *
13 * TODO: Split the /dev/nvram part (that one can use
14 * drivers/char/generic_nvram.c) from the arch & partition
15 * parsing code.
16 */
17
18#include <linux/module.h>
19
20#include <linux/types.h>
21#include <linux/errno.h>
22#include <linux/fs.h>
23#include <linux/miscdevice.h>
24#include <linux/fcntl.h>
25#include <linux/nvram.h>
26#include <linux/init.h>
27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <asm/uaccess.h>
30#include <asm/nvram.h>
31#include <asm/rtas.h>
32#include <asm/prom.h>
33#include <asm/machdep.h>
34#include <asm/systemcfg.h>
35
36#undef DEBUG_NVRAM
37
38static int nvram_scan_partitions(void);
39static int nvram_setup_partition(void);
40static int nvram_create_os_partition(void);
41static int nvram_remove_os_partition(void);
42
43static struct nvram_partition * nvram_part;
44static long nvram_error_log_index = -1;
45static long nvram_error_log_size = 0;
46
47int no_logging = 1; /* Until we initialize everything,
48 * make sure we don't try logging
49 * anything */
50
51extern volatile int error_log_cnt;
52
53struct err_log_info {
54 int error_type;
55 unsigned int seq_num;
56};
57
58static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
59{
60 int size;
61
62 if (ppc_md.nvram_size == NULL)
63 return -ENODEV;
64 size = ppc_md.nvram_size();
65
66 switch (origin) {
67 case 1:
68 offset += file->f_pos;
69 break;
70 case 2:
71 offset += size;
72 break;
73 }
74 if (offset < 0)
75 return -EINVAL;
76 file->f_pos = offset;
77 return file->f_pos;
78}
79
80
81static ssize_t dev_nvram_read(struct file *file, char __user *buf,
82 size_t count, loff_t *ppos)
83{
84 ssize_t len;
85 char *tmp_buffer;
86 int size;
87
88 if (ppc_md.nvram_size == NULL)
89 return -ENODEV;
90 size = ppc_md.nvram_size();
91
92 if (!access_ok(VERIFY_WRITE, buf, count))
93 return -EFAULT;
94 if (*ppos >= size)
95 return 0;
96 if (count > size)
97 count = size;
98
99 tmp_buffer = (char *) kmalloc(count, GFP_KERNEL);
100 if (!tmp_buffer) {
101 printk(KERN_ERR "dev_read_nvram: kmalloc failed\n");
102 return -ENOMEM;
103 }
104
105 len = ppc_md.nvram_read(tmp_buffer, count, ppos);
106 if ((long)len <= 0) {
107 kfree(tmp_buffer);
108 return len;
109 }
110
111 if (copy_to_user(buf, tmp_buffer, len)) {
112 kfree(tmp_buffer);
113 return -EFAULT;
114 }
115
116 kfree(tmp_buffer);
117 return len;
118
119}
120
121static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
122 size_t count, loff_t *ppos)
123{
124 ssize_t len;
125 char * tmp_buffer;
126 int size;
127
128 if (ppc_md.nvram_size == NULL)
129 return -ENODEV;
130 size = ppc_md.nvram_size();
131
132 if (!access_ok(VERIFY_READ, buf, count))
133 return -EFAULT;
134 if (*ppos >= size)
135 return 0;
136 if (count > size)
137 count = size;
138
139 tmp_buffer = (char *) kmalloc(count, GFP_KERNEL);
140 if (!tmp_buffer) {
141 printk(KERN_ERR "dev_nvram_write: kmalloc failed\n");
142 return -ENOMEM;
143 }
144
145 if (copy_from_user(tmp_buffer, buf, count)) {
146 kfree(tmp_buffer);
147 return -EFAULT;
148 }
149
150 len = ppc_md.nvram_write(tmp_buffer, count, ppos);
151 if ((long)len <= 0) {
152 kfree(tmp_buffer);
153 return len;
154 }
155
156 kfree(tmp_buffer);
157 return len;
158}
159
160static int dev_nvram_ioctl(struct inode *inode, struct file *file,
161 unsigned int cmd, unsigned long arg)
162{
163 switch(cmd) {
164#ifdef CONFIG_PPC_PMAC
165 case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
166 printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
167 case IOC_NVRAM_GET_OFFSET: {
168 int part, offset;
169
170 if (systemcfg->platform != PLATFORM_POWERMAC)
171 return -EINVAL;
172 if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
173 return -EFAULT;
174 if (part < pmac_nvram_OF || part > pmac_nvram_NR)
175 return -EINVAL;
176 offset = pmac_get_partition(part);
177 if (offset < 0)
178 return offset;
179 if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
180 return -EFAULT;
181 return 0;
182 }
183#endif /* CONFIG_PPC_PMAC */
184 }
185 return -EINVAL;
186}
187
188struct file_operations nvram_fops = {
189 .owner = THIS_MODULE,
190 .llseek = dev_nvram_llseek,
191 .read = dev_nvram_read,
192 .write = dev_nvram_write,
193 .ioctl = dev_nvram_ioctl,
194};
195
196static struct miscdevice nvram_dev = {
197 NVRAM_MINOR,
198 "nvram",
199 &nvram_fops
200};
201
202
203#ifdef DEBUG_NVRAM
204static void nvram_print_partitions(char * label)
205{
206 struct list_head * p;
207 struct nvram_partition * tmp_part;
208
209 printk(KERN_WARNING "--------%s---------\n", label);
210 printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
211 list_for_each(p, &nvram_part->partition) {
212 tmp_part = list_entry(p, struct nvram_partition, partition);
213 printk(KERN_WARNING "%d \t%02x\t%02x\t%d\t%s\n",
214 tmp_part->index, tmp_part->header.signature,
215 tmp_part->header.checksum, tmp_part->header.length,
216 tmp_part->header.name);
217 }
218}
219#endif
220
221
222static int nvram_write_header(struct nvram_partition * part)
223{
224 loff_t tmp_index;
225 int rc;
226
227 tmp_index = part->index;
228 rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index);
229
230 return rc;
231}
232
233
234static unsigned char nvram_checksum(struct nvram_header *p)
235{
236 unsigned int c_sum, c_sum2;
237 unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */
238 c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5];
239
240 /* The sum may have spilled into the 3rd byte. Fold it back. */
241 c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff;
242 /* The sum cannot exceed 2 bytes. Fold it into a checksum */
243 c_sum2 = (c_sum >> 8) + (c_sum << 8);
244 c_sum = ((c_sum + c_sum2) >> 8) & 0xff;
245 return c_sum;
246}
247
248
249/*
250 * Find an nvram partition, sig can be 0 for any
251 * partition or name can be NULL for any name, else
252 * tries to match both
253 */
254struct nvram_partition *nvram_find_partition(int sig, const char *name)
255{
256 struct nvram_partition * part;
257 struct list_head * p;
258
259 list_for_each(p, &nvram_part->partition) {
260 part = list_entry(p, struct nvram_partition, partition);
261
262 if (sig && part->header.signature != sig)
263 continue;
264 if (name && 0 != strncmp(name, part->header.name, 12))
265 continue;
266 return part;
267 }
268 return NULL;
269}
270EXPORT_SYMBOL(nvram_find_partition);
271
272
273static int nvram_remove_os_partition(void)
274{
275 struct list_head *i;
276 struct list_head *j;
277 struct nvram_partition * part;
278 struct nvram_partition * cur_part;
279 int rc;
280
281 list_for_each(i, &nvram_part->partition) {
282 part = list_entry(i, struct nvram_partition, partition);
283 if (part->header.signature != NVRAM_SIG_OS)
284 continue;
285
286 /* Make os partition a free partition */
287 part->header.signature = NVRAM_SIG_FREE;
288 sprintf(part->header.name, "wwwwwwwwwwww");
289 part->header.checksum = nvram_checksum(&part->header);
290
291 /* Merge contiguous free partitions backwards */
292 list_for_each_prev(j, &part->partition) {
293 cur_part = list_entry(j, struct nvram_partition, partition);
294 if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
295 break;
296 }
297
298 part->header.length += cur_part->header.length;
299 part->header.checksum = nvram_checksum(&part->header);
300 part->index = cur_part->index;
301
302 list_del(&cur_part->partition);
303 kfree(cur_part);
304 j = &part->partition; /* fixup our loop */
305 }
306
307 /* Merge contiguous free partitions forwards */
308 list_for_each(j, &part->partition) {
309 cur_part = list_entry(j, struct nvram_partition, partition);
310 if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
311 break;
312 }
313
314 part->header.length += cur_part->header.length;
315 part->header.checksum = nvram_checksum(&part->header);
316
317 list_del(&cur_part->partition);
318 kfree(cur_part);
319 j = &part->partition; /* fixup our loop */
320 }
321
322 rc = nvram_write_header(part);
323 if (rc <= 0) {
324 printk(KERN_ERR "nvram_remove_os_partition: nvram_write failed (%d)\n", rc);
325 return rc;
326 }
327
328 }
329
330 return 0;
331}
332
333/* nvram_create_os_partition
334 *
335 * Create a OS linux partition to buffer error logs.
336 * Will create a partition starting at the first free
337 * space found if space has enough room.
338 */
339static int nvram_create_os_partition(void)
340{
341 struct list_head * p;
342 struct nvram_partition * part;
343 struct nvram_partition * new_part = NULL;
344 struct nvram_partition * free_part = NULL;
345 int seq_init[2] = { 0, 0 };
346 loff_t tmp_index;
347 long size = 0;
348 int rc;
349
350 /* Find a free partition that will give us the maximum needed size
351 If can't find one that will give us the minimum size needed */
352 list_for_each(p, &nvram_part->partition) {
353 part = list_entry(p, struct nvram_partition, partition);
354 if (part->header.signature != NVRAM_SIG_FREE)
355 continue;
356
357 if (part->header.length >= NVRAM_MAX_REQ) {
358 size = NVRAM_MAX_REQ;
359 free_part = part;
360 break;
361 }
362 if (!size && part->header.length >= NVRAM_MIN_REQ) {
363 size = NVRAM_MIN_REQ;
364 free_part = part;
365 }
366 }
367 if (!size) {
368 return -ENOSPC;
369 }
370
371 /* Create our OS partition */
372 new_part = (struct nvram_partition *)
373 kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
374 if (!new_part) {
375 printk(KERN_ERR "nvram_create_os_partition: kmalloc failed\n");
376 return -ENOMEM;
377 }
378
379 new_part->index = free_part->index;
380 new_part->header.signature = NVRAM_SIG_OS;
381 new_part->header.length = size;
382 sprintf(new_part->header.name, "ppc64,linux");
383 new_part->header.checksum = nvram_checksum(&new_part->header);
384
385 rc = nvram_write_header(new_part);
386 if (rc <= 0) {
387 printk(KERN_ERR "nvram_create_os_partition: nvram_write_header \
388 failed (%d)\n", rc);
389 return rc;
390 }
391
392 /* make sure and initialize to zero the sequence number and the error
393 type logged */
394 tmp_index = new_part->index + NVRAM_HEADER_LEN;
395 rc = ppc_md.nvram_write((char *)&seq_init, sizeof(seq_init), &tmp_index);
396 if (rc <= 0) {
397 printk(KERN_ERR "nvram_create_os_partition: nvram_write failed (%d)\n", rc);
398 return rc;
399 }
400
401 nvram_error_log_index = new_part->index + NVRAM_HEADER_LEN;
402 nvram_error_log_size = ((part->header.length - 1) *
403 NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
404
405 list_add_tail(&new_part->partition, &free_part->partition);
406
407 if (free_part->header.length <= size) {
408 list_del(&free_part->partition);
409 kfree(free_part);
410 return 0;
411 }
412
413 /* Adjust the partition we stole the space from */
414 free_part->index += size * NVRAM_BLOCK_LEN;
415 free_part->header.length -= size;
416 free_part->header.checksum = nvram_checksum(&free_part->header);
417
418 rc = nvram_write_header(free_part);
419 if (rc <= 0) {
420 printk(KERN_ERR "nvram_create_os_partition: nvram_write_header "
421 "failed (%d)\n", rc);
422 return rc;
423 }
424
425 return 0;
426}
427
428
429/* nvram_setup_partition
430 *
431 * This will setup the partition we need for buffering the
432 * error logs and cleanup partitions if needed.
433 *
434 * The general strategy is the following:
435 * 1.) If there is ppc64,linux partition large enough then use it.
436 * 2.) If there is not a ppc64,linux partition large enough, search
437 * for a free partition that is large enough.
438 * 3.) If there is not a free partition large enough remove
439 * _all_ OS partitions and consolidate the space.
440 * 4.) Will first try getting a chunk that will satisfy the maximum
441 * error log size (NVRAM_MAX_REQ).
442 * 5.) If the max chunk cannot be allocated then try finding a chunk
443 * that will satisfy the minum needed (NVRAM_MIN_REQ).
444 */
445static int nvram_setup_partition(void)
446{
447 struct list_head * p;
448 struct nvram_partition * part;
449 int rc;
450
451 /* For now, we don't do any of this on pmac, until I
452 * have figured out if it's worth killing some unused stuffs
453 * in our nvram, as Apple defined partitions use pretty much
454 * all of the space
455 */
456 if (systemcfg->platform == PLATFORM_POWERMAC)
457 return -ENOSPC;
458
459 /* see if we have an OS partition that meets our needs.
460 will try getting the max we need. If not we'll delete
461 partitions and try again. */
462 list_for_each(p, &nvram_part->partition) {
463 part = list_entry(p, struct nvram_partition, partition);
464 if (part->header.signature != NVRAM_SIG_OS)
465 continue;
466
467 if (strcmp(part->header.name, "ppc64,linux"))
468 continue;
469
470 if (part->header.length >= NVRAM_MIN_REQ) {
471 /* found our partition */
472 nvram_error_log_index = part->index + NVRAM_HEADER_LEN;
473 nvram_error_log_size = ((part->header.length - 1) *
474 NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
475 return 0;
476 }
477 }
478
479 /* try creating a partition with the free space we have */
480 rc = nvram_create_os_partition();
481 if (!rc) {
482 return 0;
483 }
484
485 /* need to free up some space */
486 rc = nvram_remove_os_partition();
487 if (rc) {
488 return rc;
489 }
490
491 /* create a partition in this new space */
492 rc = nvram_create_os_partition();
493 if (rc) {
494 printk(KERN_ERR "nvram_create_os_partition: Could not find a "
495 "NVRAM partition large enough\n");
496 return rc;
497 }
498
499 return 0;
500}
501
502
503static int nvram_scan_partitions(void)
504{
505 loff_t cur_index = 0;
506 struct nvram_header phead;
507 struct nvram_partition * tmp_part;
508 unsigned char c_sum;
509 char * header;
510 int total_size;
511 int err;
512
513 if (ppc_md.nvram_size == NULL)
514 return -ENODEV;
515 total_size = ppc_md.nvram_size();
516
517 header = (char *) kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL);
518 if (!header) {
519 printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n");
520 return -ENOMEM;
521 }
522
523 while (cur_index < total_size) {
524
525 err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index);
526 if (err != NVRAM_HEADER_LEN) {
527 printk(KERN_ERR "nvram_scan_partitions: Error parsing "
528 "nvram partitions\n");
529 goto out;
530 }
531
532 cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */
533
534 memcpy(&phead, header, NVRAM_HEADER_LEN);
535
536 err = 0;
537 c_sum = nvram_checksum(&phead);
538 if (c_sum != phead.checksum) {
539 printk(KERN_WARNING "WARNING: nvram partition checksum"
540 " was %02x, should be %02x!\n",
541 phead.checksum, c_sum);
542 printk(KERN_WARNING "Terminating nvram partition scan\n");
543 goto out;
544 }
545 if (!phead.length) {
546 printk(KERN_WARNING "WARNING: nvram corruption "
547 "detected: 0-length partition\n");
548 goto out;
549 }
550 tmp_part = (struct nvram_partition *)
551 kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
552 err = -ENOMEM;
553 if (!tmp_part) {
554 printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n");
555 goto out;
556 }
557
558 memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN);
559 tmp_part->index = cur_index;
560 list_add_tail(&tmp_part->partition, &nvram_part->partition);
561
562 cur_index += phead.length * NVRAM_BLOCK_LEN;
563 }
564 err = 0;
565
566 out:
567 kfree(header);
568 return err;
569}
570
571static int __init nvram_init(void)
572{
573 int error;
574 int rc;
575
576 if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
577 return -ENODEV;
578
579 rc = misc_register(&nvram_dev);
580 if (rc != 0) {
581 printk(KERN_ERR "nvram_init: failed to register device\n");
582 return rc;
583 }
584
585 /* initialize our anchor for the nvram partition list */
586 nvram_part = (struct nvram_partition *) kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
587 if (!nvram_part) {
588 printk(KERN_ERR "nvram_init: Failed kmalloc\n");
589 return -ENOMEM;
590 }
591 INIT_LIST_HEAD(&nvram_part->partition);
592
593 /* Get all the NVRAM partitions */
594 error = nvram_scan_partitions();
595 if (error) {
596 printk(KERN_ERR "nvram_init: Failed nvram_scan_partitions\n");
597 return error;
598 }
599
600 if(nvram_setup_partition())
601 printk(KERN_WARNING "nvram_init: Could not find nvram partition"
602 " for nvram buffered error logging.\n");
603
604#ifdef DEBUG_NVRAM
605 nvram_print_partitions("NVRAM Partitions");
606#endif
607
608 return rc;
609}
610
611void __exit nvram_cleanup(void)
612{
613 misc_deregister( &nvram_dev );
614}
615
616
617#ifdef CONFIG_PPC_PSERIES
618
619/* nvram_write_error_log
620 *
621 * We need to buffer the error logs into nvram to ensure that we have
622 * the failure information to decode. If we have a severe error there
623 * is no way to guarantee that the OS or the machine is in a state to
624 * get back to user land and write the error to disk. For example if
625 * the SCSI device driver causes a Machine Check by writing to a bad
626 * IO address, there is no way of guaranteeing that the device driver
627 * is in any state that is would also be able to write the error data
628 * captured to disk, thus we buffer it in NVRAM for analysis on the
629 * next boot.
630 *
631 * In NVRAM the partition containing the error log buffer will looks like:
632 * Header (in bytes):
633 * +-----------+----------+--------+------------+------------------+
634 * | signature | checksum | length | name | data |
635 * |0 |1 |2 3|4 15|16 length-1|
636 * +-----------+----------+--------+------------+------------------+
637 *
638 * The 'data' section would look like (in bytes):
639 * +--------------+------------+-----------------------------------+
640 * | event_logged | sequence # | error log |
641 * |0 3|4 7|8 nvram_error_log_size-1|
642 * +--------------+------------+-----------------------------------+
643 *
644 * event_logged: 0 if event has not been logged to syslog, 1 if it has
645 * sequence #: The unique sequence # for each event. (until it wraps)
646 * error log: The error log from event_scan
647 */
648int nvram_write_error_log(char * buff, int length, unsigned int err_type)
649{
650 int rc;
651 loff_t tmp_index;
652 struct err_log_info info;
653
654 if (no_logging) {
655 return -EPERM;
656 }
657
658 if (nvram_error_log_index == -1) {
659 return -ESPIPE;
660 }
661
662 if (length > nvram_error_log_size) {
663 length = nvram_error_log_size;
664 }
665
666 info.error_type = err_type;
667 info.seq_num = error_log_cnt;
668
669 tmp_index = nvram_error_log_index;
670
671 rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index);
672 if (rc <= 0) {
673 printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
674 return rc;
675 }
676
677 rc = ppc_md.nvram_write(buff, length, &tmp_index);
678 if (rc <= 0) {
679 printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
680 return rc;
681 }
682
683 return 0;
684}
685
686/* nvram_read_error_log
687 *
688 * Reads nvram for error log for at most 'length'
689 */
690int nvram_read_error_log(char * buff, int length, unsigned int * err_type)
691{
692 int rc;
693 loff_t tmp_index;
694 struct err_log_info info;
695
696 if (nvram_error_log_index == -1)
697 return -1;
698
699 if (length > nvram_error_log_size)
700 length = nvram_error_log_size;
701
702 tmp_index = nvram_error_log_index;
703
704 rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index);
705 if (rc <= 0) {
706 printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
707 return rc;
708 }
709
710 rc = ppc_md.nvram_read(buff, length, &tmp_index);
711 if (rc <= 0) {
712 printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
713 return rc;
714 }
715
716 error_log_cnt = info.seq_num;
717 *err_type = info.error_type;
718
719 return 0;
720}
721
722/* This doesn't actually zero anything, but it sets the event_logged
723 * word to tell that this event is safely in syslog.
724 */
725int nvram_clear_error_log(void)
726{
727 loff_t tmp_index;
728 int clear_word = ERR_FLAG_ALREADY_LOGGED;
729 int rc;
730
731 tmp_index = nvram_error_log_index;
732
733 rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index);
734 if (rc <= 0) {
735 printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc);
736 return rc;
737 }
738
739 return 0;
740}
741
742#endif /* CONFIG_PPC_PSERIES */
743
744module_init(nvram_init);
745module_exit(nvram_cleanup);
746MODULE_LICENSE("GPL");