blob: 6483d1066b95e7feb967a0c77925381302eae61c [file] [log] [blame]
Thomas Mingarelli7f4da472007-12-04 17:41:54 +00001/*
2 * HP WatchDog Driver
3 * based on
4 *
5 * SoftDog 0.05: A Software Watchdog Device
6 *
7 * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
8 * Thomas Mingarelli <thomas.mingarelli@hp.com>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation
13 *
14 */
15
16#include <linux/device.h>
17#include <linux/fs.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/io.h>
21#include <linux/irq.h>
22#include <linux/kernel.h>
23#include <linux/miscdevice.h>
24#include <linux/mm.h>
25#include <linux/module.h>
26#include <linux/kdebug.h>
27#include <linux/moduleparam.h>
28#include <linux/notifier.h>
29#include <linux/pci.h>
30#include <linux/pci_ids.h>
31#include <linux/reboot.h>
32#include <linux/sched.h>
33#include <linux/timer.h>
34#include <linux/types.h>
35#include <linux/uaccess.h>
36#include <linux/watchdog.h>
37#include <linux/dmi.h>
38#include <linux/efi.h>
39#include <linux/string.h>
40#include <linux/bootmem.h>
41#include <linux/slab.h>
42#include <asm/dmi.h>
43#include <asm/desc.h>
44#include <asm/kdebug.h>
45
46#define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */
47#define CRU_BIOS_SIGNATURE_VALUE 0x55524324
48#define PCI_BIOS32_PARAGRAPH_LEN 16
49#define PCI_ROM_BASE1 0x000F0000
50#define ROM_SIZE 0x10000
51
52struct bios32_service_dir {
53 u32 signature;
54 u32 entry_point;
55 u8 revision;
56 u8 length;
57 u8 checksum;
58 u8 reserved[5];
59};
60
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000061/* type 212 */
62struct smbios_cru64_info {
63 u8 type;
64 u8 byte_length;
65 u16 handle;
66 u32 signature;
67 u64 physical_address;
68 u32 double_length;
69 u32 double_offset;
70};
71#define SMBIOS_CRU64_INFORMATION 212
72
73struct cmn_registers {
74 union {
75 struct {
76 u8 ral;
77 u8 rah;
78 u16 rea2;
79 };
80 u32 reax;
81 } u1;
82 union {
83 struct {
84 u8 rbl;
85 u8 rbh;
86 u8 reb2l;
87 u8 reb2h;
88 };
89 u32 rebx;
90 } u2;
91 union {
92 struct {
93 u8 rcl;
94 u8 rch;
95 u16 rec2;
96 };
97 u32 recx;
98 } u3;
99 union {
100 struct {
101 u8 rdl;
102 u8 rdh;
103 u16 red2;
104 };
105 u32 redx;
106 } u4;
107
108 u32 resi;
109 u32 redi;
110 u16 rds;
111 u16 res;
112 u32 reflags;
113} __attribute__((packed));
114
115#define DEFAULT_MARGIN 30
116static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
117static unsigned int reload; /* the computed soft_margin */
118static int nowayout = WATCHDOG_NOWAYOUT;
119static char expect_release;
120static unsigned long hpwdt_is_open;
121
122static void __iomem *pci_mem_addr; /* the PCI-memory address */
123static unsigned long __iomem *hpwdt_timer_reg;
124static unsigned long __iomem *hpwdt_timer_con;
125
126static DEFINE_SPINLOCK(rom_lock);
127
128static void *cru_rom_addr;
129
130static struct cmn_registers cmn_regs;
131
132static struct pci_device_id hpwdt_devices[] = {
133 {
134 .vendor = PCI_VENDOR_ID_COMPAQ,
135 .device = 0xB203,
136 .subvendor = PCI_ANY_ID,
137 .subdevice = PCI_ANY_ID,
138 },
139 {0}, /* terminate list */
140};
141MODULE_DEVICE_TABLE(pci, hpwdt_devices);
142
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000143#ifndef CONFIG_X86_64
144/* --32 Bit Bios------------------------------------------------------------ */
145
146#define HPWDT_ARCH 32
147
Adrian Bunk8b1266f2008-02-22 21:58:02 +0200148static void asminline_call(struct cmn_registers *pi86Regs,
149 unsigned long *pRomEntry)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000150{
151 asm("pushl %ebp \n\t"
152 "movl %esp, %ebp \n\t"
153 "pusha \n\t"
154 "pushf \n\t"
155 "push %es \n\t"
156 "push %ds \n\t"
157 "pop %es \n\t"
158 "movl 8(%ebp),%eax \n\t"
159 "movl 4(%eax),%ebx \n\t"
160 "movl 8(%eax),%ecx \n\t"
161 "movl 12(%eax),%edx \n\t"
162 "movl 16(%eax),%esi \n\t"
163 "movl 20(%eax),%edi \n\t"
164 "movl (%eax),%eax \n\t"
165 "push %cs \n\t"
166 "call *12(%ebp) \n\t"
167 "pushf \n\t"
168 "pushl %eax \n\t"
169 "movl 8(%ebp),%eax \n\t"
170 "movl %ebx,4(%eax) \n\t"
171 "movl %ecx,8(%eax) \n\t"
172 "movl %edx,12(%eax) \n\t"
173 "movl %esi,16(%eax) \n\t"
174 "movl %edi,20(%eax) \n\t"
175 "movw %ds,24(%eax) \n\t"
176 "movw %es,26(%eax) \n\t"
177 "popl %ebx \n\t"
178 "movl %ebx,(%eax) \n\t"
179 "popl %ebx \n\t"
180 "movl %ebx,28(%eax) \n\t"
181 "pop %es \n\t"
182 "popf \n\t"
183 "popa \n\t"
184 "leave \n\t" "ret");
185}
186
187/*
188 * cru_detect
189 *
190 * Routine Description:
191 * This function uses the 32-bit BIOS Service Directory record to
192 * search for a $CRU record.
193 *
194 * Return Value:
195 * 0 : SUCCESS
196 * <0 : FAILURE
197 */
198static int __devinit cru_detect(unsigned long map_entry,
199 unsigned long map_offset)
200{
201 void *bios32_map;
202 unsigned long *bios32_entrypoint;
203 unsigned long cru_physical_address;
204 unsigned long cru_length;
205 unsigned long physical_bios_base = 0;
206 unsigned long physical_bios_offset = 0;
207 int retval = -ENODEV;
208
209 bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
210
211 if (bios32_map == NULL)
212 return -ENODEV;
213
214 bios32_entrypoint = bios32_map + map_offset;
215
216 cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
217
218 asminline_call(&cmn_regs, bios32_entrypoint);
219
220 if (cmn_regs.u1.ral != 0) {
221 printk(KERN_WARNING
222 "hpwdt: Call succeeded but with an error: 0x%x\n",
223 cmn_regs.u1.ral);
224 } else {
225 physical_bios_base = cmn_regs.u2.rebx;
226 physical_bios_offset = cmn_regs.u4.redx;
227 cru_length = cmn_regs.u3.recx;
228 cru_physical_address =
229 physical_bios_base + physical_bios_offset;
230
231 /* If the values look OK, then map it in. */
232 if ((physical_bios_base + physical_bios_offset)) {
233 cru_rom_addr =
234 ioremap(cru_physical_address, cru_length);
235 if (cru_rom_addr)
236 retval = 0;
237 }
238
239 printk(KERN_DEBUG "hpwdt: CRU Base Address: 0x%lx\n",
240 physical_bios_base);
241 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
242 physical_bios_offset);
243 printk(KERN_DEBUG "hpwdt: CRU Length: 0x%lx\n",
244 cru_length);
245 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
246 (unsigned int)&cru_rom_addr);
247 }
248 iounmap(bios32_map);
249 return retval;
250}
251
252/*
Roland Dreier30ec9102008-02-28 12:34:42 -0800253 * bios_checksum
254 */
255static int __devinit bios_checksum(const char __iomem *ptr, int len)
256{
257 char sum = 0;
258 int i;
259
260 /*
261 * calculate checksum of size bytes. This should add up
262 * to zero if we have a valid header.
263 */
264 for (i = 0; i < len; i++)
265 sum += ptr[i];
266
267 return ((sum == 0) && (len > 0));
268}
269
270/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000271 * bios32_present
272 *
273 * Routine Description:
274 * This function finds the 32-bit BIOS Service Directory
275 *
276 * Return Value:
277 * 0 : SUCCESS
278 * <0 : FAILURE
279 */
280static int __devinit bios32_present(const char __iomem *p)
281{
282 struct bios32_service_dir *bios_32_ptr;
283 int length;
284 unsigned long map_entry, map_offset;
285
286 bios_32_ptr = (struct bios32_service_dir *) p;
287
288 /*
289 * Search for signature by checking equal to the swizzled value
290 * instead of calling another routine to perform a strcmp.
291 */
292 if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
293 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
294 if (bios_checksum(p, length)) {
295 /*
296 * According to the spec, we're looking for the
297 * first 4KB-aligned address below the entrypoint
298 * listed in the header. The Service Directory code
299 * is guaranteed to occupy no more than 2 4KB pages.
300 */
301 map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
302 map_offset = bios_32_ptr->entry_point - map_entry;
303
304 return cru_detect(map_entry, map_offset);
305 }
306 }
307 return -ENODEV;
308}
309
310static int __devinit detect_cru_service(void)
311{
312 char __iomem *p, *q;
313 int rc = -1;
314
315 /*
316 * Search from 0x0f0000 through 0x0fffff, inclusive.
317 */
318 p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
319 if (p == NULL)
320 return -ENOMEM;
321
322 for (q = p; q < p + ROM_SIZE; q += 16) {
323 rc = bios32_present(q);
324 if (!rc)
325 break;
326 }
327 iounmap(p);
328 return rc;
329}
330
331#else
332/* --64 Bit Bios------------------------------------------------------------ */
333
334#define HPWDT_ARCH 64
335
Adrian Bunk8b1266f2008-02-22 21:58:02 +0200336static void asminline_call(struct cmn_registers *pi86Regs,
337 unsigned long *pRomEntry)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000338{
339 asm("pushq %rbp \n\t"
340 "movq %rsp, %rbp \n\t"
341 "pushq %rax \n\t"
342 "pushq %rbx \n\t"
343 "pushq %rdx \n\t"
344 "pushq %r12 \n\t"
345 "pushq %r9 \n\t"
346 "movq %rsi, %r12 \n\t"
347 "movq %rdi, %r9 \n\t"
348 "movl 4(%r9),%ebx \n\t"
349 "movl 8(%r9),%ecx \n\t"
350 "movl 12(%r9),%edx \n\t"
351 "movl 16(%r9),%esi \n\t"
352 "movl 20(%r9),%edi \n\t"
353 "movl (%r9),%eax \n\t"
354 "call *%r12 \n\t"
355 "pushfq \n\t"
356 "popq %r12 \n\t"
357 "popfq \n\t"
358 "movl %eax, (%r9) \n\t"
359 "movl %ebx, 4(%r9) \n\t"
360 "movl %ecx, 8(%r9) \n\t"
361 "movl %edx, 12(%r9) \n\t"
362 "movl %esi, 16(%r9) \n\t"
363 "movl %edi, 20(%r9) \n\t"
364 "movq %r12, %rax \n\t"
365 "movl %eax, 28(%r9) \n\t"
366 "popq %r9 \n\t"
367 "popq %r12 \n\t"
368 "popq %rdx \n\t"
369 "popq %rbx \n\t"
370 "popq %rax \n\t"
371 "leave \n\t" "ret");
372}
373
374/*
375 * dmi_find_cru
376 *
377 * Routine Description:
Roland Dreier30ec9102008-02-28 12:34:42 -0800378 * This function checks whether or not a SMBIOS/DMI record is
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000379 * the 64bit CRU info or not
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000380 */
381static void __devinit dmi_find_cru(const struct dmi_header *dm)
382{
383 struct smbios_cru64_info *smbios_cru64_ptr;
384 unsigned long cru_physical_address;
385
386 if (dm->type == SMBIOS_CRU64_INFORMATION) {
387 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
388 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
389 cru_physical_address =
390 smbios_cru64_ptr->physical_address +
391 smbios_cru64_ptr->double_offset;
392 cru_rom_addr = ioremap(cru_physical_address,
393 smbios_cru64_ptr->double_length);
394 }
395 }
396}
397
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000398static int __devinit detect_cru_service(void)
399{
400 cru_rom_addr = NULL;
401
Roland Dreier30ec9102008-02-28 12:34:42 -0800402 dmi_walk(dmi_find_cru);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000403
404 /* if cru_rom_addr has been set then we found a CRU service */
405 return ((cru_rom_addr != NULL)? 0: -ENODEV);
406}
407
408/* ------------------------------------------------------------------------- */
409
410#endif
411
412/*
413 * NMI Handler
414 */
415static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
416 void *data)
417{
418 static unsigned long rom_pl;
419 static int die_nmi_called;
420
421 if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
422 return NOTIFY_OK;
423
424 spin_lock_irqsave(&rom_lock, rom_pl);
425 if (!die_nmi_called)
426 asminline_call(&cmn_regs, cru_rom_addr);
427 die_nmi_called = 1;
428 spin_unlock_irqrestore(&rom_lock, rom_pl);
429 if (cmn_regs.u1.ral == 0) {
430 printk(KERN_WARNING "hpwdt: An NMI occurred, "
431 "but unable to determine source.\n");
432 } else {
433 panic("An NMI occurred, please see the Integrated "
434 "Management Log for details.\n");
435 }
436
437 return NOTIFY_STOP;
438}
439
440/*
441 * Watchdog operations
442 */
443static void hpwdt_start(void)
444{
445 reload = (soft_margin * 1000) / 128;
446 iowrite16(reload, hpwdt_timer_reg);
447 iowrite16(0x85, hpwdt_timer_con);
448}
449
450static void hpwdt_stop(void)
451{
452 unsigned long data;
453
454 data = ioread16(hpwdt_timer_con);
455 data &= 0xFE;
456 iowrite16(data, hpwdt_timer_con);
457}
458
459static void hpwdt_ping(void)
460{
461 iowrite16(reload, hpwdt_timer_reg);
462}
463
464static int hpwdt_change_timer(int new_margin)
465{
466 /* Arbitrary, can't find the card's limits */
467 if (new_margin < 30 || new_margin > 600) {
468 printk(KERN_WARNING
469 "hpwdt: New value passed in is invalid: %d seconds.\n",
470 new_margin);
471 return -EINVAL;
472 }
473
474 soft_margin = new_margin;
475 printk(KERN_DEBUG
476 "hpwdt: New timer passed in is %d seconds.\n",
477 new_margin);
478 reload = (soft_margin * 1000) / 128;
479
480 return 0;
481}
482
483/*
484 * /dev/watchdog handling
485 */
486static int hpwdt_open(struct inode *inode, struct file *file)
487{
488 /* /dev/watchdog can only be opened once */
489 if (test_and_set_bit(0, &hpwdt_is_open))
490 return -EBUSY;
491
492 /* Start the watchdog */
493 hpwdt_start();
494 hpwdt_ping();
495
496 return nonseekable_open(inode, file);
497}
498
499static int hpwdt_release(struct inode *inode, struct file *file)
500{
501 /* Stop the watchdog */
502 if (expect_release == 42) {
503 hpwdt_stop();
504 } else {
505 printk(KERN_CRIT
506 "hpwdt: Unexpected close, not stopping watchdog!\n");
507 hpwdt_ping();
508 }
509
510 expect_release = 0;
511
512 /* /dev/watchdog is being closed, make sure it can be re-opened */
513 clear_bit(0, &hpwdt_is_open);
514
515 return 0;
516}
517
518static ssize_t hpwdt_write(struct file *file, const char __user *data,
519 size_t len, loff_t *ppos)
520{
521 /* See if we got the magic character 'V' and reload the timer */
522 if (len) {
523 if (!nowayout) {
524 size_t i;
525
526 /* note: just in case someone wrote the magic character
527 * five months ago... */
528 expect_release = 0;
529
530 /* scan to see whether or not we got the magic char. */
531 for (i = 0; i != len; i++) {
532 char c;
533 if (get_user(c, data+i))
534 return -EFAULT;
535 if (c == 'V')
536 expect_release = 42;
537 }
538 }
539
540 /* someone wrote to us, we should reload the timer */
541 hpwdt_ping();
542 }
543
544 return len;
545}
546
547static struct watchdog_info ident = {
548 .options = WDIOF_SETTIMEOUT |
549 WDIOF_KEEPALIVEPING |
550 WDIOF_MAGICCLOSE,
551 .identity = "HP iLO2 HW Watchdog Timer",
552};
553
554static long hpwdt_ioctl(struct file *file, unsigned int cmd,
555 unsigned long arg)
556{
557 void __user *argp = (void __user *)arg;
558 int __user *p = argp;
559 int new_margin;
560 int ret = -ENOTTY;
561
562 switch (cmd) {
563 case WDIOC_GETSUPPORT:
564 ret = 0;
565 if (copy_to_user(argp, &ident, sizeof(ident)))
566 ret = -EFAULT;
567 break;
568
569 case WDIOC_GETSTATUS:
570 case WDIOC_GETBOOTSTATUS:
571 ret = put_user(0, p);
572 break;
573
574 case WDIOC_KEEPALIVE:
575 hpwdt_ping();
576 ret = 0;
577 break;
578
579 case WDIOC_SETTIMEOUT:
580 ret = get_user(new_margin, p);
581 if (ret)
582 break;
583
584 ret = hpwdt_change_timer(new_margin);
585 if (ret)
586 break;
587
588 hpwdt_ping();
589 /* Fall */
590 case WDIOC_GETTIMEOUT:
591 ret = put_user(soft_margin, p);
592 break;
593 }
594 return ret;
595}
596
597/*
598 * Kernel interfaces
599 */
600static struct file_operations hpwdt_fops = {
601 .owner = THIS_MODULE,
602 .llseek = no_llseek,
603 .write = hpwdt_write,
604 .unlocked_ioctl = hpwdt_ioctl,
605 .open = hpwdt_open,
606 .release = hpwdt_release,
607};
608
609static struct miscdevice hpwdt_miscdev = {
610 .minor = WATCHDOG_MINOR,
611 .name = "watchdog",
612 .fops = &hpwdt_fops,
613};
614
615static struct notifier_block die_notifier = {
616 .notifier_call = hpwdt_pretimeout,
617 .priority = 0x7FFFFFFF,
618};
619
620/*
621 * Init & Exit
622 */
623
624static int __devinit hpwdt_init_one(struct pci_dev *dev,
625 const struct pci_device_id *ent)
626{
627 int retval;
628
629 /*
630 * First let's find out if we are on an iLO2 server. We will
631 * not run on a legacy ASM box.
632 */
633 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
634 dev_warn(&dev->dev,
635 "This server does not have an iLO2 ASIC.\n");
636 return -ENODEV;
637 }
638
639 if (pci_enable_device(dev)) {
640 dev_warn(&dev->dev,
641 "Not possible to enable PCI Device: 0x%x:0x%x.\n",
642 ent->vendor, ent->device);
643 return -ENODEV;
644 }
645
646 pci_mem_addr = pci_iomap(dev, 1, 0x80);
647 if (!pci_mem_addr) {
648 dev_warn(&dev->dev,
649 "Unable to detect the iLO2 server memory.\n");
650 retval = -ENOMEM;
651 goto error_pci_iomap;
652 }
653 hpwdt_timer_reg = pci_mem_addr + 0x70;
654 hpwdt_timer_con = pci_mem_addr + 0x72;
655
656 /* Make sure that we have a valid soft_margin */
657 if (hpwdt_change_timer(soft_margin))
658 hpwdt_change_timer(DEFAULT_MARGIN);
659
660 /*
661 * We need to map the ROM to get the CRU service.
662 * For 32 bit Operating Systems we need to go through the 32 Bit
663 * BIOS Service Directory
664 * For 64 bit Operating Systems we get that service through SMBIOS.
665 */
666 retval = detect_cru_service();
667 if (retval < 0) {
668 dev_warn(&dev->dev,
669 "Unable to detect the %d Bit CRU Service.\n",
670 HPWDT_ARCH);
671 goto error_get_cru;
672 }
673
674 /*
675 * We know this is the only CRU call we need to make so lets keep as
676 * few instructions as possible once the NMI comes in.
677 */
678 cmn_regs.u1.rah = 0x0D;
679 cmn_regs.u1.ral = 0x02;
680
681 retval = register_die_notifier(&die_notifier);
682 if (retval != 0) {
683 dev_warn(&dev->dev,
684 "Unable to register a die notifier (err=%d).\n",
685 retval);
686 goto error_die_notifier;
687 }
688
689 retval = misc_register(&hpwdt_miscdev);
690 if (retval < 0) {
691 dev_warn(&dev->dev,
692 "Unable to register miscdev on minor=%d (err=%d).\n",
693 WATCHDOG_MINOR, retval);
694 goto error_misc_register;
695 }
696
697 printk(KERN_INFO
698 "hp Watchdog Timer Driver: 1.00"
699 ", timer margin: %d seconds( nowayout=%d).\n",
700 soft_margin, nowayout);
701
702 return 0;
703
704error_misc_register:
705 unregister_die_notifier(&die_notifier);
706error_die_notifier:
707 if (cru_rom_addr)
708 iounmap(cru_rom_addr);
709error_get_cru:
710 pci_iounmap(dev, pci_mem_addr);
711error_pci_iomap:
712 pci_disable_device(dev);
713 return retval;
714}
715
716static void __devexit hpwdt_exit(struct pci_dev *dev)
717{
718 if (!nowayout)
719 hpwdt_stop();
720
721 misc_deregister(&hpwdt_miscdev);
722 unregister_die_notifier(&die_notifier);
723
724 if (cru_rom_addr)
725 iounmap(cru_rom_addr);
726 pci_iounmap(dev, pci_mem_addr);
727 pci_disable_device(dev);
728}
729
730static struct pci_driver hpwdt_driver = {
731 .name = "hpwdt",
732 .id_table = hpwdt_devices,
733 .probe = hpwdt_init_one,
734 .remove = __devexit_p(hpwdt_exit),
735};
736
737static void __exit hpwdt_cleanup(void)
738{
739 pci_unregister_driver(&hpwdt_driver);
740}
741
742static int __init hpwdt_init(void)
743{
744 return pci_register_driver(&hpwdt_driver);
745}
746
747MODULE_AUTHOR("Tom Mingarelli");
748MODULE_DESCRIPTION("hp watchdog driver");
749MODULE_LICENSE("GPL");
750MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
751
752module_param(soft_margin, int, 0);
753MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
754
755module_param(nowayout, int, 0);
756MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
757 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
758
759module_init(hpwdt_init);
760module_exit(hpwdt_cleanup);