aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/generic-2.6/patches-2.6.30/029-mips_kexec.patch
blob: 9273f70ba41dda6edb7f8d059c635e9c784002fd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
This patch updates kernel part of kexec for MIPS platform to support
kdump, 64-bit, SMP and simplify code adaptation to new boards. It does
the following:

- hooks for machine-specific actions are introduced
(_machine_kexec_prepare,
  _machine_kexec_shutdown, _machine_crash_shutdown);
- kexec reboot on SMP machine is implemented;
- add boot parameters passing to new kernel (array kexec_args[] is
copied to
  registers a0-a3 on reboot );
- crash dump functionality is added (boot kernel with non-default physical
  start, parse "crashkernel=..." command line parameter, copy_oldmem_page()
  is implemeted to read memory dump after reboot-on-crashi,
crash_setup_regs()
  is updated to correctly store registers on crash);

kexec/kdump funtionality was tested on several Cavium Octeon boards
(mips64 SMP). The way we do it was the following:
- _machine_kexec_prepare was find kexec segment with command line and
save it's pointed into internal bootloader structure.
- _machine_kexec_shutdown was used to stop boards IO and make all non-boot
CPUs spin in function relocated_kexec_smp_wait()
- _machine_crash_shutdown just calls default_machine_crash_shutdown()
We tested 1) 'common' kexec reboot (by 'kexec -e'), 2) kexec-on-panic
('kexec -p ...') and 3) access to/proc/vmcore (with gdb).

Signed-off-by: Maxim Syrchin <[11]msyrchin at ru.mvista.com>
---
arch/mips/Kconfig                  |   23 +++++++++
arch/mips/Makefile                 |    4 ++
arch/mips/kernel/Makefile          |    3 +-
arch/mips/kernel/crash.c           |   91 ++++++++++++++++++++++++++++++++++
arch/mips/kernel/crash_dump.c      |   96 ++++++++++++++++++++++++++++++++++++
arch/mips/kernel/machine_kexec.c   |   52 ++++++++++++++++++-
arch/mips/kernel/relocate_kernel.S |   93 ++++++++++++++++++++++++++++++++++-
arch/mips/kernel/setup.c           |   10 +++-
arch/mips/include/asm/kexec.h           |   21 ++++++++-
9 files changed, 386 insertions(+), 7 deletions(-)
create mode 100644 arch/mips/kernel/crash.c
create mode 100644 arch/mips/kernel/crash_dump.c

---
 arch/mips/Kconfig                  |   23 	23 +	0 -	0 !
 arch/mips/Makefile                 |    4 	4 +	0 -	0 !
 arch/mips/kernel/Makefile          |    3 	2 +	1 -	0 !
 arch/mips/kernel/crash.c           |   90 	90 +	0 -	0 !
 arch/mips/kernel/crash_dump.c      |   96 	96 +	0 -	0 !
 arch/mips/kernel/machine_kexec.c   |   66 	60 +	6 -	0 !
 arch/mips/kernel/relocate_kernel.S |   96 	95 +	1 -	0 !
 arch/mips/kernel/setup.c           |   10 	9 +	1 -	0 !
 arch/mips/include/asm/kexec.h      |   21 	20 +	1 -	0 !
 9 files changed, 399 insertions(+), 10 deletions(-)

Index: linux-2.6.30.7/arch/mips/Kconfig
===================================================================
--- linux-2.6.30.7.orig/arch/mips/Kconfig	2009-09-27 20:41:06.000000000 +0200
+++ linux-2.6.30.7/arch/mips/Kconfig	2009-09-27 21:02:55.000000000 +0200
@@ -1966,6 +1966,29 @@
 	  support.  As of this writing the exact hardware interface is
 	  strongly in flux, so no good recommendation can be made.
 
+config CRASH_DUMP
+    bool "kernel crash dumps (EXPERIMENTAL)"
+    depends on EXPERIMENTAL
+    help
+      Generate crash dump after being started by kexec.
+          This should be normally only set in special crash dump kernels
+      which are loaded in the main kernel with kexec-tools into
+      a specially reserved region and then later executed after
+      a crash by kdump/kexec. The crash dump kernel must be compiled
+          to a memory address not used by the main kernel or BIOS using
+          PHYSICAL_START.
+
+config PHYSICAL_START
+    hex "Physical address where the kernel is loaded"
+    default "0xffffffff84000000"
+    depends on CRASH_DUMP
+    help
+      This gives the CKSEG0 or KSEG0 address where the kernel is loaded.
+      If you plan to use kernel for capturing the crash dump change
+      this value to start of the reserved region (the "X" value as
+      specified in the "crashkernel=[12]YM at XM" command line boot parameter
+      passed to the panic-ed kernel).
+
 config SECCOMP
 	bool "Enable seccomp to safely compute untrusted bytecode"
 	depends on PROC_FS
Index: linux-2.6.30.7/arch/mips/Makefile
===================================================================
--- linux-2.6.30.7.orig/arch/mips/Makefile	2009-09-27 20:41:07.000000000 +0200
+++ linux-2.6.30.7/arch/mips/Makefile	2009-09-27 21:03:31.000000000 +0200
@@ -603,6 +603,10 @@
 load-$(CONFIG_CPU_CAVIUM_OCTEON) 	+= 0xffffffff81100000
 endif
 
+ifdef CONFIG_PHYSICAL_START
+load-y			= $(CONFIG_PHYSICAL_START)
+endif
+
 cflags-y			+= -I$(srctree)/arch/mips/include/asm/mach-generic
 drivers-$(CONFIG_PCI)		+= arch/mips/pci/
 
Index: linux-2.6.30.7/arch/mips/kernel/Makefile
===================================================================
--- linux-2.6.30.7.orig/arch/mips/kernel/Makefile	2009-09-27 20:41:06.000000000 +0200
+++ linux-2.6.30.7/arch/mips/kernel/Makefile	2009-09-27 21:02:55.000000000 +0200
@@ -83,7 +83,8 @@
 
 obj-$(CONFIG_GPIO_TXX9)		+= gpio_txx9.o
 
-obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel.o
+obj-$(CONFIG_KEXEC)        += machine_kexec.o relocate_kernel.o crash.o
+obj-$(CONFIG_CRASH_DUMP)    += crash_dump.o
 obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 obj-$(CONFIG_MIPS_MACHINE)	+= mips_machine.o
 
Index: linux-2.6.30.7/arch/mips/kernel/crash.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.7/arch/mips/kernel/crash.c	2009-09-27 21:02:55.000000000 +0200
@@ -0,0 +1,90 @@
+/*
+ * Architecture specific (MIPS) functions for kexec based crash dumps.
+ *
+ * Copyright (C) 2005, IBM Corp.
+ * Copyright (C) 2008, MontaVista Software Inc.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/reboot.h>
+#include <linux/kexec.h>
+#include <linux/bootmem.h>
+#include <linux/crash_dump.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+
+
+
+/* This keeps a track of which one is crashing cpu. */
+int crashing_cpu = -1;
+static cpumask_t cpus_in_crash = CPU_MASK_NONE;
+
+#ifdef CONFIG_SMP
+
+void crash_shutdown_secondary(void *ignore)
+{
+    struct pt_regs* regs;
+    int cpu = smp_processor_id();
+
+    regs = task_pt_regs(current);
+    if (!cpu_online(cpu))
+        return;
+
+    local_irq_disable();
+    if (!cpu_isset(cpu, cpus_in_crash))
+        crash_save_cpu(regs, cpu);
+    cpu_set(cpu, cpus_in_crash);
+
+    while(!atomic_read(&kexec_ready_to_reboot)) {
+        cpu_relax();
+    }
+    relocated_kexec_smp_wait(NULL);
+    /* NOTREACHED */
+}
+
+static void crash_kexec_prepare_cpus(void)
+{
+    unsigned int msecs;
+
+    unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
+
+    smp_call_function (crash_shutdown_secondary, NULL, 0, 0);
+    smp_wmb();
+
+    /*
+     * FIXME: Until we will have the way to stop other CPUSs reliabally,
+     * the crash CPU will send an IPI and wait for other CPUs to
+     * respond.
+     * Delay of at least 10 seconds.
+     */
+    printk(KERN_EMERG "Sending IPI to other cpus...\n");
+    msecs = 10000;
+    while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
+        cpu_relax();
+        mdelay(1);
+    }
+
+}
+
+#else
+static void crash_kexec_prepare_cpus(void) {}
+#endif
+
+void default_machine_crash_shutdown(struct pt_regs *regs)
+{
+    local_irq_disable();
+    crashing_cpu = smp_processor_id();
+    crash_save_cpu(regs, crashing_cpu);
+    crash_kexec_prepare_cpus();
+    cpu_set(crashing_cpu, cpus_in_crash);
+}
Index: linux-2.6.30.7/arch/mips/kernel/crash_dump.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.7/arch/mips/kernel/crash_dump.c	2009-09-27 21:02:55.000000000 +0200
@@ -0,0 +1,96 @@
+/*
+ * Routines for doing kexec-based kdump.
+ *
+ * Copyright (C) 2005, IBM Corp.
+ * Copyright (C) 2008, MontaVista Software Inc.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+
+#include <linux/highmem.h>
+#include <linux/bootmem.h>
+#include <linux/crash_dump.h>
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_PROC_VMCORE
+static int __init parse_elfcorehdr(char *p)
+{
+    if (p)
+        elfcorehdr_addr = memparse(p, &p);
+    return 1;
+}
+__setup("elfcorehdr=", parse_elfcorehdr);
+#endif
+
+static int __init parse_savemaxmem(char *p)
+{
+    if (p)
+        saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1;
+
+    return 1;
+}
+__setup("savemaxmem=", parse_savemaxmem);
+
+
+static void *kdump_buf_page;
+
+/**
+ * copy_oldmem_page - copy one page from "oldmem"
+ * @pfn: page frame number to be copied
+ * @buf: target memory address for the copy; this can be in kernel address
+ *    space or user address space (see @userbuf)
+ * @csize: number of bytes to copy
+ * @offset: offset in bytes into the page (based on pfn) to begin the copy
+ * @userbuf: if set, @buf is in user address space, use copy_to_user(),
+ *    otherwise @buf is in kernel address space, use memcpy().
+ *
+ * Copy a page from "oldmem". For this page, there is no pte mapped
+ * in the current kernel.
+ *
+ * Calling copy_to_user() in atomic context is not desirable. Hence first
+ * copying the data to a pre-allocated kernel page and then copying to user
+ * space in non-atomic context.
+ */
+ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
+                               size_t csize, unsigned long offset, int userbuf)
+{
+    void  *vaddr;
+
+    if (!csize)
+        return 0;
+
+    vaddr = kmap_atomic_pfn(pfn, KM_PTE0);
+
+    if (!userbuf) {
+        memcpy(buf, (vaddr + offset), csize);
+        kunmap_atomic(vaddr, KM_PTE0);
+    } else {
+        if (!kdump_buf_page) {
+            printk(KERN_WARNING "Kdump: Kdump buffer page not"
+                " allocated\n");
+            return -EFAULT;
+        }
+        copy_page(kdump_buf_page, vaddr);
+        kunmap_atomic(vaddr, KM_PTE0);
+        if (copy_to_user(buf, (kdump_buf_page + offset), csize))
+            return -EFAULT;
+    }
+
+    return csize;
+}
+
+static int __init kdump_buf_page_init(void)
+{
+    int ret = 0;
+
+    kdump_buf_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
+    if (!kdump_buf_page) {
+        printk(KERN_WARNING "Kdump: Failed to allocate kdump buffer"
+             " page\n");
+        ret = -ENOMEM;
+    }
+
+    return ret;
+}
+arch_initcall(kdump_buf_page_init);
Index: linux-2.6.30.7/arch/mips/kernel/machine_kexec.c
===================================================================
--- linux-2.6.30.7.orig/arch/mips/kernel/machine_kexec.c	2009-09-15 19:46:05.000000000 +0200
+++ linux-2.6.30.7/arch/mips/kernel/machine_kexec.c	2009-09-27 21:02:55.000000000 +0200
@@ -19,9 +19,25 @@
 extern unsigned long kexec_start_address;
 extern unsigned long kexec_indirection_page;
 
+extern unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
+
+int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+void (*_machine_kexec_shutdown)(void) = NULL;
+void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
+#ifdef CONFIG_SMP
+void (*relocated_kexec_smp_wait) (void *);
+atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
+#endif
+
 int
 machine_kexec_prepare(struct kimage *kimage)
 {
+	kexec_args[0] = fw_arg0;
+	kexec_args[1] = fw_arg1;
+	kexec_args[2] = fw_arg2;
+	kexec_args[3] = fw_arg3;
+	if (_machine_kexec_prepare)
+        	return _machine_kexec_prepare(kimage);
 	return 0;
 }
 
@@ -33,13 +49,18 @@
 void
 machine_shutdown(void)
 {
+    if (_machine_kexec_shutdown)
+        _machine_kexec_shutdown();
 }
 
 void
 machine_crash_shutdown(struct pt_regs *regs)
 {
+    if (_machine_crash_shutdown)
+        _machine_crash_shutdown(regs);
+    else
+        default_machine_crash_shutdown(regs);
 }
-
 typedef void (*noretfun_t)(void) __attribute__((noreturn));
 
 void
@@ -52,7 +73,9 @@
 	reboot_code_buffer =
 	  (unsigned long)page_address(image->control_code_page);
 
-	kexec_start_address = image->start;
+     kexec_start_address =
+        (unsigned long) phys_to_virt(image->start);
+
 	kexec_indirection_page =
 		(unsigned long) phys_to_virt(image->head & PAGE_MASK);
 
@@ -63,7 +86,7 @@
 	 * The generic kexec code builds a page list with physical
 	 * addresses. they are directly accessible through KSEG0 (or
 	 * CKSEG0 or XPHYS if on 64bit system), hence the
-	 * pys_to_virt() call.
+     * phys_to_virt() call.
 	 */
 	for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
 	     ptr = (entry & IND_INDIRECTION) ?
@@ -78,8 +101,39 @@
 	 */
 	local_irq_disable();
 
-	printk("Will call new kernel at %08lx\n", image->start);
-	printk("Bye ...\n");
+	printk(KERN_EMERG "Will call new kernel at %08lx\n", image->start);
+	printk(KERN_EMERG "Bye ...\n");
 	__flush_cache_all();
-	((noretfun_t) reboot_code_buffer)();
+#ifdef CONFIG_SMP
+    /* All secondary cpus now may jump to kexec_wait cycle */
+    relocated_kexec_smp_wait = (void *)(reboot_code_buffer +
+        (kexec_smp_wait - relocate_new_kernel));
+    smp_wmb();
+    atomic_set(&kexec_ready_to_reboot,1);
+#endif
+
+    	((noretfun_t) reboot_code_buffer)();
+	printk(KERN_EMERG "Bye ...\n");
+}
+
+/* crashkernel=[13]size at addr specifies the location to reserve for
+ * a crash kernel.  By reserving this memory we guarantee
+ * that linux never sets it up as a DMA target.
+ * Useful for holding code to do something appropriate
+ * after a kernel panic.
+ */
+static int __init parse_crashkernel_cmdline(char *arg)
+{
+    unsigned long size, base;
+    size = memparse(arg, &arg);
+    if (*arg == '@') {
+        base = memparse(arg+1, &arg);
+        /* FIXME: Do I want a sanity check
+         * to validate the memory range?
+         */
+        crashk_res.start = base;
+        crashk_res.end   = base + size - 1;
+    }
+    return 0;
 }
+early_param("crashkernel", parse_crashkernel_cmdline);
Index: linux-2.6.30.7/arch/mips/kernel/relocate_kernel.S
===================================================================
--- linux-2.6.30.7.orig/arch/mips/kernel/relocate_kernel.S	2009-09-15 19:46:05.000000000 +0200
+++ linux-2.6.30.7/arch/mips/kernel/relocate_kernel.S	2009-09-27 21:02:55.000000000 +0200
@@ -14,7 +14,13 @@
 #include <asm/stackframe.h>
 #include <asm/addrspace.h>
 
+
 LEAF(relocate_new_kernel)
+     PTR_L a0,    arg0
+     PTR_L a1,    arg1
+     PTR_L a2,    arg2
+     PTR_L a3,    arg3
+
 	PTR_L		s0, kexec_indirection_page
 	PTR_L		s1, kexec_start_address
 
@@ -26,7 +32,6 @@
 	and		s3, s2, 0x1
 	beq		s3, zero, 1f
 	and		s4, s2, ~0x1	/* store destination addr in s4 */
-	move		a0, s4
 	b		process_entry
 
 1:
@@ -40,6 +45,7 @@
 	/* done page */
 	and		s3, s2, 0x4
 	beq		s3, zero, 1f
+	nop
 	b		done
 1:
 	/* source page */
@@ -56,14 +62,102 @@
 	PTR_ADD		s2, s2, SZREG
 	LONG_SUB	s6, s6, 1
 	beq		s6, zero, process_entry
+	nop
 	b		copy_word
+	nop
 	b		process_entry
 
 done:
+#ifdef CONFIG_SMP
+    /* kexec_flag reset is signal to other CPUs what kernel
+        was moved to it's location. Note - we need relocated address
+        of kexec_flag.  */
+
+     bal        1f
+ 1:     move        t1,ra;
+     PTR_LA        t2,1b
+     PTR_LA        t0,kexec_flag
+     PTR_SUB        t0,t0,t2;
+     PTR_ADD        t0,t1,t0;
+     LONG_S        zero,(t0)
+#endif
+
+     /* Some platforms need I-cache to be flushed before
+     * jumping to new kernel.
+      */
+
 	/* jump to kexec_start_address */
 	j		s1
 	END(relocate_new_kernel)
 
+#ifdef CONFIG_SMP
+/*
+ * Other CPUs should wait until code is relocated and
+ * then start at entry point.
+ */
+LEAF(kexec_smp_wait)
+    PTR_L        a0, s_arg0
+    PTR_L        a1, s_arg1
+    PTR_L        a2, s_arg2
+    PTR_L        a3, s_arg3
+    PTR_L        s1, kexec_start_address
+
+    /* Non-relocated address works for args and kexec_start_address ( old
+     * kernel is not overwritten). But we need relocated address of
+     * kexec_flag.
+     */
+
+    bal        1f
+1:    move        t1,ra;
+    PTR_LA        t2,1b
+    PTR_LA        t0,kexec_flag
+    PTR_SUB        t0,t0,t2;
+    PTR_ADD        t0,t1,t0;
+
+1:    LONG_L        s0, (t0)
+    bne        s0, zero,1b
+
+    j        s1
+    END(kexec_smp_wait)
+#endif
+
+
+#ifdef __mips64
+       /* all PTR's must be aligned to 8 byte in 64-bit mode */
+       .align  3
+#endif
+
+/* All parameters to new kernel are passed in registers a0-a3.
+ * kexec_args[0..3] are uses to prepare register values.
+ */
+
+kexec_args:
+    EXPORT(kexec_args)
+arg0:    PTR        0x0
+arg1:    PTR        0x0
+arg2:    PTR        0x0
+arg3:    PTR        0x0
+    .size    kexec_args,PTRSIZE*4
+
+#ifdef CONFIG_SMP
+/*
+ * Secondary CPUs may have different kernel parameters in
+ * their registers a0-a3. secondary_kexec_args[0..3] are used
+ * to prepare register values.
+ */
+secondary_kexec_args:
+    EXPORT(secondary_kexec_args)
+s_arg0:    PTR        0x0
+s_arg1:    PTR        0x0
+s_arg2:    PTR        0x0
+s_arg3:    PTR        0x0
+    .size    secondary_kexec_args,PTRSIZE*4
+kexec_flag:
+    LONG        0x1
+
+#endif
+
+
 kexec_start_address:
 	EXPORT(kexec_start_address)
 	PTR		0x0
Index: linux-2.6.30.7/arch/mips/kernel/setup.c
===================================================================
--- linux-2.6.30.7.orig/arch/mips/kernel/setup.c	2009-09-15 19:46:05.000000000 +0200
+++ linux-2.6.30.7/arch/mips/kernel/setup.c	2009-09-27 21:02:55.000000000 +0200
@@ -21,7 +21,7 @@
 #include <linux/console.h>
 #include <linux/pfn.h>
 #include <linux/debugfs.h>
-
+#include <linux/kexec.h>
 #include <asm/addrspace.h>
 #include <asm/bootinfo.h>
 #include <asm/bugs.h>
@@ -489,6 +489,11 @@
 	}
 
 	bootmem_init();
+#ifdef CONFIG_CRASH_DUMP
+    if (crashk_res.start != crashk_res.end)
+        reserve_bootmem(crashk_res.start,
+                crashk_res.end - crashk_res.start + 1);
+#endif
 	sparse_init();
 	paging_init();
 }
@@ -543,6 +548,9 @@
 		 */
 		request_resource(res, &code_resource);
 		request_resource(res, &data_resource);
+#ifdef CONFIG_KEXEC
+        request_resource(res, &crashk_res);
+#endif
 	}
 }
 
Index: linux-2.6.30.7/arch/mips/include/asm/kexec.h
===================================================================
--- linux-2.6.30.7.orig/arch/mips/include/asm/kexec.h	2009-09-15 19:46:05.000000000 +0200
+++ linux-2.6.30.7/arch/mips/include/asm/kexec.h	2009-09-27 21:02:55.000000000 +0200
@@ -9,6 +9,8 @@
 #ifndef _MIPS_KEXEC
 # define _MIPS_KEXEC
 
+#include <asm/stacktrace.h>
+
 /* Maximum physical address we can use pages from */
 #define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
 /* Maximum address we can reach in physical address mode */
@@ -24,7 +26,24 @@
 static inline void crash_setup_regs(struct pt_regs *newregs,
 				    struct pt_regs *oldregs)
 {
-	/* Dummy implementation for now */
+    if (oldregs)
+        memcpy(newregs, oldregs, sizeof(*newregs));
+    else
+        prepare_frametrace(newregs);
 }
 
+#ifdef CONFIG_KEXEC
+struct kimage;
+extern unsigned long kexec_args[4];
+extern int (*_machine_kexec_prepare)(struct kimage *);
+extern void (*_machine_kexec_shutdown)(void);
+extern void (*_machine_crash_shutdown)(struct pt_regs *regs);
+extern void default_machine_crash_shutdown(struct pt_regs *regs);
+#ifdef CONFIG_SMP
+extern const unsigned char kexec_smp_wait[];
+extern unsigned long secondary_kexec_args[4];
+extern void (*relocated_kexec_smp_wait) (void *);
+extern atomic_t kexec_ready_to_reboot;
+#endif
+#endif
 #endif /* !_MIPS_KEXEC */