summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/osl.c
blob: 20c9a37643c73110f0e18fd5efef989906d2bf14 (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
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
/*
 *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
 *
 *  Copyright (C) 2000       Andrew Henroid
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/kmod.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/nmi.h>
#include <acpi/acpi.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/processor.h>
#include <asm/uaccess.h>

#include <linux/efi.h>

#define _COMPONENT		ACPI_OS_SERVICES
ACPI_MODULE_NAME("osl")
#define PREFIX		"ACPI: "
struct acpi_os_dpc {
	acpi_osd_exec_callback function;
	void *context;
};

#ifdef CONFIG_ACPI_CUSTOM_DSDT
#include CONFIG_ACPI_CUSTOM_DSDT_FILE
#endif

#ifdef ENABLE_DEBUGGER
#include <linux/kdb.h>

/* stuff for debugger support */
int acpi_in_debugger;
EXPORT_SYMBOL(acpi_in_debugger);

extern char line_buf[80];
#endif				/*ENABLE_DEBUGGER */

int acpi_specific_hotkey_enabled = TRUE;
EXPORT_SYMBOL(acpi_specific_hotkey_enabled);

static unsigned int acpi_irq_irq;
static acpi_osd_handler acpi_irq_handler;
static void *acpi_irq_context;
static struct workqueue_struct *kacpid_wq;

acpi_status acpi_os_initialize(void)
{
	return AE_OK;
}

acpi_status acpi_os_initialize1(void)
{
	/*
	 * Initialize PCI configuration space access, as we'll need to access
	 * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
	 */
	if (!raw_pci_ops) {
		printk(KERN_ERR PREFIX
		       "Access to PCI configuration space unavailable\n");
		return AE_NULL_ENTRY;
	}
	kacpid_wq = create_singlethread_workqueue("kacpid");
	BUG_ON(!kacpid_wq);

	return AE_OK;
}

acpi_status acpi_os_terminate(void)
{
	if (acpi_irq_handler) {
		acpi_os_remove_interrupt_handler(acpi_irq_irq,
						 acpi_irq_handler);
	}

	destroy_workqueue(kacpid_wq);

	return AE_OK;
}

void acpi_os_printf(const char *fmt, ...)
{
	va_list args;
	va_start(args, fmt);
	acpi_os_vprintf(fmt, args);
	va_end(args);
}

EXPORT_SYMBOL(acpi_os_printf);

void acpi_os_vprintf(const char *fmt, va_list args)
{
	static char buffer[512];

	vsprintf(buffer, fmt, args);

#ifdef ENABLE_DEBUGGER
	if (acpi_in_debugger) {
		kdb_printf("%s", buffer);
	} else {
		printk("%s", buffer);
	}
#else
	printk("%s", buffer);
#endif
}

extern int acpi_in_resume;
void *acpi_os_allocate(acpi_size size)
{
	if (acpi_in_resume)
		return kmalloc(size, GFP_ATOMIC);
	else
		return kmalloc(size, GFP_KERNEL);
}

void acpi_os_free(void *ptr)
{
	kfree(ptr);
}

EXPORT_SYMBOL(acpi_os_free);

acpi_status acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
{
	if (efi_enabled) {
		addr->pointer_type = ACPI_PHYSICAL_POINTER;
		if (efi.acpi20)
			addr->pointer.physical =
			    (acpi_physical_address) virt_to_phys(efi.acpi20);
		else if (efi.acpi)
			addr->pointer.physical =
			    (acpi_physical_address) virt_to_phys(efi.acpi);
		else {
			printk(KERN_ERR PREFIX
			       "System description tables not found\n");
			return AE_NOT_FOUND;
		}
	} else {
		if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
			printk(KERN_ERR PREFIX
			       "System description tables not found\n");
			return AE_NOT_FOUND;
		}
	}

	return AE_OK;
}

acpi_status
acpi_os_map_memory(acpi_physical_address phys, acpi_size size,
		   void __iomem ** virt)
{
	if (efi_enabled) {
		if (EFI_MEMORY_WB & efi_mem_attributes(phys)) {
			*virt = (void __iomem *)phys_to_virt(phys);
		} else {
			*virt = ioremap(phys, size);
		}
	} else {
		if (phys > ULONG_MAX) {
			printk(KERN_ERR PREFIX "Cannot map memory that high\n");
			return AE_BAD_PARAMETER;
		}
		/*
		 * ioremap checks to ensure this is in reserved space
		 */
		*virt = ioremap((unsigned long)phys, size);
	}

	if (!*virt)
		return AE_NO_MEMORY;

	return AE_OK;
}
EXPORT_SYMBOL_GPL(acpi_os_map_memory);

void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
{
	iounmap(virt);
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);

#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
{
	if (!phys || !virt)
		return AE_BAD_PARAMETER;

	*phys = virt_to_phys(virt);

	return AE_OK;
}
#endif

#define ACPI_MAX_OVERRIDE_LEN 100

static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];

acpi_status
acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
			    acpi_string * new_val)
{
	if (!init_val || !new_val)
		return AE_BAD_PARAMETER;

	*new_val = NULL;
	if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
		printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
		       acpi_os_name);
		*new_val = acpi_os_name;
	}

	return AE_OK;
}

acpi_status
acpi_os_table_override(struct acpi_table_header * existing_table,
		       struct acpi_table_header ** new_table)
{
	if (!existing_table || !new_table)
		return AE_BAD_PARAMETER;

#ifdef CONFIG_ACPI_CUSTOM_DSDT
	if (strncmp(existing_table->signature, "DSDT", 4) == 0)
		*new_table = (struct acpi_table_header *)AmlCode;
	else
		*new_table = NULL;
#else
	*new_table = NULL;
#endif
	return AE_OK;
}

static irqreturn_t acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
{
	return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
}

acpi_status
acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
				  void *context)
{
	unsigned int irq;

	/*
	 * Ignore the GSI from the core, and use the value in our copy of the
	 * FADT. It may not be the same if an interrupt source override exists
	 * for the SCI.
	 */
	gsi = acpi_fadt.sci_int;
	if (acpi_gsi_to_irq(gsi, &irq) < 0) {
		printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
		       gsi);
		return AE_OK;
	}

	acpi_irq_handler = handler;
	acpi_irq_context = context;
	if (request_irq(irq, acpi_irq, SA_SHIRQ, "acpi", acpi_irq)) {
		printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
		return AE_NOT_ACQUIRED;
	}
	acpi_irq_irq = irq;

	return AE_OK;
}

acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
{
	if (irq) {
		free_irq(irq, acpi_irq);
		acpi_irq_handler = NULL;
		acpi_irq_irq = 0;
	}

	return AE_OK;
}

/*
 * Running in interpreter thread context, safe to sleep
 */

void acpi_os_sleep(acpi_integer ms)
{
	schedule_timeout_interruptible(msecs_to_jiffies(ms));
}

EXPORT_SYMBOL(acpi_os_sleep);

void acpi_os_stall(u32 us)
{
	while (us) {
		u32 delay = 1000;

		if (delay > us)
			delay = us;
		udelay(delay);
		touch_nmi_watchdog();
		us -= delay;
	}
}

EXPORT_SYMBOL(acpi_os_stall);

/*
 * Support ACPI 3.0 AML Timer operand
 * Returns 64-bit free-running, monotonically increasing timer
 * with 100ns granularity
 */
u64 acpi_os_get_timer(void)
{
	static u64 t;

#ifdef	CONFIG_HPET
	/* TBD: use HPET if available */
#endif

#ifdef	CONFIG_X86_PM_TIMER
	/* TBD: default to PM timer if HPET was not available */
#endif
	if (!t)
		printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");

	return ++t;
}

acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
{
	u32 dummy;

	if (!value)
		value = &dummy;

	switch (width) {
	case 8:
		*(u8 *) value = inb(port);
		break;
	case 16:
		*(u16 *) value = inw(port);
		break;
	case 32:
		*(u32 *) value = inl(port);
		break;
	default:
		BUG();
	}

	return AE_OK;
}

EXPORT_SYMBOL(acpi_os_read_port);

acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
{
	switch (width) {
	case 8:
		outb(value, port);
		break;
	case 16:
		outw(value, port);
		break;
	case 32:
		outl(value, port);
		break;
	default:
		BUG();
	}

	return AE_OK;
}

EXPORT_SYMBOL(acpi_os_write_port);

acpi_status
acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
{
	u32 dummy;
	void __iomem *virt_addr;
	int iomem = 0;

	if (efi_enabled) {
		if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
			/* HACK ALERT! We can use readb/w/l on real memory too.. */
			virt_addr = (void __iomem *)phys_to_virt(phys_addr);
		} else {
			iomem = 1;
			virt_addr = ioremap(phys_addr, width);
		}
	} else
		virt_addr = (void __iomem *)phys_to_virt(phys_addr);
	if (!value)
		value = &dummy;

	switch (width) {
	case 8:
		*(u8 *) value = readb(virt_addr);
		break;
	case 16:
		*(u16 *) value = readw(virt_addr);
		break;
	case 32:
		*(u32 *) value = readl(virt_addr);
		break;
	default:
		BUG();
	}

	if (efi_enabled) {
		if (iomem)
			iounmap(virt_addr);
	}

	return AE_OK;
}

acpi_status
acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
{
	void __iomem *virt_addr;
	int iomem = 0;

	if (efi_enabled) {
		if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
			/* HACK ALERT! We can use writeb/w/l on real memory too */
			virt_addr = (void __iomem *)phys_to_virt(phys_addr);
		} else {
			iomem = 1;
			virt_addr = ioremap(phys_addr, width);
		}
	} else
		virt_addr = (void __iomem *)phys_to_virt(phys_addr);

	switch (width) {
	case 8:
		writeb(value, virt_addr);
		break;
	case 16:
		writew(value, virt_addr);
		break;
	case 32:
		writel(value, virt_addr);
		break;
	default:
		BUG();
	}

	if (iomem)
		iounmap(virt_addr);

	return AE_OK;
}

acpi_status
acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
			       void *value, u32 width)
{
	int result, size;

	if (!value)
		return AE_BAD_PARAMETER;

	switch (width) {
	case 8:
		size = 1;
		break;
	case 16:
		size = 2;
		break;
	case 32:
		size = 4;
		break;
	default:
		return AE_ERROR;
	}

	BUG_ON(!raw_pci_ops);

	result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
				   PCI_DEVFN(pci_id->device, pci_id->function),
				   reg, size, value);

	return (result ? AE_ERROR : AE_OK);
}

EXPORT_SYMBOL(acpi_os_read_pci_configuration);

acpi_status
acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
				acpi_integer value, u32 width)
{
	int result, size;

	switch (width) {
	case 8:
		size = 1;
		break;
	case 16:
		size = 2;
		break;
	case 32:
		size = 4;
		break;
	default:
		return AE_ERROR;
	}

	BUG_ON(!raw_pci_ops);

	result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
				    PCI_DEVFN(pci_id->device, pci_id->function),
				    reg, size, value);

	return (result ? AE_ERROR : AE_OK);
}

/* TODO: Change code to take advantage of driver model more */
static void acpi_os_derive_pci_id_2(acpi_handle rhandle,	/* upper bound  */
				    acpi_handle chandle,	/* current node */
				    struct acpi_pci_id **id,
				    int *is_bridge, u8 * bus_number)
{
	acpi_handle handle;
	struct acpi_pci_id *pci_id = *id;
	acpi_status status;
	unsigned long temp;
	acpi_object_type type;
	u8 tu8;

	acpi_get_parent(chandle, &handle);
	if (handle != rhandle) {
		acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
					bus_number);

		status = acpi_get_type(handle, &type);
		if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
			return;

		status =
		    acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
					  &temp);
		if (ACPI_SUCCESS(status)) {
			pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
			pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));

			if (*is_bridge)
				pci_id->bus = *bus_number;

			/* any nicer way to get bus number of bridge ? */
			status =
			    acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
							   8);
			if (ACPI_SUCCESS(status)
			    && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
				status =
				    acpi_os_read_pci_configuration(pci_id, 0x18,
								   &tu8, 8);
				if (!ACPI_SUCCESS(status)) {
					/* Certainly broken...  FIX ME */
					return;
				}
				*is_bridge = 1;
				pci_id->bus = tu8;
				status =
				    acpi_os_read_pci_configuration(pci_id, 0x19,
								   &tu8, 8);
				if (ACPI_SUCCESS(status)) {
					*bus_number = tu8;
				}
			} else
				*is_bridge = 0;
		}
	}
}

void acpi_os_derive_pci_id(acpi_handle rhandle,	/* upper bound  */
			   acpi_handle chandle,	/* current node */
			   struct acpi_pci_id **id)
{
	int is_bridge = 1;
	u8 bus_number = (*id)->bus;

	acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
}

static void acpi_os_execute_deferred(void *context)
{
	struct acpi_os_dpc *dpc = NULL;

	ACPI_FUNCTION_TRACE("os_execute_deferred");

	dpc = (struct acpi_os_dpc *)context;
	if (!dpc) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
		return_VOID;
	}

	dpc->function(dpc->context);

	kfree(dpc);

	return_VOID;
}

acpi_status
acpi_os_queue_for_execution(u32 priority,
			    acpi_osd_exec_callback function, void *context)
{
	acpi_status status = AE_OK;
	struct acpi_os_dpc *dpc;
	struct work_struct *task;

	ACPI_FUNCTION_TRACE("os_queue_for_execution");

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Scheduling function [%p(%p)] for deferred execution.\n",
			  function, context));

	if (!function)
		return_ACPI_STATUS(AE_BAD_PARAMETER);

	/*
	 * Allocate/initialize DPC structure.  Note that this memory will be
	 * freed by the callee.  The kernel handles the tq_struct list  in a
	 * way that allows us to also free its memory inside the callee.
	 * Because we may want to schedule several tasks with different
	 * parameters we can't use the approach some kernel code uses of
	 * having a static tq_struct.
	 * We can save time and code by allocating the DPC and tq_structs
	 * from the same memory.
	 */

	dpc =
	    kmalloc(sizeof(struct acpi_os_dpc) + sizeof(struct work_struct),
		    GFP_ATOMIC);
	if (!dpc)
		return_ACPI_STATUS(AE_NO_MEMORY);

	dpc->function = function;
	dpc->context = context;

	task = (void *)(dpc + 1);
	INIT_WORK(task, acpi_os_execute_deferred, (void *)dpc);

	if (!queue_work(kacpid_wq, task)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Call to queue_work() failed.\n"));
		kfree(dpc);
		status = AE_ERROR;
	}

	return_ACPI_STATUS(status);
}

EXPORT_SYMBOL(acpi_os_queue_for_execution);

void acpi_os_wait_events_complete(void *context)
{
	flush_workqueue(kacpid_wq);
}

EXPORT_SYMBOL(acpi_os_wait_events_complete);

/*
 * Allocate the memory for a spinlock and initialize it.
 */
acpi_status acpi_os_create_lock(acpi_handle * out_handle)
{
	spinlock_t *lock_ptr;

	ACPI_FUNCTION_TRACE("os_create_lock");

	lock_ptr = acpi_os_allocate(sizeof(spinlock_t));

	spin_lock_init(lock_ptr);

	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));

	*out_handle = lock_ptr;

	return_ACPI_STATUS(AE_OK);
}

/*
 * Deallocate the memory for a spinlock.
 */
void acpi_os_delete_lock(acpi_handle handle)
{
	ACPI_FUNCTION_TRACE("os_create_lock");

	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));

	acpi_os_free(handle);

	return_VOID;
}

acpi_status
acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
{
	struct semaphore *sem = NULL;

	ACPI_FUNCTION_TRACE("os_create_semaphore");

	sem = acpi_os_allocate(sizeof(struct semaphore));
	if (!sem)
		return_ACPI_STATUS(AE_NO_MEMORY);
	memset(sem, 0, sizeof(struct semaphore));

	sema_init(sem, initial_units);

	*handle = (acpi_handle *) sem;

	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
			  *handle, initial_units));

	return_ACPI_STATUS(AE_OK);
}

EXPORT_SYMBOL(acpi_os_create_semaphore);

/*
 * TODO: A better way to delete semaphores?  Linux doesn't have a
 * 'delete_semaphore()' function -- may result in an invalid
 * pointer dereference for non-synchronized consumers.	Should
 * we at least check for blocked threads and signal/cancel them?
 */

acpi_status acpi_os_delete_semaphore(acpi_handle handle)
{
	struct semaphore *sem = (struct semaphore *)handle;

	ACPI_FUNCTION_TRACE("os_delete_semaphore");

	if (!sem)
		return_ACPI_STATUS(AE_BAD_PARAMETER);

	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));

	acpi_os_free(sem);
	sem = NULL;

	return_ACPI_STATUS(AE_OK);
}

EXPORT_SYMBOL(acpi_os_delete_semaphore);

/*
 * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 * improvise.  The process is to sleep for one scheduler quantum
 * until the semaphore becomes available.  Downside is that this
 * may result in starvation for timeout-based waits when there's
 * lots of semaphore activity.
 *
 * TODO: Support for units > 1?
 */
acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
{
	acpi_status status = AE_OK;
	struct semaphore *sem = (struct semaphore *)handle;
	int ret = 0;

	ACPI_FUNCTION_TRACE("os_wait_semaphore");

	if (!sem || (units < 1))
		return_ACPI_STATUS(AE_BAD_PARAMETER);

	if (units > 1)
		return_ACPI_STATUS(AE_SUPPORT);

	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
			  handle, units, timeout));

	if (in_atomic())
		timeout = 0;

	switch (timeout) {
		/*
		 * No Wait:
		 * --------
		 * A zero timeout value indicates that we shouldn't wait - just
		 * acquire the semaphore if available otherwise return AE_TIME
		 * (a.k.a. 'would block').
		 */
	case 0:
		if (down_trylock(sem))
			status = AE_TIME;
		break;

		/*
		 * Wait Indefinitely:
		 * ------------------
		 */
	case ACPI_WAIT_FOREVER:
		down(sem);
		break;

		/*
		 * Wait w/ Timeout:
		 * ----------------
		 */
	default:
		// TODO: A better timeout algorithm?
		{
			int i = 0;
			static const int quantum_ms = 1000 / HZ;

			ret = down_trylock(sem);
			for (i = timeout; (i > 0 && ret < 0); i -= quantum_ms) {
				schedule_timeout_interruptible(1);
				ret = down_trylock(sem);
			}

			if (ret != 0)
				status = AE_TIME;
		}
		break;
	}

	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Failed to acquire semaphore[%p|%d|%d], %s\n",
				  handle, units, timeout,
				  acpi_format_exception(status)));
	} else {
		ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
				  "Acquired semaphore[%p|%d|%d]\n", handle,
				  units, timeout));
	}

	return_ACPI_STATUS(status);
}

EXPORT_SYMBOL(acpi_os_wait_semaphore);

/*
 * TODO: Support for units > 1?
 */
acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
{
	struct semaphore *sem = (struct semaphore *)handle;

	ACPI_FUNCTION_TRACE("os_signal_semaphore");

	if (!sem || (units < 1))
		return_ACPI_STATUS(AE_BAD_PARAMETER);

	if (units > 1)
		return_ACPI_STATUS(AE_SUPPORT);

	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
			  units));

	up(sem);

	return_ACPI_STATUS(AE_OK);
}

EXPORT_SYMBOL(acpi_os_signal_semaphore);

#ifdef ACPI_FUTURE_USAGE
u32 acpi_os_get_line(char *buffer)
{

#ifdef ENABLE_DEBUGGER
	if (acpi_in_debugger) {
		u32 chars;

		kdb_read(buffer, sizeof(line_buf));

		/* remove the CR kdb includes */
		chars = strlen(buffer) - 1;
		buffer[chars] = '\0';
	}
#endif

	return 0;
}
#endif				/*  ACPI_FUTURE_USAGE  */

/* Assumes no unreadable holes inbetween */
u8 acpi_os_readable(void *ptr, acpi_size len)
{
#if defined(__i386__) || defined(__x86_64__)
	char tmp;
	return !__get_user(tmp, (char __user *)ptr)
	    && !__get_user(tmp, (char __user *)ptr + len - 1);
#endif
	return 1;
}

#ifdef ACPI_FUTURE_USAGE
u8 acpi_os_writable(void *ptr, acpi_size len)
{
	/* could do dummy write (racy) or a kernel page table lookup.
	   The later may be difficult at early boot when kmap doesn't work yet. */
	return 1;
}
#endif

u32 acpi_os_get_thread_id(void)
{
	if (!in_atomic())
		return current->pid;

	return 0;
}

acpi_status acpi_os_signal(u32 function, void *info)
{
	switch (function) {
	case ACPI_SIGNAL_FATAL:
		printk(KERN_ERR PREFIX "Fatal opcode executed\n");
		break;
	case ACPI_SIGNAL_BREAKPOINT:
		/*
		 * AML Breakpoint
		 * ACPI spec. says to treat it as a NOP unless
		 * you are debugging.  So if/when we integrate
		 * AML debugger into the kernel debugger its
		 * hook will go here.  But until then it is
		 * not useful to print anything on breakpoints.
		 */
		break;
	default:
		break;
	}

	return AE_OK;
}

EXPORT_SYMBOL(acpi_os_signal);

static int __init acpi_os_name_setup(char *str)
{
	char *p = acpi_os_name;
	int count = ACPI_MAX_OVERRIDE_LEN - 1;

	if (!str || !*str)
		return 0;

	for (; count-- && str && *str; str++) {
		if (isalnum(*str) || *str == ' ' || *str == ':')
			*p++ = *str;
		else if (*str == '\'' || *str == '"')
			continue;
		else
			break;
	}
	*p = 0;

	return 1;

}

__setup("acpi_os_name=", acpi_os_name_setup);

/*
 * _OSI control
 * empty string disables _OSI
 * TBD additional string adds to _OSI
 */
static int __init acpi_osi_setup(char *str)
{
	if (str == NULL || *str == '\0') {
		printk(KERN_INFO PREFIX "_OSI method disabled\n");
		acpi_gbl_create_osi_method = FALSE;
	} else {
		/* TBD */
		printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
		       str);
	}

	return 1;
}

__setup("acpi_osi=", acpi_osi_setup);

/* enable serialization to combat AE_ALREADY_EXISTS errors */
static int __init acpi_serialize_setup(char *str)
{
	printk(KERN_INFO PREFIX "serialize enabled\n");

	acpi_gbl_all_methods_serialized = TRUE;

	return 1;
}

__setup("acpi_serialize", acpi_serialize_setup);

/*
 * Wake and Run-Time GPES are expected to be separate.
 * We disable wake-GPEs at run-time to prevent spurious
 * interrupts.
 *
 * However, if a system exists that shares Wake and
 * Run-time events on the same GPE this flag is available
 * to tell Linux to keep the wake-time GPEs enabled at run-time.
 */
static int __init acpi_wake_gpes_always_on_setup(char *str)
{
	printk(KERN_INFO PREFIX "wake GPEs not disabled\n");

	acpi_gbl_leave_wake_gpes_disabled = FALSE;

	return 1;
}

__setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);

static int __init acpi_hotkey_setup(char *str)
{
	acpi_specific_hotkey_enabled = FALSE;
	return 1;
}

__setup("acpi_generic_hotkey", acpi_hotkey_setup);

/*
 * max_cstate is defined in the base kernel so modules can
 * change it w/o depending on the state of the processor module.
 */
unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;

EXPORT_SYMBOL(max_cstate);

/*
 * Acquire a spinlock.
 *
 * handle is a pointer to the spinlock_t.
 * flags is *not* the result of save_flags - it is an ACPI-specific flag variable
 *   that indicates whether we are at interrupt level.
 */

unsigned long acpi_os_acquire_lock(acpi_handle handle)
{
	unsigned long flags;
	spin_lock_irqsave((spinlock_t *) handle, flags);
	return flags;
}

/*
 * Release a spinlock. See above.
 */

void acpi_os_release_lock(acpi_handle handle, unsigned long flags)
{
	spin_unlock_irqrestore((spinlock_t *) handle, flags);
}

#ifndef ACPI_USE_LOCAL_CACHE

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_create_cache
 *
 * PARAMETERS:  CacheName       - Ascii name for the cache
 *              ObjectSize      - Size of each cached object
 *              MaxDepth        - Maximum depth of the cache (in objects)
 *              ReturnCache     - Where the new cache object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a cache object
 *
 ******************************************************************************/

acpi_status
acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
{
	*cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
	return AE_OK;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_purge_cache
 *
 * PARAMETERS:  Cache           - Handle to cache object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Free all objects within the requested cache.
 *
 ******************************************************************************/

acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
{
	(void)kmem_cache_shrink(cache);
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_delete_cache
 *
 * PARAMETERS:  Cache           - Handle to cache object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Free all objects within the requested cache and delete the
 *              cache object.
 *
 ******************************************************************************/

acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
{
	(void)kmem_cache_destroy(cache);
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_release_object
 *
 * PARAMETERS:  Cache       - Handle to cache object
 *              Object      - The object to be released
 *
 * RETURN:      None
 *
 * DESCRIPTION: Release an object to the specified cache.  If cache is full,
 *              the object is deleted.
 *
 ******************************************************************************/

acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
{
	kmem_cache_free(cache, object);
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_acquire_object
 *
 * PARAMETERS:  Cache           - Handle to cache object
 *              ReturnObject    - Where the object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get an object from the specified cache.  If cache is empty,
 *              the object is allocated.
 *
 ******************************************************************************/

void *acpi_os_acquire_object(acpi_cache_t * cache)
{
	void *object = kmem_cache_alloc(cache, GFP_KERNEL);
	WARN_ON(!object);
	return object;
}

#endif