Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 9c0edf2fc0dd57df77d526e25d3f69dd3b2cd81b (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
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  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>
 *  Copyright (c) 2008 Intel Corporation
 *   Author: Matthew Wilcox <willy@linux.intel.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/kmod.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/nmi.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/jiffies.h>
#include <linux/semaphore.h>

#include <asm/io.h>
#include <linux/uaccess.h>
#include <linux/io-64-nonatomic-lo-hi.h>

#include "acpica/accommon.h"
#include "acpica/acnamesp.h"
#include "internal.h"

#define _COMPONENT		ACPI_OS_SERVICES
ACPI_MODULE_NAME("osl");

struct acpi_os_dpc {
	acpi_osd_exec_callback function;
	void *context;
	struct work_struct work;
};

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

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

static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
				      u32 pm1b_ctrl);
static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
				      u32 val_b);

static acpi_osd_handler acpi_irq_handler;
static void *acpi_irq_context;
static struct workqueue_struct *kacpid_wq;
static struct workqueue_struct *kacpi_notify_wq;
static struct workqueue_struct *kacpi_hotplug_wq;
static bool acpi_os_initialized;
unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
bool acpi_permanent_mmap = false;

/*
 * This list of permanent mappings is for memory that may be accessed from
 * interrupt context, where we can't do the ioremap().
 */
struct acpi_ioremap {
	struct list_head list;
	void __iomem *virt;
	acpi_physical_address phys;
	acpi_size size;
	unsigned long refcount;
};

static LIST_HEAD(acpi_ioremaps);
static DEFINE_MUTEX(acpi_ioremap_lock);

static void __init acpi_request_region (struct acpi_generic_address *gas,
	unsigned int length, char *desc)
{
	u64 addr;

	/* Handle possible alignment issues */
	memcpy(&addr, &gas->address, sizeof(addr));
	if (!addr || !length)
		return;

	/* Resources are never freed */
	if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
		request_region(addr, length, desc);
	else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
		request_mem_region(addr, length, desc);
}

static int __init acpi_reserve_resources(void)
{
	acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
		"ACPI PM1a_EVT_BLK");

	acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
		"ACPI PM1b_EVT_BLK");

	acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
		"ACPI PM1a_CNT_BLK");

	acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
		"ACPI PM1b_CNT_BLK");

	if (acpi_gbl_FADT.pm_timer_length == 4)
		acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");

	acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
		"ACPI PM2_CNT_BLK");

	/* Length of GPE blocks must be a non-negative multiple of 2 */

	if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
		acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
			       acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");

	if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
		acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
			       acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");

	return 0;
}
fs_initcall_sync(acpi_reserve_resources);

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 {
		if (printk_get_level(buffer))
			printk("%s", buffer);
		else
			printk(KERN_CONT "%s", buffer);
	}
#else
	if (acpi_debugger_write_log(buffer) < 0) {
		if (printk_get_level(buffer))
			printk("%s", buffer);
		else
			printk(KERN_CONT "%s", buffer);
	}
#endif
}

#ifdef CONFIG_KEXEC
static unsigned long acpi_rsdp;
static int __init setup_acpi_rsdp(char *arg)
{
	return kstrtoul(arg, 16, &acpi_rsdp);
}
early_param("acpi_rsdp", setup_acpi_rsdp);
#endif

acpi_physical_address __init acpi_os_get_root_pointer(void)
{
	acpi_physical_address pa;

#ifdef CONFIG_KEXEC
	if (acpi_rsdp)
		return acpi_rsdp;
#endif
	pa = acpi_arch_get_root_pointer();
	if (pa)
		return pa;

	if (efi_enabled(EFI_CONFIG_TABLES)) {
		if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
			return efi.acpi20;
		if (efi.acpi != EFI_INVALID_TABLE_ADDR)
			return efi.acpi;
		pr_err(PREFIX "System description tables not found\n");
	} else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
		acpi_find_root_pointer(&pa);
	}

	return pa;
}

/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
static struct acpi_ioremap *
acpi_map_lookup(acpi_physical_address phys, acpi_size size)
{
	struct acpi_ioremap *map;

	list_for_each_entry_rcu(map, &acpi_ioremaps, list)
		if (map->phys <= phys &&
		    phys + size <= map->phys + map->size)
			return map;

	return NULL;
}

/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
static void __iomem *
acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
{
	struct acpi_ioremap *map;

	map = acpi_map_lookup(phys, size);
	if (map)
		return map->virt + (phys - map->phys);

	return NULL;
}

void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
{
	struct acpi_ioremap *map;
	void __iomem *virt = NULL;

	mutex_lock(&acpi_ioremap_lock);
	map = acpi_map_lookup(phys, size);
	if (map) {
		virt = map->virt + (phys - map->phys);
		map->refcount++;
	}
	mutex_unlock(&acpi_ioremap_lock);
	return virt;
}
EXPORT_SYMBOL_GPL(acpi_os_get_iomem);

/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
static struct acpi_ioremap *
acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
{
	struct acpi_ioremap *map;

	list_for_each_entry_rcu(map, &acpi_ioremaps, list)
		if (map->virt <= virt &&
		    virt + size <= map->virt + map->size)
			return map;

	return NULL;
}

#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
/* ioremap will take care of cache attributes */
#define should_use_kmap(pfn)   0
#else
#define should_use_kmap(pfn)   page_is_ram(pfn)
#endif

static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
{
	unsigned long pfn;

	pfn = pg_off >> PAGE_SHIFT;
	if (should_use_kmap(pfn)) {
		if (pg_sz > PAGE_SIZE)
			return NULL;
		return (void __iomem __force *)kmap(pfn_to_page(pfn));
	} else
		return acpi_os_ioremap(pg_off, pg_sz);
}

static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
{
	unsigned long pfn;

	pfn = pg_off >> PAGE_SHIFT;
	if (should_use_kmap(pfn))
		kunmap(pfn_to_page(pfn));
	else
		iounmap(vaddr);
}

/**
 * acpi_os_map_iomem - Get a virtual address for a given physical address range.
 * @phys: Start of the physical address range to map.
 * @size: Size of the physical address range to map.
 *
 * Look up the given physical address range in the list of existing ACPI memory
 * mappings.  If found, get a reference to it and return a pointer to it (its
 * virtual address).  If not found, map it, add it to that list and return a
 * pointer to it.
 *
 * During early init (when acpi_permanent_mmap has not been set yet) this
 * routine simply calls __acpi_map_table() to get the job done.
 */
void __iomem __ref
*acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
{
	struct acpi_ioremap *map;
	void __iomem *virt;
	acpi_physical_address pg_off;
	acpi_size pg_sz;

	if (phys > ULONG_MAX) {
		printk(KERN_ERR PREFIX "Cannot map memory that high\n");
		return NULL;
	}

	if (!acpi_permanent_mmap)
		return __acpi_map_table((unsigned long)phys, size);

	mutex_lock(&acpi_ioremap_lock);
	/* Check if there's a suitable mapping already. */
	map = acpi_map_lookup(phys, size);
	if (map) {
		map->refcount++;
		goto out;
	}

	map = kzalloc(sizeof(*map), GFP_KERNEL);
	if (!map) {
		mutex_unlock(&acpi_ioremap_lock);
		return NULL;
	}

	pg_off = round_down(phys, PAGE_SIZE);
	pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
	virt = acpi_map(pg_off, pg_sz);
	if (!virt) {
		mutex_unlock(&acpi_ioremap_lock);
		kfree(map);
		return NULL;
	}

	INIT_LIST_HEAD(&map->list);
	map->virt = virt;
	map->phys = pg_off;
	map->size = pg_sz;
	map->refcount = 1;

	list_add_tail_rcu(&map->list, &acpi_ioremaps);

out:
	mutex_unlock(&acpi_ioremap_lock);
	return map->virt + (phys - map->phys);
}
EXPORT_SYMBOL_GPL(acpi_os_map_iomem);

void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
{
	return (void *)acpi_os_map_iomem(phys, size);
}
EXPORT_SYMBOL_GPL(acpi_os_map_memory);

static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
{
	if (!--map->refcount)
		list_del_rcu(&map->list);
}

static void acpi_os_map_cleanup(struct acpi_ioremap *map)
{
	if (!map->refcount) {
		synchronize_rcu_expedited();
		acpi_unmap(map->phys, map->virt);
		kfree(map);
	}
}

/**
 * acpi_os_unmap_iomem - Drop a memory mapping reference.
 * @virt: Start of the address range to drop a reference to.
 * @size: Size of the address range to drop a reference to.
 *
 * Look up the given virtual address range in the list of existing ACPI memory
 * mappings, drop a reference to it and unmap it if there are no more active
 * references to it.
 *
 * During early init (when acpi_permanent_mmap has not been set yet) this
 * routine simply calls __acpi_unmap_table() to get the job done.  Since
 * __acpi_unmap_table() is an __init function, the __ref annotation is needed
 * here.
 */
void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
{
	struct acpi_ioremap *map;

	if (!acpi_permanent_mmap) {
		__acpi_unmap_table(virt, size);
		return;
	}

	mutex_lock(&acpi_ioremap_lock);
	map = acpi_map_lookup_virt(virt, size);
	if (!map) {
		mutex_unlock(&acpi_ioremap_lock);
		WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
		return;
	}
	acpi_os_drop_map_ref(map);
	mutex_unlock(&acpi_ioremap_lock);

	acpi_os_map_cleanup(map);
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);

void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
{
	return acpi_os_unmap_iomem((void __iomem *)virt, size);
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);

int acpi_os_map_generic_address(struct acpi_generic_address *gas)
{
	u64 addr;
	void __iomem *virt;

	if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
		return 0;

	/* Handle possible alignment issues */
	memcpy(&addr, &gas->address, sizeof(addr));
	if (!addr || !gas->bit_width)
		return -EINVAL;

	virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
	if (!virt)
		return -EIO;

	return 0;
}
EXPORT_SYMBOL(acpi_os_map_generic_address);

void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
{
	u64 addr;
	struct acpi_ioremap *map;

	if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
		return;

	/* Handle possible alignment issues */
	memcpy(&addr, &gas->address, sizeof(addr));
	if (!addr || !gas->bit_width)
		return;

	mutex_lock(&acpi_ioremap_lock);
	map = acpi_map_lookup(addr, gas->bit_width / 8);
	if (!map) {
		mutex_unlock(&acpi_ioremap_lock);
		return;
	}
	acpi_os_drop_map_ref(map);
	mutex_unlock(&acpi_ioremap_lock);

	acpi_os_map_cleanup(map);
}
EXPORT_SYMBOL(acpi_os_unmap_generic_address);

#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

#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
static bool acpi_rev_override;

int __init acpi_rev_override_setup(char *str)
{
	acpi_rev_override = true;
	return 1;
}
__setup("acpi_rev_override", acpi_rev_override_setup);
#else
#define acpi_rev_override	false
#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;
	}

	if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
		printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
		*new_val = (char *)5;
	}

	return AE_OK;
}

static irqreturn_t acpi_irq(int irq, void *dev_id)
{
	u32 handled;

	handled = (*acpi_irq_handler) (acpi_irq_context);

	if (handled) {
		acpi_irq_handled++;
		return IRQ_HANDLED;
	} else {
		acpi_irq_not_handled++;
		return IRQ_NONE;
	}
}

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

	acpi_irq_stats_init();

	/*
	 * ACPI interrupts different from the SCI in our copy of the FADT are
	 * not supported.
	 */
	if (gsi != acpi_gbl_FADT.sci_interrupt)
		return AE_BAD_PARAMETER;

	if (acpi_irq_handler)
		return AE_ALREADY_ACQUIRED;

	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, IRQF_SHARED, "acpi", acpi_irq)) {
		printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
		acpi_irq_handler = NULL;
		return AE_NOT_ACQUIRED;
	}
	acpi_sci_irq = irq;

	return AE_OK;
}

acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
{
	if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
		return AE_BAD_PARAMETER;

	free_irq(acpi_sci_irq, acpi_irq);
	acpi_irq_handler = NULL;
	acpi_sci_irq = INVALID_ACPI_IRQ;

	return AE_OK;
}

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

void acpi_os_sleep(u64 ms)
{
	msleep(ms);
}

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

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

/*
 * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
 * monotonically increasing timer with 100ns granularity. Do not use
 * ktime_get() to implement this function because this function may get
 * called after timekeeping has been suspended. Note: calling this function
 * after timekeeping has been suspended may lead to unexpected results
 * because when timekeeping is suspended the jiffies counter is not
 * incremented. See also timekeeping_suspend().
 */
u64 acpi_os_get_timer(void)
{
	return (get_jiffies_64() - INITIAL_JIFFIES) *
		(ACPI_100NSEC_PER_SEC / HZ);
}

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

	if (!value)
		value = &dummy;

	*value = 0;
	if (width <= 8) {
		*(u8 *) value = inb(port);
	} else if (width <= 16) {
		*(u16 *) value = inw(port);
	} else if (width <= 32) {
		*(u32 *) value = inl(port);
	} else {
		BUG();
	}

	return AE_OK;
}

EXPORT_SYMBOL(acpi_os_read_port);

acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
{
	if (width <= 8) {
		outb(value, port);
	} else if (width <= 16) {
		outw(value, port);
	} else if (width <= 32) {
		outl(value, port);
	} else {
		BUG();
	}

	return AE_OK;
}

EXPORT_SYMBOL(acpi_os_write_port);

int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
{

	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;
	case 64:
		*(u64 *) value = readq(virt_addr);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

acpi_status
acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
{
	void __iomem *virt_addr;
	unsigned int size = width / 8;
	bool unmap = false;
	u64 dummy;
	int error;

	rcu_read_lock();
	virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
	if (!virt_addr) {
		rcu_read_unlock();
		virt_addr = acpi_os_ioremap(phys_addr, size);
		if (!virt_addr)
			return AE_BAD_ADDRESS;
		unmap = true;
	}

	if (!value)
		value = &dummy;

	error = acpi_os_read_iomem(virt_addr, value, width);
	BUG_ON(error);

	if (unmap)
		iounmap(virt_addr);
	else
		rcu_read_unlock();

	return AE_OK;
}

acpi_status
acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
{
	void __iomem *virt_addr;
	unsigned int size = width / 8;
	bool unmap = false;

	rcu_read_lock();
	virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
	if (!virt_addr) {
		rcu_read_unlock();
		virt_addr = acpi_os_ioremap(phys_addr, size);
		if (!virt_addr)
			return AE_BAD_ADDRESS;
		unmap = true;
	}

	switch (width) {
	case 8:
		writeb(value, virt_addr);
		break;
	case 16:
		writew(value, virt_addr);
		break;
	case 32:
		writel(value, virt_addr);
		break;
	case 64:
		writeq(value, virt_addr);
		break;
	default:
		BUG();
	}

	if (unmap)
		iounmap(virt_addr);
	else
		rcu_read_unlock();

	return AE_OK;
}

#ifdef CONFIG_PCI
acpi_status
acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
			       u64 *value, u32 width)
{
	int result, size;
	u32 value32;

	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;
	}

	result = raw_pci_read(pci_id->segment, pci_id->bus,
				PCI_DEVFN(pci_id->device, pci_id->function),
				reg, size, &value32);
	*value = value32;

	return (result ? AE_ERROR : AE_OK);
}

acpi_status
acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
				u64 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;
	}

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

	return (result ? AE_ERROR : AE_OK);
}
#endif

static void acpi_os_execute_deferred(struct work_struct *work)
{
	struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);

	dpc->function(dpc->context);
	kfree(dpc);
}

#ifdef CONFIG_ACPI_DEBUGGER
static struct acpi_debugger acpi_debugger;
static bool acpi_debugger_initialized;

int acpi_register_debugger(struct module *owner,
			   const struct acpi_debugger_ops *ops)
{
	int ret = 0;

	mutex_lock(&acpi_debugger.lock);
	if (acpi_debugger.ops) {
		ret = -EBUSY;
		goto err_lock;
	}

	acpi_debugger.owner = owner;
	acpi_debugger.ops = ops;

err_lock:
	mutex_unlock(&acpi_debugger.lock);
	return ret;
}
EXPORT_SYMBOL(acpi_register_debugger);

void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
{
	mutex_lock(&acpi_debugger.lock);
	if (ops == acpi_debugger.ops) {
		acpi_debugger.ops = NULL;
		acpi_debugger.owner = NULL;
	}
	mutex_unlock(&acpi_debugger.lock);
}
EXPORT_SYMBOL(acpi_unregister_debugger);

int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
{
	int ret;
	int (*func)(acpi_osd_exec_callback, void *);
	struct module *owner;

	if (!acpi_debugger_initialized)
		return -ENODEV;
	mutex_lock(&acpi_debugger.lock);
	if (!acpi_debugger.ops) {
		ret = -ENODEV;
		goto err_lock;
	}
	if (!try_module_get(acpi_debugger.owner)) {
		ret = -ENODEV;
		goto err_lock;
	}
	func = acpi_debugger.ops->create_thread;
	owner = acpi_debugger.owner;
	mutex_unlock(&acpi_debugger.lock);

	ret = func(function, context);

	mutex_lock(&acpi_debugger.lock);
	module_put(owner);
err_lock:
	mutex_unlock(&acpi_debugger.lock);
	return ret;
}

ssize_t acpi_debugger_write_log(const char *msg)
{
	ssize_t ret;
	ssize_t (*func)(const char *);
	struct module *owner;

	if (!acpi_debugger_initialized)
		return -ENODEV;
	mutex_lock(&acpi_debugger.lock);
	if (!acpi_debugger.ops) {
		ret = -ENODEV;
		goto err_lock;
	}
	if (!try_module_get(acpi_debugger.owner)) {
		ret = -ENODEV;
		goto err_lock;
	}
	func = acpi_debugger.ops->write_log;
	owner = acpi_debugger.owner;
	mutex_unlock(&acpi_debugger.lock);

	ret = func(msg);

	mutex_lock(&acpi_debugger.lock);
	module_put(owner);
err_lock:
	mutex_unlock(&acpi_debugger.lock);
	return ret;
}

ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
{
	ssize_t ret;
	ssize_t (*func)(char *, size_t);
	struct module *owner;

	if (!acpi_debugger_initialized)
		return -ENODEV;
	mutex_lock(&acpi_debugger.lock);
	if (!acpi_debugger.ops) {
		ret = -ENODEV;
		goto err_lock;
	}
	if (!try_module_get(acpi_debugger.owner)) {
		ret = -ENODEV;
		goto err_lock;
	}
	func = acpi_debugger.ops->read_cmd;
	owner = acpi_debugger.owner;
	mutex_unlock(&acpi_debugger.lock);

	ret = func(buffer, buffer_length);

	mutex_lock(&acpi_debugger.lock);
	module_put(owner);
err_lock:
	mutex_unlock(&acpi_debugger.lock);
	return ret;
}

int acpi_debugger_wait_command_ready(void)
{
	int ret;
	int (*func)(bool, char *, size_t);
	struct module *owner;

	if (!acpi_debugger_initialized)
		return -ENODEV;
	mutex_lock(&acpi_debugger.lock);
	if (!acpi_debugger.ops) {
		ret = -ENODEV;
		goto err_lock;
	}
	if (!try_module_get(acpi_debugger.owner)) {
		ret = -ENODEV;
		goto err_lock;
	}
	func = acpi_debugger.ops->wait_command_ready;
	owner = acpi_debugger.owner;
	mutex_unlock(&acpi_debugger.lock);

	ret = func(acpi_gbl_method_executing,
		   acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);

	mutex_lock(&acpi_debugger.lock);
	module_put(owner);
err_lock:
	mutex_unlock(&acpi_debugger.lock);
	return ret;
}

int acpi_debugger_notify_command_complete(void)
{
	int ret;
	int (*func)(void);
	struct module *owner;

	if (!acpi_debugger_initialized)
		return -ENODEV;
	mutex_lock(&acpi_debugger.lock);
	if (!acpi_debugger.ops) {
		ret = -ENODEV;
		goto err_lock;
	}
	if (!try_module_get(acpi_debugger.owner)) {
		ret = -ENODEV;
		goto err_lock;
	}
	func = acpi_debugger.ops->notify_command_complete;
	owner = acpi_debugger.owner;
	mutex_unlock(&acpi_debugger.lock);

	ret = func();

	mutex_lock(&acpi_debugger.lock);
	module_put(owner);
err_lock:
	mutex_unlock(&acpi_debugger.lock);
	return ret;
}

int __init acpi_debugger_init(void)
{
	mutex_init(&acpi_debugger.lock);
	acpi_debugger_initialized = true;
	return 0;
}
#endif

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_execute
 *
 * PARAMETERS:  Type               - Type of the callback
 *              Function           - Function to be executed
 *              Context            - Function parameters
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Depending on type, either queues function for deferred execution or
 *              immediately executes function on a separate thread.
 *
 ******************************************************************************/

acpi_status acpi_os_execute(acpi_execute_type type,
			    acpi_osd_exec_callback function, void *context)
{
	acpi_status status = AE_OK;
	struct acpi_os_dpc *dpc;
	struct workqueue_struct *queue;
	int ret;
	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Scheduling function [%p(%p)] for deferred execution.\n",
			  function, context));

	if (type == OSL_DEBUGGER_MAIN_THREAD) {
		ret = acpi_debugger_create_thread(function, context);
		if (ret) {
			pr_err("Call to kthread_create() failed.\n");
			status = AE_ERROR;
		}
		goto out_thread;
	}

	/*
	 * Allocate/initialize DPC structure.  Note that this memory will be
	 * freed by the callee.  The kernel handles the work_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 work_struct.
	 */

	dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
	if (!dpc)
		return AE_NO_MEMORY;

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

	/*
	 * To prevent lockdep from complaining unnecessarily, make sure that
	 * there is a different static lockdep key for each workqueue by using
	 * INIT_WORK() for each of them separately.
	 */
	if (type == OSL_NOTIFY_HANDLER) {
		queue = kacpi_notify_wq;
		INIT_WORK(&dpc->work, acpi_os_execute_deferred);
	} else if (type == OSL_GPE_HANDLER) {
		queue = kacpid_wq;
		INIT_WORK(&dpc->work, acpi_os_execute_deferred);
	} else {
		pr_err("Unsupported os_execute type %d.\n", type);
		status = AE_ERROR;
	}

	if (ACPI_FAILURE(status))
		goto err_workqueue;

	/*
	 * On some machines, a software-initiated SMI causes corruption unless
	 * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
	 * typically it's done in GPE-related methods that are run via
	 * workqueues, so we can avoid the known corruption cases by always
	 * queueing on CPU 0.
	 */
	ret = queue_work_on(0, queue, &dpc->work);
	if (!ret) {
		printk(KERN_ERR PREFIX
			  "Call to queue_work() failed.\n");
		status = AE_ERROR;
	}
err_workqueue:
	if (ACPI_FAILURE(status))
		kfree(dpc);
out_thread:
	return status;
}
EXPORT_SYMBOL(acpi_os_execute);

void acpi_os_wait_events_complete(void)
{
	/*
	 * Make sure the GPE handler or the fixed event handler is not used
	 * on another CPU after removal.
	 */
	if (acpi_sci_irq_valid())
		synchronize_hardirq(acpi_sci_irq);
	flush_workqueue(kacpid_wq);
	flush_workqueue(kacpi_notify_wq);
}
EXPORT_SYMBOL(acpi_os_wait_events_complete);

struct acpi_hp_work {
	struct work_struct work;
	struct acpi_device *adev;
	u32 src;
};

static void acpi_hotplug_work_fn(struct work_struct *work)
{
	struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);

	acpi_os_wait_events_complete();
	acpi_device_hotplug(hpw->adev, hpw->src);
	kfree(hpw);
}

acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
{
	struct acpi_hp_work *hpw;

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
		  "Scheduling hotplug event (%p, %u) for deferred execution.\n",
		  adev, src));

	hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
	if (!hpw)
		return AE_NO_MEMORY;

	INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
	hpw->adev = adev;
	hpw->src = src;
	/*
	 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
	 * the hotplug code may call driver .remove() functions, which may
	 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
	 * these workqueues.
	 */
	if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
		kfree(hpw);
		return AE_ERROR;
	}
	return AE_OK;
}

bool acpi_queue_hotplug_work(struct work_struct *work)
{
	return queue_work(kacpi_hotplug_wq, work);
}

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

	sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
	if (!sem)
		return AE_NO_MEMORY;

	sema_init(sem, initial_units);

	*handle = (acpi_handle *) sem;

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

	return AE_OK;
}

/*
 * 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;

	if (!sem)
		return AE_BAD_PARAMETER;

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

	BUG_ON(!list_empty(&sem->wait_list));
	kfree(sem);
	sem = NULL;

	return AE_OK;
}

/*
 * 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;
	long jiffies;
	int ret = 0;

	if (!acpi_os_initialized)
		return AE_OK;

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

	if (units > 1)
		return AE_SUPPORT;

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

	if (timeout == ACPI_WAIT_FOREVER)
		jiffies = MAX_SCHEDULE_TIMEOUT;
	else
		jiffies = msecs_to_jiffies(timeout);

	ret = down_timeout(sem, jiffies);
	if (ret)
		status = AE_TIME;

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

	return status;
}

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

	if (!acpi_os_initialized)
		return AE_OK;

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

	if (units > 1)
		return AE_SUPPORT;

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

	up(sem);

	return AE_OK;
}

acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
{
#ifdef ENABLE_DEBUGGER
	if (acpi_in_debugger) {
		u32 chars;

		kdb_read(buffer, buffer_length);

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

	ret = acpi_debugger_read_cmd(buffer, buffer_length);
	if (ret < 0)
		return AE_ERROR;
	if (bytes_read)
		*bytes_read = ret;
#endif

	return AE_OK;
}
EXPORT_SYMBOL(acpi_os_get_line);

acpi_status acpi_os_wait_command_ready(void)
{
	int ret;

	ret = acpi_debugger_wait_command_ready();
	if (ret < 0)
		return AE_ERROR;
	return AE_OK;
}

acpi_status acpi_os_notify_command_complete(void)
{
	int ret;

	ret = acpi_debugger_notify_command_complete();
	if (ret < 0)
		return AE_ERROR;
	return AE_OK;
}

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;
}

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++) {
		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);

/*
 * Disable the auto-serialization of named objects creation methods.
 *
 * This feature is enabled by default.  It marks the AML control methods
 * that contain the opcodes to create named objects as "Serialized".
 */
static int __init acpi_no_auto_serialize_setup(char *str)
{
	acpi_gbl_auto_serialize_methods = FALSE;
	pr_info("ACPI: auto-serialization disabled\n");

	return 1;
}

__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);

/* Check of resource interference between native drivers and ACPI
 * OperationRegions (SystemIO and System Memory only).
 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
 * in arbitrary AML code and can interfere with legacy drivers.
 * acpi_enforce_resources= can be set to:
 *
 *   - strict (default) (2)
 *     -> further driver trying to access the resources will not load
 *   - lax              (1)
 *     -> further driver trying to access the resources will load, but you
 *     get a system message that something might go wrong...
 *
 *   - no               (0)
 *     -> ACPI Operation Region resources will not be registered
 *
 */
#define ENFORCE_RESOURCES_STRICT 2
#define ENFORCE_RESOURCES_LAX    1
#define ENFORCE_RESOURCES_NO     0

static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;

static int __init acpi_enforce_resources_setup(char *str)
{
	if (str == NULL || *str == '\0')
		return 0;

	if (!strcmp("strict", str))
		acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
	else if (!strcmp("lax", str))
		acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
	else if (!strcmp("no", str))
		acpi_enforce_resources = ENFORCE_RESOURCES_NO;

	return 1;
}

__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);

/* Check for resource conflicts between ACPI OperationRegions and native
 * drivers */
int acpi_check_resource_conflict(const struct resource *res)
{
	acpi_adr_space_type space_id;
	acpi_size length;
	u8 warn = 0;
	int clash = 0;

	if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
		return 0;
	if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
		return 0;

	if (res->flags & IORESOURCE_IO)
		space_id = ACPI_ADR_SPACE_SYSTEM_IO;
	else
		space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;

	length = resource_size(res);
	if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
		warn = 1;
	clash = acpi_check_address_range(space_id, res->start, length, warn);

	if (clash) {
		if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
			if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
				printk(KERN_NOTICE "ACPI: This conflict may"
				       " cause random problems and system"
				       " instability\n");
			printk(KERN_INFO "ACPI: If an ACPI driver is available"
			       " for this device, you should use it instead of"
			       " the native driver\n");
		}
		if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
			return -EBUSY;
	}
	return 0;
}
EXPORT_SYMBOL(acpi_check_resource_conflict);

int acpi_check_region(resource_size_t start, resource_size_t n,
		      const char *name)
{
	struct resource res = {
		.start = start,
		.end   = start + n - 1,
		.name  = name,
		.flags = IORESOURCE_IO,
	};

	return acpi_check_resource_conflict(&res);
}
EXPORT_SYMBOL(acpi_check_region);

static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
					      void *_res, void **return_value)
{
	struct acpi_mem_space_context **mem_ctx;
	union acpi_operand_object *handler_obj;
	union acpi_operand_object *region_obj2;
	union acpi_operand_object *region_obj;
	struct resource *res = _res;
	acpi_status status;

	region_obj = acpi_ns_get_attached_object(handle);
	if (!region_obj)
		return AE_OK;

	handler_obj = region_obj->region.handler;
	if (!handler_obj)
		return AE_OK;

	if (region_obj->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
		return AE_OK;

	if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE))
		return AE_OK;

	region_obj2 = acpi_ns_get_secondary_object(region_obj);
	if (!region_obj2)
		return AE_OK;

	mem_ctx = (void *)&region_obj2->extra.region_context;

	if (!(mem_ctx[0]->address >= res->start &&
	      mem_ctx[0]->address < res->end))
		return AE_OK;

	status = handler_obj->address_space.setup(region_obj,
						  ACPI_REGION_DEACTIVATE,
						  NULL, (void **)mem_ctx);
	if (ACPI_SUCCESS(status))
		region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);

	return status;
}

/**
 * acpi_release_memory - Release any mappings done to a memory region
 * @handle: Handle to namespace node
 * @res: Memory resource
 * @level: A level that terminates the search
 *
 * Walks through @handle and unmaps all SystemMemory Operation Regions that
 * overlap with @res and that have already been activated (mapped).
 *
 * This is a helper that allows drivers to place special requirements on memory
 * region that may overlap with operation regions, primarily allowing them to
 * safely map the region as non-cached memory.
 *
 * The unmapped Operation Regions will be automatically remapped next time they
 * are called, so the drivers do not need to do anything else.
 */
acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
				u32 level)
{
	if (!(res->flags & IORESOURCE_MEM))
		return AE_TYPE;

	return acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
				   acpi_deactivate_mem_region, NULL, res, NULL);
}
EXPORT_SYMBOL_GPL(acpi_release_memory);

/*
 * Let drivers know whether the resource checks are effective
 */
int acpi_resources_are_enforced(void)
{
	return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
}
EXPORT_SYMBOL(acpi_resources_are_enforced);

/*
 * Deallocate the memory for a spinlock.
 */
void acpi_os_delete_lock(acpi_spinlock handle)
{
	ACPI_FREE(handle);
}

/*
 * Acquire a spinlock.
 *
 * handle is a pointer to the spinlock_t.
 */

acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
{
	acpi_cpu_flags flags;
	spin_lock_irqsave(lockp, flags);
	return flags;
}

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

void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
{
	spin_unlock_irqrestore(lockp, flags);
}

#ifndef ACPI_USE_LOCAL_CACHE

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_create_cache
 *
 * PARAMETERS:  name      - Ascii name for the cache
 *              size      - Size of each cached object
 *              depth     - Maximum depth of the cache (in objects) <ignored>
 *              cache     - 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);
	if (*cache == NULL)
		return AE_ERROR;
	else
		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)
{
	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)
{
	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);
}
#endif

static int __init acpi_no_static_ssdt_setup(char *s)
{
	acpi_gbl_disable_ssdt_table_install = TRUE;
	pr_info("ACPI: static SSDT installation disabled\n");

	return 0;
}

early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);

static int __init acpi_disable_return_repair(char *s)
{
	printk(KERN_NOTICE PREFIX
	       "ACPI: Predefined validation mechanism disabled\n");
	acpi_gbl_disable_auto_repair = TRUE;

	return 1;
}

__setup("acpica_no_return_repair", acpi_disable_return_repair);

acpi_status __init acpi_os_initialize(void)
{
	acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
	acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
	acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
	acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
	if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
		/*
		 * Use acpi_os_map_generic_address to pre-map the reset
		 * register if it's in system memory.
		 */
		int rv;

		rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
		pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
	}
	acpi_os_initialized = true;

	return AE_OK;
}

acpi_status __init acpi_os_initialize1(void)
{
	kacpid_wq = alloc_workqueue("kacpid", 0, 1);
	kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
	kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
	BUG_ON(!kacpid_wq);
	BUG_ON(!kacpi_notify_wq);
	BUG_ON(!kacpi_hotplug_wq);
	acpi_osi_init();
	return AE_OK;
}

acpi_status acpi_os_terminate(void)
{
	if (acpi_irq_handler) {
		acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
						 acpi_irq_handler);
	}

	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
	if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
		acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);

	destroy_workqueue(kacpid_wq);
	destroy_workqueue(kacpi_notify_wq);
	destroy_workqueue(kacpi_hotplug_wq);

	return AE_OK;
}

acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
				  u32 pm1b_control)
{
	int rc = 0;
	if (__acpi_os_prepare_sleep)
		rc = __acpi_os_prepare_sleep(sleep_state,
					     pm1a_control, pm1b_control);
	if (rc < 0)
		return AE_ERROR;
	else if (rc > 0)
		return AE_CTRL_TERMINATE;

	return AE_OK;
}

void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
			       u32 pm1a_ctrl, u32 pm1b_ctrl))
{
	__acpi_os_prepare_sleep = func;
}

#if (ACPI_REDUCED_HARDWARE)
acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
				  u32 val_b)
{
	int rc = 0;
	if (__acpi_os_prepare_extended_sleep)
		rc = __acpi_os_prepare_extended_sleep(sleep_state,
					     val_a, val_b);
	if (rc < 0)
		return AE_ERROR;
	else if (rc > 0)
		return AE_CTRL_TERMINATE;

	return AE_OK;
}
#else
acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
				  u32 val_b)
{
	return AE_OK;
}
#endif

void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
			       u32 val_a, u32 val_b))
{
	__acpi_os_prepare_extended_sleep = func;
}

acpi_status acpi_os_enter_sleep(u8 sleep_state,
				u32 reg_a_value, u32 reg_b_value)
{
	acpi_status status;

	if (acpi_gbl_reduced_hardware)
		status = acpi_os_prepare_extended_sleep(sleep_state,
							reg_a_value,
							reg_b_value);
	else
		status = acpi_os_prepare_sleep(sleep_state,
					       reg_a_value, reg_b_value);
	return status;
}