summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/acpi/boot.c
blob: 06635fbca81c0359c170bc1ef2266e499f526983 (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
/*
 *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@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/init.h>
#include <linux/acpi.h>
#include <linux/acpi_pmtmr.h>
#include <linux/efi.h>
#include <linux/cpumask.h>
#include <linux/export.h>
#include <linux/dmi.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/memblock.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/efi-bgrt.h>
#include <linux/serial_core.h>

#include <asm/e820/api.h>
#include <asm/irqdomain.h>
#include <asm/pci_x86.h>
#include <asm/pgtable.h>
#include <asm/io_apic.h>
#include <asm/apic.h>
#include <asm/io.h>
#include <asm/mpspec.h>
#include <asm/smp.h>
#include <asm/i8259.h>
#include <asm/setup.h>

#include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
static int __initdata acpi_force = 0;
int acpi_disabled;
EXPORT_SYMBOL(acpi_disabled);

#ifdef	CONFIG_X86_64
# include <asm/proto.h>
#endif				/* X86 */

#define PREFIX			"ACPI: "

int acpi_noirq;				/* skip ACPI IRQ initialization */
int acpi_pci_disabled;		/* skip ACPI PCI scan and IRQ initialization */
EXPORT_SYMBOL(acpi_pci_disabled);

int acpi_lapic;
int acpi_ioapic;
int acpi_strict;
int acpi_disable_cmcff;

/* ACPI SCI override configuration */
u8 acpi_sci_flags __initdata;
u32 acpi_sci_override_gsi __initdata = INVALID_ACPI_IRQ;
int acpi_skip_timer_override __initdata;
int acpi_use_timer_override __initdata;
int acpi_fix_pin2_polarity __initdata;

#ifdef CONFIG_X86_LOCAL_APIC
static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
#endif

#ifdef CONFIG_X86_IO_APIC
/*
 * Locks related to IOAPIC hotplug
 * Hotplug side:
 *	->device_hotplug_lock
 *		->acpi_ioapic_lock
 *			->ioapic_lock
 * Interrupt mapping side:
 *	->acpi_ioapic_lock
 *		->ioapic_mutex
 *			->ioapic_lock
 */
static DEFINE_MUTEX(acpi_ioapic_lock);
#endif

/* --------------------------------------------------------------------------
                              Boot-time Configuration
   -------------------------------------------------------------------------- */

/*
 * The default interrupt routing model is PIC (8259).  This gets
 * overridden if IOAPICs are enumerated (below).
 */
enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;


/*
 * ISA irqs by default are the first 16 gsis but can be
 * any gsi as specified by an interrupt source override.
 */
static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
};

/*
 * This is just a simple wrapper around early_memremap(),
 * with sanity checks for phys == 0 and size == 0.
 */
void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
{

	if (!phys || !size)
		return NULL;

	return early_memremap(phys, size);
}

void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
{
	if (!map || !size)
		return;

	early_memunmap(map, size);
}

#ifdef CONFIG_X86_LOCAL_APIC
static int __init acpi_parse_madt(struct acpi_table_header *table)
{
	struct acpi_table_madt *madt = NULL;

	if (!boot_cpu_has(X86_FEATURE_APIC))
		return -EINVAL;

	madt = (struct acpi_table_madt *)table;
	if (!madt) {
		printk(KERN_WARNING PREFIX "Unable to map MADT\n");
		return -ENODEV;
	}

	if (madt->address) {
		acpi_lapic_addr = (u64) madt->address;

		printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
		       madt->address);
	}

	default_acpi_madt_oem_check(madt->header.oem_id,
				    madt->header.oem_table_id);

	return 0;
}

/**
 * acpi_register_lapic - register a local apic and generates a logic cpu number
 * @id: local apic id to register
 * @acpiid: ACPI id to register
 * @enabled: this cpu is enabled or not
 *
 * Returns the logic cpu number which maps to the local apic
 */
static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
{
	unsigned int ver = 0;
	int cpu;

	if (id >= MAX_LOCAL_APIC) {
		printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
		return -EINVAL;
	}

	if (!enabled) {
		++disabled_cpus;
		return -EINVAL;
	}

	if (boot_cpu_physical_apicid != -1U)
		ver = boot_cpu_apic_version;

	cpu = generic_processor_info(id, ver);
	if (cpu >= 0)
		early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;

	return cpu;
}

static int __init
acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
{
	struct acpi_madt_local_x2apic *processor = NULL;
#ifdef CONFIG_X86_X2APIC
	u32 apic_id;
	u8 enabled;
#endif

	processor = (struct acpi_madt_local_x2apic *)header;

	if (BAD_MADT_ENTRY(processor, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

#ifdef CONFIG_X86_X2APIC
	apic_id = processor->local_apic_id;
	enabled = processor->lapic_flags & ACPI_MADT_ENABLED;

	/* Ignore invalid ID */
	if (apic_id == 0xffffffff)
		return 0;

	/*
	 * We need to register disabled CPU as well to permit
	 * counting disabled CPUs. This allows us to size
	 * cpus_possible_map more accurately, to permit
	 * to not preallocating memory for all NR_CPUS
	 * when we use CPU hotplug.
	 */
	if (!apic->apic_id_valid(apic_id)) {
		if (enabled)
			pr_warn(PREFIX "x2apic entry ignored\n");
		return 0;
	}

	acpi_register_lapic(apic_id, processor->uid, enabled);
#else
	printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
#endif

	return 0;
}

static int __init
acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
{
	struct acpi_madt_local_apic *processor = NULL;

	processor = (struct acpi_madt_local_apic *)header;

	if (BAD_MADT_ENTRY(processor, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	/* Ignore invalid ID */
	if (processor->id == 0xff)
		return 0;

	/*
	 * We need to register disabled CPU as well to permit
	 * counting disabled CPUs. This allows us to size
	 * cpus_possible_map more accurately, to permit
	 * to not preallocating memory for all NR_CPUS
	 * when we use CPU hotplug.
	 */
	acpi_register_lapic(processor->id,	/* APIC ID */
			    processor->processor_id, /* ACPI ID */
			    processor->lapic_flags & ACPI_MADT_ENABLED);

	return 0;
}

static int __init
acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
{
	struct acpi_madt_local_sapic *processor = NULL;

	processor = (struct acpi_madt_local_sapic *)header;

	if (BAD_MADT_ENTRY(processor, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
			    processor->processor_id, /* ACPI ID */
			    processor->lapic_flags & ACPI_MADT_ENABLED);

	return 0;
}

static int __init
acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
			  const unsigned long end)
{
	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;

	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;

	if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	acpi_lapic_addr = lapic_addr_ovr->address;

	return 0;
}

static int __init
acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
		      const unsigned long end)
{
	struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;

	x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;

	if (BAD_MADT_ENTRY(x2apic_nmi, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	if (x2apic_nmi->lint != 1)
		printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");

	return 0;
}

static int __init
acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
{
	struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;

	lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;

	if (BAD_MADT_ENTRY(lapic_nmi, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	if (lapic_nmi->lint != 1)
		printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");

	return 0;
}

#endif				/*CONFIG_X86_LOCAL_APIC */

#ifdef CONFIG_X86_IO_APIC
#define MP_ISA_BUS		0

static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
						u8 trigger, u32 gsi);

static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
					  u32 gsi)
{
	/*
	 * Check bus_irq boundary.
	 */
	if (bus_irq >= NR_IRQS_LEGACY) {
		pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
		return;
	}

	/*
	 * TBD: This check is for faulty timer entries, where the override
	 *      erroneously sets the trigger to level, resulting in a HUGE
	 *      increase of timer interrupts!
	 */
	if ((bus_irq == 0) && (trigger == 3))
		trigger = 1;

	if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
		return;
	/*
	 * Reset default identity mapping if gsi is also an legacy IRQ,
	 * otherwise there will be more than one entry with the same GSI
	 * and acpi_isa_irq_to_gsi() may give wrong result.
	 */
	if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
		isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
	isa_irq_to_gsi[bus_irq] = gsi;
}

static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
			int polarity)
{
#ifdef CONFIG_X86_MPPARSE
	struct mpc_intsrc mp_irq;
	struct pci_dev *pdev;
	unsigned char number;
	unsigned int devfn;
	int ioapic;
	u8 pin;

	if (!acpi_ioapic)
		return 0;
	if (!dev || !dev_is_pci(dev))
		return 0;

	pdev = to_pci_dev(dev);
	number = pdev->bus->number;
	devfn = pdev->devfn;
	pin = pdev->pin;
	/* print the entry should happen on mptable identically */
	mp_irq.type = MP_INTSRC;
	mp_irq.irqtype = mp_INT;
	mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
				(polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
	mp_irq.srcbus = number;
	mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
	ioapic = mp_find_ioapic(gsi);
	mp_irq.dstapic = mpc_ioapic_id(ioapic);
	mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);

	mp_save_irq(&mp_irq);
#endif
	return 0;
}

static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
						u8 trigger, u32 gsi)
{
	struct mpc_intsrc mp_irq;
	int ioapic, pin;

	/* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
	ioapic = mp_find_ioapic(gsi);
	if (ioapic < 0) {
		pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
		return ioapic;
	}

	pin = mp_find_ioapic_pin(ioapic, gsi);

	mp_irq.type = MP_INTSRC;
	mp_irq.irqtype = mp_INT;
	mp_irq.irqflag = (trigger << 2) | polarity;
	mp_irq.srcbus = MP_ISA_BUS;
	mp_irq.srcbusirq = bus_irq;
	mp_irq.dstapic = mpc_ioapic_id(ioapic);
	mp_irq.dstirq = pin;

	mp_save_irq(&mp_irq);

	return 0;
}

static int __init
acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
{
	struct acpi_madt_io_apic *ioapic = NULL;
	struct ioapic_domain_cfg cfg = {
		.type = IOAPIC_DOMAIN_DYNAMIC,
		.ops = &mp_ioapic_irqdomain_ops,
	};

	ioapic = (struct acpi_madt_io_apic *)header;

	if (BAD_MADT_ENTRY(ioapic, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	/* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
	if (ioapic->global_irq_base < nr_legacy_irqs())
		cfg.type = IOAPIC_DOMAIN_LEGACY;

	mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
			   &cfg);

	return 0;
}

/*
 * Parse Interrupt Source Override for the ACPI SCI
 */
static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
{
	if (trigger == 0)	/* compatible SCI trigger is level */
		trigger = 3;

	if (polarity == 0)	/* compatible SCI polarity is low */
		polarity = 3;

	/* Command-line over-ride via acpi_sci= */
	if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
		trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;

	if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
		polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;

	if (bus_irq < NR_IRQS_LEGACY)
		mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
	else
		mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);

	acpi_penalize_sci_irq(bus_irq, trigger, polarity);

	/*
	 * stash over-ride to indicate we've been here
	 * and for later update of acpi_gbl_FADT
	 */
	acpi_sci_override_gsi = gsi;
	return;
}

static int __init
acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
		       const unsigned long end)
{
	struct acpi_madt_interrupt_override *intsrc = NULL;

	intsrc = (struct acpi_madt_interrupt_override *)header;

	if (BAD_MADT_ENTRY(intsrc, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
		acpi_sci_ioapic_setup(intsrc->source_irq,
				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
				      intsrc->global_irq);
		return 0;
	}

	if (intsrc->source_irq == 0) {
		if (acpi_skip_timer_override) {
			printk(PREFIX "BIOS IRQ0 override ignored.\n");
			return 0;
		}

		if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
			&& (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
			intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
			printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
		}
	}

	mp_override_legacy_irq(intsrc->source_irq,
				intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
				(intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
				intsrc->global_irq);

	return 0;
}

static int __init
acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
{
	struct acpi_madt_nmi_source *nmi_src = NULL;

	nmi_src = (struct acpi_madt_nmi_source *)header;

	if (BAD_MADT_ENTRY(nmi_src, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	/* TBD: Support nimsrc entries? */

	return 0;
}

#endif				/* CONFIG_X86_IO_APIC */

/*
 * acpi_pic_sci_set_trigger()
 *
 * use ELCR to set PIC-mode trigger type for SCI
 *
 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 * it may require Edge Trigger -- use "acpi_sci=edge"
 *
 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
 */

void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
{
	unsigned int mask = 1 << irq;
	unsigned int old, new;

	/* Real old ELCR mask */
	old = inb(0x4d0) | (inb(0x4d1) << 8);

	/*
	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
	 * since we will set it correctly as we enable the PCI irq
	 * routing.
	 */
	new = acpi_noirq ? old : 0;

	/*
	 * Update SCI information in the ELCR, it isn't in the PCI
	 * routing tables..
	 */
	switch (trigger) {
	case 1:		/* Edge - clear */
		new &= ~mask;
		break;
	case 3:		/* Level - set */
		new |= mask;
		break;
	}

	if (old == new)
		return;

	printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
	outb(new, 0x4d0);
	outb(new >> 8, 0x4d1);
}

int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
{
	int rc, irq, trigger, polarity;

	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
		*irqp = gsi;
		return 0;
	}

	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
	if (rc)
		return rc;

	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
	irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
	if (irq < 0)
		return irq;

	*irqp = irq;
	return 0;
}
EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);

int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
{
	if (isa_irq < nr_legacy_irqs() &&
	    isa_irq_to_gsi[isa_irq] != INVALID_ACPI_IRQ) {
		*gsi = isa_irq_to_gsi[isa_irq];
		return 0;
	}

	return -1;
}

static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
				 int trigger, int polarity)
{
#ifdef CONFIG_PCI
	/*
	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
	 */
	if (trigger == ACPI_LEVEL_SENSITIVE)
		elcr_set_level_irq(gsi);
#endif

	return gsi;
}

#ifdef CONFIG_X86_LOCAL_APIC
static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
				    int trigger, int polarity)
{
	int irq = gsi;
#ifdef CONFIG_X86_IO_APIC
	int node;
	struct irq_alloc_info info;

	node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
	trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
	polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
	ioapic_set_alloc_attr(&info, node, trigger, polarity);

	mutex_lock(&acpi_ioapic_lock);
	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
	/* Don't set up the ACPI SCI because it's already set up */
	if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
		mp_config_acpi_gsi(dev, gsi, trigger, polarity);
	mutex_unlock(&acpi_ioapic_lock);
#endif

	return irq;
}

static void acpi_unregister_gsi_ioapic(u32 gsi)
{
#ifdef CONFIG_X86_IO_APIC
	int irq;

	mutex_lock(&acpi_ioapic_lock);
	irq = mp_map_gsi_to_irq(gsi, 0, NULL);
	if (irq > 0)
		mp_unmap_irq(irq);
	mutex_unlock(&acpi_ioapic_lock);
#endif
}
#endif

int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
			   int trigger, int polarity) = acpi_register_gsi_pic;
void (*__acpi_unregister_gsi)(u32 gsi) = NULL;

#ifdef CONFIG_ACPI_SLEEP
int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
#else
int (*acpi_suspend_lowlevel)(void);
#endif

/*
 * success: return IRQ number (>=0)
 * failure: return < 0
 */
int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
{
	return __acpi_register_gsi(dev, gsi, trigger, polarity);
}
EXPORT_SYMBOL_GPL(acpi_register_gsi);

void acpi_unregister_gsi(u32 gsi)
{
	if (__acpi_unregister_gsi)
		__acpi_unregister_gsi(gsi);
}
EXPORT_SYMBOL_GPL(acpi_unregister_gsi);

#ifdef CONFIG_X86_LOCAL_APIC
static void __init acpi_set_irq_model_ioapic(void)
{
	acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
	__acpi_register_gsi = acpi_register_gsi_ioapic;
	__acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
	acpi_ioapic = 1;
}
#endif

/*
 *  ACPI based hotplug support for CPU
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
#include <acpi/processor.h>

static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
{
#ifdef CONFIG_ACPI_NUMA
	int nid;

	nid = acpi_get_node(handle);
	if (nid != NUMA_NO_NODE) {
		set_apicid_to_node(physid, nid);
		numa_set_node(cpu, nid);
	}
#endif
	return 0;
}

int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
		 int *pcpu)
{
	int cpu;

	cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
	if (cpu < 0) {
		pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
		return cpu;
	}

	acpi_processor_set_pdc(handle);
	acpi_map_cpu2node(handle, cpu, physid);

	*pcpu = cpu;
	return 0;
}
EXPORT_SYMBOL(acpi_map_cpu);

int acpi_unmap_cpu(int cpu)
{
#ifdef CONFIG_ACPI_NUMA
	set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
#endif

	per_cpu(x86_cpu_to_apicid, cpu) = -1;
	set_cpu_present(cpu, false);
	num_processors--;

	return (0);
}
EXPORT_SYMBOL(acpi_unmap_cpu);
#endif				/* CONFIG_ACPI_HOTPLUG_CPU */

int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
{
	int ret = -ENOSYS;
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
	int ioapic_id;
	u64 addr;
	struct ioapic_domain_cfg cfg = {
		.type = IOAPIC_DOMAIN_DYNAMIC,
		.ops = &mp_ioapic_irqdomain_ops,
	};

	ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
	if (ioapic_id < 0) {
		unsigned long long uid;
		acpi_status status;

		status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
					       NULL, &uid);
		if (ACPI_FAILURE(status)) {
			acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
			return -EINVAL;
		}
		ioapic_id = (int)uid;
	}

	mutex_lock(&acpi_ioapic_lock);
	ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
	mutex_unlock(&acpi_ioapic_lock);
#endif

	return ret;
}
EXPORT_SYMBOL(acpi_register_ioapic);

int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
{
	int ret = -ENOSYS;

#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
	mutex_lock(&acpi_ioapic_lock);
	ret  = mp_unregister_ioapic(gsi_base);
	mutex_unlock(&acpi_ioapic_lock);
#endif

	return ret;
}
EXPORT_SYMBOL(acpi_unregister_ioapic);

/**
 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
 *			    has been registered
 * @handle:	ACPI handle of the IOAPIC deivce
 * @gsi_base:	GSI base associated with the IOAPIC
 *
 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
 * with acpi_register_ioapic()/acpi_unregister_ioapic().
 */
int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
{
	int ret = 0;

#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
	mutex_lock(&acpi_ioapic_lock);
	ret  = mp_ioapic_registered(gsi_base);
	mutex_unlock(&acpi_ioapic_lock);
#endif

	return ret;
}

static int __init acpi_parse_sbf(struct acpi_table_header *table)
{
	struct acpi_table_boot *sb = (struct acpi_table_boot *)table;

	sbf_port = sb->cmos_index;	/* Save CMOS port */

	return 0;
}

#ifdef CONFIG_HPET_TIMER
#include <asm/hpet.h>

static struct resource *hpet_res __initdata;

static int __init acpi_parse_hpet(struct acpi_table_header *table)
{
	struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;

	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
		printk(KERN_WARNING PREFIX "HPET timers must be located in "
		       "memory.\n");
		return -1;
	}

	hpet_address = hpet_tbl->address.address;
	hpet_blockid = hpet_tbl->sequence;

	/*
	 * Some broken BIOSes advertise HPET at 0x0. We really do not
	 * want to allocate a resource there.
	 */
	if (!hpet_address) {
		printk(KERN_WARNING PREFIX
		       "HPET id: %#x base: %#lx is invalid\n",
		       hpet_tbl->id, hpet_address);
		return 0;
	}
#ifdef CONFIG_X86_64
	/*
	 * Some even more broken BIOSes advertise HPET at
	 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
	 * some noise:
	 */
	if (hpet_address == 0xfed0000000000000UL) {
		if (!hpet_force_user) {
			printk(KERN_WARNING PREFIX "HPET id: %#x "
			       "base: 0xfed0000000000000 is bogus\n "
			       "try hpet=force on the kernel command line to "
			       "fix it up to 0xfed00000.\n", hpet_tbl->id);
			hpet_address = 0;
			return 0;
		}
		printk(KERN_WARNING PREFIX
		       "HPET id: %#x base: 0xfed0000000000000 fixed up "
		       "to 0xfed00000.\n", hpet_tbl->id);
		hpet_address >>= 32;
	}
#endif
	printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
	       hpet_tbl->id, hpet_address);

	/*
	 * Allocate and initialize the HPET firmware resource for adding into
	 * the resource tree during the lateinit timeframe.
	 */
#define HPET_RESOURCE_NAME_SIZE 9
	hpet_res = memblock_alloc(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE,
				  SMP_CACHE_BYTES);

	hpet_res->name = (void *)&hpet_res[1];
	hpet_res->flags = IORESOURCE_MEM;
	snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
		 hpet_tbl->sequence);

	hpet_res->start = hpet_address;
	hpet_res->end = hpet_address + (1 * 1024) - 1;

	return 0;
}

/*
 * hpet_insert_resource inserts the HPET resources used into the resource
 * tree.
 */
static __init int hpet_insert_resource(void)
{
	if (!hpet_res)
		return 1;

	return insert_resource(&iomem_resource, hpet_res);
}

late_initcall(hpet_insert_resource);

#else
#define	acpi_parse_hpet	NULL
#endif

static int __init acpi_parse_fadt(struct acpi_table_header *table)
{
	if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
		pr_debug("ACPI: no legacy devices present\n");
		x86_platform.legacy.devices.pnpbios = 0;
	}

	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
	    !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
	    x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
		pr_debug("ACPI: i8042 controller is absent\n");
		x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
	}

	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
		pr_debug("ACPI: not registering RTC platform device\n");
		x86_platform.legacy.rtc = 0;
	}

	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
		pr_debug("ACPI: probing for VGA not safe\n");
		x86_platform.legacy.no_vga = 1;
	}

#ifdef CONFIG_X86_PM_TIMER
	/* detect the location of the ACPI PM Timer */
	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
		/* FADT rev. 2 */
		if (acpi_gbl_FADT.xpm_timer_block.space_id !=
		    ACPI_ADR_SPACE_SYSTEM_IO)
			return 0;

		pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
		/*
		 * "X" fields are optional extensions to the original V1.0
		 * fields, so we must selectively expand V1.0 fields if the
		 * corresponding X field is zero.
	 	 */
		if (!pmtmr_ioport)
			pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
	} else {
		/* FADT rev. 1 */
		pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
	}
	if (pmtmr_ioport)
		printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
		       pmtmr_ioport);
#endif
	return 0;
}

#ifdef	CONFIG_X86_LOCAL_APIC
/*
 * Parse LAPIC entries in MADT
 * returns 0 on success, < 0 on error
 */

static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
{
	int count;

	if (!boot_cpu_has(X86_FEATURE_APIC))
		return -ENODEV;

	/*
	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
	 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
	 */

	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
				      acpi_parse_lapic_addr_ovr, 0);
	if (count < 0) {
		printk(KERN_ERR PREFIX
		       "Error parsing LAPIC address override entry\n");
		return count;
	}

	register_lapic_address(acpi_lapic_addr);

	return count;
}

static int __init acpi_parse_madt_lapic_entries(void)
{
	int count;
	int x2count = 0;
	int ret;
	struct acpi_subtable_proc madt_proc[2];

	if (!boot_cpu_has(X86_FEATURE_APIC))
		return -ENODEV;

	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
				      acpi_parse_sapic, MAX_LOCAL_APIC);

	if (!count) {
		memset(madt_proc, 0, sizeof(madt_proc));
		madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
		madt_proc[0].handler = acpi_parse_lapic;
		madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
		madt_proc[1].handler = acpi_parse_x2apic;
		ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
				sizeof(struct acpi_table_madt),
				madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
		if (ret < 0) {
			printk(KERN_ERR PREFIX
					"Error parsing LAPIC/X2APIC entries\n");
			return ret;
		}

		count = madt_proc[0].count;
		x2count = madt_proc[1].count;
	}
	if (!count && !x2count) {
		printk(KERN_ERR PREFIX "No LAPIC entries present\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return -ENODEV;
	} else if (count < 0 || x2count < 0) {
		printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}

	x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
					acpi_parse_x2apic_nmi, 0);
	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
				      acpi_parse_lapic_nmi, 0);
	if (count < 0 || x2count < 0) {
		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}
	return 0;
}
#endif				/* CONFIG_X86_LOCAL_APIC */

#ifdef	CONFIG_X86_IO_APIC
static void __init mp_config_acpi_legacy_irqs(void)
{
	int i;
	struct mpc_intsrc mp_irq;

#ifdef CONFIG_EISA
	/*
	 * Fabricate the legacy ISA bus (bus #31).
	 */
	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
#endif
	set_bit(MP_ISA_BUS, mp_bus_not_pci);
	pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());

	/*
	 * Use the default configuration for the IRQs 0-15.  Unless
	 * overridden by (MADT) interrupt source override entries.
	 */
	for (i = 0; i < nr_legacy_irqs(); i++) {
		int ioapic, pin;
		unsigned int dstapic;
		int idx;
		u32 gsi;

		/* Locate the gsi that irq i maps to. */
		if (acpi_isa_irq_to_gsi(i, &gsi))
			continue;

		/*
		 * Locate the IOAPIC that manages the ISA IRQ.
		 */
		ioapic = mp_find_ioapic(gsi);
		if (ioapic < 0)
			continue;
		pin = mp_find_ioapic_pin(ioapic, gsi);
		dstapic = mpc_ioapic_id(ioapic);

		for (idx = 0; idx < mp_irq_entries; idx++) {
			struct mpc_intsrc *irq = mp_irqs + idx;

			/* Do we already have a mapping for this ISA IRQ? */
			if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
				break;

			/* Do we already have a mapping for this IOAPIC pin */
			if (irq->dstapic == dstapic && irq->dstirq == pin)
				break;
		}

		if (idx != mp_irq_entries) {
			printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
			continue;	/* IRQ already used */
		}

		mp_irq.type = MP_INTSRC;
		mp_irq.irqflag = 0;	/* Conforming */
		mp_irq.srcbus = MP_ISA_BUS;
		mp_irq.dstapic = dstapic;
		mp_irq.irqtype = mp_INT;
		mp_irq.srcbusirq = i; /* Identity mapped */
		mp_irq.dstirq = pin;

		mp_save_irq(&mp_irq);
	}
}

/*
 * Parse IOAPIC related entries in MADT
 * returns 0 on success, < 0 on error
 */
static int __init acpi_parse_madt_ioapic_entries(void)
{
	int count;

	/*
	 * ACPI interpreter is required to complete interrupt setup,
	 * so if it is off, don't enumerate the io-apics with ACPI.
	 * If MPS is present, it will handle them,
	 * otherwise the system will stay in PIC mode
	 */
	if (acpi_disabled || acpi_noirq)
		return -ENODEV;

	if (!boot_cpu_has(X86_FEATURE_APIC))
		return -ENODEV;

	/*
	 * if "noapic" boot option, don't look for IO-APICs
	 */
	if (skip_ioapic_setup) {
		printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
		       "due to 'noapic' option.\n");
		return -ENODEV;
	}

	count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
				      MAX_IO_APICS);
	if (!count) {
		printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
		return -ENODEV;
	} else if (count < 0) {
		printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
		return count;
	}

	count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
				      acpi_parse_int_src_ovr, nr_irqs);
	if (count < 0) {
		printk(KERN_ERR PREFIX
		       "Error parsing interrupt source overrides entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}

	/*
	 * If BIOS did not supply an INT_SRC_OVR for the SCI
	 * pretend we got one so we can set the SCI flags.
	 * But ignore setting up SCI on hardware reduced platforms.
	 */
	if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
		acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
				      acpi_gbl_FADT.sci_interrupt);

	/* Fill in identity legacy mappings where no override */
	mp_config_acpi_legacy_irqs();

	count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
				      acpi_parse_nmi_src, nr_irqs);
	if (count < 0) {
		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}

	return 0;
}
#else
static inline int acpi_parse_madt_ioapic_entries(void)
{
	return -1;
}
#endif	/* !CONFIG_X86_IO_APIC */

static void __init early_acpi_process_madt(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
	int error;

	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {

		/*
		 * Parse MADT LAPIC entries
		 */
		error = early_acpi_parse_madt_lapic_addr_ovr();
		if (!error) {
			acpi_lapic = 1;
			smp_found_config = 1;
		}
		if (error == -EINVAL) {
			/*
			 * Dell Precision Workstation 410, 610 come here.
			 */
			printk(KERN_ERR PREFIX
			       "Invalid BIOS MADT, disabling ACPI\n");
			disable_acpi();
		}
	}
#endif
}

static void __init acpi_process_madt(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
	int error;

	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {

		/*
		 * Parse MADT LAPIC entries
		 */
		error = acpi_parse_madt_lapic_entries();
		if (!error) {
			acpi_lapic = 1;

			/*
			 * Parse MADT IO-APIC entries
			 */
			mutex_lock(&acpi_ioapic_lock);
			error = acpi_parse_madt_ioapic_entries();
			mutex_unlock(&acpi_ioapic_lock);
			if (!error) {
				acpi_set_irq_model_ioapic();

				smp_found_config = 1;
			}
		}
		if (error == -EINVAL) {
			/*
			 * Dell Precision Workstation 410, 610 come here.
			 */
			printk(KERN_ERR PREFIX
			       "Invalid BIOS MADT, disabling ACPI\n");
			disable_acpi();
		}
	} else {
		/*
 		 * ACPI found no MADT, and so ACPI wants UP PIC mode.
 		 * In the event an MPS table was found, forget it.
 		 * Boot with "acpi=off" to use MPS on such a system.
 		 */
		if (smp_found_config) {
			printk(KERN_WARNING PREFIX
				"No APIC-table, disabling MPS\n");
			smp_found_config = 0;
		}
	}

	/*
	 * ACPI supports both logical (e.g. Hyper-Threading) and physical
	 * processors, where MPS only supports physical.
	 */
	if (acpi_lapic && acpi_ioapic)
		printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
		       "information\n");
	else if (acpi_lapic)
		printk(KERN_INFO "Using ACPI for processor (LAPIC) "
		       "configuration information\n");
#endif
	return;
}

static int __init disable_acpi_irq(const struct dmi_system_id *d)
{
	if (!acpi_force) {
		printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
		       d->ident);
		acpi_noirq_set();
	}
	return 0;
}

static int __init disable_acpi_pci(const struct dmi_system_id *d)
{
	if (!acpi_force) {
		printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
		       d->ident);
		acpi_disable_pci();
	}
	return 0;
}

static int __init dmi_disable_acpi(const struct dmi_system_id *d)
{
	if (!acpi_force) {
		printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
		disable_acpi();
	} else {
		printk(KERN_NOTICE
		       "Warning: DMI blacklist says broken, but acpi forced\n");
	}
	return 0;
}

/*
 * Force ignoring BIOS IRQ0 override
 */
static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
{
	if (!acpi_skip_timer_override) {
		pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
			d->ident);
		acpi_skip_timer_override = 1;
	}
	return 0;
}

/*
 * ACPI offers an alternative platform interface model that removes
 * ACPI hardware requirements for platforms that do not implement
 * the PC Architecture.
 *
 * We initialize the Hardware-reduced ACPI model here:
 */
void __init acpi_generic_reduced_hw_init(void)
{
	/*
	 * Override x86_init functions and bypass legacy PIC in
	 * hardware reduced ACPI mode.
	 */
	x86_init.timers.timer_init	= x86_init_noop;
	x86_init.irqs.pre_vector_init	= x86_init_noop;
	legacy_pic			= &null_legacy_pic;
}

static void __init acpi_reduced_hw_init(void)
{
	if (acpi_gbl_reduced_hardware)
		x86_init.acpi.reduced_hw_early_init();
}

/*
 * If your system is blacklisted here, but you find that acpi=force
 * works for you, please contact linux-acpi@vger.kernel.org
 */
static const struct dmi_system_id acpi_dmi_table[] __initconst = {
	/*
	 * Boxes that need ACPI disabled
	 */
	{
	 .callback = dmi_disable_acpi,
	 .ident = "IBM Thinkpad",
	 .matches = {
		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
		     DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
		     },
	 },

	/*
	 * Boxes that need ACPI PCI IRQ routing disabled
	 */
	{
	 .callback = disable_acpi_irq,
	 .ident = "ASUS A7V",
	 .matches = {
		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
		     DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
		     /* newer BIOS, Revision 1011, does work */
		     DMI_MATCH(DMI_BIOS_VERSION,
			       "ASUS A7V ACPI BIOS Revision 1007"),
		     },
	 },
	{
		/*
		 * Latest BIOS for IBM 600E (1.16) has bad pcinum
		 * for LPC bridge, which is needed for the PCI
		 * interrupt links to work. DSDT fix is in bug 5966.
		 * 2645, 2646 model numbers are shared with 600/600E/600X
		 */
	 .callback = disable_acpi_irq,
	 .ident = "IBM Thinkpad 600 Series 2645",
	 .matches = {
		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
		     DMI_MATCH(DMI_BOARD_NAME, "2645"),
		     },
	 },
	{
	 .callback = disable_acpi_irq,
	 .ident = "IBM Thinkpad 600 Series 2646",
	 .matches = {
		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
		     DMI_MATCH(DMI_BOARD_NAME, "2646"),
		     },
	 },
	/*
	 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
	 */
	{			/* _BBN 0 bug */
	 .callback = disable_acpi_pci,
	 .ident = "ASUS PR-DLS",
	 .matches = {
		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
		     DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
		     DMI_MATCH(DMI_BIOS_VERSION,
			       "ASUS PR-DLS ACPI BIOS Revision 1010"),
		     DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
		     },
	 },
	{
	 .callback = disable_acpi_pci,
	 .ident = "Acer TravelMate 36x Laptop",
	 .matches = {
		     DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
		     },
	 },
	{}
};

/* second table for DMI checks that should run after early-quirks */
static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
	/*
	 * HP laptops which use a DSDT reporting as HP/SB400/10000,
	 * which includes some code which overrides all temperature
	 * trip points to 16C if the INTIN2 input of the I/O APIC
	 * is enabled.  This input is incorrectly designated the
	 * ISA IRQ 0 via an interrupt source override even though
	 * it is wired to the output of the master 8259A and INTIN0
	 * is not connected at all.  Force ignoring BIOS IRQ0
	 * override in that cases.
	 */
	{
	 .callback = dmi_ignore_irq0_timer_override,
	 .ident = "HP nx6115 laptop",
	 .matches = {
		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
		     },
	 },
	{
	 .callback = dmi_ignore_irq0_timer_override,
	 .ident = "HP NX6125 laptop",
	 .matches = {
		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
		     },
	 },
	{
	 .callback = dmi_ignore_irq0_timer_override,
	 .ident = "HP NX6325 laptop",
	 .matches = {
		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
		     },
	 },
	{
	 .callback = dmi_ignore_irq0_timer_override,
	 .ident = "HP 6715b laptop",
	 .matches = {
		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
		     },
	 },
	{
	 .callback = dmi_ignore_irq0_timer_override,
	 .ident = "FUJITSU SIEMENS",
	 .matches = {
		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
		     DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
		     },
	 },
	{}
};

/*
 * acpi_boot_table_init() and acpi_boot_init()
 *  called from setup_arch(), always.
 *	1. checksums all tables
 *	2. enumerates lapics
 *	3. enumerates io-apics
 *
 * acpi_table_init() is separate to allow reading SRAT without
 * other side effects.
 *
 * side effects of acpi_boot_init:
 *	acpi_lapic = 1 if LAPIC found
 *	acpi_ioapic = 1 if IOAPIC found
 *	if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
 *	if acpi_blacklisted() acpi_disabled = 1;
 *	acpi_irq_model=...
 *	...
 */

void __init acpi_boot_table_init(void)
{
	dmi_check_system(acpi_dmi_table);

	/*
	 * If acpi_disabled, bail out
	 */
	if (acpi_disabled)
		return;

	/*
	 * Initialize the ACPI boot-time table parser.
	 */
	if (acpi_table_init()) {
		disable_acpi();
		return;
	}

	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);

	/*
	 * blacklist may disable ACPI entirely
	 */
	if (acpi_blacklisted()) {
		if (acpi_force) {
			printk(KERN_WARNING PREFIX "acpi=force override\n");
		} else {
			printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
			disable_acpi();
			return;
		}
	}
}

int __init early_acpi_boot_init(void)
{
	/*
	 * If acpi_disabled, bail out
	 */
	if (acpi_disabled)
		return 1;

	/*
	 * Process the Multiple APIC Description Table (MADT), if present
	 */
	early_acpi_process_madt();

	/*
	 * Hardware-reduced ACPI mode initialization:
	 */
	acpi_reduced_hw_init();

	return 0;
}

int __init acpi_boot_init(void)
{
	/* those are executed after early-quirks are executed */
	dmi_check_system(acpi_dmi_table_late);

	/*
	 * If acpi_disabled, bail out
	 */
	if (acpi_disabled)
		return 1;

	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);

	/*
	 * set sci_int and PM timer address
	 */
	acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);

	/*
	 * Process the Multiple APIC Description Table (MADT), if present
	 */
	acpi_process_madt();

	acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
	if (IS_ENABLED(CONFIG_ACPI_BGRT))
		acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);

	if (!acpi_noirq)
		x86_init.pci.init = pci_acpi_init;

	/* Do not enable ACPI SPCR console by default */
	acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
	return 0;
}

static int __init parse_acpi(char *arg)
{
	if (!arg)
		return -EINVAL;

	/* "acpi=off" disables both ACPI table parsing and interpreter */
	if (strcmp(arg, "off") == 0) {
		disable_acpi();
	}
	/* acpi=force to over-ride black-list */
	else if (strcmp(arg, "force") == 0) {
		acpi_force = 1;
		acpi_disabled = 0;
	}
	/* acpi=strict disables out-of-spec workarounds */
	else if (strcmp(arg, "strict") == 0) {
		acpi_strict = 1;
	}
	/* acpi=rsdt use RSDT instead of XSDT */
	else if (strcmp(arg, "rsdt") == 0) {
		acpi_gbl_do_not_use_xsdt = TRUE;
	}
	/* "acpi=noirq" disables ACPI interrupt routing */
	else if (strcmp(arg, "noirq") == 0) {
		acpi_noirq_set();
	}
	/* "acpi=copy_dsdt" copys DSDT */
	else if (strcmp(arg, "copy_dsdt") == 0) {
		acpi_gbl_copy_dsdt_locally = 1;
	}
	/* "acpi=nocmcff" disables FF mode for corrected errors */
	else if (strcmp(arg, "nocmcff") == 0) {
		acpi_disable_cmcff = 1;
	} else {
		/* Core will printk when we return error. */
		return -EINVAL;
	}
	return 0;
}
early_param("acpi", parse_acpi);

/* FIXME: Using pci= for an ACPI parameter is a travesty. */
static int __init parse_pci(char *arg)
{
	if (arg && strcmp(arg, "noacpi") == 0)
		acpi_disable_pci();
	return 0;
}
early_param("pci", parse_pci);

int __init acpi_mps_check(void)
{
#if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
/* mptable code is not built-in*/
	if (acpi_disabled || acpi_noirq) {
		printk(KERN_WARNING "MPS support code is not built-in.\n"
		       "Using acpi=off or acpi=noirq or pci=noacpi "
		       "may have problem\n");
		return 1;
	}
#endif
	return 0;
}

#ifdef CONFIG_X86_IO_APIC
static int __init parse_acpi_skip_timer_override(char *arg)
{
	acpi_skip_timer_override = 1;
	return 0;
}
early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);

static int __init parse_acpi_use_timer_override(char *arg)
{
	acpi_use_timer_override = 1;
	return 0;
}
early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
#endif /* CONFIG_X86_IO_APIC */

static int __init setup_acpi_sci(char *s)
{
	if (!s)
		return -EINVAL;
	if (!strcmp(s, "edge"))
		acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
	else if (!strcmp(s, "level"))
		acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
	else if (!strcmp(s, "high"))
		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
	else if (!strcmp(s, "low"))
		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
	else
		return -EINVAL;
	return 0;
}
early_param("acpi_sci", setup_acpi_sci);

int __acpi_acquire_global_lock(unsigned int *lock)
{
	unsigned int old, new, val;
	do {
		old = *lock;
		new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
		val = cmpxchg(lock, old, new);
	} while (unlikely (val != old));
	return (new < 3) ? -1 : 0;
}

int __acpi_release_global_lock(unsigned int *lock)
{
	unsigned int old, new, val;
	do {
		old = *lock;
		new = old & ~0x3;
		val = cmpxchg(lock, old, new);
	} while (unlikely (val != old));
	return old & 0x1;
}

void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
{
	e820__range_add(addr, size, E820_TYPE_ACPI);
	e820__update_table_print();
}

u64 x86_default_get_root_pointer(void)
{
	return boot_params.acpi_rsdp_addr;
}