Free Electrons

Embedded Linux Experts

  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
/*
 *  acpi.c - Architecture-Specific Low-Level ACPI Support
 *
 *  Copyright (C) 1999 VA Linux Systems
 *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
 *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *  Copyright (C) 2000 Intel Corp.
 *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
 *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
 *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
 *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
 *  Copyright (C) 2004 Ashok Raj <ashok.raj@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/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/mmzone.h>
#include <linux/nodemask.h>
#include <linux/slab.h>
#include <acpi/processor.h>
#include <asm/io.h>
#include <asm/iosapic.h>
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/numa.h>
#include <asm/sal.h>
#include <asm/cyclone.h>

#define PREFIX			"ACPI: "

int acpi_lapic;
unsigned int acpi_cpei_override;
unsigned int acpi_cpei_phys_cpuid;

unsigned long acpi_wakeup_address = 0;

#ifdef CONFIG_IA64_GENERIC
static unsigned long __init acpi_find_rsdp(void)
{
	unsigned long rsdp_phys = 0;

	if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
		rsdp_phys = efi.acpi20;
	else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
		printk(KERN_WARNING PREFIX
		       "v1.0/r0.71 tables no longer supported\n");
	return rsdp_phys;
}

const char __init *
acpi_get_sysname(void)
{
	unsigned long rsdp_phys;
	struct acpi_table_rsdp *rsdp;
	struct acpi_table_xsdt *xsdt;
	struct acpi_table_header *hdr;
#ifdef CONFIG_INTEL_IOMMU
	u64 i, nentries;
#endif

	rsdp_phys = acpi_find_rsdp();
	if (!rsdp_phys) {
		printk(KERN_ERR
		       "ACPI 2.0 RSDP not found, default to \"dig\"\n");
		return "dig";
	}

	rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
	if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
		printk(KERN_ERR
		       "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
		return "dig";
	}

	xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
	hdr = &xsdt->header;
	if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
		printk(KERN_ERR
		       "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
		return "dig";
	}

	if (!strcmp(hdr->oem_id, "HP")) {
		return "hpzx1";
	} else if (!strcmp(hdr->oem_id, "SGI")) {
		if (!strcmp(hdr->oem_table_id + 4, "UV"))
			return "uv";
		else
			return "sn2";
	}

#ifdef CONFIG_INTEL_IOMMU
	/* Look for Intel IOMMU */
	nentries = (hdr->length - sizeof(*hdr)) /
			 sizeof(xsdt->table_offset_entry[0]);
	for (i = 0; i < nentries; i++) {
		hdr = __va(xsdt->table_offset_entry[i]);
		if (strncmp(hdr->signature, ACPI_SIG_DMAR,
			sizeof(ACPI_SIG_DMAR) - 1) == 0)
			return "dig_vtd";
	}
#endif

	return "dig";
}
#endif /* CONFIG_IA64_GENERIC */

#define ACPI_MAX_PLATFORM_INTERRUPTS	256

/* Array to record platform interrupt vectors for generic interrupt routing. */
int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
	[0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
};

enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;

/*
 * Interrupt routing API for device drivers.  Provides interrupt vector for
 * a generic platform event.  Currently only CPEI is implemented.
 */
int acpi_request_vector(u32 int_type)
{
	int vector = -1;

	if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
		/* corrected platform error interrupt */
		vector = platform_intr_list[int_type];
	} else
		printk(KERN_ERR
		       "acpi_request_vector(): invalid interrupt type\n");
	return vector;
}

char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
{
	return __va(phys_addr);
}

void __init __acpi_unmap_table(char *map, unsigned long size)
{
}

/* --------------------------------------------------------------------------
                            Boot-time Table Parsing
   -------------------------------------------------------------------------- */

static int available_cpus __initdata;
struct acpi_table_madt *acpi_madt __initdata;
static u8 has_8259;

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

	lapic = (struct acpi_madt_local_apic_override *)header;

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

	if (lapic->address) {
		iounmap(ipi_base_addr);
		ipi_base_addr = ioremap(lapic->address, 0);
	}
	return 0;
}

static int __init
acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
{
	struct acpi_madt_local_sapic *lsapic;

	lsapic = (struct acpi_madt_local_sapic *)header;

	/*Skip BAD_MADT_ENTRY check, as lsapic size could vary */

	if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
#ifdef CONFIG_SMP
		smp_boot_data.cpu_phys_id[available_cpus] =
		    (lsapic->id << 8) | lsapic->eid;
#endif
		++available_cpus;
	}

	total_cpus++;
	return 0;
}

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

	lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;

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

	/* TBD: Support lapic_nmi entries */
	return 0;
}

static int __init
acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
{
	struct acpi_madt_io_sapic *iosapic;

	iosapic = (struct acpi_madt_io_sapic *)header;

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

	return iosapic_init(iosapic->address, iosapic->global_irq_base);
}

static unsigned int __initdata acpi_madt_rev;

static int __init
acpi_parse_plat_int_src(struct acpi_subtable_header * header,
			const unsigned long end)
{
	struct acpi_madt_interrupt_source *plintsrc;
	int vector;

	plintsrc = (struct acpi_madt_interrupt_source *)header;

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

	/*
	 * Get vector assignment for this interrupt, set attributes,
	 * and program the IOSAPIC routing table.
	 */
	vector = iosapic_register_platform_intr(plintsrc->type,
						plintsrc->global_irq,
						plintsrc->io_sapic_vector,
						plintsrc->eid,
						plintsrc->id,
						((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
						 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
						IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
						((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
						 ACPI_MADT_TRIGGER_EDGE) ?
						IOSAPIC_EDGE : IOSAPIC_LEVEL);

	platform_intr_list[plintsrc->type] = vector;
	if (acpi_madt_rev > 1) {
		acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
	}

	/*
	 * Save the physical id, so we can check when its being removed
	 */
	acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;

	return 0;
}

#ifdef CONFIG_HOTPLUG_CPU
unsigned int can_cpei_retarget(void)
{
	extern int cpe_vector;
	extern unsigned int force_cpei_retarget;

	/*
	 * Only if CPEI is supported and the override flag
	 * is present, otherwise return that its re-targettable
	 * if we are in polling mode.
	 */
	if (cpe_vector > 0) {
		if (acpi_cpei_override || force_cpei_retarget)
			return 1;
		else
			return 0;
	}
	return 1;
}

unsigned int is_cpu_cpei_target(unsigned int cpu)
{
	unsigned int logical_id;

	logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);

	if (logical_id == cpu)
		return 1;
	else
		return 0;
}

void set_cpei_target_cpu(unsigned int cpu)
{
	acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
}
#endif

unsigned int get_cpei_target_cpu(void)
{
	return acpi_cpei_phys_cpuid;
}

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

	p = (struct acpi_madt_interrupt_override *)header;

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

	iosapic_override_isa_irq(p->source_irq, p->global_irq,
				 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
				  ACPI_MADT_POLARITY_ACTIVE_LOW) ?
				 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
				 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
				 ACPI_MADT_TRIGGER_LEVEL) ?
				 IOSAPIC_LEVEL : IOSAPIC_EDGE);
	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;

	nmi_src = (struct acpi_madt_nmi_source *)header;

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

	/* TBD: Support nimsrc entries */
	return 0;
}

static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
	if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {

		/*
		 * Unfortunately ITC_DRIFT is not yet part of the
		 * official SAL spec, so the ITC_DRIFT bit is not
		 * set by the BIOS on this hardware.
		 */
		sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;

		cyclone_setup();
	}
}

static int __init acpi_parse_madt(struct acpi_table_header *table)
{
	acpi_madt = (struct acpi_table_madt *)table;

	acpi_madt_rev = acpi_madt->header.revision;

	/* remember the value for reference after free_initmem() */
#ifdef CONFIG_ITANIUM
	has_8259 = 1;		/* Firmware on old Itanium systems is broken */
#else
	has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
#endif
	iosapic_system_init(has_8259);

	/* Get base address of IPI Message Block */

	if (acpi_madt->address)
		ipi_base_addr = ioremap(acpi_madt->address, 0);

	printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);

	acpi_madt_oem_check(acpi_madt->header.oem_id,
			    acpi_madt->header.oem_table_id);

	return 0;
}

#ifdef CONFIG_ACPI_NUMA

#undef SLIT_DEBUG

#define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)

static int __initdata srat_num_cpus;	/* number of cpus */
static u32 pxm_flag[PXM_FLAG_LEN];
#define pxm_bit_set(bit)	(set_bit(bit,(void *)pxm_flag))
#define pxm_bit_test(bit)	(test_bit(bit,(void *)pxm_flag))
static struct acpi_table_slit __initdata *slit_table;
cpumask_t early_cpu_possible_map = CPU_MASK_NONE;

static int __init
get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
{
	int pxm;

	pxm = pa->proximity_domain_lo;
	if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
		pxm += pa->proximity_domain_hi[0] << 8;
	return pxm;
}

static int __init
get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
{
	int pxm;

	pxm = ma->proximity_domain;
	if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
		pxm &= 0xff;

	return pxm;
}

/*
 * ACPI 2.0 SLIT (System Locality Information Table)
 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 */
void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
{
	u32 len;

	len = sizeof(struct acpi_table_header) + 8
	    + slit->locality_count * slit->locality_count;
	if (slit->header.length != len) {
		printk(KERN_ERR
		       "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
		       len, slit->header.length);
		return;
	}
	slit_table = slit;
}

void __init
acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
{
	int pxm;

	if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
		return;

	if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
		printk_once(KERN_WARNING
			    "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
			    ARRAY_SIZE(node_cpuid));
		return;
	}
	pxm = get_processor_proximity_domain(pa);

	/* record this node in proximity bitmap */
	pxm_bit_set(pxm);

	node_cpuid[srat_num_cpus].phys_id =
	    (pa->apic_id << 8) | (pa->local_sapic_eid);
	/* nid should be overridden as logical node id later */
	node_cpuid[srat_num_cpus].nid = pxm;
	cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
	srat_num_cpus++;
}

int __init
acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
{
	unsigned long paddr, size;
	int pxm;
	struct node_memblk_s *p, *q, *pend;

	pxm = get_memory_proximity_domain(ma);

	/* fill node memory chunk structure */
	paddr = ma->base_address;
	size = ma->length;

	/* Ignore disabled entries */
	if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
		return -1;

	/* record this node in proximity bitmap */
	pxm_bit_set(pxm);

	/* Insertion sort based on base address */
	pend = &node_memblk[num_node_memblks];
	for (p = &node_memblk[0]; p < pend; p++) {
		if (paddr < p->start_paddr)
			break;
	}
	if (p < pend) {
		for (q = pend - 1; q >= p; q--)
			*(q + 1) = *q;
	}
	p->start_paddr = paddr;
	p->size = size;
	p->nid = pxm;
	num_node_memblks++;
	return 0;
}

void __init acpi_numa_fixup(void)
{
	int i, j, node_from, node_to;

	/* If there's no SRAT, fix the phys_id and mark node 0 online */
	if (srat_num_cpus == 0) {
		node_set_online(0);
		node_cpuid[0].phys_id = hard_smp_processor_id();
		return;
	}

	/*
	 * MCD - This can probably be dropped now.  No need for pxm ID to node ID
	 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
	 */
	nodes_clear(node_online_map);
	for (i = 0; i < MAX_PXM_DOMAINS; i++) {
		if (pxm_bit_test(i)) {
			int nid = acpi_map_pxm_to_node(i);
			node_set_online(nid);
		}
	}

	/* set logical node id in memory chunk structure */
	for (i = 0; i < num_node_memblks; i++)
		node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);

	/* assign memory bank numbers for each chunk on each node */
	for_each_online_node(i) {
		int bank;

		bank = 0;
		for (j = 0; j < num_node_memblks; j++)
			if (node_memblk[j].nid == i)
				node_memblk[j].bank = bank++;
	}

	/* set logical node id in cpu structure */
	for_each_possible_early_cpu(i)
		node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);

	printk(KERN_INFO "Number of logical nodes in system = %d\n",
	       num_online_nodes());
	printk(KERN_INFO "Number of memory chunks in system = %d\n",
	       num_node_memblks);

	if (!slit_table) {
		for (i = 0; i < MAX_NUMNODES; i++)
			for (j = 0; j < MAX_NUMNODES; j++)
				node_distance(i, j) = i == j ? LOCAL_DISTANCE :
							REMOTE_DISTANCE;
		return;
	}

	memset(numa_slit, -1, sizeof(numa_slit));
	for (i = 0; i < slit_table->locality_count; i++) {
		if (!pxm_bit_test(i))
			continue;
		node_from = pxm_to_node(i);
		for (j = 0; j < slit_table->locality_count; j++) {
			if (!pxm_bit_test(j))
				continue;
			node_to = pxm_to_node(j);
			node_distance(node_from, node_to) =
			    slit_table->entry[i * slit_table->locality_count + j];
		}
	}

#ifdef SLIT_DEBUG
	printk("ACPI 2.0 SLIT locality table:\n");
	for_each_online_node(i) {
		for_each_online_node(j)
		    printk("%03d ", node_distance(i, j));
		printk("\n");
	}
#endif
}
#endif				/* CONFIG_ACPI_NUMA */

/*
 * success: return IRQ number (>=0)
 * failure: return < 0
 */
int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
{
	if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
		return gsi;

	if (has_8259 && gsi < 16)
		return isa_irq_to_vector(gsi);

	return iosapic_register_intr(gsi,
				     (polarity ==
				      ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
				     IOSAPIC_POL_LOW,
				     (triggering ==
				      ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
				     IOSAPIC_LEVEL);
}
EXPORT_SYMBOL_GPL(acpi_register_gsi);

void acpi_unregister_gsi(u32 gsi)
{
	if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
		return;

	if (has_8259 && gsi < 16)
		return;

	iosapic_unregister_intr(gsi);
}
EXPORT_SYMBOL_GPL(acpi_unregister_gsi);

static int __init acpi_parse_fadt(struct acpi_table_header *table)
{
	struct acpi_table_header *fadt_header;
	struct acpi_table_fadt *fadt;

	fadt_header = (struct acpi_table_header *)table;
	if (fadt_header->revision != 3)
		return -ENODEV;	/* Only deal with ACPI 2.0 FADT */

	fadt = (struct acpi_table_fadt *)fadt_header;

	acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
				 ACPI_ACTIVE_LOW);
	return 0;
}

int __init early_acpi_boot_init(void)
{
	int ret;

	/*
	 * do a partial walk of MADT to determine how many CPUs
	 * we have including offline CPUs
	 */
	if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
		printk(KERN_ERR PREFIX "Can't find MADT\n");
		return 0;
	}

	ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
		acpi_parse_lsapic, NR_CPUS);
	if (ret < 1)
		printk(KERN_ERR PREFIX
		       "Error parsing MADT - no LAPIC entries\n");
	else
		acpi_lapic = 1;

#ifdef CONFIG_SMP
	if (available_cpus == 0) {
		printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
		printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
		smp_boot_data.cpu_phys_id[available_cpus] =
		    hard_smp_processor_id();
		available_cpus = 1;	/* We've got at least one of these, no? */
	}
	smp_boot_data.cpu_count = available_cpus;
#endif
	/* Make boot-up look pretty */
	printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
	       total_cpus);

	return 0;
}

int __init acpi_boot_init(void)
{

	/*
	 * MADT
	 * ----
	 * Parse the Multiple APIC Description Table (MADT), if exists.
	 * Note that this table provides platform SMP configuration
	 * information -- the successor to MPS tables.
	 */

	if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
		printk(KERN_ERR PREFIX "Can't find MADT\n");
		goto skip_madt;
	}

	/* Local APIC */

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

	if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
	    < 0)
		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");

	/* I/O APIC */

	if (acpi_table_parse_madt
	    (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
		if (!ia64_platform_is("sn2"))
			printk(KERN_ERR PREFIX
			       "Error parsing MADT - no IOSAPIC entries\n");
	}

	/* System-Level Interrupt Routing */

	if (acpi_table_parse_madt
	    (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
	     ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
		printk(KERN_ERR PREFIX
		       "Error parsing platform interrupt source entry\n");

	if (acpi_table_parse_madt
	    (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
		printk(KERN_ERR PREFIX
		       "Error parsing interrupt source overrides entry\n");

	if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
      skip_madt:

	/*
	 * FADT says whether a legacy keyboard controller is present.
	 * The FADT also contains an SCI_INT line, by which the system
	 * gets interrupts such as power and sleep buttons.  If it's not
	 * on a Legacy interrupt, it needs to be setup.
	 */
	if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
		printk(KERN_ERR PREFIX "Can't find FADT\n");

#ifdef CONFIG_ACPI_NUMA
#ifdef CONFIG_SMP
	if (srat_num_cpus == 0) {
		int cpu, i = 1;
		for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
			if (smp_boot_data.cpu_phys_id[cpu] !=
			    hard_smp_processor_id())
				node_cpuid[i++].phys_id =
				    smp_boot_data.cpu_phys_id[cpu];
	}
#endif
	build_cpu_to_node_map();
#endif
	return 0;
}

int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
	int tmp;

	if (has_8259 && gsi < 16)
		*irq = isa_irq_to_vector(gsi);
	else {
		tmp = gsi_to_irq(gsi);
		if (tmp == -1)
			return -1;
		*irq = tmp;
	}
	return 0;
}

int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
{
	if (isa_irq >= 16)
		return -1;
	*gsi = isa_irq;
	return 0;
}

/*
 *  ACPI based hotplug CPU support
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
{
#ifdef CONFIG_ACPI_NUMA
	/*
	 * We don't have cpu-only-node hotadd. But if the system equips
	 * SRAT table, pxm is already found and node is ready.
  	 * So, just pxm_to_nid(pxm) is OK.
	 * This code here is for the system which doesn't have full SRAT
  	 * table for possible cpus.
	 */
	node_cpuid[cpu].phys_id = physid;
	node_cpuid[cpu].nid = acpi_get_node(handle);
#endif
	return 0;
}

int additional_cpus __initdata = -1;

static __init int setup_additional_cpus(char *s)
{
	if (s)
		additional_cpus = simple_strtol(s, NULL, 0);

	return 0;
}

early_param("additional_cpus", setup_additional_cpus);

/*
 * cpu_possible_mask should be static, it cannot change as CPUs
 * are onlined, or offlined. The reason is per-cpu data-structures
 * are allocated by some modules at init time, and dont expect to
 * do this dynamically on cpu arrival/departure.
 * cpu_present_mask on the other hand can change dynamically.
 * In case when cpu_hotplug is not compiled, then we resort to current
 * behaviour, which is cpu_possible == cpu_present.
 * - Ashok Raj
 *
 * Three ways to find out the number of additional hotplug CPUs:
 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 * - The user can overwrite it with additional_cpus=NUM
 * - Otherwise don't reserve additional CPUs.
 */
__init void prefill_possible_map(void)
{
	int i;
	int possible, disabled_cpus;

	disabled_cpus = total_cpus - available_cpus;

 	if (additional_cpus == -1) {
 		if (disabled_cpus > 0)
			additional_cpus = disabled_cpus;
 		else
			additional_cpus = 0;
 	}

	possible = available_cpus + additional_cpus;

	if (possible > nr_cpu_ids)
		possible = nr_cpu_ids;

	printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
		possible, max((possible - available_cpus), 0));

	for (i = 0; i < possible; i++)
		set_cpu_possible(i, true);
}

static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
{
	cpumask_t tmp_map;
	int cpu;

	cpumask_complement(&tmp_map, cpu_present_mask);
	cpu = cpumask_first(&tmp_map);
	if (cpu >= nr_cpu_ids)
		return -EINVAL;

	acpi_map_cpu2node(handle, cpu, physid);

	set_cpu_present(cpu, true);
	ia64_cpu_to_sapicid[cpu] = physid;

	acpi_processor_set_pdc(handle);

	*pcpu = cpu;
	return (0);
}

/* wrapper to silence section mismatch warning */
int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
		       int *pcpu)
{
	return _acpi_map_lsapic(handle, physid, pcpu);
}
EXPORT_SYMBOL(acpi_map_cpu);

int acpi_unmap_cpu(int cpu)
{
	ia64_cpu_to_sapicid[cpu] = -1;
	set_cpu_present(cpu, false);

#ifdef CONFIG_ACPI_NUMA
	/* NUMA specific cleanup's */
#endif

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

#ifdef CONFIG_ACPI_NUMA
static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
				    void *context, void **ret)
{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
	struct acpi_madt_io_sapic *iosapic;
	unsigned int gsi_base;
	int node;

	/* Only care about objects w/ a method that returns the MADT */
	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
		return AE_OK;

	if (!buffer.length || !buffer.pointer)
		return AE_OK;

	obj = buffer.pointer;
	if (obj->type != ACPI_TYPE_BUFFER ||
	    obj->buffer.length < sizeof(*iosapic)) {
		kfree(buffer.pointer);
		return AE_OK;
	}

	iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;

	if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
		kfree(buffer.pointer);
		return AE_OK;
	}

	gsi_base = iosapic->global_irq_base;

	kfree(buffer.pointer);

	/* OK, it's an IOSAPIC MADT entry; associate it with a node */
	node = acpi_get_node(handle);
	if (node == NUMA_NO_NODE || !node_online(node) ||
	    cpumask_empty(cpumask_of_node(node)))
		return AE_OK;

	/* We know a gsi to node mapping! */
	map_iosapic_to_node(gsi_base, node);
	return AE_OK;
}

static int __init
acpi_map_iosapics (void)
{
	acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
	return 0;
}

fs_initcall(acpi_map_iosapics);
#endif				/* CONFIG_ACPI_NUMA */

int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
{
	int err;

	if ((err = iosapic_init(phys_addr, gsi_base)))
		return err;

#ifdef CONFIG_ACPI_NUMA
	acpi_map_iosapic(handle, 0, NULL, NULL);
#endif				/* CONFIG_ACPI_NUMA */

	return 0;
}

EXPORT_SYMBOL(acpi_register_ioapic);

int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
{
	return iosapic_remove(gsi_base);
}

EXPORT_SYMBOL(acpi_unregister_ioapic);

/*
 * acpi_suspend_lowlevel() - save kernel state and suspend.
 *
 * TBD when when IA64 starts to support suspend...
 */
int acpi_suspend_lowlevel(void) { return 0; }