GNU Linux-libre 4.4.292-gnu1
[releases.git] / arch / ia64 / kernel / acpi.c
1 /*
2  *  acpi.c - Architecture-Specific Low-Level ACPI Support
3  *
4  *  Copyright (C) 1999 VA Linux Systems
5  *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
6  *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
7  *      David Mosberger-Tang <davidm@hpl.hp.com>
8  *  Copyright (C) 2000 Intel Corp.
9  *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
10  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
11  *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
12  *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
13  *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
14  *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
15  *
16  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
17  *
18  *  This program is free software; you can redistribute it and/or modify
19  *  it under the terms of the GNU General Public License as published by
20  *  the Free Software Foundation; either version 2 of the License, or
21  *  (at your option) any later version.
22  *
23  *  This program is distributed in the hope that it will be useful,
24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
26  *  GNU General Public License for more details.
27  *
28  *  You should have received a copy of the GNU General Public License
29  *  along with this program; if not, write to the Free Software
30  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31  *
32  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
33  */
34
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/sched.h>
39 #include <linux/smp.h>
40 #include <linux/string.h>
41 #include <linux/types.h>
42 #include <linux/irq.h>
43 #include <linux/acpi.h>
44 #include <linux/efi.h>
45 #include <linux/mmzone.h>
46 #include <linux/nodemask.h>
47 #include <linux/slab.h>
48 #include <acpi/processor.h>
49 #include <asm/io.h>
50 #include <asm/iosapic.h>
51 #include <asm/machvec.h>
52 #include <asm/page.h>
53 #include <asm/numa.h>
54 #include <asm/sal.h>
55 #include <asm/cyclone.h>
56
57 #define PREFIX                  "ACPI: "
58
59 int acpi_lapic;
60 unsigned int acpi_cpei_override;
61 unsigned int acpi_cpei_phys_cpuid;
62
63 unsigned long acpi_wakeup_address = 0;
64
65 #ifdef CONFIG_IA64_GENERIC
66 static unsigned long __init acpi_find_rsdp(void)
67 {
68         unsigned long rsdp_phys = 0;
69
70         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
71                 rsdp_phys = efi.acpi20;
72         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
73                 printk(KERN_WARNING PREFIX
74                        "v1.0/r0.71 tables no longer supported\n");
75         return rsdp_phys;
76 }
77
78 const char __init *
79 acpi_get_sysname(void)
80 {
81         unsigned long rsdp_phys;
82         struct acpi_table_rsdp *rsdp;
83         struct acpi_table_xsdt *xsdt;
84         struct acpi_table_header *hdr;
85 #ifdef CONFIG_INTEL_IOMMU
86         u64 i, nentries;
87 #endif
88
89         rsdp_phys = acpi_find_rsdp();
90         if (!rsdp_phys) {
91                 printk(KERN_ERR
92                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
93                 return "dig";
94         }
95
96         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
97         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
98                 printk(KERN_ERR
99                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
100                 return "dig";
101         }
102
103         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
104         hdr = &xsdt->header;
105         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
106                 printk(KERN_ERR
107                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
108                 return "dig";
109         }
110
111         if (!strcmp(hdr->oem_id, "HP")) {
112                 return "hpzx1";
113         } else if (!strcmp(hdr->oem_id, "SGI")) {
114                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
115                         return "uv";
116                 else
117                         return "sn2";
118         }
119
120 #ifdef CONFIG_INTEL_IOMMU
121         /* Look for Intel IOMMU */
122         nentries = (hdr->length - sizeof(*hdr)) /
123                          sizeof(xsdt->table_offset_entry[0]);
124         for (i = 0; i < nentries; i++) {
125                 hdr = __va(xsdt->table_offset_entry[i]);
126                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
127                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
128                         return "dig_vtd";
129         }
130 #endif
131
132         return "dig";
133 }
134 #endif /* CONFIG_IA64_GENERIC */
135
136 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
137
138 /* Array to record platform interrupt vectors for generic interrupt routing. */
139 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
140         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
141 };
142
143 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
144
145 /*
146  * Interrupt routing API for device drivers.  Provides interrupt vector for
147  * a generic platform event.  Currently only CPEI is implemented.
148  */
149 int acpi_request_vector(u32 int_type)
150 {
151         int vector = -1;
152
153         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
154                 /* corrected platform error interrupt */
155                 vector = platform_intr_list[int_type];
156         } else
157                 printk(KERN_ERR
158                        "acpi_request_vector(): invalid interrupt type\n");
159         return vector;
160 }
161
162 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
163 {
164         return __va(phys_addr);
165 }
166
167 void __init __acpi_unmap_table(char *map, unsigned long size)
168 {
169 }
170
171 /* --------------------------------------------------------------------------
172                             Boot-time Table Parsing
173    -------------------------------------------------------------------------- */
174
175 static int available_cpus __initdata;
176 struct acpi_table_madt *acpi_madt __initdata;
177 static u8 has_8259;
178
179 static int __init
180 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
181                           const unsigned long end)
182 {
183         struct acpi_madt_local_apic_override *lapic;
184
185         lapic = (struct acpi_madt_local_apic_override *)header;
186
187         if (BAD_MADT_ENTRY(lapic, end))
188                 return -EINVAL;
189
190         if (lapic->address) {
191                 iounmap(ipi_base_addr);
192                 ipi_base_addr = ioremap(lapic->address, 0);
193         }
194         return 0;
195 }
196
197 static int __init
198 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
199 {
200         struct acpi_madt_local_sapic *lsapic;
201
202         lsapic = (struct acpi_madt_local_sapic *)header;
203
204         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
205
206         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
207 #ifdef CONFIG_SMP
208                 smp_boot_data.cpu_phys_id[available_cpus] =
209                     (lsapic->id << 8) | lsapic->eid;
210 #endif
211                 ++available_cpus;
212         }
213
214         total_cpus++;
215         return 0;
216 }
217
218 static int __init
219 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
220 {
221         struct acpi_madt_local_apic_nmi *lacpi_nmi;
222
223         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
224
225         if (BAD_MADT_ENTRY(lacpi_nmi, end))
226                 return -EINVAL;
227
228         /* TBD: Support lapic_nmi entries */
229         return 0;
230 }
231
232 static int __init
233 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
234 {
235         struct acpi_madt_io_sapic *iosapic;
236
237         iosapic = (struct acpi_madt_io_sapic *)header;
238
239         if (BAD_MADT_ENTRY(iosapic, end))
240                 return -EINVAL;
241
242         return iosapic_init(iosapic->address, iosapic->global_irq_base);
243 }
244
245 static unsigned int __initdata acpi_madt_rev;
246
247 static int __init
248 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
249                         const unsigned long end)
250 {
251         struct acpi_madt_interrupt_source *plintsrc;
252         int vector;
253
254         plintsrc = (struct acpi_madt_interrupt_source *)header;
255
256         if (BAD_MADT_ENTRY(plintsrc, end))
257                 return -EINVAL;
258
259         /*
260          * Get vector assignment for this interrupt, set attributes,
261          * and program the IOSAPIC routing table.
262          */
263         vector = iosapic_register_platform_intr(plintsrc->type,
264                                                 plintsrc->global_irq,
265                                                 plintsrc->io_sapic_vector,
266                                                 plintsrc->eid,
267                                                 plintsrc->id,
268                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
269                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
270                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
271                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
272                                                  ACPI_MADT_TRIGGER_EDGE) ?
273                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
274
275         platform_intr_list[plintsrc->type] = vector;
276         if (acpi_madt_rev > 1) {
277                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
278         }
279
280         /*
281          * Save the physical id, so we can check when its being removed
282          */
283         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
284
285         return 0;
286 }
287
288 #ifdef CONFIG_HOTPLUG_CPU
289 unsigned int can_cpei_retarget(void)
290 {
291         extern int cpe_vector;
292         extern unsigned int force_cpei_retarget;
293
294         /*
295          * Only if CPEI is supported and the override flag
296          * is present, otherwise return that its re-targettable
297          * if we are in polling mode.
298          */
299         if (cpe_vector > 0) {
300                 if (acpi_cpei_override || force_cpei_retarget)
301                         return 1;
302                 else
303                         return 0;
304         }
305         return 1;
306 }
307
308 unsigned int is_cpu_cpei_target(unsigned int cpu)
309 {
310         unsigned int logical_id;
311
312         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
313
314         if (logical_id == cpu)
315                 return 1;
316         else
317                 return 0;
318 }
319
320 void set_cpei_target_cpu(unsigned int cpu)
321 {
322         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
323 }
324 #endif
325
326 unsigned int get_cpei_target_cpu(void)
327 {
328         return acpi_cpei_phys_cpuid;
329 }
330
331 static int __init
332 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
333                        const unsigned long end)
334 {
335         struct acpi_madt_interrupt_override *p;
336
337         p = (struct acpi_madt_interrupt_override *)header;
338
339         if (BAD_MADT_ENTRY(p, end))
340                 return -EINVAL;
341
342         iosapic_override_isa_irq(p->source_irq, p->global_irq,
343                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
344                                   ACPI_MADT_POLARITY_ACTIVE_LOW) ?
345                                  IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
346                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
347                                  ACPI_MADT_TRIGGER_LEVEL) ?
348                                  IOSAPIC_LEVEL : IOSAPIC_EDGE);
349         return 0;
350 }
351
352 static int __init
353 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
354 {
355         struct acpi_madt_nmi_source *nmi_src;
356
357         nmi_src = (struct acpi_madt_nmi_source *)header;
358
359         if (BAD_MADT_ENTRY(nmi_src, end))
360                 return -EINVAL;
361
362         /* TBD: Support nimsrc entries */
363         return 0;
364 }
365
366 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
367 {
368         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
369
370                 /*
371                  * Unfortunately ITC_DRIFT is not yet part of the
372                  * official SAL spec, so the ITC_DRIFT bit is not
373                  * set by the BIOS on this hardware.
374                  */
375                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
376
377                 cyclone_setup();
378         }
379 }
380
381 static int __init acpi_parse_madt(struct acpi_table_header *table)
382 {
383         acpi_madt = (struct acpi_table_madt *)table;
384
385         acpi_madt_rev = acpi_madt->header.revision;
386
387         /* remember the value for reference after free_initmem() */
388 #ifdef CONFIG_ITANIUM
389         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
390 #else
391         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
392 #endif
393         iosapic_system_init(has_8259);
394
395         /* Get base address of IPI Message Block */
396
397         if (acpi_madt->address)
398                 ipi_base_addr = ioremap(acpi_madt->address, 0);
399
400         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
401
402         acpi_madt_oem_check(acpi_madt->header.oem_id,
403                             acpi_madt->header.oem_table_id);
404
405         return 0;
406 }
407
408 #ifdef CONFIG_ACPI_NUMA
409
410 #undef SLIT_DEBUG
411
412 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
413
414 static int __initdata srat_num_cpus;    /* number of cpus */
415 static u32 pxm_flag[PXM_FLAG_LEN];
416 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
417 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
418 static struct acpi_table_slit __initdata *slit_table;
419 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
420
421 static int __init
422 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
423 {
424         int pxm;
425
426         pxm = pa->proximity_domain_lo;
427         if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
428                 pxm += pa->proximity_domain_hi[0] << 8;
429         return pxm;
430 }
431
432 static int __init
433 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
434 {
435         int pxm;
436
437         pxm = ma->proximity_domain;
438         if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
439                 pxm &= 0xff;
440
441         return pxm;
442 }
443
444 /*
445  * ACPI 2.0 SLIT (System Locality Information Table)
446  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
447  */
448 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
449 {
450         u32 len;
451
452         len = sizeof(struct acpi_table_header) + 8
453             + slit->locality_count * slit->locality_count;
454         if (slit->header.length != len) {
455                 printk(KERN_ERR
456                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
457                        len, slit->header.length);
458                 return;
459         }
460         slit_table = slit;
461 }
462
463 void __init
464 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
465 {
466         int pxm;
467
468         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
469                 return;
470
471         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
472                 printk_once(KERN_WARNING
473                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
474                             ARRAY_SIZE(node_cpuid));
475                 return;
476         }
477         pxm = get_processor_proximity_domain(pa);
478
479         /* record this node in proximity bitmap */
480         pxm_bit_set(pxm);
481
482         node_cpuid[srat_num_cpus].phys_id =
483             (pa->apic_id << 8) | (pa->local_sapic_eid);
484         /* nid should be overridden as logical node id later */
485         node_cpuid[srat_num_cpus].nid = pxm;
486         cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
487         srat_num_cpus++;
488 }
489
490 int __init
491 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
492 {
493         unsigned long paddr, size;
494         int pxm;
495         struct node_memblk_s *p, *q, *pend;
496
497         pxm = get_memory_proximity_domain(ma);
498
499         /* fill node memory chunk structure */
500         paddr = ma->base_address;
501         size = ma->length;
502
503         /* Ignore disabled entries */
504         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
505                 return -1;
506
507         /* record this node in proximity bitmap */
508         pxm_bit_set(pxm);
509
510         /* Insertion sort based on base address */
511         pend = &node_memblk[num_node_memblks];
512         for (p = &node_memblk[0]; p < pend; p++) {
513                 if (paddr < p->start_paddr)
514                         break;
515         }
516         if (p < pend) {
517                 for (q = pend - 1; q >= p; q--)
518                         *(q + 1) = *q;
519         }
520         p->start_paddr = paddr;
521         p->size = size;
522         p->nid = pxm;
523         num_node_memblks++;
524         return 0;
525 }
526
527 void __init acpi_numa_arch_fixup(void)
528 {
529         int i, j, node_from, node_to;
530
531         /* If there's no SRAT, fix the phys_id and mark node 0 online */
532         if (srat_num_cpus == 0) {
533                 node_set_online(0);
534                 node_cpuid[0].phys_id = hard_smp_processor_id();
535                 return;
536         }
537
538         /*
539          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
540          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
541          */
542         nodes_clear(node_online_map);
543         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
544                 if (pxm_bit_test(i)) {
545                         int nid = acpi_map_pxm_to_node(i);
546                         node_set_online(nid);
547                 }
548         }
549
550         /* set logical node id in memory chunk structure */
551         for (i = 0; i < num_node_memblks; i++)
552                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
553
554         /* assign memory bank numbers for each chunk on each node */
555         for_each_online_node(i) {
556                 int bank;
557
558                 bank = 0;
559                 for (j = 0; j < num_node_memblks; j++)
560                         if (node_memblk[j].nid == i)
561                                 node_memblk[j].bank = bank++;
562         }
563
564         /* set logical node id in cpu structure */
565         for_each_possible_early_cpu(i)
566                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
567
568         printk(KERN_INFO "Number of logical nodes in system = %d\n",
569                num_online_nodes());
570         printk(KERN_INFO "Number of memory chunks in system = %d\n",
571                num_node_memblks);
572
573         if (!slit_table) {
574                 for (i = 0; i < MAX_NUMNODES; i++)
575                         for (j = 0; j < MAX_NUMNODES; j++)
576                                 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
577                                                         REMOTE_DISTANCE;
578                 return;
579         }
580
581         memset(numa_slit, -1, sizeof(numa_slit));
582         for (i = 0; i < slit_table->locality_count; i++) {
583                 if (!pxm_bit_test(i))
584                         continue;
585                 node_from = pxm_to_node(i);
586                 for (j = 0; j < slit_table->locality_count; j++) {
587                         if (!pxm_bit_test(j))
588                                 continue;
589                         node_to = pxm_to_node(j);
590                         node_distance(node_from, node_to) =
591                             slit_table->entry[i * slit_table->locality_count + j];
592                 }
593         }
594
595 #ifdef SLIT_DEBUG
596         printk("ACPI 2.0 SLIT locality table:\n");
597         for_each_online_node(i) {
598                 for_each_online_node(j)
599                     printk("%03d ", node_distance(i, j));
600                 printk("\n");
601         }
602 #endif
603 }
604 #endif                          /* CONFIG_ACPI_NUMA */
605
606 /*
607  * success: return IRQ number (>=0)
608  * failure: return < 0
609  */
610 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
611 {
612         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
613                 return gsi;
614
615         if (has_8259 && gsi < 16)
616                 return isa_irq_to_vector(gsi);
617
618         return iosapic_register_intr(gsi,
619                                      (polarity ==
620                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
621                                      IOSAPIC_POL_LOW,
622                                      (triggering ==
623                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
624                                      IOSAPIC_LEVEL);
625 }
626 EXPORT_SYMBOL_GPL(acpi_register_gsi);
627
628 void acpi_unregister_gsi(u32 gsi)
629 {
630         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
631                 return;
632
633         if (has_8259 && gsi < 16)
634                 return;
635
636         iosapic_unregister_intr(gsi);
637 }
638 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
639
640 static int __init acpi_parse_fadt(struct acpi_table_header *table)
641 {
642         struct acpi_table_header *fadt_header;
643         struct acpi_table_fadt *fadt;
644
645         fadt_header = (struct acpi_table_header *)table;
646         if (fadt_header->revision != 3)
647                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
648
649         fadt = (struct acpi_table_fadt *)fadt_header;
650
651         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
652                                  ACPI_ACTIVE_LOW);
653         return 0;
654 }
655
656 int __init early_acpi_boot_init(void)
657 {
658         int ret;
659
660         /*
661          * do a partial walk of MADT to determine how many CPUs
662          * we have including offline CPUs
663          */
664         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
665                 printk(KERN_ERR PREFIX "Can't find MADT\n");
666                 return 0;
667         }
668
669         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
670                 acpi_parse_lsapic, NR_CPUS);
671         if (ret < 1)
672                 printk(KERN_ERR PREFIX
673                        "Error parsing MADT - no LAPIC entries\n");
674         else
675                 acpi_lapic = 1;
676
677 #ifdef CONFIG_SMP
678         if (available_cpus == 0) {
679                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
680                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
681                 smp_boot_data.cpu_phys_id[available_cpus] =
682                     hard_smp_processor_id();
683                 available_cpus = 1;     /* We've got at least one of these, no? */
684         }
685         smp_boot_data.cpu_count = available_cpus;
686 #endif
687         /* Make boot-up look pretty */
688         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
689                total_cpus);
690
691         return 0;
692 }
693
694 int __init acpi_boot_init(void)
695 {
696
697         /*
698          * MADT
699          * ----
700          * Parse the Multiple APIC Description Table (MADT), if exists.
701          * Note that this table provides platform SMP configuration
702          * information -- the successor to MPS tables.
703          */
704
705         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
706                 printk(KERN_ERR PREFIX "Can't find MADT\n");
707                 goto skip_madt;
708         }
709
710         /* Local APIC */
711
712         if (acpi_table_parse_madt
713             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
714                 printk(KERN_ERR PREFIX
715                        "Error parsing LAPIC address override entry\n");
716
717         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
718             < 0)
719                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
720
721         /* I/O APIC */
722
723         if (acpi_table_parse_madt
724             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
725                 if (!ia64_platform_is("sn2"))
726                         printk(KERN_ERR PREFIX
727                                "Error parsing MADT - no IOSAPIC entries\n");
728         }
729
730         /* System-Level Interrupt Routing */
731
732         if (acpi_table_parse_madt
733             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
734              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
735                 printk(KERN_ERR PREFIX
736                        "Error parsing platform interrupt source entry\n");
737
738         if (acpi_table_parse_madt
739             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
740                 printk(KERN_ERR PREFIX
741                        "Error parsing interrupt source overrides entry\n");
742
743         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
744                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
745       skip_madt:
746
747         /*
748          * FADT says whether a legacy keyboard controller is present.
749          * The FADT also contains an SCI_INT line, by which the system
750          * gets interrupts such as power and sleep buttons.  If it's not
751          * on a Legacy interrupt, it needs to be setup.
752          */
753         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
754                 printk(KERN_ERR PREFIX "Can't find FADT\n");
755
756 #ifdef CONFIG_ACPI_NUMA
757 #ifdef CONFIG_SMP
758         if (srat_num_cpus == 0) {
759                 int cpu, i = 1;
760                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
761                         if (smp_boot_data.cpu_phys_id[cpu] !=
762                             hard_smp_processor_id())
763                                 node_cpuid[i++].phys_id =
764                                     smp_boot_data.cpu_phys_id[cpu];
765         }
766 #endif
767         build_cpu_to_node_map();
768 #endif
769         return 0;
770 }
771
772 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
773 {
774         int tmp;
775
776         if (has_8259 && gsi < 16)
777                 *irq = isa_irq_to_vector(gsi);
778         else {
779                 tmp = gsi_to_irq(gsi);
780                 if (tmp == -1)
781                         return -1;
782                 *irq = tmp;
783         }
784         return 0;
785 }
786
787 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
788 {
789         if (isa_irq >= 16)
790                 return -1;
791         *gsi = isa_irq;
792         return 0;
793 }
794
795 /*
796  *  ACPI based hotplug CPU support
797  */
798 #ifdef CONFIG_ACPI_HOTPLUG_CPU
799 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
800 {
801 #ifdef CONFIG_ACPI_NUMA
802         /*
803          * We don't have cpu-only-node hotadd. But if the system equips
804          * SRAT table, pxm is already found and node is ready.
805          * So, just pxm_to_nid(pxm) is OK.
806          * This code here is for the system which doesn't have full SRAT
807          * table for possible cpus.
808          */
809         node_cpuid[cpu].phys_id = physid;
810         node_cpuid[cpu].nid = acpi_get_node(handle);
811 #endif
812         return 0;
813 }
814
815 int additional_cpus __initdata = -1;
816
817 static __init int setup_additional_cpus(char *s)
818 {
819         if (s)
820                 additional_cpus = simple_strtol(s, NULL, 0);
821
822         return 0;
823 }
824
825 early_param("additional_cpus", setup_additional_cpus);
826
827 /*
828  * cpu_possible_mask should be static, it cannot change as CPUs
829  * are onlined, or offlined. The reason is per-cpu data-structures
830  * are allocated by some modules at init time, and dont expect to
831  * do this dynamically on cpu arrival/departure.
832  * cpu_present_mask on the other hand can change dynamically.
833  * In case when cpu_hotplug is not compiled, then we resort to current
834  * behaviour, which is cpu_possible == cpu_present.
835  * - Ashok Raj
836  *
837  * Three ways to find out the number of additional hotplug CPUs:
838  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
839  * - The user can overwrite it with additional_cpus=NUM
840  * - Otherwise don't reserve additional CPUs.
841  */
842 __init void prefill_possible_map(void)
843 {
844         int i;
845         int possible, disabled_cpus;
846
847         disabled_cpus = total_cpus - available_cpus;
848
849         if (additional_cpus == -1) {
850                 if (disabled_cpus > 0)
851                         additional_cpus = disabled_cpus;
852                 else
853                         additional_cpus = 0;
854         }
855
856         possible = available_cpus + additional_cpus;
857
858         if (possible > nr_cpu_ids)
859                 possible = nr_cpu_ids;
860
861         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
862                 possible, max((possible - available_cpus), 0));
863
864         for (i = 0; i < possible; i++)
865                 set_cpu_possible(i, true);
866 }
867
868 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
869 {
870         cpumask_t tmp_map;
871         int cpu;
872
873         cpumask_complement(&tmp_map, cpu_present_mask);
874         cpu = cpumask_first(&tmp_map);
875         if (cpu >= nr_cpu_ids)
876                 return -EINVAL;
877
878         acpi_map_cpu2node(handle, cpu, physid);
879
880         set_cpu_present(cpu, true);
881         ia64_cpu_to_sapicid[cpu] = physid;
882
883         acpi_processor_set_pdc(handle);
884
885         *pcpu = cpu;
886         return (0);
887 }
888
889 /* wrapper to silence section mismatch warning */
890 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
891 {
892         return _acpi_map_lsapic(handle, physid, pcpu);
893 }
894 EXPORT_SYMBOL(acpi_map_cpu);
895
896 int acpi_unmap_cpu(int cpu)
897 {
898         ia64_cpu_to_sapicid[cpu] = -1;
899         set_cpu_present(cpu, false);
900
901 #ifdef CONFIG_ACPI_NUMA
902         /* NUMA specific cleanup's */
903 #endif
904
905         return (0);
906 }
907 EXPORT_SYMBOL(acpi_unmap_cpu);
908 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
909
910 #ifdef CONFIG_ACPI_NUMA
911 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
912                                     void *context, void **ret)
913 {
914         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
915         union acpi_object *obj;
916         struct acpi_madt_io_sapic *iosapic;
917         unsigned int gsi_base;
918         int node;
919
920         /* Only care about objects w/ a method that returns the MADT */
921         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
922                 return AE_OK;
923
924         if (!buffer.length || !buffer.pointer)
925                 return AE_OK;
926
927         obj = buffer.pointer;
928         if (obj->type != ACPI_TYPE_BUFFER ||
929             obj->buffer.length < sizeof(*iosapic)) {
930                 kfree(buffer.pointer);
931                 return AE_OK;
932         }
933
934         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
935
936         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
937                 kfree(buffer.pointer);
938                 return AE_OK;
939         }
940
941         gsi_base = iosapic->global_irq_base;
942
943         kfree(buffer.pointer);
944
945         /* OK, it's an IOSAPIC MADT entry; associate it with a node */
946         node = acpi_get_node(handle);
947         if (node == NUMA_NO_NODE || !node_online(node) ||
948             cpumask_empty(cpumask_of_node(node)))
949                 return AE_OK;
950
951         /* We know a gsi to node mapping! */
952         map_iosapic_to_node(gsi_base, node);
953         return AE_OK;
954 }
955
956 static int __init
957 acpi_map_iosapics (void)
958 {
959         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
960         return 0;
961 }
962
963 fs_initcall(acpi_map_iosapics);
964 #endif                          /* CONFIG_ACPI_NUMA */
965
966 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
967 {
968         int err;
969
970         if ((err = iosapic_init(phys_addr, gsi_base)))
971                 return err;
972
973 #ifdef CONFIG_ACPI_NUMA
974         acpi_map_iosapic(handle, 0, NULL, NULL);
975 #endif                          /* CONFIG_ACPI_NUMA */
976
977         return 0;
978 }
979
980 EXPORT_SYMBOL(acpi_register_ioapic);
981
982 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
983 {
984         return iosapic_remove(gsi_base);
985 }
986
987 EXPORT_SYMBOL(acpi_unregister_ioapic);
988
989 /*
990  * acpi_suspend_lowlevel() - save kernel state and suspend.
991  *
992  * TBD when when IA64 starts to support suspend...
993  */
994 int acpi_suspend_lowlevel(void) { return 0; }