ef2fe474f107319c90af67317de180162d22ed2b
[linux-2.6.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 <asm/io.h>
48 #include <asm/iosapic.h>
49 #include <asm/machvec.h>
50 #include <asm/page.h>
51 #include <asm/system.h>
52 #include <asm/numa.h>
53 #include <asm/sal.h>
54 #include <asm/cyclone.h>
55
56 #define BAD_MADT_ENTRY(entry, end) (                                        \
57                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
58                 ((acpi_table_entry_header *)entry)->length < sizeof(*entry))
59
60 #define PREFIX                  "ACPI: "
61
62 void (*pm_idle) (void);
63 EXPORT_SYMBOL(pm_idle);
64 void (*pm_power_off) (void);
65 EXPORT_SYMBOL(pm_power_off);
66
67 unsigned int acpi_cpei_override;
68 unsigned int acpi_cpei_phys_cpuid;
69
70 #define MAX_SAPICS 256
71 u16 ia64_acpiid_to_sapicid[MAX_SAPICS] = {[0 ... MAX_SAPICS - 1] = -1 };
72
73 EXPORT_SYMBOL(ia64_acpiid_to_sapicid);
74
75 const char *acpi_get_sysname(void)
76 {
77 #ifdef CONFIG_IA64_GENERIC
78         unsigned long rsdp_phys;
79         struct acpi20_table_rsdp *rsdp;
80         struct acpi_table_xsdt *xsdt;
81         struct acpi_table_header *hdr;
82
83         rsdp_phys = acpi_find_rsdp();
84         if (!rsdp_phys) {
85                 printk(KERN_ERR
86                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
87                 return "dig";
88         }
89
90         rsdp = (struct acpi20_table_rsdp *)__va(rsdp_phys);
91         if (strncmp(rsdp->signature, RSDP_SIG, sizeof(RSDP_SIG) - 1)) {
92                 printk(KERN_ERR
93                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
94                 return "dig";
95         }
96
97         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_address);
98         hdr = &xsdt->header;
99         if (strncmp(hdr->signature, XSDT_SIG, sizeof(XSDT_SIG) - 1)) {
100                 printk(KERN_ERR
101                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
102                 return "dig";
103         }
104
105         if (!strcmp(hdr->oem_id, "HP")) {
106                 return "hpzx1";
107         } else if (!strcmp(hdr->oem_id, "SGI")) {
108                 return "sn2";
109         }
110
111         return "dig";
112 #else
113 # if defined (CONFIG_IA64_HP_SIM)
114         return "hpsim";
115 # elif defined (CONFIG_IA64_HP_ZX1)
116         return "hpzx1";
117 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
118         return "hpzx1_swiotlb";
119 # elif defined (CONFIG_IA64_SGI_SN2)
120         return "sn2";
121 # elif defined (CONFIG_IA64_DIG)
122         return "dig";
123 # else
124 #       error Unknown platform.  Fix acpi.c.
125 # endif
126 #endif
127 }
128
129 #ifdef CONFIG_ACPI
130
131 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
132
133 /* Array to record platform interrupt vectors for generic interrupt routing. */
134 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
135         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
136 };
137
138 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
139
140 /*
141  * Interrupt routing API for device drivers.  Provides interrupt vector for
142  * a generic platform event.  Currently only CPEI is implemented.
143  */
144 int acpi_request_vector(u32 int_type)
145 {
146         int vector = -1;
147
148         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
149                 /* corrected platform error interrupt */
150                 vector = platform_intr_list[int_type];
151         } else
152                 printk(KERN_ERR
153                        "acpi_request_vector(): invalid interrupt type\n");
154         return vector;
155 }
156
157 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
158 {
159         return __va(phys_addr);
160 }
161
162 /* --------------------------------------------------------------------------
163                             Boot-time Table Parsing
164    -------------------------------------------------------------------------- */
165
166 static int total_cpus __initdata;
167 static int available_cpus __initdata;
168 struct acpi_table_madt *acpi_madt __initdata;
169 static u8 has_8259;
170
171 static int __init
172 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
173                           const unsigned long end)
174 {
175         struct acpi_table_lapic_addr_ovr *lapic;
176
177         lapic = (struct acpi_table_lapic_addr_ovr *)header;
178
179         if (BAD_MADT_ENTRY(lapic, end))
180                 return -EINVAL;
181
182         if (lapic->address) {
183                 iounmap(ipi_base_addr);
184                 ipi_base_addr = ioremap(lapic->address, 0);
185         }
186         return 0;
187 }
188
189 static int __init
190 acpi_parse_lsapic(acpi_table_entry_header * header, const unsigned long end)
191 {
192         struct acpi_table_lsapic *lsapic;
193
194         lsapic = (struct acpi_table_lsapic *)header;
195
196         if (BAD_MADT_ENTRY(lsapic, end))
197                 return -EINVAL;
198
199         if (lsapic->flags.enabled) {
200 #ifdef CONFIG_SMP
201                 smp_boot_data.cpu_phys_id[available_cpus] =
202                     (lsapic->id << 8) | lsapic->eid;
203 #endif
204                 ia64_acpiid_to_sapicid[lsapic->acpi_id] =
205                     (lsapic->id << 8) | lsapic->eid;
206                 ++available_cpus;
207         }
208
209         total_cpus++;
210         return 0;
211 }
212
213 static int __init
214 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
215 {
216         struct acpi_table_lapic_nmi *lacpi_nmi;
217
218         lacpi_nmi = (struct acpi_table_lapic_nmi *)header;
219
220         if (BAD_MADT_ENTRY(lacpi_nmi, end))
221                 return -EINVAL;
222
223         /* TBD: Support lapic_nmi entries */
224         return 0;
225 }
226
227 static int __init
228 acpi_parse_iosapic(acpi_table_entry_header * header, const unsigned long end)
229 {
230         struct acpi_table_iosapic *iosapic;
231
232         iosapic = (struct acpi_table_iosapic *)header;
233
234         if (BAD_MADT_ENTRY(iosapic, end))
235                 return -EINVAL;
236
237         return iosapic_init(iosapic->address, iosapic->global_irq_base);
238 }
239
240 static unsigned int __initdata acpi_madt_rev;
241
242 static int __init
243 acpi_parse_plat_int_src(acpi_table_entry_header * header,
244                         const unsigned long end)
245 {
246         struct acpi_table_plat_int_src *plintsrc;
247         int vector;
248
249         plintsrc = (struct acpi_table_plat_int_src *)header;
250
251         if (BAD_MADT_ENTRY(plintsrc, end))
252                 return -EINVAL;
253
254         /*
255          * Get vector assignment for this interrupt, set attributes,
256          * and program the IOSAPIC routing table.
257          */
258         vector = iosapic_register_platform_intr(plintsrc->type,
259                                                 plintsrc->global_irq,
260                                                 plintsrc->iosapic_vector,
261                                                 plintsrc->eid,
262                                                 plintsrc->id,
263                                                 (plintsrc->flags.polarity ==
264                                                  1) ? IOSAPIC_POL_HIGH :
265                                                 IOSAPIC_POL_LOW,
266                                                 (plintsrc->flags.trigger ==
267                                                  1) ? IOSAPIC_EDGE :
268                                                 IOSAPIC_LEVEL);
269
270         platform_intr_list[plintsrc->type] = vector;
271         if (acpi_madt_rev > 1) {
272                 acpi_cpei_override = plintsrc->plint_flags.cpei_override_flag;
273         }
274
275         /*
276          * Save the physical id, so we can check when its being removed
277          */
278         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
279
280         return 0;
281 }
282
283 #ifdef CONFIG_HOTPLUG_CPU
284 unsigned int can_cpei_retarget(void)
285 {
286         extern int cpe_vector;
287         extern unsigned int force_cpei_retarget;
288
289         /*
290          * Only if CPEI is supported and the override flag
291          * is present, otherwise return that its re-targettable
292          * if we are in polling mode.
293          */
294         if (cpe_vector > 0) {
295                 if (acpi_cpei_override || force_cpei_retarget)
296                         return 1;
297                 else
298                         return 0;
299         }
300         return 1;
301 }
302
303 unsigned int is_cpu_cpei_target(unsigned int cpu)
304 {
305         unsigned int logical_id;
306
307         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
308
309         if (logical_id == cpu)
310                 return 1;
311         else
312                 return 0;
313 }
314
315 void set_cpei_target_cpu(unsigned int cpu)
316 {
317         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
318 }
319 #endif
320
321 unsigned int get_cpei_target_cpu(void)
322 {
323         return acpi_cpei_phys_cpuid;
324 }
325
326 static int __init
327 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
328                        const unsigned long end)
329 {
330         struct acpi_table_int_src_ovr *p;
331
332         p = (struct acpi_table_int_src_ovr *)header;
333
334         if (BAD_MADT_ENTRY(p, end))
335                 return -EINVAL;
336
337         iosapic_override_isa_irq(p->bus_irq, p->global_irq,
338                                  (p->flags.polarity ==
339                                   1) ? IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
340                                  (p->flags.trigger ==
341                                   1) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);
342         return 0;
343 }
344
345 static int __init
346 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
347 {
348         struct acpi_table_nmi_src *nmi_src;
349
350         nmi_src = (struct acpi_table_nmi_src *)header;
351
352         if (BAD_MADT_ENTRY(nmi_src, end))
353                 return -EINVAL;
354
355         /* TBD: Support nimsrc entries */
356         return 0;
357 }
358
359 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
360 {
361         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
362
363                 /*
364                  * Unfortunately ITC_DRIFT is not yet part of the
365                  * official SAL spec, so the ITC_DRIFT bit is not
366                  * set by the BIOS on this hardware.
367                  */
368                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
369
370                 cyclone_setup();
371         }
372 }
373
374 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
375 {
376         if (!phys_addr || !size)
377                 return -EINVAL;
378
379         acpi_madt = (struct acpi_table_madt *)__va(phys_addr);
380
381         acpi_madt_rev = acpi_madt->header.revision;
382
383         /* remember the value for reference after free_initmem() */
384 #ifdef CONFIG_ITANIUM
385         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
386 #else
387         has_8259 = acpi_madt->flags.pcat_compat;
388 #endif
389         iosapic_system_init(has_8259);
390
391         /* Get base address of IPI Message Block */
392
393         if (acpi_madt->lapic_address)
394                 ipi_base_addr = ioremap(acpi_madt->lapic_address, 0);
395
396         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
397
398         acpi_madt_oem_check(acpi_madt->header.oem_id,
399                             acpi_madt->header.oem_table_id);
400
401         return 0;
402 }
403
404 #ifdef CONFIG_ACPI_NUMA
405
406 #undef SLIT_DEBUG
407
408 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
409
410 static int __initdata srat_num_cpus;    /* number of cpus */
411 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
412 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
413 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
414 static struct acpi_table_slit __initdata *slit_table;
415
416 static int get_processor_proximity_domain(struct acpi_table_processor_affinity *pa)
417 {
418         int pxm;
419
420         pxm = pa->proximity_domain;
421         if (ia64_platform_is("sn2"))
422                 pxm += pa->reserved[0] << 8;
423         return pxm;
424 }
425
426 static int get_memory_proximity_domain(struct acpi_table_memory_affinity *ma)
427 {
428         int pxm;
429
430         pxm = ma->proximity_domain;
431         if (ia64_platform_is("sn2"))
432                 pxm += ma->reserved1[0] << 8;
433         return pxm;
434 }
435
436 /*
437  * ACPI 2.0 SLIT (System Locality Information Table)
438  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
439  */
440 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
441 {
442         u32 len;
443
444         len = sizeof(struct acpi_table_header) + 8
445             + slit->localities * slit->localities;
446         if (slit->header.length != len) {
447                 printk(KERN_ERR
448                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
449                        len, slit->header.length);
450                 memset(numa_slit, 10, sizeof(numa_slit));
451                 return;
452         }
453         slit_table = slit;
454 }
455
456 void __init
457 acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa)
458 {
459         int pxm;
460
461         if (!pa->flags.enabled)
462                 return;
463
464         pxm = get_processor_proximity_domain(pa);
465
466         /* record this node in proximity bitmap */
467         pxm_bit_set(pxm);
468
469         node_cpuid[srat_num_cpus].phys_id =
470             (pa->apic_id << 8) | (pa->lsapic_eid);
471         /* nid should be overridden as logical node id later */
472         node_cpuid[srat_num_cpus].nid = pxm;
473         srat_num_cpus++;
474 }
475
476 void __init
477 acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
478 {
479         unsigned long paddr, size;
480         int pxm;
481         struct node_memblk_s *p, *q, *pend;
482
483         pxm = get_memory_proximity_domain(ma);
484
485         /* fill node memory chunk structure */
486         paddr = ma->base_addr_hi;
487         paddr = (paddr << 32) | ma->base_addr_lo;
488         size = ma->length_hi;
489         size = (size << 32) | ma->length_lo;
490
491         /* Ignore disabled entries */
492         if (!ma->flags.enabled)
493                 return;
494
495         /* record this node in proximity bitmap */
496         pxm_bit_set(pxm);
497
498         /* Insertion sort based on base address */
499         pend = &node_memblk[num_node_memblks];
500         for (p = &node_memblk[0]; p < pend; p++) {
501                 if (paddr < p->start_paddr)
502                         break;
503         }
504         if (p < pend) {
505                 for (q = pend - 1; q >= p; q--)
506                         *(q + 1) = *q;
507         }
508         p->start_paddr = paddr;
509         p->size = size;
510         p->nid = pxm;
511         num_node_memblks++;
512 }
513
514 void __init acpi_numa_arch_fixup(void)
515 {
516         int i, j, node_from, node_to;
517
518         /* If there's no SRAT, fix the phys_id and mark node 0 online */
519         if (srat_num_cpus == 0) {
520                 node_set_online(0);
521                 node_cpuid[0].phys_id = hard_smp_processor_id();
522                 return;
523         }
524
525         /*
526          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
527          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
528          */
529         nodes_clear(node_online_map);
530         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
531                 if (pxm_bit_test(i)) {
532                         int nid = acpi_map_pxm_to_node(i);
533                         node_set_online(nid);
534                 }
535         }
536
537         /* set logical node id in memory chunk structure */
538         for (i = 0; i < num_node_memblks; i++)
539                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
540
541         /* assign memory bank numbers for each chunk on each node */
542         for_each_online_node(i) {
543                 int bank;
544
545                 bank = 0;
546                 for (j = 0; j < num_node_memblks; j++)
547                         if (node_memblk[j].nid == i)
548                                 node_memblk[j].bank = bank++;
549         }
550
551         /* set logical node id in cpu structure */
552         for (i = 0; i < srat_num_cpus; i++)
553                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
554
555         printk(KERN_INFO "Number of logical nodes in system = %d\n",
556                num_online_nodes());
557         printk(KERN_INFO "Number of memory chunks in system = %d\n",
558                num_node_memblks);
559
560         if (!slit_table)
561                 return;
562         memset(numa_slit, -1, sizeof(numa_slit));
563         for (i = 0; i < slit_table->localities; i++) {
564                 if (!pxm_bit_test(i))
565                         continue;
566                 node_from = pxm_to_node(i);
567                 for (j = 0; j < slit_table->localities; j++) {
568                         if (!pxm_bit_test(j))
569                                 continue;
570                         node_to = pxm_to_node(j);
571                         node_distance(node_from, node_to) =
572                             slit_table->entry[i * slit_table->localities + j];
573                 }
574         }
575
576 #ifdef SLIT_DEBUG
577         printk("ACPI 2.0 SLIT locality table:\n");
578         for_each_online_node(i) {
579                 for_each_online_node(j)
580                     printk("%03d ", node_distance(i, j));
581                 printk("\n");
582         }
583 #endif
584 }
585 #endif                          /* CONFIG_ACPI_NUMA */
586
587 /*
588  * success: return IRQ number (>=0)
589  * failure: return < 0
590  */
591 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
592 {
593         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
594                 return gsi;
595
596         if (has_8259 && gsi < 16)
597                 return isa_irq_to_vector(gsi);
598
599         return iosapic_register_intr(gsi,
600                                      (polarity ==
601                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
602                                      IOSAPIC_POL_LOW,
603                                      (triggering ==
604                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
605                                      IOSAPIC_LEVEL);
606 }
607
608 EXPORT_SYMBOL(acpi_register_gsi);
609
610 void acpi_unregister_gsi(u32 gsi)
611 {
612         iosapic_unregister_intr(gsi);
613 }
614
615 EXPORT_SYMBOL(acpi_unregister_gsi);
616
617 static int __init acpi_parse_fadt(unsigned long phys_addr, unsigned long size)
618 {
619         struct acpi_table_header *fadt_header;
620         struct fadt_descriptor *fadt;
621
622         if (!phys_addr || !size)
623                 return -EINVAL;
624
625         fadt_header = (struct acpi_table_header *)__va(phys_addr);
626         if (fadt_header->revision != 3)
627                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
628
629         fadt = (struct fadt_descriptor *)fadt_header;
630
631         acpi_register_gsi(fadt->sci_int, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
632         return 0;
633 }
634
635 unsigned long __init acpi_find_rsdp(void)
636 {
637         unsigned long rsdp_phys = 0;
638
639         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
640                 rsdp_phys = efi.acpi20;
641         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
642                 printk(KERN_WARNING PREFIX
643                        "v1.0/r0.71 tables no longer supported\n");
644         return rsdp_phys;
645 }
646
647 int __init acpi_boot_init(void)
648 {
649
650         /*
651          * MADT
652          * ----
653          * Parse the Multiple APIC Description Table (MADT), if exists.
654          * Note that this table provides platform SMP configuration
655          * information -- the successor to MPS tables.
656          */
657
658         if (acpi_table_parse(ACPI_APIC, acpi_parse_madt) < 1) {
659                 printk(KERN_ERR PREFIX "Can't find MADT\n");
660                 goto skip_madt;
661         }
662
663         /* Local APIC */
664
665         if (acpi_table_parse_madt
666             (ACPI_MADT_LAPIC_ADDR_OVR, acpi_parse_lapic_addr_ovr, 0) < 0)
667                 printk(KERN_ERR PREFIX
668                        "Error parsing LAPIC address override entry\n");
669
670         if (acpi_table_parse_madt(ACPI_MADT_LSAPIC, acpi_parse_lsapic, NR_CPUS)
671             < 1)
672                 printk(KERN_ERR PREFIX
673                        "Error parsing MADT - no LAPIC entries\n");
674
675         if (acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0)
676             < 0)
677                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
678
679         /* I/O APIC */
680
681         if (acpi_table_parse_madt
682             (ACPI_MADT_IOSAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1)
683                 printk(KERN_ERR PREFIX
684                        "Error parsing MADT - no IOSAPIC entries\n");
685
686         /* System-Level Interrupt Routing */
687
688         if (acpi_table_parse_madt
689             (ACPI_MADT_PLAT_INT_SRC, acpi_parse_plat_int_src,
690              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
691                 printk(KERN_ERR PREFIX
692                        "Error parsing platform interrupt source entry\n");
693
694         if (acpi_table_parse_madt
695             (ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr, 0) < 0)
696                 printk(KERN_ERR PREFIX
697                        "Error parsing interrupt source overrides entry\n");
698
699         if (acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src, 0) < 0)
700                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
701       skip_madt:
702
703         /*
704          * FADT says whether a legacy keyboard controller is present.
705          * The FADT also contains an SCI_INT line, by which the system
706          * gets interrupts such as power and sleep buttons.  If it's not
707          * on a Legacy interrupt, it needs to be setup.
708          */
709         if (acpi_table_parse(ACPI_FADT, acpi_parse_fadt) < 1)
710                 printk(KERN_ERR PREFIX "Can't find FADT\n");
711
712 #ifdef CONFIG_SMP
713         if (available_cpus == 0) {
714                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
715                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
716                 smp_boot_data.cpu_phys_id[available_cpus] =
717                     hard_smp_processor_id();
718                 available_cpus = 1;     /* We've got at least one of these, no? */
719         }
720         smp_boot_data.cpu_count = available_cpus;
721
722         smp_build_cpu_map();
723 # ifdef CONFIG_ACPI_NUMA
724         if (srat_num_cpus == 0) {
725                 int cpu, i = 1;
726                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
727                         if (smp_boot_data.cpu_phys_id[cpu] !=
728                             hard_smp_processor_id())
729                                 node_cpuid[i++].phys_id =
730                                     smp_boot_data.cpu_phys_id[cpu];
731         }
732 # endif
733 #endif
734 #ifdef CONFIG_ACPI_NUMA
735         build_cpu_to_node_map();
736 #endif
737         /* Make boot-up look pretty */
738         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
739                total_cpus);
740         return 0;
741 }
742
743 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
744 {
745         int vector;
746
747         if (has_8259 && gsi < 16)
748                 *irq = isa_irq_to_vector(gsi);
749         else {
750                 vector = gsi_to_vector(gsi);
751                 if (vector == -1)
752                         return -1;
753
754                 *irq = vector;
755         }
756         return 0;
757 }
758
759 /*
760  *  ACPI based hotplug CPU support
761  */
762 #ifdef CONFIG_ACPI_HOTPLUG_CPU
763 static
764 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
765 {
766 #ifdef CONFIG_ACPI_NUMA
767         int pxm_id;
768         int nid;
769
770         pxm_id = acpi_get_pxm(handle);
771         /*
772          * We don't have cpu-only-node hotadd. But if the system equips
773          * SRAT table, pxm is already found and node is ready.
774          * So, just pxm_to_nid(pxm) is OK.
775          * This code here is for the system which doesn't have full SRAT
776          * table for possible cpus.
777          */
778         nid = acpi_map_pxm_to_node(pxm_id);
779         node_cpuid[cpu].phys_id = physid;
780         node_cpuid[cpu].nid = nid;
781 #endif
782         return (0);
783 }
784
785 int additional_cpus __initdata = -1;
786
787 static __init int setup_additional_cpus(char *s)
788 {
789         if (s)
790                 additional_cpus = simple_strtol(s, NULL, 0);
791
792         return 0;
793 }
794
795 early_param("additional_cpus", setup_additional_cpus);
796
797 /*
798  * cpu_possible_map should be static, it cannot change as cpu's
799  * are onlined, or offlined. The reason is per-cpu data-structures
800  * are allocated by some modules at init time, and dont expect to
801  * do this dynamically on cpu arrival/departure.
802  * cpu_present_map on the other hand can change dynamically.
803  * In case when cpu_hotplug is not compiled, then we resort to current
804  * behaviour, which is cpu_possible == cpu_present.
805  * - Ashok Raj
806  *
807  * Three ways to find out the number of additional hotplug CPUs:
808  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
809  * - The user can overwrite it with additional_cpus=NUM
810  * - Otherwise don't reserve additional CPUs.
811  */
812 __init void prefill_possible_map(void)
813 {
814         int i;
815         int possible, disabled_cpus;
816
817         disabled_cpus = total_cpus - available_cpus;
818
819         if (additional_cpus == -1) {
820                 if (disabled_cpus > 0)
821                         additional_cpus = disabled_cpus;
822                 else
823                         additional_cpus = 0;
824         }
825
826         possible = available_cpus + additional_cpus;
827
828         if (possible > NR_CPUS)
829                 possible = NR_CPUS;
830
831         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
832                 possible, max((possible - available_cpus), 0));
833
834         for (i = 0; i < possible; i++)
835                 cpu_set(i, cpu_possible_map);
836 }
837
838 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
839 {
840         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
841         union acpi_object *obj;
842         struct acpi_table_lsapic *lsapic;
843         cpumask_t tmp_map;
844         long physid;
845         int cpu;
846
847         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
848                 return -EINVAL;
849
850         if (!buffer.length || !buffer.pointer)
851                 return -EINVAL;
852
853         obj = buffer.pointer;
854         if (obj->type != ACPI_TYPE_BUFFER ||
855             obj->buffer.length < sizeof(*lsapic)) {
856                 kfree(buffer.pointer);
857                 return -EINVAL;
858         }
859
860         lsapic = (struct acpi_table_lsapic *)obj->buffer.pointer;
861
862         if ((lsapic->header.type != ACPI_MADT_LSAPIC) ||
863             (!lsapic->flags.enabled)) {
864                 kfree(buffer.pointer);
865                 return -EINVAL;
866         }
867
868         physid = ((lsapic->id << 8) | (lsapic->eid));
869
870         kfree(buffer.pointer);
871         buffer.length = ACPI_ALLOCATE_BUFFER;
872         buffer.pointer = NULL;
873
874         cpus_complement(tmp_map, cpu_present_map);
875         cpu = first_cpu(tmp_map);
876         if (cpu >= NR_CPUS)
877                 return -EINVAL;
878
879         acpi_map_cpu2node(handle, cpu, physid);
880
881         cpu_set(cpu, cpu_present_map);
882         ia64_cpu_to_sapicid[cpu] = physid;
883         ia64_acpiid_to_sapicid[lsapic->acpi_id] = ia64_cpu_to_sapicid[cpu];
884
885         *pcpu = cpu;
886         return (0);
887 }
888
889 EXPORT_SYMBOL(acpi_map_lsapic);
890
891 int acpi_unmap_lsapic(int cpu)
892 {
893         int i;
894
895         for (i = 0; i < MAX_SAPICS; i++) {
896                 if (ia64_acpiid_to_sapicid[i] == ia64_cpu_to_sapicid[cpu]) {
897                         ia64_acpiid_to_sapicid[i] = -1;
898                         break;
899                 }
900         }
901         ia64_cpu_to_sapicid[cpu] = -1;
902         cpu_clear(cpu, cpu_present_map);
903
904 #ifdef CONFIG_ACPI_NUMA
905         /* NUMA specific cleanup's */
906 #endif
907
908         return (0);
909 }
910
911 EXPORT_SYMBOL(acpi_unmap_lsapic);
912 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
913
914 #ifdef CONFIG_ACPI_NUMA
915 static acpi_status __devinit
916 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
917 {
918         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
919         union acpi_object *obj;
920         struct acpi_table_iosapic *iosapic;
921         unsigned int gsi_base;
922         int pxm, node;
923
924         /* Only care about objects w/ a method that returns the MADT */
925         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
926                 return AE_OK;
927
928         if (!buffer.length || !buffer.pointer)
929                 return AE_OK;
930
931         obj = buffer.pointer;
932         if (obj->type != ACPI_TYPE_BUFFER ||
933             obj->buffer.length < sizeof(*iosapic)) {
934                 kfree(buffer.pointer);
935                 return AE_OK;
936         }
937
938         iosapic = (struct acpi_table_iosapic *)obj->buffer.pointer;
939
940         if (iosapic->header.type != ACPI_MADT_IOSAPIC) {
941                 kfree(buffer.pointer);
942                 return AE_OK;
943         }
944
945         gsi_base = iosapic->global_irq_base;
946
947         kfree(buffer.pointer);
948
949         /*
950          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
951          * us which node to associate this with.
952          */
953         pxm = acpi_get_pxm(handle);
954         if (pxm < 0)
955                 return AE_OK;
956
957         node = pxm_to_node(pxm);
958
959         if (node >= MAX_NUMNODES || !node_online(node) ||
960             cpus_empty(node_to_cpumask(node)))
961                 return AE_OK;
962
963         /* We know a gsi to node mapping! */
964         map_iosapic_to_node(gsi_base, node);
965         return AE_OK;
966 }
967
968 static int __init
969 acpi_map_iosapics (void)
970 {
971         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
972         return 0;
973 }
974
975 fs_initcall(acpi_map_iosapics);
976 #endif                          /* CONFIG_ACPI_NUMA */
977
978 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
979 {
980         int err;
981
982         if ((err = iosapic_init(phys_addr, gsi_base)))
983                 return err;
984
985 #ifdef CONFIG_ACPI_NUMA
986         acpi_map_iosapic(handle, 0, NULL, NULL);
987 #endif                          /* CONFIG_ACPI_NUMA */
988
989         return 0;
990 }
991
992 EXPORT_SYMBOL(acpi_register_ioapic);
993
994 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
995 {
996         return iosapic_remove(gsi_base);
997 }
998
999 EXPORT_SYMBOL(acpi_unregister_ioapic);
1000
1001 #endif                          /* CONFIG_ACPI */