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TOMOYO Linux Cross Reference
Linux/arch/x86/kernel/acpi/boot.c

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  1 /*
  2  *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
  3  *
  4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  5  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
  6  *
  7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  8  *
  9  *  This program is free software; you can redistribute it and/or modify
 10  *  it under the terms of the GNU General Public License as published by
 11  *  the Free Software Foundation; either version 2 of the License, or
 12  *  (at your option) any later version.
 13  *
 14  *  This program is distributed in the hope that it will be useful,
 15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  *  GNU General Public License for more details.
 18  *
 19  *  You should have received a copy of the GNU General Public License
 20  *  along with this program; if not, write to the Free Software
 21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 22  *
 23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 24  */
 25 
 26 #include <linux/init.h>
 27 #include <linux/acpi.h>
 28 #include <linux/acpi_pmtmr.h>
 29 #include <linux/efi.h>
 30 #include <linux/cpumask.h>
 31 #include <linux/export.h>
 32 #include <linux/dmi.h>
 33 #include <linux/irq.h>
 34 #include <linux/slab.h>
 35 #include <linux/bootmem.h>
 36 #include <linux/ioport.h>
 37 #include <linux/pci.h>
 38 #include <linux/efi-bgrt.h>
 39 
 40 #include <asm/e820/api.h>
 41 #include <asm/irqdomain.h>
 42 #include <asm/pci_x86.h>
 43 #include <asm/pgtable.h>
 44 #include <asm/io_apic.h>
 45 #include <asm/apic.h>
 46 #include <asm/io.h>
 47 #include <asm/mpspec.h>
 48 #include <asm/smp.h>
 49 #include <asm/i8259.h>
 50 
 51 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
 52 static int __initdata acpi_force = 0;
 53 int acpi_disabled;
 54 EXPORT_SYMBOL(acpi_disabled);
 55 
 56 #ifdef  CONFIG_X86_64
 57 # include <asm/proto.h>
 58 #endif                          /* X86 */
 59 
 60 #define PREFIX                  "ACPI: "
 61 
 62 int acpi_noirq;                         /* skip ACPI IRQ initialization */
 63 int acpi_pci_disabled;          /* skip ACPI PCI scan and IRQ initialization */
 64 EXPORT_SYMBOL(acpi_pci_disabled);
 65 
 66 int acpi_lapic;
 67 int acpi_ioapic;
 68 int acpi_strict;
 69 int acpi_disable_cmcff;
 70 
 71 u8 acpi_sci_flags __initdata;
 72 int acpi_sci_override_gsi __initdata;
 73 int acpi_skip_timer_override __initdata;
 74 int acpi_use_timer_override __initdata;
 75 int acpi_fix_pin2_polarity __initdata;
 76 
 77 #ifdef CONFIG_X86_LOCAL_APIC
 78 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
 79 #endif
 80 
 81 #ifdef CONFIG_X86_IO_APIC
 82 /*
 83  * Locks related to IOAPIC hotplug
 84  * Hotplug side:
 85  *      ->device_hotplug_lock
 86  *              ->acpi_ioapic_lock
 87  *                      ->ioapic_lock
 88  * Interrupt mapping side:
 89  *      ->acpi_ioapic_lock
 90  *              ->ioapic_mutex
 91  *                      ->ioapic_lock
 92  */
 93 static DEFINE_MUTEX(acpi_ioapic_lock);
 94 #endif
 95 
 96 /* --------------------------------------------------------------------------
 97                               Boot-time Configuration
 98    -------------------------------------------------------------------------- */
 99 
100 /*
101  * The default interrupt routing model is PIC (8259).  This gets
102  * overridden if IOAPICs are enumerated (below).
103  */
104 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
105 
106 
107 /*
108  * ISA irqs by default are the first 16 gsis but can be
109  * any gsi as specified by an interrupt source override.
110  */
111 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
112         0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
113 };
114 
115 #define ACPI_INVALID_GSI                INT_MIN
116 
117 /*
118  * This is just a simple wrapper around early_ioremap(),
119  * with sanity checks for phys == 0 and size == 0.
120  */
121 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
122 {
123 
124         if (!phys || !size)
125                 return NULL;
126 
127         return early_ioremap(phys, size);
128 }
129 
130 void __init __acpi_unmap_table(char *map, unsigned long size)
131 {
132         if (!map || !size)
133                 return;
134 
135         early_iounmap(map, size);
136 }
137 
138 #ifdef CONFIG_X86_LOCAL_APIC
139 static int __init acpi_parse_madt(struct acpi_table_header *table)
140 {
141         struct acpi_table_madt *madt = NULL;
142 
143         if (!boot_cpu_has(X86_FEATURE_APIC))
144                 return -EINVAL;
145 
146         madt = (struct acpi_table_madt *)table;
147         if (!madt) {
148                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
149                 return -ENODEV;
150         }
151 
152         if (madt->address) {
153                 acpi_lapic_addr = (u64) madt->address;
154 
155                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
156                        madt->address);
157         }
158 
159         default_acpi_madt_oem_check(madt->header.oem_id,
160                                     madt->header.oem_table_id);
161 
162         return 0;
163 }
164 
165 /**
166  * acpi_register_lapic - register a local apic and generates a logic cpu number
167  * @id: local apic id to register
168  * @acpiid: ACPI id to register
169  * @enabled: this cpu is enabled or not
170  *
171  * Returns the logic cpu number which maps to the local apic
172  */
173 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
174 {
175         unsigned int ver = 0;
176         int cpu;
177 
178         if (id >= MAX_LOCAL_APIC) {
179                 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
180                 return -EINVAL;
181         }
182 
183         if (!enabled) {
184                 ++disabled_cpus;
185                 return -EINVAL;
186         }
187 
188         if (boot_cpu_physical_apicid != -1U)
189                 ver = boot_cpu_apic_version;
190 
191         cpu = generic_processor_info(id, ver);
192         if (cpu >= 0)
193                 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
194 
195         return cpu;
196 }
197 
198 static int __init
199 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
200 {
201         struct acpi_madt_local_x2apic *processor = NULL;
202         int apic_id;
203         u8 enabled;
204 
205         processor = (struct acpi_madt_local_x2apic *)header;
206 
207         if (BAD_MADT_ENTRY(processor, end))
208                 return -EINVAL;
209 
210         acpi_table_print_madt_entry(header);
211 
212         apic_id = processor->local_apic_id;
213         enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
214 #ifdef CONFIG_X86_X2APIC
215         /*
216          * We need to register disabled CPU as well to permit
217          * counting disabled CPUs. This allows us to size
218          * cpus_possible_map more accurately, to permit
219          * to not preallocating memory for all NR_CPUS
220          * when we use CPU hotplug.
221          */
222         if (!apic->apic_id_valid(apic_id) && enabled)
223                 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
224         else
225                 acpi_register_lapic(apic_id, processor->uid, enabled);
226 #else
227         printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
228 #endif
229 
230         return 0;
231 }
232 
233 static int __init
234 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
235 {
236         struct acpi_madt_local_apic *processor = NULL;
237 
238         processor = (struct acpi_madt_local_apic *)header;
239 
240         if (BAD_MADT_ENTRY(processor, end))
241                 return -EINVAL;
242 
243         acpi_table_print_madt_entry(header);
244 
245         /* Ignore invalid ID */
246         if (processor->id == 0xff)
247                 return 0;
248 
249         /*
250          * We need to register disabled CPU as well to permit
251          * counting disabled CPUs. This allows us to size
252          * cpus_possible_map more accurately, to permit
253          * to not preallocating memory for all NR_CPUS
254          * when we use CPU hotplug.
255          */
256         acpi_register_lapic(processor->id,      /* APIC ID */
257                             processor->processor_id, /* ACPI ID */
258                             processor->lapic_flags & ACPI_MADT_ENABLED);
259 
260         return 0;
261 }
262 
263 static int __init
264 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
265 {
266         struct acpi_madt_local_sapic *processor = NULL;
267 
268         processor = (struct acpi_madt_local_sapic *)header;
269 
270         if (BAD_MADT_ENTRY(processor, end))
271                 return -EINVAL;
272 
273         acpi_table_print_madt_entry(header);
274 
275         acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
276                             processor->processor_id, /* ACPI ID */
277                             processor->lapic_flags & ACPI_MADT_ENABLED);
278 
279         return 0;
280 }
281 
282 static int __init
283 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
284                           const unsigned long end)
285 {
286         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
287 
288         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
289 
290         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
291                 return -EINVAL;
292 
293         acpi_table_print_madt_entry(header);
294 
295         acpi_lapic_addr = lapic_addr_ovr->address;
296 
297         return 0;
298 }
299 
300 static int __init
301 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
302                       const unsigned long end)
303 {
304         struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
305 
306         x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
307 
308         if (BAD_MADT_ENTRY(x2apic_nmi, end))
309                 return -EINVAL;
310 
311         acpi_table_print_madt_entry(header);
312 
313         if (x2apic_nmi->lint != 1)
314                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
315 
316         return 0;
317 }
318 
319 static int __init
320 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
321 {
322         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
323 
324         lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
325 
326         if (BAD_MADT_ENTRY(lapic_nmi, end))
327                 return -EINVAL;
328 
329         acpi_table_print_madt_entry(header);
330 
331         if (lapic_nmi->lint != 1)
332                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
333 
334         return 0;
335 }
336 
337 #endif                          /*CONFIG_X86_LOCAL_APIC */
338 
339 #ifdef CONFIG_X86_IO_APIC
340 #define MP_ISA_BUS              0
341 
342 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
343                                           u32 gsi)
344 {
345         int ioapic;
346         int pin;
347         struct mpc_intsrc mp_irq;
348 
349         /*
350          * Check bus_irq boundary.
351          */
352         if (bus_irq >= NR_IRQS_LEGACY) {
353                 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
354                 return;
355         }
356 
357         /*
358          * Convert 'gsi' to 'ioapic.pin'.
359          */
360         ioapic = mp_find_ioapic(gsi);
361         if (ioapic < 0)
362                 return;
363         pin = mp_find_ioapic_pin(ioapic, gsi);
364 
365         /*
366          * TBD: This check is for faulty timer entries, where the override
367          *      erroneously sets the trigger to level, resulting in a HUGE
368          *      increase of timer interrupts!
369          */
370         if ((bus_irq == 0) && (trigger == 3))
371                 trigger = 1;
372 
373         mp_irq.type = MP_INTSRC;
374         mp_irq.irqtype = mp_INT;
375         mp_irq.irqflag = (trigger << 2) | polarity;
376         mp_irq.srcbus = MP_ISA_BUS;
377         mp_irq.srcbusirq = bus_irq;     /* IRQ */
378         mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
379         mp_irq.dstirq = pin;    /* INTIN# */
380 
381         mp_save_irq(&mp_irq);
382 
383         /*
384          * Reset default identity mapping if gsi is also an legacy IRQ,
385          * otherwise there will be more than one entry with the same GSI
386          * and acpi_isa_irq_to_gsi() may give wrong result.
387          */
388         if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
389                 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
390         isa_irq_to_gsi[bus_irq] = gsi;
391 }
392 
393 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
394                         int polarity)
395 {
396 #ifdef CONFIG_X86_MPPARSE
397         struct mpc_intsrc mp_irq;
398         struct pci_dev *pdev;
399         unsigned char number;
400         unsigned int devfn;
401         int ioapic;
402         u8 pin;
403 
404         if (!acpi_ioapic)
405                 return 0;
406         if (!dev || !dev_is_pci(dev))
407                 return 0;
408 
409         pdev = to_pci_dev(dev);
410         number = pdev->bus->number;
411         devfn = pdev->devfn;
412         pin = pdev->pin;
413         /* print the entry should happen on mptable identically */
414         mp_irq.type = MP_INTSRC;
415         mp_irq.irqtype = mp_INT;
416         mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
417                                 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
418         mp_irq.srcbus = number;
419         mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
420         ioapic = mp_find_ioapic(gsi);
421         mp_irq.dstapic = mpc_ioapic_id(ioapic);
422         mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
423 
424         mp_save_irq(&mp_irq);
425 #endif
426         return 0;
427 }
428 
429 static int __init
430 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
431 {
432         struct acpi_madt_io_apic *ioapic = NULL;
433         struct ioapic_domain_cfg cfg = {
434                 .type = IOAPIC_DOMAIN_DYNAMIC,
435                 .ops = &mp_ioapic_irqdomain_ops,
436         };
437 
438         ioapic = (struct acpi_madt_io_apic *)header;
439 
440         if (BAD_MADT_ENTRY(ioapic, end))
441                 return -EINVAL;
442 
443         acpi_table_print_madt_entry(header);
444 
445         /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
446         if (ioapic->global_irq_base < nr_legacy_irqs())
447                 cfg.type = IOAPIC_DOMAIN_LEGACY;
448 
449         mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
450                            &cfg);
451 
452         return 0;
453 }
454 
455 /*
456  * Parse Interrupt Source Override for the ACPI SCI
457  */
458 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
459 {
460         if (trigger == 0)       /* compatible SCI trigger is level */
461                 trigger = 3;
462 
463         if (polarity == 0)      /* compatible SCI polarity is low */
464                 polarity = 3;
465 
466         /* Command-line over-ride via acpi_sci= */
467         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
468                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
469 
470         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
471                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
472 
473         mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
474         acpi_penalize_sci_irq(bus_irq, trigger, polarity);
475 
476         /*
477          * stash over-ride to indicate we've been here
478          * and for later update of acpi_gbl_FADT
479          */
480         acpi_sci_override_gsi = gsi;
481         return;
482 }
483 
484 static int __init
485 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
486                        const unsigned long end)
487 {
488         struct acpi_madt_interrupt_override *intsrc = NULL;
489 
490         intsrc = (struct acpi_madt_interrupt_override *)header;
491 
492         if (BAD_MADT_ENTRY(intsrc, end))
493                 return -EINVAL;
494 
495         acpi_table_print_madt_entry(header);
496 
497         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
498                 acpi_sci_ioapic_setup(intsrc->source_irq,
499                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
500                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
501                                       intsrc->global_irq);
502                 return 0;
503         }
504 
505         if (intsrc->source_irq == 0) {
506                 if (acpi_skip_timer_override) {
507                         printk(PREFIX "BIOS IRQ0 override ignored.\n");
508                         return 0;
509                 }
510 
511                 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
512                         && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
513                         intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
514                         printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
515                 }
516         }
517 
518         mp_override_legacy_irq(intsrc->source_irq,
519                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
520                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
521                                 intsrc->global_irq);
522 
523         return 0;
524 }
525 
526 static int __init
527 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
528 {
529         struct acpi_madt_nmi_source *nmi_src = NULL;
530 
531         nmi_src = (struct acpi_madt_nmi_source *)header;
532 
533         if (BAD_MADT_ENTRY(nmi_src, end))
534                 return -EINVAL;
535 
536         acpi_table_print_madt_entry(header);
537 
538         /* TBD: Support nimsrc entries? */
539 
540         return 0;
541 }
542 
543 #endif                          /* CONFIG_X86_IO_APIC */
544 
545 /*
546  * acpi_pic_sci_set_trigger()
547  *
548  * use ELCR to set PIC-mode trigger type for SCI
549  *
550  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
551  * it may require Edge Trigger -- use "acpi_sci=edge"
552  *
553  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
554  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
555  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
556  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
557  */
558 
559 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
560 {
561         unsigned int mask = 1 << irq;
562         unsigned int old, new;
563 
564         /* Real old ELCR mask */
565         old = inb(0x4d0) | (inb(0x4d1) << 8);
566 
567         /*
568          * If we use ACPI to set PCI IRQs, then we should clear ELCR
569          * since we will set it correctly as we enable the PCI irq
570          * routing.
571          */
572         new = acpi_noirq ? old : 0;
573 
574         /*
575          * Update SCI information in the ELCR, it isn't in the PCI
576          * routing tables..
577          */
578         switch (trigger) {
579         case 1:         /* Edge - clear */
580                 new &= ~mask;
581                 break;
582         case 3:         /* Level - set */
583                 new |= mask;
584                 break;
585         }
586 
587         if (old == new)
588                 return;
589 
590         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
591         outb(new, 0x4d0);
592         outb(new >> 8, 0x4d1);
593 }
594 
595 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
596 {
597         int rc, irq, trigger, polarity;
598 
599         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
600                 *irqp = gsi;
601                 return 0;
602         }
603 
604         rc = acpi_get_override_irq(gsi, &trigger, &polarity);
605         if (rc == 0) {
606                 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
607                 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
608                 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
609                 if (irq >= 0) {
610                         *irqp = irq;
611                         return 0;
612                 }
613         }
614 
615         return -1;
616 }
617 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
618 
619 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
620 {
621         if (isa_irq < nr_legacy_irqs() &&
622             isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
623                 *gsi = isa_irq_to_gsi[isa_irq];
624                 return 0;
625         }
626 
627         return -1;
628 }
629 
630 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
631                                  int trigger, int polarity)
632 {
633 #ifdef CONFIG_PCI
634         /*
635          * Make sure all (legacy) PCI IRQs are set as level-triggered.
636          */
637         if (trigger == ACPI_LEVEL_SENSITIVE)
638                 elcr_set_level_irq(gsi);
639 #endif
640 
641         return gsi;
642 }
643 
644 #ifdef CONFIG_X86_LOCAL_APIC
645 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
646                                     int trigger, int polarity)
647 {
648         int irq = gsi;
649 #ifdef CONFIG_X86_IO_APIC
650         int node;
651         struct irq_alloc_info info;
652 
653         node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
654         trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
655         polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
656         ioapic_set_alloc_attr(&info, node, trigger, polarity);
657 
658         mutex_lock(&acpi_ioapic_lock);
659         irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
660         /* Don't set up the ACPI SCI because it's already set up */
661         if (irq >= 0 && enable_update_mptable &&
662             acpi_gbl_FADT.sci_interrupt != gsi)
663                 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
664         mutex_unlock(&acpi_ioapic_lock);
665 #endif
666 
667         return irq;
668 }
669 
670 static void acpi_unregister_gsi_ioapic(u32 gsi)
671 {
672 #ifdef CONFIG_X86_IO_APIC
673         int irq;
674 
675         mutex_lock(&acpi_ioapic_lock);
676         irq = mp_map_gsi_to_irq(gsi, 0, NULL);
677         if (irq > 0)
678                 mp_unmap_irq(irq);
679         mutex_unlock(&acpi_ioapic_lock);
680 #endif
681 }
682 #endif
683 
684 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
685                            int trigger, int polarity) = acpi_register_gsi_pic;
686 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
687 
688 #ifdef CONFIG_ACPI_SLEEP
689 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
690 #else
691 int (*acpi_suspend_lowlevel)(void);
692 #endif
693 
694 /*
695  * success: return IRQ number (>=0)
696  * failure: return < 0
697  */
698 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
699 {
700         return __acpi_register_gsi(dev, gsi, trigger, polarity);
701 }
702 EXPORT_SYMBOL_GPL(acpi_register_gsi);
703 
704 void acpi_unregister_gsi(u32 gsi)
705 {
706         if (__acpi_unregister_gsi)
707                 __acpi_unregister_gsi(gsi);
708 }
709 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
710 
711 #ifdef CONFIG_X86_LOCAL_APIC
712 static void __init acpi_set_irq_model_ioapic(void)
713 {
714         acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
715         __acpi_register_gsi = acpi_register_gsi_ioapic;
716         __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
717         acpi_ioapic = 1;
718 }
719 #endif
720 
721 /*
722  *  ACPI based hotplug support for CPU
723  */
724 #ifdef CONFIG_ACPI_HOTPLUG_CPU
725 #include <acpi/processor.h>
726 
727 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
728 {
729 #ifdef CONFIG_ACPI_NUMA
730         int nid;
731 
732         nid = acpi_get_node(handle);
733         if (nid != NUMA_NO_NODE) {
734                 set_apicid_to_node(physid, nid);
735                 numa_set_node(cpu, nid);
736         }
737 #endif
738         return 0;
739 }
740 
741 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
742                  int *pcpu)
743 {
744         int cpu;
745 
746         cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
747         if (cpu < 0) {
748                 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
749                 return cpu;
750         }
751 
752         acpi_processor_set_pdc(handle);
753         acpi_map_cpu2node(handle, cpu, physid);
754 
755         *pcpu = cpu;
756         return 0;
757 }
758 EXPORT_SYMBOL(acpi_map_cpu);
759 
760 int acpi_unmap_cpu(int cpu)
761 {
762 #ifdef CONFIG_ACPI_NUMA
763         set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
764 #endif
765 
766         per_cpu(x86_cpu_to_apicid, cpu) = -1;
767         set_cpu_present(cpu, false);
768         num_processors--;
769 
770         return (0);
771 }
772 EXPORT_SYMBOL(acpi_unmap_cpu);
773 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
774 
775 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
776 {
777         int ret = -ENOSYS;
778 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
779         int ioapic_id;
780         u64 addr;
781         struct ioapic_domain_cfg cfg = {
782                 .type = IOAPIC_DOMAIN_DYNAMIC,
783                 .ops = &mp_ioapic_irqdomain_ops,
784         };
785 
786         ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
787         if (ioapic_id < 0) {
788                 unsigned long long uid;
789                 acpi_status status;
790 
791                 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
792                                                NULL, &uid);
793                 if (ACPI_FAILURE(status)) {
794                         acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
795                         return -EINVAL;
796                 }
797                 ioapic_id = (int)uid;
798         }
799 
800         mutex_lock(&acpi_ioapic_lock);
801         ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
802         mutex_unlock(&acpi_ioapic_lock);
803 #endif
804 
805         return ret;
806 }
807 EXPORT_SYMBOL(acpi_register_ioapic);
808 
809 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
810 {
811         int ret = -ENOSYS;
812 
813 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
814         mutex_lock(&acpi_ioapic_lock);
815         ret  = mp_unregister_ioapic(gsi_base);
816         mutex_unlock(&acpi_ioapic_lock);
817 #endif
818 
819         return ret;
820 }
821 EXPORT_SYMBOL(acpi_unregister_ioapic);
822 
823 /**
824  * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
825  *                          has been registered
826  * @handle:     ACPI handle of the IOAPIC deivce
827  * @gsi_base:   GSI base associated with the IOAPIC
828  *
829  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
830  * with acpi_register_ioapic()/acpi_unregister_ioapic().
831  */
832 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
833 {
834         int ret = 0;
835 
836 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
837         mutex_lock(&acpi_ioapic_lock);
838         ret  = mp_ioapic_registered(gsi_base);
839         mutex_unlock(&acpi_ioapic_lock);
840 #endif
841 
842         return ret;
843 }
844 
845 static int __init acpi_parse_sbf(struct acpi_table_header *table)
846 {
847         struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
848 
849         sbf_port = sb->cmos_index;      /* Save CMOS port */
850 
851         return 0;
852 }
853 
854 #ifdef CONFIG_HPET_TIMER
855 #include <asm/hpet.h>
856 
857 static struct resource *hpet_res __initdata;
858 
859 static int __init acpi_parse_hpet(struct acpi_table_header *table)
860 {
861         struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
862 
863         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
864                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
865                        "memory.\n");
866                 return -1;
867         }
868 
869         hpet_address = hpet_tbl->address.address;
870         hpet_blockid = hpet_tbl->sequence;
871 
872         /*
873          * Some broken BIOSes advertise HPET at 0x0. We really do not
874          * want to allocate a resource there.
875          */
876         if (!hpet_address) {
877                 printk(KERN_WARNING PREFIX
878                        "HPET id: %#x base: %#lx is invalid\n",
879                        hpet_tbl->id, hpet_address);
880                 return 0;
881         }
882 #ifdef CONFIG_X86_64
883         /*
884          * Some even more broken BIOSes advertise HPET at
885          * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
886          * some noise:
887          */
888         if (hpet_address == 0xfed0000000000000UL) {
889                 if (!hpet_force_user) {
890                         printk(KERN_WARNING PREFIX "HPET id: %#x "
891                                "base: 0xfed0000000000000 is bogus\n "
892                                "try hpet=force on the kernel command line to "
893                                "fix it up to 0xfed00000.\n", hpet_tbl->id);
894                         hpet_address = 0;
895                         return 0;
896                 }
897                 printk(KERN_WARNING PREFIX
898                        "HPET id: %#x base: 0xfed0000000000000 fixed up "
899                        "to 0xfed00000.\n", hpet_tbl->id);
900                 hpet_address >>= 32;
901         }
902 #endif
903         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
904                hpet_tbl->id, hpet_address);
905 
906         /*
907          * Allocate and initialize the HPET firmware resource for adding into
908          * the resource tree during the lateinit timeframe.
909          */
910 #define HPET_RESOURCE_NAME_SIZE 9
911         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
912 
913         hpet_res->name = (void *)&hpet_res[1];
914         hpet_res->flags = IORESOURCE_MEM;
915         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
916                  hpet_tbl->sequence);
917 
918         hpet_res->start = hpet_address;
919         hpet_res->end = hpet_address + (1 * 1024) - 1;
920 
921         return 0;
922 }
923 
924 /*
925  * hpet_insert_resource inserts the HPET resources used into the resource
926  * tree.
927  */
928 static __init int hpet_insert_resource(void)
929 {
930         if (!hpet_res)
931                 return 1;
932 
933         return insert_resource(&iomem_resource, hpet_res);
934 }
935 
936 late_initcall(hpet_insert_resource);
937 
938 #else
939 #define acpi_parse_hpet NULL
940 #endif
941 
942 static int __init acpi_parse_fadt(struct acpi_table_header *table)
943 {
944         if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
945                 pr_debug("ACPI: no legacy devices present\n");
946                 x86_platform.legacy.devices.pnpbios = 0;
947         }
948 
949         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
950             !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
951             x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
952                 pr_debug("ACPI: i8042 controller is absent\n");
953                 x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
954         }
955 
956         if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
957                 pr_debug("ACPI: not registering RTC platform device\n");
958                 x86_platform.legacy.rtc = 0;
959         }
960 
961 #ifdef CONFIG_X86_PM_TIMER
962         /* detect the location of the ACPI PM Timer */
963         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
964                 /* FADT rev. 2 */
965                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
966                     ACPI_ADR_SPACE_SYSTEM_IO)
967                         return 0;
968 
969                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
970                 /*
971                  * "X" fields are optional extensions to the original V1.0
972                  * fields, so we must selectively expand V1.0 fields if the
973                  * corresponding X field is zero.
974                  */
975                 if (!pmtmr_ioport)
976                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
977         } else {
978                 /* FADT rev. 1 */
979                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
980         }
981         if (pmtmr_ioport)
982                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
983                        pmtmr_ioport);
984 #endif
985         return 0;
986 }
987 
988 #ifdef  CONFIG_X86_LOCAL_APIC
989 /*
990  * Parse LAPIC entries in MADT
991  * returns 0 on success, < 0 on error
992  */
993 
994 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
995 {
996         int count;
997 
998         if (!boot_cpu_has(X86_FEATURE_APIC))
999                 return -ENODEV;
1000 
1001         /*
1002          * Note that the LAPIC address is obtained from the MADT (32-bit value)
1003          * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1004          */
1005 
1006         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1007                                       acpi_parse_lapic_addr_ovr, 0);
1008         if (count < 0) {
1009                 printk(KERN_ERR PREFIX
1010                        "Error parsing LAPIC address override entry\n");
1011                 return count;
1012         }
1013 
1014         register_lapic_address(acpi_lapic_addr);
1015 
1016         return count;
1017 }
1018 
1019 static int __init acpi_parse_madt_lapic_entries(void)
1020 {
1021         int count;
1022         int x2count = 0;
1023         int ret;
1024         struct acpi_subtable_proc madt_proc[2];
1025 
1026         if (!boot_cpu_has(X86_FEATURE_APIC))
1027                 return -ENODEV;
1028 
1029         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1030                                       acpi_parse_sapic, MAX_LOCAL_APIC);
1031 
1032         if (!count) {
1033                 memset(madt_proc, 0, sizeof(madt_proc));
1034                 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1035                 madt_proc[0].handler = acpi_parse_lapic;
1036                 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1037                 madt_proc[1].handler = acpi_parse_x2apic;
1038                 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1039                                 sizeof(struct acpi_table_madt),
1040                                 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1041                 if (ret < 0) {
1042                         printk(KERN_ERR PREFIX
1043                                         "Error parsing LAPIC/X2APIC entries\n");
1044                         return ret;
1045                 }
1046 
1047                 count = madt_proc[0].count;
1048                 x2count = madt_proc[1].count;
1049         }
1050         if (!count && !x2count) {
1051                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1052                 /* TBD: Cleanup to allow fallback to MPS */
1053                 return -ENODEV;
1054         } else if (count < 0 || x2count < 0) {
1055                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1056                 /* TBD: Cleanup to allow fallback to MPS */
1057                 return count;
1058         }
1059 
1060         x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1061                                         acpi_parse_x2apic_nmi, 0);
1062         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1063                                       acpi_parse_lapic_nmi, 0);
1064         if (count < 0 || x2count < 0) {
1065                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1066                 /* TBD: Cleanup to allow fallback to MPS */
1067                 return count;
1068         }
1069         return 0;
1070 }
1071 #endif                          /* CONFIG_X86_LOCAL_APIC */
1072 
1073 #ifdef  CONFIG_X86_IO_APIC
1074 static void __init mp_config_acpi_legacy_irqs(void)
1075 {
1076         int i;
1077         struct mpc_intsrc mp_irq;
1078 
1079 #ifdef CONFIG_EISA
1080         /*
1081          * Fabricate the legacy ISA bus (bus #31).
1082          */
1083         mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1084 #endif
1085         set_bit(MP_ISA_BUS, mp_bus_not_pci);
1086         pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1087 
1088         /*
1089          * Use the default configuration for the IRQs 0-15.  Unless
1090          * overridden by (MADT) interrupt source override entries.
1091          */
1092         for (i = 0; i < nr_legacy_irqs(); i++) {
1093                 int ioapic, pin;
1094                 unsigned int dstapic;
1095                 int idx;
1096                 u32 gsi;
1097 
1098                 /* Locate the gsi that irq i maps to. */
1099                 if (acpi_isa_irq_to_gsi(i, &gsi))
1100                         continue;
1101 
1102                 /*
1103                  * Locate the IOAPIC that manages the ISA IRQ.
1104                  */
1105                 ioapic = mp_find_ioapic(gsi);
1106                 if (ioapic < 0)
1107                         continue;
1108                 pin = mp_find_ioapic_pin(ioapic, gsi);
1109                 dstapic = mpc_ioapic_id(ioapic);
1110 
1111                 for (idx = 0; idx < mp_irq_entries; idx++) {
1112                         struct mpc_intsrc *irq = mp_irqs + idx;
1113 
1114                         /* Do we already have a mapping for this ISA IRQ? */
1115                         if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1116                                 break;
1117 
1118                         /* Do we already have a mapping for this IOAPIC pin */
1119                         if (irq->dstapic == dstapic && irq->dstirq == pin)
1120                                 break;
1121                 }
1122 
1123                 if (idx != mp_irq_entries) {
1124                         printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1125                         continue;       /* IRQ already used */
1126                 }
1127 
1128                 mp_irq.type = MP_INTSRC;
1129                 mp_irq.irqflag = 0;     /* Conforming */
1130                 mp_irq.srcbus = MP_ISA_BUS;
1131                 mp_irq.dstapic = dstapic;
1132                 mp_irq.irqtype = mp_INT;
1133                 mp_irq.srcbusirq = i; /* Identity mapped */
1134                 mp_irq.dstirq = pin;
1135 
1136                 mp_save_irq(&mp_irq);
1137         }
1138 }
1139 
1140 /*
1141  * Parse IOAPIC related entries in MADT
1142  * returns 0 on success, < 0 on error
1143  */
1144 static int __init acpi_parse_madt_ioapic_entries(void)
1145 {
1146         int count;
1147 
1148         /*
1149          * ACPI interpreter is required to complete interrupt setup,
1150          * so if it is off, don't enumerate the io-apics with ACPI.
1151          * If MPS is present, it will handle them,
1152          * otherwise the system will stay in PIC mode
1153          */
1154         if (acpi_disabled || acpi_noirq)
1155                 return -ENODEV;
1156 
1157         if (!boot_cpu_has(X86_FEATURE_APIC))
1158                 return -ENODEV;
1159 
1160         /*
1161          * if "noapic" boot option, don't look for IO-APICs
1162          */
1163         if (skip_ioapic_setup) {
1164                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1165                        "due to 'noapic' option.\n");
1166                 return -ENODEV;
1167         }
1168 
1169         count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1170                                       MAX_IO_APICS);
1171         if (!count) {
1172                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1173                 return -ENODEV;
1174         } else if (count < 0) {
1175                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1176                 return count;
1177         }
1178 
1179         count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1180                                       acpi_parse_int_src_ovr, nr_irqs);
1181         if (count < 0) {
1182                 printk(KERN_ERR PREFIX
1183                        "Error parsing interrupt source overrides entry\n");
1184                 /* TBD: Cleanup to allow fallback to MPS */
1185                 return count;
1186         }
1187 
1188         /*
1189          * If BIOS did not supply an INT_SRC_OVR for the SCI
1190          * pretend we got one so we can set the SCI flags.
1191          */
1192         if (!acpi_sci_override_gsi)
1193                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1194                                       acpi_gbl_FADT.sci_interrupt);
1195 
1196         /* Fill in identity legacy mappings where no override */
1197         mp_config_acpi_legacy_irqs();
1198 
1199         count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1200                                       acpi_parse_nmi_src, nr_irqs);
1201         if (count < 0) {
1202                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1203                 /* TBD: Cleanup to allow fallback to MPS */
1204                 return count;
1205         }
1206 
1207         return 0;
1208 }
1209 #else
1210 static inline int acpi_parse_madt_ioapic_entries(void)
1211 {
1212         return -1;
1213 }
1214 #endif  /* !CONFIG_X86_IO_APIC */
1215 
1216 static void __init early_acpi_process_madt(void)
1217 {
1218 #ifdef CONFIG_X86_LOCAL_APIC
1219         int error;
1220 
1221         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1222 
1223                 /*
1224                  * Parse MADT LAPIC entries
1225                  */
1226                 error = early_acpi_parse_madt_lapic_addr_ovr();
1227                 if (!error) {
1228                         acpi_lapic = 1;
1229                         smp_found_config = 1;
1230                 }
1231                 if (error == -EINVAL) {
1232                         /*
1233                          * Dell Precision Workstation 410, 610 come here.
1234                          */
1235                         printk(KERN_ERR PREFIX
1236                                "Invalid BIOS MADT, disabling ACPI\n");
1237                         disable_acpi();
1238                 }
1239         }
1240 #endif
1241 }
1242 
1243 static void __init acpi_process_madt(void)
1244 {
1245 #ifdef CONFIG_X86_LOCAL_APIC
1246         int error;
1247 
1248         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1249 
1250                 /*
1251                  * Parse MADT LAPIC entries
1252                  */
1253                 error = acpi_parse_madt_lapic_entries();
1254                 if (!error) {
1255                         acpi_lapic = 1;
1256 
1257                         /*
1258                          * Parse MADT IO-APIC entries
1259                          */
1260                         mutex_lock(&acpi_ioapic_lock);
1261                         error = acpi_parse_madt_ioapic_entries();
1262                         mutex_unlock(&acpi_ioapic_lock);
1263                         if (!error) {
1264                                 acpi_set_irq_model_ioapic();
1265 
1266                                 smp_found_config = 1;
1267                         }
1268                 }
1269                 if (error == -EINVAL) {
1270                         /*
1271                          * Dell Precision Workstation 410, 610 come here.
1272                          */
1273                         printk(KERN_ERR PREFIX
1274                                "Invalid BIOS MADT, disabling ACPI\n");
1275                         disable_acpi();
1276                 }
1277         } else {
1278                 /*
1279                  * ACPI found no MADT, and so ACPI wants UP PIC mode.
1280                  * In the event an MPS table was found, forget it.
1281                  * Boot with "acpi=off" to use MPS on such a system.
1282                  */
1283                 if (smp_found_config) {
1284                         printk(KERN_WARNING PREFIX
1285                                 "No APIC-table, disabling MPS\n");
1286                         smp_found_config = 0;
1287                 }
1288         }
1289 
1290         /*
1291          * ACPI supports both logical (e.g. Hyper-Threading) and physical
1292          * processors, where MPS only supports physical.
1293          */
1294         if (acpi_lapic && acpi_ioapic)
1295                 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1296                        "information\n");
1297         else if (acpi_lapic)
1298                 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1299                        "configuration information\n");
1300 #endif
1301         return;
1302 }
1303 
1304 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1305 {
1306         if (!acpi_force) {
1307                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1308                        d->ident);
1309                 acpi_noirq_set();
1310         }
1311         return 0;
1312 }
1313 
1314 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1315 {
1316         if (!acpi_force) {
1317                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1318                        d->ident);
1319                 acpi_disable_pci();
1320         }
1321         return 0;
1322 }
1323 
1324 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1325 {
1326         if (!acpi_force) {
1327                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1328                 disable_acpi();
1329         } else {
1330                 printk(KERN_NOTICE
1331                        "Warning: DMI blacklist says broken, but acpi forced\n");
1332         }
1333         return 0;
1334 }
1335 
1336 /*
1337  * Force ignoring BIOS IRQ0 override
1338  */
1339 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1340 {
1341         if (!acpi_skip_timer_override) {
1342                 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1343                         d->ident);
1344                 acpi_skip_timer_override = 1;
1345         }
1346         return 0;
1347 }
1348 
1349 /*
1350  * ACPI offers an alternative platform interface model that removes
1351  * ACPI hardware requirements for platforms that do not implement
1352  * the PC Architecture.
1353  *
1354  * We initialize the Hardware-reduced ACPI model here:
1355  */
1356 static void __init acpi_reduced_hw_init(void)
1357 {
1358         if (acpi_gbl_reduced_hardware) {
1359                 /*
1360                  * Override x86_init functions and bypass legacy pic
1361                  * in Hardware-reduced ACPI mode
1362                  */
1363                 x86_init.timers.timer_init      = x86_init_noop;
1364                 x86_init.irqs.pre_vector_init   = x86_init_noop;
1365                 legacy_pic                      = &null_legacy_pic;
1366         }
1367 }
1368 
1369 /*
1370  * If your system is blacklisted here, but you find that acpi=force
1371  * works for you, please contact linux-acpi@vger.kernel.org
1372  */
1373 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1374         /*
1375          * Boxes that need ACPI disabled
1376          */
1377         {
1378          .callback = dmi_disable_acpi,
1379          .ident = "IBM Thinkpad",
1380          .matches = {
1381                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1382                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1383                      },
1384          },
1385 
1386         /*
1387          * Boxes that need ACPI PCI IRQ routing disabled
1388          */
1389         {
1390          .callback = disable_acpi_irq,
1391          .ident = "ASUS A7V",
1392          .matches = {
1393                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1394                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1395                      /* newer BIOS, Revision 1011, does work */
1396                      DMI_MATCH(DMI_BIOS_VERSION,
1397                                "ASUS A7V ACPI BIOS Revision 1007"),
1398                      },
1399          },
1400         {
1401                 /*
1402                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1403                  * for LPC bridge, which is needed for the PCI
1404                  * interrupt links to work. DSDT fix is in bug 5966.
1405                  * 2645, 2646 model numbers are shared with 600/600E/600X
1406                  */
1407          .callback = disable_acpi_irq,
1408          .ident = "IBM Thinkpad 600 Series 2645",
1409          .matches = {
1410                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1411                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1412                      },
1413          },
1414         {
1415          .callback = disable_acpi_irq,
1416          .ident = "IBM Thinkpad 600 Series 2646",
1417          .matches = {
1418                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1419                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1420                      },
1421          },
1422         /*
1423          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1424          */
1425         {                       /* _BBN 0 bug */
1426          .callback = disable_acpi_pci,
1427          .ident = "ASUS PR-DLS",
1428          .matches = {
1429                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1430                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1431                      DMI_MATCH(DMI_BIOS_VERSION,
1432                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1433                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1434                      },
1435          },
1436         {
1437          .callback = disable_acpi_pci,
1438          .ident = "Acer TravelMate 36x Laptop",
1439          .matches = {
1440                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1441                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1442                      },
1443          },
1444         {}
1445 };
1446 
1447 /* second table for DMI checks that should run after early-quirks */
1448 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1449         /*
1450          * HP laptops which use a DSDT reporting as HP/SB400/10000,
1451          * which includes some code which overrides all temperature
1452          * trip points to 16C if the INTIN2 input of the I/O APIC
1453          * is enabled.  This input is incorrectly designated the
1454          * ISA IRQ 0 via an interrupt source override even though
1455          * it is wired to the output of the master 8259A and INTIN0
1456          * is not connected at all.  Force ignoring BIOS IRQ0
1457          * override in that cases.
1458          */
1459         {
1460          .callback = dmi_ignore_irq0_timer_override,
1461          .ident = "HP nx6115 laptop",
1462          .matches = {
1463                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1464                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1465                      },
1466          },
1467         {
1468          .callback = dmi_ignore_irq0_timer_override,
1469          .ident = "HP NX6125 laptop",
1470          .matches = {
1471                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1472                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1473                      },
1474          },
1475         {
1476          .callback = dmi_ignore_irq0_timer_override,
1477          .ident = "HP NX6325 laptop",
1478          .matches = {
1479                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1480                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1481                      },
1482          },
1483         {
1484          .callback = dmi_ignore_irq0_timer_override,
1485          .ident = "HP 6715b laptop",
1486          .matches = {
1487                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1488                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1489                      },
1490          },
1491         {
1492          .callback = dmi_ignore_irq0_timer_override,
1493          .ident = "FUJITSU SIEMENS",
1494          .matches = {
1495                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1496                      DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1497                      },
1498          },
1499         {}
1500 };
1501 
1502 /*
1503  * acpi_boot_table_init() and acpi_boot_init()
1504  *  called from setup_arch(), always.
1505  *      1. checksums all tables
1506  *      2. enumerates lapics
1507  *      3. enumerates io-apics
1508  *
1509  * acpi_table_init() is separate to allow reading SRAT without
1510  * other side effects.
1511  *
1512  * side effects of acpi_boot_init:
1513  *      acpi_lapic = 1 if LAPIC found
1514  *      acpi_ioapic = 1 if IOAPIC found
1515  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1516  *      if acpi_blacklisted() acpi_disabled = 1;
1517  *      acpi_irq_model=...
1518  *      ...
1519  */
1520 
1521 void __init acpi_boot_table_init(void)
1522 {
1523         dmi_check_system(acpi_dmi_table);
1524 
1525         /*
1526          * If acpi_disabled, bail out
1527          */
1528         if (acpi_disabled)
1529                 return;
1530 
1531         /*
1532          * Initialize the ACPI boot-time table parser.
1533          */
1534         if (acpi_table_init()) {
1535                 disable_acpi();
1536                 return;
1537         }
1538 
1539         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1540 
1541         /*
1542          * blacklist may disable ACPI entirely
1543          */
1544         if (acpi_blacklisted()) {
1545                 if (acpi_force) {
1546                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1547                 } else {
1548                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1549                         disable_acpi();
1550                         return;
1551                 }
1552         }
1553 }
1554 
1555 int __init early_acpi_boot_init(void)
1556 {
1557         /*
1558          * If acpi_disabled, bail out
1559          */
1560         if (acpi_disabled)
1561                 return 1;
1562 
1563         /*
1564          * Process the Multiple APIC Description Table (MADT), if present
1565          */
1566         early_acpi_process_madt();
1567 
1568         /*
1569          * Hardware-reduced ACPI mode initialization:
1570          */
1571         acpi_reduced_hw_init();
1572 
1573         return 0;
1574 }
1575 
1576 int __init acpi_boot_init(void)
1577 {
1578         /* those are executed after early-quirks are executed */
1579         dmi_check_system(acpi_dmi_table_late);
1580 
1581         /*
1582          * If acpi_disabled, bail out
1583          */
1584         if (acpi_disabled)
1585                 return 1;
1586 
1587         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1588 
1589         /*
1590          * set sci_int and PM timer address
1591          */
1592         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1593 
1594         /*
1595          * Process the Multiple APIC Description Table (MADT), if present
1596          */
1597         acpi_process_madt();
1598 
1599         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1600         if (IS_ENABLED(CONFIG_ACPI_BGRT))
1601                 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1602 
1603         if (!acpi_noirq)
1604                 x86_init.pci.init = pci_acpi_init;
1605 
1606         return 0;
1607 }
1608 
1609 static int __init parse_acpi(char *arg)
1610 {
1611         if (!arg)
1612                 return -EINVAL;
1613 
1614         /* "acpi=off" disables both ACPI table parsing and interpreter */
1615         if (strcmp(arg, "off") == 0) {
1616                 disable_acpi();
1617         }
1618         /* acpi=force to over-ride black-list */
1619         else if (strcmp(arg, "force") == 0) {
1620                 acpi_force = 1;
1621                 acpi_disabled = 0;
1622         }
1623         /* acpi=strict disables out-of-spec workarounds */
1624         else if (strcmp(arg, "strict") == 0) {
1625                 acpi_strict = 1;
1626         }
1627         /* acpi=rsdt use RSDT instead of XSDT */
1628         else if (strcmp(arg, "rsdt") == 0) {
1629                 acpi_gbl_do_not_use_xsdt = TRUE;
1630         }
1631         /* "acpi=noirq" disables ACPI interrupt routing */
1632         else if (strcmp(arg, "noirq") == 0) {
1633                 acpi_noirq_set();
1634         }
1635         /* "acpi=copy_dsdt" copys DSDT */
1636         else if (strcmp(arg, "copy_dsdt") == 0) {
1637                 acpi_gbl_copy_dsdt_locally = 1;
1638         }
1639         /* "acpi=nocmcff" disables FF mode for corrected errors */
1640         else if (strcmp(arg, "nocmcff") == 0) {
1641                 acpi_disable_cmcff = 1;
1642         } else {
1643                 /* Core will printk when we return error. */
1644                 return -EINVAL;
1645         }
1646         return 0;
1647 }
1648 early_param("acpi", parse_acpi);
1649 
1650 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1651 static int __init parse_pci(char *arg)
1652 {
1653         if (arg && strcmp(arg, "noacpi") == 0)
1654                 acpi_disable_pci();
1655         return 0;
1656 }
1657 early_param("pci", parse_pci);
1658 
1659 int __init acpi_mps_check(void)
1660 {
1661 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1662 /* mptable code is not built-in*/
1663         if (acpi_disabled || acpi_noirq) {
1664                 printk(KERN_WARNING "MPS support code is not built-in.\n"
1665                        "Using acpi=off or acpi=noirq or pci=noacpi "
1666                        "may have problem\n");
1667                 return 1;
1668         }
1669 #endif
1670         return 0;
1671 }
1672 
1673 #ifdef CONFIG_X86_IO_APIC
1674 static int __init parse_acpi_skip_timer_override(char *arg)
1675 {
1676         acpi_skip_timer_override = 1;
1677         return 0;
1678 }
1679 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1680 
1681 static int __init parse_acpi_use_timer_override(char *arg)
1682 {
1683         acpi_use_timer_override = 1;
1684         return 0;
1685 }
1686 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1687 #endif /* CONFIG_X86_IO_APIC */
1688 
1689 static int __init setup_acpi_sci(char *s)
1690 {
1691         if (!s)
1692                 return -EINVAL;
1693         if (!strcmp(s, "edge"))
1694                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1695                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1696         else if (!strcmp(s, "level"))
1697                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1698                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1699         else if (!strcmp(s, "high"))
1700                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1701                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1702         else if (!strcmp(s, "low"))
1703                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1704                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1705         else
1706                 return -EINVAL;
1707         return 0;
1708 }
1709 early_param("acpi_sci", setup_acpi_sci);
1710 
1711 int __acpi_acquire_global_lock(unsigned int *lock)
1712 {
1713         unsigned int old, new, val;
1714         do {
1715                 old = *lock;
1716                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1717                 val = cmpxchg(lock, old, new);
1718         } while (unlikely (val != old));
1719         return (new < 3) ? -1 : 0;
1720 }
1721 
1722 int __acpi_release_global_lock(unsigned int *lock)
1723 {
1724         unsigned int old, new, val;
1725         do {
1726                 old = *lock;
1727                 new = old & ~0x3;
1728                 val = cmpxchg(lock, old, new);
1729         } while (unlikely (val != old));
1730         return old & 0x1;
1731 }
1732 
1733 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1734 {
1735         e820__range_add(addr, size, E820_TYPE_ACPI);
1736         e820__update_table_print();
1737 }
1738 

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