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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/module.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 
 39 #include <asm/irqdomain.h>
 40 #include <asm/pci_x86.h>
 41 #include <asm/pgtable.h>
 42 #include <asm/io_apic.h>
 43 #include <asm/apic.h>
 44 #include <asm/io.h>
 45 #include <asm/mpspec.h>
 46 #include <asm/smp.h>
 47 #include <asm/i8259.h>
 48 
 49 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
 50 static int __initdata acpi_force = 0;
 51 int acpi_disabled;
 52 EXPORT_SYMBOL(acpi_disabled);
 53 
 54 #ifdef  CONFIG_X86_64
 55 # include <asm/proto.h>
 56 #endif                          /* X86 */
 57 
 58 #define PREFIX                  "ACPI: "
 59 
 60 int acpi_noirq;                         /* skip ACPI IRQ initialization */
 61 int acpi_pci_disabled;          /* skip ACPI PCI scan and IRQ initialization */
 62 EXPORT_SYMBOL(acpi_pci_disabled);
 63 
 64 int acpi_lapic;
 65 int acpi_ioapic;
 66 int acpi_strict;
 67 int acpi_disable_cmcff;
 68 
 69 u8 acpi_sci_flags __initdata;
 70 int acpi_sci_override_gsi __initdata;
 71 int acpi_skip_timer_override __initdata;
 72 int acpi_use_timer_override __initdata;
 73 int acpi_fix_pin2_polarity __initdata;
 74 
 75 #ifdef CONFIG_X86_LOCAL_APIC
 76 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
 77 #endif
 78 
 79 /*
 80  * Locks related to IOAPIC hotplug
 81  * Hotplug side:
 82  *      ->device_hotplug_lock
 83  *              ->acpi_ioapic_lock
 84  *                      ->ioapic_lock
 85  * Interrupt mapping side:
 86  *      ->acpi_ioapic_lock
 87  *              ->ioapic_mutex
 88  *                      ->ioapic_lock
 89  */
 90 static DEFINE_MUTEX(acpi_ioapic_lock);
 91 
 92 /* --------------------------------------------------------------------------
 93                               Boot-time Configuration
 94    -------------------------------------------------------------------------- */
 95 
 96 /*
 97  * The default interrupt routing model is PIC (8259).  This gets
 98  * overridden if IOAPICs are enumerated (below).
 99  */
100 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
101 
102 
103 /*
104  * ISA irqs by default are the first 16 gsis but can be
105  * any gsi as specified by an interrupt source override.
106  */
107 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
108         0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
109 };
110 
111 #define ACPI_INVALID_GSI                INT_MIN
112 
113 /*
114  * This is just a simple wrapper around early_ioremap(),
115  * with sanity checks for phys == 0 and size == 0.
116  */
117 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
118 {
119 
120         if (!phys || !size)
121                 return NULL;
122 
123         return early_ioremap(phys, size);
124 }
125 
126 void __init __acpi_unmap_table(char *map, unsigned long size)
127 {
128         if (!map || !size)
129                 return;
130 
131         early_iounmap(map, size);
132 }
133 
134 #ifdef CONFIG_X86_LOCAL_APIC
135 static int __init acpi_parse_madt(struct acpi_table_header *table)
136 {
137         struct acpi_table_madt *madt = NULL;
138 
139         if (!cpu_has_apic)
140                 return -EINVAL;
141 
142         madt = (struct acpi_table_madt *)table;
143         if (!madt) {
144                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
145                 return -ENODEV;
146         }
147 
148         if (madt->address) {
149                 acpi_lapic_addr = (u64) madt->address;
150 
151                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
152                        madt->address);
153         }
154 
155         default_acpi_madt_oem_check(madt->header.oem_id,
156                                     madt->header.oem_table_id);
157 
158         return 0;
159 }
160 
161 /**
162  * acpi_register_lapic - register a local apic and generates a logic cpu number
163  * @id: local apic id to register
164  * @enabled: this cpu is enabled or not
165  *
166  * Returns the logic cpu number which maps to the local apic
167  */
168 static int acpi_register_lapic(int id, u8 enabled)
169 {
170         unsigned int ver = 0;
171 
172         if (id >= MAX_LOCAL_APIC) {
173                 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
174                 return -EINVAL;
175         }
176 
177         if (!enabled) {
178                 ++disabled_cpus;
179                 return -EINVAL;
180         }
181 
182         if (boot_cpu_physical_apicid != -1U)
183                 ver = apic_version[boot_cpu_physical_apicid];
184 
185         return generic_processor_info(id, ver);
186 }
187 
188 static int __init
189 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
190 {
191         struct acpi_madt_local_x2apic *processor = NULL;
192         int apic_id;
193         u8 enabled;
194 
195         processor = (struct acpi_madt_local_x2apic *)header;
196 
197         if (BAD_MADT_ENTRY(processor, end))
198                 return -EINVAL;
199 
200         acpi_table_print_madt_entry(header);
201 
202         apic_id = processor->local_apic_id;
203         enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
204 #ifdef CONFIG_X86_X2APIC
205         /*
206          * We need to register disabled CPU as well to permit
207          * counting disabled CPUs. This allows us to size
208          * cpus_possible_map more accurately, to permit
209          * to not preallocating memory for all NR_CPUS
210          * when we use CPU hotplug.
211          */
212         if (!apic->apic_id_valid(apic_id) && enabled)
213                 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
214         else
215                 acpi_register_lapic(apic_id, enabled);
216 #else
217         printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
218 #endif
219 
220         return 0;
221 }
222 
223 static int __init
224 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
225 {
226         struct acpi_madt_local_apic *processor = NULL;
227 
228         processor = (struct acpi_madt_local_apic *)header;
229 
230         if (BAD_MADT_ENTRY(processor, end))
231                 return -EINVAL;
232 
233         acpi_table_print_madt_entry(header);
234 
235         /*
236          * We need to register disabled CPU as well to permit
237          * counting disabled CPUs. This allows us to size
238          * cpus_possible_map more accurately, to permit
239          * to not preallocating memory for all NR_CPUS
240          * when we use CPU hotplug.
241          */
242         acpi_register_lapic(processor->id,      /* APIC ID */
243                             processor->lapic_flags & ACPI_MADT_ENABLED);
244 
245         return 0;
246 }
247 
248 static int __init
249 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
250 {
251         struct acpi_madt_local_sapic *processor = NULL;
252 
253         processor = (struct acpi_madt_local_sapic *)header;
254 
255         if (BAD_MADT_ENTRY(processor, end))
256                 return -EINVAL;
257 
258         acpi_table_print_madt_entry(header);
259 
260         acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
261                             processor->lapic_flags & ACPI_MADT_ENABLED);
262 
263         return 0;
264 }
265 
266 static int __init
267 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
268                           const unsigned long end)
269 {
270         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
271 
272         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
273 
274         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
275                 return -EINVAL;
276 
277         acpi_lapic_addr = lapic_addr_ovr->address;
278 
279         return 0;
280 }
281 
282 static int __init
283 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
284                       const unsigned long end)
285 {
286         struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
287 
288         x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
289 
290         if (BAD_MADT_ENTRY(x2apic_nmi, end))
291                 return -EINVAL;
292 
293         acpi_table_print_madt_entry(header);
294 
295         if (x2apic_nmi->lint != 1)
296                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
297 
298         return 0;
299 }
300 
301 static int __init
302 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
303 {
304         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
305 
306         lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
307 
308         if (BAD_MADT_ENTRY(lapic_nmi, end))
309                 return -EINVAL;
310 
311         acpi_table_print_madt_entry(header);
312 
313         if (lapic_nmi->lint != 1)
314                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
315 
316         return 0;
317 }
318 
319 #endif                          /*CONFIG_X86_LOCAL_APIC */
320 
321 #ifdef CONFIG_X86_IO_APIC
322 #define MP_ISA_BUS              0
323 
324 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
325                                           u32 gsi)
326 {
327         int ioapic;
328         int pin;
329         struct mpc_intsrc mp_irq;
330 
331         /*
332          * Convert 'gsi' to 'ioapic.pin'.
333          */
334         ioapic = mp_find_ioapic(gsi);
335         if (ioapic < 0)
336                 return;
337         pin = mp_find_ioapic_pin(ioapic, gsi);
338 
339         /*
340          * TBD: This check is for faulty timer entries, where the override
341          *      erroneously sets the trigger to level, resulting in a HUGE
342          *      increase of timer interrupts!
343          */
344         if ((bus_irq == 0) && (trigger == 3))
345                 trigger = 1;
346 
347         mp_irq.type = MP_INTSRC;
348         mp_irq.irqtype = mp_INT;
349         mp_irq.irqflag = (trigger << 2) | polarity;
350         mp_irq.srcbus = MP_ISA_BUS;
351         mp_irq.srcbusirq = bus_irq;     /* IRQ */
352         mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
353         mp_irq.dstirq = pin;    /* INTIN# */
354 
355         mp_save_irq(&mp_irq);
356 
357         /*
358          * Reset default identity mapping if gsi is also an legacy IRQ,
359          * otherwise there will be more than one entry with the same GSI
360          * and acpi_isa_irq_to_gsi() may give wrong result.
361          */
362         if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
363                 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
364         isa_irq_to_gsi[bus_irq] = gsi;
365 }
366 
367 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
368                         int polarity)
369 {
370 #ifdef CONFIG_X86_MPPARSE
371         struct mpc_intsrc mp_irq;
372         struct pci_dev *pdev;
373         unsigned char number;
374         unsigned int devfn;
375         int ioapic;
376         u8 pin;
377 
378         if (!acpi_ioapic)
379                 return 0;
380         if (!dev || !dev_is_pci(dev))
381                 return 0;
382 
383         pdev = to_pci_dev(dev);
384         number = pdev->bus->number;
385         devfn = pdev->devfn;
386         pin = pdev->pin;
387         /* print the entry should happen on mptable identically */
388         mp_irq.type = MP_INTSRC;
389         mp_irq.irqtype = mp_INT;
390         mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
391                                 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
392         mp_irq.srcbus = number;
393         mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
394         ioapic = mp_find_ioapic(gsi);
395         mp_irq.dstapic = mpc_ioapic_id(ioapic);
396         mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
397 
398         mp_save_irq(&mp_irq);
399 #endif
400         return 0;
401 }
402 
403 static int __init
404 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
405 {
406         struct acpi_madt_io_apic *ioapic = NULL;
407         struct ioapic_domain_cfg cfg = {
408                 .type = IOAPIC_DOMAIN_DYNAMIC,
409                 .ops = &mp_ioapic_irqdomain_ops,
410         };
411 
412         ioapic = (struct acpi_madt_io_apic *)header;
413 
414         if (BAD_MADT_ENTRY(ioapic, end))
415                 return -EINVAL;
416 
417         acpi_table_print_madt_entry(header);
418 
419         /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
420         if (ioapic->global_irq_base < nr_legacy_irqs())
421                 cfg.type = IOAPIC_DOMAIN_LEGACY;
422 
423         mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
424                            &cfg);
425 
426         return 0;
427 }
428 
429 /*
430  * Parse Interrupt Source Override for the ACPI SCI
431  */
432 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
433 {
434         if (trigger == 0)       /* compatible SCI trigger is level */
435                 trigger = 3;
436 
437         if (polarity == 0)      /* compatible SCI polarity is low */
438                 polarity = 3;
439 
440         /* Command-line over-ride via acpi_sci= */
441         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
442                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
443 
444         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
445                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
446 
447         mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
448         acpi_penalize_sci_irq(bus_irq, trigger, polarity);
449 
450         /*
451          * stash over-ride to indicate we've been here
452          * and for later update of acpi_gbl_FADT
453          */
454         acpi_sci_override_gsi = gsi;
455         return;
456 }
457 
458 static int __init
459 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
460                        const unsigned long end)
461 {
462         struct acpi_madt_interrupt_override *intsrc = NULL;
463 
464         intsrc = (struct acpi_madt_interrupt_override *)header;
465 
466         if (BAD_MADT_ENTRY(intsrc, end))
467                 return -EINVAL;
468 
469         acpi_table_print_madt_entry(header);
470 
471         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
472                 acpi_sci_ioapic_setup(intsrc->source_irq,
473                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
474                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
475                                       intsrc->global_irq);
476                 return 0;
477         }
478 
479         if (intsrc->source_irq == 0) {
480                 if (acpi_skip_timer_override) {
481                         printk(PREFIX "BIOS IRQ0 override ignored.\n");
482                         return 0;
483                 }
484 
485                 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
486                         && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
487                         intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
488                         printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
489                 }
490         }
491 
492         mp_override_legacy_irq(intsrc->source_irq,
493                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
494                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
495                                 intsrc->global_irq);
496 
497         return 0;
498 }
499 
500 static int __init
501 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
502 {
503         struct acpi_madt_nmi_source *nmi_src = NULL;
504 
505         nmi_src = (struct acpi_madt_nmi_source *)header;
506 
507         if (BAD_MADT_ENTRY(nmi_src, end))
508                 return -EINVAL;
509 
510         acpi_table_print_madt_entry(header);
511 
512         /* TBD: Support nimsrc entries? */
513 
514         return 0;
515 }
516 
517 #endif                          /* CONFIG_X86_IO_APIC */
518 
519 /*
520  * acpi_pic_sci_set_trigger()
521  *
522  * use ELCR to set PIC-mode trigger type for SCI
523  *
524  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
525  * it may require Edge Trigger -- use "acpi_sci=edge"
526  *
527  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
528  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
529  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
530  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
531  */
532 
533 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
534 {
535         unsigned int mask = 1 << irq;
536         unsigned int old, new;
537 
538         /* Real old ELCR mask */
539         old = inb(0x4d0) | (inb(0x4d1) << 8);
540 
541         /*
542          * If we use ACPI to set PCI IRQs, then we should clear ELCR
543          * since we will set it correctly as we enable the PCI irq
544          * routing.
545          */
546         new = acpi_noirq ? old : 0;
547 
548         /*
549          * Update SCI information in the ELCR, it isn't in the PCI
550          * routing tables..
551          */
552         switch (trigger) {
553         case 1:         /* Edge - clear */
554                 new &= ~mask;
555                 break;
556         case 3:         /* Level - set */
557                 new |= mask;
558                 break;
559         }
560 
561         if (old == new)
562                 return;
563 
564         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
565         outb(new, 0x4d0);
566         outb(new >> 8, 0x4d1);
567 }
568 
569 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
570 {
571         int rc, irq, trigger, polarity;
572 
573         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
574                 *irqp = gsi;
575                 return 0;
576         }
577 
578         rc = acpi_get_override_irq(gsi, &trigger, &polarity);
579         if (rc == 0) {
580                 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
581                 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
582                 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
583                 if (irq >= 0) {
584                         *irqp = irq;
585                         return 0;
586                 }
587         }
588 
589         return -1;
590 }
591 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
592 
593 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
594 {
595         if (isa_irq < nr_legacy_irqs() &&
596             isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
597                 *gsi = isa_irq_to_gsi[isa_irq];
598                 return 0;
599         }
600 
601         return -1;
602 }
603 
604 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
605                                  int trigger, int polarity)
606 {
607 #ifdef CONFIG_PCI
608         /*
609          * Make sure all (legacy) PCI IRQs are set as level-triggered.
610          */
611         if (trigger == ACPI_LEVEL_SENSITIVE)
612                 elcr_set_level_irq(gsi);
613 #endif
614 
615         return gsi;
616 }
617 
618 #ifdef CONFIG_X86_LOCAL_APIC
619 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
620                                     int trigger, int polarity)
621 {
622         int irq = gsi;
623 #ifdef CONFIG_X86_IO_APIC
624         int node;
625         struct irq_alloc_info info;
626 
627         node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
628         trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
629         polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
630         ioapic_set_alloc_attr(&info, node, trigger, polarity);
631 
632         mutex_lock(&acpi_ioapic_lock);
633         irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
634         /* Don't set up the ACPI SCI because it's already set up */
635         if (irq >= 0 && enable_update_mptable &&
636             acpi_gbl_FADT.sci_interrupt != gsi)
637                 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
638         mutex_unlock(&acpi_ioapic_lock);
639 #endif
640 
641         return irq;
642 }
643 
644 static void acpi_unregister_gsi_ioapic(u32 gsi)
645 {
646 #ifdef CONFIG_X86_IO_APIC
647         int irq;
648 
649         mutex_lock(&acpi_ioapic_lock);
650         irq = mp_map_gsi_to_irq(gsi, 0, NULL);
651         if (irq > 0)
652                 mp_unmap_irq(irq);
653         mutex_unlock(&acpi_ioapic_lock);
654 #endif
655 }
656 #endif
657 
658 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
659                            int trigger, int polarity) = acpi_register_gsi_pic;
660 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
661 
662 #ifdef CONFIG_ACPI_SLEEP
663 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
664 #else
665 int (*acpi_suspend_lowlevel)(void);
666 #endif
667 
668 /*
669  * success: return IRQ number (>=0)
670  * failure: return < 0
671  */
672 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
673 {
674         return __acpi_register_gsi(dev, gsi, trigger, polarity);
675 }
676 EXPORT_SYMBOL_GPL(acpi_register_gsi);
677 
678 void acpi_unregister_gsi(u32 gsi)
679 {
680         if (__acpi_unregister_gsi)
681                 __acpi_unregister_gsi(gsi);
682 }
683 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
684 
685 #ifdef CONFIG_X86_LOCAL_APIC
686 static void __init acpi_set_irq_model_ioapic(void)
687 {
688         acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
689         __acpi_register_gsi = acpi_register_gsi_ioapic;
690         __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
691         acpi_ioapic = 1;
692 }
693 #endif
694 
695 /*
696  *  ACPI based hotplug support for CPU
697  */
698 #ifdef CONFIG_ACPI_HOTPLUG_CPU
699 #include <acpi/processor.h>
700 
701 static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
702 {
703 #ifdef CONFIG_ACPI_NUMA
704         int nid;
705 
706         nid = acpi_get_node(handle);
707         if (nid != -1) {
708                 set_apicid_to_node(physid, nid);
709                 numa_set_node(cpu, nid);
710         }
711 #endif
712 }
713 
714 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
715 {
716         int cpu;
717 
718         cpu = acpi_register_lapic(physid, ACPI_MADT_ENABLED);
719         if (cpu < 0) {
720                 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
721                 return cpu;
722         }
723 
724         acpi_processor_set_pdc(handle);
725         acpi_map_cpu2node(handle, cpu, physid);
726 
727         *pcpu = cpu;
728         return 0;
729 }
730 
731 /* wrapper to silence section mismatch warning */
732 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
733 {
734         return _acpi_map_lsapic(handle, physid, pcpu);
735 }
736 EXPORT_SYMBOL(acpi_map_cpu);
737 
738 int acpi_unmap_cpu(int cpu)
739 {
740 #ifdef CONFIG_ACPI_NUMA
741         set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
742 #endif
743 
744         per_cpu(x86_cpu_to_apicid, cpu) = -1;
745         set_cpu_present(cpu, false);
746         num_processors--;
747 
748         return (0);
749 }
750 EXPORT_SYMBOL(acpi_unmap_cpu);
751 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
752 
753 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
754 {
755         int ret = -ENOSYS;
756 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
757         int ioapic_id;
758         u64 addr;
759         struct ioapic_domain_cfg cfg = {
760                 .type = IOAPIC_DOMAIN_DYNAMIC,
761                 .ops = &mp_ioapic_irqdomain_ops,
762         };
763 
764         ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
765         if (ioapic_id < 0) {
766                 unsigned long long uid;
767                 acpi_status status;
768 
769                 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
770                                                NULL, &uid);
771                 if (ACPI_FAILURE(status)) {
772                         acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
773                         return -EINVAL;
774                 }
775                 ioapic_id = (int)uid;
776         }
777 
778         mutex_lock(&acpi_ioapic_lock);
779         ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
780         mutex_unlock(&acpi_ioapic_lock);
781 #endif
782 
783         return ret;
784 }
785 EXPORT_SYMBOL(acpi_register_ioapic);
786 
787 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
788 {
789         int ret = -ENOSYS;
790 
791 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
792         mutex_lock(&acpi_ioapic_lock);
793         ret  = mp_unregister_ioapic(gsi_base);
794         mutex_unlock(&acpi_ioapic_lock);
795 #endif
796 
797         return ret;
798 }
799 EXPORT_SYMBOL(acpi_unregister_ioapic);
800 
801 /**
802  * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
803  *                          has been registered
804  * @handle:     ACPI handle of the IOAPIC deivce
805  * @gsi_base:   GSI base associated with the IOAPIC
806  *
807  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
808  * with acpi_register_ioapic()/acpi_unregister_ioapic().
809  */
810 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
811 {
812         int ret = 0;
813 
814 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
815         mutex_lock(&acpi_ioapic_lock);
816         ret  = mp_ioapic_registered(gsi_base);
817         mutex_unlock(&acpi_ioapic_lock);
818 #endif
819 
820         return ret;
821 }
822 
823 static int __init acpi_parse_sbf(struct acpi_table_header *table)
824 {
825         struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
826 
827         sbf_port = sb->cmos_index;      /* Save CMOS port */
828 
829         return 0;
830 }
831 
832 #ifdef CONFIG_HPET_TIMER
833 #include <asm/hpet.h>
834 
835 static struct resource *hpet_res __initdata;
836 
837 static int __init acpi_parse_hpet(struct acpi_table_header *table)
838 {
839         struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
840 
841         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
842                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
843                        "memory.\n");
844                 return -1;
845         }
846 
847         hpet_address = hpet_tbl->address.address;
848         hpet_blockid = hpet_tbl->sequence;
849 
850         /*
851          * Some broken BIOSes advertise HPET at 0x0. We really do not
852          * want to allocate a resource there.
853          */
854         if (!hpet_address) {
855                 printk(KERN_WARNING PREFIX
856                        "HPET id: %#x base: %#lx is invalid\n",
857                        hpet_tbl->id, hpet_address);
858                 return 0;
859         }
860 #ifdef CONFIG_X86_64
861         /*
862          * Some even more broken BIOSes advertise HPET at
863          * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
864          * some noise:
865          */
866         if (hpet_address == 0xfed0000000000000UL) {
867                 if (!hpet_force_user) {
868                         printk(KERN_WARNING PREFIX "HPET id: %#x "
869                                "base: 0xfed0000000000000 is bogus\n "
870                                "try hpet=force on the kernel command line to "
871                                "fix it up to 0xfed00000.\n", hpet_tbl->id);
872                         hpet_address = 0;
873                         return 0;
874                 }
875                 printk(KERN_WARNING PREFIX
876                        "HPET id: %#x base: 0xfed0000000000000 fixed up "
877                        "to 0xfed00000.\n", hpet_tbl->id);
878                 hpet_address >>= 32;
879         }
880 #endif
881         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
882                hpet_tbl->id, hpet_address);
883 
884         /*
885          * Allocate and initialize the HPET firmware resource for adding into
886          * the resource tree during the lateinit timeframe.
887          */
888 #define HPET_RESOURCE_NAME_SIZE 9
889         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
890 
891         hpet_res->name = (void *)&hpet_res[1];
892         hpet_res->flags = IORESOURCE_MEM;
893         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
894                  hpet_tbl->sequence);
895 
896         hpet_res->start = hpet_address;
897         hpet_res->end = hpet_address + (1 * 1024) - 1;
898 
899         return 0;
900 }
901 
902 /*
903  * hpet_insert_resource inserts the HPET resources used into the resource
904  * tree.
905  */
906 static __init int hpet_insert_resource(void)
907 {
908         if (!hpet_res)
909                 return 1;
910 
911         return insert_resource(&iomem_resource, hpet_res);
912 }
913 
914 late_initcall(hpet_insert_resource);
915 
916 #else
917 #define acpi_parse_hpet NULL
918 #endif
919 
920 static int __init acpi_parse_fadt(struct acpi_table_header *table)
921 {
922 
923 #ifdef CONFIG_X86_PM_TIMER
924         /* detect the location of the ACPI PM Timer */
925         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
926                 /* FADT rev. 2 */
927                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
928                     ACPI_ADR_SPACE_SYSTEM_IO)
929                         return 0;
930 
931                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
932                 /*
933                  * "X" fields are optional extensions to the original V1.0
934                  * fields, so we must selectively expand V1.0 fields if the
935                  * corresponding X field is zero.
936                  */
937                 if (!pmtmr_ioport)
938                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
939         } else {
940                 /* FADT rev. 1 */
941                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
942         }
943         if (pmtmr_ioport)
944                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
945                        pmtmr_ioport);
946 #endif
947         return 0;
948 }
949 
950 #ifdef  CONFIG_X86_LOCAL_APIC
951 /*
952  * Parse LAPIC entries in MADT
953  * returns 0 on success, < 0 on error
954  */
955 
956 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
957 {
958         int count;
959 
960         if (!cpu_has_apic)
961                 return -ENODEV;
962 
963         /*
964          * Note that the LAPIC address is obtained from the MADT (32-bit value)
965          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
966          */
967 
968         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
969                                       acpi_parse_lapic_addr_ovr, 0);
970         if (count < 0) {
971                 printk(KERN_ERR PREFIX
972                        "Error parsing LAPIC address override entry\n");
973                 return count;
974         }
975 
976         register_lapic_address(acpi_lapic_addr);
977 
978         return count;
979 }
980 
981 static int __init acpi_parse_madt_lapic_entries(void)
982 {
983         int count;
984         int x2count = 0;
985 
986         if (!cpu_has_apic)
987                 return -ENODEV;
988 
989         /*
990          * Note that the LAPIC address is obtained from the MADT (32-bit value)
991          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
992          */
993 
994         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
995                                       acpi_parse_lapic_addr_ovr, 0);
996         if (count < 0) {
997                 printk(KERN_ERR PREFIX
998                        "Error parsing LAPIC address override entry\n");
999                 return count;
1000         }
1001 
1002         register_lapic_address(acpi_lapic_addr);
1003 
1004         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1005                                       acpi_parse_sapic, MAX_LOCAL_APIC);
1006 
1007         if (!count) {
1008                 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
1009                                         acpi_parse_x2apic, MAX_LOCAL_APIC);
1010                 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
1011                                         acpi_parse_lapic, MAX_LOCAL_APIC);
1012         }
1013         if (!count && !x2count) {
1014                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1015                 /* TBD: Cleanup to allow fallback to MPS */
1016                 return -ENODEV;
1017         } else if (count < 0 || x2count < 0) {
1018                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1019                 /* TBD: Cleanup to allow fallback to MPS */
1020                 return count;
1021         }
1022 
1023         x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1024                                         acpi_parse_x2apic_nmi, 0);
1025         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1026                                       acpi_parse_lapic_nmi, 0);
1027         if (count < 0 || x2count < 0) {
1028                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1029                 /* TBD: Cleanup to allow fallback to MPS */
1030                 return count;
1031         }
1032         return 0;
1033 }
1034 #endif                          /* CONFIG_X86_LOCAL_APIC */
1035 
1036 #ifdef  CONFIG_X86_IO_APIC
1037 static void __init mp_config_acpi_legacy_irqs(void)
1038 {
1039         int i;
1040         struct mpc_intsrc mp_irq;
1041 
1042 #ifdef CONFIG_EISA
1043         /*
1044          * Fabricate the legacy ISA bus (bus #31).
1045          */
1046         mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1047 #endif
1048         set_bit(MP_ISA_BUS, mp_bus_not_pci);
1049         pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1050 
1051         /*
1052          * Use the default configuration for the IRQs 0-15.  Unless
1053          * overridden by (MADT) interrupt source override entries.
1054          */
1055         for (i = 0; i < nr_legacy_irqs(); i++) {
1056                 int ioapic, pin;
1057                 unsigned int dstapic;
1058                 int idx;
1059                 u32 gsi;
1060 
1061                 /* Locate the gsi that irq i maps to. */
1062                 if (acpi_isa_irq_to_gsi(i, &gsi))
1063                         continue;
1064 
1065                 /*
1066                  * Locate the IOAPIC that manages the ISA IRQ.
1067                  */
1068                 ioapic = mp_find_ioapic(gsi);
1069                 if (ioapic < 0)
1070                         continue;
1071                 pin = mp_find_ioapic_pin(ioapic, gsi);
1072                 dstapic = mpc_ioapic_id(ioapic);
1073 
1074                 for (idx = 0; idx < mp_irq_entries; idx++) {
1075                         struct mpc_intsrc *irq = mp_irqs + idx;
1076 
1077                         /* Do we already have a mapping for this ISA IRQ? */
1078                         if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1079                                 break;
1080 
1081                         /* Do we already have a mapping for this IOAPIC pin */
1082                         if (irq->dstapic == dstapic && irq->dstirq == pin)
1083                                 break;
1084                 }
1085 
1086                 if (idx != mp_irq_entries) {
1087                         printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1088                         continue;       /* IRQ already used */
1089                 }
1090 
1091                 mp_irq.type = MP_INTSRC;
1092                 mp_irq.irqflag = 0;     /* Conforming */
1093                 mp_irq.srcbus = MP_ISA_BUS;
1094                 mp_irq.dstapic = dstapic;
1095                 mp_irq.irqtype = mp_INT;
1096                 mp_irq.srcbusirq = i; /* Identity mapped */
1097                 mp_irq.dstirq = pin;
1098 
1099                 mp_save_irq(&mp_irq);
1100         }
1101 }
1102 
1103 /*
1104  * Parse IOAPIC related entries in MADT
1105  * returns 0 on success, < 0 on error
1106  */
1107 static int __init acpi_parse_madt_ioapic_entries(void)
1108 {
1109         int count;
1110 
1111         /*
1112          * ACPI interpreter is required to complete interrupt setup,
1113          * so if it is off, don't enumerate the io-apics with ACPI.
1114          * If MPS is present, it will handle them,
1115          * otherwise the system will stay in PIC mode
1116          */
1117         if (acpi_disabled || acpi_noirq)
1118                 return -ENODEV;
1119 
1120         if (!cpu_has_apic)
1121                 return -ENODEV;
1122 
1123         /*
1124          * if "noapic" boot option, don't look for IO-APICs
1125          */
1126         if (skip_ioapic_setup) {
1127                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1128                        "due to 'noapic' option.\n");
1129                 return -ENODEV;
1130         }
1131 
1132         count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1133                                       MAX_IO_APICS);
1134         if (!count) {
1135                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1136                 return -ENODEV;
1137         } else if (count < 0) {
1138                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1139                 return count;
1140         }
1141 
1142         count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1143                                       acpi_parse_int_src_ovr, nr_irqs);
1144         if (count < 0) {
1145                 printk(KERN_ERR PREFIX
1146                        "Error parsing interrupt source overrides entry\n");
1147                 /* TBD: Cleanup to allow fallback to MPS */
1148                 return count;
1149         }
1150 
1151         /*
1152          * If BIOS did not supply an INT_SRC_OVR for the SCI
1153          * pretend we got one so we can set the SCI flags.
1154          */
1155         if (!acpi_sci_override_gsi)
1156                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1157                                       acpi_gbl_FADT.sci_interrupt);
1158 
1159         /* Fill in identity legacy mappings where no override */
1160         mp_config_acpi_legacy_irqs();
1161 
1162         count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1163                                       acpi_parse_nmi_src, nr_irqs);
1164         if (count < 0) {
1165                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1166                 /* TBD: Cleanup to allow fallback to MPS */
1167                 return count;
1168         }
1169 
1170         return 0;
1171 }
1172 #else
1173 static inline int acpi_parse_madt_ioapic_entries(void)
1174 {
1175         return -1;
1176 }
1177 #endif  /* !CONFIG_X86_IO_APIC */
1178 
1179 static void __init early_acpi_process_madt(void)
1180 {
1181 #ifdef CONFIG_X86_LOCAL_APIC
1182         int error;
1183 
1184         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1185 
1186                 /*
1187                  * Parse MADT LAPIC entries
1188                  */
1189                 error = early_acpi_parse_madt_lapic_addr_ovr();
1190                 if (!error) {
1191                         acpi_lapic = 1;
1192                         smp_found_config = 1;
1193                 }
1194                 if (error == -EINVAL) {
1195                         /*
1196                          * Dell Precision Workstation 410, 610 come here.
1197                          */
1198                         printk(KERN_ERR PREFIX
1199                                "Invalid BIOS MADT, disabling ACPI\n");
1200                         disable_acpi();
1201                 }
1202         }
1203 #endif
1204 }
1205 
1206 static void __init acpi_process_madt(void)
1207 {
1208 #ifdef CONFIG_X86_LOCAL_APIC
1209         int error;
1210 
1211         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1212 
1213                 /*
1214                  * Parse MADT LAPIC entries
1215                  */
1216                 error = acpi_parse_madt_lapic_entries();
1217                 if (!error) {
1218                         acpi_lapic = 1;
1219 
1220                         /*
1221                          * Parse MADT IO-APIC entries
1222                          */
1223                         mutex_lock(&acpi_ioapic_lock);
1224                         error = acpi_parse_madt_ioapic_entries();
1225                         mutex_unlock(&acpi_ioapic_lock);
1226                         if (!error) {
1227                                 acpi_set_irq_model_ioapic();
1228 
1229                                 smp_found_config = 1;
1230                         }
1231                 }
1232                 if (error == -EINVAL) {
1233                         /*
1234                          * Dell Precision Workstation 410, 610 come here.
1235                          */
1236                         printk(KERN_ERR PREFIX
1237                                "Invalid BIOS MADT, disabling ACPI\n");
1238                         disable_acpi();
1239                 }
1240         } else {
1241                 /*
1242                  * ACPI found no MADT, and so ACPI wants UP PIC mode.
1243                  * In the event an MPS table was found, forget it.
1244                  * Boot with "acpi=off" to use MPS on such a system.
1245                  */
1246                 if (smp_found_config) {
1247                         printk(KERN_WARNING PREFIX
1248                                 "No APIC-table, disabling MPS\n");
1249                         smp_found_config = 0;
1250                 }
1251         }
1252 
1253         /*
1254          * ACPI supports both logical (e.g. Hyper-Threading) and physical
1255          * processors, where MPS only supports physical.
1256          */
1257         if (acpi_lapic && acpi_ioapic)
1258                 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1259                        "information\n");
1260         else if (acpi_lapic)
1261                 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1262                        "configuration information\n");
1263 #endif
1264         return;
1265 }
1266 
1267 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1268 {
1269         if (!acpi_force) {
1270                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1271                        d->ident);
1272                 acpi_noirq_set();
1273         }
1274         return 0;
1275 }
1276 
1277 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1278 {
1279         if (!acpi_force) {
1280                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1281                        d->ident);
1282                 acpi_disable_pci();
1283         }
1284         return 0;
1285 }
1286 
1287 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1288 {
1289         if (!acpi_force) {
1290                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1291                 disable_acpi();
1292         } else {
1293                 printk(KERN_NOTICE
1294                        "Warning: DMI blacklist says broken, but acpi forced\n");
1295         }
1296         return 0;
1297 }
1298 
1299 /*
1300  * Force ignoring BIOS IRQ0 override
1301  */
1302 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1303 {
1304         if (!acpi_skip_timer_override) {
1305                 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1306                         d->ident);
1307                 acpi_skip_timer_override = 1;
1308         }
1309         return 0;
1310 }
1311 
1312 /*
1313  * ACPI offers an alternative platform interface model that removes
1314  * ACPI hardware requirements for platforms that do not implement
1315  * the PC Architecture.
1316  *
1317  * We initialize the Hardware-reduced ACPI model here:
1318  */
1319 static void __init acpi_reduced_hw_init(void)
1320 {
1321         if (acpi_gbl_reduced_hardware) {
1322                 /*
1323                  * Override x86_init functions and bypass legacy pic
1324                  * in Hardware-reduced ACPI mode
1325                  */
1326                 x86_init.timers.timer_init      = x86_init_noop;
1327                 x86_init.irqs.pre_vector_init   = x86_init_noop;
1328                 legacy_pic                      = &null_legacy_pic;
1329         }
1330 }
1331 
1332 /*
1333  * If your system is blacklisted here, but you find that acpi=force
1334  * works for you, please contact linux-acpi@vger.kernel.org
1335  */
1336 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1337         /*
1338          * Boxes that need ACPI disabled
1339          */
1340         {
1341          .callback = dmi_disable_acpi,
1342          .ident = "IBM Thinkpad",
1343          .matches = {
1344                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1345                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1346                      },
1347          },
1348 
1349         /*
1350          * Boxes that need ACPI PCI IRQ routing disabled
1351          */
1352         {
1353          .callback = disable_acpi_irq,
1354          .ident = "ASUS A7V",
1355          .matches = {
1356                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1357                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1358                      /* newer BIOS, Revision 1011, does work */
1359                      DMI_MATCH(DMI_BIOS_VERSION,
1360                                "ASUS A7V ACPI BIOS Revision 1007"),
1361                      },
1362          },
1363         {
1364                 /*
1365                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1366                  * for LPC bridge, which is needed for the PCI
1367                  * interrupt links to work. DSDT fix is in bug 5966.
1368                  * 2645, 2646 model numbers are shared with 600/600E/600X
1369                  */
1370          .callback = disable_acpi_irq,
1371          .ident = "IBM Thinkpad 600 Series 2645",
1372          .matches = {
1373                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1374                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1375                      },
1376          },
1377         {
1378          .callback = disable_acpi_irq,
1379          .ident = "IBM Thinkpad 600 Series 2646",
1380          .matches = {
1381                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1382                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1383                      },
1384          },
1385         /*
1386          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1387          */
1388         {                       /* _BBN 0 bug */
1389          .callback = disable_acpi_pci,
1390          .ident = "ASUS PR-DLS",
1391          .matches = {
1392                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1393                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1394                      DMI_MATCH(DMI_BIOS_VERSION,
1395                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1396                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1397                      },
1398          },
1399         {
1400          .callback = disable_acpi_pci,
1401          .ident = "Acer TravelMate 36x Laptop",
1402          .matches = {
1403                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1404                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1405                      },
1406          },
1407         {}
1408 };
1409 
1410 /* second table for DMI checks that should run after early-quirks */
1411 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1412         /*
1413          * HP laptops which use a DSDT reporting as HP/SB400/10000,
1414          * which includes some code which overrides all temperature
1415          * trip points to 16C if the INTIN2 input of the I/O APIC
1416          * is enabled.  This input is incorrectly designated the
1417          * ISA IRQ 0 via an interrupt source override even though
1418          * it is wired to the output of the master 8259A and INTIN0
1419          * is not connected at all.  Force ignoring BIOS IRQ0
1420          * override in that cases.
1421          */
1422         {
1423          .callback = dmi_ignore_irq0_timer_override,
1424          .ident = "HP nx6115 laptop",
1425          .matches = {
1426                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1427                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1428                      },
1429          },
1430         {
1431          .callback = dmi_ignore_irq0_timer_override,
1432          .ident = "HP NX6125 laptop",
1433          .matches = {
1434                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1435                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1436                      },
1437          },
1438         {
1439          .callback = dmi_ignore_irq0_timer_override,
1440          .ident = "HP NX6325 laptop",
1441          .matches = {
1442                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1443                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1444                      },
1445          },
1446         {
1447          .callback = dmi_ignore_irq0_timer_override,
1448          .ident = "HP 6715b laptop",
1449          .matches = {
1450                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1451                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1452                      },
1453          },
1454         {
1455          .callback = dmi_ignore_irq0_timer_override,
1456          .ident = "FUJITSU SIEMENS",
1457          .matches = {
1458                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1459                      DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1460                      },
1461          },
1462         {}
1463 };
1464 
1465 /*
1466  * acpi_boot_table_init() and acpi_boot_init()
1467  *  called from setup_arch(), always.
1468  *      1. checksums all tables
1469  *      2. enumerates lapics
1470  *      3. enumerates io-apics
1471  *
1472  * acpi_table_init() is separate to allow reading SRAT without
1473  * other side effects.
1474  *
1475  * side effects of acpi_boot_init:
1476  *      acpi_lapic = 1 if LAPIC found
1477  *      acpi_ioapic = 1 if IOAPIC found
1478  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1479  *      if acpi_blacklisted() acpi_disabled = 1;
1480  *      acpi_irq_model=...
1481  *      ...
1482  */
1483 
1484 void __init acpi_boot_table_init(void)
1485 {
1486         dmi_check_system(acpi_dmi_table);
1487 
1488         /*
1489          * If acpi_disabled, bail out
1490          */
1491         if (acpi_disabled)
1492                 return; 
1493 
1494         /*
1495          * Initialize the ACPI boot-time table parser.
1496          */
1497         if (acpi_table_init()) {
1498                 disable_acpi();
1499                 return;
1500         }
1501 
1502         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1503 
1504         /*
1505          * blacklist may disable ACPI entirely
1506          */
1507         if (acpi_blacklisted()) {
1508                 if (acpi_force) {
1509                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1510                 } else {
1511                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1512                         disable_acpi();
1513                         return;
1514                 }
1515         }
1516 }
1517 
1518 int __init early_acpi_boot_init(void)
1519 {
1520         /*
1521          * If acpi_disabled, bail out
1522          */
1523         if (acpi_disabled)
1524                 return 1;
1525 
1526         /*
1527          * Process the Multiple APIC Description Table (MADT), if present
1528          */
1529         early_acpi_process_madt();
1530 
1531         /*
1532          * Hardware-reduced ACPI mode initialization:
1533          */
1534         acpi_reduced_hw_init();
1535 
1536         return 0;
1537 }
1538 
1539 int __init acpi_boot_init(void)
1540 {
1541         /* those are executed after early-quirks are executed */
1542         dmi_check_system(acpi_dmi_table_late);
1543 
1544         /*
1545          * If acpi_disabled, bail out
1546          */
1547         if (acpi_disabled)
1548                 return 1;
1549 
1550         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1551 
1552         /*
1553          * set sci_int and PM timer address
1554          */
1555         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1556 
1557         /*
1558          * Process the Multiple APIC Description Table (MADT), if present
1559          */
1560         acpi_process_madt();
1561 
1562         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1563 
1564         if (!acpi_noirq)
1565                 x86_init.pci.init = pci_acpi_init;
1566 
1567         return 0;
1568 }
1569 
1570 static int __init parse_acpi(char *arg)
1571 {
1572         if (!arg)
1573                 return -EINVAL;
1574 
1575         /* "acpi=off" disables both ACPI table parsing and interpreter */
1576         if (strcmp(arg, "off") == 0) {
1577                 disable_acpi();
1578         }
1579         /* acpi=force to over-ride black-list */
1580         else if (strcmp(arg, "force") == 0) {
1581                 acpi_force = 1;
1582                 acpi_disabled = 0;
1583         }
1584         /* acpi=strict disables out-of-spec workarounds */
1585         else if (strcmp(arg, "strict") == 0) {
1586                 acpi_strict = 1;
1587         }
1588         /* acpi=rsdt use RSDT instead of XSDT */
1589         else if (strcmp(arg, "rsdt") == 0) {
1590                 acpi_gbl_do_not_use_xsdt = TRUE;
1591         }
1592         /* "acpi=noirq" disables ACPI interrupt routing */
1593         else if (strcmp(arg, "noirq") == 0) {
1594                 acpi_noirq_set();
1595         }
1596         /* "acpi=copy_dsdt" copys DSDT */
1597         else if (strcmp(arg, "copy_dsdt") == 0) {
1598                 acpi_gbl_copy_dsdt_locally = 1;
1599         }
1600         /* "acpi=nocmcff" disables FF mode for corrected errors */
1601         else if (strcmp(arg, "nocmcff") == 0) {
1602                 acpi_disable_cmcff = 1;
1603         } else {
1604                 /* Core will printk when we return error. */
1605                 return -EINVAL;
1606         }
1607         return 0;
1608 }
1609 early_param("acpi", parse_acpi);
1610 
1611 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1612 static int __init parse_pci(char *arg)
1613 {
1614         if (arg && strcmp(arg, "noacpi") == 0)
1615                 acpi_disable_pci();
1616         return 0;
1617 }
1618 early_param("pci", parse_pci);
1619 
1620 int __init acpi_mps_check(void)
1621 {
1622 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1623 /* mptable code is not built-in*/
1624         if (acpi_disabled || acpi_noirq) {
1625                 printk(KERN_WARNING "MPS support code is not built-in.\n"
1626                        "Using acpi=off or acpi=noirq or pci=noacpi "
1627                        "may have problem\n");
1628                 return 1;
1629         }
1630 #endif
1631         return 0;
1632 }
1633 
1634 #ifdef CONFIG_X86_IO_APIC
1635 static int __init parse_acpi_skip_timer_override(char *arg)
1636 {
1637         acpi_skip_timer_override = 1;
1638         return 0;
1639 }
1640 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1641 
1642 static int __init parse_acpi_use_timer_override(char *arg)
1643 {
1644         acpi_use_timer_override = 1;
1645         return 0;
1646 }
1647 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1648 #endif /* CONFIG_X86_IO_APIC */
1649 
1650 static int __init setup_acpi_sci(char *s)
1651 {
1652         if (!s)
1653                 return -EINVAL;
1654         if (!strcmp(s, "edge"))
1655                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1656                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1657         else if (!strcmp(s, "level"))
1658                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1659                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1660         else if (!strcmp(s, "high"))
1661                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1662                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1663         else if (!strcmp(s, "low"))
1664                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1665                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1666         else
1667                 return -EINVAL;
1668         return 0;
1669 }
1670 early_param("acpi_sci", setup_acpi_sci);
1671 
1672 int __acpi_acquire_global_lock(unsigned int *lock)
1673 {
1674         unsigned int old, new, val;
1675         do {
1676                 old = *lock;
1677                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1678                 val = cmpxchg(lock, old, new);
1679         } while (unlikely (val != old));
1680         return (new < 3) ? -1 : 0;
1681 }
1682 
1683 int __acpi_release_global_lock(unsigned int *lock)
1684 {
1685         unsigned int old, new, val;
1686         do {
1687                 old = *lock;
1688                 new = old & ~0x3;
1689                 val = cmpxchg(lock, old, new);
1690         } while (unlikely (val != old));
1691         return old & 0x1;
1692 }
1693 
1694 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1695 {
1696         e820_add_region(addr, size, E820_ACPI);
1697         update_e820();
1698 }
1699 

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