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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/irqdomain.h>
 35 #include <linux/slab.h>
 36 #include <linux/bootmem.h>
 37 #include <linux/ioport.h>
 38 #include <linux/pci.h>
 39 
 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          * Check bus_irq boundary.
333          */
334         if (bus_irq >= NR_IRQS_LEGACY) {
335                 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
336                 return;
337         }
338 
339         /*
340          * Convert 'gsi' to 'ioapic.pin'.
341          */
342         ioapic = mp_find_ioapic(gsi);
343         if (ioapic < 0)
344                 return;
345         pin = mp_find_ioapic_pin(ioapic, gsi);
346 
347         /*
348          * TBD: This check is for faulty timer entries, where the override
349          *      erroneously sets the trigger to level, resulting in a HUGE
350          *      increase of timer interrupts!
351          */
352         if ((bus_irq == 0) && (trigger == 3))
353                 trigger = 1;
354 
355         mp_irq.type = MP_INTSRC;
356         mp_irq.irqtype = mp_INT;
357         mp_irq.irqflag = (trigger << 2) | polarity;
358         mp_irq.srcbus = MP_ISA_BUS;
359         mp_irq.srcbusirq = bus_irq;     /* IRQ */
360         mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
361         mp_irq.dstirq = pin;    /* INTIN# */
362 
363         mp_save_irq(&mp_irq);
364 
365         /*
366          * Reset default identity mapping if gsi is also an legacy IRQ,
367          * otherwise there will be more than one entry with the same GSI
368          * and acpi_isa_irq_to_gsi() may give wrong result.
369          */
370         if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
371                 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
372         isa_irq_to_gsi[bus_irq] = gsi;
373 }
374 
375 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
376                         int polarity)
377 {
378 #ifdef CONFIG_X86_MPPARSE
379         struct mpc_intsrc mp_irq;
380         struct pci_dev *pdev;
381         unsigned char number;
382         unsigned int devfn;
383         int ioapic;
384         u8 pin;
385 
386         if (!acpi_ioapic)
387                 return 0;
388         if (!dev || !dev_is_pci(dev))
389                 return 0;
390 
391         pdev = to_pci_dev(dev);
392         number = pdev->bus->number;
393         devfn = pdev->devfn;
394         pin = pdev->pin;
395         /* print the entry should happen on mptable identically */
396         mp_irq.type = MP_INTSRC;
397         mp_irq.irqtype = mp_INT;
398         mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
399                                 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
400         mp_irq.srcbus = number;
401         mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
402         ioapic = mp_find_ioapic(gsi);
403         mp_irq.dstapic = mpc_ioapic_id(ioapic);
404         mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
405 
406         mp_save_irq(&mp_irq);
407 #endif
408         return 0;
409 }
410 
411 static int mp_register_gsi(struct device *dev, u32 gsi, int trigger,
412                            int polarity)
413 {
414         int irq, node;
415 
416         if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
417                 return gsi;
418 
419         trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
420         polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
421         node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
422         if (mp_set_gsi_attr(gsi, trigger, polarity, node)) {
423                 pr_warn("Failed to set pin attr for GSI%d\n", gsi);
424                 return -1;
425         }
426 
427         irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC);
428         if (irq < 0)
429                 return irq;
430 
431         /* Don't set up the ACPI SCI because it's already set up */
432         if (enable_update_mptable && acpi_gbl_FADT.sci_interrupt != gsi)
433                 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
434 
435         return irq;
436 }
437 
438 static void mp_unregister_gsi(u32 gsi)
439 {
440         int irq;
441 
442         if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
443                 return;
444 
445         irq = mp_map_gsi_to_irq(gsi, 0);
446         if (irq > 0)
447                 mp_unmap_irq(irq);
448 }
449 
450 static struct irq_domain_ops acpi_irqdomain_ops = {
451         .map = mp_irqdomain_map,
452         .unmap = mp_irqdomain_unmap,
453 };
454 
455 static int __init
456 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
457 {
458         struct acpi_madt_io_apic *ioapic = NULL;
459         struct ioapic_domain_cfg cfg = {
460                 .type = IOAPIC_DOMAIN_DYNAMIC,
461                 .ops = &acpi_irqdomain_ops,
462         };
463 
464         ioapic = (struct acpi_madt_io_apic *)header;
465 
466         if (BAD_MADT_ENTRY(ioapic, end))
467                 return -EINVAL;
468 
469         acpi_table_print_madt_entry(header);
470 
471         /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
472         if (ioapic->global_irq_base < nr_legacy_irqs())
473                 cfg.type = IOAPIC_DOMAIN_LEGACY;
474 
475         mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
476                            &cfg);
477 
478         return 0;
479 }
480 
481 /*
482  * Parse Interrupt Source Override for the ACPI SCI
483  */
484 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
485 {
486         if (trigger == 0)       /* compatible SCI trigger is level */
487                 trigger = 3;
488 
489         if (polarity == 0)      /* compatible SCI polarity is low */
490                 polarity = 3;
491 
492         /* Command-line over-ride via acpi_sci= */
493         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
494                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
495 
496         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
497                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
498 
499         mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
500         acpi_penalize_sci_irq(bus_irq, trigger, polarity);
501 
502         /*
503          * stash over-ride to indicate we've been here
504          * and for later update of acpi_gbl_FADT
505          */
506         acpi_sci_override_gsi = gsi;
507         return;
508 }
509 
510 static int __init
511 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
512                        const unsigned long end)
513 {
514         struct acpi_madt_interrupt_override *intsrc = NULL;
515 
516         intsrc = (struct acpi_madt_interrupt_override *)header;
517 
518         if (BAD_MADT_ENTRY(intsrc, end))
519                 return -EINVAL;
520 
521         acpi_table_print_madt_entry(header);
522 
523         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
524                 acpi_sci_ioapic_setup(intsrc->source_irq,
525                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
526                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
527                                       intsrc->global_irq);
528                 return 0;
529         }
530 
531         if (intsrc->source_irq == 0) {
532                 if (acpi_skip_timer_override) {
533                         printk(PREFIX "BIOS IRQ0 override ignored.\n");
534                         return 0;
535                 }
536 
537                 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
538                         && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
539                         intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
540                         printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
541                 }
542         }
543 
544         mp_override_legacy_irq(intsrc->source_irq,
545                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
546                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
547                                 intsrc->global_irq);
548 
549         return 0;
550 }
551 
552 static int __init
553 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
554 {
555         struct acpi_madt_nmi_source *nmi_src = NULL;
556 
557         nmi_src = (struct acpi_madt_nmi_source *)header;
558 
559         if (BAD_MADT_ENTRY(nmi_src, end))
560                 return -EINVAL;
561 
562         acpi_table_print_madt_entry(header);
563 
564         /* TBD: Support nimsrc entries? */
565 
566         return 0;
567 }
568 
569 #endif                          /* CONFIG_X86_IO_APIC */
570 
571 /*
572  * acpi_pic_sci_set_trigger()
573  *
574  * use ELCR to set PIC-mode trigger type for SCI
575  *
576  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
577  * it may require Edge Trigger -- use "acpi_sci=edge"
578  *
579  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
580  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
581  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
582  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
583  */
584 
585 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
586 {
587         unsigned int mask = 1 << irq;
588         unsigned int old, new;
589 
590         /* Real old ELCR mask */
591         old = inb(0x4d0) | (inb(0x4d1) << 8);
592 
593         /*
594          * If we use ACPI to set PCI IRQs, then we should clear ELCR
595          * since we will set it correctly as we enable the PCI irq
596          * routing.
597          */
598         new = acpi_noirq ? old : 0;
599 
600         /*
601          * Update SCI information in the ELCR, it isn't in the PCI
602          * routing tables..
603          */
604         switch (trigger) {
605         case 1:         /* Edge - clear */
606                 new &= ~mask;
607                 break;
608         case 3:         /* Level - set */
609                 new |= mask;
610                 break;
611         }
612 
613         if (old == new)
614                 return;
615 
616         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
617         outb(new, 0x4d0);
618         outb(new >> 8, 0x4d1);
619 }
620 
621 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
622 {
623         int rc, irq, trigger, polarity;
624 
625         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
626                 *irqp = gsi;
627                 return 0;
628         }
629 
630         rc = acpi_get_override_irq(gsi, &trigger, &polarity);
631         if (rc == 0) {
632                 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
633                 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
634                 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
635                 if (irq >= 0) {
636                         *irqp = irq;
637                         return 0;
638                 }
639         }
640 
641         return -1;
642 }
643 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
644 
645 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
646 {
647         if (isa_irq < nr_legacy_irqs() &&
648             isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
649                 *gsi = isa_irq_to_gsi[isa_irq];
650                 return 0;
651         }
652 
653         return -1;
654 }
655 
656 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
657                                  int trigger, int polarity)
658 {
659 #ifdef CONFIG_PCI
660         /*
661          * Make sure all (legacy) PCI IRQs are set as level-triggered.
662          */
663         if (trigger == ACPI_LEVEL_SENSITIVE)
664                 eisa_set_level_irq(gsi);
665 #endif
666 
667         return gsi;
668 }
669 
670 #ifdef CONFIG_X86_LOCAL_APIC
671 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
672                                     int trigger, int polarity)
673 {
674         int irq = gsi;
675 
676 #ifdef CONFIG_X86_IO_APIC
677         mutex_lock(&acpi_ioapic_lock);
678         irq = mp_register_gsi(dev, gsi, trigger, polarity);
679         mutex_unlock(&acpi_ioapic_lock);
680 #endif
681 
682         return irq;
683 }
684 
685 static void acpi_unregister_gsi_ioapic(u32 gsi)
686 {
687 #ifdef CONFIG_X86_IO_APIC
688         mutex_lock(&acpi_ioapic_lock);
689         mp_unregister_gsi(gsi);
690         mutex_unlock(&acpi_ioapic_lock);
691 #endif
692 }
693 #endif
694 
695 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
696                            int trigger, int polarity) = acpi_register_gsi_pic;
697 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
698 
699 #ifdef CONFIG_ACPI_SLEEP
700 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
701 #else
702 int (*acpi_suspend_lowlevel)(void);
703 #endif
704 
705 /*
706  * success: return IRQ number (>=0)
707  * failure: return < 0
708  */
709 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
710 {
711         return __acpi_register_gsi(dev, gsi, trigger, polarity);
712 }
713 EXPORT_SYMBOL_GPL(acpi_register_gsi);
714 
715 void acpi_unregister_gsi(u32 gsi)
716 {
717         if (__acpi_unregister_gsi)
718                 __acpi_unregister_gsi(gsi);
719 }
720 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
721 
722 #ifdef CONFIG_X86_LOCAL_APIC
723 static void __init acpi_set_irq_model_ioapic(void)
724 {
725         acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
726         __acpi_register_gsi = acpi_register_gsi_ioapic;
727         __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
728         acpi_ioapic = 1;
729 }
730 #endif
731 
732 /*
733  *  ACPI based hotplug support for CPU
734  */
735 #ifdef CONFIG_ACPI_HOTPLUG_CPU
736 #include <acpi/processor.h>
737 
738 static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
739 {
740 #ifdef CONFIG_ACPI_NUMA
741         int nid;
742 
743         nid = acpi_get_node(handle);
744         if (nid != -1) {
745                 set_apicid_to_node(physid, nid);
746                 numa_set_node(cpu, nid);
747         }
748 #endif
749 }
750 
751 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
752 {
753         int cpu;
754 
755         cpu = acpi_register_lapic(physid, ACPI_MADT_ENABLED);
756         if (cpu < 0) {
757                 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
758                 return cpu;
759         }
760 
761         acpi_processor_set_pdc(handle);
762         acpi_map_cpu2node(handle, cpu, physid);
763 
764         *pcpu = cpu;
765         return 0;
766 }
767 
768 /* wrapper to silence section mismatch warning */
769 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
770 {
771         return _acpi_map_lsapic(handle, physid, pcpu);
772 }
773 EXPORT_SYMBOL(acpi_map_cpu);
774 
775 int acpi_unmap_cpu(int cpu)
776 {
777 #ifdef CONFIG_ACPI_NUMA
778         set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
779 #endif
780 
781         per_cpu(x86_cpu_to_apicid, cpu) = -1;
782         set_cpu_present(cpu, false);
783         num_processors--;
784 
785         return (0);
786 }
787 EXPORT_SYMBOL(acpi_unmap_cpu);
788 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
789 
790 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
791 {
792         int ret = -ENOSYS;
793 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
794         int ioapic_id;
795         u64 addr;
796         struct ioapic_domain_cfg cfg = {
797                 .type = IOAPIC_DOMAIN_DYNAMIC,
798                 .ops = &acpi_irqdomain_ops,
799         };
800 
801         ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
802         if (ioapic_id < 0) {
803                 unsigned long long uid;
804                 acpi_status status;
805 
806                 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
807                                                NULL, &uid);
808                 if (ACPI_FAILURE(status)) {
809                         acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
810                         return -EINVAL;
811                 }
812                 ioapic_id = (int)uid;
813         }
814 
815         mutex_lock(&acpi_ioapic_lock);
816         ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
817         mutex_unlock(&acpi_ioapic_lock);
818 #endif
819 
820         return ret;
821 }
822 EXPORT_SYMBOL(acpi_register_ioapic);
823 
824 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
825 {
826         int ret = -ENOSYS;
827 
828 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
829         mutex_lock(&acpi_ioapic_lock);
830         ret  = mp_unregister_ioapic(gsi_base);
831         mutex_unlock(&acpi_ioapic_lock);
832 #endif
833 
834         return ret;
835 }
836 EXPORT_SYMBOL(acpi_unregister_ioapic);
837 
838 /**
839  * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
840  *                          has been registered
841  * @handle:     ACPI handle of the IOAPIC deivce
842  * @gsi_base:   GSI base associated with the IOAPIC
843  *
844  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
845  * with acpi_register_ioapic()/acpi_unregister_ioapic().
846  */
847 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
848 {
849         int ret = 0;
850 
851 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
852         mutex_lock(&acpi_ioapic_lock);
853         ret  = mp_ioapic_registered(gsi_base);
854         mutex_unlock(&acpi_ioapic_lock);
855 #endif
856 
857         return ret;
858 }
859 
860 static int __init acpi_parse_sbf(struct acpi_table_header *table)
861 {
862         struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
863 
864         sbf_port = sb->cmos_index;      /* Save CMOS port */
865 
866         return 0;
867 }
868 
869 #ifdef CONFIG_HPET_TIMER
870 #include <asm/hpet.h>
871 
872 static struct resource *hpet_res __initdata;
873 
874 static int __init acpi_parse_hpet(struct acpi_table_header *table)
875 {
876         struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
877 
878         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
879                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
880                        "memory.\n");
881                 return -1;
882         }
883 
884         hpet_address = hpet_tbl->address.address;
885         hpet_blockid = hpet_tbl->sequence;
886 
887         /*
888          * Some broken BIOSes advertise HPET at 0x0. We really do not
889          * want to allocate a resource there.
890          */
891         if (!hpet_address) {
892                 printk(KERN_WARNING PREFIX
893                        "HPET id: %#x base: %#lx is invalid\n",
894                        hpet_tbl->id, hpet_address);
895                 return 0;
896         }
897 #ifdef CONFIG_X86_64
898         /*
899          * Some even more broken BIOSes advertise HPET at
900          * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
901          * some noise:
902          */
903         if (hpet_address == 0xfed0000000000000UL) {
904                 if (!hpet_force_user) {
905                         printk(KERN_WARNING PREFIX "HPET id: %#x "
906                                "base: 0xfed0000000000000 is bogus\n "
907                                "try hpet=force on the kernel command line to "
908                                "fix it up to 0xfed00000.\n", hpet_tbl->id);
909                         hpet_address = 0;
910                         return 0;
911                 }
912                 printk(KERN_WARNING PREFIX
913                        "HPET id: %#x base: 0xfed0000000000000 fixed up "
914                        "to 0xfed00000.\n", hpet_tbl->id);
915                 hpet_address >>= 32;
916         }
917 #endif
918         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
919                hpet_tbl->id, hpet_address);
920 
921         /*
922          * Allocate and initialize the HPET firmware resource for adding into
923          * the resource tree during the lateinit timeframe.
924          */
925 #define HPET_RESOURCE_NAME_SIZE 9
926         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
927 
928         hpet_res->name = (void *)&hpet_res[1];
929         hpet_res->flags = IORESOURCE_MEM;
930         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
931                  hpet_tbl->sequence);
932 
933         hpet_res->start = hpet_address;
934         hpet_res->end = hpet_address + (1 * 1024) - 1;
935 
936         return 0;
937 }
938 
939 /*
940  * hpet_insert_resource inserts the HPET resources used into the resource
941  * tree.
942  */
943 static __init int hpet_insert_resource(void)
944 {
945         if (!hpet_res)
946                 return 1;
947 
948         return insert_resource(&iomem_resource, hpet_res);
949 }
950 
951 late_initcall(hpet_insert_resource);
952 
953 #else
954 #define acpi_parse_hpet NULL
955 #endif
956 
957 static int __init acpi_parse_fadt(struct acpi_table_header *table)
958 {
959 
960 #ifdef CONFIG_X86_PM_TIMER
961         /* detect the location of the ACPI PM Timer */
962         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
963                 /* FADT rev. 2 */
964                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
965                     ACPI_ADR_SPACE_SYSTEM_IO)
966                         return 0;
967 
968                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
969                 /*
970                  * "X" fields are optional extensions to the original V1.0
971                  * fields, so we must selectively expand V1.0 fields if the
972                  * corresponding X field is zero.
973                  */
974                 if (!pmtmr_ioport)
975                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
976         } else {
977                 /* FADT rev. 1 */
978                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
979         }
980         if (pmtmr_ioport)
981                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
982                        pmtmr_ioport);
983 #endif
984         return 0;
985 }
986 
987 #ifdef  CONFIG_X86_LOCAL_APIC
988 /*
989  * Parse LAPIC entries in MADT
990  * returns 0 on success, < 0 on error
991  */
992 
993 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
994 {
995         int count;
996 
997         if (!cpu_has_apic)
998                 return -ENODEV;
999 
1000         /*
1001          * Note that the LAPIC address is obtained from the MADT (32-bit value)
1002          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
1003          */
1004 
1005         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1006                                       acpi_parse_lapic_addr_ovr, 0);
1007         if (count < 0) {
1008                 printk(KERN_ERR PREFIX
1009                        "Error parsing LAPIC address override entry\n");
1010                 return count;
1011         }
1012 
1013         register_lapic_address(acpi_lapic_addr);
1014 
1015         return count;
1016 }
1017 
1018 static int __init acpi_parse_madt_lapic_entries(void)
1019 {
1020         int count;
1021         int x2count = 0;
1022 
1023         if (!cpu_has_apic)
1024                 return -ENODEV;
1025 
1026         /*
1027          * Note that the LAPIC address is obtained from the MADT (32-bit value)
1028          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
1029          */
1030 
1031         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1032                                       acpi_parse_lapic_addr_ovr, 0);
1033         if (count < 0) {
1034                 printk(KERN_ERR PREFIX
1035                        "Error parsing LAPIC address override entry\n");
1036                 return count;
1037         }
1038 
1039         register_lapic_address(acpi_lapic_addr);
1040 
1041         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1042                                       acpi_parse_sapic, MAX_LOCAL_APIC);
1043 
1044         if (!count) {
1045                 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
1046                                         acpi_parse_x2apic, MAX_LOCAL_APIC);
1047                 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
1048                                         acpi_parse_lapic, MAX_LOCAL_APIC);
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 (!cpu_has_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 
1601         if (!acpi_noirq)
1602                 x86_init.pci.init = pci_acpi_init;
1603 
1604         return 0;
1605 }
1606 
1607 static int __init parse_acpi(char *arg)
1608 {
1609         if (!arg)
1610                 return -EINVAL;
1611 
1612         /* "acpi=off" disables both ACPI table parsing and interpreter */
1613         if (strcmp(arg, "off") == 0) {
1614                 disable_acpi();
1615         }
1616         /* acpi=force to over-ride black-list */
1617         else if (strcmp(arg, "force") == 0) {
1618                 acpi_force = 1;
1619                 acpi_disabled = 0;
1620         }
1621         /* acpi=strict disables out-of-spec workarounds */
1622         else if (strcmp(arg, "strict") == 0) {
1623                 acpi_strict = 1;
1624         }
1625         /* acpi=rsdt use RSDT instead of XSDT */
1626         else if (strcmp(arg, "rsdt") == 0) {
1627                 acpi_gbl_do_not_use_xsdt = TRUE;
1628         }
1629         /* "acpi=noirq" disables ACPI interrupt routing */
1630         else if (strcmp(arg, "noirq") == 0) {
1631                 acpi_noirq_set();
1632         }
1633         /* "acpi=copy_dsdt" copys DSDT */
1634         else if (strcmp(arg, "copy_dsdt") == 0) {
1635                 acpi_gbl_copy_dsdt_locally = 1;
1636         }
1637         /* "acpi=nocmcff" disables FF mode for corrected errors */
1638         else if (strcmp(arg, "nocmcff") == 0) {
1639                 acpi_disable_cmcff = 1;
1640         } else {
1641                 /* Core will printk when we return error. */
1642                 return -EINVAL;
1643         }
1644         return 0;
1645 }
1646 early_param("acpi", parse_acpi);
1647 
1648 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1649 static int __init parse_pci(char *arg)
1650 {
1651         if (arg && strcmp(arg, "noacpi") == 0)
1652                 acpi_disable_pci();
1653         return 0;
1654 }
1655 early_param("pci", parse_pci);
1656 
1657 int __init acpi_mps_check(void)
1658 {
1659 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1660 /* mptable code is not built-in*/
1661         if (acpi_disabled || acpi_noirq) {
1662                 printk(KERN_WARNING "MPS support code is not built-in.\n"
1663                        "Using acpi=off or acpi=noirq or pci=noacpi "
1664                        "may have problem\n");
1665                 return 1;
1666         }
1667 #endif
1668         return 0;
1669 }
1670 
1671 #ifdef CONFIG_X86_IO_APIC
1672 static int __init parse_acpi_skip_timer_override(char *arg)
1673 {
1674         acpi_skip_timer_override = 1;
1675         return 0;
1676 }
1677 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1678 
1679 static int __init parse_acpi_use_timer_override(char *arg)
1680 {
1681         acpi_use_timer_override = 1;
1682         return 0;
1683 }
1684 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1685 #endif /* CONFIG_X86_IO_APIC */
1686 
1687 static int __init setup_acpi_sci(char *s)
1688 {
1689         if (!s)
1690                 return -EINVAL;
1691         if (!strcmp(s, "edge"))
1692                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1693                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1694         else if (!strcmp(s, "level"))
1695                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1696                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1697         else if (!strcmp(s, "high"))
1698                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1699                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1700         else if (!strcmp(s, "low"))
1701                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1702                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1703         else
1704                 return -EINVAL;
1705         return 0;
1706 }
1707 early_param("acpi_sci", setup_acpi_sci);
1708 
1709 int __acpi_acquire_global_lock(unsigned int *lock)
1710 {
1711         unsigned int old, new, val;
1712         do {
1713                 old = *lock;
1714                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1715                 val = cmpxchg(lock, old, new);
1716         } while (unlikely (val != old));
1717         return (new < 3) ? -1 : 0;
1718 }
1719 
1720 int __acpi_release_global_lock(unsigned int *lock)
1721 {
1722         unsigned int old, new, val;
1723         do {
1724                 old = *lock;
1725                 new = old & ~0x3;
1726                 val = cmpxchg(lock, old, new);
1727         } while (unlikely (val != old));
1728         return old & 0x1;
1729 }
1730 
1731 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1732 {
1733         e820_add_region(addr, size, E820_ACPI);
1734         update_e820();
1735 }
1736 

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