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

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  1 /*
  2  *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
  3  *
  4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  5  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
  6  *
  7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  8  *
  9  *  This program is free software; you can redistribute it and/or modify
 10  *  it under the terms of the GNU General Public License as published by
 11  *  the Free Software Foundation; either version 2 of the License, or
 12  *  (at your option) any later version.
 13  *
 14  *  This program is distributed in the hope that it will be useful,
 15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  *  GNU General Public License for more details.
 18  *
 19  *  You should have received a copy of the GNU General Public License
 20  *  along with this program; if not, write to the Free Software
 21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 22  *
 23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 24  */
 25 
 26 #include <linux/init.h>
 27 #include <linux/acpi.h>
 28 #include <linux/acpi_pmtmr.h>
 29 #include <linux/efi.h>
 30 #include <linux/cpumask.h>
 31 #include <linux/export.h>
 32 #include <linux/dmi.h>
 33 #include <linux/irq.h>
 34 #include <linux/slab.h>
 35 #include <linux/memblock.h>
 36 #include <linux/ioport.h>
 37 #include <linux/pci.h>
 38 #include <linux/efi-bgrt.h>
 39 #include <linux/serial_core.h>
 40 
 41 #include <asm/e820/api.h>
 42 #include <asm/irqdomain.h>
 43 #include <asm/pci_x86.h>
 44 #include <asm/pgtable.h>
 45 #include <asm/io_apic.h>
 46 #include <asm/apic.h>
 47 #include <asm/io.h>
 48 #include <asm/mpspec.h>
 49 #include <asm/smp.h>
 50 #include <asm/i8259.h>
 51 #include <asm/setup.h>
 52 
 53 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
 54 static int __initdata acpi_force = 0;
 55 int acpi_disabled;
 56 EXPORT_SYMBOL(acpi_disabled);
 57 
 58 #ifdef  CONFIG_X86_64
 59 # include <asm/proto.h>
 60 #endif                          /* X86 */
 61 
 62 #define PREFIX                  "ACPI: "
 63 
 64 int acpi_noirq;                         /* skip ACPI IRQ initialization */
 65 int acpi_pci_disabled;          /* skip ACPI PCI scan and IRQ initialization */
 66 EXPORT_SYMBOL(acpi_pci_disabled);
 67 
 68 int acpi_lapic;
 69 int acpi_ioapic;
 70 int acpi_strict;
 71 int acpi_disable_cmcff;
 72 
 73 /* ACPI SCI override configuration */
 74 u8 acpi_sci_flags __initdata;
 75 u32 acpi_sci_override_gsi __initdata = INVALID_ACPI_IRQ;
 76 int acpi_skip_timer_override __initdata;
 77 int acpi_use_timer_override __initdata;
 78 int acpi_fix_pin2_polarity __initdata;
 79 
 80 #ifdef CONFIG_X86_LOCAL_APIC
 81 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
 82 #endif
 83 
 84 #ifdef CONFIG_X86_IO_APIC
 85 /*
 86  * Locks related to IOAPIC hotplug
 87  * Hotplug side:
 88  *      ->device_hotplug_lock
 89  *              ->acpi_ioapic_lock
 90  *                      ->ioapic_lock
 91  * Interrupt mapping side:
 92  *      ->acpi_ioapic_lock
 93  *              ->ioapic_mutex
 94  *                      ->ioapic_lock
 95  */
 96 static DEFINE_MUTEX(acpi_ioapic_lock);
 97 #endif
 98 
 99 /* --------------------------------------------------------------------------
100                               Boot-time Configuration
101    -------------------------------------------------------------------------- */
102 
103 /*
104  * The default interrupt routing model is PIC (8259).  This gets
105  * overridden if IOAPICs are enumerated (below).
106  */
107 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
108 
109 
110 /*
111  * ISA irqs by default are the first 16 gsis but can be
112  * any gsi as specified by an interrupt source override.
113  */
114 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
115         0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
116 };
117 
118 /*
119  * This is just a simple wrapper around early_memremap(),
120  * with sanity checks for phys == 0 and size == 0.
121  */
122 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
123 {
124 
125         if (!phys || !size)
126                 return NULL;
127 
128         return early_memremap(phys, size);
129 }
130 
131 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
132 {
133         if (!map || !size)
134                 return;
135 
136         early_memunmap(map, size);
137 }
138 
139 #ifdef CONFIG_X86_LOCAL_APIC
140 static int __init acpi_parse_madt(struct acpi_table_header *table)
141 {
142         struct acpi_table_madt *madt = NULL;
143 
144         if (!boot_cpu_has(X86_FEATURE_APIC))
145                 return -EINVAL;
146 
147         madt = (struct acpi_table_madt *)table;
148         if (!madt) {
149                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
150                 return -ENODEV;
151         }
152 
153         if (madt->address) {
154                 acpi_lapic_addr = (u64) madt->address;
155 
156                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
157                        madt->address);
158         }
159 
160         default_acpi_madt_oem_check(madt->header.oem_id,
161                                     madt->header.oem_table_id);
162 
163         return 0;
164 }
165 
166 /**
167  * acpi_register_lapic - register a local apic and generates a logic cpu number
168  * @id: local apic id to register
169  * @acpiid: ACPI id to register
170  * @enabled: this cpu is enabled or not
171  *
172  * Returns the logic cpu number which maps to the local apic
173  */
174 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
175 {
176         unsigned int ver = 0;
177         int cpu;
178 
179         if (id >= MAX_LOCAL_APIC) {
180                 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
181                 return -EINVAL;
182         }
183 
184         if (!enabled) {
185                 ++disabled_cpus;
186                 return -EINVAL;
187         }
188 
189         if (boot_cpu_physical_apicid != -1U)
190                 ver = boot_cpu_apic_version;
191 
192         cpu = generic_processor_info(id, ver);
193         if (cpu >= 0)
194                 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
195 
196         return cpu;
197 }
198 
199 static int __init
200 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
201 {
202         struct acpi_madt_local_x2apic *processor = NULL;
203 #ifdef CONFIG_X86_X2APIC
204         u32 apic_id;
205         u8 enabled;
206 #endif
207 
208         processor = (struct acpi_madt_local_x2apic *)header;
209 
210         if (BAD_MADT_ENTRY(processor, end))
211                 return -EINVAL;
212 
213         acpi_table_print_madt_entry(header);
214 
215 #ifdef CONFIG_X86_X2APIC
216         apic_id = processor->local_apic_id;
217         enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
218 
219         /* Ignore invalid ID */
220         if (apic_id == 0xffffffff)
221                 return 0;
222 
223         /*
224          * We need to register disabled CPU as well to permit
225          * counting disabled CPUs. This allows us to size
226          * cpus_possible_map more accurately, to permit
227          * to not preallocating memory for all NR_CPUS
228          * when we use CPU hotplug.
229          */
230         if (!apic->apic_id_valid(apic_id)) {
231                 if (enabled)
232                         pr_warn(PREFIX "x2apic entry ignored\n");
233                 return 0;
234         }
235 
236         acpi_register_lapic(apic_id, processor->uid, enabled);
237 #else
238         printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
239 #endif
240 
241         return 0;
242 }
243 
244 static int __init
245 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
246 {
247         struct acpi_madt_local_apic *processor = NULL;
248 
249         processor = (struct acpi_madt_local_apic *)header;
250 
251         if (BAD_MADT_ENTRY(processor, end))
252                 return -EINVAL;
253 
254         acpi_table_print_madt_entry(header);
255 
256         /* Ignore invalid ID */
257         if (processor->id == 0xff)
258                 return 0;
259 
260         /*
261          * We need to register disabled CPU as well to permit
262          * counting disabled CPUs. This allows us to size
263          * cpus_possible_map more accurately, to permit
264          * to not preallocating memory for all NR_CPUS
265          * when we use CPU hotplug.
266          */
267         acpi_register_lapic(processor->id,      /* APIC ID */
268                             processor->processor_id, /* ACPI ID */
269                             processor->lapic_flags & ACPI_MADT_ENABLED);
270 
271         return 0;
272 }
273 
274 static int __init
275 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
276 {
277         struct acpi_madt_local_sapic *processor = NULL;
278 
279         processor = (struct acpi_madt_local_sapic *)header;
280 
281         if (BAD_MADT_ENTRY(processor, end))
282                 return -EINVAL;
283 
284         acpi_table_print_madt_entry(header);
285 
286         acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
287                             processor->processor_id, /* ACPI ID */
288                             processor->lapic_flags & ACPI_MADT_ENABLED);
289 
290         return 0;
291 }
292 
293 static int __init
294 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
295                           const unsigned long end)
296 {
297         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
298 
299         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
300 
301         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
302                 return -EINVAL;
303 
304         acpi_table_print_madt_entry(header);
305 
306         acpi_lapic_addr = lapic_addr_ovr->address;
307 
308         return 0;
309 }
310 
311 static int __init
312 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
313                       const unsigned long end)
314 {
315         struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
316 
317         x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
318 
319         if (BAD_MADT_ENTRY(x2apic_nmi, end))
320                 return -EINVAL;
321 
322         acpi_table_print_madt_entry(header);
323 
324         if (x2apic_nmi->lint != 1)
325                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
326 
327         return 0;
328 }
329 
330 static int __init
331 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
332 {
333         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
334 
335         lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
336 
337         if (BAD_MADT_ENTRY(lapic_nmi, end))
338                 return -EINVAL;
339 
340         acpi_table_print_madt_entry(header);
341 
342         if (lapic_nmi->lint != 1)
343                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
344 
345         return 0;
346 }
347 
348 #endif                          /*CONFIG_X86_LOCAL_APIC */
349 
350 #ifdef CONFIG_X86_IO_APIC
351 #define MP_ISA_BUS              0
352 
353 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
354                                                 u8 trigger, u32 gsi);
355 
356 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
357                                           u32 gsi)
358 {
359         /*
360          * Check bus_irq boundary.
361          */
362         if (bus_irq >= NR_IRQS_LEGACY) {
363                 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
364                 return;
365         }
366 
367         /*
368          * TBD: This check is for faulty timer entries, where the override
369          *      erroneously sets the trigger to level, resulting in a HUGE
370          *      increase of timer interrupts!
371          */
372         if ((bus_irq == 0) && (trigger == 3))
373                 trigger = 1;
374 
375         if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
376                 return;
377         /*
378          * Reset default identity mapping if gsi is also an legacy IRQ,
379          * otherwise there will be more than one entry with the same GSI
380          * and acpi_isa_irq_to_gsi() may give wrong result.
381          */
382         if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
383                 isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
384         isa_irq_to_gsi[bus_irq] = gsi;
385 }
386 
387 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
388                         int polarity)
389 {
390 #ifdef CONFIG_X86_MPPARSE
391         struct mpc_intsrc mp_irq;
392         struct pci_dev *pdev;
393         unsigned char number;
394         unsigned int devfn;
395         int ioapic;
396         u8 pin;
397 
398         if (!acpi_ioapic)
399                 return 0;
400         if (!dev || !dev_is_pci(dev))
401                 return 0;
402 
403         pdev = to_pci_dev(dev);
404         number = pdev->bus->number;
405         devfn = pdev->devfn;
406         pin = pdev->pin;
407         /* print the entry should happen on mptable identically */
408         mp_irq.type = MP_INTSRC;
409         mp_irq.irqtype = mp_INT;
410         mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
411                                 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
412         mp_irq.srcbus = number;
413         mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
414         ioapic = mp_find_ioapic(gsi);
415         mp_irq.dstapic = mpc_ioapic_id(ioapic);
416         mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
417 
418         mp_save_irq(&mp_irq);
419 #endif
420         return 0;
421 }
422 
423 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
424                                                 u8 trigger, u32 gsi)
425 {
426         struct mpc_intsrc mp_irq;
427         int ioapic, pin;
428 
429         /* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
430         ioapic = mp_find_ioapic(gsi);
431         if (ioapic < 0) {
432                 pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
433                 return ioapic;
434         }
435 
436         pin = mp_find_ioapic_pin(ioapic, gsi);
437 
438         mp_irq.type = MP_INTSRC;
439         mp_irq.irqtype = mp_INT;
440         mp_irq.irqflag = (trigger << 2) | polarity;
441         mp_irq.srcbus = MP_ISA_BUS;
442         mp_irq.srcbusirq = bus_irq;
443         mp_irq.dstapic = mpc_ioapic_id(ioapic);
444         mp_irq.dstirq = pin;
445 
446         mp_save_irq(&mp_irq);
447 
448         return 0;
449 }
450 
451 static int __init
452 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
453 {
454         struct acpi_madt_io_apic *ioapic = NULL;
455         struct ioapic_domain_cfg cfg = {
456                 .type = IOAPIC_DOMAIN_DYNAMIC,
457                 .ops = &mp_ioapic_irqdomain_ops,
458         };
459 
460         ioapic = (struct acpi_madt_io_apic *)header;
461 
462         if (BAD_MADT_ENTRY(ioapic, end))
463                 return -EINVAL;
464 
465         acpi_table_print_madt_entry(header);
466 
467         /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
468         if (ioapic->global_irq_base < nr_legacy_irqs())
469                 cfg.type = IOAPIC_DOMAIN_LEGACY;
470 
471         mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
472                            &cfg);
473 
474         return 0;
475 }
476 
477 /*
478  * Parse Interrupt Source Override for the ACPI SCI
479  */
480 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
481 {
482         if (trigger == 0)       /* compatible SCI trigger is level */
483                 trigger = 3;
484 
485         if (polarity == 0)      /* compatible SCI polarity is low */
486                 polarity = 3;
487 
488         /* Command-line over-ride via acpi_sci= */
489         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
490                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
491 
492         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
493                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
494 
495         if (bus_irq < NR_IRQS_LEGACY)
496                 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
497         else
498                 mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
499 
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)
632                 return rc;
633 
634         trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
635         polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
636         irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
637         if (irq < 0)
638                 return irq;
639 
640         *irqp = irq;
641         return 0;
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] != INVALID_ACPI_IRQ) {
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                 elcr_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 #ifdef CONFIG_X86_IO_APIC
676         int node;
677         struct irq_alloc_info info;
678 
679         node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
680         trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
681         polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
682         ioapic_set_alloc_attr(&info, node, trigger, polarity);
683 
684         mutex_lock(&acpi_ioapic_lock);
685         irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
686         /* Don't set up the ACPI SCI because it's already set up */
687         if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
688                 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
689         mutex_unlock(&acpi_ioapic_lock);
690 #endif
691 
692         return irq;
693 }
694 
695 static void acpi_unregister_gsi_ioapic(u32 gsi)
696 {
697 #ifdef CONFIG_X86_IO_APIC
698         int irq;
699 
700         mutex_lock(&acpi_ioapic_lock);
701         irq = mp_map_gsi_to_irq(gsi, 0, NULL);
702         if (irq > 0)
703                 mp_unmap_irq(irq);
704         mutex_unlock(&acpi_ioapic_lock);
705 #endif
706 }
707 #endif
708 
709 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
710                            int trigger, int polarity) = acpi_register_gsi_pic;
711 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
712 
713 #ifdef CONFIG_ACPI_SLEEP
714 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
715 #else
716 int (*acpi_suspend_lowlevel)(void);
717 #endif
718 
719 /*
720  * success: return IRQ number (>=0)
721  * failure: return < 0
722  */
723 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
724 {
725         return __acpi_register_gsi(dev, gsi, trigger, polarity);
726 }
727 EXPORT_SYMBOL_GPL(acpi_register_gsi);
728 
729 void acpi_unregister_gsi(u32 gsi)
730 {
731         if (__acpi_unregister_gsi)
732                 __acpi_unregister_gsi(gsi);
733 }
734 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
735 
736 #ifdef CONFIG_X86_LOCAL_APIC
737 static void __init acpi_set_irq_model_ioapic(void)
738 {
739         acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
740         __acpi_register_gsi = acpi_register_gsi_ioapic;
741         __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
742         acpi_ioapic = 1;
743 }
744 #endif
745 
746 /*
747  *  ACPI based hotplug support for CPU
748  */
749 #ifdef CONFIG_ACPI_HOTPLUG_CPU
750 #include <acpi/processor.h>
751 
752 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
753 {
754 #ifdef CONFIG_ACPI_NUMA
755         int nid;
756 
757         nid = acpi_get_node(handle);
758         if (nid != NUMA_NO_NODE) {
759                 set_apicid_to_node(physid, nid);
760                 numa_set_node(cpu, nid);
761         }
762 #endif
763         return 0;
764 }
765 
766 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
767                  int *pcpu)
768 {
769         int cpu;
770 
771         cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
772         if (cpu < 0) {
773                 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
774                 return cpu;
775         }
776 
777         acpi_processor_set_pdc(handle);
778         acpi_map_cpu2node(handle, cpu, physid);
779 
780         *pcpu = cpu;
781         return 0;
782 }
783 EXPORT_SYMBOL(acpi_map_cpu);
784 
785 int acpi_unmap_cpu(int cpu)
786 {
787 #ifdef CONFIG_ACPI_NUMA
788         set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
789 #endif
790 
791         per_cpu(x86_cpu_to_apicid, cpu) = -1;
792         set_cpu_present(cpu, false);
793         num_processors--;
794 
795         return (0);
796 }
797 EXPORT_SYMBOL(acpi_unmap_cpu);
798 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
799 
800 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
801 {
802         int ret = -ENOSYS;
803 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
804         int ioapic_id;
805         u64 addr;
806         struct ioapic_domain_cfg cfg = {
807                 .type = IOAPIC_DOMAIN_DYNAMIC,
808                 .ops = &mp_ioapic_irqdomain_ops,
809         };
810 
811         ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
812         if (ioapic_id < 0) {
813                 unsigned long long uid;
814                 acpi_status status;
815 
816                 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
817                                                NULL, &uid);
818                 if (ACPI_FAILURE(status)) {
819                         acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
820                         return -EINVAL;
821                 }
822                 ioapic_id = (int)uid;
823         }
824 
825         mutex_lock(&acpi_ioapic_lock);
826         ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
827         mutex_unlock(&acpi_ioapic_lock);
828 #endif
829 
830         return ret;
831 }
832 EXPORT_SYMBOL(acpi_register_ioapic);
833 
834 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
835 {
836         int ret = -ENOSYS;
837 
838 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
839         mutex_lock(&acpi_ioapic_lock);
840         ret  = mp_unregister_ioapic(gsi_base);
841         mutex_unlock(&acpi_ioapic_lock);
842 #endif
843 
844         return ret;
845 }
846 EXPORT_SYMBOL(acpi_unregister_ioapic);
847 
848 /**
849  * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
850  *                          has been registered
851  * @handle:     ACPI handle of the IOAPIC deivce
852  * @gsi_base:   GSI base associated with the IOAPIC
853  *
854  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
855  * with acpi_register_ioapic()/acpi_unregister_ioapic().
856  */
857 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
858 {
859         int ret = 0;
860 
861 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
862         mutex_lock(&acpi_ioapic_lock);
863         ret  = mp_ioapic_registered(gsi_base);
864         mutex_unlock(&acpi_ioapic_lock);
865 #endif
866 
867         return ret;
868 }
869 
870 static int __init acpi_parse_sbf(struct acpi_table_header *table)
871 {
872         struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
873 
874         sbf_port = sb->cmos_index;      /* Save CMOS port */
875 
876         return 0;
877 }
878 
879 #ifdef CONFIG_HPET_TIMER
880 #include <asm/hpet.h>
881 
882 static struct resource *hpet_res __initdata;
883 
884 static int __init acpi_parse_hpet(struct acpi_table_header *table)
885 {
886         struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
887 
888         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
889                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
890                        "memory.\n");
891                 return -1;
892         }
893 
894         hpet_address = hpet_tbl->address.address;
895         hpet_blockid = hpet_tbl->sequence;
896 
897         /*
898          * Some broken BIOSes advertise HPET at 0x0. We really do not
899          * want to allocate a resource there.
900          */
901         if (!hpet_address) {
902                 printk(KERN_WARNING PREFIX
903                        "HPET id: %#x base: %#lx is invalid\n",
904                        hpet_tbl->id, hpet_address);
905                 return 0;
906         }
907 #ifdef CONFIG_X86_64
908         /*
909          * Some even more broken BIOSes advertise HPET at
910          * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
911          * some noise:
912          */
913         if (hpet_address == 0xfed0000000000000UL) {
914                 if (!hpet_force_user) {
915                         printk(KERN_WARNING PREFIX "HPET id: %#x "
916                                "base: 0xfed0000000000000 is bogus\n "
917                                "try hpet=force on the kernel command line to "
918                                "fix it up to 0xfed00000.\n", hpet_tbl->id);
919                         hpet_address = 0;
920                         return 0;
921                 }
922                 printk(KERN_WARNING PREFIX
923                        "HPET id: %#x base: 0xfed0000000000000 fixed up "
924                        "to 0xfed00000.\n", hpet_tbl->id);
925                 hpet_address >>= 32;
926         }
927 #endif
928         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
929                hpet_tbl->id, hpet_address);
930 
931         /*
932          * Allocate and initialize the HPET firmware resource for adding into
933          * the resource tree during the lateinit timeframe.
934          */
935 #define HPET_RESOURCE_NAME_SIZE 9
936         hpet_res = memblock_alloc(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE,
937                                   SMP_CACHE_BYTES);
938 
939         hpet_res->name = (void *)&hpet_res[1];
940         hpet_res->flags = IORESOURCE_MEM;
941         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
942                  hpet_tbl->sequence);
943 
944         hpet_res->start = hpet_address;
945         hpet_res->end = hpet_address + (1 * 1024) - 1;
946 
947         return 0;
948 }
949 
950 /*
951  * hpet_insert_resource inserts the HPET resources used into the resource
952  * tree.
953  */
954 static __init int hpet_insert_resource(void)
955 {
956         if (!hpet_res)
957                 return 1;
958 
959         return insert_resource(&iomem_resource, hpet_res);
960 }
961 
962 late_initcall(hpet_insert_resource);
963 
964 #else
965 #define acpi_parse_hpet NULL
966 #endif
967 
968 static int __init acpi_parse_fadt(struct acpi_table_header *table)
969 {
970         if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
971                 pr_debug("ACPI: no legacy devices present\n");
972                 x86_platform.legacy.devices.pnpbios = 0;
973         }
974 
975         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
976             !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
977             x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
978                 pr_debug("ACPI: i8042 controller is absent\n");
979                 x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
980         }
981 
982         if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
983                 pr_debug("ACPI: not registering RTC platform device\n");
984                 x86_platform.legacy.rtc = 0;
985         }
986 
987         if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
988                 pr_debug("ACPI: probing for VGA not safe\n");
989                 x86_platform.legacy.no_vga = 1;
990         }
991 
992 #ifdef CONFIG_X86_PM_TIMER
993         /* detect the location of the ACPI PM Timer */
994         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
995                 /* FADT rev. 2 */
996                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
997                     ACPI_ADR_SPACE_SYSTEM_IO)
998                         return 0;
999 
1000                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
1001                 /*
1002                  * "X" fields are optional extensions to the original V1.0
1003                  * fields, so we must selectively expand V1.0 fields if the
1004                  * corresponding X field is zero.
1005                  */
1006                 if (!pmtmr_ioport)
1007                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1008         } else {
1009                 /* FADT rev. 1 */
1010                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1011         }
1012         if (pmtmr_ioport)
1013                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
1014                        pmtmr_ioport);
1015 #endif
1016         return 0;
1017 }
1018 
1019 #ifdef  CONFIG_X86_LOCAL_APIC
1020 /*
1021  * Parse LAPIC entries in MADT
1022  * returns 0 on success, < 0 on error
1023  */
1024 
1025 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
1026 {
1027         int count;
1028 
1029         if (!boot_cpu_has(X86_FEATURE_APIC))
1030                 return -ENODEV;
1031 
1032         /*
1033          * Note that the LAPIC address is obtained from the MADT (32-bit value)
1034          * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1035          */
1036 
1037         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1038                                       acpi_parse_lapic_addr_ovr, 0);
1039         if (count < 0) {
1040                 printk(KERN_ERR PREFIX
1041                        "Error parsing LAPIC address override entry\n");
1042                 return count;
1043         }
1044 
1045         register_lapic_address(acpi_lapic_addr);
1046 
1047         return count;
1048 }
1049 
1050 static int __init acpi_parse_madt_lapic_entries(void)
1051 {
1052         int count;
1053         int x2count = 0;
1054         int ret;
1055         struct acpi_subtable_proc madt_proc[2];
1056 
1057         if (!boot_cpu_has(X86_FEATURE_APIC))
1058                 return -ENODEV;
1059 
1060         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1061                                       acpi_parse_sapic, MAX_LOCAL_APIC);
1062 
1063         if (!count) {
1064                 memset(madt_proc, 0, sizeof(madt_proc));
1065                 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1066                 madt_proc[0].handler = acpi_parse_lapic;
1067                 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1068                 madt_proc[1].handler = acpi_parse_x2apic;
1069                 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1070                                 sizeof(struct acpi_table_madt),
1071                                 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1072                 if (ret < 0) {
1073                         printk(KERN_ERR PREFIX
1074                                         "Error parsing LAPIC/X2APIC entries\n");
1075                         return ret;
1076                 }
1077 
1078                 count = madt_proc[0].count;
1079                 x2count = madt_proc[1].count;
1080         }
1081         if (!count && !x2count) {
1082                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1083                 /* TBD: Cleanup to allow fallback to MPS */
1084                 return -ENODEV;
1085         } else if (count < 0 || x2count < 0) {
1086                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1087                 /* TBD: Cleanup to allow fallback to MPS */
1088                 return count;
1089         }
1090 
1091         x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1092                                         acpi_parse_x2apic_nmi, 0);
1093         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1094                                       acpi_parse_lapic_nmi, 0);
1095         if (count < 0 || x2count < 0) {
1096                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1097                 /* TBD: Cleanup to allow fallback to MPS */
1098                 return count;
1099         }
1100         return 0;
1101 }
1102 #endif                          /* CONFIG_X86_LOCAL_APIC */
1103 
1104 #ifdef  CONFIG_X86_IO_APIC
1105 static void __init mp_config_acpi_legacy_irqs(void)
1106 {
1107         int i;
1108         struct mpc_intsrc mp_irq;
1109 
1110 #ifdef CONFIG_EISA
1111         /*
1112          * Fabricate the legacy ISA bus (bus #31).
1113          */
1114         mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1115 #endif
1116         set_bit(MP_ISA_BUS, mp_bus_not_pci);
1117         pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());
1118 
1119         /*
1120          * Use the default configuration for the IRQs 0-15.  Unless
1121          * overridden by (MADT) interrupt source override entries.
1122          */
1123         for (i = 0; i < nr_legacy_irqs(); i++) {
1124                 int ioapic, pin;
1125                 unsigned int dstapic;
1126                 int idx;
1127                 u32 gsi;
1128 
1129                 /* Locate the gsi that irq i maps to. */
1130                 if (acpi_isa_irq_to_gsi(i, &gsi))
1131                         continue;
1132 
1133                 /*
1134                  * Locate the IOAPIC that manages the ISA IRQ.
1135                  */
1136                 ioapic = mp_find_ioapic(gsi);
1137                 if (ioapic < 0)
1138                         continue;
1139                 pin = mp_find_ioapic_pin(ioapic, gsi);
1140                 dstapic = mpc_ioapic_id(ioapic);
1141 
1142                 for (idx = 0; idx < mp_irq_entries; idx++) {
1143                         struct mpc_intsrc *irq = mp_irqs + idx;
1144 
1145                         /* Do we already have a mapping for this ISA IRQ? */
1146                         if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1147                                 break;
1148 
1149                         /* Do we already have a mapping for this IOAPIC pin */
1150                         if (irq->dstapic == dstapic && irq->dstirq == pin)
1151                                 break;
1152                 }
1153 
1154                 if (idx != mp_irq_entries) {
1155                         printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1156                         continue;       /* IRQ already used */
1157                 }
1158 
1159                 mp_irq.type = MP_INTSRC;
1160                 mp_irq.irqflag = 0;     /* Conforming */
1161                 mp_irq.srcbus = MP_ISA_BUS;
1162                 mp_irq.dstapic = dstapic;
1163                 mp_irq.irqtype = mp_INT;
1164                 mp_irq.srcbusirq = i; /* Identity mapped */
1165                 mp_irq.dstirq = pin;
1166 
1167                 mp_save_irq(&mp_irq);
1168         }
1169 }
1170 
1171 /*
1172  * Parse IOAPIC related entries in MADT
1173  * returns 0 on success, < 0 on error
1174  */
1175 static int __init acpi_parse_madt_ioapic_entries(void)
1176 {
1177         int count;
1178 
1179         /*
1180          * ACPI interpreter is required to complete interrupt setup,
1181          * so if it is off, don't enumerate the io-apics with ACPI.
1182          * If MPS is present, it will handle them,
1183          * otherwise the system will stay in PIC mode
1184          */
1185         if (acpi_disabled || acpi_noirq)
1186                 return -ENODEV;
1187 
1188         if (!boot_cpu_has(X86_FEATURE_APIC))
1189                 return -ENODEV;
1190 
1191         /*
1192          * if "noapic" boot option, don't look for IO-APICs
1193          */
1194         if (skip_ioapic_setup) {
1195                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1196                        "due to 'noapic' option.\n");
1197                 return -ENODEV;
1198         }
1199 
1200         count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1201                                       MAX_IO_APICS);
1202         if (!count) {
1203                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1204                 return -ENODEV;
1205         } else if (count < 0) {
1206                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1207                 return count;
1208         }
1209 
1210         count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1211                                       acpi_parse_int_src_ovr, nr_irqs);
1212         if (count < 0) {
1213                 printk(KERN_ERR PREFIX
1214                        "Error parsing interrupt source overrides entry\n");
1215                 /* TBD: Cleanup to allow fallback to MPS */
1216                 return count;
1217         }
1218 
1219         /*
1220          * If BIOS did not supply an INT_SRC_OVR for the SCI
1221          * pretend we got one so we can set the SCI flags.
1222          * But ignore setting up SCI on hardware reduced platforms.
1223          */
1224         if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
1225                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1226                                       acpi_gbl_FADT.sci_interrupt);
1227 
1228         /* Fill in identity legacy mappings where no override */
1229         mp_config_acpi_legacy_irqs();
1230 
1231         count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1232                                       acpi_parse_nmi_src, nr_irqs);
1233         if (count < 0) {
1234                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1235                 /* TBD: Cleanup to allow fallback to MPS */
1236                 return count;
1237         }
1238 
1239         return 0;
1240 }
1241 #else
1242 static inline int acpi_parse_madt_ioapic_entries(void)
1243 {
1244         return -1;
1245 }
1246 #endif  /* !CONFIG_X86_IO_APIC */
1247 
1248 static void __init early_acpi_process_madt(void)
1249 {
1250 #ifdef CONFIG_X86_LOCAL_APIC
1251         int error;
1252 
1253         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1254 
1255                 /*
1256                  * Parse MADT LAPIC entries
1257                  */
1258                 error = early_acpi_parse_madt_lapic_addr_ovr();
1259                 if (!error) {
1260                         acpi_lapic = 1;
1261                         smp_found_config = 1;
1262                 }
1263                 if (error == -EINVAL) {
1264                         /*
1265                          * Dell Precision Workstation 410, 610 come here.
1266                          */
1267                         printk(KERN_ERR PREFIX
1268                                "Invalid BIOS MADT, disabling ACPI\n");
1269                         disable_acpi();
1270                 }
1271         }
1272 #endif
1273 }
1274 
1275 static void __init acpi_process_madt(void)
1276 {
1277 #ifdef CONFIG_X86_LOCAL_APIC
1278         int error;
1279 
1280         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1281 
1282                 /*
1283                  * Parse MADT LAPIC entries
1284                  */
1285                 error = acpi_parse_madt_lapic_entries();
1286                 if (!error) {
1287                         acpi_lapic = 1;
1288 
1289                         /*
1290                          * Parse MADT IO-APIC entries
1291                          */
1292                         mutex_lock(&acpi_ioapic_lock);
1293                         error = acpi_parse_madt_ioapic_entries();
1294                         mutex_unlock(&acpi_ioapic_lock);
1295                         if (!error) {
1296                                 acpi_set_irq_model_ioapic();
1297 
1298                                 smp_found_config = 1;
1299                         }
1300                 }
1301                 if (error == -EINVAL) {
1302                         /*
1303                          * Dell Precision Workstation 410, 610 come here.
1304                          */
1305                         printk(KERN_ERR PREFIX
1306                                "Invalid BIOS MADT, disabling ACPI\n");
1307                         disable_acpi();
1308                 }
1309         } else {
1310                 /*
1311                  * ACPI found no MADT, and so ACPI wants UP PIC mode.
1312                  * In the event an MPS table was found, forget it.
1313                  * Boot with "acpi=off" to use MPS on such a system.
1314                  */
1315                 if (smp_found_config) {
1316                         printk(KERN_WARNING PREFIX
1317                                 "No APIC-table, disabling MPS\n");
1318                         smp_found_config = 0;
1319                 }
1320         }
1321 
1322         /*
1323          * ACPI supports both logical (e.g. Hyper-Threading) and physical
1324          * processors, where MPS only supports physical.
1325          */
1326         if (acpi_lapic && acpi_ioapic)
1327                 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1328                        "information\n");
1329         else if (acpi_lapic)
1330                 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1331                        "configuration information\n");
1332 #endif
1333         return;
1334 }
1335 
1336 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1337 {
1338         if (!acpi_force) {
1339                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1340                        d->ident);
1341                 acpi_noirq_set();
1342         }
1343         return 0;
1344 }
1345 
1346 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1347 {
1348         if (!acpi_force) {
1349                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1350                        d->ident);
1351                 acpi_disable_pci();
1352         }
1353         return 0;
1354 }
1355 
1356 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1357 {
1358         if (!acpi_force) {
1359                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1360                 disable_acpi();
1361         } else {
1362                 printk(KERN_NOTICE
1363                        "Warning: DMI blacklist says broken, but acpi forced\n");
1364         }
1365         return 0;
1366 }
1367 
1368 /*
1369  * Force ignoring BIOS IRQ0 override
1370  */
1371 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1372 {
1373         if (!acpi_skip_timer_override) {
1374                 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1375                         d->ident);
1376                 acpi_skip_timer_override = 1;
1377         }
1378         return 0;
1379 }
1380 
1381 /*
1382  * ACPI offers an alternative platform interface model that removes
1383  * ACPI hardware requirements for platforms that do not implement
1384  * the PC Architecture.
1385  *
1386  * We initialize the Hardware-reduced ACPI model here:
1387  */
1388 void __init acpi_generic_reduced_hw_init(void)
1389 {
1390         /*
1391          * Override x86_init functions and bypass legacy PIC in
1392          * hardware reduced ACPI mode.
1393          */
1394         x86_init.timers.timer_init      = x86_init_noop;
1395         x86_init.irqs.pre_vector_init   = x86_init_noop;
1396         legacy_pic                      = &null_legacy_pic;
1397 }
1398 
1399 static void __init acpi_reduced_hw_init(void)
1400 {
1401         if (acpi_gbl_reduced_hardware)
1402                 x86_init.acpi.reduced_hw_early_init();
1403 }
1404 
1405 /*
1406  * If your system is blacklisted here, but you find that acpi=force
1407  * works for you, please contact linux-acpi@vger.kernel.org
1408  */
1409 static const struct dmi_system_id acpi_dmi_table[] __initconst = {
1410         /*
1411          * Boxes that need ACPI disabled
1412          */
1413         {
1414          .callback = dmi_disable_acpi,
1415          .ident = "IBM Thinkpad",
1416          .matches = {
1417                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1418                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1419                      },
1420          },
1421 
1422         /*
1423          * Boxes that need ACPI PCI IRQ routing disabled
1424          */
1425         {
1426          .callback = disable_acpi_irq,
1427          .ident = "ASUS A7V",
1428          .matches = {
1429                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1430                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1431                      /* newer BIOS, Revision 1011, does work */
1432                      DMI_MATCH(DMI_BIOS_VERSION,
1433                                "ASUS A7V ACPI BIOS Revision 1007"),
1434                      },
1435          },
1436         {
1437                 /*
1438                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1439                  * for LPC bridge, which is needed for the PCI
1440                  * interrupt links to work. DSDT fix is in bug 5966.
1441                  * 2645, 2646 model numbers are shared with 600/600E/600X
1442                  */
1443          .callback = disable_acpi_irq,
1444          .ident = "IBM Thinkpad 600 Series 2645",
1445          .matches = {
1446                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1447                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1448                      },
1449          },
1450         {
1451          .callback = disable_acpi_irq,
1452          .ident = "IBM Thinkpad 600 Series 2646",
1453          .matches = {
1454                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1455                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1456                      },
1457          },
1458         /*
1459          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1460          */
1461         {                       /* _BBN 0 bug */
1462          .callback = disable_acpi_pci,
1463          .ident = "ASUS PR-DLS",
1464          .matches = {
1465                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1466                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1467                      DMI_MATCH(DMI_BIOS_VERSION,
1468                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1469                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1470                      },
1471          },
1472         {
1473          .callback = disable_acpi_pci,
1474          .ident = "Acer TravelMate 36x Laptop",
1475          .matches = {
1476                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1477                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1478                      },
1479          },
1480         {}
1481 };
1482 
1483 /* second table for DMI checks that should run after early-quirks */
1484 static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
1485         /*
1486          * HP laptops which use a DSDT reporting as HP/SB400/10000,
1487          * which includes some code which overrides all temperature
1488          * trip points to 16C if the INTIN2 input of the I/O APIC
1489          * is enabled.  This input is incorrectly designated the
1490          * ISA IRQ 0 via an interrupt source override even though
1491          * it is wired to the output of the master 8259A and INTIN0
1492          * is not connected at all.  Force ignoring BIOS IRQ0
1493          * override in that cases.
1494          */
1495         {
1496          .callback = dmi_ignore_irq0_timer_override,
1497          .ident = "HP nx6115 laptop",
1498          .matches = {
1499                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1500                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1501                      },
1502          },
1503         {
1504          .callback = dmi_ignore_irq0_timer_override,
1505          .ident = "HP NX6125 laptop",
1506          .matches = {
1507                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1508                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1509                      },
1510          },
1511         {
1512          .callback = dmi_ignore_irq0_timer_override,
1513          .ident = "HP NX6325 laptop",
1514          .matches = {
1515                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1516                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1517                      },
1518          },
1519         {
1520          .callback = dmi_ignore_irq0_timer_override,
1521          .ident = "HP 6715b laptop",
1522          .matches = {
1523                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1524                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1525                      },
1526          },
1527         {
1528          .callback = dmi_ignore_irq0_timer_override,
1529          .ident = "FUJITSU SIEMENS",
1530          .matches = {
1531                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1532                      DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1533                      },
1534          },
1535         {}
1536 };
1537 
1538 /*
1539  * acpi_boot_table_init() and acpi_boot_init()
1540  *  called from setup_arch(), always.
1541  *      1. checksums all tables
1542  *      2. enumerates lapics
1543  *      3. enumerates io-apics
1544  *
1545  * acpi_table_init() is separate to allow reading SRAT without
1546  * other side effects.
1547  *
1548  * side effects of acpi_boot_init:
1549  *      acpi_lapic = 1 if LAPIC found
1550  *      acpi_ioapic = 1 if IOAPIC found
1551  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1552  *      if acpi_blacklisted() acpi_disabled = 1;
1553  *      acpi_irq_model=...
1554  *      ...
1555  */
1556 
1557 void __init acpi_boot_table_init(void)
1558 {
1559         dmi_check_system(acpi_dmi_table);
1560 
1561         /*
1562          * If acpi_disabled, bail out
1563          */
1564         if (acpi_disabled)
1565                 return;
1566 
1567         /*
1568          * Initialize the ACPI boot-time table parser.
1569          */
1570         if (acpi_table_init()) {
1571                 disable_acpi();
1572                 return;
1573         }
1574 
1575         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1576 
1577         /*
1578          * blacklist may disable ACPI entirely
1579          */
1580         if (acpi_blacklisted()) {
1581                 if (acpi_force) {
1582                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1583                 } else {
1584                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1585                         disable_acpi();
1586                         return;
1587                 }
1588         }
1589 }
1590 
1591 int __init early_acpi_boot_init(void)
1592 {
1593         /*
1594          * If acpi_disabled, bail out
1595          */
1596         if (acpi_disabled)
1597                 return 1;
1598 
1599         /*
1600          * Process the Multiple APIC Description Table (MADT), if present
1601          */
1602         early_acpi_process_madt();
1603 
1604         /*
1605          * Hardware-reduced ACPI mode initialization:
1606          */
1607         acpi_reduced_hw_init();
1608 
1609         return 0;
1610 }
1611 
1612 int __init acpi_boot_init(void)
1613 {
1614         /* those are executed after early-quirks are executed */
1615         dmi_check_system(acpi_dmi_table_late);
1616 
1617         /*
1618          * If acpi_disabled, bail out
1619          */
1620         if (acpi_disabled)
1621                 return 1;
1622 
1623         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1624 
1625         /*
1626          * set sci_int and PM timer address
1627          */
1628         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1629 
1630         /*
1631          * Process the Multiple APIC Description Table (MADT), if present
1632          */
1633         acpi_process_madt();
1634 
1635         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1636         if (IS_ENABLED(CONFIG_ACPI_BGRT))
1637                 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1638 
1639         if (!acpi_noirq)
1640                 x86_init.pci.init = pci_acpi_init;
1641 
1642         /* Do not enable ACPI SPCR console by default */
1643         acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
1644         return 0;
1645 }
1646 
1647 static int __init parse_acpi(char *arg)
1648 {
1649         if (!arg)
1650                 return -EINVAL;
1651 
1652         /* "acpi=off" disables both ACPI table parsing and interpreter */
1653         if (strcmp(arg, "off") == 0) {
1654                 disable_acpi();
1655         }
1656         /* acpi=force to over-ride black-list */
1657         else if (strcmp(arg, "force") == 0) {
1658                 acpi_force = 1;
1659                 acpi_disabled = 0;
1660         }
1661         /* acpi=strict disables out-of-spec workarounds */
1662         else if (strcmp(arg, "strict") == 0) {
1663                 acpi_strict = 1;
1664         }
1665         /* acpi=rsdt use RSDT instead of XSDT */
1666         else if (strcmp(arg, "rsdt") == 0) {
1667                 acpi_gbl_do_not_use_xsdt = TRUE;
1668         }
1669         /* "acpi=noirq" disables ACPI interrupt routing */
1670         else if (strcmp(arg, "noirq") == 0) {
1671                 acpi_noirq_set();
1672         }
1673         /* "acpi=copy_dsdt" copys DSDT */
1674         else if (strcmp(arg, "copy_dsdt") == 0) {
1675                 acpi_gbl_copy_dsdt_locally = 1;
1676         }
1677         /* "acpi=nocmcff" disables FF mode for corrected errors */
1678         else if (strcmp(arg, "nocmcff") == 0) {
1679                 acpi_disable_cmcff = 1;
1680         } else {
1681                 /* Core will printk when we return error. */
1682                 return -EINVAL;
1683         }
1684         return 0;
1685 }
1686 early_param("acpi", parse_acpi);
1687 
1688 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1689 static int __init parse_pci(char *arg)
1690 {
1691         if (arg && strcmp(arg, "noacpi") == 0)
1692                 acpi_disable_pci();
1693         return 0;
1694 }
1695 early_param("pci", parse_pci);
1696 
1697 int __init acpi_mps_check(void)
1698 {
1699 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1700 /* mptable code is not built-in*/
1701         if (acpi_disabled || acpi_noirq) {
1702                 printk(KERN_WARNING "MPS support code is not built-in.\n"
1703                        "Using acpi=off or acpi=noirq or pci=noacpi "
1704                        "may have problem\n");
1705                 return 1;
1706         }
1707 #endif
1708         return 0;
1709 }
1710 
1711 #ifdef CONFIG_X86_IO_APIC
1712 static int __init parse_acpi_skip_timer_override(char *arg)
1713 {
1714         acpi_skip_timer_override = 1;
1715         return 0;
1716 }
1717 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1718 
1719 static int __init parse_acpi_use_timer_override(char *arg)
1720 {
1721         acpi_use_timer_override = 1;
1722         return 0;
1723 }
1724 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1725 #endif /* CONFIG_X86_IO_APIC */
1726 
1727 static int __init setup_acpi_sci(char *s)
1728 {
1729         if (!s)
1730                 return -EINVAL;
1731         if (!strcmp(s, "edge"))
1732                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1733                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1734         else if (!strcmp(s, "level"))
1735                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1736                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1737         else if (!strcmp(s, "high"))
1738                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1739                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1740         else if (!strcmp(s, "low"))
1741                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1742                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1743         else
1744                 return -EINVAL;
1745         return 0;
1746 }
1747 early_param("acpi_sci", setup_acpi_sci);
1748 
1749 int __acpi_acquire_global_lock(unsigned int *lock)
1750 {
1751         unsigned int old, new, val;
1752         do {
1753                 old = *lock;
1754                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1755                 val = cmpxchg(lock, old, new);
1756         } while (unlikely (val != old));
1757         return (new < 3) ? -1 : 0;
1758 }
1759 
1760 int __acpi_release_global_lock(unsigned int *lock)
1761 {
1762         unsigned int old, new, val;
1763         do {
1764                 old = *lock;
1765                 new = old & ~0x3;
1766                 val = cmpxchg(lock, old, new);
1767         } while (unlikely (val != old));
1768         return old & 0x1;
1769 }
1770 
1771 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1772 {
1773         e820__range_add(addr, size, E820_TYPE_ACPI);
1774         e820__update_table_print();
1775 }
1776 
1777 u64 x86_default_get_root_pointer(void)
1778 {
1779         return boot_params.acpi_rsdp_addr;
1780 }
1781 

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