xref: /linux/arch/x86/kernel/acpi/boot.c (revision db6d8d5fdf9537641c76ba7f32e02b4bcc600972)
1 /*
2  *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
3  *
4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or
12  *  (at your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful,
15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *  GNU General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License
20  *  along with this program; if not, write to the Free Software
21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  */
25 
26 #include <linux/init.h>
27 #include <linux/acpi.h>
28 #include <linux/acpi_pmtmr.h>
29 #include <linux/efi.h>
30 #include <linux/cpumask.h>
31 #include <linux/export.h>
32 #include <linux/dmi.h>
33 #include <linux/irq.h>
34 #include <linux/slab.h>
35 #include <linux/bootmem.h>
36 #include <linux/ioport.h>
37 #include <linux/pci.h>
38 
39 #include <asm/irqdomain.h>
40 #include <asm/pci_x86.h>
41 #include <asm/pgtable.h>
42 #include <asm/io_apic.h>
43 #include <asm/apic.h>
44 #include <asm/io.h>
45 #include <asm/mpspec.h>
46 #include <asm/smp.h>
47 #include <asm/i8259.h>
48 
49 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
50 static int __initdata acpi_force = 0;
51 int acpi_disabled;
52 EXPORT_SYMBOL(acpi_disabled);
53 
54 #ifdef	CONFIG_X86_64
55 # include <asm/proto.h>
56 #endif				/* X86 */
57 
58 #define PREFIX			"ACPI: "
59 
60 int acpi_noirq;				/* skip ACPI IRQ initialization */
61 int acpi_pci_disabled;		/* skip ACPI PCI scan and IRQ initialization */
62 EXPORT_SYMBOL(acpi_pci_disabled);
63 
64 int acpi_lapic;
65 int acpi_ioapic;
66 int acpi_strict;
67 int acpi_disable_cmcff;
68 
69 u8 acpi_sci_flags __initdata;
70 int acpi_sci_override_gsi __initdata;
71 int acpi_skip_timer_override __initdata;
72 int acpi_use_timer_override __initdata;
73 int acpi_fix_pin2_polarity __initdata;
74 
75 #ifdef CONFIG_X86_LOCAL_APIC
76 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
77 #endif
78 
79 /*
80  * Locks related to IOAPIC hotplug
81  * Hotplug side:
82  *	->device_hotplug_lock
83  *		->acpi_ioapic_lock
84  *			->ioapic_lock
85  * Interrupt mapping side:
86  *	->acpi_ioapic_lock
87  *		->ioapic_mutex
88  *			->ioapic_lock
89  */
90 static DEFINE_MUTEX(acpi_ioapic_lock);
91 
92 /* --------------------------------------------------------------------------
93                               Boot-time Configuration
94    -------------------------------------------------------------------------- */
95 
96 /*
97  * The default interrupt routing model is PIC (8259).  This gets
98  * overridden if IOAPICs are enumerated (below).
99  */
100 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
101 
102 
103 /*
104  * ISA irqs by default are the first 16 gsis but can be
105  * any gsi as specified by an interrupt source override.
106  */
107 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
108 	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
109 };
110 
111 #define	ACPI_INVALID_GSI		INT_MIN
112 
113 /*
114  * This is just a simple wrapper around early_ioremap(),
115  * with sanity checks for phys == 0 and size == 0.
116  */
117 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
118 {
119 
120 	if (!phys || !size)
121 		return NULL;
122 
123 	return early_ioremap(phys, size);
124 }
125 
126 void __init __acpi_unmap_table(char *map, unsigned long size)
127 {
128 	if (!map || !size)
129 		return;
130 
131 	early_iounmap(map, size);
132 }
133 
134 #ifdef CONFIG_X86_LOCAL_APIC
135 static int __init acpi_parse_madt(struct acpi_table_header *table)
136 {
137 	struct acpi_table_madt *madt = NULL;
138 
139 	if (!boot_cpu_has(X86_FEATURE_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  * @acpiid: ACPI id to register
165  * @enabled: this cpu is enabled or not
166  *
167  * Returns the logic cpu number which maps to the local apic
168  */
169 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
170 {
171 	unsigned int ver = 0;
172 	int cpu;
173 
174 	if (id >= MAX_LOCAL_APIC) {
175 		printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
176 		return -EINVAL;
177 	}
178 
179 	if (boot_cpu_physical_apicid != -1U)
180 		ver = boot_cpu_apic_version;
181 
182 	cpu = __generic_processor_info(id, ver, enabled);
183 	if (cpu >= 0)
184 		early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
185 
186 	return cpu;
187 }
188 
189 static int __init
190 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
191 {
192 	struct acpi_madt_local_x2apic *processor = NULL;
193 	int apic_id;
194 	u8 enabled;
195 
196 	processor = (struct acpi_madt_local_x2apic *)header;
197 
198 	if (BAD_MADT_ENTRY(processor, end))
199 		return -EINVAL;
200 
201 	acpi_table_print_madt_entry(header);
202 
203 	apic_id = processor->local_apic_id;
204 	enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
205 #ifdef CONFIG_X86_X2APIC
206 	/*
207 	 * We need to register disabled CPU as well to permit
208 	 * counting disabled CPUs. This allows us to size
209 	 * cpus_possible_map more accurately, to permit
210 	 * to not preallocating memory for all NR_CPUS
211 	 * when we use CPU hotplug.
212 	 */
213 	if (!apic->apic_id_valid(apic_id) && enabled)
214 		printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
215 	else
216 		acpi_register_lapic(apic_id, processor->uid, enabled);
217 #else
218 	printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
219 #endif
220 
221 	return 0;
222 }
223 
224 static int __init
225 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
226 {
227 	struct acpi_madt_local_apic *processor = NULL;
228 
229 	processor = (struct acpi_madt_local_apic *)header;
230 
231 	if (BAD_MADT_ENTRY(processor, end))
232 		return -EINVAL;
233 
234 	acpi_table_print_madt_entry(header);
235 
236 	/* Ignore invalid ID */
237 	if (processor->id == 0xff)
238 		return 0;
239 
240 	/*
241 	 * We need to register disabled CPU as well to permit
242 	 * counting disabled CPUs. This allows us to size
243 	 * cpus_possible_map more accurately, to permit
244 	 * to not preallocating memory for all NR_CPUS
245 	 * when we use CPU hotplug.
246 	 */
247 	acpi_register_lapic(processor->id,	/* APIC ID */
248 			    processor->processor_id, /* ACPI ID */
249 			    processor->lapic_flags & ACPI_MADT_ENABLED);
250 
251 	return 0;
252 }
253 
254 static int __init
255 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
256 {
257 	struct acpi_madt_local_sapic *processor = NULL;
258 
259 	processor = (struct acpi_madt_local_sapic *)header;
260 
261 	if (BAD_MADT_ENTRY(processor, end))
262 		return -EINVAL;
263 
264 	acpi_table_print_madt_entry(header);
265 
266 	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
267 			    processor->processor_id, /* ACPI ID */
268 			    processor->lapic_flags & ACPI_MADT_ENABLED);
269 
270 	return 0;
271 }
272 
273 static int __init
274 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
275 			  const unsigned long end)
276 {
277 	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
278 
279 	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
280 
281 	if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
282 		return -EINVAL;
283 
284 	acpi_table_print_madt_entry(header);
285 
286 	acpi_lapic_addr = lapic_addr_ovr->address;
287 
288 	return 0;
289 }
290 
291 static int __init
292 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
293 		      const unsigned long end)
294 {
295 	struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
296 
297 	x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
298 
299 	if (BAD_MADT_ENTRY(x2apic_nmi, end))
300 		return -EINVAL;
301 
302 	acpi_table_print_madt_entry(header);
303 
304 	if (x2apic_nmi->lint != 1)
305 		printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
306 
307 	return 0;
308 }
309 
310 static int __init
311 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
312 {
313 	struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
314 
315 	lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
316 
317 	if (BAD_MADT_ENTRY(lapic_nmi, end))
318 		return -EINVAL;
319 
320 	acpi_table_print_madt_entry(header);
321 
322 	if (lapic_nmi->lint != 1)
323 		printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
324 
325 	return 0;
326 }
327 
328 #endif				/*CONFIG_X86_LOCAL_APIC */
329 
330 #ifdef CONFIG_X86_IO_APIC
331 #define MP_ISA_BUS		0
332 
333 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
334 					  u32 gsi)
335 {
336 	int ioapic;
337 	int pin;
338 	struct mpc_intsrc mp_irq;
339 
340 	/*
341 	 * Convert 'gsi' to 'ioapic.pin'.
342 	 */
343 	ioapic = mp_find_ioapic(gsi);
344 	if (ioapic < 0)
345 		return;
346 	pin = mp_find_ioapic_pin(ioapic, gsi);
347 
348 	/*
349 	 * TBD: This check is for faulty timer entries, where the override
350 	 *      erroneously sets the trigger to level, resulting in a HUGE
351 	 *      increase of timer interrupts!
352 	 */
353 	if ((bus_irq == 0) && (trigger == 3))
354 		trigger = 1;
355 
356 	mp_irq.type = MP_INTSRC;
357 	mp_irq.irqtype = mp_INT;
358 	mp_irq.irqflag = (trigger << 2) | polarity;
359 	mp_irq.srcbus = MP_ISA_BUS;
360 	mp_irq.srcbusirq = bus_irq;	/* IRQ */
361 	mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
362 	mp_irq.dstirq = pin;	/* INTIN# */
363 
364 	mp_save_irq(&mp_irq);
365 
366 	/*
367 	 * Reset default identity mapping if gsi is also an legacy IRQ,
368 	 * otherwise there will be more than one entry with the same GSI
369 	 * and acpi_isa_irq_to_gsi() may give wrong result.
370 	 */
371 	if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
372 		isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
373 	isa_irq_to_gsi[bus_irq] = gsi;
374 }
375 
376 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
377 			int polarity)
378 {
379 #ifdef CONFIG_X86_MPPARSE
380 	struct mpc_intsrc mp_irq;
381 	struct pci_dev *pdev;
382 	unsigned char number;
383 	unsigned int devfn;
384 	int ioapic;
385 	u8 pin;
386 
387 	if (!acpi_ioapic)
388 		return 0;
389 	if (!dev || !dev_is_pci(dev))
390 		return 0;
391 
392 	pdev = to_pci_dev(dev);
393 	number = pdev->bus->number;
394 	devfn = pdev->devfn;
395 	pin = pdev->pin;
396 	/* print the entry should happen on mptable identically */
397 	mp_irq.type = MP_INTSRC;
398 	mp_irq.irqtype = mp_INT;
399 	mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
400 				(polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
401 	mp_irq.srcbus = number;
402 	mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
403 	ioapic = mp_find_ioapic(gsi);
404 	mp_irq.dstapic = mpc_ioapic_id(ioapic);
405 	mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
406 
407 	mp_save_irq(&mp_irq);
408 #endif
409 	return 0;
410 }
411 
412 static int __init
413 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
414 {
415 	struct acpi_madt_io_apic *ioapic = NULL;
416 	struct ioapic_domain_cfg cfg = {
417 		.type = IOAPIC_DOMAIN_DYNAMIC,
418 		.ops = &mp_ioapic_irqdomain_ops,
419 	};
420 
421 	ioapic = (struct acpi_madt_io_apic *)header;
422 
423 	if (BAD_MADT_ENTRY(ioapic, end))
424 		return -EINVAL;
425 
426 	acpi_table_print_madt_entry(header);
427 
428 	/* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
429 	if (ioapic->global_irq_base < nr_legacy_irqs())
430 		cfg.type = IOAPIC_DOMAIN_LEGACY;
431 
432 	mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
433 			   &cfg);
434 
435 	return 0;
436 }
437 
438 /*
439  * Parse Interrupt Source Override for the ACPI SCI
440  */
441 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
442 {
443 	if (trigger == 0)	/* compatible SCI trigger is level */
444 		trigger = 3;
445 
446 	if (polarity == 0)	/* compatible SCI polarity is low */
447 		polarity = 3;
448 
449 	/* Command-line over-ride via acpi_sci= */
450 	if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
451 		trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
452 
453 	if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
454 		polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
455 
456 	mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
457 
458 	/*
459 	 * stash over-ride to indicate we've been here
460 	 * and for later update of acpi_gbl_FADT
461 	 */
462 	acpi_sci_override_gsi = gsi;
463 	return;
464 }
465 
466 static int __init
467 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
468 		       const unsigned long end)
469 {
470 	struct acpi_madt_interrupt_override *intsrc = NULL;
471 
472 	intsrc = (struct acpi_madt_interrupt_override *)header;
473 
474 	if (BAD_MADT_ENTRY(intsrc, end))
475 		return -EINVAL;
476 
477 	acpi_table_print_madt_entry(header);
478 
479 	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
480 		acpi_sci_ioapic_setup(intsrc->source_irq,
481 				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
482 				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
483 				      intsrc->global_irq);
484 		return 0;
485 	}
486 
487 	if (intsrc->source_irq == 0) {
488 		if (acpi_skip_timer_override) {
489 			printk(PREFIX "BIOS IRQ0 override ignored.\n");
490 			return 0;
491 		}
492 
493 		if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
494 			&& (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
495 			intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
496 			printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
497 		}
498 	}
499 
500 	mp_override_legacy_irq(intsrc->source_irq,
501 				intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
502 				(intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
503 				intsrc->global_irq);
504 
505 	return 0;
506 }
507 
508 static int __init
509 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
510 {
511 	struct acpi_madt_nmi_source *nmi_src = NULL;
512 
513 	nmi_src = (struct acpi_madt_nmi_source *)header;
514 
515 	if (BAD_MADT_ENTRY(nmi_src, end))
516 		return -EINVAL;
517 
518 	acpi_table_print_madt_entry(header);
519 
520 	/* TBD: Support nimsrc entries? */
521 
522 	return 0;
523 }
524 
525 #endif				/* CONFIG_X86_IO_APIC */
526 
527 /*
528  * acpi_pic_sci_set_trigger()
529  *
530  * use ELCR to set PIC-mode trigger type for SCI
531  *
532  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
533  * it may require Edge Trigger -- use "acpi_sci=edge"
534  *
535  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
536  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
537  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
538  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
539  */
540 
541 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
542 {
543 	unsigned int mask = 1 << irq;
544 	unsigned int old, new;
545 
546 	/* Real old ELCR mask */
547 	old = inb(0x4d0) | (inb(0x4d1) << 8);
548 
549 	/*
550 	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
551 	 * since we will set it correctly as we enable the PCI irq
552 	 * routing.
553 	 */
554 	new = acpi_noirq ? old : 0;
555 
556 	/*
557 	 * Update SCI information in the ELCR, it isn't in the PCI
558 	 * routing tables..
559 	 */
560 	switch (trigger) {
561 	case 1:		/* Edge - clear */
562 		new &= ~mask;
563 		break;
564 	case 3:		/* Level - set */
565 		new |= mask;
566 		break;
567 	}
568 
569 	if (old == new)
570 		return;
571 
572 	printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
573 	outb(new, 0x4d0);
574 	outb(new >> 8, 0x4d1);
575 }
576 
577 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
578 {
579 	int rc, irq, trigger, polarity;
580 
581 	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
582 		*irqp = gsi;
583 		return 0;
584 	}
585 
586 	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
587 	if (rc == 0) {
588 		trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
589 		polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
590 		irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
591 		if (irq >= 0) {
592 			*irqp = irq;
593 			return 0;
594 		}
595 	}
596 
597 	return -1;
598 }
599 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
600 
601 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
602 {
603 	if (isa_irq < nr_legacy_irqs() &&
604 	    isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
605 		*gsi = isa_irq_to_gsi[isa_irq];
606 		return 0;
607 	}
608 
609 	return -1;
610 }
611 
612 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
613 				 int trigger, int polarity)
614 {
615 #ifdef CONFIG_PCI
616 	/*
617 	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
618 	 */
619 	if (trigger == ACPI_LEVEL_SENSITIVE)
620 		elcr_set_level_irq(gsi);
621 #endif
622 
623 	return gsi;
624 }
625 
626 #ifdef CONFIG_X86_LOCAL_APIC
627 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
628 				    int trigger, int polarity)
629 {
630 	int irq = gsi;
631 #ifdef CONFIG_X86_IO_APIC
632 	int node;
633 	struct irq_alloc_info info;
634 
635 	node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
636 	trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
637 	polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
638 	ioapic_set_alloc_attr(&info, node, trigger, polarity);
639 
640 	mutex_lock(&acpi_ioapic_lock);
641 	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
642 	/* Don't set up the ACPI SCI because it's already set up */
643 	if (irq >= 0 && enable_update_mptable &&
644 	    acpi_gbl_FADT.sci_interrupt != gsi)
645 		mp_config_acpi_gsi(dev, gsi, trigger, polarity);
646 	mutex_unlock(&acpi_ioapic_lock);
647 #endif
648 
649 	return irq;
650 }
651 
652 static void acpi_unregister_gsi_ioapic(u32 gsi)
653 {
654 #ifdef CONFIG_X86_IO_APIC
655 	int irq;
656 
657 	mutex_lock(&acpi_ioapic_lock);
658 	irq = mp_map_gsi_to_irq(gsi, 0, NULL);
659 	if (irq > 0)
660 		mp_unmap_irq(irq);
661 	mutex_unlock(&acpi_ioapic_lock);
662 #endif
663 }
664 #endif
665 
666 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
667 			   int trigger, int polarity) = acpi_register_gsi_pic;
668 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
669 
670 #ifdef CONFIG_ACPI_SLEEP
671 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
672 #else
673 int (*acpi_suspend_lowlevel)(void);
674 #endif
675 
676 /*
677  * success: return IRQ number (>=0)
678  * failure: return < 0
679  */
680 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
681 {
682 	return __acpi_register_gsi(dev, gsi, trigger, polarity);
683 }
684 EXPORT_SYMBOL_GPL(acpi_register_gsi);
685 
686 void acpi_unregister_gsi(u32 gsi)
687 {
688 	if (__acpi_unregister_gsi)
689 		__acpi_unregister_gsi(gsi);
690 }
691 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
692 
693 #ifdef CONFIG_X86_LOCAL_APIC
694 static void __init acpi_set_irq_model_ioapic(void)
695 {
696 	acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
697 	__acpi_register_gsi = acpi_register_gsi_ioapic;
698 	__acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
699 	acpi_ioapic = 1;
700 }
701 #endif
702 
703 /*
704  *  ACPI based hotplug support for CPU
705  */
706 #ifdef CONFIG_ACPI_HOTPLUG_CPU
707 #include <acpi/processor.h>
708 
709 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
710 {
711 #ifdef CONFIG_ACPI_NUMA
712 	int nid;
713 
714 	nid = acpi_get_node(handle);
715 	if (nid != -1) {
716 		set_apicid_to_node(physid, nid);
717 		numa_set_node(cpu, nid);
718 	}
719 #endif
720 	return 0;
721 }
722 
723 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
724 {
725 	int cpu;
726 
727 	cpu = acpi_register_lapic(physid, U32_MAX, ACPI_MADT_ENABLED);
728 	if (cpu < 0) {
729 		pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
730 		return cpu;
731 	}
732 
733 	acpi_processor_set_pdc(handle);
734 	acpi_map_cpu2node(handle, cpu, physid);
735 
736 	*pcpu = cpu;
737 	return 0;
738 }
739 EXPORT_SYMBOL(acpi_map_cpu);
740 
741 int acpi_unmap_cpu(int cpu)
742 {
743 #ifdef CONFIG_ACPI_NUMA
744 	set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
745 #endif
746 
747 	per_cpu(x86_cpu_to_apicid, cpu) = -1;
748 	set_cpu_present(cpu, false);
749 	num_processors--;
750 
751 	return (0);
752 }
753 EXPORT_SYMBOL(acpi_unmap_cpu);
754 #endif				/* CONFIG_ACPI_HOTPLUG_CPU */
755 
756 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
757 {
758 	int ret = -ENOSYS;
759 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
760 	int ioapic_id;
761 	u64 addr;
762 	struct ioapic_domain_cfg cfg = {
763 		.type = IOAPIC_DOMAIN_DYNAMIC,
764 		.ops = &mp_ioapic_irqdomain_ops,
765 	};
766 
767 	ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
768 	if (ioapic_id < 0) {
769 		unsigned long long uid;
770 		acpi_status status;
771 
772 		status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
773 					       NULL, &uid);
774 		if (ACPI_FAILURE(status)) {
775 			acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
776 			return -EINVAL;
777 		}
778 		ioapic_id = (int)uid;
779 	}
780 
781 	mutex_lock(&acpi_ioapic_lock);
782 	ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
783 	mutex_unlock(&acpi_ioapic_lock);
784 #endif
785 
786 	return ret;
787 }
788 EXPORT_SYMBOL(acpi_register_ioapic);
789 
790 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
791 {
792 	int ret = -ENOSYS;
793 
794 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
795 	mutex_lock(&acpi_ioapic_lock);
796 	ret  = mp_unregister_ioapic(gsi_base);
797 	mutex_unlock(&acpi_ioapic_lock);
798 #endif
799 
800 	return ret;
801 }
802 EXPORT_SYMBOL(acpi_unregister_ioapic);
803 
804 /**
805  * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
806  *			    has been registered
807  * @handle:	ACPI handle of the IOAPIC deivce
808  * @gsi_base:	GSI base associated with the IOAPIC
809  *
810  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
811  * with acpi_register_ioapic()/acpi_unregister_ioapic().
812  */
813 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
814 {
815 	int ret = 0;
816 
817 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
818 	mutex_lock(&acpi_ioapic_lock);
819 	ret  = mp_ioapic_registered(gsi_base);
820 	mutex_unlock(&acpi_ioapic_lock);
821 #endif
822 
823 	return ret;
824 }
825 
826 static int __init acpi_parse_sbf(struct acpi_table_header *table)
827 {
828 	struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
829 
830 	sbf_port = sb->cmos_index;	/* Save CMOS port */
831 
832 	return 0;
833 }
834 
835 #ifdef CONFIG_HPET_TIMER
836 #include <asm/hpet.h>
837 
838 static struct resource *hpet_res __initdata;
839 
840 static int __init acpi_parse_hpet(struct acpi_table_header *table)
841 {
842 	struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
843 
844 	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
845 		printk(KERN_WARNING PREFIX "HPET timers must be located in "
846 		       "memory.\n");
847 		return -1;
848 	}
849 
850 	hpet_address = hpet_tbl->address.address;
851 	hpet_blockid = hpet_tbl->sequence;
852 
853 	/*
854 	 * Some broken BIOSes advertise HPET at 0x0. We really do not
855 	 * want to allocate a resource there.
856 	 */
857 	if (!hpet_address) {
858 		printk(KERN_WARNING PREFIX
859 		       "HPET id: %#x base: %#lx is invalid\n",
860 		       hpet_tbl->id, hpet_address);
861 		return 0;
862 	}
863 #ifdef CONFIG_X86_64
864 	/*
865 	 * Some even more broken BIOSes advertise HPET at
866 	 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
867 	 * some noise:
868 	 */
869 	if (hpet_address == 0xfed0000000000000UL) {
870 		if (!hpet_force_user) {
871 			printk(KERN_WARNING PREFIX "HPET id: %#x "
872 			       "base: 0xfed0000000000000 is bogus\n "
873 			       "try hpet=force on the kernel command line to "
874 			       "fix it up to 0xfed00000.\n", hpet_tbl->id);
875 			hpet_address = 0;
876 			return 0;
877 		}
878 		printk(KERN_WARNING PREFIX
879 		       "HPET id: %#x base: 0xfed0000000000000 fixed up "
880 		       "to 0xfed00000.\n", hpet_tbl->id);
881 		hpet_address >>= 32;
882 	}
883 #endif
884 	printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
885 	       hpet_tbl->id, hpet_address);
886 
887 	/*
888 	 * Allocate and initialize the HPET firmware resource for adding into
889 	 * the resource tree during the lateinit timeframe.
890 	 */
891 #define HPET_RESOURCE_NAME_SIZE 9
892 	hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
893 
894 	hpet_res->name = (void *)&hpet_res[1];
895 	hpet_res->flags = IORESOURCE_MEM;
896 	snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
897 		 hpet_tbl->sequence);
898 
899 	hpet_res->start = hpet_address;
900 	hpet_res->end = hpet_address + (1 * 1024) - 1;
901 
902 	return 0;
903 }
904 
905 /*
906  * hpet_insert_resource inserts the HPET resources used into the resource
907  * tree.
908  */
909 static __init int hpet_insert_resource(void)
910 {
911 	if (!hpet_res)
912 		return 1;
913 
914 	return insert_resource(&iomem_resource, hpet_res);
915 }
916 
917 late_initcall(hpet_insert_resource);
918 
919 #else
920 #define	acpi_parse_hpet	NULL
921 #endif
922 
923 static int __init acpi_parse_fadt(struct acpi_table_header *table)
924 {
925 	if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
926 		pr_debug("ACPI: no legacy devices present\n");
927 		x86_platform.legacy.devices.pnpbios = 0;
928 	}
929 
930 	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
931 		pr_debug("ACPI: not registering RTC platform device\n");
932 		x86_platform.legacy.rtc = 0;
933 	}
934 
935 #ifdef CONFIG_X86_PM_TIMER
936 	/* detect the location of the ACPI PM Timer */
937 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
938 		/* FADT rev. 2 */
939 		if (acpi_gbl_FADT.xpm_timer_block.space_id !=
940 		    ACPI_ADR_SPACE_SYSTEM_IO)
941 			return 0;
942 
943 		pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
944 		/*
945 		 * "X" fields are optional extensions to the original V1.0
946 		 * fields, so we must selectively expand V1.0 fields if the
947 		 * corresponding X field is zero.
948 	 	 */
949 		if (!pmtmr_ioport)
950 			pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
951 	} else {
952 		/* FADT rev. 1 */
953 		pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
954 	}
955 	if (pmtmr_ioport)
956 		printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
957 		       pmtmr_ioport);
958 #endif
959 	return 0;
960 }
961 
962 #ifdef	CONFIG_X86_LOCAL_APIC
963 /*
964  * Parse LAPIC entries in MADT
965  * returns 0 on success, < 0 on error
966  */
967 
968 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
969 {
970 	int count;
971 
972 	if (!boot_cpu_has(X86_FEATURE_APIC))
973 		return -ENODEV;
974 
975 	/*
976 	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
977 	 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
978 	 */
979 
980 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
981 				      acpi_parse_lapic_addr_ovr, 0);
982 	if (count < 0) {
983 		printk(KERN_ERR PREFIX
984 		       "Error parsing LAPIC address override entry\n");
985 		return count;
986 	}
987 
988 	register_lapic_address(acpi_lapic_addr);
989 
990 	return count;
991 }
992 
993 static int __init acpi_parse_madt_lapic_entries(void)
994 {
995 	int count;
996 	int x2count = 0;
997 	int ret;
998 	struct acpi_subtable_proc madt_proc[2];
999 
1000 	if (!boot_cpu_has(X86_FEATURE_APIC))
1001 		return -ENODEV;
1002 
1003 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1004 				      acpi_parse_sapic, MAX_LOCAL_APIC);
1005 
1006 	if (!count) {
1007 		memset(madt_proc, 0, sizeof(madt_proc));
1008 		madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1009 		madt_proc[0].handler = acpi_parse_lapic;
1010 		madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1011 		madt_proc[1].handler = acpi_parse_x2apic;
1012 		ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1013 				sizeof(struct acpi_table_madt),
1014 				madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1015 		if (ret < 0) {
1016 			printk(KERN_ERR PREFIX
1017 					"Error parsing LAPIC/X2APIC entries\n");
1018 			return ret;
1019 		}
1020 
1021 		count = madt_proc[0].count;
1022 		x2count = madt_proc[1].count;
1023 	}
1024 	if (!count && !x2count) {
1025 		printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1026 		/* TBD: Cleanup to allow fallback to MPS */
1027 		return -ENODEV;
1028 	} else if (count < 0 || x2count < 0) {
1029 		printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1030 		/* TBD: Cleanup to allow fallback to MPS */
1031 		return count;
1032 	}
1033 
1034 	x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1035 					acpi_parse_x2apic_nmi, 0);
1036 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1037 				      acpi_parse_lapic_nmi, 0);
1038 	if (count < 0 || x2count < 0) {
1039 		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1040 		/* TBD: Cleanup to allow fallback to MPS */
1041 		return count;
1042 	}
1043 	return 0;
1044 }
1045 #endif				/* CONFIG_X86_LOCAL_APIC */
1046 
1047 #ifdef	CONFIG_X86_IO_APIC
1048 static void __init mp_config_acpi_legacy_irqs(void)
1049 {
1050 	int i;
1051 	struct mpc_intsrc mp_irq;
1052 
1053 #ifdef CONFIG_EISA
1054 	/*
1055 	 * Fabricate the legacy ISA bus (bus #31).
1056 	 */
1057 	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1058 #endif
1059 	set_bit(MP_ISA_BUS, mp_bus_not_pci);
1060 	pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1061 
1062 	/*
1063 	 * Use the default configuration for the IRQs 0-15.  Unless
1064 	 * overridden by (MADT) interrupt source override entries.
1065 	 */
1066 	for (i = 0; i < nr_legacy_irqs(); i++) {
1067 		int ioapic, pin;
1068 		unsigned int dstapic;
1069 		int idx;
1070 		u32 gsi;
1071 
1072 		/* Locate the gsi that irq i maps to. */
1073 		if (acpi_isa_irq_to_gsi(i, &gsi))
1074 			continue;
1075 
1076 		/*
1077 		 * Locate the IOAPIC that manages the ISA IRQ.
1078 		 */
1079 		ioapic = mp_find_ioapic(gsi);
1080 		if (ioapic < 0)
1081 			continue;
1082 		pin = mp_find_ioapic_pin(ioapic, gsi);
1083 		dstapic = mpc_ioapic_id(ioapic);
1084 
1085 		for (idx = 0; idx < mp_irq_entries; idx++) {
1086 			struct mpc_intsrc *irq = mp_irqs + idx;
1087 
1088 			/* Do we already have a mapping for this ISA IRQ? */
1089 			if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1090 				break;
1091 
1092 			/* Do we already have a mapping for this IOAPIC pin */
1093 			if (irq->dstapic == dstapic && irq->dstirq == pin)
1094 				break;
1095 		}
1096 
1097 		if (idx != mp_irq_entries) {
1098 			printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1099 			continue;	/* IRQ already used */
1100 		}
1101 
1102 		mp_irq.type = MP_INTSRC;
1103 		mp_irq.irqflag = 0;	/* Conforming */
1104 		mp_irq.srcbus = MP_ISA_BUS;
1105 		mp_irq.dstapic = dstapic;
1106 		mp_irq.irqtype = mp_INT;
1107 		mp_irq.srcbusirq = i; /* Identity mapped */
1108 		mp_irq.dstirq = pin;
1109 
1110 		mp_save_irq(&mp_irq);
1111 	}
1112 }
1113 
1114 /*
1115  * Parse IOAPIC related entries in MADT
1116  * returns 0 on success, < 0 on error
1117  */
1118 static int __init acpi_parse_madt_ioapic_entries(void)
1119 {
1120 	int count;
1121 
1122 	/*
1123 	 * ACPI interpreter is required to complete interrupt setup,
1124 	 * so if it is off, don't enumerate the io-apics with ACPI.
1125 	 * If MPS is present, it will handle them,
1126 	 * otherwise the system will stay in PIC mode
1127 	 */
1128 	if (acpi_disabled || acpi_noirq)
1129 		return -ENODEV;
1130 
1131 	if (!boot_cpu_has(X86_FEATURE_APIC))
1132 		return -ENODEV;
1133 
1134 	/*
1135 	 * if "noapic" boot option, don't look for IO-APICs
1136 	 */
1137 	if (skip_ioapic_setup) {
1138 		printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1139 		       "due to 'noapic' option.\n");
1140 		return -ENODEV;
1141 	}
1142 
1143 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1144 				      MAX_IO_APICS);
1145 	if (!count) {
1146 		printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1147 		return -ENODEV;
1148 	} else if (count < 0) {
1149 		printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1150 		return count;
1151 	}
1152 
1153 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1154 				      acpi_parse_int_src_ovr, nr_irqs);
1155 	if (count < 0) {
1156 		printk(KERN_ERR PREFIX
1157 		       "Error parsing interrupt source overrides entry\n");
1158 		/* TBD: Cleanup to allow fallback to MPS */
1159 		return count;
1160 	}
1161 
1162 	/*
1163 	 * If BIOS did not supply an INT_SRC_OVR for the SCI
1164 	 * pretend we got one so we can set the SCI flags.
1165 	 */
1166 	if (!acpi_sci_override_gsi)
1167 		acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1168 				      acpi_gbl_FADT.sci_interrupt);
1169 
1170 	/* Fill in identity legacy mappings where no override */
1171 	mp_config_acpi_legacy_irqs();
1172 
1173 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1174 				      acpi_parse_nmi_src, nr_irqs);
1175 	if (count < 0) {
1176 		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1177 		/* TBD: Cleanup to allow fallback to MPS */
1178 		return count;
1179 	}
1180 
1181 	return 0;
1182 }
1183 #else
1184 static inline int acpi_parse_madt_ioapic_entries(void)
1185 {
1186 	return -1;
1187 }
1188 #endif	/* !CONFIG_X86_IO_APIC */
1189 
1190 static void __init early_acpi_process_madt(void)
1191 {
1192 #ifdef CONFIG_X86_LOCAL_APIC
1193 	int error;
1194 
1195 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1196 
1197 		/*
1198 		 * Parse MADT LAPIC entries
1199 		 */
1200 		error = early_acpi_parse_madt_lapic_addr_ovr();
1201 		if (!error) {
1202 			acpi_lapic = 1;
1203 			smp_found_config = 1;
1204 		}
1205 		if (error == -EINVAL) {
1206 			/*
1207 			 * Dell Precision Workstation 410, 610 come here.
1208 			 */
1209 			printk(KERN_ERR PREFIX
1210 			       "Invalid BIOS MADT, disabling ACPI\n");
1211 			disable_acpi();
1212 		}
1213 	}
1214 #endif
1215 }
1216 
1217 static void __init acpi_process_madt(void)
1218 {
1219 #ifdef CONFIG_X86_LOCAL_APIC
1220 	int error;
1221 
1222 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1223 
1224 		/*
1225 		 * Parse MADT LAPIC entries
1226 		 */
1227 		error = acpi_parse_madt_lapic_entries();
1228 		if (!error) {
1229 			acpi_lapic = 1;
1230 
1231 			/*
1232 			 * Parse MADT IO-APIC entries
1233 			 */
1234 			mutex_lock(&acpi_ioapic_lock);
1235 			error = acpi_parse_madt_ioapic_entries();
1236 			mutex_unlock(&acpi_ioapic_lock);
1237 			if (!error) {
1238 				acpi_set_irq_model_ioapic();
1239 
1240 				smp_found_config = 1;
1241 			}
1242 		}
1243 		if (error == -EINVAL) {
1244 			/*
1245 			 * Dell Precision Workstation 410, 610 come here.
1246 			 */
1247 			printk(KERN_ERR PREFIX
1248 			       "Invalid BIOS MADT, disabling ACPI\n");
1249 			disable_acpi();
1250 		}
1251 	} else {
1252 		/*
1253  		 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1254  		 * In the event an MPS table was found, forget it.
1255  		 * Boot with "acpi=off" to use MPS on such a system.
1256  		 */
1257 		if (smp_found_config) {
1258 			printk(KERN_WARNING PREFIX
1259 				"No APIC-table, disabling MPS\n");
1260 			smp_found_config = 0;
1261 		}
1262 	}
1263 
1264 	/*
1265 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1266 	 * processors, where MPS only supports physical.
1267 	 */
1268 	if (acpi_lapic && acpi_ioapic)
1269 		printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1270 		       "information\n");
1271 	else if (acpi_lapic)
1272 		printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1273 		       "configuration information\n");
1274 #endif
1275 	return;
1276 }
1277 
1278 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1279 {
1280 	if (!acpi_force) {
1281 		printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1282 		       d->ident);
1283 		acpi_noirq_set();
1284 	}
1285 	return 0;
1286 }
1287 
1288 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1289 {
1290 	if (!acpi_force) {
1291 		printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1292 		       d->ident);
1293 		acpi_disable_pci();
1294 	}
1295 	return 0;
1296 }
1297 
1298 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1299 {
1300 	if (!acpi_force) {
1301 		printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1302 		disable_acpi();
1303 	} else {
1304 		printk(KERN_NOTICE
1305 		       "Warning: DMI blacklist says broken, but acpi forced\n");
1306 	}
1307 	return 0;
1308 }
1309 
1310 /*
1311  * Force ignoring BIOS IRQ0 override
1312  */
1313 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1314 {
1315 	if (!acpi_skip_timer_override) {
1316 		pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1317 			d->ident);
1318 		acpi_skip_timer_override = 1;
1319 	}
1320 	return 0;
1321 }
1322 
1323 /*
1324  * ACPI offers an alternative platform interface model that removes
1325  * ACPI hardware requirements for platforms that do not implement
1326  * the PC Architecture.
1327  *
1328  * We initialize the Hardware-reduced ACPI model here:
1329  */
1330 static void __init acpi_reduced_hw_init(void)
1331 {
1332 	if (acpi_gbl_reduced_hardware) {
1333 		/*
1334 		 * Override x86_init functions and bypass legacy pic
1335 		 * in Hardware-reduced ACPI mode
1336 		 */
1337 		x86_init.timers.timer_init	= x86_init_noop;
1338 		x86_init.irqs.pre_vector_init	= x86_init_noop;
1339 		legacy_pic			= &null_legacy_pic;
1340 	}
1341 }
1342 
1343 /*
1344  * If your system is blacklisted here, but you find that acpi=force
1345  * works for you, please contact linux-acpi@vger.kernel.org
1346  */
1347 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1348 	/*
1349 	 * Boxes that need ACPI disabled
1350 	 */
1351 	{
1352 	 .callback = dmi_disable_acpi,
1353 	 .ident = "IBM Thinkpad",
1354 	 .matches = {
1355 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1356 		     DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1357 		     },
1358 	 },
1359 
1360 	/*
1361 	 * Boxes that need ACPI PCI IRQ routing disabled
1362 	 */
1363 	{
1364 	 .callback = disable_acpi_irq,
1365 	 .ident = "ASUS A7V",
1366 	 .matches = {
1367 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1368 		     DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1369 		     /* newer BIOS, Revision 1011, does work */
1370 		     DMI_MATCH(DMI_BIOS_VERSION,
1371 			       "ASUS A7V ACPI BIOS Revision 1007"),
1372 		     },
1373 	 },
1374 	{
1375 		/*
1376 		 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1377 		 * for LPC bridge, which is needed for the PCI
1378 		 * interrupt links to work. DSDT fix is in bug 5966.
1379 		 * 2645, 2646 model numbers are shared with 600/600E/600X
1380 		 */
1381 	 .callback = disable_acpi_irq,
1382 	 .ident = "IBM Thinkpad 600 Series 2645",
1383 	 .matches = {
1384 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1385 		     DMI_MATCH(DMI_BOARD_NAME, "2645"),
1386 		     },
1387 	 },
1388 	{
1389 	 .callback = disable_acpi_irq,
1390 	 .ident = "IBM Thinkpad 600 Series 2646",
1391 	 .matches = {
1392 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1393 		     DMI_MATCH(DMI_BOARD_NAME, "2646"),
1394 		     },
1395 	 },
1396 	/*
1397 	 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1398 	 */
1399 	{			/* _BBN 0 bug */
1400 	 .callback = disable_acpi_pci,
1401 	 .ident = "ASUS PR-DLS",
1402 	 .matches = {
1403 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1404 		     DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1405 		     DMI_MATCH(DMI_BIOS_VERSION,
1406 			       "ASUS PR-DLS ACPI BIOS Revision 1010"),
1407 		     DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1408 		     },
1409 	 },
1410 	{
1411 	 .callback = disable_acpi_pci,
1412 	 .ident = "Acer TravelMate 36x Laptop",
1413 	 .matches = {
1414 		     DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1415 		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1416 		     },
1417 	 },
1418 	{}
1419 };
1420 
1421 /* second table for DMI checks that should run after early-quirks */
1422 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1423 	/*
1424 	 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1425 	 * which includes some code which overrides all temperature
1426 	 * trip points to 16C if the INTIN2 input of the I/O APIC
1427 	 * is enabled.  This input is incorrectly designated the
1428 	 * ISA IRQ 0 via an interrupt source override even though
1429 	 * it is wired to the output of the master 8259A and INTIN0
1430 	 * is not connected at all.  Force ignoring BIOS IRQ0
1431 	 * override in that cases.
1432 	 */
1433 	{
1434 	 .callback = dmi_ignore_irq0_timer_override,
1435 	 .ident = "HP nx6115 laptop",
1436 	 .matches = {
1437 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1438 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1439 		     },
1440 	 },
1441 	{
1442 	 .callback = dmi_ignore_irq0_timer_override,
1443 	 .ident = "HP NX6125 laptop",
1444 	 .matches = {
1445 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1446 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1447 		     },
1448 	 },
1449 	{
1450 	 .callback = dmi_ignore_irq0_timer_override,
1451 	 .ident = "HP NX6325 laptop",
1452 	 .matches = {
1453 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1454 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1455 		     },
1456 	 },
1457 	{
1458 	 .callback = dmi_ignore_irq0_timer_override,
1459 	 .ident = "HP 6715b laptop",
1460 	 .matches = {
1461 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1462 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1463 		     },
1464 	 },
1465 	{
1466 	 .callback = dmi_ignore_irq0_timer_override,
1467 	 .ident = "FUJITSU SIEMENS",
1468 	 .matches = {
1469 		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1470 		     DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1471 		     },
1472 	 },
1473 	{}
1474 };
1475 
1476 /*
1477  * acpi_boot_table_init() and acpi_boot_init()
1478  *  called from setup_arch(), always.
1479  *	1. checksums all tables
1480  *	2. enumerates lapics
1481  *	3. enumerates io-apics
1482  *
1483  * acpi_table_init() is separate to allow reading SRAT without
1484  * other side effects.
1485  *
1486  * side effects of acpi_boot_init:
1487  *	acpi_lapic = 1 if LAPIC found
1488  *	acpi_ioapic = 1 if IOAPIC found
1489  *	if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1490  *	if acpi_blacklisted() acpi_disabled = 1;
1491  *	acpi_irq_model=...
1492  *	...
1493  */
1494 
1495 void __init acpi_boot_table_init(void)
1496 {
1497 	dmi_check_system(acpi_dmi_table);
1498 
1499 	/*
1500 	 * If acpi_disabled, bail out
1501 	 */
1502 	if (acpi_disabled)
1503 		return;
1504 
1505 	/*
1506 	 * Initialize the ACPI boot-time table parser.
1507 	 */
1508 	if (acpi_table_init()) {
1509 		disable_acpi();
1510 		return;
1511 	}
1512 
1513 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1514 
1515 	/*
1516 	 * blacklist may disable ACPI entirely
1517 	 */
1518 	if (acpi_blacklisted()) {
1519 		if (acpi_force) {
1520 			printk(KERN_WARNING PREFIX "acpi=force override\n");
1521 		} else {
1522 			printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1523 			disable_acpi();
1524 			return;
1525 		}
1526 	}
1527 }
1528 
1529 int __init early_acpi_boot_init(void)
1530 {
1531 	/*
1532 	 * If acpi_disabled, bail out
1533 	 */
1534 	if (acpi_disabled)
1535 		return 1;
1536 
1537 	/*
1538 	 * Process the Multiple APIC Description Table (MADT), if present
1539 	 */
1540 	early_acpi_process_madt();
1541 
1542 	/*
1543 	 * Hardware-reduced ACPI mode initialization:
1544 	 */
1545 	acpi_reduced_hw_init();
1546 
1547 	return 0;
1548 }
1549 
1550 int __init acpi_boot_init(void)
1551 {
1552 	/* those are executed after early-quirks are executed */
1553 	dmi_check_system(acpi_dmi_table_late);
1554 
1555 	/*
1556 	 * If acpi_disabled, bail out
1557 	 */
1558 	if (acpi_disabled)
1559 		return 1;
1560 
1561 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1562 
1563 	/*
1564 	 * set sci_int and PM timer address
1565 	 */
1566 	acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1567 
1568 	/*
1569 	 * Process the Multiple APIC Description Table (MADT), if present
1570 	 */
1571 	acpi_process_madt();
1572 
1573 	acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1574 
1575 	if (!acpi_noirq)
1576 		x86_init.pci.init = pci_acpi_init;
1577 
1578 	return 0;
1579 }
1580 
1581 static int __init parse_acpi(char *arg)
1582 {
1583 	if (!arg)
1584 		return -EINVAL;
1585 
1586 	/* "acpi=off" disables both ACPI table parsing and interpreter */
1587 	if (strcmp(arg, "off") == 0) {
1588 		disable_acpi();
1589 	}
1590 	/* acpi=force to over-ride black-list */
1591 	else if (strcmp(arg, "force") == 0) {
1592 		acpi_force = 1;
1593 		acpi_disabled = 0;
1594 	}
1595 	/* acpi=strict disables out-of-spec workarounds */
1596 	else if (strcmp(arg, "strict") == 0) {
1597 		acpi_strict = 1;
1598 	}
1599 	/* acpi=rsdt use RSDT instead of XSDT */
1600 	else if (strcmp(arg, "rsdt") == 0) {
1601 		acpi_gbl_do_not_use_xsdt = TRUE;
1602 	}
1603 	/* "acpi=noirq" disables ACPI interrupt routing */
1604 	else if (strcmp(arg, "noirq") == 0) {
1605 		acpi_noirq_set();
1606 	}
1607 	/* "acpi=copy_dsdt" copys DSDT */
1608 	else if (strcmp(arg, "copy_dsdt") == 0) {
1609 		acpi_gbl_copy_dsdt_locally = 1;
1610 	}
1611 	/* "acpi=nocmcff" disables FF mode for corrected errors */
1612 	else if (strcmp(arg, "nocmcff") == 0) {
1613 		acpi_disable_cmcff = 1;
1614 	} else {
1615 		/* Core will printk when we return error. */
1616 		return -EINVAL;
1617 	}
1618 	return 0;
1619 }
1620 early_param("acpi", parse_acpi);
1621 
1622 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1623 static int __init parse_pci(char *arg)
1624 {
1625 	if (arg && strcmp(arg, "noacpi") == 0)
1626 		acpi_disable_pci();
1627 	return 0;
1628 }
1629 early_param("pci", parse_pci);
1630 
1631 int __init acpi_mps_check(void)
1632 {
1633 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1634 /* mptable code is not built-in*/
1635 	if (acpi_disabled || acpi_noirq) {
1636 		printk(KERN_WARNING "MPS support code is not built-in.\n"
1637 		       "Using acpi=off or acpi=noirq or pci=noacpi "
1638 		       "may have problem\n");
1639 		return 1;
1640 	}
1641 #endif
1642 	return 0;
1643 }
1644 
1645 #ifdef CONFIG_X86_IO_APIC
1646 static int __init parse_acpi_skip_timer_override(char *arg)
1647 {
1648 	acpi_skip_timer_override = 1;
1649 	return 0;
1650 }
1651 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1652 
1653 static int __init parse_acpi_use_timer_override(char *arg)
1654 {
1655 	acpi_use_timer_override = 1;
1656 	return 0;
1657 }
1658 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1659 #endif /* CONFIG_X86_IO_APIC */
1660 
1661 static int __init setup_acpi_sci(char *s)
1662 {
1663 	if (!s)
1664 		return -EINVAL;
1665 	if (!strcmp(s, "edge"))
1666 		acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1667 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1668 	else if (!strcmp(s, "level"))
1669 		acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1670 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1671 	else if (!strcmp(s, "high"))
1672 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1673 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1674 	else if (!strcmp(s, "low"))
1675 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1676 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1677 	else
1678 		return -EINVAL;
1679 	return 0;
1680 }
1681 early_param("acpi_sci", setup_acpi_sci);
1682 
1683 int __acpi_acquire_global_lock(unsigned int *lock)
1684 {
1685 	unsigned int old, new, val;
1686 	do {
1687 		old = *lock;
1688 		new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1689 		val = cmpxchg(lock, old, new);
1690 	} while (unlikely (val != old));
1691 	return (new < 3) ? -1 : 0;
1692 }
1693 
1694 int __acpi_release_global_lock(unsigned int *lock)
1695 {
1696 	unsigned int old, new, val;
1697 	do {
1698 		old = *lock;
1699 		new = old & ~0x3;
1700 		val = cmpxchg(lock, old, new);
1701 	} while (unlikely (val != old));
1702 	return old & 0x1;
1703 }
1704 
1705 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1706 {
1707 	e820_add_region(addr, size, E820_ACPI);
1708 	update_e820();
1709 }
1710