xref: /openbmc/linux/arch/x86/kernel/acpi/boot.c (revision abfbd895)
1 /*
2  *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
3  *
4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or
12  *  (at your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful,
15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *  GNU General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License
20  *  along with this program; if not, write to the Free Software
21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  */
25 
26 #include <linux/init.h>
27 #include <linux/acpi.h>
28 #include <linux/acpi_pmtmr.h>
29 #include <linux/efi.h>
30 #include <linux/cpumask.h>
31 #include <linux/module.h>
32 #include <linux/dmi.h>
33 #include <linux/irq.h>
34 #include <linux/slab.h>
35 #include <linux/bootmem.h>
36 #include <linux/ioport.h>
37 #include <linux/pci.h>
38 
39 #include <asm/irqdomain.h>
40 #include <asm/pci_x86.h>
41 #include <asm/pgtable.h>
42 #include <asm/io_apic.h>
43 #include <asm/apic.h>
44 #include <asm/io.h>
45 #include <asm/mpspec.h>
46 #include <asm/smp.h>
47 #include <asm/i8259.h>
48 
49 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
50 static int __initdata acpi_force = 0;
51 int acpi_disabled;
52 EXPORT_SYMBOL(acpi_disabled);
53 
54 #ifdef	CONFIG_X86_64
55 # include <asm/proto.h>
56 #endif				/* X86 */
57 
58 #define PREFIX			"ACPI: "
59 
60 int acpi_noirq;				/* skip ACPI IRQ initialization */
61 int acpi_pci_disabled;		/* skip ACPI PCI scan and IRQ initialization */
62 EXPORT_SYMBOL(acpi_pci_disabled);
63 
64 int acpi_lapic;
65 int acpi_ioapic;
66 int acpi_strict;
67 int acpi_disable_cmcff;
68 
69 u8 acpi_sci_flags __initdata;
70 int acpi_sci_override_gsi __initdata;
71 int acpi_skip_timer_override __initdata;
72 int acpi_use_timer_override __initdata;
73 int acpi_fix_pin2_polarity __initdata;
74 
75 #ifdef CONFIG_X86_LOCAL_APIC
76 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
77 #endif
78 
79 /*
80  * Locks related to IOAPIC hotplug
81  * Hotplug side:
82  *	->device_hotplug_lock
83  *		->acpi_ioapic_lock
84  *			->ioapic_lock
85  * Interrupt mapping side:
86  *	->acpi_ioapic_lock
87  *		->ioapic_mutex
88  *			->ioapic_lock
89  */
90 static DEFINE_MUTEX(acpi_ioapic_lock);
91 
92 /* --------------------------------------------------------------------------
93                               Boot-time Configuration
94    -------------------------------------------------------------------------- */
95 
96 /*
97  * The default interrupt routing model is PIC (8259).  This gets
98  * overridden if IOAPICs are enumerated (below).
99  */
100 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
101 
102 
103 /*
104  * ISA irqs by default are the first 16 gsis but can be
105  * any gsi as specified by an interrupt source override.
106  */
107 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
108 	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
109 };
110 
111 #define	ACPI_INVALID_GSI		INT_MIN
112 
113 /*
114  * This is just a simple wrapper around early_ioremap(),
115  * with sanity checks for phys == 0 and size == 0.
116  */
117 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
118 {
119 
120 	if (!phys || !size)
121 		return NULL;
122 
123 	return early_ioremap(phys, size);
124 }
125 
126 void __init __acpi_unmap_table(char *map, unsigned long size)
127 {
128 	if (!map || !size)
129 		return;
130 
131 	early_iounmap(map, size);
132 }
133 
134 #ifdef CONFIG_X86_LOCAL_APIC
135 static int __init acpi_parse_madt(struct acpi_table_header *table)
136 {
137 	struct acpi_table_madt *madt = NULL;
138 
139 	if (!cpu_has_apic)
140 		return -EINVAL;
141 
142 	madt = (struct acpi_table_madt *)table;
143 	if (!madt) {
144 		printk(KERN_WARNING PREFIX "Unable to map MADT\n");
145 		return -ENODEV;
146 	}
147 
148 	if (madt->address) {
149 		acpi_lapic_addr = (u64) madt->address;
150 
151 		printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
152 		       madt->address);
153 	}
154 
155 	default_acpi_madt_oem_check(madt->header.oem_id,
156 				    madt->header.oem_table_id);
157 
158 	return 0;
159 }
160 
161 /**
162  * acpi_register_lapic - register a local apic and generates a logic cpu number
163  * @id: local apic id to register
164  * @enabled: this cpu is enabled or not
165  *
166  * Returns the logic cpu number which maps to the local apic
167  */
168 static int acpi_register_lapic(int id, u8 enabled)
169 {
170 	unsigned int ver = 0;
171 
172 	if (id >= MAX_LOCAL_APIC) {
173 		printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
174 		return -EINVAL;
175 	}
176 
177 	if (!enabled) {
178 		++disabled_cpus;
179 		return -EINVAL;
180 	}
181 
182 	if (boot_cpu_physical_apicid != -1U)
183 		ver = apic_version[boot_cpu_physical_apicid];
184 
185 	return generic_processor_info(id, ver);
186 }
187 
188 static int __init
189 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
190 {
191 	struct acpi_madt_local_x2apic *processor = NULL;
192 	int apic_id;
193 	u8 enabled;
194 
195 	processor = (struct acpi_madt_local_x2apic *)header;
196 
197 	if (BAD_MADT_ENTRY(processor, end))
198 		return -EINVAL;
199 
200 	acpi_table_print_madt_entry(header);
201 
202 	apic_id = processor->local_apic_id;
203 	enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
204 #ifdef CONFIG_X86_X2APIC
205 	/*
206 	 * We need to register disabled CPU as well to permit
207 	 * counting disabled CPUs. This allows us to size
208 	 * cpus_possible_map more accurately, to permit
209 	 * to not preallocating memory for all NR_CPUS
210 	 * when we use CPU hotplug.
211 	 */
212 	if (!apic->apic_id_valid(apic_id) && enabled)
213 		printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
214 	else
215 		acpi_register_lapic(apic_id, enabled);
216 #else
217 	printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
218 #endif
219 
220 	return 0;
221 }
222 
223 static int __init
224 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
225 {
226 	struct acpi_madt_local_apic *processor = NULL;
227 
228 	processor = (struct acpi_madt_local_apic *)header;
229 
230 	if (BAD_MADT_ENTRY(processor, end))
231 		return -EINVAL;
232 
233 	acpi_table_print_madt_entry(header);
234 
235 	/*
236 	 * We need to register disabled CPU as well to permit
237 	 * counting disabled CPUs. This allows us to size
238 	 * cpus_possible_map more accurately, to permit
239 	 * to not preallocating memory for all NR_CPUS
240 	 * when we use CPU hotplug.
241 	 */
242 	acpi_register_lapic(processor->id,	/* APIC ID */
243 			    processor->lapic_flags & ACPI_MADT_ENABLED);
244 
245 	return 0;
246 }
247 
248 static int __init
249 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
250 {
251 	struct acpi_madt_local_sapic *processor = NULL;
252 
253 	processor = (struct acpi_madt_local_sapic *)header;
254 
255 	if (BAD_MADT_ENTRY(processor, end))
256 		return -EINVAL;
257 
258 	acpi_table_print_madt_entry(header);
259 
260 	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
261 			    processor->lapic_flags & ACPI_MADT_ENABLED);
262 
263 	return 0;
264 }
265 
266 static int __init
267 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
268 			  const unsigned long end)
269 {
270 	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
271 
272 	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
273 
274 	if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
275 		return -EINVAL;
276 
277 	acpi_lapic_addr = lapic_addr_ovr->address;
278 
279 	return 0;
280 }
281 
282 static int __init
283 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
284 		      const unsigned long end)
285 {
286 	struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
287 
288 	x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
289 
290 	if (BAD_MADT_ENTRY(x2apic_nmi, end))
291 		return -EINVAL;
292 
293 	acpi_table_print_madt_entry(header);
294 
295 	if (x2apic_nmi->lint != 1)
296 		printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
297 
298 	return 0;
299 }
300 
301 static int __init
302 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
303 {
304 	struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
305 
306 	lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
307 
308 	if (BAD_MADT_ENTRY(lapic_nmi, end))
309 		return -EINVAL;
310 
311 	acpi_table_print_madt_entry(header);
312 
313 	if (lapic_nmi->lint != 1)
314 		printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
315 
316 	return 0;
317 }
318 
319 #endif				/*CONFIG_X86_LOCAL_APIC */
320 
321 #ifdef CONFIG_X86_IO_APIC
322 #define MP_ISA_BUS		0
323 
324 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
325 					  u32 gsi)
326 {
327 	int ioapic;
328 	int pin;
329 	struct mpc_intsrc mp_irq;
330 
331 	/*
332 	 * Convert 'gsi' to 'ioapic.pin'.
333 	 */
334 	ioapic = mp_find_ioapic(gsi);
335 	if (ioapic < 0)
336 		return;
337 	pin = mp_find_ioapic_pin(ioapic, gsi);
338 
339 	/*
340 	 * TBD: This check is for faulty timer entries, where the override
341 	 *      erroneously sets the trigger to level, resulting in a HUGE
342 	 *      increase of timer interrupts!
343 	 */
344 	if ((bus_irq == 0) && (trigger == 3))
345 		trigger = 1;
346 
347 	mp_irq.type = MP_INTSRC;
348 	mp_irq.irqtype = mp_INT;
349 	mp_irq.irqflag = (trigger << 2) | polarity;
350 	mp_irq.srcbus = MP_ISA_BUS;
351 	mp_irq.srcbusirq = bus_irq;	/* IRQ */
352 	mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
353 	mp_irq.dstirq = pin;	/* INTIN# */
354 
355 	mp_save_irq(&mp_irq);
356 
357 	/*
358 	 * Reset default identity mapping if gsi is also an legacy IRQ,
359 	 * otherwise there will be more than one entry with the same GSI
360 	 * and acpi_isa_irq_to_gsi() may give wrong result.
361 	 */
362 	if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
363 		isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
364 	isa_irq_to_gsi[bus_irq] = gsi;
365 }
366 
367 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
368 			int polarity)
369 {
370 #ifdef CONFIG_X86_MPPARSE
371 	struct mpc_intsrc mp_irq;
372 	struct pci_dev *pdev;
373 	unsigned char number;
374 	unsigned int devfn;
375 	int ioapic;
376 	u8 pin;
377 
378 	if (!acpi_ioapic)
379 		return 0;
380 	if (!dev || !dev_is_pci(dev))
381 		return 0;
382 
383 	pdev = to_pci_dev(dev);
384 	number = pdev->bus->number;
385 	devfn = pdev->devfn;
386 	pin = pdev->pin;
387 	/* print the entry should happen on mptable identically */
388 	mp_irq.type = MP_INTSRC;
389 	mp_irq.irqtype = mp_INT;
390 	mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
391 				(polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
392 	mp_irq.srcbus = number;
393 	mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
394 	ioapic = mp_find_ioapic(gsi);
395 	mp_irq.dstapic = mpc_ioapic_id(ioapic);
396 	mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
397 
398 	mp_save_irq(&mp_irq);
399 #endif
400 	return 0;
401 }
402 
403 static int __init
404 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
405 {
406 	struct acpi_madt_io_apic *ioapic = NULL;
407 	struct ioapic_domain_cfg cfg = {
408 		.type = IOAPIC_DOMAIN_DYNAMIC,
409 		.ops = &mp_ioapic_irqdomain_ops,
410 	};
411 
412 	ioapic = (struct acpi_madt_io_apic *)header;
413 
414 	if (BAD_MADT_ENTRY(ioapic, end))
415 		return -EINVAL;
416 
417 	acpi_table_print_madt_entry(header);
418 
419 	/* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
420 	if (ioapic->global_irq_base < nr_legacy_irqs())
421 		cfg.type = IOAPIC_DOMAIN_LEGACY;
422 
423 	mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
424 			   &cfg);
425 
426 	return 0;
427 }
428 
429 /*
430  * Parse Interrupt Source Override for the ACPI SCI
431  */
432 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
433 {
434 	if (trigger == 0)	/* compatible SCI trigger is level */
435 		trigger = 3;
436 
437 	if (polarity == 0)	/* compatible SCI polarity is low */
438 		polarity = 3;
439 
440 	/* Command-line over-ride via acpi_sci= */
441 	if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
442 		trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
443 
444 	if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
445 		polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
446 
447 	mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
448 	acpi_penalize_sci_irq(bus_irq, trigger, polarity);
449 
450 	/*
451 	 * stash over-ride to indicate we've been here
452 	 * and for later update of acpi_gbl_FADT
453 	 */
454 	acpi_sci_override_gsi = gsi;
455 	return;
456 }
457 
458 static int __init
459 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
460 		       const unsigned long end)
461 {
462 	struct acpi_madt_interrupt_override *intsrc = NULL;
463 
464 	intsrc = (struct acpi_madt_interrupt_override *)header;
465 
466 	if (BAD_MADT_ENTRY(intsrc, end))
467 		return -EINVAL;
468 
469 	acpi_table_print_madt_entry(header);
470 
471 	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
472 		acpi_sci_ioapic_setup(intsrc->source_irq,
473 				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
474 				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
475 				      intsrc->global_irq);
476 		return 0;
477 	}
478 
479 	if (intsrc->source_irq == 0) {
480 		if (acpi_skip_timer_override) {
481 			printk(PREFIX "BIOS IRQ0 override ignored.\n");
482 			return 0;
483 		}
484 
485 		if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
486 			&& (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
487 			intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
488 			printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
489 		}
490 	}
491 
492 	mp_override_legacy_irq(intsrc->source_irq,
493 				intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
494 				(intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
495 				intsrc->global_irq);
496 
497 	return 0;
498 }
499 
500 static int __init
501 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
502 {
503 	struct acpi_madt_nmi_source *nmi_src = NULL;
504 
505 	nmi_src = (struct acpi_madt_nmi_source *)header;
506 
507 	if (BAD_MADT_ENTRY(nmi_src, end))
508 		return -EINVAL;
509 
510 	acpi_table_print_madt_entry(header);
511 
512 	/* TBD: Support nimsrc entries? */
513 
514 	return 0;
515 }
516 
517 #endif				/* CONFIG_X86_IO_APIC */
518 
519 /*
520  * acpi_pic_sci_set_trigger()
521  *
522  * use ELCR to set PIC-mode trigger type for SCI
523  *
524  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
525  * it may require Edge Trigger -- use "acpi_sci=edge"
526  *
527  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
528  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
529  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
530  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
531  */
532 
533 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
534 {
535 	unsigned int mask = 1 << irq;
536 	unsigned int old, new;
537 
538 	/* Real old ELCR mask */
539 	old = inb(0x4d0) | (inb(0x4d1) << 8);
540 
541 	/*
542 	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
543 	 * since we will set it correctly as we enable the PCI irq
544 	 * routing.
545 	 */
546 	new = acpi_noirq ? old : 0;
547 
548 	/*
549 	 * Update SCI information in the ELCR, it isn't in the PCI
550 	 * routing tables..
551 	 */
552 	switch (trigger) {
553 	case 1:		/* Edge - clear */
554 		new &= ~mask;
555 		break;
556 	case 3:		/* Level - set */
557 		new |= mask;
558 		break;
559 	}
560 
561 	if (old == new)
562 		return;
563 
564 	printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
565 	outb(new, 0x4d0);
566 	outb(new >> 8, 0x4d1);
567 }
568 
569 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
570 {
571 	int rc, irq, trigger, polarity;
572 
573 	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
574 		*irqp = gsi;
575 		return 0;
576 	}
577 
578 	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
579 	if (rc == 0) {
580 		trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
581 		polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
582 		irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
583 		if (irq >= 0) {
584 			*irqp = irq;
585 			return 0;
586 		}
587 	}
588 
589 	return -1;
590 }
591 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
592 
593 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
594 {
595 	if (isa_irq < nr_legacy_irqs() &&
596 	    isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
597 		*gsi = isa_irq_to_gsi[isa_irq];
598 		return 0;
599 	}
600 
601 	return -1;
602 }
603 
604 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
605 				 int trigger, int polarity)
606 {
607 #ifdef CONFIG_PCI
608 	/*
609 	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
610 	 */
611 	if (trigger == ACPI_LEVEL_SENSITIVE)
612 		elcr_set_level_irq(gsi);
613 #endif
614 
615 	return gsi;
616 }
617 
618 #ifdef CONFIG_X86_LOCAL_APIC
619 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
620 				    int trigger, int polarity)
621 {
622 	int irq = gsi;
623 #ifdef CONFIG_X86_IO_APIC
624 	int node;
625 	struct irq_alloc_info info;
626 
627 	node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
628 	trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
629 	polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
630 	ioapic_set_alloc_attr(&info, node, trigger, polarity);
631 
632 	mutex_lock(&acpi_ioapic_lock);
633 	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
634 	/* Don't set up the ACPI SCI because it's already set up */
635 	if (irq >= 0 && enable_update_mptable &&
636 	    acpi_gbl_FADT.sci_interrupt != gsi)
637 		mp_config_acpi_gsi(dev, gsi, trigger, polarity);
638 	mutex_unlock(&acpi_ioapic_lock);
639 #endif
640 
641 	return irq;
642 }
643 
644 static void acpi_unregister_gsi_ioapic(u32 gsi)
645 {
646 #ifdef CONFIG_X86_IO_APIC
647 	int irq;
648 
649 	mutex_lock(&acpi_ioapic_lock);
650 	irq = mp_map_gsi_to_irq(gsi, 0, NULL);
651 	if (irq > 0)
652 		mp_unmap_irq(irq);
653 	mutex_unlock(&acpi_ioapic_lock);
654 #endif
655 }
656 #endif
657 
658 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
659 			   int trigger, int polarity) = acpi_register_gsi_pic;
660 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
661 
662 #ifdef CONFIG_ACPI_SLEEP
663 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
664 #else
665 int (*acpi_suspend_lowlevel)(void);
666 #endif
667 
668 /*
669  * success: return IRQ number (>=0)
670  * failure: return < 0
671  */
672 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
673 {
674 	return __acpi_register_gsi(dev, gsi, trigger, polarity);
675 }
676 EXPORT_SYMBOL_GPL(acpi_register_gsi);
677 
678 void acpi_unregister_gsi(u32 gsi)
679 {
680 	if (__acpi_unregister_gsi)
681 		__acpi_unregister_gsi(gsi);
682 }
683 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
684 
685 #ifdef CONFIG_X86_LOCAL_APIC
686 static void __init acpi_set_irq_model_ioapic(void)
687 {
688 	acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
689 	__acpi_register_gsi = acpi_register_gsi_ioapic;
690 	__acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
691 	acpi_ioapic = 1;
692 }
693 #endif
694 
695 /*
696  *  ACPI based hotplug support for CPU
697  */
698 #ifdef CONFIG_ACPI_HOTPLUG_CPU
699 #include <acpi/processor.h>
700 
701 static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
702 {
703 #ifdef CONFIG_ACPI_NUMA
704 	int nid;
705 
706 	nid = acpi_get_node(handle);
707 	if (nid != -1) {
708 		set_apicid_to_node(physid, nid);
709 		numa_set_node(cpu, nid);
710 	}
711 #endif
712 }
713 
714 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
715 {
716 	int cpu;
717 
718 	cpu = acpi_register_lapic(physid, ACPI_MADT_ENABLED);
719 	if (cpu < 0) {
720 		pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
721 		return cpu;
722 	}
723 
724 	acpi_processor_set_pdc(handle);
725 	acpi_map_cpu2node(handle, cpu, physid);
726 
727 	*pcpu = cpu;
728 	return 0;
729 }
730 EXPORT_SYMBOL(acpi_map_cpu);
731 
732 int acpi_unmap_cpu(int cpu)
733 {
734 #ifdef CONFIG_ACPI_NUMA
735 	set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
736 #endif
737 
738 	per_cpu(x86_cpu_to_apicid, cpu) = -1;
739 	set_cpu_present(cpu, false);
740 	num_processors--;
741 
742 	return (0);
743 }
744 EXPORT_SYMBOL(acpi_unmap_cpu);
745 #endif				/* CONFIG_ACPI_HOTPLUG_CPU */
746 
747 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
748 {
749 	int ret = -ENOSYS;
750 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
751 	int ioapic_id;
752 	u64 addr;
753 	struct ioapic_domain_cfg cfg = {
754 		.type = IOAPIC_DOMAIN_DYNAMIC,
755 		.ops = &mp_ioapic_irqdomain_ops,
756 	};
757 
758 	ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
759 	if (ioapic_id < 0) {
760 		unsigned long long uid;
761 		acpi_status status;
762 
763 		status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
764 					       NULL, &uid);
765 		if (ACPI_FAILURE(status)) {
766 			acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
767 			return -EINVAL;
768 		}
769 		ioapic_id = (int)uid;
770 	}
771 
772 	mutex_lock(&acpi_ioapic_lock);
773 	ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
774 	mutex_unlock(&acpi_ioapic_lock);
775 #endif
776 
777 	return ret;
778 }
779 EXPORT_SYMBOL(acpi_register_ioapic);
780 
781 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
782 {
783 	int ret = -ENOSYS;
784 
785 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
786 	mutex_lock(&acpi_ioapic_lock);
787 	ret  = mp_unregister_ioapic(gsi_base);
788 	mutex_unlock(&acpi_ioapic_lock);
789 #endif
790 
791 	return ret;
792 }
793 EXPORT_SYMBOL(acpi_unregister_ioapic);
794 
795 /**
796  * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
797  *			    has been registered
798  * @handle:	ACPI handle of the IOAPIC deivce
799  * @gsi_base:	GSI base associated with the IOAPIC
800  *
801  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
802  * with acpi_register_ioapic()/acpi_unregister_ioapic().
803  */
804 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
805 {
806 	int ret = 0;
807 
808 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
809 	mutex_lock(&acpi_ioapic_lock);
810 	ret  = mp_ioapic_registered(gsi_base);
811 	mutex_unlock(&acpi_ioapic_lock);
812 #endif
813 
814 	return ret;
815 }
816 
817 static int __init acpi_parse_sbf(struct acpi_table_header *table)
818 {
819 	struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
820 
821 	sbf_port = sb->cmos_index;	/* Save CMOS port */
822 
823 	return 0;
824 }
825 
826 #ifdef CONFIG_HPET_TIMER
827 #include <asm/hpet.h>
828 
829 static struct resource *hpet_res __initdata;
830 
831 static int __init acpi_parse_hpet(struct acpi_table_header *table)
832 {
833 	struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
834 
835 	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
836 		printk(KERN_WARNING PREFIX "HPET timers must be located in "
837 		       "memory.\n");
838 		return -1;
839 	}
840 
841 	hpet_address = hpet_tbl->address.address;
842 	hpet_blockid = hpet_tbl->sequence;
843 
844 	/*
845 	 * Some broken BIOSes advertise HPET at 0x0. We really do not
846 	 * want to allocate a resource there.
847 	 */
848 	if (!hpet_address) {
849 		printk(KERN_WARNING PREFIX
850 		       "HPET id: %#x base: %#lx is invalid\n",
851 		       hpet_tbl->id, hpet_address);
852 		return 0;
853 	}
854 #ifdef CONFIG_X86_64
855 	/*
856 	 * Some even more broken BIOSes advertise HPET at
857 	 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
858 	 * some noise:
859 	 */
860 	if (hpet_address == 0xfed0000000000000UL) {
861 		if (!hpet_force_user) {
862 			printk(KERN_WARNING PREFIX "HPET id: %#x "
863 			       "base: 0xfed0000000000000 is bogus\n "
864 			       "try hpet=force on the kernel command line to "
865 			       "fix it up to 0xfed00000.\n", hpet_tbl->id);
866 			hpet_address = 0;
867 			return 0;
868 		}
869 		printk(KERN_WARNING PREFIX
870 		       "HPET id: %#x base: 0xfed0000000000000 fixed up "
871 		       "to 0xfed00000.\n", hpet_tbl->id);
872 		hpet_address >>= 32;
873 	}
874 #endif
875 	printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
876 	       hpet_tbl->id, hpet_address);
877 
878 	/*
879 	 * Allocate and initialize the HPET firmware resource for adding into
880 	 * the resource tree during the lateinit timeframe.
881 	 */
882 #define HPET_RESOURCE_NAME_SIZE 9
883 	hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
884 
885 	hpet_res->name = (void *)&hpet_res[1];
886 	hpet_res->flags = IORESOURCE_MEM;
887 	snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
888 		 hpet_tbl->sequence);
889 
890 	hpet_res->start = hpet_address;
891 	hpet_res->end = hpet_address + (1 * 1024) - 1;
892 
893 	return 0;
894 }
895 
896 /*
897  * hpet_insert_resource inserts the HPET resources used into the resource
898  * tree.
899  */
900 static __init int hpet_insert_resource(void)
901 {
902 	if (!hpet_res)
903 		return 1;
904 
905 	return insert_resource(&iomem_resource, hpet_res);
906 }
907 
908 late_initcall(hpet_insert_resource);
909 
910 #else
911 #define	acpi_parse_hpet	NULL
912 #endif
913 
914 static int __init acpi_parse_fadt(struct acpi_table_header *table)
915 {
916 
917 #ifdef CONFIG_X86_PM_TIMER
918 	/* detect the location of the ACPI PM Timer */
919 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
920 		/* FADT rev. 2 */
921 		if (acpi_gbl_FADT.xpm_timer_block.space_id !=
922 		    ACPI_ADR_SPACE_SYSTEM_IO)
923 			return 0;
924 
925 		pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
926 		/*
927 		 * "X" fields are optional extensions to the original V1.0
928 		 * fields, so we must selectively expand V1.0 fields if the
929 		 * corresponding X field is zero.
930 	 	 */
931 		if (!pmtmr_ioport)
932 			pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
933 	} else {
934 		/* FADT rev. 1 */
935 		pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
936 	}
937 	if (pmtmr_ioport)
938 		printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
939 		       pmtmr_ioport);
940 #endif
941 	return 0;
942 }
943 
944 #ifdef	CONFIG_X86_LOCAL_APIC
945 /*
946  * Parse LAPIC entries in MADT
947  * returns 0 on success, < 0 on error
948  */
949 
950 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
951 {
952 	int count;
953 
954 	if (!cpu_has_apic)
955 		return -ENODEV;
956 
957 	/*
958 	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
959 	 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
960 	 */
961 
962 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
963 				      acpi_parse_lapic_addr_ovr, 0);
964 	if (count < 0) {
965 		printk(KERN_ERR PREFIX
966 		       "Error parsing LAPIC address override entry\n");
967 		return count;
968 	}
969 
970 	register_lapic_address(acpi_lapic_addr);
971 
972 	return count;
973 }
974 
975 static int __init acpi_parse_madt_lapic_entries(void)
976 {
977 	int count;
978 	int x2count = 0;
979 	int ret;
980 	struct acpi_subtable_proc madt_proc[2];
981 
982 	if (!cpu_has_apic)
983 		return -ENODEV;
984 
985 	/*
986 	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
987 	 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
988 	 */
989 
990 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
991 				      acpi_parse_lapic_addr_ovr, 0);
992 	if (count < 0) {
993 		printk(KERN_ERR PREFIX
994 		       "Error parsing LAPIC address override entry\n");
995 		return count;
996 	}
997 
998 	register_lapic_address(acpi_lapic_addr);
999 
1000 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1001 				      acpi_parse_sapic, MAX_LOCAL_APIC);
1002 
1003 	if (!count) {
1004 		memset(madt_proc, 0, sizeof(madt_proc));
1005 		madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1006 		madt_proc[0].handler = acpi_parse_lapic;
1007 		madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1008 		madt_proc[1].handler = acpi_parse_x2apic;
1009 		ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1010 				sizeof(struct acpi_table_madt),
1011 				madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1012 		if (ret < 0) {
1013 			printk(KERN_ERR PREFIX
1014 					"Error parsing LAPIC/X2APIC entries\n");
1015 			return ret;
1016 		}
1017 
1018 		x2count = madt_proc[0].count;
1019 		count = madt_proc[1].count;
1020 	}
1021 	if (!count && !x2count) {
1022 		printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1023 		/* TBD: Cleanup to allow fallback to MPS */
1024 		return -ENODEV;
1025 	} else if (count < 0 || x2count < 0) {
1026 		printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1027 		/* TBD: Cleanup to allow fallback to MPS */
1028 		return count;
1029 	}
1030 
1031 	x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1032 					acpi_parse_x2apic_nmi, 0);
1033 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1034 				      acpi_parse_lapic_nmi, 0);
1035 	if (count < 0 || x2count < 0) {
1036 		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1037 		/* TBD: Cleanup to allow fallback to MPS */
1038 		return count;
1039 	}
1040 	return 0;
1041 }
1042 #endif				/* CONFIG_X86_LOCAL_APIC */
1043 
1044 #ifdef	CONFIG_X86_IO_APIC
1045 static void __init mp_config_acpi_legacy_irqs(void)
1046 {
1047 	int i;
1048 	struct mpc_intsrc mp_irq;
1049 
1050 #ifdef CONFIG_EISA
1051 	/*
1052 	 * Fabricate the legacy ISA bus (bus #31).
1053 	 */
1054 	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1055 #endif
1056 	set_bit(MP_ISA_BUS, mp_bus_not_pci);
1057 	pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1058 
1059 	/*
1060 	 * Use the default configuration for the IRQs 0-15.  Unless
1061 	 * overridden by (MADT) interrupt source override entries.
1062 	 */
1063 	for (i = 0; i < nr_legacy_irqs(); i++) {
1064 		int ioapic, pin;
1065 		unsigned int dstapic;
1066 		int idx;
1067 		u32 gsi;
1068 
1069 		/* Locate the gsi that irq i maps to. */
1070 		if (acpi_isa_irq_to_gsi(i, &gsi))
1071 			continue;
1072 
1073 		/*
1074 		 * Locate the IOAPIC that manages the ISA IRQ.
1075 		 */
1076 		ioapic = mp_find_ioapic(gsi);
1077 		if (ioapic < 0)
1078 			continue;
1079 		pin = mp_find_ioapic_pin(ioapic, gsi);
1080 		dstapic = mpc_ioapic_id(ioapic);
1081 
1082 		for (idx = 0; idx < mp_irq_entries; idx++) {
1083 			struct mpc_intsrc *irq = mp_irqs + idx;
1084 
1085 			/* Do we already have a mapping for this ISA IRQ? */
1086 			if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1087 				break;
1088 
1089 			/* Do we already have a mapping for this IOAPIC pin */
1090 			if (irq->dstapic == dstapic && irq->dstirq == pin)
1091 				break;
1092 		}
1093 
1094 		if (idx != mp_irq_entries) {
1095 			printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1096 			continue;	/* IRQ already used */
1097 		}
1098 
1099 		mp_irq.type = MP_INTSRC;
1100 		mp_irq.irqflag = 0;	/* Conforming */
1101 		mp_irq.srcbus = MP_ISA_BUS;
1102 		mp_irq.dstapic = dstapic;
1103 		mp_irq.irqtype = mp_INT;
1104 		mp_irq.srcbusirq = i; /* Identity mapped */
1105 		mp_irq.dstirq = pin;
1106 
1107 		mp_save_irq(&mp_irq);
1108 	}
1109 }
1110 
1111 /*
1112  * Parse IOAPIC related entries in MADT
1113  * returns 0 on success, < 0 on error
1114  */
1115 static int __init acpi_parse_madt_ioapic_entries(void)
1116 {
1117 	int count;
1118 
1119 	/*
1120 	 * ACPI interpreter is required to complete interrupt setup,
1121 	 * so if it is off, don't enumerate the io-apics with ACPI.
1122 	 * If MPS is present, it will handle them,
1123 	 * otherwise the system will stay in PIC mode
1124 	 */
1125 	if (acpi_disabled || acpi_noirq)
1126 		return -ENODEV;
1127 
1128 	if (!cpu_has_apic)
1129 		return -ENODEV;
1130 
1131 	/*
1132 	 * if "noapic" boot option, don't look for IO-APICs
1133 	 */
1134 	if (skip_ioapic_setup) {
1135 		printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1136 		       "due to 'noapic' option.\n");
1137 		return -ENODEV;
1138 	}
1139 
1140 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1141 				      MAX_IO_APICS);
1142 	if (!count) {
1143 		printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1144 		return -ENODEV;
1145 	} else if (count < 0) {
1146 		printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1147 		return count;
1148 	}
1149 
1150 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1151 				      acpi_parse_int_src_ovr, nr_irqs);
1152 	if (count < 0) {
1153 		printk(KERN_ERR PREFIX
1154 		       "Error parsing interrupt source overrides entry\n");
1155 		/* TBD: Cleanup to allow fallback to MPS */
1156 		return count;
1157 	}
1158 
1159 	/*
1160 	 * If BIOS did not supply an INT_SRC_OVR for the SCI
1161 	 * pretend we got one so we can set the SCI flags.
1162 	 */
1163 	if (!acpi_sci_override_gsi)
1164 		acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1165 				      acpi_gbl_FADT.sci_interrupt);
1166 
1167 	/* Fill in identity legacy mappings where no override */
1168 	mp_config_acpi_legacy_irqs();
1169 
1170 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1171 				      acpi_parse_nmi_src, nr_irqs);
1172 	if (count < 0) {
1173 		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1174 		/* TBD: Cleanup to allow fallback to MPS */
1175 		return count;
1176 	}
1177 
1178 	return 0;
1179 }
1180 #else
1181 static inline int acpi_parse_madt_ioapic_entries(void)
1182 {
1183 	return -1;
1184 }
1185 #endif	/* !CONFIG_X86_IO_APIC */
1186 
1187 static void __init early_acpi_process_madt(void)
1188 {
1189 #ifdef CONFIG_X86_LOCAL_APIC
1190 	int error;
1191 
1192 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1193 
1194 		/*
1195 		 * Parse MADT LAPIC entries
1196 		 */
1197 		error = early_acpi_parse_madt_lapic_addr_ovr();
1198 		if (!error) {
1199 			acpi_lapic = 1;
1200 			smp_found_config = 1;
1201 		}
1202 		if (error == -EINVAL) {
1203 			/*
1204 			 * Dell Precision Workstation 410, 610 come here.
1205 			 */
1206 			printk(KERN_ERR PREFIX
1207 			       "Invalid BIOS MADT, disabling ACPI\n");
1208 			disable_acpi();
1209 		}
1210 	}
1211 #endif
1212 }
1213 
1214 static void __init acpi_process_madt(void)
1215 {
1216 #ifdef CONFIG_X86_LOCAL_APIC
1217 	int error;
1218 
1219 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1220 
1221 		/*
1222 		 * Parse MADT LAPIC entries
1223 		 */
1224 		error = acpi_parse_madt_lapic_entries();
1225 		if (!error) {
1226 			acpi_lapic = 1;
1227 
1228 			/*
1229 			 * Parse MADT IO-APIC entries
1230 			 */
1231 			mutex_lock(&acpi_ioapic_lock);
1232 			error = acpi_parse_madt_ioapic_entries();
1233 			mutex_unlock(&acpi_ioapic_lock);
1234 			if (!error) {
1235 				acpi_set_irq_model_ioapic();
1236 
1237 				smp_found_config = 1;
1238 			}
1239 		}
1240 		if (error == -EINVAL) {
1241 			/*
1242 			 * Dell Precision Workstation 410, 610 come here.
1243 			 */
1244 			printk(KERN_ERR PREFIX
1245 			       "Invalid BIOS MADT, disabling ACPI\n");
1246 			disable_acpi();
1247 		}
1248 	} else {
1249 		/*
1250  		 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1251  		 * In the event an MPS table was found, forget it.
1252  		 * Boot with "acpi=off" to use MPS on such a system.
1253  		 */
1254 		if (smp_found_config) {
1255 			printk(KERN_WARNING PREFIX
1256 				"No APIC-table, disabling MPS\n");
1257 			smp_found_config = 0;
1258 		}
1259 	}
1260 
1261 	/*
1262 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1263 	 * processors, where MPS only supports physical.
1264 	 */
1265 	if (acpi_lapic && acpi_ioapic)
1266 		printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1267 		       "information\n");
1268 	else if (acpi_lapic)
1269 		printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1270 		       "configuration information\n");
1271 #endif
1272 	return;
1273 }
1274 
1275 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1276 {
1277 	if (!acpi_force) {
1278 		printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1279 		       d->ident);
1280 		acpi_noirq_set();
1281 	}
1282 	return 0;
1283 }
1284 
1285 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1286 {
1287 	if (!acpi_force) {
1288 		printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1289 		       d->ident);
1290 		acpi_disable_pci();
1291 	}
1292 	return 0;
1293 }
1294 
1295 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1296 {
1297 	if (!acpi_force) {
1298 		printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1299 		disable_acpi();
1300 	} else {
1301 		printk(KERN_NOTICE
1302 		       "Warning: DMI blacklist says broken, but acpi forced\n");
1303 	}
1304 	return 0;
1305 }
1306 
1307 /*
1308  * Force ignoring BIOS IRQ0 override
1309  */
1310 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1311 {
1312 	if (!acpi_skip_timer_override) {
1313 		pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1314 			d->ident);
1315 		acpi_skip_timer_override = 1;
1316 	}
1317 	return 0;
1318 }
1319 
1320 /*
1321  * ACPI offers an alternative platform interface model that removes
1322  * ACPI hardware requirements for platforms that do not implement
1323  * the PC Architecture.
1324  *
1325  * We initialize the Hardware-reduced ACPI model here:
1326  */
1327 static void __init acpi_reduced_hw_init(void)
1328 {
1329 	if (acpi_gbl_reduced_hardware) {
1330 		/*
1331 		 * Override x86_init functions and bypass legacy pic
1332 		 * in Hardware-reduced ACPI mode
1333 		 */
1334 		x86_init.timers.timer_init	= x86_init_noop;
1335 		x86_init.irqs.pre_vector_init	= x86_init_noop;
1336 		legacy_pic			= &null_legacy_pic;
1337 	}
1338 }
1339 
1340 /*
1341  * If your system is blacklisted here, but you find that acpi=force
1342  * works for you, please contact linux-acpi@vger.kernel.org
1343  */
1344 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1345 	/*
1346 	 * Boxes that need ACPI disabled
1347 	 */
1348 	{
1349 	 .callback = dmi_disable_acpi,
1350 	 .ident = "IBM Thinkpad",
1351 	 .matches = {
1352 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1353 		     DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1354 		     },
1355 	 },
1356 
1357 	/*
1358 	 * Boxes that need ACPI PCI IRQ routing disabled
1359 	 */
1360 	{
1361 	 .callback = disable_acpi_irq,
1362 	 .ident = "ASUS A7V",
1363 	 .matches = {
1364 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1365 		     DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1366 		     /* newer BIOS, Revision 1011, does work */
1367 		     DMI_MATCH(DMI_BIOS_VERSION,
1368 			       "ASUS A7V ACPI BIOS Revision 1007"),
1369 		     },
1370 	 },
1371 	{
1372 		/*
1373 		 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1374 		 * for LPC bridge, which is needed for the PCI
1375 		 * interrupt links to work. DSDT fix is in bug 5966.
1376 		 * 2645, 2646 model numbers are shared with 600/600E/600X
1377 		 */
1378 	 .callback = disable_acpi_irq,
1379 	 .ident = "IBM Thinkpad 600 Series 2645",
1380 	 .matches = {
1381 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1382 		     DMI_MATCH(DMI_BOARD_NAME, "2645"),
1383 		     },
1384 	 },
1385 	{
1386 	 .callback = disable_acpi_irq,
1387 	 .ident = "IBM Thinkpad 600 Series 2646",
1388 	 .matches = {
1389 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1390 		     DMI_MATCH(DMI_BOARD_NAME, "2646"),
1391 		     },
1392 	 },
1393 	/*
1394 	 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1395 	 */
1396 	{			/* _BBN 0 bug */
1397 	 .callback = disable_acpi_pci,
1398 	 .ident = "ASUS PR-DLS",
1399 	 .matches = {
1400 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1401 		     DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1402 		     DMI_MATCH(DMI_BIOS_VERSION,
1403 			       "ASUS PR-DLS ACPI BIOS Revision 1010"),
1404 		     DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1405 		     },
1406 	 },
1407 	{
1408 	 .callback = disable_acpi_pci,
1409 	 .ident = "Acer TravelMate 36x Laptop",
1410 	 .matches = {
1411 		     DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1412 		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1413 		     },
1414 	 },
1415 	{}
1416 };
1417 
1418 /* second table for DMI checks that should run after early-quirks */
1419 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1420 	/*
1421 	 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1422 	 * which includes some code which overrides all temperature
1423 	 * trip points to 16C if the INTIN2 input of the I/O APIC
1424 	 * is enabled.  This input is incorrectly designated the
1425 	 * ISA IRQ 0 via an interrupt source override even though
1426 	 * it is wired to the output of the master 8259A and INTIN0
1427 	 * is not connected at all.  Force ignoring BIOS IRQ0
1428 	 * override in that cases.
1429 	 */
1430 	{
1431 	 .callback = dmi_ignore_irq0_timer_override,
1432 	 .ident = "HP nx6115 laptop",
1433 	 .matches = {
1434 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1435 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1436 		     },
1437 	 },
1438 	{
1439 	 .callback = dmi_ignore_irq0_timer_override,
1440 	 .ident = "HP NX6125 laptop",
1441 	 .matches = {
1442 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1443 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1444 		     },
1445 	 },
1446 	{
1447 	 .callback = dmi_ignore_irq0_timer_override,
1448 	 .ident = "HP NX6325 laptop",
1449 	 .matches = {
1450 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1451 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1452 		     },
1453 	 },
1454 	{
1455 	 .callback = dmi_ignore_irq0_timer_override,
1456 	 .ident = "HP 6715b laptop",
1457 	 .matches = {
1458 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1459 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1460 		     },
1461 	 },
1462 	{
1463 	 .callback = dmi_ignore_irq0_timer_override,
1464 	 .ident = "FUJITSU SIEMENS",
1465 	 .matches = {
1466 		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1467 		     DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1468 		     },
1469 	 },
1470 	{}
1471 };
1472 
1473 /*
1474  * acpi_boot_table_init() and acpi_boot_init()
1475  *  called from setup_arch(), always.
1476  *	1. checksums all tables
1477  *	2. enumerates lapics
1478  *	3. enumerates io-apics
1479  *
1480  * acpi_table_init() is separate to allow reading SRAT without
1481  * other side effects.
1482  *
1483  * side effects of acpi_boot_init:
1484  *	acpi_lapic = 1 if LAPIC found
1485  *	acpi_ioapic = 1 if IOAPIC found
1486  *	if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1487  *	if acpi_blacklisted() acpi_disabled = 1;
1488  *	acpi_irq_model=...
1489  *	...
1490  */
1491 
1492 void __init acpi_boot_table_init(void)
1493 {
1494 	dmi_check_system(acpi_dmi_table);
1495 
1496 	/*
1497 	 * If acpi_disabled, bail out
1498 	 */
1499 	if (acpi_disabled)
1500 		return;
1501 
1502 	/*
1503 	 * Initialize the ACPI boot-time table parser.
1504 	 */
1505 	if (acpi_table_init()) {
1506 		disable_acpi();
1507 		return;
1508 	}
1509 
1510 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1511 
1512 	/*
1513 	 * blacklist may disable ACPI entirely
1514 	 */
1515 	if (acpi_blacklisted()) {
1516 		if (acpi_force) {
1517 			printk(KERN_WARNING PREFIX "acpi=force override\n");
1518 		} else {
1519 			printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1520 			disable_acpi();
1521 			return;
1522 		}
1523 	}
1524 }
1525 
1526 int __init early_acpi_boot_init(void)
1527 {
1528 	/*
1529 	 * If acpi_disabled, bail out
1530 	 */
1531 	if (acpi_disabled)
1532 		return 1;
1533 
1534 	/*
1535 	 * Process the Multiple APIC Description Table (MADT), if present
1536 	 */
1537 	early_acpi_process_madt();
1538 
1539 	/*
1540 	 * Hardware-reduced ACPI mode initialization:
1541 	 */
1542 	acpi_reduced_hw_init();
1543 
1544 	return 0;
1545 }
1546 
1547 int __init acpi_boot_init(void)
1548 {
1549 	/* those are executed after early-quirks are executed */
1550 	dmi_check_system(acpi_dmi_table_late);
1551 
1552 	/*
1553 	 * If acpi_disabled, bail out
1554 	 */
1555 	if (acpi_disabled)
1556 		return 1;
1557 
1558 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1559 
1560 	/*
1561 	 * set sci_int and PM timer address
1562 	 */
1563 	acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1564 
1565 	/*
1566 	 * Process the Multiple APIC Description Table (MADT), if present
1567 	 */
1568 	acpi_process_madt();
1569 
1570 	acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1571 
1572 	if (!acpi_noirq)
1573 		x86_init.pci.init = pci_acpi_init;
1574 
1575 	return 0;
1576 }
1577 
1578 static int __init parse_acpi(char *arg)
1579 {
1580 	if (!arg)
1581 		return -EINVAL;
1582 
1583 	/* "acpi=off" disables both ACPI table parsing and interpreter */
1584 	if (strcmp(arg, "off") == 0) {
1585 		disable_acpi();
1586 	}
1587 	/* acpi=force to over-ride black-list */
1588 	else if (strcmp(arg, "force") == 0) {
1589 		acpi_force = 1;
1590 		acpi_disabled = 0;
1591 	}
1592 	/* acpi=strict disables out-of-spec workarounds */
1593 	else if (strcmp(arg, "strict") == 0) {
1594 		acpi_strict = 1;
1595 	}
1596 	/* acpi=rsdt use RSDT instead of XSDT */
1597 	else if (strcmp(arg, "rsdt") == 0) {
1598 		acpi_gbl_do_not_use_xsdt = TRUE;
1599 	}
1600 	/* "acpi=noirq" disables ACPI interrupt routing */
1601 	else if (strcmp(arg, "noirq") == 0) {
1602 		acpi_noirq_set();
1603 	}
1604 	/* "acpi=copy_dsdt" copys DSDT */
1605 	else if (strcmp(arg, "copy_dsdt") == 0) {
1606 		acpi_gbl_copy_dsdt_locally = 1;
1607 	}
1608 	/* "acpi=nocmcff" disables FF mode for corrected errors */
1609 	else if (strcmp(arg, "nocmcff") == 0) {
1610 		acpi_disable_cmcff = 1;
1611 	} else {
1612 		/* Core will printk when we return error. */
1613 		return -EINVAL;
1614 	}
1615 	return 0;
1616 }
1617 early_param("acpi", parse_acpi);
1618 
1619 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1620 static int __init parse_pci(char *arg)
1621 {
1622 	if (arg && strcmp(arg, "noacpi") == 0)
1623 		acpi_disable_pci();
1624 	return 0;
1625 }
1626 early_param("pci", parse_pci);
1627 
1628 int __init acpi_mps_check(void)
1629 {
1630 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1631 /* mptable code is not built-in*/
1632 	if (acpi_disabled || acpi_noirq) {
1633 		printk(KERN_WARNING "MPS support code is not built-in.\n"
1634 		       "Using acpi=off or acpi=noirq or pci=noacpi "
1635 		       "may have problem\n");
1636 		return 1;
1637 	}
1638 #endif
1639 	return 0;
1640 }
1641 
1642 #ifdef CONFIG_X86_IO_APIC
1643 static int __init parse_acpi_skip_timer_override(char *arg)
1644 {
1645 	acpi_skip_timer_override = 1;
1646 	return 0;
1647 }
1648 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1649 
1650 static int __init parse_acpi_use_timer_override(char *arg)
1651 {
1652 	acpi_use_timer_override = 1;
1653 	return 0;
1654 }
1655 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1656 #endif /* CONFIG_X86_IO_APIC */
1657 
1658 static int __init setup_acpi_sci(char *s)
1659 {
1660 	if (!s)
1661 		return -EINVAL;
1662 	if (!strcmp(s, "edge"))
1663 		acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1664 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1665 	else if (!strcmp(s, "level"))
1666 		acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1667 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1668 	else if (!strcmp(s, "high"))
1669 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1670 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1671 	else if (!strcmp(s, "low"))
1672 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1673 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1674 	else
1675 		return -EINVAL;
1676 	return 0;
1677 }
1678 early_param("acpi_sci", setup_acpi_sci);
1679 
1680 int __acpi_acquire_global_lock(unsigned int *lock)
1681 {
1682 	unsigned int old, new, val;
1683 	do {
1684 		old = *lock;
1685 		new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1686 		val = cmpxchg(lock, old, new);
1687 	} while (unlikely (val != old));
1688 	return (new < 3) ? -1 : 0;
1689 }
1690 
1691 int __acpi_release_global_lock(unsigned int *lock)
1692 {
1693 	unsigned int old, new, val;
1694 	do {
1695 		old = *lock;
1696 		new = old & ~0x3;
1697 		val = cmpxchg(lock, old, new);
1698 	} while (unlikely (val != old));
1699 	return old & 0x1;
1700 }
1701 
1702 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1703 {
1704 	e820_add_region(addr, size, E820_ACPI);
1705 	update_e820();
1706 }
1707