xref: /linux/arch/x86/kernel/acpi/boot.c (revision 2bc46b3ad3c15165f91459b07ff8682478683194)
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 (!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  * @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 
449 	/*
450 	 * stash over-ride to indicate we've been here
451 	 * and for later update of acpi_gbl_FADT
452 	 */
453 	acpi_sci_override_gsi = gsi;
454 	return;
455 }
456 
457 static int __init
458 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
459 		       const unsigned long end)
460 {
461 	struct acpi_madt_interrupt_override *intsrc = NULL;
462 
463 	intsrc = (struct acpi_madt_interrupt_override *)header;
464 
465 	if (BAD_MADT_ENTRY(intsrc, end))
466 		return -EINVAL;
467 
468 	acpi_table_print_madt_entry(header);
469 
470 	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
471 		acpi_sci_ioapic_setup(intsrc->source_irq,
472 				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
473 				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
474 				      intsrc->global_irq);
475 		return 0;
476 	}
477 
478 	if (intsrc->source_irq == 0) {
479 		if (acpi_skip_timer_override) {
480 			printk(PREFIX "BIOS IRQ0 override ignored.\n");
481 			return 0;
482 		}
483 
484 		if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
485 			&& (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
486 			intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
487 			printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
488 		}
489 	}
490 
491 	mp_override_legacy_irq(intsrc->source_irq,
492 				intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
493 				(intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
494 				intsrc->global_irq);
495 
496 	return 0;
497 }
498 
499 static int __init
500 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
501 {
502 	struct acpi_madt_nmi_source *nmi_src = NULL;
503 
504 	nmi_src = (struct acpi_madt_nmi_source *)header;
505 
506 	if (BAD_MADT_ENTRY(nmi_src, end))
507 		return -EINVAL;
508 
509 	acpi_table_print_madt_entry(header);
510 
511 	/* TBD: Support nimsrc entries? */
512 
513 	return 0;
514 }
515 
516 #endif				/* CONFIG_X86_IO_APIC */
517 
518 /*
519  * acpi_pic_sci_set_trigger()
520  *
521  * use ELCR to set PIC-mode trigger type for SCI
522  *
523  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
524  * it may require Edge Trigger -- use "acpi_sci=edge"
525  *
526  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
527  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
528  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
529  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
530  */
531 
532 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
533 {
534 	unsigned int mask = 1 << irq;
535 	unsigned int old, new;
536 
537 	/* Real old ELCR mask */
538 	old = inb(0x4d0) | (inb(0x4d1) << 8);
539 
540 	/*
541 	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
542 	 * since we will set it correctly as we enable the PCI irq
543 	 * routing.
544 	 */
545 	new = acpi_noirq ? old : 0;
546 
547 	/*
548 	 * Update SCI information in the ELCR, it isn't in the PCI
549 	 * routing tables..
550 	 */
551 	switch (trigger) {
552 	case 1:		/* Edge - clear */
553 		new &= ~mask;
554 		break;
555 	case 3:		/* Level - set */
556 		new |= mask;
557 		break;
558 	}
559 
560 	if (old == new)
561 		return;
562 
563 	printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
564 	outb(new, 0x4d0);
565 	outb(new >> 8, 0x4d1);
566 }
567 
568 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
569 {
570 	int rc, irq, trigger, polarity;
571 
572 	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
573 		*irqp = gsi;
574 		return 0;
575 	}
576 
577 	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
578 	if (rc == 0) {
579 		trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
580 		polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
581 		irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
582 		if (irq >= 0) {
583 			*irqp = irq;
584 			return 0;
585 		}
586 	}
587 
588 	return -1;
589 }
590 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
591 
592 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
593 {
594 	if (isa_irq < nr_legacy_irqs() &&
595 	    isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
596 		*gsi = isa_irq_to_gsi[isa_irq];
597 		return 0;
598 	}
599 
600 	return -1;
601 }
602 
603 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
604 				 int trigger, int polarity)
605 {
606 #ifdef CONFIG_PCI
607 	/*
608 	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
609 	 */
610 	if (trigger == ACPI_LEVEL_SENSITIVE)
611 		elcr_set_level_irq(gsi);
612 #endif
613 
614 	return gsi;
615 }
616 
617 #ifdef CONFIG_X86_LOCAL_APIC
618 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
619 				    int trigger, int polarity)
620 {
621 	int irq = gsi;
622 #ifdef CONFIG_X86_IO_APIC
623 	int node;
624 	struct irq_alloc_info info;
625 
626 	node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
627 	trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
628 	polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
629 	ioapic_set_alloc_attr(&info, node, trigger, polarity);
630 
631 	mutex_lock(&acpi_ioapic_lock);
632 	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
633 	/* Don't set up the ACPI SCI because it's already set up */
634 	if (irq >= 0 && enable_update_mptable &&
635 	    acpi_gbl_FADT.sci_interrupt != gsi)
636 		mp_config_acpi_gsi(dev, gsi, trigger, polarity);
637 	mutex_unlock(&acpi_ioapic_lock);
638 #endif
639 
640 	return irq;
641 }
642 
643 static void acpi_unregister_gsi_ioapic(u32 gsi)
644 {
645 #ifdef CONFIG_X86_IO_APIC
646 	int irq;
647 
648 	mutex_lock(&acpi_ioapic_lock);
649 	irq = mp_map_gsi_to_irq(gsi, 0, NULL);
650 	if (irq > 0)
651 		mp_unmap_irq(irq);
652 	mutex_unlock(&acpi_ioapic_lock);
653 #endif
654 }
655 #endif
656 
657 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
658 			   int trigger, int polarity) = acpi_register_gsi_pic;
659 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
660 
661 #ifdef CONFIG_ACPI_SLEEP
662 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
663 #else
664 int (*acpi_suspend_lowlevel)(void);
665 #endif
666 
667 /*
668  * success: return IRQ number (>=0)
669  * failure: return < 0
670  */
671 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
672 {
673 	return __acpi_register_gsi(dev, gsi, trigger, polarity);
674 }
675 EXPORT_SYMBOL_GPL(acpi_register_gsi);
676 
677 void acpi_unregister_gsi(u32 gsi)
678 {
679 	if (__acpi_unregister_gsi)
680 		__acpi_unregister_gsi(gsi);
681 }
682 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
683 
684 #ifdef CONFIG_X86_LOCAL_APIC
685 static void __init acpi_set_irq_model_ioapic(void)
686 {
687 	acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
688 	__acpi_register_gsi = acpi_register_gsi_ioapic;
689 	__acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
690 	acpi_ioapic = 1;
691 }
692 #endif
693 
694 /*
695  *  ACPI based hotplug support for CPU
696  */
697 #ifdef CONFIG_ACPI_HOTPLUG_CPU
698 #include <acpi/processor.h>
699 
700 static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
701 {
702 #ifdef CONFIG_ACPI_NUMA
703 	int nid;
704 
705 	nid = acpi_get_node(handle);
706 	if (nid != -1) {
707 		set_apicid_to_node(physid, nid);
708 		numa_set_node(cpu, nid);
709 	}
710 #endif
711 }
712 
713 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
714 {
715 	int cpu;
716 
717 	cpu = acpi_register_lapic(physid, ACPI_MADT_ENABLED);
718 	if (cpu < 0) {
719 		pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
720 		return cpu;
721 	}
722 
723 	acpi_processor_set_pdc(handle);
724 	acpi_map_cpu2node(handle, cpu, physid);
725 
726 	*pcpu = cpu;
727 	return 0;
728 }
729 EXPORT_SYMBOL(acpi_map_cpu);
730 
731 int acpi_unmap_cpu(int cpu)
732 {
733 #ifdef CONFIG_ACPI_NUMA
734 	set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
735 #endif
736 
737 	per_cpu(x86_cpu_to_apicid, cpu) = -1;
738 	set_cpu_present(cpu, false);
739 	num_processors--;
740 
741 	return (0);
742 }
743 EXPORT_SYMBOL(acpi_unmap_cpu);
744 #endif				/* CONFIG_ACPI_HOTPLUG_CPU */
745 
746 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
747 {
748 	int ret = -ENOSYS;
749 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
750 	int ioapic_id;
751 	u64 addr;
752 	struct ioapic_domain_cfg cfg = {
753 		.type = IOAPIC_DOMAIN_DYNAMIC,
754 		.ops = &mp_ioapic_irqdomain_ops,
755 	};
756 
757 	ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
758 	if (ioapic_id < 0) {
759 		unsigned long long uid;
760 		acpi_status status;
761 
762 		status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
763 					       NULL, &uid);
764 		if (ACPI_FAILURE(status)) {
765 			acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
766 			return -EINVAL;
767 		}
768 		ioapic_id = (int)uid;
769 	}
770 
771 	mutex_lock(&acpi_ioapic_lock);
772 	ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
773 	mutex_unlock(&acpi_ioapic_lock);
774 #endif
775 
776 	return ret;
777 }
778 EXPORT_SYMBOL(acpi_register_ioapic);
779 
780 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
781 {
782 	int ret = -ENOSYS;
783 
784 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
785 	mutex_lock(&acpi_ioapic_lock);
786 	ret  = mp_unregister_ioapic(gsi_base);
787 	mutex_unlock(&acpi_ioapic_lock);
788 #endif
789 
790 	return ret;
791 }
792 EXPORT_SYMBOL(acpi_unregister_ioapic);
793 
794 /**
795  * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
796  *			    has been registered
797  * @handle:	ACPI handle of the IOAPIC deivce
798  * @gsi_base:	GSI base associated with the IOAPIC
799  *
800  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
801  * with acpi_register_ioapic()/acpi_unregister_ioapic().
802  */
803 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
804 {
805 	int ret = 0;
806 
807 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
808 	mutex_lock(&acpi_ioapic_lock);
809 	ret  = mp_ioapic_registered(gsi_base);
810 	mutex_unlock(&acpi_ioapic_lock);
811 #endif
812 
813 	return ret;
814 }
815 
816 static int __init acpi_parse_sbf(struct acpi_table_header *table)
817 {
818 	struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
819 
820 	sbf_port = sb->cmos_index;	/* Save CMOS port */
821 
822 	return 0;
823 }
824 
825 #ifdef CONFIG_HPET_TIMER
826 #include <asm/hpet.h>
827 
828 static struct resource *hpet_res __initdata;
829 
830 static int __init acpi_parse_hpet(struct acpi_table_header *table)
831 {
832 	struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
833 
834 	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
835 		printk(KERN_WARNING PREFIX "HPET timers must be located in "
836 		       "memory.\n");
837 		return -1;
838 	}
839 
840 	hpet_address = hpet_tbl->address.address;
841 	hpet_blockid = hpet_tbl->sequence;
842 
843 	/*
844 	 * Some broken BIOSes advertise HPET at 0x0. We really do not
845 	 * want to allocate a resource there.
846 	 */
847 	if (!hpet_address) {
848 		printk(KERN_WARNING PREFIX
849 		       "HPET id: %#x base: %#lx is invalid\n",
850 		       hpet_tbl->id, hpet_address);
851 		return 0;
852 	}
853 #ifdef CONFIG_X86_64
854 	/*
855 	 * Some even more broken BIOSes advertise HPET at
856 	 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
857 	 * some noise:
858 	 */
859 	if (hpet_address == 0xfed0000000000000UL) {
860 		if (!hpet_force_user) {
861 			printk(KERN_WARNING PREFIX "HPET id: %#x "
862 			       "base: 0xfed0000000000000 is bogus\n "
863 			       "try hpet=force on the kernel command line to "
864 			       "fix it up to 0xfed00000.\n", hpet_tbl->id);
865 			hpet_address = 0;
866 			return 0;
867 		}
868 		printk(KERN_WARNING PREFIX
869 		       "HPET id: %#x base: 0xfed0000000000000 fixed up "
870 		       "to 0xfed00000.\n", hpet_tbl->id);
871 		hpet_address >>= 32;
872 	}
873 #endif
874 	printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
875 	       hpet_tbl->id, hpet_address);
876 
877 	/*
878 	 * Allocate and initialize the HPET firmware resource for adding into
879 	 * the resource tree during the lateinit timeframe.
880 	 */
881 #define HPET_RESOURCE_NAME_SIZE 9
882 	hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
883 
884 	hpet_res->name = (void *)&hpet_res[1];
885 	hpet_res->flags = IORESOURCE_MEM;
886 	snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
887 		 hpet_tbl->sequence);
888 
889 	hpet_res->start = hpet_address;
890 	hpet_res->end = hpet_address + (1 * 1024) - 1;
891 
892 	return 0;
893 }
894 
895 /*
896  * hpet_insert_resource inserts the HPET resources used into the resource
897  * tree.
898  */
899 static __init int hpet_insert_resource(void)
900 {
901 	if (!hpet_res)
902 		return 1;
903 
904 	return insert_resource(&iomem_resource, hpet_res);
905 }
906 
907 late_initcall(hpet_insert_resource);
908 
909 #else
910 #define	acpi_parse_hpet	NULL
911 #endif
912 
913 static int __init acpi_parse_fadt(struct acpi_table_header *table)
914 {
915 	if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
916 		pr_debug("ACPI: no legacy devices present\n");
917 		x86_platform.legacy.devices.pnpbios = 0;
918 	}
919 
920 	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
921 		pr_debug("ACPI: not registering RTC platform device\n");
922 		x86_platform.legacy.rtc = 0;
923 	}
924 
925 #ifdef CONFIG_X86_PM_TIMER
926 	/* detect the location of the ACPI PM Timer */
927 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
928 		/* FADT rev. 2 */
929 		if (acpi_gbl_FADT.xpm_timer_block.space_id !=
930 		    ACPI_ADR_SPACE_SYSTEM_IO)
931 			return 0;
932 
933 		pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
934 		/*
935 		 * "X" fields are optional extensions to the original V1.0
936 		 * fields, so we must selectively expand V1.0 fields if the
937 		 * corresponding X field is zero.
938 	 	 */
939 		if (!pmtmr_ioport)
940 			pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
941 	} else {
942 		/* FADT rev. 1 */
943 		pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
944 	}
945 	if (pmtmr_ioport)
946 		printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
947 		       pmtmr_ioport);
948 #endif
949 	return 0;
950 }
951 
952 #ifdef	CONFIG_X86_LOCAL_APIC
953 /*
954  * Parse LAPIC entries in MADT
955  * returns 0 on success, < 0 on error
956  */
957 
958 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
959 {
960 	int count;
961 
962 	if (!boot_cpu_has(X86_FEATURE_APIC))
963 		return -ENODEV;
964 
965 	/*
966 	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
967 	 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
968 	 */
969 
970 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
971 				      acpi_parse_lapic_addr_ovr, 0);
972 	if (count < 0) {
973 		printk(KERN_ERR PREFIX
974 		       "Error parsing LAPIC address override entry\n");
975 		return count;
976 	}
977 
978 	register_lapic_address(acpi_lapic_addr);
979 
980 	return count;
981 }
982 
983 static int __init acpi_parse_madt_lapic_entries(void)
984 {
985 	int count;
986 	int x2count = 0;
987 	int ret;
988 	struct acpi_subtable_proc madt_proc[2];
989 
990 	if (!boot_cpu_has(X86_FEATURE_APIC))
991 		return -ENODEV;
992 
993 	/*
994 	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
995 	 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
996 	 */
997 
998 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
999 				      acpi_parse_lapic_addr_ovr, 0);
1000 	if (count < 0) {
1001 		printk(KERN_ERR PREFIX
1002 		       "Error parsing LAPIC address override entry\n");
1003 		return count;
1004 	}
1005 
1006 	register_lapic_address(acpi_lapic_addr);
1007 
1008 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1009 				      acpi_parse_sapic, MAX_LOCAL_APIC);
1010 
1011 	if (!count) {
1012 		memset(madt_proc, 0, sizeof(madt_proc));
1013 		madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1014 		madt_proc[0].handler = acpi_parse_lapic;
1015 		madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1016 		madt_proc[1].handler = acpi_parse_x2apic;
1017 		ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1018 				sizeof(struct acpi_table_madt),
1019 				madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1020 		if (ret < 0) {
1021 			printk(KERN_ERR PREFIX
1022 					"Error parsing LAPIC/X2APIC entries\n");
1023 			return ret;
1024 		}
1025 
1026 		x2count = madt_proc[0].count;
1027 		count = madt_proc[1].count;
1028 	}
1029 	if (!count && !x2count) {
1030 		printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1031 		/* TBD: Cleanup to allow fallback to MPS */
1032 		return -ENODEV;
1033 	} else if (count < 0 || x2count < 0) {
1034 		printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1035 		/* TBD: Cleanup to allow fallback to MPS */
1036 		return count;
1037 	}
1038 
1039 	x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1040 					acpi_parse_x2apic_nmi, 0);
1041 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1042 				      acpi_parse_lapic_nmi, 0);
1043 	if (count < 0 || x2count < 0) {
1044 		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1045 		/* TBD: Cleanup to allow fallback to MPS */
1046 		return count;
1047 	}
1048 	return 0;
1049 }
1050 #endif				/* CONFIG_X86_LOCAL_APIC */
1051 
1052 #ifdef	CONFIG_X86_IO_APIC
1053 static void __init mp_config_acpi_legacy_irqs(void)
1054 {
1055 	int i;
1056 	struct mpc_intsrc mp_irq;
1057 
1058 #ifdef CONFIG_EISA
1059 	/*
1060 	 * Fabricate the legacy ISA bus (bus #31).
1061 	 */
1062 	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1063 #endif
1064 	set_bit(MP_ISA_BUS, mp_bus_not_pci);
1065 	pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1066 
1067 	/*
1068 	 * Use the default configuration for the IRQs 0-15.  Unless
1069 	 * overridden by (MADT) interrupt source override entries.
1070 	 */
1071 	for (i = 0; i < nr_legacy_irqs(); i++) {
1072 		int ioapic, pin;
1073 		unsigned int dstapic;
1074 		int idx;
1075 		u32 gsi;
1076 
1077 		/* Locate the gsi that irq i maps to. */
1078 		if (acpi_isa_irq_to_gsi(i, &gsi))
1079 			continue;
1080 
1081 		/*
1082 		 * Locate the IOAPIC that manages the ISA IRQ.
1083 		 */
1084 		ioapic = mp_find_ioapic(gsi);
1085 		if (ioapic < 0)
1086 			continue;
1087 		pin = mp_find_ioapic_pin(ioapic, gsi);
1088 		dstapic = mpc_ioapic_id(ioapic);
1089 
1090 		for (idx = 0; idx < mp_irq_entries; idx++) {
1091 			struct mpc_intsrc *irq = mp_irqs + idx;
1092 
1093 			/* Do we already have a mapping for this ISA IRQ? */
1094 			if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1095 				break;
1096 
1097 			/* Do we already have a mapping for this IOAPIC pin */
1098 			if (irq->dstapic == dstapic && irq->dstirq == pin)
1099 				break;
1100 		}
1101 
1102 		if (idx != mp_irq_entries) {
1103 			printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1104 			continue;	/* IRQ already used */
1105 		}
1106 
1107 		mp_irq.type = MP_INTSRC;
1108 		mp_irq.irqflag = 0;	/* Conforming */
1109 		mp_irq.srcbus = MP_ISA_BUS;
1110 		mp_irq.dstapic = dstapic;
1111 		mp_irq.irqtype = mp_INT;
1112 		mp_irq.srcbusirq = i; /* Identity mapped */
1113 		mp_irq.dstirq = pin;
1114 
1115 		mp_save_irq(&mp_irq);
1116 	}
1117 }
1118 
1119 /*
1120  * Parse IOAPIC related entries in MADT
1121  * returns 0 on success, < 0 on error
1122  */
1123 static int __init acpi_parse_madt_ioapic_entries(void)
1124 {
1125 	int count;
1126 
1127 	/*
1128 	 * ACPI interpreter is required to complete interrupt setup,
1129 	 * so if it is off, don't enumerate the io-apics with ACPI.
1130 	 * If MPS is present, it will handle them,
1131 	 * otherwise the system will stay in PIC mode
1132 	 */
1133 	if (acpi_disabled || acpi_noirq)
1134 		return -ENODEV;
1135 
1136 	if (!boot_cpu_has(X86_FEATURE_APIC))
1137 		return -ENODEV;
1138 
1139 	/*
1140 	 * if "noapic" boot option, don't look for IO-APICs
1141 	 */
1142 	if (skip_ioapic_setup) {
1143 		printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1144 		       "due to 'noapic' option.\n");
1145 		return -ENODEV;
1146 	}
1147 
1148 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1149 				      MAX_IO_APICS);
1150 	if (!count) {
1151 		printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1152 		return -ENODEV;
1153 	} else if (count < 0) {
1154 		printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1155 		return count;
1156 	}
1157 
1158 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1159 				      acpi_parse_int_src_ovr, nr_irqs);
1160 	if (count < 0) {
1161 		printk(KERN_ERR PREFIX
1162 		       "Error parsing interrupt source overrides entry\n");
1163 		/* TBD: Cleanup to allow fallback to MPS */
1164 		return count;
1165 	}
1166 
1167 	/*
1168 	 * If BIOS did not supply an INT_SRC_OVR for the SCI
1169 	 * pretend we got one so we can set the SCI flags.
1170 	 */
1171 	if (!acpi_sci_override_gsi)
1172 		acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1173 				      acpi_gbl_FADT.sci_interrupt);
1174 
1175 	/* Fill in identity legacy mappings where no override */
1176 	mp_config_acpi_legacy_irqs();
1177 
1178 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1179 				      acpi_parse_nmi_src, nr_irqs);
1180 	if (count < 0) {
1181 		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1182 		/* TBD: Cleanup to allow fallback to MPS */
1183 		return count;
1184 	}
1185 
1186 	return 0;
1187 }
1188 #else
1189 static inline int acpi_parse_madt_ioapic_entries(void)
1190 {
1191 	return -1;
1192 }
1193 #endif	/* !CONFIG_X86_IO_APIC */
1194 
1195 static void __init early_acpi_process_madt(void)
1196 {
1197 #ifdef CONFIG_X86_LOCAL_APIC
1198 	int error;
1199 
1200 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1201 
1202 		/*
1203 		 * Parse MADT LAPIC entries
1204 		 */
1205 		error = early_acpi_parse_madt_lapic_addr_ovr();
1206 		if (!error) {
1207 			acpi_lapic = 1;
1208 			smp_found_config = 1;
1209 		}
1210 		if (error == -EINVAL) {
1211 			/*
1212 			 * Dell Precision Workstation 410, 610 come here.
1213 			 */
1214 			printk(KERN_ERR PREFIX
1215 			       "Invalid BIOS MADT, disabling ACPI\n");
1216 			disable_acpi();
1217 		}
1218 	}
1219 #endif
1220 }
1221 
1222 static void __init acpi_process_madt(void)
1223 {
1224 #ifdef CONFIG_X86_LOCAL_APIC
1225 	int error;
1226 
1227 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1228 
1229 		/*
1230 		 * Parse MADT LAPIC entries
1231 		 */
1232 		error = acpi_parse_madt_lapic_entries();
1233 		if (!error) {
1234 			acpi_lapic = 1;
1235 
1236 			/*
1237 			 * Parse MADT IO-APIC entries
1238 			 */
1239 			mutex_lock(&acpi_ioapic_lock);
1240 			error = acpi_parse_madt_ioapic_entries();
1241 			mutex_unlock(&acpi_ioapic_lock);
1242 			if (!error) {
1243 				acpi_set_irq_model_ioapic();
1244 
1245 				smp_found_config = 1;
1246 			}
1247 		}
1248 		if (error == -EINVAL) {
1249 			/*
1250 			 * Dell Precision Workstation 410, 610 come here.
1251 			 */
1252 			printk(KERN_ERR PREFIX
1253 			       "Invalid BIOS MADT, disabling ACPI\n");
1254 			disable_acpi();
1255 		}
1256 	} else {
1257 		/*
1258  		 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1259  		 * In the event an MPS table was found, forget it.
1260  		 * Boot with "acpi=off" to use MPS on such a system.
1261  		 */
1262 		if (smp_found_config) {
1263 			printk(KERN_WARNING PREFIX
1264 				"No APIC-table, disabling MPS\n");
1265 			smp_found_config = 0;
1266 		}
1267 	}
1268 
1269 	/*
1270 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1271 	 * processors, where MPS only supports physical.
1272 	 */
1273 	if (acpi_lapic && acpi_ioapic)
1274 		printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1275 		       "information\n");
1276 	else if (acpi_lapic)
1277 		printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1278 		       "configuration information\n");
1279 #endif
1280 	return;
1281 }
1282 
1283 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1284 {
1285 	if (!acpi_force) {
1286 		printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1287 		       d->ident);
1288 		acpi_noirq_set();
1289 	}
1290 	return 0;
1291 }
1292 
1293 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1294 {
1295 	if (!acpi_force) {
1296 		printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1297 		       d->ident);
1298 		acpi_disable_pci();
1299 	}
1300 	return 0;
1301 }
1302 
1303 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1304 {
1305 	if (!acpi_force) {
1306 		printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1307 		disable_acpi();
1308 	} else {
1309 		printk(KERN_NOTICE
1310 		       "Warning: DMI blacklist says broken, but acpi forced\n");
1311 	}
1312 	return 0;
1313 }
1314 
1315 /*
1316  * Force ignoring BIOS IRQ0 override
1317  */
1318 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1319 {
1320 	if (!acpi_skip_timer_override) {
1321 		pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1322 			d->ident);
1323 		acpi_skip_timer_override = 1;
1324 	}
1325 	return 0;
1326 }
1327 
1328 /*
1329  * ACPI offers an alternative platform interface model that removes
1330  * ACPI hardware requirements for platforms that do not implement
1331  * the PC Architecture.
1332  *
1333  * We initialize the Hardware-reduced ACPI model here:
1334  */
1335 static void __init acpi_reduced_hw_init(void)
1336 {
1337 	if (acpi_gbl_reduced_hardware) {
1338 		/*
1339 		 * Override x86_init functions and bypass legacy pic
1340 		 * in Hardware-reduced ACPI mode
1341 		 */
1342 		x86_init.timers.timer_init	= x86_init_noop;
1343 		x86_init.irqs.pre_vector_init	= x86_init_noop;
1344 		legacy_pic			= &null_legacy_pic;
1345 	}
1346 }
1347 
1348 /*
1349  * If your system is blacklisted here, but you find that acpi=force
1350  * works for you, please contact linux-acpi@vger.kernel.org
1351  */
1352 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1353 	/*
1354 	 * Boxes that need ACPI disabled
1355 	 */
1356 	{
1357 	 .callback = dmi_disable_acpi,
1358 	 .ident = "IBM Thinkpad",
1359 	 .matches = {
1360 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1361 		     DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1362 		     },
1363 	 },
1364 
1365 	/*
1366 	 * Boxes that need ACPI PCI IRQ routing disabled
1367 	 */
1368 	{
1369 	 .callback = disable_acpi_irq,
1370 	 .ident = "ASUS A7V",
1371 	 .matches = {
1372 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1373 		     DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1374 		     /* newer BIOS, Revision 1011, does work */
1375 		     DMI_MATCH(DMI_BIOS_VERSION,
1376 			       "ASUS A7V ACPI BIOS Revision 1007"),
1377 		     },
1378 	 },
1379 	{
1380 		/*
1381 		 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1382 		 * for LPC bridge, which is needed for the PCI
1383 		 * interrupt links to work. DSDT fix is in bug 5966.
1384 		 * 2645, 2646 model numbers are shared with 600/600E/600X
1385 		 */
1386 	 .callback = disable_acpi_irq,
1387 	 .ident = "IBM Thinkpad 600 Series 2645",
1388 	 .matches = {
1389 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1390 		     DMI_MATCH(DMI_BOARD_NAME, "2645"),
1391 		     },
1392 	 },
1393 	{
1394 	 .callback = disable_acpi_irq,
1395 	 .ident = "IBM Thinkpad 600 Series 2646",
1396 	 .matches = {
1397 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1398 		     DMI_MATCH(DMI_BOARD_NAME, "2646"),
1399 		     },
1400 	 },
1401 	/*
1402 	 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1403 	 */
1404 	{			/* _BBN 0 bug */
1405 	 .callback = disable_acpi_pci,
1406 	 .ident = "ASUS PR-DLS",
1407 	 .matches = {
1408 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1409 		     DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1410 		     DMI_MATCH(DMI_BIOS_VERSION,
1411 			       "ASUS PR-DLS ACPI BIOS Revision 1010"),
1412 		     DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1413 		     },
1414 	 },
1415 	{
1416 	 .callback = disable_acpi_pci,
1417 	 .ident = "Acer TravelMate 36x Laptop",
1418 	 .matches = {
1419 		     DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1420 		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1421 		     },
1422 	 },
1423 	{}
1424 };
1425 
1426 /* second table for DMI checks that should run after early-quirks */
1427 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1428 	/*
1429 	 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1430 	 * which includes some code which overrides all temperature
1431 	 * trip points to 16C if the INTIN2 input of the I/O APIC
1432 	 * is enabled.  This input is incorrectly designated the
1433 	 * ISA IRQ 0 via an interrupt source override even though
1434 	 * it is wired to the output of the master 8259A and INTIN0
1435 	 * is not connected at all.  Force ignoring BIOS IRQ0
1436 	 * override in that cases.
1437 	 */
1438 	{
1439 	 .callback = dmi_ignore_irq0_timer_override,
1440 	 .ident = "HP nx6115 laptop",
1441 	 .matches = {
1442 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1443 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1444 		     },
1445 	 },
1446 	{
1447 	 .callback = dmi_ignore_irq0_timer_override,
1448 	 .ident = "HP NX6125 laptop",
1449 	 .matches = {
1450 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1451 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1452 		     },
1453 	 },
1454 	{
1455 	 .callback = dmi_ignore_irq0_timer_override,
1456 	 .ident = "HP NX6325 laptop",
1457 	 .matches = {
1458 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1459 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1460 		     },
1461 	 },
1462 	{
1463 	 .callback = dmi_ignore_irq0_timer_override,
1464 	 .ident = "HP 6715b laptop",
1465 	 .matches = {
1466 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1467 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1468 		     },
1469 	 },
1470 	{
1471 	 .callback = dmi_ignore_irq0_timer_override,
1472 	 .ident = "FUJITSU SIEMENS",
1473 	 .matches = {
1474 		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1475 		     DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1476 		     },
1477 	 },
1478 	{}
1479 };
1480 
1481 /*
1482  * acpi_boot_table_init() and acpi_boot_init()
1483  *  called from setup_arch(), always.
1484  *	1. checksums all tables
1485  *	2. enumerates lapics
1486  *	3. enumerates io-apics
1487  *
1488  * acpi_table_init() is separate to allow reading SRAT without
1489  * other side effects.
1490  *
1491  * side effects of acpi_boot_init:
1492  *	acpi_lapic = 1 if LAPIC found
1493  *	acpi_ioapic = 1 if IOAPIC found
1494  *	if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1495  *	if acpi_blacklisted() acpi_disabled = 1;
1496  *	acpi_irq_model=...
1497  *	...
1498  */
1499 
1500 void __init acpi_boot_table_init(void)
1501 {
1502 	dmi_check_system(acpi_dmi_table);
1503 
1504 	/*
1505 	 * If acpi_disabled, bail out
1506 	 */
1507 	if (acpi_disabled)
1508 		return;
1509 
1510 	/*
1511 	 * Initialize the ACPI boot-time table parser.
1512 	 */
1513 	if (acpi_table_init()) {
1514 		disable_acpi();
1515 		return;
1516 	}
1517 
1518 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1519 
1520 	/*
1521 	 * blacklist may disable ACPI entirely
1522 	 */
1523 	if (acpi_blacklisted()) {
1524 		if (acpi_force) {
1525 			printk(KERN_WARNING PREFIX "acpi=force override\n");
1526 		} else {
1527 			printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1528 			disable_acpi();
1529 			return;
1530 		}
1531 	}
1532 }
1533 
1534 int __init early_acpi_boot_init(void)
1535 {
1536 	/*
1537 	 * If acpi_disabled, bail out
1538 	 */
1539 	if (acpi_disabled)
1540 		return 1;
1541 
1542 	/*
1543 	 * Process the Multiple APIC Description Table (MADT), if present
1544 	 */
1545 	early_acpi_process_madt();
1546 
1547 	/*
1548 	 * Hardware-reduced ACPI mode initialization:
1549 	 */
1550 	acpi_reduced_hw_init();
1551 
1552 	return 0;
1553 }
1554 
1555 int __init acpi_boot_init(void)
1556 {
1557 	/* those are executed after early-quirks are executed */
1558 	dmi_check_system(acpi_dmi_table_late);
1559 
1560 	/*
1561 	 * If acpi_disabled, bail out
1562 	 */
1563 	if (acpi_disabled)
1564 		return 1;
1565 
1566 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1567 
1568 	/*
1569 	 * set sci_int and PM timer address
1570 	 */
1571 	acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1572 
1573 	/*
1574 	 * Process the Multiple APIC Description Table (MADT), if present
1575 	 */
1576 	acpi_process_madt();
1577 
1578 	acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1579 
1580 	if (!acpi_noirq)
1581 		x86_init.pci.init = pci_acpi_init;
1582 
1583 	return 0;
1584 }
1585 
1586 static int __init parse_acpi(char *arg)
1587 {
1588 	if (!arg)
1589 		return -EINVAL;
1590 
1591 	/* "acpi=off" disables both ACPI table parsing and interpreter */
1592 	if (strcmp(arg, "off") == 0) {
1593 		disable_acpi();
1594 	}
1595 	/* acpi=force to over-ride black-list */
1596 	else if (strcmp(arg, "force") == 0) {
1597 		acpi_force = 1;
1598 		acpi_disabled = 0;
1599 	}
1600 	/* acpi=strict disables out-of-spec workarounds */
1601 	else if (strcmp(arg, "strict") == 0) {
1602 		acpi_strict = 1;
1603 	}
1604 	/* acpi=rsdt use RSDT instead of XSDT */
1605 	else if (strcmp(arg, "rsdt") == 0) {
1606 		acpi_gbl_do_not_use_xsdt = TRUE;
1607 	}
1608 	/* "acpi=noirq" disables ACPI interrupt routing */
1609 	else if (strcmp(arg, "noirq") == 0) {
1610 		acpi_noirq_set();
1611 	}
1612 	/* "acpi=copy_dsdt" copys DSDT */
1613 	else if (strcmp(arg, "copy_dsdt") == 0) {
1614 		acpi_gbl_copy_dsdt_locally = 1;
1615 	}
1616 	/* "acpi=nocmcff" disables FF mode for corrected errors */
1617 	else if (strcmp(arg, "nocmcff") == 0) {
1618 		acpi_disable_cmcff = 1;
1619 	} else {
1620 		/* Core will printk when we return error. */
1621 		return -EINVAL;
1622 	}
1623 	return 0;
1624 }
1625 early_param("acpi", parse_acpi);
1626 
1627 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1628 static int __init parse_pci(char *arg)
1629 {
1630 	if (arg && strcmp(arg, "noacpi") == 0)
1631 		acpi_disable_pci();
1632 	return 0;
1633 }
1634 early_param("pci", parse_pci);
1635 
1636 int __init acpi_mps_check(void)
1637 {
1638 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1639 /* mptable code is not built-in*/
1640 	if (acpi_disabled || acpi_noirq) {
1641 		printk(KERN_WARNING "MPS support code is not built-in.\n"
1642 		       "Using acpi=off or acpi=noirq or pci=noacpi "
1643 		       "may have problem\n");
1644 		return 1;
1645 	}
1646 #endif
1647 	return 0;
1648 }
1649 
1650 #ifdef CONFIG_X86_IO_APIC
1651 static int __init parse_acpi_skip_timer_override(char *arg)
1652 {
1653 	acpi_skip_timer_override = 1;
1654 	return 0;
1655 }
1656 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1657 
1658 static int __init parse_acpi_use_timer_override(char *arg)
1659 {
1660 	acpi_use_timer_override = 1;
1661 	return 0;
1662 }
1663 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1664 #endif /* CONFIG_X86_IO_APIC */
1665 
1666 static int __init setup_acpi_sci(char *s)
1667 {
1668 	if (!s)
1669 		return -EINVAL;
1670 	if (!strcmp(s, "edge"))
1671 		acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1672 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1673 	else if (!strcmp(s, "level"))
1674 		acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1675 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1676 	else if (!strcmp(s, "high"))
1677 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1678 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1679 	else if (!strcmp(s, "low"))
1680 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1681 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1682 	else
1683 		return -EINVAL;
1684 	return 0;
1685 }
1686 early_param("acpi_sci", setup_acpi_sci);
1687 
1688 int __acpi_acquire_global_lock(unsigned int *lock)
1689 {
1690 	unsigned int old, new, val;
1691 	do {
1692 		old = *lock;
1693 		new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1694 		val = cmpxchg(lock, old, new);
1695 	} while (unlikely (val != old));
1696 	return (new < 3) ? -1 : 0;
1697 }
1698 
1699 int __acpi_release_global_lock(unsigned int *lock)
1700 {
1701 	unsigned int old, new, val;
1702 	do {
1703 		old = *lock;
1704 		new = old & ~0x3;
1705 		val = cmpxchg(lock, old, new);
1706 	} while (unlikely (val != old));
1707 	return old & 0x1;
1708 }
1709 
1710 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1711 {
1712 	e820_add_region(addr, size, E820_ACPI);
1713 	update_e820();
1714 }
1715