1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
4  *
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
7  */
8 #define pr_fmt(fmt) "ACPI: " fmt
9 
10 #include <linux/init.h>
11 #include <linux/acpi.h>
12 #include <linux/acpi_pmtmr.h>
13 #include <linux/efi.h>
14 #include <linux/cpumask.h>
15 #include <linux/export.h>
16 #include <linux/dmi.h>
17 #include <linux/irq.h>
18 #include <linux/slab.h>
19 #include <linux/memblock.h>
20 #include <linux/ioport.h>
21 #include <linux/pci.h>
22 #include <linux/efi-bgrt.h>
23 #include <linux/serial_core.h>
24 #include <linux/pgtable.h>
25 
26 #include <asm/e820/api.h>
27 #include <asm/irqdomain.h>
28 #include <asm/pci_x86.h>
29 #include <asm/io_apic.h>
30 #include <asm/apic.h>
31 #include <asm/io.h>
32 #include <asm/mpspec.h>
33 #include <asm/smp.h>
34 #include <asm/i8259.h>
35 #include <asm/setup.h>
36 
37 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
38 static int __initdata acpi_force = 0;
39 int acpi_disabled;
40 EXPORT_SYMBOL(acpi_disabled);
41 
42 #ifdef	CONFIG_X86_64
43 # include <asm/proto.h>
44 #endif				/* X86 */
45 
46 int acpi_noirq;				/* skip ACPI IRQ initialization */
47 static int acpi_nobgrt;			/* skip ACPI BGRT */
48 int acpi_pci_disabled;		/* skip ACPI PCI scan and IRQ initialization */
49 EXPORT_SYMBOL(acpi_pci_disabled);
50 
51 int acpi_lapic;
52 int acpi_ioapic;
53 int acpi_strict;
54 int acpi_disable_cmcff;
55 
56 /* ACPI SCI override configuration */
57 u8 acpi_sci_flags __initdata;
58 u32 acpi_sci_override_gsi __initdata = INVALID_ACPI_IRQ;
59 int acpi_skip_timer_override __initdata;
60 int acpi_use_timer_override __initdata;
61 int acpi_fix_pin2_polarity __initdata;
62 
63 #ifdef CONFIG_X86_LOCAL_APIC
64 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
65 static bool acpi_support_online_capable;
66 #endif
67 
68 #ifdef CONFIG_X86_64
69 /* Physical address of the Multiprocessor Wakeup Structure mailbox */
70 static u64 acpi_mp_wake_mailbox_paddr;
71 /* Virtual address of the Multiprocessor Wakeup Structure mailbox */
72 static struct acpi_madt_multiproc_wakeup_mailbox *acpi_mp_wake_mailbox;
73 #endif
74 
75 #ifdef CONFIG_X86_IO_APIC
76 /*
77  * Locks related to IOAPIC hotplug
78  * Hotplug side:
79  *	->device_hotplug_lock
80  *		->acpi_ioapic_lock
81  *			->ioapic_lock
82  * Interrupt mapping side:
83  *	->acpi_ioapic_lock
84  *		->ioapic_mutex
85  *			->ioapic_lock
86  */
87 static DEFINE_MUTEX(acpi_ioapic_lock);
88 #endif
89 
90 /* --------------------------------------------------------------------------
91                               Boot-time Configuration
92    -------------------------------------------------------------------------- */
93 
94 /*
95  * The default interrupt routing model is PIC (8259).  This gets
96  * overridden if IOAPICs are enumerated (below).
97  */
98 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
99 
100 
101 /*
102  * ISA irqs by default are the first 16 gsis but can be
103  * any gsi as specified by an interrupt source override.
104  */
105 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
106 	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
107 };
108 
109 /*
110  * This is just a simple wrapper around early_memremap(),
111  * with sanity checks for phys == 0 and size == 0.
112  */
__acpi_map_table(unsigned long phys,unsigned long size)113 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
114 {
115 
116 	if (!phys || !size)
117 		return NULL;
118 
119 	return early_memremap(phys, size);
120 }
121 
__acpi_unmap_table(void __iomem * map,unsigned long size)122 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
123 {
124 	if (!map || !size)
125 		return;
126 
127 	early_memunmap(map, size);
128 }
129 
130 #ifdef CONFIG_X86_LOCAL_APIC
acpi_parse_madt(struct acpi_table_header * table)131 static int __init acpi_parse_madt(struct acpi_table_header *table)
132 {
133 	struct acpi_table_madt *madt = NULL;
134 
135 	if (!boot_cpu_has(X86_FEATURE_APIC))
136 		return -EINVAL;
137 
138 	madt = (struct acpi_table_madt *)table;
139 	if (!madt) {
140 		pr_warn("Unable to map MADT\n");
141 		return -ENODEV;
142 	}
143 
144 	if (madt->address) {
145 		acpi_lapic_addr = (u64) madt->address;
146 
147 		pr_debug("Local APIC address 0x%08x\n", madt->address);
148 	}
149 	if (madt->header.revision >= 5)
150 		acpi_support_online_capable = true;
151 
152 	default_acpi_madt_oem_check(madt->header.oem_id,
153 				    madt->header.oem_table_id);
154 
155 	return 0;
156 }
157 
158 /**
159  * acpi_register_lapic - register a local apic and generates a logic cpu number
160  * @id: local apic id to register
161  * @acpiid: ACPI id to register
162  * @enabled: this cpu is enabled or not
163  *
164  * Returns the logic cpu number which maps to the local apic
165  */
acpi_register_lapic(int id,u32 acpiid,u8 enabled)166 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
167 {
168 	unsigned int ver = 0;
169 	int cpu;
170 
171 	if (id >= MAX_LOCAL_APIC) {
172 		pr_info("skipped apicid that is too big\n");
173 		return -EINVAL;
174 	}
175 
176 	if (!enabled) {
177 		++disabled_cpus;
178 		return -EINVAL;
179 	}
180 
181 	if (boot_cpu_physical_apicid != -1U)
182 		ver = boot_cpu_apic_version;
183 
184 	cpu = generic_processor_info(id, ver);
185 	if (cpu >= 0)
186 		early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
187 
188 	return cpu;
189 }
190 
191 static int __init
acpi_parse_x2apic(union acpi_subtable_headers * header,const unsigned long end)192 acpi_parse_x2apic(union acpi_subtable_headers *header, const unsigned long end)
193 {
194 	struct acpi_madt_local_x2apic *processor = NULL;
195 #ifdef CONFIG_X86_X2APIC
196 	u32 apic_id;
197 	u8 enabled;
198 #endif
199 
200 	processor = (struct acpi_madt_local_x2apic *)header;
201 
202 	if (BAD_MADT_ENTRY(processor, end))
203 		return -EINVAL;
204 
205 	acpi_table_print_madt_entry(&header->common);
206 
207 #ifdef CONFIG_X86_X2APIC
208 	apic_id = processor->local_apic_id;
209 	enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
210 
211 	/* Ignore invalid ID */
212 	if (apic_id == 0xffffffff)
213 		return 0;
214 
215 	/*
216 	 * We need to register disabled CPU as well to permit
217 	 * counting disabled CPUs. This allows us to size
218 	 * cpus_possible_map more accurately, to permit
219 	 * to not preallocating memory for all NR_CPUS
220 	 * when we use CPU hotplug.
221 	 */
222 	if (!apic->apic_id_valid(apic_id)) {
223 		if (enabled)
224 			pr_warn("x2apic entry ignored\n");
225 		return 0;
226 	}
227 
228 	acpi_register_lapic(apic_id, processor->uid, enabled);
229 #else
230 	pr_warn("x2apic entry ignored\n");
231 #endif
232 
233 	return 0;
234 }
235 
236 static int __init
acpi_parse_lapic(union acpi_subtable_headers * header,const unsigned long end)237 acpi_parse_lapic(union acpi_subtable_headers * header, const unsigned long end)
238 {
239 	struct acpi_madt_local_apic *processor = NULL;
240 
241 	processor = (struct acpi_madt_local_apic *)header;
242 
243 	if (BAD_MADT_ENTRY(processor, end))
244 		return -EINVAL;
245 
246 	acpi_table_print_madt_entry(&header->common);
247 
248 	/* Ignore invalid ID */
249 	if (processor->id == 0xff)
250 		return 0;
251 
252 	/* don't register processors that can not be onlined */
253 	if (acpi_support_online_capable &&
254 	    !(processor->lapic_flags & ACPI_MADT_ENABLED) &&
255 	    !(processor->lapic_flags & ACPI_MADT_ONLINE_CAPABLE))
256 		return 0;
257 
258 	/*
259 	 * We need to register disabled CPU as well to permit
260 	 * counting disabled CPUs. This allows us to size
261 	 * cpus_possible_map more accurately, to permit
262 	 * to not preallocating memory for all NR_CPUS
263 	 * when we use CPU hotplug.
264 	 */
265 	acpi_register_lapic(processor->id,	/* APIC ID */
266 			    processor->processor_id, /* ACPI ID */
267 			    processor->lapic_flags & ACPI_MADT_ENABLED);
268 
269 	return 0;
270 }
271 
272 static int __init
acpi_parse_sapic(union acpi_subtable_headers * header,const unsigned long end)273 acpi_parse_sapic(union acpi_subtable_headers *header, const unsigned long end)
274 {
275 	struct acpi_madt_local_sapic *processor = NULL;
276 
277 	processor = (struct acpi_madt_local_sapic *)header;
278 
279 	if (BAD_MADT_ENTRY(processor, end))
280 		return -EINVAL;
281 
282 	acpi_table_print_madt_entry(&header->common);
283 
284 	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
285 			    processor->processor_id, /* ACPI ID */
286 			    processor->lapic_flags & ACPI_MADT_ENABLED);
287 
288 	return 0;
289 }
290 
291 static int __init
acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,const unsigned long end)292 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
293 			  const unsigned long end)
294 {
295 	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
296 
297 	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
298 
299 	if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
300 		return -EINVAL;
301 
302 	acpi_table_print_madt_entry(&header->common);
303 
304 	acpi_lapic_addr = lapic_addr_ovr->address;
305 
306 	return 0;
307 }
308 
309 static int __init
acpi_parse_x2apic_nmi(union acpi_subtable_headers * header,const unsigned long end)310 acpi_parse_x2apic_nmi(union acpi_subtable_headers *header,
311 		      const unsigned long end)
312 {
313 	struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
314 
315 	x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
316 
317 	if (BAD_MADT_ENTRY(x2apic_nmi, end))
318 		return -EINVAL;
319 
320 	acpi_table_print_madt_entry(&header->common);
321 
322 	if (x2apic_nmi->lint != 1)
323 		pr_warn("NMI not connected to LINT 1!\n");
324 
325 	return 0;
326 }
327 
328 static int __init
acpi_parse_lapic_nmi(union acpi_subtable_headers * header,const unsigned long end)329 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
330 {
331 	struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
332 
333 	lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
334 
335 	if (BAD_MADT_ENTRY(lapic_nmi, end))
336 		return -EINVAL;
337 
338 	acpi_table_print_madt_entry(&header->common);
339 
340 	if (lapic_nmi->lint != 1)
341 		pr_warn("NMI not connected to LINT 1!\n");
342 
343 	return 0;
344 }
345 
346 #ifdef CONFIG_X86_64
acpi_wakeup_cpu(int apicid,unsigned long start_ip)347 static int acpi_wakeup_cpu(int apicid, unsigned long start_ip)
348 {
349 	/*
350 	 * Remap mailbox memory only for the first call to acpi_wakeup_cpu().
351 	 *
352 	 * Wakeup of secondary CPUs is fully serialized in the core code.
353 	 * No need to protect acpi_mp_wake_mailbox from concurrent accesses.
354 	 */
355 	if (!acpi_mp_wake_mailbox) {
356 		acpi_mp_wake_mailbox = memremap(acpi_mp_wake_mailbox_paddr,
357 						sizeof(*acpi_mp_wake_mailbox),
358 						MEMREMAP_WB);
359 	}
360 
361 	/*
362 	 * Mailbox memory is shared between the firmware and OS. Firmware will
363 	 * listen on mailbox command address, and once it receives the wakeup
364 	 * command, the CPU associated with the given apicid will be booted.
365 	 *
366 	 * The value of 'apic_id' and 'wakeup_vector' must be visible to the
367 	 * firmware before the wakeup command is visible.  smp_store_release()
368 	 * ensures ordering and visibility.
369 	 */
370 	acpi_mp_wake_mailbox->apic_id	    = apicid;
371 	acpi_mp_wake_mailbox->wakeup_vector = start_ip;
372 	smp_store_release(&acpi_mp_wake_mailbox->command,
373 			  ACPI_MP_WAKE_COMMAND_WAKEUP);
374 
375 	/*
376 	 * Wait for the CPU to wake up.
377 	 *
378 	 * The CPU being woken up is essentially in a spin loop waiting to be
379 	 * woken up. It should not take long for it wake up and acknowledge by
380 	 * zeroing out ->command.
381 	 *
382 	 * ACPI specification doesn't provide any guidance on how long kernel
383 	 * has to wait for a wake up acknowledgement. It also doesn't provide
384 	 * a way to cancel a wake up request if it takes too long.
385 	 *
386 	 * In TDX environment, the VMM has control over how long it takes to
387 	 * wake up secondary. It can postpone scheduling secondary vCPU
388 	 * indefinitely. Giving up on wake up request and reporting error opens
389 	 * possible attack vector for VMM: it can wake up a secondary CPU when
390 	 * kernel doesn't expect it. Wait until positive result of the wake up
391 	 * request.
392 	 */
393 	while (READ_ONCE(acpi_mp_wake_mailbox->command))
394 		cpu_relax();
395 
396 	return 0;
397 }
398 #endif /* CONFIG_X86_64 */
399 #endif /* CONFIG_X86_LOCAL_APIC */
400 
401 #ifdef CONFIG_X86_IO_APIC
402 #define MP_ISA_BUS		0
403 
404 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
405 						u8 trigger, u32 gsi);
406 
mp_override_legacy_irq(u8 bus_irq,u8 polarity,u8 trigger,u32 gsi)407 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
408 					  u32 gsi)
409 {
410 	/*
411 	 * Check bus_irq boundary.
412 	 */
413 	if (bus_irq >= NR_IRQS_LEGACY) {
414 		pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
415 		return;
416 	}
417 
418 	/*
419 	 * TBD: This check is for faulty timer entries, where the override
420 	 *      erroneously sets the trigger to level, resulting in a HUGE
421 	 *      increase of timer interrupts!
422 	 */
423 	if ((bus_irq == 0) && (trigger == 3))
424 		trigger = 1;
425 
426 	if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
427 		return;
428 	/*
429 	 * Reset default identity mapping if gsi is also an legacy IRQ,
430 	 * otherwise there will be more than one entry with the same GSI
431 	 * and acpi_isa_irq_to_gsi() may give wrong result.
432 	 */
433 	if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
434 		isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
435 	isa_irq_to_gsi[bus_irq] = gsi;
436 }
437 
mp_config_acpi_gsi(struct device * dev,u32 gsi,int trigger,int polarity)438 static void mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
439 			int polarity)
440 {
441 #ifdef CONFIG_X86_MPPARSE
442 	struct mpc_intsrc mp_irq;
443 	struct pci_dev *pdev;
444 	unsigned char number;
445 	unsigned int devfn;
446 	int ioapic;
447 	u8 pin;
448 
449 	if (!acpi_ioapic)
450 		return;
451 	if (!dev || !dev_is_pci(dev))
452 		return;
453 
454 	pdev = to_pci_dev(dev);
455 	number = pdev->bus->number;
456 	devfn = pdev->devfn;
457 	pin = pdev->pin;
458 	/* print the entry should happen on mptable identically */
459 	mp_irq.type = MP_INTSRC;
460 	mp_irq.irqtype = mp_INT;
461 	mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
462 				(polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
463 	mp_irq.srcbus = number;
464 	mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
465 	ioapic = mp_find_ioapic(gsi);
466 	mp_irq.dstapic = mpc_ioapic_id(ioapic);
467 	mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
468 
469 	mp_save_irq(&mp_irq);
470 #endif
471 }
472 
mp_register_ioapic_irq(u8 bus_irq,u8 polarity,u8 trigger,u32 gsi)473 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
474 						u8 trigger, u32 gsi)
475 {
476 	struct mpc_intsrc mp_irq;
477 	int ioapic, pin;
478 
479 	/* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
480 	ioapic = mp_find_ioapic(gsi);
481 	if (ioapic < 0) {
482 		pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
483 		return ioapic;
484 	}
485 
486 	pin = mp_find_ioapic_pin(ioapic, gsi);
487 
488 	mp_irq.type = MP_INTSRC;
489 	mp_irq.irqtype = mp_INT;
490 	mp_irq.irqflag = (trigger << 2) | polarity;
491 	mp_irq.srcbus = MP_ISA_BUS;
492 	mp_irq.srcbusirq = bus_irq;
493 	mp_irq.dstapic = mpc_ioapic_id(ioapic);
494 	mp_irq.dstirq = pin;
495 
496 	mp_save_irq(&mp_irq);
497 
498 	return 0;
499 }
500 
501 static int __init
acpi_parse_ioapic(union acpi_subtable_headers * header,const unsigned long end)502 acpi_parse_ioapic(union acpi_subtable_headers * header, const unsigned long end)
503 {
504 	struct acpi_madt_io_apic *ioapic = NULL;
505 	struct ioapic_domain_cfg cfg = {
506 		.type = IOAPIC_DOMAIN_DYNAMIC,
507 		.ops = &mp_ioapic_irqdomain_ops,
508 	};
509 
510 	ioapic = (struct acpi_madt_io_apic *)header;
511 
512 	if (BAD_MADT_ENTRY(ioapic, end))
513 		return -EINVAL;
514 
515 	acpi_table_print_madt_entry(&header->common);
516 
517 	/* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
518 	if (ioapic->global_irq_base < nr_legacy_irqs())
519 		cfg.type = IOAPIC_DOMAIN_LEGACY;
520 
521 	mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
522 			   &cfg);
523 
524 	return 0;
525 }
526 
527 /*
528  * Parse Interrupt Source Override for the ACPI SCI
529  */
acpi_sci_ioapic_setup(u8 bus_irq,u16 polarity,u16 trigger,u32 gsi)530 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
531 {
532 	if (trigger == 0)	/* compatible SCI trigger is level */
533 		trigger = 3;
534 
535 	if (polarity == 0)	/* compatible SCI polarity is low */
536 		polarity = 3;
537 
538 	/* Command-line over-ride via acpi_sci= */
539 	if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
540 		trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
541 
542 	if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
543 		polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
544 
545 	if (bus_irq < NR_IRQS_LEGACY)
546 		mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
547 	else
548 		mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
549 
550 	acpi_penalize_sci_irq(bus_irq, trigger, polarity);
551 
552 	/*
553 	 * stash over-ride to indicate we've been here
554 	 * and for later update of acpi_gbl_FADT
555 	 */
556 	acpi_sci_override_gsi = gsi;
557 	return;
558 }
559 
560 static int __init
acpi_parse_int_src_ovr(union acpi_subtable_headers * header,const unsigned long end)561 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
562 		       const unsigned long end)
563 {
564 	struct acpi_madt_interrupt_override *intsrc = NULL;
565 
566 	intsrc = (struct acpi_madt_interrupt_override *)header;
567 
568 	if (BAD_MADT_ENTRY(intsrc, end))
569 		return -EINVAL;
570 
571 	acpi_table_print_madt_entry(&header->common);
572 
573 	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
574 		acpi_sci_ioapic_setup(intsrc->source_irq,
575 				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
576 				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
577 				      intsrc->global_irq);
578 		return 0;
579 	}
580 
581 	if (intsrc->source_irq == 0) {
582 		if (acpi_skip_timer_override) {
583 			pr_warn("BIOS IRQ0 override ignored.\n");
584 			return 0;
585 		}
586 
587 		if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
588 			&& (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
589 			intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
590 			pr_warn("BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
591 		}
592 	}
593 
594 	mp_override_legacy_irq(intsrc->source_irq,
595 				intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
596 				(intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
597 				intsrc->global_irq);
598 
599 	return 0;
600 }
601 
602 static int __init
acpi_parse_nmi_src(union acpi_subtable_headers * header,const unsigned long end)603 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
604 {
605 	struct acpi_madt_nmi_source *nmi_src = NULL;
606 
607 	nmi_src = (struct acpi_madt_nmi_source *)header;
608 
609 	if (BAD_MADT_ENTRY(nmi_src, end))
610 		return -EINVAL;
611 
612 	acpi_table_print_madt_entry(&header->common);
613 
614 	/* TBD: Support nimsrc entries? */
615 
616 	return 0;
617 }
618 
619 #endif				/* CONFIG_X86_IO_APIC */
620 
621 /*
622  * acpi_pic_sci_set_trigger()
623  *
624  * use ELCR to set PIC-mode trigger type for SCI
625  *
626  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
627  * it may require Edge Trigger -- use "acpi_sci=edge"
628  *
629  * Port 0x4d0-4d1 are ELCR1 and ELCR2, the Edge/Level Control Registers
630  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
631  * ELCR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
632  * ELCR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
633  */
634 
acpi_pic_sci_set_trigger(unsigned int irq,u16 trigger)635 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
636 {
637 	unsigned int mask = 1 << irq;
638 	unsigned int old, new;
639 
640 	/* Real old ELCR mask */
641 	old = inb(PIC_ELCR1) | (inb(PIC_ELCR2) << 8);
642 
643 	/*
644 	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
645 	 * since we will set it correctly as we enable the PCI irq
646 	 * routing.
647 	 */
648 	new = acpi_noirq ? old : 0;
649 
650 	/*
651 	 * Update SCI information in the ELCR, it isn't in the PCI
652 	 * routing tables..
653 	 */
654 	switch (trigger) {
655 	case 1:		/* Edge - clear */
656 		new &= ~mask;
657 		break;
658 	case 3:		/* Level - set */
659 		new |= mask;
660 		break;
661 	}
662 
663 	if (old == new)
664 		return;
665 
666 	pr_warn("setting ELCR to %04x (from %04x)\n", new, old);
667 	outb(new, PIC_ELCR1);
668 	outb(new >> 8, PIC_ELCR2);
669 }
670 
acpi_gsi_to_irq(u32 gsi,unsigned int * irqp)671 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
672 {
673 	int rc, irq, trigger, polarity;
674 
675 	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
676 		*irqp = gsi;
677 		return 0;
678 	}
679 
680 	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
681 	if (rc)
682 		return rc;
683 
684 	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
685 	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
686 	irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
687 	if (irq < 0)
688 		return irq;
689 
690 	*irqp = irq;
691 	return 0;
692 }
693 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
694 
acpi_isa_irq_to_gsi(unsigned isa_irq,u32 * gsi)695 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
696 {
697 	if (isa_irq < nr_legacy_irqs() &&
698 	    isa_irq_to_gsi[isa_irq] != INVALID_ACPI_IRQ) {
699 		*gsi = isa_irq_to_gsi[isa_irq];
700 		return 0;
701 	}
702 
703 	return -1;
704 }
705 
acpi_register_gsi_pic(struct device * dev,u32 gsi,int trigger,int polarity)706 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
707 				 int trigger, int polarity)
708 {
709 #ifdef CONFIG_PCI
710 	/*
711 	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
712 	 */
713 	if (trigger == ACPI_LEVEL_SENSITIVE)
714 		elcr_set_level_irq(gsi);
715 #endif
716 
717 	return gsi;
718 }
719 
720 #ifdef CONFIG_X86_LOCAL_APIC
acpi_register_gsi_ioapic(struct device * dev,u32 gsi,int trigger,int polarity)721 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
722 				    int trigger, int polarity)
723 {
724 	int irq = gsi;
725 #ifdef CONFIG_X86_IO_APIC
726 	int node;
727 	struct irq_alloc_info info;
728 
729 	node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
730 	trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
731 	polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
732 	ioapic_set_alloc_attr(&info, node, trigger, polarity);
733 
734 	mutex_lock(&acpi_ioapic_lock);
735 	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
736 	/* Don't set up the ACPI SCI because it's already set up */
737 	if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
738 		mp_config_acpi_gsi(dev, gsi, trigger, polarity);
739 	mutex_unlock(&acpi_ioapic_lock);
740 #endif
741 
742 	return irq;
743 }
744 
acpi_unregister_gsi_ioapic(u32 gsi)745 static void acpi_unregister_gsi_ioapic(u32 gsi)
746 {
747 #ifdef CONFIG_X86_IO_APIC
748 	int irq;
749 
750 	mutex_lock(&acpi_ioapic_lock);
751 	irq = mp_map_gsi_to_irq(gsi, 0, NULL);
752 	if (irq > 0)
753 		mp_unmap_irq(irq);
754 	mutex_unlock(&acpi_ioapic_lock);
755 #endif
756 }
757 #endif
758 
759 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
760 			   int trigger, int polarity) = acpi_register_gsi_pic;
761 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
762 
763 #ifdef CONFIG_ACPI_SLEEP
764 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
765 #else
766 int (*acpi_suspend_lowlevel)(void);
767 #endif
768 
769 /*
770  * success: return IRQ number (>=0)
771  * failure: return < 0
772  */
acpi_register_gsi(struct device * dev,u32 gsi,int trigger,int polarity)773 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
774 {
775 	return __acpi_register_gsi(dev, gsi, trigger, polarity);
776 }
777 EXPORT_SYMBOL_GPL(acpi_register_gsi);
778 
acpi_unregister_gsi(u32 gsi)779 void acpi_unregister_gsi(u32 gsi)
780 {
781 	if (__acpi_unregister_gsi)
782 		__acpi_unregister_gsi(gsi);
783 }
784 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
785 
786 #ifdef CONFIG_X86_LOCAL_APIC
acpi_set_irq_model_ioapic(void)787 static void __init acpi_set_irq_model_ioapic(void)
788 {
789 	acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
790 	__acpi_register_gsi = acpi_register_gsi_ioapic;
791 	__acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
792 	acpi_ioapic = 1;
793 }
794 #endif
795 
796 /*
797  *  ACPI based hotplug support for CPU
798  */
799 #ifdef CONFIG_ACPI_HOTPLUG_CPU
800 #include <acpi/processor.h>
801 
acpi_map_cpu2node(acpi_handle handle,int cpu,int physid)802 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
803 {
804 #ifdef CONFIG_ACPI_NUMA
805 	int nid;
806 
807 	nid = acpi_get_node(handle);
808 	if (nid != NUMA_NO_NODE) {
809 		set_apicid_to_node(physid, nid);
810 		numa_set_node(cpu, nid);
811 	}
812 #endif
813 	return 0;
814 }
815 
acpi_map_cpu(acpi_handle handle,phys_cpuid_t physid,u32 acpi_id,int * pcpu)816 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
817 		 int *pcpu)
818 {
819 	int cpu;
820 
821 	cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
822 	if (cpu < 0) {
823 		pr_info("Unable to map lapic to logical cpu number\n");
824 		return cpu;
825 	}
826 
827 	acpi_processor_set_pdc(handle);
828 	acpi_map_cpu2node(handle, cpu, physid);
829 
830 	*pcpu = cpu;
831 	return 0;
832 }
833 EXPORT_SYMBOL(acpi_map_cpu);
834 
acpi_unmap_cpu(int cpu)835 int acpi_unmap_cpu(int cpu)
836 {
837 #ifdef CONFIG_ACPI_NUMA
838 	set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
839 #endif
840 
841 	per_cpu(x86_cpu_to_apicid, cpu) = -1;
842 	set_cpu_present(cpu, false);
843 	num_processors--;
844 
845 	return (0);
846 }
847 EXPORT_SYMBOL(acpi_unmap_cpu);
848 #endif				/* CONFIG_ACPI_HOTPLUG_CPU */
849 
acpi_register_ioapic(acpi_handle handle,u64 phys_addr,u32 gsi_base)850 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
851 {
852 	int ret = -ENOSYS;
853 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
854 	int ioapic_id;
855 	u64 addr;
856 	struct ioapic_domain_cfg cfg = {
857 		.type = IOAPIC_DOMAIN_DYNAMIC,
858 		.ops = &mp_ioapic_irqdomain_ops,
859 	};
860 
861 	ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
862 	if (ioapic_id < 0) {
863 		unsigned long long uid;
864 		acpi_status status;
865 
866 		status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
867 					       NULL, &uid);
868 		if (ACPI_FAILURE(status)) {
869 			acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
870 			return -EINVAL;
871 		}
872 		ioapic_id = (int)uid;
873 	}
874 
875 	mutex_lock(&acpi_ioapic_lock);
876 	ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
877 	mutex_unlock(&acpi_ioapic_lock);
878 #endif
879 
880 	return ret;
881 }
882 EXPORT_SYMBOL(acpi_register_ioapic);
883 
acpi_unregister_ioapic(acpi_handle handle,u32 gsi_base)884 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
885 {
886 	int ret = -ENOSYS;
887 
888 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
889 	mutex_lock(&acpi_ioapic_lock);
890 	ret  = mp_unregister_ioapic(gsi_base);
891 	mutex_unlock(&acpi_ioapic_lock);
892 #endif
893 
894 	return ret;
895 }
896 EXPORT_SYMBOL(acpi_unregister_ioapic);
897 
898 /**
899  * acpi_ioapic_registered - Check whether IOAPIC associated with @gsi_base
900  *			    has been registered
901  * @handle:	ACPI handle of the IOAPIC device
902  * @gsi_base:	GSI base associated with the IOAPIC
903  *
904  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
905  * with acpi_register_ioapic()/acpi_unregister_ioapic().
906  */
acpi_ioapic_registered(acpi_handle handle,u32 gsi_base)907 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
908 {
909 	int ret = 0;
910 
911 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
912 	mutex_lock(&acpi_ioapic_lock);
913 	ret  = mp_ioapic_registered(gsi_base);
914 	mutex_unlock(&acpi_ioapic_lock);
915 #endif
916 
917 	return ret;
918 }
919 
acpi_parse_sbf(struct acpi_table_header * table)920 static int __init acpi_parse_sbf(struct acpi_table_header *table)
921 {
922 	struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
923 
924 	sbf_port = sb->cmos_index;	/* Save CMOS port */
925 
926 	return 0;
927 }
928 
929 #ifdef CONFIG_HPET_TIMER
930 #include <asm/hpet.h>
931 
932 static struct resource *hpet_res __initdata;
933 
acpi_parse_hpet(struct acpi_table_header * table)934 static int __init acpi_parse_hpet(struct acpi_table_header *table)
935 {
936 	struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
937 
938 	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
939 		pr_warn("HPET timers must be located in memory.\n");
940 		return -1;
941 	}
942 
943 	hpet_address = hpet_tbl->address.address;
944 	hpet_blockid = hpet_tbl->sequence;
945 
946 	/*
947 	 * Some broken BIOSes advertise HPET at 0x0. We really do not
948 	 * want to allocate a resource there.
949 	 */
950 	if (!hpet_address) {
951 		pr_warn("HPET id: %#x base: %#lx is invalid\n", hpet_tbl->id, hpet_address);
952 		return 0;
953 	}
954 #ifdef CONFIG_X86_64
955 	/*
956 	 * Some even more broken BIOSes advertise HPET at
957 	 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
958 	 * some noise:
959 	 */
960 	if (hpet_address == 0xfed0000000000000UL) {
961 		if (!hpet_force_user) {
962 			pr_warn("HPET id: %#x base: 0xfed0000000000000 is bogus, try hpet=force on the kernel command line to fix it up to 0xfed00000.\n",
963 				hpet_tbl->id);
964 			hpet_address = 0;
965 			return 0;
966 		}
967 		pr_warn("HPET id: %#x base: 0xfed0000000000000 fixed up to 0xfed00000.\n",
968 			hpet_tbl->id);
969 		hpet_address >>= 32;
970 	}
971 #endif
972 	pr_info("HPET id: %#x base: %#lx\n", hpet_tbl->id, hpet_address);
973 
974 	/*
975 	 * Allocate and initialize the HPET firmware resource for adding into
976 	 * the resource tree during the lateinit timeframe.
977 	 */
978 #define HPET_RESOURCE_NAME_SIZE 9
979 	hpet_res = memblock_alloc(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE,
980 				  SMP_CACHE_BYTES);
981 	if (!hpet_res)
982 		panic("%s: Failed to allocate %zu bytes\n", __func__,
983 		      sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
984 
985 	hpet_res->name = (void *)&hpet_res[1];
986 	hpet_res->flags = IORESOURCE_MEM;
987 	snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
988 		 hpet_tbl->sequence);
989 
990 	hpet_res->start = hpet_address;
991 	hpet_res->end = hpet_address + (1 * 1024) - 1;
992 
993 	return 0;
994 }
995 
996 /*
997  * hpet_insert_resource inserts the HPET resources used into the resource
998  * tree.
999  */
hpet_insert_resource(void)1000 static __init int hpet_insert_resource(void)
1001 {
1002 	if (!hpet_res)
1003 		return 1;
1004 
1005 	return insert_resource(&iomem_resource, hpet_res);
1006 }
1007 
1008 late_initcall(hpet_insert_resource);
1009 
1010 #else
1011 #define	acpi_parse_hpet	NULL
1012 #endif
1013 
acpi_parse_fadt(struct acpi_table_header * table)1014 static int __init acpi_parse_fadt(struct acpi_table_header *table)
1015 {
1016 	if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
1017 		pr_debug("no legacy devices present\n");
1018 		x86_platform.legacy.devices.pnpbios = 0;
1019 	}
1020 
1021 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
1022 	    !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
1023 	    x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
1024 		pr_debug("i8042 controller is absent\n");
1025 		x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
1026 	}
1027 
1028 	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
1029 		pr_debug("not registering RTC platform device\n");
1030 		x86_platform.legacy.rtc = 0;
1031 	}
1032 
1033 	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
1034 		pr_debug("probing for VGA not safe\n");
1035 		x86_platform.legacy.no_vga = 1;
1036 	}
1037 
1038 #ifdef CONFIG_X86_PM_TIMER
1039 	/* detect the location of the ACPI PM Timer */
1040 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
1041 		/* FADT rev. 2 */
1042 		if (acpi_gbl_FADT.xpm_timer_block.space_id !=
1043 		    ACPI_ADR_SPACE_SYSTEM_IO)
1044 			return 0;
1045 
1046 		pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
1047 		/*
1048 		 * "X" fields are optional extensions to the original V1.0
1049 		 * fields, so we must selectively expand V1.0 fields if the
1050 		 * corresponding X field is zero.
1051 	 	 */
1052 		if (!pmtmr_ioport)
1053 			pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1054 	} else {
1055 		/* FADT rev. 1 */
1056 		pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1057 	}
1058 	if (pmtmr_ioport)
1059 		pr_info("PM-Timer IO Port: %#x\n", pmtmr_ioport);
1060 #endif
1061 	return 0;
1062 }
1063 
1064 #ifdef	CONFIG_X86_LOCAL_APIC
1065 /*
1066  * Parse LAPIC entries in MADT
1067  * returns 0 on success, < 0 on error
1068  */
1069 
early_acpi_parse_madt_lapic_addr_ovr(void)1070 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
1071 {
1072 	int count;
1073 
1074 	if (!boot_cpu_has(X86_FEATURE_APIC))
1075 		return -ENODEV;
1076 
1077 	/*
1078 	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1079 	 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1080 	 */
1081 
1082 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1083 				      acpi_parse_lapic_addr_ovr, 0);
1084 	if (count < 0) {
1085 		pr_err("Error parsing LAPIC address override entry\n");
1086 		return count;
1087 	}
1088 
1089 	register_lapic_address(acpi_lapic_addr);
1090 
1091 	return count;
1092 }
1093 
acpi_parse_madt_lapic_entries(void)1094 static int __init acpi_parse_madt_lapic_entries(void)
1095 {
1096 	int count;
1097 	int x2count = 0;
1098 	int ret;
1099 	struct acpi_subtable_proc madt_proc[2];
1100 
1101 	if (!boot_cpu_has(X86_FEATURE_APIC))
1102 		return -ENODEV;
1103 
1104 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1105 				      acpi_parse_sapic, MAX_LOCAL_APIC);
1106 
1107 	if (!count) {
1108 		memset(madt_proc, 0, sizeof(madt_proc));
1109 		madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1110 		madt_proc[0].handler = acpi_parse_lapic;
1111 		madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1112 		madt_proc[1].handler = acpi_parse_x2apic;
1113 		ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1114 				sizeof(struct acpi_table_madt),
1115 				madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1116 		if (ret < 0) {
1117 			pr_err("Error parsing LAPIC/X2APIC entries\n");
1118 			return ret;
1119 		}
1120 
1121 		count = madt_proc[0].count;
1122 		x2count = madt_proc[1].count;
1123 	}
1124 	if (!count && !x2count) {
1125 		pr_err("No LAPIC entries present\n");
1126 		/* TBD: Cleanup to allow fallback to MPS */
1127 		return -ENODEV;
1128 	} else if (count < 0 || x2count < 0) {
1129 		pr_err("Error parsing LAPIC entry\n");
1130 		/* TBD: Cleanup to allow fallback to MPS */
1131 		return count;
1132 	}
1133 
1134 	x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1135 					acpi_parse_x2apic_nmi, 0);
1136 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1137 				      acpi_parse_lapic_nmi, 0);
1138 	if (count < 0 || x2count < 0) {
1139 		pr_err("Error parsing LAPIC NMI entry\n");
1140 		/* TBD: Cleanup to allow fallback to MPS */
1141 		return count;
1142 	}
1143 	return 0;
1144 }
1145 
1146 #ifdef CONFIG_X86_64
acpi_parse_mp_wake(union acpi_subtable_headers * header,const unsigned long end)1147 static int __init acpi_parse_mp_wake(union acpi_subtable_headers *header,
1148 				     const unsigned long end)
1149 {
1150 	struct acpi_madt_multiproc_wakeup *mp_wake;
1151 
1152 	if (!IS_ENABLED(CONFIG_SMP))
1153 		return -ENODEV;
1154 
1155 	mp_wake = (struct acpi_madt_multiproc_wakeup *)header;
1156 	if (BAD_MADT_ENTRY(mp_wake, end))
1157 		return -EINVAL;
1158 
1159 	acpi_table_print_madt_entry(&header->common);
1160 
1161 	acpi_mp_wake_mailbox_paddr = mp_wake->base_address;
1162 
1163 	acpi_wake_cpu_handler_update(acpi_wakeup_cpu);
1164 
1165 	return 0;
1166 }
1167 #endif				/* CONFIG_X86_64 */
1168 #endif				/* CONFIG_X86_LOCAL_APIC */
1169 
1170 #ifdef	CONFIG_X86_IO_APIC
mp_config_acpi_legacy_irqs(void)1171 static void __init mp_config_acpi_legacy_irqs(void)
1172 {
1173 	int i;
1174 	struct mpc_intsrc mp_irq;
1175 
1176 #ifdef CONFIG_EISA
1177 	/*
1178 	 * Fabricate the legacy ISA bus (bus #31).
1179 	 */
1180 	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1181 #endif
1182 	set_bit(MP_ISA_BUS, mp_bus_not_pci);
1183 	pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());
1184 
1185 	/*
1186 	 * Use the default configuration for the IRQs 0-15.  Unless
1187 	 * overridden by (MADT) interrupt source override entries.
1188 	 */
1189 	for (i = 0; i < nr_legacy_irqs(); i++) {
1190 		int ioapic, pin;
1191 		unsigned int dstapic;
1192 		int idx;
1193 		u32 gsi;
1194 
1195 		/* Locate the gsi that irq i maps to. */
1196 		if (acpi_isa_irq_to_gsi(i, &gsi))
1197 			continue;
1198 
1199 		/*
1200 		 * Locate the IOAPIC that manages the ISA IRQ.
1201 		 */
1202 		ioapic = mp_find_ioapic(gsi);
1203 		if (ioapic < 0)
1204 			continue;
1205 		pin = mp_find_ioapic_pin(ioapic, gsi);
1206 		dstapic = mpc_ioapic_id(ioapic);
1207 
1208 		for (idx = 0; idx < mp_irq_entries; idx++) {
1209 			struct mpc_intsrc *irq = mp_irqs + idx;
1210 
1211 			/* Do we already have a mapping for this ISA IRQ? */
1212 			if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1213 				break;
1214 
1215 			/* Do we already have a mapping for this IOAPIC pin */
1216 			if (irq->dstapic == dstapic && irq->dstirq == pin)
1217 				break;
1218 		}
1219 
1220 		if (idx != mp_irq_entries) {
1221 			pr_debug("ACPI: IRQ%d used by override.\n", i);
1222 			continue;	/* IRQ already used */
1223 		}
1224 
1225 		mp_irq.type = MP_INTSRC;
1226 		mp_irq.irqflag = 0;	/* Conforming */
1227 		mp_irq.srcbus = MP_ISA_BUS;
1228 		mp_irq.dstapic = dstapic;
1229 		mp_irq.irqtype = mp_INT;
1230 		mp_irq.srcbusirq = i; /* Identity mapped */
1231 		mp_irq.dstirq = pin;
1232 
1233 		mp_save_irq(&mp_irq);
1234 	}
1235 }
1236 
1237 /*
1238  * Parse IOAPIC related entries in MADT
1239  * returns 0 on success, < 0 on error
1240  */
acpi_parse_madt_ioapic_entries(void)1241 static int __init acpi_parse_madt_ioapic_entries(void)
1242 {
1243 	int count;
1244 
1245 	/*
1246 	 * ACPI interpreter is required to complete interrupt setup,
1247 	 * so if it is off, don't enumerate the io-apics with ACPI.
1248 	 * If MPS is present, it will handle them,
1249 	 * otherwise the system will stay in PIC mode
1250 	 */
1251 	if (acpi_disabled || acpi_noirq)
1252 		return -ENODEV;
1253 
1254 	if (!boot_cpu_has(X86_FEATURE_APIC))
1255 		return -ENODEV;
1256 
1257 	/*
1258 	 * if "noapic" boot option, don't look for IO-APICs
1259 	 */
1260 	if (skip_ioapic_setup) {
1261 		pr_info("Skipping IOAPIC probe due to 'noapic' option.\n");
1262 		return -ENODEV;
1263 	}
1264 
1265 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1266 				      MAX_IO_APICS);
1267 	if (!count) {
1268 		pr_err("No IOAPIC entries present\n");
1269 		return -ENODEV;
1270 	} else if (count < 0) {
1271 		pr_err("Error parsing IOAPIC entry\n");
1272 		return count;
1273 	}
1274 
1275 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1276 				      acpi_parse_int_src_ovr, nr_irqs);
1277 	if (count < 0) {
1278 		pr_err("Error parsing interrupt source overrides entry\n");
1279 		/* TBD: Cleanup to allow fallback to MPS */
1280 		return count;
1281 	}
1282 
1283 	/*
1284 	 * If BIOS did not supply an INT_SRC_OVR for the SCI
1285 	 * pretend we got one so we can set the SCI flags.
1286 	 * But ignore setting up SCI on hardware reduced platforms.
1287 	 */
1288 	if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
1289 		acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1290 				      acpi_gbl_FADT.sci_interrupt);
1291 
1292 	/* Fill in identity legacy mappings where no override */
1293 	mp_config_acpi_legacy_irqs();
1294 
1295 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1296 				      acpi_parse_nmi_src, nr_irqs);
1297 	if (count < 0) {
1298 		pr_err("Error parsing NMI SRC entry\n");
1299 		/* TBD: Cleanup to allow fallback to MPS */
1300 		return count;
1301 	}
1302 
1303 	return 0;
1304 }
1305 #else
acpi_parse_madt_ioapic_entries(void)1306 static inline int acpi_parse_madt_ioapic_entries(void)
1307 {
1308 	return -1;
1309 }
1310 #endif	/* !CONFIG_X86_IO_APIC */
1311 
early_acpi_process_madt(void)1312 static void __init early_acpi_process_madt(void)
1313 {
1314 #ifdef CONFIG_X86_LOCAL_APIC
1315 	int error;
1316 
1317 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1318 
1319 		/*
1320 		 * Parse MADT LAPIC entries
1321 		 */
1322 		error = early_acpi_parse_madt_lapic_addr_ovr();
1323 		if (!error) {
1324 			acpi_lapic = 1;
1325 			smp_found_config = 1;
1326 		}
1327 		if (error == -EINVAL) {
1328 			/*
1329 			 * Dell Precision Workstation 410, 610 come here.
1330 			 */
1331 			pr_err("Invalid BIOS MADT, disabling ACPI\n");
1332 			disable_acpi();
1333 		}
1334 	}
1335 #endif
1336 }
1337 
acpi_process_madt(void)1338 static void __init acpi_process_madt(void)
1339 {
1340 #ifdef CONFIG_X86_LOCAL_APIC
1341 	int error;
1342 
1343 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1344 
1345 		/*
1346 		 * Parse MADT LAPIC entries
1347 		 */
1348 		error = acpi_parse_madt_lapic_entries();
1349 		if (!error) {
1350 			acpi_lapic = 1;
1351 
1352 			/*
1353 			 * Parse MADT IO-APIC entries
1354 			 */
1355 			mutex_lock(&acpi_ioapic_lock);
1356 			error = acpi_parse_madt_ioapic_entries();
1357 			mutex_unlock(&acpi_ioapic_lock);
1358 			if (!error) {
1359 				acpi_set_irq_model_ioapic();
1360 
1361 				smp_found_config = 1;
1362 			}
1363 
1364 #ifdef CONFIG_X86_64
1365 			/*
1366 			 * Parse MADT MP Wake entry.
1367 			 */
1368 			acpi_table_parse_madt(ACPI_MADT_TYPE_MULTIPROC_WAKEUP,
1369 					      acpi_parse_mp_wake, 1);
1370 #endif
1371 		}
1372 		if (error == -EINVAL) {
1373 			/*
1374 			 * Dell Precision Workstation 410, 610 come here.
1375 			 */
1376 			pr_err("Invalid BIOS MADT, disabling ACPI\n");
1377 			disable_acpi();
1378 		}
1379 	} else {
1380 		/*
1381  		 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1382  		 * In the event an MPS table was found, forget it.
1383  		 * Boot with "acpi=off" to use MPS on such a system.
1384  		 */
1385 		if (smp_found_config) {
1386 			pr_warn("No APIC-table, disabling MPS\n");
1387 			smp_found_config = 0;
1388 		}
1389 	}
1390 
1391 	/*
1392 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1393 	 * processors, where MPS only supports physical.
1394 	 */
1395 	if (acpi_lapic && acpi_ioapic)
1396 		pr_info("Using ACPI (MADT) for SMP configuration information\n");
1397 	else if (acpi_lapic)
1398 		pr_info("Using ACPI for processor (LAPIC) configuration information\n");
1399 #endif
1400 	return;
1401 }
1402 
disable_acpi_irq(const struct dmi_system_id * d)1403 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1404 {
1405 	if (!acpi_force) {
1406 		pr_notice("%s detected: force use of acpi=noirq\n", d->ident);
1407 		acpi_noirq_set();
1408 	}
1409 	return 0;
1410 }
1411 
disable_acpi_pci(const struct dmi_system_id * d)1412 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1413 {
1414 	if (!acpi_force) {
1415 		pr_notice("%s detected: force use of pci=noacpi\n", d->ident);
1416 		acpi_disable_pci();
1417 	}
1418 	return 0;
1419 }
1420 
disable_acpi_xsdt(const struct dmi_system_id * d)1421 static int __init disable_acpi_xsdt(const struct dmi_system_id *d)
1422 {
1423 	if (!acpi_force) {
1424 		pr_notice("%s detected: force use of acpi=rsdt\n", d->ident);
1425 		acpi_gbl_do_not_use_xsdt = TRUE;
1426 	} else {
1427 		pr_notice("Warning: DMI blacklist says broken, but acpi XSDT forced\n");
1428 	}
1429 	return 0;
1430 }
1431 
dmi_disable_acpi(const struct dmi_system_id * d)1432 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1433 {
1434 	if (!acpi_force) {
1435 		pr_notice("%s detected: acpi off\n", d->ident);
1436 		disable_acpi();
1437 	} else {
1438 		pr_notice("Warning: DMI blacklist says broken, but acpi forced\n");
1439 	}
1440 	return 0;
1441 }
1442 
1443 /*
1444  * Force ignoring BIOS IRQ0 override
1445  */
dmi_ignore_irq0_timer_override(const struct dmi_system_id * d)1446 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1447 {
1448 	if (!acpi_skip_timer_override) {
1449 		pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1450 			d->ident);
1451 		acpi_skip_timer_override = 1;
1452 	}
1453 	return 0;
1454 }
1455 
1456 /*
1457  * ACPI offers an alternative platform interface model that removes
1458  * ACPI hardware requirements for platforms that do not implement
1459  * the PC Architecture.
1460  *
1461  * We initialize the Hardware-reduced ACPI model here:
1462  */
acpi_generic_reduced_hw_init(void)1463 void __init acpi_generic_reduced_hw_init(void)
1464 {
1465 	/*
1466 	 * Override x86_init functions and bypass legacy PIC in
1467 	 * hardware reduced ACPI mode.
1468 	 */
1469 	x86_init.timers.timer_init	= x86_init_noop;
1470 	x86_init.irqs.pre_vector_init	= x86_init_noop;
1471 	legacy_pic			= &null_legacy_pic;
1472 }
1473 
acpi_reduced_hw_init(void)1474 static void __init acpi_reduced_hw_init(void)
1475 {
1476 	if (acpi_gbl_reduced_hardware)
1477 		x86_init.acpi.reduced_hw_early_init();
1478 }
1479 
1480 /*
1481  * If your system is blacklisted here, but you find that acpi=force
1482  * works for you, please contact linux-acpi@vger.kernel.org
1483  */
1484 static const struct dmi_system_id acpi_dmi_table[] __initconst = {
1485 	/*
1486 	 * Boxes that need ACPI disabled
1487 	 */
1488 	{
1489 	 .callback = dmi_disable_acpi,
1490 	 .ident = "IBM Thinkpad",
1491 	 .matches = {
1492 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1493 		     DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1494 		     },
1495 	 },
1496 
1497 	/*
1498 	 * Boxes that need ACPI PCI IRQ routing disabled
1499 	 */
1500 	{
1501 	 .callback = disable_acpi_irq,
1502 	 .ident = "ASUS A7V",
1503 	 .matches = {
1504 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1505 		     DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1506 		     /* newer BIOS, Revision 1011, does work */
1507 		     DMI_MATCH(DMI_BIOS_VERSION,
1508 			       "ASUS A7V ACPI BIOS Revision 1007"),
1509 		     },
1510 	 },
1511 	{
1512 		/*
1513 		 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1514 		 * for LPC bridge, which is needed for the PCI
1515 		 * interrupt links to work. DSDT fix is in bug 5966.
1516 		 * 2645, 2646 model numbers are shared with 600/600E/600X
1517 		 */
1518 	 .callback = disable_acpi_irq,
1519 	 .ident = "IBM Thinkpad 600 Series 2645",
1520 	 .matches = {
1521 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1522 		     DMI_MATCH(DMI_BOARD_NAME, "2645"),
1523 		     },
1524 	 },
1525 	{
1526 	 .callback = disable_acpi_irq,
1527 	 .ident = "IBM Thinkpad 600 Series 2646",
1528 	 .matches = {
1529 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1530 		     DMI_MATCH(DMI_BOARD_NAME, "2646"),
1531 		     },
1532 	 },
1533 	/*
1534 	 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1535 	 */
1536 	{			/* _BBN 0 bug */
1537 	 .callback = disable_acpi_pci,
1538 	 .ident = "ASUS PR-DLS",
1539 	 .matches = {
1540 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1541 		     DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1542 		     DMI_MATCH(DMI_BIOS_VERSION,
1543 			       "ASUS PR-DLS ACPI BIOS Revision 1010"),
1544 		     DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1545 		     },
1546 	 },
1547 	{
1548 	 .callback = disable_acpi_pci,
1549 	 .ident = "Acer TravelMate 36x Laptop",
1550 	 .matches = {
1551 		     DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1552 		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1553 		     },
1554 	 },
1555 	/*
1556 	 * Boxes that need ACPI XSDT use disabled due to corrupted tables
1557 	 */
1558 	{
1559 	 .callback = disable_acpi_xsdt,
1560 	 .ident = "Advantech DAC-BJ01",
1561 	 .matches = {
1562 		     DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1563 		     DMI_MATCH(DMI_PRODUCT_NAME, "Bearlake CRB Board"),
1564 		     DMI_MATCH(DMI_BIOS_VERSION, "V1.12"),
1565 		     DMI_MATCH(DMI_BIOS_DATE, "02/01/2011"),
1566 		     },
1567 	 },
1568 	{}
1569 };
1570 
1571 /* second table for DMI checks that should run after early-quirks */
1572 static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
1573 	/*
1574 	 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1575 	 * which includes some code which overrides all temperature
1576 	 * trip points to 16C if the INTIN2 input of the I/O APIC
1577 	 * is enabled.  This input is incorrectly designated the
1578 	 * ISA IRQ 0 via an interrupt source override even though
1579 	 * it is wired to the output of the master 8259A and INTIN0
1580 	 * is not connected at all.  Force ignoring BIOS IRQ0
1581 	 * override in that cases.
1582 	 */
1583 	{
1584 	 .callback = dmi_ignore_irq0_timer_override,
1585 	 .ident = "HP nx6115 laptop",
1586 	 .matches = {
1587 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1588 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1589 		     },
1590 	 },
1591 	{
1592 	 .callback = dmi_ignore_irq0_timer_override,
1593 	 .ident = "HP NX6125 laptop",
1594 	 .matches = {
1595 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1596 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1597 		     },
1598 	 },
1599 	{
1600 	 .callback = dmi_ignore_irq0_timer_override,
1601 	 .ident = "HP NX6325 laptop",
1602 	 .matches = {
1603 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1604 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1605 		     },
1606 	 },
1607 	{
1608 	 .callback = dmi_ignore_irq0_timer_override,
1609 	 .ident = "HP 6715b laptop",
1610 	 .matches = {
1611 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1612 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1613 		     },
1614 	 },
1615 	{
1616 	 .callback = dmi_ignore_irq0_timer_override,
1617 	 .ident = "FUJITSU SIEMENS",
1618 	 .matches = {
1619 		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1620 		     DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1621 		     },
1622 	 },
1623 	{}
1624 };
1625 
1626 /*
1627  * acpi_boot_table_init() and acpi_boot_init()
1628  *  called from setup_arch(), always.
1629  *	1. checksums all tables
1630  *	2. enumerates lapics
1631  *	3. enumerates io-apics
1632  *
1633  * acpi_table_init() is separate to allow reading SRAT without
1634  * other side effects.
1635  *
1636  * side effects of acpi_boot_init:
1637  *	acpi_lapic = 1 if LAPIC found
1638  *	acpi_ioapic = 1 if IOAPIC found
1639  *	if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1640  *	if acpi_blacklisted() acpi_disabled = 1;
1641  *	acpi_irq_model=...
1642  *	...
1643  */
1644 
acpi_boot_table_init(void)1645 void __init acpi_boot_table_init(void)
1646 {
1647 	dmi_check_system(acpi_dmi_table);
1648 
1649 	/*
1650 	 * If acpi_disabled, bail out
1651 	 */
1652 	if (acpi_disabled)
1653 		return;
1654 
1655 	/*
1656 	 * Initialize the ACPI boot-time table parser.
1657 	 */
1658 	if (acpi_locate_initial_tables())
1659 		disable_acpi();
1660 	else
1661 		acpi_reserve_initial_tables();
1662 }
1663 
early_acpi_boot_init(void)1664 int __init early_acpi_boot_init(void)
1665 {
1666 	if (acpi_disabled)
1667 		return 1;
1668 
1669 	acpi_table_init_complete();
1670 
1671 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1672 
1673 	/*
1674 	 * blacklist may disable ACPI entirely
1675 	 */
1676 	if (acpi_blacklisted()) {
1677 		if (acpi_force) {
1678 			pr_warn("acpi=force override\n");
1679 		} else {
1680 			pr_warn("Disabling ACPI support\n");
1681 			disable_acpi();
1682 			return 1;
1683 		}
1684 	}
1685 
1686 	/*
1687 	 * Process the Multiple APIC Description Table (MADT), if present
1688 	 */
1689 	early_acpi_process_madt();
1690 
1691 	/*
1692 	 * Hardware-reduced ACPI mode initialization:
1693 	 */
1694 	acpi_reduced_hw_init();
1695 
1696 	return 0;
1697 }
1698 
acpi_boot_init(void)1699 int __init acpi_boot_init(void)
1700 {
1701 	/* those are executed after early-quirks are executed */
1702 	dmi_check_system(acpi_dmi_table_late);
1703 
1704 	/*
1705 	 * If acpi_disabled, bail out
1706 	 */
1707 	if (acpi_disabled)
1708 		return 1;
1709 
1710 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1711 
1712 	/*
1713 	 * set sci_int and PM timer address
1714 	 */
1715 	acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1716 
1717 	/*
1718 	 * Process the Multiple APIC Description Table (MADT), if present
1719 	 */
1720 	acpi_process_madt();
1721 
1722 	acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1723 	if (IS_ENABLED(CONFIG_ACPI_BGRT) && !acpi_nobgrt)
1724 		acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1725 
1726 	if (!acpi_noirq)
1727 		x86_init.pci.init = pci_acpi_init;
1728 
1729 	/* Do not enable ACPI SPCR console by default */
1730 	acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
1731 	return 0;
1732 }
1733 
parse_acpi(char * arg)1734 static int __init parse_acpi(char *arg)
1735 {
1736 	if (!arg)
1737 		return -EINVAL;
1738 
1739 	/* "acpi=off" disables both ACPI table parsing and interpreter */
1740 	if (strcmp(arg, "off") == 0) {
1741 		disable_acpi();
1742 	}
1743 	/* acpi=force to over-ride black-list */
1744 	else if (strcmp(arg, "force") == 0) {
1745 		acpi_force = 1;
1746 		acpi_disabled = 0;
1747 	}
1748 	/* acpi=strict disables out-of-spec workarounds */
1749 	else if (strcmp(arg, "strict") == 0) {
1750 		acpi_strict = 1;
1751 	}
1752 	/* acpi=rsdt use RSDT instead of XSDT */
1753 	else if (strcmp(arg, "rsdt") == 0) {
1754 		acpi_gbl_do_not_use_xsdt = TRUE;
1755 	}
1756 	/* "acpi=noirq" disables ACPI interrupt routing */
1757 	else if (strcmp(arg, "noirq") == 0) {
1758 		acpi_noirq_set();
1759 	}
1760 	/* "acpi=copy_dsdt" copies DSDT */
1761 	else if (strcmp(arg, "copy_dsdt") == 0) {
1762 		acpi_gbl_copy_dsdt_locally = 1;
1763 	}
1764 	/* "acpi=nocmcff" disables FF mode for corrected errors */
1765 	else if (strcmp(arg, "nocmcff") == 0) {
1766 		acpi_disable_cmcff = 1;
1767 	} else {
1768 		/* Core will printk when we return error. */
1769 		return -EINVAL;
1770 	}
1771 	return 0;
1772 }
1773 early_param("acpi", parse_acpi);
1774 
parse_acpi_bgrt(char * arg)1775 static int __init parse_acpi_bgrt(char *arg)
1776 {
1777 	acpi_nobgrt = true;
1778 	return 0;
1779 }
1780 early_param("bgrt_disable", parse_acpi_bgrt);
1781 
1782 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
parse_pci(char * arg)1783 static int __init parse_pci(char *arg)
1784 {
1785 	if (arg && strcmp(arg, "noacpi") == 0)
1786 		acpi_disable_pci();
1787 	return 0;
1788 }
1789 early_param("pci", parse_pci);
1790 
acpi_mps_check(void)1791 int __init acpi_mps_check(void)
1792 {
1793 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1794 /* mptable code is not built-in*/
1795 	if (acpi_disabled || acpi_noirq) {
1796 		pr_warn("MPS support code is not built-in, using acpi=off or acpi=noirq or pci=noacpi may have problem\n");
1797 		return 1;
1798 	}
1799 #endif
1800 	return 0;
1801 }
1802 
1803 #ifdef CONFIG_X86_IO_APIC
parse_acpi_skip_timer_override(char * arg)1804 static int __init parse_acpi_skip_timer_override(char *arg)
1805 {
1806 	acpi_skip_timer_override = 1;
1807 	return 0;
1808 }
1809 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1810 
parse_acpi_use_timer_override(char * arg)1811 static int __init parse_acpi_use_timer_override(char *arg)
1812 {
1813 	acpi_use_timer_override = 1;
1814 	return 0;
1815 }
1816 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1817 #endif /* CONFIG_X86_IO_APIC */
1818 
setup_acpi_sci(char * s)1819 static int __init setup_acpi_sci(char *s)
1820 {
1821 	if (!s)
1822 		return -EINVAL;
1823 	if (!strcmp(s, "edge"))
1824 		acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1825 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1826 	else if (!strcmp(s, "level"))
1827 		acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1828 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1829 	else if (!strcmp(s, "high"))
1830 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1831 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1832 	else if (!strcmp(s, "low"))
1833 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1834 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1835 	else
1836 		return -EINVAL;
1837 	return 0;
1838 }
1839 early_param("acpi_sci", setup_acpi_sci);
1840 
__acpi_acquire_global_lock(unsigned int * lock)1841 int __acpi_acquire_global_lock(unsigned int *lock)
1842 {
1843 	unsigned int old, new, val;
1844 	do {
1845 		old = *lock;
1846 		new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1847 		val = cmpxchg(lock, old, new);
1848 	} while (unlikely (val != old));
1849 	return ((new & 0x3) < 3) ? -1 : 0;
1850 }
1851 
__acpi_release_global_lock(unsigned int * lock)1852 int __acpi_release_global_lock(unsigned int *lock)
1853 {
1854 	unsigned int old, new, val;
1855 	do {
1856 		old = *lock;
1857 		new = old & ~0x3;
1858 		val = cmpxchg(lock, old, new);
1859 	} while (unlikely (val != old));
1860 	return old & 0x1;
1861 }
1862 
arch_reserve_mem_area(acpi_physical_address addr,size_t size)1863 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1864 {
1865 	e820__range_add(addr, size, E820_TYPE_NVS);
1866 	e820__update_table_print();
1867 }
1868 
x86_default_set_root_pointer(u64 addr)1869 void x86_default_set_root_pointer(u64 addr)
1870 {
1871 	boot_params.acpi_rsdp_addr = addr;
1872 }
1873 
x86_default_get_root_pointer(void)1874 u64 x86_default_get_root_pointer(void)
1875 {
1876 	return boot_params.acpi_rsdp_addr;
1877 }
1878