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 bool acpi_int_src_ovr[NR_IRQS_LEGACY];
56 
57 /* ACPI SCI override configuration */
58 u8 acpi_sci_flags __initdata;
59 u32 acpi_sci_override_gsi __initdata = INVALID_ACPI_IRQ;
60 int acpi_skip_timer_override __initdata;
61 int acpi_use_timer_override __initdata;
62 int acpi_fix_pin2_polarity __initdata;
63 
64 #ifdef CONFIG_X86_LOCAL_APIC
65 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
66 static bool acpi_support_online_capable;
67 #endif
68 
69 #ifdef CONFIG_X86_64
70 /* Physical address of the Multiprocessor Wakeup Structure mailbox */
71 static u64 acpi_mp_wake_mailbox_paddr;
72 /* Virtual address of the Multiprocessor Wakeup Structure mailbox */
73 static struct acpi_madt_multiproc_wakeup_mailbox *acpi_mp_wake_mailbox;
74 #endif
75 
76 #ifdef CONFIG_X86_IO_APIC
77 /*
78  * Locks related to IOAPIC hotplug
79  * Hotplug side:
80  *	->device_hotplug_lock
81  *		->acpi_ioapic_lock
82  *			->ioapic_lock
83  * Interrupt mapping side:
84  *	->acpi_ioapic_lock
85  *		->ioapic_mutex
86  *			->ioapic_lock
87  */
88 static DEFINE_MUTEX(acpi_ioapic_lock);
89 #endif
90 
91 /* --------------------------------------------------------------------------
92                               Boot-time Configuration
93    -------------------------------------------------------------------------- */
94 
95 /*
96  * The default interrupt routing model is PIC (8259).  This gets
97  * overridden if IOAPICs are enumerated (below).
98  */
99 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
100 
101 
102 /*
103  * ISA irqs by default are the first 16 gsis but can be
104  * any gsi as specified by an interrupt source override.
105  */
106 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
107 	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
108 };
109 
110 /*
111  * This is just a simple wrapper around early_memremap(),
112  * with sanity checks for phys == 0 and size == 0.
113  */
__acpi_map_table(unsigned long phys,unsigned long size)114 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
115 {
116 
117 	if (!phys || !size)
118 		return NULL;
119 
120 	return early_memremap(phys, size);
121 }
122 
__acpi_unmap_table(void __iomem * map,unsigned long size)123 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
124 {
125 	if (!map || !size)
126 		return;
127 
128 	early_memunmap(map, size);
129 }
130 
131 #ifdef CONFIG_X86_LOCAL_APIC
acpi_parse_madt(struct acpi_table_header * table)132 static int __init acpi_parse_madt(struct acpi_table_header *table)
133 {
134 	struct acpi_table_madt *madt = NULL;
135 
136 	if (!boot_cpu_has(X86_FEATURE_APIC))
137 		return -EINVAL;
138 
139 	madt = (struct acpi_table_madt *)table;
140 	if (!madt) {
141 		pr_warn("Unable to map MADT\n");
142 		return -ENODEV;
143 	}
144 
145 	if (madt->address) {
146 		acpi_lapic_addr = (u64) madt->address;
147 
148 		pr_debug("Local APIC address 0x%08x\n", madt->address);
149 	}
150 
151 	if (madt->flags & ACPI_MADT_PCAT_COMPAT)
152 		legacy_pic_pcat_compat();
153 
154 	/* ACPI 6.3 and newer support the online capable bit. */
155 	if (acpi_gbl_FADT.header.revision > 6 ||
156 	    (acpi_gbl_FADT.header.revision == 6 &&
157 	     acpi_gbl_FADT.minor_revision >= 3))
158 		acpi_support_online_capable = true;
159 
160 	default_acpi_madt_oem_check(madt->header.oem_id,
161 				    madt->header.oem_table_id);
162 
163 	return 0;
164 }
165 
166 /**
167  * acpi_register_lapic - register a local apic and generates a logic cpu number
168  * @id: local apic id to register
169  * @acpiid: ACPI id to register
170  * @enabled: this cpu is enabled or not
171  *
172  * Returns the logic cpu number which maps to the local apic
173  */
acpi_register_lapic(int id,u32 acpiid,u8 enabled)174 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
175 {
176 	int cpu;
177 
178 	if (id >= MAX_LOCAL_APIC) {
179 		pr_info("skipped apicid that is too big\n");
180 		return -EINVAL;
181 	}
182 
183 	if (!enabled) {
184 		++disabled_cpus;
185 		return -EINVAL;
186 	}
187 
188 	cpu = generic_processor_info(id);
189 	if (cpu >= 0)
190 		early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
191 
192 	return cpu;
193 }
194 
acpi_is_processor_usable(u32 lapic_flags)195 static bool __init acpi_is_processor_usable(u32 lapic_flags)
196 {
197 	if (lapic_flags & ACPI_MADT_ENABLED)
198 		return true;
199 
200 	if (!acpi_support_online_capable ||
201 	    (lapic_flags & ACPI_MADT_ONLINE_CAPABLE))
202 		return true;
203 
204 	return false;
205 }
206 
207 static int __init
acpi_parse_x2apic(union acpi_subtable_headers * header,const unsigned long end)208 acpi_parse_x2apic(union acpi_subtable_headers *header, const unsigned long end)
209 {
210 	struct acpi_madt_local_x2apic *processor = NULL;
211 #ifdef CONFIG_X86_X2APIC
212 	u32 apic_id;
213 	u8 enabled;
214 #endif
215 
216 	processor = (struct acpi_madt_local_x2apic *)header;
217 
218 	if (BAD_MADT_ENTRY(processor, end))
219 		return -EINVAL;
220 
221 	acpi_table_print_madt_entry(&header->common);
222 
223 #ifdef CONFIG_X86_X2APIC
224 	apic_id = processor->local_apic_id;
225 	enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
226 
227 	/* Ignore invalid ID */
228 	if (apic_id == 0xffffffff)
229 		return 0;
230 
231 	/* don't register processors that cannot be onlined */
232 	if (!acpi_is_processor_usable(processor->lapic_flags))
233 		return 0;
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 	if (!apic_id_valid(apic_id)) {
243 		if (enabled)
244 			pr_warn("x2apic entry ignored\n");
245 		return 0;
246 	}
247 
248 	acpi_register_lapic(apic_id, processor->uid, enabled);
249 #else
250 	pr_warn("x2apic entry ignored\n");
251 #endif
252 
253 	return 0;
254 }
255 
256 static int __init
acpi_parse_lapic(union acpi_subtable_headers * header,const unsigned long end)257 acpi_parse_lapic(union acpi_subtable_headers * header, const unsigned long end)
258 {
259 	struct acpi_madt_local_apic *processor = NULL;
260 
261 	processor = (struct acpi_madt_local_apic *)header;
262 
263 	if (BAD_MADT_ENTRY(processor, end))
264 		return -EINVAL;
265 
266 	acpi_table_print_madt_entry(&header->common);
267 
268 	/* Ignore invalid ID */
269 	if (processor->id == 0xff)
270 		return 0;
271 
272 	/* don't register processors that can not be onlined */
273 	if (!acpi_is_processor_usable(processor->lapic_flags))
274 		return 0;
275 
276 	/*
277 	 * We need to register disabled CPU as well to permit
278 	 * counting disabled CPUs. This allows us to size
279 	 * cpus_possible_map more accurately, to permit
280 	 * to not preallocating memory for all NR_CPUS
281 	 * when we use CPU hotplug.
282 	 */
283 	acpi_register_lapic(processor->id,	/* APIC ID */
284 			    processor->processor_id, /* ACPI ID */
285 			    processor->lapic_flags & ACPI_MADT_ENABLED);
286 
287 	return 0;
288 }
289 
290 static int __init
acpi_parse_sapic(union acpi_subtable_headers * header,const unsigned long end)291 acpi_parse_sapic(union acpi_subtable_headers *header, const unsigned long end)
292 {
293 	struct acpi_madt_local_sapic *processor = NULL;
294 
295 	processor = (struct acpi_madt_local_sapic *)header;
296 
297 	if (BAD_MADT_ENTRY(processor, end))
298 		return -EINVAL;
299 
300 	acpi_table_print_madt_entry(&header->common);
301 
302 	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
303 			    processor->processor_id, /* ACPI ID */
304 			    processor->lapic_flags & ACPI_MADT_ENABLED);
305 
306 	return 0;
307 }
308 
309 static int __init
acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,const unsigned long end)310 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
311 			  const unsigned long end)
312 {
313 	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
314 
315 	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
316 
317 	if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
318 		return -EINVAL;
319 
320 	acpi_table_print_madt_entry(&header->common);
321 
322 	acpi_lapic_addr = lapic_addr_ovr->address;
323 
324 	return 0;
325 }
326 
327 static int __init
acpi_parse_x2apic_nmi(union acpi_subtable_headers * header,const unsigned long end)328 acpi_parse_x2apic_nmi(union acpi_subtable_headers *header,
329 		      const unsigned long end)
330 {
331 	struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
332 
333 	x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
334 
335 	if (BAD_MADT_ENTRY(x2apic_nmi, end))
336 		return -EINVAL;
337 
338 	acpi_table_print_madt_entry(&header->common);
339 
340 	if (x2apic_nmi->lint != 1)
341 		pr_warn("NMI not connected to LINT 1!\n");
342 
343 	return 0;
344 }
345 
346 static int __init
acpi_parse_lapic_nmi(union acpi_subtable_headers * header,const unsigned long end)347 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
348 {
349 	struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
350 
351 	lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
352 
353 	if (BAD_MADT_ENTRY(lapic_nmi, end))
354 		return -EINVAL;
355 
356 	acpi_table_print_madt_entry(&header->common);
357 
358 	if (lapic_nmi->lint != 1)
359 		pr_warn("NMI not connected to LINT 1!\n");
360 
361 	return 0;
362 }
363 
364 #ifdef CONFIG_X86_64
acpi_wakeup_cpu(int apicid,unsigned long start_ip)365 static int acpi_wakeup_cpu(int apicid, unsigned long start_ip)
366 {
367 	/*
368 	 * Remap mailbox memory only for the first call to acpi_wakeup_cpu().
369 	 *
370 	 * Wakeup of secondary CPUs is fully serialized in the core code.
371 	 * No need to protect acpi_mp_wake_mailbox from concurrent accesses.
372 	 */
373 	if (!acpi_mp_wake_mailbox) {
374 		acpi_mp_wake_mailbox = memremap(acpi_mp_wake_mailbox_paddr,
375 						sizeof(*acpi_mp_wake_mailbox),
376 						MEMREMAP_WB);
377 	}
378 
379 	/*
380 	 * Mailbox memory is shared between the firmware and OS. Firmware will
381 	 * listen on mailbox command address, and once it receives the wakeup
382 	 * command, the CPU associated with the given apicid will be booted.
383 	 *
384 	 * The value of 'apic_id' and 'wakeup_vector' must be visible to the
385 	 * firmware before the wakeup command is visible.  smp_store_release()
386 	 * ensures ordering and visibility.
387 	 */
388 	acpi_mp_wake_mailbox->apic_id	    = apicid;
389 	acpi_mp_wake_mailbox->wakeup_vector = start_ip;
390 	smp_store_release(&acpi_mp_wake_mailbox->command,
391 			  ACPI_MP_WAKE_COMMAND_WAKEUP);
392 
393 	/*
394 	 * Wait for the CPU to wake up.
395 	 *
396 	 * The CPU being woken up is essentially in a spin loop waiting to be
397 	 * woken up. It should not take long for it wake up and acknowledge by
398 	 * zeroing out ->command.
399 	 *
400 	 * ACPI specification doesn't provide any guidance on how long kernel
401 	 * has to wait for a wake up acknowledgement. It also doesn't provide
402 	 * a way to cancel a wake up request if it takes too long.
403 	 *
404 	 * In TDX environment, the VMM has control over how long it takes to
405 	 * wake up secondary. It can postpone scheduling secondary vCPU
406 	 * indefinitely. Giving up on wake up request and reporting error opens
407 	 * possible attack vector for VMM: it can wake up a secondary CPU when
408 	 * kernel doesn't expect it. Wait until positive result of the wake up
409 	 * request.
410 	 */
411 	while (READ_ONCE(acpi_mp_wake_mailbox->command))
412 		cpu_relax();
413 
414 	return 0;
415 }
416 #endif /* CONFIG_X86_64 */
417 #endif /* CONFIG_X86_LOCAL_APIC */
418 
419 #ifdef CONFIG_X86_IO_APIC
420 #define MP_ISA_BUS		0
421 
422 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
423 						u8 trigger, u32 gsi);
424 
mp_override_legacy_irq(u8 bus_irq,u8 polarity,u8 trigger,u32 gsi)425 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
426 					  u32 gsi)
427 {
428 	/*
429 	 * Check bus_irq boundary.
430 	 */
431 	if (bus_irq >= NR_IRQS_LEGACY) {
432 		pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
433 		return;
434 	}
435 
436 	/*
437 	 * TBD: This check is for faulty timer entries, where the override
438 	 *      erroneously sets the trigger to level, resulting in a HUGE
439 	 *      increase of timer interrupts!
440 	 */
441 	if ((bus_irq == 0) && (trigger == 3))
442 		trigger = 1;
443 
444 	if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
445 		return;
446 	/*
447 	 * Reset default identity mapping if gsi is also an legacy IRQ,
448 	 * otherwise there will be more than one entry with the same GSI
449 	 * and acpi_isa_irq_to_gsi() may give wrong result.
450 	 */
451 	if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
452 		isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
453 	isa_irq_to_gsi[bus_irq] = gsi;
454 }
455 
mp_config_acpi_gsi(struct device * dev,u32 gsi,int trigger,int polarity)456 static void mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
457 			int polarity)
458 {
459 #ifdef CONFIG_X86_MPPARSE
460 	struct mpc_intsrc mp_irq;
461 	struct pci_dev *pdev;
462 	unsigned char number;
463 	unsigned int devfn;
464 	int ioapic;
465 	u8 pin;
466 
467 	if (!acpi_ioapic)
468 		return;
469 	if (!dev || !dev_is_pci(dev))
470 		return;
471 
472 	pdev = to_pci_dev(dev);
473 	number = pdev->bus->number;
474 	devfn = pdev->devfn;
475 	pin = pdev->pin;
476 	/* print the entry should happen on mptable identically */
477 	mp_irq.type = MP_INTSRC;
478 	mp_irq.irqtype = mp_INT;
479 	mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
480 				(polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
481 	mp_irq.srcbus = number;
482 	mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
483 	ioapic = mp_find_ioapic(gsi);
484 	mp_irq.dstapic = mpc_ioapic_id(ioapic);
485 	mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
486 
487 	mp_save_irq(&mp_irq);
488 #endif
489 }
490 
mp_register_ioapic_irq(u8 bus_irq,u8 polarity,u8 trigger,u32 gsi)491 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
492 						u8 trigger, u32 gsi)
493 {
494 	struct mpc_intsrc mp_irq;
495 	int ioapic, pin;
496 
497 	/* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
498 	ioapic = mp_find_ioapic(gsi);
499 	if (ioapic < 0) {
500 		pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
501 		return ioapic;
502 	}
503 
504 	pin = mp_find_ioapic_pin(ioapic, gsi);
505 
506 	mp_irq.type = MP_INTSRC;
507 	mp_irq.irqtype = mp_INT;
508 	mp_irq.irqflag = (trigger << 2) | polarity;
509 	mp_irq.srcbus = MP_ISA_BUS;
510 	mp_irq.srcbusirq = bus_irq;
511 	mp_irq.dstapic = mpc_ioapic_id(ioapic);
512 	mp_irq.dstirq = pin;
513 
514 	mp_save_irq(&mp_irq);
515 
516 	return 0;
517 }
518 
519 static int __init
acpi_parse_ioapic(union acpi_subtable_headers * header,const unsigned long end)520 acpi_parse_ioapic(union acpi_subtable_headers * header, const unsigned long end)
521 {
522 	struct acpi_madt_io_apic *ioapic = NULL;
523 	struct ioapic_domain_cfg cfg = {
524 		.type = IOAPIC_DOMAIN_DYNAMIC,
525 		.ops = &mp_ioapic_irqdomain_ops,
526 	};
527 
528 	ioapic = (struct acpi_madt_io_apic *)header;
529 
530 	if (BAD_MADT_ENTRY(ioapic, end))
531 		return -EINVAL;
532 
533 	acpi_table_print_madt_entry(&header->common);
534 
535 	/* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
536 	if (ioapic->global_irq_base < nr_legacy_irqs())
537 		cfg.type = IOAPIC_DOMAIN_LEGACY;
538 
539 	mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
540 			   &cfg);
541 
542 	return 0;
543 }
544 
545 /*
546  * Parse Interrupt Source Override for the ACPI SCI
547  */
acpi_sci_ioapic_setup(u8 bus_irq,u16 polarity,u16 trigger,u32 gsi)548 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
549 {
550 	if (trigger == 0)	/* compatible SCI trigger is level */
551 		trigger = 3;
552 
553 	if (polarity == 0)	/* compatible SCI polarity is low */
554 		polarity = 3;
555 
556 	/* Command-line over-ride via acpi_sci= */
557 	if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
558 		trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
559 
560 	if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
561 		polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
562 
563 	if (bus_irq < NR_IRQS_LEGACY)
564 		mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
565 	else
566 		mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
567 
568 	acpi_penalize_sci_irq(bus_irq, trigger, polarity);
569 
570 	/*
571 	 * stash over-ride to indicate we've been here
572 	 * and for later update of acpi_gbl_FADT
573 	 */
574 	acpi_sci_override_gsi = gsi;
575 	return;
576 }
577 
578 static int __init
acpi_parse_int_src_ovr(union acpi_subtable_headers * header,const unsigned long end)579 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
580 		       const unsigned long end)
581 {
582 	struct acpi_madt_interrupt_override *intsrc = NULL;
583 
584 	intsrc = (struct acpi_madt_interrupt_override *)header;
585 
586 	if (BAD_MADT_ENTRY(intsrc, end))
587 		return -EINVAL;
588 
589 	acpi_table_print_madt_entry(&header->common);
590 
591 	if (intsrc->source_irq < NR_IRQS_LEGACY)
592 		acpi_int_src_ovr[intsrc->source_irq] = true;
593 
594 	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
595 		acpi_sci_ioapic_setup(intsrc->source_irq,
596 				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
597 				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
598 				      intsrc->global_irq);
599 		return 0;
600 	}
601 
602 	if (intsrc->source_irq == 0) {
603 		if (acpi_skip_timer_override) {
604 			pr_warn("BIOS IRQ0 override ignored.\n");
605 			return 0;
606 		}
607 
608 		if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
609 			&& (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
610 			intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
611 			pr_warn("BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
612 		}
613 	}
614 
615 	mp_override_legacy_irq(intsrc->source_irq,
616 				intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
617 				(intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
618 				intsrc->global_irq);
619 
620 	return 0;
621 }
622 
623 static int __init
acpi_parse_nmi_src(union acpi_subtable_headers * header,const unsigned long end)624 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
625 {
626 	struct acpi_madt_nmi_source *nmi_src = NULL;
627 
628 	nmi_src = (struct acpi_madt_nmi_source *)header;
629 
630 	if (BAD_MADT_ENTRY(nmi_src, end))
631 		return -EINVAL;
632 
633 	acpi_table_print_madt_entry(&header->common);
634 
635 	/* TBD: Support nimsrc entries? */
636 
637 	return 0;
638 }
639 
640 #endif				/* CONFIG_X86_IO_APIC */
641 
642 /*
643  * acpi_pic_sci_set_trigger()
644  *
645  * use ELCR to set PIC-mode trigger type for SCI
646  *
647  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
648  * it may require Edge Trigger -- use "acpi_sci=edge"
649  *
650  * Port 0x4d0-4d1 are ELCR1 and ELCR2, the Edge/Level Control Registers
651  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
652  * ELCR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
653  * ELCR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
654  */
655 
acpi_pic_sci_set_trigger(unsigned int irq,u16 trigger)656 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
657 {
658 	unsigned int mask = 1 << irq;
659 	unsigned int old, new;
660 
661 	/* Real old ELCR mask */
662 	old = inb(PIC_ELCR1) | (inb(PIC_ELCR2) << 8);
663 
664 	/*
665 	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
666 	 * since we will set it correctly as we enable the PCI irq
667 	 * routing.
668 	 */
669 	new = acpi_noirq ? old : 0;
670 
671 	/*
672 	 * Update SCI information in the ELCR, it isn't in the PCI
673 	 * routing tables..
674 	 */
675 	switch (trigger) {
676 	case 1:		/* Edge - clear */
677 		new &= ~mask;
678 		break;
679 	case 3:		/* Level - set */
680 		new |= mask;
681 		break;
682 	}
683 
684 	if (old == new)
685 		return;
686 
687 	pr_warn("setting ELCR to %04x (from %04x)\n", new, old);
688 	outb(new, PIC_ELCR1);
689 	outb(new >> 8, PIC_ELCR2);
690 }
691 
acpi_gsi_to_irq(u32 gsi,unsigned int * irqp)692 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
693 {
694 	int rc, irq, trigger, polarity;
695 
696 	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
697 		*irqp = gsi;
698 		return 0;
699 	}
700 
701 	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
702 	if (rc)
703 		return rc;
704 
705 	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
706 	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
707 	irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
708 	if (irq < 0)
709 		return irq;
710 
711 	*irqp = irq;
712 	return 0;
713 }
714 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
715 
acpi_isa_irq_to_gsi(unsigned isa_irq,u32 * gsi)716 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
717 {
718 	if (isa_irq < nr_legacy_irqs() &&
719 	    isa_irq_to_gsi[isa_irq] != INVALID_ACPI_IRQ) {
720 		*gsi = isa_irq_to_gsi[isa_irq];
721 		return 0;
722 	}
723 
724 	return -1;
725 }
726 
acpi_register_gsi_pic(struct device * dev,u32 gsi,int trigger,int polarity)727 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
728 				 int trigger, int polarity)
729 {
730 #ifdef CONFIG_PCI
731 	/*
732 	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
733 	 */
734 	if (trigger == ACPI_LEVEL_SENSITIVE)
735 		elcr_set_level_irq(gsi);
736 #endif
737 
738 	return gsi;
739 }
740 
741 #ifdef CONFIG_X86_LOCAL_APIC
acpi_register_gsi_ioapic(struct device * dev,u32 gsi,int trigger,int polarity)742 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
743 				    int trigger, int polarity)
744 {
745 	int irq = gsi;
746 #ifdef CONFIG_X86_IO_APIC
747 	int node;
748 	struct irq_alloc_info info;
749 
750 	node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
751 	trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
752 	polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
753 	ioapic_set_alloc_attr(&info, node, trigger, polarity);
754 
755 	mutex_lock(&acpi_ioapic_lock);
756 	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
757 	/* Don't set up the ACPI SCI because it's already set up */
758 	if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
759 		mp_config_acpi_gsi(dev, gsi, trigger, polarity);
760 	mutex_unlock(&acpi_ioapic_lock);
761 #endif
762 
763 	return irq;
764 }
765 
acpi_unregister_gsi_ioapic(u32 gsi)766 static void acpi_unregister_gsi_ioapic(u32 gsi)
767 {
768 #ifdef CONFIG_X86_IO_APIC
769 	int irq;
770 
771 	mutex_lock(&acpi_ioapic_lock);
772 	irq = mp_map_gsi_to_irq(gsi, 0, NULL);
773 	if (irq > 0)
774 		mp_unmap_irq(irq);
775 	mutex_unlock(&acpi_ioapic_lock);
776 #endif
777 }
778 #endif
779 
780 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
781 			   int trigger, int polarity) = acpi_register_gsi_pic;
782 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
783 
784 #ifdef CONFIG_ACPI_SLEEP
785 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
786 #else
787 int (*acpi_suspend_lowlevel)(void);
788 #endif
789 
790 /*
791  * success: return IRQ number (>=0)
792  * failure: return < 0
793  */
acpi_register_gsi(struct device * dev,u32 gsi,int trigger,int polarity)794 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
795 {
796 	return __acpi_register_gsi(dev, gsi, trigger, polarity);
797 }
798 EXPORT_SYMBOL_GPL(acpi_register_gsi);
799 
acpi_unregister_gsi(u32 gsi)800 void acpi_unregister_gsi(u32 gsi)
801 {
802 	if (__acpi_unregister_gsi)
803 		__acpi_unregister_gsi(gsi);
804 }
805 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
806 
807 #ifdef CONFIG_X86_LOCAL_APIC
acpi_set_irq_model_ioapic(void)808 static void __init acpi_set_irq_model_ioapic(void)
809 {
810 	acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
811 	__acpi_register_gsi = acpi_register_gsi_ioapic;
812 	__acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
813 	acpi_ioapic = 1;
814 }
815 #endif
816 
817 /*
818  *  ACPI based hotplug support for CPU
819  */
820 #ifdef CONFIG_ACPI_HOTPLUG_CPU
821 #include <acpi/processor.h>
822 
acpi_map_cpu2node(acpi_handle handle,int cpu,int physid)823 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
824 {
825 #ifdef CONFIG_ACPI_NUMA
826 	int nid;
827 
828 	nid = acpi_get_node(handle);
829 	if (nid != NUMA_NO_NODE) {
830 		set_apicid_to_node(physid, nid);
831 		numa_set_node(cpu, nid);
832 	}
833 #endif
834 	return 0;
835 }
836 
acpi_map_cpu(acpi_handle handle,phys_cpuid_t physid,u32 acpi_id,int * pcpu)837 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
838 		 int *pcpu)
839 {
840 	int cpu;
841 
842 	cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
843 	if (cpu < 0) {
844 		pr_info("Unable to map lapic to logical cpu number\n");
845 		return cpu;
846 	}
847 
848 	acpi_processor_set_pdc(handle);
849 	acpi_map_cpu2node(handle, cpu, physid);
850 
851 	*pcpu = cpu;
852 	return 0;
853 }
854 EXPORT_SYMBOL(acpi_map_cpu);
855 
acpi_unmap_cpu(int cpu)856 int acpi_unmap_cpu(int cpu)
857 {
858 #ifdef CONFIG_ACPI_NUMA
859 	set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
860 #endif
861 
862 	per_cpu(x86_cpu_to_apicid, cpu) = -1;
863 	set_cpu_present(cpu, false);
864 	num_processors--;
865 
866 	return (0);
867 }
868 EXPORT_SYMBOL(acpi_unmap_cpu);
869 #endif				/* CONFIG_ACPI_HOTPLUG_CPU */
870 
acpi_register_ioapic(acpi_handle handle,u64 phys_addr,u32 gsi_base)871 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
872 {
873 	int ret = -ENOSYS;
874 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
875 	int ioapic_id;
876 	u64 addr;
877 	struct ioapic_domain_cfg cfg = {
878 		.type = IOAPIC_DOMAIN_DYNAMIC,
879 		.ops = &mp_ioapic_irqdomain_ops,
880 	};
881 
882 	ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
883 	if (ioapic_id < 0) {
884 		unsigned long long uid;
885 		acpi_status status;
886 
887 		status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
888 					       NULL, &uid);
889 		if (ACPI_FAILURE(status)) {
890 			acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
891 			return -EINVAL;
892 		}
893 		ioapic_id = (int)uid;
894 	}
895 
896 	mutex_lock(&acpi_ioapic_lock);
897 	ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
898 	mutex_unlock(&acpi_ioapic_lock);
899 #endif
900 
901 	return ret;
902 }
903 EXPORT_SYMBOL(acpi_register_ioapic);
904 
acpi_unregister_ioapic(acpi_handle handle,u32 gsi_base)905 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
906 {
907 	int ret = -ENOSYS;
908 
909 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
910 	mutex_lock(&acpi_ioapic_lock);
911 	ret  = mp_unregister_ioapic(gsi_base);
912 	mutex_unlock(&acpi_ioapic_lock);
913 #endif
914 
915 	return ret;
916 }
917 EXPORT_SYMBOL(acpi_unregister_ioapic);
918 
919 /**
920  * acpi_ioapic_registered - Check whether IOAPIC associated with @gsi_base
921  *			    has been registered
922  * @handle:	ACPI handle of the IOAPIC device
923  * @gsi_base:	GSI base associated with the IOAPIC
924  *
925  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
926  * with acpi_register_ioapic()/acpi_unregister_ioapic().
927  */
acpi_ioapic_registered(acpi_handle handle,u32 gsi_base)928 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
929 {
930 	int ret = 0;
931 
932 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
933 	mutex_lock(&acpi_ioapic_lock);
934 	ret  = mp_ioapic_registered(gsi_base);
935 	mutex_unlock(&acpi_ioapic_lock);
936 #endif
937 
938 	return ret;
939 }
940 
acpi_parse_sbf(struct acpi_table_header * table)941 static int __init acpi_parse_sbf(struct acpi_table_header *table)
942 {
943 	struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
944 
945 	sbf_port = sb->cmos_index;	/* Save CMOS port */
946 
947 	return 0;
948 }
949 
950 #ifdef CONFIG_HPET_TIMER
951 #include <asm/hpet.h>
952 
953 static struct resource *hpet_res __initdata;
954 
acpi_parse_hpet(struct acpi_table_header * table)955 static int __init acpi_parse_hpet(struct acpi_table_header *table)
956 {
957 	struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
958 
959 	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
960 		pr_warn("HPET timers must be located in memory.\n");
961 		return -1;
962 	}
963 
964 	hpet_address = hpet_tbl->address.address;
965 	hpet_blockid = hpet_tbl->sequence;
966 
967 	/*
968 	 * Some broken BIOSes advertise HPET at 0x0. We really do not
969 	 * want to allocate a resource there.
970 	 */
971 	if (!hpet_address) {
972 		pr_warn("HPET id: %#x base: %#lx is invalid\n", hpet_tbl->id, hpet_address);
973 		return 0;
974 	}
975 #ifdef CONFIG_X86_64
976 	/*
977 	 * Some even more broken BIOSes advertise HPET at
978 	 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
979 	 * some noise:
980 	 */
981 	if (hpet_address == 0xfed0000000000000UL) {
982 		if (!hpet_force_user) {
983 			pr_warn("HPET id: %#x base: 0xfed0000000000000 is bogus, try hpet=force on the kernel command line to fix it up to 0xfed00000.\n",
984 				hpet_tbl->id);
985 			hpet_address = 0;
986 			return 0;
987 		}
988 		pr_warn("HPET id: %#x base: 0xfed0000000000000 fixed up to 0xfed00000.\n",
989 			hpet_tbl->id);
990 		hpet_address >>= 32;
991 	}
992 #endif
993 	pr_info("HPET id: %#x base: %#lx\n", hpet_tbl->id, hpet_address);
994 
995 	/*
996 	 * Allocate and initialize the HPET firmware resource for adding into
997 	 * the resource tree during the lateinit timeframe.
998 	 */
999 #define HPET_RESOURCE_NAME_SIZE 9
1000 	hpet_res = memblock_alloc(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE,
1001 				  SMP_CACHE_BYTES);
1002 	if (!hpet_res)
1003 		panic("%s: Failed to allocate %zu bytes\n", __func__,
1004 		      sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
1005 
1006 	hpet_res->name = (void *)&hpet_res[1];
1007 	hpet_res->flags = IORESOURCE_MEM;
1008 	snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
1009 		 hpet_tbl->sequence);
1010 
1011 	hpet_res->start = hpet_address;
1012 	hpet_res->end = hpet_address + (1 * 1024) - 1;
1013 
1014 	return 0;
1015 }
1016 
1017 /*
1018  * hpet_insert_resource inserts the HPET resources used into the resource
1019  * tree.
1020  */
hpet_insert_resource(void)1021 static __init int hpet_insert_resource(void)
1022 {
1023 	if (!hpet_res)
1024 		return 1;
1025 
1026 	return insert_resource(&iomem_resource, hpet_res);
1027 }
1028 
1029 late_initcall(hpet_insert_resource);
1030 
1031 #else
1032 #define	acpi_parse_hpet	NULL
1033 #endif
1034 
acpi_parse_fadt(struct acpi_table_header * table)1035 static int __init acpi_parse_fadt(struct acpi_table_header *table)
1036 {
1037 	if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
1038 		pr_debug("no legacy devices present\n");
1039 		x86_platform.legacy.devices.pnpbios = 0;
1040 	}
1041 
1042 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
1043 	    !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
1044 	    x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
1045 		pr_debug("i8042 controller is absent\n");
1046 		x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
1047 	}
1048 
1049 	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
1050 		pr_debug("not registering RTC platform device\n");
1051 		x86_platform.legacy.rtc = 0;
1052 	}
1053 
1054 	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
1055 		pr_debug("probing for VGA not safe\n");
1056 		x86_platform.legacy.no_vga = 1;
1057 	}
1058 
1059 #ifdef CONFIG_X86_PM_TIMER
1060 	/* detect the location of the ACPI PM Timer */
1061 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
1062 		/* FADT rev. 2 */
1063 		if (acpi_gbl_FADT.xpm_timer_block.space_id !=
1064 		    ACPI_ADR_SPACE_SYSTEM_IO)
1065 			return 0;
1066 
1067 		pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
1068 		/*
1069 		 * "X" fields are optional extensions to the original V1.0
1070 		 * fields, so we must selectively expand V1.0 fields if the
1071 		 * corresponding X field is zero.
1072 	 	 */
1073 		if (!pmtmr_ioport)
1074 			pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1075 	} else {
1076 		/* FADT rev. 1 */
1077 		pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1078 	}
1079 	if (pmtmr_ioport)
1080 		pr_info("PM-Timer IO Port: %#x\n", pmtmr_ioport);
1081 #endif
1082 	return 0;
1083 }
1084 
1085 #ifdef	CONFIG_X86_LOCAL_APIC
1086 /*
1087  * Parse LAPIC entries in MADT
1088  * returns 0 on success, < 0 on error
1089  */
1090 
early_acpi_parse_madt_lapic_addr_ovr(void)1091 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
1092 {
1093 	int count;
1094 
1095 	if (!boot_cpu_has(X86_FEATURE_APIC))
1096 		return -ENODEV;
1097 
1098 	/*
1099 	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1100 	 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1101 	 */
1102 
1103 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1104 				      acpi_parse_lapic_addr_ovr, 0);
1105 	if (count < 0) {
1106 		pr_err("Error parsing LAPIC address override entry\n");
1107 		return count;
1108 	}
1109 
1110 	register_lapic_address(acpi_lapic_addr);
1111 
1112 	return count;
1113 }
1114 
acpi_parse_madt_lapic_entries(void)1115 static int __init acpi_parse_madt_lapic_entries(void)
1116 {
1117 	int count;
1118 	int x2count = 0;
1119 	int ret;
1120 	struct acpi_subtable_proc madt_proc[2];
1121 
1122 	if (!boot_cpu_has(X86_FEATURE_APIC))
1123 		return -ENODEV;
1124 
1125 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1126 				      acpi_parse_sapic, MAX_LOCAL_APIC);
1127 
1128 	if (!count) {
1129 		memset(madt_proc, 0, sizeof(madt_proc));
1130 		madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1131 		madt_proc[0].handler = acpi_parse_lapic;
1132 		madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1133 		madt_proc[1].handler = acpi_parse_x2apic;
1134 		ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1135 				sizeof(struct acpi_table_madt),
1136 				madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1137 		if (ret < 0) {
1138 			pr_err("Error parsing LAPIC/X2APIC entries\n");
1139 			return ret;
1140 		}
1141 
1142 		count = madt_proc[0].count;
1143 		x2count = madt_proc[1].count;
1144 	}
1145 	if (!count && !x2count) {
1146 		pr_err("No LAPIC entries present\n");
1147 		/* TBD: Cleanup to allow fallback to MPS */
1148 		return -ENODEV;
1149 	} else if (count < 0 || x2count < 0) {
1150 		pr_err("Error parsing LAPIC entry\n");
1151 		/* TBD: Cleanup to allow fallback to MPS */
1152 		return count;
1153 	}
1154 
1155 	x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1156 					acpi_parse_x2apic_nmi, 0);
1157 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1158 				      acpi_parse_lapic_nmi, 0);
1159 	if (count < 0 || x2count < 0) {
1160 		pr_err("Error parsing LAPIC NMI entry\n");
1161 		/* TBD: Cleanup to allow fallback to MPS */
1162 		return count;
1163 	}
1164 	return 0;
1165 }
1166 
1167 #ifdef CONFIG_X86_64
acpi_parse_mp_wake(union acpi_subtable_headers * header,const unsigned long end)1168 static int __init acpi_parse_mp_wake(union acpi_subtable_headers *header,
1169 				     const unsigned long end)
1170 {
1171 	struct acpi_madt_multiproc_wakeup *mp_wake;
1172 
1173 	if (!IS_ENABLED(CONFIG_SMP))
1174 		return -ENODEV;
1175 
1176 	mp_wake = (struct acpi_madt_multiproc_wakeup *)header;
1177 	if (BAD_MADT_ENTRY(mp_wake, end))
1178 		return -EINVAL;
1179 
1180 	acpi_table_print_madt_entry(&header->common);
1181 
1182 	acpi_mp_wake_mailbox_paddr = mp_wake->base_address;
1183 
1184 	apic_update_callback(wakeup_secondary_cpu_64, acpi_wakeup_cpu);
1185 
1186 	return 0;
1187 }
1188 #endif				/* CONFIG_X86_64 */
1189 #endif				/* CONFIG_X86_LOCAL_APIC */
1190 
1191 #ifdef	CONFIG_X86_IO_APIC
mp_config_acpi_legacy_irqs(void)1192 static void __init mp_config_acpi_legacy_irqs(void)
1193 {
1194 	int i;
1195 	struct mpc_intsrc mp_irq;
1196 
1197 #ifdef CONFIG_EISA
1198 	/*
1199 	 * Fabricate the legacy ISA bus (bus #31).
1200 	 */
1201 	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1202 #endif
1203 	set_bit(MP_ISA_BUS, mp_bus_not_pci);
1204 	pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());
1205 
1206 	/*
1207 	 * Use the default configuration for the IRQs 0-15.  Unless
1208 	 * overridden by (MADT) interrupt source override entries.
1209 	 */
1210 	for (i = 0; i < nr_legacy_irqs(); i++) {
1211 		int ioapic, pin;
1212 		unsigned int dstapic;
1213 		int idx;
1214 		u32 gsi;
1215 
1216 		/* Locate the gsi that irq i maps to. */
1217 		if (acpi_isa_irq_to_gsi(i, &gsi))
1218 			continue;
1219 
1220 		/*
1221 		 * Locate the IOAPIC that manages the ISA IRQ.
1222 		 */
1223 		ioapic = mp_find_ioapic(gsi);
1224 		if (ioapic < 0)
1225 			continue;
1226 		pin = mp_find_ioapic_pin(ioapic, gsi);
1227 		dstapic = mpc_ioapic_id(ioapic);
1228 
1229 		for (idx = 0; idx < mp_irq_entries; idx++) {
1230 			struct mpc_intsrc *irq = mp_irqs + idx;
1231 
1232 			/* Do we already have a mapping for this ISA IRQ? */
1233 			if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1234 				break;
1235 
1236 			/* Do we already have a mapping for this IOAPIC pin */
1237 			if (irq->dstapic == dstapic && irq->dstirq == pin)
1238 				break;
1239 		}
1240 
1241 		if (idx != mp_irq_entries) {
1242 			pr_debug("ACPI: IRQ%d used by override.\n", i);
1243 			continue;	/* IRQ already used */
1244 		}
1245 
1246 		mp_irq.type = MP_INTSRC;
1247 		mp_irq.irqflag = 0;	/* Conforming */
1248 		mp_irq.srcbus = MP_ISA_BUS;
1249 		mp_irq.dstapic = dstapic;
1250 		mp_irq.irqtype = mp_INT;
1251 		mp_irq.srcbusirq = i; /* Identity mapped */
1252 		mp_irq.dstirq = pin;
1253 
1254 		mp_save_irq(&mp_irq);
1255 	}
1256 }
1257 
1258 /*
1259  * Parse IOAPIC related entries in MADT
1260  * returns 0 on success, < 0 on error
1261  */
acpi_parse_madt_ioapic_entries(void)1262 static int __init acpi_parse_madt_ioapic_entries(void)
1263 {
1264 	int count;
1265 
1266 	/*
1267 	 * ACPI interpreter is required to complete interrupt setup,
1268 	 * so if it is off, don't enumerate the io-apics with ACPI.
1269 	 * If MPS is present, it will handle them,
1270 	 * otherwise the system will stay in PIC mode
1271 	 */
1272 	if (acpi_disabled || acpi_noirq)
1273 		return -ENODEV;
1274 
1275 	if (!boot_cpu_has(X86_FEATURE_APIC))
1276 		return -ENODEV;
1277 
1278 	/*
1279 	 * if "noapic" boot option, don't look for IO-APICs
1280 	 */
1281 	if (ioapic_is_disabled) {
1282 		pr_info("Skipping IOAPIC probe due to 'noapic' option.\n");
1283 		return -ENODEV;
1284 	}
1285 
1286 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1287 				      MAX_IO_APICS);
1288 	if (!count) {
1289 		pr_err("No IOAPIC entries present\n");
1290 		return -ENODEV;
1291 	} else if (count < 0) {
1292 		pr_err("Error parsing IOAPIC entry\n");
1293 		return count;
1294 	}
1295 
1296 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1297 				      acpi_parse_int_src_ovr, nr_irqs);
1298 	if (count < 0) {
1299 		pr_err("Error parsing interrupt source overrides entry\n");
1300 		/* TBD: Cleanup to allow fallback to MPS */
1301 		return count;
1302 	}
1303 
1304 	/*
1305 	 * If BIOS did not supply an INT_SRC_OVR for the SCI
1306 	 * pretend we got one so we can set the SCI flags.
1307 	 * But ignore setting up SCI on hardware reduced platforms.
1308 	 */
1309 	if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
1310 		acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1311 				      acpi_gbl_FADT.sci_interrupt);
1312 
1313 	/* Fill in identity legacy mappings where no override */
1314 	mp_config_acpi_legacy_irqs();
1315 
1316 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1317 				      acpi_parse_nmi_src, nr_irqs);
1318 	if (count < 0) {
1319 		pr_err("Error parsing NMI SRC entry\n");
1320 		/* TBD: Cleanup to allow fallback to MPS */
1321 		return count;
1322 	}
1323 
1324 	return 0;
1325 }
1326 #else
acpi_parse_madt_ioapic_entries(void)1327 static inline int acpi_parse_madt_ioapic_entries(void)
1328 {
1329 	return -1;
1330 }
1331 #endif	/* !CONFIG_X86_IO_APIC */
1332 
early_acpi_process_madt(void)1333 static void __init early_acpi_process_madt(void)
1334 {
1335 #ifdef CONFIG_X86_LOCAL_APIC
1336 	int error;
1337 
1338 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1339 
1340 		/*
1341 		 * Parse MADT LAPIC entries
1342 		 */
1343 		error = early_acpi_parse_madt_lapic_addr_ovr();
1344 		if (!error) {
1345 			acpi_lapic = 1;
1346 			smp_found_config = 1;
1347 		}
1348 		if (error == -EINVAL) {
1349 			/*
1350 			 * Dell Precision Workstation 410, 610 come here.
1351 			 */
1352 			pr_err("Invalid BIOS MADT, disabling ACPI\n");
1353 			disable_acpi();
1354 		}
1355 	}
1356 #endif
1357 }
1358 
acpi_process_madt(void)1359 static void __init acpi_process_madt(void)
1360 {
1361 #ifdef CONFIG_X86_LOCAL_APIC
1362 	int error;
1363 
1364 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1365 
1366 		/*
1367 		 * Parse MADT LAPIC entries
1368 		 */
1369 		error = acpi_parse_madt_lapic_entries();
1370 		if (!error) {
1371 			acpi_lapic = 1;
1372 
1373 			/*
1374 			 * Parse MADT IO-APIC entries
1375 			 */
1376 			mutex_lock(&acpi_ioapic_lock);
1377 			error = acpi_parse_madt_ioapic_entries();
1378 			mutex_unlock(&acpi_ioapic_lock);
1379 			if (!error) {
1380 				acpi_set_irq_model_ioapic();
1381 
1382 				smp_found_config = 1;
1383 			}
1384 
1385 #ifdef CONFIG_X86_64
1386 			/*
1387 			 * Parse MADT MP Wake entry.
1388 			 */
1389 			acpi_table_parse_madt(ACPI_MADT_TYPE_MULTIPROC_WAKEUP,
1390 					      acpi_parse_mp_wake, 1);
1391 #endif
1392 		}
1393 		if (error == -EINVAL) {
1394 			/*
1395 			 * Dell Precision Workstation 410, 610 come here.
1396 			 */
1397 			pr_err("Invalid BIOS MADT, disabling ACPI\n");
1398 			disable_acpi();
1399 		}
1400 	} else {
1401 		/*
1402  		 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1403  		 * In the event an MPS table was found, forget it.
1404  		 * Boot with "acpi=off" to use MPS on such a system.
1405  		 */
1406 		if (smp_found_config) {
1407 			pr_warn("No APIC-table, disabling MPS\n");
1408 			smp_found_config = 0;
1409 		}
1410 	}
1411 
1412 	/*
1413 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1414 	 * processors, where MPS only supports physical.
1415 	 */
1416 	if (acpi_lapic && acpi_ioapic)
1417 		pr_info("Using ACPI (MADT) for SMP configuration information\n");
1418 	else if (acpi_lapic)
1419 		pr_info("Using ACPI for processor (LAPIC) configuration information\n");
1420 #endif
1421 	return;
1422 }
1423 
disable_acpi_irq(const struct dmi_system_id * d)1424 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1425 {
1426 	if (!acpi_force) {
1427 		pr_notice("%s detected: force use of acpi=noirq\n", d->ident);
1428 		acpi_noirq_set();
1429 	}
1430 	return 0;
1431 }
1432 
disable_acpi_pci(const struct dmi_system_id * d)1433 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1434 {
1435 	if (!acpi_force) {
1436 		pr_notice("%s detected: force use of pci=noacpi\n", d->ident);
1437 		acpi_disable_pci();
1438 	}
1439 	return 0;
1440 }
1441 
disable_acpi_xsdt(const struct dmi_system_id * d)1442 static int __init disable_acpi_xsdt(const struct dmi_system_id *d)
1443 {
1444 	if (!acpi_force) {
1445 		pr_notice("%s detected: force use of acpi=rsdt\n", d->ident);
1446 		acpi_gbl_do_not_use_xsdt = TRUE;
1447 	} else {
1448 		pr_notice("Warning: DMI blacklist says broken, but acpi XSDT forced\n");
1449 	}
1450 	return 0;
1451 }
1452 
dmi_disable_acpi(const struct dmi_system_id * d)1453 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1454 {
1455 	if (!acpi_force) {
1456 		pr_notice("%s detected: acpi off\n", d->ident);
1457 		disable_acpi();
1458 	} else {
1459 		pr_notice("Warning: DMI blacklist says broken, but acpi forced\n");
1460 	}
1461 	return 0;
1462 }
1463 
1464 /*
1465  * Force ignoring BIOS IRQ0 override
1466  */
dmi_ignore_irq0_timer_override(const struct dmi_system_id * d)1467 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1468 {
1469 	if (!acpi_skip_timer_override) {
1470 		pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1471 			d->ident);
1472 		acpi_skip_timer_override = 1;
1473 	}
1474 	return 0;
1475 }
1476 
1477 /*
1478  * ACPI offers an alternative platform interface model that removes
1479  * ACPI hardware requirements for platforms that do not implement
1480  * the PC Architecture.
1481  *
1482  * We initialize the Hardware-reduced ACPI model here:
1483  */
acpi_generic_reduced_hw_init(void)1484 void __init acpi_generic_reduced_hw_init(void)
1485 {
1486 	/*
1487 	 * Override x86_init functions and bypass legacy PIC in
1488 	 * hardware reduced ACPI mode.
1489 	 */
1490 	x86_init.timers.timer_init	= x86_init_noop;
1491 	x86_init.irqs.pre_vector_init	= x86_init_noop;
1492 	legacy_pic			= &null_legacy_pic;
1493 }
1494 
acpi_reduced_hw_init(void)1495 static void __init acpi_reduced_hw_init(void)
1496 {
1497 	if (acpi_gbl_reduced_hardware)
1498 		x86_init.acpi.reduced_hw_early_init();
1499 }
1500 
1501 /*
1502  * If your system is blacklisted here, but you find that acpi=force
1503  * works for you, please contact linux-acpi@vger.kernel.org
1504  */
1505 static const struct dmi_system_id acpi_dmi_table[] __initconst = {
1506 	/*
1507 	 * Boxes that need ACPI disabled
1508 	 */
1509 	{
1510 	 .callback = dmi_disable_acpi,
1511 	 .ident = "IBM Thinkpad",
1512 	 .matches = {
1513 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1514 		     DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1515 		     },
1516 	 },
1517 
1518 	/*
1519 	 * Boxes that need ACPI PCI IRQ routing disabled
1520 	 */
1521 	{
1522 	 .callback = disable_acpi_irq,
1523 	 .ident = "ASUS A7V",
1524 	 .matches = {
1525 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1526 		     DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1527 		     /* newer BIOS, Revision 1011, does work */
1528 		     DMI_MATCH(DMI_BIOS_VERSION,
1529 			       "ASUS A7V ACPI BIOS Revision 1007"),
1530 		     },
1531 	 },
1532 	{
1533 		/*
1534 		 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1535 		 * for LPC bridge, which is needed for the PCI
1536 		 * interrupt links to work. DSDT fix is in bug 5966.
1537 		 * 2645, 2646 model numbers are shared with 600/600E/600X
1538 		 */
1539 	 .callback = disable_acpi_irq,
1540 	 .ident = "IBM Thinkpad 600 Series 2645",
1541 	 .matches = {
1542 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1543 		     DMI_MATCH(DMI_BOARD_NAME, "2645"),
1544 		     },
1545 	 },
1546 	{
1547 	 .callback = disable_acpi_irq,
1548 	 .ident = "IBM Thinkpad 600 Series 2646",
1549 	 .matches = {
1550 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1551 		     DMI_MATCH(DMI_BOARD_NAME, "2646"),
1552 		     },
1553 	 },
1554 	/*
1555 	 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1556 	 */
1557 	{			/* _BBN 0 bug */
1558 	 .callback = disable_acpi_pci,
1559 	 .ident = "ASUS PR-DLS",
1560 	 .matches = {
1561 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1562 		     DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1563 		     DMI_MATCH(DMI_BIOS_VERSION,
1564 			       "ASUS PR-DLS ACPI BIOS Revision 1010"),
1565 		     DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1566 		     },
1567 	 },
1568 	{
1569 	 .callback = disable_acpi_pci,
1570 	 .ident = "Acer TravelMate 36x Laptop",
1571 	 .matches = {
1572 		     DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1573 		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1574 		     },
1575 	 },
1576 	/*
1577 	 * Boxes that need ACPI XSDT use disabled due to corrupted tables
1578 	 */
1579 	{
1580 	 .callback = disable_acpi_xsdt,
1581 	 .ident = "Advantech DAC-BJ01",
1582 	 .matches = {
1583 		     DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1584 		     DMI_MATCH(DMI_PRODUCT_NAME, "Bearlake CRB Board"),
1585 		     DMI_MATCH(DMI_BIOS_VERSION, "V1.12"),
1586 		     DMI_MATCH(DMI_BIOS_DATE, "02/01/2011"),
1587 		     },
1588 	 },
1589 	{}
1590 };
1591 
1592 /* second table for DMI checks that should run after early-quirks */
1593 static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
1594 	/*
1595 	 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1596 	 * which includes some code which overrides all temperature
1597 	 * trip points to 16C if the INTIN2 input of the I/O APIC
1598 	 * is enabled.  This input is incorrectly designated the
1599 	 * ISA IRQ 0 via an interrupt source override even though
1600 	 * it is wired to the output of the master 8259A and INTIN0
1601 	 * is not connected at all.  Force ignoring BIOS IRQ0
1602 	 * override in that cases.
1603 	 */
1604 	{
1605 	 .callback = dmi_ignore_irq0_timer_override,
1606 	 .ident = "HP nx6115 laptop",
1607 	 .matches = {
1608 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1609 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1610 		     },
1611 	 },
1612 	{
1613 	 .callback = dmi_ignore_irq0_timer_override,
1614 	 .ident = "HP NX6125 laptop",
1615 	 .matches = {
1616 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1617 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1618 		     },
1619 	 },
1620 	{
1621 	 .callback = dmi_ignore_irq0_timer_override,
1622 	 .ident = "HP NX6325 laptop",
1623 	 .matches = {
1624 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1625 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1626 		     },
1627 	 },
1628 	{
1629 	 .callback = dmi_ignore_irq0_timer_override,
1630 	 .ident = "HP 6715b laptop",
1631 	 .matches = {
1632 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1633 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1634 		     },
1635 	 },
1636 	{
1637 	 .callback = dmi_ignore_irq0_timer_override,
1638 	 .ident = "FUJITSU SIEMENS",
1639 	 .matches = {
1640 		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1641 		     DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1642 		     },
1643 	 },
1644 	{}
1645 };
1646 
1647 /*
1648  * acpi_boot_table_init() and acpi_boot_init()
1649  *  called from setup_arch(), always.
1650  *	1. checksums all tables
1651  *	2. enumerates lapics
1652  *	3. enumerates io-apics
1653  *
1654  * acpi_table_init() is separate to allow reading SRAT without
1655  * other side effects.
1656  *
1657  * side effects of acpi_boot_init:
1658  *	acpi_lapic = 1 if LAPIC found
1659  *	acpi_ioapic = 1 if IOAPIC found
1660  *	if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1661  *	if acpi_blacklisted() acpi_disabled = 1;
1662  *	acpi_irq_model=...
1663  *	...
1664  */
1665 
acpi_boot_table_init(void)1666 void __init acpi_boot_table_init(void)
1667 {
1668 	dmi_check_system(acpi_dmi_table);
1669 
1670 	/*
1671 	 * If acpi_disabled, bail out
1672 	 */
1673 	if (acpi_disabled)
1674 		return;
1675 
1676 	/*
1677 	 * Initialize the ACPI boot-time table parser.
1678 	 */
1679 	if (acpi_locate_initial_tables())
1680 		disable_acpi();
1681 	else
1682 		acpi_reserve_initial_tables();
1683 }
1684 
early_acpi_boot_init(void)1685 int __init early_acpi_boot_init(void)
1686 {
1687 	if (acpi_disabled)
1688 		return 1;
1689 
1690 	acpi_table_init_complete();
1691 
1692 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1693 
1694 	/*
1695 	 * blacklist may disable ACPI entirely
1696 	 */
1697 	if (acpi_blacklisted()) {
1698 		if (acpi_force) {
1699 			pr_warn("acpi=force override\n");
1700 		} else {
1701 			pr_warn("Disabling ACPI support\n");
1702 			disable_acpi();
1703 			return 1;
1704 		}
1705 	}
1706 
1707 	/*
1708 	 * Process the Multiple APIC Description Table (MADT), if present
1709 	 */
1710 	early_acpi_process_madt();
1711 
1712 	/*
1713 	 * Hardware-reduced ACPI mode initialization:
1714 	 */
1715 	acpi_reduced_hw_init();
1716 
1717 	return 0;
1718 }
1719 
acpi_boot_init(void)1720 int __init acpi_boot_init(void)
1721 {
1722 	/* those are executed after early-quirks are executed */
1723 	dmi_check_system(acpi_dmi_table_late);
1724 
1725 	/*
1726 	 * If acpi_disabled, bail out
1727 	 */
1728 	if (acpi_disabled)
1729 		return 1;
1730 
1731 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1732 
1733 	/*
1734 	 * set sci_int and PM timer address
1735 	 */
1736 	acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1737 
1738 	/*
1739 	 * Process the Multiple APIC Description Table (MADT), if present
1740 	 */
1741 	acpi_process_madt();
1742 
1743 	acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1744 	if (IS_ENABLED(CONFIG_ACPI_BGRT) && !acpi_nobgrt)
1745 		acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1746 
1747 	if (!acpi_noirq)
1748 		x86_init.pci.init = pci_acpi_init;
1749 
1750 	/* Do not enable ACPI SPCR console by default */
1751 	acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
1752 	return 0;
1753 }
1754 
parse_acpi(char * arg)1755 static int __init parse_acpi(char *arg)
1756 {
1757 	if (!arg)
1758 		return -EINVAL;
1759 
1760 	/* "acpi=off" disables both ACPI table parsing and interpreter */
1761 	if (strcmp(arg, "off") == 0) {
1762 		disable_acpi();
1763 	}
1764 	/* acpi=force to over-ride black-list */
1765 	else if (strcmp(arg, "force") == 0) {
1766 		acpi_force = 1;
1767 		acpi_disabled = 0;
1768 	}
1769 	/* acpi=strict disables out-of-spec workarounds */
1770 	else if (strcmp(arg, "strict") == 0) {
1771 		acpi_strict = 1;
1772 	}
1773 	/* acpi=rsdt use RSDT instead of XSDT */
1774 	else if (strcmp(arg, "rsdt") == 0) {
1775 		acpi_gbl_do_not_use_xsdt = TRUE;
1776 	}
1777 	/* "acpi=noirq" disables ACPI interrupt routing */
1778 	else if (strcmp(arg, "noirq") == 0) {
1779 		acpi_noirq_set();
1780 	}
1781 	/* "acpi=copy_dsdt" copies DSDT */
1782 	else if (strcmp(arg, "copy_dsdt") == 0) {
1783 		acpi_gbl_copy_dsdt_locally = 1;
1784 	}
1785 	/* "acpi=nocmcff" disables FF mode for corrected errors */
1786 	else if (strcmp(arg, "nocmcff") == 0) {
1787 		acpi_disable_cmcff = 1;
1788 	} else {
1789 		/* Core will printk when we return error. */
1790 		return -EINVAL;
1791 	}
1792 	return 0;
1793 }
1794 early_param("acpi", parse_acpi);
1795 
parse_acpi_bgrt(char * arg)1796 static int __init parse_acpi_bgrt(char *arg)
1797 {
1798 	acpi_nobgrt = true;
1799 	return 0;
1800 }
1801 early_param("bgrt_disable", parse_acpi_bgrt);
1802 
1803 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
parse_pci(char * arg)1804 static int __init parse_pci(char *arg)
1805 {
1806 	if (arg && strcmp(arg, "noacpi") == 0)
1807 		acpi_disable_pci();
1808 	return 0;
1809 }
1810 early_param("pci", parse_pci);
1811 
acpi_mps_check(void)1812 int __init acpi_mps_check(void)
1813 {
1814 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1815 /* mptable code is not built-in*/
1816 	if (acpi_disabled || acpi_noirq) {
1817 		pr_warn("MPS support code is not built-in, using acpi=off or acpi=noirq or pci=noacpi may have problem\n");
1818 		return 1;
1819 	}
1820 #endif
1821 	return 0;
1822 }
1823 
1824 #ifdef CONFIG_X86_IO_APIC
parse_acpi_skip_timer_override(char * arg)1825 static int __init parse_acpi_skip_timer_override(char *arg)
1826 {
1827 	acpi_skip_timer_override = 1;
1828 	return 0;
1829 }
1830 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1831 
parse_acpi_use_timer_override(char * arg)1832 static int __init parse_acpi_use_timer_override(char *arg)
1833 {
1834 	acpi_use_timer_override = 1;
1835 	return 0;
1836 }
1837 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1838 #endif /* CONFIG_X86_IO_APIC */
1839 
setup_acpi_sci(char * s)1840 static int __init setup_acpi_sci(char *s)
1841 {
1842 	if (!s)
1843 		return -EINVAL;
1844 	if (!strcmp(s, "edge"))
1845 		acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1846 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1847 	else if (!strcmp(s, "level"))
1848 		acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1849 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1850 	else if (!strcmp(s, "high"))
1851 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1852 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1853 	else if (!strcmp(s, "low"))
1854 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1855 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1856 	else
1857 		return -EINVAL;
1858 	return 0;
1859 }
1860 early_param("acpi_sci", setup_acpi_sci);
1861 
__acpi_acquire_global_lock(unsigned int * lock)1862 int __acpi_acquire_global_lock(unsigned int *lock)
1863 {
1864 	unsigned int old, new, val;
1865 
1866 	old = READ_ONCE(*lock);
1867 	do {
1868 		val = (old >> 1) & 0x1;
1869 		new = (old & ~0x3) + 2 + val;
1870 	} while (!try_cmpxchg(lock, &old, new));
1871 
1872 	if (val)
1873 		return 0;
1874 
1875 	return -1;
1876 }
1877 
__acpi_release_global_lock(unsigned int * lock)1878 int __acpi_release_global_lock(unsigned int *lock)
1879 {
1880 	unsigned int old, new;
1881 
1882 	old = READ_ONCE(*lock);
1883 	do {
1884 		new = old & ~0x3;
1885 	} while (!try_cmpxchg(lock, &old, new));
1886 	return old & 0x1;
1887 }
1888 
arch_reserve_mem_area(acpi_physical_address addr,size_t size)1889 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1890 {
1891 	e820__range_add(addr, size, E820_TYPE_NVS);
1892 	e820__update_table_print();
1893 }
1894 
x86_default_set_root_pointer(u64 addr)1895 void x86_default_set_root_pointer(u64 addr)
1896 {
1897 	boot_params.acpi_rsdp_addr = addr;
1898 }
1899 
x86_default_get_root_pointer(void)1900 u64 x86_default_get_root_pointer(void)
1901 {
1902 	return boot_params.acpi_rsdp_addr;
1903 }
1904