• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
9 #include <linux/init.h>
10 #include <linux/acpi.h>
11 #include <linux/acpi_pmtmr.h>
12 #include <linux/efi.h>
13 #include <linux/cpumask.h>
14 #include <linux/export.h>
15 #include <linux/dmi.h>
16 #include <linux/irq.h>
17 #include <linux/slab.h>
18 #include <linux/memblock.h>
19 #include <linux/ioport.h>
20 #include <linux/pci.h>
21 #include <linux/efi-bgrt.h>
22 #include <linux/serial_core.h>
23 
24 #include <asm/e820/api.h>
25 #include <asm/irqdomain.h>
26 #include <asm/pci_x86.h>
27 #include <asm/pgtable.h>
28 #include <asm/io_apic.h>
29 #include <asm/apic.h>
30 #include <asm/io.h>
31 #include <asm/mpspec.h>
32 #include <asm/smp.h>
33 #include <asm/i8259.h>
34 #include <asm/setup.h>
35 
36 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
37 static int __initdata acpi_force = 0;
38 int acpi_disabled;
39 EXPORT_SYMBOL(acpi_disabled);
40 
41 #ifdef	CONFIG_X86_64
42 # include <asm/proto.h>
43 #endif				/* X86 */
44 
45 #define PREFIX			"ACPI: "
46 
47 int acpi_noirq;				/* skip ACPI IRQ initialization */
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 #endif
66 
67 #ifdef CONFIG_X86_IO_APIC
68 /*
69  * Locks related to IOAPIC hotplug
70  * Hotplug side:
71  *	->device_hotplug_lock
72  *		->acpi_ioapic_lock
73  *			->ioapic_lock
74  * Interrupt mapping side:
75  *	->acpi_ioapic_lock
76  *		->ioapic_mutex
77  *			->ioapic_lock
78  */
79 static DEFINE_MUTEX(acpi_ioapic_lock);
80 #endif
81 
82 /* --------------------------------------------------------------------------
83                               Boot-time Configuration
84    -------------------------------------------------------------------------- */
85 
86 /*
87  * The default interrupt routing model is PIC (8259).  This gets
88  * overridden if IOAPICs are enumerated (below).
89  */
90 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
91 
92 
93 /*
94  * ISA irqs by default are the first 16 gsis but can be
95  * any gsi as specified by an interrupt source override.
96  */
97 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
98 	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
99 };
100 
101 /*
102  * This is just a simple wrapper around early_memremap(),
103  * with sanity checks for phys == 0 and size == 0.
104  */
__acpi_map_table(unsigned long phys,unsigned long size)105 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
106 {
107 
108 	if (!phys || !size)
109 		return NULL;
110 
111 	return early_memremap(phys, size);
112 }
113 
__acpi_unmap_table(void __iomem * map,unsigned long size)114 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
115 {
116 	if (!map || !size)
117 		return;
118 
119 	early_memunmap(map, size);
120 }
121 
122 #ifdef CONFIG_X86_LOCAL_APIC
acpi_parse_madt(struct acpi_table_header * table)123 static int __init acpi_parse_madt(struct acpi_table_header *table)
124 {
125 	struct acpi_table_madt *madt = NULL;
126 
127 	if (!boot_cpu_has(X86_FEATURE_APIC))
128 		return -EINVAL;
129 
130 	madt = (struct acpi_table_madt *)table;
131 	if (!madt) {
132 		printk(KERN_WARNING PREFIX "Unable to map MADT\n");
133 		return -ENODEV;
134 	}
135 
136 	if (madt->address) {
137 		acpi_lapic_addr = (u64) madt->address;
138 
139 		printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
140 		       madt->address);
141 	}
142 
143 	if (madt->flags & ACPI_MADT_PCAT_COMPAT)
144 		legacy_pic_pcat_compat();
145 
146 	default_acpi_madt_oem_check(madt->header.oem_id,
147 				    madt->header.oem_table_id);
148 
149 	return 0;
150 }
151 
152 /**
153  * acpi_register_lapic - register a local apic and generates a logic cpu number
154  * @id: local apic id to register
155  * @acpiid: ACPI id to register
156  * @enabled: this cpu is enabled or not
157  *
158  * Returns the logic cpu number which maps to the local apic
159  */
acpi_register_lapic(int id,u32 acpiid,u8 enabled)160 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
161 {
162 	unsigned int ver = 0;
163 	int cpu;
164 
165 	if (id >= MAX_LOCAL_APIC) {
166 		printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
167 		return -EINVAL;
168 	}
169 
170 	if (!enabled) {
171 		++disabled_cpus;
172 		return -EINVAL;
173 	}
174 
175 	if (boot_cpu_physical_apicid != -1U)
176 		ver = boot_cpu_apic_version;
177 
178 	cpu = generic_processor_info(id, ver);
179 	if (cpu >= 0)
180 		early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
181 
182 	return cpu;
183 }
184 
185 static int __init
acpi_parse_x2apic(union acpi_subtable_headers * header,const unsigned long end)186 acpi_parse_x2apic(union acpi_subtable_headers *header, const unsigned long end)
187 {
188 	struct acpi_madt_local_x2apic *processor = NULL;
189 #ifdef CONFIG_X86_X2APIC
190 	u32 apic_id;
191 	u8 enabled;
192 #endif
193 
194 	processor = (struct acpi_madt_local_x2apic *)header;
195 
196 	if (BAD_MADT_ENTRY(processor, end))
197 		return -EINVAL;
198 
199 	acpi_table_print_madt_entry(&header->common);
200 
201 #ifdef CONFIG_X86_X2APIC
202 	apic_id = processor->local_apic_id;
203 	enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
204 
205 	/* Ignore invalid ID */
206 	if (apic_id == 0xffffffff)
207 		return 0;
208 
209 	/*
210 	 * We need to register disabled CPU as well to permit
211 	 * counting disabled CPUs. This allows us to size
212 	 * cpus_possible_map more accurately, to permit
213 	 * to not preallocating memory for all NR_CPUS
214 	 * when we use CPU hotplug.
215 	 */
216 	if (!apic->apic_id_valid(apic_id)) {
217 		if (enabled)
218 			pr_warn(PREFIX "x2apic entry ignored\n");
219 		return 0;
220 	}
221 
222 	acpi_register_lapic(apic_id, processor->uid, enabled);
223 #else
224 	printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
225 #endif
226 
227 	return 0;
228 }
229 
230 static int __init
acpi_parse_lapic(union acpi_subtable_headers * header,const unsigned long end)231 acpi_parse_lapic(union acpi_subtable_headers * header, const unsigned long end)
232 {
233 	struct acpi_madt_local_apic *processor = NULL;
234 
235 	processor = (struct acpi_madt_local_apic *)header;
236 
237 	if (BAD_MADT_ENTRY(processor, end))
238 		return -EINVAL;
239 
240 	acpi_table_print_madt_entry(&header->common);
241 
242 	/* Ignore invalid ID */
243 	if (processor->id == 0xff)
244 		return 0;
245 
246 	/*
247 	 * We need to register disabled CPU as well to permit
248 	 * counting disabled CPUs. This allows us to size
249 	 * cpus_possible_map more accurately, to permit
250 	 * to not preallocating memory for all NR_CPUS
251 	 * when we use CPU hotplug.
252 	 */
253 	acpi_register_lapic(processor->id,	/* APIC ID */
254 			    processor->processor_id, /* ACPI ID */
255 			    processor->lapic_flags & ACPI_MADT_ENABLED);
256 
257 	return 0;
258 }
259 
260 static int __init
acpi_parse_sapic(union acpi_subtable_headers * header,const unsigned long end)261 acpi_parse_sapic(union acpi_subtable_headers *header, const unsigned long end)
262 {
263 	struct acpi_madt_local_sapic *processor = NULL;
264 
265 	processor = (struct acpi_madt_local_sapic *)header;
266 
267 	if (BAD_MADT_ENTRY(processor, end))
268 		return -EINVAL;
269 
270 	acpi_table_print_madt_entry(&header->common);
271 
272 	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
273 			    processor->processor_id, /* ACPI ID */
274 			    processor->lapic_flags & ACPI_MADT_ENABLED);
275 
276 	return 0;
277 }
278 
279 static int __init
acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,const unsigned long end)280 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
281 			  const unsigned long end)
282 {
283 	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
284 
285 	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
286 
287 	if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
288 		return -EINVAL;
289 
290 	acpi_table_print_madt_entry(&header->common);
291 
292 	acpi_lapic_addr = lapic_addr_ovr->address;
293 
294 	return 0;
295 }
296 
297 static int __init
acpi_parse_x2apic_nmi(union acpi_subtable_headers * header,const unsigned long end)298 acpi_parse_x2apic_nmi(union acpi_subtable_headers *header,
299 		      const unsigned long end)
300 {
301 	struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
302 
303 	x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
304 
305 	if (BAD_MADT_ENTRY(x2apic_nmi, end))
306 		return -EINVAL;
307 
308 	acpi_table_print_madt_entry(&header->common);
309 
310 	if (x2apic_nmi->lint != 1)
311 		printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
312 
313 	return 0;
314 }
315 
316 static int __init
acpi_parse_lapic_nmi(union acpi_subtable_headers * header,const unsigned long end)317 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
318 {
319 	struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
320 
321 	lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
322 
323 	if (BAD_MADT_ENTRY(lapic_nmi, end))
324 		return -EINVAL;
325 
326 	acpi_table_print_madt_entry(&header->common);
327 
328 	if (lapic_nmi->lint != 1)
329 		printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
330 
331 	return 0;
332 }
333 
334 #endif				/*CONFIG_X86_LOCAL_APIC */
335 
336 #ifdef CONFIG_X86_IO_APIC
337 #define MP_ISA_BUS		0
338 
339 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
340 						u8 trigger, u32 gsi);
341 
mp_override_legacy_irq(u8 bus_irq,u8 polarity,u8 trigger,u32 gsi)342 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
343 					  u32 gsi)
344 {
345 	/*
346 	 * Check bus_irq boundary.
347 	 */
348 	if (bus_irq >= NR_IRQS_LEGACY) {
349 		pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
350 		return;
351 	}
352 
353 	/*
354 	 * TBD: This check is for faulty timer entries, where the override
355 	 *      erroneously sets the trigger to level, resulting in a HUGE
356 	 *      increase of timer interrupts!
357 	 */
358 	if ((bus_irq == 0) && (trigger == 3))
359 		trigger = 1;
360 
361 	if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
362 		return;
363 	/*
364 	 * Reset default identity mapping if gsi is also an legacy IRQ,
365 	 * otherwise there will be more than one entry with the same GSI
366 	 * and acpi_isa_irq_to_gsi() may give wrong result.
367 	 */
368 	if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
369 		isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
370 	isa_irq_to_gsi[bus_irq] = gsi;
371 }
372 
mp_config_acpi_gsi(struct device * dev,u32 gsi,int trigger,int polarity)373 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
374 			int polarity)
375 {
376 #ifdef CONFIG_X86_MPPARSE
377 	struct mpc_intsrc mp_irq;
378 	struct pci_dev *pdev;
379 	unsigned char number;
380 	unsigned int devfn;
381 	int ioapic;
382 	u8 pin;
383 
384 	if (!acpi_ioapic)
385 		return 0;
386 	if (!dev || !dev_is_pci(dev))
387 		return 0;
388 
389 	pdev = to_pci_dev(dev);
390 	number = pdev->bus->number;
391 	devfn = pdev->devfn;
392 	pin = pdev->pin;
393 	/* print the entry should happen on mptable identically */
394 	mp_irq.type = MP_INTSRC;
395 	mp_irq.irqtype = mp_INT;
396 	mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
397 				(polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
398 	mp_irq.srcbus = number;
399 	mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
400 	ioapic = mp_find_ioapic(gsi);
401 	mp_irq.dstapic = mpc_ioapic_id(ioapic);
402 	mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
403 
404 	mp_save_irq(&mp_irq);
405 #endif
406 	return 0;
407 }
408 
mp_register_ioapic_irq(u8 bus_irq,u8 polarity,u8 trigger,u32 gsi)409 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
410 						u8 trigger, u32 gsi)
411 {
412 	struct mpc_intsrc mp_irq;
413 	int ioapic, pin;
414 
415 	/* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
416 	ioapic = mp_find_ioapic(gsi);
417 	if (ioapic < 0) {
418 		pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
419 		return ioapic;
420 	}
421 
422 	pin = mp_find_ioapic_pin(ioapic, gsi);
423 
424 	mp_irq.type = MP_INTSRC;
425 	mp_irq.irqtype = mp_INT;
426 	mp_irq.irqflag = (trigger << 2) | polarity;
427 	mp_irq.srcbus = MP_ISA_BUS;
428 	mp_irq.srcbusirq = bus_irq;
429 	mp_irq.dstapic = mpc_ioapic_id(ioapic);
430 	mp_irq.dstirq = pin;
431 
432 	mp_save_irq(&mp_irq);
433 
434 	return 0;
435 }
436 
437 static int __init
acpi_parse_ioapic(union acpi_subtable_headers * header,const unsigned long end)438 acpi_parse_ioapic(union acpi_subtable_headers * header, const unsigned long end)
439 {
440 	struct acpi_madt_io_apic *ioapic = NULL;
441 	struct ioapic_domain_cfg cfg = {
442 		.type = IOAPIC_DOMAIN_DYNAMIC,
443 		.ops = &mp_ioapic_irqdomain_ops,
444 	};
445 
446 	ioapic = (struct acpi_madt_io_apic *)header;
447 
448 	if (BAD_MADT_ENTRY(ioapic, end))
449 		return -EINVAL;
450 
451 	acpi_table_print_madt_entry(&header->common);
452 
453 	/* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
454 	if (ioapic->global_irq_base < nr_legacy_irqs())
455 		cfg.type = IOAPIC_DOMAIN_LEGACY;
456 
457 	mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
458 			   &cfg);
459 
460 	return 0;
461 }
462 
463 /*
464  * Parse Interrupt Source Override for the ACPI SCI
465  */
acpi_sci_ioapic_setup(u8 bus_irq,u16 polarity,u16 trigger,u32 gsi)466 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
467 {
468 	if (trigger == 0)	/* compatible SCI trigger is level */
469 		trigger = 3;
470 
471 	if (polarity == 0)	/* compatible SCI polarity is low */
472 		polarity = 3;
473 
474 	/* Command-line over-ride via acpi_sci= */
475 	if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
476 		trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
477 
478 	if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
479 		polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
480 
481 	if (bus_irq < NR_IRQS_LEGACY)
482 		mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
483 	else
484 		mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
485 
486 	acpi_penalize_sci_irq(bus_irq, trigger, polarity);
487 
488 	/*
489 	 * stash over-ride to indicate we've been here
490 	 * and for later update of acpi_gbl_FADT
491 	 */
492 	acpi_sci_override_gsi = gsi;
493 	return;
494 }
495 
496 static int __init
acpi_parse_int_src_ovr(union acpi_subtable_headers * header,const unsigned long end)497 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
498 		       const unsigned long end)
499 {
500 	struct acpi_madt_interrupt_override *intsrc = NULL;
501 
502 	intsrc = (struct acpi_madt_interrupt_override *)header;
503 
504 	if (BAD_MADT_ENTRY(intsrc, end))
505 		return -EINVAL;
506 
507 	acpi_table_print_madt_entry(&header->common);
508 
509 	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
510 		acpi_sci_ioapic_setup(intsrc->source_irq,
511 				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
512 				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
513 				      intsrc->global_irq);
514 		return 0;
515 	}
516 
517 	if (intsrc->source_irq == 0) {
518 		if (acpi_skip_timer_override) {
519 			printk(PREFIX "BIOS IRQ0 override ignored.\n");
520 			return 0;
521 		}
522 
523 		if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
524 			&& (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
525 			intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
526 			printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
527 		}
528 	}
529 
530 	mp_override_legacy_irq(intsrc->source_irq,
531 				intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
532 				(intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
533 				intsrc->global_irq);
534 
535 	return 0;
536 }
537 
538 static int __init
acpi_parse_nmi_src(union acpi_subtable_headers * header,const unsigned long end)539 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
540 {
541 	struct acpi_madt_nmi_source *nmi_src = NULL;
542 
543 	nmi_src = (struct acpi_madt_nmi_source *)header;
544 
545 	if (BAD_MADT_ENTRY(nmi_src, end))
546 		return -EINVAL;
547 
548 	acpi_table_print_madt_entry(&header->common);
549 
550 	/* TBD: Support nimsrc entries? */
551 
552 	return 0;
553 }
554 
555 #endif				/* CONFIG_X86_IO_APIC */
556 
557 /*
558  * acpi_pic_sci_set_trigger()
559  *
560  * use ELCR to set PIC-mode trigger type for SCI
561  *
562  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
563  * it may require Edge Trigger -- use "acpi_sci=edge"
564  *
565  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
566  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
567  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
568  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
569  */
570 
acpi_pic_sci_set_trigger(unsigned int irq,u16 trigger)571 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
572 {
573 	unsigned int mask = 1 << irq;
574 	unsigned int old, new;
575 
576 	/* Real old ELCR mask */
577 	old = inb(0x4d0) | (inb(0x4d1) << 8);
578 
579 	/*
580 	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
581 	 * since we will set it correctly as we enable the PCI irq
582 	 * routing.
583 	 */
584 	new = acpi_noirq ? old : 0;
585 
586 	/*
587 	 * Update SCI information in the ELCR, it isn't in the PCI
588 	 * routing tables..
589 	 */
590 	switch (trigger) {
591 	case 1:		/* Edge - clear */
592 		new &= ~mask;
593 		break;
594 	case 3:		/* Level - set */
595 		new |= mask;
596 		break;
597 	}
598 
599 	if (old == new)
600 		return;
601 
602 	printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
603 	outb(new, 0x4d0);
604 	outb(new >> 8, 0x4d1);
605 }
606 
acpi_gsi_to_irq(u32 gsi,unsigned int * irqp)607 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
608 {
609 	int rc, irq, trigger, polarity;
610 
611 	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
612 		*irqp = gsi;
613 		return 0;
614 	}
615 
616 	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
617 	if (rc)
618 		return rc;
619 
620 	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
621 	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
622 	irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
623 	if (irq < 0)
624 		return irq;
625 
626 	*irqp = irq;
627 	return 0;
628 }
629 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
630 
acpi_isa_irq_to_gsi(unsigned isa_irq,u32 * gsi)631 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
632 {
633 	if (isa_irq < nr_legacy_irqs() &&
634 	    isa_irq_to_gsi[isa_irq] != INVALID_ACPI_IRQ) {
635 		*gsi = isa_irq_to_gsi[isa_irq];
636 		return 0;
637 	}
638 
639 	return -1;
640 }
641 
acpi_register_gsi_pic(struct device * dev,u32 gsi,int trigger,int polarity)642 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
643 				 int trigger, int polarity)
644 {
645 #ifdef CONFIG_PCI
646 	/*
647 	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
648 	 */
649 	if (trigger == ACPI_LEVEL_SENSITIVE)
650 		elcr_set_level_irq(gsi);
651 #endif
652 
653 	return gsi;
654 }
655 
656 #ifdef CONFIG_X86_LOCAL_APIC
acpi_register_gsi_ioapic(struct device * dev,u32 gsi,int trigger,int polarity)657 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
658 				    int trigger, int polarity)
659 {
660 	int irq = gsi;
661 #ifdef CONFIG_X86_IO_APIC
662 	int node;
663 	struct irq_alloc_info info;
664 
665 	node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
666 	trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
667 	polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
668 	ioapic_set_alloc_attr(&info, node, trigger, polarity);
669 
670 	mutex_lock(&acpi_ioapic_lock);
671 	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
672 	/* Don't set up the ACPI SCI because it's already set up */
673 	if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
674 		mp_config_acpi_gsi(dev, gsi, trigger, polarity);
675 	mutex_unlock(&acpi_ioapic_lock);
676 #endif
677 
678 	return irq;
679 }
680 
acpi_unregister_gsi_ioapic(u32 gsi)681 static void acpi_unregister_gsi_ioapic(u32 gsi)
682 {
683 #ifdef CONFIG_X86_IO_APIC
684 	int irq;
685 
686 	mutex_lock(&acpi_ioapic_lock);
687 	irq = mp_map_gsi_to_irq(gsi, 0, NULL);
688 	if (irq > 0)
689 		mp_unmap_irq(irq);
690 	mutex_unlock(&acpi_ioapic_lock);
691 #endif
692 }
693 #endif
694 
695 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
696 			   int trigger, int polarity) = acpi_register_gsi_pic;
697 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
698 
699 #ifdef CONFIG_ACPI_SLEEP
700 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
701 #else
702 int (*acpi_suspend_lowlevel)(void);
703 #endif
704 
705 /*
706  * success: return IRQ number (>=0)
707  * failure: return < 0
708  */
acpi_register_gsi(struct device * dev,u32 gsi,int trigger,int polarity)709 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
710 {
711 	return __acpi_register_gsi(dev, gsi, trigger, polarity);
712 }
713 EXPORT_SYMBOL_GPL(acpi_register_gsi);
714 
acpi_unregister_gsi(u32 gsi)715 void acpi_unregister_gsi(u32 gsi)
716 {
717 	if (__acpi_unregister_gsi)
718 		__acpi_unregister_gsi(gsi);
719 }
720 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
721 
722 #ifdef CONFIG_X86_LOCAL_APIC
acpi_set_irq_model_ioapic(void)723 static void __init acpi_set_irq_model_ioapic(void)
724 {
725 	acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
726 	__acpi_register_gsi = acpi_register_gsi_ioapic;
727 	__acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
728 	acpi_ioapic = 1;
729 }
730 #endif
731 
732 /*
733  *  ACPI based hotplug support for CPU
734  */
735 #ifdef CONFIG_ACPI_HOTPLUG_CPU
736 #include <acpi/processor.h>
737 
acpi_map_cpu2node(acpi_handle handle,int cpu,int physid)738 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
739 {
740 #ifdef CONFIG_ACPI_NUMA
741 	int nid;
742 
743 	nid = acpi_get_node(handle);
744 	if (nid != NUMA_NO_NODE) {
745 		set_apicid_to_node(physid, nid);
746 		numa_set_node(cpu, nid);
747 	}
748 #endif
749 	return 0;
750 }
751 
acpi_map_cpu(acpi_handle handle,phys_cpuid_t physid,u32 acpi_id,int * pcpu)752 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
753 		 int *pcpu)
754 {
755 	int cpu;
756 
757 	cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
758 	if (cpu < 0) {
759 		pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
760 		return cpu;
761 	}
762 
763 	acpi_processor_set_pdc(handle);
764 	acpi_map_cpu2node(handle, cpu, physid);
765 
766 	*pcpu = cpu;
767 	return 0;
768 }
769 EXPORT_SYMBOL(acpi_map_cpu);
770 
acpi_unmap_cpu(int cpu)771 int acpi_unmap_cpu(int cpu)
772 {
773 #ifdef CONFIG_ACPI_NUMA
774 	set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
775 #endif
776 
777 	per_cpu(x86_cpu_to_apicid, cpu) = -1;
778 	set_cpu_present(cpu, false);
779 	num_processors--;
780 
781 	return (0);
782 }
783 EXPORT_SYMBOL(acpi_unmap_cpu);
784 #endif				/* CONFIG_ACPI_HOTPLUG_CPU */
785 
acpi_register_ioapic(acpi_handle handle,u64 phys_addr,u32 gsi_base)786 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
787 {
788 	int ret = -ENOSYS;
789 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
790 	int ioapic_id;
791 	u64 addr;
792 	struct ioapic_domain_cfg cfg = {
793 		.type = IOAPIC_DOMAIN_DYNAMIC,
794 		.ops = &mp_ioapic_irqdomain_ops,
795 	};
796 
797 	ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
798 	if (ioapic_id < 0) {
799 		unsigned long long uid;
800 		acpi_status status;
801 
802 		status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
803 					       NULL, &uid);
804 		if (ACPI_FAILURE(status)) {
805 			acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
806 			return -EINVAL;
807 		}
808 		ioapic_id = (int)uid;
809 	}
810 
811 	mutex_lock(&acpi_ioapic_lock);
812 	ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
813 	mutex_unlock(&acpi_ioapic_lock);
814 #endif
815 
816 	return ret;
817 }
818 EXPORT_SYMBOL(acpi_register_ioapic);
819 
acpi_unregister_ioapic(acpi_handle handle,u32 gsi_base)820 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
821 {
822 	int ret = -ENOSYS;
823 
824 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
825 	mutex_lock(&acpi_ioapic_lock);
826 	ret  = mp_unregister_ioapic(gsi_base);
827 	mutex_unlock(&acpi_ioapic_lock);
828 #endif
829 
830 	return ret;
831 }
832 EXPORT_SYMBOL(acpi_unregister_ioapic);
833 
834 /**
835  * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
836  *			    has been registered
837  * @handle:	ACPI handle of the IOAPIC device
838  * @gsi_base:	GSI base associated with the IOAPIC
839  *
840  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
841  * with acpi_register_ioapic()/acpi_unregister_ioapic().
842  */
acpi_ioapic_registered(acpi_handle handle,u32 gsi_base)843 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
844 {
845 	int ret = 0;
846 
847 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
848 	mutex_lock(&acpi_ioapic_lock);
849 	ret  = mp_ioapic_registered(gsi_base);
850 	mutex_unlock(&acpi_ioapic_lock);
851 #endif
852 
853 	return ret;
854 }
855 
acpi_parse_sbf(struct acpi_table_header * table)856 static int __init acpi_parse_sbf(struct acpi_table_header *table)
857 {
858 	struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
859 
860 	sbf_port = sb->cmos_index;	/* Save CMOS port */
861 
862 	return 0;
863 }
864 
865 #ifdef CONFIG_HPET_TIMER
866 #include <asm/hpet.h>
867 
868 static struct resource *hpet_res __initdata;
869 
acpi_parse_hpet(struct acpi_table_header * table)870 static int __init acpi_parse_hpet(struct acpi_table_header *table)
871 {
872 	struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
873 
874 	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
875 		printk(KERN_WARNING PREFIX "HPET timers must be located in "
876 		       "memory.\n");
877 		return -1;
878 	}
879 
880 	hpet_address = hpet_tbl->address.address;
881 	hpet_blockid = hpet_tbl->sequence;
882 
883 	/*
884 	 * Some broken BIOSes advertise HPET at 0x0. We really do not
885 	 * want to allocate a resource there.
886 	 */
887 	if (!hpet_address) {
888 		printk(KERN_WARNING PREFIX
889 		       "HPET id: %#x base: %#lx is invalid\n",
890 		       hpet_tbl->id, hpet_address);
891 		return 0;
892 	}
893 #ifdef CONFIG_X86_64
894 	/*
895 	 * Some even more broken BIOSes advertise HPET at
896 	 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
897 	 * some noise:
898 	 */
899 	if (hpet_address == 0xfed0000000000000UL) {
900 		if (!hpet_force_user) {
901 			printk(KERN_WARNING PREFIX "HPET id: %#x "
902 			       "base: 0xfed0000000000000 is bogus\n "
903 			       "try hpet=force on the kernel command line to "
904 			       "fix it up to 0xfed00000.\n", hpet_tbl->id);
905 			hpet_address = 0;
906 			return 0;
907 		}
908 		printk(KERN_WARNING PREFIX
909 		       "HPET id: %#x base: 0xfed0000000000000 fixed up "
910 		       "to 0xfed00000.\n", hpet_tbl->id);
911 		hpet_address >>= 32;
912 	}
913 #endif
914 	printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
915 	       hpet_tbl->id, hpet_address);
916 
917 	/*
918 	 * Allocate and initialize the HPET firmware resource for adding into
919 	 * the resource tree during the lateinit timeframe.
920 	 */
921 #define HPET_RESOURCE_NAME_SIZE 9
922 	hpet_res = memblock_alloc(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE,
923 				  SMP_CACHE_BYTES);
924 	if (!hpet_res)
925 		panic("%s: Failed to allocate %zu bytes\n", __func__,
926 		      sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
927 
928 	hpet_res->name = (void *)&hpet_res[1];
929 	hpet_res->flags = IORESOURCE_MEM;
930 	snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
931 		 hpet_tbl->sequence);
932 
933 	hpet_res->start = hpet_address;
934 	hpet_res->end = hpet_address + (1 * 1024) - 1;
935 
936 	return 0;
937 }
938 
939 /*
940  * hpet_insert_resource inserts the HPET resources used into the resource
941  * tree.
942  */
hpet_insert_resource(void)943 static __init int hpet_insert_resource(void)
944 {
945 	if (!hpet_res)
946 		return 1;
947 
948 	return insert_resource(&iomem_resource, hpet_res);
949 }
950 
951 late_initcall(hpet_insert_resource);
952 
953 #else
954 #define	acpi_parse_hpet	NULL
955 #endif
956 
acpi_parse_fadt(struct acpi_table_header * table)957 static int __init acpi_parse_fadt(struct acpi_table_header *table)
958 {
959 	if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
960 		pr_debug("ACPI: no legacy devices present\n");
961 		x86_platform.legacy.devices.pnpbios = 0;
962 	}
963 
964 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
965 	    !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
966 	    x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
967 		pr_debug("ACPI: i8042 controller is absent\n");
968 		x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
969 	}
970 
971 	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
972 		pr_debug("ACPI: not registering RTC platform device\n");
973 		x86_platform.legacy.rtc = 0;
974 	}
975 
976 	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
977 		pr_debug("ACPI: probing for VGA not safe\n");
978 		x86_platform.legacy.no_vga = 1;
979 	}
980 
981 #ifdef CONFIG_X86_PM_TIMER
982 	/* detect the location of the ACPI PM Timer */
983 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
984 		/* FADT rev. 2 */
985 		if (acpi_gbl_FADT.xpm_timer_block.space_id !=
986 		    ACPI_ADR_SPACE_SYSTEM_IO)
987 			return 0;
988 
989 		pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
990 		/*
991 		 * "X" fields are optional extensions to the original V1.0
992 		 * fields, so we must selectively expand V1.0 fields if the
993 		 * corresponding X field is zero.
994 	 	 */
995 		if (!pmtmr_ioport)
996 			pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
997 	} else {
998 		/* FADT rev. 1 */
999 		pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1000 	}
1001 	if (pmtmr_ioport)
1002 		printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
1003 		       pmtmr_ioport);
1004 #endif
1005 	return 0;
1006 }
1007 
1008 #ifdef	CONFIG_X86_LOCAL_APIC
1009 /*
1010  * Parse LAPIC entries in MADT
1011  * returns 0 on success, < 0 on error
1012  */
1013 
early_acpi_parse_madt_lapic_addr_ovr(void)1014 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
1015 {
1016 	int count;
1017 
1018 	if (!boot_cpu_has(X86_FEATURE_APIC))
1019 		return -ENODEV;
1020 
1021 	/*
1022 	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1023 	 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1024 	 */
1025 
1026 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1027 				      acpi_parse_lapic_addr_ovr, 0);
1028 	if (count < 0) {
1029 		printk(KERN_ERR PREFIX
1030 		       "Error parsing LAPIC address override entry\n");
1031 		return count;
1032 	}
1033 
1034 	register_lapic_address(acpi_lapic_addr);
1035 
1036 	return count;
1037 }
1038 
acpi_parse_madt_lapic_entries(void)1039 static int __init acpi_parse_madt_lapic_entries(void)
1040 {
1041 	int count;
1042 	int x2count = 0;
1043 	int ret;
1044 	struct acpi_subtable_proc madt_proc[2];
1045 
1046 	if (!boot_cpu_has(X86_FEATURE_APIC))
1047 		return -ENODEV;
1048 
1049 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1050 				      acpi_parse_sapic, MAX_LOCAL_APIC);
1051 
1052 	if (!count) {
1053 		memset(madt_proc, 0, sizeof(madt_proc));
1054 		madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1055 		madt_proc[0].handler = acpi_parse_lapic;
1056 		madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1057 		madt_proc[1].handler = acpi_parse_x2apic;
1058 		ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1059 				sizeof(struct acpi_table_madt),
1060 				madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1061 		if (ret < 0) {
1062 			printk(KERN_ERR PREFIX
1063 					"Error parsing LAPIC/X2APIC entries\n");
1064 			return ret;
1065 		}
1066 
1067 		count = madt_proc[0].count;
1068 		x2count = madt_proc[1].count;
1069 	}
1070 	if (!count && !x2count) {
1071 		printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1072 		/* TBD: Cleanup to allow fallback to MPS */
1073 		return -ENODEV;
1074 	} else if (count < 0 || x2count < 0) {
1075 		printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1076 		/* TBD: Cleanup to allow fallback to MPS */
1077 		return count;
1078 	}
1079 
1080 	x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1081 					acpi_parse_x2apic_nmi, 0);
1082 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1083 				      acpi_parse_lapic_nmi, 0);
1084 	if (count < 0 || x2count < 0) {
1085 		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1086 		/* TBD: Cleanup to allow fallback to MPS */
1087 		return count;
1088 	}
1089 	return 0;
1090 }
1091 #endif				/* CONFIG_X86_LOCAL_APIC */
1092 
1093 #ifdef	CONFIG_X86_IO_APIC
mp_config_acpi_legacy_irqs(void)1094 static void __init mp_config_acpi_legacy_irqs(void)
1095 {
1096 	int i;
1097 	struct mpc_intsrc mp_irq;
1098 
1099 #ifdef CONFIG_EISA
1100 	/*
1101 	 * Fabricate the legacy ISA bus (bus #31).
1102 	 */
1103 	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1104 #endif
1105 	set_bit(MP_ISA_BUS, mp_bus_not_pci);
1106 	pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());
1107 
1108 	/*
1109 	 * Use the default configuration for the IRQs 0-15.  Unless
1110 	 * overridden by (MADT) interrupt source override entries.
1111 	 */
1112 	for (i = 0; i < nr_legacy_irqs(); i++) {
1113 		int ioapic, pin;
1114 		unsigned int dstapic;
1115 		int idx;
1116 		u32 gsi;
1117 
1118 		/* Locate the gsi that irq i maps to. */
1119 		if (acpi_isa_irq_to_gsi(i, &gsi))
1120 			continue;
1121 
1122 		/*
1123 		 * Locate the IOAPIC that manages the ISA IRQ.
1124 		 */
1125 		ioapic = mp_find_ioapic(gsi);
1126 		if (ioapic < 0)
1127 			continue;
1128 		pin = mp_find_ioapic_pin(ioapic, gsi);
1129 		dstapic = mpc_ioapic_id(ioapic);
1130 
1131 		for (idx = 0; idx < mp_irq_entries; idx++) {
1132 			struct mpc_intsrc *irq = mp_irqs + idx;
1133 
1134 			/* Do we already have a mapping for this ISA IRQ? */
1135 			if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1136 				break;
1137 
1138 			/* Do we already have a mapping for this IOAPIC pin */
1139 			if (irq->dstapic == dstapic && irq->dstirq == pin)
1140 				break;
1141 		}
1142 
1143 		if (idx != mp_irq_entries) {
1144 			printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1145 			continue;	/* IRQ already used */
1146 		}
1147 
1148 		mp_irq.type = MP_INTSRC;
1149 		mp_irq.irqflag = 0;	/* Conforming */
1150 		mp_irq.srcbus = MP_ISA_BUS;
1151 		mp_irq.dstapic = dstapic;
1152 		mp_irq.irqtype = mp_INT;
1153 		mp_irq.srcbusirq = i; /* Identity mapped */
1154 		mp_irq.dstirq = pin;
1155 
1156 		mp_save_irq(&mp_irq);
1157 	}
1158 }
1159 
1160 /*
1161  * Parse IOAPIC related entries in MADT
1162  * returns 0 on success, < 0 on error
1163  */
acpi_parse_madt_ioapic_entries(void)1164 static int __init acpi_parse_madt_ioapic_entries(void)
1165 {
1166 	int count;
1167 
1168 	/*
1169 	 * ACPI interpreter is required to complete interrupt setup,
1170 	 * so if it is off, don't enumerate the io-apics with ACPI.
1171 	 * If MPS is present, it will handle them,
1172 	 * otherwise the system will stay in PIC mode
1173 	 */
1174 	if (acpi_disabled || acpi_noirq)
1175 		return -ENODEV;
1176 
1177 	if (!boot_cpu_has(X86_FEATURE_APIC))
1178 		return -ENODEV;
1179 
1180 	/*
1181 	 * if "noapic" boot option, don't look for IO-APICs
1182 	 */
1183 	if (skip_ioapic_setup) {
1184 		printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1185 		       "due to 'noapic' option.\n");
1186 		return -ENODEV;
1187 	}
1188 
1189 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1190 				      MAX_IO_APICS);
1191 	if (!count) {
1192 		printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1193 		return -ENODEV;
1194 	} else if (count < 0) {
1195 		printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1196 		return count;
1197 	}
1198 
1199 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1200 				      acpi_parse_int_src_ovr, nr_irqs);
1201 	if (count < 0) {
1202 		printk(KERN_ERR PREFIX
1203 		       "Error parsing interrupt source overrides entry\n");
1204 		/* TBD: Cleanup to allow fallback to MPS */
1205 		return count;
1206 	}
1207 
1208 	/*
1209 	 * If BIOS did not supply an INT_SRC_OVR for the SCI
1210 	 * pretend we got one so we can set the SCI flags.
1211 	 * But ignore setting up SCI on hardware reduced platforms.
1212 	 */
1213 	if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
1214 		acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1215 				      acpi_gbl_FADT.sci_interrupt);
1216 
1217 	/* Fill in identity legacy mappings where no override */
1218 	mp_config_acpi_legacy_irqs();
1219 
1220 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1221 				      acpi_parse_nmi_src, nr_irqs);
1222 	if (count < 0) {
1223 		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1224 		/* TBD: Cleanup to allow fallback to MPS */
1225 		return count;
1226 	}
1227 
1228 	return 0;
1229 }
1230 #else
acpi_parse_madt_ioapic_entries(void)1231 static inline int acpi_parse_madt_ioapic_entries(void)
1232 {
1233 	return -1;
1234 }
1235 #endif	/* !CONFIG_X86_IO_APIC */
1236 
early_acpi_process_madt(void)1237 static void __init early_acpi_process_madt(void)
1238 {
1239 #ifdef CONFIG_X86_LOCAL_APIC
1240 	int error;
1241 
1242 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1243 
1244 		/*
1245 		 * Parse MADT LAPIC entries
1246 		 */
1247 		error = early_acpi_parse_madt_lapic_addr_ovr();
1248 		if (!error) {
1249 			acpi_lapic = 1;
1250 			smp_found_config = 1;
1251 		}
1252 		if (error == -EINVAL) {
1253 			/*
1254 			 * Dell Precision Workstation 410, 610 come here.
1255 			 */
1256 			printk(KERN_ERR PREFIX
1257 			       "Invalid BIOS MADT, disabling ACPI\n");
1258 			disable_acpi();
1259 		}
1260 	}
1261 #endif
1262 }
1263 
acpi_process_madt(void)1264 static void __init acpi_process_madt(void)
1265 {
1266 #ifdef CONFIG_X86_LOCAL_APIC
1267 	int error;
1268 
1269 	if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1270 
1271 		/*
1272 		 * Parse MADT LAPIC entries
1273 		 */
1274 		error = acpi_parse_madt_lapic_entries();
1275 		if (!error) {
1276 			acpi_lapic = 1;
1277 
1278 			/*
1279 			 * Parse MADT IO-APIC entries
1280 			 */
1281 			mutex_lock(&acpi_ioapic_lock);
1282 			error = acpi_parse_madt_ioapic_entries();
1283 			mutex_unlock(&acpi_ioapic_lock);
1284 			if (!error) {
1285 				acpi_set_irq_model_ioapic();
1286 
1287 				smp_found_config = 1;
1288 			}
1289 		}
1290 		if (error == -EINVAL) {
1291 			/*
1292 			 * Dell Precision Workstation 410, 610 come here.
1293 			 */
1294 			printk(KERN_ERR PREFIX
1295 			       "Invalid BIOS MADT, disabling ACPI\n");
1296 			disable_acpi();
1297 		}
1298 	} else {
1299 		/*
1300  		 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1301  		 * In the event an MPS table was found, forget it.
1302  		 * Boot with "acpi=off" to use MPS on such a system.
1303  		 */
1304 		if (smp_found_config) {
1305 			printk(KERN_WARNING PREFIX
1306 				"No APIC-table, disabling MPS\n");
1307 			smp_found_config = 0;
1308 		}
1309 	}
1310 
1311 	/*
1312 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1313 	 * processors, where MPS only supports physical.
1314 	 */
1315 	if (acpi_lapic && acpi_ioapic)
1316 		printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1317 		       "information\n");
1318 	else if (acpi_lapic)
1319 		printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1320 		       "configuration information\n");
1321 #endif
1322 	return;
1323 }
1324 
disable_acpi_irq(const struct dmi_system_id * d)1325 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1326 {
1327 	if (!acpi_force) {
1328 		printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1329 		       d->ident);
1330 		acpi_noirq_set();
1331 	}
1332 	return 0;
1333 }
1334 
disable_acpi_pci(const struct dmi_system_id * d)1335 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1336 {
1337 	if (!acpi_force) {
1338 		printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1339 		       d->ident);
1340 		acpi_disable_pci();
1341 	}
1342 	return 0;
1343 }
1344 
disable_acpi_xsdt(const struct dmi_system_id * d)1345 static int __init disable_acpi_xsdt(const struct dmi_system_id *d)
1346 {
1347 	if (!acpi_force) {
1348 		pr_notice("%s detected: force use of acpi=rsdt\n", d->ident);
1349 		acpi_gbl_do_not_use_xsdt = TRUE;
1350 	} else {
1351 		pr_notice("Warning: DMI blacklist says broken, but acpi XSDT forced\n");
1352 	}
1353 	return 0;
1354 }
1355 
dmi_disable_acpi(const struct dmi_system_id * d)1356 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1357 {
1358 	if (!acpi_force) {
1359 		printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1360 		disable_acpi();
1361 	} else {
1362 		printk(KERN_NOTICE
1363 		       "Warning: DMI blacklist says broken, but acpi forced\n");
1364 	}
1365 	return 0;
1366 }
1367 
1368 /*
1369  * Force ignoring BIOS IRQ0 override
1370  */
dmi_ignore_irq0_timer_override(const struct dmi_system_id * d)1371 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1372 {
1373 	if (!acpi_skip_timer_override) {
1374 		pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1375 			d->ident);
1376 		acpi_skip_timer_override = 1;
1377 	}
1378 	return 0;
1379 }
1380 
1381 /*
1382  * ACPI offers an alternative platform interface model that removes
1383  * ACPI hardware requirements for platforms that do not implement
1384  * the PC Architecture.
1385  *
1386  * We initialize the Hardware-reduced ACPI model here:
1387  */
acpi_generic_reduced_hw_init(void)1388 void __init acpi_generic_reduced_hw_init(void)
1389 {
1390 	/*
1391 	 * Override x86_init functions and bypass legacy PIC in
1392 	 * hardware reduced ACPI mode.
1393 	 */
1394 	x86_init.timers.timer_init	= x86_init_noop;
1395 	x86_init.irqs.pre_vector_init	= x86_init_noop;
1396 	legacy_pic			= &null_legacy_pic;
1397 }
1398 
acpi_reduced_hw_init(void)1399 static void __init acpi_reduced_hw_init(void)
1400 {
1401 	if (acpi_gbl_reduced_hardware)
1402 		x86_init.acpi.reduced_hw_early_init();
1403 }
1404 
1405 /*
1406  * If your system is blacklisted here, but you find that acpi=force
1407  * works for you, please contact linux-acpi@vger.kernel.org
1408  */
1409 static const struct dmi_system_id acpi_dmi_table[] __initconst = {
1410 	/*
1411 	 * Boxes that need ACPI disabled
1412 	 */
1413 	{
1414 	 .callback = dmi_disable_acpi,
1415 	 .ident = "IBM Thinkpad",
1416 	 .matches = {
1417 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1418 		     DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1419 		     },
1420 	 },
1421 
1422 	/*
1423 	 * Boxes that need ACPI PCI IRQ routing disabled
1424 	 */
1425 	{
1426 	 .callback = disable_acpi_irq,
1427 	 .ident = "ASUS A7V",
1428 	 .matches = {
1429 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1430 		     DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1431 		     /* newer BIOS, Revision 1011, does work */
1432 		     DMI_MATCH(DMI_BIOS_VERSION,
1433 			       "ASUS A7V ACPI BIOS Revision 1007"),
1434 		     },
1435 	 },
1436 	{
1437 		/*
1438 		 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1439 		 * for LPC bridge, which is needed for the PCI
1440 		 * interrupt links to work. DSDT fix is in bug 5966.
1441 		 * 2645, 2646 model numbers are shared with 600/600E/600X
1442 		 */
1443 	 .callback = disable_acpi_irq,
1444 	 .ident = "IBM Thinkpad 600 Series 2645",
1445 	 .matches = {
1446 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1447 		     DMI_MATCH(DMI_BOARD_NAME, "2645"),
1448 		     },
1449 	 },
1450 	{
1451 	 .callback = disable_acpi_irq,
1452 	 .ident = "IBM Thinkpad 600 Series 2646",
1453 	 .matches = {
1454 		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1455 		     DMI_MATCH(DMI_BOARD_NAME, "2646"),
1456 		     },
1457 	 },
1458 	/*
1459 	 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1460 	 */
1461 	{			/* _BBN 0 bug */
1462 	 .callback = disable_acpi_pci,
1463 	 .ident = "ASUS PR-DLS",
1464 	 .matches = {
1465 		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1466 		     DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1467 		     DMI_MATCH(DMI_BIOS_VERSION,
1468 			       "ASUS PR-DLS ACPI BIOS Revision 1010"),
1469 		     DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1470 		     },
1471 	 },
1472 	{
1473 	 .callback = disable_acpi_pci,
1474 	 .ident = "Acer TravelMate 36x Laptop",
1475 	 .matches = {
1476 		     DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1477 		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1478 		     },
1479 	 },
1480 	/*
1481 	 * Boxes that need ACPI XSDT use disabled due to corrupted tables
1482 	 */
1483 	{
1484 	 .callback = disable_acpi_xsdt,
1485 	 .ident = "Advantech DAC-BJ01",
1486 	 .matches = {
1487 		     DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1488 		     DMI_MATCH(DMI_PRODUCT_NAME, "Bearlake CRB Board"),
1489 		     DMI_MATCH(DMI_BIOS_VERSION, "V1.12"),
1490 		     DMI_MATCH(DMI_BIOS_DATE, "02/01/2011"),
1491 		     },
1492 	 },
1493 	{}
1494 };
1495 
1496 /* second table for DMI checks that should run after early-quirks */
1497 static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
1498 	/*
1499 	 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1500 	 * which includes some code which overrides all temperature
1501 	 * trip points to 16C if the INTIN2 input of the I/O APIC
1502 	 * is enabled.  This input is incorrectly designated the
1503 	 * ISA IRQ 0 via an interrupt source override even though
1504 	 * it is wired to the output of the master 8259A and INTIN0
1505 	 * is not connected at all.  Force ignoring BIOS IRQ0
1506 	 * override in that cases.
1507 	 */
1508 	{
1509 	 .callback = dmi_ignore_irq0_timer_override,
1510 	 .ident = "HP nx6115 laptop",
1511 	 .matches = {
1512 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1513 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1514 		     },
1515 	 },
1516 	{
1517 	 .callback = dmi_ignore_irq0_timer_override,
1518 	 .ident = "HP NX6125 laptop",
1519 	 .matches = {
1520 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1521 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1522 		     },
1523 	 },
1524 	{
1525 	 .callback = dmi_ignore_irq0_timer_override,
1526 	 .ident = "HP NX6325 laptop",
1527 	 .matches = {
1528 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1529 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1530 		     },
1531 	 },
1532 	{
1533 	 .callback = dmi_ignore_irq0_timer_override,
1534 	 .ident = "HP 6715b laptop",
1535 	 .matches = {
1536 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1537 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1538 		     },
1539 	 },
1540 	{
1541 	 .callback = dmi_ignore_irq0_timer_override,
1542 	 .ident = "FUJITSU SIEMENS",
1543 	 .matches = {
1544 		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1545 		     DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1546 		     },
1547 	 },
1548 	{}
1549 };
1550 
1551 /*
1552  * acpi_boot_table_init() and acpi_boot_init()
1553  *  called from setup_arch(), always.
1554  *	1. checksums all tables
1555  *	2. enumerates lapics
1556  *	3. enumerates io-apics
1557  *
1558  * acpi_table_init() is separate to allow reading SRAT without
1559  * other side effects.
1560  *
1561  * side effects of acpi_boot_init:
1562  *	acpi_lapic = 1 if LAPIC found
1563  *	acpi_ioapic = 1 if IOAPIC found
1564  *	if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1565  *	if acpi_blacklisted() acpi_disabled = 1;
1566  *	acpi_irq_model=...
1567  *	...
1568  */
1569 
acpi_boot_table_init(void)1570 void __init acpi_boot_table_init(void)
1571 {
1572 	dmi_check_system(acpi_dmi_table);
1573 
1574 	/*
1575 	 * If acpi_disabled, bail out
1576 	 */
1577 	if (acpi_disabled)
1578 		return;
1579 
1580 	/*
1581 	 * Initialize the ACPI boot-time table parser.
1582 	 */
1583 	if (acpi_locate_initial_tables())
1584 		disable_acpi();
1585 	else
1586 		acpi_reserve_initial_tables();
1587 }
1588 
early_acpi_boot_init(void)1589 int __init early_acpi_boot_init(void)
1590 {
1591 	if (acpi_disabled)
1592 		return 1;
1593 
1594 	acpi_table_init_complete();
1595 
1596 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1597 
1598 	/*
1599 	 * blacklist may disable ACPI entirely
1600 	 */
1601 	if (acpi_blacklisted()) {
1602 		if (acpi_force) {
1603 			printk(KERN_WARNING PREFIX "acpi=force override\n");
1604 		} else {
1605 			printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1606 			disable_acpi();
1607 			return 1;
1608 		}
1609 	}
1610 
1611 	/*
1612 	 * Process the Multiple APIC Description Table (MADT), if present
1613 	 */
1614 	early_acpi_process_madt();
1615 
1616 	/*
1617 	 * Hardware-reduced ACPI mode initialization:
1618 	 */
1619 	acpi_reduced_hw_init();
1620 
1621 	return 0;
1622 }
1623 
acpi_boot_init(void)1624 int __init acpi_boot_init(void)
1625 {
1626 	/* those are executed after early-quirks are executed */
1627 	dmi_check_system(acpi_dmi_table_late);
1628 
1629 	/*
1630 	 * If acpi_disabled, bail out
1631 	 */
1632 	if (acpi_disabled)
1633 		return 1;
1634 
1635 	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1636 
1637 	/*
1638 	 * set sci_int and PM timer address
1639 	 */
1640 	acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1641 
1642 	/*
1643 	 * Process the Multiple APIC Description Table (MADT), if present
1644 	 */
1645 	acpi_process_madt();
1646 
1647 	acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1648 	if (IS_ENABLED(CONFIG_ACPI_BGRT))
1649 		acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1650 
1651 	if (!acpi_noirq)
1652 		x86_init.pci.init = pci_acpi_init;
1653 
1654 	/* Do not enable ACPI SPCR console by default */
1655 	acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
1656 	return 0;
1657 }
1658 
parse_acpi(char * arg)1659 static int __init parse_acpi(char *arg)
1660 {
1661 	if (!arg)
1662 		return -EINVAL;
1663 
1664 	/* "acpi=off" disables both ACPI table parsing and interpreter */
1665 	if (strcmp(arg, "off") == 0) {
1666 		disable_acpi();
1667 	}
1668 	/* acpi=force to over-ride black-list */
1669 	else if (strcmp(arg, "force") == 0) {
1670 		acpi_force = 1;
1671 		acpi_disabled = 0;
1672 	}
1673 	/* acpi=strict disables out-of-spec workarounds */
1674 	else if (strcmp(arg, "strict") == 0) {
1675 		acpi_strict = 1;
1676 	}
1677 	/* acpi=rsdt use RSDT instead of XSDT */
1678 	else if (strcmp(arg, "rsdt") == 0) {
1679 		acpi_gbl_do_not_use_xsdt = TRUE;
1680 	}
1681 	/* "acpi=noirq" disables ACPI interrupt routing */
1682 	else if (strcmp(arg, "noirq") == 0) {
1683 		acpi_noirq_set();
1684 	}
1685 	/* "acpi=copy_dsdt" copys DSDT */
1686 	else if (strcmp(arg, "copy_dsdt") == 0) {
1687 		acpi_gbl_copy_dsdt_locally = 1;
1688 	}
1689 	/* "acpi=nocmcff" disables FF mode for corrected errors */
1690 	else if (strcmp(arg, "nocmcff") == 0) {
1691 		acpi_disable_cmcff = 1;
1692 	} else {
1693 		/* Core will printk when we return error. */
1694 		return -EINVAL;
1695 	}
1696 	return 0;
1697 }
1698 early_param("acpi", parse_acpi);
1699 
1700 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
parse_pci(char * arg)1701 static int __init parse_pci(char *arg)
1702 {
1703 	if (arg && strcmp(arg, "noacpi") == 0)
1704 		acpi_disable_pci();
1705 	return 0;
1706 }
1707 early_param("pci", parse_pci);
1708 
acpi_mps_check(void)1709 int __init acpi_mps_check(void)
1710 {
1711 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1712 /* mptable code is not built-in*/
1713 	if (acpi_disabled || acpi_noirq) {
1714 		printk(KERN_WARNING "MPS support code is not built-in.\n"
1715 		       "Using acpi=off or acpi=noirq or pci=noacpi "
1716 		       "may have problem\n");
1717 		return 1;
1718 	}
1719 #endif
1720 	return 0;
1721 }
1722 
1723 #ifdef CONFIG_X86_IO_APIC
parse_acpi_skip_timer_override(char * arg)1724 static int __init parse_acpi_skip_timer_override(char *arg)
1725 {
1726 	acpi_skip_timer_override = 1;
1727 	return 0;
1728 }
1729 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1730 
parse_acpi_use_timer_override(char * arg)1731 static int __init parse_acpi_use_timer_override(char *arg)
1732 {
1733 	acpi_use_timer_override = 1;
1734 	return 0;
1735 }
1736 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1737 #endif /* CONFIG_X86_IO_APIC */
1738 
setup_acpi_sci(char * s)1739 static int __init setup_acpi_sci(char *s)
1740 {
1741 	if (!s)
1742 		return -EINVAL;
1743 	if (!strcmp(s, "edge"))
1744 		acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1745 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1746 	else if (!strcmp(s, "level"))
1747 		acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1748 			(acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1749 	else if (!strcmp(s, "high"))
1750 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1751 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1752 	else if (!strcmp(s, "low"))
1753 		acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1754 			(acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1755 	else
1756 		return -EINVAL;
1757 	return 0;
1758 }
1759 early_param("acpi_sci", setup_acpi_sci);
1760 
__acpi_acquire_global_lock(unsigned int * lock)1761 int __acpi_acquire_global_lock(unsigned int *lock)
1762 {
1763 	unsigned int old, new, val;
1764 	do {
1765 		old = *lock;
1766 		new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1767 		val = cmpxchg(lock, old, new);
1768 	} while (unlikely (val != old));
1769 	return ((new & 0x3) < 3) ? -1 : 0;
1770 }
1771 
__acpi_release_global_lock(unsigned int * lock)1772 int __acpi_release_global_lock(unsigned int *lock)
1773 {
1774 	unsigned int old, new, val;
1775 	do {
1776 		old = *lock;
1777 		new = old & ~0x3;
1778 		val = cmpxchg(lock, old, new);
1779 	} while (unlikely (val != old));
1780 	return old & 0x1;
1781 }
1782 
arch_reserve_mem_area(acpi_physical_address addr,size_t size)1783 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1784 {
1785 	e820__range_add(addr, size, E820_TYPE_ACPI);
1786 	e820__update_table_print();
1787 }
1788 
x86_default_set_root_pointer(u64 addr)1789 void x86_default_set_root_pointer(u64 addr)
1790 {
1791 	boot_params.acpi_rsdp_addr = addr;
1792 }
1793 
x86_default_get_root_pointer(void)1794 u64 x86_default_get_root_pointer(void)
1795 {
1796 	return boot_params.acpi_rsdp_addr;
1797 }
1798