1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * boot.c - Architecture-Specific Low-Level ACPI Boot Support
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
8 #define pr_fmt(fmt) "ACPI: " fmt
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>
26 #include <asm/e820/api.h>
27 #include <asm/irqdomain.h>
28 #include <asm/pci_x86.h>
29 #include <asm/io_apic.h>
32 #include <asm/mpspec.h>
34 #include <asm/i8259.h>
35 #include <asm/setup.h>
37 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
38 static int __initdata acpi_force = 0;
40 EXPORT_SYMBOL(acpi_disabled);
43 # include <asm/proto.h>
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);
54 int acpi_disable_cmcff;
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;
63 #ifdef CONFIG_X86_LOCAL_APIC
64 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
65 static bool acpi_support_online_capable;
68 #ifdef CONFIG_X86_IO_APIC
70 * Locks related to IOAPIC hotplug
72 * ->device_hotplug_lock
75 * Interrupt mapping side:
80 static DEFINE_MUTEX(acpi_ioapic_lock);
83 /* --------------------------------------------------------------------------
84 Boot-time Configuration
85 -------------------------------------------------------------------------- */
88 * The default interrupt routing model is PIC (8259). This gets
89 * overridden if IOAPICs are enumerated (below).
91 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
95 * ISA irqs by default are the first 16 gsis but can be
96 * any gsi as specified by an interrupt source override.
98 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
99 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
103 * This is just a simple wrapper around early_memremap(),
104 * with sanity checks for phys == 0 and size == 0.
106 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
112 return early_memremap(phys, size);
115 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
120 early_memunmap(map, size);
123 #ifdef CONFIG_X86_LOCAL_APIC
124 static int __init acpi_parse_madt(struct acpi_table_header *table)
126 struct acpi_table_madt *madt = NULL;
128 if (!boot_cpu_has(X86_FEATURE_APIC))
131 madt = (struct acpi_table_madt *)table;
133 pr_warn("Unable to map MADT\n");
138 acpi_lapic_addr = (u64) madt->address;
140 pr_debug("Local APIC address 0x%08x\n", madt->address);
142 if (madt->header.revision >= 5)
143 acpi_support_online_capable = true;
145 default_acpi_madt_oem_check(madt->header.oem_id,
146 madt->header.oem_table_id);
152 * acpi_register_lapic - register a local apic and generates a logic cpu number
153 * @id: local apic id to register
154 * @acpiid: ACPI id to register
155 * @enabled: this cpu is enabled or not
157 * Returns the logic cpu number which maps to the local apic
159 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
161 unsigned int ver = 0;
164 if (id >= MAX_LOCAL_APIC) {
165 pr_info("skipped apicid that is too big\n");
174 if (boot_cpu_physical_apicid != -1U)
175 ver = boot_cpu_apic_version;
177 cpu = generic_processor_info(id, ver);
179 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
185 acpi_parse_x2apic(union acpi_subtable_headers *header, const unsigned long end)
187 struct acpi_madt_local_x2apic *processor = NULL;
188 #ifdef CONFIG_X86_X2APIC
193 processor = (struct acpi_madt_local_x2apic *)header;
195 if (BAD_MADT_ENTRY(processor, end))
198 acpi_table_print_madt_entry(&header->common);
200 #ifdef CONFIG_X86_X2APIC
201 apic_id = processor->local_apic_id;
202 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
204 /* Ignore invalid ID */
205 if (apic_id == 0xffffffff)
209 * We need to register disabled CPU as well to permit
210 * counting disabled CPUs. This allows us to size
211 * cpus_possible_map more accurately, to permit
212 * to not preallocating memory for all NR_CPUS
213 * when we use CPU hotplug.
215 if (!apic->apic_id_valid(apic_id)) {
217 pr_warn("x2apic entry ignored\n");
221 acpi_register_lapic(apic_id, processor->uid, enabled);
223 pr_warn("x2apic entry ignored\n");
230 acpi_parse_lapic(union acpi_subtable_headers * header, const unsigned long end)
232 struct acpi_madt_local_apic *processor = NULL;
234 processor = (struct acpi_madt_local_apic *)header;
236 if (BAD_MADT_ENTRY(processor, end))
239 acpi_table_print_madt_entry(&header->common);
241 /* Ignore invalid ID */
242 if (processor->id == 0xff)
245 /* don't register processors that can not be onlined */
246 if (acpi_support_online_capable &&
247 !(processor->lapic_flags & ACPI_MADT_ENABLED) &&
248 !(processor->lapic_flags & ACPI_MADT_ONLINE_CAPABLE))
252 * We need to register disabled CPU as well to permit
253 * counting disabled CPUs. This allows us to size
254 * cpus_possible_map more accurately, to permit
255 * to not preallocating memory for all NR_CPUS
256 * when we use CPU hotplug.
258 acpi_register_lapic(processor->id, /* APIC ID */
259 processor->processor_id, /* ACPI ID */
260 processor->lapic_flags & ACPI_MADT_ENABLED);
266 acpi_parse_sapic(union acpi_subtable_headers *header, const unsigned long end)
268 struct acpi_madt_local_sapic *processor = NULL;
270 processor = (struct acpi_madt_local_sapic *)header;
272 if (BAD_MADT_ENTRY(processor, end))
275 acpi_table_print_madt_entry(&header->common);
277 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
278 processor->processor_id, /* ACPI ID */
279 processor->lapic_flags & ACPI_MADT_ENABLED);
285 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
286 const unsigned long end)
288 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
290 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
292 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
295 acpi_table_print_madt_entry(&header->common);
297 acpi_lapic_addr = lapic_addr_ovr->address;
303 acpi_parse_x2apic_nmi(union acpi_subtable_headers *header,
304 const unsigned long end)
306 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
308 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
310 if (BAD_MADT_ENTRY(x2apic_nmi, end))
313 acpi_table_print_madt_entry(&header->common);
315 if (x2apic_nmi->lint != 1)
316 pr_warn("NMI not connected to LINT 1!\n");
322 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
324 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
326 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
328 if (BAD_MADT_ENTRY(lapic_nmi, end))
331 acpi_table_print_madt_entry(&header->common);
333 if (lapic_nmi->lint != 1)
334 pr_warn("NMI not connected to LINT 1!\n");
339 #endif /*CONFIG_X86_LOCAL_APIC */
341 #ifdef CONFIG_X86_IO_APIC
344 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
345 u8 trigger, u32 gsi);
347 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
351 * Check bus_irq boundary.
353 if (bus_irq >= NR_IRQS_LEGACY) {
354 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
359 * TBD: This check is for faulty timer entries, where the override
360 * erroneously sets the trigger to level, resulting in a HUGE
361 * increase of timer interrupts!
363 if ((bus_irq == 0) && (trigger == 3))
366 if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
369 * Reset default identity mapping if gsi is also an legacy IRQ,
370 * otherwise there will be more than one entry with the same GSI
371 * and acpi_isa_irq_to_gsi() may give wrong result.
373 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
374 isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
375 isa_irq_to_gsi[bus_irq] = gsi;
378 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
381 #ifdef CONFIG_X86_MPPARSE
382 struct mpc_intsrc mp_irq;
383 struct pci_dev *pdev;
384 unsigned char number;
391 if (!dev || !dev_is_pci(dev))
394 pdev = to_pci_dev(dev);
395 number = pdev->bus->number;
398 /* print the entry should happen on mptable identically */
399 mp_irq.type = MP_INTSRC;
400 mp_irq.irqtype = mp_INT;
401 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
402 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
403 mp_irq.srcbus = number;
404 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
405 ioapic = mp_find_ioapic(gsi);
406 mp_irq.dstapic = mpc_ioapic_id(ioapic);
407 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
409 mp_save_irq(&mp_irq);
414 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
417 struct mpc_intsrc mp_irq;
420 /* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
421 ioapic = mp_find_ioapic(gsi);
423 pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
427 pin = mp_find_ioapic_pin(ioapic, gsi);
429 mp_irq.type = MP_INTSRC;
430 mp_irq.irqtype = mp_INT;
431 mp_irq.irqflag = (trigger << 2) | polarity;
432 mp_irq.srcbus = MP_ISA_BUS;
433 mp_irq.srcbusirq = bus_irq;
434 mp_irq.dstapic = mpc_ioapic_id(ioapic);
437 mp_save_irq(&mp_irq);
443 acpi_parse_ioapic(union acpi_subtable_headers * header, const unsigned long end)
445 struct acpi_madt_io_apic *ioapic = NULL;
446 struct ioapic_domain_cfg cfg = {
447 .type = IOAPIC_DOMAIN_DYNAMIC,
448 .ops = &mp_ioapic_irqdomain_ops,
451 ioapic = (struct acpi_madt_io_apic *)header;
453 if (BAD_MADT_ENTRY(ioapic, end))
456 acpi_table_print_madt_entry(&header->common);
458 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
459 if (ioapic->global_irq_base < nr_legacy_irqs())
460 cfg.type = IOAPIC_DOMAIN_LEGACY;
462 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
469 * Parse Interrupt Source Override for the ACPI SCI
471 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
473 if (trigger == 0) /* compatible SCI trigger is level */
476 if (polarity == 0) /* compatible SCI polarity is low */
479 /* Command-line over-ride via acpi_sci= */
480 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
481 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
483 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
484 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
486 if (bus_irq < NR_IRQS_LEGACY)
487 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
489 mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
491 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
494 * stash over-ride to indicate we've been here
495 * and for later update of acpi_gbl_FADT
497 acpi_sci_override_gsi = gsi;
502 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
503 const unsigned long end)
505 struct acpi_madt_interrupt_override *intsrc = NULL;
507 intsrc = (struct acpi_madt_interrupt_override *)header;
509 if (BAD_MADT_ENTRY(intsrc, end))
512 acpi_table_print_madt_entry(&header->common);
514 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
515 acpi_sci_ioapic_setup(intsrc->source_irq,
516 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
517 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
522 if (intsrc->source_irq == 0) {
523 if (acpi_skip_timer_override) {
524 pr_warn("BIOS IRQ0 override ignored.\n");
528 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
529 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
530 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
531 pr_warn("BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
535 mp_override_legacy_irq(intsrc->source_irq,
536 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
537 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
544 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
546 struct acpi_madt_nmi_source *nmi_src = NULL;
548 nmi_src = (struct acpi_madt_nmi_source *)header;
550 if (BAD_MADT_ENTRY(nmi_src, end))
553 acpi_table_print_madt_entry(&header->common);
555 /* TBD: Support nimsrc entries? */
560 #endif /* CONFIG_X86_IO_APIC */
563 * acpi_pic_sci_set_trigger()
565 * use ELCR to set PIC-mode trigger type for SCI
567 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
568 * it may require Edge Trigger -- use "acpi_sci=edge"
570 * Port 0x4d0-4d1 are ELCR1 and ELCR2, the Edge/Level Control Registers
571 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
572 * ELCR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
573 * ELCR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
576 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
578 unsigned int mask = 1 << irq;
579 unsigned int old, new;
581 /* Real old ELCR mask */
582 old = inb(PIC_ELCR1) | (inb(PIC_ELCR2) << 8);
585 * If we use ACPI to set PCI IRQs, then we should clear ELCR
586 * since we will set it correctly as we enable the PCI irq
589 new = acpi_noirq ? old : 0;
592 * Update SCI information in the ELCR, it isn't in the PCI
596 case 1: /* Edge - clear */
599 case 3: /* Level - set */
607 pr_warn("setting ELCR to %04x (from %04x)\n", new, old);
608 outb(new, PIC_ELCR1);
609 outb(new >> 8, PIC_ELCR2);
612 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
614 int rc, irq, trigger, polarity;
616 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
621 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
625 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
626 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
627 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
634 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
636 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
638 if (isa_irq < nr_legacy_irqs() &&
639 isa_irq_to_gsi[isa_irq] != INVALID_ACPI_IRQ) {
640 *gsi = isa_irq_to_gsi[isa_irq];
647 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
648 int trigger, int polarity)
652 * Make sure all (legacy) PCI IRQs are set as level-triggered.
654 if (trigger == ACPI_LEVEL_SENSITIVE)
655 elcr_set_level_irq(gsi);
661 #ifdef CONFIG_X86_LOCAL_APIC
662 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
663 int trigger, int polarity)
666 #ifdef CONFIG_X86_IO_APIC
668 struct irq_alloc_info info;
670 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
671 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
672 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
673 ioapic_set_alloc_attr(&info, node, trigger, polarity);
675 mutex_lock(&acpi_ioapic_lock);
676 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
677 /* Don't set up the ACPI SCI because it's already set up */
678 if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
679 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
680 mutex_unlock(&acpi_ioapic_lock);
686 static void acpi_unregister_gsi_ioapic(u32 gsi)
688 #ifdef CONFIG_X86_IO_APIC
691 mutex_lock(&acpi_ioapic_lock);
692 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
695 mutex_unlock(&acpi_ioapic_lock);
700 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
701 int trigger, int polarity) = acpi_register_gsi_pic;
702 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
704 #ifdef CONFIG_ACPI_SLEEP
705 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
707 int (*acpi_suspend_lowlevel)(void);
711 * success: return IRQ number (>=0)
712 * failure: return < 0
714 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
716 return __acpi_register_gsi(dev, gsi, trigger, polarity);
718 EXPORT_SYMBOL_GPL(acpi_register_gsi);
720 void acpi_unregister_gsi(u32 gsi)
722 if (__acpi_unregister_gsi)
723 __acpi_unregister_gsi(gsi);
725 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
727 #ifdef CONFIG_X86_LOCAL_APIC
728 static void __init acpi_set_irq_model_ioapic(void)
730 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
731 __acpi_register_gsi = acpi_register_gsi_ioapic;
732 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
738 * ACPI based hotplug support for CPU
740 #ifdef CONFIG_ACPI_HOTPLUG_CPU
741 #include <acpi/processor.h>
743 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
745 #ifdef CONFIG_ACPI_NUMA
748 nid = acpi_get_node(handle);
749 if (nid != NUMA_NO_NODE) {
750 set_apicid_to_node(physid, nid);
751 numa_set_node(cpu, nid);
757 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
762 cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
764 pr_info("Unable to map lapic to logical cpu number\n");
768 acpi_processor_set_pdc(handle);
769 acpi_map_cpu2node(handle, cpu, physid);
774 EXPORT_SYMBOL(acpi_map_cpu);
776 int acpi_unmap_cpu(int cpu)
778 #ifdef CONFIG_ACPI_NUMA
779 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
782 per_cpu(x86_cpu_to_apicid, cpu) = -1;
783 set_cpu_present(cpu, false);
788 EXPORT_SYMBOL(acpi_unmap_cpu);
789 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
791 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
794 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
797 struct ioapic_domain_cfg cfg = {
798 .type = IOAPIC_DOMAIN_DYNAMIC,
799 .ops = &mp_ioapic_irqdomain_ops,
802 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
804 unsigned long long uid;
807 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
809 if (ACPI_FAILURE(status)) {
810 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
813 ioapic_id = (int)uid;
816 mutex_lock(&acpi_ioapic_lock);
817 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
818 mutex_unlock(&acpi_ioapic_lock);
823 EXPORT_SYMBOL(acpi_register_ioapic);
825 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
829 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
830 mutex_lock(&acpi_ioapic_lock);
831 ret = mp_unregister_ioapic(gsi_base);
832 mutex_unlock(&acpi_ioapic_lock);
837 EXPORT_SYMBOL(acpi_unregister_ioapic);
840 * acpi_ioapic_registered - Check whether IOAPIC associated with @gsi_base
841 * has been registered
842 * @handle: ACPI handle of the IOAPIC device
843 * @gsi_base: GSI base associated with the IOAPIC
845 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
846 * with acpi_register_ioapic()/acpi_unregister_ioapic().
848 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
852 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
853 mutex_lock(&acpi_ioapic_lock);
854 ret = mp_ioapic_registered(gsi_base);
855 mutex_unlock(&acpi_ioapic_lock);
861 static int __init acpi_parse_sbf(struct acpi_table_header *table)
863 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
865 sbf_port = sb->cmos_index; /* Save CMOS port */
870 #ifdef CONFIG_HPET_TIMER
871 #include <asm/hpet.h>
873 static struct resource *hpet_res __initdata;
875 static int __init acpi_parse_hpet(struct acpi_table_header *table)
877 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
879 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
880 pr_warn("HPET timers must be located in memory.\n");
884 hpet_address = hpet_tbl->address.address;
885 hpet_blockid = hpet_tbl->sequence;
888 * Some broken BIOSes advertise HPET at 0x0. We really do not
889 * want to allocate a resource there.
892 pr_warn("HPET id: %#x base: %#lx is invalid\n", hpet_tbl->id, hpet_address);
897 * Some even more broken BIOSes advertise HPET at
898 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
901 if (hpet_address == 0xfed0000000000000UL) {
902 if (!hpet_force_user) {
903 pr_warn("HPET id: %#x base: 0xfed0000000000000 is bogus, try hpet=force on the kernel command line to fix it up to 0xfed00000.\n",
908 pr_warn("HPET id: %#x base: 0xfed0000000000000 fixed up to 0xfed00000.\n",
913 pr_info("HPET id: %#x base: %#lx\n", hpet_tbl->id, hpet_address);
916 * Allocate and initialize the HPET firmware resource for adding into
917 * the resource tree during the lateinit timeframe.
919 #define HPET_RESOURCE_NAME_SIZE 9
920 hpet_res = memblock_alloc(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE,
923 panic("%s: Failed to allocate %zu bytes\n", __func__,
924 sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
926 hpet_res->name = (void *)&hpet_res[1];
927 hpet_res->flags = IORESOURCE_MEM;
928 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
931 hpet_res->start = hpet_address;
932 hpet_res->end = hpet_address + (1 * 1024) - 1;
938 * hpet_insert_resource inserts the HPET resources used into the resource
941 static __init int hpet_insert_resource(void)
946 return insert_resource(&iomem_resource, hpet_res);
949 late_initcall(hpet_insert_resource);
952 #define acpi_parse_hpet NULL
955 static int __init acpi_parse_fadt(struct acpi_table_header *table)
957 if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
958 pr_debug("no legacy devices present\n");
959 x86_platform.legacy.devices.pnpbios = 0;
962 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
963 !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
964 x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
965 pr_debug("i8042 controller is absent\n");
966 x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
969 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
970 pr_debug("not registering RTC platform device\n");
971 x86_platform.legacy.rtc = 0;
974 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
975 pr_debug("probing for VGA not safe\n");
976 x86_platform.legacy.no_vga = 1;
979 #ifdef CONFIG_X86_PM_TIMER
980 /* detect the location of the ACPI PM Timer */
981 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
983 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
984 ACPI_ADR_SPACE_SYSTEM_IO)
987 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
989 * "X" fields are optional extensions to the original V1.0
990 * fields, so we must selectively expand V1.0 fields if the
991 * corresponding X field is zero.
994 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
997 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1000 pr_info("PM-Timer IO Port: %#x\n", pmtmr_ioport);
1005 #ifdef CONFIG_X86_LOCAL_APIC
1007 * Parse LAPIC entries in MADT
1008 * returns 0 on success, < 0 on error
1011 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
1015 if (!boot_cpu_has(X86_FEATURE_APIC))
1019 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1020 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1023 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1024 acpi_parse_lapic_addr_ovr, 0);
1026 pr_err("Error parsing LAPIC address override entry\n");
1030 register_lapic_address(acpi_lapic_addr);
1035 static int __init acpi_parse_madt_lapic_entries(void)
1040 struct acpi_subtable_proc madt_proc[2];
1042 if (!boot_cpu_has(X86_FEATURE_APIC))
1045 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1046 acpi_parse_sapic, MAX_LOCAL_APIC);
1049 memset(madt_proc, 0, sizeof(madt_proc));
1050 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1051 madt_proc[0].handler = acpi_parse_lapic;
1052 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1053 madt_proc[1].handler = acpi_parse_x2apic;
1054 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1055 sizeof(struct acpi_table_madt),
1056 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1058 pr_err("Error parsing LAPIC/X2APIC entries\n");
1062 count = madt_proc[0].count;
1063 x2count = madt_proc[1].count;
1065 if (!count && !x2count) {
1066 pr_err("No LAPIC entries present\n");
1067 /* TBD: Cleanup to allow fallback to MPS */
1069 } else if (count < 0 || x2count < 0) {
1070 pr_err("Error parsing LAPIC entry\n");
1071 /* TBD: Cleanup to allow fallback to MPS */
1075 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1076 acpi_parse_x2apic_nmi, 0);
1077 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1078 acpi_parse_lapic_nmi, 0);
1079 if (count < 0 || x2count < 0) {
1080 pr_err("Error parsing LAPIC NMI entry\n");
1081 /* TBD: Cleanup to allow fallback to MPS */
1086 #endif /* CONFIG_X86_LOCAL_APIC */
1088 #ifdef CONFIG_X86_IO_APIC
1089 static void __init mp_config_acpi_legacy_irqs(void)
1092 struct mpc_intsrc mp_irq;
1096 * Fabricate the legacy ISA bus (bus #31).
1098 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1100 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1101 pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());
1104 * Use the default configuration for the IRQs 0-15. Unless
1105 * overridden by (MADT) interrupt source override entries.
1107 for (i = 0; i < nr_legacy_irqs(); i++) {
1109 unsigned int dstapic;
1113 /* Locate the gsi that irq i maps to. */
1114 if (acpi_isa_irq_to_gsi(i, &gsi))
1118 * Locate the IOAPIC that manages the ISA IRQ.
1120 ioapic = mp_find_ioapic(gsi);
1123 pin = mp_find_ioapic_pin(ioapic, gsi);
1124 dstapic = mpc_ioapic_id(ioapic);
1126 for (idx = 0; idx < mp_irq_entries; idx++) {
1127 struct mpc_intsrc *irq = mp_irqs + idx;
1129 /* Do we already have a mapping for this ISA IRQ? */
1130 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1133 /* Do we already have a mapping for this IOAPIC pin */
1134 if (irq->dstapic == dstapic && irq->dstirq == pin)
1138 if (idx != mp_irq_entries) {
1139 pr_debug("ACPI: IRQ%d used by override.\n", i);
1140 continue; /* IRQ already used */
1143 mp_irq.type = MP_INTSRC;
1144 mp_irq.irqflag = 0; /* Conforming */
1145 mp_irq.srcbus = MP_ISA_BUS;
1146 mp_irq.dstapic = dstapic;
1147 mp_irq.irqtype = mp_INT;
1148 mp_irq.srcbusirq = i; /* Identity mapped */
1149 mp_irq.dstirq = pin;
1151 mp_save_irq(&mp_irq);
1156 * Parse IOAPIC related entries in MADT
1157 * returns 0 on success, < 0 on error
1159 static int __init acpi_parse_madt_ioapic_entries(void)
1164 * ACPI interpreter is required to complete interrupt setup,
1165 * so if it is off, don't enumerate the io-apics with ACPI.
1166 * If MPS is present, it will handle them,
1167 * otherwise the system will stay in PIC mode
1169 if (acpi_disabled || acpi_noirq)
1172 if (!boot_cpu_has(X86_FEATURE_APIC))
1176 * if "noapic" boot option, don't look for IO-APICs
1178 if (skip_ioapic_setup) {
1179 pr_info("Skipping IOAPIC probe due to 'noapic' option.\n");
1183 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1186 pr_err("No IOAPIC entries present\n");
1188 } else if (count < 0) {
1189 pr_err("Error parsing IOAPIC entry\n");
1193 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1194 acpi_parse_int_src_ovr, nr_irqs);
1196 pr_err("Error parsing interrupt source overrides entry\n");
1197 /* TBD: Cleanup to allow fallback to MPS */
1202 * If BIOS did not supply an INT_SRC_OVR for the SCI
1203 * pretend we got one so we can set the SCI flags.
1204 * But ignore setting up SCI on hardware reduced platforms.
1206 if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
1207 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1208 acpi_gbl_FADT.sci_interrupt);
1210 /* Fill in identity legacy mappings where no override */
1211 mp_config_acpi_legacy_irqs();
1213 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1214 acpi_parse_nmi_src, nr_irqs);
1216 pr_err("Error parsing NMI SRC entry\n");
1217 /* TBD: Cleanup to allow fallback to MPS */
1224 static inline int acpi_parse_madt_ioapic_entries(void)
1228 #endif /* !CONFIG_X86_IO_APIC */
1230 static void __init early_acpi_process_madt(void)
1232 #ifdef CONFIG_X86_LOCAL_APIC
1235 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1238 * Parse MADT LAPIC entries
1240 error = early_acpi_parse_madt_lapic_addr_ovr();
1243 smp_found_config = 1;
1245 if (error == -EINVAL) {
1247 * Dell Precision Workstation 410, 610 come here.
1249 pr_err("Invalid BIOS MADT, disabling ACPI\n");
1256 static void __init acpi_process_madt(void)
1258 #ifdef CONFIG_X86_LOCAL_APIC
1261 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1264 * Parse MADT LAPIC entries
1266 error = acpi_parse_madt_lapic_entries();
1271 * Parse MADT IO-APIC entries
1273 mutex_lock(&acpi_ioapic_lock);
1274 error = acpi_parse_madt_ioapic_entries();
1275 mutex_unlock(&acpi_ioapic_lock);
1277 acpi_set_irq_model_ioapic();
1279 smp_found_config = 1;
1282 if (error == -EINVAL) {
1284 * Dell Precision Workstation 410, 610 come here.
1286 pr_err("Invalid BIOS MADT, disabling ACPI\n");
1291 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1292 * In the event an MPS table was found, forget it.
1293 * Boot with "acpi=off" to use MPS on such a system.
1295 if (smp_found_config) {
1296 pr_warn("No APIC-table, disabling MPS\n");
1297 smp_found_config = 0;
1302 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1303 * processors, where MPS only supports physical.
1305 if (acpi_lapic && acpi_ioapic)
1306 pr_info("Using ACPI (MADT) for SMP configuration information\n");
1307 else if (acpi_lapic)
1308 pr_info("Using ACPI for processor (LAPIC) configuration information\n");
1313 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1316 pr_notice("%s detected: force use of acpi=noirq\n", d->ident);
1322 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1325 pr_notice("%s detected: force use of pci=noacpi\n", d->ident);
1331 static int __init disable_acpi_xsdt(const struct dmi_system_id *d)
1334 pr_notice("%s detected: force use of acpi=rsdt\n", d->ident);
1335 acpi_gbl_do_not_use_xsdt = TRUE;
1337 pr_notice("Warning: DMI blacklist says broken, but acpi XSDT forced\n");
1342 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1345 pr_notice("%s detected: acpi off\n", d->ident);
1348 pr_notice("Warning: DMI blacklist says broken, but acpi forced\n");
1354 * Force ignoring BIOS IRQ0 override
1356 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1358 if (!acpi_skip_timer_override) {
1359 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1361 acpi_skip_timer_override = 1;
1367 * ACPI offers an alternative platform interface model that removes
1368 * ACPI hardware requirements for platforms that do not implement
1369 * the PC Architecture.
1371 * We initialize the Hardware-reduced ACPI model here:
1373 void __init acpi_generic_reduced_hw_init(void)
1376 * Override x86_init functions and bypass legacy PIC in
1377 * hardware reduced ACPI mode.
1379 x86_init.timers.timer_init = x86_init_noop;
1380 x86_init.irqs.pre_vector_init = x86_init_noop;
1381 legacy_pic = &null_legacy_pic;
1384 static void __init acpi_reduced_hw_init(void)
1386 if (acpi_gbl_reduced_hardware)
1387 x86_init.acpi.reduced_hw_early_init();
1391 * If your system is blacklisted here, but you find that acpi=force
1392 * works for you, please contact linux-acpi@vger.kernel.org
1394 static const struct dmi_system_id acpi_dmi_table[] __initconst = {
1396 * Boxes that need ACPI disabled
1399 .callback = dmi_disable_acpi,
1400 .ident = "IBM Thinkpad",
1402 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1403 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1408 * Boxes that need ACPI PCI IRQ routing disabled
1411 .callback = disable_acpi_irq,
1412 .ident = "ASUS A7V",
1414 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1415 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1416 /* newer BIOS, Revision 1011, does work */
1417 DMI_MATCH(DMI_BIOS_VERSION,
1418 "ASUS A7V ACPI BIOS Revision 1007"),
1423 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1424 * for LPC bridge, which is needed for the PCI
1425 * interrupt links to work. DSDT fix is in bug 5966.
1426 * 2645, 2646 model numbers are shared with 600/600E/600X
1428 .callback = disable_acpi_irq,
1429 .ident = "IBM Thinkpad 600 Series 2645",
1431 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1432 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1436 .callback = disable_acpi_irq,
1437 .ident = "IBM Thinkpad 600 Series 2646",
1439 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1440 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1444 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1447 .callback = disable_acpi_pci,
1448 .ident = "ASUS PR-DLS",
1450 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1451 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1452 DMI_MATCH(DMI_BIOS_VERSION,
1453 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1454 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1458 .callback = disable_acpi_pci,
1459 .ident = "Acer TravelMate 36x Laptop",
1461 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1462 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1466 * Boxes that need ACPI XSDT use disabled due to corrupted tables
1469 .callback = disable_acpi_xsdt,
1470 .ident = "Advantech DAC-BJ01",
1472 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1473 DMI_MATCH(DMI_PRODUCT_NAME, "Bearlake CRB Board"),
1474 DMI_MATCH(DMI_BIOS_VERSION, "V1.12"),
1475 DMI_MATCH(DMI_BIOS_DATE, "02/01/2011"),
1481 /* second table for DMI checks that should run after early-quirks */
1482 static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
1484 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1485 * which includes some code which overrides all temperature
1486 * trip points to 16C if the INTIN2 input of the I/O APIC
1487 * is enabled. This input is incorrectly designated the
1488 * ISA IRQ 0 via an interrupt source override even though
1489 * it is wired to the output of the master 8259A and INTIN0
1490 * is not connected at all. Force ignoring BIOS IRQ0
1491 * override in that cases.
1494 .callback = dmi_ignore_irq0_timer_override,
1495 .ident = "HP nx6115 laptop",
1497 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1498 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1502 .callback = dmi_ignore_irq0_timer_override,
1503 .ident = "HP NX6125 laptop",
1505 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1506 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1510 .callback = dmi_ignore_irq0_timer_override,
1511 .ident = "HP NX6325 laptop",
1513 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1514 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1518 .callback = dmi_ignore_irq0_timer_override,
1519 .ident = "HP 6715b laptop",
1521 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1522 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1526 .callback = dmi_ignore_irq0_timer_override,
1527 .ident = "FUJITSU SIEMENS",
1529 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1530 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1537 * acpi_boot_table_init() and acpi_boot_init()
1538 * called from setup_arch(), always.
1539 * 1. checksums all tables
1540 * 2. enumerates lapics
1541 * 3. enumerates io-apics
1543 * acpi_table_init() is separate to allow reading SRAT without
1544 * other side effects.
1546 * side effects of acpi_boot_init:
1547 * acpi_lapic = 1 if LAPIC found
1548 * acpi_ioapic = 1 if IOAPIC found
1549 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1550 * if acpi_blacklisted() acpi_disabled = 1;
1551 * acpi_irq_model=...
1555 void __init acpi_boot_table_init(void)
1557 dmi_check_system(acpi_dmi_table);
1560 * If acpi_disabled, bail out
1566 * Initialize the ACPI boot-time table parser.
1568 if (acpi_locate_initial_tables())
1571 acpi_reserve_initial_tables();
1574 int __init early_acpi_boot_init(void)
1579 acpi_table_init_complete();
1581 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1584 * blacklist may disable ACPI entirely
1586 if (acpi_blacklisted()) {
1588 pr_warn("acpi=force override\n");
1590 pr_warn("Disabling ACPI support\n");
1597 * Process the Multiple APIC Description Table (MADT), if present
1599 early_acpi_process_madt();
1602 * Hardware-reduced ACPI mode initialization:
1604 acpi_reduced_hw_init();
1609 int __init acpi_boot_init(void)
1611 /* those are executed after early-quirks are executed */
1612 dmi_check_system(acpi_dmi_table_late);
1615 * If acpi_disabled, bail out
1620 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1623 * set sci_int and PM timer address
1625 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1628 * Process the Multiple APIC Description Table (MADT), if present
1630 acpi_process_madt();
1632 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1633 if (IS_ENABLED(CONFIG_ACPI_BGRT) && !acpi_nobgrt)
1634 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1637 x86_init.pci.init = pci_acpi_init;
1639 /* Do not enable ACPI SPCR console by default */
1640 acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
1644 static int __init parse_acpi(char *arg)
1649 /* "acpi=off" disables both ACPI table parsing and interpreter */
1650 if (strcmp(arg, "off") == 0) {
1653 /* acpi=force to over-ride black-list */
1654 else if (strcmp(arg, "force") == 0) {
1658 /* acpi=strict disables out-of-spec workarounds */
1659 else if (strcmp(arg, "strict") == 0) {
1662 /* acpi=rsdt use RSDT instead of XSDT */
1663 else if (strcmp(arg, "rsdt") == 0) {
1664 acpi_gbl_do_not_use_xsdt = TRUE;
1666 /* "acpi=noirq" disables ACPI interrupt routing */
1667 else if (strcmp(arg, "noirq") == 0) {
1670 /* "acpi=copy_dsdt" copies DSDT */
1671 else if (strcmp(arg, "copy_dsdt") == 0) {
1672 acpi_gbl_copy_dsdt_locally = 1;
1674 /* "acpi=nocmcff" disables FF mode for corrected errors */
1675 else if (strcmp(arg, "nocmcff") == 0) {
1676 acpi_disable_cmcff = 1;
1678 /* Core will printk when we return error. */
1683 early_param("acpi", parse_acpi);
1685 static int __init parse_acpi_bgrt(char *arg)
1690 early_param("bgrt_disable", parse_acpi_bgrt);
1692 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1693 static int __init parse_pci(char *arg)
1695 if (arg && strcmp(arg, "noacpi") == 0)
1699 early_param("pci", parse_pci);
1701 int __init acpi_mps_check(void)
1703 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1704 /* mptable code is not built-in*/
1705 if (acpi_disabled || acpi_noirq) {
1706 pr_warn("MPS support code is not built-in, using acpi=off or acpi=noirq or pci=noacpi may have problem\n");
1713 #ifdef CONFIG_X86_IO_APIC
1714 static int __init parse_acpi_skip_timer_override(char *arg)
1716 acpi_skip_timer_override = 1;
1719 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1721 static int __init parse_acpi_use_timer_override(char *arg)
1723 acpi_use_timer_override = 1;
1726 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1727 #endif /* CONFIG_X86_IO_APIC */
1729 static int __init setup_acpi_sci(char *s)
1733 if (!strcmp(s, "edge"))
1734 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1735 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1736 else if (!strcmp(s, "level"))
1737 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1738 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1739 else if (!strcmp(s, "high"))
1740 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1741 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1742 else if (!strcmp(s, "low"))
1743 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1744 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1749 early_param("acpi_sci", setup_acpi_sci);
1751 int __acpi_acquire_global_lock(unsigned int *lock)
1753 unsigned int old, new, val;
1756 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1757 val = cmpxchg(lock, old, new);
1758 } while (unlikely (val != old));
1759 return ((new & 0x3) < 3) ? -1 : 0;
1762 int __acpi_release_global_lock(unsigned int *lock)
1764 unsigned int old, new, val;
1768 val = cmpxchg(lock, old, new);
1769 } while (unlikely (val != old));
1773 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1775 e820__range_add(addr, size, E820_TYPE_NVS);
1776 e820__update_table_print();
1779 void x86_default_set_root_pointer(u64 addr)
1781 boot_params.acpi_rsdp_addr = addr;
1784 u64 x86_default_get_root_pointer(void)
1786 return boot_params.acpi_rsdp_addr;