2 * boot.c - Architecture-Specific Low-Level ACPI Boot Support
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 * Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/init.h>
27 #include <linux/acpi.h>
28 #include <linux/acpi_pmtmr.h>
29 #include <linux/efi.h>
30 #include <linux/cpumask.h>
31 #include <linux/export.h>
32 #include <linux/dmi.h>
33 #include <linux/irq.h>
34 #include <linux/slab.h>
35 #include <linux/memblock.h>
36 #include <linux/ioport.h>
37 #include <linux/pci.h>
38 #include <linux/efi-bgrt.h>
39 #include <linux/serial_core.h>
41 #include <asm/e820/api.h>
42 #include <asm/irqdomain.h>
43 #include <asm/pci_x86.h>
44 #include <asm/pgtable.h>
45 #include <asm/io_apic.h>
48 #include <asm/mpspec.h>
50 #include <asm/i8259.h>
51 #include <asm/setup.h>
53 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
54 static int __initdata acpi_force = 0;
56 EXPORT_SYMBOL(acpi_disabled);
59 # include <asm/proto.h>
62 #define PREFIX "ACPI: "
64 int acpi_noirq; /* skip ACPI IRQ initialization */
65 int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
66 EXPORT_SYMBOL(acpi_pci_disabled);
71 int acpi_disable_cmcff;
73 /* ACPI SCI override configuration */
74 u8 acpi_sci_flags __initdata;
75 u32 acpi_sci_override_gsi __initdata = INVALID_ACPI_IRQ;
76 int acpi_skip_timer_override __initdata;
77 int acpi_use_timer_override __initdata;
78 int acpi_fix_pin2_polarity __initdata;
80 #ifdef CONFIG_X86_LOCAL_APIC
81 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
84 #ifdef CONFIG_X86_IO_APIC
86 * Locks related to IOAPIC hotplug
88 * ->device_hotplug_lock
91 * Interrupt mapping side:
96 static DEFINE_MUTEX(acpi_ioapic_lock);
99 /* --------------------------------------------------------------------------
100 Boot-time Configuration
101 -------------------------------------------------------------------------- */
104 * The default interrupt routing model is PIC (8259). This gets
105 * overridden if IOAPICs are enumerated (below).
107 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
111 * ISA irqs by default are the first 16 gsis but can be
112 * any gsi as specified by an interrupt source override.
114 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
115 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
119 * This is just a simple wrapper around early_memremap(),
120 * with sanity checks for phys == 0 and size == 0.
122 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
128 return early_memremap(phys, size);
131 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
136 early_memunmap(map, size);
139 #ifdef CONFIG_X86_LOCAL_APIC
140 static int __init acpi_parse_madt(struct acpi_table_header *table)
142 struct acpi_table_madt *madt = NULL;
144 if (!boot_cpu_has(X86_FEATURE_APIC))
147 madt = (struct acpi_table_madt *)table;
149 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
154 acpi_lapic_addr = (u64) madt->address;
156 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
160 default_acpi_madt_oem_check(madt->header.oem_id,
161 madt->header.oem_table_id);
167 * acpi_register_lapic - register a local apic and generates a logic cpu number
168 * @id: local apic id to register
169 * @acpiid: ACPI id to register
170 * @enabled: this cpu is enabled or not
172 * Returns the logic cpu number which maps to the local apic
174 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
176 unsigned int ver = 0;
179 if (id >= MAX_LOCAL_APIC) {
180 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
189 if (boot_cpu_physical_apicid != -1U)
190 ver = boot_cpu_apic_version;
192 cpu = generic_processor_info(id, ver);
194 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
200 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
202 struct acpi_madt_local_x2apic *processor = NULL;
203 #ifdef CONFIG_X86_X2APIC
208 processor = (struct acpi_madt_local_x2apic *)header;
210 if (BAD_MADT_ENTRY(processor, end))
213 acpi_table_print_madt_entry(header);
215 #ifdef CONFIG_X86_X2APIC
216 apic_id = processor->local_apic_id;
217 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
219 /* Ignore invalid ID */
220 if (apic_id == 0xffffffff)
224 * We need to register disabled CPU as well to permit
225 * counting disabled CPUs. This allows us to size
226 * cpus_possible_map more accurately, to permit
227 * to not preallocating memory for all NR_CPUS
228 * when we use CPU hotplug.
230 if (!apic->apic_id_valid(apic_id)) {
232 pr_warn(PREFIX "x2apic entry ignored\n");
236 acpi_register_lapic(apic_id, processor->uid, enabled);
238 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
245 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
247 struct acpi_madt_local_apic *processor = NULL;
249 processor = (struct acpi_madt_local_apic *)header;
251 if (BAD_MADT_ENTRY(processor, end))
254 acpi_table_print_madt_entry(header);
256 /* Ignore invalid ID */
257 if (processor->id == 0xff)
261 * We need to register disabled CPU as well to permit
262 * counting disabled CPUs. This allows us to size
263 * cpus_possible_map more accurately, to permit
264 * to not preallocating memory for all NR_CPUS
265 * when we use CPU hotplug.
267 acpi_register_lapic(processor->id, /* APIC ID */
268 processor->processor_id, /* ACPI ID */
269 processor->lapic_flags & ACPI_MADT_ENABLED);
275 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
277 struct acpi_madt_local_sapic *processor = NULL;
279 processor = (struct acpi_madt_local_sapic *)header;
281 if (BAD_MADT_ENTRY(processor, end))
284 acpi_table_print_madt_entry(header);
286 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
287 processor->processor_id, /* ACPI ID */
288 processor->lapic_flags & ACPI_MADT_ENABLED);
294 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
295 const unsigned long end)
297 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
299 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
301 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
304 acpi_table_print_madt_entry(header);
306 acpi_lapic_addr = lapic_addr_ovr->address;
312 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
313 const unsigned long end)
315 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
317 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
319 if (BAD_MADT_ENTRY(x2apic_nmi, end))
322 acpi_table_print_madt_entry(header);
324 if (x2apic_nmi->lint != 1)
325 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
331 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
333 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
335 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
337 if (BAD_MADT_ENTRY(lapic_nmi, end))
340 acpi_table_print_madt_entry(header);
342 if (lapic_nmi->lint != 1)
343 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
348 #endif /*CONFIG_X86_LOCAL_APIC */
350 #ifdef CONFIG_X86_IO_APIC
353 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
354 u8 trigger, u32 gsi);
356 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
360 * Check bus_irq boundary.
362 if (bus_irq >= NR_IRQS_LEGACY) {
363 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
368 * TBD: This check is for faulty timer entries, where the override
369 * erroneously sets the trigger to level, resulting in a HUGE
370 * increase of timer interrupts!
372 if ((bus_irq == 0) && (trigger == 3))
375 if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
378 * Reset default identity mapping if gsi is also an legacy IRQ,
379 * otherwise there will be more than one entry with the same GSI
380 * and acpi_isa_irq_to_gsi() may give wrong result.
382 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
383 isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
384 isa_irq_to_gsi[bus_irq] = gsi;
387 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
390 #ifdef CONFIG_X86_MPPARSE
391 struct mpc_intsrc mp_irq;
392 struct pci_dev *pdev;
393 unsigned char number;
400 if (!dev || !dev_is_pci(dev))
403 pdev = to_pci_dev(dev);
404 number = pdev->bus->number;
407 /* print the entry should happen on mptable identically */
408 mp_irq.type = MP_INTSRC;
409 mp_irq.irqtype = mp_INT;
410 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
411 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
412 mp_irq.srcbus = number;
413 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
414 ioapic = mp_find_ioapic(gsi);
415 mp_irq.dstapic = mpc_ioapic_id(ioapic);
416 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
418 mp_save_irq(&mp_irq);
423 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
426 struct mpc_intsrc mp_irq;
429 /* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
430 ioapic = mp_find_ioapic(gsi);
432 pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
436 pin = mp_find_ioapic_pin(ioapic, gsi);
438 mp_irq.type = MP_INTSRC;
439 mp_irq.irqtype = mp_INT;
440 mp_irq.irqflag = (trigger << 2) | polarity;
441 mp_irq.srcbus = MP_ISA_BUS;
442 mp_irq.srcbusirq = bus_irq;
443 mp_irq.dstapic = mpc_ioapic_id(ioapic);
446 mp_save_irq(&mp_irq);
452 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
454 struct acpi_madt_io_apic *ioapic = NULL;
455 struct ioapic_domain_cfg cfg = {
456 .type = IOAPIC_DOMAIN_DYNAMIC,
457 .ops = &mp_ioapic_irqdomain_ops,
460 ioapic = (struct acpi_madt_io_apic *)header;
462 if (BAD_MADT_ENTRY(ioapic, end))
465 acpi_table_print_madt_entry(header);
467 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
468 if (ioapic->global_irq_base < nr_legacy_irqs())
469 cfg.type = IOAPIC_DOMAIN_LEGACY;
471 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
478 * Parse Interrupt Source Override for the ACPI SCI
480 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
482 if (trigger == 0) /* compatible SCI trigger is level */
485 if (polarity == 0) /* compatible SCI polarity is low */
488 /* Command-line over-ride via acpi_sci= */
489 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
490 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
492 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
493 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
495 if (bus_irq < NR_IRQS_LEGACY)
496 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
498 mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
500 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
503 * stash over-ride to indicate we've been here
504 * and for later update of acpi_gbl_FADT
506 acpi_sci_override_gsi = gsi;
511 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
512 const unsigned long end)
514 struct acpi_madt_interrupt_override *intsrc = NULL;
516 intsrc = (struct acpi_madt_interrupt_override *)header;
518 if (BAD_MADT_ENTRY(intsrc, end))
521 acpi_table_print_madt_entry(header);
523 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
524 acpi_sci_ioapic_setup(intsrc->source_irq,
525 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
526 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
531 if (intsrc->source_irq == 0) {
532 if (acpi_skip_timer_override) {
533 printk(PREFIX "BIOS IRQ0 override ignored.\n");
537 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
538 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
539 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
540 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
544 mp_override_legacy_irq(intsrc->source_irq,
545 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
546 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
553 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
555 struct acpi_madt_nmi_source *nmi_src = NULL;
557 nmi_src = (struct acpi_madt_nmi_source *)header;
559 if (BAD_MADT_ENTRY(nmi_src, end))
562 acpi_table_print_madt_entry(header);
564 /* TBD: Support nimsrc entries? */
569 #endif /* CONFIG_X86_IO_APIC */
572 * acpi_pic_sci_set_trigger()
574 * use ELCR to set PIC-mode trigger type for SCI
576 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
577 * it may require Edge Trigger -- use "acpi_sci=edge"
579 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
580 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
581 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
582 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
585 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
587 unsigned int mask = 1 << irq;
588 unsigned int old, new;
590 /* Real old ELCR mask */
591 old = inb(0x4d0) | (inb(0x4d1) << 8);
594 * If we use ACPI to set PCI IRQs, then we should clear ELCR
595 * since we will set it correctly as we enable the PCI irq
598 new = acpi_noirq ? old : 0;
601 * Update SCI information in the ELCR, it isn't in the PCI
605 case 1: /* Edge - clear */
608 case 3: /* Level - set */
616 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
618 outb(new >> 8, 0x4d1);
621 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
623 int rc, irq, trigger, polarity;
625 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
630 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
634 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
635 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
636 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
643 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
645 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
647 if (isa_irq < nr_legacy_irqs() &&
648 isa_irq_to_gsi[isa_irq] != INVALID_ACPI_IRQ) {
649 *gsi = isa_irq_to_gsi[isa_irq];
656 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
657 int trigger, int polarity)
661 * Make sure all (legacy) PCI IRQs are set as level-triggered.
663 if (trigger == ACPI_LEVEL_SENSITIVE)
664 elcr_set_level_irq(gsi);
670 #ifdef CONFIG_X86_LOCAL_APIC
671 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
672 int trigger, int polarity)
675 #ifdef CONFIG_X86_IO_APIC
677 struct irq_alloc_info info;
679 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
680 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
681 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
682 ioapic_set_alloc_attr(&info, node, trigger, polarity);
684 mutex_lock(&acpi_ioapic_lock);
685 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
686 /* Don't set up the ACPI SCI because it's already set up */
687 if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
688 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
689 mutex_unlock(&acpi_ioapic_lock);
695 static void acpi_unregister_gsi_ioapic(u32 gsi)
697 #ifdef CONFIG_X86_IO_APIC
700 mutex_lock(&acpi_ioapic_lock);
701 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
704 mutex_unlock(&acpi_ioapic_lock);
709 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
710 int trigger, int polarity) = acpi_register_gsi_pic;
711 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
713 #ifdef CONFIG_ACPI_SLEEP
714 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
716 int (*acpi_suspend_lowlevel)(void);
720 * success: return IRQ number (>=0)
721 * failure: return < 0
723 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
725 return __acpi_register_gsi(dev, gsi, trigger, polarity);
727 EXPORT_SYMBOL_GPL(acpi_register_gsi);
729 void acpi_unregister_gsi(u32 gsi)
731 if (__acpi_unregister_gsi)
732 __acpi_unregister_gsi(gsi);
734 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
736 #ifdef CONFIG_X86_LOCAL_APIC
737 static void __init acpi_set_irq_model_ioapic(void)
739 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
740 __acpi_register_gsi = acpi_register_gsi_ioapic;
741 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
747 * ACPI based hotplug support for CPU
749 #ifdef CONFIG_ACPI_HOTPLUG_CPU
750 #include <acpi/processor.h>
752 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
754 #ifdef CONFIG_ACPI_NUMA
757 nid = acpi_get_node(handle);
758 if (nid != NUMA_NO_NODE) {
759 set_apicid_to_node(physid, nid);
760 numa_set_node(cpu, nid);
766 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
771 cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
773 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
777 acpi_processor_set_pdc(handle);
778 acpi_map_cpu2node(handle, cpu, physid);
783 EXPORT_SYMBOL(acpi_map_cpu);
785 int acpi_unmap_cpu(int cpu)
787 #ifdef CONFIG_ACPI_NUMA
788 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
791 per_cpu(x86_cpu_to_apicid, cpu) = -1;
792 set_cpu_present(cpu, false);
797 EXPORT_SYMBOL(acpi_unmap_cpu);
798 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
800 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
803 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
806 struct ioapic_domain_cfg cfg = {
807 .type = IOAPIC_DOMAIN_DYNAMIC,
808 .ops = &mp_ioapic_irqdomain_ops,
811 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
813 unsigned long long uid;
816 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
818 if (ACPI_FAILURE(status)) {
819 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
822 ioapic_id = (int)uid;
825 mutex_lock(&acpi_ioapic_lock);
826 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
827 mutex_unlock(&acpi_ioapic_lock);
832 EXPORT_SYMBOL(acpi_register_ioapic);
834 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
838 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
839 mutex_lock(&acpi_ioapic_lock);
840 ret = mp_unregister_ioapic(gsi_base);
841 mutex_unlock(&acpi_ioapic_lock);
846 EXPORT_SYMBOL(acpi_unregister_ioapic);
849 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
850 * has been registered
851 * @handle: ACPI handle of the IOAPIC deivce
852 * @gsi_base: GSI base associated with the IOAPIC
854 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
855 * with acpi_register_ioapic()/acpi_unregister_ioapic().
857 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
861 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
862 mutex_lock(&acpi_ioapic_lock);
863 ret = mp_ioapic_registered(gsi_base);
864 mutex_unlock(&acpi_ioapic_lock);
870 static int __init acpi_parse_sbf(struct acpi_table_header *table)
872 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
874 sbf_port = sb->cmos_index; /* Save CMOS port */
879 #ifdef CONFIG_HPET_TIMER
880 #include <asm/hpet.h>
882 static struct resource *hpet_res __initdata;
884 static int __init acpi_parse_hpet(struct acpi_table_header *table)
886 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
888 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
889 printk(KERN_WARNING PREFIX "HPET timers must be located in "
894 hpet_address = hpet_tbl->address.address;
895 hpet_blockid = hpet_tbl->sequence;
898 * Some broken BIOSes advertise HPET at 0x0. We really do not
899 * want to allocate a resource there.
902 printk(KERN_WARNING PREFIX
903 "HPET id: %#x base: %#lx is invalid\n",
904 hpet_tbl->id, hpet_address);
909 * Some even more broken BIOSes advertise HPET at
910 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
913 if (hpet_address == 0xfed0000000000000UL) {
914 if (!hpet_force_user) {
915 printk(KERN_WARNING PREFIX "HPET id: %#x "
916 "base: 0xfed0000000000000 is bogus\n "
917 "try hpet=force on the kernel command line to "
918 "fix it up to 0xfed00000.\n", hpet_tbl->id);
922 printk(KERN_WARNING PREFIX
923 "HPET id: %#x base: 0xfed0000000000000 fixed up "
924 "to 0xfed00000.\n", hpet_tbl->id);
928 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
929 hpet_tbl->id, hpet_address);
932 * Allocate and initialize the HPET firmware resource for adding into
933 * the resource tree during the lateinit timeframe.
935 #define HPET_RESOURCE_NAME_SIZE 9
936 hpet_res = memblock_alloc(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE,
939 hpet_res->name = (void *)&hpet_res[1];
940 hpet_res->flags = IORESOURCE_MEM;
941 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
944 hpet_res->start = hpet_address;
945 hpet_res->end = hpet_address + (1 * 1024) - 1;
951 * hpet_insert_resource inserts the HPET resources used into the resource
954 static __init int hpet_insert_resource(void)
959 return insert_resource(&iomem_resource, hpet_res);
962 late_initcall(hpet_insert_resource);
965 #define acpi_parse_hpet NULL
968 static int __init acpi_parse_fadt(struct acpi_table_header *table)
970 if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
971 pr_debug("ACPI: no legacy devices present\n");
972 x86_platform.legacy.devices.pnpbios = 0;
975 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
976 !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
977 x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
978 pr_debug("ACPI: i8042 controller is absent\n");
979 x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
982 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
983 pr_debug("ACPI: not registering RTC platform device\n");
984 x86_platform.legacy.rtc = 0;
987 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
988 pr_debug("ACPI: probing for VGA not safe\n");
989 x86_platform.legacy.no_vga = 1;
992 #ifdef CONFIG_X86_PM_TIMER
993 /* detect the location of the ACPI PM Timer */
994 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
996 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
997 ACPI_ADR_SPACE_SYSTEM_IO)
1000 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
1002 * "X" fields are optional extensions to the original V1.0
1003 * fields, so we must selectively expand V1.0 fields if the
1004 * corresponding X field is zero.
1007 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1010 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1013 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
1019 #ifdef CONFIG_X86_LOCAL_APIC
1021 * Parse LAPIC entries in MADT
1022 * returns 0 on success, < 0 on error
1025 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
1029 if (!boot_cpu_has(X86_FEATURE_APIC))
1033 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1034 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1037 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1038 acpi_parse_lapic_addr_ovr, 0);
1040 printk(KERN_ERR PREFIX
1041 "Error parsing LAPIC address override entry\n");
1045 register_lapic_address(acpi_lapic_addr);
1050 static int __init acpi_parse_madt_lapic_entries(void)
1055 struct acpi_subtable_proc madt_proc[2];
1057 if (!boot_cpu_has(X86_FEATURE_APIC))
1060 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1061 acpi_parse_sapic, MAX_LOCAL_APIC);
1064 memset(madt_proc, 0, sizeof(madt_proc));
1065 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1066 madt_proc[0].handler = acpi_parse_lapic;
1067 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1068 madt_proc[1].handler = acpi_parse_x2apic;
1069 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1070 sizeof(struct acpi_table_madt),
1071 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1073 printk(KERN_ERR PREFIX
1074 "Error parsing LAPIC/X2APIC entries\n");
1078 count = madt_proc[0].count;
1079 x2count = madt_proc[1].count;
1081 if (!count && !x2count) {
1082 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1083 /* TBD: Cleanup to allow fallback to MPS */
1085 } else if (count < 0 || x2count < 0) {
1086 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1087 /* TBD: Cleanup to allow fallback to MPS */
1091 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1092 acpi_parse_x2apic_nmi, 0);
1093 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1094 acpi_parse_lapic_nmi, 0);
1095 if (count < 0 || x2count < 0) {
1096 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1097 /* TBD: Cleanup to allow fallback to MPS */
1102 #endif /* CONFIG_X86_LOCAL_APIC */
1104 #ifdef CONFIG_X86_IO_APIC
1105 static void __init mp_config_acpi_legacy_irqs(void)
1108 struct mpc_intsrc mp_irq;
1112 * Fabricate the legacy ISA bus (bus #31).
1114 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1116 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1117 pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());
1120 * Use the default configuration for the IRQs 0-15. Unless
1121 * overridden by (MADT) interrupt source override entries.
1123 for (i = 0; i < nr_legacy_irqs(); i++) {
1125 unsigned int dstapic;
1129 /* Locate the gsi that irq i maps to. */
1130 if (acpi_isa_irq_to_gsi(i, &gsi))
1134 * Locate the IOAPIC that manages the ISA IRQ.
1136 ioapic = mp_find_ioapic(gsi);
1139 pin = mp_find_ioapic_pin(ioapic, gsi);
1140 dstapic = mpc_ioapic_id(ioapic);
1142 for (idx = 0; idx < mp_irq_entries; idx++) {
1143 struct mpc_intsrc *irq = mp_irqs + idx;
1145 /* Do we already have a mapping for this ISA IRQ? */
1146 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1149 /* Do we already have a mapping for this IOAPIC pin */
1150 if (irq->dstapic == dstapic && irq->dstirq == pin)
1154 if (idx != mp_irq_entries) {
1155 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1156 continue; /* IRQ already used */
1159 mp_irq.type = MP_INTSRC;
1160 mp_irq.irqflag = 0; /* Conforming */
1161 mp_irq.srcbus = MP_ISA_BUS;
1162 mp_irq.dstapic = dstapic;
1163 mp_irq.irqtype = mp_INT;
1164 mp_irq.srcbusirq = i; /* Identity mapped */
1165 mp_irq.dstirq = pin;
1167 mp_save_irq(&mp_irq);
1172 * Parse IOAPIC related entries in MADT
1173 * returns 0 on success, < 0 on error
1175 static int __init acpi_parse_madt_ioapic_entries(void)
1180 * ACPI interpreter is required to complete interrupt setup,
1181 * so if it is off, don't enumerate the io-apics with ACPI.
1182 * If MPS is present, it will handle them,
1183 * otherwise the system will stay in PIC mode
1185 if (acpi_disabled || acpi_noirq)
1188 if (!boot_cpu_has(X86_FEATURE_APIC))
1192 * if "noapic" boot option, don't look for IO-APICs
1194 if (skip_ioapic_setup) {
1195 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1196 "due to 'noapic' option.\n");
1200 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1203 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1205 } else if (count < 0) {
1206 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1210 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1211 acpi_parse_int_src_ovr, nr_irqs);
1213 printk(KERN_ERR PREFIX
1214 "Error parsing interrupt source overrides entry\n");
1215 /* TBD: Cleanup to allow fallback to MPS */
1220 * If BIOS did not supply an INT_SRC_OVR for the SCI
1221 * pretend we got one so we can set the SCI flags.
1222 * But ignore setting up SCI on hardware reduced platforms.
1224 if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
1225 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1226 acpi_gbl_FADT.sci_interrupt);
1228 /* Fill in identity legacy mappings where no override */
1229 mp_config_acpi_legacy_irqs();
1231 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1232 acpi_parse_nmi_src, nr_irqs);
1234 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1235 /* TBD: Cleanup to allow fallback to MPS */
1242 static inline int acpi_parse_madt_ioapic_entries(void)
1246 #endif /* !CONFIG_X86_IO_APIC */
1248 static void __init early_acpi_process_madt(void)
1250 #ifdef CONFIG_X86_LOCAL_APIC
1253 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1256 * Parse MADT LAPIC entries
1258 error = early_acpi_parse_madt_lapic_addr_ovr();
1261 smp_found_config = 1;
1263 if (error == -EINVAL) {
1265 * Dell Precision Workstation 410, 610 come here.
1267 printk(KERN_ERR PREFIX
1268 "Invalid BIOS MADT, disabling ACPI\n");
1275 static void __init acpi_process_madt(void)
1277 #ifdef CONFIG_X86_LOCAL_APIC
1280 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1283 * Parse MADT LAPIC entries
1285 error = acpi_parse_madt_lapic_entries();
1290 * Parse MADT IO-APIC entries
1292 mutex_lock(&acpi_ioapic_lock);
1293 error = acpi_parse_madt_ioapic_entries();
1294 mutex_unlock(&acpi_ioapic_lock);
1296 acpi_set_irq_model_ioapic();
1298 smp_found_config = 1;
1301 if (error == -EINVAL) {
1303 * Dell Precision Workstation 410, 610 come here.
1305 printk(KERN_ERR PREFIX
1306 "Invalid BIOS MADT, disabling ACPI\n");
1311 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1312 * In the event an MPS table was found, forget it.
1313 * Boot with "acpi=off" to use MPS on such a system.
1315 if (smp_found_config) {
1316 printk(KERN_WARNING PREFIX
1317 "No APIC-table, disabling MPS\n");
1318 smp_found_config = 0;
1323 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1324 * processors, where MPS only supports physical.
1326 if (acpi_lapic && acpi_ioapic)
1327 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1329 else if (acpi_lapic)
1330 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1331 "configuration information\n");
1336 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1339 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1346 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1349 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1356 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1359 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1363 "Warning: DMI blacklist says broken, but acpi forced\n");
1369 * Force ignoring BIOS IRQ0 override
1371 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1373 if (!acpi_skip_timer_override) {
1374 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1376 acpi_skip_timer_override = 1;
1382 * ACPI offers an alternative platform interface model that removes
1383 * ACPI hardware requirements for platforms that do not implement
1384 * the PC Architecture.
1386 * We initialize the Hardware-reduced ACPI model here:
1388 void __init acpi_generic_reduced_hw_init(void)
1391 * Override x86_init functions and bypass legacy PIC in
1392 * hardware reduced ACPI mode.
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;
1399 static void __init acpi_reduced_hw_init(void)
1401 if (acpi_gbl_reduced_hardware)
1402 x86_init.acpi.reduced_hw_early_init();
1406 * If your system is blacklisted here, but you find that acpi=force
1407 * works for you, please contact linux-acpi@vger.kernel.org
1409 static const struct dmi_system_id acpi_dmi_table[] __initconst = {
1411 * Boxes that need ACPI disabled
1414 .callback = dmi_disable_acpi,
1415 .ident = "IBM Thinkpad",
1417 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1418 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1423 * Boxes that need ACPI PCI IRQ routing disabled
1426 .callback = disable_acpi_irq,
1427 .ident = "ASUS A7V",
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"),
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
1443 .callback = disable_acpi_irq,
1444 .ident = "IBM Thinkpad 600 Series 2645",
1446 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1447 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1451 .callback = disable_acpi_irq,
1452 .ident = "IBM Thinkpad 600 Series 2646",
1454 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1455 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1459 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1462 .callback = disable_acpi_pci,
1463 .ident = "ASUS PR-DLS",
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")
1473 .callback = disable_acpi_pci,
1474 .ident = "Acer TravelMate 36x Laptop",
1476 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1477 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1483 /* second table for DMI checks that should run after early-quirks */
1484 static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
1486 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1487 * which includes some code which overrides all temperature
1488 * trip points to 16C if the INTIN2 input of the I/O APIC
1489 * is enabled. This input is incorrectly designated the
1490 * ISA IRQ 0 via an interrupt source override even though
1491 * it is wired to the output of the master 8259A and INTIN0
1492 * is not connected at all. Force ignoring BIOS IRQ0
1493 * override in that cases.
1496 .callback = dmi_ignore_irq0_timer_override,
1497 .ident = "HP nx6115 laptop",
1499 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1500 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1504 .callback = dmi_ignore_irq0_timer_override,
1505 .ident = "HP NX6125 laptop",
1507 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1508 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1512 .callback = dmi_ignore_irq0_timer_override,
1513 .ident = "HP NX6325 laptop",
1515 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1516 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1520 .callback = dmi_ignore_irq0_timer_override,
1521 .ident = "HP 6715b laptop",
1523 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1524 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1528 .callback = dmi_ignore_irq0_timer_override,
1529 .ident = "FUJITSU SIEMENS",
1531 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1532 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1539 * acpi_boot_table_init() and acpi_boot_init()
1540 * called from setup_arch(), always.
1541 * 1. checksums all tables
1542 * 2. enumerates lapics
1543 * 3. enumerates io-apics
1545 * acpi_table_init() is separate to allow reading SRAT without
1546 * other side effects.
1548 * side effects of acpi_boot_init:
1549 * acpi_lapic = 1 if LAPIC found
1550 * acpi_ioapic = 1 if IOAPIC found
1551 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1552 * if acpi_blacklisted() acpi_disabled = 1;
1553 * acpi_irq_model=...
1557 void __init acpi_boot_table_init(void)
1559 dmi_check_system(acpi_dmi_table);
1562 * If acpi_disabled, bail out
1568 * Initialize the ACPI boot-time table parser.
1570 if (acpi_table_init()) {
1575 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1578 * blacklist may disable ACPI entirely
1580 if (acpi_blacklisted()) {
1582 printk(KERN_WARNING PREFIX "acpi=force override\n");
1584 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1591 int __init early_acpi_boot_init(void)
1594 * If acpi_disabled, bail out
1600 * Process the Multiple APIC Description Table (MADT), if present
1602 early_acpi_process_madt();
1605 * Hardware-reduced ACPI mode initialization:
1607 acpi_reduced_hw_init();
1612 int __init acpi_boot_init(void)
1614 /* those are executed after early-quirks are executed */
1615 dmi_check_system(acpi_dmi_table_late);
1618 * If acpi_disabled, bail out
1623 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1626 * set sci_int and PM timer address
1628 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1631 * Process the Multiple APIC Description Table (MADT), if present
1633 acpi_process_madt();
1635 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1636 if (IS_ENABLED(CONFIG_ACPI_BGRT))
1637 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1640 x86_init.pci.init = pci_acpi_init;
1642 /* Do not enable ACPI SPCR console by default */
1643 acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
1647 static int __init parse_acpi(char *arg)
1652 /* "acpi=off" disables both ACPI table parsing and interpreter */
1653 if (strcmp(arg, "off") == 0) {
1656 /* acpi=force to over-ride black-list */
1657 else if (strcmp(arg, "force") == 0) {
1661 /* acpi=strict disables out-of-spec workarounds */
1662 else if (strcmp(arg, "strict") == 0) {
1665 /* acpi=rsdt use RSDT instead of XSDT */
1666 else if (strcmp(arg, "rsdt") == 0) {
1667 acpi_gbl_do_not_use_xsdt = TRUE;
1669 /* "acpi=noirq" disables ACPI interrupt routing */
1670 else if (strcmp(arg, "noirq") == 0) {
1673 /* "acpi=copy_dsdt" copys DSDT */
1674 else if (strcmp(arg, "copy_dsdt") == 0) {
1675 acpi_gbl_copy_dsdt_locally = 1;
1677 /* "acpi=nocmcff" disables FF mode for corrected errors */
1678 else if (strcmp(arg, "nocmcff") == 0) {
1679 acpi_disable_cmcff = 1;
1681 /* Core will printk when we return error. */
1686 early_param("acpi", parse_acpi);
1688 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1689 static int __init parse_pci(char *arg)
1691 if (arg && strcmp(arg, "noacpi") == 0)
1695 early_param("pci", parse_pci);
1697 int __init acpi_mps_check(void)
1699 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1700 /* mptable code is not built-in*/
1701 if (acpi_disabled || acpi_noirq) {
1702 printk(KERN_WARNING "MPS support code is not built-in.\n"
1703 "Using acpi=off or acpi=noirq or pci=noacpi "
1704 "may have problem\n");
1711 #ifdef CONFIG_X86_IO_APIC
1712 static int __init parse_acpi_skip_timer_override(char *arg)
1714 acpi_skip_timer_override = 1;
1717 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1719 static int __init parse_acpi_use_timer_override(char *arg)
1721 acpi_use_timer_override = 1;
1724 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1725 #endif /* CONFIG_X86_IO_APIC */
1727 static int __init setup_acpi_sci(char *s)
1731 if (!strcmp(s, "edge"))
1732 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1733 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1734 else if (!strcmp(s, "level"))
1735 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1736 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1737 else if (!strcmp(s, "high"))
1738 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1739 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1740 else if (!strcmp(s, "low"))
1741 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1742 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1747 early_param("acpi_sci", setup_acpi_sci);
1749 int __acpi_acquire_global_lock(unsigned int *lock)
1751 unsigned int old, new, val;
1754 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1755 val = cmpxchg(lock, old, new);
1756 } while (unlikely (val != old));
1757 return (new < 3) ? -1 : 0;
1760 int __acpi_release_global_lock(unsigned int *lock)
1762 unsigned int old, new, val;
1766 val = cmpxchg(lock, old, new);
1767 } while (unlikely (val != old));
1771 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1773 e820__range_add(addr, size, E820_TYPE_ACPI);
1774 e820__update_table_print();
1777 u64 x86_default_get_root_pointer(void)
1779 return boot_params.hdr.acpi_rsdp_addr;