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/bootmem.h>
36 #include <linux/ioport.h>
37 #include <linux/pci.h>
38 #include <linux/efi-bgrt.h>
40 #include <asm/e820/api.h>
41 #include <asm/irqdomain.h>
42 #include <asm/pci_x86.h>
43 #include <asm/pgtable.h>
44 #include <asm/io_apic.h>
47 #include <asm/mpspec.h>
49 #include <asm/i8259.h>
51 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
52 static int __initdata acpi_force = 0;
54 EXPORT_SYMBOL(acpi_disabled);
57 # include <asm/proto.h>
60 #define PREFIX "ACPI: "
62 int acpi_noirq; /* skip ACPI IRQ initialization */
63 int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
64 EXPORT_SYMBOL(acpi_pci_disabled);
69 int acpi_disable_cmcff;
71 u8 acpi_sci_flags __initdata;
72 int acpi_sci_override_gsi __initdata;
73 int acpi_skip_timer_override __initdata;
74 int acpi_use_timer_override __initdata;
75 int acpi_fix_pin2_polarity __initdata;
77 #ifdef CONFIG_X86_LOCAL_APIC
78 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
81 #ifdef CONFIG_X86_IO_APIC
83 * Locks related to IOAPIC hotplug
85 * ->device_hotplug_lock
88 * Interrupt mapping side:
93 static DEFINE_MUTEX(acpi_ioapic_lock);
96 /* --------------------------------------------------------------------------
97 Boot-time Configuration
98 -------------------------------------------------------------------------- */
101 * The default interrupt routing model is PIC (8259). This gets
102 * overridden if IOAPICs are enumerated (below).
104 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
108 * ISA irqs by default are the first 16 gsis but can be
109 * any gsi as specified by an interrupt source override.
111 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
112 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
115 #define ACPI_INVALID_GSI INT_MIN
118 * This is just a simple wrapper around early_ioremap(),
119 * with sanity checks for phys == 0 and size == 0.
121 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
127 return early_ioremap(phys, size);
130 void __init __acpi_unmap_table(char *map, unsigned long size)
135 early_iounmap(map, size);
138 #ifdef CONFIG_X86_LOCAL_APIC
139 static int __init acpi_parse_madt(struct acpi_table_header *table)
141 struct acpi_table_madt *madt = NULL;
143 if (!boot_cpu_has(X86_FEATURE_APIC))
146 madt = (struct acpi_table_madt *)table;
148 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
153 acpi_lapic_addr = (u64) madt->address;
155 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
159 default_acpi_madt_oem_check(madt->header.oem_id,
160 madt->header.oem_table_id);
166 * acpi_register_lapic - register a local apic and generates a logic cpu number
167 * @id: local apic id to register
168 * @acpiid: ACPI id to register
169 * @enabled: this cpu is enabled or not
171 * Returns the logic cpu number which maps to the local apic
173 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
175 unsigned int ver = 0;
178 if (id >= MAX_LOCAL_APIC) {
179 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
188 if (boot_cpu_physical_apicid != -1U)
189 ver = boot_cpu_apic_version;
191 cpu = generic_processor_info(id, ver);
193 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
199 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
201 struct acpi_madt_local_x2apic *processor = NULL;
205 processor = (struct acpi_madt_local_x2apic *)header;
207 if (BAD_MADT_ENTRY(processor, end))
210 acpi_table_print_madt_entry(header);
212 apic_id = processor->local_apic_id;
213 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
214 #ifdef CONFIG_X86_X2APIC
216 * We need to register disabled CPU as well to permit
217 * counting disabled CPUs. This allows us to size
218 * cpus_possible_map more accurately, to permit
219 * to not preallocating memory for all NR_CPUS
220 * when we use CPU hotplug.
222 if (!apic->apic_id_valid(apic_id) && enabled)
223 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
225 acpi_register_lapic(apic_id, processor->uid, enabled);
227 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
234 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
236 struct acpi_madt_local_apic *processor = NULL;
238 processor = (struct acpi_madt_local_apic *)header;
240 if (BAD_MADT_ENTRY(processor, end))
243 acpi_table_print_madt_entry(header);
245 /* Ignore invalid ID */
246 if (processor->id == 0xff)
250 * We need to register disabled CPU as well to permit
251 * counting disabled CPUs. This allows us to size
252 * cpus_possible_map more accurately, to permit
253 * to not preallocating memory for all NR_CPUS
254 * when we use CPU hotplug.
256 acpi_register_lapic(processor->id, /* APIC ID */
257 processor->processor_id, /* ACPI ID */
258 processor->lapic_flags & ACPI_MADT_ENABLED);
264 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
266 struct acpi_madt_local_sapic *processor = NULL;
268 processor = (struct acpi_madt_local_sapic *)header;
270 if (BAD_MADT_ENTRY(processor, end))
273 acpi_table_print_madt_entry(header);
275 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
276 processor->processor_id, /* ACPI ID */
277 processor->lapic_flags & ACPI_MADT_ENABLED);
283 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
284 const unsigned long end)
286 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
288 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
290 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
293 acpi_table_print_madt_entry(header);
295 acpi_lapic_addr = lapic_addr_ovr->address;
301 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
302 const unsigned long end)
304 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
306 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
308 if (BAD_MADT_ENTRY(x2apic_nmi, end))
311 acpi_table_print_madt_entry(header);
313 if (x2apic_nmi->lint != 1)
314 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
320 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
322 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
324 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
326 if (BAD_MADT_ENTRY(lapic_nmi, end))
329 acpi_table_print_madt_entry(header);
331 if (lapic_nmi->lint != 1)
332 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
337 #endif /*CONFIG_X86_LOCAL_APIC */
339 #ifdef CONFIG_X86_IO_APIC
342 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
347 struct mpc_intsrc mp_irq;
350 * Check bus_irq boundary.
352 if (bus_irq >= NR_IRQS_LEGACY) {
353 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
358 * Convert 'gsi' to 'ioapic.pin'.
360 ioapic = mp_find_ioapic(gsi);
363 pin = mp_find_ioapic_pin(ioapic, gsi);
366 * TBD: This check is for faulty timer entries, where the override
367 * erroneously sets the trigger to level, resulting in a HUGE
368 * increase of timer interrupts!
370 if ((bus_irq == 0) && (trigger == 3))
373 mp_irq.type = MP_INTSRC;
374 mp_irq.irqtype = mp_INT;
375 mp_irq.irqflag = (trigger << 2) | polarity;
376 mp_irq.srcbus = MP_ISA_BUS;
377 mp_irq.srcbusirq = bus_irq; /* IRQ */
378 mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
379 mp_irq.dstirq = pin; /* INTIN# */
381 mp_save_irq(&mp_irq);
384 * Reset default identity mapping if gsi is also an legacy IRQ,
385 * otherwise there will be more than one entry with the same GSI
386 * and acpi_isa_irq_to_gsi() may give wrong result.
388 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
389 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
390 isa_irq_to_gsi[bus_irq] = gsi;
393 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
396 #ifdef CONFIG_X86_MPPARSE
397 struct mpc_intsrc mp_irq;
398 struct pci_dev *pdev;
399 unsigned char number;
406 if (!dev || !dev_is_pci(dev))
409 pdev = to_pci_dev(dev);
410 number = pdev->bus->number;
413 /* print the entry should happen on mptable identically */
414 mp_irq.type = MP_INTSRC;
415 mp_irq.irqtype = mp_INT;
416 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
417 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
418 mp_irq.srcbus = number;
419 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
420 ioapic = mp_find_ioapic(gsi);
421 mp_irq.dstapic = mpc_ioapic_id(ioapic);
422 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
424 mp_save_irq(&mp_irq);
430 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
432 struct acpi_madt_io_apic *ioapic = NULL;
433 struct ioapic_domain_cfg cfg = {
434 .type = IOAPIC_DOMAIN_DYNAMIC,
435 .ops = &mp_ioapic_irqdomain_ops,
438 ioapic = (struct acpi_madt_io_apic *)header;
440 if (BAD_MADT_ENTRY(ioapic, end))
443 acpi_table_print_madt_entry(header);
445 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
446 if (ioapic->global_irq_base < nr_legacy_irqs())
447 cfg.type = IOAPIC_DOMAIN_LEGACY;
449 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
456 * Parse Interrupt Source Override for the ACPI SCI
458 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
460 if (trigger == 0) /* compatible SCI trigger is level */
463 if (polarity == 0) /* compatible SCI polarity is low */
466 /* Command-line over-ride via acpi_sci= */
467 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
468 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
470 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
471 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
473 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
474 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
477 * stash over-ride to indicate we've been here
478 * and for later update of acpi_gbl_FADT
480 acpi_sci_override_gsi = gsi;
485 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
486 const unsigned long end)
488 struct acpi_madt_interrupt_override *intsrc = NULL;
490 intsrc = (struct acpi_madt_interrupt_override *)header;
492 if (BAD_MADT_ENTRY(intsrc, end))
495 acpi_table_print_madt_entry(header);
497 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
498 acpi_sci_ioapic_setup(intsrc->source_irq,
499 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
500 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
505 if (intsrc->source_irq == 0) {
506 if (acpi_skip_timer_override) {
507 printk(PREFIX "BIOS IRQ0 override ignored.\n");
511 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
512 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
513 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
514 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
518 mp_override_legacy_irq(intsrc->source_irq,
519 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
520 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
527 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
529 struct acpi_madt_nmi_source *nmi_src = NULL;
531 nmi_src = (struct acpi_madt_nmi_source *)header;
533 if (BAD_MADT_ENTRY(nmi_src, end))
536 acpi_table_print_madt_entry(header);
538 /* TBD: Support nimsrc entries? */
543 #endif /* CONFIG_X86_IO_APIC */
546 * acpi_pic_sci_set_trigger()
548 * use ELCR to set PIC-mode trigger type for SCI
550 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
551 * it may require Edge Trigger -- use "acpi_sci=edge"
553 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
554 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
555 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
556 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
559 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
561 unsigned int mask = 1 << irq;
562 unsigned int old, new;
564 /* Real old ELCR mask */
565 old = inb(0x4d0) | (inb(0x4d1) << 8);
568 * If we use ACPI to set PCI IRQs, then we should clear ELCR
569 * since we will set it correctly as we enable the PCI irq
572 new = acpi_noirq ? old : 0;
575 * Update SCI information in the ELCR, it isn't in the PCI
579 case 1: /* Edge - clear */
582 case 3: /* Level - set */
590 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
592 outb(new >> 8, 0x4d1);
595 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
597 int rc, irq, trigger, polarity;
599 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
604 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
606 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
607 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
608 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
617 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
619 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
621 if (isa_irq < nr_legacy_irqs() &&
622 isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
623 *gsi = isa_irq_to_gsi[isa_irq];
630 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
631 int trigger, int polarity)
635 * Make sure all (legacy) PCI IRQs are set as level-triggered.
637 if (trigger == ACPI_LEVEL_SENSITIVE)
638 elcr_set_level_irq(gsi);
644 #ifdef CONFIG_X86_LOCAL_APIC
645 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
646 int trigger, int polarity)
649 #ifdef CONFIG_X86_IO_APIC
651 struct irq_alloc_info info;
653 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
654 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
655 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
656 ioapic_set_alloc_attr(&info, node, trigger, polarity);
658 mutex_lock(&acpi_ioapic_lock);
659 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
660 /* Don't set up the ACPI SCI because it's already set up */
661 if (irq >= 0 && enable_update_mptable &&
662 acpi_gbl_FADT.sci_interrupt != gsi)
663 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
664 mutex_unlock(&acpi_ioapic_lock);
670 static void acpi_unregister_gsi_ioapic(u32 gsi)
672 #ifdef CONFIG_X86_IO_APIC
675 mutex_lock(&acpi_ioapic_lock);
676 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
679 mutex_unlock(&acpi_ioapic_lock);
684 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
685 int trigger, int polarity) = acpi_register_gsi_pic;
686 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
688 #ifdef CONFIG_ACPI_SLEEP
689 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
691 int (*acpi_suspend_lowlevel)(void);
695 * success: return IRQ number (>=0)
696 * failure: return < 0
698 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
700 return __acpi_register_gsi(dev, gsi, trigger, polarity);
702 EXPORT_SYMBOL_GPL(acpi_register_gsi);
704 void acpi_unregister_gsi(u32 gsi)
706 if (__acpi_unregister_gsi)
707 __acpi_unregister_gsi(gsi);
709 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
711 #ifdef CONFIG_X86_LOCAL_APIC
712 static void __init acpi_set_irq_model_ioapic(void)
714 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
715 __acpi_register_gsi = acpi_register_gsi_ioapic;
716 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
722 * ACPI based hotplug support for CPU
724 #ifdef CONFIG_ACPI_HOTPLUG_CPU
725 #include <acpi/processor.h>
727 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
729 #ifdef CONFIG_ACPI_NUMA
732 nid = acpi_get_node(handle);
733 if (nid != NUMA_NO_NODE) {
734 set_apicid_to_node(physid, nid);
735 numa_set_node(cpu, nid);
741 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
746 cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
748 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
752 acpi_processor_set_pdc(handle);
753 acpi_map_cpu2node(handle, cpu, physid);
758 EXPORT_SYMBOL(acpi_map_cpu);
760 int acpi_unmap_cpu(int cpu)
762 #ifdef CONFIG_ACPI_NUMA
763 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
766 per_cpu(x86_cpu_to_apicid, cpu) = -1;
767 set_cpu_present(cpu, false);
772 EXPORT_SYMBOL(acpi_unmap_cpu);
773 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
775 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
778 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
781 struct ioapic_domain_cfg cfg = {
782 .type = IOAPIC_DOMAIN_DYNAMIC,
783 .ops = &mp_ioapic_irqdomain_ops,
786 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
788 unsigned long long uid;
791 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
793 if (ACPI_FAILURE(status)) {
794 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
797 ioapic_id = (int)uid;
800 mutex_lock(&acpi_ioapic_lock);
801 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
802 mutex_unlock(&acpi_ioapic_lock);
807 EXPORT_SYMBOL(acpi_register_ioapic);
809 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
813 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
814 mutex_lock(&acpi_ioapic_lock);
815 ret = mp_unregister_ioapic(gsi_base);
816 mutex_unlock(&acpi_ioapic_lock);
821 EXPORT_SYMBOL(acpi_unregister_ioapic);
824 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
825 * has been registered
826 * @handle: ACPI handle of the IOAPIC deivce
827 * @gsi_base: GSI base associated with the IOAPIC
829 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
830 * with acpi_register_ioapic()/acpi_unregister_ioapic().
832 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
836 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
837 mutex_lock(&acpi_ioapic_lock);
838 ret = mp_ioapic_registered(gsi_base);
839 mutex_unlock(&acpi_ioapic_lock);
845 static int __init acpi_parse_sbf(struct acpi_table_header *table)
847 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
849 sbf_port = sb->cmos_index; /* Save CMOS port */
854 #ifdef CONFIG_HPET_TIMER
855 #include <asm/hpet.h>
857 static struct resource *hpet_res __initdata;
859 static int __init acpi_parse_hpet(struct acpi_table_header *table)
861 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
863 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
864 printk(KERN_WARNING PREFIX "HPET timers must be located in "
869 hpet_address = hpet_tbl->address.address;
870 hpet_blockid = hpet_tbl->sequence;
873 * Some broken BIOSes advertise HPET at 0x0. We really do not
874 * want to allocate a resource there.
877 printk(KERN_WARNING PREFIX
878 "HPET id: %#x base: %#lx is invalid\n",
879 hpet_tbl->id, hpet_address);
884 * Some even more broken BIOSes advertise HPET at
885 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
888 if (hpet_address == 0xfed0000000000000UL) {
889 if (!hpet_force_user) {
890 printk(KERN_WARNING PREFIX "HPET id: %#x "
891 "base: 0xfed0000000000000 is bogus\n "
892 "try hpet=force on the kernel command line to "
893 "fix it up to 0xfed00000.\n", hpet_tbl->id);
897 printk(KERN_WARNING PREFIX
898 "HPET id: %#x base: 0xfed0000000000000 fixed up "
899 "to 0xfed00000.\n", hpet_tbl->id);
903 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
904 hpet_tbl->id, hpet_address);
907 * Allocate and initialize the HPET firmware resource for adding into
908 * the resource tree during the lateinit timeframe.
910 #define HPET_RESOURCE_NAME_SIZE 9
911 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
913 hpet_res->name = (void *)&hpet_res[1];
914 hpet_res->flags = IORESOURCE_MEM;
915 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
918 hpet_res->start = hpet_address;
919 hpet_res->end = hpet_address + (1 * 1024) - 1;
925 * hpet_insert_resource inserts the HPET resources used into the resource
928 static __init int hpet_insert_resource(void)
933 return insert_resource(&iomem_resource, hpet_res);
936 late_initcall(hpet_insert_resource);
939 #define acpi_parse_hpet NULL
942 static int __init acpi_parse_fadt(struct acpi_table_header *table)
944 if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
945 pr_debug("ACPI: no legacy devices present\n");
946 x86_platform.legacy.devices.pnpbios = 0;
949 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
950 !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
951 x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
952 pr_debug("ACPI: i8042 controller is absent\n");
953 x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
956 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
957 pr_debug("ACPI: not registering RTC platform device\n");
958 x86_platform.legacy.rtc = 0;
961 #ifdef CONFIG_X86_PM_TIMER
962 /* detect the location of the ACPI PM Timer */
963 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
965 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
966 ACPI_ADR_SPACE_SYSTEM_IO)
969 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
971 * "X" fields are optional extensions to the original V1.0
972 * fields, so we must selectively expand V1.0 fields if the
973 * corresponding X field is zero.
976 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
979 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
982 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
988 #ifdef CONFIG_X86_LOCAL_APIC
990 * Parse LAPIC entries in MADT
991 * returns 0 on success, < 0 on error
994 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
998 if (!boot_cpu_has(X86_FEATURE_APIC))
1002 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1003 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1006 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1007 acpi_parse_lapic_addr_ovr, 0);
1009 printk(KERN_ERR PREFIX
1010 "Error parsing LAPIC address override entry\n");
1014 register_lapic_address(acpi_lapic_addr);
1019 static int __init acpi_parse_madt_lapic_entries(void)
1024 struct acpi_subtable_proc madt_proc[2];
1026 if (!boot_cpu_has(X86_FEATURE_APIC))
1029 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1030 acpi_parse_sapic, MAX_LOCAL_APIC);
1033 memset(madt_proc, 0, sizeof(madt_proc));
1034 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1035 madt_proc[0].handler = acpi_parse_lapic;
1036 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1037 madt_proc[1].handler = acpi_parse_x2apic;
1038 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1039 sizeof(struct acpi_table_madt),
1040 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1042 printk(KERN_ERR PREFIX
1043 "Error parsing LAPIC/X2APIC entries\n");
1047 count = madt_proc[0].count;
1048 x2count = madt_proc[1].count;
1050 if (!count && !x2count) {
1051 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1052 /* TBD: Cleanup to allow fallback to MPS */
1054 } else if (count < 0 || x2count < 0) {
1055 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1056 /* TBD: Cleanup to allow fallback to MPS */
1060 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1061 acpi_parse_x2apic_nmi, 0);
1062 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1063 acpi_parse_lapic_nmi, 0);
1064 if (count < 0 || x2count < 0) {
1065 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1066 /* TBD: Cleanup to allow fallback to MPS */
1071 #endif /* CONFIG_X86_LOCAL_APIC */
1073 #ifdef CONFIG_X86_IO_APIC
1074 static void __init mp_config_acpi_legacy_irqs(void)
1077 struct mpc_intsrc mp_irq;
1081 * Fabricate the legacy ISA bus (bus #31).
1083 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1085 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1086 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1089 * Use the default configuration for the IRQs 0-15. Unless
1090 * overridden by (MADT) interrupt source override entries.
1092 for (i = 0; i < nr_legacy_irqs(); i++) {
1094 unsigned int dstapic;
1098 /* Locate the gsi that irq i maps to. */
1099 if (acpi_isa_irq_to_gsi(i, &gsi))
1103 * Locate the IOAPIC that manages the ISA IRQ.
1105 ioapic = mp_find_ioapic(gsi);
1108 pin = mp_find_ioapic_pin(ioapic, gsi);
1109 dstapic = mpc_ioapic_id(ioapic);
1111 for (idx = 0; idx < mp_irq_entries; idx++) {
1112 struct mpc_intsrc *irq = mp_irqs + idx;
1114 /* Do we already have a mapping for this ISA IRQ? */
1115 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1118 /* Do we already have a mapping for this IOAPIC pin */
1119 if (irq->dstapic == dstapic && irq->dstirq == pin)
1123 if (idx != mp_irq_entries) {
1124 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1125 continue; /* IRQ already used */
1128 mp_irq.type = MP_INTSRC;
1129 mp_irq.irqflag = 0; /* Conforming */
1130 mp_irq.srcbus = MP_ISA_BUS;
1131 mp_irq.dstapic = dstapic;
1132 mp_irq.irqtype = mp_INT;
1133 mp_irq.srcbusirq = i; /* Identity mapped */
1134 mp_irq.dstirq = pin;
1136 mp_save_irq(&mp_irq);
1141 * Parse IOAPIC related entries in MADT
1142 * returns 0 on success, < 0 on error
1144 static int __init acpi_parse_madt_ioapic_entries(void)
1149 * ACPI interpreter is required to complete interrupt setup,
1150 * so if it is off, don't enumerate the io-apics with ACPI.
1151 * If MPS is present, it will handle them,
1152 * otherwise the system will stay in PIC mode
1154 if (acpi_disabled || acpi_noirq)
1157 if (!boot_cpu_has(X86_FEATURE_APIC))
1161 * if "noapic" boot option, don't look for IO-APICs
1163 if (skip_ioapic_setup) {
1164 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1165 "due to 'noapic' option.\n");
1169 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1172 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1174 } else if (count < 0) {
1175 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1179 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1180 acpi_parse_int_src_ovr, nr_irqs);
1182 printk(KERN_ERR PREFIX
1183 "Error parsing interrupt source overrides entry\n");
1184 /* TBD: Cleanup to allow fallback to MPS */
1189 * If BIOS did not supply an INT_SRC_OVR for the SCI
1190 * pretend we got one so we can set the SCI flags.
1192 if (!acpi_sci_override_gsi)
1193 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1194 acpi_gbl_FADT.sci_interrupt);
1196 /* Fill in identity legacy mappings where no override */
1197 mp_config_acpi_legacy_irqs();
1199 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1200 acpi_parse_nmi_src, nr_irqs);
1202 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1203 /* TBD: Cleanup to allow fallback to MPS */
1210 static inline int acpi_parse_madt_ioapic_entries(void)
1214 #endif /* !CONFIG_X86_IO_APIC */
1216 static void __init early_acpi_process_madt(void)
1218 #ifdef CONFIG_X86_LOCAL_APIC
1221 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1224 * Parse MADT LAPIC entries
1226 error = early_acpi_parse_madt_lapic_addr_ovr();
1229 smp_found_config = 1;
1231 if (error == -EINVAL) {
1233 * Dell Precision Workstation 410, 610 come here.
1235 printk(KERN_ERR PREFIX
1236 "Invalid BIOS MADT, disabling ACPI\n");
1243 static void __init acpi_process_madt(void)
1245 #ifdef CONFIG_X86_LOCAL_APIC
1248 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1251 * Parse MADT LAPIC entries
1253 error = acpi_parse_madt_lapic_entries();
1258 * Parse MADT IO-APIC entries
1260 mutex_lock(&acpi_ioapic_lock);
1261 error = acpi_parse_madt_ioapic_entries();
1262 mutex_unlock(&acpi_ioapic_lock);
1264 acpi_set_irq_model_ioapic();
1266 smp_found_config = 1;
1269 if (error == -EINVAL) {
1271 * Dell Precision Workstation 410, 610 come here.
1273 printk(KERN_ERR PREFIX
1274 "Invalid BIOS MADT, disabling ACPI\n");
1279 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1280 * In the event an MPS table was found, forget it.
1281 * Boot with "acpi=off" to use MPS on such a system.
1283 if (smp_found_config) {
1284 printk(KERN_WARNING PREFIX
1285 "No APIC-table, disabling MPS\n");
1286 smp_found_config = 0;
1291 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1292 * processors, where MPS only supports physical.
1294 if (acpi_lapic && acpi_ioapic)
1295 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1297 else if (acpi_lapic)
1298 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1299 "configuration information\n");
1304 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1307 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1314 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1317 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1324 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1327 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1331 "Warning: DMI blacklist says broken, but acpi forced\n");
1337 * Force ignoring BIOS IRQ0 override
1339 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1341 if (!acpi_skip_timer_override) {
1342 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1344 acpi_skip_timer_override = 1;
1350 * ACPI offers an alternative platform interface model that removes
1351 * ACPI hardware requirements for platforms that do not implement
1352 * the PC Architecture.
1354 * We initialize the Hardware-reduced ACPI model here:
1356 static void __init acpi_reduced_hw_init(void)
1358 if (acpi_gbl_reduced_hardware) {
1360 * Override x86_init functions and bypass legacy pic
1361 * in Hardware-reduced ACPI mode
1363 x86_init.timers.timer_init = x86_init_noop;
1364 x86_init.irqs.pre_vector_init = x86_init_noop;
1365 legacy_pic = &null_legacy_pic;
1370 * If your system is blacklisted here, but you find that acpi=force
1371 * works for you, please contact linux-acpi@vger.kernel.org
1373 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1375 * Boxes that need ACPI disabled
1378 .callback = dmi_disable_acpi,
1379 .ident = "IBM Thinkpad",
1381 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1382 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1387 * Boxes that need ACPI PCI IRQ routing disabled
1390 .callback = disable_acpi_irq,
1391 .ident = "ASUS A7V",
1393 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1394 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1395 /* newer BIOS, Revision 1011, does work */
1396 DMI_MATCH(DMI_BIOS_VERSION,
1397 "ASUS A7V ACPI BIOS Revision 1007"),
1402 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1403 * for LPC bridge, which is needed for the PCI
1404 * interrupt links to work. DSDT fix is in bug 5966.
1405 * 2645, 2646 model numbers are shared with 600/600E/600X
1407 .callback = disable_acpi_irq,
1408 .ident = "IBM Thinkpad 600 Series 2645",
1410 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1411 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1415 .callback = disable_acpi_irq,
1416 .ident = "IBM Thinkpad 600 Series 2646",
1418 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1419 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1423 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1426 .callback = disable_acpi_pci,
1427 .ident = "ASUS PR-DLS",
1429 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1430 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1431 DMI_MATCH(DMI_BIOS_VERSION,
1432 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1433 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1437 .callback = disable_acpi_pci,
1438 .ident = "Acer TravelMate 36x Laptop",
1440 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1441 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1447 /* second table for DMI checks that should run after early-quirks */
1448 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1450 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1451 * which includes some code which overrides all temperature
1452 * trip points to 16C if the INTIN2 input of the I/O APIC
1453 * is enabled. This input is incorrectly designated the
1454 * ISA IRQ 0 via an interrupt source override even though
1455 * it is wired to the output of the master 8259A and INTIN0
1456 * is not connected at all. Force ignoring BIOS IRQ0
1457 * override in that cases.
1460 .callback = dmi_ignore_irq0_timer_override,
1461 .ident = "HP nx6115 laptop",
1463 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1464 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1468 .callback = dmi_ignore_irq0_timer_override,
1469 .ident = "HP NX6125 laptop",
1471 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1472 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1476 .callback = dmi_ignore_irq0_timer_override,
1477 .ident = "HP NX6325 laptop",
1479 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1480 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1484 .callback = dmi_ignore_irq0_timer_override,
1485 .ident = "HP 6715b laptop",
1487 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1488 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1492 .callback = dmi_ignore_irq0_timer_override,
1493 .ident = "FUJITSU SIEMENS",
1495 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1496 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1503 * acpi_boot_table_init() and acpi_boot_init()
1504 * called from setup_arch(), always.
1505 * 1. checksums all tables
1506 * 2. enumerates lapics
1507 * 3. enumerates io-apics
1509 * acpi_table_init() is separate to allow reading SRAT without
1510 * other side effects.
1512 * side effects of acpi_boot_init:
1513 * acpi_lapic = 1 if LAPIC found
1514 * acpi_ioapic = 1 if IOAPIC found
1515 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1516 * if acpi_blacklisted() acpi_disabled = 1;
1517 * acpi_irq_model=...
1521 void __init acpi_boot_table_init(void)
1523 dmi_check_system(acpi_dmi_table);
1526 * If acpi_disabled, bail out
1532 * Initialize the ACPI boot-time table parser.
1534 if (acpi_table_init()) {
1539 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1542 * blacklist may disable ACPI entirely
1544 if (acpi_blacklisted()) {
1546 printk(KERN_WARNING PREFIX "acpi=force override\n");
1548 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1555 int __init early_acpi_boot_init(void)
1558 * If acpi_disabled, bail out
1564 * Process the Multiple APIC Description Table (MADT), if present
1566 early_acpi_process_madt();
1569 * Hardware-reduced ACPI mode initialization:
1571 acpi_reduced_hw_init();
1576 int __init acpi_boot_init(void)
1578 /* those are executed after early-quirks are executed */
1579 dmi_check_system(acpi_dmi_table_late);
1582 * If acpi_disabled, bail out
1587 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1590 * set sci_int and PM timer address
1592 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1595 * Process the Multiple APIC Description Table (MADT), if present
1597 acpi_process_madt();
1599 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1600 if (IS_ENABLED(CONFIG_ACPI_BGRT))
1601 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1604 x86_init.pci.init = pci_acpi_init;
1609 static int __init parse_acpi(char *arg)
1614 /* "acpi=off" disables both ACPI table parsing and interpreter */
1615 if (strcmp(arg, "off") == 0) {
1618 /* acpi=force to over-ride black-list */
1619 else if (strcmp(arg, "force") == 0) {
1623 /* acpi=strict disables out-of-spec workarounds */
1624 else if (strcmp(arg, "strict") == 0) {
1627 /* acpi=rsdt use RSDT instead of XSDT */
1628 else if (strcmp(arg, "rsdt") == 0) {
1629 acpi_gbl_do_not_use_xsdt = TRUE;
1631 /* "acpi=noirq" disables ACPI interrupt routing */
1632 else if (strcmp(arg, "noirq") == 0) {
1635 /* "acpi=copy_dsdt" copys DSDT */
1636 else if (strcmp(arg, "copy_dsdt") == 0) {
1637 acpi_gbl_copy_dsdt_locally = 1;
1639 /* "acpi=nocmcff" disables FF mode for corrected errors */
1640 else if (strcmp(arg, "nocmcff") == 0) {
1641 acpi_disable_cmcff = 1;
1643 /* Core will printk when we return error. */
1648 early_param("acpi", parse_acpi);
1650 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1651 static int __init parse_pci(char *arg)
1653 if (arg && strcmp(arg, "noacpi") == 0)
1657 early_param("pci", parse_pci);
1659 int __init acpi_mps_check(void)
1661 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1662 /* mptable code is not built-in*/
1663 if (acpi_disabled || acpi_noirq) {
1664 printk(KERN_WARNING "MPS support code is not built-in.\n"
1665 "Using acpi=off or acpi=noirq or pci=noacpi "
1666 "may have problem\n");
1673 #ifdef CONFIG_X86_IO_APIC
1674 static int __init parse_acpi_skip_timer_override(char *arg)
1676 acpi_skip_timer_override = 1;
1679 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1681 static int __init parse_acpi_use_timer_override(char *arg)
1683 acpi_use_timer_override = 1;
1686 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1687 #endif /* CONFIG_X86_IO_APIC */
1689 static int __init setup_acpi_sci(char *s)
1693 if (!strcmp(s, "edge"))
1694 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1695 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1696 else if (!strcmp(s, "level"))
1697 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1698 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1699 else if (!strcmp(s, "high"))
1700 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1701 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1702 else if (!strcmp(s, "low"))
1703 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1704 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1709 early_param("acpi_sci", setup_acpi_sci);
1711 int __acpi_acquire_global_lock(unsigned int *lock)
1713 unsigned int old, new, val;
1716 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1717 val = cmpxchg(lock, old, new);
1718 } while (unlikely (val != old));
1719 return (new < 3) ? -1 : 0;
1722 int __acpi_release_global_lock(unsigned int *lock)
1724 unsigned int old, new, val;
1728 val = cmpxchg(lock, old, new);
1729 } while (unlikely (val != old));
1733 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1735 e820__range_add(addr, size, E820_TYPE_ACPI);
1736 e820__update_table_print();