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>
39 #include <asm/irqdomain.h>
40 #include <asm/pci_x86.h>
41 #include <asm/pgtable.h>
42 #include <asm/io_apic.h>
45 #include <asm/mpspec.h>
47 #include <asm/i8259.h>
49 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
50 static int __initdata acpi_force = 0;
52 EXPORT_SYMBOL(acpi_disabled);
55 # include <asm/proto.h>
58 #define PREFIX "ACPI: "
60 int acpi_noirq; /* skip ACPI IRQ initialization */
61 int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
62 EXPORT_SYMBOL(acpi_pci_disabled);
67 int acpi_disable_cmcff;
69 u8 acpi_sci_flags __initdata;
70 int acpi_sci_override_gsi __initdata;
71 int acpi_skip_timer_override __initdata;
72 int acpi_use_timer_override __initdata;
73 int acpi_fix_pin2_polarity __initdata;
75 #ifdef CONFIG_X86_LOCAL_APIC
76 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
79 #ifdef CONFIG_X86_IO_APIC
81 * Locks related to IOAPIC hotplug
83 * ->device_hotplug_lock
86 * Interrupt mapping side:
91 static DEFINE_MUTEX(acpi_ioapic_lock);
94 /* --------------------------------------------------------------------------
95 Boot-time Configuration
96 -------------------------------------------------------------------------- */
99 * The default interrupt routing model is PIC (8259). This gets
100 * overridden if IOAPICs are enumerated (below).
102 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
106 * ISA irqs by default are the first 16 gsis but can be
107 * any gsi as specified by an interrupt source override.
109 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
110 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
113 #define ACPI_INVALID_GSI INT_MIN
116 * This is just a simple wrapper around early_ioremap(),
117 * with sanity checks for phys == 0 and size == 0.
119 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
125 return early_ioremap(phys, size);
128 void __init __acpi_unmap_table(char *map, unsigned long size)
133 early_iounmap(map, size);
136 #ifdef CONFIG_X86_LOCAL_APIC
137 static int __init acpi_parse_madt(struct acpi_table_header *table)
139 struct acpi_table_madt *madt = NULL;
141 if (!boot_cpu_has(X86_FEATURE_APIC))
144 madt = (struct acpi_table_madt *)table;
146 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
151 acpi_lapic_addr = (u64) madt->address;
153 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
157 default_acpi_madt_oem_check(madt->header.oem_id,
158 madt->header.oem_table_id);
164 * acpi_register_lapic - register a local apic and generates a logic cpu number
165 * @id: local apic id to register
166 * @acpiid: ACPI id to register
167 * @enabled: this cpu is enabled or not
169 * Returns the logic cpu number which maps to the local apic
171 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
173 unsigned int ver = 0;
176 if (id >= MAX_LOCAL_APIC) {
177 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
181 if (boot_cpu_physical_apicid != -1U)
182 ver = boot_cpu_apic_version;
184 cpu = __generic_processor_info(id, ver, enabled);
186 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
192 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
194 struct acpi_madt_local_x2apic *processor = NULL;
198 processor = (struct acpi_madt_local_x2apic *)header;
200 if (BAD_MADT_ENTRY(processor, end))
203 acpi_table_print_madt_entry(header);
205 apic_id = processor->local_apic_id;
206 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
207 #ifdef CONFIG_X86_X2APIC
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) && enabled)
216 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
218 acpi_register_lapic(apic_id, processor->uid, enabled);
220 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
227 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
229 struct acpi_madt_local_apic *processor = NULL;
231 processor = (struct acpi_madt_local_apic *)header;
233 if (BAD_MADT_ENTRY(processor, end))
236 acpi_table_print_madt_entry(header);
238 /* Ignore invalid ID */
239 if (processor->id == 0xff)
243 * We need to register disabled CPU as well to permit
244 * counting disabled CPUs. This allows us to size
245 * cpus_possible_map more accurately, to permit
246 * to not preallocating memory for all NR_CPUS
247 * when we use CPU hotplug.
249 acpi_register_lapic(processor->id, /* APIC ID */
250 processor->processor_id, /* ACPI ID */
251 processor->lapic_flags & ACPI_MADT_ENABLED);
257 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
259 struct acpi_madt_local_sapic *processor = NULL;
261 processor = (struct acpi_madt_local_sapic *)header;
263 if (BAD_MADT_ENTRY(processor, end))
266 acpi_table_print_madt_entry(header);
268 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
269 processor->processor_id, /* ACPI ID */
270 processor->lapic_flags & ACPI_MADT_ENABLED);
276 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
277 const unsigned long end)
279 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
281 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
283 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
286 acpi_table_print_madt_entry(header);
288 acpi_lapic_addr = lapic_addr_ovr->address;
294 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
295 const unsigned long end)
297 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
299 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
301 if (BAD_MADT_ENTRY(x2apic_nmi, end))
304 acpi_table_print_madt_entry(header);
306 if (x2apic_nmi->lint != 1)
307 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
313 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
315 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
317 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
319 if (BAD_MADT_ENTRY(lapic_nmi, end))
322 acpi_table_print_madt_entry(header);
324 if (lapic_nmi->lint != 1)
325 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
330 #endif /*CONFIG_X86_LOCAL_APIC */
332 #ifdef CONFIG_X86_IO_APIC
335 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
340 struct mpc_intsrc mp_irq;
343 * Convert 'gsi' to 'ioapic.pin'.
345 ioapic = mp_find_ioapic(gsi);
348 pin = mp_find_ioapic_pin(ioapic, gsi);
351 * TBD: This check is for faulty timer entries, where the override
352 * erroneously sets the trigger to level, resulting in a HUGE
353 * increase of timer interrupts!
355 if ((bus_irq == 0) && (trigger == 3))
358 mp_irq.type = MP_INTSRC;
359 mp_irq.irqtype = mp_INT;
360 mp_irq.irqflag = (trigger << 2) | polarity;
361 mp_irq.srcbus = MP_ISA_BUS;
362 mp_irq.srcbusirq = bus_irq; /* IRQ */
363 mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
364 mp_irq.dstirq = pin; /* INTIN# */
366 mp_save_irq(&mp_irq);
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] = ACPI_INVALID_GSI;
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);
415 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
417 struct acpi_madt_io_apic *ioapic = NULL;
418 struct ioapic_domain_cfg cfg = {
419 .type = IOAPIC_DOMAIN_DYNAMIC,
420 .ops = &mp_ioapic_irqdomain_ops,
423 ioapic = (struct acpi_madt_io_apic *)header;
425 if (BAD_MADT_ENTRY(ioapic, end))
428 acpi_table_print_madt_entry(header);
430 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
431 if (ioapic->global_irq_base < nr_legacy_irqs())
432 cfg.type = IOAPIC_DOMAIN_LEGACY;
434 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
441 * Parse Interrupt Source Override for the ACPI SCI
443 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
445 if (trigger == 0) /* compatible SCI trigger is level */
448 if (polarity == 0) /* compatible SCI polarity is low */
451 /* Command-line over-ride via acpi_sci= */
452 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
453 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
455 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
456 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
458 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
459 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
462 * stash over-ride to indicate we've been here
463 * and for later update of acpi_gbl_FADT
465 acpi_sci_override_gsi = gsi;
470 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
471 const unsigned long end)
473 struct acpi_madt_interrupt_override *intsrc = NULL;
475 intsrc = (struct acpi_madt_interrupt_override *)header;
477 if (BAD_MADT_ENTRY(intsrc, end))
480 acpi_table_print_madt_entry(header);
482 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
483 acpi_sci_ioapic_setup(intsrc->source_irq,
484 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
485 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
490 if (intsrc->source_irq == 0) {
491 if (acpi_skip_timer_override) {
492 printk(PREFIX "BIOS IRQ0 override ignored.\n");
496 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
497 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
498 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
499 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
503 mp_override_legacy_irq(intsrc->source_irq,
504 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
505 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
512 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
514 struct acpi_madt_nmi_source *nmi_src = NULL;
516 nmi_src = (struct acpi_madt_nmi_source *)header;
518 if (BAD_MADT_ENTRY(nmi_src, end))
521 acpi_table_print_madt_entry(header);
523 /* TBD: Support nimsrc entries? */
528 #endif /* CONFIG_X86_IO_APIC */
531 * acpi_pic_sci_set_trigger()
533 * use ELCR to set PIC-mode trigger type for SCI
535 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
536 * it may require Edge Trigger -- use "acpi_sci=edge"
538 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
539 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
540 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
541 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
544 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
546 unsigned int mask = 1 << irq;
547 unsigned int old, new;
549 /* Real old ELCR mask */
550 old = inb(0x4d0) | (inb(0x4d1) << 8);
553 * If we use ACPI to set PCI IRQs, then we should clear ELCR
554 * since we will set it correctly as we enable the PCI irq
557 new = acpi_noirq ? old : 0;
560 * Update SCI information in the ELCR, it isn't in the PCI
564 case 1: /* Edge - clear */
567 case 3: /* Level - set */
575 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
577 outb(new >> 8, 0x4d1);
580 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
582 int rc, irq, trigger, polarity;
584 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
589 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
591 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
592 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
593 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
602 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
604 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
606 if (isa_irq < nr_legacy_irqs() &&
607 isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
608 *gsi = isa_irq_to_gsi[isa_irq];
615 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
616 int trigger, int polarity)
620 * Make sure all (legacy) PCI IRQs are set as level-triggered.
622 if (trigger == ACPI_LEVEL_SENSITIVE)
623 elcr_set_level_irq(gsi);
629 #ifdef CONFIG_X86_LOCAL_APIC
630 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
631 int trigger, int polarity)
634 #ifdef CONFIG_X86_IO_APIC
636 struct irq_alloc_info info;
638 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
639 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
640 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
641 ioapic_set_alloc_attr(&info, node, trigger, polarity);
643 mutex_lock(&acpi_ioapic_lock);
644 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
645 /* Don't set up the ACPI SCI because it's already set up */
646 if (irq >= 0 && enable_update_mptable &&
647 acpi_gbl_FADT.sci_interrupt != gsi)
648 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
649 mutex_unlock(&acpi_ioapic_lock);
655 static void acpi_unregister_gsi_ioapic(u32 gsi)
657 #ifdef CONFIG_X86_IO_APIC
660 mutex_lock(&acpi_ioapic_lock);
661 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
664 mutex_unlock(&acpi_ioapic_lock);
669 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
670 int trigger, int polarity) = acpi_register_gsi_pic;
671 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
673 #ifdef CONFIG_ACPI_SLEEP
674 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
676 int (*acpi_suspend_lowlevel)(void);
680 * success: return IRQ number (>=0)
681 * failure: return < 0
683 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
685 return __acpi_register_gsi(dev, gsi, trigger, polarity);
687 EXPORT_SYMBOL_GPL(acpi_register_gsi);
689 void acpi_unregister_gsi(u32 gsi)
691 if (__acpi_unregister_gsi)
692 __acpi_unregister_gsi(gsi);
694 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
696 #ifdef CONFIG_X86_LOCAL_APIC
697 static void __init acpi_set_irq_model_ioapic(void)
699 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
700 __acpi_register_gsi = acpi_register_gsi_ioapic;
701 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
707 * ACPI based hotplug support for CPU
709 #ifdef CONFIG_ACPI_HOTPLUG_CPU
710 #include <acpi/processor.h>
712 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
714 #ifdef CONFIG_ACPI_NUMA
717 nid = acpi_get_node(handle);
719 set_apicid_to_node(physid, nid);
720 numa_set_node(cpu, nid);
726 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
730 cpu = acpi_register_lapic(physid, U32_MAX, ACPI_MADT_ENABLED);
732 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
736 acpi_processor_set_pdc(handle);
737 acpi_map_cpu2node(handle, cpu, physid);
742 EXPORT_SYMBOL(acpi_map_cpu);
744 int acpi_unmap_cpu(int cpu)
746 #ifdef CONFIG_ACPI_NUMA
747 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
750 per_cpu(x86_cpu_to_apicid, cpu) = -1;
751 set_cpu_present(cpu, false);
756 EXPORT_SYMBOL(acpi_unmap_cpu);
757 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
759 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
762 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
765 struct ioapic_domain_cfg cfg = {
766 .type = IOAPIC_DOMAIN_DYNAMIC,
767 .ops = &mp_ioapic_irqdomain_ops,
770 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
772 unsigned long long uid;
775 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
777 if (ACPI_FAILURE(status)) {
778 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
781 ioapic_id = (int)uid;
784 mutex_lock(&acpi_ioapic_lock);
785 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
786 mutex_unlock(&acpi_ioapic_lock);
791 EXPORT_SYMBOL(acpi_register_ioapic);
793 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
797 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
798 mutex_lock(&acpi_ioapic_lock);
799 ret = mp_unregister_ioapic(gsi_base);
800 mutex_unlock(&acpi_ioapic_lock);
805 EXPORT_SYMBOL(acpi_unregister_ioapic);
808 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
809 * has been registered
810 * @handle: ACPI handle of the IOAPIC deivce
811 * @gsi_base: GSI base associated with the IOAPIC
813 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
814 * with acpi_register_ioapic()/acpi_unregister_ioapic().
816 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
820 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
821 mutex_lock(&acpi_ioapic_lock);
822 ret = mp_ioapic_registered(gsi_base);
823 mutex_unlock(&acpi_ioapic_lock);
829 static int __init acpi_parse_sbf(struct acpi_table_header *table)
831 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
833 sbf_port = sb->cmos_index; /* Save CMOS port */
838 #ifdef CONFIG_HPET_TIMER
839 #include <asm/hpet.h>
841 static struct resource *hpet_res __initdata;
843 static int __init acpi_parse_hpet(struct acpi_table_header *table)
845 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
847 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
848 printk(KERN_WARNING PREFIX "HPET timers must be located in "
853 hpet_address = hpet_tbl->address.address;
854 hpet_blockid = hpet_tbl->sequence;
857 * Some broken BIOSes advertise HPET at 0x0. We really do not
858 * want to allocate a resource there.
861 printk(KERN_WARNING PREFIX
862 "HPET id: %#x base: %#lx is invalid\n",
863 hpet_tbl->id, hpet_address);
868 * Some even more broken BIOSes advertise HPET at
869 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
872 if (hpet_address == 0xfed0000000000000UL) {
873 if (!hpet_force_user) {
874 printk(KERN_WARNING PREFIX "HPET id: %#x "
875 "base: 0xfed0000000000000 is bogus\n "
876 "try hpet=force on the kernel command line to "
877 "fix it up to 0xfed00000.\n", hpet_tbl->id);
881 printk(KERN_WARNING PREFIX
882 "HPET id: %#x base: 0xfed0000000000000 fixed up "
883 "to 0xfed00000.\n", hpet_tbl->id);
887 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
888 hpet_tbl->id, hpet_address);
891 * Allocate and initialize the HPET firmware resource for adding into
892 * the resource tree during the lateinit timeframe.
894 #define HPET_RESOURCE_NAME_SIZE 9
895 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
897 hpet_res->name = (void *)&hpet_res[1];
898 hpet_res->flags = IORESOURCE_MEM;
899 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
902 hpet_res->start = hpet_address;
903 hpet_res->end = hpet_address + (1 * 1024) - 1;
909 * hpet_insert_resource inserts the HPET resources used into the resource
912 static __init int hpet_insert_resource(void)
917 return insert_resource(&iomem_resource, hpet_res);
920 late_initcall(hpet_insert_resource);
923 #define acpi_parse_hpet NULL
926 static int __init acpi_parse_fadt(struct acpi_table_header *table)
928 if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
929 pr_debug("ACPI: no legacy devices present\n");
930 x86_platform.legacy.devices.pnpbios = 0;
933 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
934 pr_debug("ACPI: not registering RTC platform device\n");
935 x86_platform.legacy.rtc = 0;
938 #ifdef CONFIG_X86_PM_TIMER
939 /* detect the location of the ACPI PM Timer */
940 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
942 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
943 ACPI_ADR_SPACE_SYSTEM_IO)
946 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
948 * "X" fields are optional extensions to the original V1.0
949 * fields, so we must selectively expand V1.0 fields if the
950 * corresponding X field is zero.
953 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
956 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
959 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
965 #ifdef CONFIG_X86_LOCAL_APIC
967 * Parse LAPIC entries in MADT
968 * returns 0 on success, < 0 on error
971 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
975 if (!boot_cpu_has(X86_FEATURE_APIC))
979 * Note that the LAPIC address is obtained from the MADT (32-bit value)
980 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
983 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
984 acpi_parse_lapic_addr_ovr, 0);
986 printk(KERN_ERR PREFIX
987 "Error parsing LAPIC address override entry\n");
991 register_lapic_address(acpi_lapic_addr);
996 static int __init acpi_parse_madt_lapic_entries(void)
1001 struct acpi_subtable_proc madt_proc[2];
1003 if (!boot_cpu_has(X86_FEATURE_APIC))
1006 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1007 acpi_parse_sapic, MAX_LOCAL_APIC);
1010 memset(madt_proc, 0, sizeof(madt_proc));
1011 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1012 madt_proc[0].handler = acpi_parse_lapic;
1013 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1014 madt_proc[1].handler = acpi_parse_x2apic;
1015 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1016 sizeof(struct acpi_table_madt),
1017 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1019 printk(KERN_ERR PREFIX
1020 "Error parsing LAPIC/X2APIC entries\n");
1024 count = madt_proc[0].count;
1025 x2count = madt_proc[1].count;
1027 if (!count && !x2count) {
1028 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1029 /* TBD: Cleanup to allow fallback to MPS */
1031 } else if (count < 0 || x2count < 0) {
1032 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1033 /* TBD: Cleanup to allow fallback to MPS */
1037 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1038 acpi_parse_x2apic_nmi, 0);
1039 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1040 acpi_parse_lapic_nmi, 0);
1041 if (count < 0 || x2count < 0) {
1042 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1043 /* TBD: Cleanup to allow fallback to MPS */
1048 #endif /* CONFIG_X86_LOCAL_APIC */
1050 #ifdef CONFIG_X86_IO_APIC
1051 static void __init mp_config_acpi_legacy_irqs(void)
1054 struct mpc_intsrc mp_irq;
1058 * Fabricate the legacy ISA bus (bus #31).
1060 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1062 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1063 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1066 * Use the default configuration for the IRQs 0-15. Unless
1067 * overridden by (MADT) interrupt source override entries.
1069 for (i = 0; i < nr_legacy_irqs(); i++) {
1071 unsigned int dstapic;
1075 /* Locate the gsi that irq i maps to. */
1076 if (acpi_isa_irq_to_gsi(i, &gsi))
1080 * Locate the IOAPIC that manages the ISA IRQ.
1082 ioapic = mp_find_ioapic(gsi);
1085 pin = mp_find_ioapic_pin(ioapic, gsi);
1086 dstapic = mpc_ioapic_id(ioapic);
1088 for (idx = 0; idx < mp_irq_entries; idx++) {
1089 struct mpc_intsrc *irq = mp_irqs + idx;
1091 /* Do we already have a mapping for this ISA IRQ? */
1092 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1095 /* Do we already have a mapping for this IOAPIC pin */
1096 if (irq->dstapic == dstapic && irq->dstirq == pin)
1100 if (idx != mp_irq_entries) {
1101 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1102 continue; /* IRQ already used */
1105 mp_irq.type = MP_INTSRC;
1106 mp_irq.irqflag = 0; /* Conforming */
1107 mp_irq.srcbus = MP_ISA_BUS;
1108 mp_irq.dstapic = dstapic;
1109 mp_irq.irqtype = mp_INT;
1110 mp_irq.srcbusirq = i; /* Identity mapped */
1111 mp_irq.dstirq = pin;
1113 mp_save_irq(&mp_irq);
1118 * Parse IOAPIC related entries in MADT
1119 * returns 0 on success, < 0 on error
1121 static int __init acpi_parse_madt_ioapic_entries(void)
1126 * ACPI interpreter is required to complete interrupt setup,
1127 * so if it is off, don't enumerate the io-apics with ACPI.
1128 * If MPS is present, it will handle them,
1129 * otherwise the system will stay in PIC mode
1131 if (acpi_disabled || acpi_noirq)
1134 if (!boot_cpu_has(X86_FEATURE_APIC))
1138 * if "noapic" boot option, don't look for IO-APICs
1140 if (skip_ioapic_setup) {
1141 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1142 "due to 'noapic' option.\n");
1146 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1149 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1151 } else if (count < 0) {
1152 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1156 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1157 acpi_parse_int_src_ovr, nr_irqs);
1159 printk(KERN_ERR PREFIX
1160 "Error parsing interrupt source overrides entry\n");
1161 /* TBD: Cleanup to allow fallback to MPS */
1166 * If BIOS did not supply an INT_SRC_OVR for the SCI
1167 * pretend we got one so we can set the SCI flags.
1169 if (!acpi_sci_override_gsi)
1170 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1171 acpi_gbl_FADT.sci_interrupt);
1173 /* Fill in identity legacy mappings where no override */
1174 mp_config_acpi_legacy_irqs();
1176 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1177 acpi_parse_nmi_src, nr_irqs);
1179 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1180 /* TBD: Cleanup to allow fallback to MPS */
1187 static inline int acpi_parse_madt_ioapic_entries(void)
1191 #endif /* !CONFIG_X86_IO_APIC */
1193 static void __init early_acpi_process_madt(void)
1195 #ifdef CONFIG_X86_LOCAL_APIC
1198 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1201 * Parse MADT LAPIC entries
1203 error = early_acpi_parse_madt_lapic_addr_ovr();
1206 smp_found_config = 1;
1208 if (error == -EINVAL) {
1210 * Dell Precision Workstation 410, 610 come here.
1212 printk(KERN_ERR PREFIX
1213 "Invalid BIOS MADT, disabling ACPI\n");
1220 static void __init acpi_process_madt(void)
1222 #ifdef CONFIG_X86_LOCAL_APIC
1225 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1228 * Parse MADT LAPIC entries
1230 error = acpi_parse_madt_lapic_entries();
1235 * Parse MADT IO-APIC entries
1237 mutex_lock(&acpi_ioapic_lock);
1238 error = acpi_parse_madt_ioapic_entries();
1239 mutex_unlock(&acpi_ioapic_lock);
1241 acpi_set_irq_model_ioapic();
1243 smp_found_config = 1;
1246 if (error == -EINVAL) {
1248 * Dell Precision Workstation 410, 610 come here.
1250 printk(KERN_ERR PREFIX
1251 "Invalid BIOS MADT, disabling ACPI\n");
1256 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1257 * In the event an MPS table was found, forget it.
1258 * Boot with "acpi=off" to use MPS on such a system.
1260 if (smp_found_config) {
1261 printk(KERN_WARNING PREFIX
1262 "No APIC-table, disabling MPS\n");
1263 smp_found_config = 0;
1268 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1269 * processors, where MPS only supports physical.
1271 if (acpi_lapic && acpi_ioapic)
1272 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1274 else if (acpi_lapic)
1275 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1276 "configuration information\n");
1281 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1284 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1291 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1294 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1301 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1304 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1308 "Warning: DMI blacklist says broken, but acpi forced\n");
1314 * Force ignoring BIOS IRQ0 override
1316 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1318 if (!acpi_skip_timer_override) {
1319 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1321 acpi_skip_timer_override = 1;
1327 * ACPI offers an alternative platform interface model that removes
1328 * ACPI hardware requirements for platforms that do not implement
1329 * the PC Architecture.
1331 * We initialize the Hardware-reduced ACPI model here:
1333 static void __init acpi_reduced_hw_init(void)
1335 if (acpi_gbl_reduced_hardware) {
1337 * Override x86_init functions and bypass legacy pic
1338 * in Hardware-reduced ACPI mode
1340 x86_init.timers.timer_init = x86_init_noop;
1341 x86_init.irqs.pre_vector_init = x86_init_noop;
1342 legacy_pic = &null_legacy_pic;
1347 * If your system is blacklisted here, but you find that acpi=force
1348 * works for you, please contact linux-acpi@vger.kernel.org
1350 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1352 * Boxes that need ACPI disabled
1355 .callback = dmi_disable_acpi,
1356 .ident = "IBM Thinkpad",
1358 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1359 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1364 * Boxes that need ACPI PCI IRQ routing disabled
1367 .callback = disable_acpi_irq,
1368 .ident = "ASUS A7V",
1370 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1371 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1372 /* newer BIOS, Revision 1011, does work */
1373 DMI_MATCH(DMI_BIOS_VERSION,
1374 "ASUS A7V ACPI BIOS Revision 1007"),
1379 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1380 * for LPC bridge, which is needed for the PCI
1381 * interrupt links to work. DSDT fix is in bug 5966.
1382 * 2645, 2646 model numbers are shared with 600/600E/600X
1384 .callback = disable_acpi_irq,
1385 .ident = "IBM Thinkpad 600 Series 2645",
1387 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1388 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1392 .callback = disable_acpi_irq,
1393 .ident = "IBM Thinkpad 600 Series 2646",
1395 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1396 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1400 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1403 .callback = disable_acpi_pci,
1404 .ident = "ASUS PR-DLS",
1406 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1407 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1408 DMI_MATCH(DMI_BIOS_VERSION,
1409 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1410 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1414 .callback = disable_acpi_pci,
1415 .ident = "Acer TravelMate 36x Laptop",
1417 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1418 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1424 /* second table for DMI checks that should run after early-quirks */
1425 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1427 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1428 * which includes some code which overrides all temperature
1429 * trip points to 16C if the INTIN2 input of the I/O APIC
1430 * is enabled. This input is incorrectly designated the
1431 * ISA IRQ 0 via an interrupt source override even though
1432 * it is wired to the output of the master 8259A and INTIN0
1433 * is not connected at all. Force ignoring BIOS IRQ0
1434 * override in that cases.
1437 .callback = dmi_ignore_irq0_timer_override,
1438 .ident = "HP nx6115 laptop",
1440 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1441 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1445 .callback = dmi_ignore_irq0_timer_override,
1446 .ident = "HP NX6125 laptop",
1448 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1449 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1453 .callback = dmi_ignore_irq0_timer_override,
1454 .ident = "HP NX6325 laptop",
1456 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1457 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1461 .callback = dmi_ignore_irq0_timer_override,
1462 .ident = "HP 6715b laptop",
1464 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1465 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1469 .callback = dmi_ignore_irq0_timer_override,
1470 .ident = "FUJITSU SIEMENS",
1472 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1473 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1480 * acpi_boot_table_init() and acpi_boot_init()
1481 * called from setup_arch(), always.
1482 * 1. checksums all tables
1483 * 2. enumerates lapics
1484 * 3. enumerates io-apics
1486 * acpi_table_init() is separate to allow reading SRAT without
1487 * other side effects.
1489 * side effects of acpi_boot_init:
1490 * acpi_lapic = 1 if LAPIC found
1491 * acpi_ioapic = 1 if IOAPIC found
1492 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1493 * if acpi_blacklisted() acpi_disabled = 1;
1494 * acpi_irq_model=...
1498 void __init acpi_boot_table_init(void)
1500 dmi_check_system(acpi_dmi_table);
1503 * If acpi_disabled, bail out
1509 * Initialize the ACPI boot-time table parser.
1511 if (acpi_table_init()) {
1516 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1519 * blacklist may disable ACPI entirely
1521 if (acpi_blacklisted()) {
1523 printk(KERN_WARNING PREFIX "acpi=force override\n");
1525 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1532 int __init early_acpi_boot_init(void)
1535 * If acpi_disabled, bail out
1541 * Process the Multiple APIC Description Table (MADT), if present
1543 early_acpi_process_madt();
1546 * Hardware-reduced ACPI mode initialization:
1548 acpi_reduced_hw_init();
1553 int __init acpi_boot_init(void)
1555 /* those are executed after early-quirks are executed */
1556 dmi_check_system(acpi_dmi_table_late);
1559 * If acpi_disabled, bail out
1564 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1567 * set sci_int and PM timer address
1569 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1572 * Process the Multiple APIC Description Table (MADT), if present
1574 acpi_process_madt();
1576 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1579 x86_init.pci.init = pci_acpi_init;
1584 static int __init parse_acpi(char *arg)
1589 /* "acpi=off" disables both ACPI table parsing and interpreter */
1590 if (strcmp(arg, "off") == 0) {
1593 /* acpi=force to over-ride black-list */
1594 else if (strcmp(arg, "force") == 0) {
1598 /* acpi=strict disables out-of-spec workarounds */
1599 else if (strcmp(arg, "strict") == 0) {
1602 /* acpi=rsdt use RSDT instead of XSDT */
1603 else if (strcmp(arg, "rsdt") == 0) {
1604 acpi_gbl_do_not_use_xsdt = TRUE;
1606 /* "acpi=noirq" disables ACPI interrupt routing */
1607 else if (strcmp(arg, "noirq") == 0) {
1610 /* "acpi=copy_dsdt" copys DSDT */
1611 else if (strcmp(arg, "copy_dsdt") == 0) {
1612 acpi_gbl_copy_dsdt_locally = 1;
1614 /* "acpi=nocmcff" disables FF mode for corrected errors */
1615 else if (strcmp(arg, "nocmcff") == 0) {
1616 acpi_disable_cmcff = 1;
1618 /* Core will printk when we return error. */
1623 early_param("acpi", parse_acpi);
1625 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1626 static int __init parse_pci(char *arg)
1628 if (arg && strcmp(arg, "noacpi") == 0)
1632 early_param("pci", parse_pci);
1634 int __init acpi_mps_check(void)
1636 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1637 /* mptable code is not built-in*/
1638 if (acpi_disabled || acpi_noirq) {
1639 printk(KERN_WARNING "MPS support code is not built-in.\n"
1640 "Using acpi=off or acpi=noirq or pci=noacpi "
1641 "may have problem\n");
1648 #ifdef CONFIG_X86_IO_APIC
1649 static int __init parse_acpi_skip_timer_override(char *arg)
1651 acpi_skip_timer_override = 1;
1654 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1656 static int __init parse_acpi_use_timer_override(char *arg)
1658 acpi_use_timer_override = 1;
1661 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1662 #endif /* CONFIG_X86_IO_APIC */
1664 static int __init setup_acpi_sci(char *s)
1668 if (!strcmp(s, "edge"))
1669 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1670 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1671 else if (!strcmp(s, "level"))
1672 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1673 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1674 else if (!strcmp(s, "high"))
1675 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1676 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1677 else if (!strcmp(s, "low"))
1678 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1679 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1684 early_param("acpi_sci", setup_acpi_sci);
1686 int __acpi_acquire_global_lock(unsigned int *lock)
1688 unsigned int old, new, val;
1691 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1692 val = cmpxchg(lock, old, new);
1693 } while (unlikely (val != old));
1694 return (new < 3) ? -1 : 0;
1697 int __acpi_release_global_lock(unsigned int *lock)
1699 unsigned int old, new, val;
1703 val = cmpxchg(lock, old, new);
1704 } while (unlikely (val != old));
1708 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1710 e820_add_region(addr, size, E820_ACPI);