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;
80 * Locks related to IOAPIC hotplug
82 * ->device_hotplug_lock
85 * Interrupt mapping side:
90 static DEFINE_MUTEX(acpi_ioapic_lock);
92 /* --------------------------------------------------------------------------
93 Boot-time Configuration
94 -------------------------------------------------------------------------- */
97 * The default interrupt routing model is PIC (8259). This gets
98 * overridden if IOAPICs are enumerated (below).
100 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
104 * ISA irqs by default are the first 16 gsis but can be
105 * any gsi as specified by an interrupt source override.
107 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
108 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
111 #define ACPI_INVALID_GSI INT_MIN
114 * This is just a simple wrapper around early_ioremap(),
115 * with sanity checks for phys == 0 and size == 0.
117 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
123 return early_ioremap(phys, size);
126 void __init __acpi_unmap_table(char *map, unsigned long size)
131 early_iounmap(map, size);
134 #ifdef CONFIG_X86_LOCAL_APIC
135 static int __init acpi_parse_madt(struct acpi_table_header *table)
137 struct acpi_table_madt *madt = NULL;
139 if (!boot_cpu_has(X86_FEATURE_APIC))
142 madt = (struct acpi_table_madt *)table;
144 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
149 acpi_lapic_addr = (u64) madt->address;
151 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
155 default_acpi_madt_oem_check(madt->header.oem_id,
156 madt->header.oem_table_id);
162 * acpi_register_lapic - register a local apic and generates a logic cpu number
163 * @id: local apic id to register
164 * @acpiid: ACPI id to register
165 * @enabled: this cpu is enabled or not
167 * Returns the logic cpu number which maps to the local apic
169 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
171 unsigned int ver = 0;
174 if (id >= MAX_LOCAL_APIC) {
175 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
179 if (boot_cpu_physical_apicid != -1U)
180 ver = boot_cpu_apic_version;
182 cpu = __generic_processor_info(id, ver, enabled);
184 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
190 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
192 struct acpi_madt_local_x2apic *processor = NULL;
196 processor = (struct acpi_madt_local_x2apic *)header;
198 if (BAD_MADT_ENTRY(processor, end))
201 acpi_table_print_madt_entry(header);
203 apic_id = processor->local_apic_id;
204 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
205 #ifdef CONFIG_X86_X2APIC
207 * We need to register disabled CPU as well to permit
208 * counting disabled CPUs. This allows us to size
209 * cpus_possible_map more accurately, to permit
210 * to not preallocating memory for all NR_CPUS
211 * when we use CPU hotplug.
213 if (!apic->apic_id_valid(apic_id) && enabled)
214 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
216 acpi_register_lapic(apic_id, processor->uid, enabled);
218 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
225 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
227 struct acpi_madt_local_apic *processor = NULL;
229 processor = (struct acpi_madt_local_apic *)header;
231 if (BAD_MADT_ENTRY(processor, end))
234 acpi_table_print_madt_entry(header);
236 /* Ignore invalid ID */
237 if (processor->id == 0xff)
241 * We need to register disabled CPU as well to permit
242 * counting disabled CPUs. This allows us to size
243 * cpus_possible_map more accurately, to permit
244 * to not preallocating memory for all NR_CPUS
245 * when we use CPU hotplug.
247 acpi_register_lapic(processor->id, /* APIC ID */
248 processor->processor_id, /* ACPI ID */
249 processor->lapic_flags & ACPI_MADT_ENABLED);
255 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
257 struct acpi_madt_local_sapic *processor = NULL;
259 processor = (struct acpi_madt_local_sapic *)header;
261 if (BAD_MADT_ENTRY(processor, end))
264 acpi_table_print_madt_entry(header);
266 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
267 processor->processor_id, /* ACPI ID */
268 processor->lapic_flags & ACPI_MADT_ENABLED);
274 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
275 const unsigned long end)
277 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
279 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
281 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
284 acpi_table_print_madt_entry(header);
286 acpi_lapic_addr = lapic_addr_ovr->address;
292 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
293 const unsigned long end)
295 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
297 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
299 if (BAD_MADT_ENTRY(x2apic_nmi, end))
302 acpi_table_print_madt_entry(header);
304 if (x2apic_nmi->lint != 1)
305 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
311 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
313 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
315 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
317 if (BAD_MADT_ENTRY(lapic_nmi, end))
320 acpi_table_print_madt_entry(header);
322 if (lapic_nmi->lint != 1)
323 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
328 #endif /*CONFIG_X86_LOCAL_APIC */
330 #ifdef CONFIG_X86_IO_APIC
333 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
338 struct mpc_intsrc mp_irq;
341 * Convert 'gsi' to 'ioapic.pin'.
343 ioapic = mp_find_ioapic(gsi);
346 pin = mp_find_ioapic_pin(ioapic, gsi);
349 * TBD: This check is for faulty timer entries, where the override
350 * erroneously sets the trigger to level, resulting in a HUGE
351 * increase of timer interrupts!
353 if ((bus_irq == 0) && (trigger == 3))
356 mp_irq.type = MP_INTSRC;
357 mp_irq.irqtype = mp_INT;
358 mp_irq.irqflag = (trigger << 2) | polarity;
359 mp_irq.srcbus = MP_ISA_BUS;
360 mp_irq.srcbusirq = bus_irq; /* IRQ */
361 mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
362 mp_irq.dstirq = pin; /* INTIN# */
364 mp_save_irq(&mp_irq);
367 * Reset default identity mapping if gsi is also an legacy IRQ,
368 * otherwise there will be more than one entry with the same GSI
369 * and acpi_isa_irq_to_gsi() may give wrong result.
371 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
372 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
373 isa_irq_to_gsi[bus_irq] = gsi;
376 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
379 #ifdef CONFIG_X86_MPPARSE
380 struct mpc_intsrc mp_irq;
381 struct pci_dev *pdev;
382 unsigned char number;
389 if (!dev || !dev_is_pci(dev))
392 pdev = to_pci_dev(dev);
393 number = pdev->bus->number;
396 /* print the entry should happen on mptable identically */
397 mp_irq.type = MP_INTSRC;
398 mp_irq.irqtype = mp_INT;
399 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
400 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
401 mp_irq.srcbus = number;
402 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
403 ioapic = mp_find_ioapic(gsi);
404 mp_irq.dstapic = mpc_ioapic_id(ioapic);
405 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
407 mp_save_irq(&mp_irq);
413 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
415 struct acpi_madt_io_apic *ioapic = NULL;
416 struct ioapic_domain_cfg cfg = {
417 .type = IOAPIC_DOMAIN_DYNAMIC,
418 .ops = &mp_ioapic_irqdomain_ops,
421 ioapic = (struct acpi_madt_io_apic *)header;
423 if (BAD_MADT_ENTRY(ioapic, end))
426 acpi_table_print_madt_entry(header);
428 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
429 if (ioapic->global_irq_base < nr_legacy_irqs())
430 cfg.type = IOAPIC_DOMAIN_LEGACY;
432 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
439 * Parse Interrupt Source Override for the ACPI SCI
441 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
443 if (trigger == 0) /* compatible SCI trigger is level */
446 if (polarity == 0) /* compatible SCI polarity is low */
449 /* Command-line over-ride via acpi_sci= */
450 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
451 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
453 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
454 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
456 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
457 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
460 * stash over-ride to indicate we've been here
461 * and for later update of acpi_gbl_FADT
463 acpi_sci_override_gsi = gsi;
468 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
469 const unsigned long end)
471 struct acpi_madt_interrupt_override *intsrc = NULL;
473 intsrc = (struct acpi_madt_interrupt_override *)header;
475 if (BAD_MADT_ENTRY(intsrc, end))
478 acpi_table_print_madt_entry(header);
480 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
481 acpi_sci_ioapic_setup(intsrc->source_irq,
482 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
483 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
488 if (intsrc->source_irq == 0) {
489 if (acpi_skip_timer_override) {
490 printk(PREFIX "BIOS IRQ0 override ignored.\n");
494 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
495 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
496 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
497 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
501 mp_override_legacy_irq(intsrc->source_irq,
502 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
503 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
510 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
512 struct acpi_madt_nmi_source *nmi_src = NULL;
514 nmi_src = (struct acpi_madt_nmi_source *)header;
516 if (BAD_MADT_ENTRY(nmi_src, end))
519 acpi_table_print_madt_entry(header);
521 /* TBD: Support nimsrc entries? */
526 #endif /* CONFIG_X86_IO_APIC */
529 * acpi_pic_sci_set_trigger()
531 * use ELCR to set PIC-mode trigger type for SCI
533 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
534 * it may require Edge Trigger -- use "acpi_sci=edge"
536 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
537 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
538 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
539 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
542 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
544 unsigned int mask = 1 << irq;
545 unsigned int old, new;
547 /* Real old ELCR mask */
548 old = inb(0x4d0) | (inb(0x4d1) << 8);
551 * If we use ACPI to set PCI IRQs, then we should clear ELCR
552 * since we will set it correctly as we enable the PCI irq
555 new = acpi_noirq ? old : 0;
558 * Update SCI information in the ELCR, it isn't in the PCI
562 case 1: /* Edge - clear */
565 case 3: /* Level - set */
573 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
575 outb(new >> 8, 0x4d1);
578 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
580 int rc, irq, trigger, polarity;
582 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
587 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
589 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
590 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
591 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
600 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
602 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
604 if (isa_irq < nr_legacy_irqs() &&
605 isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
606 *gsi = isa_irq_to_gsi[isa_irq];
613 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
614 int trigger, int polarity)
618 * Make sure all (legacy) PCI IRQs are set as level-triggered.
620 if (trigger == ACPI_LEVEL_SENSITIVE)
621 elcr_set_level_irq(gsi);
627 #ifdef CONFIG_X86_LOCAL_APIC
628 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
629 int trigger, int polarity)
632 #ifdef CONFIG_X86_IO_APIC
634 struct irq_alloc_info info;
636 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
637 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
638 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
639 ioapic_set_alloc_attr(&info, node, trigger, polarity);
641 mutex_lock(&acpi_ioapic_lock);
642 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
643 /* Don't set up the ACPI SCI because it's already set up */
644 if (irq >= 0 && enable_update_mptable &&
645 acpi_gbl_FADT.sci_interrupt != gsi)
646 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
647 mutex_unlock(&acpi_ioapic_lock);
653 static void acpi_unregister_gsi_ioapic(u32 gsi)
655 #ifdef CONFIG_X86_IO_APIC
658 mutex_lock(&acpi_ioapic_lock);
659 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
662 mutex_unlock(&acpi_ioapic_lock);
667 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
668 int trigger, int polarity) = acpi_register_gsi_pic;
669 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
671 #ifdef CONFIG_ACPI_SLEEP
672 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
674 int (*acpi_suspend_lowlevel)(void);
678 * success: return IRQ number (>=0)
679 * failure: return < 0
681 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
683 return __acpi_register_gsi(dev, gsi, trigger, polarity);
685 EXPORT_SYMBOL_GPL(acpi_register_gsi);
687 void acpi_unregister_gsi(u32 gsi)
689 if (__acpi_unregister_gsi)
690 __acpi_unregister_gsi(gsi);
692 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
694 #ifdef CONFIG_X86_LOCAL_APIC
695 static void __init acpi_set_irq_model_ioapic(void)
697 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
698 __acpi_register_gsi = acpi_register_gsi_ioapic;
699 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
705 * ACPI based hotplug support for CPU
707 #ifdef CONFIG_ACPI_HOTPLUG_CPU
708 #include <acpi/processor.h>
710 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
712 #ifdef CONFIG_ACPI_NUMA
715 nid = acpi_get_node(handle);
717 set_apicid_to_node(physid, nid);
718 numa_set_node(cpu, nid);
724 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
728 cpu = acpi_register_lapic(physid, U32_MAX, ACPI_MADT_ENABLED);
730 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
734 acpi_processor_set_pdc(handle);
735 acpi_map_cpu2node(handle, cpu, physid);
740 EXPORT_SYMBOL(acpi_map_cpu);
742 int acpi_unmap_cpu(int cpu)
744 #ifdef CONFIG_ACPI_NUMA
745 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
748 per_cpu(x86_cpu_to_apicid, cpu) = -1;
749 set_cpu_present(cpu, false);
754 EXPORT_SYMBOL(acpi_unmap_cpu);
755 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
757 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
760 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
763 struct ioapic_domain_cfg cfg = {
764 .type = IOAPIC_DOMAIN_DYNAMIC,
765 .ops = &mp_ioapic_irqdomain_ops,
768 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
770 unsigned long long uid;
773 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
775 if (ACPI_FAILURE(status)) {
776 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
779 ioapic_id = (int)uid;
782 mutex_lock(&acpi_ioapic_lock);
783 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
784 mutex_unlock(&acpi_ioapic_lock);
789 EXPORT_SYMBOL(acpi_register_ioapic);
791 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
795 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
796 mutex_lock(&acpi_ioapic_lock);
797 ret = mp_unregister_ioapic(gsi_base);
798 mutex_unlock(&acpi_ioapic_lock);
803 EXPORT_SYMBOL(acpi_unregister_ioapic);
806 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
807 * has been registered
808 * @handle: ACPI handle of the IOAPIC deivce
809 * @gsi_base: GSI base associated with the IOAPIC
811 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
812 * with acpi_register_ioapic()/acpi_unregister_ioapic().
814 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
818 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
819 mutex_lock(&acpi_ioapic_lock);
820 ret = mp_ioapic_registered(gsi_base);
821 mutex_unlock(&acpi_ioapic_lock);
827 static int __init acpi_parse_sbf(struct acpi_table_header *table)
829 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
831 sbf_port = sb->cmos_index; /* Save CMOS port */
836 #ifdef CONFIG_HPET_TIMER
837 #include <asm/hpet.h>
839 static struct resource *hpet_res __initdata;
841 static int __init acpi_parse_hpet(struct acpi_table_header *table)
843 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
845 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
846 printk(KERN_WARNING PREFIX "HPET timers must be located in "
851 hpet_address = hpet_tbl->address.address;
852 hpet_blockid = hpet_tbl->sequence;
855 * Some broken BIOSes advertise HPET at 0x0. We really do not
856 * want to allocate a resource there.
859 printk(KERN_WARNING PREFIX
860 "HPET id: %#x base: %#lx is invalid\n",
861 hpet_tbl->id, hpet_address);
866 * Some even more broken BIOSes advertise HPET at
867 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
870 if (hpet_address == 0xfed0000000000000UL) {
871 if (!hpet_force_user) {
872 printk(KERN_WARNING PREFIX "HPET id: %#x "
873 "base: 0xfed0000000000000 is bogus\n "
874 "try hpet=force on the kernel command line to "
875 "fix it up to 0xfed00000.\n", hpet_tbl->id);
879 printk(KERN_WARNING PREFIX
880 "HPET id: %#x base: 0xfed0000000000000 fixed up "
881 "to 0xfed00000.\n", hpet_tbl->id);
885 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
886 hpet_tbl->id, hpet_address);
889 * Allocate and initialize the HPET firmware resource for adding into
890 * the resource tree during the lateinit timeframe.
892 #define HPET_RESOURCE_NAME_SIZE 9
893 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
895 hpet_res->name = (void *)&hpet_res[1];
896 hpet_res->flags = IORESOURCE_MEM;
897 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
900 hpet_res->start = hpet_address;
901 hpet_res->end = hpet_address + (1 * 1024) - 1;
907 * hpet_insert_resource inserts the HPET resources used into the resource
910 static __init int hpet_insert_resource(void)
915 return insert_resource(&iomem_resource, hpet_res);
918 late_initcall(hpet_insert_resource);
921 #define acpi_parse_hpet NULL
924 static int __init acpi_parse_fadt(struct acpi_table_header *table)
926 if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
927 pr_debug("ACPI: no legacy devices present\n");
928 x86_platform.legacy.devices.pnpbios = 0;
931 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
932 pr_debug("ACPI: not registering RTC platform device\n");
933 x86_platform.legacy.rtc = 0;
936 #ifdef CONFIG_X86_PM_TIMER
937 /* detect the location of the ACPI PM Timer */
938 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
940 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
941 ACPI_ADR_SPACE_SYSTEM_IO)
944 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
946 * "X" fields are optional extensions to the original V1.0
947 * fields, so we must selectively expand V1.0 fields if the
948 * corresponding X field is zero.
951 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
954 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
957 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
963 #ifdef CONFIG_X86_LOCAL_APIC
965 * Parse LAPIC entries in MADT
966 * returns 0 on success, < 0 on error
969 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
973 if (!boot_cpu_has(X86_FEATURE_APIC))
977 * Note that the LAPIC address is obtained from the MADT (32-bit value)
978 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
981 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
982 acpi_parse_lapic_addr_ovr, 0);
984 printk(KERN_ERR PREFIX
985 "Error parsing LAPIC address override entry\n");
989 register_lapic_address(acpi_lapic_addr);
994 static int __init acpi_parse_madt_lapic_entries(void)
999 struct acpi_subtable_proc madt_proc[2];
1001 if (!boot_cpu_has(X86_FEATURE_APIC))
1004 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1005 acpi_parse_sapic, MAX_LOCAL_APIC);
1008 memset(madt_proc, 0, sizeof(madt_proc));
1009 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1010 madt_proc[0].handler = acpi_parse_lapic;
1011 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1012 madt_proc[1].handler = acpi_parse_x2apic;
1013 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1014 sizeof(struct acpi_table_madt),
1015 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1017 printk(KERN_ERR PREFIX
1018 "Error parsing LAPIC/X2APIC entries\n");
1022 count = madt_proc[0].count;
1023 x2count = madt_proc[1].count;
1025 if (!count && !x2count) {
1026 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1027 /* TBD: Cleanup to allow fallback to MPS */
1029 } else if (count < 0 || x2count < 0) {
1030 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1031 /* TBD: Cleanup to allow fallback to MPS */
1035 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1036 acpi_parse_x2apic_nmi, 0);
1037 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1038 acpi_parse_lapic_nmi, 0);
1039 if (count < 0 || x2count < 0) {
1040 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1041 /* TBD: Cleanup to allow fallback to MPS */
1046 #endif /* CONFIG_X86_LOCAL_APIC */
1048 #ifdef CONFIG_X86_IO_APIC
1049 static void __init mp_config_acpi_legacy_irqs(void)
1052 struct mpc_intsrc mp_irq;
1056 * Fabricate the legacy ISA bus (bus #31).
1058 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1060 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1061 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1064 * Use the default configuration for the IRQs 0-15. Unless
1065 * overridden by (MADT) interrupt source override entries.
1067 for (i = 0; i < nr_legacy_irqs(); i++) {
1069 unsigned int dstapic;
1073 /* Locate the gsi that irq i maps to. */
1074 if (acpi_isa_irq_to_gsi(i, &gsi))
1078 * Locate the IOAPIC that manages the ISA IRQ.
1080 ioapic = mp_find_ioapic(gsi);
1083 pin = mp_find_ioapic_pin(ioapic, gsi);
1084 dstapic = mpc_ioapic_id(ioapic);
1086 for (idx = 0; idx < mp_irq_entries; idx++) {
1087 struct mpc_intsrc *irq = mp_irqs + idx;
1089 /* Do we already have a mapping for this ISA IRQ? */
1090 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1093 /* Do we already have a mapping for this IOAPIC pin */
1094 if (irq->dstapic == dstapic && irq->dstirq == pin)
1098 if (idx != mp_irq_entries) {
1099 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1100 continue; /* IRQ already used */
1103 mp_irq.type = MP_INTSRC;
1104 mp_irq.irqflag = 0; /* Conforming */
1105 mp_irq.srcbus = MP_ISA_BUS;
1106 mp_irq.dstapic = dstapic;
1107 mp_irq.irqtype = mp_INT;
1108 mp_irq.srcbusirq = i; /* Identity mapped */
1109 mp_irq.dstirq = pin;
1111 mp_save_irq(&mp_irq);
1116 * Parse IOAPIC related entries in MADT
1117 * returns 0 on success, < 0 on error
1119 static int __init acpi_parse_madt_ioapic_entries(void)
1124 * ACPI interpreter is required to complete interrupt setup,
1125 * so if it is off, don't enumerate the io-apics with ACPI.
1126 * If MPS is present, it will handle them,
1127 * otherwise the system will stay in PIC mode
1129 if (acpi_disabled || acpi_noirq)
1132 if (!boot_cpu_has(X86_FEATURE_APIC))
1136 * if "noapic" boot option, don't look for IO-APICs
1138 if (skip_ioapic_setup) {
1139 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1140 "due to 'noapic' option.\n");
1144 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1147 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1149 } else if (count < 0) {
1150 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1154 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1155 acpi_parse_int_src_ovr, nr_irqs);
1157 printk(KERN_ERR PREFIX
1158 "Error parsing interrupt source overrides entry\n");
1159 /* TBD: Cleanup to allow fallback to MPS */
1164 * If BIOS did not supply an INT_SRC_OVR for the SCI
1165 * pretend we got one so we can set the SCI flags.
1167 if (!acpi_sci_override_gsi)
1168 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1169 acpi_gbl_FADT.sci_interrupt);
1171 /* Fill in identity legacy mappings where no override */
1172 mp_config_acpi_legacy_irqs();
1174 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1175 acpi_parse_nmi_src, nr_irqs);
1177 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1178 /* TBD: Cleanup to allow fallback to MPS */
1185 static inline int acpi_parse_madt_ioapic_entries(void)
1189 #endif /* !CONFIG_X86_IO_APIC */
1191 static void __init early_acpi_process_madt(void)
1193 #ifdef CONFIG_X86_LOCAL_APIC
1196 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1199 * Parse MADT LAPIC entries
1201 error = early_acpi_parse_madt_lapic_addr_ovr();
1204 smp_found_config = 1;
1206 if (error == -EINVAL) {
1208 * Dell Precision Workstation 410, 610 come here.
1210 printk(KERN_ERR PREFIX
1211 "Invalid BIOS MADT, disabling ACPI\n");
1218 static void __init acpi_process_madt(void)
1220 #ifdef CONFIG_X86_LOCAL_APIC
1223 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1226 * Parse MADT LAPIC entries
1228 error = acpi_parse_madt_lapic_entries();
1233 * Parse MADT IO-APIC entries
1235 mutex_lock(&acpi_ioapic_lock);
1236 error = acpi_parse_madt_ioapic_entries();
1237 mutex_unlock(&acpi_ioapic_lock);
1239 acpi_set_irq_model_ioapic();
1241 smp_found_config = 1;
1244 if (error == -EINVAL) {
1246 * Dell Precision Workstation 410, 610 come here.
1248 printk(KERN_ERR PREFIX
1249 "Invalid BIOS MADT, disabling ACPI\n");
1254 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1255 * In the event an MPS table was found, forget it.
1256 * Boot with "acpi=off" to use MPS on such a system.
1258 if (smp_found_config) {
1259 printk(KERN_WARNING PREFIX
1260 "No APIC-table, disabling MPS\n");
1261 smp_found_config = 0;
1266 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1267 * processors, where MPS only supports physical.
1269 if (acpi_lapic && acpi_ioapic)
1270 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1272 else if (acpi_lapic)
1273 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1274 "configuration information\n");
1279 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1282 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1289 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1292 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1299 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1302 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1306 "Warning: DMI blacklist says broken, but acpi forced\n");
1312 * Force ignoring BIOS IRQ0 override
1314 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1316 if (!acpi_skip_timer_override) {
1317 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1319 acpi_skip_timer_override = 1;
1325 * ACPI offers an alternative platform interface model that removes
1326 * ACPI hardware requirements for platforms that do not implement
1327 * the PC Architecture.
1329 * We initialize the Hardware-reduced ACPI model here:
1331 static void __init acpi_reduced_hw_init(void)
1333 if (acpi_gbl_reduced_hardware) {
1335 * Override x86_init functions and bypass legacy pic
1336 * in Hardware-reduced ACPI mode
1338 x86_init.timers.timer_init = x86_init_noop;
1339 x86_init.irqs.pre_vector_init = x86_init_noop;
1340 legacy_pic = &null_legacy_pic;
1345 * If your system is blacklisted here, but you find that acpi=force
1346 * works for you, please contact linux-acpi@vger.kernel.org
1348 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1350 * Boxes that need ACPI disabled
1353 .callback = dmi_disable_acpi,
1354 .ident = "IBM Thinkpad",
1356 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1357 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1362 * Boxes that need ACPI PCI IRQ routing disabled
1365 .callback = disable_acpi_irq,
1366 .ident = "ASUS A7V",
1368 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1369 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1370 /* newer BIOS, Revision 1011, does work */
1371 DMI_MATCH(DMI_BIOS_VERSION,
1372 "ASUS A7V ACPI BIOS Revision 1007"),
1377 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1378 * for LPC bridge, which is needed for the PCI
1379 * interrupt links to work. DSDT fix is in bug 5966.
1380 * 2645, 2646 model numbers are shared with 600/600E/600X
1382 .callback = disable_acpi_irq,
1383 .ident = "IBM Thinkpad 600 Series 2645",
1385 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1386 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1390 .callback = disable_acpi_irq,
1391 .ident = "IBM Thinkpad 600 Series 2646",
1393 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1394 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1398 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1401 .callback = disable_acpi_pci,
1402 .ident = "ASUS PR-DLS",
1404 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1405 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1406 DMI_MATCH(DMI_BIOS_VERSION,
1407 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1408 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1412 .callback = disable_acpi_pci,
1413 .ident = "Acer TravelMate 36x Laptop",
1415 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1416 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1422 /* second table for DMI checks that should run after early-quirks */
1423 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1425 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1426 * which includes some code which overrides all temperature
1427 * trip points to 16C if the INTIN2 input of the I/O APIC
1428 * is enabled. This input is incorrectly designated the
1429 * ISA IRQ 0 via an interrupt source override even though
1430 * it is wired to the output of the master 8259A and INTIN0
1431 * is not connected at all. Force ignoring BIOS IRQ0
1432 * override in that cases.
1435 .callback = dmi_ignore_irq0_timer_override,
1436 .ident = "HP nx6115 laptop",
1438 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1439 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1443 .callback = dmi_ignore_irq0_timer_override,
1444 .ident = "HP NX6125 laptop",
1446 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1447 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1451 .callback = dmi_ignore_irq0_timer_override,
1452 .ident = "HP NX6325 laptop",
1454 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1455 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1459 .callback = dmi_ignore_irq0_timer_override,
1460 .ident = "HP 6715b laptop",
1462 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1463 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1467 .callback = dmi_ignore_irq0_timer_override,
1468 .ident = "FUJITSU SIEMENS",
1470 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1471 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1478 * acpi_boot_table_init() and acpi_boot_init()
1479 * called from setup_arch(), always.
1480 * 1. checksums all tables
1481 * 2. enumerates lapics
1482 * 3. enumerates io-apics
1484 * acpi_table_init() is separate to allow reading SRAT without
1485 * other side effects.
1487 * side effects of acpi_boot_init:
1488 * acpi_lapic = 1 if LAPIC found
1489 * acpi_ioapic = 1 if IOAPIC found
1490 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1491 * if acpi_blacklisted() acpi_disabled = 1;
1492 * acpi_irq_model=...
1496 void __init acpi_boot_table_init(void)
1498 dmi_check_system(acpi_dmi_table);
1501 * If acpi_disabled, bail out
1507 * Initialize the ACPI boot-time table parser.
1509 if (acpi_table_init()) {
1514 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1517 * blacklist may disable ACPI entirely
1519 if (acpi_blacklisted()) {
1521 printk(KERN_WARNING PREFIX "acpi=force override\n");
1523 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1530 int __init early_acpi_boot_init(void)
1533 * If acpi_disabled, bail out
1539 * Process the Multiple APIC Description Table (MADT), if present
1541 early_acpi_process_madt();
1544 * Hardware-reduced ACPI mode initialization:
1546 acpi_reduced_hw_init();
1551 int __init acpi_boot_init(void)
1553 /* those are executed after early-quirks are executed */
1554 dmi_check_system(acpi_dmi_table_late);
1557 * If acpi_disabled, bail out
1562 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1565 * set sci_int and PM timer address
1567 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1570 * Process the Multiple APIC Description Table (MADT), if present
1572 acpi_process_madt();
1574 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1577 x86_init.pci.init = pci_acpi_init;
1582 static int __init parse_acpi(char *arg)
1587 /* "acpi=off" disables both ACPI table parsing and interpreter */
1588 if (strcmp(arg, "off") == 0) {
1591 /* acpi=force to over-ride black-list */
1592 else if (strcmp(arg, "force") == 0) {
1596 /* acpi=strict disables out-of-spec workarounds */
1597 else if (strcmp(arg, "strict") == 0) {
1600 /* acpi=rsdt use RSDT instead of XSDT */
1601 else if (strcmp(arg, "rsdt") == 0) {
1602 acpi_gbl_do_not_use_xsdt = TRUE;
1604 /* "acpi=noirq" disables ACPI interrupt routing */
1605 else if (strcmp(arg, "noirq") == 0) {
1608 /* "acpi=copy_dsdt" copys DSDT */
1609 else if (strcmp(arg, "copy_dsdt") == 0) {
1610 acpi_gbl_copy_dsdt_locally = 1;
1612 /* "acpi=nocmcff" disables FF mode for corrected errors */
1613 else if (strcmp(arg, "nocmcff") == 0) {
1614 acpi_disable_cmcff = 1;
1616 /* Core will printk when we return error. */
1621 early_param("acpi", parse_acpi);
1623 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1624 static int __init parse_pci(char *arg)
1626 if (arg && strcmp(arg, "noacpi") == 0)
1630 early_param("pci", parse_pci);
1632 int __init acpi_mps_check(void)
1634 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1635 /* mptable code is not built-in*/
1636 if (acpi_disabled || acpi_noirq) {
1637 printk(KERN_WARNING "MPS support code is not built-in.\n"
1638 "Using acpi=off or acpi=noirq or pci=noacpi "
1639 "may have problem\n");
1646 #ifdef CONFIG_X86_IO_APIC
1647 static int __init parse_acpi_skip_timer_override(char *arg)
1649 acpi_skip_timer_override = 1;
1652 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1654 static int __init parse_acpi_use_timer_override(char *arg)
1656 acpi_use_timer_override = 1;
1659 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1660 #endif /* CONFIG_X86_IO_APIC */
1662 static int __init setup_acpi_sci(char *s)
1666 if (!strcmp(s, "edge"))
1667 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1668 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1669 else if (!strcmp(s, "level"))
1670 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1671 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1672 else if (!strcmp(s, "high"))
1673 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1674 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1675 else if (!strcmp(s, "low"))
1676 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1677 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1682 early_param("acpi_sci", setup_acpi_sci);
1684 int __acpi_acquire_global_lock(unsigned int *lock)
1686 unsigned int old, new, val;
1689 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1690 val = cmpxchg(lock, old, new);
1691 } while (unlikely (val != old));
1692 return (new < 3) ? -1 : 0;
1695 int __acpi_release_global_lock(unsigned int *lock)
1697 unsigned int old, new, val;
1701 val = cmpxchg(lock, old, new);
1702 } while (unlikely (val != old));
1706 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1708 e820_add_region(addr, size, E820_ACPI);