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);
459 * stash over-ride to indicate we've been here
460 * and for later update of acpi_gbl_FADT
462 acpi_sci_override_gsi = gsi;
467 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
468 const unsigned long end)
470 struct acpi_madt_interrupt_override *intsrc = NULL;
472 intsrc = (struct acpi_madt_interrupt_override *)header;
474 if (BAD_MADT_ENTRY(intsrc, end))
477 acpi_table_print_madt_entry(header);
479 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
480 acpi_sci_ioapic_setup(intsrc->source_irq,
481 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
482 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
487 if (intsrc->source_irq == 0) {
488 if (acpi_skip_timer_override) {
489 printk(PREFIX "BIOS IRQ0 override ignored.\n");
493 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
494 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
495 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
496 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
500 mp_override_legacy_irq(intsrc->source_irq,
501 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
502 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
509 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
511 struct acpi_madt_nmi_source *nmi_src = NULL;
513 nmi_src = (struct acpi_madt_nmi_source *)header;
515 if (BAD_MADT_ENTRY(nmi_src, end))
518 acpi_table_print_madt_entry(header);
520 /* TBD: Support nimsrc entries? */
525 #endif /* CONFIG_X86_IO_APIC */
528 * acpi_pic_sci_set_trigger()
530 * use ELCR to set PIC-mode trigger type for SCI
532 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
533 * it may require Edge Trigger -- use "acpi_sci=edge"
535 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
536 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
537 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
538 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
541 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
543 unsigned int mask = 1 << irq;
544 unsigned int old, new;
546 /* Real old ELCR mask */
547 old = inb(0x4d0) | (inb(0x4d1) << 8);
550 * If we use ACPI to set PCI IRQs, then we should clear ELCR
551 * since we will set it correctly as we enable the PCI irq
554 new = acpi_noirq ? old : 0;
557 * Update SCI information in the ELCR, it isn't in the PCI
561 case 1: /* Edge - clear */
564 case 3: /* Level - set */
572 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
574 outb(new >> 8, 0x4d1);
577 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
579 int rc, irq, trigger, polarity;
581 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
586 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
588 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
589 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
590 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
599 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
601 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
603 if (isa_irq < nr_legacy_irqs() &&
604 isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
605 *gsi = isa_irq_to_gsi[isa_irq];
612 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
613 int trigger, int polarity)
617 * Make sure all (legacy) PCI IRQs are set as level-triggered.
619 if (trigger == ACPI_LEVEL_SENSITIVE)
620 elcr_set_level_irq(gsi);
626 #ifdef CONFIG_X86_LOCAL_APIC
627 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
628 int trigger, int polarity)
631 #ifdef CONFIG_X86_IO_APIC
633 struct irq_alloc_info info;
635 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
636 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
637 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
638 ioapic_set_alloc_attr(&info, node, trigger, polarity);
640 mutex_lock(&acpi_ioapic_lock);
641 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
642 /* Don't set up the ACPI SCI because it's already set up */
643 if (irq >= 0 && enable_update_mptable &&
644 acpi_gbl_FADT.sci_interrupt != gsi)
645 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
646 mutex_unlock(&acpi_ioapic_lock);
652 static void acpi_unregister_gsi_ioapic(u32 gsi)
654 #ifdef CONFIG_X86_IO_APIC
657 mutex_lock(&acpi_ioapic_lock);
658 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
661 mutex_unlock(&acpi_ioapic_lock);
666 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
667 int trigger, int polarity) = acpi_register_gsi_pic;
668 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
670 #ifdef CONFIG_ACPI_SLEEP
671 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
673 int (*acpi_suspend_lowlevel)(void);
677 * success: return IRQ number (>=0)
678 * failure: return < 0
680 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
682 return __acpi_register_gsi(dev, gsi, trigger, polarity);
684 EXPORT_SYMBOL_GPL(acpi_register_gsi);
686 void acpi_unregister_gsi(u32 gsi)
688 if (__acpi_unregister_gsi)
689 __acpi_unregister_gsi(gsi);
691 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
693 #ifdef CONFIG_X86_LOCAL_APIC
694 static void __init acpi_set_irq_model_ioapic(void)
696 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
697 __acpi_register_gsi = acpi_register_gsi_ioapic;
698 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
704 * ACPI based hotplug support for CPU
706 #ifdef CONFIG_ACPI_HOTPLUG_CPU
707 #include <acpi/processor.h>
709 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
711 #ifdef CONFIG_ACPI_NUMA
714 nid = acpi_get_node(handle);
716 set_apicid_to_node(physid, nid);
717 numa_set_node(cpu, nid);
723 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
727 cpu = acpi_register_lapic(physid, U32_MAX, ACPI_MADT_ENABLED);
729 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
733 acpi_processor_set_pdc(handle);
734 acpi_map_cpu2node(handle, cpu, physid);
739 EXPORT_SYMBOL(acpi_map_cpu);
741 int acpi_unmap_cpu(int cpu)
743 #ifdef CONFIG_ACPI_NUMA
744 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
747 per_cpu(x86_cpu_to_apicid, cpu) = -1;
748 set_cpu_present(cpu, false);
753 EXPORT_SYMBOL(acpi_unmap_cpu);
754 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
756 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
759 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
762 struct ioapic_domain_cfg cfg = {
763 .type = IOAPIC_DOMAIN_DYNAMIC,
764 .ops = &mp_ioapic_irqdomain_ops,
767 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
769 unsigned long long uid;
772 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
774 if (ACPI_FAILURE(status)) {
775 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
778 ioapic_id = (int)uid;
781 mutex_lock(&acpi_ioapic_lock);
782 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
783 mutex_unlock(&acpi_ioapic_lock);
788 EXPORT_SYMBOL(acpi_register_ioapic);
790 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
794 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
795 mutex_lock(&acpi_ioapic_lock);
796 ret = mp_unregister_ioapic(gsi_base);
797 mutex_unlock(&acpi_ioapic_lock);
802 EXPORT_SYMBOL(acpi_unregister_ioapic);
805 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
806 * has been registered
807 * @handle: ACPI handle of the IOAPIC deivce
808 * @gsi_base: GSI base associated with the IOAPIC
810 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
811 * with acpi_register_ioapic()/acpi_unregister_ioapic().
813 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
817 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
818 mutex_lock(&acpi_ioapic_lock);
819 ret = mp_ioapic_registered(gsi_base);
820 mutex_unlock(&acpi_ioapic_lock);
826 static int __init acpi_parse_sbf(struct acpi_table_header *table)
828 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
830 sbf_port = sb->cmos_index; /* Save CMOS port */
835 #ifdef CONFIG_HPET_TIMER
836 #include <asm/hpet.h>
838 static struct resource *hpet_res __initdata;
840 static int __init acpi_parse_hpet(struct acpi_table_header *table)
842 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
844 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
845 printk(KERN_WARNING PREFIX "HPET timers must be located in "
850 hpet_address = hpet_tbl->address.address;
851 hpet_blockid = hpet_tbl->sequence;
854 * Some broken BIOSes advertise HPET at 0x0. We really do not
855 * want to allocate a resource there.
858 printk(KERN_WARNING PREFIX
859 "HPET id: %#x base: %#lx is invalid\n",
860 hpet_tbl->id, hpet_address);
865 * Some even more broken BIOSes advertise HPET at
866 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
869 if (hpet_address == 0xfed0000000000000UL) {
870 if (!hpet_force_user) {
871 printk(KERN_WARNING PREFIX "HPET id: %#x "
872 "base: 0xfed0000000000000 is bogus\n "
873 "try hpet=force on the kernel command line to "
874 "fix it up to 0xfed00000.\n", hpet_tbl->id);
878 printk(KERN_WARNING PREFIX
879 "HPET id: %#x base: 0xfed0000000000000 fixed up "
880 "to 0xfed00000.\n", hpet_tbl->id);
884 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
885 hpet_tbl->id, hpet_address);
888 * Allocate and initialize the HPET firmware resource for adding into
889 * the resource tree during the lateinit timeframe.
891 #define HPET_RESOURCE_NAME_SIZE 9
892 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
894 hpet_res->name = (void *)&hpet_res[1];
895 hpet_res->flags = IORESOURCE_MEM;
896 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
899 hpet_res->start = hpet_address;
900 hpet_res->end = hpet_address + (1 * 1024) - 1;
906 * hpet_insert_resource inserts the HPET resources used into the resource
909 static __init int hpet_insert_resource(void)
914 return insert_resource(&iomem_resource, hpet_res);
917 late_initcall(hpet_insert_resource);
920 #define acpi_parse_hpet NULL
923 static int __init acpi_parse_fadt(struct acpi_table_header *table)
925 if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
926 pr_debug("ACPI: no legacy devices present\n");
927 x86_platform.legacy.devices.pnpbios = 0;
930 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
931 pr_debug("ACPI: not registering RTC platform device\n");
932 x86_platform.legacy.rtc = 0;
935 #ifdef CONFIG_X86_PM_TIMER
936 /* detect the location of the ACPI PM Timer */
937 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
939 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
940 ACPI_ADR_SPACE_SYSTEM_IO)
943 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
945 * "X" fields are optional extensions to the original V1.0
946 * fields, so we must selectively expand V1.0 fields if the
947 * corresponding X field is zero.
950 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
953 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
956 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
962 #ifdef CONFIG_X86_LOCAL_APIC
964 * Parse LAPIC entries in MADT
965 * returns 0 on success, < 0 on error
968 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
972 if (!boot_cpu_has(X86_FEATURE_APIC))
976 * Note that the LAPIC address is obtained from the MADT (32-bit value)
977 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
980 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
981 acpi_parse_lapic_addr_ovr, 0);
983 printk(KERN_ERR PREFIX
984 "Error parsing LAPIC address override entry\n");
988 register_lapic_address(acpi_lapic_addr);
993 static int __init acpi_parse_madt_lapic_entries(void)
998 struct acpi_subtable_proc madt_proc[2];
1000 if (!boot_cpu_has(X86_FEATURE_APIC))
1003 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1004 acpi_parse_sapic, MAX_LOCAL_APIC);
1007 memset(madt_proc, 0, sizeof(madt_proc));
1008 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1009 madt_proc[0].handler = acpi_parse_lapic;
1010 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1011 madt_proc[1].handler = acpi_parse_x2apic;
1012 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1013 sizeof(struct acpi_table_madt),
1014 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1016 printk(KERN_ERR PREFIX
1017 "Error parsing LAPIC/X2APIC entries\n");
1021 count = madt_proc[0].count;
1022 x2count = madt_proc[1].count;
1024 if (!count && !x2count) {
1025 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1026 /* TBD: Cleanup to allow fallback to MPS */
1028 } else if (count < 0 || x2count < 0) {
1029 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1030 /* TBD: Cleanup to allow fallback to MPS */
1034 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1035 acpi_parse_x2apic_nmi, 0);
1036 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1037 acpi_parse_lapic_nmi, 0);
1038 if (count < 0 || x2count < 0) {
1039 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1040 /* TBD: Cleanup to allow fallback to MPS */
1045 #endif /* CONFIG_X86_LOCAL_APIC */
1047 #ifdef CONFIG_X86_IO_APIC
1048 static void __init mp_config_acpi_legacy_irqs(void)
1051 struct mpc_intsrc mp_irq;
1055 * Fabricate the legacy ISA bus (bus #31).
1057 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1059 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1060 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1063 * Use the default configuration for the IRQs 0-15. Unless
1064 * overridden by (MADT) interrupt source override entries.
1066 for (i = 0; i < nr_legacy_irqs(); i++) {
1068 unsigned int dstapic;
1072 /* Locate the gsi that irq i maps to. */
1073 if (acpi_isa_irq_to_gsi(i, &gsi))
1077 * Locate the IOAPIC that manages the ISA IRQ.
1079 ioapic = mp_find_ioapic(gsi);
1082 pin = mp_find_ioapic_pin(ioapic, gsi);
1083 dstapic = mpc_ioapic_id(ioapic);
1085 for (idx = 0; idx < mp_irq_entries; idx++) {
1086 struct mpc_intsrc *irq = mp_irqs + idx;
1088 /* Do we already have a mapping for this ISA IRQ? */
1089 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1092 /* Do we already have a mapping for this IOAPIC pin */
1093 if (irq->dstapic == dstapic && irq->dstirq == pin)
1097 if (idx != mp_irq_entries) {
1098 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1099 continue; /* IRQ already used */
1102 mp_irq.type = MP_INTSRC;
1103 mp_irq.irqflag = 0; /* Conforming */
1104 mp_irq.srcbus = MP_ISA_BUS;
1105 mp_irq.dstapic = dstapic;
1106 mp_irq.irqtype = mp_INT;
1107 mp_irq.srcbusirq = i; /* Identity mapped */
1108 mp_irq.dstirq = pin;
1110 mp_save_irq(&mp_irq);
1115 * Parse IOAPIC related entries in MADT
1116 * returns 0 on success, < 0 on error
1118 static int __init acpi_parse_madt_ioapic_entries(void)
1123 * ACPI interpreter is required to complete interrupt setup,
1124 * so if it is off, don't enumerate the io-apics with ACPI.
1125 * If MPS is present, it will handle them,
1126 * otherwise the system will stay in PIC mode
1128 if (acpi_disabled || acpi_noirq)
1131 if (!boot_cpu_has(X86_FEATURE_APIC))
1135 * if "noapic" boot option, don't look for IO-APICs
1137 if (skip_ioapic_setup) {
1138 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1139 "due to 'noapic' option.\n");
1143 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1146 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1148 } else if (count < 0) {
1149 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1153 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1154 acpi_parse_int_src_ovr, nr_irqs);
1156 printk(KERN_ERR PREFIX
1157 "Error parsing interrupt source overrides entry\n");
1158 /* TBD: Cleanup to allow fallback to MPS */
1163 * If BIOS did not supply an INT_SRC_OVR for the SCI
1164 * pretend we got one so we can set the SCI flags.
1166 if (!acpi_sci_override_gsi)
1167 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1168 acpi_gbl_FADT.sci_interrupt);
1170 /* Fill in identity legacy mappings where no override */
1171 mp_config_acpi_legacy_irqs();
1173 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1174 acpi_parse_nmi_src, nr_irqs);
1176 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1177 /* TBD: Cleanup to allow fallback to MPS */
1184 static inline int acpi_parse_madt_ioapic_entries(void)
1188 #endif /* !CONFIG_X86_IO_APIC */
1190 static void __init early_acpi_process_madt(void)
1192 #ifdef CONFIG_X86_LOCAL_APIC
1195 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1198 * Parse MADT LAPIC entries
1200 error = early_acpi_parse_madt_lapic_addr_ovr();
1203 smp_found_config = 1;
1205 if (error == -EINVAL) {
1207 * Dell Precision Workstation 410, 610 come here.
1209 printk(KERN_ERR PREFIX
1210 "Invalid BIOS MADT, disabling ACPI\n");
1217 static void __init acpi_process_madt(void)
1219 #ifdef CONFIG_X86_LOCAL_APIC
1222 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1225 * Parse MADT LAPIC entries
1227 error = acpi_parse_madt_lapic_entries();
1232 * Parse MADT IO-APIC entries
1234 mutex_lock(&acpi_ioapic_lock);
1235 error = acpi_parse_madt_ioapic_entries();
1236 mutex_unlock(&acpi_ioapic_lock);
1238 acpi_set_irq_model_ioapic();
1240 smp_found_config = 1;
1243 if (error == -EINVAL) {
1245 * Dell Precision Workstation 410, 610 come here.
1247 printk(KERN_ERR PREFIX
1248 "Invalid BIOS MADT, disabling ACPI\n");
1253 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1254 * In the event an MPS table was found, forget it.
1255 * Boot with "acpi=off" to use MPS on such a system.
1257 if (smp_found_config) {
1258 printk(KERN_WARNING PREFIX
1259 "No APIC-table, disabling MPS\n");
1260 smp_found_config = 0;
1265 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1266 * processors, where MPS only supports physical.
1268 if (acpi_lapic && acpi_ioapic)
1269 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1271 else if (acpi_lapic)
1272 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1273 "configuration information\n");
1278 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1281 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1288 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1291 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1298 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1301 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1305 "Warning: DMI blacklist says broken, but acpi forced\n");
1311 * Force ignoring BIOS IRQ0 override
1313 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1315 if (!acpi_skip_timer_override) {
1316 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1318 acpi_skip_timer_override = 1;
1324 * ACPI offers an alternative platform interface model that removes
1325 * ACPI hardware requirements for platforms that do not implement
1326 * the PC Architecture.
1328 * We initialize the Hardware-reduced ACPI model here:
1330 static void __init acpi_reduced_hw_init(void)
1332 if (acpi_gbl_reduced_hardware) {
1334 * Override x86_init functions and bypass legacy pic
1335 * in Hardware-reduced ACPI mode
1337 x86_init.timers.timer_init = x86_init_noop;
1338 x86_init.irqs.pre_vector_init = x86_init_noop;
1339 legacy_pic = &null_legacy_pic;
1344 * If your system is blacklisted here, but you find that acpi=force
1345 * works for you, please contact linux-acpi@vger.kernel.org
1347 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1349 * Boxes that need ACPI disabled
1352 .callback = dmi_disable_acpi,
1353 .ident = "IBM Thinkpad",
1355 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1356 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1361 * Boxes that need ACPI PCI IRQ routing disabled
1364 .callback = disable_acpi_irq,
1365 .ident = "ASUS A7V",
1367 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1368 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1369 /* newer BIOS, Revision 1011, does work */
1370 DMI_MATCH(DMI_BIOS_VERSION,
1371 "ASUS A7V ACPI BIOS Revision 1007"),
1376 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1377 * for LPC bridge, which is needed for the PCI
1378 * interrupt links to work. DSDT fix is in bug 5966.
1379 * 2645, 2646 model numbers are shared with 600/600E/600X
1381 .callback = disable_acpi_irq,
1382 .ident = "IBM Thinkpad 600 Series 2645",
1384 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1385 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1389 .callback = disable_acpi_irq,
1390 .ident = "IBM Thinkpad 600 Series 2646",
1392 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1393 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1397 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1400 .callback = disable_acpi_pci,
1401 .ident = "ASUS PR-DLS",
1403 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1404 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1405 DMI_MATCH(DMI_BIOS_VERSION,
1406 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1407 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1411 .callback = disable_acpi_pci,
1412 .ident = "Acer TravelMate 36x Laptop",
1414 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1415 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1421 /* second table for DMI checks that should run after early-quirks */
1422 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1424 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1425 * which includes some code which overrides all temperature
1426 * trip points to 16C if the INTIN2 input of the I/O APIC
1427 * is enabled. This input is incorrectly designated the
1428 * ISA IRQ 0 via an interrupt source override even though
1429 * it is wired to the output of the master 8259A and INTIN0
1430 * is not connected at all. Force ignoring BIOS IRQ0
1431 * override in that cases.
1434 .callback = dmi_ignore_irq0_timer_override,
1435 .ident = "HP nx6115 laptop",
1437 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1438 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1442 .callback = dmi_ignore_irq0_timer_override,
1443 .ident = "HP NX6125 laptop",
1445 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1446 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1450 .callback = dmi_ignore_irq0_timer_override,
1451 .ident = "HP NX6325 laptop",
1453 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1454 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1458 .callback = dmi_ignore_irq0_timer_override,
1459 .ident = "HP 6715b laptop",
1461 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1462 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1466 .callback = dmi_ignore_irq0_timer_override,
1467 .ident = "FUJITSU SIEMENS",
1469 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1470 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1477 * acpi_boot_table_init() and acpi_boot_init()
1478 * called from setup_arch(), always.
1479 * 1. checksums all tables
1480 * 2. enumerates lapics
1481 * 3. enumerates io-apics
1483 * acpi_table_init() is separate to allow reading SRAT without
1484 * other side effects.
1486 * side effects of acpi_boot_init:
1487 * acpi_lapic = 1 if LAPIC found
1488 * acpi_ioapic = 1 if IOAPIC found
1489 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1490 * if acpi_blacklisted() acpi_disabled = 1;
1491 * acpi_irq_model=...
1495 void __init acpi_boot_table_init(void)
1497 dmi_check_system(acpi_dmi_table);
1500 * If acpi_disabled, bail out
1506 * Initialize the ACPI boot-time table parser.
1508 if (acpi_table_init()) {
1513 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1516 * blacklist may disable ACPI entirely
1518 if (acpi_blacklisted()) {
1520 printk(KERN_WARNING PREFIX "acpi=force override\n");
1522 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1529 int __init early_acpi_boot_init(void)
1532 * If acpi_disabled, bail out
1538 * Process the Multiple APIC Description Table (MADT), if present
1540 early_acpi_process_madt();
1543 * Hardware-reduced ACPI mode initialization:
1545 acpi_reduced_hw_init();
1550 int __init acpi_boot_init(void)
1552 /* those are executed after early-quirks are executed */
1553 dmi_check_system(acpi_dmi_table_late);
1556 * If acpi_disabled, bail out
1561 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1564 * set sci_int and PM timer address
1566 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1569 * Process the Multiple APIC Description Table (MADT), if present
1571 acpi_process_madt();
1573 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1576 x86_init.pci.init = pci_acpi_init;
1581 static int __init parse_acpi(char *arg)
1586 /* "acpi=off" disables both ACPI table parsing and interpreter */
1587 if (strcmp(arg, "off") == 0) {
1590 /* acpi=force to over-ride black-list */
1591 else if (strcmp(arg, "force") == 0) {
1595 /* acpi=strict disables out-of-spec workarounds */
1596 else if (strcmp(arg, "strict") == 0) {
1599 /* acpi=rsdt use RSDT instead of XSDT */
1600 else if (strcmp(arg, "rsdt") == 0) {
1601 acpi_gbl_do_not_use_xsdt = TRUE;
1603 /* "acpi=noirq" disables ACPI interrupt routing */
1604 else if (strcmp(arg, "noirq") == 0) {
1607 /* "acpi=copy_dsdt" copys DSDT */
1608 else if (strcmp(arg, "copy_dsdt") == 0) {
1609 acpi_gbl_copy_dsdt_locally = 1;
1611 /* "acpi=nocmcff" disables FF mode for corrected errors */
1612 else if (strcmp(arg, "nocmcff") == 0) {
1613 acpi_disable_cmcff = 1;
1615 /* Core will printk when we return error. */
1620 early_param("acpi", parse_acpi);
1622 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1623 static int __init parse_pci(char *arg)
1625 if (arg && strcmp(arg, "noacpi") == 0)
1629 early_param("pci", parse_pci);
1631 int __init acpi_mps_check(void)
1633 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1634 /* mptable code is not built-in*/
1635 if (acpi_disabled || acpi_noirq) {
1636 printk(KERN_WARNING "MPS support code is not built-in.\n"
1637 "Using acpi=off or acpi=noirq or pci=noacpi "
1638 "may have problem\n");
1645 #ifdef CONFIG_X86_IO_APIC
1646 static int __init parse_acpi_skip_timer_override(char *arg)
1648 acpi_skip_timer_override = 1;
1651 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1653 static int __init parse_acpi_use_timer_override(char *arg)
1655 acpi_use_timer_override = 1;
1658 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1659 #endif /* CONFIG_X86_IO_APIC */
1661 static int __init setup_acpi_sci(char *s)
1665 if (!strcmp(s, "edge"))
1666 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1667 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1668 else if (!strcmp(s, "level"))
1669 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1670 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1671 else if (!strcmp(s, "high"))
1672 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1673 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1674 else if (!strcmp(s, "low"))
1675 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1676 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1681 early_param("acpi_sci", setup_acpi_sci);
1683 int __acpi_acquire_global_lock(unsigned int *lock)
1685 unsigned int old, new, val;
1688 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1689 val = cmpxchg(lock, old, new);
1690 } while (unlikely (val != old));
1691 return (new < 3) ? -1 : 0;
1694 int __acpi_release_global_lock(unsigned int *lock)
1696 unsigned int old, new, val;
1700 val = cmpxchg(lock, old, new);
1701 } while (unlikely (val != old));
1705 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1707 e820_add_region(addr, size, E820_ACPI);