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/module.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;
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 * @enabled: this cpu is enabled or not
166 * Returns the logic cpu number which maps to the local apic
168 static int acpi_register_lapic(int id, u8 enabled)
170 unsigned int ver = 0;
172 if (id >= MAX_LOCAL_APIC) {
173 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
182 if (boot_cpu_physical_apicid != -1U)
183 ver = apic_version[boot_cpu_physical_apicid];
185 return generic_processor_info(id, ver);
189 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
191 struct acpi_madt_local_x2apic *processor = NULL;
195 processor = (struct acpi_madt_local_x2apic *)header;
197 if (BAD_MADT_ENTRY(processor, end))
200 acpi_table_print_madt_entry(header);
202 apic_id = processor->local_apic_id;
203 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
204 #ifdef CONFIG_X86_X2APIC
206 * We need to register disabled CPU as well to permit
207 * counting disabled CPUs. This allows us to size
208 * cpus_possible_map more accurately, to permit
209 * to not preallocating memory for all NR_CPUS
210 * when we use CPU hotplug.
212 if (!apic->apic_id_valid(apic_id) && enabled)
213 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
215 acpi_register_lapic(apic_id, enabled);
217 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
224 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
226 struct acpi_madt_local_apic *processor = NULL;
228 processor = (struct acpi_madt_local_apic *)header;
230 if (BAD_MADT_ENTRY(processor, end))
233 acpi_table_print_madt_entry(header);
236 * We need to register disabled CPU as well to permit
237 * counting disabled CPUs. This allows us to size
238 * cpus_possible_map more accurately, to permit
239 * to not preallocating memory for all NR_CPUS
240 * when we use CPU hotplug.
242 acpi_register_lapic(processor->id, /* APIC ID */
243 processor->lapic_flags & ACPI_MADT_ENABLED);
249 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
251 struct acpi_madt_local_sapic *processor = NULL;
253 processor = (struct acpi_madt_local_sapic *)header;
255 if (BAD_MADT_ENTRY(processor, end))
258 acpi_table_print_madt_entry(header);
260 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
261 processor->lapic_flags & ACPI_MADT_ENABLED);
267 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
268 const unsigned long end)
270 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
272 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
274 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
277 acpi_lapic_addr = lapic_addr_ovr->address;
283 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
284 const unsigned long end)
286 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
288 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
290 if (BAD_MADT_ENTRY(x2apic_nmi, end))
293 acpi_table_print_madt_entry(header);
295 if (x2apic_nmi->lint != 1)
296 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
302 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
304 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
306 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
308 if (BAD_MADT_ENTRY(lapic_nmi, end))
311 acpi_table_print_madt_entry(header);
313 if (lapic_nmi->lint != 1)
314 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
319 #endif /*CONFIG_X86_LOCAL_APIC */
321 #ifdef CONFIG_X86_IO_APIC
324 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
325 u8 trigger, u32 gsi);
327 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
331 * Check bus_irq boundary.
333 if (bus_irq >= NR_IRQS_LEGACY) {
334 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
339 * TBD: This check is for faulty timer entries, where the override
340 * erroneously sets the trigger to level, resulting in a HUGE
341 * increase of timer interrupts!
343 if ((bus_irq == 0) && (trigger == 3))
346 if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
349 * Reset default identity mapping if gsi is also an legacy IRQ,
350 * otherwise there will be more than one entry with the same GSI
351 * and acpi_isa_irq_to_gsi() may give wrong result.
353 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
354 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
355 isa_irq_to_gsi[bus_irq] = gsi;
358 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
361 #ifdef CONFIG_X86_MPPARSE
362 struct mpc_intsrc mp_irq;
363 struct pci_dev *pdev;
364 unsigned char number;
371 if (!dev || !dev_is_pci(dev))
374 pdev = to_pci_dev(dev);
375 number = pdev->bus->number;
378 /* print the entry should happen on mptable identically */
379 mp_irq.type = MP_INTSRC;
380 mp_irq.irqtype = mp_INT;
381 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
382 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
383 mp_irq.srcbus = number;
384 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
385 ioapic = mp_find_ioapic(gsi);
386 mp_irq.dstapic = mpc_ioapic_id(ioapic);
387 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
389 mp_save_irq(&mp_irq);
394 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
397 struct mpc_intsrc mp_irq;
400 /* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
401 ioapic = mp_find_ioapic(gsi);
403 pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
407 pin = mp_find_ioapic_pin(ioapic, gsi);
409 mp_irq.type = MP_INTSRC;
410 mp_irq.irqtype = mp_INT;
411 mp_irq.irqflag = (trigger << 2) | polarity;
412 mp_irq.srcbus = MP_ISA_BUS;
413 mp_irq.srcbusirq = bus_irq;
414 mp_irq.dstapic = mpc_ioapic_id(ioapic);
417 mp_save_irq(&mp_irq);
423 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
425 struct acpi_madt_io_apic *ioapic = NULL;
426 struct ioapic_domain_cfg cfg = {
427 .type = IOAPIC_DOMAIN_DYNAMIC,
428 .ops = &mp_ioapic_irqdomain_ops,
431 ioapic = (struct acpi_madt_io_apic *)header;
433 if (BAD_MADT_ENTRY(ioapic, end))
436 acpi_table_print_madt_entry(header);
438 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
439 if (ioapic->global_irq_base < nr_legacy_irqs())
440 cfg.type = IOAPIC_DOMAIN_LEGACY;
442 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
449 * Parse Interrupt Source Override for the ACPI SCI
451 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
453 if (trigger == 0) /* compatible SCI trigger is level */
456 if (polarity == 0) /* compatible SCI polarity is low */
459 /* Command-line over-ride via acpi_sci= */
460 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
461 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
463 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
464 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
466 if (bus_irq < NR_IRQS_LEGACY)
467 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
469 mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
471 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
474 * stash over-ride to indicate we've been here
475 * and for later update of acpi_gbl_FADT
477 acpi_sci_override_gsi = gsi;
482 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
483 const unsigned long end)
485 struct acpi_madt_interrupt_override *intsrc = NULL;
487 intsrc = (struct acpi_madt_interrupt_override *)header;
489 if (BAD_MADT_ENTRY(intsrc, end))
492 acpi_table_print_madt_entry(header);
494 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
495 acpi_sci_ioapic_setup(intsrc->source_irq,
496 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
497 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
502 if (intsrc->source_irq == 0) {
503 if (acpi_skip_timer_override) {
504 printk(PREFIX "BIOS IRQ0 override ignored.\n");
508 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
509 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
510 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
511 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
515 mp_override_legacy_irq(intsrc->source_irq,
516 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
517 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
524 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
526 struct acpi_madt_nmi_source *nmi_src = NULL;
528 nmi_src = (struct acpi_madt_nmi_source *)header;
530 if (BAD_MADT_ENTRY(nmi_src, end))
533 acpi_table_print_madt_entry(header);
535 /* TBD: Support nimsrc entries? */
540 #endif /* CONFIG_X86_IO_APIC */
543 * acpi_pic_sci_set_trigger()
545 * use ELCR to set PIC-mode trigger type for SCI
547 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
548 * it may require Edge Trigger -- use "acpi_sci=edge"
550 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
551 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
552 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
553 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
556 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
558 unsigned int mask = 1 << irq;
559 unsigned int old, new;
561 /* Real old ELCR mask */
562 old = inb(0x4d0) | (inb(0x4d1) << 8);
565 * If we use ACPI to set PCI IRQs, then we should clear ELCR
566 * since we will set it correctly as we enable the PCI irq
569 new = acpi_noirq ? old : 0;
572 * Update SCI information in the ELCR, it isn't in the PCI
576 case 1: /* Edge - clear */
579 case 3: /* Level - set */
587 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
589 outb(new >> 8, 0x4d1);
592 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
594 int rc, irq, trigger, polarity;
596 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
601 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
603 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
604 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
605 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
614 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
616 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
618 if (isa_irq < nr_legacy_irqs() &&
619 isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
620 *gsi = isa_irq_to_gsi[isa_irq];
627 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
628 int trigger, int polarity)
632 * Make sure all (legacy) PCI IRQs are set as level-triggered.
634 if (trigger == ACPI_LEVEL_SENSITIVE)
635 elcr_set_level_irq(gsi);
641 #ifdef CONFIG_X86_LOCAL_APIC
642 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
643 int trigger, int polarity)
646 #ifdef CONFIG_X86_IO_APIC
648 struct irq_alloc_info info;
650 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
651 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
652 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
653 ioapic_set_alloc_attr(&info, node, trigger, polarity);
655 mutex_lock(&acpi_ioapic_lock);
656 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
657 /* Don't set up the ACPI SCI because it's already set up */
658 if (irq >= 0 && enable_update_mptable &&
659 acpi_gbl_FADT.sci_interrupt != gsi)
660 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
661 mutex_unlock(&acpi_ioapic_lock);
667 static void acpi_unregister_gsi_ioapic(u32 gsi)
669 #ifdef CONFIG_X86_IO_APIC
672 mutex_lock(&acpi_ioapic_lock);
673 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
676 mutex_unlock(&acpi_ioapic_lock);
681 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
682 int trigger, int polarity) = acpi_register_gsi_pic;
683 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
685 #ifdef CONFIG_ACPI_SLEEP
686 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
688 int (*acpi_suspend_lowlevel)(void);
692 * success: return IRQ number (>=0)
693 * failure: return < 0
695 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
697 return __acpi_register_gsi(dev, gsi, trigger, polarity);
699 EXPORT_SYMBOL_GPL(acpi_register_gsi);
701 void acpi_unregister_gsi(u32 gsi)
703 if (__acpi_unregister_gsi)
704 __acpi_unregister_gsi(gsi);
706 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
708 #ifdef CONFIG_X86_LOCAL_APIC
709 static void __init acpi_set_irq_model_ioapic(void)
711 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
712 __acpi_register_gsi = acpi_register_gsi_ioapic;
713 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
719 * ACPI based hotplug support for CPU
721 #ifdef CONFIG_ACPI_HOTPLUG_CPU
722 #include <acpi/processor.h>
724 static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
726 #ifdef CONFIG_ACPI_NUMA
729 nid = acpi_get_node(handle);
731 set_apicid_to_node(physid, nid);
732 numa_set_node(cpu, nid);
737 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
741 cpu = acpi_register_lapic(physid, ACPI_MADT_ENABLED);
743 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
747 acpi_processor_set_pdc(handle);
748 acpi_map_cpu2node(handle, cpu, physid);
753 EXPORT_SYMBOL(acpi_map_cpu);
755 int acpi_unmap_cpu(int cpu)
757 #ifdef CONFIG_ACPI_NUMA
758 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
761 per_cpu(x86_cpu_to_apicid, cpu) = -1;
762 set_cpu_present(cpu, false);
767 EXPORT_SYMBOL(acpi_unmap_cpu);
768 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
770 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
773 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
776 struct ioapic_domain_cfg cfg = {
777 .type = IOAPIC_DOMAIN_DYNAMIC,
778 .ops = &mp_ioapic_irqdomain_ops,
781 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
783 unsigned long long uid;
786 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
788 if (ACPI_FAILURE(status)) {
789 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
792 ioapic_id = (int)uid;
795 mutex_lock(&acpi_ioapic_lock);
796 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
797 mutex_unlock(&acpi_ioapic_lock);
802 EXPORT_SYMBOL(acpi_register_ioapic);
804 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
808 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
809 mutex_lock(&acpi_ioapic_lock);
810 ret = mp_unregister_ioapic(gsi_base);
811 mutex_unlock(&acpi_ioapic_lock);
816 EXPORT_SYMBOL(acpi_unregister_ioapic);
819 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
820 * has been registered
821 * @handle: ACPI handle of the IOAPIC deivce
822 * @gsi_base: GSI base associated with the IOAPIC
824 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
825 * with acpi_register_ioapic()/acpi_unregister_ioapic().
827 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
831 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
832 mutex_lock(&acpi_ioapic_lock);
833 ret = mp_ioapic_registered(gsi_base);
834 mutex_unlock(&acpi_ioapic_lock);
840 static int __init acpi_parse_sbf(struct acpi_table_header *table)
842 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
844 sbf_port = sb->cmos_index; /* Save CMOS port */
849 #ifdef CONFIG_HPET_TIMER
850 #include <asm/hpet.h>
852 static struct resource *hpet_res __initdata;
854 static int __init acpi_parse_hpet(struct acpi_table_header *table)
856 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
858 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
859 printk(KERN_WARNING PREFIX "HPET timers must be located in "
864 hpet_address = hpet_tbl->address.address;
865 hpet_blockid = hpet_tbl->sequence;
868 * Some broken BIOSes advertise HPET at 0x0. We really do not
869 * want to allocate a resource there.
872 printk(KERN_WARNING PREFIX
873 "HPET id: %#x base: %#lx is invalid\n",
874 hpet_tbl->id, hpet_address);
879 * Some even more broken BIOSes advertise HPET at
880 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
883 if (hpet_address == 0xfed0000000000000UL) {
884 if (!hpet_force_user) {
885 printk(KERN_WARNING PREFIX "HPET id: %#x "
886 "base: 0xfed0000000000000 is bogus\n "
887 "try hpet=force on the kernel command line to "
888 "fix it up to 0xfed00000.\n", hpet_tbl->id);
892 printk(KERN_WARNING PREFIX
893 "HPET id: %#x base: 0xfed0000000000000 fixed up "
894 "to 0xfed00000.\n", hpet_tbl->id);
898 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
899 hpet_tbl->id, hpet_address);
902 * Allocate and initialize the HPET firmware resource for adding into
903 * the resource tree during the lateinit timeframe.
905 #define HPET_RESOURCE_NAME_SIZE 9
906 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
908 hpet_res->name = (void *)&hpet_res[1];
909 hpet_res->flags = IORESOURCE_MEM;
910 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
913 hpet_res->start = hpet_address;
914 hpet_res->end = hpet_address + (1 * 1024) - 1;
920 * hpet_insert_resource inserts the HPET resources used into the resource
923 static __init int hpet_insert_resource(void)
928 return insert_resource(&iomem_resource, hpet_res);
931 late_initcall(hpet_insert_resource);
934 #define acpi_parse_hpet NULL
937 static int __init acpi_parse_fadt(struct acpi_table_header *table)
940 #ifdef CONFIG_X86_PM_TIMER
941 /* detect the location of the ACPI PM Timer */
942 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
944 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
945 ACPI_ADR_SPACE_SYSTEM_IO)
948 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
950 * "X" fields are optional extensions to the original V1.0
951 * fields, so we must selectively expand V1.0 fields if the
952 * corresponding X field is zero.
955 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
958 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
961 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
967 #ifdef CONFIG_X86_LOCAL_APIC
969 * Parse LAPIC entries in MADT
970 * returns 0 on success, < 0 on error
973 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
981 * Note that the LAPIC address is obtained from the MADT (32-bit value)
982 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
985 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
986 acpi_parse_lapic_addr_ovr, 0);
988 printk(KERN_ERR PREFIX
989 "Error parsing LAPIC address override entry\n");
993 register_lapic_address(acpi_lapic_addr);
998 static int __init acpi_parse_madt_lapic_entries(void)
1003 struct acpi_subtable_proc madt_proc[2];
1009 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1010 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
1013 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1014 acpi_parse_lapic_addr_ovr, 0);
1016 printk(KERN_ERR PREFIX
1017 "Error parsing LAPIC address override entry\n");
1021 register_lapic_address(acpi_lapic_addr);
1023 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1024 acpi_parse_sapic, MAX_LOCAL_APIC);
1027 memset(madt_proc, 0, sizeof(madt_proc));
1028 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1029 madt_proc[0].handler = acpi_parse_lapic;
1030 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1031 madt_proc[1].handler = acpi_parse_x2apic;
1032 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1033 sizeof(struct acpi_table_madt),
1034 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1036 printk(KERN_ERR PREFIX
1037 "Error parsing LAPIC/X2APIC entries\n");
1041 x2count = madt_proc[0].count;
1042 count = madt_proc[1].count;
1044 if (!count && !x2count) {
1045 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1046 /* TBD: Cleanup to allow fallback to MPS */
1048 } else if (count < 0 || x2count < 0) {
1049 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1050 /* TBD: Cleanup to allow fallback to MPS */
1054 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1055 acpi_parse_x2apic_nmi, 0);
1056 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1057 acpi_parse_lapic_nmi, 0);
1058 if (count < 0 || x2count < 0) {
1059 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1060 /* TBD: Cleanup to allow fallback to MPS */
1065 #endif /* CONFIG_X86_LOCAL_APIC */
1067 #ifdef CONFIG_X86_IO_APIC
1068 static void __init mp_config_acpi_legacy_irqs(void)
1071 struct mpc_intsrc mp_irq;
1075 * Fabricate the legacy ISA bus (bus #31).
1077 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1079 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1080 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1083 * Use the default configuration for the IRQs 0-15. Unless
1084 * overridden by (MADT) interrupt source override entries.
1086 for (i = 0; i < nr_legacy_irqs(); i++) {
1088 unsigned int dstapic;
1092 /* Locate the gsi that irq i maps to. */
1093 if (acpi_isa_irq_to_gsi(i, &gsi))
1097 * Locate the IOAPIC that manages the ISA IRQ.
1099 ioapic = mp_find_ioapic(gsi);
1102 pin = mp_find_ioapic_pin(ioapic, gsi);
1103 dstapic = mpc_ioapic_id(ioapic);
1105 for (idx = 0; idx < mp_irq_entries; idx++) {
1106 struct mpc_intsrc *irq = mp_irqs + idx;
1108 /* Do we already have a mapping for this ISA IRQ? */
1109 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1112 /* Do we already have a mapping for this IOAPIC pin */
1113 if (irq->dstapic == dstapic && irq->dstirq == pin)
1117 if (idx != mp_irq_entries) {
1118 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1119 continue; /* IRQ already used */
1122 mp_irq.type = MP_INTSRC;
1123 mp_irq.irqflag = 0; /* Conforming */
1124 mp_irq.srcbus = MP_ISA_BUS;
1125 mp_irq.dstapic = dstapic;
1126 mp_irq.irqtype = mp_INT;
1127 mp_irq.srcbusirq = i; /* Identity mapped */
1128 mp_irq.dstirq = pin;
1130 mp_save_irq(&mp_irq);
1135 * Parse IOAPIC related entries in MADT
1136 * returns 0 on success, < 0 on error
1138 static int __init acpi_parse_madt_ioapic_entries(void)
1143 * ACPI interpreter is required to complete interrupt setup,
1144 * so if it is off, don't enumerate the io-apics with ACPI.
1145 * If MPS is present, it will handle them,
1146 * otherwise the system will stay in PIC mode
1148 if (acpi_disabled || acpi_noirq)
1155 * if "noapic" boot option, don't look for IO-APICs
1157 if (skip_ioapic_setup) {
1158 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1159 "due to 'noapic' option.\n");
1163 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1166 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1168 } else if (count < 0) {
1169 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1173 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1174 acpi_parse_int_src_ovr, nr_irqs);
1176 printk(KERN_ERR PREFIX
1177 "Error parsing interrupt source overrides entry\n");
1178 /* TBD: Cleanup to allow fallback to MPS */
1183 * If BIOS did not supply an INT_SRC_OVR for the SCI
1184 * pretend we got one so we can set the SCI flags.
1186 if (!acpi_sci_override_gsi)
1187 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1188 acpi_gbl_FADT.sci_interrupt);
1190 /* Fill in identity legacy mappings where no override */
1191 mp_config_acpi_legacy_irqs();
1193 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1194 acpi_parse_nmi_src, nr_irqs);
1196 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1197 /* TBD: Cleanup to allow fallback to MPS */
1204 static inline int acpi_parse_madt_ioapic_entries(void)
1208 #endif /* !CONFIG_X86_IO_APIC */
1210 static void __init early_acpi_process_madt(void)
1212 #ifdef CONFIG_X86_LOCAL_APIC
1215 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1218 * Parse MADT LAPIC entries
1220 error = early_acpi_parse_madt_lapic_addr_ovr();
1223 smp_found_config = 1;
1225 if (error == -EINVAL) {
1227 * Dell Precision Workstation 410, 610 come here.
1229 printk(KERN_ERR PREFIX
1230 "Invalid BIOS MADT, disabling ACPI\n");
1237 static void __init acpi_process_madt(void)
1239 #ifdef CONFIG_X86_LOCAL_APIC
1242 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1245 * Parse MADT LAPIC entries
1247 error = acpi_parse_madt_lapic_entries();
1252 * Parse MADT IO-APIC entries
1254 mutex_lock(&acpi_ioapic_lock);
1255 error = acpi_parse_madt_ioapic_entries();
1256 mutex_unlock(&acpi_ioapic_lock);
1258 acpi_set_irq_model_ioapic();
1260 smp_found_config = 1;
1263 if (error == -EINVAL) {
1265 * Dell Precision Workstation 410, 610 come here.
1267 printk(KERN_ERR PREFIX
1268 "Invalid BIOS MADT, disabling ACPI\n");
1273 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1274 * In the event an MPS table was found, forget it.
1275 * Boot with "acpi=off" to use MPS on such a system.
1277 if (smp_found_config) {
1278 printk(KERN_WARNING PREFIX
1279 "No APIC-table, disabling MPS\n");
1280 smp_found_config = 0;
1285 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1286 * processors, where MPS only supports physical.
1288 if (acpi_lapic && acpi_ioapic)
1289 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1291 else if (acpi_lapic)
1292 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1293 "configuration information\n");
1298 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1301 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1308 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1311 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1318 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1321 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1325 "Warning: DMI blacklist says broken, but acpi forced\n");
1331 * Force ignoring BIOS IRQ0 override
1333 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1335 if (!acpi_skip_timer_override) {
1336 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1338 acpi_skip_timer_override = 1;
1344 * ACPI offers an alternative platform interface model that removes
1345 * ACPI hardware requirements for platforms that do not implement
1346 * the PC Architecture.
1348 * We initialize the Hardware-reduced ACPI model here:
1350 static void __init acpi_reduced_hw_init(void)
1352 if (acpi_gbl_reduced_hardware) {
1354 * Override x86_init functions and bypass legacy pic
1355 * in Hardware-reduced ACPI mode
1357 x86_init.timers.timer_init = x86_init_noop;
1358 x86_init.irqs.pre_vector_init = x86_init_noop;
1359 legacy_pic = &null_legacy_pic;
1364 * If your system is blacklisted here, but you find that acpi=force
1365 * works for you, please contact linux-acpi@vger.kernel.org
1367 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1369 * Boxes that need ACPI disabled
1372 .callback = dmi_disable_acpi,
1373 .ident = "IBM Thinkpad",
1375 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1376 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1381 * Boxes that need ACPI PCI IRQ routing disabled
1384 .callback = disable_acpi_irq,
1385 .ident = "ASUS A7V",
1387 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1388 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1389 /* newer BIOS, Revision 1011, does work */
1390 DMI_MATCH(DMI_BIOS_VERSION,
1391 "ASUS A7V ACPI BIOS Revision 1007"),
1396 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1397 * for LPC bridge, which is needed for the PCI
1398 * interrupt links to work. DSDT fix is in bug 5966.
1399 * 2645, 2646 model numbers are shared with 600/600E/600X
1401 .callback = disable_acpi_irq,
1402 .ident = "IBM Thinkpad 600 Series 2645",
1404 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1405 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1409 .callback = disable_acpi_irq,
1410 .ident = "IBM Thinkpad 600 Series 2646",
1412 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1413 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1417 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1420 .callback = disable_acpi_pci,
1421 .ident = "ASUS PR-DLS",
1423 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1424 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1425 DMI_MATCH(DMI_BIOS_VERSION,
1426 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1427 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1431 .callback = disable_acpi_pci,
1432 .ident = "Acer TravelMate 36x Laptop",
1434 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1435 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1441 /* second table for DMI checks that should run after early-quirks */
1442 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1444 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1445 * which includes some code which overrides all temperature
1446 * trip points to 16C if the INTIN2 input of the I/O APIC
1447 * is enabled. This input is incorrectly designated the
1448 * ISA IRQ 0 via an interrupt source override even though
1449 * it is wired to the output of the master 8259A and INTIN0
1450 * is not connected at all. Force ignoring BIOS IRQ0
1451 * override in that cases.
1454 .callback = dmi_ignore_irq0_timer_override,
1455 .ident = "HP nx6115 laptop",
1457 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1458 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1462 .callback = dmi_ignore_irq0_timer_override,
1463 .ident = "HP NX6125 laptop",
1465 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1466 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1470 .callback = dmi_ignore_irq0_timer_override,
1471 .ident = "HP NX6325 laptop",
1473 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1474 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1478 .callback = dmi_ignore_irq0_timer_override,
1479 .ident = "HP 6715b laptop",
1481 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1482 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1486 .callback = dmi_ignore_irq0_timer_override,
1487 .ident = "FUJITSU SIEMENS",
1489 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1490 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1497 * acpi_boot_table_init() and acpi_boot_init()
1498 * called from setup_arch(), always.
1499 * 1. checksums all tables
1500 * 2. enumerates lapics
1501 * 3. enumerates io-apics
1503 * acpi_table_init() is separate to allow reading SRAT without
1504 * other side effects.
1506 * side effects of acpi_boot_init:
1507 * acpi_lapic = 1 if LAPIC found
1508 * acpi_ioapic = 1 if IOAPIC found
1509 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1510 * if acpi_blacklisted() acpi_disabled = 1;
1511 * acpi_irq_model=...
1515 void __init acpi_boot_table_init(void)
1517 dmi_check_system(acpi_dmi_table);
1520 * If acpi_disabled, bail out
1526 * Initialize the ACPI boot-time table parser.
1528 if (acpi_table_init()) {
1533 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1536 * blacklist may disable ACPI entirely
1538 if (acpi_blacklisted()) {
1540 printk(KERN_WARNING PREFIX "acpi=force override\n");
1542 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1549 int __init early_acpi_boot_init(void)
1552 * If acpi_disabled, bail out
1558 * Process the Multiple APIC Description Table (MADT), if present
1560 early_acpi_process_madt();
1563 * Hardware-reduced ACPI mode initialization:
1565 acpi_reduced_hw_init();
1570 int __init acpi_boot_init(void)
1572 /* those are executed after early-quirks are executed */
1573 dmi_check_system(acpi_dmi_table_late);
1576 * If acpi_disabled, bail out
1581 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1584 * set sci_int and PM timer address
1586 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1589 * Process the Multiple APIC Description Table (MADT), if present
1591 acpi_process_madt();
1593 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1596 x86_init.pci.init = pci_acpi_init;
1601 static int __init parse_acpi(char *arg)
1606 /* "acpi=off" disables both ACPI table parsing and interpreter */
1607 if (strcmp(arg, "off") == 0) {
1610 /* acpi=force to over-ride black-list */
1611 else if (strcmp(arg, "force") == 0) {
1615 /* acpi=strict disables out-of-spec workarounds */
1616 else if (strcmp(arg, "strict") == 0) {
1619 /* acpi=rsdt use RSDT instead of XSDT */
1620 else if (strcmp(arg, "rsdt") == 0) {
1621 acpi_gbl_do_not_use_xsdt = TRUE;
1623 /* "acpi=noirq" disables ACPI interrupt routing */
1624 else if (strcmp(arg, "noirq") == 0) {
1627 /* "acpi=copy_dsdt" copys DSDT */
1628 else if (strcmp(arg, "copy_dsdt") == 0) {
1629 acpi_gbl_copy_dsdt_locally = 1;
1631 /* "acpi=nocmcff" disables FF mode for corrected errors */
1632 else if (strcmp(arg, "nocmcff") == 0) {
1633 acpi_disable_cmcff = 1;
1635 /* Core will printk when we return error. */
1640 early_param("acpi", parse_acpi);
1642 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1643 static int __init parse_pci(char *arg)
1645 if (arg && strcmp(arg, "noacpi") == 0)
1649 early_param("pci", parse_pci);
1651 int __init acpi_mps_check(void)
1653 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1654 /* mptable code is not built-in*/
1655 if (acpi_disabled || acpi_noirq) {
1656 printk(KERN_WARNING "MPS support code is not built-in.\n"
1657 "Using acpi=off or acpi=noirq or pci=noacpi "
1658 "may have problem\n");
1665 #ifdef CONFIG_X86_IO_APIC
1666 static int __init parse_acpi_skip_timer_override(char *arg)
1668 acpi_skip_timer_override = 1;
1671 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1673 static int __init parse_acpi_use_timer_override(char *arg)
1675 acpi_use_timer_override = 1;
1678 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1679 #endif /* CONFIG_X86_IO_APIC */
1681 static int __init setup_acpi_sci(char *s)
1685 if (!strcmp(s, "edge"))
1686 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1687 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1688 else if (!strcmp(s, "level"))
1689 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1690 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1691 else if (!strcmp(s, "high"))
1692 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1693 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1694 else if (!strcmp(s, "low"))
1695 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1696 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1701 early_param("acpi_sci", setup_acpi_sci);
1703 int __acpi_acquire_global_lock(unsigned int *lock)
1705 unsigned int old, new, val;
1708 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1709 val = cmpxchg(lock, old, new);
1710 } while (unlikely (val != old));
1711 return ((new & 0x3) < 3) ? -1 : 0;
1714 int __acpi_release_global_lock(unsigned int *lock)
1716 unsigned int old, new, val;
1720 val = cmpxchg(lock, old, new);
1721 } while (unlikely (val != old));
1725 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1727 e820_add_region(addr, size, E820_ACPI);