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");
184 if (boot_cpu_physical_apicid != -1U)
185 ver = boot_cpu_apic_version;
187 cpu = generic_processor_info(id, ver);
189 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
195 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
197 struct acpi_madt_local_x2apic *processor = NULL;
201 processor = (struct acpi_madt_local_x2apic *)header;
203 if (BAD_MADT_ENTRY(processor, end))
206 acpi_table_print_madt_entry(header);
208 apic_id = processor->local_apic_id;
209 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
210 #ifdef CONFIG_X86_X2APIC
212 * We need to register disabled CPU as well to permit
213 * counting disabled CPUs. This allows us to size
214 * cpus_possible_map more accurately, to permit
215 * to not preallocating memory for all NR_CPUS
216 * when we use CPU hotplug.
218 if (!apic->apic_id_valid(apic_id) && enabled)
219 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
221 acpi_register_lapic(apic_id, processor->uid, enabled);
223 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
230 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
232 struct acpi_madt_local_apic *processor = NULL;
234 processor = (struct acpi_madt_local_apic *)header;
236 if (BAD_MADT_ENTRY(processor, end))
239 acpi_table_print_madt_entry(header);
241 /* Ignore invalid ID */
242 if (processor->id == 0xff)
246 * We need to register disabled CPU as well to permit
247 * counting disabled CPUs. This allows us to size
248 * cpus_possible_map more accurately, to permit
249 * to not preallocating memory for all NR_CPUS
250 * when we use CPU hotplug.
252 acpi_register_lapic(processor->id, /* APIC ID */
253 processor->processor_id, /* ACPI ID */
254 processor->lapic_flags & ACPI_MADT_ENABLED);
260 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
262 struct acpi_madt_local_sapic *processor = NULL;
264 processor = (struct acpi_madt_local_sapic *)header;
266 if (BAD_MADT_ENTRY(processor, end))
269 acpi_table_print_madt_entry(header);
271 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
272 processor->processor_id, /* ACPI ID */
273 processor->lapic_flags & ACPI_MADT_ENABLED);
279 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
280 const unsigned long end)
282 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
284 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
286 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
289 acpi_table_print_madt_entry(header);
291 acpi_lapic_addr = lapic_addr_ovr->address;
297 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
298 const unsigned long end)
300 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
302 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
304 if (BAD_MADT_ENTRY(x2apic_nmi, end))
307 acpi_table_print_madt_entry(header);
309 if (x2apic_nmi->lint != 1)
310 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
316 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
318 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
320 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
322 if (BAD_MADT_ENTRY(lapic_nmi, end))
325 acpi_table_print_madt_entry(header);
327 if (lapic_nmi->lint != 1)
328 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
333 #endif /*CONFIG_X86_LOCAL_APIC */
335 #ifdef CONFIG_X86_IO_APIC
338 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
339 u8 trigger, u32 gsi);
341 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
345 * Check bus_irq boundary.
347 if (bus_irq >= NR_IRQS_LEGACY) {
348 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
353 * TBD: This check is for faulty timer entries, where the override
354 * erroneously sets the trigger to level, resulting in a HUGE
355 * increase of timer interrupts!
357 if ((bus_irq == 0) && (trigger == 3))
360 if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
363 * Reset default identity mapping if gsi is also an legacy IRQ,
364 * otherwise there will be more than one entry with the same GSI
365 * and acpi_isa_irq_to_gsi() may give wrong result.
367 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
368 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
369 isa_irq_to_gsi[bus_irq] = gsi;
372 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
375 #ifdef CONFIG_X86_MPPARSE
376 struct mpc_intsrc mp_irq;
377 struct pci_dev *pdev;
378 unsigned char number;
385 if (!dev || !dev_is_pci(dev))
388 pdev = to_pci_dev(dev);
389 number = pdev->bus->number;
392 /* print the entry should happen on mptable identically */
393 mp_irq.type = MP_INTSRC;
394 mp_irq.irqtype = mp_INT;
395 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
396 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
397 mp_irq.srcbus = number;
398 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
399 ioapic = mp_find_ioapic(gsi);
400 mp_irq.dstapic = mpc_ioapic_id(ioapic);
401 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
403 mp_save_irq(&mp_irq);
408 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
411 struct mpc_intsrc mp_irq;
414 /* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
415 ioapic = mp_find_ioapic(gsi);
417 pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
421 pin = mp_find_ioapic_pin(ioapic, gsi);
423 mp_irq.type = MP_INTSRC;
424 mp_irq.irqtype = mp_INT;
425 mp_irq.irqflag = (trigger << 2) | polarity;
426 mp_irq.srcbus = MP_ISA_BUS;
427 mp_irq.srcbusirq = bus_irq;
428 mp_irq.dstapic = mpc_ioapic_id(ioapic);
431 mp_save_irq(&mp_irq);
437 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
439 struct acpi_madt_io_apic *ioapic = NULL;
440 struct ioapic_domain_cfg cfg = {
441 .type = IOAPIC_DOMAIN_DYNAMIC,
442 .ops = &mp_ioapic_irqdomain_ops,
445 ioapic = (struct acpi_madt_io_apic *)header;
447 if (BAD_MADT_ENTRY(ioapic, end))
450 acpi_table_print_madt_entry(header);
452 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
453 if (ioapic->global_irq_base < nr_legacy_irqs())
454 cfg.type = IOAPIC_DOMAIN_LEGACY;
456 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
463 * Parse Interrupt Source Override for the ACPI SCI
465 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
467 if (trigger == 0) /* compatible SCI trigger is level */
470 if (polarity == 0) /* compatible SCI polarity is low */
473 /* Command-line over-ride via acpi_sci= */
474 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
475 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
477 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
478 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
480 if (bus_irq < NR_IRQS_LEGACY)
481 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
483 mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
485 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
488 * stash over-ride to indicate we've been here
489 * and for later update of acpi_gbl_FADT
491 acpi_sci_override_gsi = gsi;
496 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
497 const unsigned long end)
499 struct acpi_madt_interrupt_override *intsrc = NULL;
501 intsrc = (struct acpi_madt_interrupt_override *)header;
503 if (BAD_MADT_ENTRY(intsrc, end))
506 acpi_table_print_madt_entry(header);
508 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
509 acpi_sci_ioapic_setup(intsrc->source_irq,
510 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
511 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
516 if (intsrc->source_irq == 0) {
517 if (acpi_skip_timer_override) {
518 printk(PREFIX "BIOS IRQ0 override ignored.\n");
522 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
523 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
524 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
525 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
529 mp_override_legacy_irq(intsrc->source_irq,
530 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
531 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
538 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
540 struct acpi_madt_nmi_source *nmi_src = NULL;
542 nmi_src = (struct acpi_madt_nmi_source *)header;
544 if (BAD_MADT_ENTRY(nmi_src, end))
547 acpi_table_print_madt_entry(header);
549 /* TBD: Support nimsrc entries? */
554 #endif /* CONFIG_X86_IO_APIC */
557 * acpi_pic_sci_set_trigger()
559 * use ELCR to set PIC-mode trigger type for SCI
561 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
562 * it may require Edge Trigger -- use "acpi_sci=edge"
564 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
565 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
566 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
567 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
570 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
572 unsigned int mask = 1 << irq;
573 unsigned int old, new;
575 /* Real old ELCR mask */
576 old = inb(0x4d0) | (inb(0x4d1) << 8);
579 * If we use ACPI to set PCI IRQs, then we should clear ELCR
580 * since we will set it correctly as we enable the PCI irq
583 new = acpi_noirq ? old : 0;
586 * Update SCI information in the ELCR, it isn't in the PCI
590 case 1: /* Edge - clear */
593 case 3: /* Level - set */
601 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
603 outb(new >> 8, 0x4d1);
606 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
608 int rc, irq, trigger, polarity;
610 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
615 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
617 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
618 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
619 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
628 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
630 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
632 if (isa_irq < nr_legacy_irqs() &&
633 isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
634 *gsi = isa_irq_to_gsi[isa_irq];
641 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
642 int trigger, int polarity)
646 * Make sure all (legacy) PCI IRQs are set as level-triggered.
648 if (trigger == ACPI_LEVEL_SENSITIVE)
649 elcr_set_level_irq(gsi);
655 #ifdef CONFIG_X86_LOCAL_APIC
656 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
657 int trigger, int polarity)
660 #ifdef CONFIG_X86_IO_APIC
662 struct irq_alloc_info info;
664 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
665 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
666 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
667 ioapic_set_alloc_attr(&info, node, trigger, polarity);
669 mutex_lock(&acpi_ioapic_lock);
670 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
671 /* Don't set up the ACPI SCI because it's already set up */
672 if (irq >= 0 && enable_update_mptable &&
673 acpi_gbl_FADT.sci_interrupt != gsi)
674 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
675 mutex_unlock(&acpi_ioapic_lock);
681 static void acpi_unregister_gsi_ioapic(u32 gsi)
683 #ifdef CONFIG_X86_IO_APIC
686 mutex_lock(&acpi_ioapic_lock);
687 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
690 mutex_unlock(&acpi_ioapic_lock);
695 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
696 int trigger, int polarity) = acpi_register_gsi_pic;
697 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
699 #ifdef CONFIG_ACPI_SLEEP
700 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
702 int (*acpi_suspend_lowlevel)(void);
706 * success: return IRQ number (>=0)
707 * failure: return < 0
709 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
711 return __acpi_register_gsi(dev, gsi, trigger, polarity);
713 EXPORT_SYMBOL_GPL(acpi_register_gsi);
715 void acpi_unregister_gsi(u32 gsi)
717 if (__acpi_unregister_gsi)
718 __acpi_unregister_gsi(gsi);
720 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
722 #ifdef CONFIG_X86_LOCAL_APIC
723 static void __init acpi_set_irq_model_ioapic(void)
725 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
726 __acpi_register_gsi = acpi_register_gsi_ioapic;
727 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
733 * ACPI based hotplug support for CPU
735 #ifdef CONFIG_ACPI_HOTPLUG_CPU
736 #include <acpi/processor.h>
738 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
740 #ifdef CONFIG_ACPI_NUMA
743 nid = acpi_get_node(handle);
745 set_apicid_to_node(physid, nid);
746 numa_set_node(cpu, nid);
752 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
756 cpu = acpi_register_lapic(physid, U32_MAX, ACPI_MADT_ENABLED);
758 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
762 acpi_processor_set_pdc(handle);
763 acpi_map_cpu2node(handle, cpu, physid);
768 EXPORT_SYMBOL(acpi_map_cpu);
770 int acpi_unmap_cpu(int cpu)
772 #ifdef CONFIG_ACPI_NUMA
773 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
776 per_cpu(x86_cpu_to_apicid, cpu) = -1;
777 set_cpu_present(cpu, false);
782 EXPORT_SYMBOL(acpi_unmap_cpu);
783 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
785 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
788 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
791 struct ioapic_domain_cfg cfg = {
792 .type = IOAPIC_DOMAIN_DYNAMIC,
793 .ops = &mp_ioapic_irqdomain_ops,
796 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
798 unsigned long long uid;
801 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
803 if (ACPI_FAILURE(status)) {
804 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
807 ioapic_id = (int)uid;
810 mutex_lock(&acpi_ioapic_lock);
811 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
812 mutex_unlock(&acpi_ioapic_lock);
817 EXPORT_SYMBOL(acpi_register_ioapic);
819 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
823 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
824 mutex_lock(&acpi_ioapic_lock);
825 ret = mp_unregister_ioapic(gsi_base);
826 mutex_unlock(&acpi_ioapic_lock);
831 EXPORT_SYMBOL(acpi_unregister_ioapic);
834 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
835 * has been registered
836 * @handle: ACPI handle of the IOAPIC deivce
837 * @gsi_base: GSI base associated with the IOAPIC
839 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
840 * with acpi_register_ioapic()/acpi_unregister_ioapic().
842 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
846 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
847 mutex_lock(&acpi_ioapic_lock);
848 ret = mp_ioapic_registered(gsi_base);
849 mutex_unlock(&acpi_ioapic_lock);
855 static int __init acpi_parse_sbf(struct acpi_table_header *table)
857 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
859 sbf_port = sb->cmos_index; /* Save CMOS port */
864 #ifdef CONFIG_HPET_TIMER
865 #include <asm/hpet.h>
867 static struct resource *hpet_res __initdata;
869 static int __init acpi_parse_hpet(struct acpi_table_header *table)
871 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
873 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
874 printk(KERN_WARNING PREFIX "HPET timers must be located in "
879 hpet_address = hpet_tbl->address.address;
880 hpet_blockid = hpet_tbl->sequence;
883 * Some broken BIOSes advertise HPET at 0x0. We really do not
884 * want to allocate a resource there.
887 printk(KERN_WARNING PREFIX
888 "HPET id: %#x base: %#lx is invalid\n",
889 hpet_tbl->id, hpet_address);
894 * Some even more broken BIOSes advertise HPET at
895 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
898 if (hpet_address == 0xfed0000000000000UL) {
899 if (!hpet_force_user) {
900 printk(KERN_WARNING PREFIX "HPET id: %#x "
901 "base: 0xfed0000000000000 is bogus\n "
902 "try hpet=force on the kernel command line to "
903 "fix it up to 0xfed00000.\n", hpet_tbl->id);
907 printk(KERN_WARNING PREFIX
908 "HPET id: %#x base: 0xfed0000000000000 fixed up "
909 "to 0xfed00000.\n", hpet_tbl->id);
913 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
914 hpet_tbl->id, hpet_address);
917 * Allocate and initialize the HPET firmware resource for adding into
918 * the resource tree during the lateinit timeframe.
920 #define HPET_RESOURCE_NAME_SIZE 9
921 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
923 hpet_res->name = (void *)&hpet_res[1];
924 hpet_res->flags = IORESOURCE_MEM;
925 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
928 hpet_res->start = hpet_address;
929 hpet_res->end = hpet_address + (1 * 1024) - 1;
935 * hpet_insert_resource inserts the HPET resources used into the resource
938 static __init int hpet_insert_resource(void)
943 return insert_resource(&iomem_resource, hpet_res);
946 late_initcall(hpet_insert_resource);
949 #define acpi_parse_hpet NULL
952 static int __init acpi_parse_fadt(struct acpi_table_header *table)
954 if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
955 pr_debug("ACPI: no legacy devices present\n");
956 x86_platform.legacy.devices.pnpbios = 0;
959 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
960 pr_debug("ACPI: not registering RTC platform device\n");
961 x86_platform.legacy.rtc = 0;
964 #ifdef CONFIG_X86_PM_TIMER
965 /* detect the location of the ACPI PM Timer */
966 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
968 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
969 ACPI_ADR_SPACE_SYSTEM_IO)
972 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
974 * "X" fields are optional extensions to the original V1.0
975 * fields, so we must selectively expand V1.0 fields if the
976 * corresponding X field is zero.
979 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
982 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
985 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
991 #ifdef CONFIG_X86_LOCAL_APIC
993 * Parse LAPIC entries in MADT
994 * returns 0 on success, < 0 on error
997 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
1001 if (!boot_cpu_has(X86_FEATURE_APIC))
1005 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1006 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1009 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1010 acpi_parse_lapic_addr_ovr, 0);
1012 printk(KERN_ERR PREFIX
1013 "Error parsing LAPIC address override entry\n");
1017 register_lapic_address(acpi_lapic_addr);
1022 static int __init acpi_parse_madt_lapic_entries(void)
1027 struct acpi_subtable_proc madt_proc[2];
1029 if (!boot_cpu_has(X86_FEATURE_APIC))
1032 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1033 acpi_parse_sapic, MAX_LOCAL_APIC);
1036 memset(madt_proc, 0, sizeof(madt_proc));
1037 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1038 madt_proc[0].handler = acpi_parse_lapic;
1039 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1040 madt_proc[1].handler = acpi_parse_x2apic;
1041 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1042 sizeof(struct acpi_table_madt),
1043 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1045 printk(KERN_ERR PREFIX
1046 "Error parsing LAPIC/X2APIC entries\n");
1050 count = madt_proc[0].count;
1051 x2count = madt_proc[1].count;
1053 if (!count && !x2count) {
1054 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1055 /* TBD: Cleanup to allow fallback to MPS */
1057 } else if (count < 0 || x2count < 0) {
1058 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1059 /* TBD: Cleanup to allow fallback to MPS */
1063 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1064 acpi_parse_x2apic_nmi, 0);
1065 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1066 acpi_parse_lapic_nmi, 0);
1067 if (count < 0 || x2count < 0) {
1068 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1069 /* TBD: Cleanup to allow fallback to MPS */
1074 #endif /* CONFIG_X86_LOCAL_APIC */
1076 #ifdef CONFIG_X86_IO_APIC
1077 static void __init mp_config_acpi_legacy_irqs(void)
1080 struct mpc_intsrc mp_irq;
1084 * Fabricate the legacy ISA bus (bus #31).
1086 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1088 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1089 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1092 * Use the default configuration for the IRQs 0-15. Unless
1093 * overridden by (MADT) interrupt source override entries.
1095 for (i = 0; i < nr_legacy_irqs(); i++) {
1097 unsigned int dstapic;
1101 /* Locate the gsi that irq i maps to. */
1102 if (acpi_isa_irq_to_gsi(i, &gsi))
1106 * Locate the IOAPIC that manages the ISA IRQ.
1108 ioapic = mp_find_ioapic(gsi);
1111 pin = mp_find_ioapic_pin(ioapic, gsi);
1112 dstapic = mpc_ioapic_id(ioapic);
1114 for (idx = 0; idx < mp_irq_entries; idx++) {
1115 struct mpc_intsrc *irq = mp_irqs + idx;
1117 /* Do we already have a mapping for this ISA IRQ? */
1118 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1121 /* Do we already have a mapping for this IOAPIC pin */
1122 if (irq->dstapic == dstapic && irq->dstirq == pin)
1126 if (idx != mp_irq_entries) {
1127 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1128 continue; /* IRQ already used */
1131 mp_irq.type = MP_INTSRC;
1132 mp_irq.irqflag = 0; /* Conforming */
1133 mp_irq.srcbus = MP_ISA_BUS;
1134 mp_irq.dstapic = dstapic;
1135 mp_irq.irqtype = mp_INT;
1136 mp_irq.srcbusirq = i; /* Identity mapped */
1137 mp_irq.dstirq = pin;
1139 mp_save_irq(&mp_irq);
1144 * Parse IOAPIC related entries in MADT
1145 * returns 0 on success, < 0 on error
1147 static int __init acpi_parse_madt_ioapic_entries(void)
1152 * ACPI interpreter is required to complete interrupt setup,
1153 * so if it is off, don't enumerate the io-apics with ACPI.
1154 * If MPS is present, it will handle them,
1155 * otherwise the system will stay in PIC mode
1157 if (acpi_disabled || acpi_noirq)
1160 if (!boot_cpu_has(X86_FEATURE_APIC))
1164 * if "noapic" boot option, don't look for IO-APICs
1166 if (skip_ioapic_setup) {
1167 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1168 "due to 'noapic' option.\n");
1172 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1175 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1177 } else if (count < 0) {
1178 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1182 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1183 acpi_parse_int_src_ovr, nr_irqs);
1185 printk(KERN_ERR PREFIX
1186 "Error parsing interrupt source overrides entry\n");
1187 /* TBD: Cleanup to allow fallback to MPS */
1192 * If BIOS did not supply an INT_SRC_OVR for the SCI
1193 * pretend we got one so we can set the SCI flags.
1195 if (!acpi_sci_override_gsi)
1196 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1197 acpi_gbl_FADT.sci_interrupt);
1199 /* Fill in identity legacy mappings where no override */
1200 mp_config_acpi_legacy_irqs();
1202 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1203 acpi_parse_nmi_src, nr_irqs);
1205 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1206 /* TBD: Cleanup to allow fallback to MPS */
1213 static inline int acpi_parse_madt_ioapic_entries(void)
1217 #endif /* !CONFIG_X86_IO_APIC */
1219 static void __init early_acpi_process_madt(void)
1221 #ifdef CONFIG_X86_LOCAL_APIC
1224 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1227 * Parse MADT LAPIC entries
1229 error = early_acpi_parse_madt_lapic_addr_ovr();
1232 smp_found_config = 1;
1234 if (error == -EINVAL) {
1236 * Dell Precision Workstation 410, 610 come here.
1238 printk(KERN_ERR PREFIX
1239 "Invalid BIOS MADT, disabling ACPI\n");
1246 static void __init acpi_process_madt(void)
1248 #ifdef CONFIG_X86_LOCAL_APIC
1251 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1254 * Parse MADT LAPIC entries
1256 error = acpi_parse_madt_lapic_entries();
1261 * Parse MADT IO-APIC entries
1263 mutex_lock(&acpi_ioapic_lock);
1264 error = acpi_parse_madt_ioapic_entries();
1265 mutex_unlock(&acpi_ioapic_lock);
1267 acpi_set_irq_model_ioapic();
1269 smp_found_config = 1;
1272 if (error == -EINVAL) {
1274 * Dell Precision Workstation 410, 610 come here.
1276 printk(KERN_ERR PREFIX
1277 "Invalid BIOS MADT, disabling ACPI\n");
1282 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1283 * In the event an MPS table was found, forget it.
1284 * Boot with "acpi=off" to use MPS on such a system.
1286 if (smp_found_config) {
1287 printk(KERN_WARNING PREFIX
1288 "No APIC-table, disabling MPS\n");
1289 smp_found_config = 0;
1294 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1295 * processors, where MPS only supports physical.
1297 if (acpi_lapic && acpi_ioapic)
1298 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1300 else if (acpi_lapic)
1301 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1302 "configuration information\n");
1307 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1310 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1317 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1320 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1327 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1330 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1334 "Warning: DMI blacklist says broken, but acpi forced\n");
1340 * Force ignoring BIOS IRQ0 override
1342 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1344 if (!acpi_skip_timer_override) {
1345 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1347 acpi_skip_timer_override = 1;
1353 * ACPI offers an alternative platform interface model that removes
1354 * ACPI hardware requirements for platforms that do not implement
1355 * the PC Architecture.
1357 * We initialize the Hardware-reduced ACPI model here:
1359 static void __init acpi_reduced_hw_init(void)
1361 if (acpi_gbl_reduced_hardware) {
1363 * Override x86_init functions and bypass legacy pic
1364 * in Hardware-reduced ACPI mode
1366 x86_init.timers.timer_init = x86_init_noop;
1367 x86_init.irqs.pre_vector_init = x86_init_noop;
1368 legacy_pic = &null_legacy_pic;
1373 * If your system is blacklisted here, but you find that acpi=force
1374 * works for you, please contact linux-acpi@vger.kernel.org
1376 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1378 * Boxes that need ACPI disabled
1381 .callback = dmi_disable_acpi,
1382 .ident = "IBM Thinkpad",
1384 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1385 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1390 * Boxes that need ACPI PCI IRQ routing disabled
1393 .callback = disable_acpi_irq,
1394 .ident = "ASUS A7V",
1396 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1397 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1398 /* newer BIOS, Revision 1011, does work */
1399 DMI_MATCH(DMI_BIOS_VERSION,
1400 "ASUS A7V ACPI BIOS Revision 1007"),
1405 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1406 * for LPC bridge, which is needed for the PCI
1407 * interrupt links to work. DSDT fix is in bug 5966.
1408 * 2645, 2646 model numbers are shared with 600/600E/600X
1410 .callback = disable_acpi_irq,
1411 .ident = "IBM Thinkpad 600 Series 2645",
1413 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1414 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1418 .callback = disable_acpi_irq,
1419 .ident = "IBM Thinkpad 600 Series 2646",
1421 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1422 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1426 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1429 .callback = disable_acpi_pci,
1430 .ident = "ASUS PR-DLS",
1432 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1433 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1434 DMI_MATCH(DMI_BIOS_VERSION,
1435 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1436 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1440 .callback = disable_acpi_pci,
1441 .ident = "Acer TravelMate 36x Laptop",
1443 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1444 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1450 /* second table for DMI checks that should run after early-quirks */
1451 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1453 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1454 * which includes some code which overrides all temperature
1455 * trip points to 16C if the INTIN2 input of the I/O APIC
1456 * is enabled. This input is incorrectly designated the
1457 * ISA IRQ 0 via an interrupt source override even though
1458 * it is wired to the output of the master 8259A and INTIN0
1459 * is not connected at all. Force ignoring BIOS IRQ0
1460 * override in that cases.
1463 .callback = dmi_ignore_irq0_timer_override,
1464 .ident = "HP nx6115 laptop",
1466 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1467 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1471 .callback = dmi_ignore_irq0_timer_override,
1472 .ident = "HP NX6125 laptop",
1474 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1475 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1479 .callback = dmi_ignore_irq0_timer_override,
1480 .ident = "HP NX6325 laptop",
1482 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1483 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1487 .callback = dmi_ignore_irq0_timer_override,
1488 .ident = "HP 6715b laptop",
1490 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1491 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1495 .callback = dmi_ignore_irq0_timer_override,
1496 .ident = "FUJITSU SIEMENS",
1498 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1499 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1506 * acpi_boot_table_init() and acpi_boot_init()
1507 * called from setup_arch(), always.
1508 * 1. checksums all tables
1509 * 2. enumerates lapics
1510 * 3. enumerates io-apics
1512 * acpi_table_init() is separate to allow reading SRAT without
1513 * other side effects.
1515 * side effects of acpi_boot_init:
1516 * acpi_lapic = 1 if LAPIC found
1517 * acpi_ioapic = 1 if IOAPIC found
1518 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1519 * if acpi_blacklisted() acpi_disabled = 1;
1520 * acpi_irq_model=...
1524 void __init acpi_boot_table_init(void)
1526 dmi_check_system(acpi_dmi_table);
1529 * If acpi_disabled, bail out
1535 * Initialize the ACPI boot-time table parser.
1537 if (acpi_table_init()) {
1542 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1545 * blacklist may disable ACPI entirely
1547 if (acpi_blacklisted()) {
1549 printk(KERN_WARNING PREFIX "acpi=force override\n");
1551 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1558 int __init early_acpi_boot_init(void)
1561 * If acpi_disabled, bail out
1567 * Process the Multiple APIC Description Table (MADT), if present
1569 early_acpi_process_madt();
1572 * Hardware-reduced ACPI mode initialization:
1574 acpi_reduced_hw_init();
1579 int __init acpi_boot_init(void)
1581 /* those are executed after early-quirks are executed */
1582 dmi_check_system(acpi_dmi_table_late);
1585 * If acpi_disabled, bail out
1590 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1593 * set sci_int and PM timer address
1595 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1598 * Process the Multiple APIC Description Table (MADT), if present
1600 acpi_process_madt();
1602 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1605 x86_init.pci.init = pci_acpi_init;
1610 static int __init parse_acpi(char *arg)
1615 /* "acpi=off" disables both ACPI table parsing and interpreter */
1616 if (strcmp(arg, "off") == 0) {
1619 /* acpi=force to over-ride black-list */
1620 else if (strcmp(arg, "force") == 0) {
1624 /* acpi=strict disables out-of-spec workarounds */
1625 else if (strcmp(arg, "strict") == 0) {
1628 /* acpi=rsdt use RSDT instead of XSDT */
1629 else if (strcmp(arg, "rsdt") == 0) {
1630 acpi_gbl_do_not_use_xsdt = TRUE;
1632 /* "acpi=noirq" disables ACPI interrupt routing */
1633 else if (strcmp(arg, "noirq") == 0) {
1636 /* "acpi=copy_dsdt" copys DSDT */
1637 else if (strcmp(arg, "copy_dsdt") == 0) {
1638 acpi_gbl_copy_dsdt_locally = 1;
1640 /* "acpi=nocmcff" disables FF mode for corrected errors */
1641 else if (strcmp(arg, "nocmcff") == 0) {
1642 acpi_disable_cmcff = 1;
1644 /* Core will printk when we return error. */
1649 early_param("acpi", parse_acpi);
1651 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1652 static int __init parse_pci(char *arg)
1654 if (arg && strcmp(arg, "noacpi") == 0)
1658 early_param("pci", parse_pci);
1660 int __init acpi_mps_check(void)
1662 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1663 /* mptable code is not built-in*/
1664 if (acpi_disabled || acpi_noirq) {
1665 printk(KERN_WARNING "MPS support code is not built-in.\n"
1666 "Using acpi=off or acpi=noirq or pci=noacpi "
1667 "may have problem\n");
1674 #ifdef CONFIG_X86_IO_APIC
1675 static int __init parse_acpi_skip_timer_override(char *arg)
1677 acpi_skip_timer_override = 1;
1680 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1682 static int __init parse_acpi_use_timer_override(char *arg)
1684 acpi_use_timer_override = 1;
1687 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1688 #endif /* CONFIG_X86_IO_APIC */
1690 static int __init setup_acpi_sci(char *s)
1694 if (!strcmp(s, "edge"))
1695 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1696 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1697 else if (!strcmp(s, "level"))
1698 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1699 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1700 else if (!strcmp(s, "high"))
1701 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1702 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1703 else if (!strcmp(s, "low"))
1704 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1705 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1710 early_param("acpi_sci", setup_acpi_sci);
1712 int __acpi_acquire_global_lock(unsigned int *lock)
1714 unsigned int old, new, val;
1717 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1718 val = cmpxchg(lock, old, new);
1719 } while (unlikely (val != old));
1720 return ((new & 0x3) < 3) ? -1 : 0;
1723 int __acpi_release_global_lock(unsigned int *lock)
1725 unsigned int old, new, val;
1729 val = cmpxchg(lock, old, new);
1730 } while (unlikely (val != old));
1734 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1736 e820_add_region(addr, size, E820_ACPI);