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 #ifdef CONFIG_X86_IO_APIC
91 static DEFINE_MUTEX(acpi_ioapic_lock);
94 /* --------------------------------------------------------------------------
95 Boot-time Configuration
96 -------------------------------------------------------------------------- */
99 * The default interrupt routing model is PIC (8259). This gets
100 * overridden if IOAPICs are enumerated (below).
102 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
106 * ISA irqs by default are the first 16 gsis but can be
107 * any gsi as specified by an interrupt source override.
109 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
110 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
113 #define ACPI_INVALID_GSI INT_MIN
116 * This is just a simple wrapper around early_ioremap(),
117 * with sanity checks for phys == 0 and size == 0.
119 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
125 return early_ioremap(phys, size);
128 void __init __acpi_unmap_table(char *map, unsigned long size)
133 early_iounmap(map, size);
136 #ifdef CONFIG_X86_LOCAL_APIC
137 static int __init acpi_parse_madt(struct acpi_table_header *table)
139 struct acpi_table_madt *madt = NULL;
144 madt = (struct acpi_table_madt *)table;
146 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
151 acpi_lapic_addr = (u64) madt->address;
153 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
157 default_acpi_madt_oem_check(madt->header.oem_id,
158 madt->header.oem_table_id);
164 * acpi_register_lapic - register a local apic and generates a logic cpu number
165 * @id: local apic id to register
166 * @enabled: this cpu is enabled or not
168 * Returns the logic cpu number which maps to the local apic
170 static int acpi_register_lapic(int id, u8 enabled)
172 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 = apic_version[boot_cpu_physical_apicid];
187 return generic_processor_info(id, ver);
191 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
193 struct acpi_madt_local_x2apic *processor = NULL;
197 processor = (struct acpi_madt_local_x2apic *)header;
199 if (BAD_MADT_ENTRY(processor, end))
202 acpi_table_print_madt_entry(header);
204 apic_id = processor->local_apic_id;
205 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
206 #ifdef CONFIG_X86_X2APIC
208 * We need to register disabled CPU as well to permit
209 * counting disabled CPUs. This allows us to size
210 * cpus_possible_map more accurately, to permit
211 * to not preallocating memory for all NR_CPUS
212 * when we use CPU hotplug.
214 if (!apic->apic_id_valid(apic_id) && enabled)
215 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
217 acpi_register_lapic(apic_id, enabled);
219 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
226 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
228 struct acpi_madt_local_apic *processor = NULL;
230 processor = (struct acpi_madt_local_apic *)header;
232 if (BAD_MADT_ENTRY(processor, end))
235 acpi_table_print_madt_entry(header);
238 * We need to register disabled CPU as well to permit
239 * counting disabled CPUs. This allows us to size
240 * cpus_possible_map more accurately, to permit
241 * to not preallocating memory for all NR_CPUS
242 * when we use CPU hotplug.
244 acpi_register_lapic(processor->id, /* APIC ID */
245 processor->lapic_flags & ACPI_MADT_ENABLED);
251 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
253 struct acpi_madt_local_sapic *processor = NULL;
255 processor = (struct acpi_madt_local_sapic *)header;
257 if (BAD_MADT_ENTRY(processor, end))
260 acpi_table_print_madt_entry(header);
262 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
263 processor->lapic_flags & ACPI_MADT_ENABLED);
269 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
270 const unsigned long end)
272 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
274 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
276 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
279 acpi_lapic_addr = lapic_addr_ovr->address;
285 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
286 const unsigned long end)
288 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
290 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
292 if (BAD_MADT_ENTRY(x2apic_nmi, end))
295 acpi_table_print_madt_entry(header);
297 if (x2apic_nmi->lint != 1)
298 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
304 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
306 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
308 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
310 if (BAD_MADT_ENTRY(lapic_nmi, end))
313 acpi_table_print_madt_entry(header);
315 if (lapic_nmi->lint != 1)
316 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
321 #endif /*CONFIG_X86_LOCAL_APIC */
323 #ifdef CONFIG_X86_IO_APIC
326 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
331 struct mpc_intsrc mp_irq;
334 * Convert 'gsi' to 'ioapic.pin'.
336 ioapic = mp_find_ioapic(gsi);
339 pin = mp_find_ioapic_pin(ioapic, gsi);
342 * TBD: This check is for faulty timer entries, where the override
343 * erroneously sets the trigger to level, resulting in a HUGE
344 * increase of timer interrupts!
346 if ((bus_irq == 0) && (trigger == 3))
349 mp_irq.type = MP_INTSRC;
350 mp_irq.irqtype = mp_INT;
351 mp_irq.irqflag = (trigger << 2) | polarity;
352 mp_irq.srcbus = MP_ISA_BUS;
353 mp_irq.srcbusirq = bus_irq; /* IRQ */
354 mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
355 mp_irq.dstirq = pin; /* INTIN# */
357 mp_save_irq(&mp_irq);
360 * Reset default identity mapping if gsi is also an legacy IRQ,
361 * otherwise there will be more than one entry with the same GSI
362 * and acpi_isa_irq_to_gsi() may give wrong result.
364 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
365 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
366 isa_irq_to_gsi[bus_irq] = gsi;
369 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
372 #ifdef CONFIG_X86_MPPARSE
373 struct mpc_intsrc mp_irq;
374 struct pci_dev *pdev;
375 unsigned char number;
382 if (!dev || !dev_is_pci(dev))
385 pdev = to_pci_dev(dev);
386 number = pdev->bus->number;
389 /* print the entry should happen on mptable identically */
390 mp_irq.type = MP_INTSRC;
391 mp_irq.irqtype = mp_INT;
392 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
393 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
394 mp_irq.srcbus = number;
395 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
396 ioapic = mp_find_ioapic(gsi);
397 mp_irq.dstapic = mpc_ioapic_id(ioapic);
398 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
400 mp_save_irq(&mp_irq);
406 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
408 struct acpi_madt_io_apic *ioapic = NULL;
409 struct ioapic_domain_cfg cfg = {
410 .type = IOAPIC_DOMAIN_DYNAMIC,
411 .ops = &mp_ioapic_irqdomain_ops,
414 ioapic = (struct acpi_madt_io_apic *)header;
416 if (BAD_MADT_ENTRY(ioapic, end))
419 acpi_table_print_madt_entry(header);
421 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
422 if (ioapic->global_irq_base < nr_legacy_irqs())
423 cfg.type = IOAPIC_DOMAIN_LEGACY;
425 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
432 * Parse Interrupt Source Override for the ACPI SCI
434 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
436 if (trigger == 0) /* compatible SCI trigger is level */
439 if (polarity == 0) /* compatible SCI polarity is low */
442 /* Command-line over-ride via acpi_sci= */
443 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
444 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
446 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
447 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
449 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
450 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
453 * stash over-ride to indicate we've been here
454 * and for later update of acpi_gbl_FADT
456 acpi_sci_override_gsi = gsi;
461 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
462 const unsigned long end)
464 struct acpi_madt_interrupt_override *intsrc = NULL;
466 intsrc = (struct acpi_madt_interrupt_override *)header;
468 if (BAD_MADT_ENTRY(intsrc, end))
471 acpi_table_print_madt_entry(header);
473 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
474 acpi_sci_ioapic_setup(intsrc->source_irq,
475 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
476 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
481 if (intsrc->source_irq == 0) {
482 if (acpi_skip_timer_override) {
483 printk(PREFIX "BIOS IRQ0 override ignored.\n");
487 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
488 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
489 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
490 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
494 mp_override_legacy_irq(intsrc->source_irq,
495 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
496 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
503 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
505 struct acpi_madt_nmi_source *nmi_src = NULL;
507 nmi_src = (struct acpi_madt_nmi_source *)header;
509 if (BAD_MADT_ENTRY(nmi_src, end))
512 acpi_table_print_madt_entry(header);
514 /* TBD: Support nimsrc entries? */
519 #endif /* CONFIG_X86_IO_APIC */
522 * acpi_pic_sci_set_trigger()
524 * use ELCR to set PIC-mode trigger type for SCI
526 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
527 * it may require Edge Trigger -- use "acpi_sci=edge"
529 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
530 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
531 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
532 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
535 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
537 unsigned int mask = 1 << irq;
538 unsigned int old, new;
540 /* Real old ELCR mask */
541 old = inb(0x4d0) | (inb(0x4d1) << 8);
544 * If we use ACPI to set PCI IRQs, then we should clear ELCR
545 * since we will set it correctly as we enable the PCI irq
548 new = acpi_noirq ? old : 0;
551 * Update SCI information in the ELCR, it isn't in the PCI
555 case 1: /* Edge - clear */
558 case 3: /* Level - set */
566 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
568 outb(new >> 8, 0x4d1);
571 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
573 int rc, irq, trigger, polarity;
575 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
580 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
582 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
583 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
584 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
593 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
595 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
597 if (isa_irq < nr_legacy_irqs() &&
598 isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
599 *gsi = isa_irq_to_gsi[isa_irq];
606 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
607 int trigger, int polarity)
611 * Make sure all (legacy) PCI IRQs are set as level-triggered.
613 if (trigger == ACPI_LEVEL_SENSITIVE)
614 elcr_set_level_irq(gsi);
620 #ifdef CONFIG_X86_LOCAL_APIC
621 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
622 int trigger, int polarity)
625 #ifdef CONFIG_X86_IO_APIC
627 struct irq_alloc_info info;
629 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
630 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
631 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
632 ioapic_set_alloc_attr(&info, node, trigger, polarity);
634 mutex_lock(&acpi_ioapic_lock);
635 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
636 /* Don't set up the ACPI SCI because it's already set up */
637 if (irq >= 0 && enable_update_mptable &&
638 acpi_gbl_FADT.sci_interrupt != gsi)
639 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
640 mutex_unlock(&acpi_ioapic_lock);
646 static void acpi_unregister_gsi_ioapic(u32 gsi)
648 #ifdef CONFIG_X86_IO_APIC
651 mutex_lock(&acpi_ioapic_lock);
652 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
655 mutex_unlock(&acpi_ioapic_lock);
660 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
661 int trigger, int polarity) = acpi_register_gsi_pic;
662 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
664 #ifdef CONFIG_ACPI_SLEEP
665 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
667 int (*acpi_suspend_lowlevel)(void);
671 * success: return IRQ number (>=0)
672 * failure: return < 0
674 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
676 return __acpi_register_gsi(dev, gsi, trigger, polarity);
678 EXPORT_SYMBOL_GPL(acpi_register_gsi);
680 void acpi_unregister_gsi(u32 gsi)
682 if (__acpi_unregister_gsi)
683 __acpi_unregister_gsi(gsi);
685 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
687 #ifdef CONFIG_X86_LOCAL_APIC
688 static void __init acpi_set_irq_model_ioapic(void)
690 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
691 __acpi_register_gsi = acpi_register_gsi_ioapic;
692 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
698 * ACPI based hotplug support for CPU
700 #ifdef CONFIG_ACPI_HOTPLUG_CPU
701 #include <acpi/processor.h>
703 static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
705 #ifdef CONFIG_ACPI_NUMA
708 nid = acpi_get_node(handle);
710 set_apicid_to_node(physid, nid);
711 numa_set_node(cpu, nid);
716 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
720 cpu = acpi_register_lapic(physid, ACPI_MADT_ENABLED);
722 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
726 acpi_processor_set_pdc(handle);
727 acpi_map_cpu2node(handle, cpu, physid);
732 EXPORT_SYMBOL(acpi_map_cpu);
734 int acpi_unmap_cpu(int cpu)
736 #ifdef CONFIG_ACPI_NUMA
737 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
740 per_cpu(x86_cpu_to_apicid, cpu) = -1;
741 set_cpu_present(cpu, false);
746 EXPORT_SYMBOL(acpi_unmap_cpu);
747 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
749 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
752 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
755 struct ioapic_domain_cfg cfg = {
756 .type = IOAPIC_DOMAIN_DYNAMIC,
757 .ops = &mp_ioapic_irqdomain_ops,
760 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
762 unsigned long long uid;
765 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
767 if (ACPI_FAILURE(status)) {
768 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
771 ioapic_id = (int)uid;
774 mutex_lock(&acpi_ioapic_lock);
775 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
776 mutex_unlock(&acpi_ioapic_lock);
781 EXPORT_SYMBOL(acpi_register_ioapic);
783 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
787 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
788 mutex_lock(&acpi_ioapic_lock);
789 ret = mp_unregister_ioapic(gsi_base);
790 mutex_unlock(&acpi_ioapic_lock);
795 EXPORT_SYMBOL(acpi_unregister_ioapic);
798 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
799 * has been registered
800 * @handle: ACPI handle of the IOAPIC deivce
801 * @gsi_base: GSI base associated with the IOAPIC
803 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
804 * with acpi_register_ioapic()/acpi_unregister_ioapic().
806 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
810 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
811 mutex_lock(&acpi_ioapic_lock);
812 ret = mp_ioapic_registered(gsi_base);
813 mutex_unlock(&acpi_ioapic_lock);
819 static int __init acpi_parse_sbf(struct acpi_table_header *table)
821 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
823 sbf_port = sb->cmos_index; /* Save CMOS port */
828 #ifdef CONFIG_HPET_TIMER
829 #include <asm/hpet.h>
831 static struct resource *hpet_res __initdata;
833 static int __init acpi_parse_hpet(struct acpi_table_header *table)
835 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
837 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
838 printk(KERN_WARNING PREFIX "HPET timers must be located in "
843 hpet_address = hpet_tbl->address.address;
844 hpet_blockid = hpet_tbl->sequence;
847 * Some broken BIOSes advertise HPET at 0x0. We really do not
848 * want to allocate a resource there.
851 printk(KERN_WARNING PREFIX
852 "HPET id: %#x base: %#lx is invalid\n",
853 hpet_tbl->id, hpet_address);
858 * Some even more broken BIOSes advertise HPET at
859 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
862 if (hpet_address == 0xfed0000000000000UL) {
863 if (!hpet_force_user) {
864 printk(KERN_WARNING PREFIX "HPET id: %#x "
865 "base: 0xfed0000000000000 is bogus\n "
866 "try hpet=force on the kernel command line to "
867 "fix it up to 0xfed00000.\n", hpet_tbl->id);
871 printk(KERN_WARNING PREFIX
872 "HPET id: %#x base: 0xfed0000000000000 fixed up "
873 "to 0xfed00000.\n", hpet_tbl->id);
877 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
878 hpet_tbl->id, hpet_address);
881 * Allocate and initialize the HPET firmware resource for adding into
882 * the resource tree during the lateinit timeframe.
884 #define HPET_RESOURCE_NAME_SIZE 9
885 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
887 hpet_res->name = (void *)&hpet_res[1];
888 hpet_res->flags = IORESOURCE_MEM;
889 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
892 hpet_res->start = hpet_address;
893 hpet_res->end = hpet_address + (1 * 1024) - 1;
899 * hpet_insert_resource inserts the HPET resources used into the resource
902 static __init int hpet_insert_resource(void)
907 return insert_resource(&iomem_resource, hpet_res);
910 late_initcall(hpet_insert_resource);
913 #define acpi_parse_hpet NULL
916 static int __init acpi_parse_fadt(struct acpi_table_header *table)
919 #ifdef CONFIG_X86_PM_TIMER
920 /* detect the location of the ACPI PM Timer */
921 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
923 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
924 ACPI_ADR_SPACE_SYSTEM_IO)
927 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
929 * "X" fields are optional extensions to the original V1.0
930 * fields, so we must selectively expand V1.0 fields if the
931 * corresponding X field is zero.
934 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
937 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
940 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
946 #ifdef CONFIG_X86_LOCAL_APIC
948 * Parse LAPIC entries in MADT
949 * returns 0 on success, < 0 on error
952 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
960 * Note that the LAPIC address is obtained from the MADT (32-bit value)
961 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
964 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
965 acpi_parse_lapic_addr_ovr, 0);
967 printk(KERN_ERR PREFIX
968 "Error parsing LAPIC address override entry\n");
972 register_lapic_address(acpi_lapic_addr);
977 static int __init acpi_parse_madt_lapic_entries(void)
982 struct acpi_subtable_proc madt_proc[2];
988 * Note that the LAPIC address is obtained from the MADT (32-bit value)
989 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
992 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
993 acpi_parse_lapic_addr_ovr, 0);
995 printk(KERN_ERR PREFIX
996 "Error parsing LAPIC address override entry\n");
1000 register_lapic_address(acpi_lapic_addr);
1002 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1003 acpi_parse_sapic, MAX_LOCAL_APIC);
1006 memset(madt_proc, 0, sizeof(madt_proc));
1007 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1008 madt_proc[0].handler = acpi_parse_lapic;
1009 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1010 madt_proc[1].handler = acpi_parse_x2apic;
1011 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1012 sizeof(struct acpi_table_madt),
1013 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1015 printk(KERN_ERR PREFIX
1016 "Error parsing LAPIC/X2APIC entries\n");
1020 x2count = madt_proc[0].count;
1021 count = madt_proc[1].count;
1023 if (!count && !x2count) {
1024 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1025 /* TBD: Cleanup to allow fallback to MPS */
1027 } else if (count < 0 || x2count < 0) {
1028 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1029 /* TBD: Cleanup to allow fallback to MPS */
1033 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1034 acpi_parse_x2apic_nmi, 0);
1035 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1036 acpi_parse_lapic_nmi, 0);
1037 if (count < 0 || x2count < 0) {
1038 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1039 /* TBD: Cleanup to allow fallback to MPS */
1044 #endif /* CONFIG_X86_LOCAL_APIC */
1046 #ifdef CONFIG_X86_IO_APIC
1047 static void __init mp_config_acpi_legacy_irqs(void)
1050 struct mpc_intsrc mp_irq;
1054 * Fabricate the legacy ISA bus (bus #31).
1056 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1058 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1059 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1062 * Use the default configuration for the IRQs 0-15. Unless
1063 * overridden by (MADT) interrupt source override entries.
1065 for (i = 0; i < nr_legacy_irqs(); i++) {
1067 unsigned int dstapic;
1071 /* Locate the gsi that irq i maps to. */
1072 if (acpi_isa_irq_to_gsi(i, &gsi))
1076 * Locate the IOAPIC that manages the ISA IRQ.
1078 ioapic = mp_find_ioapic(gsi);
1081 pin = mp_find_ioapic_pin(ioapic, gsi);
1082 dstapic = mpc_ioapic_id(ioapic);
1084 for (idx = 0; idx < mp_irq_entries; idx++) {
1085 struct mpc_intsrc *irq = mp_irqs + idx;
1087 /* Do we already have a mapping for this ISA IRQ? */
1088 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1091 /* Do we already have a mapping for this IOAPIC pin */
1092 if (irq->dstapic == dstapic && irq->dstirq == pin)
1096 if (idx != mp_irq_entries) {
1097 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1098 continue; /* IRQ already used */
1101 mp_irq.type = MP_INTSRC;
1102 mp_irq.irqflag = 0; /* Conforming */
1103 mp_irq.srcbus = MP_ISA_BUS;
1104 mp_irq.dstapic = dstapic;
1105 mp_irq.irqtype = mp_INT;
1106 mp_irq.srcbusirq = i; /* Identity mapped */
1107 mp_irq.dstirq = pin;
1109 mp_save_irq(&mp_irq);
1114 * Parse IOAPIC related entries in MADT
1115 * returns 0 on success, < 0 on error
1117 static int __init acpi_parse_madt_ioapic_entries(void)
1122 * ACPI interpreter is required to complete interrupt setup,
1123 * so if it is off, don't enumerate the io-apics with ACPI.
1124 * If MPS is present, it will handle them,
1125 * otherwise the system will stay in PIC mode
1127 if (acpi_disabled || acpi_noirq)
1134 * if "noapic" boot option, don't look for IO-APICs
1136 if (skip_ioapic_setup) {
1137 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1138 "due to 'noapic' option.\n");
1142 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1145 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1147 } else if (count < 0) {
1148 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1152 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1153 acpi_parse_int_src_ovr, nr_irqs);
1155 printk(KERN_ERR PREFIX
1156 "Error parsing interrupt source overrides entry\n");
1157 /* TBD: Cleanup to allow fallback to MPS */
1162 * If BIOS did not supply an INT_SRC_OVR for the SCI
1163 * pretend we got one so we can set the SCI flags.
1165 if (!acpi_sci_override_gsi)
1166 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1167 acpi_gbl_FADT.sci_interrupt);
1169 /* Fill in identity legacy mappings where no override */
1170 mp_config_acpi_legacy_irqs();
1172 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1173 acpi_parse_nmi_src, nr_irqs);
1175 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1176 /* TBD: Cleanup to allow fallback to MPS */
1183 static inline int acpi_parse_madt_ioapic_entries(void)
1187 #endif /* !CONFIG_X86_IO_APIC */
1189 static void __init early_acpi_process_madt(void)
1191 #ifdef CONFIG_X86_LOCAL_APIC
1194 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1197 * Parse MADT LAPIC entries
1199 error = early_acpi_parse_madt_lapic_addr_ovr();
1202 smp_found_config = 1;
1204 if (error == -EINVAL) {
1206 * Dell Precision Workstation 410, 610 come here.
1208 printk(KERN_ERR PREFIX
1209 "Invalid BIOS MADT, disabling ACPI\n");
1216 static void __init acpi_process_madt(void)
1218 #ifdef CONFIG_X86_LOCAL_APIC
1221 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1224 * Parse MADT LAPIC entries
1226 error = acpi_parse_madt_lapic_entries();
1231 * Parse MADT IO-APIC entries
1233 mutex_lock(&acpi_ioapic_lock);
1234 error = acpi_parse_madt_ioapic_entries();
1235 mutex_unlock(&acpi_ioapic_lock);
1237 acpi_set_irq_model_ioapic();
1239 smp_found_config = 1;
1242 if (error == -EINVAL) {
1244 * Dell Precision Workstation 410, 610 come here.
1246 printk(KERN_ERR PREFIX
1247 "Invalid BIOS MADT, disabling ACPI\n");
1252 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1253 * In the event an MPS table was found, forget it.
1254 * Boot with "acpi=off" to use MPS on such a system.
1256 if (smp_found_config) {
1257 printk(KERN_WARNING PREFIX
1258 "No APIC-table, disabling MPS\n");
1259 smp_found_config = 0;
1264 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1265 * processors, where MPS only supports physical.
1267 if (acpi_lapic && acpi_ioapic)
1268 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1270 else if (acpi_lapic)
1271 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1272 "configuration information\n");
1277 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1280 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1287 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1290 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1297 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1300 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1304 "Warning: DMI blacklist says broken, but acpi forced\n");
1310 * Force ignoring BIOS IRQ0 override
1312 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1314 if (!acpi_skip_timer_override) {
1315 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1317 acpi_skip_timer_override = 1;
1323 * ACPI offers an alternative platform interface model that removes
1324 * ACPI hardware requirements for platforms that do not implement
1325 * the PC Architecture.
1327 * We initialize the Hardware-reduced ACPI model here:
1329 static void __init acpi_reduced_hw_init(void)
1331 if (acpi_gbl_reduced_hardware) {
1333 * Override x86_init functions and bypass legacy pic
1334 * in Hardware-reduced ACPI mode
1336 x86_init.timers.timer_init = x86_init_noop;
1337 x86_init.irqs.pre_vector_init = x86_init_noop;
1338 legacy_pic = &null_legacy_pic;
1343 * If your system is blacklisted here, but you find that acpi=force
1344 * works for you, please contact linux-acpi@vger.kernel.org
1346 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1348 * Boxes that need ACPI disabled
1351 .callback = dmi_disable_acpi,
1352 .ident = "IBM Thinkpad",
1354 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1355 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1360 * Boxes that need ACPI PCI IRQ routing disabled
1363 .callback = disable_acpi_irq,
1364 .ident = "ASUS A7V",
1366 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1367 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1368 /* newer BIOS, Revision 1011, does work */
1369 DMI_MATCH(DMI_BIOS_VERSION,
1370 "ASUS A7V ACPI BIOS Revision 1007"),
1375 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1376 * for LPC bridge, which is needed for the PCI
1377 * interrupt links to work. DSDT fix is in bug 5966.
1378 * 2645, 2646 model numbers are shared with 600/600E/600X
1380 .callback = disable_acpi_irq,
1381 .ident = "IBM Thinkpad 600 Series 2645",
1383 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1384 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1388 .callback = disable_acpi_irq,
1389 .ident = "IBM Thinkpad 600 Series 2646",
1391 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1392 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1396 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1399 .callback = disable_acpi_pci,
1400 .ident = "ASUS PR-DLS",
1402 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1403 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1404 DMI_MATCH(DMI_BIOS_VERSION,
1405 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1406 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1410 .callback = disable_acpi_pci,
1411 .ident = "Acer TravelMate 36x Laptop",
1413 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1414 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1420 /* second table for DMI checks that should run after early-quirks */
1421 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1423 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1424 * which includes some code which overrides all temperature
1425 * trip points to 16C if the INTIN2 input of the I/O APIC
1426 * is enabled. This input is incorrectly designated the
1427 * ISA IRQ 0 via an interrupt source override even though
1428 * it is wired to the output of the master 8259A and INTIN0
1429 * is not connected at all. Force ignoring BIOS IRQ0
1430 * override in that cases.
1433 .callback = dmi_ignore_irq0_timer_override,
1434 .ident = "HP nx6115 laptop",
1436 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1437 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1441 .callback = dmi_ignore_irq0_timer_override,
1442 .ident = "HP NX6125 laptop",
1444 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1445 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1449 .callback = dmi_ignore_irq0_timer_override,
1450 .ident = "HP NX6325 laptop",
1452 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1453 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1457 .callback = dmi_ignore_irq0_timer_override,
1458 .ident = "HP 6715b laptop",
1460 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1461 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1465 .callback = dmi_ignore_irq0_timer_override,
1466 .ident = "FUJITSU SIEMENS",
1468 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1469 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1476 * acpi_boot_table_init() and acpi_boot_init()
1477 * called from setup_arch(), always.
1478 * 1. checksums all tables
1479 * 2. enumerates lapics
1480 * 3. enumerates io-apics
1482 * acpi_table_init() is separate to allow reading SRAT without
1483 * other side effects.
1485 * side effects of acpi_boot_init:
1486 * acpi_lapic = 1 if LAPIC found
1487 * acpi_ioapic = 1 if IOAPIC found
1488 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1489 * if acpi_blacklisted() acpi_disabled = 1;
1490 * acpi_irq_model=...
1494 void __init acpi_boot_table_init(void)
1496 dmi_check_system(acpi_dmi_table);
1499 * If acpi_disabled, bail out
1505 * Initialize the ACPI boot-time table parser.
1507 if (acpi_table_init()) {
1512 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1515 * blacklist may disable ACPI entirely
1517 if (acpi_blacklisted()) {
1519 printk(KERN_WARNING PREFIX "acpi=force override\n");
1521 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1528 int __init early_acpi_boot_init(void)
1531 * If acpi_disabled, bail out
1537 * Process the Multiple APIC Description Table (MADT), if present
1539 early_acpi_process_madt();
1542 * Hardware-reduced ACPI mode initialization:
1544 acpi_reduced_hw_init();
1549 int __init acpi_boot_init(void)
1551 /* those are executed after early-quirks are executed */
1552 dmi_check_system(acpi_dmi_table_late);
1555 * If acpi_disabled, bail out
1560 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1563 * set sci_int and PM timer address
1565 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1568 * Process the Multiple APIC Description Table (MADT), if present
1570 acpi_process_madt();
1572 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1575 x86_init.pci.init = pci_acpi_init;
1580 static int __init parse_acpi(char *arg)
1585 /* "acpi=off" disables both ACPI table parsing and interpreter */
1586 if (strcmp(arg, "off") == 0) {
1589 /* acpi=force to over-ride black-list */
1590 else if (strcmp(arg, "force") == 0) {
1594 /* acpi=strict disables out-of-spec workarounds */
1595 else if (strcmp(arg, "strict") == 0) {
1598 /* acpi=rsdt use RSDT instead of XSDT */
1599 else if (strcmp(arg, "rsdt") == 0) {
1600 acpi_gbl_do_not_use_xsdt = TRUE;
1602 /* "acpi=noirq" disables ACPI interrupt routing */
1603 else if (strcmp(arg, "noirq") == 0) {
1606 /* "acpi=copy_dsdt" copys DSDT */
1607 else if (strcmp(arg, "copy_dsdt") == 0) {
1608 acpi_gbl_copy_dsdt_locally = 1;
1610 /* "acpi=nocmcff" disables FF mode for corrected errors */
1611 else if (strcmp(arg, "nocmcff") == 0) {
1612 acpi_disable_cmcff = 1;
1614 /* Core will printk when we return error. */
1619 early_param("acpi", parse_acpi);
1621 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1622 static int __init parse_pci(char *arg)
1624 if (arg && strcmp(arg, "noacpi") == 0)
1628 early_param("pci", parse_pci);
1630 int __init acpi_mps_check(void)
1632 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1633 /* mptable code is not built-in*/
1634 if (acpi_disabled || acpi_noirq) {
1635 printk(KERN_WARNING "MPS support code is not built-in.\n"
1636 "Using acpi=off or acpi=noirq or pci=noacpi "
1637 "may have problem\n");
1644 #ifdef CONFIG_X86_IO_APIC
1645 static int __init parse_acpi_skip_timer_override(char *arg)
1647 acpi_skip_timer_override = 1;
1650 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1652 static int __init parse_acpi_use_timer_override(char *arg)
1654 acpi_use_timer_override = 1;
1657 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1658 #endif /* CONFIG_X86_IO_APIC */
1660 static int __init setup_acpi_sci(char *s)
1664 if (!strcmp(s, "edge"))
1665 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1666 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1667 else if (!strcmp(s, "level"))
1668 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1669 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1670 else if (!strcmp(s, "high"))
1671 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1672 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1673 else if (!strcmp(s, "low"))
1674 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1675 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1680 early_param("acpi_sci", setup_acpi_sci);
1682 int __acpi_acquire_global_lock(unsigned int *lock)
1684 unsigned int old, new, val;
1687 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1688 val = cmpxchg(lock, old, new);
1689 } while (unlikely (val != old));
1690 return (new < 3) ? -1 : 0;
1693 int __acpi_release_global_lock(unsigned int *lock)
1695 unsigned int old, new, val;
1699 val = cmpxchg(lock, old, new);
1700 } while (unlikely (val != old));
1704 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1706 e820_add_region(addr, size, E820_ACPI);