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/irqdomain.h>
35 #include <linux/slab.h>
36 #include <linux/bootmem.h>
37 #include <linux/ioport.h>
38 #include <linux/pci.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 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
329 struct mpc_intsrc mp_irq;
332 * Convert 'gsi' to 'ioapic.pin'.
334 ioapic = mp_find_ioapic(gsi);
337 pin = mp_find_ioapic_pin(ioapic, gsi);
340 * TBD: This check is for faulty timer entries, where the override
341 * erroneously sets the trigger to level, resulting in a HUGE
342 * increase of timer interrupts!
344 if ((bus_irq == 0) && (trigger == 3))
347 mp_irq.type = MP_INTSRC;
348 mp_irq.irqtype = mp_INT;
349 mp_irq.irqflag = (trigger << 2) | polarity;
350 mp_irq.srcbus = MP_ISA_BUS;
351 mp_irq.srcbusirq = bus_irq; /* IRQ */
352 mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
353 mp_irq.dstirq = pin; /* INTIN# */
355 mp_save_irq(&mp_irq);
358 * Reset default identity mapping if gsi is also an legacy IRQ,
359 * otherwise there will be more than one entry with the same GSI
360 * and acpi_isa_irq_to_gsi() may give wrong result.
362 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
363 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
364 isa_irq_to_gsi[bus_irq] = gsi;
367 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
370 #ifdef CONFIG_X86_MPPARSE
371 struct mpc_intsrc mp_irq;
372 struct pci_dev *pdev;
373 unsigned char number;
380 if (!dev || !dev_is_pci(dev))
383 pdev = to_pci_dev(dev);
384 number = pdev->bus->number;
387 /* print the entry should happen on mptable identically */
388 mp_irq.type = MP_INTSRC;
389 mp_irq.irqtype = mp_INT;
390 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
391 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
392 mp_irq.srcbus = number;
393 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
394 ioapic = mp_find_ioapic(gsi);
395 mp_irq.dstapic = mpc_ioapic_id(ioapic);
396 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
398 mp_save_irq(&mp_irq);
403 static int mp_register_gsi(struct device *dev, u32 gsi, int trigger,
408 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
411 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
412 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
413 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
414 if (mp_set_gsi_attr(gsi, trigger, polarity, node)) {
415 pr_warn("Failed to set pin attr for GSI%d\n", gsi);
419 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC);
423 /* Don't set up the ACPI SCI because it's already set up */
424 if (enable_update_mptable && acpi_gbl_FADT.sci_interrupt != gsi)
425 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
430 static void mp_unregister_gsi(u32 gsi)
434 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
437 irq = mp_map_gsi_to_irq(gsi, 0);
442 static struct irq_domain_ops acpi_irqdomain_ops = {
443 .map = mp_irqdomain_map,
444 .unmap = mp_irqdomain_unmap,
448 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
450 struct acpi_madt_io_apic *ioapic = NULL;
451 struct ioapic_domain_cfg cfg = {
452 .type = IOAPIC_DOMAIN_DYNAMIC,
453 .ops = &acpi_irqdomain_ops,
456 ioapic = (struct acpi_madt_io_apic *)header;
458 if (BAD_MADT_ENTRY(ioapic, end))
461 acpi_table_print_madt_entry(header);
463 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
464 if (ioapic->global_irq_base < nr_legacy_irqs())
465 cfg.type = IOAPIC_DOMAIN_LEGACY;
467 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
474 * Parse Interrupt Source Override for the ACPI SCI
476 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
478 if (trigger == 0) /* compatible SCI trigger is level */
481 if (polarity == 0) /* compatible SCI polarity is low */
484 /* Command-line over-ride via acpi_sci= */
485 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
486 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
488 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
489 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
491 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
494 * stash over-ride to indicate we've been here
495 * and for later update of acpi_gbl_FADT
497 acpi_sci_override_gsi = gsi;
502 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
503 const unsigned long end)
505 struct acpi_madt_interrupt_override *intsrc = NULL;
507 intsrc = (struct acpi_madt_interrupt_override *)header;
509 if (BAD_MADT_ENTRY(intsrc, end))
512 acpi_table_print_madt_entry(header);
514 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
515 acpi_sci_ioapic_setup(intsrc->source_irq,
516 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
517 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
522 if (intsrc->source_irq == 0) {
523 if (acpi_skip_timer_override) {
524 printk(PREFIX "BIOS IRQ0 override ignored.\n");
528 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
529 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
530 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
531 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
535 mp_override_legacy_irq(intsrc->source_irq,
536 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
537 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
544 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
546 struct acpi_madt_nmi_source *nmi_src = NULL;
548 nmi_src = (struct acpi_madt_nmi_source *)header;
550 if (BAD_MADT_ENTRY(nmi_src, end))
553 acpi_table_print_madt_entry(header);
555 /* TBD: Support nimsrc entries? */
560 #endif /* CONFIG_X86_IO_APIC */
563 * acpi_pic_sci_set_trigger()
565 * use ELCR to set PIC-mode trigger type for SCI
567 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
568 * it may require Edge Trigger -- use "acpi_sci=edge"
570 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
571 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
572 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
573 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
576 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
578 unsigned int mask = 1 << irq;
579 unsigned int old, new;
581 /* Real old ELCR mask */
582 old = inb(0x4d0) | (inb(0x4d1) << 8);
585 * If we use ACPI to set PCI IRQs, then we should clear ELCR
586 * since we will set it correctly as we enable the PCI irq
589 new = acpi_noirq ? old : 0;
592 * Update SCI information in the ELCR, it isn't in the PCI
596 case 1: /* Edge - clear */
599 case 3: /* Level - set */
607 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
609 outb(new >> 8, 0x4d1);
612 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
614 int rc, irq, trigger, polarity;
616 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
621 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
623 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
624 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
625 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
634 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
636 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
638 if (isa_irq < nr_legacy_irqs() &&
639 isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
640 *gsi = isa_irq_to_gsi[isa_irq];
647 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
648 int trigger, int polarity)
652 * Make sure all (legacy) PCI IRQs are set as level-triggered.
654 if (trigger == ACPI_LEVEL_SENSITIVE)
655 eisa_set_level_irq(gsi);
661 #ifdef CONFIG_X86_LOCAL_APIC
662 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
663 int trigger, int polarity)
667 #ifdef CONFIG_X86_IO_APIC
668 mutex_lock(&acpi_ioapic_lock);
669 irq = mp_register_gsi(dev, gsi, trigger, polarity);
670 mutex_unlock(&acpi_ioapic_lock);
676 static void acpi_unregister_gsi_ioapic(u32 gsi)
678 #ifdef CONFIG_X86_IO_APIC
679 mutex_lock(&acpi_ioapic_lock);
680 mp_unregister_gsi(gsi);
681 mutex_unlock(&acpi_ioapic_lock);
686 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
687 int trigger, int polarity) = acpi_register_gsi_pic;
688 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
690 #ifdef CONFIG_ACPI_SLEEP
691 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
693 int (*acpi_suspend_lowlevel)(void);
697 * success: return IRQ number (>=0)
698 * failure: return < 0
700 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
702 return __acpi_register_gsi(dev, gsi, trigger, polarity);
704 EXPORT_SYMBOL_GPL(acpi_register_gsi);
706 void acpi_unregister_gsi(u32 gsi)
708 if (__acpi_unregister_gsi)
709 __acpi_unregister_gsi(gsi);
711 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
713 #ifdef CONFIG_X86_LOCAL_APIC
714 static void __init acpi_set_irq_model_ioapic(void)
716 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
717 __acpi_register_gsi = acpi_register_gsi_ioapic;
718 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
724 * ACPI based hotplug support for CPU
726 #ifdef CONFIG_ACPI_HOTPLUG_CPU
727 #include <acpi/processor.h>
729 static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
731 #ifdef CONFIG_ACPI_NUMA
734 nid = acpi_get_node(handle);
736 set_apicid_to_node(physid, nid);
737 numa_set_node(cpu, nid);
742 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
746 cpu = acpi_register_lapic(physid, ACPI_MADT_ENABLED);
748 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
752 acpi_processor_set_pdc(handle);
753 acpi_map_cpu2node(handle, cpu, physid);
759 /* wrapper to silence section mismatch warning */
760 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
762 return _acpi_map_lsapic(handle, physid, pcpu);
764 EXPORT_SYMBOL(acpi_map_cpu);
766 int acpi_unmap_cpu(int cpu)
768 #ifdef CONFIG_ACPI_NUMA
769 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
772 per_cpu(x86_cpu_to_apicid, cpu) = -1;
773 set_cpu_present(cpu, false);
778 EXPORT_SYMBOL(acpi_unmap_cpu);
779 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
781 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
784 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
787 struct ioapic_domain_cfg cfg = {
788 .type = IOAPIC_DOMAIN_DYNAMIC,
789 .ops = &acpi_irqdomain_ops,
792 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
794 unsigned long long uid;
797 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
799 if (ACPI_FAILURE(status)) {
800 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
803 ioapic_id = (int)uid;
806 mutex_lock(&acpi_ioapic_lock);
807 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
808 mutex_unlock(&acpi_ioapic_lock);
813 EXPORT_SYMBOL(acpi_register_ioapic);
815 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
819 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
820 mutex_lock(&acpi_ioapic_lock);
821 ret = mp_unregister_ioapic(gsi_base);
822 mutex_unlock(&acpi_ioapic_lock);
827 EXPORT_SYMBOL(acpi_unregister_ioapic);
830 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
831 * has been registered
832 * @handle: ACPI handle of the IOAPIC deivce
833 * @gsi_base: GSI base associated with the IOAPIC
835 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
836 * with acpi_register_ioapic()/acpi_unregister_ioapic().
838 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
842 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
843 mutex_lock(&acpi_ioapic_lock);
844 ret = mp_ioapic_registered(gsi_base);
845 mutex_unlock(&acpi_ioapic_lock);
851 static int __init acpi_parse_sbf(struct acpi_table_header *table)
853 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
855 sbf_port = sb->cmos_index; /* Save CMOS port */
860 #ifdef CONFIG_HPET_TIMER
861 #include <asm/hpet.h>
863 static struct resource *hpet_res __initdata;
865 static int __init acpi_parse_hpet(struct acpi_table_header *table)
867 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
869 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
870 printk(KERN_WARNING PREFIX "HPET timers must be located in "
875 hpet_address = hpet_tbl->address.address;
876 hpet_blockid = hpet_tbl->sequence;
879 * Some broken BIOSes advertise HPET at 0x0. We really do not
880 * want to allocate a resource there.
883 printk(KERN_WARNING PREFIX
884 "HPET id: %#x base: %#lx is invalid\n",
885 hpet_tbl->id, hpet_address);
890 * Some even more broken BIOSes advertise HPET at
891 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
894 if (hpet_address == 0xfed0000000000000UL) {
895 if (!hpet_force_user) {
896 printk(KERN_WARNING PREFIX "HPET id: %#x "
897 "base: 0xfed0000000000000 is bogus\n "
898 "try hpet=force on the kernel command line to "
899 "fix it up to 0xfed00000.\n", hpet_tbl->id);
903 printk(KERN_WARNING PREFIX
904 "HPET id: %#x base: 0xfed0000000000000 fixed up "
905 "to 0xfed00000.\n", hpet_tbl->id);
909 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
910 hpet_tbl->id, hpet_address);
913 * Allocate and initialize the HPET firmware resource for adding into
914 * the resource tree during the lateinit timeframe.
916 #define HPET_RESOURCE_NAME_SIZE 9
917 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
919 hpet_res->name = (void *)&hpet_res[1];
920 hpet_res->flags = IORESOURCE_MEM;
921 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
924 hpet_res->start = hpet_address;
925 hpet_res->end = hpet_address + (1 * 1024) - 1;
931 * hpet_insert_resource inserts the HPET resources used into the resource
934 static __init int hpet_insert_resource(void)
939 return insert_resource(&iomem_resource, hpet_res);
942 late_initcall(hpet_insert_resource);
945 #define acpi_parse_hpet NULL
948 static int __init acpi_parse_fadt(struct acpi_table_header *table)
951 #ifdef CONFIG_X86_PM_TIMER
952 /* detect the location of the ACPI PM Timer */
953 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
955 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
956 ACPI_ADR_SPACE_SYSTEM_IO)
959 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
961 * "X" fields are optional extensions to the original V1.0
962 * fields, so we must selectively expand V1.0 fields if the
963 * corresponding X field is zero.
966 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
969 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
972 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
978 #ifdef CONFIG_X86_LOCAL_APIC
980 * Parse LAPIC entries in MADT
981 * returns 0 on success, < 0 on error
984 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
992 * Note that the LAPIC address is obtained from the MADT (32-bit value)
993 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
996 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
997 acpi_parse_lapic_addr_ovr, 0);
999 printk(KERN_ERR PREFIX
1000 "Error parsing LAPIC address override entry\n");
1004 register_lapic_address(acpi_lapic_addr);
1009 static int __init acpi_parse_madt_lapic_entries(void)
1018 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1019 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
1022 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1023 acpi_parse_lapic_addr_ovr, 0);
1025 printk(KERN_ERR PREFIX
1026 "Error parsing LAPIC address override entry\n");
1030 register_lapic_address(acpi_lapic_addr);
1032 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1033 acpi_parse_sapic, MAX_LOCAL_APIC);
1036 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
1037 acpi_parse_x2apic, MAX_LOCAL_APIC);
1038 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
1039 acpi_parse_lapic, MAX_LOCAL_APIC);
1041 if (!count && !x2count) {
1042 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1043 /* TBD: Cleanup to allow fallback to MPS */
1045 } else if (count < 0 || x2count < 0) {
1046 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1047 /* TBD: Cleanup to allow fallback to MPS */
1051 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1052 acpi_parse_x2apic_nmi, 0);
1053 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1054 acpi_parse_lapic_nmi, 0);
1055 if (count < 0 || x2count < 0) {
1056 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1057 /* TBD: Cleanup to allow fallback to MPS */
1062 #endif /* CONFIG_X86_LOCAL_APIC */
1064 #ifdef CONFIG_X86_IO_APIC
1065 static void __init mp_config_acpi_legacy_irqs(void)
1068 struct mpc_intsrc mp_irq;
1072 * Fabricate the legacy ISA bus (bus #31).
1074 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1076 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1077 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1080 * Use the default configuration for the IRQs 0-15. Unless
1081 * overridden by (MADT) interrupt source override entries.
1083 for (i = 0; i < nr_legacy_irqs(); i++) {
1085 unsigned int dstapic;
1089 /* Locate the gsi that irq i maps to. */
1090 if (acpi_isa_irq_to_gsi(i, &gsi))
1094 * Locate the IOAPIC that manages the ISA IRQ.
1096 ioapic = mp_find_ioapic(gsi);
1099 pin = mp_find_ioapic_pin(ioapic, gsi);
1100 dstapic = mpc_ioapic_id(ioapic);
1102 for (idx = 0; idx < mp_irq_entries; idx++) {
1103 struct mpc_intsrc *irq = mp_irqs + idx;
1105 /* Do we already have a mapping for this ISA IRQ? */
1106 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1109 /* Do we already have a mapping for this IOAPIC pin */
1110 if (irq->dstapic == dstapic && irq->dstirq == pin)
1114 if (idx != mp_irq_entries) {
1115 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1116 continue; /* IRQ already used */
1119 mp_irq.type = MP_INTSRC;
1120 mp_irq.irqflag = 0; /* Conforming */
1121 mp_irq.srcbus = MP_ISA_BUS;
1122 mp_irq.dstapic = dstapic;
1123 mp_irq.irqtype = mp_INT;
1124 mp_irq.srcbusirq = i; /* Identity mapped */
1125 mp_irq.dstirq = pin;
1127 mp_save_irq(&mp_irq);
1132 * Parse IOAPIC related entries in MADT
1133 * returns 0 on success, < 0 on error
1135 static int __init acpi_parse_madt_ioapic_entries(void)
1140 * ACPI interpreter is required to complete interrupt setup,
1141 * so if it is off, don't enumerate the io-apics with ACPI.
1142 * If MPS is present, it will handle them,
1143 * otherwise the system will stay in PIC mode
1145 if (acpi_disabled || acpi_noirq)
1152 * if "noapic" boot option, don't look for IO-APICs
1154 if (skip_ioapic_setup) {
1155 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1156 "due to 'noapic' option.\n");
1160 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1163 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1165 } else if (count < 0) {
1166 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1170 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1171 acpi_parse_int_src_ovr, nr_irqs);
1173 printk(KERN_ERR PREFIX
1174 "Error parsing interrupt source overrides entry\n");
1175 /* TBD: Cleanup to allow fallback to MPS */
1180 * If BIOS did not supply an INT_SRC_OVR for the SCI
1181 * pretend we got one so we can set the SCI flags.
1183 if (!acpi_sci_override_gsi)
1184 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1185 acpi_gbl_FADT.sci_interrupt);
1187 /* Fill in identity legacy mappings where no override */
1188 mp_config_acpi_legacy_irqs();
1190 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1191 acpi_parse_nmi_src, nr_irqs);
1193 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1194 /* TBD: Cleanup to allow fallback to MPS */
1201 static inline int acpi_parse_madt_ioapic_entries(void)
1205 #endif /* !CONFIG_X86_IO_APIC */
1207 static void __init early_acpi_process_madt(void)
1209 #ifdef CONFIG_X86_LOCAL_APIC
1212 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1215 * Parse MADT LAPIC entries
1217 error = early_acpi_parse_madt_lapic_addr_ovr();
1220 smp_found_config = 1;
1222 if (error == -EINVAL) {
1224 * Dell Precision Workstation 410, 610 come here.
1226 printk(KERN_ERR PREFIX
1227 "Invalid BIOS MADT, disabling ACPI\n");
1234 static void __init acpi_process_madt(void)
1236 #ifdef CONFIG_X86_LOCAL_APIC
1239 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1242 * Parse MADT LAPIC entries
1244 error = acpi_parse_madt_lapic_entries();
1249 * Parse MADT IO-APIC entries
1251 mutex_lock(&acpi_ioapic_lock);
1252 error = acpi_parse_madt_ioapic_entries();
1253 mutex_unlock(&acpi_ioapic_lock);
1255 acpi_set_irq_model_ioapic();
1257 smp_found_config = 1;
1260 if (error == -EINVAL) {
1262 * Dell Precision Workstation 410, 610 come here.
1264 printk(KERN_ERR PREFIX
1265 "Invalid BIOS MADT, disabling ACPI\n");
1270 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1271 * In the event an MPS table was found, forget it.
1272 * Boot with "acpi=off" to use MPS on such a system.
1274 if (smp_found_config) {
1275 printk(KERN_WARNING PREFIX
1276 "No APIC-table, disabling MPS\n");
1277 smp_found_config = 0;
1282 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1283 * processors, where MPS only supports physical.
1285 if (acpi_lapic && acpi_ioapic)
1286 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1288 else if (acpi_lapic)
1289 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1290 "configuration information\n");
1295 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1298 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1305 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1308 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1315 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1318 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1322 "Warning: DMI blacklist says broken, but acpi forced\n");
1328 * Force ignoring BIOS IRQ0 override
1330 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1332 if (!acpi_skip_timer_override) {
1333 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1335 acpi_skip_timer_override = 1;
1341 * ACPI offers an alternative platform interface model that removes
1342 * ACPI hardware requirements for platforms that do not implement
1343 * the PC Architecture.
1345 * We initialize the Hardware-reduced ACPI model here:
1347 static void __init acpi_reduced_hw_init(void)
1349 if (acpi_gbl_reduced_hardware) {
1351 * Override x86_init functions and bypass legacy pic
1352 * in Hardware-reduced ACPI mode
1354 x86_init.timers.timer_init = x86_init_noop;
1355 x86_init.irqs.pre_vector_init = x86_init_noop;
1356 legacy_pic = &null_legacy_pic;
1361 * If your system is blacklisted here, but you find that acpi=force
1362 * works for you, please contact linux-acpi@vger.kernel.org
1364 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1366 * Boxes that need ACPI disabled
1369 .callback = dmi_disable_acpi,
1370 .ident = "IBM Thinkpad",
1372 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1373 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1378 * Boxes that need ACPI PCI IRQ routing disabled
1381 .callback = disable_acpi_irq,
1382 .ident = "ASUS A7V",
1384 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1385 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1386 /* newer BIOS, Revision 1011, does work */
1387 DMI_MATCH(DMI_BIOS_VERSION,
1388 "ASUS A7V ACPI BIOS Revision 1007"),
1393 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1394 * for LPC bridge, which is needed for the PCI
1395 * interrupt links to work. DSDT fix is in bug 5966.
1396 * 2645, 2646 model numbers are shared with 600/600E/600X
1398 .callback = disable_acpi_irq,
1399 .ident = "IBM Thinkpad 600 Series 2645",
1401 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1402 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1406 .callback = disable_acpi_irq,
1407 .ident = "IBM Thinkpad 600 Series 2646",
1409 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1410 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1414 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1417 .callback = disable_acpi_pci,
1418 .ident = "ASUS PR-DLS",
1420 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1421 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1422 DMI_MATCH(DMI_BIOS_VERSION,
1423 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1424 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1428 .callback = disable_acpi_pci,
1429 .ident = "Acer TravelMate 36x Laptop",
1431 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1432 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1438 /* second table for DMI checks that should run after early-quirks */
1439 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1441 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1442 * which includes some code which overrides all temperature
1443 * trip points to 16C if the INTIN2 input of the I/O APIC
1444 * is enabled. This input is incorrectly designated the
1445 * ISA IRQ 0 via an interrupt source override even though
1446 * it is wired to the output of the master 8259A and INTIN0
1447 * is not connected at all. Force ignoring BIOS IRQ0
1448 * override in that cases.
1451 .callback = dmi_ignore_irq0_timer_override,
1452 .ident = "HP nx6115 laptop",
1454 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1455 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1459 .callback = dmi_ignore_irq0_timer_override,
1460 .ident = "HP NX6125 laptop",
1462 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1463 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1467 .callback = dmi_ignore_irq0_timer_override,
1468 .ident = "HP NX6325 laptop",
1470 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1471 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1475 .callback = dmi_ignore_irq0_timer_override,
1476 .ident = "HP 6715b laptop",
1478 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1479 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1483 .callback = dmi_ignore_irq0_timer_override,
1484 .ident = "FUJITSU SIEMENS",
1486 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1487 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1494 * acpi_boot_table_init() and acpi_boot_init()
1495 * called from setup_arch(), always.
1496 * 1. checksums all tables
1497 * 2. enumerates lapics
1498 * 3. enumerates io-apics
1500 * acpi_table_init() is separate to allow reading SRAT without
1501 * other side effects.
1503 * side effects of acpi_boot_init:
1504 * acpi_lapic = 1 if LAPIC found
1505 * acpi_ioapic = 1 if IOAPIC found
1506 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1507 * if acpi_blacklisted() acpi_disabled = 1;
1508 * acpi_irq_model=...
1512 void __init acpi_boot_table_init(void)
1514 dmi_check_system(acpi_dmi_table);
1517 * If acpi_disabled, bail out
1523 * Initialize the ACPI boot-time table parser.
1525 if (acpi_table_init()) {
1530 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1533 * blacklist may disable ACPI entirely
1535 if (acpi_blacklisted()) {
1537 printk(KERN_WARNING PREFIX "acpi=force override\n");
1539 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1546 int __init early_acpi_boot_init(void)
1549 * If acpi_disabled, bail out
1555 * Process the Multiple APIC Description Table (MADT), if present
1557 early_acpi_process_madt();
1560 * Hardware-reduced ACPI mode initialization:
1562 acpi_reduced_hw_init();
1567 int __init acpi_boot_init(void)
1569 /* those are executed after early-quirks are executed */
1570 dmi_check_system(acpi_dmi_table_late);
1573 * If acpi_disabled, bail out
1578 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1581 * set sci_int and PM timer address
1583 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1586 * Process the Multiple APIC Description Table (MADT), if present
1588 acpi_process_madt();
1590 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1593 x86_init.pci.init = pci_acpi_init;
1598 static int __init parse_acpi(char *arg)
1603 /* "acpi=off" disables both ACPI table parsing and interpreter */
1604 if (strcmp(arg, "off") == 0) {
1607 /* acpi=force to over-ride black-list */
1608 else if (strcmp(arg, "force") == 0) {
1612 /* acpi=strict disables out-of-spec workarounds */
1613 else if (strcmp(arg, "strict") == 0) {
1616 /* acpi=rsdt use RSDT instead of XSDT */
1617 else if (strcmp(arg, "rsdt") == 0) {
1618 acpi_gbl_do_not_use_xsdt = TRUE;
1620 /* "acpi=noirq" disables ACPI interrupt routing */
1621 else if (strcmp(arg, "noirq") == 0) {
1624 /* "acpi=copy_dsdt" copys DSDT */
1625 else if (strcmp(arg, "copy_dsdt") == 0) {
1626 acpi_gbl_copy_dsdt_locally = 1;
1628 /* "acpi=nocmcff" disables FF mode for corrected errors */
1629 else if (strcmp(arg, "nocmcff") == 0) {
1630 acpi_disable_cmcff = 1;
1632 /* Core will printk when we return error. */
1637 early_param("acpi", parse_acpi);
1639 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1640 static int __init parse_pci(char *arg)
1642 if (arg && strcmp(arg, "noacpi") == 0)
1646 early_param("pci", parse_pci);
1648 int __init acpi_mps_check(void)
1650 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1651 /* mptable code is not built-in*/
1652 if (acpi_disabled || acpi_noirq) {
1653 printk(KERN_WARNING "MPS support code is not built-in.\n"
1654 "Using acpi=off or acpi=noirq or pci=noacpi "
1655 "may have problem\n");
1662 #ifdef CONFIG_X86_IO_APIC
1663 static int __init parse_acpi_skip_timer_override(char *arg)
1665 acpi_skip_timer_override = 1;
1668 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1670 static int __init parse_acpi_use_timer_override(char *arg)
1672 acpi_use_timer_override = 1;
1675 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1676 #endif /* CONFIG_X86_IO_APIC */
1678 static int __init setup_acpi_sci(char *s)
1682 if (!strcmp(s, "edge"))
1683 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1684 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1685 else if (!strcmp(s, "level"))
1686 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1687 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1688 else if (!strcmp(s, "high"))
1689 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1690 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1691 else if (!strcmp(s, "low"))
1692 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1693 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1698 early_param("acpi_sci", setup_acpi_sci);
1700 int __acpi_acquire_global_lock(unsigned int *lock)
1702 unsigned int old, new, val;
1705 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1706 val = cmpxchg(lock, old, new);
1707 } while (unlikely (val != old));
1708 return (new < 3) ? -1 : 0;
1711 int __acpi_release_global_lock(unsigned int *lock)
1713 unsigned int old, new, val;
1717 val = cmpxchg(lock, old, new);
1718 } while (unlikely (val != old));
1722 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1724 e820_add_region(addr, size, E820_ACPI);