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/pci_x86.h>
40 #include <asm/pgtable.h>
41 #include <asm/io_apic.h>
44 #include <asm/mpspec.h>
47 static int __initdata acpi_force = 0;
50 EXPORT_SYMBOL(acpi_disabled);
53 # include <asm/proto.h>
54 # include <asm/numa_64.h>
57 #define BAD_MADT_ENTRY(entry, end) ( \
58 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
59 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
61 #define PREFIX "ACPI: "
63 int acpi_noirq; /* skip ACPI IRQ initialization */
64 int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
65 EXPORT_SYMBOL(acpi_pci_disabled);
71 u8 acpi_sci_flags __initdata;
72 int acpi_sci_override_gsi __initdata;
74 int acpi_skip_timer_override __initdata;
75 int acpi_use_timer_override __initdata;
76 int acpi_fix_pin2_polarity __initdata;
78 #ifdef CONFIG_X86_LOCAL_APIC
79 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
82 #define acpi_skip_timer_override 0
83 #define acpi_fix_pin2_polarity 0
86 #ifndef __HAVE_ARCH_CMPXCHG
87 #warning ACPI uses CMPXCHG, i486 and later hardware
90 /* --------------------------------------------------------------------------
91 Boot-time Configuration
92 -------------------------------------------------------------------------- */
95 * The default interrupt routing model is PIC (8259). This gets
96 * overridden if IOAPICs are enumerated (below).
98 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
102 * ISA irqs by default are the first 16 gsis but can be
103 * any gsi as specified by an interrupt source override.
105 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
106 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
109 static unsigned int gsi_to_irq(unsigned int gsi)
111 unsigned int irq = gsi + NR_IRQS_LEGACY;
114 for (i = 0; i < NR_IRQS_LEGACY; i++) {
115 if (isa_irq_to_gsi[i] == gsi) {
120 /* Provide an identity mapping of gsi == irq
121 * except on truly weird platforms that have
122 * non isa irqs in the first 16 gsis.
124 if (gsi >= NR_IRQS_LEGACY)
132 static u32 irq_to_gsi(int irq)
136 if (irq < NR_IRQS_LEGACY)
137 gsi = isa_irq_to_gsi[irq];
138 else if (irq < gsi_top)
140 else if (irq < (gsi_top + NR_IRQS_LEGACY))
149 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
150 * to map the target physical address. The problem is that set_fixmap()
151 * provides a single page, and it is possible that the page is not
153 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
154 * i.e. until the next __va_range() call.
156 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
157 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
158 * count idx down while incrementing the phys address.
160 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
166 return early_ioremap(phys, size);
168 void __init __acpi_unmap_table(char *map, unsigned long size)
173 early_iounmap(map, size);
176 #ifdef CONFIG_X86_LOCAL_APIC
177 static int __init acpi_parse_madt(struct acpi_table_header *table)
179 struct acpi_table_madt *madt = NULL;
184 madt = (struct acpi_table_madt *)table;
186 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
192 acpi_lapic_addr = (u64) madt->address;
194 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
198 default_acpi_madt_oem_check(madt->header.oem_id,
199 madt->header.oem_table_id);
205 static void __cpuinit acpi_register_lapic(int id, u8 enabled)
208 unsigned int ver = 0;
210 if (id >= (MAX_LOCAL_APIC-1)) {
211 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
220 if (boot_cpu_physical_apicid != -1U)
221 ver = apic_version[boot_cpu_physical_apicid];
223 generic_processor_info(id, ver);
228 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
230 struct acpi_madt_local_x2apic *processor = NULL;
234 processor = (struct acpi_madt_local_x2apic *)header;
236 if (BAD_MADT_ENTRY(processor, end))
239 acpi_table_print_madt_entry(header);
241 apic_id = processor->local_apic_id;
242 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
243 #ifdef CONFIG_X86_X2APIC
245 * We need to register disabled CPU as well to permit
246 * counting disabled CPUs. This allows us to size
247 * cpus_possible_map more accurately, to permit
248 * to not preallocating memory for all NR_CPUS
249 * when we use CPU hotplug.
251 if (!apic->apic_id_valid(apic_id) && enabled)
252 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
254 acpi_register_lapic(apic_id, enabled);
255 #elif !defined(CONFIG_XEN)
256 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
263 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
265 struct acpi_madt_local_apic *processor = NULL;
267 processor = (struct acpi_madt_local_apic *)header;
269 if (BAD_MADT_ENTRY(processor, end))
272 acpi_table_print_madt_entry(header);
275 * We need to register disabled CPU as well to permit
276 * counting disabled CPUs. This allows us to size
277 * cpus_possible_map more accurately, to permit
278 * to not preallocating memory for all NR_CPUS
279 * when we use CPU hotplug.
281 acpi_register_lapic(processor->id, /* APIC ID */
282 processor->lapic_flags & ACPI_MADT_ENABLED);
288 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
290 struct acpi_madt_local_sapic *processor = NULL;
292 processor = (struct acpi_madt_local_sapic *)header;
294 if (BAD_MADT_ENTRY(processor, end))
297 acpi_table_print_madt_entry(header);
299 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
300 processor->lapic_flags & ACPI_MADT_ENABLED);
306 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
307 const unsigned long end)
310 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
312 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
314 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
317 acpi_lapic_addr = lapic_addr_ovr->address;
324 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
325 const unsigned long end)
327 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
329 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
331 if (BAD_MADT_ENTRY(x2apic_nmi, end))
334 acpi_table_print_madt_entry(header);
336 if (x2apic_nmi->lint != 1)
337 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
343 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
345 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
347 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
349 if (BAD_MADT_ENTRY(lapic_nmi, end))
352 acpi_table_print_madt_entry(header);
354 if (lapic_nmi->lint != 1)
355 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
360 #endif /*CONFIG_X86_LOCAL_APIC */
362 #ifdef CONFIG_X86_IO_APIC
365 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
367 struct acpi_madt_io_apic *ioapic = NULL;
369 ioapic = (struct acpi_madt_io_apic *)header;
371 if (BAD_MADT_ENTRY(ioapic, end))
374 acpi_table_print_madt_entry(header);
376 mp_register_ioapic(ioapic->id,
377 ioapic->address, ioapic->global_irq_base);
383 * Parse Interrupt Source Override for the ACPI SCI
385 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
387 if (trigger == 0) /* compatible SCI trigger is level */
390 if (polarity == 0) /* compatible SCI polarity is low */
393 /* Command-line over-ride via acpi_sci= */
394 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
395 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
397 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
398 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
401 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
402 * If GSI is < 16, this will update its flags,
403 * else it will create a new mp_irqs[] entry.
405 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
408 * stash over-ride to indicate we've been here
409 * and for later update of acpi_gbl_FADT
411 acpi_sci_override_gsi = gsi;
416 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
417 const unsigned long end)
419 struct acpi_madt_interrupt_override *intsrc = NULL;
421 intsrc = (struct acpi_madt_interrupt_override *)header;
423 if (BAD_MADT_ENTRY(intsrc, end))
426 acpi_table_print_madt_entry(header);
428 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
429 acpi_sci_ioapic_setup(intsrc->source_irq,
430 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
431 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
436 if (intsrc->source_irq == 0 && intsrc->global_irq == 2) {
437 if (acpi_skip_timer_override) {
438 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
441 if (acpi_fix_pin2_polarity && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
442 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
443 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
447 mp_override_legacy_irq(intsrc->source_irq,
448 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
449 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
456 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
458 struct acpi_madt_nmi_source *nmi_src = NULL;
460 nmi_src = (struct acpi_madt_nmi_source *)header;
462 if (BAD_MADT_ENTRY(nmi_src, end))
465 acpi_table_print_madt_entry(header);
467 /* TBD: Support nimsrc entries? */
472 #endif /* CONFIG_X86_IO_APIC */
475 * acpi_pic_sci_set_trigger()
477 * use ELCR to set PIC-mode trigger type for SCI
479 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
480 * it may require Edge Trigger -- use "acpi_sci=edge"
482 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
483 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
484 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
485 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
488 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
490 unsigned int mask = 1 << irq;
491 unsigned int old, new;
493 /* Real old ELCR mask */
494 old = inb(0x4d0) | (inb(0x4d1) << 8);
497 * If we use ACPI to set PCI IRQs, then we should clear ELCR
498 * since we will set it correctly as we enable the PCI irq
501 new = acpi_noirq ? old : 0;
504 * Update SCI information in the ELCR, it isn't in the PCI
508 case 1: /* Edge - clear */
511 case 3: /* Level - set */
519 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
521 outb(new >> 8, 0x4d1);
524 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
526 *irq = gsi_to_irq(gsi);
528 #ifdef CONFIG_X86_IO_APIC
529 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
530 setup_IO_APIC_irq_extra(gsi);
535 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
537 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
541 *gsi = irq_to_gsi(isa_irq);
545 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
546 int trigger, int polarity)
550 * Make sure all (legacy) PCI IRQs are set as level-triggered.
552 if (trigger == ACPI_LEVEL_SENSITIVE)
553 eisa_set_level_irq(gsi);
559 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
560 int trigger, int polarity)
562 #ifdef CONFIG_X86_IO_APIC
563 gsi = mp_register_gsi(dev, gsi, trigger, polarity);
569 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
570 int trigger, int polarity) = acpi_register_gsi_pic;
573 * success: return IRQ number (>=0)
574 * failure: return < 0
576 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
579 unsigned int plat_gsi = gsi;
581 plat_gsi = (*__acpi_register_gsi)(dev, gsi, trigger, polarity);
582 irq = gsi_to_irq(plat_gsi);
587 void __init acpi_set_irq_model_pic(void)
589 acpi_irq_model = ACPI_IRQ_MODEL_PIC;
590 __acpi_register_gsi = acpi_register_gsi_pic;
594 void __init acpi_set_irq_model_ioapic(void)
596 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
597 __acpi_register_gsi = acpi_register_gsi_ioapic;
602 * ACPI based hotplug support for CPU
604 #ifdef CONFIG_ACPI_HOTPLUG_CPU
605 #include <acpi/processor.h>
608 static void __cpuinit acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
610 #ifdef CONFIG_ACPI_NUMA
613 nid = acpi_get_node(handle);
614 if (nid == -1 || !node_online(nid))
616 set_apicid_to_node(physid, nid);
617 numa_set_node(cpu, nid);
621 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
623 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
624 union acpi_object *obj;
625 struct acpi_madt_local_apic *lapic;
626 cpumask_var_t tmp_map, new_map;
629 int retval = -ENOMEM;
631 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
634 if (!buffer.length || !buffer.pointer)
637 obj = buffer.pointer;
638 if (obj->type != ACPI_TYPE_BUFFER ||
639 obj->buffer.length < sizeof(*lapic)) {
640 kfree(buffer.pointer);
644 lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
646 if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
647 !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
648 kfree(buffer.pointer);
654 kfree(buffer.pointer);
655 buffer.length = ACPI_ALLOCATE_BUFFER;
656 buffer.pointer = NULL;
659 if (!alloc_cpumask_var(&tmp_map, GFP_KERNEL))
662 if (!alloc_cpumask_var(&new_map, GFP_KERNEL))
665 cpumask_copy(tmp_map, cpu_present_mask);
666 acpi_register_lapic(physid, ACPI_MADT_ENABLED);
669 * If mp_register_lapic successfully generates a new logical cpu
670 * number, then the following will get us exactly what was mapped
672 cpumask_andnot(new_map, cpu_present_mask, tmp_map);
673 if (cpumask_empty(new_map)) {
674 printk ("Unable to map lapic to logical cpu number\n");
679 acpi_processor_set_pdc(handle);
681 cpu = cpumask_first(new_map);
682 acpi_map_cpu2node(handle, cpu, physid);
688 free_cpumask_var(new_map);
690 free_cpumask_var(tmp_map);
695 #define _acpi_map_lsapic(h, p) (-EINVAL)
698 /* wrapper to silence section mismatch warning */
699 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
701 return _acpi_map_lsapic(handle, pcpu);
703 EXPORT_SYMBOL(acpi_map_lsapic);
705 int acpi_unmap_lsapic(int cpu)
708 per_cpu(x86_cpu_to_apicid, cpu) = -1;
709 set_cpu_present(cpu, false);
716 EXPORT_SYMBOL(acpi_unmap_lsapic);
717 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
719 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
725 EXPORT_SYMBOL(acpi_register_ioapic);
727 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
733 EXPORT_SYMBOL(acpi_unregister_ioapic);
735 static int __init acpi_parse_sbf(struct acpi_table_header *table)
737 struct acpi_table_boot *sb;
739 sb = (struct acpi_table_boot *)table;
741 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
745 sbf_port = sb->cmos_index; /* Save CMOS port */
750 #ifdef CONFIG_HPET_TIMER
751 #include <asm/hpet.h>
753 static struct __initdata resource *hpet_res;
755 static int __init acpi_parse_hpet(struct acpi_table_header *table)
757 struct acpi_table_hpet *hpet_tbl;
759 hpet_tbl = (struct acpi_table_hpet *)table;
761 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
765 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
766 printk(KERN_WARNING PREFIX "HPET timers must be located in "
771 hpet_address = hpet_tbl->address.address;
772 hpet_blockid = hpet_tbl->sequence;
775 * Some broken BIOSes advertise HPET at 0x0. We really do not
776 * want to allocate a resource there.
779 printk(KERN_WARNING PREFIX
780 "HPET id: %#x base: %#lx is invalid\n",
781 hpet_tbl->id, hpet_address);
786 * Some even more broken BIOSes advertise HPET at
787 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
790 if (hpet_address == 0xfed0000000000000UL) {
791 if (!hpet_force_user) {
792 printk(KERN_WARNING PREFIX "HPET id: %#x "
793 "base: 0xfed0000000000000 is bogus\n "
794 "try hpet=force on the kernel command line to "
795 "fix it up to 0xfed00000.\n", hpet_tbl->id);
799 printk(KERN_WARNING PREFIX
800 "HPET id: %#x base: 0xfed0000000000000 fixed up "
801 "to 0xfed00000.\n", hpet_tbl->id);
805 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
806 hpet_tbl->id, hpet_address);
809 * Allocate and initialize the HPET firmware resource for adding into
810 * the resource tree during the lateinit timeframe.
812 #define HPET_RESOURCE_NAME_SIZE 9
813 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
815 hpet_res->name = (void *)&hpet_res[1];
816 hpet_res->flags = IORESOURCE_MEM;
817 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
820 hpet_res->start = hpet_address;
821 hpet_res->end = hpet_address + (1 * 1024) - 1;
827 * hpet_insert_resource inserts the HPET resources used into the resource
830 static __init int hpet_insert_resource(void)
835 return insert_resource(&iomem_resource, hpet_res);
838 late_initcall(hpet_insert_resource);
841 #define acpi_parse_hpet NULL
844 static int __init acpi_parse_fadt(struct acpi_table_header *table)
847 #ifdef CONFIG_X86_PM_TIMER
848 /* detect the location of the ACPI PM Timer */
849 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
851 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
852 ACPI_ADR_SPACE_SYSTEM_IO)
855 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
857 * "X" fields are optional extensions to the original V1.0
858 * fields, so we must selectively expand V1.0 fields if the
859 * corresponding X field is zero.
862 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
865 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
868 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
874 #ifdef CONFIG_X86_LOCAL_APIC
876 * Parse LAPIC entries in MADT
877 * returns 0 on success, < 0 on error
880 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
888 * Note that the LAPIC address is obtained from the MADT (32-bit value)
889 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
893 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
894 acpi_parse_lapic_addr_ovr, 0);
896 printk(KERN_ERR PREFIX
897 "Error parsing LAPIC address override entry\n");
901 register_lapic_address(acpi_lapic_addr);
906 static int __init acpi_parse_madt_lapic_entries(void)
915 * Note that the LAPIC address is obtained from the MADT (32-bit value)
916 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
920 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
921 acpi_parse_lapic_addr_ovr, 0);
923 printk(KERN_ERR PREFIX
924 "Error parsing LAPIC address override entry\n");
928 register_lapic_address(acpi_lapic_addr);
930 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
931 acpi_parse_sapic, MAX_LOCAL_APIC);
934 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
935 acpi_parse_x2apic, MAX_LOCAL_APIC);
936 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
937 acpi_parse_lapic, MAX_LOCAL_APIC);
939 if (!count && !x2count) {
940 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
941 /* TBD: Cleanup to allow fallback to MPS */
943 } else if (count < 0 || x2count < 0) {
944 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
945 /* TBD: Cleanup to allow fallback to MPS */
950 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
951 acpi_parse_x2apic_nmi, 0);
953 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
954 if (count < 0 || x2count < 0) {
955 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
956 /* TBD: Cleanup to allow fallback to MPS */
961 #endif /* CONFIG_X86_LOCAL_APIC */
963 #ifdef CONFIG_X86_IO_APIC
966 #ifdef CONFIG_X86_ES7000
967 extern int es7000_plat;
970 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
974 struct mpc_intsrc mp_irq;
977 * Convert 'gsi' to 'ioapic.pin'.
979 ioapic = mp_find_ioapic(gsi);
982 pin = mp_find_ioapic_pin(ioapic, gsi);
985 * TBD: This check is for faulty timer entries, where the override
986 * erroneously sets the trigger to level, resulting in a HUGE
987 * increase of timer interrupts!
989 if ((bus_irq == 0) && (trigger == 3))
992 mp_irq.type = MP_INTSRC;
993 mp_irq.irqtype = mp_INT;
994 mp_irq.irqflag = (trigger << 2) | polarity;
995 mp_irq.srcbus = MP_ISA_BUS;
996 mp_irq.srcbusirq = bus_irq; /* IRQ */
997 mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
998 mp_irq.dstirq = pin; /* INTIN# */
1000 mp_save_irq(&mp_irq);
1002 isa_irq_to_gsi[bus_irq] = gsi;
1005 void __init mp_config_acpi_legacy_irqs(void)
1008 struct mpc_intsrc mp_irq;
1010 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
1012 * Fabricate the legacy ISA bus (bus #31).
1014 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1016 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1017 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1019 #ifdef CONFIG_X86_ES7000
1021 * Older generations of ES7000 have no legacy identity mappings
1023 if (es7000_plat == 1)
1028 * Use the default configuration for the IRQs 0-15. Unless
1029 * overridden by (MADT) interrupt source override entries.
1031 for (i = 0; i < 16; i++) {
1033 unsigned int dstapic;
1037 /* Locate the gsi that irq i maps to. */
1038 if (acpi_isa_irq_to_gsi(i, &gsi))
1042 * Locate the IOAPIC that manages the ISA IRQ.
1044 ioapic = mp_find_ioapic(gsi);
1047 pin = mp_find_ioapic_pin(ioapic, gsi);
1048 dstapic = mpc_ioapic_id(ioapic);
1050 for (idx = 0; idx < mp_irq_entries; idx++) {
1051 struct mpc_intsrc *irq = mp_irqs + idx;
1053 /* Do we already have a mapping for this ISA IRQ? */
1054 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1057 /* Do we already have a mapping for this IOAPIC pin */
1058 if (irq->dstapic == dstapic && irq->dstirq == pin)
1062 if (idx != mp_irq_entries) {
1063 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1064 continue; /* IRQ already used */
1067 mp_irq.type = MP_INTSRC;
1068 mp_irq.irqflag = 0; /* Conforming */
1069 mp_irq.srcbus = MP_ISA_BUS;
1070 mp_irq.dstapic = dstapic;
1071 mp_irq.irqtype = mp_INT;
1072 mp_irq.srcbusirq = i; /* Identity mapped */
1073 mp_irq.dstirq = pin;
1075 mp_save_irq(&mp_irq);
1079 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
1082 #ifdef CONFIG_X86_MPPARSE
1083 struct mpc_intsrc mp_irq;
1084 struct pci_dev *pdev;
1085 unsigned char number;
1094 if (dev->bus != &pci_bus_type)
1097 pdev = to_pci_dev(dev);
1098 number = pdev->bus->number;
1099 devfn = pdev->devfn;
1101 /* print the entry should happen on mptable identically */
1102 mp_irq.type = MP_INTSRC;
1103 mp_irq.irqtype = mp_INT;
1104 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
1105 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
1106 mp_irq.srcbus = number;
1107 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
1108 ioapic = mp_find_ioapic(gsi);
1109 mp_irq.dstapic = mpc_ioapic_id(ioapic);
1110 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
1112 mp_save_irq(&mp_irq);
1117 int mp_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
1121 struct io_apic_irq_attr irq_attr;
1123 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
1126 /* Don't set up the ACPI SCI because it's already set up */
1127 if (acpi_gbl_FADT.sci_interrupt == gsi)
1130 ioapic = mp_find_ioapic(gsi);
1132 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1136 ioapic_pin = mp_find_ioapic_pin(ioapic, gsi);
1138 if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
1139 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1140 "%d-%d\n", mpc_ioapic_id(ioapic),
1145 if (enable_update_mptable)
1146 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
1148 set_io_apic_irq_attr(&irq_attr, ioapic, ioapic_pin,
1149 trigger == ACPI_EDGE_SENSITIVE ? 0 : 1,
1150 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1151 io_apic_set_pci_routing(dev, gsi_to_irq(gsi), &irq_attr);
1157 * Parse IOAPIC related entries in MADT
1158 * returns 0 on success, < 0 on error
1160 static int __init acpi_parse_madt_ioapic_entries(void)
1165 * ACPI interpreter is required to complete interrupt setup,
1166 * so if it is off, don't enumerate the io-apics with ACPI.
1167 * If MPS is present, it will handle them,
1168 * otherwise the system will stay in PIC mode
1170 if (acpi_disabled || acpi_noirq)
1177 * if "noapic" boot option, don't look for IO-APICs
1179 if (skip_ioapic_setup) {
1180 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1181 "due to 'noapic' option.\n");
1186 acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1189 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1191 } else if (count < 0) {
1192 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1197 acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
1200 printk(KERN_ERR PREFIX
1201 "Error parsing interrupt source overrides entry\n");
1202 /* TBD: Cleanup to allow fallback to MPS */
1207 * If BIOS did not supply an INT_SRC_OVR for the SCI
1208 * pretend we got one so we can set the SCI flags.
1210 if (!acpi_sci_override_gsi)
1211 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1212 acpi_gbl_FADT.sci_interrupt);
1214 /* Fill in identity legacy mappings where no override */
1215 mp_config_acpi_legacy_irqs();
1218 acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
1221 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1222 /* TBD: Cleanup to allow fallback to MPS */
1229 static inline int acpi_parse_madt_ioapic_entries(void)
1233 #endif /* !CONFIG_X86_IO_APIC */
1235 static void __init early_acpi_process_madt(void)
1237 #ifdef CONFIG_X86_LOCAL_APIC
1240 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1243 * Parse MADT LAPIC entries
1245 error = early_acpi_parse_madt_lapic_addr_ovr();
1248 smp_found_config = 1;
1250 if (error == -EINVAL) {
1252 * Dell Precision Workstation 410, 610 come here.
1254 printk(KERN_ERR PREFIX
1255 "Invalid BIOS MADT, disabling ACPI\n");
1262 static void __init acpi_process_madt(void)
1264 #ifdef CONFIG_X86_LOCAL_APIC
1267 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1270 * Parse MADT LAPIC entries
1272 error = acpi_parse_madt_lapic_entries();
1277 * Parse MADT IO-APIC entries
1279 error = acpi_parse_madt_ioapic_entries();
1281 acpi_set_irq_model_ioapic();
1283 smp_found_config = 1;
1286 if (error == -EINVAL) {
1288 * Dell Precision Workstation 410, 610 come here.
1290 printk(KERN_ERR PREFIX
1291 "Invalid BIOS MADT, disabling ACPI\n");
1296 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1297 * In the event an MPS table was found, forget it.
1298 * Boot with "acpi=off" to use MPS on such a system.
1300 if (smp_found_config) {
1301 printk(KERN_WARNING PREFIX
1302 "No APIC-table, disabling MPS\n");
1303 smp_found_config = 0;
1308 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1309 * processors, where MPS only supports physical.
1311 if (acpi_lapic && acpi_ioapic)
1312 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1314 else if (acpi_lapic)
1315 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1316 "configuration information\n");
1321 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1324 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1331 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1334 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1341 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1344 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1348 "Warning: DMI blacklist says broken, but acpi forced\n");
1355 * Force ignoring BIOS IRQ0 pin2 override
1357 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1360 * The ati_ixp4x0_rev() early PCI quirk should have set
1361 * the acpi_skip_timer_override flag already:
1363 if (!acpi_skip_timer_override) {
1364 WARN(1, KERN_ERR "ati_ixp4x0 quirk not complete.\n");
1365 pr_notice("%s detected: Ignoring BIOS IRQ0 pin2 override\n",
1367 acpi_skip_timer_override = 1;
1373 static int __init force_acpi_rsdt(const struct dmi_system_id *d)
1376 printk(KERN_NOTICE "%s detected: force use of acpi=rsdt\n",
1378 acpi_rsdt_forced = 1;
1381 "Warning: acpi=force overrules DMI blacklist: "
1389 * If your system is blacklisted here, but you find that acpi=force
1390 * works for you, please contact linux-acpi@vger.kernel.org
1392 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1394 * Boxes that need ACPI disabled
1397 .callback = dmi_disable_acpi,
1398 .ident = "IBM Thinkpad",
1400 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1401 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1406 * Boxes that need ACPI PCI IRQ routing disabled
1409 .callback = disable_acpi_irq,
1410 .ident = "ASUS A7V",
1412 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1413 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1414 /* newer BIOS, Revision 1011, does work */
1415 DMI_MATCH(DMI_BIOS_VERSION,
1416 "ASUS A7V ACPI BIOS Revision 1007"),
1421 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1422 * for LPC bridge, which is needed for the PCI
1423 * interrupt links to work. DSDT fix is in bug 5966.
1424 * 2645, 2646 model numbers are shared with 600/600E/600X
1426 .callback = disable_acpi_irq,
1427 .ident = "IBM Thinkpad 600 Series 2645",
1429 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1430 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1434 .callback = disable_acpi_irq,
1435 .ident = "IBM Thinkpad 600 Series 2646",
1437 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1438 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1442 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1445 .callback = disable_acpi_pci,
1446 .ident = "ASUS PR-DLS",
1448 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1449 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1450 DMI_MATCH(DMI_BIOS_VERSION,
1451 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1452 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1456 .callback = disable_acpi_pci,
1457 .ident = "Acer TravelMate 36x Laptop",
1459 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1460 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1465 * Boxes that need RSDT as ACPI root table
1468 .callback = force_acpi_rsdt,
1469 .ident = "ThinkPad ", /* R40e, broken C-states */
1471 DMI_MATCH(DMI_BIOS_VENDOR, "IBM"),
1472 DMI_MATCH(DMI_BIOS_VERSION, "1SET")},
1475 .callback = force_acpi_rsdt,
1476 .ident = "ThinkPad ", /* R50e, slow booting */
1478 DMI_MATCH(DMI_BIOS_VENDOR, "IBM"),
1479 DMI_MATCH(DMI_BIOS_VERSION, "1WET")},
1482 .callback = force_acpi_rsdt,
1483 .ident = "ThinkPad ", /* T40, T40p, T41, T41p, T42, T42p
1486 DMI_MATCH(DMI_BIOS_VENDOR, "IBM"),
1487 DMI_MATCH(DMI_BIOS_VERSION, "1RET")},
1493 /* second table for DMI checks that should run after early-quirks */
1494 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1496 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1497 * which includes some code which overrides all temperature
1498 * trip points to 16C if the INTIN2 input of the I/O APIC
1499 * is enabled. This input is incorrectly designated the
1500 * ISA IRQ 0 via an interrupt source override even though
1501 * it is wired to the output of the master 8259A and INTIN0
1502 * is not connected at all. Force ignoring BIOS IRQ0 pin2
1503 * override in that cases.
1506 .callback = dmi_ignore_irq0_timer_override,
1507 .ident = "HP nx6115 laptop",
1509 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1510 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1514 .callback = dmi_ignore_irq0_timer_override,
1515 .ident = "HP NX6125 laptop",
1517 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1518 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1522 .callback = dmi_ignore_irq0_timer_override,
1523 .ident = "HP NX6325 laptop",
1525 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1526 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1530 .callback = dmi_ignore_irq0_timer_override,
1531 .ident = "HP 6715b laptop",
1533 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1534 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1542 * acpi_boot_table_init() and acpi_boot_init()
1543 * called from setup_arch(), always.
1544 * 1. checksums all tables
1545 * 2. enumerates lapics
1546 * 3. enumerates io-apics
1548 * acpi_table_init() is separate to allow reading SRAT without
1549 * other side effects.
1551 * side effects of acpi_boot_init:
1552 * acpi_lapic = 1 if LAPIC found
1553 * acpi_ioapic = 1 if IOAPIC found
1554 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1555 * if acpi_blacklisted() acpi_disabled = 1;
1556 * acpi_irq_model=...
1560 void __init acpi_boot_table_init(void)
1562 dmi_check_system(acpi_dmi_table);
1565 * If acpi_disabled, bail out
1571 * Initialize the ACPI boot-time table parser.
1573 if (acpi_table_init()) {
1578 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1581 * blacklist may disable ACPI entirely
1583 if (acpi_blacklisted()) {
1585 printk(KERN_WARNING PREFIX "acpi=force override\n");
1587 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1594 int __init early_acpi_boot_init(void)
1597 * If acpi_disabled, bail out
1603 * Process the Multiple APIC Description Table (MADT), if present
1605 early_acpi_process_madt();
1610 int __init acpi_boot_init(void)
1613 /* those are executed after early-quirks are executed */
1614 dmi_check_system(acpi_dmi_table_late);
1618 * If acpi_disabled, bail out
1623 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1626 * set sci_int and PM timer address
1628 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1631 * Process the Multiple APIC Description Table (MADT), if present
1633 acpi_process_madt();
1635 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1638 x86_init.pci.init = pci_acpi_init;
1643 static int __init parse_acpi(char *arg)
1648 /* "acpi=off" disables both ACPI table parsing and interpreter */
1649 if (strcmp(arg, "off") == 0) {
1652 /* acpi=force to over-ride black-list */
1653 else if (strcmp(arg, "force") == 0) {
1657 /* acpi=strict disables out-of-spec workarounds */
1658 else if (strcmp(arg, "strict") == 0) {
1661 /* acpi=rsdt use RSDT instead of XSDT */
1662 else if (strcmp(arg, "rsdt") == 0) {
1663 acpi_rsdt_forced = 1;
1665 /* "acpi=noirq" disables ACPI interrupt routing */
1666 else if (strcmp(arg, "noirq") == 0) {
1669 /* "acpi=copy_dsdt" copys DSDT */
1670 else if (strcmp(arg, "copy_dsdt") == 0) {
1671 acpi_gbl_copy_dsdt_locally = 1;
1673 /* Core will printk when we return error. */
1678 early_param("acpi", parse_acpi);
1680 /* Alias for acpi=rsdt for compatibility with openSUSE 11.1 and SLE11 */
1681 static int __init parse_acpi_root_table(char *opt)
1683 if (!strcmp(opt, "rsdt")) {
1684 acpi_rsdt_forced = 1;
1685 printk(KERN_WARNING "acpi_root_table=rsdt is deprecated. "
1686 "Please use acpi=rsdt instead.\n");
1690 early_param("acpi_root_table", parse_acpi_root_table);
1692 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1693 static int __init parse_pci(char *arg)
1695 if (arg && strcmp(arg, "noacpi") == 0)
1699 early_param("pci", parse_pci);
1701 int __init acpi_mps_check(void)
1703 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1704 /* mptable code is not built-in*/
1705 if (acpi_disabled || acpi_noirq) {
1706 printk(KERN_WARNING "MPS support code is not built-in.\n"
1707 "Using acpi=off or acpi=noirq or pci=noacpi "
1708 "may have problem\n");
1715 #if defined(CONFIG_X86_IO_APIC) && !defined(CONFIG_XEN)
1716 static int __init parse_acpi_skip_timer_override(char *arg)
1718 acpi_skip_timer_override = 1;
1721 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1723 static int __init parse_acpi_use_timer_override(char *arg)
1725 acpi_use_timer_override = 1;
1728 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1729 #endif /* CONFIG_X86_IO_APIC */
1731 static int __init setup_acpi_sci(char *s)
1735 if (!strcmp(s, "edge"))
1736 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1737 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1738 else if (!strcmp(s, "level"))
1739 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1740 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1741 else if (!strcmp(s, "high"))
1742 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1743 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1744 else if (!strcmp(s, "low"))
1745 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1746 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1751 early_param("acpi_sci", setup_acpi_sci);
1753 int __acpi_acquire_global_lock(unsigned int *lock)
1755 unsigned int old, new, val;
1758 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1759 val = cmpxchg(lock, old, new);
1760 } while (unlikely (val != old));
1761 return (new < 3) ? -1 : 0;
1764 int __acpi_release_global_lock(unsigned int *lock)
1766 unsigned int old, new, val;
1770 val = cmpxchg(lock, old, new);
1771 } while (unlikely (val != old));