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
;
73 int acpi_skip_timer_override __initdata
;
74 int acpi_use_timer_override __initdata
;
76 #ifdef CONFIG_X86_LOCAL_APIC
77 static u64 acpi_lapic_addr __initdata
= APIC_DEFAULT_PHYS_BASE
;
80 #ifndef __HAVE_ARCH_CMPXCHG
81 #warning ACPI uses CMPXCHG, i486 and later hardware
84 /* --------------------------------------------------------------------------
85 Boot-time Configuration
86 -------------------------------------------------------------------------- */
89 * The default interrupt routing model is PIC (8259). This gets
90 * overridden if IOAPICs are enumerated (below).
92 enum acpi_irq_model_id acpi_irq_model
= ACPI_IRQ_MODEL_PIC
;
96 * ISA irqs by default are the first 16 gsis but can be
97 * any gsi as specified by an interrupt source override.
99 static u32 isa_irq_to_gsi
[NR_IRQS_LEGACY
] __read_mostly
= {
100 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
103 static unsigned int gsi_to_irq(unsigned int gsi
)
105 unsigned int irq
= gsi
+ NR_IRQS_LEGACY
;
108 for (i
= 0; i
< NR_IRQS_LEGACY
; i
++) {
109 if (isa_irq_to_gsi
[i
] == gsi
) {
114 /* Provide an identity mapping of gsi == irq
115 * except on truly weird platforms that have
116 * non isa irqs in the first 16 gsis.
118 if (gsi
>= NR_IRQS_LEGACY
)
126 static u32
irq_to_gsi(int irq
)
130 if (irq
< NR_IRQS_LEGACY
)
131 gsi
= isa_irq_to_gsi
[irq
];
132 else if (irq
< gsi_top
)
134 else if (irq
< (gsi_top
+ NR_IRQS_LEGACY
))
143 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
144 * to map the target physical address. The problem is that set_fixmap()
145 * provides a single page, and it is possible that the page is not
147 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
148 * i.e. until the next __va_range() call.
150 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
151 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
152 * count idx down while incrementing the phys address.
154 char *__init
__acpi_map_table(unsigned long phys
, unsigned long size
)
160 return early_ioremap(phys
, size
);
162 void __init
__acpi_unmap_table(char *map
, unsigned long size
)
167 early_iounmap(map
, size
);
170 #ifdef CONFIG_X86_LOCAL_APIC
171 static int __init
acpi_parse_madt(struct acpi_table_header
*table
)
173 struct acpi_table_madt
*madt
= NULL
;
178 madt
= (struct acpi_table_madt
*)table
;
180 printk(KERN_WARNING PREFIX
"Unable to map MADT\n");
185 acpi_lapic_addr
= (u64
) madt
->address
;
187 printk(KERN_DEBUG PREFIX
"Local APIC address 0x%08x\n",
191 default_acpi_madt_oem_check(madt
->header
.oem_id
,
192 madt
->header
.oem_table_id
);
197 static void __cpuinit
acpi_register_lapic(int id
, u8 enabled
)
199 unsigned int ver
= 0;
206 if (boot_cpu_physical_apicid
!= -1U)
207 ver
= apic_version
[boot_cpu_physical_apicid
];
209 generic_processor_info(id
, ver
);
213 acpi_parse_x2apic(struct acpi_subtable_header
*header
, const unsigned long end
)
215 struct acpi_madt_local_x2apic
*processor
= NULL
;
217 processor
= (struct acpi_madt_local_x2apic
*)header
;
219 if (BAD_MADT_ENTRY(processor
, end
))
222 acpi_table_print_madt_entry(header
);
224 #ifdef CONFIG_X86_X2APIC
226 * We need to register disabled CPU as well to permit
227 * counting disabled CPUs. This allows us to size
228 * cpus_possible_map more accurately, to permit
229 * to not preallocating memory for all NR_CPUS
230 * when we use CPU hotplug.
232 acpi_register_lapic(processor
->local_apic_id
, /* APIC ID */
233 processor
->lapic_flags
& ACPI_MADT_ENABLED
);
235 printk(KERN_WARNING PREFIX
"x2apic entry ignored\n");
242 acpi_parse_lapic(struct acpi_subtable_header
* header
, const unsigned long end
)
244 struct acpi_madt_local_apic
*processor
= NULL
;
246 processor
= (struct acpi_madt_local_apic
*)header
;
248 if (BAD_MADT_ENTRY(processor
, end
))
251 acpi_table_print_madt_entry(header
);
254 * We need to register disabled CPU as well to permit
255 * counting disabled CPUs. This allows us to size
256 * cpus_possible_map more accurately, to permit
257 * to not preallocating memory for all NR_CPUS
258 * when we use CPU hotplug.
260 acpi_register_lapic(processor
->id
, /* APIC ID */
261 processor
->lapic_flags
& ACPI_MADT_ENABLED
);
267 acpi_parse_sapic(struct acpi_subtable_header
*header
, const unsigned long end
)
269 struct acpi_madt_local_sapic
*processor
= NULL
;
271 processor
= (struct acpi_madt_local_sapic
*)header
;
273 if (BAD_MADT_ENTRY(processor
, end
))
276 acpi_table_print_madt_entry(header
);
278 acpi_register_lapic((processor
->id
<< 8) | processor
->eid
,/* APIC ID */
279 processor
->lapic_flags
& ACPI_MADT_ENABLED
);
285 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header
* header
,
286 const unsigned long end
)
288 struct acpi_madt_local_apic_override
*lapic_addr_ovr
= NULL
;
290 lapic_addr_ovr
= (struct acpi_madt_local_apic_override
*)header
;
292 if (BAD_MADT_ENTRY(lapic_addr_ovr
, end
))
295 acpi_lapic_addr
= lapic_addr_ovr
->address
;
301 acpi_parse_x2apic_nmi(struct acpi_subtable_header
*header
,
302 const unsigned long end
)
304 struct acpi_madt_local_x2apic_nmi
*x2apic_nmi
= NULL
;
306 x2apic_nmi
= (struct acpi_madt_local_x2apic_nmi
*)header
;
308 if (BAD_MADT_ENTRY(x2apic_nmi
, end
))
311 acpi_table_print_madt_entry(header
);
313 if (x2apic_nmi
->lint
!= 1)
314 printk(KERN_WARNING PREFIX
"NMI not connected to LINT 1!\n");
320 acpi_parse_lapic_nmi(struct acpi_subtable_header
* header
, const unsigned long end
)
322 struct acpi_madt_local_apic_nmi
*lapic_nmi
= NULL
;
324 lapic_nmi
= (struct acpi_madt_local_apic_nmi
*)header
;
326 if (BAD_MADT_ENTRY(lapic_nmi
, end
))
329 acpi_table_print_madt_entry(header
);
331 if (lapic_nmi
->lint
!= 1)
332 printk(KERN_WARNING PREFIX
"NMI not connected to LINT 1!\n");
337 #endif /*CONFIG_X86_LOCAL_APIC */
339 #ifdef CONFIG_X86_IO_APIC
342 acpi_parse_ioapic(struct acpi_subtable_header
* header
, const unsigned long end
)
344 struct acpi_madt_io_apic
*ioapic
= NULL
;
346 ioapic
= (struct acpi_madt_io_apic
*)header
;
348 if (BAD_MADT_ENTRY(ioapic
, end
))
351 acpi_table_print_madt_entry(header
);
353 mp_register_ioapic(ioapic
->id
,
354 ioapic
->address
, ioapic
->global_irq_base
);
360 * Parse Interrupt Source Override for the ACPI SCI
362 static void __init
acpi_sci_ioapic_setup(u8 bus_irq
, u16 polarity
, u16 trigger
, u32 gsi
)
364 if (trigger
== 0) /* compatible SCI trigger is level */
367 if (polarity
== 0) /* compatible SCI polarity is low */
370 /* Command-line over-ride via acpi_sci= */
371 if (acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
)
372 trigger
= (acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
) >> 2;
374 if (acpi_sci_flags
& ACPI_MADT_POLARITY_MASK
)
375 polarity
= acpi_sci_flags
& ACPI_MADT_POLARITY_MASK
;
378 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
379 * If GSI is < 16, this will update its flags,
380 * else it will create a new mp_irqs[] entry.
382 mp_override_legacy_irq(bus_irq
, polarity
, trigger
, gsi
);
385 * stash over-ride to indicate we've been here
386 * and for later update of acpi_gbl_FADT
388 acpi_sci_override_gsi
= gsi
;
393 acpi_parse_int_src_ovr(struct acpi_subtable_header
* header
,
394 const unsigned long end
)
396 struct acpi_madt_interrupt_override
*intsrc
= NULL
;
398 intsrc
= (struct acpi_madt_interrupt_override
*)header
;
400 if (BAD_MADT_ENTRY(intsrc
, end
))
403 acpi_table_print_madt_entry(header
);
405 if (intsrc
->source_irq
== acpi_gbl_FADT
.sci_interrupt
) {
406 acpi_sci_ioapic_setup(intsrc
->source_irq
,
407 intsrc
->inti_flags
& ACPI_MADT_POLARITY_MASK
,
408 (intsrc
->inti_flags
& ACPI_MADT_TRIGGER_MASK
) >> 2,
413 if (acpi_skip_timer_override
&&
414 intsrc
->source_irq
== 0 && intsrc
->global_irq
== 2) {
415 printk(PREFIX
"BIOS IRQ0 pin2 override ignored.\n");
419 mp_override_legacy_irq(intsrc
->source_irq
,
420 intsrc
->inti_flags
& ACPI_MADT_POLARITY_MASK
,
421 (intsrc
->inti_flags
& ACPI_MADT_TRIGGER_MASK
) >> 2,
428 acpi_parse_nmi_src(struct acpi_subtable_header
* header
, const unsigned long end
)
430 struct acpi_madt_nmi_source
*nmi_src
= NULL
;
432 nmi_src
= (struct acpi_madt_nmi_source
*)header
;
434 if (BAD_MADT_ENTRY(nmi_src
, end
))
437 acpi_table_print_madt_entry(header
);
439 /* TBD: Support nimsrc entries? */
444 #endif /* CONFIG_X86_IO_APIC */
447 * acpi_pic_sci_set_trigger()
449 * use ELCR to set PIC-mode trigger type for SCI
451 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
452 * it may require Edge Trigger -- use "acpi_sci=edge"
454 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
455 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
456 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
457 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
460 void __init
acpi_pic_sci_set_trigger(unsigned int irq
, u16 trigger
)
462 unsigned int mask
= 1 << irq
;
463 unsigned int old
, new;
465 /* Real old ELCR mask */
466 old
= inb(0x4d0) | (inb(0x4d1) << 8);
469 * If we use ACPI to set PCI IRQs, then we should clear ELCR
470 * since we will set it correctly as we enable the PCI irq
473 new = acpi_noirq
? old
: 0;
476 * Update SCI information in the ELCR, it isn't in the PCI
480 case 1: /* Edge - clear */
483 case 3: /* Level - set */
491 printk(PREFIX
"setting ELCR to %04x (from %04x)\n", new, old
);
493 outb(new >> 8, 0x4d1);
496 int acpi_gsi_to_irq(u32 gsi
, unsigned int *irq
)
498 *irq
= gsi_to_irq(gsi
);
500 #ifdef CONFIG_X86_IO_APIC
501 if (acpi_irq_model
== ACPI_IRQ_MODEL_IOAPIC
)
502 setup_IO_APIC_irq_extra(gsi
);
508 int acpi_isa_irq_to_gsi(unsigned isa_irq
, u32
*gsi
)
512 *gsi
= irq_to_gsi(isa_irq
);
516 static int acpi_register_gsi_pic(struct device
*dev
, u32 gsi
,
517 int trigger
, int polarity
)
521 * Make sure all (legacy) PCI IRQs are set as level-triggered.
523 if (trigger
== ACPI_LEVEL_SENSITIVE
)
524 eisa_set_level_irq(gsi
);
530 static int acpi_register_gsi_ioapic(struct device
*dev
, u32 gsi
,
531 int trigger
, int polarity
)
533 #ifdef CONFIG_X86_IO_APIC
534 gsi
= mp_register_gsi(dev
, gsi
, trigger
, polarity
);
540 int (*__acpi_register_gsi
)(struct device
*dev
, u32 gsi
,
541 int trigger
, int polarity
) = acpi_register_gsi_pic
;
544 * success: return IRQ number (>=0)
545 * failure: return < 0
547 int acpi_register_gsi(struct device
*dev
, u32 gsi
, int trigger
, int polarity
)
550 unsigned int plat_gsi
= gsi
;
552 plat_gsi
= (*__acpi_register_gsi
)(dev
, gsi
, trigger
, polarity
);
553 irq
= gsi_to_irq(plat_gsi
);
558 void __init
acpi_set_irq_model_pic(void)
560 acpi_irq_model
= ACPI_IRQ_MODEL_PIC
;
561 __acpi_register_gsi
= acpi_register_gsi_pic
;
565 void __init
acpi_set_irq_model_ioapic(void)
567 acpi_irq_model
= ACPI_IRQ_MODEL_IOAPIC
;
568 __acpi_register_gsi
= acpi_register_gsi_ioapic
;
573 * ACPI based hotplug support for CPU
575 #ifdef CONFIG_ACPI_HOTPLUG_CPU
576 #include <acpi/processor.h>
578 static void acpi_map_cpu2node(acpi_handle handle
, int cpu
, int physid
)
580 #ifdef CONFIG_ACPI_NUMA
583 nid
= acpi_get_node(handle
);
584 if (nid
== -1 || !node_online(nid
))
587 apicid_to_node
[physid
] = nid
;
588 numa_set_node(cpu
, nid
);
589 #else /* CONFIG_X86_32 */
590 apicid_2_node
[physid
] = nid
;
591 cpu_to_node_map
[cpu
] = nid
;
597 static int __cpuinit
_acpi_map_lsapic(acpi_handle handle
, int *pcpu
)
599 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
600 union acpi_object
*obj
;
601 struct acpi_madt_local_apic
*lapic
;
602 cpumask_var_t tmp_map
, new_map
;
605 int retval
= -ENOMEM
;
607 if (ACPI_FAILURE(acpi_evaluate_object(handle
, "_MAT", NULL
, &buffer
)))
610 if (!buffer
.length
|| !buffer
.pointer
)
613 obj
= buffer
.pointer
;
614 if (obj
->type
!= ACPI_TYPE_BUFFER
||
615 obj
->buffer
.length
< sizeof(*lapic
)) {
616 kfree(buffer
.pointer
);
620 lapic
= (struct acpi_madt_local_apic
*)obj
->buffer
.pointer
;
622 if (lapic
->header
.type
!= ACPI_MADT_TYPE_LOCAL_APIC
||
623 !(lapic
->lapic_flags
& ACPI_MADT_ENABLED
)) {
624 kfree(buffer
.pointer
);
630 kfree(buffer
.pointer
);
631 buffer
.length
= ACPI_ALLOCATE_BUFFER
;
632 buffer
.pointer
= NULL
;
634 if (!alloc_cpumask_var(&tmp_map
, GFP_KERNEL
))
637 if (!alloc_cpumask_var(&new_map
, GFP_KERNEL
))
640 cpumask_copy(tmp_map
, cpu_present_mask
);
641 acpi_register_lapic(physid
, lapic
->lapic_flags
& ACPI_MADT_ENABLED
);
644 * If mp_register_lapic successfully generates a new logical cpu
645 * number, then the following will get us exactly what was mapped
647 cpumask_andnot(new_map
, cpu_present_mask
, tmp_map
);
648 if (cpumask_empty(new_map
)) {
649 printk ("Unable to map lapic to logical cpu number\n");
654 acpi_processor_set_pdc(handle
);
656 cpu
= cpumask_first(new_map
);
657 acpi_map_cpu2node(handle
, cpu
, physid
);
663 free_cpumask_var(new_map
);
665 free_cpumask_var(tmp_map
);
670 /* wrapper to silence section mismatch warning */
671 int __ref
acpi_map_lsapic(acpi_handle handle
, int *pcpu
)
673 return _acpi_map_lsapic(handle
, pcpu
);
675 EXPORT_SYMBOL(acpi_map_lsapic
);
677 int acpi_unmap_lsapic(int cpu
)
679 per_cpu(x86_cpu_to_apicid
, cpu
) = -1;
680 set_cpu_present(cpu
, false);
686 EXPORT_SYMBOL(acpi_unmap_lsapic
);
687 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
689 int acpi_register_ioapic(acpi_handle handle
, u64 phys_addr
, u32 gsi_base
)
695 EXPORT_SYMBOL(acpi_register_ioapic
);
697 int acpi_unregister_ioapic(acpi_handle handle
, u32 gsi_base
)
703 EXPORT_SYMBOL(acpi_unregister_ioapic
);
705 static int __init
acpi_parse_sbf(struct acpi_table_header
*table
)
707 struct acpi_table_boot
*sb
;
709 sb
= (struct acpi_table_boot
*)table
;
711 printk(KERN_WARNING PREFIX
"Unable to map SBF\n");
715 sbf_port
= sb
->cmos_index
; /* Save CMOS port */
720 #ifdef CONFIG_HPET_TIMER
721 #include <asm/hpet.h>
723 static struct __initdata resource
*hpet_res
;
725 static int __init
acpi_parse_hpet(struct acpi_table_header
*table
)
727 struct acpi_table_hpet
*hpet_tbl
;
729 hpet_tbl
= (struct acpi_table_hpet
*)table
;
731 printk(KERN_WARNING PREFIX
"Unable to map HPET\n");
735 if (hpet_tbl
->address
.space_id
!= ACPI_SPACE_MEM
) {
736 printk(KERN_WARNING PREFIX
"HPET timers must be located in "
741 hpet_address
= hpet_tbl
->address
.address
;
742 hpet_blockid
= hpet_tbl
->sequence
;
745 * Some broken BIOSes advertise HPET at 0x0. We really do not
746 * want to allocate a resource there.
749 printk(KERN_WARNING PREFIX
750 "HPET id: %#x base: %#lx is invalid\n",
751 hpet_tbl
->id
, hpet_address
);
756 * Some even more broken BIOSes advertise HPET at
757 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
760 if (hpet_address
== 0xfed0000000000000UL
) {
761 if (!hpet_force_user
) {
762 printk(KERN_WARNING PREFIX
"HPET id: %#x "
763 "base: 0xfed0000000000000 is bogus\n "
764 "try hpet=force on the kernel command line to "
765 "fix it up to 0xfed00000.\n", hpet_tbl
->id
);
769 printk(KERN_WARNING PREFIX
770 "HPET id: %#x base: 0xfed0000000000000 fixed up "
771 "to 0xfed00000.\n", hpet_tbl
->id
);
775 printk(KERN_INFO PREFIX
"HPET id: %#x base: %#lx\n",
776 hpet_tbl
->id
, hpet_address
);
779 * Allocate and initialize the HPET firmware resource for adding into
780 * the resource tree during the lateinit timeframe.
782 #define HPET_RESOURCE_NAME_SIZE 9
783 hpet_res
= alloc_bootmem(sizeof(*hpet_res
) + HPET_RESOURCE_NAME_SIZE
);
785 hpet_res
->name
= (void *)&hpet_res
[1];
786 hpet_res
->flags
= IORESOURCE_MEM
;
787 snprintf((char *)hpet_res
->name
, HPET_RESOURCE_NAME_SIZE
, "HPET %u",
790 hpet_res
->start
= hpet_address
;
791 hpet_res
->end
= hpet_address
+ (1 * 1024) - 1;
797 * hpet_insert_resource inserts the HPET resources used into the resource
800 static __init
int hpet_insert_resource(void)
805 return insert_resource(&iomem_resource
, hpet_res
);
808 late_initcall(hpet_insert_resource
);
811 #define acpi_parse_hpet NULL
814 static int __init
acpi_parse_fadt(struct acpi_table_header
*table
)
817 #ifdef CONFIG_X86_PM_TIMER
818 /* detect the location of the ACPI PM Timer */
819 if (acpi_gbl_FADT
.header
.revision
>= FADT2_REVISION_ID
) {
821 if (acpi_gbl_FADT
.xpm_timer_block
.space_id
!=
822 ACPI_ADR_SPACE_SYSTEM_IO
)
825 pmtmr_ioport
= acpi_gbl_FADT
.xpm_timer_block
.address
;
827 * "X" fields are optional extensions to the original V1.0
828 * fields, so we must selectively expand V1.0 fields if the
829 * corresponding X field is zero.
832 pmtmr_ioport
= acpi_gbl_FADT
.pm_timer_block
;
835 pmtmr_ioport
= acpi_gbl_FADT
.pm_timer_block
;
838 printk(KERN_INFO PREFIX
"PM-Timer IO Port: %#x\n",
844 #ifdef CONFIG_X86_LOCAL_APIC
846 * Parse LAPIC entries in MADT
847 * returns 0 on success, < 0 on error
850 static int __init
early_acpi_parse_madt_lapic_addr_ovr(void)
858 * Note that the LAPIC address is obtained from the MADT (32-bit value)
859 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
863 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE
,
864 acpi_parse_lapic_addr_ovr
, 0);
866 printk(KERN_ERR PREFIX
867 "Error parsing LAPIC address override entry\n");
871 register_lapic_address(acpi_lapic_addr
);
876 static int __init
acpi_parse_madt_lapic_entries(void)
885 * Note that the LAPIC address is obtained from the MADT (32-bit value)
886 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
890 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE
,
891 acpi_parse_lapic_addr_ovr
, 0);
893 printk(KERN_ERR PREFIX
894 "Error parsing LAPIC address override entry\n");
898 register_lapic_address(acpi_lapic_addr
);
900 count
= acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC
,
901 acpi_parse_sapic
, MAX_APICS
);
904 x2count
= acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC
,
905 acpi_parse_x2apic
, MAX_APICS
);
906 count
= acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC
,
907 acpi_parse_lapic
, MAX_APICS
);
909 if (!count
&& !x2count
) {
910 printk(KERN_ERR PREFIX
"No LAPIC entries present\n");
911 /* TBD: Cleanup to allow fallback to MPS */
913 } else if (count
< 0 || x2count
< 0) {
914 printk(KERN_ERR PREFIX
"Error parsing LAPIC entry\n");
915 /* TBD: Cleanup to allow fallback to MPS */
920 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI
,
921 acpi_parse_x2apic_nmi
, 0);
923 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI
, acpi_parse_lapic_nmi
, 0);
924 if (count
< 0 || x2count
< 0) {
925 printk(KERN_ERR PREFIX
"Error parsing LAPIC NMI entry\n");
926 /* TBD: Cleanup to allow fallback to MPS */
931 #endif /* CONFIG_X86_LOCAL_APIC */
933 #ifdef CONFIG_X86_IO_APIC
936 #ifdef CONFIG_X86_ES7000
937 extern int es7000_plat
;
940 void __init
mp_override_legacy_irq(u8 bus_irq
, u8 polarity
, u8 trigger
, u32 gsi
)
944 struct mpc_intsrc mp_irq
;
947 * Convert 'gsi' to 'ioapic.pin'.
949 ioapic
= mp_find_ioapic(gsi
);
952 pin
= mp_find_ioapic_pin(ioapic
, gsi
);
955 * TBD: This check is for faulty timer entries, where the override
956 * erroneously sets the trigger to level, resulting in a HUGE
957 * increase of timer interrupts!
959 if ((bus_irq
== 0) && (trigger
== 3))
962 mp_irq
.type
= MP_INTSRC
;
963 mp_irq
.irqtype
= mp_INT
;
964 mp_irq
.irqflag
= (trigger
<< 2) | polarity
;
965 mp_irq
.srcbus
= MP_ISA_BUS
;
966 mp_irq
.srcbusirq
= bus_irq
; /* IRQ */
967 mp_irq
.dstapic
= mp_ioapics
[ioapic
].apicid
; /* APIC ID */
968 mp_irq
.dstirq
= pin
; /* INTIN# */
970 mp_save_irq(&mp_irq
);
972 isa_irq_to_gsi
[bus_irq
] = gsi
;
975 void __init
mp_config_acpi_legacy_irqs(void)
978 struct mpc_intsrc mp_irq
;
980 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
982 * Fabricate the legacy ISA bus (bus #31).
984 mp_bus_id_to_type
[MP_ISA_BUS
] = MP_BUS_ISA
;
986 set_bit(MP_ISA_BUS
, mp_bus_not_pci
);
987 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS
);
989 #ifdef CONFIG_X86_ES7000
991 * Older generations of ES7000 have no legacy identity mappings
993 if (es7000_plat
== 1)
998 * Use the default configuration for the IRQs 0-15. Unless
999 * overridden by (MADT) interrupt source override entries.
1001 for (i
= 0; i
< 16; i
++) {
1003 unsigned int dstapic
;
1007 /* Locate the gsi that irq i maps to. */
1008 if (acpi_isa_irq_to_gsi(i
, &gsi
))
1012 * Locate the IOAPIC that manages the ISA IRQ.
1014 ioapic
= mp_find_ioapic(gsi
);
1017 pin
= mp_find_ioapic_pin(ioapic
, gsi
);
1018 dstapic
= mp_ioapics
[ioapic
].apicid
;
1020 for (idx
= 0; idx
< mp_irq_entries
; idx
++) {
1021 struct mpc_intsrc
*irq
= mp_irqs
+ idx
;
1023 /* Do we already have a mapping for this ISA IRQ? */
1024 if (irq
->srcbus
== MP_ISA_BUS
&& irq
->srcbusirq
== i
)
1027 /* Do we already have a mapping for this IOAPIC pin */
1028 if (irq
->dstapic
== dstapic
&& irq
->dstirq
== pin
)
1032 if (idx
!= mp_irq_entries
) {
1033 printk(KERN_DEBUG
"ACPI: IRQ%d used by override.\n", i
);
1034 continue; /* IRQ already used */
1037 mp_irq
.type
= MP_INTSRC
;
1038 mp_irq
.irqflag
= 0; /* Conforming */
1039 mp_irq
.srcbus
= MP_ISA_BUS
;
1040 mp_irq
.dstapic
= dstapic
;
1041 mp_irq
.irqtype
= mp_INT
;
1042 mp_irq
.srcbusirq
= i
; /* Identity mapped */
1043 mp_irq
.dstirq
= pin
;
1045 mp_save_irq(&mp_irq
);
1049 static int mp_config_acpi_gsi(struct device
*dev
, u32 gsi
, int trigger
,
1052 #ifdef CONFIG_X86_MPPARSE
1053 struct mpc_intsrc mp_irq
;
1054 struct pci_dev
*pdev
;
1055 unsigned char number
;
1064 if (dev
->bus
!= &pci_bus_type
)
1067 pdev
= to_pci_dev(dev
);
1068 number
= pdev
->bus
->number
;
1069 devfn
= pdev
->devfn
;
1071 /* print the entry should happen on mptable identically */
1072 mp_irq
.type
= MP_INTSRC
;
1073 mp_irq
.irqtype
= mp_INT
;
1074 mp_irq
.irqflag
= (trigger
== ACPI_EDGE_SENSITIVE
? 4 : 0x0c) |
1075 (polarity
== ACPI_ACTIVE_HIGH
? 1 : 3);
1076 mp_irq
.srcbus
= number
;
1077 mp_irq
.srcbusirq
= (((devfn
>> 3) & 0x1f) << 2) | ((pin
- 1) & 3);
1078 ioapic
= mp_find_ioapic(gsi
);
1079 mp_irq
.dstapic
= mp_ioapics
[ioapic
].apicid
;
1080 mp_irq
.dstirq
= mp_find_ioapic_pin(ioapic
, gsi
);
1082 mp_save_irq(&mp_irq
);
1087 int mp_register_gsi(struct device
*dev
, u32 gsi
, int trigger
, int polarity
)
1091 struct io_apic_irq_attr irq_attr
;
1093 if (acpi_irq_model
!= ACPI_IRQ_MODEL_IOAPIC
)
1096 /* Don't set up the ACPI SCI because it's already set up */
1097 if (acpi_gbl_FADT
.sci_interrupt
== gsi
)
1100 ioapic
= mp_find_ioapic(gsi
);
1102 printk(KERN_WARNING
"No IOAPIC for GSI %u\n", gsi
);
1106 ioapic_pin
= mp_find_ioapic_pin(ioapic
, gsi
);
1108 if (ioapic_pin
> MP_MAX_IOAPIC_PIN
) {
1109 printk(KERN_ERR
"Invalid reference to IOAPIC pin "
1110 "%d-%d\n", mp_ioapics
[ioapic
].apicid
,
1115 if (enable_update_mptable
)
1116 mp_config_acpi_gsi(dev
, gsi
, trigger
, polarity
);
1118 set_io_apic_irq_attr(&irq_attr
, ioapic
, ioapic_pin
,
1119 trigger
== ACPI_EDGE_SENSITIVE
? 0 : 1,
1120 polarity
== ACPI_ACTIVE_HIGH
? 0 : 1);
1121 io_apic_set_pci_routing(dev
, gsi_to_irq(gsi
), &irq_attr
);
1127 * Parse IOAPIC related entries in MADT
1128 * returns 0 on success, < 0 on error
1130 static int __init
acpi_parse_madt_ioapic_entries(void)
1135 * ACPI interpreter is required to complete interrupt setup,
1136 * so if it is off, don't enumerate the io-apics with ACPI.
1137 * If MPS is present, it will handle them,
1138 * otherwise the system will stay in PIC mode
1140 if (acpi_disabled
|| acpi_noirq
)
1147 * if "noapic" boot option, don't look for IO-APICs
1149 if (skip_ioapic_setup
) {
1150 printk(KERN_INFO PREFIX
"Skipping IOAPIC probe "
1151 "due to 'noapic' option.\n");
1156 acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC
, acpi_parse_ioapic
,
1159 printk(KERN_ERR PREFIX
"No IOAPIC entries present\n");
1161 } else if (count
< 0) {
1162 printk(KERN_ERR PREFIX
"Error parsing IOAPIC entry\n");
1167 acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE
, acpi_parse_int_src_ovr
,
1170 printk(KERN_ERR PREFIX
1171 "Error parsing interrupt source overrides entry\n");
1172 /* TBD: Cleanup to allow fallback to MPS */
1177 * If BIOS did not supply an INT_SRC_OVR for the SCI
1178 * pretend we got one so we can set the SCI flags.
1180 if (!acpi_sci_override_gsi
)
1181 acpi_sci_ioapic_setup(acpi_gbl_FADT
.sci_interrupt
, 0, 0,
1182 acpi_gbl_FADT
.sci_interrupt
);
1184 /* Fill in identity legacy mappings where no override */
1185 mp_config_acpi_legacy_irqs();
1188 acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE
, acpi_parse_nmi_src
,
1191 printk(KERN_ERR PREFIX
"Error parsing NMI SRC entry\n");
1192 /* TBD: Cleanup to allow fallback to MPS */
1199 static inline int acpi_parse_madt_ioapic_entries(void)
1203 #endif /* !CONFIG_X86_IO_APIC */
1205 static void __init
early_acpi_process_madt(void)
1207 #ifdef CONFIG_X86_LOCAL_APIC
1210 if (!acpi_table_parse(ACPI_SIG_MADT
, acpi_parse_madt
)) {
1213 * Parse MADT LAPIC entries
1215 error
= early_acpi_parse_madt_lapic_addr_ovr();
1218 smp_found_config
= 1;
1220 if (error
== -EINVAL
) {
1222 * Dell Precision Workstation 410, 610 come here.
1224 printk(KERN_ERR PREFIX
1225 "Invalid BIOS MADT, disabling ACPI\n");
1232 static void __init
acpi_process_madt(void)
1234 #ifdef CONFIG_X86_LOCAL_APIC
1237 if (!acpi_table_parse(ACPI_SIG_MADT
, acpi_parse_madt
)) {
1240 * Parse MADT LAPIC entries
1242 error
= acpi_parse_madt_lapic_entries();
1247 * Parse MADT IO-APIC entries
1249 error
= acpi_parse_madt_ioapic_entries();
1251 acpi_set_irq_model_ioapic();
1253 smp_found_config
= 1;
1256 if (error
== -EINVAL
) {
1258 * Dell Precision Workstation 410, 610 come here.
1260 printk(KERN_ERR PREFIX
1261 "Invalid BIOS MADT, disabling ACPI\n");
1266 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1267 * In the event an MPS table was found, forget it.
1268 * Boot with "acpi=off" to use MPS on such a system.
1270 if (smp_found_config
) {
1271 printk(KERN_WARNING PREFIX
1272 "No APIC-table, disabling MPS\n");
1273 smp_found_config
= 0;
1278 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1279 * processors, where MPS only supports physical.
1281 if (acpi_lapic
&& acpi_ioapic
)
1282 printk(KERN_INFO
"Using ACPI (MADT) for SMP configuration "
1284 else if (acpi_lapic
)
1285 printk(KERN_INFO
"Using ACPI for processor (LAPIC) "
1286 "configuration information\n");
1291 static int __init
disable_acpi_irq(const struct dmi_system_id
*d
)
1294 printk(KERN_NOTICE
"%s detected: force use of acpi=noirq\n",
1301 static int __init
disable_acpi_pci(const struct dmi_system_id
*d
)
1304 printk(KERN_NOTICE
"%s detected: force use of pci=noacpi\n",
1311 static int __init
dmi_disable_acpi(const struct dmi_system_id
*d
)
1314 printk(KERN_NOTICE
"%s detected: acpi off\n", d
->ident
);
1318 "Warning: DMI blacklist says broken, but acpi forced\n");
1324 * Force ignoring BIOS IRQ0 pin2 override
1326 static int __init
dmi_ignore_irq0_timer_override(const struct dmi_system_id
*d
)
1329 * The ati_ixp4x0_rev() early PCI quirk should have set
1330 * the acpi_skip_timer_override flag already:
1332 if (!acpi_skip_timer_override
) {
1333 WARN(1, KERN_ERR
"ati_ixp4x0 quirk not complete.\n");
1334 pr_notice("%s detected: Ignoring BIOS IRQ0 pin2 override\n",
1336 acpi_skip_timer_override
= 1;
1342 * If your system is blacklisted here, but you find that acpi=force
1343 * works for you, please contact linux-acpi@vger.kernel.org
1345 static struct dmi_system_id __initdata acpi_dmi_table
[] = {
1347 * Boxes that need ACPI disabled
1350 .callback
= dmi_disable_acpi
,
1351 .ident
= "IBM Thinkpad",
1353 DMI_MATCH(DMI_BOARD_VENDOR
, "IBM"),
1354 DMI_MATCH(DMI_BOARD_NAME
, "2629H1G"),
1359 * Boxes that need ACPI PCI IRQ routing disabled
1362 .callback
= disable_acpi_irq
,
1363 .ident
= "ASUS A7V",
1365 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC"),
1366 DMI_MATCH(DMI_BOARD_NAME
, "<A7V>"),
1367 /* newer BIOS, Revision 1011, does work */
1368 DMI_MATCH(DMI_BIOS_VERSION
,
1369 "ASUS A7V ACPI BIOS Revision 1007"),
1374 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1375 * for LPC bridge, which is needed for the PCI
1376 * interrupt links to work. DSDT fix is in bug 5966.
1377 * 2645, 2646 model numbers are shared with 600/600E/600X
1379 .callback
= disable_acpi_irq
,
1380 .ident
= "IBM Thinkpad 600 Series 2645",
1382 DMI_MATCH(DMI_BOARD_VENDOR
, "IBM"),
1383 DMI_MATCH(DMI_BOARD_NAME
, "2645"),
1387 .callback
= disable_acpi_irq
,
1388 .ident
= "IBM Thinkpad 600 Series 2646",
1390 DMI_MATCH(DMI_BOARD_VENDOR
, "IBM"),
1391 DMI_MATCH(DMI_BOARD_NAME
, "2646"),
1395 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1398 .callback
= disable_acpi_pci
,
1399 .ident
= "ASUS PR-DLS",
1401 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
1402 DMI_MATCH(DMI_BOARD_NAME
, "PR-DLS"),
1403 DMI_MATCH(DMI_BIOS_VERSION
,
1404 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1405 DMI_MATCH(DMI_BIOS_DATE
, "03/21/2003")
1409 .callback
= disable_acpi_pci
,
1410 .ident
= "Acer TravelMate 36x Laptop",
1412 DMI_MATCH(DMI_SYS_VENDOR
, "Acer"),
1413 DMI_MATCH(DMI_PRODUCT_NAME
, "TravelMate 360"),
1419 /* second table for DMI checks that should run after early-quirks */
1420 static struct dmi_system_id __initdata acpi_dmi_table_late
[] = {
1422 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1423 * which includes some code which overrides all temperature
1424 * trip points to 16C if the INTIN2 input of the I/O APIC
1425 * is enabled. This input is incorrectly designated the
1426 * ISA IRQ 0 via an interrupt source override even though
1427 * it is wired to the output of the master 8259A and INTIN0
1428 * is not connected at all. Force ignoring BIOS IRQ0 pin2
1429 * override in that cases.
1432 .callback
= dmi_ignore_irq0_timer_override
,
1433 .ident
= "HP nx6115 laptop",
1435 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
1436 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Compaq nx6115"),
1440 .callback
= dmi_ignore_irq0_timer_override
,
1441 .ident
= "HP NX6125 laptop",
1443 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
1444 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Compaq nx6125"),
1448 .callback
= dmi_ignore_irq0_timer_override
,
1449 .ident
= "HP NX6325 laptop",
1451 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
1452 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Compaq nx6325"),
1456 .callback
= dmi_ignore_irq0_timer_override
,
1457 .ident
= "HP 6715b laptop",
1459 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
1460 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Compaq 6715b"),
1467 * acpi_boot_table_init() and acpi_boot_init()
1468 * called from setup_arch(), always.
1469 * 1. checksums all tables
1470 * 2. enumerates lapics
1471 * 3. enumerates io-apics
1473 * acpi_table_init() is separate to allow reading SRAT without
1474 * other side effects.
1476 * side effects of acpi_boot_init:
1477 * acpi_lapic = 1 if LAPIC found
1478 * acpi_ioapic = 1 if IOAPIC found
1479 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1480 * if acpi_blacklisted() acpi_disabled = 1;
1481 * acpi_irq_model=...
1485 void __init
acpi_boot_table_init(void)
1487 dmi_check_system(acpi_dmi_table
);
1490 * If acpi_disabled, bail out
1496 * Initialize the ACPI boot-time table parser.
1498 if (acpi_table_init()) {
1503 acpi_table_parse(ACPI_SIG_BOOT
, acpi_parse_sbf
);
1506 * blacklist may disable ACPI entirely
1508 if (acpi_blacklisted()) {
1510 printk(KERN_WARNING PREFIX
"acpi=force override\n");
1512 printk(KERN_WARNING PREFIX
"Disabling ACPI support\n");
1519 int __init
early_acpi_boot_init(void)
1522 * If acpi_disabled, bail out
1528 * Process the Multiple APIC Description Table (MADT), if present
1530 early_acpi_process_madt();
1535 int __init
acpi_boot_init(void)
1537 /* those are executed after early-quirks are executed */
1538 dmi_check_system(acpi_dmi_table_late
);
1541 * If acpi_disabled, bail out
1546 acpi_table_parse(ACPI_SIG_BOOT
, acpi_parse_sbf
);
1549 * set sci_int and PM timer address
1551 acpi_table_parse(ACPI_SIG_FADT
, acpi_parse_fadt
);
1554 * Process the Multiple APIC Description Table (MADT), if present
1556 acpi_process_madt();
1558 acpi_table_parse(ACPI_SIG_HPET
, acpi_parse_hpet
);
1561 x86_init
.pci
.init
= pci_acpi_init
;
1566 static int __init
parse_acpi(char *arg
)
1571 /* "acpi=off" disables both ACPI table parsing and interpreter */
1572 if (strcmp(arg
, "off") == 0) {
1575 /* acpi=force to over-ride black-list */
1576 else if (strcmp(arg
, "force") == 0) {
1580 /* acpi=strict disables out-of-spec workarounds */
1581 else if (strcmp(arg
, "strict") == 0) {
1584 /* acpi=rsdt use RSDT instead of XSDT */
1585 else if (strcmp(arg
, "rsdt") == 0) {
1586 acpi_rsdt_forced
= 1;
1588 /* "acpi=noirq" disables ACPI interrupt routing */
1589 else if (strcmp(arg
, "noirq") == 0) {
1592 /* "acpi=copy_dsdt" copys DSDT */
1593 else if (strcmp(arg
, "copy_dsdt") == 0) {
1594 acpi_gbl_copy_dsdt_locally
= 1;
1596 /* Core will printk when we return error. */
1601 early_param("acpi", parse_acpi
);
1603 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1604 static int __init
parse_pci(char *arg
)
1606 if (arg
&& strcmp(arg
, "noacpi") == 0)
1610 early_param("pci", parse_pci
);
1612 int __init
acpi_mps_check(void)
1614 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1615 /* mptable code is not built-in*/
1616 if (acpi_disabled
|| acpi_noirq
) {
1617 printk(KERN_WARNING
"MPS support code is not built-in.\n"
1618 "Using acpi=off or acpi=noirq or pci=noacpi "
1619 "may have problem\n");
1626 #ifdef CONFIG_X86_IO_APIC
1627 static int __init
parse_acpi_skip_timer_override(char *arg
)
1629 acpi_skip_timer_override
= 1;
1632 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override
);
1634 static int __init
parse_acpi_use_timer_override(char *arg
)
1636 acpi_use_timer_override
= 1;
1639 early_param("acpi_use_timer_override", parse_acpi_use_timer_override
);
1640 #endif /* CONFIG_X86_IO_APIC */
1642 static int __init
setup_acpi_sci(char *s
)
1646 if (!strcmp(s
, "edge"))
1647 acpi_sci_flags
= ACPI_MADT_TRIGGER_EDGE
|
1648 (acpi_sci_flags
& ~ACPI_MADT_TRIGGER_MASK
);
1649 else if (!strcmp(s
, "level"))
1650 acpi_sci_flags
= ACPI_MADT_TRIGGER_LEVEL
|
1651 (acpi_sci_flags
& ~ACPI_MADT_TRIGGER_MASK
);
1652 else if (!strcmp(s
, "high"))
1653 acpi_sci_flags
= ACPI_MADT_POLARITY_ACTIVE_HIGH
|
1654 (acpi_sci_flags
& ~ACPI_MADT_POLARITY_MASK
);
1655 else if (!strcmp(s
, "low"))
1656 acpi_sci_flags
= ACPI_MADT_POLARITY_ACTIVE_LOW
|
1657 (acpi_sci_flags
& ~ACPI_MADT_POLARITY_MASK
);
1662 early_param("acpi_sci", setup_acpi_sci
);
1664 int __acpi_acquire_global_lock(unsigned int *lock
)
1666 unsigned int old
, new, val
;
1669 new = (((old
& ~0x3) + 2) + ((old
>> 1) & 0x1));
1670 val
= cmpxchg(lock
, old
, new);
1671 } while (unlikely (val
!= old
));
1672 return (new < 3) ? -1 : 0;
1675 int __acpi_release_global_lock(unsigned int *lock
)
1677 unsigned int old
, new, val
;
1681 val
= cmpxchg(lock
, old
, new);
1682 } while (unlikely (val
!= old
));