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/bootmem.h>
35 #include <linux/ioport.h>
37 #include <asm/pgtable.h>
38 #include <asm/io_apic.h>
41 #include <asm/mpspec.h>
44 #ifdef CONFIG_X86_LOCAL_APIC
45 # include <mach_apic.h>
48 static int __initdata acpi_force = 0;
51 int acpi_disabled = 0;
53 int acpi_disabled = 1;
55 EXPORT_SYMBOL(acpi_disabled);
59 #include <asm/proto.h>
60 #include <asm/genapic.h>
64 #ifdef CONFIG_X86_LOCAL_APIC
65 #include <mach_apic.h>
66 #include <mach_mpparse.h>
67 #endif /* CONFIG_X86_LOCAL_APIC */
71 #define BAD_MADT_ENTRY(entry, end) ( \
72 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
73 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
75 #define PREFIX "ACPI: "
77 int acpi_noirq; /* skip ACPI IRQ initialization */
78 int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
79 EXPORT_SYMBOL(acpi_pci_disabled);
80 int acpi_ht __initdata = 1; /* enable HT */
86 u8 acpi_sci_flags __initdata;
87 int acpi_sci_override_gsi __initdata;
88 int acpi_skip_timer_override __initdata;
89 int acpi_use_timer_override __initdata;
91 #ifdef CONFIG_X86_LOCAL_APIC
92 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
95 #ifndef __HAVE_ARCH_CMPXCHG
96 #warning ACPI uses CMPXCHG, i486 and later hardware
99 /* --------------------------------------------------------------------------
100 Boot-time Configuration
101 -------------------------------------------------------------------------- */
104 * The default interrupt routing model is PIC (8259). This gets
105 * overridden if IOAPICs are enumerated (below).
107 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
111 /* rely on all ACPI tables being in the direct mapping */
112 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
114 if (!phys_addr || !size)
117 if (phys_addr+size <= (max_pfn_mapped << PAGE_SHIFT) + PAGE_SIZE)
118 return __va(phys_addr);
126 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
127 * to map the target physical address. The problem is that set_fixmap()
128 * provides a single page, and it is possible that the page is not
130 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
131 * i.e. until the next __va_range() call.
133 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
134 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
135 * count idx down while incrementing the phys address.
137 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
139 unsigned long base, offset, mapped_size;
142 if (phys + size < 8 * 1024 * 1024)
145 offset = phys & (PAGE_SIZE - 1);
146 mapped_size = PAGE_SIZE - offset;
147 set_fixmap(FIX_ACPI_END, phys);
148 base = fix_to_virt(FIX_ACPI_END);
151 * Most cases can be covered by the below.
154 while (mapped_size < size) {
155 if (--idx < FIX_ACPI_BEGIN)
156 return NULL; /* cannot handle this */
158 set_fixmap(idx, phys);
159 mapped_size += PAGE_SIZE;
162 return ((unsigned char *)base + offset);
166 #ifdef CONFIG_PCI_MMCONFIG
167 /* The physical address of the MMCONFIG aperture. Set from ACPI tables. */
168 struct acpi_mcfg_allocation *pci_mmcfg_config;
169 int pci_mmcfg_config_num;
171 int __init acpi_parse_mcfg(struct acpi_table_header *header)
173 struct acpi_table_mcfg *mcfg;
180 mcfg = (struct acpi_table_mcfg *)header;
182 /* how many config structures do we have */
183 pci_mmcfg_config_num = 0;
184 i = header->length - sizeof(struct acpi_table_mcfg);
185 while (i >= sizeof(struct acpi_mcfg_allocation)) {
186 ++pci_mmcfg_config_num;
187 i -= sizeof(struct acpi_mcfg_allocation);
189 if (pci_mmcfg_config_num == 0) {
190 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
194 config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
195 pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
196 if (!pci_mmcfg_config) {
197 printk(KERN_WARNING PREFIX
198 "No memory for MCFG config tables\n");
202 memcpy(pci_mmcfg_config, &mcfg[1], config_size);
203 for (i = 0; i < pci_mmcfg_config_num; ++i) {
204 if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
205 printk(KERN_ERR PREFIX
206 "MMCONFIG not in low 4GB of memory\n");
207 kfree(pci_mmcfg_config);
208 pci_mmcfg_config_num = 0;
215 #endif /* CONFIG_PCI_MMCONFIG */
217 #ifdef CONFIG_X86_LOCAL_APIC
218 static int __init acpi_parse_madt(struct acpi_table_header *table)
220 struct acpi_table_madt *madt = NULL;
225 madt = (struct acpi_table_madt *)table;
227 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
232 acpi_lapic_addr = (u64) madt->address;
234 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
238 acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
243 static void __cpuinit acpi_register_lapic(int id, u8 enabled)
250 generic_processor_info(id, 0);
254 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
256 struct acpi_madt_local_apic *processor = NULL;
258 processor = (struct acpi_madt_local_apic *)header;
260 if (BAD_MADT_ENTRY(processor, end))
263 acpi_table_print_madt_entry(header);
266 * We need to register disabled CPU as well to permit
267 * counting disabled CPUs. This allows us to size
268 * cpus_possible_map more accurately, to permit
269 * to not preallocating memory for all NR_CPUS
270 * when we use CPU hotplug.
272 acpi_register_lapic(processor->id, /* APIC ID */
273 processor->lapic_flags & ACPI_MADT_ENABLED);
279 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
281 struct acpi_madt_local_sapic *processor = NULL;
283 processor = (struct acpi_madt_local_sapic *)header;
285 if (BAD_MADT_ENTRY(processor, end))
288 acpi_table_print_madt_entry(header);
290 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
291 processor->lapic_flags & ACPI_MADT_ENABLED);
297 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
298 const unsigned long end)
300 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
302 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
304 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
307 acpi_lapic_addr = lapic_addr_ovr->address;
313 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
315 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
317 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
319 if (BAD_MADT_ENTRY(lapic_nmi, end))
322 acpi_table_print_madt_entry(header);
324 if (lapic_nmi->lint != 1)
325 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
330 #endif /*CONFIG_X86_LOCAL_APIC */
332 #ifdef CONFIG_X86_IO_APIC
335 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
337 struct acpi_madt_io_apic *ioapic = NULL;
339 ioapic = (struct acpi_madt_io_apic *)header;
341 if (BAD_MADT_ENTRY(ioapic, end))
344 acpi_table_print_madt_entry(header);
346 mp_register_ioapic(ioapic->id,
347 ioapic->address, ioapic->global_irq_base);
353 * Parse Interrupt Source Override for the ACPI SCI
355 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
357 if (trigger == 0) /* compatible SCI trigger is level */
360 if (polarity == 0) /* compatible SCI polarity is low */
363 /* Command-line over-ride via acpi_sci= */
364 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
365 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
367 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
368 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
371 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
372 * If GSI is < 16, this will update its flags,
373 * else it will create a new mp_irqs[] entry.
375 mp_override_legacy_irq(gsi, polarity, trigger, gsi);
378 * stash over-ride to indicate we've been here
379 * and for later update of acpi_gbl_FADT
381 acpi_sci_override_gsi = gsi;
386 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
387 const unsigned long end)
389 struct acpi_madt_interrupt_override *intsrc = NULL;
391 intsrc = (struct acpi_madt_interrupt_override *)header;
393 if (BAD_MADT_ENTRY(intsrc, end))
396 acpi_table_print_madt_entry(header);
398 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
399 acpi_sci_ioapic_setup(intsrc->global_irq,
400 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
401 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
405 if (acpi_skip_timer_override &&
406 intsrc->source_irq == 0 && intsrc->global_irq == 2) {
407 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
411 mp_override_legacy_irq(intsrc->source_irq,
412 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
413 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
420 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
422 struct acpi_madt_nmi_source *nmi_src = NULL;
424 nmi_src = (struct acpi_madt_nmi_source *)header;
426 if (BAD_MADT_ENTRY(nmi_src, end))
429 acpi_table_print_madt_entry(header);
431 /* TBD: Support nimsrc entries? */
436 #endif /* CONFIG_X86_IO_APIC */
439 * acpi_pic_sci_set_trigger()
441 * use ELCR to set PIC-mode trigger type for SCI
443 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
444 * it may require Edge Trigger -- use "acpi_sci=edge"
446 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
447 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
448 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
449 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
452 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
454 unsigned int mask = 1 << irq;
455 unsigned int old, new;
457 /* Real old ELCR mask */
458 old = inb(0x4d0) | (inb(0x4d1) << 8);
461 * If we use ACPI to set PCI IRQs, then we should clear ELCR
462 * since we will set it correctly as we enable the PCI irq
465 new = acpi_noirq ? old : 0;
468 * Update SCI information in the ELCR, it isn't in the PCI
472 case 1: /* Edge - clear */
475 case 3: /* Level - set */
483 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
485 outb(new >> 8, 0x4d1);
488 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
495 * success: return IRQ number (>=0)
496 * failure: return < 0
498 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
501 unsigned int plat_gsi = gsi;
505 * Make sure all (legacy) PCI IRQs are set as level-triggered.
507 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
508 extern void eisa_set_level_irq(unsigned int irq);
510 if (triggering == ACPI_LEVEL_SENSITIVE)
511 eisa_set_level_irq(gsi);
515 #ifdef CONFIG_X86_IO_APIC
516 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
517 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
520 acpi_gsi_to_irq(plat_gsi, &irq);
525 * ACPI based hotplug support for CPU
527 #ifdef CONFIG_ACPI_HOTPLUG_CPU
529 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
531 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
532 union acpi_object *obj;
533 struct acpi_madt_local_apic *lapic;
534 cpumask_t tmp_map, new_map;
538 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
541 if (!buffer.length || !buffer.pointer)
544 obj = buffer.pointer;
545 if (obj->type != ACPI_TYPE_BUFFER ||
546 obj->buffer.length < sizeof(*lapic)) {
547 kfree(buffer.pointer);
551 lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
553 if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
554 !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
555 kfree(buffer.pointer);
561 kfree(buffer.pointer);
562 buffer.length = ACPI_ALLOCATE_BUFFER;
563 buffer.pointer = NULL;
565 tmp_map = cpu_present_map;
566 acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
569 * If mp_register_lapic successfully generates a new logical cpu
570 * number, then the following will get us exactly what was mapped
572 cpus_andnot(new_map, cpu_present_map, tmp_map);
573 if (cpus_empty(new_map)) {
574 printk ("Unable to map lapic to logical cpu number\n");
578 cpu = first_cpu(new_map);
584 /* wrapper to silence section mismatch warning */
585 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
587 return _acpi_map_lsapic(handle, pcpu);
589 EXPORT_SYMBOL(acpi_map_lsapic);
591 int acpi_unmap_lsapic(int cpu)
593 per_cpu(x86_cpu_to_apicid, cpu) = -1;
594 cpu_clear(cpu, cpu_present_map);
600 EXPORT_SYMBOL(acpi_unmap_lsapic);
601 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
603 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
609 EXPORT_SYMBOL(acpi_register_ioapic);
611 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
617 EXPORT_SYMBOL(acpi_unregister_ioapic);
619 static int __init acpi_parse_sbf(struct acpi_table_header *table)
621 struct acpi_table_boot *sb;
623 sb = (struct acpi_table_boot *)table;
625 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
629 sbf_port = sb->cmos_index; /* Save CMOS port */
634 #ifdef CONFIG_HPET_TIMER
635 #include <asm/hpet.h>
637 static struct __initdata resource *hpet_res;
639 static int __init acpi_parse_hpet(struct acpi_table_header *table)
641 struct acpi_table_hpet *hpet_tbl;
643 hpet_tbl = (struct acpi_table_hpet *)table;
645 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
649 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
650 printk(KERN_WARNING PREFIX "HPET timers must be located in "
655 hpet_address = hpet_tbl->address.address;
658 * Some broken BIOSes advertise HPET at 0x0. We really do not
659 * want to allocate a resource there.
662 printk(KERN_WARNING PREFIX
663 "HPET id: %#x base: %#lx is invalid\n",
664 hpet_tbl->id, hpet_address);
669 * Some even more broken BIOSes advertise HPET at
670 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
673 if (hpet_address == 0xfed0000000000000UL) {
674 if (!hpet_force_user) {
675 printk(KERN_WARNING PREFIX "HPET id: %#x "
676 "base: 0xfed0000000000000 is bogus\n "
677 "try hpet=force on the kernel command line to "
678 "fix it up to 0xfed00000.\n", hpet_tbl->id);
682 printk(KERN_WARNING PREFIX
683 "HPET id: %#x base: 0xfed0000000000000 fixed up "
684 "to 0xfed00000.\n", hpet_tbl->id);
688 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
689 hpet_tbl->id, hpet_address);
692 * Allocate and initialize the HPET firmware resource for adding into
693 * the resource tree during the lateinit timeframe.
695 #define HPET_RESOURCE_NAME_SIZE 9
696 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
698 hpet_res->name = (void *)&hpet_res[1];
699 hpet_res->flags = IORESOURCE_MEM;
700 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
703 hpet_res->start = hpet_address;
704 hpet_res->end = hpet_address + (1 * 1024) - 1;
710 * hpet_insert_resource inserts the HPET resources used into the resource
713 static __init int hpet_insert_resource(void)
718 return insert_resource(&iomem_resource, hpet_res);
721 late_initcall(hpet_insert_resource);
724 #define acpi_parse_hpet NULL
727 static int __init acpi_parse_fadt(struct acpi_table_header *table)
730 #ifdef CONFIG_X86_PM_TIMER
731 /* detect the location of the ACPI PM Timer */
732 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
734 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
735 ACPI_ADR_SPACE_SYSTEM_IO)
738 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
740 * "X" fields are optional extensions to the original V1.0
741 * fields, so we must selectively expand V1.0 fields if the
742 * corresponding X field is zero.
745 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
748 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
751 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
757 #ifdef CONFIG_X86_LOCAL_APIC
759 * Parse LAPIC entries in MADT
760 * returns 0 on success, < 0 on error
763 static void __init acpi_register_lapic_address(unsigned long address)
765 mp_lapic_addr = address;
767 set_fixmap_nocache(FIX_APIC_BASE, address);
768 if (boot_cpu_physical_apicid == -1U)
769 boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
772 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
780 * Note that the LAPIC address is obtained from the MADT (32-bit value)
781 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
785 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
786 acpi_parse_lapic_addr_ovr, 0);
788 printk(KERN_ERR PREFIX
789 "Error parsing LAPIC address override entry\n");
793 acpi_register_lapic_address(acpi_lapic_addr);
798 static int __init acpi_parse_madt_lapic_entries(void)
806 * Note that the LAPIC address is obtained from the MADT (32-bit value)
807 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
811 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
812 acpi_parse_lapic_addr_ovr, 0);
814 printk(KERN_ERR PREFIX
815 "Error parsing LAPIC address override entry\n");
819 acpi_register_lapic_address(acpi_lapic_addr);
821 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
822 acpi_parse_sapic, MAX_APICS);
825 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
826 acpi_parse_lapic, MAX_APICS);
828 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
829 /* TBD: Cleanup to allow fallback to MPS */
831 } else if (count < 0) {
832 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
833 /* TBD: Cleanup to allow fallback to MPS */
838 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
840 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
841 /* TBD: Cleanup to allow fallback to MPS */
846 #endif /* CONFIG_X86_LOCAL_APIC */
848 #ifdef CONFIG_X86_IO_APIC
851 #if defined(CONFIG_X86_ES7000) || defined(CONFIG_X86_GENERICARCH)
852 extern int es7000_plat;
859 DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
860 } mp_ioapic_routing[MAX_IO_APICS];
862 static int mp_find_ioapic(int gsi)
866 /* Find the IOAPIC that manages this GSI. */
867 for (i = 0; i < nr_ioapics; i++) {
868 if ((gsi >= mp_ioapic_routing[i].gsi_base)
869 && (gsi <= mp_ioapic_routing[i].gsi_end))
873 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
877 static u8 __init uniq_ioapic_id(u8 id)
880 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
881 !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
882 return io_apic_get_unique_id(nr_ioapics, id);
887 DECLARE_BITMAP(used, 256);
888 bitmap_zero(used, 256);
889 for (i = 0; i < nr_ioapics; i++) {
890 struct mpc_config_ioapic *ia = &mp_ioapics[i];
891 __set_bit(ia->mpc_apicid, used);
893 if (!test_bit(id, used))
895 return find_first_zero_bit(used, 256);
899 static int bad_ioapic(unsigned long address)
901 if (nr_ioapics >= MAX_IO_APICS) {
902 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
903 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
904 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
907 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
908 " found in table, skipping!\n");
914 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
918 if (bad_ioapic(address))
923 mp_ioapics[idx].mpc_type = MP_IOAPIC;
924 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
925 mp_ioapics[idx].mpc_apicaddr = address;
927 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
928 mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
930 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
932 mp_ioapics[idx].mpc_apicver = 0;
935 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
936 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
938 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
939 mp_ioapic_routing[idx].gsi_base = gsi_base;
940 mp_ioapic_routing[idx].gsi_end = gsi_base +
941 io_apic_get_redir_entries(idx);
943 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
944 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
945 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
946 mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end);
951 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
957 * Convert 'gsi' to 'ioapic.pin'.
959 ioapic = mp_find_ioapic(gsi);
962 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
965 * TBD: This check is for faulty timer entries, where the override
966 * erroneously sets the trigger to level, resulting in a HUGE
967 * increase of timer interrupts!
969 if ((bus_irq == 0) && (trigger == 3))
972 mp_irqs[mp_irq_entries].mpc_type = MP_INTSRC;
973 mp_irqs[mp_irq_entries].mpc_irqtype = mp_INT;
974 mp_irqs[mp_irq_entries].mpc_irqflag = (trigger << 2) | polarity;
975 mp_irqs[mp_irq_entries].mpc_srcbus = MP_ISA_BUS;
976 mp_irqs[mp_irq_entries].mpc_srcbusirq = bus_irq; /* IRQ */
977 mp_irqs[mp_irq_entries].mpc_dstapic =
978 mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
979 mp_irqs[mp_irq_entries].mpc_dstirq = pin; /* INTIN# */
981 if (++mp_irq_entries == MAX_IRQ_SOURCES)
982 panic("Max # of irq sources exceeded!!\n");
986 void __init mp_config_acpi_legacy_irqs(void)
991 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
993 * Fabricate the legacy ISA bus (bus #31).
995 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
997 set_bit(MP_ISA_BUS, mp_bus_not_pci);
998 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
1000 #if defined(CONFIG_X86_ES7000) || defined(CONFIG_X86_GENERICARCH)
1002 * Older generations of ES7000 have no legacy identity mappings
1004 if (es7000_plat == 1)
1009 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1011 ioapic = mp_find_ioapic(0);
1015 mp_irqs[mp_irq_entries].mpc_type = MP_INTSRC;
1016 mp_irqs[mp_irq_entries].mpc_irqflag = 0; /* Conforming */
1017 mp_irqs[mp_irq_entries].mpc_srcbus = MP_ISA_BUS;
1018 #ifdef CONFIG_X86_IO_APIC
1019 mp_irqs[mp_irq_entries].mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
1022 * Use the default configuration for the IRQs 0-15. Unless
1023 * overridden by (MADT) interrupt source override entries.
1025 for (i = 0; i < 16; i++) {
1028 for (idx = 0; idx < mp_irq_entries; idx++) {
1029 struct mpc_config_intsrc *irq = mp_irqs + idx;
1031 /* Do we already have a mapping for this ISA IRQ? */
1032 if (irq->mpc_srcbus == MP_ISA_BUS
1033 && irq->mpc_srcbusirq == i)
1036 /* Do we already have a mapping for this IOAPIC pin */
1037 if ((irq->mpc_dstapic ==
1038 mp_irqs[mp_irq_entries].mpc_dstapic) &&
1039 (irq->mpc_dstirq == i))
1043 if (idx != mp_irq_entries) {
1044 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1045 continue; /* IRQ already used */
1048 mp_irqs[mp_irq_entries].mpc_irqtype = mp_INT;
1049 mp_irqs[mp_irq_entries].mpc_srcbusirq = i; /* Identity mapped */
1050 mp_irqs[mp_irq_entries].mpc_dstirq = i;
1052 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1053 panic("Max # of irq sources exceeded!!\n");
1057 int mp_register_gsi(u32 gsi, int triggering, int polarity)
1061 #ifdef CONFIG_X86_32
1062 #define MAX_GSI_NUM 4096
1063 #define IRQ_COMPRESSION_START 64
1065 static int pci_irq = IRQ_COMPRESSION_START;
1067 * Mapping between Global System Interrupts, which
1068 * represent all possible interrupts, and IRQs
1069 * assigned to actual devices.
1071 static int gsi_to_irq[MAX_GSI_NUM];
1074 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
1078 /* Don't set up the ACPI SCI because it's already set up */
1079 if (acpi_gbl_FADT.sci_interrupt == gsi)
1082 ioapic = mp_find_ioapic(gsi);
1084 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1088 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1090 #ifdef CONFIG_X86_32
1091 if (ioapic_renumber_irq)
1092 gsi = ioapic_renumber_irq(ioapic, gsi);
1096 * Avoid pin reprogramming. PRTs typically include entries
1097 * with redundant pin->gsi mappings (but unique PCI devices);
1098 * we only program the IOAPIC on the first.
1100 if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
1101 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1102 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1106 if (test_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed)) {
1107 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1108 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1109 #ifdef CONFIG_X86_32
1110 return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]);
1116 set_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed);
1117 #ifdef CONFIG_X86_32
1119 * For GSI >= 64, use IRQ compression
1121 if ((gsi >= IRQ_COMPRESSION_START)
1122 && (triggering == ACPI_LEVEL_SENSITIVE)) {
1124 * For PCI devices assign IRQs in order, avoiding gaps
1125 * due to unused I/O APIC pins.
1128 if (gsi < MAX_GSI_NUM) {
1130 * Retain the VIA chipset work-around (gsi > 15), but
1131 * avoid a problem where the 8254 timer (IRQ0) is setup
1132 * via an override (so it's not on pin 0 of the ioapic),
1133 * and at the same time, the pin 0 interrupt is a PCI
1134 * type. The gsi > 15 test could cause these two pins
1135 * to be shared as IRQ0, and they are not shareable.
1136 * So test for this condition, and if necessary, avoid
1137 * the pin collision.
1141 * Don't assign IRQ used by ACPI SCI
1143 if (gsi == acpi_gbl_FADT.sci_interrupt)
1145 gsi_to_irq[irq] = gsi;
1147 printk(KERN_ERR "GSI %u is too high\n", gsi);
1152 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1153 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
1154 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1159 * Parse IOAPIC related entries in MADT
1160 * returns 0 on success, < 0 on error
1162 static int __init acpi_parse_madt_ioapic_entries(void)
1167 * ACPI interpreter is required to complete interrupt setup,
1168 * so if it is off, don't enumerate the io-apics with ACPI.
1169 * If MPS is present, it will handle them,
1170 * otherwise the system will stay in PIC mode
1172 if (acpi_disabled || acpi_noirq) {
1180 * if "noapic" boot option, don't look for IO-APICs
1182 if (skip_ioapic_setup) {
1183 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1184 "due to 'noapic' option.\n");
1189 acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1192 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1194 } else if (count < 0) {
1195 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1200 acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
1203 printk(KERN_ERR PREFIX
1204 "Error parsing interrupt source overrides entry\n");
1205 /* TBD: Cleanup to allow fallback to MPS */
1210 * If BIOS did not supply an INT_SRC_OVR for the SCI
1211 * pretend we got one so we can set the SCI flags.
1213 if (!acpi_sci_override_gsi)
1214 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
1216 /* Fill in identity legacy mapings where no override */
1217 mp_config_acpi_legacy_irqs();
1220 acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
1223 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1224 /* TBD: Cleanup to allow fallback to MPS */
1231 static inline int acpi_parse_madt_ioapic_entries(void)
1235 #endif /* !CONFIG_X86_IO_APIC */
1237 static void __init early_acpi_process_madt(void)
1239 #ifdef CONFIG_X86_LOCAL_APIC
1242 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1245 * Parse MADT LAPIC entries
1247 error = early_acpi_parse_madt_lapic_addr_ovr();
1250 smp_found_config = 1;
1252 if (error == -EINVAL) {
1254 * Dell Precision Workstation 410, 610 come here.
1256 printk(KERN_ERR PREFIX
1257 "Invalid BIOS MADT, disabling ACPI\n");
1264 static void __init acpi_process_madt(void)
1266 #ifdef CONFIG_X86_LOCAL_APIC
1269 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1272 * Parse MADT LAPIC entries
1274 error = acpi_parse_madt_lapic_entries();
1278 #ifdef CONFIG_X86_GENERICARCH
1279 generic_bigsmp_probe();
1282 * Parse MADT IO-APIC entries
1284 error = acpi_parse_madt_ioapic_entries();
1286 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
1287 acpi_irq_balance_set(NULL);
1290 smp_found_config = 1;
1291 setup_apic_routing();
1294 if (error == -EINVAL) {
1296 * Dell Precision Workstation 410, 610 come here.
1298 printk(KERN_ERR PREFIX
1299 "Invalid BIOS MADT, disabling ACPI\n");
1309 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1312 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1319 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1322 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1329 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1332 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1336 "Warning: DMI blacklist says broken, but acpi forced\n");
1342 * Limit ACPI to CPU enumeration for HT
1344 static int __init force_acpi_ht(const struct dmi_system_id *d)
1347 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
1353 "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
1359 * If your system is blacklisted here, but you find that acpi=force
1360 * works for you, please contact acpi-devel@sourceforge.net
1362 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1364 * Boxes that need ACPI disabled
1367 .callback = dmi_disable_acpi,
1368 .ident = "IBM Thinkpad",
1370 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1371 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1376 * Boxes that need acpi=ht
1379 .callback = force_acpi_ht,
1380 .ident = "FSC Primergy T850",
1382 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1383 DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1387 .callback = force_acpi_ht,
1388 .ident = "HP VISUALIZE NT Workstation",
1390 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1391 DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1395 .callback = force_acpi_ht,
1396 .ident = "Compaq Workstation W8000",
1398 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1399 DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1403 .callback = force_acpi_ht,
1404 .ident = "ASUS P4B266",
1406 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1407 DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1411 .callback = force_acpi_ht,
1412 .ident = "ASUS P2B-DS",
1414 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1415 DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1419 .callback = force_acpi_ht,
1420 .ident = "ASUS CUR-DLS",
1422 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1423 DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1427 .callback = force_acpi_ht,
1428 .ident = "ABIT i440BX-W83977",
1430 DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1431 DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1435 .callback = force_acpi_ht,
1436 .ident = "IBM Bladecenter",
1438 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1439 DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1443 .callback = force_acpi_ht,
1444 .ident = "IBM eServer xSeries 360",
1446 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1447 DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1451 .callback = force_acpi_ht,
1452 .ident = "IBM eserver xSeries 330",
1454 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1455 DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1459 .callback = force_acpi_ht,
1460 .ident = "IBM eserver xSeries 440",
1462 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1463 DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1468 * Boxes that need ACPI PCI IRQ routing disabled
1471 .callback = disable_acpi_irq,
1472 .ident = "ASUS A7V",
1474 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1475 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1476 /* newer BIOS, Revision 1011, does work */
1477 DMI_MATCH(DMI_BIOS_VERSION,
1478 "ASUS A7V ACPI BIOS Revision 1007"),
1483 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1484 * for LPC bridge, which is needed for the PCI
1485 * interrupt links to work. DSDT fix is in bug 5966.
1486 * 2645, 2646 model numbers are shared with 600/600E/600X
1488 .callback = disable_acpi_irq,
1489 .ident = "IBM Thinkpad 600 Series 2645",
1491 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1492 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1496 .callback = disable_acpi_irq,
1497 .ident = "IBM Thinkpad 600 Series 2646",
1499 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1500 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1504 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1507 .callback = disable_acpi_pci,
1508 .ident = "ASUS PR-DLS",
1510 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1511 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1512 DMI_MATCH(DMI_BIOS_VERSION,
1513 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1514 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1518 .callback = disable_acpi_pci,
1519 .ident = "Acer TravelMate 36x Laptop",
1521 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1522 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1528 #endif /* __i386__ */
1531 * acpi_boot_table_init() and acpi_boot_init()
1532 * called from setup_arch(), always.
1533 * 1. checksums all tables
1534 * 2. enumerates lapics
1535 * 3. enumerates io-apics
1537 * acpi_table_init() is separate to allow reading SRAT without
1538 * other side effects.
1540 * side effects of acpi_boot_init:
1541 * acpi_lapic = 1 if LAPIC found
1542 * acpi_ioapic = 1 if IOAPIC found
1543 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1544 * if acpi_blacklisted() acpi_disabled = 1;
1545 * acpi_irq_model=...
1548 * return value: (currently ignored)
1553 int __init acpi_boot_table_init(void)
1558 dmi_check_system(acpi_dmi_table);
1562 * If acpi_disabled, bail out
1563 * One exception: acpi=ht continues far enough to enumerate LAPICs
1565 if (acpi_disabled && !acpi_ht)
1569 * Initialize the ACPI boot-time table parser.
1571 error = acpi_table_init();
1577 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1580 * blacklist may disable ACPI entirely
1582 error = acpi_blacklisted();
1585 printk(KERN_WARNING PREFIX "acpi=force override\n");
1587 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1596 int __init early_acpi_boot_init(void)
1599 * If acpi_disabled, bail out
1600 * One exception: acpi=ht continues far enough to enumerate LAPICs
1602 if (acpi_disabled && !acpi_ht)
1606 * Process the Multiple APIC Description Table (MADT), if present
1608 early_acpi_process_madt();
1613 int __init acpi_boot_init(void)
1616 * If acpi_disabled, bail out
1617 * One exception: acpi=ht continues far enough to enumerate LAPICs
1619 if (acpi_disabled && !acpi_ht)
1622 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1625 * set sci_int and PM timer address
1627 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1630 * Process the Multiple APIC Description Table (MADT), if present
1632 acpi_process_madt();
1634 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1639 static int __init parse_acpi(char *arg)
1644 /* "acpi=off" disables both ACPI table parsing and interpreter */
1645 if (strcmp(arg, "off") == 0) {
1648 /* acpi=force to over-ride black-list */
1649 else if (strcmp(arg, "force") == 0) {
1654 /* acpi=strict disables out-of-spec workarounds */
1655 else if (strcmp(arg, "strict") == 0) {
1658 /* Limit ACPI just to boot-time to enable HT */
1659 else if (strcmp(arg, "ht") == 0) {
1664 /* "acpi=noirq" disables ACPI interrupt routing */
1665 else if (strcmp(arg, "noirq") == 0) {
1668 /* Core will printk when we return error. */
1673 early_param("acpi", parse_acpi);
1675 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1676 static int __init parse_pci(char *arg)
1678 if (arg && strcmp(arg, "noacpi") == 0)
1682 early_param("pci", parse_pci);
1684 #ifdef CONFIG_X86_IO_APIC
1685 static int __init parse_acpi_skip_timer_override(char *arg)
1687 acpi_skip_timer_override = 1;
1690 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1692 static int __init parse_acpi_use_timer_override(char *arg)
1694 acpi_use_timer_override = 1;
1697 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1698 #endif /* CONFIG_X86_IO_APIC */
1700 static int __init setup_acpi_sci(char *s)
1704 if (!strcmp(s, "edge"))
1705 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1706 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1707 else if (!strcmp(s, "level"))
1708 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1709 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1710 else if (!strcmp(s, "high"))
1711 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1712 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1713 else if (!strcmp(s, "low"))
1714 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1715 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1720 early_param("acpi_sci", setup_acpi_sci);
1722 int __acpi_acquire_global_lock(unsigned int *lock)
1724 unsigned int old, new, val;
1727 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1728 val = cmpxchg(lock, old, new);
1729 } while (unlikely (val != old));
1730 return (new < 3) ? -1 : 0;
1733 int __acpi_release_global_lock(unsigned int *lock)
1735 unsigned int old, new, val;
1739 val = cmpxchg(lock, old, new);
1740 } while (unlikely (val != old));