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>
36 #include <linux/pci.h>
38 #include <asm/pgtable.h>
39 #include <asm/io_apic.h>
42 #include <asm/mpspec.h>
45 static int __initdata acpi_force = 0;
48 EXPORT_SYMBOL(acpi_disabled);
51 # include <asm/proto.h>
54 #define BAD_MADT_ENTRY(entry, end) ( \
55 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
56 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
58 #define PREFIX "ACPI: "
60 int acpi_noirq; /* skip ACPI IRQ initialization */
61 int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
62 EXPORT_SYMBOL(acpi_pci_disabled);
63 int acpi_ht __initdata = 1; /* enable HT */
69 u8 acpi_sci_flags __initdata;
70 int acpi_sci_override_gsi __initdata;
71 int acpi_skip_timer_override __initdata;
72 int acpi_use_timer_override __initdata;
74 #ifdef CONFIG_X86_LOCAL_APIC
75 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
78 #ifndef __HAVE_ARCH_CMPXCHG
79 #warning ACPI uses CMPXCHG, i486 and later hardware
82 /* --------------------------------------------------------------------------
83 Boot-time Configuration
84 -------------------------------------------------------------------------- */
87 * The default interrupt routing model is PIC (8259). This gets
88 * overridden if IOAPICs are enumerated (below).
90 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
94 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
95 * to map the target physical address. The problem is that set_fixmap()
96 * provides a single page, and it is possible that the page is not
98 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
99 * i.e. until the next __va_range() call.
101 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
102 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
103 * count idx down while incrementing the phys address.
105 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
111 return early_ioremap(phys, size);
113 void __init __acpi_unmap_table(char *map, unsigned long size)
118 early_iounmap(map, size);
121 #ifdef CONFIG_X86_LOCAL_APIC
122 static int __init acpi_parse_madt(struct acpi_table_header *table)
124 struct acpi_table_madt *madt = NULL;
129 madt = (struct acpi_table_madt *)table;
131 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
136 acpi_lapic_addr = (u64) madt->address;
138 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
142 default_acpi_madt_oem_check(madt->header.oem_id,
143 madt->header.oem_table_id);
148 static void __cpuinit acpi_register_lapic(int id, u8 enabled)
150 unsigned int ver = 0;
157 if (boot_cpu_physical_apicid != -1U)
158 ver = apic_version[boot_cpu_physical_apicid];
160 generic_processor_info(id, ver);
164 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
166 struct acpi_madt_local_x2apic *processor = NULL;
168 processor = (struct acpi_madt_local_x2apic *)header;
170 if (BAD_MADT_ENTRY(processor, end))
173 acpi_table_print_madt_entry(header);
175 #ifdef CONFIG_X86_X2APIC
177 * We need to register disabled CPU as well to permit
178 * counting disabled CPUs. This allows us to size
179 * cpus_possible_map more accurately, to permit
180 * to not preallocating memory for all NR_CPUS
181 * when we use CPU hotplug.
183 acpi_register_lapic(processor->local_apic_id, /* APIC ID */
184 processor->lapic_flags & ACPI_MADT_ENABLED);
186 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
193 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
195 struct acpi_madt_local_apic *processor = NULL;
197 processor = (struct acpi_madt_local_apic *)header;
199 if (BAD_MADT_ENTRY(processor, end))
202 acpi_table_print_madt_entry(header);
205 * We need to register disabled CPU as well to permit
206 * counting disabled CPUs. This allows us to size
207 * cpus_possible_map more accurately, to permit
208 * to not preallocating memory for all NR_CPUS
209 * when we use CPU hotplug.
211 acpi_register_lapic(processor->id, /* APIC ID */
212 processor->lapic_flags & ACPI_MADT_ENABLED);
218 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
220 struct acpi_madt_local_sapic *processor = NULL;
222 processor = (struct acpi_madt_local_sapic *)header;
224 if (BAD_MADT_ENTRY(processor, end))
227 acpi_table_print_madt_entry(header);
229 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
230 processor->lapic_flags & ACPI_MADT_ENABLED);
236 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
237 const unsigned long end)
239 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
241 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
243 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
246 acpi_lapic_addr = lapic_addr_ovr->address;
252 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
253 const unsigned long end)
255 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
257 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
259 if (BAD_MADT_ENTRY(x2apic_nmi, end))
262 acpi_table_print_madt_entry(header);
264 if (x2apic_nmi->lint != 1)
265 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
271 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
273 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
275 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
277 if (BAD_MADT_ENTRY(lapic_nmi, end))
280 acpi_table_print_madt_entry(header);
282 if (lapic_nmi->lint != 1)
283 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
288 #endif /*CONFIG_X86_LOCAL_APIC */
290 #ifdef CONFIG_X86_IO_APIC
293 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
295 struct acpi_madt_io_apic *ioapic = NULL;
297 ioapic = (struct acpi_madt_io_apic *)header;
299 if (BAD_MADT_ENTRY(ioapic, end))
302 acpi_table_print_madt_entry(header);
304 mp_register_ioapic(ioapic->id,
305 ioapic->address, ioapic->global_irq_base);
311 * Parse Interrupt Source Override for the ACPI SCI
313 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
315 if (trigger == 0) /* compatible SCI trigger is level */
318 if (polarity == 0) /* compatible SCI polarity is low */
321 /* Command-line over-ride via acpi_sci= */
322 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
323 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
325 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
326 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
329 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
330 * If GSI is < 16, this will update its flags,
331 * else it will create a new mp_irqs[] entry.
333 mp_override_legacy_irq(gsi, polarity, trigger, gsi);
336 * stash over-ride to indicate we've been here
337 * and for later update of acpi_gbl_FADT
339 acpi_sci_override_gsi = gsi;
344 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
345 const unsigned long end)
347 struct acpi_madt_interrupt_override *intsrc = NULL;
349 intsrc = (struct acpi_madt_interrupt_override *)header;
351 if (BAD_MADT_ENTRY(intsrc, end))
354 acpi_table_print_madt_entry(header);
356 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
357 acpi_sci_ioapic_setup(intsrc->global_irq,
358 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
359 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
363 if (acpi_skip_timer_override &&
364 intsrc->source_irq == 0 && intsrc->global_irq == 2) {
365 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
369 mp_override_legacy_irq(intsrc->source_irq,
370 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
371 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
378 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
380 struct acpi_madt_nmi_source *nmi_src = NULL;
382 nmi_src = (struct acpi_madt_nmi_source *)header;
384 if (BAD_MADT_ENTRY(nmi_src, end))
387 acpi_table_print_madt_entry(header);
389 /* TBD: Support nimsrc entries? */
394 #endif /* CONFIG_X86_IO_APIC */
397 * acpi_pic_sci_set_trigger()
399 * use ELCR to set PIC-mode trigger type for SCI
401 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
402 * it may require Edge Trigger -- use "acpi_sci=edge"
404 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
405 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
406 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
407 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
410 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
412 unsigned int mask = 1 << irq;
413 unsigned int old, new;
415 /* Real old ELCR mask */
416 old = inb(0x4d0) | (inb(0x4d1) << 8);
419 * If we use ACPI to set PCI IRQs, then we should clear ELCR
420 * since we will set it correctly as we enable the PCI irq
423 new = acpi_noirq ? old : 0;
426 * Update SCI information in the ELCR, it isn't in the PCI
430 case 1: /* Edge - clear */
433 case 3: /* Level - set */
441 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
443 outb(new >> 8, 0x4d1);
446 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
453 * success: return IRQ number (>=0)
454 * failure: return < 0
456 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
459 unsigned int plat_gsi = gsi;
463 * Make sure all (legacy) PCI IRQs are set as level-triggered.
465 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
466 if (trigger == ACPI_LEVEL_SENSITIVE)
467 eisa_set_level_irq(gsi);
471 #ifdef CONFIG_X86_IO_APIC
472 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
473 plat_gsi = mp_register_gsi(dev, gsi, trigger, polarity);
476 acpi_gsi_to_irq(plat_gsi, &irq);
481 * ACPI based hotplug support for CPU
483 #ifdef CONFIG_ACPI_HOTPLUG_CPU
485 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
487 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
488 union acpi_object *obj;
489 struct acpi_madt_local_apic *lapic;
490 cpumask_var_t tmp_map, new_map;
493 int retval = -ENOMEM;
495 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
498 if (!buffer.length || !buffer.pointer)
501 obj = buffer.pointer;
502 if (obj->type != ACPI_TYPE_BUFFER ||
503 obj->buffer.length < sizeof(*lapic)) {
504 kfree(buffer.pointer);
508 lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
510 if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
511 !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
512 kfree(buffer.pointer);
518 kfree(buffer.pointer);
519 buffer.length = ACPI_ALLOCATE_BUFFER;
520 buffer.pointer = NULL;
522 if (!alloc_cpumask_var(&tmp_map, GFP_KERNEL))
525 if (!alloc_cpumask_var(&new_map, GFP_KERNEL))
528 cpumask_copy(tmp_map, cpu_present_mask);
529 acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
532 * If mp_register_lapic successfully generates a new logical cpu
533 * number, then the following will get us exactly what was mapped
535 cpumask_andnot(new_map, cpu_present_mask, tmp_map);
536 if (cpumask_empty(new_map)) {
537 printk ("Unable to map lapic to logical cpu number\n");
542 cpu = cpumask_first(new_map);
548 free_cpumask_var(new_map);
550 free_cpumask_var(tmp_map);
555 /* wrapper to silence section mismatch warning */
556 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
558 return _acpi_map_lsapic(handle, pcpu);
560 EXPORT_SYMBOL(acpi_map_lsapic);
562 int acpi_unmap_lsapic(int cpu)
564 per_cpu(x86_cpu_to_apicid, cpu) = -1;
565 set_cpu_present(cpu, false);
571 EXPORT_SYMBOL(acpi_unmap_lsapic);
572 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
574 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
580 EXPORT_SYMBOL(acpi_register_ioapic);
582 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
588 EXPORT_SYMBOL(acpi_unregister_ioapic);
590 static int __init acpi_parse_sbf(struct acpi_table_header *table)
592 struct acpi_table_boot *sb;
594 sb = (struct acpi_table_boot *)table;
596 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
600 sbf_port = sb->cmos_index; /* Save CMOS port */
605 #ifdef CONFIG_HPET_TIMER
606 #include <asm/hpet.h>
608 static struct __initdata resource *hpet_res;
610 static int __init acpi_parse_hpet(struct acpi_table_header *table)
612 struct acpi_table_hpet *hpet_tbl;
614 hpet_tbl = (struct acpi_table_hpet *)table;
616 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
620 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
621 printk(KERN_WARNING PREFIX "HPET timers must be located in "
626 hpet_address = hpet_tbl->address.address;
629 * Some broken BIOSes advertise HPET at 0x0. We really do not
630 * want to allocate a resource there.
633 printk(KERN_WARNING PREFIX
634 "HPET id: %#x base: %#lx is invalid\n",
635 hpet_tbl->id, hpet_address);
640 * Some even more broken BIOSes advertise HPET at
641 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
644 if (hpet_address == 0xfed0000000000000UL) {
645 if (!hpet_force_user) {
646 printk(KERN_WARNING PREFIX "HPET id: %#x "
647 "base: 0xfed0000000000000 is bogus\n "
648 "try hpet=force on the kernel command line to "
649 "fix it up to 0xfed00000.\n", hpet_tbl->id);
653 printk(KERN_WARNING PREFIX
654 "HPET id: %#x base: 0xfed0000000000000 fixed up "
655 "to 0xfed00000.\n", hpet_tbl->id);
659 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
660 hpet_tbl->id, hpet_address);
663 * Allocate and initialize the HPET firmware resource for adding into
664 * the resource tree during the lateinit timeframe.
666 #define HPET_RESOURCE_NAME_SIZE 9
667 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
669 hpet_res->name = (void *)&hpet_res[1];
670 hpet_res->flags = IORESOURCE_MEM;
671 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
674 hpet_res->start = hpet_address;
675 hpet_res->end = hpet_address + (1 * 1024) - 1;
681 * hpet_insert_resource inserts the HPET resources used into the resource
684 static __init int hpet_insert_resource(void)
689 return insert_resource(&iomem_resource, hpet_res);
692 late_initcall(hpet_insert_resource);
695 #define acpi_parse_hpet NULL
698 static int __init acpi_parse_fadt(struct acpi_table_header *table)
701 #ifdef CONFIG_X86_PM_TIMER
702 /* detect the location of the ACPI PM Timer */
703 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
705 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
706 ACPI_ADR_SPACE_SYSTEM_IO)
709 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
711 * "X" fields are optional extensions to the original V1.0
712 * fields, so we must selectively expand V1.0 fields if the
713 * corresponding X field is zero.
716 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
719 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
722 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
728 #ifdef CONFIG_X86_LOCAL_APIC
730 * Parse LAPIC entries in MADT
731 * returns 0 on success, < 0 on error
734 static void __init acpi_register_lapic_address(unsigned long address)
736 mp_lapic_addr = address;
738 set_fixmap_nocache(FIX_APIC_BASE, address);
739 if (boot_cpu_physical_apicid == -1U) {
740 boot_cpu_physical_apicid = read_apic_id();
741 apic_version[boot_cpu_physical_apicid] =
742 GET_APIC_VERSION(apic_read(APIC_LVR));
746 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
754 * Note that the LAPIC address is obtained from the MADT (32-bit value)
755 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
759 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
760 acpi_parse_lapic_addr_ovr, 0);
762 printk(KERN_ERR PREFIX
763 "Error parsing LAPIC address override entry\n");
767 acpi_register_lapic_address(acpi_lapic_addr);
772 static int __init acpi_parse_madt_lapic_entries(void)
781 * Note that the LAPIC address is obtained from the MADT (32-bit value)
782 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
786 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
787 acpi_parse_lapic_addr_ovr, 0);
789 printk(KERN_ERR PREFIX
790 "Error parsing LAPIC address override entry\n");
794 acpi_register_lapic_address(acpi_lapic_addr);
796 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
797 acpi_parse_sapic, MAX_APICS);
800 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
801 acpi_parse_x2apic, MAX_APICS);
802 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
803 acpi_parse_lapic, MAX_APICS);
805 if (!count && !x2count) {
806 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
807 /* TBD: Cleanup to allow fallback to MPS */
809 } else if (count < 0 || x2count < 0) {
810 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
811 /* TBD: Cleanup to allow fallback to MPS */
816 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
817 acpi_parse_x2apic_nmi, 0);
819 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
820 if (count < 0 || x2count < 0) {
821 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
822 /* TBD: Cleanup to allow fallback to MPS */
827 #endif /* CONFIG_X86_LOCAL_APIC */
829 #ifdef CONFIG_X86_IO_APIC
832 #ifdef CONFIG_X86_ES7000
833 extern int es7000_plat;
839 } mp_ioapic_routing[MAX_IO_APICS];
841 int mp_find_ioapic(int gsi)
845 /* Find the IOAPIC that manages this GSI. */
846 for (i = 0; i < nr_ioapics; i++) {
847 if ((gsi >= mp_ioapic_routing[i].gsi_base)
848 && (gsi <= mp_ioapic_routing[i].gsi_end))
852 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
856 int mp_find_ioapic_pin(int ioapic, int gsi)
858 if (WARN_ON(ioapic == -1))
860 if (WARN_ON(gsi > mp_ioapic_routing[ioapic].gsi_end))
863 return gsi - mp_ioapic_routing[ioapic].gsi_base;
866 static u8 __init uniq_ioapic_id(u8 id)
869 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
870 !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
871 return io_apic_get_unique_id(nr_ioapics, id);
876 DECLARE_BITMAP(used, 256);
877 bitmap_zero(used, 256);
878 for (i = 0; i < nr_ioapics; i++) {
879 struct mpc_ioapic *ia = &mp_ioapics[i];
880 __set_bit(ia->apicid, used);
882 if (!test_bit(id, used))
884 return find_first_zero_bit(used, 256);
888 static int bad_ioapic(unsigned long address)
890 if (nr_ioapics >= MAX_IO_APICS) {
891 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
892 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
893 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
896 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
897 " found in table, skipping!\n");
903 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
907 if (bad_ioapic(address))
912 mp_ioapics[idx].type = MP_IOAPIC;
913 mp_ioapics[idx].flags = MPC_APIC_USABLE;
914 mp_ioapics[idx].apicaddr = address;
916 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
917 mp_ioapics[idx].apicid = uniq_ioapic_id(id);
918 mp_ioapics[idx].apicver = io_apic_get_version(idx);
921 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
922 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
924 mp_ioapic_routing[idx].gsi_base = gsi_base;
925 mp_ioapic_routing[idx].gsi_end = gsi_base +
926 io_apic_get_redir_entries(idx);
928 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
929 "GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
930 mp_ioapics[idx].apicver, mp_ioapics[idx].apicaddr,
931 mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end);
936 int __init acpi_probe_gsi(void)
949 for (idx = 0; idx < nr_ioapics; idx++) {
950 gsi = mp_ioapic_routing[idx].gsi_end;
959 static void assign_to_mp_irq(struct mpc_intsrc *m,
960 struct mpc_intsrc *mp_irq)
962 memcpy(mp_irq, m, sizeof(struct mpc_intsrc));
965 static int mp_irq_cmp(struct mpc_intsrc *mp_irq,
966 struct mpc_intsrc *m)
968 return memcmp(mp_irq, m, sizeof(struct mpc_intsrc));
971 static void save_mp_irq(struct mpc_intsrc *m)
975 for (i = 0; i < mp_irq_entries; i++) {
976 if (!mp_irq_cmp(&mp_irqs[i], m))
980 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
981 if (++mp_irq_entries == MAX_IRQ_SOURCES)
982 panic("Max # of irq sources exceeded!!\n");
985 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
989 struct mpc_intsrc mp_irq;
992 * Convert 'gsi' to 'ioapic.pin'.
994 ioapic = mp_find_ioapic(gsi);
997 pin = mp_find_ioapic_pin(ioapic, gsi);
1000 * TBD: This check is for faulty timer entries, where the override
1001 * erroneously sets the trigger to level, resulting in a HUGE
1002 * increase of timer interrupts!
1004 if ((bus_irq == 0) && (trigger == 3))
1007 mp_irq.type = MP_INTSRC;
1008 mp_irq.irqtype = mp_INT;
1009 mp_irq.irqflag = (trigger << 2) | polarity;
1010 mp_irq.srcbus = MP_ISA_BUS;
1011 mp_irq.srcbusirq = bus_irq; /* IRQ */
1012 mp_irq.dstapic = mp_ioapics[ioapic].apicid; /* APIC ID */
1013 mp_irq.dstirq = pin; /* INTIN# */
1015 save_mp_irq(&mp_irq);
1018 void __init mp_config_acpi_legacy_irqs(void)
1022 unsigned int dstapic;
1023 struct mpc_intsrc mp_irq;
1025 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
1027 * Fabricate the legacy ISA bus (bus #31).
1029 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1031 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1032 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1034 #ifdef CONFIG_X86_ES7000
1036 * Older generations of ES7000 have no legacy identity mappings
1038 if (es7000_plat == 1)
1043 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1045 ioapic = mp_find_ioapic(0);
1048 dstapic = mp_ioapics[ioapic].apicid;
1051 * Use the default configuration for the IRQs 0-15. Unless
1052 * overridden by (MADT) interrupt source override entries.
1054 for (i = 0; i < 16; i++) {
1057 for (idx = 0; idx < mp_irq_entries; idx++) {
1058 struct mpc_intsrc *irq = mp_irqs + idx;
1060 /* Do we already have a mapping for this ISA IRQ? */
1061 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1064 /* Do we already have a mapping for this IOAPIC pin */
1065 if (irq->dstapic == dstapic && irq->dstirq == i)
1069 if (idx != mp_irq_entries) {
1070 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1071 continue; /* IRQ already used */
1074 mp_irq.type = MP_INTSRC;
1075 mp_irq.irqflag = 0; /* Conforming */
1076 mp_irq.srcbus = MP_ISA_BUS;
1077 mp_irq.dstapic = dstapic;
1078 mp_irq.irqtype = mp_INT;
1079 mp_irq.srcbusirq = i; /* Identity mapped */
1082 save_mp_irq(&mp_irq);
1086 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
1089 #ifdef CONFIG_X86_MPPARSE
1090 struct mpc_intsrc mp_irq;
1091 struct pci_dev *pdev;
1092 unsigned char number;
1101 if (dev->bus != &pci_bus_type)
1104 pdev = to_pci_dev(dev);
1105 number = pdev->bus->number;
1106 devfn = pdev->devfn;
1108 /* print the entry should happen on mptable identically */
1109 mp_irq.type = MP_INTSRC;
1110 mp_irq.irqtype = mp_INT;
1111 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
1112 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
1113 mp_irq.srcbus = number;
1114 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
1115 ioapic = mp_find_ioapic(gsi);
1116 mp_irq.dstapic = mp_ioapics[ioapic].apicid;
1117 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
1119 save_mp_irq(&mp_irq);
1124 int mp_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
1128 struct io_apic_irq_attr irq_attr;
1130 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
1133 /* Don't set up the ACPI SCI because it's already set up */
1134 if (acpi_gbl_FADT.sci_interrupt == gsi)
1137 ioapic = mp_find_ioapic(gsi);
1139 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1143 ioapic_pin = mp_find_ioapic_pin(ioapic, gsi);
1145 #ifdef CONFIG_X86_32
1146 if (ioapic_renumber_irq)
1147 gsi = ioapic_renumber_irq(ioapic, gsi);
1150 if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
1151 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1152 "%d-%d\n", mp_ioapics[ioapic].apicid,
1157 if (enable_update_mptable)
1158 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
1160 set_io_apic_irq_attr(&irq_attr, ioapic, ioapic_pin,
1161 trigger == ACPI_EDGE_SENSITIVE ? 0 : 1,
1162 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1163 io_apic_set_pci_routing(dev, gsi, &irq_attr);
1169 * Parse IOAPIC related entries in MADT
1170 * returns 0 on success, < 0 on error
1172 static int __init acpi_parse_madt_ioapic_entries(void)
1177 * ACPI interpreter is required to complete interrupt setup,
1178 * so if it is off, don't enumerate the io-apics with ACPI.
1179 * If MPS is present, it will handle them,
1180 * otherwise the system will stay in PIC mode
1182 if (acpi_disabled || acpi_noirq) {
1190 * if "noapic" boot option, don't look for IO-APICs
1192 if (skip_ioapic_setup) {
1193 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1194 "due to 'noapic' option.\n");
1199 acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1202 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1204 } else if (count < 0) {
1205 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1210 acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
1213 printk(KERN_ERR PREFIX
1214 "Error parsing interrupt source overrides entry\n");
1215 /* TBD: Cleanup to allow fallback to MPS */
1220 * If BIOS did not supply an INT_SRC_OVR for the SCI
1221 * pretend we got one so we can set the SCI flags.
1223 if (!acpi_sci_override_gsi)
1224 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
1226 /* Fill in identity legacy mapings where no override */
1227 mp_config_acpi_legacy_irqs();
1230 acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
1233 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1234 /* TBD: Cleanup to allow fallback to MPS */
1241 static inline int acpi_parse_madt_ioapic_entries(void)
1245 #endif /* !CONFIG_X86_IO_APIC */
1247 static void __init early_acpi_process_madt(void)
1249 #ifdef CONFIG_X86_LOCAL_APIC
1252 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1255 * Parse MADT LAPIC entries
1257 error = early_acpi_parse_madt_lapic_addr_ovr();
1260 smp_found_config = 1;
1262 if (error == -EINVAL) {
1264 * Dell Precision Workstation 410, 610 come here.
1266 printk(KERN_ERR PREFIX
1267 "Invalid BIOS MADT, disabling ACPI\n");
1274 static void __init acpi_process_madt(void)
1276 #ifdef CONFIG_X86_LOCAL_APIC
1279 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1282 * Parse MADT LAPIC entries
1284 error = acpi_parse_madt_lapic_entries();
1288 #ifdef CONFIG_X86_BIGSMP
1289 generic_bigsmp_probe();
1292 * Parse MADT IO-APIC entries
1294 error = acpi_parse_madt_ioapic_entries();
1296 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
1299 smp_found_config = 1;
1300 if (apic->setup_apic_routing)
1301 apic->setup_apic_routing();
1304 if (error == -EINVAL) {
1306 * Dell Precision Workstation 410, 610 come here.
1308 printk(KERN_ERR PREFIX
1309 "Invalid BIOS MADT, disabling ACPI\n");
1314 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1315 * In the event an MPS table was found, forget it.
1316 * Boot with "acpi=off" to use MPS on such a system.
1318 if (smp_found_config) {
1319 printk(KERN_WARNING PREFIX
1320 "No APIC-table, disabling MPS\n");
1321 smp_found_config = 0;
1326 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1327 * processors, where MPS only supports physical.
1329 if (acpi_lapic && acpi_ioapic)
1330 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1332 else if (acpi_lapic)
1333 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1334 "configuration information\n");
1339 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1342 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1349 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1352 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1359 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1362 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1366 "Warning: DMI blacklist says broken, but acpi forced\n");
1372 * Limit ACPI to CPU enumeration for HT
1374 static int __init force_acpi_ht(const struct dmi_system_id *d)
1377 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
1383 "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
1389 * Force ignoring BIOS IRQ0 pin2 override
1391 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1394 * The ati_ixp4x0_rev() early PCI quirk should have set
1395 * the acpi_skip_timer_override flag already:
1397 if (!acpi_skip_timer_override) {
1398 WARN(1, KERN_ERR "ati_ixp4x0 quirk not complete.\n");
1399 pr_notice("%s detected: Ignoring BIOS IRQ0 pin2 override\n",
1401 acpi_skip_timer_override = 1;
1407 * If your system is blacklisted here, but you find that acpi=force
1408 * works for you, please contact linux-acpi@vger.kernel.org
1410 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1412 * Boxes that need ACPI disabled
1415 .callback = dmi_disable_acpi,
1416 .ident = "IBM Thinkpad",
1418 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1419 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1424 * Boxes that need acpi=ht
1427 .callback = force_acpi_ht,
1428 .ident = "FSC Primergy T850",
1430 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1431 DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1435 .callback = force_acpi_ht,
1436 .ident = "HP VISUALIZE NT Workstation",
1438 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1439 DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1443 .callback = force_acpi_ht,
1444 .ident = "Compaq Workstation W8000",
1446 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1447 DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1451 .callback = force_acpi_ht,
1452 .ident = "ASUS P2B-DS",
1454 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1455 DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1459 .callback = force_acpi_ht,
1460 .ident = "ASUS CUR-DLS",
1462 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1463 DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1467 .callback = force_acpi_ht,
1468 .ident = "ABIT i440BX-W83977",
1470 DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1471 DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1475 .callback = force_acpi_ht,
1476 .ident = "IBM Bladecenter",
1478 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1479 DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1483 .callback = force_acpi_ht,
1484 .ident = "IBM eServer xSeries 360",
1486 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1487 DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1491 .callback = force_acpi_ht,
1492 .ident = "IBM eserver xSeries 330",
1494 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1495 DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1499 .callback = force_acpi_ht,
1500 .ident = "IBM eserver xSeries 440",
1502 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1503 DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1508 * Boxes that need ACPI PCI IRQ routing disabled
1511 .callback = disable_acpi_irq,
1512 .ident = "ASUS A7V",
1514 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1515 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1516 /* newer BIOS, Revision 1011, does work */
1517 DMI_MATCH(DMI_BIOS_VERSION,
1518 "ASUS A7V ACPI BIOS Revision 1007"),
1523 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1524 * for LPC bridge, which is needed for the PCI
1525 * interrupt links to work. DSDT fix is in bug 5966.
1526 * 2645, 2646 model numbers are shared with 600/600E/600X
1528 .callback = disable_acpi_irq,
1529 .ident = "IBM Thinkpad 600 Series 2645",
1531 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1532 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1536 .callback = disable_acpi_irq,
1537 .ident = "IBM Thinkpad 600 Series 2646",
1539 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1540 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1544 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1547 .callback = disable_acpi_pci,
1548 .ident = "ASUS PR-DLS",
1550 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1551 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1552 DMI_MATCH(DMI_BIOS_VERSION,
1553 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1554 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1558 .callback = disable_acpi_pci,
1559 .ident = "Acer TravelMate 36x Laptop",
1561 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1562 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1568 /* second table for DMI checks that should run after early-quirks */
1569 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1571 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1572 * which includes some code which overrides all temperature
1573 * trip points to 16C if the INTIN2 input of the I/O APIC
1574 * is enabled. This input is incorrectly designated the
1575 * ISA IRQ 0 via an interrupt source override even though
1576 * it is wired to the output of the master 8259A and INTIN0
1577 * is not connected at all. Force ignoring BIOS IRQ0 pin2
1578 * override in that cases.
1581 .callback = dmi_ignore_irq0_timer_override,
1582 .ident = "HP nx6115 laptop",
1584 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1585 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1589 .callback = dmi_ignore_irq0_timer_override,
1590 .ident = "HP NX6125 laptop",
1592 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1593 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1597 .callback = dmi_ignore_irq0_timer_override,
1598 .ident = "HP NX6325 laptop",
1600 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1601 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1605 .callback = dmi_ignore_irq0_timer_override,
1606 .ident = "HP 6715b laptop",
1608 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1609 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1616 * acpi_boot_table_init() and acpi_boot_init()
1617 * called from setup_arch(), always.
1618 * 1. checksums all tables
1619 * 2. enumerates lapics
1620 * 3. enumerates io-apics
1622 * acpi_table_init() is separate to allow reading SRAT without
1623 * other side effects.
1625 * side effects of acpi_boot_init:
1626 * acpi_lapic = 1 if LAPIC found
1627 * acpi_ioapic = 1 if IOAPIC found
1628 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1629 * if acpi_blacklisted() acpi_disabled = 1;
1630 * acpi_irq_model=...
1633 * return value: (currently ignored)
1638 int __init acpi_boot_table_init(void)
1642 dmi_check_system(acpi_dmi_table);
1645 * If acpi_disabled, bail out
1646 * One exception: acpi=ht continues far enough to enumerate LAPICs
1648 if (acpi_disabled && !acpi_ht)
1652 * Initialize the ACPI boot-time table parser.
1654 error = acpi_table_init();
1660 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1663 * blacklist may disable ACPI entirely
1665 error = acpi_blacklisted();
1668 printk(KERN_WARNING PREFIX "acpi=force override\n");
1670 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1679 int __init early_acpi_boot_init(void)
1682 * If acpi_disabled, bail out
1683 * One exception: acpi=ht continues far enough to enumerate LAPICs
1685 if (acpi_disabled && !acpi_ht)
1689 * Process the Multiple APIC Description Table (MADT), if present
1691 early_acpi_process_madt();
1696 int __init acpi_boot_init(void)
1698 /* those are executed after early-quirks are executed */
1699 dmi_check_system(acpi_dmi_table_late);
1702 * If acpi_disabled, bail out
1703 * One exception: acpi=ht continues far enough to enumerate LAPICs
1705 if (acpi_disabled && !acpi_ht)
1708 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1711 * set sci_int and PM timer address
1713 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1716 * Process the Multiple APIC Description Table (MADT), if present
1718 acpi_process_madt();
1720 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1725 static int __init parse_acpi(char *arg)
1730 /* "acpi=off" disables both ACPI table parsing and interpreter */
1731 if (strcmp(arg, "off") == 0) {
1734 /* acpi=force to over-ride black-list */
1735 else if (strcmp(arg, "force") == 0) {
1740 /* acpi=strict disables out-of-spec workarounds */
1741 else if (strcmp(arg, "strict") == 0) {
1744 /* Limit ACPI just to boot-time to enable HT */
1745 else if (strcmp(arg, "ht") == 0) {
1750 /* acpi=rsdt use RSDT instead of XSDT */
1751 else if (strcmp(arg, "rsdt") == 0) {
1752 acpi_rsdt_forced = 1;
1754 /* "acpi=noirq" disables ACPI interrupt routing */
1755 else if (strcmp(arg, "noirq") == 0) {
1758 /* Core will printk when we return error. */
1763 early_param("acpi", parse_acpi);
1765 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1766 static int __init parse_pci(char *arg)
1768 if (arg && strcmp(arg, "noacpi") == 0)
1772 early_param("pci", parse_pci);
1774 int __init acpi_mps_check(void)
1776 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1777 /* mptable code is not built-in*/
1778 if (acpi_disabled || acpi_noirq) {
1779 printk(KERN_WARNING "MPS support code is not built-in.\n"
1780 "Using acpi=off or acpi=noirq or pci=noacpi "
1781 "may have problem\n");
1788 #ifdef CONFIG_X86_IO_APIC
1789 static int __init parse_acpi_skip_timer_override(char *arg)
1791 acpi_skip_timer_override = 1;
1794 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1796 static int __init parse_acpi_use_timer_override(char *arg)
1798 acpi_use_timer_override = 1;
1801 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1802 #endif /* CONFIG_X86_IO_APIC */
1804 static int __init setup_acpi_sci(char *s)
1808 if (!strcmp(s, "edge"))
1809 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1810 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1811 else if (!strcmp(s, "level"))
1812 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1813 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1814 else if (!strcmp(s, "high"))
1815 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1816 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1817 else if (!strcmp(s, "low"))
1818 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1819 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1824 early_param("acpi_sci", setup_acpi_sci);
1826 int __acpi_acquire_global_lock(unsigned int *lock)
1828 unsigned int old, new, val;
1831 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1832 val = cmpxchg(lock, old, new);
1833 } while (unlikely (val != old));
1834 return (new < 3) ? -1 : 0;
1837 int __acpi_release_global_lock(unsigned int *lock)
1839 unsigned int old, new, val;
1843 val = cmpxchg(lock, old, new);
1844 } while (unlikely (val != old));