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;
627 hpet_blockid = hpet_tbl->sequence;
630 * Some broken BIOSes advertise HPET at 0x0. We really do not
631 * want to allocate a resource there.
634 printk(KERN_WARNING PREFIX
635 "HPET id: %#x base: %#lx is invalid\n",
636 hpet_tbl->id, hpet_address);
641 * Some even more broken BIOSes advertise HPET at
642 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
645 if (hpet_address == 0xfed0000000000000UL) {
646 if (!hpet_force_user) {
647 printk(KERN_WARNING PREFIX "HPET id: %#x "
648 "base: 0xfed0000000000000 is bogus\n "
649 "try hpet=force on the kernel command line to "
650 "fix it up to 0xfed00000.\n", hpet_tbl->id);
654 printk(KERN_WARNING PREFIX
655 "HPET id: %#x base: 0xfed0000000000000 fixed up "
656 "to 0xfed00000.\n", hpet_tbl->id);
660 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
661 hpet_tbl->id, hpet_address);
664 * Allocate and initialize the HPET firmware resource for adding into
665 * the resource tree during the lateinit timeframe.
667 #define HPET_RESOURCE_NAME_SIZE 9
668 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
670 hpet_res->name = (void *)&hpet_res[1];
671 hpet_res->flags = IORESOURCE_MEM;
672 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
675 hpet_res->start = hpet_address;
676 hpet_res->end = hpet_address + (1 * 1024) - 1;
682 * hpet_insert_resource inserts the HPET resources used into the resource
685 static __init int hpet_insert_resource(void)
690 return insert_resource(&iomem_resource, hpet_res);
693 late_initcall(hpet_insert_resource);
696 #define acpi_parse_hpet NULL
699 static int __init acpi_parse_fadt(struct acpi_table_header *table)
702 #ifdef CONFIG_X86_PM_TIMER
703 /* detect the location of the ACPI PM Timer */
704 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
706 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
707 ACPI_ADR_SPACE_SYSTEM_IO)
710 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
712 * "X" fields are optional extensions to the original V1.0
713 * fields, so we must selectively expand V1.0 fields if the
714 * corresponding X field is zero.
717 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
720 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
723 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
729 #ifdef CONFIG_X86_LOCAL_APIC
731 * Parse LAPIC entries in MADT
732 * returns 0 on success, < 0 on error
735 static void __init acpi_register_lapic_address(unsigned long address)
737 mp_lapic_addr = address;
739 set_fixmap_nocache(FIX_APIC_BASE, address);
740 if (boot_cpu_physical_apicid == -1U) {
741 boot_cpu_physical_apicid = read_apic_id();
742 apic_version[boot_cpu_physical_apicid] =
743 GET_APIC_VERSION(apic_read(APIC_LVR));
747 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
755 * Note that the LAPIC address is obtained from the MADT (32-bit value)
756 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
760 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
761 acpi_parse_lapic_addr_ovr, 0);
763 printk(KERN_ERR PREFIX
764 "Error parsing LAPIC address override entry\n");
768 acpi_register_lapic_address(acpi_lapic_addr);
773 static int __init acpi_parse_madt_lapic_entries(void)
782 * Note that the LAPIC address is obtained from the MADT (32-bit value)
783 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
787 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
788 acpi_parse_lapic_addr_ovr, 0);
790 printk(KERN_ERR PREFIX
791 "Error parsing LAPIC address override entry\n");
795 acpi_register_lapic_address(acpi_lapic_addr);
797 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
798 acpi_parse_sapic, MAX_APICS);
801 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
802 acpi_parse_x2apic, MAX_APICS);
803 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
804 acpi_parse_lapic, MAX_APICS);
806 if (!count && !x2count) {
807 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
808 /* TBD: Cleanup to allow fallback to MPS */
810 } else if (count < 0 || x2count < 0) {
811 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
812 /* TBD: Cleanup to allow fallback to MPS */
817 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
818 acpi_parse_x2apic_nmi, 0);
820 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
821 if (count < 0 || x2count < 0) {
822 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
823 /* TBD: Cleanup to allow fallback to MPS */
828 #endif /* CONFIG_X86_LOCAL_APIC */
830 #ifdef CONFIG_X86_IO_APIC
833 #ifdef CONFIG_X86_ES7000
834 extern int es7000_plat;
840 } mp_ioapic_routing[MAX_IO_APICS];
842 int mp_find_ioapic(int gsi)
846 /* Find the IOAPIC that manages this GSI. */
847 for (i = 0; i < nr_ioapics; i++) {
848 if ((gsi >= mp_ioapic_routing[i].gsi_base)
849 && (gsi <= mp_ioapic_routing[i].gsi_end))
853 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
857 int mp_find_ioapic_pin(int ioapic, int gsi)
859 if (WARN_ON(ioapic == -1))
861 if (WARN_ON(gsi > mp_ioapic_routing[ioapic].gsi_end))
864 return gsi - mp_ioapic_routing[ioapic].gsi_base;
867 static u8 __init uniq_ioapic_id(u8 id)
870 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
871 !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
872 return io_apic_get_unique_id(nr_ioapics, id);
877 DECLARE_BITMAP(used, 256);
878 bitmap_zero(used, 256);
879 for (i = 0; i < nr_ioapics; i++) {
880 struct mpc_ioapic *ia = &mp_ioapics[i];
881 __set_bit(ia->apicid, used);
883 if (!test_bit(id, used))
885 return find_first_zero_bit(used, 256);
889 static int bad_ioapic(unsigned long address)
891 if (nr_ioapics >= MAX_IO_APICS) {
892 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
893 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
894 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
897 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
898 " found in table, skipping!\n");
904 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
908 if (bad_ioapic(address))
913 mp_ioapics[idx].type = MP_IOAPIC;
914 mp_ioapics[idx].flags = MPC_APIC_USABLE;
915 mp_ioapics[idx].apicaddr = address;
917 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
918 mp_ioapics[idx].apicid = uniq_ioapic_id(id);
919 mp_ioapics[idx].apicver = io_apic_get_version(idx);
922 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
923 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
925 mp_ioapic_routing[idx].gsi_base = gsi_base;
926 mp_ioapic_routing[idx].gsi_end = gsi_base +
927 io_apic_get_redir_entries(idx);
929 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
930 "GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
931 mp_ioapics[idx].apicver, mp_ioapics[idx].apicaddr,
932 mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end);
937 int __init acpi_probe_gsi(void)
950 for (idx = 0; idx < nr_ioapics; idx++) {
951 gsi = mp_ioapic_routing[idx].gsi_end;
960 static void assign_to_mp_irq(struct mpc_intsrc *m,
961 struct mpc_intsrc *mp_irq)
963 memcpy(mp_irq, m, sizeof(struct mpc_intsrc));
966 static int mp_irq_cmp(struct mpc_intsrc *mp_irq,
967 struct mpc_intsrc *m)
969 return memcmp(mp_irq, m, sizeof(struct mpc_intsrc));
972 static void save_mp_irq(struct mpc_intsrc *m)
976 for (i = 0; i < mp_irq_entries; i++) {
977 if (!mp_irq_cmp(&mp_irqs[i], m))
981 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
982 if (++mp_irq_entries == MAX_IRQ_SOURCES)
983 panic("Max # of irq sources exceeded!!\n");
986 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
990 struct mpc_intsrc mp_irq;
993 * Convert 'gsi' to 'ioapic.pin'.
995 ioapic = mp_find_ioapic(gsi);
998 pin = mp_find_ioapic_pin(ioapic, gsi);
1001 * TBD: This check is for faulty timer entries, where the override
1002 * erroneously sets the trigger to level, resulting in a HUGE
1003 * increase of timer interrupts!
1005 if ((bus_irq == 0) && (trigger == 3))
1008 mp_irq.type = MP_INTSRC;
1009 mp_irq.irqtype = mp_INT;
1010 mp_irq.irqflag = (trigger << 2) | polarity;
1011 mp_irq.srcbus = MP_ISA_BUS;
1012 mp_irq.srcbusirq = bus_irq; /* IRQ */
1013 mp_irq.dstapic = mp_ioapics[ioapic].apicid; /* APIC ID */
1014 mp_irq.dstirq = pin; /* INTIN# */
1016 save_mp_irq(&mp_irq);
1019 void __init mp_config_acpi_legacy_irqs(void)
1023 unsigned int dstapic;
1024 struct mpc_intsrc mp_irq;
1026 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
1028 * Fabricate the legacy ISA bus (bus #31).
1030 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1032 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1033 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1035 #ifdef CONFIG_X86_ES7000
1037 * Older generations of ES7000 have no legacy identity mappings
1039 if (es7000_plat == 1)
1044 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1046 ioapic = mp_find_ioapic(0);
1049 dstapic = mp_ioapics[ioapic].apicid;
1052 * Use the default configuration for the IRQs 0-15. Unless
1053 * overridden by (MADT) interrupt source override entries.
1055 for (i = 0; i < 16; i++) {
1058 for (idx = 0; idx < mp_irq_entries; idx++) {
1059 struct mpc_intsrc *irq = mp_irqs + idx;
1061 /* Do we already have a mapping for this ISA IRQ? */
1062 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1065 /* Do we already have a mapping for this IOAPIC pin */
1066 if (irq->dstapic == dstapic && irq->dstirq == i)
1070 if (idx != mp_irq_entries) {
1071 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1072 continue; /* IRQ already used */
1075 mp_irq.type = MP_INTSRC;
1076 mp_irq.irqflag = 0; /* Conforming */
1077 mp_irq.srcbus = MP_ISA_BUS;
1078 mp_irq.dstapic = dstapic;
1079 mp_irq.irqtype = mp_INT;
1080 mp_irq.srcbusirq = i; /* Identity mapped */
1083 save_mp_irq(&mp_irq);
1087 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
1090 #ifdef CONFIG_X86_MPPARSE
1091 struct mpc_intsrc mp_irq;
1092 struct pci_dev *pdev;
1093 unsigned char number;
1102 if (dev->bus != &pci_bus_type)
1105 pdev = to_pci_dev(dev);
1106 number = pdev->bus->number;
1107 devfn = pdev->devfn;
1109 /* print the entry should happen on mptable identically */
1110 mp_irq.type = MP_INTSRC;
1111 mp_irq.irqtype = mp_INT;
1112 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
1113 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
1114 mp_irq.srcbus = number;
1115 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
1116 ioapic = mp_find_ioapic(gsi);
1117 mp_irq.dstapic = mp_ioapics[ioapic].apicid;
1118 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
1120 save_mp_irq(&mp_irq);
1125 int mp_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
1129 struct io_apic_irq_attr irq_attr;
1131 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
1134 /* Don't set up the ACPI SCI because it's already set up */
1135 if (acpi_gbl_FADT.sci_interrupt == gsi)
1138 ioapic = mp_find_ioapic(gsi);
1140 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1144 ioapic_pin = mp_find_ioapic_pin(ioapic, gsi);
1146 #ifdef CONFIG_X86_32
1147 if (ioapic_renumber_irq)
1148 gsi = ioapic_renumber_irq(ioapic, gsi);
1151 if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
1152 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1153 "%d-%d\n", mp_ioapics[ioapic].apicid,
1158 if (enable_update_mptable)
1159 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
1161 set_io_apic_irq_attr(&irq_attr, ioapic, ioapic_pin,
1162 trigger == ACPI_EDGE_SENSITIVE ? 0 : 1,
1163 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1164 io_apic_set_pci_routing(dev, gsi, &irq_attr);
1170 * Parse IOAPIC related entries in MADT
1171 * returns 0 on success, < 0 on error
1173 static int __init acpi_parse_madt_ioapic_entries(void)
1178 * ACPI interpreter is required to complete interrupt setup,
1179 * so if it is off, don't enumerate the io-apics with ACPI.
1180 * If MPS is present, it will handle them,
1181 * otherwise the system will stay in PIC mode
1183 if (acpi_disabled || acpi_noirq) {
1191 * if "noapic" boot option, don't look for IO-APICs
1193 if (skip_ioapic_setup) {
1194 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1195 "due to 'noapic' option.\n");
1200 acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1203 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1205 } else if (count < 0) {
1206 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1211 acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
1214 printk(KERN_ERR PREFIX
1215 "Error parsing interrupt source overrides entry\n");
1216 /* TBD: Cleanup to allow fallback to MPS */
1221 * If BIOS did not supply an INT_SRC_OVR for the SCI
1222 * pretend we got one so we can set the SCI flags.
1224 if (!acpi_sci_override_gsi)
1225 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
1227 /* Fill in identity legacy mapings where no override */
1228 mp_config_acpi_legacy_irqs();
1231 acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
1234 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1235 /* TBD: Cleanup to allow fallback to MPS */
1242 static inline int acpi_parse_madt_ioapic_entries(void)
1246 #endif /* !CONFIG_X86_IO_APIC */
1248 static void __init early_acpi_process_madt(void)
1250 #ifdef CONFIG_X86_LOCAL_APIC
1253 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1256 * Parse MADT LAPIC entries
1258 error = early_acpi_parse_madt_lapic_addr_ovr();
1261 smp_found_config = 1;
1263 if (error == -EINVAL) {
1265 * Dell Precision Workstation 410, 610 come here.
1267 printk(KERN_ERR PREFIX
1268 "Invalid BIOS MADT, disabling ACPI\n");
1275 static void __init acpi_process_madt(void)
1277 #ifdef CONFIG_X86_LOCAL_APIC
1280 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1283 * Parse MADT LAPIC entries
1285 error = acpi_parse_madt_lapic_entries();
1289 #ifdef CONFIG_X86_BIGSMP
1290 generic_bigsmp_probe();
1293 * Parse MADT IO-APIC entries
1295 error = acpi_parse_madt_ioapic_entries();
1297 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
1300 smp_found_config = 1;
1301 if (apic->setup_apic_routing)
1302 apic->setup_apic_routing();
1305 if (error == -EINVAL) {
1307 * Dell Precision Workstation 410, 610 come here.
1309 printk(KERN_ERR PREFIX
1310 "Invalid BIOS MADT, disabling ACPI\n");
1315 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1316 * In the event an MPS table was found, forget it.
1317 * Boot with "acpi=off" to use MPS on such a system.
1319 if (smp_found_config) {
1320 printk(KERN_WARNING PREFIX
1321 "No APIC-table, disabling MPS\n");
1322 smp_found_config = 0;
1327 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1328 * processors, where MPS only supports physical.
1330 if (acpi_lapic && acpi_ioapic)
1331 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1333 else if (acpi_lapic)
1334 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1335 "configuration information\n");
1340 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1343 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1350 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1353 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1360 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1363 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1367 "Warning: DMI blacklist says broken, but acpi forced\n");
1373 * Limit ACPI to CPU enumeration for HT
1375 static int __init force_acpi_ht(const struct dmi_system_id *d)
1378 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
1384 "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
1390 * Force ignoring BIOS IRQ0 pin2 override
1392 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1395 * The ati_ixp4x0_rev() early PCI quirk should have set
1396 * the acpi_skip_timer_override flag already:
1398 if (!acpi_skip_timer_override) {
1399 WARN(1, KERN_ERR "ati_ixp4x0 quirk not complete.\n");
1400 pr_notice("%s detected: Ignoring BIOS IRQ0 pin2 override\n",
1402 acpi_skip_timer_override = 1;
1408 * If your system is blacklisted here, but you find that acpi=force
1409 * works for you, please contact linux-acpi@vger.kernel.org
1411 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1413 * Boxes that need ACPI disabled
1416 .callback = dmi_disable_acpi,
1417 .ident = "IBM Thinkpad",
1419 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1420 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1425 * Boxes that need acpi=ht
1428 .callback = force_acpi_ht,
1429 .ident = "FSC Primergy T850",
1431 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1432 DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1436 .callback = force_acpi_ht,
1437 .ident = "HP VISUALIZE NT Workstation",
1439 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1440 DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1444 .callback = force_acpi_ht,
1445 .ident = "Compaq Workstation W8000",
1447 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1448 DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1452 .callback = force_acpi_ht,
1453 .ident = "ASUS P2B-DS",
1455 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1456 DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1460 .callback = force_acpi_ht,
1461 .ident = "ASUS CUR-DLS",
1463 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1464 DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1468 .callback = force_acpi_ht,
1469 .ident = "ABIT i440BX-W83977",
1471 DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1472 DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1476 .callback = force_acpi_ht,
1477 .ident = "IBM Bladecenter",
1479 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1480 DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1484 .callback = force_acpi_ht,
1485 .ident = "IBM eServer xSeries 360",
1487 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1488 DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1492 .callback = force_acpi_ht,
1493 .ident = "IBM eserver xSeries 330",
1495 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1496 DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1500 .callback = force_acpi_ht,
1501 .ident = "IBM eserver xSeries 440",
1503 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1504 DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1509 * Boxes that need ACPI PCI IRQ routing disabled
1512 .callback = disable_acpi_irq,
1513 .ident = "ASUS A7V",
1515 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1516 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1517 /* newer BIOS, Revision 1011, does work */
1518 DMI_MATCH(DMI_BIOS_VERSION,
1519 "ASUS A7V ACPI BIOS Revision 1007"),
1524 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1525 * for LPC bridge, which is needed for the PCI
1526 * interrupt links to work. DSDT fix is in bug 5966.
1527 * 2645, 2646 model numbers are shared with 600/600E/600X
1529 .callback = disable_acpi_irq,
1530 .ident = "IBM Thinkpad 600 Series 2645",
1532 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1533 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1537 .callback = disable_acpi_irq,
1538 .ident = "IBM Thinkpad 600 Series 2646",
1540 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1541 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1545 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1548 .callback = disable_acpi_pci,
1549 .ident = "ASUS PR-DLS",
1551 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1552 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1553 DMI_MATCH(DMI_BIOS_VERSION,
1554 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1555 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1559 .callback = disable_acpi_pci,
1560 .ident = "Acer TravelMate 36x Laptop",
1562 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1563 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1569 /* second table for DMI checks that should run after early-quirks */
1570 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1572 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1573 * which includes some code which overrides all temperature
1574 * trip points to 16C if the INTIN2 input of the I/O APIC
1575 * is enabled. This input is incorrectly designated the
1576 * ISA IRQ 0 via an interrupt source override even though
1577 * it is wired to the output of the master 8259A and INTIN0
1578 * is not connected at all. Force ignoring BIOS IRQ0 pin2
1579 * override in that cases.
1582 .callback = dmi_ignore_irq0_timer_override,
1583 .ident = "HP nx6115 laptop",
1585 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1586 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1590 .callback = dmi_ignore_irq0_timer_override,
1591 .ident = "HP NX6125 laptop",
1593 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1594 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1598 .callback = dmi_ignore_irq0_timer_override,
1599 .ident = "HP NX6325 laptop",
1601 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1602 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1606 .callback = dmi_ignore_irq0_timer_override,
1607 .ident = "HP 6715b laptop",
1609 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1610 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1617 * acpi_boot_table_init() and acpi_boot_init()
1618 * called from setup_arch(), always.
1619 * 1. checksums all tables
1620 * 2. enumerates lapics
1621 * 3. enumerates io-apics
1623 * acpi_table_init() is separate to allow reading SRAT without
1624 * other side effects.
1626 * side effects of acpi_boot_init:
1627 * acpi_lapic = 1 if LAPIC found
1628 * acpi_ioapic = 1 if IOAPIC found
1629 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1630 * if acpi_blacklisted() acpi_disabled = 1;
1631 * acpi_irq_model=...
1634 * return value: (currently ignored)
1639 int __init acpi_boot_table_init(void)
1643 dmi_check_system(acpi_dmi_table);
1646 * If acpi_disabled, bail out
1647 * One exception: acpi=ht continues far enough to enumerate LAPICs
1649 if (acpi_disabled && !acpi_ht)
1653 * Initialize the ACPI boot-time table parser.
1655 error = acpi_table_init();
1661 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1664 * blacklist may disable ACPI entirely
1666 error = acpi_blacklisted();
1669 printk(KERN_WARNING PREFIX "acpi=force override\n");
1671 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1680 int __init early_acpi_boot_init(void)
1683 * If acpi_disabled, bail out
1684 * One exception: acpi=ht continues far enough to enumerate LAPICs
1686 if (acpi_disabled && !acpi_ht)
1690 * Process the Multiple APIC Description Table (MADT), if present
1692 early_acpi_process_madt();
1697 int __init acpi_boot_init(void)
1699 /* those are executed after early-quirks are executed */
1700 dmi_check_system(acpi_dmi_table_late);
1703 * If acpi_disabled, bail out
1704 * One exception: acpi=ht continues far enough to enumerate LAPICs
1706 if (acpi_disabled && !acpi_ht)
1709 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1712 * set sci_int and PM timer address
1714 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1717 * Process the Multiple APIC Description Table (MADT), if present
1719 acpi_process_madt();
1721 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1726 static int __init parse_acpi(char *arg)
1731 /* "acpi=off" disables both ACPI table parsing and interpreter */
1732 if (strcmp(arg, "off") == 0) {
1735 /* acpi=force to over-ride black-list */
1736 else if (strcmp(arg, "force") == 0) {
1741 /* acpi=strict disables out-of-spec workarounds */
1742 else if (strcmp(arg, "strict") == 0) {
1745 /* Limit ACPI just to boot-time to enable HT */
1746 else if (strcmp(arg, "ht") == 0) {
1751 /* acpi=rsdt use RSDT instead of XSDT */
1752 else if (strcmp(arg, "rsdt") == 0) {
1753 acpi_rsdt_forced = 1;
1755 /* "acpi=noirq" disables ACPI interrupt routing */
1756 else if (strcmp(arg, "noirq") == 0) {
1759 /* Core will printk when we return error. */
1764 early_param("acpi", parse_acpi);
1766 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1767 static int __init parse_pci(char *arg)
1769 if (arg && strcmp(arg, "noacpi") == 0)
1773 early_param("pci", parse_pci);
1775 int __init acpi_mps_check(void)
1777 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1778 /* mptable code is not built-in*/
1779 if (acpi_disabled || acpi_noirq) {
1780 printk(KERN_WARNING "MPS support code is not built-in.\n"
1781 "Using acpi=off or acpi=noirq or pci=noacpi "
1782 "may have problem\n");
1789 #ifdef CONFIG_X86_IO_APIC
1790 static int __init parse_acpi_skip_timer_override(char *arg)
1792 acpi_skip_timer_override = 1;
1795 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1797 static int __init parse_acpi_use_timer_override(char *arg)
1799 acpi_use_timer_override = 1;
1802 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1803 #endif /* CONFIG_X86_IO_APIC */
1805 static int __init setup_acpi_sci(char *s)
1809 if (!strcmp(s, "edge"))
1810 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1811 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1812 else if (!strcmp(s, "level"))
1813 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1814 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1815 else if (!strcmp(s, "high"))
1816 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1817 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1818 else if (!strcmp(s, "low"))
1819 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1820 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1825 early_param("acpi_sci", setup_acpi_sci);
1827 int __acpi_acquire_global_lock(unsigned int *lock)
1829 unsigned int old, new, val;
1832 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1833 val = cmpxchg(lock, old, new);
1834 } while (unlikely (val != old));
1835 return (new < 3) ? -1 : 0;
1838 int __acpi_release_global_lock(unsigned int *lock)
1840 unsigned int old, new, val;
1844 val = cmpxchg(lock, old, new);
1845 } while (unlikely (val != old));