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)
245 unsigned int ver = 0;
253 if (boot_cpu_physical_apicid != -1U)
254 ver = apic_version[boot_cpu_physical_apicid];
257 generic_processor_info(id, ver);
261 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
263 struct acpi_madt_local_apic *processor = NULL;
265 processor = (struct acpi_madt_local_apic *)header;
267 if (BAD_MADT_ENTRY(processor, end))
270 acpi_table_print_madt_entry(header);
273 * We need to register disabled CPU as well to permit
274 * counting disabled CPUs. This allows us to size
275 * cpus_possible_map more accurately, to permit
276 * to not preallocating memory for all NR_CPUS
277 * when we use CPU hotplug.
279 acpi_register_lapic(processor->id, /* APIC ID */
280 processor->lapic_flags & ACPI_MADT_ENABLED);
286 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
288 struct acpi_madt_local_sapic *processor = NULL;
290 processor = (struct acpi_madt_local_sapic *)header;
292 if (BAD_MADT_ENTRY(processor, end))
295 acpi_table_print_madt_entry(header);
297 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
298 processor->lapic_flags & ACPI_MADT_ENABLED);
304 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
305 const unsigned long end)
307 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
309 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
311 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
314 acpi_lapic_addr = lapic_addr_ovr->address;
320 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
322 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
324 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
326 if (BAD_MADT_ENTRY(lapic_nmi, end))
329 acpi_table_print_madt_entry(header);
331 if (lapic_nmi->lint != 1)
332 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
337 #endif /*CONFIG_X86_LOCAL_APIC */
339 #ifdef CONFIG_X86_IO_APIC
342 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
344 struct acpi_madt_io_apic *ioapic = NULL;
346 ioapic = (struct acpi_madt_io_apic *)header;
348 if (BAD_MADT_ENTRY(ioapic, end))
351 acpi_table_print_madt_entry(header);
353 mp_register_ioapic(ioapic->id,
354 ioapic->address, ioapic->global_irq_base);
360 * Parse Interrupt Source Override for the ACPI SCI
362 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
364 if (trigger == 0) /* compatible SCI trigger is level */
367 if (polarity == 0) /* compatible SCI polarity is low */
370 /* Command-line over-ride via acpi_sci= */
371 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
372 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
374 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
375 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
378 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
379 * If GSI is < 16, this will update its flags,
380 * else it will create a new mp_irqs[] entry.
382 mp_override_legacy_irq(gsi, polarity, trigger, gsi);
385 * stash over-ride to indicate we've been here
386 * and for later update of acpi_gbl_FADT
388 acpi_sci_override_gsi = gsi;
393 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
394 const unsigned long end)
396 struct acpi_madt_interrupt_override *intsrc = NULL;
398 intsrc = (struct acpi_madt_interrupt_override *)header;
400 if (BAD_MADT_ENTRY(intsrc, end))
403 acpi_table_print_madt_entry(header);
405 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
406 acpi_sci_ioapic_setup(intsrc->global_irq,
407 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
408 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
412 if (acpi_skip_timer_override &&
413 intsrc->source_irq == 0 && intsrc->global_irq == 2) {
414 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
418 mp_override_legacy_irq(intsrc->source_irq,
419 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
420 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
427 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
429 struct acpi_madt_nmi_source *nmi_src = NULL;
431 nmi_src = (struct acpi_madt_nmi_source *)header;
433 if (BAD_MADT_ENTRY(nmi_src, end))
436 acpi_table_print_madt_entry(header);
438 /* TBD: Support nimsrc entries? */
443 #endif /* CONFIG_X86_IO_APIC */
446 * acpi_pic_sci_set_trigger()
448 * use ELCR to set PIC-mode trigger type for SCI
450 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
451 * it may require Edge Trigger -- use "acpi_sci=edge"
453 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
454 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
455 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
456 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
459 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
461 unsigned int mask = 1 << irq;
462 unsigned int old, new;
464 /* Real old ELCR mask */
465 old = inb(0x4d0) | (inb(0x4d1) << 8);
468 * If we use ACPI to set PCI IRQs, then we should clear ELCR
469 * since we will set it correctly as we enable the PCI irq
472 new = acpi_noirq ? old : 0;
475 * Update SCI information in the ELCR, it isn't in the PCI
479 case 1: /* Edge - clear */
482 case 3: /* Level - set */
490 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
492 outb(new >> 8, 0x4d1);
495 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
502 * success: return IRQ number (>=0)
503 * failure: return < 0
505 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
508 unsigned int plat_gsi = gsi;
512 * Make sure all (legacy) PCI IRQs are set as level-triggered.
514 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
515 extern void eisa_set_level_irq(unsigned int irq);
517 if (triggering == ACPI_LEVEL_SENSITIVE)
518 eisa_set_level_irq(gsi);
522 #ifdef CONFIG_X86_IO_APIC
523 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
524 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
527 acpi_gsi_to_irq(plat_gsi, &irq);
532 * ACPI based hotplug support for CPU
534 #ifdef CONFIG_ACPI_HOTPLUG_CPU
536 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
538 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
539 union acpi_object *obj;
540 struct acpi_madt_local_apic *lapic;
541 cpumask_t tmp_map, new_map;
545 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
548 if (!buffer.length || !buffer.pointer)
551 obj = buffer.pointer;
552 if (obj->type != ACPI_TYPE_BUFFER ||
553 obj->buffer.length < sizeof(*lapic)) {
554 kfree(buffer.pointer);
558 lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
560 if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
561 !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
562 kfree(buffer.pointer);
568 kfree(buffer.pointer);
569 buffer.length = ACPI_ALLOCATE_BUFFER;
570 buffer.pointer = NULL;
572 tmp_map = cpu_present_map;
573 acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
576 * If mp_register_lapic successfully generates a new logical cpu
577 * number, then the following will get us exactly what was mapped
579 cpus_andnot(new_map, cpu_present_map, tmp_map);
580 if (cpus_empty(new_map)) {
581 printk ("Unable to map lapic to logical cpu number\n");
585 cpu = first_cpu(new_map);
591 /* wrapper to silence section mismatch warning */
592 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
594 return _acpi_map_lsapic(handle, pcpu);
596 EXPORT_SYMBOL(acpi_map_lsapic);
598 int acpi_unmap_lsapic(int cpu)
600 per_cpu(x86_cpu_to_apicid, cpu) = -1;
601 cpu_clear(cpu, cpu_present_map);
607 EXPORT_SYMBOL(acpi_unmap_lsapic);
608 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
610 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
616 EXPORT_SYMBOL(acpi_register_ioapic);
618 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
624 EXPORT_SYMBOL(acpi_unregister_ioapic);
626 static int __init acpi_parse_sbf(struct acpi_table_header *table)
628 struct acpi_table_boot *sb;
630 sb = (struct acpi_table_boot *)table;
632 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
636 sbf_port = sb->cmos_index; /* Save CMOS port */
641 #ifdef CONFIG_HPET_TIMER
642 #include <asm/hpet.h>
644 static struct __initdata resource *hpet_res;
646 static int __init acpi_parse_hpet(struct acpi_table_header *table)
648 struct acpi_table_hpet *hpet_tbl;
650 hpet_tbl = (struct acpi_table_hpet *)table;
652 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
656 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
657 printk(KERN_WARNING PREFIX "HPET timers must be located in "
662 hpet_address = hpet_tbl->address.address;
665 * Some broken BIOSes advertise HPET at 0x0. We really do not
666 * want to allocate a resource there.
669 printk(KERN_WARNING PREFIX
670 "HPET id: %#x base: %#lx is invalid\n",
671 hpet_tbl->id, hpet_address);
676 * Some even more broken BIOSes advertise HPET at
677 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
680 if (hpet_address == 0xfed0000000000000UL) {
681 if (!hpet_force_user) {
682 printk(KERN_WARNING PREFIX "HPET id: %#x "
683 "base: 0xfed0000000000000 is bogus\n "
684 "try hpet=force on the kernel command line to "
685 "fix it up to 0xfed00000.\n", hpet_tbl->id);
689 printk(KERN_WARNING PREFIX
690 "HPET id: %#x base: 0xfed0000000000000 fixed up "
691 "to 0xfed00000.\n", hpet_tbl->id);
695 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
696 hpet_tbl->id, hpet_address);
699 * Allocate and initialize the HPET firmware resource for adding into
700 * the resource tree during the lateinit timeframe.
702 #define HPET_RESOURCE_NAME_SIZE 9
703 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
705 hpet_res->name = (void *)&hpet_res[1];
706 hpet_res->flags = IORESOURCE_MEM;
707 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
710 hpet_res->start = hpet_address;
711 hpet_res->end = hpet_address + (1 * 1024) - 1;
717 * hpet_insert_resource inserts the HPET resources used into the resource
720 static __init int hpet_insert_resource(void)
725 return insert_resource(&iomem_resource, hpet_res);
728 late_initcall(hpet_insert_resource);
731 #define acpi_parse_hpet NULL
734 static int __init acpi_parse_fadt(struct acpi_table_header *table)
737 #ifdef CONFIG_X86_PM_TIMER
738 /* detect the location of the ACPI PM Timer */
739 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
741 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
742 ACPI_ADR_SPACE_SYSTEM_IO)
745 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
747 * "X" fields are optional extensions to the original V1.0
748 * fields, so we must selectively expand V1.0 fields if the
749 * corresponding X field is zero.
752 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
755 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
758 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
764 #ifdef CONFIG_X86_LOCAL_APIC
766 * Parse LAPIC entries in MADT
767 * returns 0 on success, < 0 on error
770 static void __init acpi_register_lapic_address(unsigned long address)
772 mp_lapic_addr = address;
774 set_fixmap_nocache(FIX_APIC_BASE, address);
775 if (boot_cpu_physical_apicid == -1U) {
776 boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
778 apic_version[boot_cpu_physical_apicid] =
779 GET_APIC_VERSION(apic_read(APIC_LVR));
784 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
792 * Note that the LAPIC address is obtained from the MADT (32-bit value)
793 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
797 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
798 acpi_parse_lapic_addr_ovr, 0);
800 printk(KERN_ERR PREFIX
801 "Error parsing LAPIC address override entry\n");
805 acpi_register_lapic_address(acpi_lapic_addr);
810 static int __init acpi_parse_madt_lapic_entries(void)
818 * Note that the LAPIC address is obtained from the MADT (32-bit value)
819 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
823 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
824 acpi_parse_lapic_addr_ovr, 0);
826 printk(KERN_ERR PREFIX
827 "Error parsing LAPIC address override entry\n");
831 acpi_register_lapic_address(acpi_lapic_addr);
833 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
834 acpi_parse_sapic, MAX_APICS);
837 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
838 acpi_parse_lapic, MAX_APICS);
840 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
841 /* TBD: Cleanup to allow fallback to MPS */
843 } else if (count < 0) {
844 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
845 /* TBD: Cleanup to allow fallback to MPS */
850 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
852 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
853 /* TBD: Cleanup to allow fallback to MPS */
858 #endif /* CONFIG_X86_LOCAL_APIC */
860 #ifdef CONFIG_X86_IO_APIC
863 #ifdef CONFIG_X86_ES7000
864 extern int es7000_plat;
871 DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
872 } mp_ioapic_routing[MAX_IO_APICS];
874 static int mp_find_ioapic(int gsi)
878 /* Find the IOAPIC that manages this GSI. */
879 for (i = 0; i < nr_ioapics; i++) {
880 if ((gsi >= mp_ioapic_routing[i].gsi_base)
881 && (gsi <= mp_ioapic_routing[i].gsi_end))
885 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
889 static u8 __init uniq_ioapic_id(u8 id)
892 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
893 !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
894 return io_apic_get_unique_id(nr_ioapics, id);
899 DECLARE_BITMAP(used, 256);
900 bitmap_zero(used, 256);
901 for (i = 0; i < nr_ioapics; i++) {
902 struct mp_config_ioapic *ia = &mp_ioapics[i];
903 __set_bit(ia->mp_apicid, used);
905 if (!test_bit(id, used))
907 return find_first_zero_bit(used, 256);
911 static int bad_ioapic(unsigned long address)
913 if (nr_ioapics >= MAX_IO_APICS) {
914 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
915 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
916 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
919 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
920 " found in table, skipping!\n");
926 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
930 if (bad_ioapic(address))
935 mp_ioapics[idx].mp_type = MP_IOAPIC;
936 mp_ioapics[idx].mp_flags = MPC_APIC_USABLE;
937 mp_ioapics[idx].mp_apicaddr = address;
939 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
940 mp_ioapics[idx].mp_apicid = uniq_ioapic_id(id);
942 mp_ioapics[idx].mp_apicver = io_apic_get_version(idx);
944 mp_ioapics[idx].mp_apicver = 0;
947 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
948 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
950 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mp_apicid;
951 mp_ioapic_routing[idx].gsi_base = gsi_base;
952 mp_ioapic_routing[idx].gsi_end = gsi_base +
953 io_apic_get_redir_entries(idx);
955 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, "
956 "GSI %d-%d\n", idx, mp_ioapics[idx].mp_apicid,
957 mp_ioapics[idx].mp_apicver, mp_ioapics[idx].mp_apicaddr,
958 mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end);
963 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
969 * Convert 'gsi' to 'ioapic.pin'.
971 ioapic = mp_find_ioapic(gsi);
974 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
977 * TBD: This check is for faulty timer entries, where the override
978 * erroneously sets the trigger to level, resulting in a HUGE
979 * increase of timer interrupts!
981 if ((bus_irq == 0) && (trigger == 3))
984 mp_irqs[mp_irq_entries].mp_type = MP_INTSRC;
985 mp_irqs[mp_irq_entries].mp_irqtype = mp_INT;
986 mp_irqs[mp_irq_entries].mp_irqflag = (trigger << 2) | polarity;
987 mp_irqs[mp_irq_entries].mp_srcbus = MP_ISA_BUS;
988 mp_irqs[mp_irq_entries].mp_srcbusirq = bus_irq; /* IRQ */
989 mp_irqs[mp_irq_entries].mp_dstapic =
990 mp_ioapics[ioapic].mp_apicid; /* APIC ID */
991 mp_irqs[mp_irq_entries].mp_dstirq = pin; /* INTIN# */
993 if (++mp_irq_entries == MAX_IRQ_SOURCES)
994 panic("Max # of irq sources exceeded!!\n");
998 void __init mp_config_acpi_legacy_irqs(void)
1003 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
1005 * Fabricate the legacy ISA bus (bus #31).
1007 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1009 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1010 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
1012 #ifdef CONFIG_X86_ES7000
1014 * Older generations of ES7000 have no legacy identity mappings
1016 if (es7000_plat == 1)
1021 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1023 ioapic = mp_find_ioapic(0);
1028 * Use the default configuration for the IRQs 0-15. Unless
1029 * overridden by (MADT) interrupt source override entries.
1031 for (i = 0; i < 16; i++) {
1034 mp_irqs[mp_irq_entries].mp_type = MP_INTSRC;
1035 mp_irqs[mp_irq_entries].mp_irqflag = 0; /* Conforming */
1036 mp_irqs[mp_irq_entries].mp_srcbus = MP_ISA_BUS;
1037 mp_irqs[mp_irq_entries].mp_dstapic = mp_ioapics[ioapic].mp_apicid;
1039 for (idx = 0; idx < mp_irq_entries; idx++) {
1040 struct mp_config_intsrc *irq = mp_irqs + idx;
1042 /* Do we already have a mapping for this ISA IRQ? */
1043 if (irq->mp_srcbus == MP_ISA_BUS
1044 && irq->mp_srcbusirq == i)
1047 /* Do we already have a mapping for this IOAPIC pin */
1048 if ((irq->mp_dstapic ==
1049 mp_irqs[mp_irq_entries].mp_dstapic) &&
1050 (irq->mp_dstirq == i))
1054 if (idx != mp_irq_entries) {
1055 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1056 continue; /* IRQ already used */
1059 mp_irqs[mp_irq_entries].mp_irqtype = mp_INT;
1060 mp_irqs[mp_irq_entries].mp_srcbusirq = i; /* Identity mapped */
1061 mp_irqs[mp_irq_entries].mp_dstirq = i;
1063 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1064 panic("Max # of irq sources exceeded!!\n");
1068 int mp_register_gsi(u32 gsi, int triggering, int polarity)
1072 #ifdef CONFIG_X86_32
1073 #define MAX_GSI_NUM 4096
1074 #define IRQ_COMPRESSION_START 64
1076 static int pci_irq = IRQ_COMPRESSION_START;
1078 * Mapping between Global System Interrupts, which
1079 * represent all possible interrupts, and IRQs
1080 * assigned to actual devices.
1082 static int gsi_to_irq[MAX_GSI_NUM];
1085 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
1089 /* Don't set up the ACPI SCI because it's already set up */
1090 if (acpi_gbl_FADT.sci_interrupt == gsi)
1093 ioapic = mp_find_ioapic(gsi);
1095 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1099 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1101 #ifdef CONFIG_X86_32
1102 if (ioapic_renumber_irq)
1103 gsi = ioapic_renumber_irq(ioapic, gsi);
1107 * Avoid pin reprogramming. PRTs typically include entries
1108 * with redundant pin->gsi mappings (but unique PCI devices);
1109 * we only program the IOAPIC on the first.
1111 if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
1112 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1113 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1117 if (test_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed)) {
1118 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1119 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1120 #ifdef CONFIG_X86_32
1121 return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]);
1127 set_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed);
1128 #ifdef CONFIG_X86_32
1130 * For GSI >= 64, use IRQ compression
1132 if ((gsi >= IRQ_COMPRESSION_START)
1133 && (triggering == ACPI_LEVEL_SENSITIVE)) {
1135 * For PCI devices assign IRQs in order, avoiding gaps
1136 * due to unused I/O APIC pins.
1139 if (gsi < MAX_GSI_NUM) {
1141 * Retain the VIA chipset work-around (gsi > 15), but
1142 * avoid a problem where the 8254 timer (IRQ0) is setup
1143 * via an override (so it's not on pin 0 of the ioapic),
1144 * and at the same time, the pin 0 interrupt is a PCI
1145 * type. The gsi > 15 test could cause these two pins
1146 * to be shared as IRQ0, and they are not shareable.
1147 * So test for this condition, and if necessary, avoid
1148 * the pin collision.
1152 * Don't assign IRQ used by ACPI SCI
1154 if (gsi == acpi_gbl_FADT.sci_interrupt)
1156 gsi_to_irq[irq] = gsi;
1158 printk(KERN_ERR "GSI %u is too high\n", gsi);
1163 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1164 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
1165 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1169 int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
1170 u32 gsi, int triggering, int polarity)
1172 struct mpc_config_intsrc intsrc;
1175 /* print the entry should happen on mptable identically */
1176 intsrc.mpc_type = MP_INTSRC;
1177 intsrc.mpc_irqtype = mp_INT;
1178 intsrc.mpc_irqflag = (triggering == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
1179 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
1180 intsrc.mpc_srcbus = number;
1181 intsrc.mpc_srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
1182 ioapic = mp_find_ioapic(gsi);
1183 intsrc.mpc_dstapic = mp_ioapic_routing[ioapic].apic_id;
1184 intsrc.mpc_dstirq = gsi - mp_ioapic_routing[ioapic].gsi_base;
1186 MP_intsrc_info(&intsrc);
1192 * Parse IOAPIC related entries in MADT
1193 * returns 0 on success, < 0 on error
1195 static int __init acpi_parse_madt_ioapic_entries(void)
1200 * ACPI interpreter is required to complete interrupt setup,
1201 * so if it is off, don't enumerate the io-apics with ACPI.
1202 * If MPS is present, it will handle them,
1203 * otherwise the system will stay in PIC mode
1205 if (acpi_disabled || acpi_noirq) {
1213 * if "noapic" boot option, don't look for IO-APICs
1215 if (skip_ioapic_setup) {
1216 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1217 "due to 'noapic' option.\n");
1222 acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1225 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1227 } else if (count < 0) {
1228 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1233 acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
1236 printk(KERN_ERR PREFIX
1237 "Error parsing interrupt source overrides entry\n");
1238 /* TBD: Cleanup to allow fallback to MPS */
1243 * If BIOS did not supply an INT_SRC_OVR for the SCI
1244 * pretend we got one so we can set the SCI flags.
1246 if (!acpi_sci_override_gsi)
1247 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
1249 /* Fill in identity legacy mapings where no override */
1250 mp_config_acpi_legacy_irqs();
1253 acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
1256 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1257 /* TBD: Cleanup to allow fallback to MPS */
1264 static inline int acpi_parse_madt_ioapic_entries(void)
1268 #endif /* !CONFIG_X86_IO_APIC */
1270 static void __init early_acpi_process_madt(void)
1272 #ifdef CONFIG_X86_LOCAL_APIC
1275 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1278 * Parse MADT LAPIC entries
1280 error = early_acpi_parse_madt_lapic_addr_ovr();
1283 smp_found_config = 1;
1285 if (error == -EINVAL) {
1287 * Dell Precision Workstation 410, 610 come here.
1289 printk(KERN_ERR PREFIX
1290 "Invalid BIOS MADT, disabling ACPI\n");
1297 static void __init acpi_process_madt(void)
1299 #ifdef CONFIG_X86_LOCAL_APIC
1302 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1305 * Parse MADT LAPIC entries
1307 error = acpi_parse_madt_lapic_entries();
1311 #ifdef CONFIG_X86_GENERICARCH
1312 generic_bigsmp_probe();
1315 * Parse MADT IO-APIC entries
1317 error = acpi_parse_madt_ioapic_entries();
1319 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
1320 acpi_irq_balance_set(NULL);
1323 smp_found_config = 1;
1324 setup_apic_routing();
1327 if (error == -EINVAL) {
1329 * Dell Precision Workstation 410, 610 come here.
1331 printk(KERN_ERR PREFIX
1332 "Invalid BIOS MADT, disabling ACPI\n");
1342 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1345 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1352 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1355 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1362 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1365 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1369 "Warning: DMI blacklist says broken, but acpi forced\n");
1375 * Limit ACPI to CPU enumeration for HT
1377 static int __init force_acpi_ht(const struct dmi_system_id *d)
1380 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
1386 "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
1392 * If your system is blacklisted here, but you find that acpi=force
1393 * works for you, please contact acpi-devel@sourceforge.net
1395 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1397 * Boxes that need ACPI disabled
1400 .callback = dmi_disable_acpi,
1401 .ident = "IBM Thinkpad",
1403 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1404 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1409 * Boxes that need acpi=ht
1412 .callback = force_acpi_ht,
1413 .ident = "FSC Primergy T850",
1415 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1416 DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1420 .callback = force_acpi_ht,
1421 .ident = "HP VISUALIZE NT Workstation",
1423 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1424 DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1428 .callback = force_acpi_ht,
1429 .ident = "Compaq Workstation W8000",
1431 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1432 DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1436 .callback = force_acpi_ht,
1437 .ident = "ASUS P4B266",
1439 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1440 DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1444 .callback = force_acpi_ht,
1445 .ident = "ASUS P2B-DS",
1447 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1448 DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1452 .callback = force_acpi_ht,
1453 .ident = "ASUS CUR-DLS",
1455 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1456 DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1460 .callback = force_acpi_ht,
1461 .ident = "ABIT i440BX-W83977",
1463 DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1464 DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1468 .callback = force_acpi_ht,
1469 .ident = "IBM Bladecenter",
1471 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1472 DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1476 .callback = force_acpi_ht,
1477 .ident = "IBM eServer xSeries 360",
1479 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1480 DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1484 .callback = force_acpi_ht,
1485 .ident = "IBM eserver xSeries 330",
1487 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1488 DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1492 .callback = force_acpi_ht,
1493 .ident = "IBM eserver xSeries 440",
1495 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1496 DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1501 * Boxes that need ACPI PCI IRQ routing disabled
1504 .callback = disable_acpi_irq,
1505 .ident = "ASUS A7V",
1507 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1508 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1509 /* newer BIOS, Revision 1011, does work */
1510 DMI_MATCH(DMI_BIOS_VERSION,
1511 "ASUS A7V ACPI BIOS Revision 1007"),
1516 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1517 * for LPC bridge, which is needed for the PCI
1518 * interrupt links to work. DSDT fix is in bug 5966.
1519 * 2645, 2646 model numbers are shared with 600/600E/600X
1521 .callback = disable_acpi_irq,
1522 .ident = "IBM Thinkpad 600 Series 2645",
1524 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1525 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1529 .callback = disable_acpi_irq,
1530 .ident = "IBM Thinkpad 600 Series 2646",
1532 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1533 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1537 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1540 .callback = disable_acpi_pci,
1541 .ident = "ASUS PR-DLS",
1543 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1544 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1545 DMI_MATCH(DMI_BIOS_VERSION,
1546 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1547 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1551 .callback = disable_acpi_pci,
1552 .ident = "Acer TravelMate 36x Laptop",
1554 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1555 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1561 #endif /* __i386__ */
1564 * acpi_boot_table_init() and acpi_boot_init()
1565 * called from setup_arch(), always.
1566 * 1. checksums all tables
1567 * 2. enumerates lapics
1568 * 3. enumerates io-apics
1570 * acpi_table_init() is separate to allow reading SRAT without
1571 * other side effects.
1573 * side effects of acpi_boot_init:
1574 * acpi_lapic = 1 if LAPIC found
1575 * acpi_ioapic = 1 if IOAPIC found
1576 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1577 * if acpi_blacklisted() acpi_disabled = 1;
1578 * acpi_irq_model=...
1581 * return value: (currently ignored)
1586 int __init acpi_boot_table_init(void)
1591 dmi_check_system(acpi_dmi_table);
1595 * If acpi_disabled, bail out
1596 * One exception: acpi=ht continues far enough to enumerate LAPICs
1598 if (acpi_disabled && !acpi_ht)
1602 * Initialize the ACPI boot-time table parser.
1604 error = acpi_table_init();
1610 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1613 * blacklist may disable ACPI entirely
1615 error = acpi_blacklisted();
1618 printk(KERN_WARNING PREFIX "acpi=force override\n");
1620 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1629 int __init early_acpi_boot_init(void)
1632 * If acpi_disabled, bail out
1633 * One exception: acpi=ht continues far enough to enumerate LAPICs
1635 if (acpi_disabled && !acpi_ht)
1639 * Process the Multiple APIC Description Table (MADT), if present
1641 early_acpi_process_madt();
1646 int __init acpi_boot_init(void)
1649 * If acpi_disabled, bail out
1650 * One exception: acpi=ht continues far enough to enumerate LAPICs
1652 if (acpi_disabled && !acpi_ht)
1655 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1658 * set sci_int and PM timer address
1660 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1663 * Process the Multiple APIC Description Table (MADT), if present
1665 acpi_process_madt();
1667 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1672 static int __init parse_acpi(char *arg)
1677 /* "acpi=off" disables both ACPI table parsing and interpreter */
1678 if (strcmp(arg, "off") == 0) {
1681 /* acpi=force to over-ride black-list */
1682 else if (strcmp(arg, "force") == 0) {
1687 /* acpi=strict disables out-of-spec workarounds */
1688 else if (strcmp(arg, "strict") == 0) {
1691 /* Limit ACPI just to boot-time to enable HT */
1692 else if (strcmp(arg, "ht") == 0) {
1697 /* "acpi=noirq" disables ACPI interrupt routing */
1698 else if (strcmp(arg, "noirq") == 0) {
1701 /* Core will printk when we return error. */
1706 early_param("acpi", parse_acpi);
1708 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1709 static int __init parse_pci(char *arg)
1711 if (arg && strcmp(arg, "noacpi") == 0)
1715 early_param("pci", parse_pci);
1717 #ifdef CONFIG_X86_IO_APIC
1718 static int __init parse_acpi_skip_timer_override(char *arg)
1720 acpi_skip_timer_override = 1;
1723 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1725 static int __init parse_acpi_use_timer_override(char *arg)
1727 acpi_use_timer_override = 1;
1730 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1731 #endif /* CONFIG_X86_IO_APIC */
1733 static int __init setup_acpi_sci(char *s)
1737 if (!strcmp(s, "edge"))
1738 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1739 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1740 else if (!strcmp(s, "level"))
1741 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1742 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1743 else if (!strcmp(s, "high"))
1744 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1745 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1746 else if (!strcmp(s, "low"))
1747 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1748 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1753 early_param("acpi_sci", setup_acpi_sci);
1755 int __acpi_acquire_global_lock(unsigned int *lock)
1757 unsigned int old, new, val;
1760 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1761 val = cmpxchg(lock, old, new);
1762 } while (unlikely (val != old));
1763 return (new < 3) ? -1 : 0;
1766 int __acpi_release_global_lock(unsigned int *lock)
1768 unsigned int old, new, val;
1772 val = cmpxchg(lock, old, new);
1773 } while (unlikely (val != old));