1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * acpi.c - Architecture-Specific Low-Level ACPI Support
5 * Copyright (C) 1999 VA Linux Systems
6 * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
7 * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 * Copyright (C) 2000 Intel Corp.
10 * Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
11 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
12 * Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
13 * Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
14 * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
15 * Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/smp.h>
23 #include <linux/string.h>
24 #include <linux/types.h>
25 #include <linux/irq.h>
26 #include <linux/acpi.h>
27 #include <linux/efi.h>
28 #include <linux/mmzone.h>
29 #include <linux/nodemask.h>
30 #include <linux/slab.h>
31 #include <acpi/processor.h>
33 #include <asm/iosapic.h>
37 #include <asm/cyclone.h>
39 #define PREFIX "ACPI: "
42 unsigned int acpi_cpei_override;
43 unsigned int acpi_cpei_phys_cpuid;
45 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
47 /* Array to record platform interrupt vectors for generic interrupt routing. */
48 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
49 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
52 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
55 * Interrupt routing API for device drivers. Provides interrupt vector for
56 * a generic platform event. Currently only CPEI is implemented.
58 int acpi_request_vector(u32 int_type)
62 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
63 /* corrected platform error interrupt */
64 vector = platform_intr_list[int_type];
67 "acpi_request_vector(): invalid interrupt type\n");
71 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
76 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
80 /* --------------------------------------------------------------------------
81 Boot-time Table Parsing
82 -------------------------------------------------------------------------- */
84 static int available_cpus __initdata;
85 struct acpi_table_madt *acpi_madt __initdata;
89 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
90 const unsigned long end)
92 struct acpi_madt_local_apic_override *lapic;
94 lapic = (struct acpi_madt_local_apic_override *)header;
96 if (BAD_MADT_ENTRY(lapic, end))
100 iounmap(ipi_base_addr);
101 ipi_base_addr = ioremap(lapic->address, 0);
107 acpi_parse_lsapic(union acpi_subtable_headers *header, const unsigned long end)
109 struct acpi_madt_local_sapic *lsapic;
111 lsapic = (struct acpi_madt_local_sapic *)header;
113 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
115 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
117 smp_boot_data.cpu_phys_id[available_cpus] =
118 (lsapic->id << 8) | lsapic->eid;
128 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
130 struct acpi_madt_local_apic_nmi *lacpi_nmi;
132 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
134 if (BAD_MADT_ENTRY(lacpi_nmi, end))
137 /* TBD: Support lapic_nmi entries */
142 acpi_parse_iosapic(union acpi_subtable_headers * header, const unsigned long end)
144 struct acpi_madt_io_sapic *iosapic;
146 iosapic = (struct acpi_madt_io_sapic *)header;
148 if (BAD_MADT_ENTRY(iosapic, end))
151 return iosapic_init(iosapic->address, iosapic->global_irq_base);
154 static unsigned int __initdata acpi_madt_rev;
157 acpi_parse_plat_int_src(union acpi_subtable_headers * header,
158 const unsigned long end)
160 struct acpi_madt_interrupt_source *plintsrc;
163 plintsrc = (struct acpi_madt_interrupt_source *)header;
165 if (BAD_MADT_ENTRY(plintsrc, end))
169 * Get vector assignment for this interrupt, set attributes,
170 * and program the IOSAPIC routing table.
172 vector = iosapic_register_platform_intr(plintsrc->type,
173 plintsrc->global_irq,
174 plintsrc->io_sapic_vector,
177 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
178 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
179 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
180 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
181 ACPI_MADT_TRIGGER_EDGE) ?
182 IOSAPIC_EDGE : IOSAPIC_LEVEL);
184 platform_intr_list[plintsrc->type] = vector;
185 if (acpi_madt_rev > 1) {
186 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
190 * Save the physical id, so we can check when its being removed
192 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
197 #ifdef CONFIG_HOTPLUG_CPU
198 unsigned int can_cpei_retarget(void)
200 extern int cpe_vector;
201 extern unsigned int force_cpei_retarget;
204 * Only if CPEI is supported and the override flag
205 * is present, otherwise return that its re-targettable
206 * if we are in polling mode.
208 if (cpe_vector > 0) {
209 if (acpi_cpei_override || force_cpei_retarget)
217 unsigned int is_cpu_cpei_target(unsigned int cpu)
219 unsigned int logical_id;
221 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
223 if (logical_id == cpu)
229 void set_cpei_target_cpu(unsigned int cpu)
231 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
235 unsigned int get_cpei_target_cpu(void)
237 return acpi_cpei_phys_cpuid;
241 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
242 const unsigned long end)
244 struct acpi_madt_interrupt_override *p;
246 p = (struct acpi_madt_interrupt_override *)header;
248 if (BAD_MADT_ENTRY(p, end))
251 iosapic_override_isa_irq(p->source_irq, p->global_irq,
252 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
253 ACPI_MADT_POLARITY_ACTIVE_LOW) ?
254 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
255 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
256 ACPI_MADT_TRIGGER_LEVEL) ?
257 IOSAPIC_LEVEL : IOSAPIC_EDGE);
262 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
264 struct acpi_madt_nmi_source *nmi_src;
266 nmi_src = (struct acpi_madt_nmi_source *)header;
268 if (BAD_MADT_ENTRY(nmi_src, end))
271 /* TBD: Support nimsrc entries */
275 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
277 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
280 * Unfortunately ITC_DRIFT is not yet part of the
281 * official SAL spec, so the ITC_DRIFT bit is not
282 * set by the BIOS on this hardware.
284 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
290 static int __init acpi_parse_madt(struct acpi_table_header *table)
292 acpi_madt = (struct acpi_table_madt *)table;
294 acpi_madt_rev = acpi_madt->header.revision;
296 /* remember the value for reference after free_initmem() */
297 #ifdef CONFIG_ITANIUM
298 has_8259 = 1; /* Firmware on old Itanium systems is broken */
300 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
302 iosapic_system_init(has_8259);
304 /* Get base address of IPI Message Block */
306 if (acpi_madt->address)
307 ipi_base_addr = ioremap(acpi_madt->address, 0);
309 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
311 acpi_madt_oem_check(acpi_madt->header.oem_id,
312 acpi_madt->header.oem_table_id);
317 #ifdef CONFIG_ACPI_NUMA
321 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
323 static int __initdata srat_num_cpus; /* number of cpus */
324 static u32 pxm_flag[PXM_FLAG_LEN];
325 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
326 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
327 static struct acpi_table_slit __initdata *slit_table;
328 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
331 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
335 pxm = pa->proximity_domain_lo;
336 if (acpi_srat_revision >= 2)
337 pxm += pa->proximity_domain_hi[0] << 8;
342 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
346 pxm = ma->proximity_domain;
347 if (acpi_srat_revision <= 1)
354 * ACPI 2.0 SLIT (System Locality Information Table)
355 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
357 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
361 len = sizeof(struct acpi_table_header) + 8
362 + slit->locality_count * slit->locality_count;
363 if (slit->header.length != len) {
365 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
366 len, slit->header.length);
373 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
377 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
380 if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
381 printk_once(KERN_WARNING
382 "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
383 ARRAY_SIZE(node_cpuid));
386 pxm = get_processor_proximity_domain(pa);
388 /* record this node in proximity bitmap */
391 node_cpuid[srat_num_cpus].phys_id =
392 (pa->apic_id << 8) | (pa->local_sapic_eid);
393 /* nid should be overridden as logical node id later */
394 node_cpuid[srat_num_cpus].nid = pxm;
395 cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
400 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
402 unsigned long paddr, size;
404 struct node_memblk_s *p, *q, *pend;
406 pxm = get_memory_proximity_domain(ma);
408 /* fill node memory chunk structure */
409 paddr = ma->base_address;
412 /* Ignore disabled entries */
413 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
416 if (num_node_memblks >= NR_NODE_MEMBLKS) {
417 pr_err("NUMA: too many memblk ranges\n");
421 /* record this node in proximity bitmap */
424 /* Insertion sort based on base address */
425 pend = &node_memblk[num_node_memblks];
426 for (p = &node_memblk[0]; p < pend; p++) {
427 if (paddr < p->start_paddr)
431 for (q = pend - 1; q >= p; q--)
434 p->start_paddr = paddr;
441 void __init acpi_numa_fixup(void)
443 int i, j, node_from, node_to;
445 /* If there's no SRAT, fix the phys_id and mark node 0 online */
446 if (srat_num_cpus == 0) {
448 node_cpuid[0].phys_id = hard_smp_processor_id();
449 slit_distance(0, 0) = LOCAL_DISTANCE;
454 * MCD - This can probably be dropped now. No need for pxm ID to node ID
455 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
457 nodes_clear(node_online_map);
458 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
459 if (pxm_bit_test(i)) {
460 int nid = acpi_map_pxm_to_node(i);
461 node_set_online(nid);
465 /* set logical node id in memory chunk structure */
466 for (i = 0; i < num_node_memblks; i++)
467 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
469 /* assign memory bank numbers for each chunk on each node */
470 for_each_online_node(i) {
474 for (j = 0; j < num_node_memblks; j++)
475 if (node_memblk[j].nid == i)
476 node_memblk[j].bank = bank++;
479 /* set logical node id in cpu structure */
480 for_each_possible_early_cpu(i)
481 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
483 printk(KERN_INFO "Number of logical nodes in system = %d\n",
485 printk(KERN_INFO "Number of memory chunks in system = %d\n",
489 for (i = 0; i < MAX_NUMNODES; i++)
490 for (j = 0; j < MAX_NUMNODES; j++)
491 slit_distance(i, j) = i == j ?
492 LOCAL_DISTANCE : REMOTE_DISTANCE;
496 memset(numa_slit, -1, sizeof(numa_slit));
497 for (i = 0; i < slit_table->locality_count; i++) {
498 if (!pxm_bit_test(i))
500 node_from = pxm_to_node(i);
501 for (j = 0; j < slit_table->locality_count; j++) {
502 if (!pxm_bit_test(j))
504 node_to = pxm_to_node(j);
505 slit_distance(node_from, node_to) =
506 slit_table->entry[i * slit_table->locality_count + j];
511 printk("ACPI 2.0 SLIT locality table:\n");
512 for_each_online_node(i) {
513 for_each_online_node(j)
514 printk("%03d ", node_distance(i, j));
519 node_possible_map = node_online_map;
521 #endif /* CONFIG_ACPI_NUMA */
524 * success: return IRQ number (>=0)
525 * failure: return < 0
527 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
529 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
532 if (has_8259 && gsi < 16)
533 return isa_irq_to_vector(gsi);
535 return iosapic_register_intr(gsi,
537 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
540 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
543 EXPORT_SYMBOL_GPL(acpi_register_gsi);
545 void acpi_unregister_gsi(u32 gsi)
547 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
550 if (has_8259 && gsi < 16)
553 iosapic_unregister_intr(gsi);
555 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
557 static int __init acpi_parse_fadt(struct acpi_table_header *table)
559 struct acpi_table_header *fadt_header;
560 struct acpi_table_fadt *fadt;
562 fadt_header = (struct acpi_table_header *)table;
563 if (fadt_header->revision != 3)
564 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
566 fadt = (struct acpi_table_fadt *)fadt_header;
568 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
573 int __init early_acpi_boot_init(void)
578 * do a partial walk of MADT to determine how many CPUs
579 * we have including offline CPUs
581 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
582 printk(KERN_ERR PREFIX "Can't find MADT\n");
586 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
587 acpi_parse_lsapic, NR_CPUS);
589 printk(KERN_ERR PREFIX
590 "Error parsing MADT - no LAPIC entries\n");
595 if (available_cpus == 0) {
596 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
597 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
598 smp_boot_data.cpu_phys_id[available_cpus] =
599 hard_smp_processor_id();
600 available_cpus = 1; /* We've got at least one of these, no? */
602 smp_boot_data.cpu_count = available_cpus;
604 /* Make boot-up look pretty */
605 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
611 int __init acpi_boot_init(void)
617 * Parse the Multiple APIC Description Table (MADT), if exists.
618 * Note that this table provides platform SMP configuration
619 * information -- the successor to MPS tables.
622 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
623 printk(KERN_ERR PREFIX "Can't find MADT\n");
629 if (acpi_table_parse_madt
630 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
631 printk(KERN_ERR PREFIX
632 "Error parsing LAPIC address override entry\n");
634 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
636 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
640 if (acpi_table_parse_madt
641 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
642 printk(KERN_ERR PREFIX
643 "Error parsing MADT - no IOSAPIC entries\n");
646 /* System-Level Interrupt Routing */
648 if (acpi_table_parse_madt
649 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
650 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
651 printk(KERN_ERR PREFIX
652 "Error parsing platform interrupt source entry\n");
654 if (acpi_table_parse_madt
655 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
656 printk(KERN_ERR PREFIX
657 "Error parsing interrupt source overrides entry\n");
659 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
660 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
664 * FADT says whether a legacy keyboard controller is present.
665 * The FADT also contains an SCI_INT line, by which the system
666 * gets interrupts such as power and sleep buttons. If it's not
667 * on a Legacy interrupt, it needs to be setup.
669 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
670 printk(KERN_ERR PREFIX "Can't find FADT\n");
672 #ifdef CONFIG_ACPI_NUMA
674 if (srat_num_cpus == 0) {
676 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
677 if (smp_boot_data.cpu_phys_id[cpu] !=
678 hard_smp_processor_id())
679 node_cpuid[i++].phys_id =
680 smp_boot_data.cpu_phys_id[cpu];
683 build_cpu_to_node_map();
688 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
692 if (has_8259 && gsi < 16)
693 *irq = isa_irq_to_vector(gsi);
695 tmp = gsi_to_irq(gsi);
703 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
712 * ACPI based hotplug CPU support
714 #ifdef CONFIG_ACPI_HOTPLUG_CPU
715 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
717 #ifdef CONFIG_ACPI_NUMA
719 * We don't have cpu-only-node hotadd. But if the system equips
720 * SRAT table, pxm is already found and node is ready.
721 * So, just pxm_to_nid(pxm) is OK.
722 * This code here is for the system which doesn't have full SRAT
723 * table for possible cpus.
725 node_cpuid[cpu].phys_id = physid;
726 node_cpuid[cpu].nid = acpi_get_node(handle);
731 int additional_cpus __initdata = -1;
733 static __init int setup_additional_cpus(char *s)
736 additional_cpus = simple_strtol(s, NULL, 0);
741 early_param("additional_cpus", setup_additional_cpus);
744 * cpu_possible_mask should be static, it cannot change as CPUs
745 * are onlined, or offlined. The reason is per-cpu data-structures
746 * are allocated by some modules at init time, and dont expect to
747 * do this dynamically on cpu arrival/departure.
748 * cpu_present_mask on the other hand can change dynamically.
749 * In case when cpu_hotplug is not compiled, then we resort to current
750 * behaviour, which is cpu_possible == cpu_present.
753 * Three ways to find out the number of additional hotplug CPUs:
754 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
755 * - The user can overwrite it with additional_cpus=NUM
756 * - Otherwise don't reserve additional CPUs.
758 __init void prefill_possible_map(void)
761 int possible, disabled_cpus;
763 disabled_cpus = total_cpus - available_cpus;
765 if (additional_cpus == -1) {
766 if (disabled_cpus > 0)
767 additional_cpus = disabled_cpus;
772 possible = available_cpus + additional_cpus;
774 if (possible > nr_cpu_ids)
775 possible = nr_cpu_ids;
777 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
778 possible, max((possible - available_cpus), 0));
780 for (i = 0; i < possible; i++)
781 set_cpu_possible(i, true);
784 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
788 cpu = cpumask_first_zero(cpu_present_mask);
789 if (cpu >= nr_cpu_ids)
792 acpi_map_cpu2node(handle, cpu, physid);
794 set_cpu_present(cpu, true);
795 ia64_cpu_to_sapicid[cpu] = physid;
797 acpi_processor_set_pdc(handle);
803 /* wrapper to silence section mismatch warning */
804 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
807 return _acpi_map_lsapic(handle, physid, pcpu);
809 EXPORT_SYMBOL(acpi_map_cpu);
811 int acpi_unmap_cpu(int cpu)
813 ia64_cpu_to_sapicid[cpu] = -1;
814 set_cpu_present(cpu, false);
816 #ifdef CONFIG_ACPI_NUMA
817 /* NUMA specific cleanup's */
822 EXPORT_SYMBOL(acpi_unmap_cpu);
823 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
825 #ifdef CONFIG_ACPI_NUMA
826 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
827 void *context, void **ret)
829 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
830 union acpi_object *obj;
831 struct acpi_madt_io_sapic *iosapic;
832 unsigned int gsi_base;
835 /* Only care about objects w/ a method that returns the MADT */
836 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
839 if (!buffer.length || !buffer.pointer)
842 obj = buffer.pointer;
843 if (obj->type != ACPI_TYPE_BUFFER ||
844 obj->buffer.length < sizeof(*iosapic)) {
845 kfree(buffer.pointer);
849 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
851 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
852 kfree(buffer.pointer);
856 gsi_base = iosapic->global_irq_base;
858 kfree(buffer.pointer);
860 /* OK, it's an IOSAPIC MADT entry; associate it with a node */
861 node = acpi_get_node(handle);
862 if (node == NUMA_NO_NODE || !node_online(node) ||
863 cpumask_empty(cpumask_of_node(node)))
866 /* We know a gsi to node mapping! */
867 map_iosapic_to_node(gsi_base, node);
872 acpi_map_iosapics (void)
874 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
878 fs_initcall(acpi_map_iosapics);
879 #endif /* CONFIG_ACPI_NUMA */
881 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
885 if ((err = iosapic_init(phys_addr, gsi_base)))
888 #ifdef CONFIG_ACPI_NUMA
889 acpi_map_iosapic(handle, 0, NULL, NULL);
890 #endif /* CONFIG_ACPI_NUMA */
895 EXPORT_SYMBOL(acpi_register_ioapic);
897 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
899 return iosapic_remove(gsi_base);
902 EXPORT_SYMBOL(acpi_unregister_ioapic);
905 * acpi_suspend_lowlevel() - save kernel state and suspend.
907 * TBD when IA64 starts to support suspend...
909 int acpi_suspend_lowlevel(void) { return 0; }
911 void acpi_proc_quirk_mwait_check(void)