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 unsigned long acpi_wakeup_address = 0;
47 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
49 /* Array to record platform interrupt vectors for generic interrupt routing. */
50 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
51 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
54 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
57 * Interrupt routing API for device drivers. Provides interrupt vector for
58 * a generic platform event. Currently only CPEI is implemented.
60 int acpi_request_vector(u32 int_type)
64 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
65 /* corrected platform error interrupt */
66 vector = platform_intr_list[int_type];
69 "acpi_request_vector(): invalid interrupt type\n");
73 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
78 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
82 /* --------------------------------------------------------------------------
83 Boot-time Table Parsing
84 -------------------------------------------------------------------------- */
86 static int available_cpus __initdata;
87 struct acpi_table_madt *acpi_madt __initdata;
91 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
92 const unsigned long end)
94 struct acpi_madt_local_apic_override *lapic;
96 lapic = (struct acpi_madt_local_apic_override *)header;
98 if (BAD_MADT_ENTRY(lapic, end))
101 if (lapic->address) {
102 iounmap(ipi_base_addr);
103 ipi_base_addr = ioremap(lapic->address, 0);
109 acpi_parse_lsapic(union acpi_subtable_headers *header, const unsigned long end)
111 struct acpi_madt_local_sapic *lsapic;
113 lsapic = (struct acpi_madt_local_sapic *)header;
115 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
117 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
119 smp_boot_data.cpu_phys_id[available_cpus] =
120 (lsapic->id << 8) | lsapic->eid;
130 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
132 struct acpi_madt_local_apic_nmi *lacpi_nmi;
134 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
136 if (BAD_MADT_ENTRY(lacpi_nmi, end))
139 /* TBD: Support lapic_nmi entries */
144 acpi_parse_iosapic(union acpi_subtable_headers * header, const unsigned long end)
146 struct acpi_madt_io_sapic *iosapic;
148 iosapic = (struct acpi_madt_io_sapic *)header;
150 if (BAD_MADT_ENTRY(iosapic, end))
153 return iosapic_init(iosapic->address, iosapic->global_irq_base);
156 static unsigned int __initdata acpi_madt_rev;
159 acpi_parse_plat_int_src(union acpi_subtable_headers * header,
160 const unsigned long end)
162 struct acpi_madt_interrupt_source *plintsrc;
165 plintsrc = (struct acpi_madt_interrupt_source *)header;
167 if (BAD_MADT_ENTRY(plintsrc, end))
171 * Get vector assignment for this interrupt, set attributes,
172 * and program the IOSAPIC routing table.
174 vector = iosapic_register_platform_intr(plintsrc->type,
175 plintsrc->global_irq,
176 plintsrc->io_sapic_vector,
179 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
180 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
181 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
182 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
183 ACPI_MADT_TRIGGER_EDGE) ?
184 IOSAPIC_EDGE : IOSAPIC_LEVEL);
186 platform_intr_list[plintsrc->type] = vector;
187 if (acpi_madt_rev > 1) {
188 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
192 * Save the physical id, so we can check when its being removed
194 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
199 #ifdef CONFIG_HOTPLUG_CPU
200 unsigned int can_cpei_retarget(void)
202 extern int cpe_vector;
203 extern unsigned int force_cpei_retarget;
206 * Only if CPEI is supported and the override flag
207 * is present, otherwise return that its re-targettable
208 * if we are in polling mode.
210 if (cpe_vector > 0) {
211 if (acpi_cpei_override || force_cpei_retarget)
219 unsigned int is_cpu_cpei_target(unsigned int cpu)
221 unsigned int logical_id;
223 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
225 if (logical_id == cpu)
231 void set_cpei_target_cpu(unsigned int cpu)
233 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
237 unsigned int get_cpei_target_cpu(void)
239 return acpi_cpei_phys_cpuid;
243 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
244 const unsigned long end)
246 struct acpi_madt_interrupt_override *p;
248 p = (struct acpi_madt_interrupt_override *)header;
250 if (BAD_MADT_ENTRY(p, end))
253 iosapic_override_isa_irq(p->source_irq, p->global_irq,
254 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
255 ACPI_MADT_POLARITY_ACTIVE_LOW) ?
256 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
257 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
258 ACPI_MADT_TRIGGER_LEVEL) ?
259 IOSAPIC_LEVEL : IOSAPIC_EDGE);
264 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
266 struct acpi_madt_nmi_source *nmi_src;
268 nmi_src = (struct acpi_madt_nmi_source *)header;
270 if (BAD_MADT_ENTRY(nmi_src, end))
273 /* TBD: Support nimsrc entries */
277 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
279 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
282 * Unfortunately ITC_DRIFT is not yet part of the
283 * official SAL spec, so the ITC_DRIFT bit is not
284 * set by the BIOS on this hardware.
286 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
292 static int __init acpi_parse_madt(struct acpi_table_header *table)
294 acpi_madt = (struct acpi_table_madt *)table;
296 acpi_madt_rev = acpi_madt->header.revision;
298 /* remember the value for reference after free_initmem() */
299 #ifdef CONFIG_ITANIUM
300 has_8259 = 1; /* Firmware on old Itanium systems is broken */
302 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
304 iosapic_system_init(has_8259);
306 /* Get base address of IPI Message Block */
308 if (acpi_madt->address)
309 ipi_base_addr = ioremap(acpi_madt->address, 0);
311 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
313 acpi_madt_oem_check(acpi_madt->header.oem_id,
314 acpi_madt->header.oem_table_id);
319 #ifdef CONFIG_ACPI_NUMA
323 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
325 static int __initdata srat_num_cpus; /* number of cpus */
326 static u32 pxm_flag[PXM_FLAG_LEN];
327 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
328 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
329 static struct acpi_table_slit __initdata *slit_table;
330 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
333 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
337 pxm = pa->proximity_domain_lo;
338 if (acpi_srat_revision >= 2)
339 pxm += pa->proximity_domain_hi[0] << 8;
344 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
348 pxm = ma->proximity_domain;
349 if (acpi_srat_revision <= 1)
356 * ACPI 2.0 SLIT (System Locality Information Table)
357 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
359 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
363 len = sizeof(struct acpi_table_header) + 8
364 + slit->locality_count * slit->locality_count;
365 if (slit->header.length != len) {
367 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
368 len, slit->header.length);
375 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
379 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
382 if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
383 printk_once(KERN_WARNING
384 "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
385 ARRAY_SIZE(node_cpuid));
388 pxm = get_processor_proximity_domain(pa);
390 /* record this node in proximity bitmap */
393 node_cpuid[srat_num_cpus].phys_id =
394 (pa->apic_id << 8) | (pa->local_sapic_eid);
395 /* nid should be overridden as logical node id later */
396 node_cpuid[srat_num_cpus].nid = pxm;
397 cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
402 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
404 unsigned long paddr, size;
406 struct node_memblk_s *p, *q, *pend;
408 pxm = get_memory_proximity_domain(ma);
410 /* fill node memory chunk structure */
411 paddr = ma->base_address;
414 /* Ignore disabled entries */
415 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
418 if (num_node_memblks >= NR_NODE_MEMBLKS) {
419 pr_err("NUMA: too many memblk ranges\n");
423 /* record this node in proximity bitmap */
426 /* Insertion sort based on base address */
427 pend = &node_memblk[num_node_memblks];
428 for (p = &node_memblk[0]; p < pend; p++) {
429 if (paddr < p->start_paddr)
433 for (q = pend - 1; q >= p; q--)
436 p->start_paddr = paddr;
443 void __init acpi_numa_fixup(void)
445 int i, j, node_from, node_to;
447 /* If there's no SRAT, fix the phys_id and mark node 0 online */
448 if (srat_num_cpus == 0) {
450 node_cpuid[0].phys_id = hard_smp_processor_id();
451 slit_distance(0, 0) = LOCAL_DISTANCE;
456 * MCD - This can probably be dropped now. No need for pxm ID to node ID
457 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
459 nodes_clear(node_online_map);
460 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
461 if (pxm_bit_test(i)) {
462 int nid = acpi_map_pxm_to_node(i);
463 node_set_online(nid);
467 /* set logical node id in memory chunk structure */
468 for (i = 0; i < num_node_memblks; i++)
469 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
471 /* assign memory bank numbers for each chunk on each node */
472 for_each_online_node(i) {
476 for (j = 0; j < num_node_memblks; j++)
477 if (node_memblk[j].nid == i)
478 node_memblk[j].bank = bank++;
481 /* set logical node id in cpu structure */
482 for_each_possible_early_cpu(i)
483 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
485 printk(KERN_INFO "Number of logical nodes in system = %d\n",
487 printk(KERN_INFO "Number of memory chunks in system = %d\n",
491 for (i = 0; i < MAX_NUMNODES; i++)
492 for (j = 0; j < MAX_NUMNODES; j++)
493 slit_distance(i, j) = i == j ?
494 LOCAL_DISTANCE : REMOTE_DISTANCE;
498 memset(numa_slit, -1, sizeof(numa_slit));
499 for (i = 0; i < slit_table->locality_count; i++) {
500 if (!pxm_bit_test(i))
502 node_from = pxm_to_node(i);
503 for (j = 0; j < slit_table->locality_count; j++) {
504 if (!pxm_bit_test(j))
506 node_to = pxm_to_node(j);
507 slit_distance(node_from, node_to) =
508 slit_table->entry[i * slit_table->locality_count + j];
513 printk("ACPI 2.0 SLIT locality table:\n");
514 for_each_online_node(i) {
515 for_each_online_node(j)
516 printk("%03d ", node_distance(i, j));
521 node_possible_map = node_online_map;
523 #endif /* CONFIG_ACPI_NUMA */
526 * success: return IRQ number (>=0)
527 * failure: return < 0
529 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
531 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
534 if (has_8259 && gsi < 16)
535 return isa_irq_to_vector(gsi);
537 return iosapic_register_intr(gsi,
539 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
542 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
545 EXPORT_SYMBOL_GPL(acpi_register_gsi);
547 void acpi_unregister_gsi(u32 gsi)
549 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
552 if (has_8259 && gsi < 16)
555 iosapic_unregister_intr(gsi);
557 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
559 static int __init acpi_parse_fadt(struct acpi_table_header *table)
561 struct acpi_table_header *fadt_header;
562 struct acpi_table_fadt *fadt;
564 fadt_header = (struct acpi_table_header *)table;
565 if (fadt_header->revision != 3)
566 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
568 fadt = (struct acpi_table_fadt *)fadt_header;
570 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
575 int __init early_acpi_boot_init(void)
580 * do a partial walk of MADT to determine how many CPUs
581 * we have including offline CPUs
583 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
584 printk(KERN_ERR PREFIX "Can't find MADT\n");
588 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
589 acpi_parse_lsapic, NR_CPUS);
591 printk(KERN_ERR PREFIX
592 "Error parsing MADT - no LAPIC entries\n");
597 if (available_cpus == 0) {
598 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
599 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
600 smp_boot_data.cpu_phys_id[available_cpus] =
601 hard_smp_processor_id();
602 available_cpus = 1; /* We've got at least one of these, no? */
604 smp_boot_data.cpu_count = available_cpus;
606 /* Make boot-up look pretty */
607 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
613 int __init acpi_boot_init(void)
619 * Parse the Multiple APIC Description Table (MADT), if exists.
620 * Note that this table provides platform SMP configuration
621 * information -- the successor to MPS tables.
624 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
625 printk(KERN_ERR PREFIX "Can't find MADT\n");
631 if (acpi_table_parse_madt
632 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
633 printk(KERN_ERR PREFIX
634 "Error parsing LAPIC address override entry\n");
636 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
638 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
642 if (acpi_table_parse_madt
643 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
644 printk(KERN_ERR PREFIX
645 "Error parsing MADT - no IOSAPIC entries\n");
648 /* System-Level Interrupt Routing */
650 if (acpi_table_parse_madt
651 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
652 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
653 printk(KERN_ERR PREFIX
654 "Error parsing platform interrupt source entry\n");
656 if (acpi_table_parse_madt
657 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
658 printk(KERN_ERR PREFIX
659 "Error parsing interrupt source overrides entry\n");
661 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
662 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
666 * FADT says whether a legacy keyboard controller is present.
667 * The FADT also contains an SCI_INT line, by which the system
668 * gets interrupts such as power and sleep buttons. If it's not
669 * on a Legacy interrupt, it needs to be setup.
671 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
672 printk(KERN_ERR PREFIX "Can't find FADT\n");
674 #ifdef CONFIG_ACPI_NUMA
676 if (srat_num_cpus == 0) {
678 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
679 if (smp_boot_data.cpu_phys_id[cpu] !=
680 hard_smp_processor_id())
681 node_cpuid[i++].phys_id =
682 smp_boot_data.cpu_phys_id[cpu];
685 build_cpu_to_node_map();
690 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
694 if (has_8259 && gsi < 16)
695 *irq = isa_irq_to_vector(gsi);
697 tmp = gsi_to_irq(gsi);
705 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
714 * ACPI based hotplug CPU support
716 #ifdef CONFIG_ACPI_HOTPLUG_CPU
717 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
719 #ifdef CONFIG_ACPI_NUMA
721 * We don't have cpu-only-node hotadd. But if the system equips
722 * SRAT table, pxm is already found and node is ready.
723 * So, just pxm_to_nid(pxm) is OK.
724 * This code here is for the system which doesn't have full SRAT
725 * table for possible cpus.
727 node_cpuid[cpu].phys_id = physid;
728 node_cpuid[cpu].nid = acpi_get_node(handle);
733 int additional_cpus __initdata = -1;
735 static __init int setup_additional_cpus(char *s)
738 additional_cpus = simple_strtol(s, NULL, 0);
743 early_param("additional_cpus", setup_additional_cpus);
746 * cpu_possible_mask should be static, it cannot change as CPUs
747 * are onlined, or offlined. The reason is per-cpu data-structures
748 * are allocated by some modules at init time, and dont expect to
749 * do this dynamically on cpu arrival/departure.
750 * cpu_present_mask on the other hand can change dynamically.
751 * In case when cpu_hotplug is not compiled, then we resort to current
752 * behaviour, which is cpu_possible == cpu_present.
755 * Three ways to find out the number of additional hotplug CPUs:
756 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
757 * - The user can overwrite it with additional_cpus=NUM
758 * - Otherwise don't reserve additional CPUs.
760 __init void prefill_possible_map(void)
763 int possible, disabled_cpus;
765 disabled_cpus = total_cpus - available_cpus;
767 if (additional_cpus == -1) {
768 if (disabled_cpus > 0)
769 additional_cpus = disabled_cpus;
774 possible = available_cpus + additional_cpus;
776 if (possible > nr_cpu_ids)
777 possible = nr_cpu_ids;
779 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
780 possible, max((possible - available_cpus), 0));
782 for (i = 0; i < possible; i++)
783 set_cpu_possible(i, true);
786 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
791 cpumask_complement(&tmp_map, cpu_present_mask);
792 cpu = cpumask_first(&tmp_map);
793 if (cpu >= nr_cpu_ids)
796 acpi_map_cpu2node(handle, cpu, physid);
798 set_cpu_present(cpu, true);
799 ia64_cpu_to_sapicid[cpu] = physid;
801 acpi_processor_set_pdc(handle);
807 /* wrapper to silence section mismatch warning */
808 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
811 return _acpi_map_lsapic(handle, physid, pcpu);
813 EXPORT_SYMBOL(acpi_map_cpu);
815 int acpi_unmap_cpu(int cpu)
817 ia64_cpu_to_sapicid[cpu] = -1;
818 set_cpu_present(cpu, false);
820 #ifdef CONFIG_ACPI_NUMA
821 /* NUMA specific cleanup's */
826 EXPORT_SYMBOL(acpi_unmap_cpu);
827 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
829 #ifdef CONFIG_ACPI_NUMA
830 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
831 void *context, void **ret)
833 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
834 union acpi_object *obj;
835 struct acpi_madt_io_sapic *iosapic;
836 unsigned int gsi_base;
839 /* Only care about objects w/ a method that returns the MADT */
840 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
843 if (!buffer.length || !buffer.pointer)
846 obj = buffer.pointer;
847 if (obj->type != ACPI_TYPE_BUFFER ||
848 obj->buffer.length < sizeof(*iosapic)) {
849 kfree(buffer.pointer);
853 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
855 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
856 kfree(buffer.pointer);
860 gsi_base = iosapic->global_irq_base;
862 kfree(buffer.pointer);
864 /* OK, it's an IOSAPIC MADT entry; associate it with a node */
865 node = acpi_get_node(handle);
866 if (node == NUMA_NO_NODE || !node_online(node) ||
867 cpumask_empty(cpumask_of_node(node)))
870 /* We know a gsi to node mapping! */
871 map_iosapic_to_node(gsi_base, node);
876 acpi_map_iosapics (void)
878 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
882 fs_initcall(acpi_map_iosapics);
883 #endif /* CONFIG_ACPI_NUMA */
885 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
889 if ((err = iosapic_init(phys_addr, gsi_base)))
892 #ifdef CONFIG_ACPI_NUMA
893 acpi_map_iosapic(handle, 0, NULL, NULL);
894 #endif /* CONFIG_ACPI_NUMA */
899 EXPORT_SYMBOL(acpi_register_ioapic);
901 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
903 return iosapic_remove(gsi_base);
906 EXPORT_SYMBOL(acpi_unregister_ioapic);
909 * acpi_suspend_lowlevel() - save kernel state and suspend.
911 * TBD when when IA64 starts to support suspend...
913 int acpi_suspend_lowlevel(void) { return 0; }