2 * acpi.c - Architecture-Specific Low-Level ACPI Support
4 * Copyright (C) 1999 VA Linux Systems
5 * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
6 * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
7 * David Mosberger-Tang <davidm@hpl.hp.com>
8 * Copyright (C) 2000 Intel Corp.
9 * Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
10 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
11 * Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
12 * Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
13 * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
14 * Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
16 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/sched.h>
39 #include <linux/smp.h>
40 #include <linux/string.h>
41 #include <linux/types.h>
42 #include <linux/irq.h>
43 #include <linux/acpi.h>
44 #include <linux/efi.h>
45 #include <linux/mmzone.h>
46 #include <linux/nodemask.h>
47 #include <linux/slab.h>
48 #include <acpi/processor.h>
50 #include <asm/iosapic.h>
51 #include <asm/machvec.h>
53 #include <asm/system.h>
56 #include <asm/cyclone.h>
57 #include <asm/xen/hypervisor.h>
59 #define BAD_MADT_ENTRY(entry, end) ( \
60 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
61 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
63 #define PREFIX "ACPI: "
66 unsigned int acpi_cpei_override;
67 unsigned int acpi_cpei_phys_cpuid;
69 unsigned long acpi_wakeup_address = 0;
71 #ifdef CONFIG_IA64_GENERIC
72 static unsigned long __init acpi_find_rsdp(void)
74 unsigned long rsdp_phys = 0;
76 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
77 rsdp_phys = efi.acpi20;
78 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
79 printk(KERN_WARNING PREFIX
80 "v1.0/r0.71 tables no longer supported\n");
85 acpi_get_sysname(void)
87 unsigned long rsdp_phys;
88 struct acpi_table_rsdp *rsdp;
89 struct acpi_table_xsdt *xsdt;
90 struct acpi_table_header *hdr;
95 rsdp_phys = acpi_find_rsdp();
98 "ACPI 2.0 RSDP not found, default to \"dig\"\n");
102 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
103 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
105 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
109 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
111 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
113 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
117 if (!strcmp(hdr->oem_id, "HP")) {
119 } else if (!strcmp(hdr->oem_id, "SGI")) {
120 if (!strcmp(hdr->oem_table_id + 4, "UV"))
124 } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
129 /* Look for Intel IOMMU */
130 nentries = (hdr->length - sizeof(*hdr)) /
131 sizeof(xsdt->table_offset_entry[0]);
132 for (i = 0; i < nentries; i++) {
133 hdr = __va(xsdt->table_offset_entry[i]);
134 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
135 sizeof(ACPI_SIG_DMAR) - 1) == 0)
142 #endif /* CONFIG_IA64_GENERIC */
144 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
146 /* Array to record platform interrupt vectors for generic interrupt routing. */
147 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
148 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
151 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
154 * Interrupt routing API for device drivers. Provides interrupt vector for
155 * a generic platform event. Currently only CPEI is implemented.
157 int acpi_request_vector(u32 int_type)
161 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
162 /* corrected platform error interrupt */
163 vector = platform_intr_list[int_type];
166 "acpi_request_vector(): invalid interrupt type\n");
170 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
172 return __va(phys_addr);
175 void __init __acpi_unmap_table(char *map, unsigned long size)
179 /* --------------------------------------------------------------------------
180 Boot-time Table Parsing
181 -------------------------------------------------------------------------- */
183 static int available_cpus __initdata;
184 struct acpi_table_madt *acpi_madt __initdata;
188 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
189 const unsigned long end)
191 struct acpi_madt_local_apic_override *lapic;
193 lapic = (struct acpi_madt_local_apic_override *)header;
195 if (BAD_MADT_ENTRY(lapic, end))
198 if (lapic->address) {
199 iounmap(ipi_base_addr);
200 ipi_base_addr = ioremap(lapic->address, 0);
206 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
208 struct acpi_madt_local_sapic *lsapic;
210 lsapic = (struct acpi_madt_local_sapic *)header;
212 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
214 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
216 smp_boot_data.cpu_phys_id[available_cpus] =
217 (lsapic->id << 8) | lsapic->eid;
227 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
229 struct acpi_madt_local_apic_nmi *lacpi_nmi;
231 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
233 if (BAD_MADT_ENTRY(lacpi_nmi, end))
236 /* TBD: Support lapic_nmi entries */
241 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
243 struct acpi_madt_io_sapic *iosapic;
245 iosapic = (struct acpi_madt_io_sapic *)header;
247 if (BAD_MADT_ENTRY(iosapic, end))
250 return iosapic_init(iosapic->address, iosapic->global_irq_base);
253 static unsigned int __initdata acpi_madt_rev;
256 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
257 const unsigned long end)
259 struct acpi_madt_interrupt_source *plintsrc;
262 plintsrc = (struct acpi_madt_interrupt_source *)header;
264 if (BAD_MADT_ENTRY(plintsrc, end))
268 * Get vector assignment for this interrupt, set attributes,
269 * and program the IOSAPIC routing table.
271 vector = iosapic_register_platform_intr(plintsrc->type,
272 plintsrc->global_irq,
273 plintsrc->io_sapic_vector,
276 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
277 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
278 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
279 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
280 ACPI_MADT_TRIGGER_EDGE) ?
281 IOSAPIC_EDGE : IOSAPIC_LEVEL);
283 platform_intr_list[plintsrc->type] = vector;
284 if (acpi_madt_rev > 1) {
285 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
289 * Save the physical id, so we can check when its being removed
291 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
296 #ifdef CONFIG_HOTPLUG_CPU
297 unsigned int can_cpei_retarget(void)
299 extern int cpe_vector;
300 extern unsigned int force_cpei_retarget;
303 * Only if CPEI is supported and the override flag
304 * is present, otherwise return that its re-targettable
305 * if we are in polling mode.
307 if (cpe_vector > 0) {
308 if (acpi_cpei_override || force_cpei_retarget)
316 unsigned int is_cpu_cpei_target(unsigned int cpu)
318 unsigned int logical_id;
320 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
322 if (logical_id == cpu)
328 void set_cpei_target_cpu(unsigned int cpu)
330 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
334 unsigned int get_cpei_target_cpu(void)
336 return acpi_cpei_phys_cpuid;
340 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
341 const unsigned long end)
343 struct acpi_madt_interrupt_override *p;
345 p = (struct acpi_madt_interrupt_override *)header;
347 if (BAD_MADT_ENTRY(p, end))
350 iosapic_override_isa_irq(p->source_irq, p->global_irq,
351 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
352 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
353 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
354 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
355 ACPI_MADT_TRIGGER_EDGE) ?
356 IOSAPIC_EDGE : IOSAPIC_LEVEL);
361 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
363 struct acpi_madt_nmi_source *nmi_src;
365 nmi_src = (struct acpi_madt_nmi_source *)header;
367 if (BAD_MADT_ENTRY(nmi_src, end))
370 /* TBD: Support nimsrc entries */
374 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
376 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
379 * Unfortunately ITC_DRIFT is not yet part of the
380 * official SAL spec, so the ITC_DRIFT bit is not
381 * set by the BIOS on this hardware.
383 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
389 static int __init acpi_parse_madt(struct acpi_table_header *table)
394 acpi_madt = (struct acpi_table_madt *)table;
396 acpi_madt_rev = acpi_madt->header.revision;
398 /* remember the value for reference after free_initmem() */
399 #ifdef CONFIG_ITANIUM
400 has_8259 = 1; /* Firmware on old Itanium systems is broken */
402 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
404 iosapic_system_init(has_8259);
406 /* Get base address of IPI Message Block */
408 if (acpi_madt->address)
409 ipi_base_addr = ioremap(acpi_madt->address, 0);
411 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
413 acpi_madt_oem_check(acpi_madt->header.oem_id,
414 acpi_madt->header.oem_table_id);
419 #ifdef CONFIG_ACPI_NUMA
423 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
425 static int __initdata srat_num_cpus; /* number of cpus */
426 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
427 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
428 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
429 static struct acpi_table_slit __initdata *slit_table;
430 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
432 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
436 pxm = pa->proximity_domain_lo;
437 if (ia64_platform_is("sn2"))
438 pxm += pa->proximity_domain_hi[0] << 8;
442 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
446 pxm = ma->proximity_domain;
447 if (!ia64_platform_is("sn2"))
454 * ACPI 2.0 SLIT (System Locality Information Table)
455 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
457 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
461 len = sizeof(struct acpi_table_header) + 8
462 + slit->locality_count * slit->locality_count;
463 if (slit->header.length != len) {
465 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
466 len, slit->header.length);
473 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
477 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
480 if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
481 printk_once(KERN_WARNING
482 "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
483 ARRAY_SIZE(node_cpuid));
486 pxm = get_processor_proximity_domain(pa);
488 /* record this node in proximity bitmap */
491 node_cpuid[srat_num_cpus].phys_id =
492 (pa->apic_id << 8) | (pa->local_sapic_eid);
493 /* nid should be overridden as logical node id later */
494 node_cpuid[srat_num_cpus].nid = pxm;
495 cpu_set(srat_num_cpus, early_cpu_possible_map);
500 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
502 unsigned long paddr, size;
504 struct node_memblk_s *p, *q, *pend;
506 pxm = get_memory_proximity_domain(ma);
508 /* fill node memory chunk structure */
509 paddr = ma->base_address;
512 /* Ignore disabled entries */
513 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
516 /* record this node in proximity bitmap */
519 /* Insertion sort based on base address */
520 pend = &node_memblk[num_node_memblks];
521 for (p = &node_memblk[0]; p < pend; p++) {
522 if (paddr < p->start_paddr)
526 for (q = pend - 1; q >= p; q--)
529 p->start_paddr = paddr;
535 void __init acpi_numa_arch_fixup(void)
537 int i, j, node_from, node_to;
539 /* If there's no SRAT, fix the phys_id and mark node 0 online */
540 if (srat_num_cpus == 0) {
542 node_cpuid[0].phys_id = hard_smp_processor_id();
547 * MCD - This can probably be dropped now. No need for pxm ID to node ID
548 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
550 nodes_clear(node_online_map);
551 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
552 if (pxm_bit_test(i)) {
553 int nid = acpi_map_pxm_to_node(i);
554 node_set_online(nid);
558 /* set logical node id in memory chunk structure */
559 for (i = 0; i < num_node_memblks; i++)
560 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
562 /* assign memory bank numbers for each chunk on each node */
563 for_each_online_node(i) {
567 for (j = 0; j < num_node_memblks; j++)
568 if (node_memblk[j].nid == i)
569 node_memblk[j].bank = bank++;
572 /* set logical node id in cpu structure */
573 for_each_possible_early_cpu(i)
574 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
576 printk(KERN_INFO "Number of logical nodes in system = %d\n",
578 printk(KERN_INFO "Number of memory chunks in system = %d\n",
582 for (i = 0; i < MAX_NUMNODES; i++)
583 for (j = 0; j < MAX_NUMNODES; j++)
584 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
589 memset(numa_slit, -1, sizeof(numa_slit));
590 for (i = 0; i < slit_table->locality_count; i++) {
591 if (!pxm_bit_test(i))
593 node_from = pxm_to_node(i);
594 for (j = 0; j < slit_table->locality_count; j++) {
595 if (!pxm_bit_test(j))
597 node_to = pxm_to_node(j);
598 node_distance(node_from, node_to) =
599 slit_table->entry[i * slit_table->locality_count + j];
604 printk("ACPI 2.0 SLIT locality table:\n");
605 for_each_online_node(i) {
606 for_each_online_node(j)
607 printk("%03d ", node_distance(i, j));
612 #endif /* CONFIG_ACPI_NUMA */
615 * success: return IRQ number (>=0)
616 * failure: return < 0
618 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
620 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
623 if (has_8259 && gsi < 16)
624 return isa_irq_to_vector(gsi);
626 return iosapic_register_intr(gsi,
628 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
631 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
635 void acpi_unregister_gsi(u32 gsi)
637 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
640 if (has_8259 && gsi < 16)
643 iosapic_unregister_intr(gsi);
646 static int __init acpi_parse_fadt(struct acpi_table_header *table)
648 struct acpi_table_header *fadt_header;
649 struct acpi_table_fadt *fadt;
654 fadt_header = (struct acpi_table_header *)table;
655 if (fadt_header->revision != 3)
656 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
658 fadt = (struct acpi_table_fadt *)fadt_header;
660 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
665 int __init early_acpi_boot_init(void)
670 * do a partial walk of MADT to determine how many CPUs
671 * we have including offline CPUs
673 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
674 printk(KERN_ERR PREFIX "Can't find MADT\n");
678 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
679 acpi_parse_lsapic, NR_CPUS);
681 printk(KERN_ERR PREFIX
682 "Error parsing MADT - no LAPIC entries\n");
685 if (available_cpus == 0) {
686 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
687 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
688 smp_boot_data.cpu_phys_id[available_cpus] =
689 hard_smp_processor_id();
690 available_cpus = 1; /* We've got at least one of these, no? */
692 smp_boot_data.cpu_count = available_cpus;
694 /* Make boot-up look pretty */
695 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
701 int __init acpi_boot_init(void)
707 * Parse the Multiple APIC Description Table (MADT), if exists.
708 * Note that this table provides platform SMP configuration
709 * information -- the successor to MPS tables.
712 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
713 printk(KERN_ERR PREFIX "Can't find MADT\n");
719 if (acpi_table_parse_madt
720 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
721 printk(KERN_ERR PREFIX
722 "Error parsing LAPIC address override entry\n");
724 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
726 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
730 if (acpi_table_parse_madt
731 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
732 if (!ia64_platform_is("sn2"))
733 printk(KERN_ERR PREFIX
734 "Error parsing MADT - no IOSAPIC entries\n");
737 /* System-Level Interrupt Routing */
739 if (acpi_table_parse_madt
740 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
741 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
742 printk(KERN_ERR PREFIX
743 "Error parsing platform interrupt source entry\n");
745 if (acpi_table_parse_madt
746 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
747 printk(KERN_ERR PREFIX
748 "Error parsing interrupt source overrides entry\n");
750 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
751 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
755 * FADT says whether a legacy keyboard controller is present.
756 * The FADT also contains an SCI_INT line, by which the system
757 * gets interrupts such as power and sleep buttons. If it's not
758 * on a Legacy interrupt, it needs to be setup.
760 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
761 printk(KERN_ERR PREFIX "Can't find FADT\n");
763 #ifdef CONFIG_ACPI_NUMA
765 if (srat_num_cpus == 0) {
767 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
768 if (smp_boot_data.cpu_phys_id[cpu] !=
769 hard_smp_processor_id())
770 node_cpuid[i++].phys_id =
771 smp_boot_data.cpu_phys_id[cpu];
774 build_cpu_to_node_map();
779 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
783 if (has_8259 && gsi < 16)
784 *irq = isa_irq_to_vector(gsi);
786 tmp = gsi_to_irq(gsi);
794 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
803 * ACPI based hotplug CPU support
805 #ifdef CONFIG_ACPI_HOTPLUG_CPU
807 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
809 #ifdef CONFIG_ACPI_NUMA
813 pxm_id = acpi_get_pxm(handle);
815 * We don't have cpu-only-node hotadd. But if the system equips
816 * SRAT table, pxm is already found and node is ready.
817 * So, just pxm_to_nid(pxm) is OK.
818 * This code here is for the system which doesn't have full SRAT
819 * table for possible cpus.
821 nid = acpi_map_pxm_to_node(pxm_id);
822 node_cpuid[cpu].phys_id = physid;
823 node_cpuid[cpu].nid = nid;
828 int additional_cpus __initdata = -1;
830 static __init int setup_additional_cpus(char *s)
833 additional_cpus = simple_strtol(s, NULL, 0);
838 early_param("additional_cpus", setup_additional_cpus);
841 * cpu_possible_map should be static, it cannot change as CPUs
842 * are onlined, or offlined. The reason is per-cpu data-structures
843 * are allocated by some modules at init time, and dont expect to
844 * do this dynamically on cpu arrival/departure.
845 * cpu_present_map on the other hand can change dynamically.
846 * In case when cpu_hotplug is not compiled, then we resort to current
847 * behaviour, which is cpu_possible == cpu_present.
850 * Three ways to find out the number of additional hotplug CPUs:
851 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
852 * - The user can overwrite it with additional_cpus=NUM
853 * - Otherwise don't reserve additional CPUs.
855 __init void prefill_possible_map(void)
858 int possible, disabled_cpus;
860 disabled_cpus = total_cpus - available_cpus;
862 if (additional_cpus == -1) {
863 if (disabled_cpus > 0)
864 additional_cpus = disabled_cpus;
869 possible = available_cpus + additional_cpus;
871 if (possible > nr_cpu_ids)
872 possible = nr_cpu_ids;
874 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
875 possible, max((possible - available_cpus), 0));
877 for (i = 0; i < possible; i++)
878 set_cpu_possible(i, true);
881 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
883 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
884 union acpi_object *obj;
885 struct acpi_madt_local_sapic *lsapic;
889 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
892 if (!buffer.length || !buffer.pointer)
895 obj = buffer.pointer;
896 if (obj->type != ACPI_TYPE_BUFFER)
898 kfree(buffer.pointer);
902 lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
904 if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
905 (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
906 kfree(buffer.pointer);
910 physid = ((lsapic->id << 8) | (lsapic->eid));
912 kfree(buffer.pointer);
913 buffer.length = ACPI_ALLOCATE_BUFFER;
914 buffer.pointer = NULL;
916 cpumask_complement(&tmp_map, cpu_present_mask);
917 cpu = cpumask_first(&tmp_map);
918 if (cpu >= nr_cpu_ids)
921 acpi_map_cpu2node(handle, cpu, physid);
923 cpu_set(cpu, cpu_present_map);
924 ia64_cpu_to_sapicid[cpu] = physid;
926 acpi_processor_set_pdc(handle);
932 EXPORT_SYMBOL(acpi_map_lsapic);
934 int acpi_unmap_lsapic(int cpu)
936 ia64_cpu_to_sapicid[cpu] = -1;
937 cpu_clear(cpu, cpu_present_map);
939 #ifdef CONFIG_ACPI_NUMA
940 /* NUMA specific cleanup's */
946 EXPORT_SYMBOL(acpi_unmap_lsapic);
947 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
949 #ifdef CONFIG_ACPI_NUMA
950 static acpi_status __devinit
951 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
953 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
954 union acpi_object *obj;
955 struct acpi_madt_io_sapic *iosapic;
956 unsigned int gsi_base;
959 /* Only care about objects w/ a method that returns the MADT */
960 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
963 if (!buffer.length || !buffer.pointer)
966 obj = buffer.pointer;
967 if (obj->type != ACPI_TYPE_BUFFER ||
968 obj->buffer.length < sizeof(*iosapic)) {
969 kfree(buffer.pointer);
973 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
975 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
976 kfree(buffer.pointer);
980 gsi_base = iosapic->global_irq_base;
982 kfree(buffer.pointer);
985 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
986 * us which node to associate this with.
988 pxm = acpi_get_pxm(handle);
992 node = pxm_to_node(pxm);
994 if (node >= MAX_NUMNODES || !node_online(node) ||
995 cpumask_empty(cpumask_of_node(node)))
998 /* We know a gsi to node mapping! */
999 map_iosapic_to_node(gsi_base, node);
1004 acpi_map_iosapics (void)
1006 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
1010 fs_initcall(acpi_map_iosapics);
1011 #endif /* CONFIG_ACPI_NUMA */
1013 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
1017 if ((err = iosapic_init(phys_addr, gsi_base)))
1020 #ifdef CONFIG_ACPI_NUMA
1021 acpi_map_iosapic(handle, 0, NULL, NULL);
1022 #endif /* CONFIG_ACPI_NUMA */
1027 EXPORT_SYMBOL(acpi_register_ioapic);
1029 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1031 return iosapic_remove(gsi_base);
1034 EXPORT_SYMBOL(acpi_unregister_ioapic);
1037 * acpi_save_state_mem() - save kernel state
1039 * TBD when when IA64 starts to support suspend...
1041 int acpi_save_state_mem(void) { return 0; }
1044 * do_suspend_lowlevel()
1046 void do_suspend_lowlevel(void) {}