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>
48 #include <asm/iosapic.h>
49 #include <asm/machvec.h>
51 #include <asm/system.h>
54 #include <asm/cyclone.h>
55 #include <asm/xen/hypervisor.h>
57 #define BAD_MADT_ENTRY(entry, end) ( \
58 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
59 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
61 #define PREFIX "ACPI: "
63 void (*pm_idle) (void);
64 EXPORT_SYMBOL(pm_idle);
65 void (*pm_power_off) (void);
66 EXPORT_SYMBOL(pm_power_off);
68 unsigned int acpi_cpei_override;
69 unsigned int acpi_cpei_phys_cpuid;
71 unsigned long acpi_wakeup_address = 0;
73 #ifdef CONFIG_IA64_GENERIC
74 static unsigned long __init acpi_find_rsdp(void)
76 unsigned long rsdp_phys = 0;
78 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
79 rsdp_phys = efi.acpi20;
80 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
81 printk(KERN_WARNING PREFIX
82 "v1.0/r0.71 tables no longer supported\n");
88 acpi_get_sysname(void)
90 #ifdef CONFIG_IA64_GENERIC
91 unsigned long rsdp_phys;
92 struct acpi_table_rsdp *rsdp;
93 struct acpi_table_xsdt *xsdt;
94 struct acpi_table_header *hdr;
96 rsdp_phys = acpi_find_rsdp();
99 "ACPI 2.0 RSDP not found, default to \"dig\"\n");
103 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
104 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
106 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
110 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
112 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
114 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
118 if (!strcmp(hdr->oem_id, "HP")) {
120 } else if (!strcmp(hdr->oem_id, "SGI")) {
121 if (!strcmp(hdr->oem_table_id + 4, "UV"))
125 } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
131 # if defined (CONFIG_IA64_HP_SIM)
133 # elif defined (CONFIG_IA64_HP_ZX1)
135 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
136 return "hpzx1_swiotlb";
137 # elif defined (CONFIG_IA64_SGI_SN2)
139 # elif defined (CONFIG_IA64_SGI_UV)
141 # elif defined (CONFIG_IA64_DIG)
143 # elif defined (CONFIG_IA64_XEN_GUEST)
146 # error Unknown platform. Fix acpi.c.
153 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
155 /* Array to record platform interrupt vectors for generic interrupt routing. */
156 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
157 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
160 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
163 * Interrupt routing API for device drivers. Provides interrupt vector for
164 * a generic platform event. Currently only CPEI is implemented.
166 int acpi_request_vector(u32 int_type)
170 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
171 /* corrected platform error interrupt */
172 vector = platform_intr_list[int_type];
175 "acpi_request_vector(): invalid interrupt type\n");
179 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
181 return __va(phys_addr);
184 /* --------------------------------------------------------------------------
185 Boot-time Table Parsing
186 -------------------------------------------------------------------------- */
188 static int total_cpus __initdata;
189 static int available_cpus __initdata;
190 struct acpi_table_madt *acpi_madt __initdata;
194 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
195 const unsigned long end)
197 struct acpi_madt_local_apic_override *lapic;
199 lapic = (struct acpi_madt_local_apic_override *)header;
201 if (BAD_MADT_ENTRY(lapic, end))
204 if (lapic->address) {
205 iounmap(ipi_base_addr);
206 ipi_base_addr = ioremap(lapic->address, 0);
212 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
214 struct acpi_madt_local_sapic *lsapic;
216 lsapic = (struct acpi_madt_local_sapic *)header;
218 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
220 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
222 smp_boot_data.cpu_phys_id[available_cpus] =
223 (lsapic->id << 8) | lsapic->eid;
233 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
235 struct acpi_madt_local_apic_nmi *lacpi_nmi;
237 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
239 if (BAD_MADT_ENTRY(lacpi_nmi, end))
242 /* TBD: Support lapic_nmi entries */
247 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
249 struct acpi_madt_io_sapic *iosapic;
251 iosapic = (struct acpi_madt_io_sapic *)header;
253 if (BAD_MADT_ENTRY(iosapic, end))
256 return iosapic_init(iosapic->address, iosapic->global_irq_base);
259 static unsigned int __initdata acpi_madt_rev;
262 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
263 const unsigned long end)
265 struct acpi_madt_interrupt_source *plintsrc;
268 plintsrc = (struct acpi_madt_interrupt_source *)header;
270 if (BAD_MADT_ENTRY(plintsrc, end))
274 * Get vector assignment for this interrupt, set attributes,
275 * and program the IOSAPIC routing table.
277 vector = iosapic_register_platform_intr(plintsrc->type,
278 plintsrc->global_irq,
279 plintsrc->io_sapic_vector,
282 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
283 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
284 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
285 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
286 ACPI_MADT_TRIGGER_EDGE) ?
287 IOSAPIC_EDGE : IOSAPIC_LEVEL);
289 platform_intr_list[plintsrc->type] = vector;
290 if (acpi_madt_rev > 1) {
291 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
295 * Save the physical id, so we can check when its being removed
297 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
302 #ifdef CONFIG_HOTPLUG_CPU
303 unsigned int can_cpei_retarget(void)
305 extern int cpe_vector;
306 extern unsigned int force_cpei_retarget;
309 * Only if CPEI is supported and the override flag
310 * is present, otherwise return that its re-targettable
311 * if we are in polling mode.
313 if (cpe_vector > 0) {
314 if (acpi_cpei_override || force_cpei_retarget)
322 unsigned int is_cpu_cpei_target(unsigned int cpu)
324 unsigned int logical_id;
326 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
328 if (logical_id == cpu)
334 void set_cpei_target_cpu(unsigned int cpu)
336 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
340 unsigned int get_cpei_target_cpu(void)
342 return acpi_cpei_phys_cpuid;
346 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
347 const unsigned long end)
349 struct acpi_madt_interrupt_override *p;
351 p = (struct acpi_madt_interrupt_override *)header;
353 if (BAD_MADT_ENTRY(p, end))
356 iosapic_override_isa_irq(p->source_irq, p->global_irq,
357 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
358 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
359 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
360 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
361 ACPI_MADT_TRIGGER_EDGE) ?
362 IOSAPIC_EDGE : IOSAPIC_LEVEL);
367 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
369 struct acpi_madt_nmi_source *nmi_src;
371 nmi_src = (struct acpi_madt_nmi_source *)header;
373 if (BAD_MADT_ENTRY(nmi_src, end))
376 /* TBD: Support nimsrc entries */
380 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
382 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
385 * Unfortunately ITC_DRIFT is not yet part of the
386 * official SAL spec, so the ITC_DRIFT bit is not
387 * set by the BIOS on this hardware.
389 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
395 static int __init acpi_parse_madt(struct acpi_table_header *table)
400 acpi_madt = (struct acpi_table_madt *)table;
402 acpi_madt_rev = acpi_madt->header.revision;
404 /* remember the value for reference after free_initmem() */
405 #ifdef CONFIG_ITANIUM
406 has_8259 = 1; /* Firmware on old Itanium systems is broken */
408 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
410 iosapic_system_init(has_8259);
412 /* Get base address of IPI Message Block */
414 if (acpi_madt->address)
415 ipi_base_addr = ioremap(acpi_madt->address, 0);
417 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
419 acpi_madt_oem_check(acpi_madt->header.oem_id,
420 acpi_madt->header.oem_table_id);
425 #ifdef CONFIG_ACPI_NUMA
429 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
431 static int __initdata srat_num_cpus; /* number of cpus */
432 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
433 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
434 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
435 static struct acpi_table_slit __initdata *slit_table;
436 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
438 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
442 pxm = pa->proximity_domain_lo;
443 if (ia64_platform_is("sn2"))
444 pxm += pa->proximity_domain_hi[0] << 8;
448 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
452 pxm = ma->proximity_domain;
453 if (!ia64_platform_is("sn2"))
460 * ACPI 2.0 SLIT (System Locality Information Table)
461 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
463 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
467 len = sizeof(struct acpi_table_header) + 8
468 + slit->locality_count * slit->locality_count;
469 if (slit->header.length != len) {
471 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
472 len, slit->header.length);
479 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
483 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
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(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(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
664 int __init acpi_boot_init(void)
670 * Parse the Multiple APIC Description Table (MADT), if exists.
671 * Note that this table provides platform SMP configuration
672 * information -- the successor to MPS tables.
675 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
676 printk(KERN_ERR PREFIX "Can't find MADT\n");
682 if (acpi_table_parse_madt
683 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
684 printk(KERN_ERR PREFIX
685 "Error parsing LAPIC address override entry\n");
687 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_lsapic, NR_CPUS)
689 printk(KERN_ERR PREFIX
690 "Error parsing MADT - no LAPIC entries\n");
692 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
694 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
698 if (acpi_table_parse_madt
699 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
700 if (!ia64_platform_is("sn2"))
701 printk(KERN_ERR PREFIX
702 "Error parsing MADT - no IOSAPIC entries\n");
705 /* System-Level Interrupt Routing */
707 if (acpi_table_parse_madt
708 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
709 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
710 printk(KERN_ERR PREFIX
711 "Error parsing platform interrupt source entry\n");
713 if (acpi_table_parse_madt
714 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
715 printk(KERN_ERR PREFIX
716 "Error parsing interrupt source overrides entry\n");
718 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
719 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
723 * FADT says whether a legacy keyboard controller is present.
724 * The FADT also contains an SCI_INT line, by which the system
725 * gets interrupts such as power and sleep buttons. If it's not
726 * on a Legacy interrupt, it needs to be setup.
728 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
729 printk(KERN_ERR PREFIX "Can't find FADT\n");
732 if (available_cpus == 0) {
733 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
734 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
735 smp_boot_data.cpu_phys_id[available_cpus] =
736 hard_smp_processor_id();
737 available_cpus = 1; /* We've got at least one of these, no? */
739 smp_boot_data.cpu_count = available_cpus;
742 # ifdef CONFIG_ACPI_NUMA
743 if (srat_num_cpus == 0) {
745 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
746 if (smp_boot_data.cpu_phys_id[cpu] !=
747 hard_smp_processor_id())
748 node_cpuid[i++].phys_id =
749 smp_boot_data.cpu_phys_id[cpu];
753 #ifdef CONFIG_ACPI_NUMA
754 build_cpu_to_node_map();
756 /* Make boot-up look pretty */
757 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
762 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
766 if (has_8259 && gsi < 16)
767 *irq = isa_irq_to_vector(gsi);
769 tmp = gsi_to_irq(gsi);
778 * ACPI based hotplug CPU support
780 #ifdef CONFIG_ACPI_HOTPLUG_CPU
782 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
784 #ifdef CONFIG_ACPI_NUMA
788 pxm_id = acpi_get_pxm(handle);
790 * We don't have cpu-only-node hotadd. But if the system equips
791 * SRAT table, pxm is already found and node is ready.
792 * So, just pxm_to_nid(pxm) is OK.
793 * This code here is for the system which doesn't have full SRAT
794 * table for possible cpus.
796 nid = acpi_map_pxm_to_node(pxm_id);
797 node_cpuid[cpu].phys_id = physid;
798 node_cpuid[cpu].nid = nid;
803 int additional_cpus __initdata = -1;
805 static __init int setup_additional_cpus(char *s)
808 additional_cpus = simple_strtol(s, NULL, 0);
813 early_param("additional_cpus", setup_additional_cpus);
816 * cpu_possible_map should be static, it cannot change as CPUs
817 * are onlined, or offlined. The reason is per-cpu data-structures
818 * are allocated by some modules at init time, and dont expect to
819 * do this dynamically on cpu arrival/departure.
820 * cpu_present_map on the other hand can change dynamically.
821 * In case when cpu_hotplug is not compiled, then we resort to current
822 * behaviour, which is cpu_possible == cpu_present.
825 * Three ways to find out the number of additional hotplug CPUs:
826 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
827 * - The user can overwrite it with additional_cpus=NUM
828 * - Otherwise don't reserve additional CPUs.
830 __init void prefill_possible_map(void)
833 int possible, disabled_cpus;
835 disabled_cpus = total_cpus - available_cpus;
837 if (additional_cpus == -1) {
838 if (disabled_cpus > 0)
839 additional_cpus = disabled_cpus;
844 possible = available_cpus + additional_cpus;
846 if (possible > NR_CPUS)
849 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
850 possible, max((possible - available_cpus), 0));
852 for (i = 0; i < possible; i++)
853 cpu_set(i, cpu_possible_map);
856 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
858 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
859 union acpi_object *obj;
860 struct acpi_madt_local_sapic *lsapic;
864 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
867 if (!buffer.length || !buffer.pointer)
870 obj = buffer.pointer;
871 if (obj->type != ACPI_TYPE_BUFFER)
873 kfree(buffer.pointer);
877 lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
879 if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
880 (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
881 kfree(buffer.pointer);
885 physid = ((lsapic->id << 8) | (lsapic->eid));
887 kfree(buffer.pointer);
888 buffer.length = ACPI_ALLOCATE_BUFFER;
889 buffer.pointer = NULL;
891 cpus_complement(tmp_map, cpu_present_map);
892 cpu = first_cpu(tmp_map);
896 acpi_map_cpu2node(handle, cpu, physid);
898 cpu_set(cpu, cpu_present_map);
899 ia64_cpu_to_sapicid[cpu] = physid;
905 EXPORT_SYMBOL(acpi_map_lsapic);
907 int acpi_unmap_lsapic(int cpu)
909 ia64_cpu_to_sapicid[cpu] = -1;
910 cpu_clear(cpu, cpu_present_map);
912 #ifdef CONFIG_ACPI_NUMA
913 /* NUMA specific cleanup's */
919 EXPORT_SYMBOL(acpi_unmap_lsapic);
920 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
922 #ifdef CONFIG_ACPI_NUMA
923 static acpi_status __devinit
924 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
926 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
927 union acpi_object *obj;
928 struct acpi_madt_io_sapic *iosapic;
929 unsigned int gsi_base;
932 /* Only care about objects w/ a method that returns the MADT */
933 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
936 if (!buffer.length || !buffer.pointer)
939 obj = buffer.pointer;
940 if (obj->type != ACPI_TYPE_BUFFER ||
941 obj->buffer.length < sizeof(*iosapic)) {
942 kfree(buffer.pointer);
946 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
948 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
949 kfree(buffer.pointer);
953 gsi_base = iosapic->global_irq_base;
955 kfree(buffer.pointer);
958 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
959 * us which node to associate this with.
961 pxm = acpi_get_pxm(handle);
965 node = pxm_to_node(pxm);
967 if (node >= MAX_NUMNODES || !node_online(node) ||
968 cpus_empty(node_to_cpumask(node)))
971 /* We know a gsi to node mapping! */
972 map_iosapic_to_node(gsi_base, node);
977 acpi_map_iosapics (void)
979 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
983 fs_initcall(acpi_map_iosapics);
984 #endif /* CONFIG_ACPI_NUMA */
986 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
990 if ((err = iosapic_init(phys_addr, gsi_base)))
993 #ifdef CONFIG_ACPI_NUMA
994 acpi_map_iosapic(handle, 0, NULL, NULL);
995 #endif /* CONFIG_ACPI_NUMA */
1000 EXPORT_SYMBOL(acpi_register_ioapic);
1002 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1004 return iosapic_remove(gsi_base);
1007 EXPORT_SYMBOL(acpi_unregister_ioapic);
1010 * acpi_save_state_mem() - save kernel state
1012 * TBD when when IA64 starts to support suspend...
1014 int acpi_save_state_mem(void) { return 0; }
1017 * acpi_restore_state()
1019 void acpi_restore_state_mem(void) {}
1022 * do_suspend_lowlevel()
1024 void do_suspend_lowlevel(void) {}
1026 #endif /* CONFIG_ACPI */