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>
56 #define BAD_MADT_ENTRY(entry, end) ( \
57 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
58 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
60 #define PREFIX "ACPI: "
62 void (*pm_idle) (void);
63 EXPORT_SYMBOL(pm_idle);
64 void (*pm_power_off) (void);
65 EXPORT_SYMBOL(pm_power_off);
67 unsigned int acpi_cpei_override;
68 unsigned int acpi_cpei_phys_cpuid;
70 #define MAX_SAPICS 256
71 u16 ia64_acpiid_to_sapicid[MAX_SAPICS] = {[0 ... MAX_SAPICS - 1] = -1 };
73 EXPORT_SYMBOL(ia64_acpiid_to_sapicid);
75 const char *acpi_get_sysname(void)
77 #ifdef CONFIG_IA64_GENERIC
78 unsigned long rsdp_phys;
79 struct acpi_table_rsdp *rsdp;
80 struct acpi_table_xsdt *xsdt;
81 struct acpi_table_header *hdr;
83 rsdp_phys = acpi_find_rsdp();
86 "ACPI 2.0 RSDP not found, default to \"dig\"\n");
90 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
91 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
93 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
97 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
99 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
101 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
105 if (!strcmp(hdr->oem_id, "HP")) {
107 } else if (!strcmp(hdr->oem_id, "SGI")) {
113 # if defined (CONFIG_IA64_HP_SIM)
115 # elif defined (CONFIG_IA64_HP_ZX1)
117 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
118 return "hpzx1_swiotlb";
119 # elif defined (CONFIG_IA64_SGI_SN2)
121 # elif defined (CONFIG_IA64_DIG)
124 # error Unknown platform. Fix acpi.c.
131 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
133 /* Array to record platform interrupt vectors for generic interrupt routing. */
134 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
135 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
138 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
141 * Interrupt routing API for device drivers. Provides interrupt vector for
142 * a generic platform event. Currently only CPEI is implemented.
144 int acpi_request_vector(u32 int_type)
148 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
149 /* corrected platform error interrupt */
150 vector = platform_intr_list[int_type];
153 "acpi_request_vector(): invalid interrupt type\n");
157 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
159 return __va(phys_addr);
162 /* --------------------------------------------------------------------------
163 Boot-time Table Parsing
164 -------------------------------------------------------------------------- */
166 static int total_cpus __initdata;
167 static int available_cpus __initdata;
168 struct acpi_table_madt *acpi_madt __initdata;
172 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
173 const unsigned long end)
175 struct acpi_madt_local_apic_override *lapic;
177 lapic = (struct acpi_madt_local_apic_override *)header;
179 if (BAD_MADT_ENTRY(lapic, end))
182 if (lapic->address) {
183 iounmap(ipi_base_addr);
184 ipi_base_addr = ioremap(lapic->address, 0);
190 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
192 struct acpi_madt_local_sapic *lsapic;
194 lsapic = (struct acpi_madt_local_sapic *)header;
196 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
198 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
200 smp_boot_data.cpu_phys_id[available_cpus] =
201 (lsapic->id << 8) | lsapic->eid;
203 ia64_acpiid_to_sapicid[lsapic->processor_id] =
204 (lsapic->id << 8) | lsapic->eid;
213 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
215 struct acpi_madt_local_apic_nmi *lacpi_nmi;
217 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
219 if (BAD_MADT_ENTRY(lacpi_nmi, end))
222 /* TBD: Support lapic_nmi entries */
227 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
229 struct acpi_madt_io_sapic *iosapic;
231 iosapic = (struct acpi_madt_io_sapic *)header;
233 if (BAD_MADT_ENTRY(iosapic, end))
236 return iosapic_init(iosapic->address, iosapic->global_irq_base);
239 static unsigned int __initdata acpi_madt_rev;
242 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
243 const unsigned long end)
245 struct acpi_madt_interrupt_source *plintsrc;
248 plintsrc = (struct acpi_madt_interrupt_source *)header;
250 if (BAD_MADT_ENTRY(plintsrc, end))
254 * Get vector assignment for this interrupt, set attributes,
255 * and program the IOSAPIC routing table.
257 vector = iosapic_register_platform_intr(plintsrc->type,
258 plintsrc->global_irq,
259 plintsrc->io_sapic_vector,
262 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
263 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
264 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
265 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
266 ACPI_MADT_TRIGGER_EDGE) ?
267 IOSAPIC_EDGE : IOSAPIC_LEVEL);
269 platform_intr_list[plintsrc->type] = vector;
270 if (acpi_madt_rev > 1) {
271 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
275 * Save the physical id, so we can check when its being removed
277 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
282 #ifdef CONFIG_HOTPLUG_CPU
283 unsigned int can_cpei_retarget(void)
285 extern int cpe_vector;
286 extern unsigned int force_cpei_retarget;
289 * Only if CPEI is supported and the override flag
290 * is present, otherwise return that its re-targettable
291 * if we are in polling mode.
293 if (cpe_vector > 0) {
294 if (acpi_cpei_override || force_cpei_retarget)
302 unsigned int is_cpu_cpei_target(unsigned int cpu)
304 unsigned int logical_id;
306 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
308 if (logical_id == cpu)
314 void set_cpei_target_cpu(unsigned int cpu)
316 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
320 unsigned int get_cpei_target_cpu(void)
322 return acpi_cpei_phys_cpuid;
326 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
327 const unsigned long end)
329 struct acpi_madt_interrupt_override *p;
331 p = (struct acpi_madt_interrupt_override *)header;
333 if (BAD_MADT_ENTRY(p, end))
336 iosapic_override_isa_irq(p->source_irq, p->global_irq,
337 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
338 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
339 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
340 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
341 ACPI_MADT_TRIGGER_EDGE) ?
342 IOSAPIC_EDGE : IOSAPIC_LEVEL);
347 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
349 struct acpi_madt_nmi_source *nmi_src;
351 nmi_src = (struct acpi_madt_nmi_source *)header;
353 if (BAD_MADT_ENTRY(nmi_src, end))
356 /* TBD: Support nimsrc entries */
360 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
362 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
365 * Unfortunately ITC_DRIFT is not yet part of the
366 * official SAL spec, so the ITC_DRIFT bit is not
367 * set by the BIOS on this hardware.
369 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
375 static int __init acpi_parse_madt(struct acpi_table_header *table)
380 acpi_madt = (struct acpi_table_madt *)table;
382 acpi_madt_rev = acpi_madt->header.revision;
384 /* remember the value for reference after free_initmem() */
385 #ifdef CONFIG_ITANIUM
386 has_8259 = 1; /* Firmware on old Itanium systems is broken */
388 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
390 iosapic_system_init(has_8259);
392 /* Get base address of IPI Message Block */
394 if (acpi_madt->address)
395 ipi_base_addr = ioremap(acpi_madt->address, 0);
397 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
399 acpi_madt_oem_check(acpi_madt->header.oem_id,
400 acpi_madt->header.oem_table_id);
405 #ifdef CONFIG_ACPI_NUMA
409 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
411 static int __initdata srat_num_cpus; /* number of cpus */
412 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
413 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
414 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
415 static struct acpi_table_slit __initdata *slit_table;
417 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
421 pxm = pa->proximity_domain_lo;
422 if (ia64_platform_is("sn2"))
423 pxm += pa->proximity_domain_hi[0] << 8;
427 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
431 pxm = ma->proximity_domain;
432 if (ia64_platform_is("sn2"))
433 pxm += ma->reserved << 8;
439 * ACPI 2.0 SLIT (System Locality Information Table)
440 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
442 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
446 len = sizeof(struct acpi_table_header) + 8
447 + slit->locality_count * slit->locality_count;
448 if (slit->header.length != len) {
450 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
451 len, slit->header.length);
452 memset(numa_slit, 10, sizeof(numa_slit));
459 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
463 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
466 pxm = get_processor_proximity_domain(pa);
468 /* record this node in proximity bitmap */
471 node_cpuid[srat_num_cpus].phys_id =
472 (pa->apic_id << 8) | (pa->local_sapic_eid);
473 /* nid should be overridden as logical node id later */
474 node_cpuid[srat_num_cpus].nid = pxm;
479 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
481 unsigned long paddr, size;
483 struct node_memblk_s *p, *q, *pend;
485 pxm = get_memory_proximity_domain(ma);
487 /* fill node memory chunk structure */
488 paddr = ma->base_address;
491 /* Ignore disabled entries */
492 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
495 /* record this node in proximity bitmap */
498 /* Insertion sort based on base address */
499 pend = &node_memblk[num_node_memblks];
500 for (p = &node_memblk[0]; p < pend; p++) {
501 if (paddr < p->start_paddr)
505 for (q = pend - 1; q >= p; q--)
508 p->start_paddr = paddr;
514 void __init acpi_numa_arch_fixup(void)
516 int i, j, node_from, node_to;
518 /* If there's no SRAT, fix the phys_id and mark node 0 online */
519 if (srat_num_cpus == 0) {
521 node_cpuid[0].phys_id = hard_smp_processor_id();
526 * MCD - This can probably be dropped now. No need for pxm ID to node ID
527 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
529 nodes_clear(node_online_map);
530 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
531 if (pxm_bit_test(i)) {
532 int nid = acpi_map_pxm_to_node(i);
533 node_set_online(nid);
537 /* set logical node id in memory chunk structure */
538 for (i = 0; i < num_node_memblks; i++)
539 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
541 /* assign memory bank numbers for each chunk on each node */
542 for_each_online_node(i) {
546 for (j = 0; j < num_node_memblks; j++)
547 if (node_memblk[j].nid == i)
548 node_memblk[j].bank = bank++;
551 /* set logical node id in cpu structure */
552 for (i = 0; i < srat_num_cpus; i++)
553 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
555 printk(KERN_INFO "Number of logical nodes in system = %d\n",
557 printk(KERN_INFO "Number of memory chunks in system = %d\n",
562 memset(numa_slit, -1, sizeof(numa_slit));
563 for (i = 0; i < slit_table->locality_count; i++) {
564 if (!pxm_bit_test(i))
566 node_from = pxm_to_node(i);
567 for (j = 0; j < slit_table->locality_count; j++) {
568 if (!pxm_bit_test(j))
570 node_to = pxm_to_node(j);
571 node_distance(node_from, node_to) =
572 slit_table->entry[i * slit_table->locality_count + j];
577 printk("ACPI 2.0 SLIT locality table:\n");
578 for_each_online_node(i) {
579 for_each_online_node(j)
580 printk("%03d ", node_distance(i, j));
585 #endif /* CONFIG_ACPI_NUMA */
588 * success: return IRQ number (>=0)
589 * failure: return < 0
591 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
593 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
596 if (has_8259 && gsi < 16)
597 return isa_irq_to_vector(gsi);
599 return iosapic_register_intr(gsi,
601 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
604 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
608 EXPORT_SYMBOL(acpi_register_gsi);
610 void acpi_unregister_gsi(u32 gsi)
612 iosapic_unregister_intr(gsi);
615 EXPORT_SYMBOL(acpi_unregister_gsi);
617 static int __init acpi_parse_fadt(struct acpi_table_header *table)
619 struct acpi_table_header *fadt_header;
620 struct acpi_table_fadt *fadt;
625 fadt_header = (struct acpi_table_header *)table;
626 if (fadt_header->revision != 3)
627 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
629 fadt = (struct acpi_table_fadt *)fadt_header;
631 acpi_register_gsi(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
635 unsigned long __init acpi_find_rsdp(void)
637 unsigned long rsdp_phys = 0;
639 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
640 rsdp_phys = efi.acpi20;
641 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
642 printk(KERN_WARNING PREFIX
643 "v1.0/r0.71 tables no longer supported\n");
647 int __init acpi_boot_init(void)
653 * Parse the Multiple APIC Description Table (MADT), if exists.
654 * Note that this table provides platform SMP configuration
655 * information -- the successor to MPS tables.
658 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt) < 1) {
659 printk(KERN_ERR PREFIX "Can't find MADT\n");
665 if (acpi_table_parse_madt
666 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
667 printk(KERN_ERR PREFIX
668 "Error parsing LAPIC address override entry\n");
670 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_lsapic, NR_CPUS)
672 printk(KERN_ERR PREFIX
673 "Error parsing MADT - no LAPIC entries\n");
675 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
677 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
681 if (acpi_table_parse_madt
682 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1)
683 printk(KERN_ERR PREFIX
684 "Error parsing MADT - no IOSAPIC entries\n");
686 /* System-Level Interrupt Routing */
688 if (acpi_table_parse_madt
689 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
690 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
691 printk(KERN_ERR PREFIX
692 "Error parsing platform interrupt source entry\n");
694 if (acpi_table_parse_madt
695 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
696 printk(KERN_ERR PREFIX
697 "Error parsing interrupt source overrides entry\n");
699 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
700 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
704 * FADT says whether a legacy keyboard controller is present.
705 * The FADT also contains an SCI_INT line, by which the system
706 * gets interrupts such as power and sleep buttons. If it's not
707 * on a Legacy interrupt, it needs to be setup.
709 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt) < 1)
710 printk(KERN_ERR PREFIX "Can't find FADT\n");
713 if (available_cpus == 0) {
714 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
715 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
716 smp_boot_data.cpu_phys_id[available_cpus] =
717 hard_smp_processor_id();
718 available_cpus = 1; /* We've got at least one of these, no? */
720 smp_boot_data.cpu_count = available_cpus;
723 # ifdef CONFIG_ACPI_NUMA
724 if (srat_num_cpus == 0) {
726 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
727 if (smp_boot_data.cpu_phys_id[cpu] !=
728 hard_smp_processor_id())
729 node_cpuid[i++].phys_id =
730 smp_boot_data.cpu_phys_id[cpu];
734 #ifdef CONFIG_ACPI_NUMA
735 build_cpu_to_node_map();
737 /* Make boot-up look pretty */
738 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
743 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
747 if (has_8259 && gsi < 16)
748 *irq = isa_irq_to_vector(gsi);
750 vector = gsi_to_vector(gsi);
760 * ACPI based hotplug CPU support
762 #ifdef CONFIG_ACPI_HOTPLUG_CPU
764 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
766 #ifdef CONFIG_ACPI_NUMA
770 pxm_id = acpi_get_pxm(handle);
772 * We don't have cpu-only-node hotadd. But if the system equips
773 * SRAT table, pxm is already found and node is ready.
774 * So, just pxm_to_nid(pxm) is OK.
775 * This code here is for the system which doesn't have full SRAT
776 * table for possible cpus.
778 nid = acpi_map_pxm_to_node(pxm_id);
779 node_cpuid[cpu].phys_id = physid;
780 node_cpuid[cpu].nid = nid;
785 int additional_cpus __initdata = -1;
787 static __init int setup_additional_cpus(char *s)
790 additional_cpus = simple_strtol(s, NULL, 0);
795 early_param("additional_cpus", setup_additional_cpus);
798 * cpu_possible_map should be static, it cannot change as cpu's
799 * are onlined, or offlined. The reason is per-cpu data-structures
800 * are allocated by some modules at init time, and dont expect to
801 * do this dynamically on cpu arrival/departure.
802 * cpu_present_map on the other hand can change dynamically.
803 * In case when cpu_hotplug is not compiled, then we resort to current
804 * behaviour, which is cpu_possible == cpu_present.
807 * Three ways to find out the number of additional hotplug CPUs:
808 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
809 * - The user can overwrite it with additional_cpus=NUM
810 * - Otherwise don't reserve additional CPUs.
812 __init void prefill_possible_map(void)
815 int possible, disabled_cpus;
817 disabled_cpus = total_cpus - available_cpus;
819 if (additional_cpus == -1) {
820 if (disabled_cpus > 0)
821 additional_cpus = disabled_cpus;
826 possible = available_cpus + additional_cpus;
828 if (possible > NR_CPUS)
831 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
832 possible, max((possible - available_cpus), 0));
834 for (i = 0; i < possible; i++)
835 cpu_set(i, cpu_possible_map);
838 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
840 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
841 union acpi_object *obj;
842 struct acpi_madt_local_sapic *lsapic;
847 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
850 if (!buffer.length || !buffer.pointer)
853 obj = buffer.pointer;
854 if (obj->type != ACPI_TYPE_BUFFER)
856 kfree(buffer.pointer);
860 lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
862 if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
863 (!lsapic->lapic_flags & ACPI_MADT_ENABLED)) {
864 kfree(buffer.pointer);
868 physid = ((lsapic->id << 8) | (lsapic->eid));
870 kfree(buffer.pointer);
871 buffer.length = ACPI_ALLOCATE_BUFFER;
872 buffer.pointer = NULL;
874 cpus_complement(tmp_map, cpu_present_map);
875 cpu = first_cpu(tmp_map);
879 acpi_map_cpu2node(handle, cpu, physid);
881 cpu_set(cpu, cpu_present_map);
882 ia64_cpu_to_sapicid[cpu] = physid;
883 ia64_acpiid_to_sapicid[lsapic->processor_id] = ia64_cpu_to_sapicid[cpu];
889 EXPORT_SYMBOL(acpi_map_lsapic);
891 int acpi_unmap_lsapic(int cpu)
895 for (i = 0; i < MAX_SAPICS; i++) {
896 if (ia64_acpiid_to_sapicid[i] == ia64_cpu_to_sapicid[cpu]) {
897 ia64_acpiid_to_sapicid[i] = -1;
901 ia64_cpu_to_sapicid[cpu] = -1;
902 cpu_clear(cpu, cpu_present_map);
904 #ifdef CONFIG_ACPI_NUMA
905 /* NUMA specific cleanup's */
911 EXPORT_SYMBOL(acpi_unmap_lsapic);
912 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
914 #ifdef CONFIG_ACPI_NUMA
915 static acpi_status __devinit
916 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
918 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
919 union acpi_object *obj;
920 struct acpi_madt_io_sapic *iosapic;
921 unsigned int gsi_base;
924 /* Only care about objects w/ a method that returns the MADT */
925 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
928 if (!buffer.length || !buffer.pointer)
931 obj = buffer.pointer;
932 if (obj->type != ACPI_TYPE_BUFFER ||
933 obj->buffer.length < sizeof(*iosapic)) {
934 kfree(buffer.pointer);
938 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
940 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
941 kfree(buffer.pointer);
945 gsi_base = iosapic->global_irq_base;
947 kfree(buffer.pointer);
950 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
951 * us which node to associate this with.
953 pxm = acpi_get_pxm(handle);
957 node = pxm_to_node(pxm);
959 if (node >= MAX_NUMNODES || !node_online(node) ||
960 cpus_empty(node_to_cpumask(node)))
963 /* We know a gsi to node mapping! */
964 map_iosapic_to_node(gsi_base, node);
969 acpi_map_iosapics (void)
971 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
975 fs_initcall(acpi_map_iosapics);
976 #endif /* CONFIG_ACPI_NUMA */
978 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
982 if ((err = iosapic_init(phys_addr, gsi_base)))
985 #ifdef CONFIG_ACPI_NUMA
986 acpi_map_iosapic(handle, 0, NULL, NULL);
987 #endif /* CONFIG_ACPI_NUMA */
992 EXPORT_SYMBOL(acpi_register_ioapic);
994 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
996 return iosapic_remove(gsi_base);
999 EXPORT_SYMBOL(acpi_unregister_ioapic);
1001 #endif /* CONFIG_ACPI */