2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/limits.h>
36 #include <sys/malloc.h>
41 #include <x86/apicreg.h>
42 #include <machine/intr_machdep.h>
43 #include <x86/apicvar.h>
44 #include <machine/md_var.h>
45 #include <x86/vmware.h>
47 #include <contrib/dev/acpica/include/acpi.h>
48 #include <contrib/dev/acpica/include/aclocal.h>
49 #include <contrib/dev/acpica/include/actables.h>
51 #include <dev/acpica/acpivar.h>
52 #include <dev/pci/pcivar.h>
54 /* These two arrays are indexed by APIC IDs. */
60 static struct lapic_info {
65 int madt_found_sci_override;
66 static ACPI_TABLE_MADT *madt;
67 static vm_paddr_t madt_physaddr;
68 static vm_offset_t madt_length;
70 static MALLOC_DEFINE(M_MADT, "madt_table", "ACPI MADT Table Items");
72 static enum intr_polarity interrupt_polarity(UINT16 IntiFlags, UINT8 Source);
73 static enum intr_trigger interrupt_trigger(UINT16 IntiFlags, UINT8 Source);
74 static int madt_find_cpu(u_int acpi_id, u_int *apic_id);
75 static int madt_find_interrupt(int intr, void **apic, u_int *pin);
76 static void madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg);
77 static void madt_parse_interrupt_override(
78 ACPI_MADT_INTERRUPT_OVERRIDE *intr);
79 static void madt_parse_ints(ACPI_SUBTABLE_HEADER *entry,
81 static void madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi);
82 static void madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi);
83 static int madt_probe(void);
84 static int madt_probe_cpus(void);
85 static void madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry,
87 static void madt_setup_cpus_handler(ACPI_SUBTABLE_HEADER *entry,
89 static void madt_register(void *dummy);
90 static int madt_setup_local(void);
91 static int madt_setup_io(void);
92 static void madt_walk_table(acpi_subtable_handler *handler, void *arg);
94 static struct apic_enumerator madt_enumerator = {
96 .apic_probe = madt_probe,
97 .apic_probe_cpus = madt_probe_cpus,
98 .apic_setup_local = madt_setup_local,
99 .apic_setup_io = madt_setup_io
103 * Look for an ACPI Multiple APIC Description Table ("APIC")
109 madt_physaddr = acpi_find_table(ACPI_SIG_MADT);
110 if (madt_physaddr == 0)
116 * Run through the MP table enumerating CPUs.
119 madt_probe_cpus(void)
122 madt = acpi_map_table(madt_physaddr, ACPI_SIG_MADT);
123 madt_length = madt->Header.Length;
124 KASSERT(madt != NULL, ("Unable to re-map MADT"));
125 madt_walk_table(madt_probe_cpus_handler, NULL);
126 acpi_unmap_table(madt);
132 * Initialize the local APIC on the BSP.
135 madt_setup_local(void)
137 ACPI_TABLE_DMAR *dmartbl;
138 vm_paddr_t dmartbl_physaddr;
145 if ((cpu_feature2 & CPUID2_X2APIC) != 0) {
149 * Automatically detect several configurations where
150 * x2APIC mode is known to cause troubles. User can
151 * override the setting with hw.x2apic_enable tunable.
153 dmartbl_physaddr = acpi_find_table(ACPI_SIG_DMAR);
154 if (dmartbl_physaddr != 0) {
155 dmartbl = acpi_map_table(dmartbl_physaddr,
157 if ((dmartbl->Flags & ACPI_DMAR_X2APIC_OPT_OUT) != 0)
158 reason = "by DMAR table";
159 acpi_unmap_table(dmartbl);
161 if (vm_guest == VM_GUEST_VMWARE) {
162 vmware_hvcall(VMW_HVCMD_GETVCPU_INFO, p);
163 if ((p[0] & VMW_VCPUINFO_VCPU_RESERVED) != 0 ||
164 (p[0] & VMW_VCPUINFO_LEGACY_X2APIC) == 0)
166 "inside VMWare without intr redirection";
167 } else if (vm_guest == VM_GUEST_XEN) {
168 reason = "due to running under XEN";
169 } else if (vm_guest == VM_GUEST_NO &&
170 CPUID_TO_FAMILY(cpu_id) == 0x6 &&
171 CPUID_TO_MODEL(cpu_id) == 0x2a) {
172 hw_vendor = kern_getenv("smbios.planar.maker");
174 * It seems that some Lenovo and ASUS
175 * SandyBridge-based notebook BIOSes have a
176 * bug which prevents booting AP in x2APIC
177 * mode. Since the only way to detect mobile
178 * CPU is to check northbridge pci id, which
179 * cannot be done that early, disable x2APIC
180 * for all Lenovo and ASUS SandyBridge
183 if (hw_vendor != NULL) {
184 if (!strcmp(hw_vendor, "LENOVO") ||
186 "ASUSTeK Computer Inc.")) {
188 "for a suspected SandyBridge BIOS bug";
193 bios_x2apic = lapic_is_x2apic();
194 if (reason != NULL && bios_x2apic) {
196 printf("x2APIC should be disabled %s but "
197 "already enabled by BIOS; enabling.\n",
203 else if (bootverbose)
204 printf("x2APIC available but disabled %s\n", reason);
205 user_x2apic = x2apic_mode;
206 TUNABLE_INT_FETCH("hw.x2apic_enable", &user_x2apic);
207 if (user_x2apic != x2apic_mode) {
208 if (bios_x2apic && !user_x2apic)
209 printf("x2APIC disabled by tunable and "
210 "enabled by BIOS; ignoring tunable.");
212 x2apic_mode = user_x2apic;
217 * Truncate max_apic_id if not in x2APIC mode. Some structures
218 * will already be allocated with the previous max_apic_id, but
219 * at least we can prevent wasting more memory elsewhere.
222 max_apic_id = min(max_apic_id, xAPIC_MAX_APIC_ID);
224 madt = pmap_mapbios(madt_physaddr, madt_length);
225 lapics = malloc(sizeof(*lapics) * (max_apic_id + 1), M_MADT,
227 madt_walk_table(madt_setup_cpus_handler, NULL);
229 lapic_init(madt->Address);
230 printf("ACPI APIC Table: <%.*s %.*s>\n",
231 (int)sizeof(madt->Header.OemId), madt->Header.OemId,
232 (int)sizeof(madt->Header.OemTableId), madt->Header.OemTableId);
235 * We ignore 64-bit local APIC override entries. Should we
236 * perhaps emit a warning here if we find one?
242 * Enumerate I/O APICs and setup interrupt sources.
251 KASSERT(lapics != NULL, ("local APICs not initialized"));
253 /* Try to initialize ACPI so that we can access the FADT. */
255 if (ACPI_FAILURE(i)) {
256 printf("MADT: ACPI Startup failed with %s\n",
257 AcpiFormatException(i));
258 printf("Try disabling either ACPI or apic support.\n");
259 panic("Using MADT but ACPI doesn't work");
262 ioapics = malloc(sizeof(*ioapics) * (IOAPIC_MAX_ID + 1), M_MADT,
265 /* First, we run through adding I/O APIC's. */
266 madt_walk_table(madt_parse_apics, NULL);
268 /* Second, we run through the table tweaking interrupt sources. */
269 madt_walk_table(madt_parse_ints, NULL);
272 * If there was not an explicit override entry for the SCI,
273 * force it to use level trigger and active-low polarity.
275 if (!madt_found_sci_override) {
276 if (madt_find_interrupt(AcpiGbl_FADT.SciInterrupt, &ioapic,
278 printf("MADT: Could not find APIC for SCI IRQ %u\n",
279 AcpiGbl_FADT.SciInterrupt);
282 "MADT: Forcing active-low polarity and level trigger for SCI\n");
283 ioapic_set_polarity(ioapic, pin, INTR_POLARITY_LOW);
284 ioapic_set_triggermode(ioapic, pin, INTR_TRIGGER_LEVEL);
288 /* Third, we register all the I/O APIC's. */
289 for (i = 0; i <= IOAPIC_MAX_ID; i++)
290 if (ioapics[i].io_apic != NULL)
291 ioapic_register(ioapics[i].io_apic);
293 /* Finally, we throw the switch to enable the I/O APIC's. */
294 acpi_SetDefaultIntrModel(ACPI_INTR_APIC);
296 free(ioapics, M_MADT);
299 /* NB: this is the last use of the lapics array. */
300 free(lapics, M_MADT);
307 madt_register(void *dummy __unused)
310 apic_register_enumerator(&madt_enumerator);
312 SYSINIT(madt_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST, madt_register, NULL);
315 * Call the handler routine for each entry in the MADT table.
318 madt_walk_table(acpi_subtable_handler *handler, void *arg)
321 acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length,
326 madt_parse_cpu(unsigned int apic_id, unsigned int flags)
329 if (!(flags & ACPI_MADT_ENABLED) ||
331 mp_ncpus == MAXCPU ||
333 apic_id > MAX_APIC_ID)
338 mp_maxid = mp_ncpus - 1;
340 max_apic_id = max(apic_id, max_apic_id);
344 madt_add_cpu(u_int acpi_id, u_int apic_id, u_int flags)
346 struct lapic_info *la;
349 * The MADT does not include a BSP flag, so we have to let the
350 * MP code figure out which CPU is the BSP on its own.
353 printf("MADT: Found CPU APIC ID %u ACPI ID %u: %s\n",
354 apic_id, acpi_id, flags & ACPI_MADT_ENABLED ?
355 "enabled" : "disabled");
356 if (!(flags & ACPI_MADT_ENABLED))
358 if (apic_id > max_apic_id) {
359 printf("MADT: Ignoring local APIC ID %u (too high)\n",
364 la = &lapics[apic_id];
365 KASSERT(la->la_enabled == 0, ("Duplicate local APIC ID %u", apic_id));
367 la->la_acpi_id = acpi_id;
368 lapic_create(apic_id, 0);
372 madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg)
374 ACPI_MADT_LOCAL_APIC *proc;
375 ACPI_MADT_LOCAL_X2APIC *x2apic;
377 switch (entry->Type) {
378 case ACPI_MADT_TYPE_LOCAL_APIC:
379 proc = (ACPI_MADT_LOCAL_APIC *)entry;
380 madt_parse_cpu(proc->Id, proc->LapicFlags);
382 case ACPI_MADT_TYPE_LOCAL_X2APIC:
383 x2apic = (ACPI_MADT_LOCAL_X2APIC *)entry;
384 madt_parse_cpu(x2apic->LocalApicId, x2apic->LapicFlags);
390 madt_setup_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg)
392 ACPI_MADT_LOCAL_APIC *proc;
393 ACPI_MADT_LOCAL_X2APIC *x2apic;
395 switch (entry->Type) {
396 case ACPI_MADT_TYPE_LOCAL_APIC:
397 proc = (ACPI_MADT_LOCAL_APIC *)entry;
398 madt_add_cpu(proc->ProcessorId, proc->Id, proc->LapicFlags);
400 case ACPI_MADT_TYPE_LOCAL_X2APIC:
401 x2apic = (ACPI_MADT_LOCAL_X2APIC *)entry;
402 madt_add_cpu(x2apic->Uid, x2apic->LocalApicId,
410 * Add an I/O APIC from an entry in the table.
413 madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg __unused)
415 ACPI_MADT_IO_APIC *apic;
417 switch (entry->Type) {
418 case ACPI_MADT_TYPE_IO_APIC:
419 apic = (ACPI_MADT_IO_APIC *)entry;
422 "MADT: Found IO APIC ID %u, Interrupt %u at %p\n",
423 apic->Id, apic->GlobalIrqBase,
424 (void *)(uintptr_t)apic->Address);
425 if (apic->Id > IOAPIC_MAX_ID)
426 panic("%s: I/O APIC ID %u too high", __func__,
428 if (ioapics[apic->Id].io_apic != NULL)
429 panic("%s: Double APIC ID %u", __func__, apic->Id);
430 ioapics[apic->Id].io_apic = ioapic_create(apic->Address,
431 apic->Id, apic->GlobalIrqBase);
432 ioapics[apic->Id].io_vector = apic->GlobalIrqBase;
440 * Determine properties of an interrupt source. Note that for ACPI these
441 * functions are only used for ISA interrupts, so we assume ISA bus values
442 * (Active Hi, Edge Triggered) for conforming values except for the ACPI
443 * SCI for which we use Active Lo, Level Triggered.
445 static enum intr_polarity
446 interrupt_polarity(UINT16 IntiFlags, UINT8 Source)
449 switch (IntiFlags & ACPI_MADT_POLARITY_MASK) {
451 printf("WARNING: Bogus Interrupt Polarity. Assume CONFORMS\n");
453 case ACPI_MADT_POLARITY_CONFORMS:
454 if (Source == AcpiGbl_FADT.SciInterrupt)
455 return (INTR_POLARITY_LOW);
457 return (INTR_POLARITY_HIGH);
458 case ACPI_MADT_POLARITY_ACTIVE_HIGH:
459 return (INTR_POLARITY_HIGH);
460 case ACPI_MADT_POLARITY_ACTIVE_LOW:
461 return (INTR_POLARITY_LOW);
465 static enum intr_trigger
466 interrupt_trigger(UINT16 IntiFlags, UINT8 Source)
469 switch (IntiFlags & ACPI_MADT_TRIGGER_MASK) {
471 printf("WARNING: Bogus Interrupt Trigger Mode. Assume CONFORMS.\n");
473 case ACPI_MADT_TRIGGER_CONFORMS:
474 if (Source == AcpiGbl_FADT.SciInterrupt)
475 return (INTR_TRIGGER_LEVEL);
477 return (INTR_TRIGGER_EDGE);
478 case ACPI_MADT_TRIGGER_EDGE:
479 return (INTR_TRIGGER_EDGE);
480 case ACPI_MADT_TRIGGER_LEVEL:
481 return (INTR_TRIGGER_LEVEL);
486 * Find the local APIC ID associated with a given ACPI Processor ID.
489 madt_find_cpu(u_int acpi_id, u_int *apic_id)
493 for (i = 0; i <= max_apic_id; i++) {
494 if (!lapics[i].la_enabled)
496 if (lapics[i].la_acpi_id != acpi_id)
505 * Find the IO APIC and pin on that APIC associated with a given global
509 madt_find_interrupt(int intr, void **apic, u_int *pin)
514 for (i = 0; i <= IOAPIC_MAX_ID; i++) {
515 if (ioapics[i].io_apic == NULL ||
516 ioapics[i].io_vector > intr)
519 ioapics[best].io_vector < ioapics[i].io_vector)
524 *apic = ioapics[best].io_apic;
525 *pin = intr - ioapics[best].io_vector;
527 printf("WARNING: Found intpin of %u for vector %d\n", *pin,
533 madt_parse_interrupt_values(void *entry,
534 enum intr_trigger *trig, enum intr_polarity *pol)
536 ACPI_MADT_INTERRUPT_OVERRIDE *intr;
542 printf("MADT: Interrupt override: source %u, irq %u\n",
543 intr->SourceIrq, intr->GlobalIrq);
544 KASSERT(intr->Bus == 0, ("bus for interrupt overrides must be zero"));
547 * Lookup the appropriate trigger and polarity modes for this
550 *trig = interrupt_trigger(intr->IntiFlags, intr->SourceIrq);
551 *pol = interrupt_polarity(intr->IntiFlags, intr->SourceIrq);
554 * If the SCI is identity mapped but has edge trigger and
555 * active-hi polarity or the force_sci_lo tunable is set,
556 * force it to use level/lo.
558 if (intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) {
559 madt_found_sci_override = 1;
560 if (getenv_string("hw.acpi.sci.trigger", buf, sizeof(buf))) {
561 if (tolower(buf[0]) == 'e')
562 *trig = INTR_TRIGGER_EDGE;
563 else if (tolower(buf[0]) == 'l')
564 *trig = INTR_TRIGGER_LEVEL;
567 "Invalid trigger %s: must be 'edge' or 'level'",
569 printf("MADT: Forcing SCI to %s trigger\n",
570 *trig == INTR_TRIGGER_EDGE ? "edge" : "level");
572 if (getenv_string("hw.acpi.sci.polarity", buf, sizeof(buf))) {
573 if (tolower(buf[0]) == 'h')
574 *pol = INTR_POLARITY_HIGH;
575 else if (tolower(buf[0]) == 'l')
576 *pol = INTR_POLARITY_LOW;
579 "Invalid polarity %s: must be 'high' or 'low'",
581 printf("MADT: Forcing SCI to active %s polarity\n",
582 *pol == INTR_POLARITY_HIGH ? "high" : "low");
588 * Parse an interrupt source override for an ISA interrupt.
591 madt_parse_interrupt_override(ACPI_MADT_INTERRUPT_OVERRIDE *intr)
593 void *new_ioapic, *old_ioapic;
594 u_int new_pin, old_pin;
595 enum intr_trigger trig;
596 enum intr_polarity pol;
598 if (acpi_quirks & ACPI_Q_MADT_IRQ0 && intr->SourceIrq == 0 &&
599 intr->GlobalIrq == 2) {
601 printf("MADT: Skipping timer override\n");
605 if (madt_find_interrupt(intr->GlobalIrq, &new_ioapic, &new_pin) != 0) {
606 printf("MADT: Could not find APIC for vector %u (IRQ %u)\n",
607 intr->GlobalIrq, intr->SourceIrq);
611 madt_parse_interrupt_values(intr, &trig, &pol);
613 /* Remap the IRQ if it is mapped to a different interrupt vector. */
614 if (intr->SourceIrq != intr->GlobalIrq) {
616 * If the SCI is remapped to a non-ISA global interrupt,
617 * then override the vector we use to setup and allocate
620 if (intr->GlobalIrq > 15 &&
621 intr->SourceIrq == AcpiGbl_FADT.SciInterrupt)
622 acpi_OverrideInterruptLevel(intr->GlobalIrq);
624 ioapic_remap_vector(new_ioapic, new_pin,
626 if (madt_find_interrupt(intr->SourceIrq, &old_ioapic,
628 printf("MADT: Could not find APIC for source IRQ %u\n",
630 else if (ioapic_get_vector(old_ioapic, old_pin) ==
632 ioapic_disable_pin(old_ioapic, old_pin);
635 /* Program the polarity and trigger mode. */
636 ioapic_set_triggermode(new_ioapic, new_pin, trig);
637 ioapic_set_polarity(new_ioapic, new_pin, pol);
641 * Parse an entry for an NMI routed to an IO APIC.
644 madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi)
649 if (madt_find_interrupt(nmi->GlobalIrq, &ioapic, &pin) != 0) {
650 printf("MADT: Could not find APIC for vector %u\n",
655 ioapic_set_nmi(ioapic, pin);
656 if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS))
657 ioapic_set_triggermode(ioapic, pin,
658 interrupt_trigger(nmi->IntiFlags, 0));
659 if (!(nmi->IntiFlags & ACPI_MADT_POLARITY_CONFORMS))
660 ioapic_set_polarity(ioapic, pin,
661 interrupt_polarity(nmi->IntiFlags, 0));
665 * Parse an entry for an NMI routed to a local APIC LVT pin.
668 madt_handle_local_nmi(u_int acpi_id, UINT8 Lint, UINT16 IntiFlags)
672 if (acpi_id == 0xffffffff)
673 apic_id = APIC_ID_ALL;
674 else if (madt_find_cpu(acpi_id, &apic_id) != 0) {
676 printf("MADT: Ignoring local NMI routed to "
677 "ACPI CPU %u\n", acpi_id);
681 pin = APIC_LVT_LINT0;
683 pin = APIC_LVT_LINT1;
684 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_NMI);
685 if (!(IntiFlags & ACPI_MADT_TRIGGER_CONFORMS))
686 lapic_set_lvt_triggermode(apic_id, pin,
687 interrupt_trigger(IntiFlags, 0));
688 if (!(IntiFlags & ACPI_MADT_POLARITY_CONFORMS))
689 lapic_set_lvt_polarity(apic_id, pin,
690 interrupt_polarity(IntiFlags, 0));
694 madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi)
697 madt_handle_local_nmi(nmi->ProcessorId == 0xff ? 0xffffffff :
698 nmi->ProcessorId, nmi->Lint, nmi->IntiFlags);
702 madt_parse_local_x2apic_nmi(ACPI_MADT_LOCAL_X2APIC_NMI *nmi)
705 madt_handle_local_nmi(nmi->Uid, nmi->Lint, nmi->IntiFlags);
709 * Parse interrupt entries.
712 madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, void *arg __unused)
715 switch (entry->Type) {
716 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
717 madt_parse_interrupt_override(
718 (ACPI_MADT_INTERRUPT_OVERRIDE *)entry);
720 case ACPI_MADT_TYPE_NMI_SOURCE:
721 madt_parse_nmi((ACPI_MADT_NMI_SOURCE *)entry);
723 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
724 madt_parse_local_nmi((ACPI_MADT_LOCAL_APIC_NMI *)entry);
726 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
727 madt_parse_local_x2apic_nmi(
728 (ACPI_MADT_LOCAL_X2APIC_NMI *)entry);
734 * Setup per-CPU ACPI IDs.
737 madt_set_ids(void *dummy)
739 struct lapic_info *la;
746 KASSERT(lapics != NULL, ("local APICs not initialized"));
750 KASSERT(pc != NULL, ("no pcpu data for CPU %u", i));
751 la = &lapics[pc->pc_apic_id];
753 panic("APIC: CPU with APIC ID %u is not enabled",
755 pc->pc_acpi_id = la->la_acpi_id;
757 printf("APIC: CPU %u has ACPI ID %u\n", i,
761 SYSINIT(madt_set_ids, SI_SUB_CPU, SI_ORDER_MIDDLE, madt_set_ids, NULL);