xref: /freebsd/sys/x86/acpica/madt.c (revision 9bc300465e48e19d794d88d0c158a2adb92c7197)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
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.
14  *
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
25  * SUCH DAMAGE.
26  */
27 
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/bus.h>
31 #include <sys/kernel.h>
32 #include <sys/limits.h>
33 #include <sys/malloc.h>
34 #include <sys/smp.h>
35 #include <vm/vm.h>
36 #include <vm/pmap.h>
37 
38 #include <x86/apicreg.h>
39 #include <machine/intr_machdep.h>
40 #include <x86/apicvar.h>
41 #include <machine/md_var.h>
42 #include <x86/vmware.h>
43 
44 #include <contrib/dev/acpica/include/acpi.h>
45 #include <contrib/dev/acpica/include/aclocal.h>
46 #include <contrib/dev/acpica/include/actables.h>
47 
48 #include <dev/acpica/acpivar.h>
49 #include <dev/pci/pcivar.h>
50 
51 /* These two arrays are indexed by APIC IDs. */
52 static struct {
53 	void *io_apic;
54 	UINT32 io_vector;
55 } *ioapics;
56 
57 static struct lapic_info {
58 	u_int la_enabled;
59 	u_int la_acpi_id;
60 } *lapics;
61 
62 int madt_found_sci_override;
63 static ACPI_TABLE_MADT *madt;
64 static vm_paddr_t madt_physaddr;
65 static vm_offset_t madt_length;
66 
67 static MALLOC_DEFINE(M_MADT, "madt_table", "ACPI MADT Table Items");
68 
69 static enum intr_polarity interrupt_polarity(UINT16 IntiFlags, UINT8 Source);
70 static enum intr_trigger interrupt_trigger(UINT16 IntiFlags, UINT8 Source);
71 static int	madt_find_cpu(u_int acpi_id, u_int *apic_id);
72 static int	madt_find_interrupt(int intr, void **apic, u_int *pin);
73 static void	madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg);
74 static void	madt_parse_interrupt_override(
75 		    ACPI_MADT_INTERRUPT_OVERRIDE *intr);
76 static void	madt_parse_ints(ACPI_SUBTABLE_HEADER *entry,
77 		    void *arg __unused);
78 static void	madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi);
79 static void	madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi);
80 static int	madt_probe(void);
81 static int	madt_probe_cpus(void);
82 static void	madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry,
83 		    void *arg __unused);
84 static void	madt_setup_cpus_handler(ACPI_SUBTABLE_HEADER *entry,
85 		    void *arg __unused);
86 static void	madt_register(void *dummy);
87 static int	madt_setup_local(void);
88 static int	madt_setup_io(void);
89 static void	madt_walk_table(acpi_subtable_handler *handler, void *arg);
90 
91 static struct apic_enumerator madt_enumerator = {
92 	.apic_name = "MADT",
93 	.apic_probe = madt_probe,
94 	.apic_probe_cpus = madt_probe_cpus,
95 	.apic_setup_local = madt_setup_local,
96 	.apic_setup_io = madt_setup_io
97 };
98 
99 /*
100  * Look for an ACPI Multiple APIC Description Table ("APIC")
101  */
102 static int
103 madt_probe(void)
104 {
105 
106 	madt_physaddr = acpi_find_table(ACPI_SIG_MADT);
107 	if (madt_physaddr == 0)
108 		return (ENXIO);
109 	return (-50);
110 }
111 
112 /*
113  * Run through the MP table enumerating CPUs.
114  */
115 static int
116 madt_probe_cpus(void)
117 {
118 
119 	madt = acpi_map_table(madt_physaddr, ACPI_SIG_MADT);
120 	madt_length = madt->Header.Length;
121 	KASSERT(madt != NULL, ("Unable to re-map MADT"));
122 	madt_walk_table(madt_probe_cpus_handler, NULL);
123 	acpi_unmap_table(madt);
124 	madt = NULL;
125 	return (0);
126 }
127 
128 static const char *x2apic_sandy_dis[] = {
129 	"LENOVO",
130 	"ASUSTeK Computer Inc.",
131 	"SAMSUNG ELECTRONICS CO., LTD.",
132 };
133 
134 /*
135  * Automatically detect several configurations where x2APIC mode is
136  * known to cause troubles.  User can override the setting with
137  * hw.x2apic_enable tunable.
138  */
139 static const char *
140 madt_x2apic_disable_reason(void)
141 {
142 	ACPI_TABLE_DMAR *dmartbl;
143 	vm_paddr_t dmartbl_physaddr;
144 	const char *reason;
145 	char *hw_vendor;
146 	u_int p[4];
147 	int i;
148 
149 	reason = NULL;
150 
151 	dmartbl_physaddr = acpi_find_table(ACPI_SIG_DMAR);
152 	if (dmartbl_physaddr != 0) {
153 		dmartbl = acpi_map_table(dmartbl_physaddr, ACPI_SIG_DMAR);
154 		if ((dmartbl->Flags & ACPI_DMAR_X2APIC_OPT_OUT) != 0)
155 			reason = "by DMAR table";
156 		acpi_unmap_table(dmartbl);
157 		if (reason != NULL)
158 			return (reason);
159 	}
160 
161 	if (vm_guest == VM_GUEST_VMWARE) {
162 		vmware_hvcall(0, VMW_HVCMD_GETVCPU_INFO,
163 		    VMW_HVCMD_DEFAULT_PARAM, p);
164 		if ((p[0] & VMW_VCPUINFO_VCPU_RESERVED) != 0 ||
165 		    (p[0] & VMW_VCPUINFO_LEGACY_X2APIC) == 0)
166 			return ("inside VMWare without intr redirection");
167 	}
168 
169 	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");
173 		/*
174 		 * It seems that some SandyBridge-based notebook
175 		 * BIOSes have a bug which prevents booting AP in
176 		 * x2APIC mode.  Since the only way to detect mobile
177 		 * CPU is to check northbridge pci id, which cannot be
178 		 * done that early, disable x2APIC for all such
179 		 * machines.
180 		 */
181 		if (hw_vendor != NULL) {
182 			for (i = 0; i < nitems(x2apic_sandy_dis); i++) {
183 				if (strcmp(hw_vendor, x2apic_sandy_dis[i]) ==
184 				    0) {
185 					reason =
186 				"for a suspected SandyBridge BIOS bug";
187 					break;
188 				}
189 			}
190 			freeenv(hw_vendor);
191 		}
192 		if (reason != NULL)
193 			return (reason);
194 	}
195 
196 	return (NULL);
197 }
198 
199 /*
200  * Initialize the local APIC on the BSP.
201  */
202 static int
203 madt_setup_local(void)
204 {
205 	const char *reason;
206 	int user_x2apic;
207 	bool bios_x2apic;
208 
209 	if ((cpu_feature2 & CPUID2_X2APIC) != 0) {
210 		reason = madt_x2apic_disable_reason();
211 		bios_x2apic = lapic_is_x2apic();
212 		if (reason != NULL && bios_x2apic) {
213 			if (bootverbose)
214 				printf("x2APIC should be disabled %s but "
215 				    "already enabled by BIOS; enabling.\n",
216 				     reason);
217 			reason = NULL;
218 		}
219 		if (reason == NULL)
220 			x2apic_mode = 1;
221 		else if (bootverbose)
222 			printf("x2APIC available but disabled %s\n", reason);
223 		user_x2apic = x2apic_mode;
224 		TUNABLE_INT_FETCH("hw.apic.x2apic_mode", &user_x2apic);
225 		if (user_x2apic != x2apic_mode) {
226 			if (bios_x2apic && !user_x2apic)
227 				printf("x2APIC disabled by tunable and "
228 				    "enabled by BIOS; ignoring tunable.");
229 			else
230 				x2apic_mode = user_x2apic;
231 		}
232 	}
233 
234 	/*
235 	 * Truncate max_apic_id if not in x2APIC mode. Some structures
236 	 * will already be allocated with the previous max_apic_id, but
237 	 * at least we can prevent wasting more memory elsewhere.
238 	 */
239 	if (!x2apic_mode)
240 		max_apic_id = min(max_apic_id, xAPIC_MAX_APIC_ID);
241 
242 	madt = pmap_mapbios(madt_physaddr, madt_length);
243 	lapics = malloc(sizeof(*lapics) * (max_apic_id + 1), M_MADT,
244 	    M_WAITOK | M_ZERO);
245 	madt_walk_table(madt_setup_cpus_handler, NULL);
246 
247 	lapic_init(madt->Address);
248 	printf("ACPI APIC Table: <%.*s %.*s>\n",
249 	    (int)sizeof(madt->Header.OemId), madt->Header.OemId,
250 	    (int)sizeof(madt->Header.OemTableId), madt->Header.OemTableId);
251 
252 	/*
253 	 * We ignore 64-bit local APIC override entries.  Should we
254 	 * perhaps emit a warning here if we find one?
255 	 */
256 	return (0);
257 }
258 
259 /*
260  * Enumerate I/O APICs and setup interrupt sources.
261  */
262 static int
263 madt_setup_io(void)
264 {
265 	void *ioapic;
266 	u_int pin;
267 	int i;
268 
269 	KASSERT(lapics != NULL, ("local APICs not initialized"));
270 
271 	/* Try to initialize ACPI so that we can access the FADT. */
272 	i = acpi_Startup();
273 	if (ACPI_FAILURE(i)) {
274 		printf("MADT: ACPI Startup failed with %s\n",
275 		    AcpiFormatException(i));
276 		printf("Try disabling either ACPI or apic support.\n");
277 		panic("Using MADT but ACPI doesn't work");
278 	}
279 
280 	ioapics = malloc(sizeof(*ioapics) * (IOAPIC_MAX_ID + 1), M_MADT,
281 	    M_WAITOK | M_ZERO);
282 
283 	/* First, we run through adding I/O APIC's. */
284 	madt_walk_table(madt_parse_apics, NULL);
285 
286 	/* Second, we run through the table tweaking interrupt sources. */
287 	madt_walk_table(madt_parse_ints, NULL);
288 
289 	/*
290 	 * If there was not an explicit override entry for the SCI,
291 	 * force it to use level trigger and active-low polarity.
292 	 */
293 	if (!madt_found_sci_override) {
294 		if (madt_find_interrupt(AcpiGbl_FADT.SciInterrupt, &ioapic,
295 		    &pin) != 0)
296 			printf("MADT: Could not find APIC for SCI IRQ %u\n",
297 			    AcpiGbl_FADT.SciInterrupt);
298 		else {
299 			printf(
300 	"MADT: Forcing active-low polarity and level trigger for SCI\n");
301 			ioapic_set_polarity(ioapic, pin, INTR_POLARITY_LOW);
302 			ioapic_set_triggermode(ioapic, pin, INTR_TRIGGER_LEVEL);
303 		}
304 	}
305 
306 	/* Third, we register all the I/O APIC's. */
307 	for (i = 0; i <= IOAPIC_MAX_ID; i++)
308 		if (ioapics[i].io_apic != NULL)
309 			ioapic_register(ioapics[i].io_apic);
310 
311 	/* Finally, we throw the switch to enable the I/O APIC's. */
312 	acpi_SetDefaultIntrModel(ACPI_INTR_APIC);
313 
314 	free(ioapics, M_MADT);
315 	ioapics = NULL;
316 
317 	/* NB: this is the last use of the lapics array. */
318 	free(lapics, M_MADT);
319 	lapics = NULL;
320 
321 	return (0);
322 }
323 
324 static void
325 madt_register(void *dummy __unused)
326 {
327 
328 	apic_register_enumerator(&madt_enumerator);
329 }
330 SYSINIT(madt_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST, madt_register, NULL);
331 
332 /*
333  * Call the handler routine for each entry in the MADT table.
334  */
335 static void
336 madt_walk_table(acpi_subtable_handler *handler, void *arg)
337 {
338 
339 	acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length,
340 	    handler, arg);
341 }
342 
343 static void
344 madt_parse_cpu(unsigned int apic_id, unsigned int flags)
345 {
346 
347 	if (!(flags & ACPI_MADT_ENABLED) ||
348 #ifdef SMP
349 	    mp_ncpus == MAXCPU ||
350 #endif
351 	    apic_id > MAX_APIC_ID)
352 		return;
353 
354 #ifdef SMP
355 	mp_ncpus++;
356 	mp_maxid = mp_ncpus - 1;
357 #endif
358 	max_apic_id = max(apic_id, max_apic_id);
359 }
360 
361 static void
362 madt_add_cpu(u_int acpi_id, u_int apic_id, u_int flags)
363 {
364 	struct lapic_info *la;
365 
366 	/*
367 	 * The MADT does not include a BSP flag, so we have to let the
368 	 * MP code figure out which CPU is the BSP on its own.
369 	 */
370 	if (bootverbose)
371 		printf("MADT: Found CPU APIC ID %d ACPI ID %u: %s\n",
372 		    (int)apic_id, acpi_id, flags & ACPI_MADT_ENABLED ?
373 		    "enabled" : "disabled");
374 	if (!(flags & ACPI_MADT_ENABLED))
375 		return;
376 	if (apic_id > max_apic_id) {
377 		printf("MADT: Ignoring local APIC ID %u (too high)\n",
378 		    apic_id);
379 		return;
380 	}
381 
382 	la = &lapics[apic_id];
383 	KASSERT(la->la_enabled == 0, ("Duplicate local APIC ID %u", apic_id));
384 	la->la_enabled = 1;
385 	la->la_acpi_id = acpi_id;
386 	lapic_create(apic_id, 0);
387 }
388 
389 static void
390 madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg)
391 {
392 	ACPI_MADT_LOCAL_APIC *proc;
393 	ACPI_MADT_LOCAL_X2APIC *x2apic;
394 
395 	switch (entry->Type) {
396 	case ACPI_MADT_TYPE_LOCAL_APIC:
397 		proc = (ACPI_MADT_LOCAL_APIC *)entry;
398 		madt_parse_cpu(proc->Id, proc->LapicFlags);
399 		break;
400 	case ACPI_MADT_TYPE_LOCAL_X2APIC:
401 		x2apic = (ACPI_MADT_LOCAL_X2APIC *)entry;
402 		madt_parse_cpu(x2apic->LocalApicId, x2apic->LapicFlags);
403 		break;
404 	}
405 }
406 
407 static void
408 madt_setup_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg)
409 {
410 	ACPI_MADT_LOCAL_APIC *proc;
411 	ACPI_MADT_LOCAL_X2APIC *x2apic;
412 
413 	switch (entry->Type) {
414 	case ACPI_MADT_TYPE_LOCAL_APIC:
415 		proc = (ACPI_MADT_LOCAL_APIC *)entry;
416 		madt_add_cpu(proc->ProcessorId, proc->Id, proc->LapicFlags);
417 		break;
418 	case ACPI_MADT_TYPE_LOCAL_X2APIC:
419 		x2apic = (ACPI_MADT_LOCAL_X2APIC *)entry;
420 		madt_add_cpu(x2apic->Uid, x2apic->LocalApicId,
421 		    x2apic->LapicFlags);
422 		break;
423 	}
424 }
425 
426 /*
427  * Add an I/O APIC from an entry in the table.
428  */
429 static void
430 madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg __unused)
431 {
432 	ACPI_MADT_IO_APIC *apic;
433 
434 	switch (entry->Type) {
435 	case ACPI_MADT_TYPE_IO_APIC:
436 		apic = (ACPI_MADT_IO_APIC *)entry;
437 		if (bootverbose)
438 			printf(
439 			    "MADT: Found IO APIC ID %u, Interrupt %u at %p\n",
440 			    apic->Id, apic->GlobalIrqBase,
441 			    (void *)(uintptr_t)apic->Address);
442 		if (apic->Id > IOAPIC_MAX_ID)
443 			panic("%s: I/O APIC ID %u too high", __func__,
444 			    apic->Id);
445 		if (ioapics[apic->Id].io_apic != NULL)
446 			panic("%s: Double APIC ID %u", __func__, apic->Id);
447 		ioapics[apic->Id].io_apic = ioapic_create(apic->Address,
448 		    apic->Id, apic->GlobalIrqBase);
449 		ioapics[apic->Id].io_vector = apic->GlobalIrqBase;
450 		break;
451 	default:
452 		break;
453 	}
454 }
455 
456 /*
457  * Determine properties of an interrupt source.  Note that for ACPI these
458  * functions are only used for ISA interrupts, so we assume ISA bus values
459  * (Active Hi, Edge Triggered) for conforming values except for the ACPI
460  * SCI for which we use Active Lo, Level Triggered.
461  */
462 static enum intr_polarity
463 interrupt_polarity(UINT16 IntiFlags, UINT8 Source)
464 {
465 
466 	switch (IntiFlags & ACPI_MADT_POLARITY_MASK) {
467 	default:
468 		printf("WARNING: Bogus Interrupt Polarity. Assume CONFORMS\n");
469 		/* FALLTHROUGH*/
470 	case ACPI_MADT_POLARITY_CONFORMS:
471 		if (Source == AcpiGbl_FADT.SciInterrupt)
472 			return (INTR_POLARITY_LOW);
473 		else
474 			return (INTR_POLARITY_HIGH);
475 	case ACPI_MADT_POLARITY_ACTIVE_HIGH:
476 		return (INTR_POLARITY_HIGH);
477 	case ACPI_MADT_POLARITY_ACTIVE_LOW:
478 		return (INTR_POLARITY_LOW);
479 	}
480 }
481 
482 static enum intr_trigger
483 interrupt_trigger(UINT16 IntiFlags, UINT8 Source)
484 {
485 
486 	switch (IntiFlags & ACPI_MADT_TRIGGER_MASK) {
487 	default:
488 		printf("WARNING: Bogus Interrupt Trigger Mode. Assume CONFORMS.\n");
489 		/*FALLTHROUGH*/
490 	case ACPI_MADT_TRIGGER_CONFORMS:
491 		if (Source == AcpiGbl_FADT.SciInterrupt)
492 			return (INTR_TRIGGER_LEVEL);
493 		else
494 			return (INTR_TRIGGER_EDGE);
495 	case ACPI_MADT_TRIGGER_EDGE:
496 		return (INTR_TRIGGER_EDGE);
497 	case ACPI_MADT_TRIGGER_LEVEL:
498 		return (INTR_TRIGGER_LEVEL);
499 	}
500 }
501 
502 /*
503  * Find the local APIC ID associated with a given ACPI Processor ID.
504  */
505 static int
506 madt_find_cpu(u_int acpi_id, u_int *apic_id)
507 {
508 	int i;
509 
510 	for (i = 0; i <= max_apic_id; i++) {
511 		if (!lapics[i].la_enabled)
512 			continue;
513 		if (lapics[i].la_acpi_id != acpi_id)
514 			continue;
515 		*apic_id = i;
516 		return (0);
517 	}
518 	return (ENOENT);
519 }
520 
521 /*
522  * Find the IO APIC and pin on that APIC associated with a given global
523  * interrupt.
524  */
525 static int
526 madt_find_interrupt(int intr, void **apic, u_int *pin)
527 {
528 	int i, best;
529 
530 	best = -1;
531 	for (i = 0; i <= IOAPIC_MAX_ID; i++) {
532 		if (ioapics[i].io_apic == NULL ||
533 		    ioapics[i].io_vector > intr)
534 			continue;
535 		if (best == -1 ||
536 		    ioapics[best].io_vector < ioapics[i].io_vector)
537 			best = i;
538 	}
539 	if (best == -1)
540 		return (ENOENT);
541 	*apic = ioapics[best].io_apic;
542 	*pin = intr - ioapics[best].io_vector;
543 	if (*pin > 32)
544 		printf("WARNING: Found intpin of %u for vector %d\n", *pin,
545 		    intr);
546 	return (0);
547 }
548 
549 void
550 madt_parse_interrupt_values(void *entry,
551     enum intr_trigger *trig, enum intr_polarity *pol)
552 {
553 	ACPI_MADT_INTERRUPT_OVERRIDE *intr;
554 	char buf[64];
555 
556 	intr = entry;
557 
558 	if (bootverbose)
559 		printf("MADT: Interrupt override: source %u, irq %u\n",
560 		    intr->SourceIrq, intr->GlobalIrq);
561 	KASSERT(intr->Bus == 0, ("bus for interrupt overrides must be zero"));
562 
563 	/*
564 	 * Lookup the appropriate trigger and polarity modes for this
565 	 * entry.
566 	 */
567 	*trig = interrupt_trigger(intr->IntiFlags, intr->SourceIrq);
568 	*pol = interrupt_polarity(intr->IntiFlags, intr->SourceIrq);
569 
570 	/*
571 	 * If the SCI is identity mapped but has edge trigger and
572 	 * active-hi polarity or the force_sci_lo tunable is set,
573 	 * force it to use level/lo.
574 	 */
575 	if (intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) {
576 		madt_found_sci_override = 1;
577 		if (getenv_string("hw.acpi.sci.trigger", buf, sizeof(buf))) {
578 			if (tolower(buf[0]) == 'e')
579 				*trig = INTR_TRIGGER_EDGE;
580 			else if (tolower(buf[0]) == 'l')
581 				*trig = INTR_TRIGGER_LEVEL;
582 			else
583 				panic(
584 				"Invalid trigger %s: must be 'edge' or 'level'",
585 				    buf);
586 			printf("MADT: Forcing SCI to %s trigger\n",
587 			    *trig == INTR_TRIGGER_EDGE ? "edge" : "level");
588 		}
589 		if (getenv_string("hw.acpi.sci.polarity", buf, sizeof(buf))) {
590 			if (tolower(buf[0]) == 'h')
591 				*pol = INTR_POLARITY_HIGH;
592 			else if (tolower(buf[0]) == 'l')
593 				*pol = INTR_POLARITY_LOW;
594 			else
595 				panic(
596 				"Invalid polarity %s: must be 'high' or 'low'",
597 				    buf);
598 			printf("MADT: Forcing SCI to active %s polarity\n",
599 			    *pol == INTR_POLARITY_HIGH ? "high" : "low");
600 		}
601 	}
602 }
603 
604 /*
605  * Parse an interrupt source override for an ISA interrupt.
606  */
607 static void
608 madt_parse_interrupt_override(ACPI_MADT_INTERRUPT_OVERRIDE *intr)
609 {
610 	void *new_ioapic, *old_ioapic;
611 	u_int new_pin, old_pin;
612 	enum intr_trigger trig;
613 	enum intr_polarity pol;
614 
615 	if (acpi_quirks & ACPI_Q_MADT_IRQ0 && intr->SourceIrq == 0 &&
616 	    intr->GlobalIrq == 2) {
617 		if (bootverbose)
618 			printf("MADT: Skipping timer override\n");
619 		return;
620 	}
621 
622 	if (madt_find_interrupt(intr->GlobalIrq, &new_ioapic, &new_pin) != 0) {
623 		printf("MADT: Could not find APIC for vector %u (IRQ %u)\n",
624 		    intr->GlobalIrq, intr->SourceIrq);
625 		return;
626 	}
627 
628 	madt_parse_interrupt_values(intr, &trig, &pol);
629 
630 	/* Remap the IRQ if it is mapped to a different interrupt vector. */
631 	if (intr->SourceIrq != intr->GlobalIrq) {
632 		/*
633 		 * If the SCI is remapped to a non-ISA global interrupt,
634 		 * then override the vector we use to setup and allocate
635 		 * the interrupt.
636 		 */
637 		if (intr->GlobalIrq > 15 &&
638 		    intr->SourceIrq == AcpiGbl_FADT.SciInterrupt)
639 			acpi_OverrideInterruptLevel(intr->GlobalIrq);
640 		else
641 			ioapic_remap_vector(new_ioapic, new_pin,
642 			    intr->SourceIrq);
643 		if (madt_find_interrupt(intr->SourceIrq, &old_ioapic,
644 		    &old_pin) != 0)
645 			printf("MADT: Could not find APIC for source IRQ %u\n",
646 			    intr->SourceIrq);
647 		else if (ioapic_get_vector(old_ioapic, old_pin) ==
648 		    intr->SourceIrq)
649 			ioapic_disable_pin(old_ioapic, old_pin);
650 	}
651 
652 	/* Program the polarity and trigger mode. */
653 	ioapic_set_triggermode(new_ioapic, new_pin, trig);
654 	ioapic_set_polarity(new_ioapic, new_pin, pol);
655 }
656 
657 /*
658  * Parse an entry for an NMI routed to an IO APIC.
659  */
660 static void
661 madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi)
662 {
663 	void *ioapic;
664 	u_int pin;
665 
666 	if (madt_find_interrupt(nmi->GlobalIrq, &ioapic, &pin) != 0) {
667 		printf("MADT: Could not find APIC for vector %u\n",
668 		    nmi->GlobalIrq);
669 		return;
670 	}
671 
672 	ioapic_set_nmi(ioapic, pin);
673 	if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS))
674 		ioapic_set_triggermode(ioapic, pin,
675 		    interrupt_trigger(nmi->IntiFlags, 0));
676 	if (!(nmi->IntiFlags & ACPI_MADT_POLARITY_CONFORMS))
677 		ioapic_set_polarity(ioapic, pin,
678 		    interrupt_polarity(nmi->IntiFlags, 0));
679 }
680 
681 /*
682  * Parse an entry for an NMI routed to a local APIC LVT pin.
683  */
684 static void
685 madt_handle_local_nmi(u_int acpi_id, UINT8 Lint, UINT16 IntiFlags)
686 {
687 	u_int apic_id, pin;
688 
689 	if (acpi_id == 0xffffffff)
690 		apic_id = APIC_ID_ALL;
691 	else if (madt_find_cpu(acpi_id, &apic_id) != 0) {
692 		if (bootverbose)
693 			printf("MADT: Ignoring local NMI routed to "
694 			    "ACPI CPU %u\n", acpi_id);
695 		return;
696 	}
697 	if (Lint == 0)
698 		pin = APIC_LVT_LINT0;
699 	else
700 		pin = APIC_LVT_LINT1;
701 	lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_NMI);
702 	if (!(IntiFlags & ACPI_MADT_TRIGGER_CONFORMS))
703 		lapic_set_lvt_triggermode(apic_id, pin,
704 		    interrupt_trigger(IntiFlags, 0));
705 	if (!(IntiFlags & ACPI_MADT_POLARITY_CONFORMS))
706 		lapic_set_lvt_polarity(apic_id, pin,
707 		    interrupt_polarity(IntiFlags, 0));
708 }
709 
710 static void
711 madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi)
712 {
713 
714 	madt_handle_local_nmi(nmi->ProcessorId == 0xff ? 0xffffffff :
715 	    nmi->ProcessorId, nmi->Lint, nmi->IntiFlags);
716 }
717 
718 static void
719 madt_parse_local_x2apic_nmi(ACPI_MADT_LOCAL_X2APIC_NMI *nmi)
720 {
721 
722 	madt_handle_local_nmi(nmi->Uid, nmi->Lint, nmi->IntiFlags);
723 }
724 
725 /*
726  * Parse interrupt entries.
727  */
728 static void
729 madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, void *arg __unused)
730 {
731 
732 	switch (entry->Type) {
733 	case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
734 		madt_parse_interrupt_override(
735 			(ACPI_MADT_INTERRUPT_OVERRIDE *)entry);
736 		break;
737 	case ACPI_MADT_TYPE_NMI_SOURCE:
738 		madt_parse_nmi((ACPI_MADT_NMI_SOURCE *)entry);
739 		break;
740 	case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
741 		madt_parse_local_nmi((ACPI_MADT_LOCAL_APIC_NMI *)entry);
742 		break;
743 	case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
744 		madt_parse_local_x2apic_nmi(
745 		    (ACPI_MADT_LOCAL_X2APIC_NMI *)entry);
746 		break;
747 	}
748 }
749 
750 /*
751  * Setup per-CPU ACPI IDs.
752  */
753 static void
754 madt_set_ids(void *dummy)
755 {
756 	struct lapic_info *la;
757 	struct pcpu *pc;
758 	u_int i;
759 
760 	if (madt == NULL)
761 		return;
762 
763 	KASSERT(lapics != NULL, ("local APICs not initialized"));
764 
765 	CPU_FOREACH(i) {
766 		pc = pcpu_find(i);
767 		KASSERT(pc != NULL, ("no pcpu data for CPU %u", i));
768 		la = &lapics[pc->pc_apic_id];
769 		if (!la->la_enabled)
770 			panic("APIC: CPU with APIC ID %u is not enabled",
771 			    pc->pc_apic_id);
772 		pc->pc_acpi_id = la->la_acpi_id;
773 		if (bootverbose)
774 			printf("APIC: CPU %u has ACPI ID %u\n", i,
775 			    la->la_acpi_id);
776 	}
777 }
778 SYSINIT(madt_set_ids, SI_SUB_CPU, SI_ORDER_MIDDLE, madt_set_ids, NULL);
779