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1/*
2 * boot.c - Architecture-Specific Low-Level ACPI Boot Support
3 *
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 * Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26#include <linux/init.h>
27#include <linux/acpi.h>
28#include <linux/acpi_pmtmr.h>
29#include <linux/efi.h>
30#include <linux/cpumask.h>
31#include <linux/export.h>
32#include <linux/dmi.h>
33#include <linux/irq.h>
34#include <linux/slab.h>
35#include <linux/bootmem.h>
36#include <linux/ioport.h>
37#include <linux/pci.h>
38#include <linux/efi-bgrt.h>
39#include <linux/serial_core.h>
40
41#include <asm/e820/api.h>
42#include <asm/irqdomain.h>
43#include <asm/pci_x86.h>
44#include <asm/pgtable.h>
45#include <asm/io_apic.h>
46#include <asm/apic.h>
47#include <asm/io.h>
48#include <asm/mpspec.h>
49#include <asm/smp.h>
50#include <asm/i8259.h>
51
52#include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
53static int __initdata acpi_force = 0;
54int acpi_disabled;
55EXPORT_SYMBOL(acpi_disabled);
56
57#ifdef CONFIG_X86_64
58# include <asm/proto.h>
59#endif /* X86 */
60
61#define PREFIX "ACPI: "
62
63int acpi_noirq; /* skip ACPI IRQ initialization */
64int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
65EXPORT_SYMBOL(acpi_pci_disabled);
66
67int acpi_lapic;
68int acpi_ioapic;
69int acpi_strict;
70int acpi_disable_cmcff;
71
72/* ACPI SCI override configuration */
73u8 acpi_sci_flags __initdata;
74u32 acpi_sci_override_gsi __initdata = INVALID_ACPI_IRQ;
75int acpi_skip_timer_override __initdata;
76int acpi_use_timer_override __initdata;
77int acpi_fix_pin2_polarity __initdata;
78
79#ifdef CONFIG_X86_LOCAL_APIC
80static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
81#endif
82
83#ifdef CONFIG_X86_IO_APIC
84/*
85 * Locks related to IOAPIC hotplug
86 * Hotplug side:
87 * ->device_hotplug_lock
88 * ->acpi_ioapic_lock
89 * ->ioapic_lock
90 * Interrupt mapping side:
91 * ->acpi_ioapic_lock
92 * ->ioapic_mutex
93 * ->ioapic_lock
94 */
95static DEFINE_MUTEX(acpi_ioapic_lock);
96#endif
97
98/* --------------------------------------------------------------------------
99 Boot-time Configuration
100 -------------------------------------------------------------------------- */
101
102/*
103 * The default interrupt routing model is PIC (8259). This gets
104 * overridden if IOAPICs are enumerated (below).
105 */
106enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
107
108
109/*
110 * ISA irqs by default are the first 16 gsis but can be
111 * any gsi as specified by an interrupt source override.
112 */
113static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
114 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
115};
116
117/*
118 * This is just a simple wrapper around early_memremap(),
119 * with sanity checks for phys == 0 and size == 0.
120 */
121void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
122{
123
124 if (!phys || !size)
125 return NULL;
126
127 return early_memremap(phys, size);
128}
129
130void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
131{
132 if (!map || !size)
133 return;
134
135 early_memunmap(map, size);
136}
137
138#ifdef CONFIG_X86_LOCAL_APIC
139static int __init acpi_parse_madt(struct acpi_table_header *table)
140{
141 struct acpi_table_madt *madt = NULL;
142
143 if (!boot_cpu_has(X86_FEATURE_APIC))
144 return -EINVAL;
145
146 madt = (struct acpi_table_madt *)table;
147 if (!madt) {
148 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
149 return -ENODEV;
150 }
151
152 if (madt->address) {
153 acpi_lapic_addr = (u64) madt->address;
154
155 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
156 madt->address);
157 }
158
159 default_acpi_madt_oem_check(madt->header.oem_id,
160 madt->header.oem_table_id);
161
162 return 0;
163}
164
165/**
166 * acpi_register_lapic - register a local apic and generates a logic cpu number
167 * @id: local apic id to register
168 * @acpiid: ACPI id to register
169 * @enabled: this cpu is enabled or not
170 *
171 * Returns the logic cpu number which maps to the local apic
172 */
173static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
174{
175 unsigned int ver = 0;
176 int cpu;
177
178 if (id >= MAX_LOCAL_APIC) {
179 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
180 return -EINVAL;
181 }
182
183 if (!enabled) {
184 ++disabled_cpus;
185 return -EINVAL;
186 }
187
188 if (boot_cpu_physical_apicid != -1U)
189 ver = boot_cpu_apic_version;
190
191 cpu = generic_processor_info(id, ver);
192 if (cpu >= 0)
193 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
194
195 return cpu;
196}
197
198static int __init
199acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
200{
201 struct acpi_madt_local_x2apic *processor = NULL;
202#ifdef CONFIG_X86_X2APIC
203 u32 apic_id;
204 u8 enabled;
205#endif
206
207 processor = (struct acpi_madt_local_x2apic *)header;
208
209 if (BAD_MADT_ENTRY(processor, end))
210 return -EINVAL;
211
212 acpi_table_print_madt_entry(header);
213
214#ifdef CONFIG_X86_X2APIC
215 apic_id = processor->local_apic_id;
216 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
217
218 /* Ignore invalid ID */
219 if (apic_id == 0xffffffff)
220 return 0;
221
222 /*
223 * We need to register disabled CPU as well to permit
224 * counting disabled CPUs. This allows us to size
225 * cpus_possible_map more accurately, to permit
226 * to not preallocating memory for all NR_CPUS
227 * when we use CPU hotplug.
228 */
229 if (!apic->apic_id_valid(apic_id)) {
230 if (enabled)
231 pr_warn(PREFIX "x2apic entry ignored\n");
232 return 0;
233 }
234
235 acpi_register_lapic(apic_id, processor->uid, enabled);
236#else
237 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
238#endif
239
240 return 0;
241}
242
243static int __init
244acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
245{
246 struct acpi_madt_local_apic *processor = NULL;
247
248 processor = (struct acpi_madt_local_apic *)header;
249
250 if (BAD_MADT_ENTRY(processor, end))
251 return -EINVAL;
252
253 acpi_table_print_madt_entry(header);
254
255 /* Ignore invalid ID */
256 if (processor->id == 0xff)
257 return 0;
258
259 /*
260 * We need to register disabled CPU as well to permit
261 * counting disabled CPUs. This allows us to size
262 * cpus_possible_map more accurately, to permit
263 * to not preallocating memory for all NR_CPUS
264 * when we use CPU hotplug.
265 */
266 acpi_register_lapic(processor->id, /* APIC ID */
267 processor->processor_id, /* ACPI ID */
268 processor->lapic_flags & ACPI_MADT_ENABLED);
269
270 return 0;
271}
272
273static int __init
274acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
275{
276 struct acpi_madt_local_sapic *processor = NULL;
277
278 processor = (struct acpi_madt_local_sapic *)header;
279
280 if (BAD_MADT_ENTRY(processor, end))
281 return -EINVAL;
282
283 acpi_table_print_madt_entry(header);
284
285 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
286 processor->processor_id, /* ACPI ID */
287 processor->lapic_flags & ACPI_MADT_ENABLED);
288
289 return 0;
290}
291
292static int __init
293acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
294 const unsigned long end)
295{
296 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
297
298 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
299
300 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
301 return -EINVAL;
302
303 acpi_table_print_madt_entry(header);
304
305 acpi_lapic_addr = lapic_addr_ovr->address;
306
307 return 0;
308}
309
310static int __init
311acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
312 const unsigned long end)
313{
314 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
315
316 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
317
318 if (BAD_MADT_ENTRY(x2apic_nmi, end))
319 return -EINVAL;
320
321 acpi_table_print_madt_entry(header);
322
323 if (x2apic_nmi->lint != 1)
324 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
325
326 return 0;
327}
328
329static int __init
330acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
331{
332 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
333
334 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
335
336 if (BAD_MADT_ENTRY(lapic_nmi, end))
337 return -EINVAL;
338
339 acpi_table_print_madt_entry(header);
340
341 if (lapic_nmi->lint != 1)
342 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
343
344 return 0;
345}
346
347#endif /*CONFIG_X86_LOCAL_APIC */
348
349#ifdef CONFIG_X86_IO_APIC
350#define MP_ISA_BUS 0
351
352static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
353 u8 trigger, u32 gsi);
354
355static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
356 u32 gsi)
357{
358 /*
359 * Check bus_irq boundary.
360 */
361 if (bus_irq >= NR_IRQS_LEGACY) {
362 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
363 return;
364 }
365
366 /*
367 * TBD: This check is for faulty timer entries, where the override
368 * erroneously sets the trigger to level, resulting in a HUGE
369 * increase of timer interrupts!
370 */
371 if ((bus_irq == 0) && (trigger == 3))
372 trigger = 1;
373
374 if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
375 return;
376 /*
377 * Reset default identity mapping if gsi is also an legacy IRQ,
378 * otherwise there will be more than one entry with the same GSI
379 * and acpi_isa_irq_to_gsi() may give wrong result.
380 */
381 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
382 isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
383 isa_irq_to_gsi[bus_irq] = gsi;
384}
385
386static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
387 int polarity)
388{
389#ifdef CONFIG_X86_MPPARSE
390 struct mpc_intsrc mp_irq;
391 struct pci_dev *pdev;
392 unsigned char number;
393 unsigned int devfn;
394 int ioapic;
395 u8 pin;
396
397 if (!acpi_ioapic)
398 return 0;
399 if (!dev || !dev_is_pci(dev))
400 return 0;
401
402 pdev = to_pci_dev(dev);
403 number = pdev->bus->number;
404 devfn = pdev->devfn;
405 pin = pdev->pin;
406 /* print the entry should happen on mptable identically */
407 mp_irq.type = MP_INTSRC;
408 mp_irq.irqtype = mp_INT;
409 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
410 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
411 mp_irq.srcbus = number;
412 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
413 ioapic = mp_find_ioapic(gsi);
414 mp_irq.dstapic = mpc_ioapic_id(ioapic);
415 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
416
417 mp_save_irq(&mp_irq);
418#endif
419 return 0;
420}
421
422static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
423 u8 trigger, u32 gsi)
424{
425 struct mpc_intsrc mp_irq;
426 int ioapic, pin;
427
428 /* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
429 ioapic = mp_find_ioapic(gsi);
430 if (ioapic < 0) {
431 pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
432 return ioapic;
433 }
434
435 pin = mp_find_ioapic_pin(ioapic, gsi);
436
437 mp_irq.type = MP_INTSRC;
438 mp_irq.irqtype = mp_INT;
439 mp_irq.irqflag = (trigger << 2) | polarity;
440 mp_irq.srcbus = MP_ISA_BUS;
441 mp_irq.srcbusirq = bus_irq;
442 mp_irq.dstapic = mpc_ioapic_id(ioapic);
443 mp_irq.dstirq = pin;
444
445 mp_save_irq(&mp_irq);
446
447 return 0;
448}
449
450static int __init
451acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
452{
453 struct acpi_madt_io_apic *ioapic = NULL;
454 struct ioapic_domain_cfg cfg = {
455 .type = IOAPIC_DOMAIN_DYNAMIC,
456 .ops = &mp_ioapic_irqdomain_ops,
457 };
458
459 ioapic = (struct acpi_madt_io_apic *)header;
460
461 if (BAD_MADT_ENTRY(ioapic, end))
462 return -EINVAL;
463
464 acpi_table_print_madt_entry(header);
465
466 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
467 if (ioapic->global_irq_base < nr_legacy_irqs())
468 cfg.type = IOAPIC_DOMAIN_LEGACY;
469
470 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
471 &cfg);
472
473 return 0;
474}
475
476/*
477 * Parse Interrupt Source Override for the ACPI SCI
478 */
479static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
480{
481 if (trigger == 0) /* compatible SCI trigger is level */
482 trigger = 3;
483
484 if (polarity == 0) /* compatible SCI polarity is low */
485 polarity = 3;
486
487 /* Command-line over-ride via acpi_sci= */
488 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
489 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
490
491 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
492 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
493
494 if (bus_irq < NR_IRQS_LEGACY)
495 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
496 else
497 mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
498
499 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
500
501 /*
502 * stash over-ride to indicate we've been here
503 * and for later update of acpi_gbl_FADT
504 */
505 acpi_sci_override_gsi = gsi;
506 return;
507}
508
509static int __init
510acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
511 const unsigned long end)
512{
513 struct acpi_madt_interrupt_override *intsrc = NULL;
514
515 intsrc = (struct acpi_madt_interrupt_override *)header;
516
517 if (BAD_MADT_ENTRY(intsrc, end))
518 return -EINVAL;
519
520 acpi_table_print_madt_entry(header);
521
522 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
523 acpi_sci_ioapic_setup(intsrc->source_irq,
524 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
525 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
526 intsrc->global_irq);
527 return 0;
528 }
529
530 if (intsrc->source_irq == 0) {
531 if (acpi_skip_timer_override) {
532 printk(PREFIX "BIOS IRQ0 override ignored.\n");
533 return 0;
534 }
535
536 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
537 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
538 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
539 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
540 }
541 }
542
543 mp_override_legacy_irq(intsrc->source_irq,
544 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
545 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
546 intsrc->global_irq);
547
548 return 0;
549}
550
551static int __init
552acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
553{
554 struct acpi_madt_nmi_source *nmi_src = NULL;
555
556 nmi_src = (struct acpi_madt_nmi_source *)header;
557
558 if (BAD_MADT_ENTRY(nmi_src, end))
559 return -EINVAL;
560
561 acpi_table_print_madt_entry(header);
562
563 /* TBD: Support nimsrc entries? */
564
565 return 0;
566}
567
568#endif /* CONFIG_X86_IO_APIC */
569
570/*
571 * acpi_pic_sci_set_trigger()
572 *
573 * use ELCR to set PIC-mode trigger type for SCI
574 *
575 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
576 * it may require Edge Trigger -- use "acpi_sci=edge"
577 *
578 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
579 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
580 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
581 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
582 */
583
584void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
585{
586 unsigned int mask = 1 << irq;
587 unsigned int old, new;
588
589 /* Real old ELCR mask */
590 old = inb(0x4d0) | (inb(0x4d1) << 8);
591
592 /*
593 * If we use ACPI to set PCI IRQs, then we should clear ELCR
594 * since we will set it correctly as we enable the PCI irq
595 * routing.
596 */
597 new = acpi_noirq ? old : 0;
598
599 /*
600 * Update SCI information in the ELCR, it isn't in the PCI
601 * routing tables..
602 */
603 switch (trigger) {
604 case 1: /* Edge - clear */
605 new &= ~mask;
606 break;
607 case 3: /* Level - set */
608 new |= mask;
609 break;
610 }
611
612 if (old == new)
613 return;
614
615 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
616 outb(new, 0x4d0);
617 outb(new >> 8, 0x4d1);
618}
619
620int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
621{
622 int rc, irq, trigger, polarity;
623
624 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
625 *irqp = gsi;
626 return 0;
627 }
628
629 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
630 if (rc)
631 return rc;
632
633 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
634 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
635 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
636 if (irq < 0)
637 return irq;
638
639 *irqp = irq;
640 return 0;
641}
642EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
643
644int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
645{
646 if (isa_irq < nr_legacy_irqs() &&
647 isa_irq_to_gsi[isa_irq] != INVALID_ACPI_IRQ) {
648 *gsi = isa_irq_to_gsi[isa_irq];
649 return 0;
650 }
651
652 return -1;
653}
654
655static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
656 int trigger, int polarity)
657{
658#ifdef CONFIG_PCI
659 /*
660 * Make sure all (legacy) PCI IRQs are set as level-triggered.
661 */
662 if (trigger == ACPI_LEVEL_SENSITIVE)
663 elcr_set_level_irq(gsi);
664#endif
665
666 return gsi;
667}
668
669#ifdef CONFIG_X86_LOCAL_APIC
670static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
671 int trigger, int polarity)
672{
673 int irq = gsi;
674#ifdef CONFIG_X86_IO_APIC
675 int node;
676 struct irq_alloc_info info;
677
678 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
679 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
680 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
681 ioapic_set_alloc_attr(&info, node, trigger, polarity);
682
683 mutex_lock(&acpi_ioapic_lock);
684 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
685 /* Don't set up the ACPI SCI because it's already set up */
686 if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
687 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
688 mutex_unlock(&acpi_ioapic_lock);
689#endif
690
691 return irq;
692}
693
694static void acpi_unregister_gsi_ioapic(u32 gsi)
695{
696#ifdef CONFIG_X86_IO_APIC
697 int irq;
698
699 mutex_lock(&acpi_ioapic_lock);
700 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
701 if (irq > 0)
702 mp_unmap_irq(irq);
703 mutex_unlock(&acpi_ioapic_lock);
704#endif
705}
706#endif
707
708int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
709 int trigger, int polarity) = acpi_register_gsi_pic;
710void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
711
712#ifdef CONFIG_ACPI_SLEEP
713int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
714#else
715int (*acpi_suspend_lowlevel)(void);
716#endif
717
718/*
719 * success: return IRQ number (>=0)
720 * failure: return < 0
721 */
722int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
723{
724 return __acpi_register_gsi(dev, gsi, trigger, polarity);
725}
726EXPORT_SYMBOL_GPL(acpi_register_gsi);
727
728void acpi_unregister_gsi(u32 gsi)
729{
730 if (__acpi_unregister_gsi)
731 __acpi_unregister_gsi(gsi);
732}
733EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
734
735#ifdef CONFIG_X86_LOCAL_APIC
736static void __init acpi_set_irq_model_ioapic(void)
737{
738 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
739 __acpi_register_gsi = acpi_register_gsi_ioapic;
740 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
741 acpi_ioapic = 1;
742}
743#endif
744
745/*
746 * ACPI based hotplug support for CPU
747 */
748#ifdef CONFIG_ACPI_HOTPLUG_CPU
749#include <acpi/processor.h>
750
751static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
752{
753#ifdef CONFIG_ACPI_NUMA
754 int nid;
755
756 nid = acpi_get_node(handle);
757 if (nid != NUMA_NO_NODE) {
758 set_apicid_to_node(physid, nid);
759 numa_set_node(cpu, nid);
760 }
761#endif
762 return 0;
763}
764
765int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
766 int *pcpu)
767{
768 int cpu;
769
770 cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
771 if (cpu < 0) {
772 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
773 return cpu;
774 }
775
776 acpi_processor_set_pdc(handle);
777 acpi_map_cpu2node(handle, cpu, physid);
778
779 *pcpu = cpu;
780 return 0;
781}
782EXPORT_SYMBOL(acpi_map_cpu);
783
784int acpi_unmap_cpu(int cpu)
785{
786#ifdef CONFIG_ACPI_NUMA
787 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
788#endif
789
790 per_cpu(x86_cpu_to_apicid, cpu) = -1;
791 set_cpu_present(cpu, false);
792 num_processors--;
793
794 return (0);
795}
796EXPORT_SYMBOL(acpi_unmap_cpu);
797#endif /* CONFIG_ACPI_HOTPLUG_CPU */
798
799int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
800{
801 int ret = -ENOSYS;
802#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
803 int ioapic_id;
804 u64 addr;
805 struct ioapic_domain_cfg cfg = {
806 .type = IOAPIC_DOMAIN_DYNAMIC,
807 .ops = &mp_ioapic_irqdomain_ops,
808 };
809
810 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
811 if (ioapic_id < 0) {
812 unsigned long long uid;
813 acpi_status status;
814
815 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
816 NULL, &uid);
817 if (ACPI_FAILURE(status)) {
818 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
819 return -EINVAL;
820 }
821 ioapic_id = (int)uid;
822 }
823
824 mutex_lock(&acpi_ioapic_lock);
825 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
826 mutex_unlock(&acpi_ioapic_lock);
827#endif
828
829 return ret;
830}
831EXPORT_SYMBOL(acpi_register_ioapic);
832
833int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
834{
835 int ret = -ENOSYS;
836
837#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
838 mutex_lock(&acpi_ioapic_lock);
839 ret = mp_unregister_ioapic(gsi_base);
840 mutex_unlock(&acpi_ioapic_lock);
841#endif
842
843 return ret;
844}
845EXPORT_SYMBOL(acpi_unregister_ioapic);
846
847/**
848 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
849 * has been registered
850 * @handle: ACPI handle of the IOAPIC deivce
851 * @gsi_base: GSI base associated with the IOAPIC
852 *
853 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
854 * with acpi_register_ioapic()/acpi_unregister_ioapic().
855 */
856int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
857{
858 int ret = 0;
859
860#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
861 mutex_lock(&acpi_ioapic_lock);
862 ret = mp_ioapic_registered(gsi_base);
863 mutex_unlock(&acpi_ioapic_lock);
864#endif
865
866 return ret;
867}
868
869static int __init acpi_parse_sbf(struct acpi_table_header *table)
870{
871 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
872
873 sbf_port = sb->cmos_index; /* Save CMOS port */
874
875 return 0;
876}
877
878#ifdef CONFIG_HPET_TIMER
879#include <asm/hpet.h>
880
881static struct resource *hpet_res __initdata;
882
883static int __init acpi_parse_hpet(struct acpi_table_header *table)
884{
885 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
886
887 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
888 printk(KERN_WARNING PREFIX "HPET timers must be located in "
889 "memory.\n");
890 return -1;
891 }
892
893 hpet_address = hpet_tbl->address.address;
894 hpet_blockid = hpet_tbl->sequence;
895
896 /*
897 * Some broken BIOSes advertise HPET at 0x0. We really do not
898 * want to allocate a resource there.
899 */
900 if (!hpet_address) {
901 printk(KERN_WARNING PREFIX
902 "HPET id: %#x base: %#lx is invalid\n",
903 hpet_tbl->id, hpet_address);
904 return 0;
905 }
906#ifdef CONFIG_X86_64
907 /*
908 * Some even more broken BIOSes advertise HPET at
909 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
910 * some noise:
911 */
912 if (hpet_address == 0xfed0000000000000UL) {
913 if (!hpet_force_user) {
914 printk(KERN_WARNING PREFIX "HPET id: %#x "
915 "base: 0xfed0000000000000 is bogus\n "
916 "try hpet=force on the kernel command line to "
917 "fix it up to 0xfed00000.\n", hpet_tbl->id);
918 hpet_address = 0;
919 return 0;
920 }
921 printk(KERN_WARNING PREFIX
922 "HPET id: %#x base: 0xfed0000000000000 fixed up "
923 "to 0xfed00000.\n", hpet_tbl->id);
924 hpet_address >>= 32;
925 }
926#endif
927 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
928 hpet_tbl->id, hpet_address);
929
930 /*
931 * Allocate and initialize the HPET firmware resource for adding into
932 * the resource tree during the lateinit timeframe.
933 */
934#define HPET_RESOURCE_NAME_SIZE 9
935 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
936
937 hpet_res->name = (void *)&hpet_res[1];
938 hpet_res->flags = IORESOURCE_MEM;
939 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
940 hpet_tbl->sequence);
941
942 hpet_res->start = hpet_address;
943 hpet_res->end = hpet_address + (1 * 1024) - 1;
944
945 return 0;
946}
947
948/*
949 * hpet_insert_resource inserts the HPET resources used into the resource
950 * tree.
951 */
952static __init int hpet_insert_resource(void)
953{
954 if (!hpet_res)
955 return 1;
956
957 return insert_resource(&iomem_resource, hpet_res);
958}
959
960late_initcall(hpet_insert_resource);
961
962#else
963#define acpi_parse_hpet NULL
964#endif
965
966static int __init acpi_parse_fadt(struct acpi_table_header *table)
967{
968 if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
969 pr_debug("ACPI: no legacy devices present\n");
970 x86_platform.legacy.devices.pnpbios = 0;
971 }
972
973 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
974 !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
975 x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
976 pr_debug("ACPI: i8042 controller is absent\n");
977 x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
978 }
979
980 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
981 pr_debug("ACPI: not registering RTC platform device\n");
982 x86_platform.legacy.rtc = 0;
983 }
984
985 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
986 pr_debug("ACPI: probing for VGA not safe\n");
987 x86_platform.legacy.no_vga = 1;
988 }
989
990#ifdef CONFIG_X86_PM_TIMER
991 /* detect the location of the ACPI PM Timer */
992 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
993 /* FADT rev. 2 */
994 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
995 ACPI_ADR_SPACE_SYSTEM_IO)
996 return 0;
997
998 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
999 /*
1000 * "X" fields are optional extensions to the original V1.0
1001 * fields, so we must selectively expand V1.0 fields if the
1002 * corresponding X field is zero.
1003 */
1004 if (!pmtmr_ioport)
1005 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1006 } else {
1007 /* FADT rev. 1 */
1008 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
1009 }
1010 if (pmtmr_ioport)
1011 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
1012 pmtmr_ioport);
1013#endif
1014 return 0;
1015}
1016
1017#ifdef CONFIG_X86_LOCAL_APIC
1018/*
1019 * Parse LAPIC entries in MADT
1020 * returns 0 on success, < 0 on error
1021 */
1022
1023static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
1024{
1025 int count;
1026
1027 if (!boot_cpu_has(X86_FEATURE_APIC))
1028 return -ENODEV;
1029
1030 /*
1031 * Note that the LAPIC address is obtained from the MADT (32-bit value)
1032 * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1033 */
1034
1035 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1036 acpi_parse_lapic_addr_ovr, 0);
1037 if (count < 0) {
1038 printk(KERN_ERR PREFIX
1039 "Error parsing LAPIC address override entry\n");
1040 return count;
1041 }
1042
1043 register_lapic_address(acpi_lapic_addr);
1044
1045 return count;
1046}
1047
1048static int __init acpi_parse_madt_lapic_entries(void)
1049{
1050 int count;
1051 int x2count = 0;
1052 int ret;
1053 struct acpi_subtable_proc madt_proc[2];
1054
1055 if (!boot_cpu_has(X86_FEATURE_APIC))
1056 return -ENODEV;
1057
1058 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1059 acpi_parse_sapic, MAX_LOCAL_APIC);
1060
1061 if (!count) {
1062 memset(madt_proc, 0, sizeof(madt_proc));
1063 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1064 madt_proc[0].handler = acpi_parse_lapic;
1065 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1066 madt_proc[1].handler = acpi_parse_x2apic;
1067 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1068 sizeof(struct acpi_table_madt),
1069 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1070 if (ret < 0) {
1071 printk(KERN_ERR PREFIX
1072 "Error parsing LAPIC/X2APIC entries\n");
1073 return ret;
1074 }
1075
1076 count = madt_proc[0].count;
1077 x2count = madt_proc[1].count;
1078 }
1079 if (!count && !x2count) {
1080 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1081 /* TBD: Cleanup to allow fallback to MPS */
1082 return -ENODEV;
1083 } else if (count < 0 || x2count < 0) {
1084 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1085 /* TBD: Cleanup to allow fallback to MPS */
1086 return count;
1087 }
1088
1089 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1090 acpi_parse_x2apic_nmi, 0);
1091 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1092 acpi_parse_lapic_nmi, 0);
1093 if (count < 0 || x2count < 0) {
1094 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1095 /* TBD: Cleanup to allow fallback to MPS */
1096 return count;
1097 }
1098 return 0;
1099}
1100#endif /* CONFIG_X86_LOCAL_APIC */
1101
1102#ifdef CONFIG_X86_IO_APIC
1103static void __init mp_config_acpi_legacy_irqs(void)
1104{
1105 int i;
1106 struct mpc_intsrc mp_irq;
1107
1108#ifdef CONFIG_EISA
1109 /*
1110 * Fabricate the legacy ISA bus (bus #31).
1111 */
1112 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1113#endif
1114 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1115 pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());
1116
1117 /*
1118 * Use the default configuration for the IRQs 0-15. Unless
1119 * overridden by (MADT) interrupt source override entries.
1120 */
1121 for (i = 0; i < nr_legacy_irqs(); i++) {
1122 int ioapic, pin;
1123 unsigned int dstapic;
1124 int idx;
1125 u32 gsi;
1126
1127 /* Locate the gsi that irq i maps to. */
1128 if (acpi_isa_irq_to_gsi(i, &gsi))
1129 continue;
1130
1131 /*
1132 * Locate the IOAPIC that manages the ISA IRQ.
1133 */
1134 ioapic = mp_find_ioapic(gsi);
1135 if (ioapic < 0)
1136 continue;
1137 pin = mp_find_ioapic_pin(ioapic, gsi);
1138 dstapic = mpc_ioapic_id(ioapic);
1139
1140 for (idx = 0; idx < mp_irq_entries; idx++) {
1141 struct mpc_intsrc *irq = mp_irqs + idx;
1142
1143 /* Do we already have a mapping for this ISA IRQ? */
1144 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1145 break;
1146
1147 /* Do we already have a mapping for this IOAPIC pin */
1148 if (irq->dstapic == dstapic && irq->dstirq == pin)
1149 break;
1150 }
1151
1152 if (idx != mp_irq_entries) {
1153 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1154 continue; /* IRQ already used */
1155 }
1156
1157 mp_irq.type = MP_INTSRC;
1158 mp_irq.irqflag = 0; /* Conforming */
1159 mp_irq.srcbus = MP_ISA_BUS;
1160 mp_irq.dstapic = dstapic;
1161 mp_irq.irqtype = mp_INT;
1162 mp_irq.srcbusirq = i; /* Identity mapped */
1163 mp_irq.dstirq = pin;
1164
1165 mp_save_irq(&mp_irq);
1166 }
1167}
1168
1169/*
1170 * Parse IOAPIC related entries in MADT
1171 * returns 0 on success, < 0 on error
1172 */
1173static int __init acpi_parse_madt_ioapic_entries(void)
1174{
1175 int count;
1176
1177 /*
1178 * ACPI interpreter is required to complete interrupt setup,
1179 * so if it is off, don't enumerate the io-apics with ACPI.
1180 * If MPS is present, it will handle them,
1181 * otherwise the system will stay in PIC mode
1182 */
1183 if (acpi_disabled || acpi_noirq)
1184 return -ENODEV;
1185
1186 if (!boot_cpu_has(X86_FEATURE_APIC))
1187 return -ENODEV;
1188
1189 /*
1190 * if "noapic" boot option, don't look for IO-APICs
1191 */
1192 if (skip_ioapic_setup) {
1193 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1194 "due to 'noapic' option.\n");
1195 return -ENODEV;
1196 }
1197
1198 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1199 MAX_IO_APICS);
1200 if (!count) {
1201 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1202 return -ENODEV;
1203 } else if (count < 0) {
1204 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1205 return count;
1206 }
1207
1208 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1209 acpi_parse_int_src_ovr, nr_irqs);
1210 if (count < 0) {
1211 printk(KERN_ERR PREFIX
1212 "Error parsing interrupt source overrides entry\n");
1213 /* TBD: Cleanup to allow fallback to MPS */
1214 return count;
1215 }
1216
1217 /*
1218 * If BIOS did not supply an INT_SRC_OVR for the SCI
1219 * pretend we got one so we can set the SCI flags.
1220 * But ignore setting up SCI on hardware reduced platforms.
1221 */
1222 if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
1223 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1224 acpi_gbl_FADT.sci_interrupt);
1225
1226 /* Fill in identity legacy mappings where no override */
1227 mp_config_acpi_legacy_irqs();
1228
1229 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1230 acpi_parse_nmi_src, nr_irqs);
1231 if (count < 0) {
1232 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1233 /* TBD: Cleanup to allow fallback to MPS */
1234 return count;
1235 }
1236
1237 return 0;
1238}
1239#else
1240static inline int acpi_parse_madt_ioapic_entries(void)
1241{
1242 return -1;
1243}
1244#endif /* !CONFIG_X86_IO_APIC */
1245
1246static void __init early_acpi_process_madt(void)
1247{
1248#ifdef CONFIG_X86_LOCAL_APIC
1249 int error;
1250
1251 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1252
1253 /*
1254 * Parse MADT LAPIC entries
1255 */
1256 error = early_acpi_parse_madt_lapic_addr_ovr();
1257 if (!error) {
1258 acpi_lapic = 1;
1259 smp_found_config = 1;
1260 }
1261 if (error == -EINVAL) {
1262 /*
1263 * Dell Precision Workstation 410, 610 come here.
1264 */
1265 printk(KERN_ERR PREFIX
1266 "Invalid BIOS MADT, disabling ACPI\n");
1267 disable_acpi();
1268 }
1269 }
1270#endif
1271}
1272
1273static void __init acpi_process_madt(void)
1274{
1275#ifdef CONFIG_X86_LOCAL_APIC
1276 int error;
1277
1278 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1279
1280 /*
1281 * Parse MADT LAPIC entries
1282 */
1283 error = acpi_parse_madt_lapic_entries();
1284 if (!error) {
1285 acpi_lapic = 1;
1286
1287 /*
1288 * Parse MADT IO-APIC entries
1289 */
1290 mutex_lock(&acpi_ioapic_lock);
1291 error = acpi_parse_madt_ioapic_entries();
1292 mutex_unlock(&acpi_ioapic_lock);
1293 if (!error) {
1294 acpi_set_irq_model_ioapic();
1295
1296 smp_found_config = 1;
1297 }
1298 }
1299 if (error == -EINVAL) {
1300 /*
1301 * Dell Precision Workstation 410, 610 come here.
1302 */
1303 printk(KERN_ERR PREFIX
1304 "Invalid BIOS MADT, disabling ACPI\n");
1305 disable_acpi();
1306 }
1307 } else {
1308 /*
1309 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1310 * In the event an MPS table was found, forget it.
1311 * Boot with "acpi=off" to use MPS on such a system.
1312 */
1313 if (smp_found_config) {
1314 printk(KERN_WARNING PREFIX
1315 "No APIC-table, disabling MPS\n");
1316 smp_found_config = 0;
1317 }
1318 }
1319
1320 /*
1321 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1322 * processors, where MPS only supports physical.
1323 */
1324 if (acpi_lapic && acpi_ioapic)
1325 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1326 "information\n");
1327 else if (acpi_lapic)
1328 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1329 "configuration information\n");
1330#endif
1331 return;
1332}
1333
1334static int __init disable_acpi_irq(const struct dmi_system_id *d)
1335{
1336 if (!acpi_force) {
1337 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1338 d->ident);
1339 acpi_noirq_set();
1340 }
1341 return 0;
1342}
1343
1344static int __init disable_acpi_pci(const struct dmi_system_id *d)
1345{
1346 if (!acpi_force) {
1347 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1348 d->ident);
1349 acpi_disable_pci();
1350 }
1351 return 0;
1352}
1353
1354static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1355{
1356 if (!acpi_force) {
1357 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1358 disable_acpi();
1359 } else {
1360 printk(KERN_NOTICE
1361 "Warning: DMI blacklist says broken, but acpi forced\n");
1362 }
1363 return 0;
1364}
1365
1366/*
1367 * Force ignoring BIOS IRQ0 override
1368 */
1369static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1370{
1371 if (!acpi_skip_timer_override) {
1372 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1373 d->ident);
1374 acpi_skip_timer_override = 1;
1375 }
1376 return 0;
1377}
1378
1379/*
1380 * ACPI offers an alternative platform interface model that removes
1381 * ACPI hardware requirements for platforms that do not implement
1382 * the PC Architecture.
1383 *
1384 * We initialize the Hardware-reduced ACPI model here:
1385 */
1386void __init acpi_generic_reduced_hw_init(void)
1387{
1388 /*
1389 * Override x86_init functions and bypass legacy PIC in
1390 * hardware reduced ACPI mode.
1391 */
1392 x86_init.timers.timer_init = x86_init_noop;
1393 x86_init.irqs.pre_vector_init = x86_init_noop;
1394 legacy_pic = &null_legacy_pic;
1395}
1396
1397static void __init acpi_reduced_hw_init(void)
1398{
1399 if (acpi_gbl_reduced_hardware)
1400 x86_init.acpi.reduced_hw_early_init();
1401}
1402
1403/*
1404 * If your system is blacklisted here, but you find that acpi=force
1405 * works for you, please contact linux-acpi@vger.kernel.org
1406 */
1407static const struct dmi_system_id acpi_dmi_table[] __initconst = {
1408 /*
1409 * Boxes that need ACPI disabled
1410 */
1411 {
1412 .callback = dmi_disable_acpi,
1413 .ident = "IBM Thinkpad",
1414 .matches = {
1415 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1416 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1417 },
1418 },
1419
1420 /*
1421 * Boxes that need ACPI PCI IRQ routing disabled
1422 */
1423 {
1424 .callback = disable_acpi_irq,
1425 .ident = "ASUS A7V",
1426 .matches = {
1427 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1428 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1429 /* newer BIOS, Revision 1011, does work */
1430 DMI_MATCH(DMI_BIOS_VERSION,
1431 "ASUS A7V ACPI BIOS Revision 1007"),
1432 },
1433 },
1434 {
1435 /*
1436 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1437 * for LPC bridge, which is needed for the PCI
1438 * interrupt links to work. DSDT fix is in bug 5966.
1439 * 2645, 2646 model numbers are shared with 600/600E/600X
1440 */
1441 .callback = disable_acpi_irq,
1442 .ident = "IBM Thinkpad 600 Series 2645",
1443 .matches = {
1444 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1445 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1446 },
1447 },
1448 {
1449 .callback = disable_acpi_irq,
1450 .ident = "IBM Thinkpad 600 Series 2646",
1451 .matches = {
1452 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1453 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1454 },
1455 },
1456 /*
1457 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1458 */
1459 { /* _BBN 0 bug */
1460 .callback = disable_acpi_pci,
1461 .ident = "ASUS PR-DLS",
1462 .matches = {
1463 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1464 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1465 DMI_MATCH(DMI_BIOS_VERSION,
1466 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1467 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1468 },
1469 },
1470 {
1471 .callback = disable_acpi_pci,
1472 .ident = "Acer TravelMate 36x Laptop",
1473 .matches = {
1474 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1475 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1476 },
1477 },
1478 {}
1479};
1480
1481/* second table for DMI checks that should run after early-quirks */
1482static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
1483 /*
1484 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1485 * which includes some code which overrides all temperature
1486 * trip points to 16C if the INTIN2 input of the I/O APIC
1487 * is enabled. This input is incorrectly designated the
1488 * ISA IRQ 0 via an interrupt source override even though
1489 * it is wired to the output of the master 8259A and INTIN0
1490 * is not connected at all. Force ignoring BIOS IRQ0
1491 * override in that cases.
1492 */
1493 {
1494 .callback = dmi_ignore_irq0_timer_override,
1495 .ident = "HP nx6115 laptop",
1496 .matches = {
1497 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1498 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1499 },
1500 },
1501 {
1502 .callback = dmi_ignore_irq0_timer_override,
1503 .ident = "HP NX6125 laptop",
1504 .matches = {
1505 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1506 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1507 },
1508 },
1509 {
1510 .callback = dmi_ignore_irq0_timer_override,
1511 .ident = "HP NX6325 laptop",
1512 .matches = {
1513 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1514 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1515 },
1516 },
1517 {
1518 .callback = dmi_ignore_irq0_timer_override,
1519 .ident = "HP 6715b laptop",
1520 .matches = {
1521 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1522 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1523 },
1524 },
1525 {
1526 .callback = dmi_ignore_irq0_timer_override,
1527 .ident = "FUJITSU SIEMENS",
1528 .matches = {
1529 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1530 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1531 },
1532 },
1533 {}
1534};
1535
1536/*
1537 * acpi_boot_table_init() and acpi_boot_init()
1538 * called from setup_arch(), always.
1539 * 1. checksums all tables
1540 * 2. enumerates lapics
1541 * 3. enumerates io-apics
1542 *
1543 * acpi_table_init() is separate to allow reading SRAT without
1544 * other side effects.
1545 *
1546 * side effects of acpi_boot_init:
1547 * acpi_lapic = 1 if LAPIC found
1548 * acpi_ioapic = 1 if IOAPIC found
1549 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1550 * if acpi_blacklisted() acpi_disabled = 1;
1551 * acpi_irq_model=...
1552 * ...
1553 */
1554
1555void __init acpi_boot_table_init(void)
1556{
1557 dmi_check_system(acpi_dmi_table);
1558
1559 /*
1560 * If acpi_disabled, bail out
1561 */
1562 if (acpi_disabled)
1563 return;
1564
1565 /*
1566 * Initialize the ACPI boot-time table parser.
1567 */
1568 if (acpi_table_init()) {
1569 disable_acpi();
1570 return;
1571 }
1572
1573 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1574
1575 /*
1576 * blacklist may disable ACPI entirely
1577 */
1578 if (acpi_blacklisted()) {
1579 if (acpi_force) {
1580 printk(KERN_WARNING PREFIX "acpi=force override\n");
1581 } else {
1582 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1583 disable_acpi();
1584 return;
1585 }
1586 }
1587}
1588
1589int __init early_acpi_boot_init(void)
1590{
1591 /*
1592 * If acpi_disabled, bail out
1593 */
1594 if (acpi_disabled)
1595 return 1;
1596
1597 /*
1598 * Process the Multiple APIC Description Table (MADT), if present
1599 */
1600 early_acpi_process_madt();
1601
1602 /*
1603 * Hardware-reduced ACPI mode initialization:
1604 */
1605 acpi_reduced_hw_init();
1606
1607 return 0;
1608}
1609
1610int __init acpi_boot_init(void)
1611{
1612 /* those are executed after early-quirks are executed */
1613 dmi_check_system(acpi_dmi_table_late);
1614
1615 /*
1616 * If acpi_disabled, bail out
1617 */
1618 if (acpi_disabled)
1619 return 1;
1620
1621 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1622
1623 /*
1624 * set sci_int and PM timer address
1625 */
1626 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1627
1628 /*
1629 * Process the Multiple APIC Description Table (MADT), if present
1630 */
1631 acpi_process_madt();
1632
1633 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1634 if (IS_ENABLED(CONFIG_ACPI_BGRT))
1635 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1636
1637 if (!acpi_noirq)
1638 x86_init.pci.init = pci_acpi_init;
1639
1640 /* Do not enable ACPI SPCR console by default */
1641 acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
1642 return 0;
1643}
1644
1645static int __init parse_acpi(char *arg)
1646{
1647 if (!arg)
1648 return -EINVAL;
1649
1650 /* "acpi=off" disables both ACPI table parsing and interpreter */
1651 if (strcmp(arg, "off") == 0) {
1652 disable_acpi();
1653 }
1654 /* acpi=force to over-ride black-list */
1655 else if (strcmp(arg, "force") == 0) {
1656 acpi_force = 1;
1657 acpi_disabled = 0;
1658 }
1659 /* acpi=strict disables out-of-spec workarounds */
1660 else if (strcmp(arg, "strict") == 0) {
1661 acpi_strict = 1;
1662 }
1663 /* acpi=rsdt use RSDT instead of XSDT */
1664 else if (strcmp(arg, "rsdt") == 0) {
1665 acpi_gbl_do_not_use_xsdt = TRUE;
1666 }
1667 /* "acpi=noirq" disables ACPI interrupt routing */
1668 else if (strcmp(arg, "noirq") == 0) {
1669 acpi_noirq_set();
1670 }
1671 /* "acpi=copy_dsdt" copys DSDT */
1672 else if (strcmp(arg, "copy_dsdt") == 0) {
1673 acpi_gbl_copy_dsdt_locally = 1;
1674 }
1675 /* "acpi=nocmcff" disables FF mode for corrected errors */
1676 else if (strcmp(arg, "nocmcff") == 0) {
1677 acpi_disable_cmcff = 1;
1678 } else {
1679 /* Core will printk when we return error. */
1680 return -EINVAL;
1681 }
1682 return 0;
1683}
1684early_param("acpi", parse_acpi);
1685
1686/* FIXME: Using pci= for an ACPI parameter is a travesty. */
1687static int __init parse_pci(char *arg)
1688{
1689 if (arg && strcmp(arg, "noacpi") == 0)
1690 acpi_disable_pci();
1691 return 0;
1692}
1693early_param("pci", parse_pci);
1694
1695int __init acpi_mps_check(void)
1696{
1697#if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1698/* mptable code is not built-in*/
1699 if (acpi_disabled || acpi_noirq) {
1700 printk(KERN_WARNING "MPS support code is not built-in.\n"
1701 "Using acpi=off or acpi=noirq or pci=noacpi "
1702 "may have problem\n");
1703 return 1;
1704 }
1705#endif
1706 return 0;
1707}
1708
1709#ifdef CONFIG_X86_IO_APIC
1710static int __init parse_acpi_skip_timer_override(char *arg)
1711{
1712 acpi_skip_timer_override = 1;
1713 return 0;
1714}
1715early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1716
1717static int __init parse_acpi_use_timer_override(char *arg)
1718{
1719 acpi_use_timer_override = 1;
1720 return 0;
1721}
1722early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1723#endif /* CONFIG_X86_IO_APIC */
1724
1725static int __init setup_acpi_sci(char *s)
1726{
1727 if (!s)
1728 return -EINVAL;
1729 if (!strcmp(s, "edge"))
1730 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1731 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1732 else if (!strcmp(s, "level"))
1733 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1734 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1735 else if (!strcmp(s, "high"))
1736 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1737 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1738 else if (!strcmp(s, "low"))
1739 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1740 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1741 else
1742 return -EINVAL;
1743 return 0;
1744}
1745early_param("acpi_sci", setup_acpi_sci);
1746
1747int __acpi_acquire_global_lock(unsigned int *lock)
1748{
1749 unsigned int old, new, val;
1750 do {
1751 old = *lock;
1752 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1753 val = cmpxchg(lock, old, new);
1754 } while (unlikely (val != old));
1755 return (new < 3) ? -1 : 0;
1756}
1757
1758int __acpi_release_global_lock(unsigned int *lock)
1759{
1760 unsigned int old, new, val;
1761 do {
1762 old = *lock;
1763 new = old & ~0x3;
1764 val = cmpxchg(lock, old, new);
1765 } while (unlikely (val != old));
1766 return old & 0x1;
1767}
1768
1769void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1770{
1771 e820__range_add(addr, size, E820_TYPE_ACPI);
1772 e820__update_table_print();
1773}
1/*
2 * boot.c - Architecture-Specific Low-Level ACPI Boot Support
3 *
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 * Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26#include <linux/init.h>
27#include <linux/acpi.h>
28#include <linux/acpi_pmtmr.h>
29#include <linux/efi.h>
30#include <linux/cpumask.h>
31#include <linux/module.h>
32#include <linux/dmi.h>
33#include <linux/irq.h>
34#include <linux/slab.h>
35#include <linux/bootmem.h>
36#include <linux/ioport.h>
37#include <linux/pci.h>
38
39#include <asm/pci_x86.h>
40#include <asm/pgtable.h>
41#include <asm/io_apic.h>
42#include <asm/apic.h>
43#include <asm/io.h>
44#include <asm/mpspec.h>
45#include <asm/smp.h>
46
47static int __initdata acpi_force = 0;
48u32 acpi_rsdt_forced;
49int acpi_disabled;
50EXPORT_SYMBOL(acpi_disabled);
51
52#ifdef CONFIG_X86_64
53# include <asm/proto.h>
54# include <asm/numa_64.h>
55#endif /* X86 */
56
57#define BAD_MADT_ENTRY(entry, end) ( \
58 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
59 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
60
61#define PREFIX "ACPI: "
62
63int acpi_noirq; /* skip ACPI IRQ initialization */
64int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
65EXPORT_SYMBOL(acpi_pci_disabled);
66
67int acpi_lapic;
68int acpi_ioapic;
69int acpi_strict;
70
71u8 acpi_sci_flags __initdata;
72int acpi_sci_override_gsi __initdata;
73int acpi_skip_timer_override __initdata;
74int acpi_use_timer_override __initdata;
75int acpi_fix_pin2_polarity __initdata;
76
77#ifdef CONFIG_X86_LOCAL_APIC
78static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
79#endif
80
81#ifndef __HAVE_ARCH_CMPXCHG
82#warning ACPI uses CMPXCHG, i486 and later hardware
83#endif
84
85/* --------------------------------------------------------------------------
86 Boot-time Configuration
87 -------------------------------------------------------------------------- */
88
89/*
90 * The default interrupt routing model is PIC (8259). This gets
91 * overridden if IOAPICs are enumerated (below).
92 */
93enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
94
95
96/*
97 * ISA irqs by default are the first 16 gsis but can be
98 * any gsi as specified by an interrupt source override.
99 */
100static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
101 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
102};
103
104static unsigned int gsi_to_irq(unsigned int gsi)
105{
106 unsigned int irq = gsi + NR_IRQS_LEGACY;
107 unsigned int i;
108
109 for (i = 0; i < NR_IRQS_LEGACY; i++) {
110 if (isa_irq_to_gsi[i] == gsi) {
111 return i;
112 }
113 }
114
115 /* Provide an identity mapping of gsi == irq
116 * except on truly weird platforms that have
117 * non isa irqs in the first 16 gsis.
118 */
119 if (gsi >= NR_IRQS_LEGACY)
120 irq = gsi;
121 else
122 irq = gsi_top + gsi;
123
124 return irq;
125}
126
127static u32 irq_to_gsi(int irq)
128{
129 unsigned int gsi;
130
131 if (irq < NR_IRQS_LEGACY)
132 gsi = isa_irq_to_gsi[irq];
133 else if (irq < gsi_top)
134 gsi = irq;
135 else if (irq < (gsi_top + NR_IRQS_LEGACY))
136 gsi = irq - gsi_top;
137 else
138 gsi = 0xffffffff;
139
140 return gsi;
141}
142
143/*
144 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
145 * to map the target physical address. The problem is that set_fixmap()
146 * provides a single page, and it is possible that the page is not
147 * sufficient.
148 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
149 * i.e. until the next __va_range() call.
150 *
151 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
152 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
153 * count idx down while incrementing the phys address.
154 */
155char *__init __acpi_map_table(unsigned long phys, unsigned long size)
156{
157
158 if (!phys || !size)
159 return NULL;
160
161 return early_ioremap(phys, size);
162}
163void __init __acpi_unmap_table(char *map, unsigned long size)
164{
165 if (!map || !size)
166 return;
167
168 early_iounmap(map, size);
169}
170
171#ifdef CONFIG_X86_LOCAL_APIC
172static int __init acpi_parse_madt(struct acpi_table_header *table)
173{
174 struct acpi_table_madt *madt = NULL;
175
176 if (!cpu_has_apic)
177 return -EINVAL;
178
179 madt = (struct acpi_table_madt *)table;
180 if (!madt) {
181 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
182 return -ENODEV;
183 }
184
185 if (madt->address) {
186 acpi_lapic_addr = (u64) madt->address;
187
188 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
189 madt->address);
190 }
191
192 default_acpi_madt_oem_check(madt->header.oem_id,
193 madt->header.oem_table_id);
194
195 return 0;
196}
197
198static void __cpuinit acpi_register_lapic(int id, u8 enabled)
199{
200 unsigned int ver = 0;
201
202 if (id >= (MAX_LOCAL_APIC-1)) {
203 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
204 return;
205 }
206
207 if (!enabled) {
208 ++disabled_cpus;
209 return;
210 }
211
212 if (boot_cpu_physical_apicid != -1U)
213 ver = apic_version[boot_cpu_physical_apicid];
214
215 generic_processor_info(id, ver);
216}
217
218static int __init
219acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
220{
221 struct acpi_madt_local_x2apic *processor = NULL;
222
223 processor = (struct acpi_madt_local_x2apic *)header;
224
225 if (BAD_MADT_ENTRY(processor, end))
226 return -EINVAL;
227
228 acpi_table_print_madt_entry(header);
229
230#ifdef CONFIG_X86_X2APIC
231 /*
232 * We need to register disabled CPU as well to permit
233 * counting disabled CPUs. This allows us to size
234 * cpus_possible_map more accurately, to permit
235 * to not preallocating memory for all NR_CPUS
236 * when we use CPU hotplug.
237 */
238 acpi_register_lapic(processor->local_apic_id, /* APIC ID */
239 processor->lapic_flags & ACPI_MADT_ENABLED);
240#else
241 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
242#endif
243
244 return 0;
245}
246
247static int __init
248acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
249{
250 struct acpi_madt_local_apic *processor = NULL;
251
252 processor = (struct acpi_madt_local_apic *)header;
253
254 if (BAD_MADT_ENTRY(processor, end))
255 return -EINVAL;
256
257 acpi_table_print_madt_entry(header);
258
259 /*
260 * We need to register disabled CPU as well to permit
261 * counting disabled CPUs. This allows us to size
262 * cpus_possible_map more accurately, to permit
263 * to not preallocating memory for all NR_CPUS
264 * when we use CPU hotplug.
265 */
266 acpi_register_lapic(processor->id, /* APIC ID */
267 processor->lapic_flags & ACPI_MADT_ENABLED);
268
269 return 0;
270}
271
272static int __init
273acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
274{
275 struct acpi_madt_local_sapic *processor = NULL;
276
277 processor = (struct acpi_madt_local_sapic *)header;
278
279 if (BAD_MADT_ENTRY(processor, end))
280 return -EINVAL;
281
282 acpi_table_print_madt_entry(header);
283
284 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
285 processor->lapic_flags & ACPI_MADT_ENABLED);
286
287 return 0;
288}
289
290static int __init
291acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
292 const unsigned long end)
293{
294 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
295
296 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
297
298 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
299 return -EINVAL;
300
301 acpi_lapic_addr = lapic_addr_ovr->address;
302
303 return 0;
304}
305
306static int __init
307acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
308 const unsigned long end)
309{
310 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
311
312 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
313
314 if (BAD_MADT_ENTRY(x2apic_nmi, end))
315 return -EINVAL;
316
317 acpi_table_print_madt_entry(header);
318
319 if (x2apic_nmi->lint != 1)
320 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
321
322 return 0;
323}
324
325static int __init
326acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
327{
328 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
329
330 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
331
332 if (BAD_MADT_ENTRY(lapic_nmi, end))
333 return -EINVAL;
334
335 acpi_table_print_madt_entry(header);
336
337 if (lapic_nmi->lint != 1)
338 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
339
340 return 0;
341}
342
343#endif /*CONFIG_X86_LOCAL_APIC */
344
345#ifdef CONFIG_X86_IO_APIC
346
347static int __init
348acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
349{
350 struct acpi_madt_io_apic *ioapic = NULL;
351
352 ioapic = (struct acpi_madt_io_apic *)header;
353
354 if (BAD_MADT_ENTRY(ioapic, end))
355 return -EINVAL;
356
357 acpi_table_print_madt_entry(header);
358
359 mp_register_ioapic(ioapic->id,
360 ioapic->address, ioapic->global_irq_base);
361
362 return 0;
363}
364
365/*
366 * Parse Interrupt Source Override for the ACPI SCI
367 */
368static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
369{
370 if (trigger == 0) /* compatible SCI trigger is level */
371 trigger = 3;
372
373 if (polarity == 0) /* compatible SCI polarity is low */
374 polarity = 3;
375
376 /* Command-line over-ride via acpi_sci= */
377 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
378 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
379
380 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
381 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
382
383 /*
384 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
385 * If GSI is < 16, this will update its flags,
386 * else it will create a new mp_irqs[] entry.
387 */
388 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
389
390 /*
391 * stash over-ride to indicate we've been here
392 * and for later update of acpi_gbl_FADT
393 */
394 acpi_sci_override_gsi = gsi;
395 return;
396}
397
398static int __init
399acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
400 const unsigned long end)
401{
402 struct acpi_madt_interrupt_override *intsrc = NULL;
403
404 intsrc = (struct acpi_madt_interrupt_override *)header;
405
406 if (BAD_MADT_ENTRY(intsrc, end))
407 return -EINVAL;
408
409 acpi_table_print_madt_entry(header);
410
411 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
412 acpi_sci_ioapic_setup(intsrc->source_irq,
413 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
414 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
415 intsrc->global_irq);
416 return 0;
417 }
418
419 if (intsrc->source_irq == 0 && intsrc->global_irq == 2) {
420 if (acpi_skip_timer_override) {
421 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
422 return 0;
423 }
424 if (acpi_fix_pin2_polarity && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
425 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
426 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
427 }
428 }
429
430 mp_override_legacy_irq(intsrc->source_irq,
431 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
432 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
433 intsrc->global_irq);
434
435 return 0;
436}
437
438static int __init
439acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
440{
441 struct acpi_madt_nmi_source *nmi_src = NULL;
442
443 nmi_src = (struct acpi_madt_nmi_source *)header;
444
445 if (BAD_MADT_ENTRY(nmi_src, end))
446 return -EINVAL;
447
448 acpi_table_print_madt_entry(header);
449
450 /* TBD: Support nimsrc entries? */
451
452 return 0;
453}
454
455#endif /* CONFIG_X86_IO_APIC */
456
457/*
458 * acpi_pic_sci_set_trigger()
459 *
460 * use ELCR to set PIC-mode trigger type for SCI
461 *
462 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
463 * it may require Edge Trigger -- use "acpi_sci=edge"
464 *
465 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
466 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
467 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
468 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
469 */
470
471void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
472{
473 unsigned int mask = 1 << irq;
474 unsigned int old, new;
475
476 /* Real old ELCR mask */
477 old = inb(0x4d0) | (inb(0x4d1) << 8);
478
479 /*
480 * If we use ACPI to set PCI IRQs, then we should clear ELCR
481 * since we will set it correctly as we enable the PCI irq
482 * routing.
483 */
484 new = acpi_noirq ? old : 0;
485
486 /*
487 * Update SCI information in the ELCR, it isn't in the PCI
488 * routing tables..
489 */
490 switch (trigger) {
491 case 1: /* Edge - clear */
492 new &= ~mask;
493 break;
494 case 3: /* Level - set */
495 new |= mask;
496 break;
497 }
498
499 if (old == new)
500 return;
501
502 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
503 outb(new, 0x4d0);
504 outb(new >> 8, 0x4d1);
505}
506
507int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
508{
509 *irq = gsi_to_irq(gsi);
510
511#ifdef CONFIG_X86_IO_APIC
512 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
513 setup_IO_APIC_irq_extra(gsi);
514#endif
515
516 return 0;
517}
518EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
519
520int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
521{
522 if (isa_irq >= 16)
523 return -1;
524 *gsi = irq_to_gsi(isa_irq);
525 return 0;
526}
527
528static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
529 int trigger, int polarity)
530{
531#ifdef CONFIG_PCI
532 /*
533 * Make sure all (legacy) PCI IRQs are set as level-triggered.
534 */
535 if (trigger == ACPI_LEVEL_SENSITIVE)
536 eisa_set_level_irq(gsi);
537#endif
538
539 return gsi;
540}
541
542static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
543 int trigger, int polarity)
544{
545#ifdef CONFIG_X86_IO_APIC
546 gsi = mp_register_gsi(dev, gsi, trigger, polarity);
547#endif
548
549 return gsi;
550}
551
552int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
553 int trigger, int polarity) = acpi_register_gsi_pic;
554
555/*
556 * success: return IRQ number (>=0)
557 * failure: return < 0
558 */
559int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
560{
561 unsigned int irq;
562 unsigned int plat_gsi = gsi;
563
564 plat_gsi = (*__acpi_register_gsi)(dev, gsi, trigger, polarity);
565 irq = gsi_to_irq(plat_gsi);
566
567 return irq;
568}
569
570void __init acpi_set_irq_model_pic(void)
571{
572 acpi_irq_model = ACPI_IRQ_MODEL_PIC;
573 __acpi_register_gsi = acpi_register_gsi_pic;
574 acpi_ioapic = 0;
575}
576
577void __init acpi_set_irq_model_ioapic(void)
578{
579 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
580 __acpi_register_gsi = acpi_register_gsi_ioapic;
581 acpi_ioapic = 1;
582}
583
584/*
585 * ACPI based hotplug support for CPU
586 */
587#ifdef CONFIG_ACPI_HOTPLUG_CPU
588#include <acpi/processor.h>
589
590static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
591{
592#ifdef CONFIG_ACPI_NUMA
593 int nid;
594
595 nid = acpi_get_node(handle);
596 if (nid == -1 || !node_online(nid))
597 return;
598 set_apicid_to_node(physid, nid);
599 numa_set_node(cpu, nid);
600#endif
601}
602
603static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
604{
605 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
606 union acpi_object *obj;
607 struct acpi_madt_local_apic *lapic;
608 cpumask_var_t tmp_map, new_map;
609 u8 physid;
610 int cpu;
611 int retval = -ENOMEM;
612
613 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
614 return -EINVAL;
615
616 if (!buffer.length || !buffer.pointer)
617 return -EINVAL;
618
619 obj = buffer.pointer;
620 if (obj->type != ACPI_TYPE_BUFFER ||
621 obj->buffer.length < sizeof(*lapic)) {
622 kfree(buffer.pointer);
623 return -EINVAL;
624 }
625
626 lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
627
628 if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
629 !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
630 kfree(buffer.pointer);
631 return -EINVAL;
632 }
633
634 physid = lapic->id;
635
636 kfree(buffer.pointer);
637 buffer.length = ACPI_ALLOCATE_BUFFER;
638 buffer.pointer = NULL;
639
640 if (!alloc_cpumask_var(&tmp_map, GFP_KERNEL))
641 goto out;
642
643 if (!alloc_cpumask_var(&new_map, GFP_KERNEL))
644 goto free_tmp_map;
645
646 cpumask_copy(tmp_map, cpu_present_mask);
647 acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
648
649 /*
650 * If mp_register_lapic successfully generates a new logical cpu
651 * number, then the following will get us exactly what was mapped
652 */
653 cpumask_andnot(new_map, cpu_present_mask, tmp_map);
654 if (cpumask_empty(new_map)) {
655 printk ("Unable to map lapic to logical cpu number\n");
656 retval = -EINVAL;
657 goto free_new_map;
658 }
659
660 acpi_processor_set_pdc(handle);
661
662 cpu = cpumask_first(new_map);
663 acpi_map_cpu2node(handle, cpu, physid);
664
665 *pcpu = cpu;
666 retval = 0;
667
668free_new_map:
669 free_cpumask_var(new_map);
670free_tmp_map:
671 free_cpumask_var(tmp_map);
672out:
673 return retval;
674}
675
676/* wrapper to silence section mismatch warning */
677int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
678{
679 return _acpi_map_lsapic(handle, pcpu);
680}
681EXPORT_SYMBOL(acpi_map_lsapic);
682
683int acpi_unmap_lsapic(int cpu)
684{
685 per_cpu(x86_cpu_to_apicid, cpu) = -1;
686 set_cpu_present(cpu, false);
687 num_processors--;
688
689 return (0);
690}
691
692EXPORT_SYMBOL(acpi_unmap_lsapic);
693#endif /* CONFIG_ACPI_HOTPLUG_CPU */
694
695int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
696{
697 /* TBD */
698 return -EINVAL;
699}
700
701EXPORT_SYMBOL(acpi_register_ioapic);
702
703int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
704{
705 /* TBD */
706 return -EINVAL;
707}
708
709EXPORT_SYMBOL(acpi_unregister_ioapic);
710
711static int __init acpi_parse_sbf(struct acpi_table_header *table)
712{
713 struct acpi_table_boot *sb;
714
715 sb = (struct acpi_table_boot *)table;
716 if (!sb) {
717 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
718 return -ENODEV;
719 }
720
721 sbf_port = sb->cmos_index; /* Save CMOS port */
722
723 return 0;
724}
725
726#ifdef CONFIG_HPET_TIMER
727#include <asm/hpet.h>
728
729static struct __initdata resource *hpet_res;
730
731static int __init acpi_parse_hpet(struct acpi_table_header *table)
732{
733 struct acpi_table_hpet *hpet_tbl;
734
735 hpet_tbl = (struct acpi_table_hpet *)table;
736 if (!hpet_tbl) {
737 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
738 return -ENODEV;
739 }
740
741 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
742 printk(KERN_WARNING PREFIX "HPET timers must be located in "
743 "memory.\n");
744 return -1;
745 }
746
747 hpet_address = hpet_tbl->address.address;
748 hpet_blockid = hpet_tbl->sequence;
749
750 /*
751 * Some broken BIOSes advertise HPET at 0x0. We really do not
752 * want to allocate a resource there.
753 */
754 if (!hpet_address) {
755 printk(KERN_WARNING PREFIX
756 "HPET id: %#x base: %#lx is invalid\n",
757 hpet_tbl->id, hpet_address);
758 return 0;
759 }
760#ifdef CONFIG_X86_64
761 /*
762 * Some even more broken BIOSes advertise HPET at
763 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
764 * some noise:
765 */
766 if (hpet_address == 0xfed0000000000000UL) {
767 if (!hpet_force_user) {
768 printk(KERN_WARNING PREFIX "HPET id: %#x "
769 "base: 0xfed0000000000000 is bogus\n "
770 "try hpet=force on the kernel command line to "
771 "fix it up to 0xfed00000.\n", hpet_tbl->id);
772 hpet_address = 0;
773 return 0;
774 }
775 printk(KERN_WARNING PREFIX
776 "HPET id: %#x base: 0xfed0000000000000 fixed up "
777 "to 0xfed00000.\n", hpet_tbl->id);
778 hpet_address >>= 32;
779 }
780#endif
781 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
782 hpet_tbl->id, hpet_address);
783
784 /*
785 * Allocate and initialize the HPET firmware resource for adding into
786 * the resource tree during the lateinit timeframe.
787 */
788#define HPET_RESOURCE_NAME_SIZE 9
789 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
790
791 hpet_res->name = (void *)&hpet_res[1];
792 hpet_res->flags = IORESOURCE_MEM;
793 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
794 hpet_tbl->sequence);
795
796 hpet_res->start = hpet_address;
797 hpet_res->end = hpet_address + (1 * 1024) - 1;
798
799 return 0;
800}
801
802/*
803 * hpet_insert_resource inserts the HPET resources used into the resource
804 * tree.
805 */
806static __init int hpet_insert_resource(void)
807{
808 if (!hpet_res)
809 return 1;
810
811 return insert_resource(&iomem_resource, hpet_res);
812}
813
814late_initcall(hpet_insert_resource);
815
816#else
817#define acpi_parse_hpet NULL
818#endif
819
820static int __init acpi_parse_fadt(struct acpi_table_header *table)
821{
822
823#ifdef CONFIG_X86_PM_TIMER
824 /* detect the location of the ACPI PM Timer */
825 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
826 /* FADT rev. 2 */
827 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
828 ACPI_ADR_SPACE_SYSTEM_IO)
829 return 0;
830
831 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
832 /*
833 * "X" fields are optional extensions to the original V1.0
834 * fields, so we must selectively expand V1.0 fields if the
835 * corresponding X field is zero.
836 */
837 if (!pmtmr_ioport)
838 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
839 } else {
840 /* FADT rev. 1 */
841 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
842 }
843 if (pmtmr_ioport)
844 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
845 pmtmr_ioport);
846#endif
847 return 0;
848}
849
850#ifdef CONFIG_X86_LOCAL_APIC
851/*
852 * Parse LAPIC entries in MADT
853 * returns 0 on success, < 0 on error
854 */
855
856static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
857{
858 int count;
859
860 if (!cpu_has_apic)
861 return -ENODEV;
862
863 /*
864 * Note that the LAPIC address is obtained from the MADT (32-bit value)
865 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
866 */
867
868 count =
869 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
870 acpi_parse_lapic_addr_ovr, 0);
871 if (count < 0) {
872 printk(KERN_ERR PREFIX
873 "Error parsing LAPIC address override entry\n");
874 return count;
875 }
876
877 register_lapic_address(acpi_lapic_addr);
878
879 return count;
880}
881
882static int __init acpi_parse_madt_lapic_entries(void)
883{
884 int count;
885 int x2count = 0;
886
887 if (!cpu_has_apic)
888 return -ENODEV;
889
890 /*
891 * Note that the LAPIC address is obtained from the MADT (32-bit value)
892 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
893 */
894
895 count =
896 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
897 acpi_parse_lapic_addr_ovr, 0);
898 if (count < 0) {
899 printk(KERN_ERR PREFIX
900 "Error parsing LAPIC address override entry\n");
901 return count;
902 }
903
904 register_lapic_address(acpi_lapic_addr);
905
906 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
907 acpi_parse_sapic, MAX_LOCAL_APIC);
908
909 if (!count) {
910 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
911 acpi_parse_x2apic, MAX_LOCAL_APIC);
912 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
913 acpi_parse_lapic, MAX_LOCAL_APIC);
914 }
915 if (!count && !x2count) {
916 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
917 /* TBD: Cleanup to allow fallback to MPS */
918 return -ENODEV;
919 } else if (count < 0 || x2count < 0) {
920 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
921 /* TBD: Cleanup to allow fallback to MPS */
922 return count;
923 }
924
925 x2count =
926 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
927 acpi_parse_x2apic_nmi, 0);
928 count =
929 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
930 if (count < 0 || x2count < 0) {
931 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
932 /* TBD: Cleanup to allow fallback to MPS */
933 return count;
934 }
935 return 0;
936}
937#endif /* CONFIG_X86_LOCAL_APIC */
938
939#ifdef CONFIG_X86_IO_APIC
940#define MP_ISA_BUS 0
941
942#ifdef CONFIG_X86_ES7000
943extern int es7000_plat;
944#endif
945
946void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
947{
948 int ioapic;
949 int pin;
950 struct mpc_intsrc mp_irq;
951
952 /*
953 * Convert 'gsi' to 'ioapic.pin'.
954 */
955 ioapic = mp_find_ioapic(gsi);
956 if (ioapic < 0)
957 return;
958 pin = mp_find_ioapic_pin(ioapic, gsi);
959
960 /*
961 * TBD: This check is for faulty timer entries, where the override
962 * erroneously sets the trigger to level, resulting in a HUGE
963 * increase of timer interrupts!
964 */
965 if ((bus_irq == 0) && (trigger == 3))
966 trigger = 1;
967
968 mp_irq.type = MP_INTSRC;
969 mp_irq.irqtype = mp_INT;
970 mp_irq.irqflag = (trigger << 2) | polarity;
971 mp_irq.srcbus = MP_ISA_BUS;
972 mp_irq.srcbusirq = bus_irq; /* IRQ */
973 mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
974 mp_irq.dstirq = pin; /* INTIN# */
975
976 mp_save_irq(&mp_irq);
977
978 isa_irq_to_gsi[bus_irq] = gsi;
979}
980
981void __init mp_config_acpi_legacy_irqs(void)
982{
983 int i;
984 struct mpc_intsrc mp_irq;
985
986#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
987 /*
988 * Fabricate the legacy ISA bus (bus #31).
989 */
990 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
991#endif
992 set_bit(MP_ISA_BUS, mp_bus_not_pci);
993 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
994
995#ifdef CONFIG_X86_ES7000
996 /*
997 * Older generations of ES7000 have no legacy identity mappings
998 */
999 if (es7000_plat == 1)
1000 return;
1001#endif
1002
1003 /*
1004 * Use the default configuration for the IRQs 0-15. Unless
1005 * overridden by (MADT) interrupt source override entries.
1006 */
1007 for (i = 0; i < 16; i++) {
1008 int ioapic, pin;
1009 unsigned int dstapic;
1010 int idx;
1011 u32 gsi;
1012
1013 /* Locate the gsi that irq i maps to. */
1014 if (acpi_isa_irq_to_gsi(i, &gsi))
1015 continue;
1016
1017 /*
1018 * Locate the IOAPIC that manages the ISA IRQ.
1019 */
1020 ioapic = mp_find_ioapic(gsi);
1021 if (ioapic < 0)
1022 continue;
1023 pin = mp_find_ioapic_pin(ioapic, gsi);
1024 dstapic = mpc_ioapic_id(ioapic);
1025
1026 for (idx = 0; idx < mp_irq_entries; idx++) {
1027 struct mpc_intsrc *irq = mp_irqs + idx;
1028
1029 /* Do we already have a mapping for this ISA IRQ? */
1030 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1031 break;
1032
1033 /* Do we already have a mapping for this IOAPIC pin */
1034 if (irq->dstapic == dstapic && irq->dstirq == pin)
1035 break;
1036 }
1037
1038 if (idx != mp_irq_entries) {
1039 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1040 continue; /* IRQ already used */
1041 }
1042
1043 mp_irq.type = MP_INTSRC;
1044 mp_irq.irqflag = 0; /* Conforming */
1045 mp_irq.srcbus = MP_ISA_BUS;
1046 mp_irq.dstapic = dstapic;
1047 mp_irq.irqtype = mp_INT;
1048 mp_irq.srcbusirq = i; /* Identity mapped */
1049 mp_irq.dstirq = pin;
1050
1051 mp_save_irq(&mp_irq);
1052 }
1053}
1054
1055static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
1056 int polarity)
1057{
1058#ifdef CONFIG_X86_MPPARSE
1059 struct mpc_intsrc mp_irq;
1060 struct pci_dev *pdev;
1061 unsigned char number;
1062 unsigned int devfn;
1063 int ioapic;
1064 u8 pin;
1065
1066 if (!acpi_ioapic)
1067 return 0;
1068 if (!dev)
1069 return 0;
1070 if (dev->bus != &pci_bus_type)
1071 return 0;
1072
1073 pdev = to_pci_dev(dev);
1074 number = pdev->bus->number;
1075 devfn = pdev->devfn;
1076 pin = pdev->pin;
1077 /* print the entry should happen on mptable identically */
1078 mp_irq.type = MP_INTSRC;
1079 mp_irq.irqtype = mp_INT;
1080 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
1081 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
1082 mp_irq.srcbus = number;
1083 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
1084 ioapic = mp_find_ioapic(gsi);
1085 mp_irq.dstapic = mpc_ioapic_id(ioapic);
1086 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
1087
1088 mp_save_irq(&mp_irq);
1089#endif
1090 return 0;
1091}
1092
1093int mp_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
1094{
1095 int ioapic;
1096 int ioapic_pin;
1097 struct io_apic_irq_attr irq_attr;
1098
1099 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
1100 return gsi;
1101
1102 /* Don't set up the ACPI SCI because it's already set up */
1103 if (acpi_gbl_FADT.sci_interrupt == gsi)
1104 return gsi;
1105
1106 ioapic = mp_find_ioapic(gsi);
1107 if (ioapic < 0) {
1108 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1109 return gsi;
1110 }
1111
1112 ioapic_pin = mp_find_ioapic_pin(ioapic, gsi);
1113
1114 if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
1115 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1116 "%d-%d\n", mpc_ioapic_id(ioapic),
1117 ioapic_pin);
1118 return gsi;
1119 }
1120
1121 if (enable_update_mptable)
1122 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
1123
1124 set_io_apic_irq_attr(&irq_attr, ioapic, ioapic_pin,
1125 trigger == ACPI_EDGE_SENSITIVE ? 0 : 1,
1126 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1127 io_apic_set_pci_routing(dev, gsi_to_irq(gsi), &irq_attr);
1128
1129 return gsi;
1130}
1131
1132/*
1133 * Parse IOAPIC related entries in MADT
1134 * returns 0 on success, < 0 on error
1135 */
1136static int __init acpi_parse_madt_ioapic_entries(void)
1137{
1138 int count;
1139
1140 /*
1141 * ACPI interpreter is required to complete interrupt setup,
1142 * so if it is off, don't enumerate the io-apics with ACPI.
1143 * If MPS is present, it will handle them,
1144 * otherwise the system will stay in PIC mode
1145 */
1146 if (acpi_disabled || acpi_noirq)
1147 return -ENODEV;
1148
1149 if (!cpu_has_apic)
1150 return -ENODEV;
1151
1152 /*
1153 * if "noapic" boot option, don't look for IO-APICs
1154 */
1155 if (skip_ioapic_setup) {
1156 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1157 "due to 'noapic' option.\n");
1158 return -ENODEV;
1159 }
1160
1161 count =
1162 acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1163 MAX_IO_APICS);
1164 if (!count) {
1165 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1166 return -ENODEV;
1167 } else if (count < 0) {
1168 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1169 return count;
1170 }
1171
1172 count =
1173 acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
1174 nr_irqs);
1175 if (count < 0) {
1176 printk(KERN_ERR PREFIX
1177 "Error parsing interrupt source overrides entry\n");
1178 /* TBD: Cleanup to allow fallback to MPS */
1179 return count;
1180 }
1181
1182 /*
1183 * If BIOS did not supply an INT_SRC_OVR for the SCI
1184 * pretend we got one so we can set the SCI flags.
1185 */
1186 if (!acpi_sci_override_gsi)
1187 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1188 acpi_gbl_FADT.sci_interrupt);
1189
1190 /* Fill in identity legacy mappings where no override */
1191 mp_config_acpi_legacy_irqs();
1192
1193 count =
1194 acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
1195 nr_irqs);
1196 if (count < 0) {
1197 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1198 /* TBD: Cleanup to allow fallback to MPS */
1199 return count;
1200 }
1201
1202 return 0;
1203}
1204#else
1205static inline int acpi_parse_madt_ioapic_entries(void)
1206{
1207 return -1;
1208}
1209#endif /* !CONFIG_X86_IO_APIC */
1210
1211static void __init early_acpi_process_madt(void)
1212{
1213#ifdef CONFIG_X86_LOCAL_APIC
1214 int error;
1215
1216 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1217
1218 /*
1219 * Parse MADT LAPIC entries
1220 */
1221 error = early_acpi_parse_madt_lapic_addr_ovr();
1222 if (!error) {
1223 acpi_lapic = 1;
1224 smp_found_config = 1;
1225 }
1226 if (error == -EINVAL) {
1227 /*
1228 * Dell Precision Workstation 410, 610 come here.
1229 */
1230 printk(KERN_ERR PREFIX
1231 "Invalid BIOS MADT, disabling ACPI\n");
1232 disable_acpi();
1233 }
1234 }
1235#endif
1236}
1237
1238static void __init acpi_process_madt(void)
1239{
1240#ifdef CONFIG_X86_LOCAL_APIC
1241 int error;
1242
1243 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1244
1245 /*
1246 * Parse MADT LAPIC entries
1247 */
1248 error = acpi_parse_madt_lapic_entries();
1249 if (!error) {
1250 acpi_lapic = 1;
1251
1252 /*
1253 * Parse MADT IO-APIC entries
1254 */
1255 error = acpi_parse_madt_ioapic_entries();
1256 if (!error) {
1257 acpi_set_irq_model_ioapic();
1258
1259 smp_found_config = 1;
1260 }
1261 }
1262 if (error == -EINVAL) {
1263 /*
1264 * Dell Precision Workstation 410, 610 come here.
1265 */
1266 printk(KERN_ERR PREFIX
1267 "Invalid BIOS MADT, disabling ACPI\n");
1268 disable_acpi();
1269 }
1270 } else {
1271 /*
1272 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1273 * In the event an MPS table was found, forget it.
1274 * Boot with "acpi=off" to use MPS on such a system.
1275 */
1276 if (smp_found_config) {
1277 printk(KERN_WARNING PREFIX
1278 "No APIC-table, disabling MPS\n");
1279 smp_found_config = 0;
1280 }
1281 }
1282
1283 /*
1284 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1285 * processors, where MPS only supports physical.
1286 */
1287 if (acpi_lapic && acpi_ioapic)
1288 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1289 "information\n");
1290 else if (acpi_lapic)
1291 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1292 "configuration information\n");
1293#endif
1294 return;
1295}
1296
1297static int __init disable_acpi_irq(const struct dmi_system_id *d)
1298{
1299 if (!acpi_force) {
1300 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1301 d->ident);
1302 acpi_noirq_set();
1303 }
1304 return 0;
1305}
1306
1307static int __init disable_acpi_pci(const struct dmi_system_id *d)
1308{
1309 if (!acpi_force) {
1310 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1311 d->ident);
1312 acpi_disable_pci();
1313 }
1314 return 0;
1315}
1316
1317static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1318{
1319 if (!acpi_force) {
1320 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1321 disable_acpi();
1322 } else {
1323 printk(KERN_NOTICE
1324 "Warning: DMI blacklist says broken, but acpi forced\n");
1325 }
1326 return 0;
1327}
1328
1329/*
1330 * Force ignoring BIOS IRQ0 pin2 override
1331 */
1332static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1333{
1334 /*
1335 * The ati_ixp4x0_rev() early PCI quirk should have set
1336 * the acpi_skip_timer_override flag already:
1337 */
1338 if (!acpi_skip_timer_override) {
1339 WARN(1, KERN_ERR "ati_ixp4x0 quirk not complete.\n");
1340 pr_notice("%s detected: Ignoring BIOS IRQ0 pin2 override\n",
1341 d->ident);
1342 acpi_skip_timer_override = 1;
1343 }
1344 return 0;
1345}
1346
1347/*
1348 * If your system is blacklisted here, but you find that acpi=force
1349 * works for you, please contact linux-acpi@vger.kernel.org
1350 */
1351static struct dmi_system_id __initdata acpi_dmi_table[] = {
1352 /*
1353 * Boxes that need ACPI disabled
1354 */
1355 {
1356 .callback = dmi_disable_acpi,
1357 .ident = "IBM Thinkpad",
1358 .matches = {
1359 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1360 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1361 },
1362 },
1363
1364 /*
1365 * Boxes that need ACPI PCI IRQ routing disabled
1366 */
1367 {
1368 .callback = disable_acpi_irq,
1369 .ident = "ASUS A7V",
1370 .matches = {
1371 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1372 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1373 /* newer BIOS, Revision 1011, does work */
1374 DMI_MATCH(DMI_BIOS_VERSION,
1375 "ASUS A7V ACPI BIOS Revision 1007"),
1376 },
1377 },
1378 {
1379 /*
1380 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1381 * for LPC bridge, which is needed for the PCI
1382 * interrupt links to work. DSDT fix is in bug 5966.
1383 * 2645, 2646 model numbers are shared with 600/600E/600X
1384 */
1385 .callback = disable_acpi_irq,
1386 .ident = "IBM Thinkpad 600 Series 2645",
1387 .matches = {
1388 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1389 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1390 },
1391 },
1392 {
1393 .callback = disable_acpi_irq,
1394 .ident = "IBM Thinkpad 600 Series 2646",
1395 .matches = {
1396 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1397 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1398 },
1399 },
1400 /*
1401 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1402 */
1403 { /* _BBN 0 bug */
1404 .callback = disable_acpi_pci,
1405 .ident = "ASUS PR-DLS",
1406 .matches = {
1407 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1408 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1409 DMI_MATCH(DMI_BIOS_VERSION,
1410 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1411 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1412 },
1413 },
1414 {
1415 .callback = disable_acpi_pci,
1416 .ident = "Acer TravelMate 36x Laptop",
1417 .matches = {
1418 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1419 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1420 },
1421 },
1422 {}
1423};
1424
1425/* second table for DMI checks that should run after early-quirks */
1426static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1427 /*
1428 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1429 * which includes some code which overrides all temperature
1430 * trip points to 16C if the INTIN2 input of the I/O APIC
1431 * is enabled. This input is incorrectly designated the
1432 * ISA IRQ 0 via an interrupt source override even though
1433 * it is wired to the output of the master 8259A and INTIN0
1434 * is not connected at all. Force ignoring BIOS IRQ0 pin2
1435 * override in that cases.
1436 */
1437 {
1438 .callback = dmi_ignore_irq0_timer_override,
1439 .ident = "HP nx6115 laptop",
1440 .matches = {
1441 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1442 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1443 },
1444 },
1445 {
1446 .callback = dmi_ignore_irq0_timer_override,
1447 .ident = "HP NX6125 laptop",
1448 .matches = {
1449 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1450 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1451 },
1452 },
1453 {
1454 .callback = dmi_ignore_irq0_timer_override,
1455 .ident = "HP NX6325 laptop",
1456 .matches = {
1457 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1458 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1459 },
1460 },
1461 {
1462 .callback = dmi_ignore_irq0_timer_override,
1463 .ident = "HP 6715b laptop",
1464 .matches = {
1465 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1466 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1467 },
1468 },
1469 {}
1470};
1471
1472/*
1473 * acpi_boot_table_init() and acpi_boot_init()
1474 * called from setup_arch(), always.
1475 * 1. checksums all tables
1476 * 2. enumerates lapics
1477 * 3. enumerates io-apics
1478 *
1479 * acpi_table_init() is separate to allow reading SRAT without
1480 * other side effects.
1481 *
1482 * side effects of acpi_boot_init:
1483 * acpi_lapic = 1 if LAPIC found
1484 * acpi_ioapic = 1 if IOAPIC found
1485 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1486 * if acpi_blacklisted() acpi_disabled = 1;
1487 * acpi_irq_model=...
1488 * ...
1489 */
1490
1491void __init acpi_boot_table_init(void)
1492{
1493 dmi_check_system(acpi_dmi_table);
1494
1495 /*
1496 * If acpi_disabled, bail out
1497 */
1498 if (acpi_disabled)
1499 return;
1500
1501 /*
1502 * Initialize the ACPI boot-time table parser.
1503 */
1504 if (acpi_table_init()) {
1505 disable_acpi();
1506 return;
1507 }
1508
1509 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1510
1511 /*
1512 * blacklist may disable ACPI entirely
1513 */
1514 if (acpi_blacklisted()) {
1515 if (acpi_force) {
1516 printk(KERN_WARNING PREFIX "acpi=force override\n");
1517 } else {
1518 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1519 disable_acpi();
1520 return;
1521 }
1522 }
1523}
1524
1525int __init early_acpi_boot_init(void)
1526{
1527 /*
1528 * If acpi_disabled, bail out
1529 */
1530 if (acpi_disabled)
1531 return 1;
1532
1533 /*
1534 * Process the Multiple APIC Description Table (MADT), if present
1535 */
1536 early_acpi_process_madt();
1537
1538 return 0;
1539}
1540
1541int __init acpi_boot_init(void)
1542{
1543 /* those are executed after early-quirks are executed */
1544 dmi_check_system(acpi_dmi_table_late);
1545
1546 /*
1547 * If acpi_disabled, bail out
1548 */
1549 if (acpi_disabled)
1550 return 1;
1551
1552 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1553
1554 /*
1555 * set sci_int and PM timer address
1556 */
1557 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1558
1559 /*
1560 * Process the Multiple APIC Description Table (MADT), if present
1561 */
1562 acpi_process_madt();
1563
1564 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1565
1566 if (!acpi_noirq)
1567 x86_init.pci.init = pci_acpi_init;
1568
1569 return 0;
1570}
1571
1572static int __init parse_acpi(char *arg)
1573{
1574 if (!arg)
1575 return -EINVAL;
1576
1577 /* "acpi=off" disables both ACPI table parsing and interpreter */
1578 if (strcmp(arg, "off") == 0) {
1579 disable_acpi();
1580 }
1581 /* acpi=force to over-ride black-list */
1582 else if (strcmp(arg, "force") == 0) {
1583 acpi_force = 1;
1584 acpi_disabled = 0;
1585 }
1586 /* acpi=strict disables out-of-spec workarounds */
1587 else if (strcmp(arg, "strict") == 0) {
1588 acpi_strict = 1;
1589 }
1590 /* acpi=rsdt use RSDT instead of XSDT */
1591 else if (strcmp(arg, "rsdt") == 0) {
1592 acpi_rsdt_forced = 1;
1593 }
1594 /* "acpi=noirq" disables ACPI interrupt routing */
1595 else if (strcmp(arg, "noirq") == 0) {
1596 acpi_noirq_set();
1597 }
1598 /* "acpi=copy_dsdt" copys DSDT */
1599 else if (strcmp(arg, "copy_dsdt") == 0) {
1600 acpi_gbl_copy_dsdt_locally = 1;
1601 } else {
1602 /* Core will printk when we return error. */
1603 return -EINVAL;
1604 }
1605 return 0;
1606}
1607early_param("acpi", parse_acpi);
1608
1609/* FIXME: Using pci= for an ACPI parameter is a travesty. */
1610static int __init parse_pci(char *arg)
1611{
1612 if (arg && strcmp(arg, "noacpi") == 0)
1613 acpi_disable_pci();
1614 return 0;
1615}
1616early_param("pci", parse_pci);
1617
1618int __init acpi_mps_check(void)
1619{
1620#if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1621/* mptable code is not built-in*/
1622 if (acpi_disabled || acpi_noirq) {
1623 printk(KERN_WARNING "MPS support code is not built-in.\n"
1624 "Using acpi=off or acpi=noirq or pci=noacpi "
1625 "may have problem\n");
1626 return 1;
1627 }
1628#endif
1629 return 0;
1630}
1631
1632#ifdef CONFIG_X86_IO_APIC
1633static int __init parse_acpi_skip_timer_override(char *arg)
1634{
1635 acpi_skip_timer_override = 1;
1636 return 0;
1637}
1638early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1639
1640static int __init parse_acpi_use_timer_override(char *arg)
1641{
1642 acpi_use_timer_override = 1;
1643 return 0;
1644}
1645early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1646#endif /* CONFIG_X86_IO_APIC */
1647
1648static int __init setup_acpi_sci(char *s)
1649{
1650 if (!s)
1651 return -EINVAL;
1652 if (!strcmp(s, "edge"))
1653 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1654 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1655 else if (!strcmp(s, "level"))
1656 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1657 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1658 else if (!strcmp(s, "high"))
1659 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1660 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1661 else if (!strcmp(s, "low"))
1662 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1663 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1664 else
1665 return -EINVAL;
1666 return 0;
1667}
1668early_param("acpi_sci", setup_acpi_sci);
1669
1670int __acpi_acquire_global_lock(unsigned int *lock)
1671{
1672 unsigned int old, new, val;
1673 do {
1674 old = *lock;
1675 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1676 val = cmpxchg(lock, old, new);
1677 } while (unlikely (val != old));
1678 return (new < 3) ? -1 : 0;
1679}
1680
1681int __acpi_release_global_lock(unsigned int *lock)
1682{
1683 unsigned int old, new, val;
1684 do {
1685 old = *lock;
1686 new = old & ~0x3;
1687 val = cmpxchg(lock, old, new);
1688 } while (unlikely (val != old));
1689 return old & 0x1;
1690}