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x86: fix APIC warning on 32bit v2
[deliverable/linux.git] / arch / x86 / kernel / acpi / boot.c
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/bootmem.h>
35 #include <linux/ioport.h>
36
37 #include <asm/pgtable.h>
38 #include <asm/io_apic.h>
39 #include <asm/apic.h>
40 #include <asm/io.h>
41 #include <asm/mpspec.h>
42 #include <asm/smp.h>
43
44 #ifdef CONFIG_X86_LOCAL_APIC
45 # include <mach_apic.h>
46 #endif
47
48 static int __initdata acpi_force = 0;
49
50 #ifdef CONFIG_ACPI
51 int acpi_disabled = 0;
52 #else
53 int acpi_disabled = 1;
54 #endif
55 EXPORT_SYMBOL(acpi_disabled);
56
57 #ifdef CONFIG_X86_64
58
59 #include <asm/proto.h>
60 #include <asm/genapic.h>
61
62 #else /* X86 */
63
64 #ifdef CONFIG_X86_LOCAL_APIC
65 #include <mach_apic.h>
66 #include <mach_mpparse.h>
67 #endif /* CONFIG_X86_LOCAL_APIC */
68
69 #endif /* X86 */
70
71 #define BAD_MADT_ENTRY(entry, end) ( \
72 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
73 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
74
75 #define PREFIX "ACPI: "
76
77 int acpi_noirq; /* skip ACPI IRQ initialization */
78 int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
79 EXPORT_SYMBOL(acpi_pci_disabled);
80 int acpi_ht __initdata = 1; /* enable HT */
81
82 int acpi_lapic;
83 int acpi_ioapic;
84 int acpi_strict;
85
86 u8 acpi_sci_flags __initdata;
87 int acpi_sci_override_gsi __initdata;
88 int acpi_skip_timer_override __initdata;
89 int acpi_use_timer_override __initdata;
90
91 #ifdef CONFIG_X86_LOCAL_APIC
92 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
93 #endif
94
95 #ifndef __HAVE_ARCH_CMPXCHG
96 #warning ACPI uses CMPXCHG, i486 and later hardware
97 #endif
98
99 /* --------------------------------------------------------------------------
100 Boot-time Configuration
101 -------------------------------------------------------------------------- */
102
103 /*
104 * The default interrupt routing model is PIC (8259). This gets
105 * overridden if IOAPICs are enumerated (below).
106 */
107 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
108
109 #ifdef CONFIG_X86_64
110
111 /* rely on all ACPI tables being in the direct mapping */
112 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
113 {
114 if (!phys_addr || !size)
115 return NULL;
116
117 if (phys_addr+size <= (max_pfn_mapped << PAGE_SHIFT) + PAGE_SIZE)
118 return __va(phys_addr);
119
120 return NULL;
121 }
122
123 #else
124
125 /*
126 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
127 * to map the target physical address. The problem is that set_fixmap()
128 * provides a single page, and it is possible that the page is not
129 * sufficient.
130 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
131 * i.e. until the next __va_range() call.
132 *
133 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
134 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
135 * count idx down while incrementing the phys address.
136 */
137 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
138 {
139 unsigned long base, offset, mapped_size;
140 int idx;
141
142 if (phys + size < 8 * 1024 * 1024)
143 return __va(phys);
144
145 offset = phys & (PAGE_SIZE - 1);
146 mapped_size = PAGE_SIZE - offset;
147 set_fixmap(FIX_ACPI_END, phys);
148 base = fix_to_virt(FIX_ACPI_END);
149
150 /*
151 * Most cases can be covered by the below.
152 */
153 idx = FIX_ACPI_END;
154 while (mapped_size < size) {
155 if (--idx < FIX_ACPI_BEGIN)
156 return NULL; /* cannot handle this */
157 phys += PAGE_SIZE;
158 set_fixmap(idx, phys);
159 mapped_size += PAGE_SIZE;
160 }
161
162 return ((unsigned char *)base + offset);
163 }
164 #endif
165
166 #ifdef CONFIG_PCI_MMCONFIG
167 /* The physical address of the MMCONFIG aperture. Set from ACPI tables. */
168 struct acpi_mcfg_allocation *pci_mmcfg_config;
169 int pci_mmcfg_config_num;
170
171 int __init acpi_parse_mcfg(struct acpi_table_header *header)
172 {
173 struct acpi_table_mcfg *mcfg;
174 unsigned long i;
175 int config_size;
176
177 if (!header)
178 return -EINVAL;
179
180 mcfg = (struct acpi_table_mcfg *)header;
181
182 /* how many config structures do we have */
183 pci_mmcfg_config_num = 0;
184 i = header->length - sizeof(struct acpi_table_mcfg);
185 while (i >= sizeof(struct acpi_mcfg_allocation)) {
186 ++pci_mmcfg_config_num;
187 i -= sizeof(struct acpi_mcfg_allocation);
188 };
189 if (pci_mmcfg_config_num == 0) {
190 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
191 return -ENODEV;
192 }
193
194 config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
195 pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
196 if (!pci_mmcfg_config) {
197 printk(KERN_WARNING PREFIX
198 "No memory for MCFG config tables\n");
199 return -ENOMEM;
200 }
201
202 memcpy(pci_mmcfg_config, &mcfg[1], config_size);
203 for (i = 0; i < pci_mmcfg_config_num; ++i) {
204 if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
205 printk(KERN_ERR PREFIX
206 "MMCONFIG not in low 4GB of memory\n");
207 kfree(pci_mmcfg_config);
208 pci_mmcfg_config_num = 0;
209 return -ENODEV;
210 }
211 }
212
213 return 0;
214 }
215 #endif /* CONFIG_PCI_MMCONFIG */
216
217 #ifdef CONFIG_X86_LOCAL_APIC
218 static int __init acpi_parse_madt(struct acpi_table_header *table)
219 {
220 struct acpi_table_madt *madt = NULL;
221
222 if (!cpu_has_apic)
223 return -EINVAL;
224
225 madt = (struct acpi_table_madt *)table;
226 if (!madt) {
227 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
228 return -ENODEV;
229 }
230
231 if (madt->address) {
232 acpi_lapic_addr = (u64) madt->address;
233
234 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
235 madt->address);
236 }
237
238 acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
239
240 return 0;
241 }
242
243 static void __cpuinit acpi_register_lapic(int id, u8 enabled)
244 {
245 unsigned int ver = 0;
246
247 if (!enabled) {
248 ++disabled_cpus;
249 return;
250 }
251
252 #ifdef CONFIG_X86_32
253 if (boot_cpu_physical_apicid != -1U)
254 ver = apic_version[boot_cpu_physical_apicid];
255 #endif
256
257 generic_processor_info(id, ver);
258 }
259
260 static int __init
261 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
262 {
263 struct acpi_madt_local_apic *processor = NULL;
264
265 processor = (struct acpi_madt_local_apic *)header;
266
267 if (BAD_MADT_ENTRY(processor, end))
268 return -EINVAL;
269
270 acpi_table_print_madt_entry(header);
271
272 /*
273 * We need to register disabled CPU as well to permit
274 * counting disabled CPUs. This allows us to size
275 * cpus_possible_map more accurately, to permit
276 * to not preallocating memory for all NR_CPUS
277 * when we use CPU hotplug.
278 */
279 acpi_register_lapic(processor->id, /* APIC ID */
280 processor->lapic_flags & ACPI_MADT_ENABLED);
281
282 return 0;
283 }
284
285 static int __init
286 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
287 {
288 struct acpi_madt_local_sapic *processor = NULL;
289
290 processor = (struct acpi_madt_local_sapic *)header;
291
292 if (BAD_MADT_ENTRY(processor, end))
293 return -EINVAL;
294
295 acpi_table_print_madt_entry(header);
296
297 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
298 processor->lapic_flags & ACPI_MADT_ENABLED);
299
300 return 0;
301 }
302
303 static int __init
304 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
305 const unsigned long end)
306 {
307 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
308
309 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
310
311 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
312 return -EINVAL;
313
314 acpi_lapic_addr = lapic_addr_ovr->address;
315
316 return 0;
317 }
318
319 static int __init
320 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
321 {
322 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
323
324 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
325
326 if (BAD_MADT_ENTRY(lapic_nmi, end))
327 return -EINVAL;
328
329 acpi_table_print_madt_entry(header);
330
331 if (lapic_nmi->lint != 1)
332 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
333
334 return 0;
335 }
336
337 #endif /*CONFIG_X86_LOCAL_APIC */
338
339 #ifdef CONFIG_X86_IO_APIC
340
341 struct mp_ioapic_routing mp_ioapic_routing[MAX_IO_APICS];
342
343 static int __init
344 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
345 {
346 struct acpi_madt_io_apic *ioapic = NULL;
347
348 ioapic = (struct acpi_madt_io_apic *)header;
349
350 if (BAD_MADT_ENTRY(ioapic, end))
351 return -EINVAL;
352
353 acpi_table_print_madt_entry(header);
354
355 mp_register_ioapic(ioapic->id,
356 ioapic->address, ioapic->global_irq_base);
357
358 return 0;
359 }
360
361 /*
362 * Parse Interrupt Source Override for the ACPI SCI
363 */
364 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
365 {
366 if (trigger == 0) /* compatible SCI trigger is level */
367 trigger = 3;
368
369 if (polarity == 0) /* compatible SCI polarity is low */
370 polarity = 3;
371
372 /* Command-line over-ride via acpi_sci= */
373 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
374 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
375
376 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
377 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
378
379 /*
380 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
381 * If GSI is < 16, this will update its flags,
382 * else it will create a new mp_irqs[] entry.
383 */
384 mp_override_legacy_irq(gsi, polarity, trigger, gsi);
385
386 /*
387 * stash over-ride to indicate we've been here
388 * and for later update of acpi_gbl_FADT
389 */
390 acpi_sci_override_gsi = gsi;
391 return;
392 }
393
394 static int __init
395 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
396 const unsigned long end)
397 {
398 struct acpi_madt_interrupt_override *intsrc = NULL;
399
400 intsrc = (struct acpi_madt_interrupt_override *)header;
401
402 if (BAD_MADT_ENTRY(intsrc, end))
403 return -EINVAL;
404
405 acpi_table_print_madt_entry(header);
406
407 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
408 acpi_sci_ioapic_setup(intsrc->global_irq,
409 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
410 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
411 return 0;
412 }
413
414 if (acpi_skip_timer_override &&
415 intsrc->source_irq == 0 && intsrc->global_irq == 2) {
416 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
417 return 0;
418 }
419
420 mp_override_legacy_irq(intsrc->source_irq,
421 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
422 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
423 intsrc->global_irq);
424
425 return 0;
426 }
427
428 static int __init
429 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
430 {
431 struct acpi_madt_nmi_source *nmi_src = NULL;
432
433 nmi_src = (struct acpi_madt_nmi_source *)header;
434
435 if (BAD_MADT_ENTRY(nmi_src, end))
436 return -EINVAL;
437
438 acpi_table_print_madt_entry(header);
439
440 /* TBD: Support nimsrc entries? */
441
442 return 0;
443 }
444
445 #endif /* CONFIG_X86_IO_APIC */
446
447 /*
448 * acpi_pic_sci_set_trigger()
449 *
450 * use ELCR to set PIC-mode trigger type for SCI
451 *
452 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
453 * it may require Edge Trigger -- use "acpi_sci=edge"
454 *
455 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
456 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
457 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
458 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
459 */
460
461 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
462 {
463 unsigned int mask = 1 << irq;
464 unsigned int old, new;
465
466 /* Real old ELCR mask */
467 old = inb(0x4d0) | (inb(0x4d1) << 8);
468
469 /*
470 * If we use ACPI to set PCI IRQs, then we should clear ELCR
471 * since we will set it correctly as we enable the PCI irq
472 * routing.
473 */
474 new = acpi_noirq ? old : 0;
475
476 /*
477 * Update SCI information in the ELCR, it isn't in the PCI
478 * routing tables..
479 */
480 switch (trigger) {
481 case 1: /* Edge - clear */
482 new &= ~mask;
483 break;
484 case 3: /* Level - set */
485 new |= mask;
486 break;
487 }
488
489 if (old == new)
490 return;
491
492 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
493 outb(new, 0x4d0);
494 outb(new >> 8, 0x4d1);
495 }
496
497 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
498 {
499 *irq = gsi;
500 return 0;
501 }
502
503 /*
504 * success: return IRQ number (>=0)
505 * failure: return < 0
506 */
507 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
508 {
509 unsigned int irq;
510 unsigned int plat_gsi = gsi;
511
512 #ifdef CONFIG_PCI
513 /*
514 * Make sure all (legacy) PCI IRQs are set as level-triggered.
515 */
516 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
517 extern void eisa_set_level_irq(unsigned int irq);
518
519 if (triggering == ACPI_LEVEL_SENSITIVE)
520 eisa_set_level_irq(gsi);
521 }
522 #endif
523
524 #ifdef CONFIG_X86_IO_APIC
525 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
526 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
527 }
528 #endif
529 acpi_gsi_to_irq(plat_gsi, &irq);
530 return irq;
531 }
532
533 /*
534 * ACPI based hotplug support for CPU
535 */
536 #ifdef CONFIG_ACPI_HOTPLUG_CPU
537
538 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
539 {
540 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
541 union acpi_object *obj;
542 struct acpi_madt_local_apic *lapic;
543 cpumask_t tmp_map, new_map;
544 u8 physid;
545 int cpu;
546
547 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
548 return -EINVAL;
549
550 if (!buffer.length || !buffer.pointer)
551 return -EINVAL;
552
553 obj = buffer.pointer;
554 if (obj->type != ACPI_TYPE_BUFFER ||
555 obj->buffer.length < sizeof(*lapic)) {
556 kfree(buffer.pointer);
557 return -EINVAL;
558 }
559
560 lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
561
562 if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
563 !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
564 kfree(buffer.pointer);
565 return -EINVAL;
566 }
567
568 physid = lapic->id;
569
570 kfree(buffer.pointer);
571 buffer.length = ACPI_ALLOCATE_BUFFER;
572 buffer.pointer = NULL;
573
574 tmp_map = cpu_present_map;
575 acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
576
577 /*
578 * If mp_register_lapic successfully generates a new logical cpu
579 * number, then the following will get us exactly what was mapped
580 */
581 cpus_andnot(new_map, cpu_present_map, tmp_map);
582 if (cpus_empty(new_map)) {
583 printk ("Unable to map lapic to logical cpu number\n");
584 return -EINVAL;
585 }
586
587 cpu = first_cpu(new_map);
588
589 *pcpu = cpu;
590 return 0;
591 }
592
593 /* wrapper to silence section mismatch warning */
594 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
595 {
596 return _acpi_map_lsapic(handle, pcpu);
597 }
598 EXPORT_SYMBOL(acpi_map_lsapic);
599
600 int acpi_unmap_lsapic(int cpu)
601 {
602 per_cpu(x86_cpu_to_apicid, cpu) = -1;
603 cpu_clear(cpu, cpu_present_map);
604 num_processors--;
605
606 return (0);
607 }
608
609 EXPORT_SYMBOL(acpi_unmap_lsapic);
610 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
611
612 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
613 {
614 /* TBD */
615 return -EINVAL;
616 }
617
618 EXPORT_SYMBOL(acpi_register_ioapic);
619
620 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
621 {
622 /* TBD */
623 return -EINVAL;
624 }
625
626 EXPORT_SYMBOL(acpi_unregister_ioapic);
627
628 static int __init acpi_parse_sbf(struct acpi_table_header *table)
629 {
630 struct acpi_table_boot *sb;
631
632 sb = (struct acpi_table_boot *)table;
633 if (!sb) {
634 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
635 return -ENODEV;
636 }
637
638 sbf_port = sb->cmos_index; /* Save CMOS port */
639
640 return 0;
641 }
642
643 #ifdef CONFIG_HPET_TIMER
644 #include <asm/hpet.h>
645
646 static struct __initdata resource *hpet_res;
647
648 static int __init acpi_parse_hpet(struct acpi_table_header *table)
649 {
650 struct acpi_table_hpet *hpet_tbl;
651
652 hpet_tbl = (struct acpi_table_hpet *)table;
653 if (!hpet_tbl) {
654 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
655 return -ENODEV;
656 }
657
658 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
659 printk(KERN_WARNING PREFIX "HPET timers must be located in "
660 "memory.\n");
661 return -1;
662 }
663
664 hpet_address = hpet_tbl->address.address;
665
666 /*
667 * Some broken BIOSes advertise HPET at 0x0. We really do not
668 * want to allocate a resource there.
669 */
670 if (!hpet_address) {
671 printk(KERN_WARNING PREFIX
672 "HPET id: %#x base: %#lx is invalid\n",
673 hpet_tbl->id, hpet_address);
674 return 0;
675 }
676 #ifdef CONFIG_X86_64
677 /*
678 * Some even more broken BIOSes advertise HPET at
679 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
680 * some noise:
681 */
682 if (hpet_address == 0xfed0000000000000UL) {
683 if (!hpet_force_user) {
684 printk(KERN_WARNING PREFIX "HPET id: %#x "
685 "base: 0xfed0000000000000 is bogus\n "
686 "try hpet=force on the kernel command line to "
687 "fix it up to 0xfed00000.\n", hpet_tbl->id);
688 hpet_address = 0;
689 return 0;
690 }
691 printk(KERN_WARNING PREFIX
692 "HPET id: %#x base: 0xfed0000000000000 fixed up "
693 "to 0xfed00000.\n", hpet_tbl->id);
694 hpet_address >>= 32;
695 }
696 #endif
697 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
698 hpet_tbl->id, hpet_address);
699
700 /*
701 * Allocate and initialize the HPET firmware resource for adding into
702 * the resource tree during the lateinit timeframe.
703 */
704 #define HPET_RESOURCE_NAME_SIZE 9
705 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
706
707 hpet_res->name = (void *)&hpet_res[1];
708 hpet_res->flags = IORESOURCE_MEM;
709 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
710 hpet_tbl->sequence);
711
712 hpet_res->start = hpet_address;
713 hpet_res->end = hpet_address + (1 * 1024) - 1;
714
715 return 0;
716 }
717
718 /*
719 * hpet_insert_resource inserts the HPET resources used into the resource
720 * tree.
721 */
722 static __init int hpet_insert_resource(void)
723 {
724 if (!hpet_res)
725 return 1;
726
727 return insert_resource(&iomem_resource, hpet_res);
728 }
729
730 late_initcall(hpet_insert_resource);
731
732 #else
733 #define acpi_parse_hpet NULL
734 #endif
735
736 static int __init acpi_parse_fadt(struct acpi_table_header *table)
737 {
738
739 #ifdef CONFIG_X86_PM_TIMER
740 /* detect the location of the ACPI PM Timer */
741 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
742 /* FADT rev. 2 */
743 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
744 ACPI_ADR_SPACE_SYSTEM_IO)
745 return 0;
746
747 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
748 /*
749 * "X" fields are optional extensions to the original V1.0
750 * fields, so we must selectively expand V1.0 fields if the
751 * corresponding X field is zero.
752 */
753 if (!pmtmr_ioport)
754 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
755 } else {
756 /* FADT rev. 1 */
757 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
758 }
759 if (pmtmr_ioport)
760 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
761 pmtmr_ioport);
762 #endif
763 return 0;
764 }
765
766 #ifdef CONFIG_X86_LOCAL_APIC
767 /*
768 * Parse LAPIC entries in MADT
769 * returns 0 on success, < 0 on error
770 */
771
772 static void __init acpi_register_lapic_address(unsigned long address)
773 {
774 mp_lapic_addr = address;
775
776 set_fixmap_nocache(FIX_APIC_BASE, address);
777 if (boot_cpu_physical_apicid == -1U) {
778 boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
779 #ifdef CONFIG_X86_32
780 apic_version[boot_cpu_physical_apicid] =
781 GET_APIC_VERSION(apic_read(APIC_LVR));
782 #endif
783 }
784 }
785
786 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
787 {
788 int count;
789
790 if (!cpu_has_apic)
791 return -ENODEV;
792
793 /*
794 * Note that the LAPIC address is obtained from the MADT (32-bit value)
795 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
796 */
797
798 count =
799 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
800 acpi_parse_lapic_addr_ovr, 0);
801 if (count < 0) {
802 printk(KERN_ERR PREFIX
803 "Error parsing LAPIC address override entry\n");
804 return count;
805 }
806
807 acpi_register_lapic_address(acpi_lapic_addr);
808
809 return count;
810 }
811
812 static int __init acpi_parse_madt_lapic_entries(void)
813 {
814 int count;
815
816 if (!cpu_has_apic)
817 return -ENODEV;
818
819 /*
820 * Note that the LAPIC address is obtained from the MADT (32-bit value)
821 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
822 */
823
824 count =
825 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
826 acpi_parse_lapic_addr_ovr, 0);
827 if (count < 0) {
828 printk(KERN_ERR PREFIX
829 "Error parsing LAPIC address override entry\n");
830 return count;
831 }
832
833 acpi_register_lapic_address(acpi_lapic_addr);
834
835 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
836 acpi_parse_sapic, MAX_APICS);
837
838 if (!count)
839 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
840 acpi_parse_lapic, MAX_APICS);
841 if (!count) {
842 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
843 /* TBD: Cleanup to allow fallback to MPS */
844 return -ENODEV;
845 } else if (count < 0) {
846 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
847 /* TBD: Cleanup to allow fallback to MPS */
848 return count;
849 }
850
851 count =
852 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
853 if (count < 0) {
854 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
855 /* TBD: Cleanup to allow fallback to MPS */
856 return count;
857 }
858 return 0;
859 }
860 #endif /* CONFIG_X86_LOCAL_APIC */
861
862 #ifdef CONFIG_X86_IO_APIC
863 /*
864 * Parse IOAPIC related entries in MADT
865 * returns 0 on success, < 0 on error
866 */
867 static int __init acpi_parse_madt_ioapic_entries(void)
868 {
869 int count;
870
871 /*
872 * ACPI interpreter is required to complete interrupt setup,
873 * so if it is off, don't enumerate the io-apics with ACPI.
874 * If MPS is present, it will handle them,
875 * otherwise the system will stay in PIC mode
876 */
877 if (acpi_disabled || acpi_noirq) {
878 return -ENODEV;
879 }
880
881 if (!cpu_has_apic)
882 return -ENODEV;
883
884 /*
885 * if "noapic" boot option, don't look for IO-APICs
886 */
887 if (skip_ioapic_setup) {
888 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
889 "due to 'noapic' option.\n");
890 return -ENODEV;
891 }
892
893 count =
894 acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
895 MAX_IO_APICS);
896 if (!count) {
897 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
898 return -ENODEV;
899 } else if (count < 0) {
900 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
901 return count;
902 }
903
904 count =
905 acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
906 NR_IRQ_VECTORS);
907 if (count < 0) {
908 printk(KERN_ERR PREFIX
909 "Error parsing interrupt source overrides entry\n");
910 /* TBD: Cleanup to allow fallback to MPS */
911 return count;
912 }
913
914 /*
915 * If BIOS did not supply an INT_SRC_OVR for the SCI
916 * pretend we got one so we can set the SCI flags.
917 */
918 if (!acpi_sci_override_gsi)
919 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
920
921 /* Fill in identity legacy mapings where no override */
922 mp_config_acpi_legacy_irqs();
923
924 count =
925 acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
926 NR_IRQ_VECTORS);
927 if (count < 0) {
928 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
929 /* TBD: Cleanup to allow fallback to MPS */
930 return count;
931 }
932
933 return 0;
934 }
935 #else
936 static inline int acpi_parse_madt_ioapic_entries(void)
937 {
938 return -1;
939 }
940 #endif /* !CONFIG_X86_IO_APIC */
941
942 static void __init early_acpi_process_madt(void)
943 {
944 #ifdef CONFIG_X86_LOCAL_APIC
945 int error;
946
947 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
948
949 /*
950 * Parse MADT LAPIC entries
951 */
952 error = early_acpi_parse_madt_lapic_addr_ovr();
953 if (!error) {
954 acpi_lapic = 1;
955 smp_found_config = 1;
956 }
957 if (error == -EINVAL) {
958 /*
959 * Dell Precision Workstation 410, 610 come here.
960 */
961 printk(KERN_ERR PREFIX
962 "Invalid BIOS MADT, disabling ACPI\n");
963 disable_acpi();
964 }
965 }
966 #endif
967 }
968
969 static void __init acpi_process_madt(void)
970 {
971 #ifdef CONFIG_X86_LOCAL_APIC
972 int error;
973
974 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
975
976 /*
977 * Parse MADT LAPIC entries
978 */
979 error = acpi_parse_madt_lapic_entries();
980 if (!error) {
981 acpi_lapic = 1;
982
983 #ifdef CONFIG_X86_GENERICARCH
984 generic_bigsmp_probe();
985 #endif
986 /*
987 * Parse MADT IO-APIC entries
988 */
989 error = acpi_parse_madt_ioapic_entries();
990 if (!error) {
991 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
992 acpi_irq_balance_set(NULL);
993 acpi_ioapic = 1;
994
995 smp_found_config = 1;
996 setup_apic_routing();
997 }
998 }
999 if (error == -EINVAL) {
1000 /*
1001 * Dell Precision Workstation 410, 610 come here.
1002 */
1003 printk(KERN_ERR PREFIX
1004 "Invalid BIOS MADT, disabling ACPI\n");
1005 disable_acpi();
1006 }
1007 }
1008 #endif
1009 return;
1010 }
1011
1012 #ifdef __i386__
1013
1014 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1015 {
1016 if (!acpi_force) {
1017 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1018 d->ident);
1019 acpi_noirq_set();
1020 }
1021 return 0;
1022 }
1023
1024 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1025 {
1026 if (!acpi_force) {
1027 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1028 d->ident);
1029 acpi_disable_pci();
1030 }
1031 return 0;
1032 }
1033
1034 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1035 {
1036 if (!acpi_force) {
1037 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1038 disable_acpi();
1039 } else {
1040 printk(KERN_NOTICE
1041 "Warning: DMI blacklist says broken, but acpi forced\n");
1042 }
1043 return 0;
1044 }
1045
1046 /*
1047 * Limit ACPI to CPU enumeration for HT
1048 */
1049 static int __init force_acpi_ht(const struct dmi_system_id *d)
1050 {
1051 if (!acpi_force) {
1052 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
1053 d->ident);
1054 disable_acpi();
1055 acpi_ht = 1;
1056 } else {
1057 printk(KERN_NOTICE
1058 "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
1059 }
1060 return 0;
1061 }
1062
1063 /*
1064 * If your system is blacklisted here, but you find that acpi=force
1065 * works for you, please contact acpi-devel@sourceforge.net
1066 */
1067 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1068 /*
1069 * Boxes that need ACPI disabled
1070 */
1071 {
1072 .callback = dmi_disable_acpi,
1073 .ident = "IBM Thinkpad",
1074 .matches = {
1075 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1076 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1077 },
1078 },
1079
1080 /*
1081 * Boxes that need acpi=ht
1082 */
1083 {
1084 .callback = force_acpi_ht,
1085 .ident = "FSC Primergy T850",
1086 .matches = {
1087 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1088 DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1089 },
1090 },
1091 {
1092 .callback = force_acpi_ht,
1093 .ident = "HP VISUALIZE NT Workstation",
1094 .matches = {
1095 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1096 DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1097 },
1098 },
1099 {
1100 .callback = force_acpi_ht,
1101 .ident = "Compaq Workstation W8000",
1102 .matches = {
1103 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1104 DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1105 },
1106 },
1107 {
1108 .callback = force_acpi_ht,
1109 .ident = "ASUS P4B266",
1110 .matches = {
1111 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1112 DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1113 },
1114 },
1115 {
1116 .callback = force_acpi_ht,
1117 .ident = "ASUS P2B-DS",
1118 .matches = {
1119 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1120 DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1121 },
1122 },
1123 {
1124 .callback = force_acpi_ht,
1125 .ident = "ASUS CUR-DLS",
1126 .matches = {
1127 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1128 DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1129 },
1130 },
1131 {
1132 .callback = force_acpi_ht,
1133 .ident = "ABIT i440BX-W83977",
1134 .matches = {
1135 DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1136 DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1137 },
1138 },
1139 {
1140 .callback = force_acpi_ht,
1141 .ident = "IBM Bladecenter",
1142 .matches = {
1143 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1144 DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1145 },
1146 },
1147 {
1148 .callback = force_acpi_ht,
1149 .ident = "IBM eServer xSeries 360",
1150 .matches = {
1151 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1152 DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1153 },
1154 },
1155 {
1156 .callback = force_acpi_ht,
1157 .ident = "IBM eserver xSeries 330",
1158 .matches = {
1159 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1160 DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1161 },
1162 },
1163 {
1164 .callback = force_acpi_ht,
1165 .ident = "IBM eserver xSeries 440",
1166 .matches = {
1167 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1168 DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1169 },
1170 },
1171
1172 /*
1173 * Boxes that need ACPI PCI IRQ routing disabled
1174 */
1175 {
1176 .callback = disable_acpi_irq,
1177 .ident = "ASUS A7V",
1178 .matches = {
1179 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1180 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1181 /* newer BIOS, Revision 1011, does work */
1182 DMI_MATCH(DMI_BIOS_VERSION,
1183 "ASUS A7V ACPI BIOS Revision 1007"),
1184 },
1185 },
1186 {
1187 /*
1188 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1189 * for LPC bridge, which is needed for the PCI
1190 * interrupt links to work. DSDT fix is in bug 5966.
1191 * 2645, 2646 model numbers are shared with 600/600E/600X
1192 */
1193 .callback = disable_acpi_irq,
1194 .ident = "IBM Thinkpad 600 Series 2645",
1195 .matches = {
1196 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1197 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1198 },
1199 },
1200 {
1201 .callback = disable_acpi_irq,
1202 .ident = "IBM Thinkpad 600 Series 2646",
1203 .matches = {
1204 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1205 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1206 },
1207 },
1208 /*
1209 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1210 */
1211 { /* _BBN 0 bug */
1212 .callback = disable_acpi_pci,
1213 .ident = "ASUS PR-DLS",
1214 .matches = {
1215 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1216 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1217 DMI_MATCH(DMI_BIOS_VERSION,
1218 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1219 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1220 },
1221 },
1222 {
1223 .callback = disable_acpi_pci,
1224 .ident = "Acer TravelMate 36x Laptop",
1225 .matches = {
1226 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1227 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1228 },
1229 },
1230 {}
1231 };
1232
1233 #endif /* __i386__ */
1234
1235 /*
1236 * acpi_boot_table_init() and acpi_boot_init()
1237 * called from setup_arch(), always.
1238 * 1. checksums all tables
1239 * 2. enumerates lapics
1240 * 3. enumerates io-apics
1241 *
1242 * acpi_table_init() is separate to allow reading SRAT without
1243 * other side effects.
1244 *
1245 * side effects of acpi_boot_init:
1246 * acpi_lapic = 1 if LAPIC found
1247 * acpi_ioapic = 1 if IOAPIC found
1248 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1249 * if acpi_blacklisted() acpi_disabled = 1;
1250 * acpi_irq_model=...
1251 * ...
1252 *
1253 * return value: (currently ignored)
1254 * 0: success
1255 * !0: failure
1256 */
1257
1258 int __init acpi_boot_table_init(void)
1259 {
1260 int error;
1261
1262 #ifdef __i386__
1263 dmi_check_system(acpi_dmi_table);
1264 #endif
1265
1266 /*
1267 * If acpi_disabled, bail out
1268 * One exception: acpi=ht continues far enough to enumerate LAPICs
1269 */
1270 if (acpi_disabled && !acpi_ht)
1271 return 1;
1272
1273 /*
1274 * Initialize the ACPI boot-time table parser.
1275 */
1276 error = acpi_table_init();
1277 if (error) {
1278 disable_acpi();
1279 return error;
1280 }
1281
1282 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1283
1284 /*
1285 * blacklist may disable ACPI entirely
1286 */
1287 error = acpi_blacklisted();
1288 if (error) {
1289 if (acpi_force) {
1290 printk(KERN_WARNING PREFIX "acpi=force override\n");
1291 } else {
1292 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1293 disable_acpi();
1294 return error;
1295 }
1296 }
1297
1298 return 0;
1299 }
1300
1301 int __init early_acpi_boot_init(void)
1302 {
1303 /*
1304 * If acpi_disabled, bail out
1305 * One exception: acpi=ht continues far enough to enumerate LAPICs
1306 */
1307 if (acpi_disabled && !acpi_ht)
1308 return 1;
1309
1310 /*
1311 * Process the Multiple APIC Description Table (MADT), if present
1312 */
1313 early_acpi_process_madt();
1314
1315 return 0;
1316 }
1317
1318 int __init acpi_boot_init(void)
1319 {
1320 /*
1321 * If acpi_disabled, bail out
1322 * One exception: acpi=ht continues far enough to enumerate LAPICs
1323 */
1324 if (acpi_disabled && !acpi_ht)
1325 return 1;
1326
1327 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1328
1329 /*
1330 * set sci_int and PM timer address
1331 */
1332 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1333
1334 /*
1335 * Process the Multiple APIC Description Table (MADT), if present
1336 */
1337 acpi_process_madt();
1338
1339 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1340
1341 return 0;
1342 }
1343
1344 static int __init parse_acpi(char *arg)
1345 {
1346 if (!arg)
1347 return -EINVAL;
1348
1349 /* "acpi=off" disables both ACPI table parsing and interpreter */
1350 if (strcmp(arg, "off") == 0) {
1351 disable_acpi();
1352 }
1353 /* acpi=force to over-ride black-list */
1354 else if (strcmp(arg, "force") == 0) {
1355 acpi_force = 1;
1356 acpi_ht = 1;
1357 acpi_disabled = 0;
1358 }
1359 /* acpi=strict disables out-of-spec workarounds */
1360 else if (strcmp(arg, "strict") == 0) {
1361 acpi_strict = 1;
1362 }
1363 /* Limit ACPI just to boot-time to enable HT */
1364 else if (strcmp(arg, "ht") == 0) {
1365 if (!acpi_force)
1366 disable_acpi();
1367 acpi_ht = 1;
1368 }
1369 /* "acpi=noirq" disables ACPI interrupt routing */
1370 else if (strcmp(arg, "noirq") == 0) {
1371 acpi_noirq_set();
1372 } else {
1373 /* Core will printk when we return error. */
1374 return -EINVAL;
1375 }
1376 return 0;
1377 }
1378 early_param("acpi", parse_acpi);
1379
1380 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1381 static int __init parse_pci(char *arg)
1382 {
1383 if (arg && strcmp(arg, "noacpi") == 0)
1384 acpi_disable_pci();
1385 return 0;
1386 }
1387 early_param("pci", parse_pci);
1388
1389 #ifdef CONFIG_X86_IO_APIC
1390 static int __init parse_acpi_skip_timer_override(char *arg)
1391 {
1392 acpi_skip_timer_override = 1;
1393 return 0;
1394 }
1395 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1396
1397 static int __init parse_acpi_use_timer_override(char *arg)
1398 {
1399 acpi_use_timer_override = 1;
1400 return 0;
1401 }
1402 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1403 #endif /* CONFIG_X86_IO_APIC */
1404
1405 static int __init setup_acpi_sci(char *s)
1406 {
1407 if (!s)
1408 return -EINVAL;
1409 if (!strcmp(s, "edge"))
1410 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1411 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1412 else if (!strcmp(s, "level"))
1413 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1414 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1415 else if (!strcmp(s, "high"))
1416 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1417 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1418 else if (!strcmp(s, "low"))
1419 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1420 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1421 else
1422 return -EINVAL;
1423 return 0;
1424 }
1425 early_param("acpi_sci", setup_acpi_sci);
1426
1427 int __acpi_acquire_global_lock(unsigned int *lock)
1428 {
1429 unsigned int old, new, val;
1430 do {
1431 old = *lock;
1432 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1433 val = cmpxchg(lock, old, new);
1434 } while (unlikely (val != old));
1435 return (new < 3) ? -1 : 0;
1436 }
1437
1438 int __acpi_release_global_lock(unsigned int *lock)
1439 {
1440 unsigned int old, new, val;
1441 do {
1442 old = *lock;
1443 new = old & ~0x3;
1444 val = cmpxchg(lock, old, new);
1445 } while (unlikely (val != old));
1446 return old & 0x1;
1447 }
Linux kernel - Deliverables
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