543eac5da176d06b3c43729bf0958cb5c3b15bb0
[linux-2.6.git] / arch / i386 / 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/efi.h>
29 #include <linux/cpumask.h>
30 #include <linux/module.h>
31 #include <linux/dmi.h>
32 #include <linux/irq.h>
33 #include <linux/bootmem.h>
34 #include <linux/ioport.h>
35
36 #include <asm/pgtable.h>
37 #include <asm/io_apic.h>
38 #include <asm/apic.h>
39 #include <asm/io.h>
40 #include <asm/mpspec.h>
41
42 static int __initdata acpi_force = 0;
43
44 #ifdef  CONFIG_ACPI
45 int acpi_disabled = 0;
46 #else
47 int acpi_disabled = 1;
48 #endif
49 EXPORT_SYMBOL(acpi_disabled);
50
51 #ifdef  CONFIG_X86_64
52
53 #include <asm/proto.h>
54
55 static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
56
57
58 #else                           /* X86 */
59
60 #ifdef  CONFIG_X86_LOCAL_APIC
61 #include <mach_apic.h>
62 #include <mach_mpparse.h>
63 #endif                          /* CONFIG_X86_LOCAL_APIC */
64
65 #endif                          /* X86 */
66
67 #define BAD_MADT_ENTRY(entry, end) (                                        \
68                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
69                 ((acpi_table_entry_header *)entry)->length < sizeof(*entry))
70
71 #define PREFIX                  "ACPI: "
72
73 int acpi_noirq;                         /* skip ACPI IRQ initialization */
74 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
75 int acpi_ht __initdata = 1;     /* enable HT */
76
77 int acpi_lapic;
78 int acpi_ioapic;
79 int acpi_strict;
80 EXPORT_SYMBOL(acpi_strict);
81
82 acpi_interrupt_flags acpi_sci_flags __initdata;
83 int acpi_sci_override_gsi __initdata;
84 int acpi_skip_timer_override __initdata;
85 int acpi_use_timer_override __initdata;
86
87 #ifdef CONFIG_X86_LOCAL_APIC
88 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
89 #endif
90
91 #ifndef __HAVE_ARCH_CMPXCHG
92 #warning ACPI uses CMPXCHG, i486 and later hardware
93 #endif
94
95 #define MAX_MADT_ENTRIES        256
96 u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
97     {[0 ... MAX_MADT_ENTRIES - 1] = 0xff };
98 EXPORT_SYMBOL(x86_acpiid_to_apicid);
99
100 /* --------------------------------------------------------------------------
101                               Boot-time Configuration
102    -------------------------------------------------------------------------- */
103
104 /*
105  * The default interrupt routing model is PIC (8259).  This gets
106  * overriden if IOAPICs are enumerated (below).
107  */
108 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
109
110 #ifdef  CONFIG_X86_64
111
112 /* rely on all ACPI tables being in the direct mapping */
113 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
114 {
115         if (!phys_addr || !size)
116                 return NULL;
117
118         if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
119                 return __va(phys_addr);
120
121         return NULL;
122 }
123
124 #else
125
126 /*
127  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
128  * to map the target physical address. The problem is that set_fixmap()
129  * provides a single page, and it is possible that the page is not
130  * sufficient.
131  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
132  * i.e. until the next __va_range() call.
133  *
134  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
135  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
136  * count idx down while incrementing the phys address.
137  */
138 char *__acpi_map_table(unsigned long phys, unsigned long size)
139 {
140         unsigned long base, offset, mapped_size;
141         int idx;
142
143         if (phys + size < 8 * 1024 * 1024)
144                 return __va(phys);
145
146         offset = phys & (PAGE_SIZE - 1);
147         mapped_size = PAGE_SIZE - offset;
148         set_fixmap(FIX_ACPI_END, phys);
149         base = fix_to_virt(FIX_ACPI_END);
150
151         /*
152          * Most cases can be covered by the below.
153          */
154         idx = FIX_ACPI_END;
155         while (mapped_size < size) {
156                 if (--idx < FIX_ACPI_BEGIN)
157                         return NULL;    /* cannot handle this */
158                 phys += PAGE_SIZE;
159                 set_fixmap(idx, phys);
160                 mapped_size += PAGE_SIZE;
161         }
162
163         return ((unsigned char *)base + offset);
164 }
165 #endif
166
167 #ifdef CONFIG_PCI_MMCONFIG
168 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
169 struct acpi_table_mcfg_config *pci_mmcfg_config;
170 int pci_mmcfg_config_num;
171
172 int __init acpi_parse_mcfg(struct acpi_table_header *header)
173 {
174         struct acpi_table_mcfg *mcfg;
175         unsigned long i;
176         int config_size;
177
178         if (!header)
179                 return -EINVAL;
180
181         mcfg = (struct acpi_table_mcfg *)header;
182         if (!mcfg) {
183                 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
184                 return -ENODEV;
185         }
186
187         /* how many config structures do we have */
188         pci_mmcfg_config_num = 0;
189         i = header->length - sizeof(struct acpi_table_mcfg);
190         while (i >= sizeof(struct acpi_table_mcfg_config)) {
191                 ++pci_mmcfg_config_num;
192                 i -= sizeof(struct acpi_table_mcfg_config);
193         };
194         if (pci_mmcfg_config_num == 0) {
195                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
196                 return -ENODEV;
197         }
198
199         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
200         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
201         if (!pci_mmcfg_config) {
202                 printk(KERN_WARNING PREFIX
203                        "No memory for MCFG config tables\n");
204                 return -ENOMEM;
205         }
206
207         memcpy(pci_mmcfg_config, &mcfg->config, config_size);
208         for (i = 0; i < pci_mmcfg_config_num; ++i) {
209                 if (mcfg->config[i].base_reserved) {
210                         printk(KERN_ERR PREFIX
211                                "MMCONFIG not in low 4GB of memory\n");
212                         kfree(pci_mmcfg_config);
213                         pci_mmcfg_config_num = 0;
214                         return -ENODEV;
215                 }
216         }
217
218         return 0;
219 }
220 #endif                          /* CONFIG_PCI_MMCONFIG */
221
222 #ifdef CONFIG_X86_LOCAL_APIC
223 static int __init acpi_parse_madt(struct acpi_table_header *header)
224 {
225         struct acpi_table_madt *madt = NULL;
226
227         if (!header|| !cpu_has_apic)
228                 return -EINVAL;
229
230         madt = (struct acpi_table_madt *)header;
231         if (!madt) {
232                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
233                 return -ENODEV;
234         }
235
236         if (madt->lapic_address) {
237                 acpi_lapic_addr = (u64) madt->lapic_address;
238
239                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
240                        madt->lapic_address);
241         }
242
243         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
244
245         return 0;
246 }
247
248 static int __init
249 acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
250 {
251         struct acpi_table_lapic *processor = NULL;
252
253         processor = (struct acpi_table_lapic *)header;
254
255         if (BAD_MADT_ENTRY(processor, end))
256                 return -EINVAL;
257
258         acpi_table_print_madt_entry(header);
259
260         /* Record local apic id only when enabled */
261         if (processor->flags.enabled)
262                 x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
263
264         /*
265          * We need to register disabled CPU as well to permit
266          * counting disabled CPUs. This allows us to size
267          * cpus_possible_map more accurately, to permit
268          * to not preallocating memory for all NR_CPUS
269          * when we use CPU hotplug.
270          */
271         mp_register_lapic(processor->id,        /* APIC ID */
272                           processor->flags.enabled);    /* Enabled? */
273
274         return 0;
275 }
276
277 static int __init
278 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
279                           const unsigned long end)
280 {
281         struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
282
283         lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr *)header;
284
285         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
286                 return -EINVAL;
287
288         acpi_lapic_addr = lapic_addr_ovr->address;
289
290         return 0;
291 }
292
293 static int __init
294 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
295 {
296         struct acpi_table_lapic_nmi *lapic_nmi = NULL;
297
298         lapic_nmi = (struct acpi_table_lapic_nmi *)header;
299
300         if (BAD_MADT_ENTRY(lapic_nmi, end))
301                 return -EINVAL;
302
303         acpi_table_print_madt_entry(header);
304
305         if (lapic_nmi->lint != 1)
306                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
307
308         return 0;
309 }
310
311 #endif                          /*CONFIG_X86_LOCAL_APIC */
312
313 #ifdef CONFIG_X86_IO_APIC
314
315 static int __init
316 acpi_parse_ioapic(acpi_table_entry_header * header, const unsigned long end)
317 {
318         struct acpi_table_ioapic *ioapic = NULL;
319
320         ioapic = (struct acpi_table_ioapic *)header;
321
322         if (BAD_MADT_ENTRY(ioapic, end))
323                 return -EINVAL;
324
325         acpi_table_print_madt_entry(header);
326
327         mp_register_ioapic(ioapic->id,
328                            ioapic->address, ioapic->global_irq_base);
329
330         return 0;
331 }
332
333 /*
334  * Parse Interrupt Source Override for the ACPI SCI
335  */
336 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
337 {
338         if (trigger == 0)       /* compatible SCI trigger is level */
339                 trigger = 3;
340
341         if (polarity == 0)      /* compatible SCI polarity is low */
342                 polarity = 3;
343
344         /* Command-line over-ride via acpi_sci= */
345         if (acpi_sci_flags.trigger)
346                 trigger = acpi_sci_flags.trigger;
347
348         if (acpi_sci_flags.polarity)
349                 polarity = acpi_sci_flags.polarity;
350
351         /*
352          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
353          * If GSI is < 16, this will update its flags,
354          * else it will create a new mp_irqs[] entry.
355          */
356         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
357
358         /*
359          * stash over-ride to indicate we've been here
360          * and for later update of acpi_fadt
361          */
362         acpi_sci_override_gsi = gsi;
363         return;
364 }
365
366 static int __init
367 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
368                        const unsigned long end)
369 {
370         struct acpi_table_int_src_ovr *intsrc = NULL;
371
372         intsrc = (struct acpi_table_int_src_ovr *)header;
373
374         if (BAD_MADT_ENTRY(intsrc, end))
375                 return -EINVAL;
376
377         acpi_table_print_madt_entry(header);
378
379         if (intsrc->bus_irq == acpi_fadt.sci_int) {
380                 acpi_sci_ioapic_setup(intsrc->global_irq,
381                                       intsrc->flags.polarity,
382                                       intsrc->flags.trigger);
383                 return 0;
384         }
385
386         if (acpi_skip_timer_override &&
387             intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
388                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
389                 return 0;
390         }
391
392         mp_override_legacy_irq(intsrc->bus_irq,
393                                intsrc->flags.polarity,
394                                intsrc->flags.trigger, intsrc->global_irq);
395
396         return 0;
397 }
398
399 static int __init
400 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
401 {
402         struct acpi_table_nmi_src *nmi_src = NULL;
403
404         nmi_src = (struct acpi_table_nmi_src *)header;
405
406         if (BAD_MADT_ENTRY(nmi_src, end))
407                 return -EINVAL;
408
409         acpi_table_print_madt_entry(header);
410
411         /* TBD: Support nimsrc entries? */
412
413         return 0;
414 }
415
416 #endif                          /* CONFIG_X86_IO_APIC */
417
418 /*
419  * acpi_pic_sci_set_trigger()
420  * 
421  * use ELCR to set PIC-mode trigger type for SCI
422  *
423  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
424  * it may require Edge Trigger -- use "acpi_sci=edge"
425  *
426  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
427  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
428  * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
429  * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
430  */
431
432 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
433 {
434         unsigned int mask = 1 << irq;
435         unsigned int old, new;
436
437         /* Real old ELCR mask */
438         old = inb(0x4d0) | (inb(0x4d1) << 8);
439
440         /*
441          * If we use ACPI to set PCI irq's, then we should clear ELCR
442          * since we will set it correctly as we enable the PCI irq
443          * routing.
444          */
445         new = acpi_noirq ? old : 0;
446
447         /*
448          * Update SCI information in the ELCR, it isn't in the PCI
449          * routing tables..
450          */
451         switch (trigger) {
452         case 1:         /* Edge - clear */
453                 new &= ~mask;
454                 break;
455         case 3:         /* Level - set */
456                 new |= mask;
457                 break;
458         }
459
460         if (old == new)
461                 return;
462
463         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
464         outb(new, 0x4d0);
465         outb(new >> 8, 0x4d1);
466 }
467
468 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
469 {
470         *irq = gsi;
471         return 0;
472 }
473
474 /*
475  * success: return IRQ number (>=0)
476  * failure: return < 0
477  */
478 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
479 {
480         unsigned int irq;
481         unsigned int plat_gsi = gsi;
482
483 #ifdef CONFIG_PCI
484         /*
485          * Make sure all (legacy) PCI IRQs are set as level-triggered.
486          */
487         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
488                 extern void eisa_set_level_irq(unsigned int irq);
489
490                 if (triggering == ACPI_LEVEL_SENSITIVE)
491                         eisa_set_level_irq(gsi);
492         }
493 #endif
494
495 #ifdef CONFIG_X86_IO_APIC
496         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
497                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
498         }
499 #endif
500         acpi_gsi_to_irq(plat_gsi, &irq);
501         return irq;
502 }
503
504 EXPORT_SYMBOL(acpi_register_gsi);
505
506 /*
507  *  ACPI based hotplug support for CPU
508  */
509 #ifdef CONFIG_ACPI_HOTPLUG_CPU
510 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
511 {
512         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
513         union acpi_object *obj;
514         struct acpi_table_lapic *lapic;
515         cpumask_t tmp_map, new_map;
516         u8 physid;
517         int cpu;
518
519         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
520                 return -EINVAL;
521
522         if (!buffer.length || !buffer.pointer)
523                 return -EINVAL;
524
525         obj = buffer.pointer;
526         if (obj->type != ACPI_TYPE_BUFFER ||
527             obj->buffer.length < sizeof(*lapic)) {
528                 kfree(buffer.pointer);
529                 return -EINVAL;
530         }
531
532         lapic = (struct acpi_table_lapic *)obj->buffer.pointer;
533
534         if ((lapic->header.type != ACPI_MADT_LAPIC) ||
535             (!lapic->flags.enabled)) {
536                 kfree(buffer.pointer);
537                 return -EINVAL;
538         }
539
540         physid = lapic->id;
541
542         kfree(buffer.pointer);
543         buffer.length = ACPI_ALLOCATE_BUFFER;
544         buffer.pointer = NULL;
545
546         tmp_map = cpu_present_map;
547         mp_register_lapic(physid, lapic->flags.enabled);
548
549         /*
550          * If mp_register_lapic successfully generates a new logical cpu
551          * number, then the following will get us exactly what was mapped
552          */
553         cpus_andnot(new_map, cpu_present_map, tmp_map);
554         if (cpus_empty(new_map)) {
555                 printk ("Unable to map lapic to logical cpu number\n");
556                 return -EINVAL;
557         }
558
559         cpu = first_cpu(new_map);
560
561         *pcpu = cpu;
562         return 0;
563 }
564
565 EXPORT_SYMBOL(acpi_map_lsapic);
566
567 int acpi_unmap_lsapic(int cpu)
568 {
569         int i;
570
571         for_each_possible_cpu(i) {
572                 if (x86_acpiid_to_apicid[i] == x86_cpu_to_apicid[cpu]) {
573                         x86_acpiid_to_apicid[i] = -1;
574                         break;
575                 }
576         }
577         x86_cpu_to_apicid[cpu] = -1;
578         cpu_clear(cpu, cpu_present_map);
579         num_processors--;
580
581         return (0);
582 }
583
584 EXPORT_SYMBOL(acpi_unmap_lsapic);
585 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
586
587 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
588 {
589         /* TBD */
590         return -EINVAL;
591 }
592
593 EXPORT_SYMBOL(acpi_register_ioapic);
594
595 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
596 {
597         /* TBD */
598         return -EINVAL;
599 }
600
601 EXPORT_SYMBOL(acpi_unregister_ioapic);
602
603 static unsigned long __init
604 acpi_scan_rsdp(unsigned long start, unsigned long length)
605 {
606         unsigned long offset = 0;
607         unsigned long sig_len = sizeof("RSD PTR ") - 1;
608
609         /*
610          * Scan all 16-byte boundaries of the physical memory region for the
611          * RSDP signature.
612          */
613         for (offset = 0; offset < length; offset += 16) {
614                 if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
615                         continue;
616                 return (start + offset);
617         }
618
619         return 0;
620 }
621
622 static int __init acpi_parse_sbf(struct acpi_table_header *header)
623 {
624         struct acpi_table_sbf *sb;
625
626         if (!header)
627                 return -EINVAL;
628
629         sb = (struct acpi_table_sbf *)header;
630         if (!sb) {
631                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
632                 return -ENODEV;
633         }
634
635         sbf_port = sb->sbf_cmos;        /* Save CMOS port */
636
637         return 0;
638 }
639
640 #ifdef CONFIG_HPET_TIMER
641
642 static int __init acpi_parse_hpet(struct acpi_table_header *header)
643 {
644         struct acpi_table_hpet *hpet_tbl;
645         struct resource *hpet_res;
646         resource_size_t res_start;
647
648         if (!header)
649                 return -EINVAL;
650
651         hpet_tbl = (struct acpi_table_hpet *)header;
652         if (!hpet_tbl) {
653                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
654                 return -ENODEV;
655         }
656
657         if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
658                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
659                        "memory.\n");
660                 return -1;
661         }
662
663 #define HPET_RESOURCE_NAME_SIZE 9
664         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
665         if (hpet_res) {
666                 memset(hpet_res, 0, sizeof(*hpet_res));
667                 hpet_res->name = (void *)&hpet_res[1];
668                 hpet_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
669                 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE,
670                          "HPET %u", hpet_tbl->number);
671                 hpet_res->end = (1 * 1024) - 1;
672         }
673
674 #ifdef  CONFIG_X86_64
675         vxtime.hpet_address = hpet_tbl->addr.addrl |
676             ((long)hpet_tbl->addr.addrh << 32);
677
678         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
679                hpet_tbl->id, vxtime.hpet_address);
680
681         res_start = vxtime.hpet_address;
682 #else                           /* X86 */
683         {
684                 extern unsigned long hpet_address;
685
686                 hpet_address = hpet_tbl->addr.addrl;
687                 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
688                        hpet_tbl->id, hpet_address);
689
690                 res_start = hpet_address;
691         }
692 #endif                          /* X86 */
693
694         if (hpet_res) {
695                 hpet_res->start = res_start;
696                 hpet_res->end += res_start;
697                 insert_resource(&iomem_resource, hpet_res);
698         }
699
700         return 0;
701 }
702 #else
703 #define acpi_parse_hpet NULL
704 #endif
705
706 #ifdef CONFIG_X86_PM_TIMER
707 extern u32 pmtmr_ioport;
708 #endif
709
710 static int __init acpi_parse_fadt(struct acpi_table_header *header)
711 {
712         struct fadt_descriptor *fadt = NULL;
713
714         fadt = (struct fadt_descriptor *)header;
715         if (!fadt) {
716                 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
717                 return 0;
718         }
719
720 #ifdef CONFIG_X86_PM_TIMER
721         /* detect the location of the ACPI PM Timer */
722         if (fadt->header.revision >= FADT2_REVISION_ID) {
723                 /* FADT rev. 2 */
724                 if (fadt->xpm_timer_block.space_id !=
725                     ACPI_ADR_SPACE_SYSTEM_IO)
726                         return 0;
727
728                 pmtmr_ioport = fadt->xpm_timer_block.address;
729                 /*
730                  * "X" fields are optional extensions to the original V1.0
731                  * fields, so we must selectively expand V1.0 fields if the
732                  * corresponding X field is zero.
733                  */
734                 if (!pmtmr_ioport)
735                         pmtmr_ioport = fadt->pm_timer_block;
736         } else {
737                 /* FADT rev. 1 */
738                 pmtmr_ioport = fadt->pm_timer_block;
739         }
740         if (pmtmr_ioport)
741                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
742                        pmtmr_ioport);
743 #endif
744         return 0;
745 }
746
747 unsigned long __init acpi_find_rsdp(void)
748 {
749         unsigned long rsdp_phys = 0;
750
751         if (efi_enabled) {
752                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
753                         return efi.acpi20;
754                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
755                         return efi.acpi;
756         }
757         /*
758          * Scan memory looking for the RSDP signature. First search EBDA (low
759          * memory) paragraphs and then search upper memory (E0000-FFFFF).
760          */
761         rsdp_phys = acpi_scan_rsdp(0, 0x400);
762         if (!rsdp_phys)
763                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
764
765         return rsdp_phys;
766 }
767
768 #ifdef  CONFIG_X86_LOCAL_APIC
769 /*
770  * Parse LAPIC entries in MADT
771  * returns 0 on success, < 0 on error
772  */
773 static int __init acpi_parse_madt_lapic_entries(void)
774 {
775         int count;
776
777         if (!cpu_has_apic)
778                 return -ENODEV;
779
780         /* 
781          * Note that the LAPIC address is obtained from the MADT (32-bit value)
782          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
783          */
784
785         count =
786             acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR,
787                                   acpi_parse_lapic_addr_ovr, 0);
788         if (count < 0) {
789                 printk(KERN_ERR PREFIX
790                        "Error parsing LAPIC address override entry\n");
791                 return count;
792         }
793
794         mp_register_lapic_address(acpi_lapic_addr);
795
796         count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
797                                       MAX_APICS);
798         if (!count) {
799                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
800                 /* TBD: Cleanup to allow fallback to MPS */
801                 return -ENODEV;
802         } else if (count < 0) {
803                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
804                 /* TBD: Cleanup to allow fallback to MPS */
805                 return count;
806         }
807
808         count =
809             acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
810         if (count < 0) {
811                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
812                 /* TBD: Cleanup to allow fallback to MPS */
813                 return count;
814         }
815         return 0;
816 }
817 #endif                          /* CONFIG_X86_LOCAL_APIC */
818
819 #ifdef  CONFIG_X86_IO_APIC
820 /*
821  * Parse IOAPIC related entries in MADT
822  * returns 0 on success, < 0 on error
823  */
824 static int __init acpi_parse_madt_ioapic_entries(void)
825 {
826         int count;
827
828         /*
829          * ACPI interpreter is required to complete interrupt setup,
830          * so if it is off, don't enumerate the io-apics with ACPI.
831          * If MPS is present, it will handle them,
832          * otherwise the system will stay in PIC mode
833          */
834         if (acpi_disabled || acpi_noirq) {
835                 return -ENODEV;
836         }
837
838         if (!cpu_has_apic) 
839                 return -ENODEV;
840
841         /*
842          * if "noapic" boot option, don't look for IO-APICs
843          */
844         if (skip_ioapic_setup) {
845                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
846                        "due to 'noapic' option.\n");
847                 return -ENODEV;
848         }
849
850         count =
851             acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic,
852                                   MAX_IO_APICS);
853         if (!count) {
854                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
855                 return -ENODEV;
856         } else if (count < 0) {
857                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
858                 return count;
859         }
860
861         count =
862             acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr,
863                                   NR_IRQ_VECTORS);
864         if (count < 0) {
865                 printk(KERN_ERR PREFIX
866                        "Error parsing interrupt source overrides entry\n");
867                 /* TBD: Cleanup to allow fallback to MPS */
868                 return count;
869         }
870
871         /*
872          * If BIOS did not supply an INT_SRC_OVR for the SCI
873          * pretend we got one so we can set the SCI flags.
874          */
875         if (!acpi_sci_override_gsi)
876                 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
877
878         /* Fill in identity legacy mapings where no override */
879         mp_config_acpi_legacy_irqs();
880
881         count =
882             acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src,
883                                   NR_IRQ_VECTORS);
884         if (count < 0) {
885                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
886                 /* TBD: Cleanup to allow fallback to MPS */
887                 return count;
888         }
889
890         return 0;
891 }
892 #else
893 static inline int acpi_parse_madt_ioapic_entries(void)
894 {
895         return -1;
896 }
897 #endif  /* !CONFIG_X86_IO_APIC */
898
899 static void __init acpi_process_madt(void)
900 {
901 #ifdef CONFIG_X86_LOCAL_APIC
902         int count, error;
903
904         count = acpi_table_parse("APIC", acpi_parse_madt);
905         if (count >= 1) {
906
907                 /*
908                  * Parse MADT LAPIC entries
909                  */
910                 error = acpi_parse_madt_lapic_entries();
911                 if (!error) {
912                         acpi_lapic = 1;
913
914 #ifdef CONFIG_X86_GENERICARCH
915                         generic_bigsmp_probe();
916 #endif
917                         /*
918                          * Parse MADT IO-APIC entries
919                          */
920                         error = acpi_parse_madt_ioapic_entries();
921                         if (!error) {
922                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
923                                 acpi_irq_balance_set(NULL);
924                                 acpi_ioapic = 1;
925
926                                 smp_found_config = 1;
927                                 clustered_apic_check();
928                         }
929                 }
930                 if (error == -EINVAL) {
931                         /*
932                          * Dell Precision Workstation 410, 610 come here.
933                          */
934                         printk(KERN_ERR PREFIX
935                                "Invalid BIOS MADT, disabling ACPI\n");
936                         disable_acpi();
937                 }
938         }
939 #endif
940         return;
941 }
942
943 #ifdef __i386__
944
945 static int __init disable_acpi_irq(struct dmi_system_id *d)
946 {
947         if (!acpi_force) {
948                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
949                        d->ident);
950                 acpi_noirq_set();
951         }
952         return 0;
953 }
954
955 static int __init disable_acpi_pci(struct dmi_system_id *d)
956 {
957         if (!acpi_force) {
958                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
959                        d->ident);
960                 acpi_disable_pci();
961         }
962         return 0;
963 }
964
965 static int __init dmi_disable_acpi(struct dmi_system_id *d)
966 {
967         if (!acpi_force) {
968                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
969                 disable_acpi();
970         } else {
971                 printk(KERN_NOTICE
972                        "Warning: DMI blacklist says broken, but acpi forced\n");
973         }
974         return 0;
975 }
976
977 /*
978  * Limit ACPI to CPU enumeration for HT
979  */
980 static int __init force_acpi_ht(struct dmi_system_id *d)
981 {
982         if (!acpi_force) {
983                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
984                        d->ident);
985                 disable_acpi();
986                 acpi_ht = 1;
987         } else {
988                 printk(KERN_NOTICE
989                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
990         }
991         return 0;
992 }
993
994 /*
995  * If your system is blacklisted here, but you find that acpi=force
996  * works for you, please contact acpi-devel@sourceforge.net
997  */
998 static struct dmi_system_id __initdata acpi_dmi_table[] = {
999         /*
1000          * Boxes that need ACPI disabled
1001          */
1002         {
1003          .callback = dmi_disable_acpi,
1004          .ident = "IBM Thinkpad",
1005          .matches = {
1006                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1007                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1008                      },
1009          },
1010
1011         /*
1012          * Boxes that need acpi=ht
1013          */
1014         {
1015          .callback = force_acpi_ht,
1016          .ident = "FSC Primergy T850",
1017          .matches = {
1018                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1019                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1020                      },
1021          },
1022         {
1023          .callback = force_acpi_ht,
1024          .ident = "DELL GX240",
1025          .matches = {
1026                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
1027                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
1028                      },
1029          },
1030         {
1031          .callback = force_acpi_ht,
1032          .ident = "HP VISUALIZE NT Workstation",
1033          .matches = {
1034                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1035                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1036                      },
1037          },
1038         {
1039          .callback = force_acpi_ht,
1040          .ident = "Compaq Workstation W8000",
1041          .matches = {
1042                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1043                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1044                      },
1045          },
1046         {
1047          .callback = force_acpi_ht,
1048          .ident = "ASUS P4B266",
1049          .matches = {
1050                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1051                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1052                      },
1053          },
1054         {
1055          .callback = force_acpi_ht,
1056          .ident = "ASUS P2B-DS",
1057          .matches = {
1058                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1059                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1060                      },
1061          },
1062         {
1063          .callback = force_acpi_ht,
1064          .ident = "ASUS CUR-DLS",
1065          .matches = {
1066                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1067                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1068                      },
1069          },
1070         {
1071          .callback = force_acpi_ht,
1072          .ident = "ABIT i440BX-W83977",
1073          .matches = {
1074                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1075                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1076                      },
1077          },
1078         {
1079          .callback = force_acpi_ht,
1080          .ident = "IBM Bladecenter",
1081          .matches = {
1082                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1083                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1084                      },
1085          },
1086         {
1087          .callback = force_acpi_ht,
1088          .ident = "IBM eServer xSeries 360",
1089          .matches = {
1090                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1091                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1092                      },
1093          },
1094         {
1095          .callback = force_acpi_ht,
1096          .ident = "IBM eserver xSeries 330",
1097          .matches = {
1098                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1099                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1100                      },
1101          },
1102         {
1103          .callback = force_acpi_ht,
1104          .ident = "IBM eserver xSeries 440",
1105          .matches = {
1106                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1107                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1108                      },
1109          },
1110
1111         /*
1112          * Boxes that need ACPI PCI IRQ routing disabled
1113          */
1114         {
1115          .callback = disable_acpi_irq,
1116          .ident = "ASUS A7V",
1117          .matches = {
1118                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1119                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1120                      /* newer BIOS, Revision 1011, does work */
1121                      DMI_MATCH(DMI_BIOS_VERSION,
1122                                "ASUS A7V ACPI BIOS Revision 1007"),
1123                      },
1124          },
1125
1126         /*
1127          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1128          */
1129         {                       /* _BBN 0 bug */
1130          .callback = disable_acpi_pci,
1131          .ident = "ASUS PR-DLS",
1132          .matches = {
1133                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1134                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1135                      DMI_MATCH(DMI_BIOS_VERSION,
1136                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1137                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1138                      },
1139          },
1140         {
1141          .callback = disable_acpi_pci,
1142          .ident = "Acer TravelMate 36x Laptop",
1143          .matches = {
1144                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1145                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1146                      },
1147          },
1148         {}
1149 };
1150
1151 #endif                          /* __i386__ */
1152
1153 /*
1154  * acpi_boot_table_init() and acpi_boot_init()
1155  *  called from setup_arch(), always.
1156  *      1. checksums all tables
1157  *      2. enumerates lapics
1158  *      3. enumerates io-apics
1159  *
1160  * acpi_table_init() is separate to allow reading SRAT without
1161  * other side effects.
1162  *
1163  * side effects of acpi_boot_init:
1164  *      acpi_lapic = 1 if LAPIC found
1165  *      acpi_ioapic = 1 if IOAPIC found
1166  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1167  *      if acpi_blacklisted() acpi_disabled = 1;
1168  *      acpi_irq_model=...
1169  *      ...
1170  *
1171  * return value: (currently ignored)
1172  *      0: success
1173  *      !0: failure
1174  */
1175
1176 int __init acpi_boot_table_init(void)
1177 {
1178         int error;
1179
1180 #ifdef __i386__
1181         dmi_check_system(acpi_dmi_table);
1182 #endif
1183
1184         /*
1185          * If acpi_disabled, bail out
1186          * One exception: acpi=ht continues far enough to enumerate LAPICs
1187          */
1188         if (acpi_disabled && !acpi_ht)
1189                 return 1;
1190
1191         /* 
1192          * Initialize the ACPI boot-time table parser.
1193          */
1194         error = acpi_table_init();
1195         if (error) {
1196                 disable_acpi();
1197                 return error;
1198         }
1199
1200         acpi_table_parse("BOOT", acpi_parse_sbf);
1201
1202         /*
1203          * blacklist may disable ACPI entirely
1204          */
1205         error = acpi_blacklisted();
1206         if (error) {
1207                 if (acpi_force) {
1208                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1209                 } else {
1210                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1211                         disable_acpi();
1212                         return error;
1213                 }
1214         }
1215
1216         return 0;
1217 }
1218
1219 int __init acpi_boot_init(void)
1220 {
1221         /*
1222          * If acpi_disabled, bail out
1223          * One exception: acpi=ht continues far enough to enumerate LAPICs
1224          */
1225         if (acpi_disabled && !acpi_ht)
1226                 return 1;
1227
1228         acpi_table_parse("BOOT", acpi_parse_sbf);
1229
1230         /*
1231          * set sci_int and PM timer address
1232          */
1233         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1234
1235         /*
1236          * Process the Multiple APIC Description Table (MADT), if present
1237          */
1238         acpi_process_madt();
1239
1240         acpi_table_parse("HPET", acpi_parse_hpet);
1241
1242         return 0;
1243 }
1244
1245 static int __init parse_acpi(char *arg)
1246 {
1247         if (!arg)
1248                 return -EINVAL;
1249
1250         /* "acpi=off" disables both ACPI table parsing and interpreter */
1251         if (strcmp(arg, "off") == 0) {
1252                 disable_acpi();
1253         }
1254         /* acpi=force to over-ride black-list */
1255         else if (strcmp(arg, "force") == 0) {
1256                 acpi_force = 1;
1257                 acpi_ht = 1;
1258                 acpi_disabled = 0;
1259         }
1260         /* acpi=strict disables out-of-spec workarounds */
1261         else if (strcmp(arg, "strict") == 0) {
1262                 acpi_strict = 1;
1263         }
1264         /* Limit ACPI just to boot-time to enable HT */
1265         else if (strcmp(arg, "ht") == 0) {
1266                 if (!acpi_force)
1267                         disable_acpi();
1268                 acpi_ht = 1;
1269         }
1270         /* "acpi=noirq" disables ACPI interrupt routing */
1271         else if (strcmp(arg, "noirq") == 0) {
1272                 acpi_noirq_set();
1273         } else {
1274                 /* Core will printk when we return error. */
1275                 return -EINVAL;
1276         }
1277         return 0;
1278 }
1279 early_param("acpi", parse_acpi);
1280
1281 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1282 static int __init parse_pci(char *arg)
1283 {
1284         if (arg && strcmp(arg, "noacpi") == 0)
1285                 acpi_disable_pci();
1286         return 0;
1287 }
1288 early_param("pci", parse_pci);
1289
1290 #ifdef CONFIG_X86_IO_APIC
1291 static int __init parse_acpi_skip_timer_override(char *arg)
1292 {
1293         acpi_skip_timer_override = 1;
1294         return 0;
1295 }
1296 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1297
1298 static int __init parse_acpi_use_timer_override(char *arg)
1299 {
1300         acpi_use_timer_override = 1;
1301         return 0;
1302 }
1303 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1304 #endif /* CONFIG_X86_IO_APIC */
1305
1306 static int __init setup_acpi_sci(char *s)
1307 {
1308         if (!s)
1309                 return -EINVAL;
1310         if (!strcmp(s, "edge"))
1311                 acpi_sci_flags.trigger = 1;
1312         else if (!strcmp(s, "level"))
1313                 acpi_sci_flags.trigger = 3;
1314         else if (!strcmp(s, "high"))
1315                 acpi_sci_flags.polarity = 1;
1316         else if (!strcmp(s, "low"))
1317                 acpi_sci_flags.polarity = 3;
1318         else
1319                 return -EINVAL;
1320         return 0;
1321 }
1322 early_param("acpi_sci", setup_acpi_sci);
1323
1324 int __acpi_acquire_global_lock(unsigned int *lock)
1325 {
1326         unsigned int old, new, val;
1327         do {
1328                 old = *lock;
1329                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1330                 val = cmpxchg(lock, old, new);
1331         } while (unlikely (val != old));
1332         return (new < 3) ? -1 : 0;
1333 }
1334
1335 int __acpi_release_global_lock(unsigned int *lock)
1336 {
1337         unsigned int old, new, val;
1338         do {
1339                 old = *lock;
1340                 new = old & ~0x3;
1341                 val = cmpxchg(lock, old, new);
1342         } while (unlikely (val != old));
1343         return old & 0x1;
1344 }