Revert HPET resource reservation
[sfrench/cifs-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/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
43 static int __initdata acpi_force = 0;
44
45 #ifdef  CONFIG_ACPI
46 int acpi_disabled = 0;
47 #else
48 int acpi_disabled = 1;
49 #endif
50 EXPORT_SYMBOL(acpi_disabled);
51
52 #ifdef  CONFIG_X86_64
53
54 #include <asm/proto.h>
55
56 static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
57
58
59 #else                           /* X86 */
60
61 #ifdef  CONFIG_X86_LOCAL_APIC
62 #include <mach_apic.h>
63 #include <mach_mpparse.h>
64 #endif                          /* CONFIG_X86_LOCAL_APIC */
65
66 #endif                          /* X86 */
67
68 #define BAD_MADT_ENTRY(entry, end) (                                        \
69                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
70                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
71
72 #define PREFIX                  "ACPI: "
73
74 int acpi_noirq;                         /* skip ACPI IRQ initialization */
75 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
76 int acpi_ht __initdata = 1;     /* enable HT */
77
78 int acpi_lapic;
79 int acpi_ioapic;
80 int acpi_strict;
81 EXPORT_SYMBOL(acpi_strict);
82
83 u8 acpi_sci_flags __initdata;
84 int acpi_sci_override_gsi __initdata;
85 int acpi_skip_timer_override __initdata;
86 int acpi_use_timer_override __initdata;
87
88 #ifdef CONFIG_X86_LOCAL_APIC
89 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
90 #endif
91
92 #ifndef __HAVE_ARCH_CMPXCHG
93 #warning ACPI uses CMPXCHG, i486 and later hardware
94 #endif
95
96 /* --------------------------------------------------------------------------
97                               Boot-time Configuration
98    -------------------------------------------------------------------------- */
99
100 /*
101  * The default interrupt routing model is PIC (8259).  This gets
102  * overriden if IOAPICs are enumerated (below).
103  */
104 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
105
106 #ifdef  CONFIG_X86_64
107
108 /* rely on all ACPI tables being in the direct mapping */
109 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
110 {
111         if (!phys_addr || !size)
112                 return NULL;
113
114         if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
115                 return __va(phys_addr);
116
117         return NULL;
118 }
119
120 #else
121
122 /*
123  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
124  * to map the target physical address. The problem is that set_fixmap()
125  * provides a single page, and it is possible that the page is not
126  * sufficient.
127  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
128  * i.e. until the next __va_range() call.
129  *
130  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
131  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
132  * count idx down while incrementing the phys address.
133  */
134 char *__acpi_map_table(unsigned long phys, unsigned long size)
135 {
136         unsigned long base, offset, mapped_size;
137         int idx;
138
139         if (phys + size < 8 * 1024 * 1024)
140                 return __va(phys);
141
142         offset = phys & (PAGE_SIZE - 1);
143         mapped_size = PAGE_SIZE - offset;
144         set_fixmap(FIX_ACPI_END, phys);
145         base = fix_to_virt(FIX_ACPI_END);
146
147         /*
148          * Most cases can be covered by the below.
149          */
150         idx = FIX_ACPI_END;
151         while (mapped_size < size) {
152                 if (--idx < FIX_ACPI_BEGIN)
153                         return NULL;    /* cannot handle this */
154                 phys += PAGE_SIZE;
155                 set_fixmap(idx, phys);
156                 mapped_size += PAGE_SIZE;
157         }
158
159         return ((unsigned char *)base + offset);
160 }
161 #endif
162
163 #ifdef CONFIG_PCI_MMCONFIG
164 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
165 struct acpi_mcfg_allocation *pci_mmcfg_config;
166 int pci_mmcfg_config_num;
167
168 int __init acpi_parse_mcfg(struct acpi_table_header *header)
169 {
170         struct acpi_table_mcfg *mcfg;
171         unsigned long i;
172         int config_size;
173
174         if (!header)
175                 return -EINVAL;
176
177         mcfg = (struct acpi_table_mcfg *)header;
178
179         /* how many config structures do we have */
180         pci_mmcfg_config_num = 0;
181         i = header->length - sizeof(struct acpi_table_mcfg);
182         while (i >= sizeof(struct acpi_mcfg_allocation)) {
183                 ++pci_mmcfg_config_num;
184                 i -= sizeof(struct acpi_mcfg_allocation);
185         };
186         if (pci_mmcfg_config_num == 0) {
187                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
188                 return -ENODEV;
189         }
190
191         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
192         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
193         if (!pci_mmcfg_config) {
194                 printk(KERN_WARNING PREFIX
195                        "No memory for MCFG config tables\n");
196                 return -ENOMEM;
197         }
198
199         memcpy(pci_mmcfg_config, &mcfg[1], config_size);
200         for (i = 0; i < pci_mmcfg_config_num; ++i) {
201                 if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
202                         printk(KERN_ERR PREFIX
203                                "MMCONFIG not in low 4GB of memory\n");
204                         kfree(pci_mmcfg_config);
205                         pci_mmcfg_config_num = 0;
206                         return -ENODEV;
207                 }
208         }
209
210         return 0;
211 }
212 #endif                          /* CONFIG_PCI_MMCONFIG */
213
214 #ifdef CONFIG_X86_LOCAL_APIC
215 static int __init acpi_parse_madt(struct acpi_table_header *table)
216 {
217         struct acpi_table_madt *madt = NULL;
218
219         if (!cpu_has_apic)
220                 return -EINVAL;
221
222         madt = (struct acpi_table_madt *)table;
223         if (!madt) {
224                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
225                 return -ENODEV;
226         }
227
228         if (madt->address) {
229                 acpi_lapic_addr = (u64) madt->address;
230
231                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
232                        madt->address);
233         }
234
235         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
236
237         return 0;
238 }
239
240 static int __init
241 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
242 {
243         struct acpi_madt_local_apic *processor = NULL;
244
245         processor = (struct acpi_madt_local_apic *)header;
246
247         if (BAD_MADT_ENTRY(processor, end))
248                 return -EINVAL;
249
250         acpi_table_print_madt_entry(header);
251
252         /*
253          * We need to register disabled CPU as well to permit
254          * counting disabled CPUs. This allows us to size
255          * cpus_possible_map more accurately, to permit
256          * to not preallocating memory for all NR_CPUS
257          * when we use CPU hotplug.
258          */
259         mp_register_lapic(processor->id,        /* APIC ID */
260                           processor->lapic_flags & ACPI_MADT_ENABLED);  /* Enabled? */
261
262         return 0;
263 }
264
265 static int __init
266 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
267                           const unsigned long end)
268 {
269         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
270
271         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
272
273         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
274                 return -EINVAL;
275
276         acpi_lapic_addr = lapic_addr_ovr->address;
277
278         return 0;
279 }
280
281 static int __init
282 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
283 {
284         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
285
286         lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
287
288         if (BAD_MADT_ENTRY(lapic_nmi, end))
289                 return -EINVAL;
290
291         acpi_table_print_madt_entry(header);
292
293         if (lapic_nmi->lint != 1)
294                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
295
296         return 0;
297 }
298
299 #endif                          /*CONFIG_X86_LOCAL_APIC */
300
301 #ifdef CONFIG_X86_IO_APIC
302
303 static int __init
304 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
305 {
306         struct acpi_madt_io_apic *ioapic = NULL;
307
308         ioapic = (struct acpi_madt_io_apic *)header;
309
310         if (BAD_MADT_ENTRY(ioapic, end))
311                 return -EINVAL;
312
313         acpi_table_print_madt_entry(header);
314
315         mp_register_ioapic(ioapic->id,
316                            ioapic->address, ioapic->global_irq_base);
317
318         return 0;
319 }
320
321 /*
322  * Parse Interrupt Source Override for the ACPI SCI
323  */
324 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
325 {
326         if (trigger == 0)       /* compatible SCI trigger is level */
327                 trigger = 3;
328
329         if (polarity == 0)      /* compatible SCI polarity is low */
330                 polarity = 3;
331
332         /* Command-line over-ride via acpi_sci= */
333         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
334                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
335
336         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
337                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
338
339         /*
340          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
341          * If GSI is < 16, this will update its flags,
342          * else it will create a new mp_irqs[] entry.
343          */
344         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
345
346         /*
347          * stash over-ride to indicate we've been here
348          * and for later update of acpi_gbl_FADT
349          */
350         acpi_sci_override_gsi = gsi;
351         return;
352 }
353
354 static int __init
355 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
356                        const unsigned long end)
357 {
358         struct acpi_madt_interrupt_override *intsrc = NULL;
359
360         intsrc = (struct acpi_madt_interrupt_override *)header;
361
362         if (BAD_MADT_ENTRY(intsrc, end))
363                 return -EINVAL;
364
365         acpi_table_print_madt_entry(header);
366
367         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
368                 acpi_sci_ioapic_setup(intsrc->global_irq,
369                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
370                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
371                 return 0;
372         }
373
374         if (acpi_skip_timer_override &&
375             intsrc->source_irq == 0 && intsrc->global_irq == 2) {
376                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
377                 return 0;
378         }
379
380         mp_override_legacy_irq(intsrc->source_irq,
381                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
382                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
383                                 intsrc->global_irq);
384
385         return 0;
386 }
387
388 static int __init
389 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
390 {
391         struct acpi_madt_nmi_source *nmi_src = NULL;
392
393         nmi_src = (struct acpi_madt_nmi_source *)header;
394
395         if (BAD_MADT_ENTRY(nmi_src, end))
396                 return -EINVAL;
397
398         acpi_table_print_madt_entry(header);
399
400         /* TBD: Support nimsrc entries? */
401
402         return 0;
403 }
404
405 #endif                          /* CONFIG_X86_IO_APIC */
406
407 /*
408  * acpi_pic_sci_set_trigger()
409  *
410  * use ELCR to set PIC-mode trigger type for SCI
411  *
412  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
413  * it may require Edge Trigger -- use "acpi_sci=edge"
414  *
415  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
416  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
417  * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
418  * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
419  */
420
421 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
422 {
423         unsigned int mask = 1 << irq;
424         unsigned int old, new;
425
426         /* Real old ELCR mask */
427         old = inb(0x4d0) | (inb(0x4d1) << 8);
428
429         /*
430          * If we use ACPI to set PCI irq's, then we should clear ELCR
431          * since we will set it correctly as we enable the PCI irq
432          * routing.
433          */
434         new = acpi_noirq ? old : 0;
435
436         /*
437          * Update SCI information in the ELCR, it isn't in the PCI
438          * routing tables..
439          */
440         switch (trigger) {
441         case 1:         /* Edge - clear */
442                 new &= ~mask;
443                 break;
444         case 3:         /* Level - set */
445                 new |= mask;
446                 break;
447         }
448
449         if (old == new)
450                 return;
451
452         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
453         outb(new, 0x4d0);
454         outb(new >> 8, 0x4d1);
455 }
456
457 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
458 {
459         *irq = gsi;
460         return 0;
461 }
462
463 /*
464  * success: return IRQ number (>=0)
465  * failure: return < 0
466  */
467 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
468 {
469         unsigned int irq;
470         unsigned int plat_gsi = gsi;
471
472 #ifdef CONFIG_PCI
473         /*
474          * Make sure all (legacy) PCI IRQs are set as level-triggered.
475          */
476         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
477                 extern void eisa_set_level_irq(unsigned int irq);
478
479                 if (triggering == ACPI_LEVEL_SENSITIVE)
480                         eisa_set_level_irq(gsi);
481         }
482 #endif
483
484 #ifdef CONFIG_X86_IO_APIC
485         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
486                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
487         }
488 #endif
489         acpi_gsi_to_irq(plat_gsi, &irq);
490         return irq;
491 }
492
493 EXPORT_SYMBOL(acpi_register_gsi);
494
495 /*
496  *  ACPI based hotplug support for CPU
497  */
498 #ifdef CONFIG_ACPI_HOTPLUG_CPU
499 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
500 {
501         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
502         union acpi_object *obj;
503         struct acpi_madt_local_apic *lapic;
504         cpumask_t tmp_map, new_map;
505         u8 physid;
506         int cpu;
507
508         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
509                 return -EINVAL;
510
511         if (!buffer.length || !buffer.pointer)
512                 return -EINVAL;
513
514         obj = buffer.pointer;
515         if (obj->type != ACPI_TYPE_BUFFER ||
516             obj->buffer.length < sizeof(*lapic)) {
517                 kfree(buffer.pointer);
518                 return -EINVAL;
519         }
520
521         lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
522
523         if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
524             !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
525                 kfree(buffer.pointer);
526                 return -EINVAL;
527         }
528
529         physid = lapic->id;
530
531         kfree(buffer.pointer);
532         buffer.length = ACPI_ALLOCATE_BUFFER;
533         buffer.pointer = NULL;
534
535         tmp_map = cpu_present_map;
536         mp_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
537
538         /*
539          * If mp_register_lapic successfully generates a new logical cpu
540          * number, then the following will get us exactly what was mapped
541          */
542         cpus_andnot(new_map, cpu_present_map, tmp_map);
543         if (cpus_empty(new_map)) {
544                 printk ("Unable to map lapic to logical cpu number\n");
545                 return -EINVAL;
546         }
547
548         cpu = first_cpu(new_map);
549
550         *pcpu = cpu;
551         return 0;
552 }
553
554 EXPORT_SYMBOL(acpi_map_lsapic);
555
556 int acpi_unmap_lsapic(int cpu)
557 {
558         x86_cpu_to_apicid[cpu] = -1;
559         cpu_clear(cpu, cpu_present_map);
560         num_processors--;
561
562         return (0);
563 }
564
565 EXPORT_SYMBOL(acpi_unmap_lsapic);
566 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
567
568 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
569 {
570         /* TBD */
571         return -EINVAL;
572 }
573
574 EXPORT_SYMBOL(acpi_register_ioapic);
575
576 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
577 {
578         /* TBD */
579         return -EINVAL;
580 }
581
582 EXPORT_SYMBOL(acpi_unregister_ioapic);
583
584 static unsigned long __init
585 acpi_scan_rsdp(unsigned long start, unsigned long length)
586 {
587         unsigned long offset = 0;
588         unsigned long sig_len = sizeof("RSD PTR ") - 1;
589
590         /*
591          * Scan all 16-byte boundaries of the physical memory region for the
592          * RSDP signature.
593          */
594         for (offset = 0; offset < length; offset += 16) {
595                 if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
596                         continue;
597                 return (start + offset);
598         }
599
600         return 0;
601 }
602
603 static int __init acpi_parse_sbf(struct acpi_table_header *table)
604 {
605         struct acpi_table_boot *sb;
606
607         sb = (struct acpi_table_boot *)table;
608         if (!sb) {
609                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
610                 return -ENODEV;
611         }
612
613         sbf_port = sb->cmos_index;      /* Save CMOS port */
614
615         return 0;
616 }
617
618 #ifdef CONFIG_HPET_TIMER
619 #include <asm/hpet.h>
620
621 static int __init acpi_parse_hpet(struct acpi_table_header *table)
622 {
623         struct acpi_table_hpet *hpet_tbl;
624         struct resource *hpet_res;
625         resource_size_t res_start;
626
627         hpet_tbl = (struct acpi_table_hpet *)table;
628         if (!hpet_tbl) {
629                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
630                 return -ENODEV;
631         }
632
633         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
634                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
635                        "memory.\n");
636                 return -1;
637         }
638
639         hpet_address = hpet_tbl->address.address;
640         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
641                hpet_tbl->id, hpet_address);
642
643         return 0;
644 }
645 #else
646 #define acpi_parse_hpet NULL
647 #endif
648
649 static int __init acpi_parse_fadt(struct acpi_table_header *table)
650 {
651
652 #ifdef CONFIG_X86_PM_TIMER
653         /* detect the location of the ACPI PM Timer */
654         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
655                 /* FADT rev. 2 */
656                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
657                     ACPI_ADR_SPACE_SYSTEM_IO)
658                         return 0;
659
660                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
661                 /*
662                  * "X" fields are optional extensions to the original V1.0
663                  * fields, so we must selectively expand V1.0 fields if the
664                  * corresponding X field is zero.
665                  */
666                 if (!pmtmr_ioport)
667                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
668         } else {
669                 /* FADT rev. 1 */
670                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
671         }
672         if (pmtmr_ioport)
673                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
674                        pmtmr_ioport);
675 #endif
676         return 0;
677 }
678
679 unsigned long __init acpi_find_rsdp(void)
680 {
681         unsigned long rsdp_phys = 0;
682
683         if (efi_enabled) {
684                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
685                         return efi.acpi20;
686                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
687                         return efi.acpi;
688         }
689         /*
690          * Scan memory looking for the RSDP signature. First search EBDA (low
691          * memory) paragraphs and then search upper memory (E0000-FFFFF).
692          */
693         rsdp_phys = acpi_scan_rsdp(0, 0x400);
694         if (!rsdp_phys)
695                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
696
697         return rsdp_phys;
698 }
699
700 #ifdef  CONFIG_X86_LOCAL_APIC
701 /*
702  * Parse LAPIC entries in MADT
703  * returns 0 on success, < 0 on error
704  */
705 static int __init acpi_parse_madt_lapic_entries(void)
706 {
707         int count;
708
709         if (!cpu_has_apic)
710                 return -ENODEV;
711
712         /*
713          * Note that the LAPIC address is obtained from the MADT (32-bit value)
714          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
715          */
716
717         count =
718             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
719                                   acpi_parse_lapic_addr_ovr, 0);
720         if (count < 0) {
721                 printk(KERN_ERR PREFIX
722                        "Error parsing LAPIC address override entry\n");
723                 return count;
724         }
725
726         mp_register_lapic_address(acpi_lapic_addr);
727
728         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_parse_lapic,
729                                       MAX_APICS);
730         if (!count) {
731                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
732                 /* TBD: Cleanup to allow fallback to MPS */
733                 return -ENODEV;
734         } else if (count < 0) {
735                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
736                 /* TBD: Cleanup to allow fallback to MPS */
737                 return count;
738         }
739
740         count =
741             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
742         if (count < 0) {
743                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
744                 /* TBD: Cleanup to allow fallback to MPS */
745                 return count;
746         }
747         return 0;
748 }
749 #endif                          /* CONFIG_X86_LOCAL_APIC */
750
751 #ifdef  CONFIG_X86_IO_APIC
752 /*
753  * Parse IOAPIC related entries in MADT
754  * returns 0 on success, < 0 on error
755  */
756 static int __init acpi_parse_madt_ioapic_entries(void)
757 {
758         int count;
759
760         /*
761          * ACPI interpreter is required to complete interrupt setup,
762          * so if it is off, don't enumerate the io-apics with ACPI.
763          * If MPS is present, it will handle them,
764          * otherwise the system will stay in PIC mode
765          */
766         if (acpi_disabled || acpi_noirq) {
767                 return -ENODEV;
768         }
769
770         if (!cpu_has_apic)
771                 return -ENODEV;
772
773         /*
774          * if "noapic" boot option, don't look for IO-APICs
775          */
776         if (skip_ioapic_setup) {
777                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
778                        "due to 'noapic' option.\n");
779                 return -ENODEV;
780         }
781
782         count =
783             acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
784                                   MAX_IO_APICS);
785         if (!count) {
786                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
787                 return -ENODEV;
788         } else if (count < 0) {
789                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
790                 return count;
791         }
792
793         count =
794             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
795                                   NR_IRQ_VECTORS);
796         if (count < 0) {
797                 printk(KERN_ERR PREFIX
798                        "Error parsing interrupt source overrides entry\n");
799                 /* TBD: Cleanup to allow fallback to MPS */
800                 return count;
801         }
802
803         /*
804          * If BIOS did not supply an INT_SRC_OVR for the SCI
805          * pretend we got one so we can set the SCI flags.
806          */
807         if (!acpi_sci_override_gsi)
808                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
809
810         /* Fill in identity legacy mapings where no override */
811         mp_config_acpi_legacy_irqs();
812
813         count =
814             acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
815                                   NR_IRQ_VECTORS);
816         if (count < 0) {
817                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
818                 /* TBD: Cleanup to allow fallback to MPS */
819                 return count;
820         }
821
822         return 0;
823 }
824 #else
825 static inline int acpi_parse_madt_ioapic_entries(void)
826 {
827         return -1;
828 }
829 #endif  /* !CONFIG_X86_IO_APIC */
830
831 static void __init acpi_process_madt(void)
832 {
833 #ifdef CONFIG_X86_LOCAL_APIC
834         int error;
835
836         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
837
838                 /*
839                  * Parse MADT LAPIC entries
840                  */
841                 error = acpi_parse_madt_lapic_entries();
842                 if (!error) {
843                         acpi_lapic = 1;
844
845 #ifdef CONFIG_X86_GENERICARCH
846                         generic_bigsmp_probe();
847 #endif
848                         /*
849                          * Parse MADT IO-APIC entries
850                          */
851                         error = acpi_parse_madt_ioapic_entries();
852                         if (!error) {
853                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
854                                 acpi_irq_balance_set(NULL);
855                                 acpi_ioapic = 1;
856
857                                 smp_found_config = 1;
858                                 setup_apic_routing();
859                         }
860                 }
861                 if (error == -EINVAL) {
862                         /*
863                          * Dell Precision Workstation 410, 610 come here.
864                          */
865                         printk(KERN_ERR PREFIX
866                                "Invalid BIOS MADT, disabling ACPI\n");
867                         disable_acpi();
868                 }
869         }
870 #endif
871         return;
872 }
873
874 #ifdef __i386__
875
876 static int __init disable_acpi_irq(struct dmi_system_id *d)
877 {
878         if (!acpi_force) {
879                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
880                        d->ident);
881                 acpi_noirq_set();
882         }
883         return 0;
884 }
885
886 static int __init disable_acpi_pci(struct dmi_system_id *d)
887 {
888         if (!acpi_force) {
889                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
890                        d->ident);
891                 acpi_disable_pci();
892         }
893         return 0;
894 }
895
896 static int __init dmi_disable_acpi(struct dmi_system_id *d)
897 {
898         if (!acpi_force) {
899                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
900                 disable_acpi();
901         } else {
902                 printk(KERN_NOTICE
903                        "Warning: DMI blacklist says broken, but acpi forced\n");
904         }
905         return 0;
906 }
907
908 /*
909  * Limit ACPI to CPU enumeration for HT
910  */
911 static int __init force_acpi_ht(struct dmi_system_id *d)
912 {
913         if (!acpi_force) {
914                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
915                        d->ident);
916                 disable_acpi();
917                 acpi_ht = 1;
918         } else {
919                 printk(KERN_NOTICE
920                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
921         }
922         return 0;
923 }
924
925 /*
926  * If your system is blacklisted here, but you find that acpi=force
927  * works for you, please contact acpi-devel@sourceforge.net
928  */
929 static struct dmi_system_id __initdata acpi_dmi_table[] = {
930         /*
931          * Boxes that need ACPI disabled
932          */
933         {
934          .callback = dmi_disable_acpi,
935          .ident = "IBM Thinkpad",
936          .matches = {
937                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
938                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
939                      },
940          },
941
942         /*
943          * Boxes that need acpi=ht
944          */
945         {
946          .callback = force_acpi_ht,
947          .ident = "FSC Primergy T850",
948          .matches = {
949                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
950                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
951                      },
952          },
953         {
954          .callback = force_acpi_ht,
955          .ident = "DELL GX240",
956          .matches = {
957                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
958                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
959                      },
960          },
961         {
962          .callback = force_acpi_ht,
963          .ident = "HP VISUALIZE NT Workstation",
964          .matches = {
965                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
966                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
967                      },
968          },
969         {
970          .callback = force_acpi_ht,
971          .ident = "Compaq Workstation W8000",
972          .matches = {
973                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
974                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
975                      },
976          },
977         {
978          .callback = force_acpi_ht,
979          .ident = "ASUS P4B266",
980          .matches = {
981                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
982                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
983                      },
984          },
985         {
986          .callback = force_acpi_ht,
987          .ident = "ASUS P2B-DS",
988          .matches = {
989                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
990                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
991                      },
992          },
993         {
994          .callback = force_acpi_ht,
995          .ident = "ASUS CUR-DLS",
996          .matches = {
997                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
998                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
999                      },
1000          },
1001         {
1002          .callback = force_acpi_ht,
1003          .ident = "ABIT i440BX-W83977",
1004          .matches = {
1005                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1006                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1007                      },
1008          },
1009         {
1010          .callback = force_acpi_ht,
1011          .ident = "IBM Bladecenter",
1012          .matches = {
1013                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1014                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1015                      },
1016          },
1017         {
1018          .callback = force_acpi_ht,
1019          .ident = "IBM eServer xSeries 360",
1020          .matches = {
1021                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1022                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1023                      },
1024          },
1025         {
1026          .callback = force_acpi_ht,
1027          .ident = "IBM eserver xSeries 330",
1028          .matches = {
1029                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1030                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1031                      },
1032          },
1033         {
1034          .callback = force_acpi_ht,
1035          .ident = "IBM eserver xSeries 440",
1036          .matches = {
1037                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1038                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1039                      },
1040          },
1041
1042         /*
1043          * Boxes that need ACPI PCI IRQ routing disabled
1044          */
1045         {
1046          .callback = disable_acpi_irq,
1047          .ident = "ASUS A7V",
1048          .matches = {
1049                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1050                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1051                      /* newer BIOS, Revision 1011, does work */
1052                      DMI_MATCH(DMI_BIOS_VERSION,
1053                                "ASUS A7V ACPI BIOS Revision 1007"),
1054                      },
1055          },
1056         {
1057                 /*
1058                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1059                  * for LPC bridge, which is needed for the PCI
1060                  * interrupt links to work. DSDT fix is in bug 5966.
1061                  * 2645, 2646 model numbers are shared with 600/600E/600X
1062                  */
1063          .callback = disable_acpi_irq,
1064          .ident = "IBM Thinkpad 600 Series 2645",
1065          .matches = {
1066                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1067                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1068                      },
1069          },
1070         {
1071          .callback = disable_acpi_irq,
1072          .ident = "IBM Thinkpad 600 Series 2646",
1073          .matches = {
1074                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1075                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1076                      },
1077          },
1078         /*
1079          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1080          */
1081         {                       /* _BBN 0 bug */
1082          .callback = disable_acpi_pci,
1083          .ident = "ASUS PR-DLS",
1084          .matches = {
1085                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1086                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1087                      DMI_MATCH(DMI_BIOS_VERSION,
1088                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1089                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1090                      },
1091          },
1092         {
1093          .callback = disable_acpi_pci,
1094          .ident = "Acer TravelMate 36x Laptop",
1095          .matches = {
1096                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1097                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1098                      },
1099          },
1100         {}
1101 };
1102
1103 #endif                          /* __i386__ */
1104
1105 /*
1106  * acpi_boot_table_init() and acpi_boot_init()
1107  *  called from setup_arch(), always.
1108  *      1. checksums all tables
1109  *      2. enumerates lapics
1110  *      3. enumerates io-apics
1111  *
1112  * acpi_table_init() is separate to allow reading SRAT without
1113  * other side effects.
1114  *
1115  * side effects of acpi_boot_init:
1116  *      acpi_lapic = 1 if LAPIC found
1117  *      acpi_ioapic = 1 if IOAPIC found
1118  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1119  *      if acpi_blacklisted() acpi_disabled = 1;
1120  *      acpi_irq_model=...
1121  *      ...
1122  *
1123  * return value: (currently ignored)
1124  *      0: success
1125  *      !0: failure
1126  */
1127
1128 int __init acpi_boot_table_init(void)
1129 {
1130         int error;
1131
1132 #ifdef __i386__
1133         dmi_check_system(acpi_dmi_table);
1134 #endif
1135
1136         /*
1137          * If acpi_disabled, bail out
1138          * One exception: acpi=ht continues far enough to enumerate LAPICs
1139          */
1140         if (acpi_disabled && !acpi_ht)
1141                 return 1;
1142
1143         /*
1144          * Initialize the ACPI boot-time table parser.
1145          */
1146         error = acpi_table_init();
1147         if (error) {
1148                 disable_acpi();
1149                 return error;
1150         }
1151
1152         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1153
1154         /*
1155          * blacklist may disable ACPI entirely
1156          */
1157         error = acpi_blacklisted();
1158         if (error) {
1159                 if (acpi_force) {
1160                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1161                 } else {
1162                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1163                         disable_acpi();
1164                         return error;
1165                 }
1166         }
1167
1168         return 0;
1169 }
1170
1171 int __init acpi_boot_init(void)
1172 {
1173         /*
1174          * If acpi_disabled, bail out
1175          * One exception: acpi=ht continues far enough to enumerate LAPICs
1176          */
1177         if (acpi_disabled && !acpi_ht)
1178                 return 1;
1179
1180         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1181
1182         /*
1183          * set sci_int and PM timer address
1184          */
1185         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1186
1187         /*
1188          * Process the Multiple APIC Description Table (MADT), if present
1189          */
1190         acpi_process_madt();
1191
1192         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1193
1194         return 0;
1195 }
1196
1197 static int __init parse_acpi(char *arg)
1198 {
1199         if (!arg)
1200                 return -EINVAL;
1201
1202         /* "acpi=off" disables both ACPI table parsing and interpreter */
1203         if (strcmp(arg, "off") == 0) {
1204                 disable_acpi();
1205         }
1206         /* acpi=force to over-ride black-list */
1207         else if (strcmp(arg, "force") == 0) {
1208                 acpi_force = 1;
1209                 acpi_ht = 1;
1210                 acpi_disabled = 0;
1211         }
1212         /* acpi=strict disables out-of-spec workarounds */
1213         else if (strcmp(arg, "strict") == 0) {
1214                 acpi_strict = 1;
1215         }
1216         /* Limit ACPI just to boot-time to enable HT */
1217         else if (strcmp(arg, "ht") == 0) {
1218                 if (!acpi_force)
1219                         disable_acpi();
1220                 acpi_ht = 1;
1221         }
1222         /* "acpi=noirq" disables ACPI interrupt routing */
1223         else if (strcmp(arg, "noirq") == 0) {
1224                 acpi_noirq_set();
1225         } else {
1226                 /* Core will printk when we return error. */
1227                 return -EINVAL;
1228         }
1229         return 0;
1230 }
1231 early_param("acpi", parse_acpi);
1232
1233 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1234 static int __init parse_pci(char *arg)
1235 {
1236         if (arg && strcmp(arg, "noacpi") == 0)
1237                 acpi_disable_pci();
1238         return 0;
1239 }
1240 early_param("pci", parse_pci);
1241
1242 #ifdef CONFIG_X86_IO_APIC
1243 static int __init parse_acpi_skip_timer_override(char *arg)
1244 {
1245         acpi_skip_timer_override = 1;
1246         return 0;
1247 }
1248 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1249
1250 static int __init parse_acpi_use_timer_override(char *arg)
1251 {
1252         acpi_use_timer_override = 1;
1253         return 0;
1254 }
1255 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1256 #endif /* CONFIG_X86_IO_APIC */
1257
1258 static int __init setup_acpi_sci(char *s)
1259 {
1260         if (!s)
1261                 return -EINVAL;
1262         if (!strcmp(s, "edge"))
1263                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1264                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1265         else if (!strcmp(s, "level"))
1266                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1267                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1268         else if (!strcmp(s, "high"))
1269                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1270                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1271         else if (!strcmp(s, "low"))
1272                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1273                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1274         else
1275                 return -EINVAL;
1276         return 0;
1277 }
1278 early_param("acpi_sci", setup_acpi_sci);
1279
1280 int __acpi_acquire_global_lock(unsigned int *lock)
1281 {
1282         unsigned int old, new, val;
1283         do {
1284                 old = *lock;
1285                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1286                 val = cmpxchg(lock, old, new);
1287         } while (unlikely (val != old));
1288         return (new < 3) ? -1 : 0;
1289 }
1290
1291 int __acpi_release_global_lock(unsigned int *lock)
1292 {
1293         unsigned int old, new, val;
1294         do {
1295                 old = *lock;
1296                 new = old & ~0x3;
1297                 val = cmpxchg(lock, old, new);
1298         } while (unlikely (val != old));
1299         return old & 0x1;
1300 }