[PATCH] x86: Remove unneeded externs in acpi/boot.c
[linux-drm-fsl-dcu.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/module.h>
30 #include <linux/dmi.h>
31 #include <linux/irq.h>
32
33 #include <asm/pgtable.h>
34 #include <asm/io_apic.h>
35 #include <asm/apic.h>
36 #include <asm/io.h>
37 #include <asm/mpspec.h>
38
39 int __initdata acpi_force = 0;
40
41 #ifdef  CONFIG_ACPI
42 int acpi_disabled = 0;
43 #else
44 int acpi_disabled = 1;
45 #endif
46 EXPORT_SYMBOL(acpi_disabled);
47
48 #ifdef  CONFIG_X86_64
49
50 #include <asm/proto.h>
51
52 static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
53
54
55 #else                           /* X86 */
56
57 #ifdef  CONFIG_X86_LOCAL_APIC
58 #include <mach_apic.h>
59 #include <mach_mpparse.h>
60 #endif                          /* CONFIG_X86_LOCAL_APIC */
61
62 static inline int gsi_irq_sharing(int gsi) { return gsi; }
63
64 #endif                          /* X86 */
65
66 #define BAD_MADT_ENTRY(entry, end) (                                        \
67                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
68                 ((acpi_table_entry_header *)entry)->length < sizeof(*entry))
69
70 #define PREFIX                  "ACPI: "
71
72 int acpi_noirq __initdata;      /* skip ACPI IRQ initialization */
73 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
74 int acpi_ht __initdata = 1;     /* enable HT */
75
76 int acpi_lapic;
77 int acpi_ioapic;
78 int acpi_strict;
79 EXPORT_SYMBOL(acpi_strict);
80
81 acpi_interrupt_flags acpi_sci_flags __initdata;
82 int acpi_sci_override_gsi __initdata;
83 int acpi_skip_timer_override __initdata;
84
85 #ifdef CONFIG_X86_LOCAL_APIC
86 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
87 #endif
88
89 #ifndef __HAVE_ARCH_CMPXCHG
90 #warning ACPI uses CMPXCHG, i486 and later hardware
91 #endif
92
93 #define MAX_MADT_ENTRIES        256
94 u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
95     {[0 ... MAX_MADT_ENTRIES - 1] = 0xff };
96 EXPORT_SYMBOL(x86_acpiid_to_apicid);
97
98 /* --------------------------------------------------------------------------
99                               Boot-time Configuration
100    -------------------------------------------------------------------------- */
101
102 /*
103  * The default interrupt routing model is PIC (8259).  This gets
104  * overriden if IOAPICs are enumerated (below).
105  */
106 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
107
108 #ifdef  CONFIG_X86_64
109
110 /* rely on all ACPI tables being in the direct mapping */
111 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
112 {
113         if (!phys_addr || !size)
114                 return NULL;
115
116         if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
117                 return __va(phys_addr);
118
119         return NULL;
120 }
121
122 #else
123
124 /*
125  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
126  * to map the target physical address. The problem is that set_fixmap()
127  * provides a single page, and it is possible that the page is not
128  * sufficient.
129  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
130  * i.e. until the next __va_range() call.
131  *
132  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
133  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
134  * count idx down while incrementing the phys address.
135  */
136 char *__acpi_map_table(unsigned long phys, unsigned long size)
137 {
138         unsigned long base, offset, mapped_size;
139         int idx;
140
141         if (phys + size < 8 * 1024 * 1024)
142                 return __va(phys);
143
144         offset = phys & (PAGE_SIZE - 1);
145         mapped_size = PAGE_SIZE - offset;
146         set_fixmap(FIX_ACPI_END, phys);
147         base = fix_to_virt(FIX_ACPI_END);
148
149         /*
150          * Most cases can be covered by the below.
151          */
152         idx = FIX_ACPI_END;
153         while (mapped_size < size) {
154                 if (--idx < FIX_ACPI_BEGIN)
155                         return NULL;    /* cannot handle this */
156                 phys += PAGE_SIZE;
157                 set_fixmap(idx, phys);
158                 mapped_size += PAGE_SIZE;
159         }
160
161         return ((unsigned char *)base + offset);
162 }
163 #endif
164
165 #ifdef CONFIG_PCI_MMCONFIG
166 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
167 struct acpi_table_mcfg_config *pci_mmcfg_config;
168 int pci_mmcfg_config_num;
169
170 int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
171 {
172         struct acpi_table_mcfg *mcfg;
173         unsigned long i;
174         int config_size;
175
176         if (!phys_addr || !size)
177                 return -EINVAL;
178
179         mcfg = (struct acpi_table_mcfg *)__acpi_map_table(phys_addr, size);
180         if (!mcfg) {
181                 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
182                 return -ENODEV;
183         }
184
185         /* how many config structures do we have */
186         pci_mmcfg_config_num = 0;
187         i = size - sizeof(struct acpi_table_mcfg);
188         while (i >= sizeof(struct acpi_table_mcfg_config)) {
189                 ++pci_mmcfg_config_num;
190                 i -= sizeof(struct acpi_table_mcfg_config);
191         };
192         if (pci_mmcfg_config_num == 0) {
193                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
194                 return -ENODEV;
195         }
196
197         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
198         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
199         if (!pci_mmcfg_config) {
200                 printk(KERN_WARNING PREFIX
201                        "No memory for MCFG config tables\n");
202                 return -ENOMEM;
203         }
204
205         memcpy(pci_mmcfg_config, &mcfg->config, config_size);
206         for (i = 0; i < pci_mmcfg_config_num; ++i) {
207                 if (mcfg->config[i].base_reserved) {
208                         printk(KERN_ERR PREFIX
209                                "MMCONFIG not in low 4GB of memory\n");
210                         kfree(pci_mmcfg_config);
211                         pci_mmcfg_config_num = 0;
212                         return -ENODEV;
213                 }
214         }
215
216         return 0;
217 }
218 #endif                          /* CONFIG_PCI_MMCONFIG */
219
220 #ifdef CONFIG_X86_LOCAL_APIC
221 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
222 {
223         struct acpi_table_madt *madt = NULL;
224
225         if (!phys_addr || !size || !cpu_has_apic)
226                 return -EINVAL;
227
228         madt = (struct acpi_table_madt *)__acpi_map_table(phys_addr, size);
229         if (!madt) {
230                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
231                 return -ENODEV;
232         }
233
234         if (madt->lapic_address) {
235                 acpi_lapic_addr = (u64) madt->lapic_address;
236
237                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
238                        madt->lapic_address);
239         }
240
241         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
242
243         return 0;
244 }
245
246 static int __init
247 acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
248 {
249         struct acpi_table_lapic *processor = NULL;
250
251         processor = (struct acpi_table_lapic *)header;
252
253         if (BAD_MADT_ENTRY(processor, end))
254                 return -EINVAL;
255
256         acpi_table_print_madt_entry(header);
257
258         /* Record local apic id only when enabled */
259         if (processor->flags.enabled)
260                 x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
261
262         /*
263          * We need to register disabled CPU as well to permit
264          * counting disabled CPUs. This allows us to size
265          * cpus_possible_map more accurately, to permit
266          * to not preallocating memory for all NR_CPUS
267          * when we use CPU hotplug.
268          */
269         mp_register_lapic(processor->id,        /* APIC ID */
270                           processor->flags.enabled);    /* Enabled? */
271
272         return 0;
273 }
274
275 static int __init
276 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
277                           const unsigned long end)
278 {
279         struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
280
281         lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr *)header;
282
283         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
284                 return -EINVAL;
285
286         acpi_lapic_addr = lapic_addr_ovr->address;
287
288         return 0;
289 }
290
291 static int __init
292 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
293 {
294         struct acpi_table_lapic_nmi *lapic_nmi = NULL;
295
296         lapic_nmi = (struct acpi_table_lapic_nmi *)header;
297
298         if (BAD_MADT_ENTRY(lapic_nmi, end))
299                 return -EINVAL;
300
301         acpi_table_print_madt_entry(header);
302
303         if (lapic_nmi->lint != 1)
304                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
305
306         return 0;
307 }
308
309 #endif                          /*CONFIG_X86_LOCAL_APIC */
310
311 #ifdef CONFIG_X86_IO_APIC
312
313 static int __init
314 acpi_parse_ioapic(acpi_table_entry_header * header, const unsigned long end)
315 {
316         struct acpi_table_ioapic *ioapic = NULL;
317
318         ioapic = (struct acpi_table_ioapic *)header;
319
320         if (BAD_MADT_ENTRY(ioapic, end))
321                 return -EINVAL;
322
323         acpi_table_print_madt_entry(header);
324
325         mp_register_ioapic(ioapic->id,
326                            ioapic->address, ioapic->global_irq_base);
327
328         return 0;
329 }
330
331 /*
332  * Parse Interrupt Source Override for the ACPI SCI
333  */
334 static void acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
335 {
336         if (trigger == 0)       /* compatible SCI trigger is level */
337                 trigger = 3;
338
339         if (polarity == 0)      /* compatible SCI polarity is low */
340                 polarity = 3;
341
342         /* Command-line over-ride via acpi_sci= */
343         if (acpi_sci_flags.trigger)
344                 trigger = acpi_sci_flags.trigger;
345
346         if (acpi_sci_flags.polarity)
347                 polarity = acpi_sci_flags.polarity;
348
349         /*
350          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
351          * If GSI is < 16, this will update its flags,
352          * else it will create a new mp_irqs[] entry.
353          */
354         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
355
356         /*
357          * stash over-ride to indicate we've been here
358          * and for later update of acpi_fadt
359          */
360         acpi_sci_override_gsi = gsi;
361         return;
362 }
363
364 static int __init
365 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
366                        const unsigned long end)
367 {
368         struct acpi_table_int_src_ovr *intsrc = NULL;
369
370         intsrc = (struct acpi_table_int_src_ovr *)header;
371
372         if (BAD_MADT_ENTRY(intsrc, end))
373                 return -EINVAL;
374
375         acpi_table_print_madt_entry(header);
376
377         if (intsrc->bus_irq == acpi_fadt.sci_int) {
378                 acpi_sci_ioapic_setup(intsrc->global_irq,
379                                       intsrc->flags.polarity,
380                                       intsrc->flags.trigger);
381                 return 0;
382         }
383
384         if (acpi_skip_timer_override &&
385             intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
386                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
387                 return 0;
388         }
389
390         mp_override_legacy_irq(intsrc->bus_irq,
391                                intsrc->flags.polarity,
392                                intsrc->flags.trigger, intsrc->global_irq);
393
394         return 0;
395 }
396
397 static int __init
398 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
399 {
400         struct acpi_table_nmi_src *nmi_src = NULL;
401
402         nmi_src = (struct acpi_table_nmi_src *)header;
403
404         if (BAD_MADT_ENTRY(nmi_src, end))
405                 return -EINVAL;
406
407         acpi_table_print_madt_entry(header);
408
409         /* TBD: Support nimsrc entries? */
410
411         return 0;
412 }
413
414 #endif                          /* CONFIG_X86_IO_APIC */
415
416 /*
417  * acpi_pic_sci_set_trigger()
418  * 
419  * use ELCR to set PIC-mode trigger type for SCI
420  *
421  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
422  * it may require Edge Trigger -- use "acpi_sci=edge"
423  *
424  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
425  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
426  * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
427  * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
428  */
429
430 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
431 {
432         unsigned int mask = 1 << irq;
433         unsigned int old, new;
434
435         /* Real old ELCR mask */
436         old = inb(0x4d0) | (inb(0x4d1) << 8);
437
438         /*
439          * If we use ACPI to set PCI irq's, then we should clear ELCR
440          * since we will set it correctly as we enable the PCI irq
441          * routing.
442          */
443         new = acpi_noirq ? old : 0;
444
445         /*
446          * Update SCI information in the ELCR, it isn't in the PCI
447          * routing tables..
448          */
449         switch (trigger) {
450         case 1:         /* Edge - clear */
451                 new &= ~mask;
452                 break;
453         case 3:         /* Level - set */
454                 new |= mask;
455                 break;
456         }
457
458         if (old == new)
459                 return;
460
461         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
462         outb(new, 0x4d0);
463         outb(new >> 8, 0x4d1);
464 }
465
466 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
467 {
468 #ifdef CONFIG_X86_IO_APIC
469         if (use_pci_vector() && !platform_legacy_irq(gsi))
470                 *irq = IO_APIC_VECTOR(gsi);
471         else
472 #endif
473                 *irq = gsi_irq_sharing(gsi);
474         return 0;
475 }
476
477 /*
478  * success: return IRQ number (>=0)
479  * failure: return < 0
480  */
481 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
482 {
483         unsigned int irq;
484         unsigned int plat_gsi = gsi;
485
486 #ifdef CONFIG_PCI
487         /*
488          * Make sure all (legacy) PCI IRQs are set as level-triggered.
489          */
490         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
491                 extern void eisa_set_level_irq(unsigned int irq);
492
493                 if (triggering == ACPI_LEVEL_SENSITIVE)
494                         eisa_set_level_irq(gsi);
495         }
496 #endif
497
498 #ifdef CONFIG_X86_IO_APIC
499         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
500                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
501         }
502 #endif
503         acpi_gsi_to_irq(plat_gsi, &irq);
504         return irq;
505 }
506
507 EXPORT_SYMBOL(acpi_register_gsi);
508
509 /*
510  *  ACPI based hotplug support for CPU
511  */
512 #ifdef CONFIG_ACPI_HOTPLUG_CPU
513 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
514 {
515         /* TBD */
516         return -EINVAL;
517 }
518
519 EXPORT_SYMBOL(acpi_map_lsapic);
520
521 int acpi_unmap_lsapic(int cpu)
522 {
523         /* TBD */
524         return -EINVAL;
525 }
526
527 EXPORT_SYMBOL(acpi_unmap_lsapic);
528 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
529
530 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
531 {
532         /* TBD */
533         return -EINVAL;
534 }
535
536 EXPORT_SYMBOL(acpi_register_ioapic);
537
538 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
539 {
540         /* TBD */
541         return -EINVAL;
542 }
543
544 EXPORT_SYMBOL(acpi_unregister_ioapic);
545
546 static unsigned long __init
547 acpi_scan_rsdp(unsigned long start, unsigned long length)
548 {
549         unsigned long offset = 0;
550         unsigned long sig_len = sizeof("RSD PTR ") - 1;
551
552         /*
553          * Scan all 16-byte boundaries of the physical memory region for the
554          * RSDP signature.
555          */
556         for (offset = 0; offset < length; offset += 16) {
557                 if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
558                         continue;
559                 return (start + offset);
560         }
561
562         return 0;
563 }
564
565 static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
566 {
567         struct acpi_table_sbf *sb;
568
569         if (!phys_addr || !size)
570                 return -EINVAL;
571
572         sb = (struct acpi_table_sbf *)__acpi_map_table(phys_addr, size);
573         if (!sb) {
574                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
575                 return -ENODEV;
576         }
577
578         sbf_port = sb->sbf_cmos;        /* Save CMOS port */
579
580         return 0;
581 }
582
583 #ifdef CONFIG_HPET_TIMER
584
585 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
586 {
587         struct acpi_table_hpet *hpet_tbl;
588
589         if (!phys || !size)
590                 return -EINVAL;
591
592         hpet_tbl = (struct acpi_table_hpet *)__acpi_map_table(phys, size);
593         if (!hpet_tbl) {
594                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
595                 return -ENODEV;
596         }
597
598         if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
599                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
600                        "memory.\n");
601                 return -1;
602         }
603 #ifdef  CONFIG_X86_64
604         vxtime.hpet_address = hpet_tbl->addr.addrl |
605             ((long)hpet_tbl->addr.addrh << 32);
606
607         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
608                hpet_tbl->id, vxtime.hpet_address);
609 #else                           /* X86 */
610         {
611                 extern unsigned long hpet_address;
612
613                 hpet_address = hpet_tbl->addr.addrl;
614                 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
615                        hpet_tbl->id, hpet_address);
616         }
617 #endif                          /* X86 */
618
619         return 0;
620 }
621 #else
622 #define acpi_parse_hpet NULL
623 #endif
624
625 #ifdef CONFIG_X86_PM_TIMER
626 extern u32 pmtmr_ioport;
627 #endif
628
629 static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
630 {
631         struct fadt_descriptor *fadt = NULL;
632
633         fadt = (struct fadt_descriptor *)__acpi_map_table(phys, size);
634         if (!fadt) {
635                 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
636                 return 0;
637         }
638         /* initialize sci_int early for INT_SRC_OVR MADT parsing */
639         acpi_fadt.sci_int = fadt->sci_int;
640
641         /* initialize rev and apic_phys_dest_mode for x86_64 genapic */
642         acpi_fadt.revision = fadt->revision;
643         acpi_fadt.force_apic_physical_destination_mode =
644             fadt->force_apic_physical_destination_mode;
645
646 #ifdef CONFIG_X86_PM_TIMER
647         /* detect the location of the ACPI PM Timer */
648         if (fadt->revision >= FADT2_REVISION_ID) {
649                 /* FADT rev. 2 */
650                 if (fadt->xpm_tmr_blk.address_space_id !=
651                     ACPI_ADR_SPACE_SYSTEM_IO)
652                         return 0;
653
654                 pmtmr_ioport = fadt->xpm_tmr_blk.address;
655                 /*
656                  * "X" fields are optional extensions to the original V1.0
657                  * fields, so we must selectively expand V1.0 fields if the
658                  * corresponding X field is zero.
659                  */
660                 if (!pmtmr_ioport)
661                         pmtmr_ioport = fadt->V1_pm_tmr_blk;
662         } else {
663                 /* FADT rev. 1 */
664                 pmtmr_ioport = fadt->V1_pm_tmr_blk;
665         }
666         if (pmtmr_ioport)
667                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
668                        pmtmr_ioport);
669 #endif
670         return 0;
671 }
672
673 unsigned long __init acpi_find_rsdp(void)
674 {
675         unsigned long rsdp_phys = 0;
676
677         if (efi_enabled) {
678                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
679                         return efi.acpi20;
680                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
681                         return efi.acpi;
682         }
683         /*
684          * Scan memory looking for the RSDP signature. First search EBDA (low
685          * memory) paragraphs and then search upper memory (E0000-FFFFF).
686          */
687         rsdp_phys = acpi_scan_rsdp(0, 0x400);
688         if (!rsdp_phys)
689                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
690
691         return rsdp_phys;
692 }
693
694 #ifdef  CONFIG_X86_LOCAL_APIC
695 /*
696  * Parse LAPIC entries in MADT
697  * returns 0 on success, < 0 on error
698  */
699 static int __init acpi_parse_madt_lapic_entries(void)
700 {
701         int count;
702
703         if (!cpu_has_apic)
704                 return -ENODEV;
705
706         /* 
707          * Note that the LAPIC address is obtained from the MADT (32-bit value)
708          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
709          */
710
711         count =
712             acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR,
713                                   acpi_parse_lapic_addr_ovr, 0);
714         if (count < 0) {
715                 printk(KERN_ERR PREFIX
716                        "Error parsing LAPIC address override entry\n");
717                 return count;
718         }
719
720         mp_register_lapic_address(acpi_lapic_addr);
721
722         count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
723                                       MAX_APICS);
724         if (!count) {
725                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
726                 /* TBD: Cleanup to allow fallback to MPS */
727                 return -ENODEV;
728         } else if (count < 0) {
729                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
730                 /* TBD: Cleanup to allow fallback to MPS */
731                 return count;
732         }
733
734         count =
735             acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
736         if (count < 0) {
737                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
738                 /* TBD: Cleanup to allow fallback to MPS */
739                 return count;
740         }
741         return 0;
742 }
743 #endif                          /* CONFIG_X86_LOCAL_APIC */
744
745 #ifdef  CONFIG_X86_IO_APIC
746 /*
747  * Parse IOAPIC related entries in MADT
748  * returns 0 on success, < 0 on error
749  */
750 static int __init acpi_parse_madt_ioapic_entries(void)
751 {
752         int count;
753
754         /*
755          * ACPI interpreter is required to complete interrupt setup,
756          * so if it is off, don't enumerate the io-apics with ACPI.
757          * If MPS is present, it will handle them,
758          * otherwise the system will stay in PIC mode
759          */
760         if (acpi_disabled || acpi_noirq) {
761                 return -ENODEV;
762         }
763
764         if (!cpu_has_apic) 
765                 return -ENODEV;
766
767         /*
768          * if "noapic" boot option, don't look for IO-APICs
769          */
770         if (skip_ioapic_setup) {
771                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
772                        "due to 'noapic' option.\n");
773                 return -ENODEV;
774         }
775
776         count =
777             acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic,
778                                   MAX_IO_APICS);
779         if (!count) {
780                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
781                 return -ENODEV;
782         } else if (count < 0) {
783                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
784                 return count;
785         }
786
787         count =
788             acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr,
789                                   NR_IRQ_VECTORS);
790         if (count < 0) {
791                 printk(KERN_ERR PREFIX
792                        "Error parsing interrupt source overrides entry\n");
793                 /* TBD: Cleanup to allow fallback to MPS */
794                 return count;
795         }
796
797         /*
798          * If BIOS did not supply an INT_SRC_OVR for the SCI
799          * pretend we got one so we can set the SCI flags.
800          */
801         if (!acpi_sci_override_gsi)
802                 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
803
804         /* Fill in identity legacy mapings where no override */
805         mp_config_acpi_legacy_irqs();
806
807         count =
808             acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src,
809                                   NR_IRQ_VECTORS);
810         if (count < 0) {
811                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
812                 /* TBD: Cleanup to allow fallback to MPS */
813                 return count;
814         }
815
816         return 0;
817 }
818 #else
819 static inline int acpi_parse_madt_ioapic_entries(void)
820 {
821         return -1;
822 }
823 #endif  /* !CONFIG_X86_IO_APIC */
824
825 static void __init acpi_process_madt(void)
826 {
827 #ifdef CONFIG_X86_LOCAL_APIC
828         int count, error;
829
830         count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
831         if (count >= 1) {
832
833                 /*
834                  * Parse MADT LAPIC entries
835                  */
836                 error = acpi_parse_madt_lapic_entries();
837                 if (!error) {
838                         acpi_lapic = 1;
839
840 #ifdef CONFIG_X86_GENERICARCH
841                         generic_bigsmp_probe();
842 #endif
843                         /*
844                          * Parse MADT IO-APIC entries
845                          */
846                         error = acpi_parse_madt_ioapic_entries();
847                         if (!error) {
848                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
849                                 acpi_irq_balance_set(NULL);
850                                 acpi_ioapic = 1;
851
852                                 smp_found_config = 1;
853                                 clustered_apic_check();
854                         }
855                 }
856                 if (error == -EINVAL) {
857                         /*
858                          * Dell Precision Workstation 410, 610 come here.
859                          */
860                         printk(KERN_ERR PREFIX
861                                "Invalid BIOS MADT, disabling ACPI\n");
862                         disable_acpi();
863                 }
864         }
865 #endif
866         return;
867 }
868
869 #ifdef __i386__
870
871 static int __init disable_acpi_irq(struct dmi_system_id *d)
872 {
873         if (!acpi_force) {
874                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
875                        d->ident);
876                 acpi_noirq_set();
877         }
878         return 0;
879 }
880
881 static int __init disable_acpi_pci(struct dmi_system_id *d)
882 {
883         if (!acpi_force) {
884                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
885                        d->ident);
886                 acpi_disable_pci();
887         }
888         return 0;
889 }
890
891 static int __init dmi_disable_acpi(struct dmi_system_id *d)
892 {
893         if (!acpi_force) {
894                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
895                 disable_acpi();
896         } else {
897                 printk(KERN_NOTICE
898                        "Warning: DMI blacklist says broken, but acpi forced\n");
899         }
900         return 0;
901 }
902
903 /*
904  * Limit ACPI to CPU enumeration for HT
905  */
906 static int __init force_acpi_ht(struct dmi_system_id *d)
907 {
908         if (!acpi_force) {
909                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
910                        d->ident);
911                 disable_acpi();
912                 acpi_ht = 1;
913         } else {
914                 printk(KERN_NOTICE
915                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
916         }
917         return 0;
918 }
919
920 /*
921  * If your system is blacklisted here, but you find that acpi=force
922  * works for you, please contact acpi-devel@sourceforge.net
923  */
924 static struct dmi_system_id __initdata acpi_dmi_table[] = {
925         /*
926          * Boxes that need ACPI disabled
927          */
928         {
929          .callback = dmi_disable_acpi,
930          .ident = "IBM Thinkpad",
931          .matches = {
932                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
933                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
934                      },
935          },
936
937         /*
938          * Boxes that need acpi=ht
939          */
940         {
941          .callback = force_acpi_ht,
942          .ident = "FSC Primergy T850",
943          .matches = {
944                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
945                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
946                      },
947          },
948         {
949          .callback = force_acpi_ht,
950          .ident = "DELL GX240",
951          .matches = {
952                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
953                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
954                      },
955          },
956         {
957          .callback = force_acpi_ht,
958          .ident = "HP VISUALIZE NT Workstation",
959          .matches = {
960                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
961                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
962                      },
963          },
964         {
965          .callback = force_acpi_ht,
966          .ident = "Compaq Workstation W8000",
967          .matches = {
968                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
969                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
970                      },
971          },
972         {
973          .callback = force_acpi_ht,
974          .ident = "ASUS P4B266",
975          .matches = {
976                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
977                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
978                      },
979          },
980         {
981          .callback = force_acpi_ht,
982          .ident = "ASUS P2B-DS",
983          .matches = {
984                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
985                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
986                      },
987          },
988         {
989          .callback = force_acpi_ht,
990          .ident = "ASUS CUR-DLS",
991          .matches = {
992                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
993                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
994                      },
995          },
996         {
997          .callback = force_acpi_ht,
998          .ident = "ABIT i440BX-W83977",
999          .matches = {
1000                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1001                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1002                      },
1003          },
1004         {
1005          .callback = force_acpi_ht,
1006          .ident = "IBM Bladecenter",
1007          .matches = {
1008                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1009                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1010                      },
1011          },
1012         {
1013          .callback = force_acpi_ht,
1014          .ident = "IBM eServer xSeries 360",
1015          .matches = {
1016                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1017                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1018                      },
1019          },
1020         {
1021          .callback = force_acpi_ht,
1022          .ident = "IBM eserver xSeries 330",
1023          .matches = {
1024                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1025                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1026                      },
1027          },
1028         {
1029          .callback = force_acpi_ht,
1030          .ident = "IBM eserver xSeries 440",
1031          .matches = {
1032                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1033                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1034                      },
1035          },
1036
1037         /*
1038          * Boxes that need ACPI PCI IRQ routing disabled
1039          */
1040         {
1041          .callback = disable_acpi_irq,
1042          .ident = "ASUS A7V",
1043          .matches = {
1044                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1045                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1046                      /* newer BIOS, Revision 1011, does work */
1047                      DMI_MATCH(DMI_BIOS_VERSION,
1048                                "ASUS A7V ACPI BIOS Revision 1007"),
1049                      },
1050          },
1051
1052         /*
1053          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1054          */
1055         {                       /* _BBN 0 bug */
1056          .callback = disable_acpi_pci,
1057          .ident = "ASUS PR-DLS",
1058          .matches = {
1059                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1060                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1061                      DMI_MATCH(DMI_BIOS_VERSION,
1062                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1063                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1064                      },
1065          },
1066         {
1067          .callback = disable_acpi_pci,
1068          .ident = "Acer TravelMate 36x Laptop",
1069          .matches = {
1070                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1071                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1072                      },
1073          },
1074         {}
1075 };
1076
1077 #endif                          /* __i386__ */
1078
1079 /*
1080  * acpi_boot_table_init() and acpi_boot_init()
1081  *  called from setup_arch(), always.
1082  *      1. checksums all tables
1083  *      2. enumerates lapics
1084  *      3. enumerates io-apics
1085  *
1086  * acpi_table_init() is separate to allow reading SRAT without
1087  * other side effects.
1088  *
1089  * side effects of acpi_boot_init:
1090  *      acpi_lapic = 1 if LAPIC found
1091  *      acpi_ioapic = 1 if IOAPIC found
1092  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1093  *      if acpi_blacklisted() acpi_disabled = 1;
1094  *      acpi_irq_model=...
1095  *      ...
1096  *
1097  * return value: (currently ignored)
1098  *      0: success
1099  *      !0: failure
1100  */
1101
1102 int __init acpi_boot_table_init(void)
1103 {
1104         int error;
1105
1106 #ifdef __i386__
1107         dmi_check_system(acpi_dmi_table);
1108 #endif
1109
1110         /*
1111          * If acpi_disabled, bail out
1112          * One exception: acpi=ht continues far enough to enumerate LAPICs
1113          */
1114         if (acpi_disabled && !acpi_ht)
1115                 return 1;
1116
1117         /* 
1118          * Initialize the ACPI boot-time table parser.
1119          */
1120         error = acpi_table_init();
1121         if (error) {
1122                 disable_acpi();
1123                 return error;
1124         }
1125
1126         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1127
1128         /*
1129          * blacklist may disable ACPI entirely
1130          */
1131         error = acpi_blacklisted();
1132         if (error) {
1133                 if (acpi_force) {
1134                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1135                 } else {
1136                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1137                         disable_acpi();
1138                         return error;
1139                 }
1140         }
1141
1142         return 0;
1143 }
1144
1145 int __init acpi_boot_init(void)
1146 {
1147         /*
1148          * If acpi_disabled, bail out
1149          * One exception: acpi=ht continues far enough to enumerate LAPICs
1150          */
1151         if (acpi_disabled && !acpi_ht)
1152                 return 1;
1153
1154         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1155
1156         /*
1157          * set sci_int and PM timer address
1158          */
1159         acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
1160
1161         /*
1162          * Process the Multiple APIC Description Table (MADT), if present
1163          */
1164         acpi_process_madt();
1165
1166         acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
1167
1168         return 0;
1169 }
1170
1171 static int __init parse_acpi(char *arg)
1172 {
1173         if (!arg)
1174                 return -EINVAL;
1175
1176         /* "acpi=off" disables both ACPI table parsing and interpreter */
1177         if (strcmp(arg, "off") == 0) {
1178                 disable_acpi();
1179         }
1180         /* acpi=force to over-ride black-list */
1181         else if (strcmp(arg, "force") == 0) {
1182                 acpi_force = 1;
1183                 acpi_ht = 1;
1184                 acpi_disabled = 0;
1185         }
1186         /* acpi=strict disables out-of-spec workarounds */
1187         else if (strcmp(arg, "strict") == 0) {
1188                 acpi_strict = 1;
1189         }
1190         /* Limit ACPI just to boot-time to enable HT */
1191         else if (strcmp(arg, "ht") == 0) {
1192                 if (!acpi_force)
1193                         disable_acpi();
1194                 acpi_ht = 1;
1195         }
1196         /* "acpi=noirq" disables ACPI interrupt routing */
1197         else if (strcmp(arg, "noirq") == 0) {
1198                 acpi_noirq_set();
1199         } else {
1200                 /* Core will printk when we return error. */
1201                 return -EINVAL;
1202         }
1203         return 0;
1204 }
1205 early_param("acpi", parse_acpi);
1206
1207 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1208 static int __init parse_pci(char *arg)
1209 {
1210         if (arg && strcmp(arg, "noacpi") == 0)
1211                 acpi_disable_pci();
1212         return 0;
1213 }
1214 early_param("pci", parse_pci);
1215
1216 #ifdef CONFIG_X86_IO_APIC
1217 static int __init parse_acpi_skip_timer_override(char *arg)
1218 {
1219         acpi_skip_timer_override = 1;
1220         return 0;
1221 }
1222 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1223 #endif /* CONFIG_X86_IO_APIC */
1224
1225 static int __init setup_acpi_sci(char *s)
1226 {
1227         if (!s)
1228                 return -EINVAL;
1229         if (!strcmp(s, "edge"))
1230                 acpi_sci_flags.trigger = 1;
1231         else if (!strcmp(s, "level"))
1232                 acpi_sci_flags.trigger = 3;
1233         else if (!strcmp(s, "high"))
1234                 acpi_sci_flags.polarity = 1;
1235         else if (!strcmp(s, "low"))
1236                 acpi_sci_flags.polarity = 3;
1237         else
1238                 return -EINVAL;
1239         return 0;
1240 }
1241 early_param("acpi_sci", setup_acpi_sci);