1 /*
2 * acpi.c - Architecture-Specific Low-Level ACPI 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 * Copyright (C) 2001 Patrick Mochel <mochel@osdl.org>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/config.h>
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/stddef.h>
32 #include <linux/slab.h>
33 #include <linux/pci.h>
34 #include <linux/bootmem.h>
35 #include <linux/irq.h>
36 #include <linux/acpi.h>
37 #include <asm/mpspec.h>
38 #include <asm/io.h>
39 #include <asm/apic.h>
40 #include <asm/apicdef.h>
41 #include <asm/page.h>
42 #include <asm/pgtable.h>
43 #include <asm/pgalloc.h>
44 #include <asm/io_apic.h>
45 #include <asm/acpi.h>
46 #include <asm/save_state.h>
47 #include <asm/smpboot.h>
48
49
50 #define PREFIX "ACPI: "
51
52 int acpi_lapic;
53 int acpi_ioapic;
54 int acpi_strict;
55
56 acpi_interrupt_flags acpi_sci_flags __initdata;
57 int acpi_sci_override_gsi __initdata;
58 int acpi_skip_timer_override __initdata;
59 /* --------------------------------------------------------------------------
60 Boot-time Configuration
61 -------------------------------------------------------------------------- */
62
63 #ifdef CONFIG_ACPI_PCI
64 int acpi_noirq __initdata; /* skip ACPI IRQ initialization */
65 int acpi_pci_disabled __initdata; /* skip ACPI PCI scan and IRQ initialization */
66 #endif
67 int acpi_ht __initdata = 1; /* enable HT */
68
69 enum acpi_irq_model_id acpi_irq_model;
70
71
72 /*
73 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
74 * to map the target physical address. The problem is that set_fixmap()
75 * provides a single page, and it is possible that the page is not
76 * sufficient.
77 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
78 * i.e. until the next __va_range() call.
79 *
80 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
81 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
82 * count idx down while incrementing the phys address.
83 */
__acpi_map_table(unsigned long phys,unsigned long size)84 char *__acpi_map_table(unsigned long phys, unsigned long size)
85 {
86 unsigned long base, offset, mapped_size;
87 int idx;
88
89 if (phys + size < 8*1024*1024)
90 return __va(phys);
91
92 offset = phys & (PAGE_SIZE - 1);
93 mapped_size = PAGE_SIZE - offset;
94 set_fixmap(FIX_ACPI_END, phys);
95 base = fix_to_virt(FIX_ACPI_END);
96
97 /*
98 * Most cases can be covered by the below.
99 */
100 idx = FIX_ACPI_END;
101 while (mapped_size < size) {
102 if (--idx < FIX_ACPI_BEGIN)
103 return 0; /* cannot handle this */
104 phys += PAGE_SIZE;
105 set_fixmap(idx, phys);
106 mapped_size += PAGE_SIZE;
107 }
108
109 return ((unsigned char *) base + offset);
110 }
111
112 #ifdef CONFIG_ACPI_MMCONFIG
113
114 u32 pci_mmcfg_base_addr;
115
116 static int __init
acpi_parse_mcfg(unsigned long phys_addr,unsigned long size)117 acpi_parse_mcfg(unsigned long phys_addr,
118 unsigned long size)
119 {
120 struct acpi_table_mcfg *mcfg = NULL;
121
122 if (!phys_addr || !size)
123 return -EINVAL;
124
125 mcfg = (struct acpi_table_mcfg *) __acpi_map_table(phys_addr, size);
126 if (!mcfg) {
127 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
128 return -ENODEV;
129 }
130
131 if (mcfg->base_reserved) {
132 printk(KERN_ERR PREFIX "MMCONFIG not in low 4GB of memory\n");
133 return -ENODEV;
134 }
135
136 pci_mmcfg_base_addr = mcfg->base_address;
137
138 return 0;
139 }
140 #endif /* CONFIG_ACPI_MMCONFIG */
141
142 #ifdef CONFIG_X86_LOCAL_APIC
143
144 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
145
146
147 static int __init
acpi_parse_madt(unsigned long phys_addr,unsigned long size)148 acpi_parse_madt (
149 unsigned long phys_addr,
150 unsigned long size)
151 {
152 struct acpi_table_madt *madt = NULL;
153
154 if (!phys_addr || !size)
155 return -EINVAL;
156
157 madt = (struct acpi_table_madt *) __acpi_map_table(phys_addr, size);
158 if (!madt) {
159 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
160 return -ENODEV;
161 }
162
163 if (madt->lapic_address)
164 acpi_lapic_addr = (u64) madt->lapic_address;
165
166 printk(KERN_INFO PREFIX "Local APIC address 0x%08x\n",
167 madt->lapic_address);
168
169 detect_clustered_apic(madt->header.oem_id, madt->header.oem_table_id);
170
171 return 0;
172 }
173
174
175 static int __init
acpi_parse_lapic(acpi_table_entry_header * header)176 acpi_parse_lapic (
177 acpi_table_entry_header *header)
178 {
179 struct acpi_table_lapic *processor = NULL;
180
181 processor = (struct acpi_table_lapic*) header;
182 if (!processor)
183 return -EINVAL;
184
185 acpi_table_print_madt_entry(header);
186
187 mp_register_lapic (
188 processor->id, /* APIC ID */
189 processor->flags.enabled); /* Enabled? */
190
191 return 0;
192 }
193
194
195 static int __init
acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header)196 acpi_parse_lapic_addr_ovr (
197 acpi_table_entry_header *header)
198 {
199 struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
200
201 lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr*) header;
202 if (!lapic_addr_ovr)
203 return -EINVAL;
204
205 acpi_lapic_addr = lapic_addr_ovr->address;
206
207 return 0;
208 }
209
210 static int __init
acpi_parse_lapic_nmi(acpi_table_entry_header * header)211 acpi_parse_lapic_nmi (
212 acpi_table_entry_header *header)
213 {
214 struct acpi_table_lapic_nmi *lapic_nmi = NULL;
215
216 lapic_nmi = (struct acpi_table_lapic_nmi*) header;
217 if (!lapic_nmi)
218 return -EINVAL;
219
220 acpi_table_print_madt_entry(header);
221
222 if (lapic_nmi->lint != 1)
223 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
224
225 return 0;
226 }
227
228 #endif /*CONFIG_X86_LOCAL_APIC*/
229
230 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
231
232 static int __init
acpi_parse_ioapic(acpi_table_entry_header * header)233 acpi_parse_ioapic (
234 acpi_table_entry_header *header)
235 {
236 struct acpi_table_ioapic *ioapic = NULL;
237
238 ioapic = (struct acpi_table_ioapic*) header;
239 if (!ioapic)
240 return -EINVAL;
241
242 acpi_table_print_madt_entry(header);
243
244 mp_register_ioapic (
245 ioapic->id,
246 ioapic->address,
247 ioapic->global_irq_base);
248
249 return 0;
250 }
251
252 /*
253 * Parse Interrupt Source Override for the ACPI SCI
254 */
255 static void
acpi_sci_ioapic_setup(u32 gsi,u16 polarity,u16 trigger)256 acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
257 {
258 if (trigger == 0) /* compatible SCI trigger is level */
259 trigger = 3;
260
261 if (polarity == 0) /* compatible SCI polarity is low */
262 polarity = 3;
263
264 /* Command-line over-ride via acpi_sci= */
265 if (acpi_sci_flags.trigger)
266 trigger = acpi_sci_flags.trigger;
267
268 if (acpi_sci_flags.polarity)
269 polarity = acpi_sci_flags.polarity;
270
271 /*
272 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
273 * If GSI is < 16, this will update its flags,
274 * else it will create a new mp_irqs[] entry.
275 */
276 mp_override_legacy_irq(gsi, polarity, trigger, gsi);
277
278 /*
279 * stash over-ride to indicate we've been here
280 * and for later update of acpi_fadt
281 */
282 acpi_sci_override_gsi = gsi;
283 return;
284 }
285
286 static int __init
acpi_parse_fadt(unsigned long phys,unsigned long size)287 acpi_parse_fadt(unsigned long phys, unsigned long size)
288 {
289 struct fadt_descriptor_rev2 *fadt =0;
290
291 fadt = (struct fadt_descriptor_rev2*) __acpi_map_table(phys,size);
292 if (!fadt) {
293 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
294 return 0;
295 }
296
297 #ifdef CONFIG_ACPI_INTERPRETER
298 /* initialize sci_int early for INT_SRC_OVR MADT parsing */
299 acpi_fadt.sci_int = fadt->sci_int;
300 #endif
301
302 return 0;
303 }
304
305
306 static int __init
acpi_parse_int_src_ovr(acpi_table_entry_header * header)307 acpi_parse_int_src_ovr (
308 acpi_table_entry_header *header)
309 {
310 struct acpi_table_int_src_ovr *intsrc = NULL;
311
312 intsrc = (struct acpi_table_int_src_ovr*) header;
313 if (!intsrc)
314 return -EINVAL;
315
316 acpi_table_print_madt_entry(header);
317
318 if (intsrc->bus_irq == acpi_fadt.sci_int) {
319 acpi_sci_ioapic_setup(intsrc->global_irq,
320 intsrc->flags.polarity, intsrc->flags.trigger);
321 return 0;
322 }
323
324 if (acpi_skip_timer_override &&
325 intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
326 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
327 return 0;
328 }
329
330 mp_override_legacy_irq (
331 intsrc->bus_irq,
332 intsrc->flags.polarity,
333 intsrc->flags.trigger,
334 intsrc->global_irq);
335
336 return 0;
337 }
338
339
340 static int __init
acpi_parse_nmi_src(acpi_table_entry_header * header)341 acpi_parse_nmi_src (
342 acpi_table_entry_header *header)
343 {
344 struct acpi_table_nmi_src *nmi_src = NULL;
345
346 nmi_src = (struct acpi_table_nmi_src*) header;
347 if (!nmi_src)
348 return -EINVAL;
349
350 acpi_table_print_madt_entry(header);
351
352 /* TBD: Support nimsrc entries? */
353
354 return 0;
355 }
356
357 #endif /*CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER*/
358
359
360 static unsigned long __init
acpi_scan_rsdp(unsigned long start,unsigned long length)361 acpi_scan_rsdp (
362 unsigned long start,
363 unsigned long length)
364 {
365 unsigned long offset = 0;
366 unsigned long sig_len = sizeof("RSD PTR ") - 1;
367
368 /*
369 * Scan all 16-byte boundaries of the physical memory region for the
370 * RSDP signature.
371 */
372 for (offset = 0; offset < length; offset += 16) {
373 if (strncmp((char *) (start + offset), "RSD PTR ", sig_len))
374 continue;
375 return (start + offset);
376 }
377
378 return 0;
379 }
380
381
382 unsigned long __init
acpi_find_rsdp(void)383 acpi_find_rsdp (void)
384 {
385 unsigned long rsdp_phys = 0;
386
387 /*
388 * Scan memory looking for the RSDP signature. First search EBDA (low
389 * memory) paragraphs and then search upper memory (E0000-FFFFF).
390 */
391 rsdp_phys = acpi_scan_rsdp (0, 0x400);
392 if (!rsdp_phys)
393 rsdp_phys = acpi_scan_rsdp (0xE0000, 0xFFFFF);
394
395 return rsdp_phys;
396 }
397
398
399 extern int mp_irqs_alloc(void);
400
401 /*
402 * acpi_boot_init()
403 * called from setup_arch(), always.
404 * 1. maps ACPI tables for later use
405 * 2. enumerates lapics
406 * 3. enumerates io-apics
407 *
408 * side effects:
409 * acpi_lapic = 1 if LAPIC found
410 * acpi_ioapic = 1 if IOAPIC found
411 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
412 * if acpi_blacklisted() disable_acpi()
413 * acpi_irq_model=...
414 * ...
415 *
416 * return value: (currently ignored)
417 * 0: success
418 * !0: failure
419 */
420 int __init
acpi_boot_init(void)421 acpi_boot_init (void)
422 {
423 int result = 0;
424
425 if (acpi_disabled && !acpi_ht)
426 return(1);
427
428 /*
429 * The default interrupt routing model is PIC (8259). This gets
430 * overriden if IOAPICs are enumerated (below).
431 */
432 acpi_irq_model = ACPI_IRQ_MODEL_PIC;
433
434 /*
435 * Initialize the ACPI boot-time table parser.
436 */
437 result = acpi_table_init();
438 if (result) {
439 disable_acpi();
440 return result;
441 }
442
443 #ifdef CONFIG_X86_IO_APIC
444 check_acpi_pci();
445 #endif
446
447 result = acpi_blacklisted();
448 if (result) {
449 printk(KERN_NOTICE PREFIX "BIOS listed in blacklist, disabling ACPI support\n");
450 disable_acpi();
451 return result;
452 }
453
454 #ifdef CONFIG_ACPI_MMCONFIG
455 result = acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
456 if (result < 0) {
457 printk(KERN_ERR PREFIX "Error %d parsing MCFG\n", result);
458 } else if (result > 1) {
459 printk(KERN_WARNING PREFIX "Multiple MCFG tables exist\n");
460 }
461 #endif
462
463 #ifdef CONFIG_X86_LOCAL_APIC
464
465 /*
466 * MADT
467 * ----
468 * Parse the Multiple APIC Description Table (MADT), if exists.
469 * Note that this table provides platform SMP configuration
470 * information -- the successor to MPS tables.
471 */
472
473 result = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
474 if (!result) {
475 return 0;
476 }
477 else if (result < 0) {
478 printk(KERN_ERR PREFIX "Error parsing MADT\n");
479 return result;
480 }
481 else if (result > 1)
482 printk(KERN_WARNING PREFIX "Multiple MADT tables exist\n");
483
484 /*
485 * Local APIC
486 * ----------
487 * Note that the LAPIC address is obtained from the MADT (32-bit value)
488 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
489 */
490
491 result = acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR, acpi_parse_lapic_addr_ovr);
492 if (result < 0) {
493 printk(KERN_ERR PREFIX "Error parsing LAPIC address override entry\n");
494 return result;
495 }
496
497 mp_register_lapic_address(acpi_lapic_addr);
498
499 result = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic);
500 if (!result) {
501 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
502 /* TBD: Cleanup to allow fallback to MPS */
503 return -ENODEV;
504 }
505 else if (result < 0) {
506 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
507 /* TBD: Cleanup to allow fallback to MPS */
508 return result;
509 }
510
511 result = acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi);
512 if (result < 0) {
513 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
514 /* TBD: Cleanup to allow fallback to MPS */
515 return result;
516 }
517
518 acpi_lapic = 1;
519
520 #endif /*CONFIG_X86_LOCAL_APIC*/
521
522 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
523
524 /*
525 * I/O APIC
526 * --------
527 */
528
529 /*
530 * ACPI interpreter is required to complete interrupt setup,
531 * so if it is off, don't enumerate the io-apics with ACPI.
532 * If MPS is present, it will handle them,
533 * otherwise the system will stay in PIC mode
534 */
535 if (acpi_disabled || acpi_noirq) {
536 return 1;
537 }
538
539 /*
540 * if "noapic" boot option, don't look for IO-APICs
541 */
542 if (ioapic_setup_disabled()) {
543 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
544 "due to 'noapic' option.\n");
545 return 1;
546 }
547
548 result = mp_irqs_alloc(); /* Dynamically allocate mp_irqs[] */
549 if (result < 0) {
550 acpi_noirq = 1;
551 return result;
552 }
553
554 result = acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic);
555 if (!result) {
556 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
557 return -ENODEV;
558 }
559 else if (result < 0) {
560 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
561 return result;
562 }
563
564 /* Record sci_int for use when looking for MADT sci_int override */
565 acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
566
567 result = acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr);
568 if (result < 0) {
569 printk(KERN_ERR PREFIX "Error parsing interrupt source overrides entry\n");
570 /* TBD: Cleanup to allow fallback to MPS */
571 return result;
572 }
573
574 /*
575 * If BIOS did not supply an INT_SRC_OVR for the SCI
576 * pretend we got one so we can set the SCI flags.
577 */
578 if (!acpi_sci_override_gsi)
579 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
580
581 /* Fill in identity legacy mapings where no override */
582 mp_config_acpi_legacy_irqs();
583
584 result = acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src);
585 if (result < 0) {
586 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
587 /* TBD: Cleanup to allow fallback to MPS */
588 return result;
589 }
590
591 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
592
593 acpi_irq_balance_set(NULL);
594
595 acpi_ioapic = 1;
596
597 if (acpi_lapic && acpi_ioapic)
598 smp_found_config = 1;
599
600 #endif /*CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER*/
601
602 return 0;
603 }
604
605
606 #ifdef CONFIG_ACPI_BUS
607 /*
608 * acpi_pic_sci_set_trigger()
609 *
610 * use ELCR to set PIC-mode trigger type for SCI
611 *
612 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
613 * it may require Edge Trigger -- use "acpi_sci=edge"
614 *
615 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
616 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
617 * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
618 * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
619 */
620
621 void __init
acpi_pic_sci_set_trigger(unsigned int irq,u16 trigger)622 acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
623 {
624 unsigned char mask = 1 << (irq & 7);
625 unsigned int port = 0x4d0 + (irq >> 3);
626 unsigned char val = inb(port);
627
628
629 printk(PREFIX "IRQ%d SCI:", irq);
630 if (!(val & mask)) {
631 printk(" Edge");
632
633 if (trigger == 3) {
634 printk(" set to Level");
635 outb(val | mask, port);
636 }
637 } else {
638 printk(" Level");
639
640 if (trigger == 1) {
641 printk(" set to Edge");
642 outb(val & ~mask, port);
643 }
644 }
645 printk(" Trigger.\n");
646 }
647
648 #endif /* CONFIG_ACPI_BUS */
649
650
651
652 #ifndef __HAVE_ARCH_CMPXCHG
653 #warning ACPI uses CMPXCHG, i486 and later hardware
654 #endif
655
656 /* --------------------------------------------------------------------------
657 Low-Level Sleep Support
658 -------------------------------------------------------------------------- */
659
660 #ifdef CONFIG_ACPI_SLEEP
661
662 #define DEBUG
663
664 #ifdef DEBUG
665 #include <linux/serial.h>
666 #endif
667
668 /* address in low memory of the wakeup routine. */
669 unsigned long acpi_wakeup_address = 0;
670
671 /* new page directory that we will be using */
672 static pmd_t *pmd;
673
674 /* saved page directory */
675 static pmd_t saved_pmd;
676
677 /* page which we'll use for the new page directory */
678 static pte_t *ptep;
679
680 extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));
681
682 /*
683 * acpi_create_identity_pmd
684 *
685 * Create a new, identity mapped pmd.
686 *
687 * Do this by creating new page directory, and marking all the pages as R/W
688 * Then set it as the new Page Middle Directory.
689 * And, of course, flush the TLB so it takes effect.
690 *
691 * We save the address of the old one, for later restoration.
692 */
acpi_create_identity_pmd(void)693 static void acpi_create_identity_pmd (void)
694 {
695 pgd_t *pgd;
696 int i;
697
698 ptep = (pte_t*)__get_free_page(GFP_KERNEL);
699
700 /* fill page with low mapping */
701 for (i = 0; i < PTRS_PER_PTE; i++)
702 set_pte(ptep + i, mk_pte_phys(i << PAGE_SHIFT, PAGE_SHARED));
703
704 pgd = pgd_offset(current->active_mm, 0);
705 pmd = pmd_alloc(current->mm,pgd, 0);
706
707 /* save the old pmd */
708 saved_pmd = *pmd;
709
710 /* set the new one */
711 set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(ptep)));
712
713 /* flush the TLB */
714 local_flush_tlb();
715 }
716
717 /*
718 * acpi_restore_pmd
719 *
720 * Restore the old pmd saved by acpi_create_identity_pmd and
721 * free the page that said function alloc'd
722 */
acpi_restore_pmd(void)723 static void acpi_restore_pmd (void)
724 {
725 set_pmd(pmd, saved_pmd);
726 local_flush_tlb();
727 free_page((unsigned long)ptep);
728 }
729
730 /**
731 * acpi_save_state_mem - save kernel state
732 *
733 * Create an identity mapped page table and copy the wakeup routine to
734 * low memory.
735 */
acpi_save_state_mem(void)736 int acpi_save_state_mem (void)
737 {
738 acpi_create_identity_pmd();
739 acpi_copy_wakeup_routine(acpi_wakeup_address);
740
741 return 0;
742 }
743
744 /**
745 * acpi_save_state_disk - save kernel state to disk
746 *
747 */
acpi_save_state_disk(void)748 int acpi_save_state_disk (void)
749 {
750 return 1;
751 }
752
753 /*
754 * acpi_restore_state
755 */
acpi_restore_state_mem(void)756 void acpi_restore_state_mem (void)
757 {
758 acpi_restore_pmd();
759 }
760
761 /**
762 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
763 *
764 * We allocate a page in low memory for the wakeup
765 * routine for when we come back from a sleep state. The
766 * runtime allocator allows specification of <16M pages, but not
767 * <1M pages.
768 */
acpi_reserve_bootmem(void)769 void __init acpi_reserve_bootmem(void)
770 {
771 acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
772 if (!acpi_wakeup_address)
773 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
774 }
775
do_suspend_lowlevel_s4bios(int resume)776 void do_suspend_lowlevel_s4bios(int resume)
777 {
778 if (!resume) {
779 save_processor_context();
780 acpi_save_register_state((unsigned long)&&acpi_sleep_done);
781 acpi_enter_sleep_state_s4bios();
782 return;
783 }
784 acpi_sleep_done:
785 restore_processor_context();
786 }
787
788
789 #endif /*CONFIG_ACPI_SLEEP*/
790
791