Merge branch 'stable/for-x86-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel...
[~shefty/rdma-dev.git] / drivers / acpi / osl.c
1 /*
2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3  *
4  *  Copyright (C) 2000       Andrew Henroid
5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7  *  Copyright (c) 2008 Intel Corporation
8  *   Author: Matthew Wilcox <willy@linux.intel.com>
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  *
12  *  This program is free software; you can redistribute it and/or modify
13  *  it under the terms of the GNU General Public License as published by
14  *  the Free Software Foundation; either version 2 of the License, or
15  *  (at your option) any later version.
16  *
17  *  This program is distributed in the hope that it will be useful,
18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  *  GNU General Public License for more details.
21  *
22  *  You should have received a copy of the GNU General Public License
23  *  along with this program; if not, write to the Free Software
24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
25  *
26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27  *
28  */
29
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/highmem.h>
35 #include <linux/pci.h>
36 #include <linux/interrupt.h>
37 #include <linux/kmod.h>
38 #include <linux/delay.h>
39 #include <linux/workqueue.h>
40 #include <linux/nmi.h>
41 #include <linux/acpi.h>
42 #include <linux/acpi_io.h>
43 #include <linux/efi.h>
44 #include <linux/ioport.h>
45 #include <linux/list.h>
46 #include <linux/jiffies.h>
47 #include <linux/semaphore.h>
48
49 #include <asm/io.h>
50 #include <asm/uaccess.h>
51
52 #include <acpi/acpi.h>
53 #include <acpi/acpi_bus.h>
54 #include <acpi/processor.h>
55
56 #define _COMPONENT              ACPI_OS_SERVICES
57 ACPI_MODULE_NAME("osl");
58 #define PREFIX          "ACPI: "
59 struct acpi_os_dpc {
60         acpi_osd_exec_callback function;
61         void *context;
62         struct work_struct work;
63         int wait;
64 };
65
66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
68 #endif
69
70 #ifdef ENABLE_DEBUGGER
71 #include <linux/kdb.h>
72
73 /* stuff for debugger support */
74 int acpi_in_debugger;
75 EXPORT_SYMBOL(acpi_in_debugger);
76
77 extern char line_buf[80];
78 #endif                          /*ENABLE_DEBUGGER */
79
80 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
81                                       u32 pm1b_ctrl);
82
83 static acpi_osd_handler acpi_irq_handler;
84 static void *acpi_irq_context;
85 static struct workqueue_struct *kacpid_wq;
86 static struct workqueue_struct *kacpi_notify_wq;
87 struct workqueue_struct *kacpi_hotplug_wq;
88 EXPORT_SYMBOL(kacpi_hotplug_wq);
89
90 /*
91  * This list of permanent mappings is for memory that may be accessed from
92  * interrupt context, where we can't do the ioremap().
93  */
94 struct acpi_ioremap {
95         struct list_head list;
96         void __iomem *virt;
97         acpi_physical_address phys;
98         acpi_size size;
99         unsigned long refcount;
100 };
101
102 static LIST_HEAD(acpi_ioremaps);
103 static DEFINE_MUTEX(acpi_ioremap_lock);
104
105 static void __init acpi_osi_setup_late(void);
106
107 /*
108  * The story of _OSI(Linux)
109  *
110  * From pre-history through Linux-2.6.22,
111  * Linux responded TRUE upon a BIOS OSI(Linux) query.
112  *
113  * Unfortunately, reference BIOS writers got wind of this
114  * and put OSI(Linux) in their example code, quickly exposing
115  * this string as ill-conceived and opening the door to
116  * an un-bounded number of BIOS incompatibilities.
117  *
118  * For example, OSI(Linux) was used on resume to re-POST a
119  * video card on one system, because Linux at that time
120  * could not do a speedy restore in its native driver.
121  * But then upon gaining quick native restore capability,
122  * Linux has no way to tell the BIOS to skip the time-consuming
123  * POST -- putting Linux at a permanent performance disadvantage.
124  * On another system, the BIOS writer used OSI(Linux)
125  * to infer native OS support for IPMI!  On other systems,
126  * OSI(Linux) simply got in the way of Linux claiming to
127  * be compatible with other operating systems, exposing
128  * BIOS issues such as skipped device initialization.
129  *
130  * So "Linux" turned out to be a really poor chose of
131  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
132  *
133  * BIOS writers should NOT query _OSI(Linux) on future systems.
134  * Linux will complain on the console when it sees it, and return FALSE.
135  * To get Linux to return TRUE for your system  will require
136  * a kernel source update to add a DMI entry,
137  * or boot with "acpi_osi=Linux"
138  */
139
140 static struct osi_linux {
141         unsigned int    enable:1;
142         unsigned int    dmi:1;
143         unsigned int    cmdline:1;
144 } osi_linux = {0, 0, 0};
145
146 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
147 {
148         if (!strcmp("Linux", interface)) {
149
150                 printk_once(KERN_NOTICE FW_BUG PREFIX
151                         "BIOS _OSI(Linux) query %s%s\n",
152                         osi_linux.enable ? "honored" : "ignored",
153                         osi_linux.cmdline ? " via cmdline" :
154                         osi_linux.dmi ? " via DMI" : "");
155         }
156
157         return supported;
158 }
159
160 static void __init acpi_request_region (struct acpi_generic_address *gas,
161         unsigned int length, char *desc)
162 {
163         u64 addr;
164
165         /* Handle possible alignment issues */
166         memcpy(&addr, &gas->address, sizeof(addr));
167         if (!addr || !length)
168                 return;
169
170         /* Resources are never freed */
171         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
172                 request_region(addr, length, desc);
173         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
174                 request_mem_region(addr, length, desc);
175 }
176
177 static int __init acpi_reserve_resources(void)
178 {
179         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
180                 "ACPI PM1a_EVT_BLK");
181
182         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
183                 "ACPI PM1b_EVT_BLK");
184
185         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
186                 "ACPI PM1a_CNT_BLK");
187
188         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
189                 "ACPI PM1b_CNT_BLK");
190
191         if (acpi_gbl_FADT.pm_timer_length == 4)
192                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
193
194         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
195                 "ACPI PM2_CNT_BLK");
196
197         /* Length of GPE blocks must be a non-negative multiple of 2 */
198
199         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
200                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
201                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
202
203         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
204                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
205                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
206
207         return 0;
208 }
209 device_initcall(acpi_reserve_resources);
210
211 void acpi_os_printf(const char *fmt, ...)
212 {
213         va_list args;
214         va_start(args, fmt);
215         acpi_os_vprintf(fmt, args);
216         va_end(args);
217 }
218
219 void acpi_os_vprintf(const char *fmt, va_list args)
220 {
221         static char buffer[512];
222
223         vsprintf(buffer, fmt, args);
224
225 #ifdef ENABLE_DEBUGGER
226         if (acpi_in_debugger) {
227                 kdb_printf("%s", buffer);
228         } else {
229                 printk(KERN_CONT "%s", buffer);
230         }
231 #else
232         printk(KERN_CONT "%s", buffer);
233 #endif
234 }
235
236 #ifdef CONFIG_KEXEC
237 static unsigned long acpi_rsdp;
238 static int __init setup_acpi_rsdp(char *arg)
239 {
240         acpi_rsdp = simple_strtoul(arg, NULL, 16);
241         return 0;
242 }
243 early_param("acpi_rsdp", setup_acpi_rsdp);
244 #endif
245
246 acpi_physical_address __init acpi_os_get_root_pointer(void)
247 {
248 #ifdef CONFIG_KEXEC
249         if (acpi_rsdp)
250                 return acpi_rsdp;
251 #endif
252
253         if (efi_enabled) {
254                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
255                         return efi.acpi20;
256                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
257                         return efi.acpi;
258                 else {
259                         printk(KERN_ERR PREFIX
260                                "System description tables not found\n");
261                         return 0;
262                 }
263         } else {
264                 acpi_physical_address pa = 0;
265
266                 acpi_find_root_pointer(&pa);
267                 return pa;
268         }
269 }
270
271 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
272 static struct acpi_ioremap *
273 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
274 {
275         struct acpi_ioremap *map;
276
277         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
278                 if (map->phys <= phys &&
279                     phys + size <= map->phys + map->size)
280                         return map;
281
282         return NULL;
283 }
284
285 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
286 static void __iomem *
287 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
288 {
289         struct acpi_ioremap *map;
290
291         map = acpi_map_lookup(phys, size);
292         if (map)
293                 return map->virt + (phys - map->phys);
294
295         return NULL;
296 }
297
298 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
299 {
300         struct acpi_ioremap *map;
301         void __iomem *virt = NULL;
302
303         mutex_lock(&acpi_ioremap_lock);
304         map = acpi_map_lookup(phys, size);
305         if (map) {
306                 virt = map->virt + (phys - map->phys);
307                 map->refcount++;
308         }
309         mutex_unlock(&acpi_ioremap_lock);
310         return virt;
311 }
312 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
313
314 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
315 static struct acpi_ioremap *
316 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
317 {
318         struct acpi_ioremap *map;
319
320         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
321                 if (map->virt <= virt &&
322                     virt + size <= map->virt + map->size)
323                         return map;
324
325         return NULL;
326 }
327
328 #ifndef CONFIG_IA64
329 #define should_use_kmap(pfn)   page_is_ram(pfn)
330 #else
331 /* ioremap will take care of cache attributes */
332 #define should_use_kmap(pfn)   0
333 #endif
334
335 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
336 {
337         unsigned long pfn;
338
339         pfn = pg_off >> PAGE_SHIFT;
340         if (should_use_kmap(pfn)) {
341                 if (pg_sz > PAGE_SIZE)
342                         return NULL;
343                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
344         } else
345                 return acpi_os_ioremap(pg_off, pg_sz);
346 }
347
348 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
349 {
350         unsigned long pfn;
351
352         pfn = pg_off >> PAGE_SHIFT;
353         if (page_is_ram(pfn))
354                 kunmap(pfn_to_page(pfn));
355         else
356                 iounmap(vaddr);
357 }
358
359 void __iomem *__init_refok
360 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
361 {
362         struct acpi_ioremap *map;
363         void __iomem *virt;
364         acpi_physical_address pg_off;
365         acpi_size pg_sz;
366
367         if (phys > ULONG_MAX) {
368                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
369                 return NULL;
370         }
371
372         if (!acpi_gbl_permanent_mmap)
373                 return __acpi_map_table((unsigned long)phys, size);
374
375         mutex_lock(&acpi_ioremap_lock);
376         /* Check if there's a suitable mapping already. */
377         map = acpi_map_lookup(phys, size);
378         if (map) {
379                 map->refcount++;
380                 goto out;
381         }
382
383         map = kzalloc(sizeof(*map), GFP_KERNEL);
384         if (!map) {
385                 mutex_unlock(&acpi_ioremap_lock);
386                 return NULL;
387         }
388
389         pg_off = round_down(phys, PAGE_SIZE);
390         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
391         virt = acpi_map(pg_off, pg_sz);
392         if (!virt) {
393                 mutex_unlock(&acpi_ioremap_lock);
394                 kfree(map);
395                 return NULL;
396         }
397
398         INIT_LIST_HEAD(&map->list);
399         map->virt = virt;
400         map->phys = pg_off;
401         map->size = pg_sz;
402         map->refcount = 1;
403
404         list_add_tail_rcu(&map->list, &acpi_ioremaps);
405
406  out:
407         mutex_unlock(&acpi_ioremap_lock);
408         return map->virt + (phys - map->phys);
409 }
410 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
411
412 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
413 {
414         if (!--map->refcount)
415                 list_del_rcu(&map->list);
416 }
417
418 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
419 {
420         if (!map->refcount) {
421                 synchronize_rcu();
422                 acpi_unmap(map->phys, map->virt);
423                 kfree(map);
424         }
425 }
426
427 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
428 {
429         struct acpi_ioremap *map;
430
431         if (!acpi_gbl_permanent_mmap) {
432                 __acpi_unmap_table(virt, size);
433                 return;
434         }
435
436         mutex_lock(&acpi_ioremap_lock);
437         map = acpi_map_lookup_virt(virt, size);
438         if (!map) {
439                 mutex_unlock(&acpi_ioremap_lock);
440                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
441                 return;
442         }
443         acpi_os_drop_map_ref(map);
444         mutex_unlock(&acpi_ioremap_lock);
445
446         acpi_os_map_cleanup(map);
447 }
448 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
449
450 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
451 {
452         if (!acpi_gbl_permanent_mmap)
453                 __acpi_unmap_table(virt, size);
454 }
455
456 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
457 {
458         u64 addr;
459         void __iomem *virt;
460
461         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
462                 return 0;
463
464         /* Handle possible alignment issues */
465         memcpy(&addr, &gas->address, sizeof(addr));
466         if (!addr || !gas->bit_width)
467                 return -EINVAL;
468
469         virt = acpi_os_map_memory(addr, gas->bit_width / 8);
470         if (!virt)
471                 return -EIO;
472
473         return 0;
474 }
475 EXPORT_SYMBOL(acpi_os_map_generic_address);
476
477 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
478 {
479         u64 addr;
480         struct acpi_ioremap *map;
481
482         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
483                 return;
484
485         /* Handle possible alignment issues */
486         memcpy(&addr, &gas->address, sizeof(addr));
487         if (!addr || !gas->bit_width)
488                 return;
489
490         mutex_lock(&acpi_ioremap_lock);
491         map = acpi_map_lookup(addr, gas->bit_width / 8);
492         if (!map) {
493                 mutex_unlock(&acpi_ioremap_lock);
494                 return;
495         }
496         acpi_os_drop_map_ref(map);
497         mutex_unlock(&acpi_ioremap_lock);
498
499         acpi_os_map_cleanup(map);
500 }
501 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
502
503 #ifdef ACPI_FUTURE_USAGE
504 acpi_status
505 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
506 {
507         if (!phys || !virt)
508                 return AE_BAD_PARAMETER;
509
510         *phys = virt_to_phys(virt);
511
512         return AE_OK;
513 }
514 #endif
515
516 #define ACPI_MAX_OVERRIDE_LEN 100
517
518 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
519
520 acpi_status
521 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
522                             acpi_string * new_val)
523 {
524         if (!init_val || !new_val)
525                 return AE_BAD_PARAMETER;
526
527         *new_val = NULL;
528         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
529                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
530                        acpi_os_name);
531                 *new_val = acpi_os_name;
532         }
533
534         return AE_OK;
535 }
536
537 acpi_status
538 acpi_os_table_override(struct acpi_table_header * existing_table,
539                        struct acpi_table_header ** new_table)
540 {
541         if (!existing_table || !new_table)
542                 return AE_BAD_PARAMETER;
543
544         *new_table = NULL;
545
546 #ifdef CONFIG_ACPI_CUSTOM_DSDT
547         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
548                 *new_table = (struct acpi_table_header *)AmlCode;
549 #endif
550         if (*new_table != NULL) {
551                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
552                            "this is unsafe: tainting kernel\n",
553                        existing_table->signature,
554                        existing_table->oem_table_id);
555                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
556         }
557         return AE_OK;
558 }
559
560 static irqreturn_t acpi_irq(int irq, void *dev_id)
561 {
562         u32 handled;
563
564         handled = (*acpi_irq_handler) (acpi_irq_context);
565
566         if (handled) {
567                 acpi_irq_handled++;
568                 return IRQ_HANDLED;
569         } else {
570                 acpi_irq_not_handled++;
571                 return IRQ_NONE;
572         }
573 }
574
575 acpi_status
576 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
577                                   void *context)
578 {
579         unsigned int irq;
580
581         acpi_irq_stats_init();
582
583         /*
584          * ACPI interrupts different from the SCI in our copy of the FADT are
585          * not supported.
586          */
587         if (gsi != acpi_gbl_FADT.sci_interrupt)
588                 return AE_BAD_PARAMETER;
589
590         if (acpi_irq_handler)
591                 return AE_ALREADY_ACQUIRED;
592
593         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
594                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
595                        gsi);
596                 return AE_OK;
597         }
598
599         acpi_irq_handler = handler;
600         acpi_irq_context = context;
601         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
602                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
603                 acpi_irq_handler = NULL;
604                 return AE_NOT_ACQUIRED;
605         }
606
607         return AE_OK;
608 }
609
610 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
611 {
612         if (irq != acpi_gbl_FADT.sci_interrupt)
613                 return AE_BAD_PARAMETER;
614
615         free_irq(irq, acpi_irq);
616         acpi_irq_handler = NULL;
617
618         return AE_OK;
619 }
620
621 /*
622  * Running in interpreter thread context, safe to sleep
623  */
624
625 void acpi_os_sleep(u64 ms)
626 {
627         schedule_timeout_interruptible(msecs_to_jiffies(ms));
628 }
629
630 void acpi_os_stall(u32 us)
631 {
632         while (us) {
633                 u32 delay = 1000;
634
635                 if (delay > us)
636                         delay = us;
637                 udelay(delay);
638                 touch_nmi_watchdog();
639                 us -= delay;
640         }
641 }
642
643 /*
644  * Support ACPI 3.0 AML Timer operand
645  * Returns 64-bit free-running, monotonically increasing timer
646  * with 100ns granularity
647  */
648 u64 acpi_os_get_timer(void)
649 {
650         static u64 t;
651
652 #ifdef  CONFIG_HPET
653         /* TBD: use HPET if available */
654 #endif
655
656 #ifdef  CONFIG_X86_PM_TIMER
657         /* TBD: default to PM timer if HPET was not available */
658 #endif
659         if (!t)
660                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
661
662         return ++t;
663 }
664
665 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
666 {
667         u32 dummy;
668
669         if (!value)
670                 value = &dummy;
671
672         *value = 0;
673         if (width <= 8) {
674                 *(u8 *) value = inb(port);
675         } else if (width <= 16) {
676                 *(u16 *) value = inw(port);
677         } else if (width <= 32) {
678                 *(u32 *) value = inl(port);
679         } else {
680                 BUG();
681         }
682
683         return AE_OK;
684 }
685
686 EXPORT_SYMBOL(acpi_os_read_port);
687
688 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
689 {
690         if (width <= 8) {
691                 outb(value, port);
692         } else if (width <= 16) {
693                 outw(value, port);
694         } else if (width <= 32) {
695                 outl(value, port);
696         } else {
697                 BUG();
698         }
699
700         return AE_OK;
701 }
702
703 EXPORT_SYMBOL(acpi_os_write_port);
704
705 acpi_status
706 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
707 {
708         void __iomem *virt_addr;
709         unsigned int size = width / 8;
710         bool unmap = false;
711         u32 dummy;
712
713         rcu_read_lock();
714         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
715         if (!virt_addr) {
716                 rcu_read_unlock();
717                 virt_addr = acpi_os_ioremap(phys_addr, size);
718                 if (!virt_addr)
719                         return AE_BAD_ADDRESS;
720                 unmap = true;
721         }
722
723         if (!value)
724                 value = &dummy;
725
726         switch (width) {
727         case 8:
728                 *(u8 *) value = readb(virt_addr);
729                 break;
730         case 16:
731                 *(u16 *) value = readw(virt_addr);
732                 break;
733         case 32:
734                 *(u32 *) value = readl(virt_addr);
735                 break;
736         default:
737                 BUG();
738         }
739
740         if (unmap)
741                 iounmap(virt_addr);
742         else
743                 rcu_read_unlock();
744
745         return AE_OK;
746 }
747
748 #ifdef readq
749 static inline u64 read64(const volatile void __iomem *addr)
750 {
751         return readq(addr);
752 }
753 #else
754 static inline u64 read64(const volatile void __iomem *addr)
755 {
756         u64 l, h;
757         l = readl(addr);
758         h = readl(addr+4);
759         return l | (h << 32);
760 }
761 #endif
762
763 acpi_status
764 acpi_os_read_memory64(acpi_physical_address phys_addr, u64 *value, u32 width)
765 {
766         void __iomem *virt_addr;
767         unsigned int size = width / 8;
768         bool unmap = false;
769         u64 dummy;
770
771         rcu_read_lock();
772         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
773         if (!virt_addr) {
774                 rcu_read_unlock();
775                 virt_addr = acpi_os_ioremap(phys_addr, size);
776                 if (!virt_addr)
777                         return AE_BAD_ADDRESS;
778                 unmap = true;
779         }
780
781         if (!value)
782                 value = &dummy;
783
784         switch (width) {
785         case 8:
786                 *(u8 *) value = readb(virt_addr);
787                 break;
788         case 16:
789                 *(u16 *) value = readw(virt_addr);
790                 break;
791         case 32:
792                 *(u32 *) value = readl(virt_addr);
793                 break;
794         case 64:
795                 *(u64 *) value = read64(virt_addr);
796                 break;
797         default:
798                 BUG();
799         }
800
801         if (unmap)
802                 iounmap(virt_addr);
803         else
804                 rcu_read_unlock();
805
806         return AE_OK;
807 }
808
809 acpi_status
810 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
811 {
812         void __iomem *virt_addr;
813         unsigned int size = width / 8;
814         bool unmap = false;
815
816         rcu_read_lock();
817         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
818         if (!virt_addr) {
819                 rcu_read_unlock();
820                 virt_addr = acpi_os_ioremap(phys_addr, size);
821                 if (!virt_addr)
822                         return AE_BAD_ADDRESS;
823                 unmap = true;
824         }
825
826         switch (width) {
827         case 8:
828                 writeb(value, virt_addr);
829                 break;
830         case 16:
831                 writew(value, virt_addr);
832                 break;
833         case 32:
834                 writel(value, virt_addr);
835                 break;
836         default:
837                 BUG();
838         }
839
840         if (unmap)
841                 iounmap(virt_addr);
842         else
843                 rcu_read_unlock();
844
845         return AE_OK;
846 }
847
848 #ifdef writeq
849 static inline void write64(u64 val, volatile void __iomem *addr)
850 {
851         writeq(val, addr);
852 }
853 #else
854 static inline void write64(u64 val, volatile void __iomem *addr)
855 {
856         writel(val, addr);
857         writel(val>>32, addr+4);
858 }
859 #endif
860
861 acpi_status
862 acpi_os_write_memory64(acpi_physical_address phys_addr, u64 value, u32 width)
863 {
864         void __iomem *virt_addr;
865         unsigned int size = width / 8;
866         bool unmap = false;
867
868         rcu_read_lock();
869         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
870         if (!virt_addr) {
871                 rcu_read_unlock();
872                 virt_addr = acpi_os_ioremap(phys_addr, size);
873                 if (!virt_addr)
874                         return AE_BAD_ADDRESS;
875                 unmap = true;
876         }
877
878         switch (width) {
879         case 8:
880                 writeb(value, virt_addr);
881                 break;
882         case 16:
883                 writew(value, virt_addr);
884                 break;
885         case 32:
886                 writel(value, virt_addr);
887                 break;
888         case 64:
889                 write64(value, virt_addr);
890                 break;
891         default:
892                 BUG();
893         }
894
895         if (unmap)
896                 iounmap(virt_addr);
897         else
898                 rcu_read_unlock();
899
900         return AE_OK;
901 }
902
903 acpi_status
904 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
905                                u64 *value, u32 width)
906 {
907         int result, size;
908         u32 value32;
909
910         if (!value)
911                 return AE_BAD_PARAMETER;
912
913         switch (width) {
914         case 8:
915                 size = 1;
916                 break;
917         case 16:
918                 size = 2;
919                 break;
920         case 32:
921                 size = 4;
922                 break;
923         default:
924                 return AE_ERROR;
925         }
926
927         result = raw_pci_read(pci_id->segment, pci_id->bus,
928                                 PCI_DEVFN(pci_id->device, pci_id->function),
929                                 reg, size, &value32);
930         *value = value32;
931
932         return (result ? AE_ERROR : AE_OK);
933 }
934
935 acpi_status
936 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
937                                 u64 value, u32 width)
938 {
939         int result, size;
940
941         switch (width) {
942         case 8:
943                 size = 1;
944                 break;
945         case 16:
946                 size = 2;
947                 break;
948         case 32:
949                 size = 4;
950                 break;
951         default:
952                 return AE_ERROR;
953         }
954
955         result = raw_pci_write(pci_id->segment, pci_id->bus,
956                                 PCI_DEVFN(pci_id->device, pci_id->function),
957                                 reg, size, value);
958
959         return (result ? AE_ERROR : AE_OK);
960 }
961
962 static void acpi_os_execute_deferred(struct work_struct *work)
963 {
964         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
965
966         if (dpc->wait)
967                 acpi_os_wait_events_complete(NULL);
968
969         dpc->function(dpc->context);
970         kfree(dpc);
971 }
972
973 /*******************************************************************************
974  *
975  * FUNCTION:    acpi_os_execute
976  *
977  * PARAMETERS:  Type               - Type of the callback
978  *              Function           - Function to be executed
979  *              Context            - Function parameters
980  *
981  * RETURN:      Status
982  *
983  * DESCRIPTION: Depending on type, either queues function for deferred execution or
984  *              immediately executes function on a separate thread.
985  *
986  ******************************************************************************/
987
988 static acpi_status __acpi_os_execute(acpi_execute_type type,
989         acpi_osd_exec_callback function, void *context, int hp)
990 {
991         acpi_status status = AE_OK;
992         struct acpi_os_dpc *dpc;
993         struct workqueue_struct *queue;
994         int ret;
995         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
996                           "Scheduling function [%p(%p)] for deferred execution.\n",
997                           function, context));
998
999         /*
1000          * Allocate/initialize DPC structure.  Note that this memory will be
1001          * freed by the callee.  The kernel handles the work_struct list  in a
1002          * way that allows us to also free its memory inside the callee.
1003          * Because we may want to schedule several tasks with different
1004          * parameters we can't use the approach some kernel code uses of
1005          * having a static work_struct.
1006          */
1007
1008         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1009         if (!dpc)
1010                 return AE_NO_MEMORY;
1011
1012         dpc->function = function;
1013         dpc->context = context;
1014
1015         /*
1016          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1017          * because the hotplug code may call driver .remove() functions,
1018          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1019          * to flush these workqueues.
1020          */
1021         queue = hp ? kacpi_hotplug_wq :
1022                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
1023         dpc->wait = hp ? 1 : 0;
1024
1025         if (queue == kacpi_hotplug_wq)
1026                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1027         else if (queue == kacpi_notify_wq)
1028                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1029         else
1030                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1031
1032         /*
1033          * On some machines, a software-initiated SMI causes corruption unless
1034          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1035          * typically it's done in GPE-related methods that are run via
1036          * workqueues, so we can avoid the known corruption cases by always
1037          * queueing on CPU 0.
1038          */
1039         ret = queue_work_on(0, queue, &dpc->work);
1040
1041         if (!ret) {
1042                 printk(KERN_ERR PREFIX
1043                           "Call to queue_work() failed.\n");
1044                 status = AE_ERROR;
1045                 kfree(dpc);
1046         }
1047         return status;
1048 }
1049
1050 acpi_status acpi_os_execute(acpi_execute_type type,
1051                             acpi_osd_exec_callback function, void *context)
1052 {
1053         return __acpi_os_execute(type, function, context, 0);
1054 }
1055 EXPORT_SYMBOL(acpi_os_execute);
1056
1057 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1058         void *context)
1059 {
1060         return __acpi_os_execute(0, function, context, 1);
1061 }
1062
1063 void acpi_os_wait_events_complete(void *context)
1064 {
1065         flush_workqueue(kacpid_wq);
1066         flush_workqueue(kacpi_notify_wq);
1067 }
1068
1069 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1070
1071 acpi_status
1072 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1073 {
1074         struct semaphore *sem = NULL;
1075
1076         sem = acpi_os_allocate(sizeof(struct semaphore));
1077         if (!sem)
1078                 return AE_NO_MEMORY;
1079         memset(sem, 0, sizeof(struct semaphore));
1080
1081         sema_init(sem, initial_units);
1082
1083         *handle = (acpi_handle *) sem;
1084
1085         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1086                           *handle, initial_units));
1087
1088         return AE_OK;
1089 }
1090
1091 /*
1092  * TODO: A better way to delete semaphores?  Linux doesn't have a
1093  * 'delete_semaphore()' function -- may result in an invalid
1094  * pointer dereference for non-synchronized consumers.  Should
1095  * we at least check for blocked threads and signal/cancel them?
1096  */
1097
1098 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1099 {
1100         struct semaphore *sem = (struct semaphore *)handle;
1101
1102         if (!sem)
1103                 return AE_BAD_PARAMETER;
1104
1105         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1106
1107         BUG_ON(!list_empty(&sem->wait_list));
1108         kfree(sem);
1109         sem = NULL;
1110
1111         return AE_OK;
1112 }
1113
1114 /*
1115  * TODO: Support for units > 1?
1116  */
1117 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1118 {
1119         acpi_status status = AE_OK;
1120         struct semaphore *sem = (struct semaphore *)handle;
1121         long jiffies;
1122         int ret = 0;
1123
1124         if (!sem || (units < 1))
1125                 return AE_BAD_PARAMETER;
1126
1127         if (units > 1)
1128                 return AE_SUPPORT;
1129
1130         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1131                           handle, units, timeout));
1132
1133         if (timeout == ACPI_WAIT_FOREVER)
1134                 jiffies = MAX_SCHEDULE_TIMEOUT;
1135         else
1136                 jiffies = msecs_to_jiffies(timeout);
1137         
1138         ret = down_timeout(sem, jiffies);
1139         if (ret)
1140                 status = AE_TIME;
1141
1142         if (ACPI_FAILURE(status)) {
1143                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1144                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1145                                   handle, units, timeout,
1146                                   acpi_format_exception(status)));
1147         } else {
1148                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1149                                   "Acquired semaphore[%p|%d|%d]", handle,
1150                                   units, timeout));
1151         }
1152
1153         return status;
1154 }
1155
1156 /*
1157  * TODO: Support for units > 1?
1158  */
1159 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1160 {
1161         struct semaphore *sem = (struct semaphore *)handle;
1162
1163         if (!sem || (units < 1))
1164                 return AE_BAD_PARAMETER;
1165
1166         if (units > 1)
1167                 return AE_SUPPORT;
1168
1169         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1170                           units));
1171
1172         up(sem);
1173
1174         return AE_OK;
1175 }
1176
1177 #ifdef ACPI_FUTURE_USAGE
1178 u32 acpi_os_get_line(char *buffer)
1179 {
1180
1181 #ifdef ENABLE_DEBUGGER
1182         if (acpi_in_debugger) {
1183                 u32 chars;
1184
1185                 kdb_read(buffer, sizeof(line_buf));
1186
1187                 /* remove the CR kdb includes */
1188                 chars = strlen(buffer) - 1;
1189                 buffer[chars] = '\0';
1190         }
1191 #endif
1192
1193         return 0;
1194 }
1195 #endif                          /*  ACPI_FUTURE_USAGE  */
1196
1197 acpi_status acpi_os_signal(u32 function, void *info)
1198 {
1199         switch (function) {
1200         case ACPI_SIGNAL_FATAL:
1201                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1202                 break;
1203         case ACPI_SIGNAL_BREAKPOINT:
1204                 /*
1205                  * AML Breakpoint
1206                  * ACPI spec. says to treat it as a NOP unless
1207                  * you are debugging.  So if/when we integrate
1208                  * AML debugger into the kernel debugger its
1209                  * hook will go here.  But until then it is
1210                  * not useful to print anything on breakpoints.
1211                  */
1212                 break;
1213         default:
1214                 break;
1215         }
1216
1217         return AE_OK;
1218 }
1219
1220 static int __init acpi_os_name_setup(char *str)
1221 {
1222         char *p = acpi_os_name;
1223         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1224
1225         if (!str || !*str)
1226                 return 0;
1227
1228         for (; count-- && str && *str; str++) {
1229                 if (isalnum(*str) || *str == ' ' || *str == ':')
1230                         *p++ = *str;
1231                 else if (*str == '\'' || *str == '"')
1232                         continue;
1233                 else
1234                         break;
1235         }
1236         *p = 0;
1237
1238         return 1;
1239
1240 }
1241
1242 __setup("acpi_os_name=", acpi_os_name_setup);
1243
1244 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1245 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1246
1247 struct osi_setup_entry {
1248         char string[OSI_STRING_LENGTH_MAX];
1249         bool enable;
1250 };
1251
1252 static struct osi_setup_entry __initdata
1253                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1254         {"Module Device", true},
1255         {"Processor Device", true},
1256         {"3.0 _SCP Extensions", true},
1257         {"Processor Aggregator Device", true},
1258 };
1259
1260 void __init acpi_osi_setup(char *str)
1261 {
1262         struct osi_setup_entry *osi;
1263         bool enable = true;
1264         int i;
1265
1266         if (!acpi_gbl_create_osi_method)
1267                 return;
1268
1269         if (str == NULL || *str == '\0') {
1270                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1271                 acpi_gbl_create_osi_method = FALSE;
1272                 return;
1273         }
1274
1275         if (*str == '!') {
1276                 str++;
1277                 enable = false;
1278         }
1279
1280         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1281                 osi = &osi_setup_entries[i];
1282                 if (!strcmp(osi->string, str)) {
1283                         osi->enable = enable;
1284                         break;
1285                 } else if (osi->string[0] == '\0') {
1286                         osi->enable = enable;
1287                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1288                         break;
1289                 }
1290         }
1291 }
1292
1293 static void __init set_osi_linux(unsigned int enable)
1294 {
1295         if (osi_linux.enable != enable)
1296                 osi_linux.enable = enable;
1297
1298         if (osi_linux.enable)
1299                 acpi_osi_setup("Linux");
1300         else
1301                 acpi_osi_setup("!Linux");
1302
1303         return;
1304 }
1305
1306 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1307 {
1308         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1309         osi_linux.dmi = 0;
1310         set_osi_linux(enable);
1311
1312         return;
1313 }
1314
1315 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1316 {
1317         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1318
1319         if (enable == -1)
1320                 return;
1321
1322         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1323         set_osi_linux(enable);
1324
1325         return;
1326 }
1327
1328 /*
1329  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1330  *
1331  * empty string disables _OSI
1332  * string starting with '!' disables that string
1333  * otherwise string is added to list, augmenting built-in strings
1334  */
1335 static void __init acpi_osi_setup_late(void)
1336 {
1337         struct osi_setup_entry *osi;
1338         char *str;
1339         int i;
1340         acpi_status status;
1341
1342         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1343                 osi = &osi_setup_entries[i];
1344                 str = osi->string;
1345
1346                 if (*str == '\0')
1347                         break;
1348                 if (osi->enable) {
1349                         status = acpi_install_interface(str);
1350
1351                         if (ACPI_SUCCESS(status))
1352                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1353                 } else {
1354                         status = acpi_remove_interface(str);
1355
1356                         if (ACPI_SUCCESS(status))
1357                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1358                 }
1359         }
1360 }
1361
1362 static int __init osi_setup(char *str)
1363 {
1364         if (str && !strcmp("Linux", str))
1365                 acpi_cmdline_osi_linux(1);
1366         else if (str && !strcmp("!Linux", str))
1367                 acpi_cmdline_osi_linux(0);
1368         else
1369                 acpi_osi_setup(str);
1370
1371         return 1;
1372 }
1373
1374 __setup("acpi_osi=", osi_setup);
1375
1376 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1377 static int __init acpi_serialize_setup(char *str)
1378 {
1379         printk(KERN_INFO PREFIX "serialize enabled\n");
1380
1381         acpi_gbl_all_methods_serialized = TRUE;
1382
1383         return 1;
1384 }
1385
1386 __setup("acpi_serialize", acpi_serialize_setup);
1387
1388 /* Check of resource interference between native drivers and ACPI
1389  * OperationRegions (SystemIO and System Memory only).
1390  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1391  * in arbitrary AML code and can interfere with legacy drivers.
1392  * acpi_enforce_resources= can be set to:
1393  *
1394  *   - strict (default) (2)
1395  *     -> further driver trying to access the resources will not load
1396  *   - lax              (1)
1397  *     -> further driver trying to access the resources will load, but you
1398  *     get a system message that something might go wrong...
1399  *
1400  *   - no               (0)
1401  *     -> ACPI Operation Region resources will not be registered
1402  *
1403  */
1404 #define ENFORCE_RESOURCES_STRICT 2
1405 #define ENFORCE_RESOURCES_LAX    1
1406 #define ENFORCE_RESOURCES_NO     0
1407
1408 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1409
1410 static int __init acpi_enforce_resources_setup(char *str)
1411 {
1412         if (str == NULL || *str == '\0')
1413                 return 0;
1414
1415         if (!strcmp("strict", str))
1416                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1417         else if (!strcmp("lax", str))
1418                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1419         else if (!strcmp("no", str))
1420                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1421
1422         return 1;
1423 }
1424
1425 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1426
1427 /* Check for resource conflicts between ACPI OperationRegions and native
1428  * drivers */
1429 int acpi_check_resource_conflict(const struct resource *res)
1430 {
1431         acpi_adr_space_type space_id;
1432         acpi_size length;
1433         u8 warn = 0;
1434         int clash = 0;
1435
1436         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1437                 return 0;
1438         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1439                 return 0;
1440
1441         if (res->flags & IORESOURCE_IO)
1442                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1443         else
1444                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1445
1446         length = res->end - res->start + 1;
1447         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1448                 warn = 1;
1449         clash = acpi_check_address_range(space_id, res->start, length, warn);
1450
1451         if (clash) {
1452                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1453                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1454                                 printk(KERN_NOTICE "ACPI: This conflict may"
1455                                        " cause random problems and system"
1456                                        " instability\n");
1457                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1458                                " for this device, you should use it instead of"
1459                                " the native driver\n");
1460                 }
1461                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1462                         return -EBUSY;
1463         }
1464         return 0;
1465 }
1466 EXPORT_SYMBOL(acpi_check_resource_conflict);
1467
1468 int acpi_check_region(resource_size_t start, resource_size_t n,
1469                       const char *name)
1470 {
1471         struct resource res = {
1472                 .start = start,
1473                 .end   = start + n - 1,
1474                 .name  = name,
1475                 .flags = IORESOURCE_IO,
1476         };
1477
1478         return acpi_check_resource_conflict(&res);
1479 }
1480 EXPORT_SYMBOL(acpi_check_region);
1481
1482 /*
1483  * Let drivers know whether the resource checks are effective
1484  */
1485 int acpi_resources_are_enforced(void)
1486 {
1487         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1488 }
1489 EXPORT_SYMBOL(acpi_resources_are_enforced);
1490
1491 /*
1492  * Deallocate the memory for a spinlock.
1493  */
1494 void acpi_os_delete_lock(acpi_spinlock handle)
1495 {
1496         ACPI_FREE(handle);
1497 }
1498
1499 /*
1500  * Acquire a spinlock.
1501  *
1502  * handle is a pointer to the spinlock_t.
1503  */
1504
1505 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1506 {
1507         acpi_cpu_flags flags;
1508         spin_lock_irqsave(lockp, flags);
1509         return flags;
1510 }
1511
1512 /*
1513  * Release a spinlock. See above.
1514  */
1515
1516 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1517 {
1518         spin_unlock_irqrestore(lockp, flags);
1519 }
1520
1521 #ifndef ACPI_USE_LOCAL_CACHE
1522
1523 /*******************************************************************************
1524  *
1525  * FUNCTION:    acpi_os_create_cache
1526  *
1527  * PARAMETERS:  name      - Ascii name for the cache
1528  *              size      - Size of each cached object
1529  *              depth     - Maximum depth of the cache (in objects) <ignored>
1530  *              cache     - Where the new cache object is returned
1531  *
1532  * RETURN:      status
1533  *
1534  * DESCRIPTION: Create a cache object
1535  *
1536  ******************************************************************************/
1537
1538 acpi_status
1539 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1540 {
1541         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1542         if (*cache == NULL)
1543                 return AE_ERROR;
1544         else
1545                 return AE_OK;
1546 }
1547
1548 /*******************************************************************************
1549  *
1550  * FUNCTION:    acpi_os_purge_cache
1551  *
1552  * PARAMETERS:  Cache           - Handle to cache object
1553  *
1554  * RETURN:      Status
1555  *
1556  * DESCRIPTION: Free all objects within the requested cache.
1557  *
1558  ******************************************************************************/
1559
1560 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1561 {
1562         kmem_cache_shrink(cache);
1563         return (AE_OK);
1564 }
1565
1566 /*******************************************************************************
1567  *
1568  * FUNCTION:    acpi_os_delete_cache
1569  *
1570  * PARAMETERS:  Cache           - Handle to cache object
1571  *
1572  * RETURN:      Status
1573  *
1574  * DESCRIPTION: Free all objects within the requested cache and delete the
1575  *              cache object.
1576  *
1577  ******************************************************************************/
1578
1579 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1580 {
1581         kmem_cache_destroy(cache);
1582         return (AE_OK);
1583 }
1584
1585 /*******************************************************************************
1586  *
1587  * FUNCTION:    acpi_os_release_object
1588  *
1589  * PARAMETERS:  Cache       - Handle to cache object
1590  *              Object      - The object to be released
1591  *
1592  * RETURN:      None
1593  *
1594  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1595  *              the object is deleted.
1596  *
1597  ******************************************************************************/
1598
1599 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1600 {
1601         kmem_cache_free(cache, object);
1602         return (AE_OK);
1603 }
1604 #endif
1605
1606 acpi_status __init acpi_os_initialize(void)
1607 {
1608         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1609         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1610         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1611         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1612
1613         return AE_OK;
1614 }
1615
1616 acpi_status __init acpi_os_initialize1(void)
1617 {
1618         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1619         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1620         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1621         BUG_ON(!kacpid_wq);
1622         BUG_ON(!kacpi_notify_wq);
1623         BUG_ON(!kacpi_hotplug_wq);
1624         acpi_install_interface_handler(acpi_osi_handler);
1625         acpi_osi_setup_late();
1626         return AE_OK;
1627 }
1628
1629 acpi_status acpi_os_terminate(void)
1630 {
1631         if (acpi_irq_handler) {
1632                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1633                                                  acpi_irq_handler);
1634         }
1635
1636         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1637         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1638         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1639         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1640
1641         destroy_workqueue(kacpid_wq);
1642         destroy_workqueue(kacpi_notify_wq);
1643         destroy_workqueue(kacpi_hotplug_wq);
1644
1645         return AE_OK;
1646 }
1647
1648 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1649                                   u32 pm1b_control)
1650 {
1651         int rc = 0;
1652         if (__acpi_os_prepare_sleep)
1653                 rc = __acpi_os_prepare_sleep(sleep_state,
1654                                              pm1a_control, pm1b_control);
1655         if (rc < 0)
1656                 return AE_ERROR;
1657         else if (rc > 0)
1658                 return AE_CTRL_SKIP;
1659
1660         return AE_OK;
1661 }
1662
1663 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1664                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1665 {
1666         __acpi_os_prepare_sleep = func;
1667 }