ACPI: Do not export functions that are only used in osl.c
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / osl.c
blobff2189d3fa064411a292c4b594766466f82619b2
1 /*
2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
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>
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/pci.h>
35 #include <linux/interrupt.h>
36 #include <linux/kmod.h>
37 #include <linux/delay.h>
38 #include <linux/workqueue.h>
39 #include <linux/nmi.h>
40 #include <linux/acpi.h>
41 #include <linux/acpi_io.h>
42 #include <linux/efi.h>
43 #include <linux/ioport.h>
44 #include <linux/list.h>
45 #include <linux/jiffies.h>
46 #include <linux/semaphore.h>
48 #include <asm/io.h>
49 #include <asm/uaccess.h>
51 #include <acpi/acpi.h>
52 #include <acpi/acpi_bus.h>
53 #include <acpi/processor.h>
55 #define _COMPONENT ACPI_OS_SERVICES
56 ACPI_MODULE_NAME("osl");
57 #define PREFIX "ACPI: "
58 struct acpi_os_dpc {
59 acpi_osd_exec_callback function;
60 void *context;
61 struct work_struct work;
62 int wait;
65 #ifdef CONFIG_ACPI_CUSTOM_DSDT
66 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
67 #endif
69 #ifdef ENABLE_DEBUGGER
70 #include <linux/kdb.h>
72 /* stuff for debugger support */
73 int acpi_in_debugger;
74 EXPORT_SYMBOL(acpi_in_debugger);
76 extern char line_buf[80];
77 #endif /*ENABLE_DEBUGGER */
79 static unsigned int acpi_irq_irq;
80 static acpi_osd_handler acpi_irq_handler;
81 static void *acpi_irq_context;
82 static struct workqueue_struct *kacpid_wq;
83 static struct workqueue_struct *kacpi_notify_wq;
84 static struct workqueue_struct *kacpi_hotplug_wq;
86 struct acpi_res_list {
87 resource_size_t start;
88 resource_size_t end;
89 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
90 char name[5]; /* only can have a length of 4 chars, make use of this
91 one instead of res->name, no need to kalloc then */
92 struct list_head resource_list;
93 int count;
96 static LIST_HEAD(resource_list_head);
97 static DEFINE_SPINLOCK(acpi_res_lock);
100 * This list of permanent mappings is for memory that may be accessed from
101 * interrupt context, where we can't do the ioremap().
103 struct acpi_ioremap {
104 struct list_head list;
105 void __iomem *virt;
106 acpi_physical_address phys;
107 acpi_size size;
108 struct kref ref;
111 static LIST_HEAD(acpi_ioremaps);
112 static DEFINE_SPINLOCK(acpi_ioremap_lock);
114 static void __init acpi_osi_setup_late(void);
117 * The story of _OSI(Linux)
119 * From pre-history through Linux-2.6.22,
120 * Linux responded TRUE upon a BIOS OSI(Linux) query.
122 * Unfortunately, reference BIOS writers got wind of this
123 * and put OSI(Linux) in their example code, quickly exposing
124 * this string as ill-conceived and opening the door to
125 * an un-bounded number of BIOS incompatibilities.
127 * For example, OSI(Linux) was used on resume to re-POST a
128 * video card on one system, because Linux at that time
129 * could not do a speedy restore in its native driver.
130 * But then upon gaining quick native restore capability,
131 * Linux has no way to tell the BIOS to skip the time-consuming
132 * POST -- putting Linux at a permanent performance disadvantage.
133 * On another system, the BIOS writer used OSI(Linux)
134 * to infer native OS support for IPMI! On other systems,
135 * OSI(Linux) simply got in the way of Linux claiming to
136 * be compatible with other operating systems, exposing
137 * BIOS issues such as skipped device initialization.
139 * So "Linux" turned out to be a really poor chose of
140 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
142 * BIOS writers should NOT query _OSI(Linux) on future systems.
143 * Linux will complain on the console when it sees it, and return FALSE.
144 * To get Linux to return TRUE for your system will require
145 * a kernel source update to add a DMI entry,
146 * or boot with "acpi_osi=Linux"
149 static struct osi_linux {
150 unsigned int enable:1;
151 unsigned int dmi:1;
152 unsigned int cmdline:1;
153 } osi_linux = {0, 0, 0};
155 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
157 if (!strcmp("Linux", interface)) {
159 printk(KERN_NOTICE FW_BUG PREFIX
160 "BIOS _OSI(Linux) query %s%s\n",
161 osi_linux.enable ? "honored" : "ignored",
162 osi_linux.cmdline ? " via cmdline" :
163 osi_linux.dmi ? " via DMI" : "");
166 return supported;
169 static void __init acpi_request_region (struct acpi_generic_address *addr,
170 unsigned int length, char *desc)
172 if (!addr->address || !length)
173 return;
175 /* Resources are never freed */
176 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
177 request_region(addr->address, length, desc);
178 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
179 request_mem_region(addr->address, length, desc);
182 static int __init acpi_reserve_resources(void)
184 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
185 "ACPI PM1a_EVT_BLK");
187 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
188 "ACPI PM1b_EVT_BLK");
190 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
191 "ACPI PM1a_CNT_BLK");
193 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
194 "ACPI PM1b_CNT_BLK");
196 if (acpi_gbl_FADT.pm_timer_length == 4)
197 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
199 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
200 "ACPI PM2_CNT_BLK");
202 /* Length of GPE blocks must be a non-negative multiple of 2 */
204 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
205 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
206 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
208 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
209 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
210 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
212 return 0;
214 device_initcall(acpi_reserve_resources);
216 void acpi_os_printf(const char *fmt, ...)
218 va_list args;
219 va_start(args, fmt);
220 acpi_os_vprintf(fmt, args);
221 va_end(args);
224 void acpi_os_vprintf(const char *fmt, va_list args)
226 static char buffer[512];
228 vsprintf(buffer, fmt, args);
230 #ifdef ENABLE_DEBUGGER
231 if (acpi_in_debugger) {
232 kdb_printf("%s", buffer);
233 } else {
234 printk(KERN_CONT "%s", buffer);
236 #else
237 printk(KERN_CONT "%s", buffer);
238 #endif
241 acpi_physical_address __init acpi_os_get_root_pointer(void)
243 if (efi_enabled) {
244 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
245 return efi.acpi20;
246 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
247 return efi.acpi;
248 else {
249 printk(KERN_ERR PREFIX
250 "System description tables not found\n");
251 return 0;
253 } else {
254 acpi_physical_address pa = 0;
256 acpi_find_root_pointer(&pa);
257 return pa;
261 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
262 static struct acpi_ioremap *
263 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
265 struct acpi_ioremap *map;
267 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
268 if (map->phys <= phys &&
269 phys + size <= map->phys + map->size)
270 return map;
272 return NULL;
275 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
276 static void __iomem *
277 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
279 struct acpi_ioremap *map;
281 map = acpi_map_lookup(phys, size);
282 if (map)
283 return map->virt + (phys - map->phys);
285 return NULL;
288 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
289 static struct acpi_ioremap *
290 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
292 struct acpi_ioremap *map;
294 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
295 if (map->virt <= virt &&
296 virt + size <= map->virt + map->size)
297 return map;
299 return NULL;
302 void __iomem *__init_refok
303 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
305 struct acpi_ioremap *map, *tmp_map;
306 unsigned long flags;
307 void __iomem *virt;
308 acpi_physical_address pg_off;
309 acpi_size pg_sz;
311 if (phys > ULONG_MAX) {
312 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
313 return NULL;
316 if (!acpi_gbl_permanent_mmap)
317 return __acpi_map_table((unsigned long)phys, size);
319 map = kzalloc(sizeof(*map), GFP_KERNEL);
320 if (!map)
321 return NULL;
323 pg_off = round_down(phys, PAGE_SIZE);
324 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
325 virt = acpi_os_ioremap(pg_off, pg_sz);
326 if (!virt) {
327 kfree(map);
328 return NULL;
331 INIT_LIST_HEAD(&map->list);
332 map->virt = virt;
333 map->phys = pg_off;
334 map->size = pg_sz;
335 kref_init(&map->ref);
337 spin_lock_irqsave(&acpi_ioremap_lock, flags);
338 /* Check if page has already been mapped. */
339 tmp_map = acpi_map_lookup(phys, size);
340 if (tmp_map) {
341 kref_get(&tmp_map->ref);
342 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
343 iounmap(map->virt);
344 kfree(map);
345 return tmp_map->virt + (phys - tmp_map->phys);
347 list_add_tail_rcu(&map->list, &acpi_ioremaps);
348 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
350 return map->virt + (phys - map->phys);
352 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
354 static void acpi_kref_del_iomap(struct kref *ref)
356 struct acpi_ioremap *map;
358 map = container_of(ref, struct acpi_ioremap, ref);
359 list_del_rcu(&map->list);
362 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
364 struct acpi_ioremap *map;
365 unsigned long flags;
366 int del;
368 if (!acpi_gbl_permanent_mmap) {
369 __acpi_unmap_table(virt, size);
370 return;
373 spin_lock_irqsave(&acpi_ioremap_lock, flags);
374 map = acpi_map_lookup_virt(virt, size);
375 if (!map) {
376 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
377 printk(KERN_ERR PREFIX "%s: bad address %p\n", __func__, virt);
378 dump_stack();
379 return;
382 del = kref_put(&map->ref, acpi_kref_del_iomap);
383 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
385 if (!del)
386 return;
388 synchronize_rcu();
389 iounmap(map->virt);
390 kfree(map);
392 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
394 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
396 if (!acpi_gbl_permanent_mmap)
397 __acpi_unmap_table(virt, size);
400 static int acpi_os_map_generic_address(struct acpi_generic_address *addr)
402 void __iomem *virt;
404 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
405 return 0;
407 if (!addr->address || !addr->bit_width)
408 return -EINVAL;
410 virt = acpi_os_map_memory(addr->address, addr->bit_width / 8);
411 if (!virt)
412 return -EIO;
414 return 0;
417 static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
419 void __iomem *virt;
420 unsigned long flags;
421 acpi_size size = addr->bit_width / 8;
423 if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
424 return;
426 if (!addr->address || !addr->bit_width)
427 return;
429 spin_lock_irqsave(&acpi_ioremap_lock, flags);
430 virt = acpi_map_vaddr_lookup(addr->address, size);
431 spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
433 acpi_os_unmap_memory(virt, size);
436 #ifdef ACPI_FUTURE_USAGE
437 acpi_status
438 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
440 if (!phys || !virt)
441 return AE_BAD_PARAMETER;
443 *phys = virt_to_phys(virt);
445 return AE_OK;
447 #endif
449 #define ACPI_MAX_OVERRIDE_LEN 100
451 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
453 acpi_status
454 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
455 acpi_string * new_val)
457 if (!init_val || !new_val)
458 return AE_BAD_PARAMETER;
460 *new_val = NULL;
461 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
462 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
463 acpi_os_name);
464 *new_val = acpi_os_name;
467 return AE_OK;
470 acpi_status
471 acpi_os_table_override(struct acpi_table_header * existing_table,
472 struct acpi_table_header ** new_table)
474 if (!existing_table || !new_table)
475 return AE_BAD_PARAMETER;
477 *new_table = NULL;
479 #ifdef CONFIG_ACPI_CUSTOM_DSDT
480 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
481 *new_table = (struct acpi_table_header *)AmlCode;
482 #endif
483 if (*new_table != NULL) {
484 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
485 "this is unsafe: tainting kernel\n",
486 existing_table->signature,
487 existing_table->oem_table_id);
488 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
490 return AE_OK;
493 static irqreturn_t acpi_irq(int irq, void *dev_id)
495 u32 handled;
497 handled = (*acpi_irq_handler) (acpi_irq_context);
499 if (handled) {
500 acpi_irq_handled++;
501 return IRQ_HANDLED;
502 } else {
503 acpi_irq_not_handled++;
504 return IRQ_NONE;
508 acpi_status
509 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
510 void *context)
512 unsigned int irq;
514 acpi_irq_stats_init();
517 * Ignore the GSI from the core, and use the value in our copy of the
518 * FADT. It may not be the same if an interrupt source override exists
519 * for the SCI.
521 gsi = acpi_gbl_FADT.sci_interrupt;
522 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
523 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
524 gsi);
525 return AE_OK;
528 acpi_irq_handler = handler;
529 acpi_irq_context = context;
530 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
531 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
532 return AE_NOT_ACQUIRED;
534 acpi_irq_irq = irq;
536 return AE_OK;
539 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
541 if (irq) {
542 free_irq(irq, acpi_irq);
543 acpi_irq_handler = NULL;
544 acpi_irq_irq = 0;
547 return AE_OK;
551 * Running in interpreter thread context, safe to sleep
554 void acpi_os_sleep(u64 ms)
556 schedule_timeout_interruptible(msecs_to_jiffies(ms));
559 void acpi_os_stall(u32 us)
561 while (us) {
562 u32 delay = 1000;
564 if (delay > us)
565 delay = us;
566 udelay(delay);
567 touch_nmi_watchdog();
568 us -= delay;
573 * Support ACPI 3.0 AML Timer operand
574 * Returns 64-bit free-running, monotonically increasing timer
575 * with 100ns granularity
577 u64 acpi_os_get_timer(void)
579 static u64 t;
581 #ifdef CONFIG_HPET
582 /* TBD: use HPET if available */
583 #endif
585 #ifdef CONFIG_X86_PM_TIMER
586 /* TBD: default to PM timer if HPET was not available */
587 #endif
588 if (!t)
589 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
591 return ++t;
594 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
596 u32 dummy;
598 if (!value)
599 value = &dummy;
601 *value = 0;
602 if (width <= 8) {
603 *(u8 *) value = inb(port);
604 } else if (width <= 16) {
605 *(u16 *) value = inw(port);
606 } else if (width <= 32) {
607 *(u32 *) value = inl(port);
608 } else {
609 BUG();
612 return AE_OK;
615 EXPORT_SYMBOL(acpi_os_read_port);
617 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
619 if (width <= 8) {
620 outb(value, port);
621 } else if (width <= 16) {
622 outw(value, port);
623 } else if (width <= 32) {
624 outl(value, port);
625 } else {
626 BUG();
629 return AE_OK;
632 EXPORT_SYMBOL(acpi_os_write_port);
634 acpi_status
635 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
637 void __iomem *virt_addr;
638 unsigned int size = width / 8;
639 bool unmap = false;
640 u32 dummy;
642 rcu_read_lock();
643 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
644 if (!virt_addr) {
645 rcu_read_unlock();
646 virt_addr = acpi_os_ioremap(phys_addr, size);
647 if (!virt_addr)
648 return AE_BAD_ADDRESS;
649 unmap = true;
652 if (!value)
653 value = &dummy;
655 switch (width) {
656 case 8:
657 *(u8 *) value = readb(virt_addr);
658 break;
659 case 16:
660 *(u16 *) value = readw(virt_addr);
661 break;
662 case 32:
663 *(u32 *) value = readl(virt_addr);
664 break;
665 default:
666 BUG();
669 if (unmap)
670 iounmap(virt_addr);
671 else
672 rcu_read_unlock();
674 return AE_OK;
677 acpi_status
678 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
680 void __iomem *virt_addr;
681 unsigned int size = width / 8;
682 bool unmap = false;
684 rcu_read_lock();
685 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
686 if (!virt_addr) {
687 rcu_read_unlock();
688 virt_addr = acpi_os_ioremap(phys_addr, size);
689 if (!virt_addr)
690 return AE_BAD_ADDRESS;
691 unmap = true;
694 switch (width) {
695 case 8:
696 writeb(value, virt_addr);
697 break;
698 case 16:
699 writew(value, virt_addr);
700 break;
701 case 32:
702 writel(value, virt_addr);
703 break;
704 default:
705 BUG();
708 if (unmap)
709 iounmap(virt_addr);
710 else
711 rcu_read_unlock();
713 return AE_OK;
716 acpi_status
717 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
718 u64 *value, u32 width)
720 int result, size;
721 u32 value32;
723 if (!value)
724 return AE_BAD_PARAMETER;
726 switch (width) {
727 case 8:
728 size = 1;
729 break;
730 case 16:
731 size = 2;
732 break;
733 case 32:
734 size = 4;
735 break;
736 default:
737 return AE_ERROR;
740 result = raw_pci_read(pci_id->segment, pci_id->bus,
741 PCI_DEVFN(pci_id->device, pci_id->function),
742 reg, size, &value32);
743 *value = value32;
745 return (result ? AE_ERROR : AE_OK);
748 acpi_status
749 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
750 u64 value, u32 width)
752 int result, size;
754 switch (width) {
755 case 8:
756 size = 1;
757 break;
758 case 16:
759 size = 2;
760 break;
761 case 32:
762 size = 4;
763 break;
764 default:
765 return AE_ERROR;
768 result = raw_pci_write(pci_id->segment, pci_id->bus,
769 PCI_DEVFN(pci_id->device, pci_id->function),
770 reg, size, value);
772 return (result ? AE_ERROR : AE_OK);
775 static void acpi_os_execute_deferred(struct work_struct *work)
777 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
779 if (dpc->wait)
780 acpi_os_wait_events_complete(NULL);
782 dpc->function(dpc->context);
783 kfree(dpc);
786 /*******************************************************************************
788 * FUNCTION: acpi_os_execute
790 * PARAMETERS: Type - Type of the callback
791 * Function - Function to be executed
792 * Context - Function parameters
794 * RETURN: Status
796 * DESCRIPTION: Depending on type, either queues function for deferred execution or
797 * immediately executes function on a separate thread.
799 ******************************************************************************/
801 static acpi_status __acpi_os_execute(acpi_execute_type type,
802 acpi_osd_exec_callback function, void *context, int hp)
804 acpi_status status = AE_OK;
805 struct acpi_os_dpc *dpc;
806 struct workqueue_struct *queue;
807 int ret;
808 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
809 "Scheduling function [%p(%p)] for deferred execution.\n",
810 function, context));
813 * Allocate/initialize DPC structure. Note that this memory will be
814 * freed by the callee. The kernel handles the work_struct list in a
815 * way that allows us to also free its memory inside the callee.
816 * Because we may want to schedule several tasks with different
817 * parameters we can't use the approach some kernel code uses of
818 * having a static work_struct.
821 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
822 if (!dpc)
823 return AE_NO_MEMORY;
825 dpc->function = function;
826 dpc->context = context;
829 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
830 * because the hotplug code may call driver .remove() functions,
831 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
832 * to flush these workqueues.
834 queue = hp ? kacpi_hotplug_wq :
835 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
836 dpc->wait = hp ? 1 : 0;
838 if (queue == kacpi_hotplug_wq)
839 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
840 else if (queue == kacpi_notify_wq)
841 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
842 else
843 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
846 * On some machines, a software-initiated SMI causes corruption unless
847 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
848 * typically it's done in GPE-related methods that are run via
849 * workqueues, so we can avoid the known corruption cases by always
850 * queueing on CPU 0.
852 ret = queue_work_on(0, queue, &dpc->work);
854 if (!ret) {
855 printk(KERN_ERR PREFIX
856 "Call to queue_work() failed.\n");
857 status = AE_ERROR;
858 kfree(dpc);
860 return status;
863 acpi_status acpi_os_execute(acpi_execute_type type,
864 acpi_osd_exec_callback function, void *context)
866 return __acpi_os_execute(type, function, context, 0);
868 EXPORT_SYMBOL(acpi_os_execute);
870 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
871 void *context)
873 return __acpi_os_execute(0, function, context, 1);
876 void acpi_os_wait_events_complete(void *context)
878 flush_workqueue(kacpid_wq);
879 flush_workqueue(kacpi_notify_wq);
882 EXPORT_SYMBOL(acpi_os_wait_events_complete);
885 * Deallocate the memory for a spinlock.
887 void acpi_os_delete_lock(acpi_spinlock handle)
889 return;
892 acpi_status
893 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
895 struct semaphore *sem = NULL;
897 sem = acpi_os_allocate(sizeof(struct semaphore));
898 if (!sem)
899 return AE_NO_MEMORY;
900 memset(sem, 0, sizeof(struct semaphore));
902 sema_init(sem, initial_units);
904 *handle = (acpi_handle *) sem;
906 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
907 *handle, initial_units));
909 return AE_OK;
913 * TODO: A better way to delete semaphores? Linux doesn't have a
914 * 'delete_semaphore()' function -- may result in an invalid
915 * pointer dereference for non-synchronized consumers. Should
916 * we at least check for blocked threads and signal/cancel them?
919 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
921 struct semaphore *sem = (struct semaphore *)handle;
923 if (!sem)
924 return AE_BAD_PARAMETER;
926 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
928 BUG_ON(!list_empty(&sem->wait_list));
929 kfree(sem);
930 sem = NULL;
932 return AE_OK;
936 * TODO: Support for units > 1?
938 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
940 acpi_status status = AE_OK;
941 struct semaphore *sem = (struct semaphore *)handle;
942 long jiffies;
943 int ret = 0;
945 if (!sem || (units < 1))
946 return AE_BAD_PARAMETER;
948 if (units > 1)
949 return AE_SUPPORT;
951 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
952 handle, units, timeout));
954 if (timeout == ACPI_WAIT_FOREVER)
955 jiffies = MAX_SCHEDULE_TIMEOUT;
956 else
957 jiffies = msecs_to_jiffies(timeout);
959 ret = down_timeout(sem, jiffies);
960 if (ret)
961 status = AE_TIME;
963 if (ACPI_FAILURE(status)) {
964 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
965 "Failed to acquire semaphore[%p|%d|%d], %s",
966 handle, units, timeout,
967 acpi_format_exception(status)));
968 } else {
969 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
970 "Acquired semaphore[%p|%d|%d]", handle,
971 units, timeout));
974 return status;
978 * TODO: Support for units > 1?
980 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
982 struct semaphore *sem = (struct semaphore *)handle;
984 if (!sem || (units < 1))
985 return AE_BAD_PARAMETER;
987 if (units > 1)
988 return AE_SUPPORT;
990 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
991 units));
993 up(sem);
995 return AE_OK;
998 #ifdef ACPI_FUTURE_USAGE
999 u32 acpi_os_get_line(char *buffer)
1002 #ifdef ENABLE_DEBUGGER
1003 if (acpi_in_debugger) {
1004 u32 chars;
1006 kdb_read(buffer, sizeof(line_buf));
1008 /* remove the CR kdb includes */
1009 chars = strlen(buffer) - 1;
1010 buffer[chars] = '\0';
1012 #endif
1014 return 0;
1016 #endif /* ACPI_FUTURE_USAGE */
1018 acpi_status acpi_os_signal(u32 function, void *info)
1020 switch (function) {
1021 case ACPI_SIGNAL_FATAL:
1022 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1023 break;
1024 case ACPI_SIGNAL_BREAKPOINT:
1026 * AML Breakpoint
1027 * ACPI spec. says to treat it as a NOP unless
1028 * you are debugging. So if/when we integrate
1029 * AML debugger into the kernel debugger its
1030 * hook will go here. But until then it is
1031 * not useful to print anything on breakpoints.
1033 break;
1034 default:
1035 break;
1038 return AE_OK;
1041 static int __init acpi_os_name_setup(char *str)
1043 char *p = acpi_os_name;
1044 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1046 if (!str || !*str)
1047 return 0;
1049 for (; count-- && str && *str; str++) {
1050 if (isalnum(*str) || *str == ' ' || *str == ':')
1051 *p++ = *str;
1052 else if (*str == '\'' || *str == '"')
1053 continue;
1054 else
1055 break;
1057 *p = 0;
1059 return 1;
1063 __setup("acpi_os_name=", acpi_os_name_setup);
1065 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1066 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1068 struct osi_setup_entry {
1069 char string[OSI_STRING_LENGTH_MAX];
1070 bool enable;
1073 static struct osi_setup_entry __initdata osi_setup_entries[OSI_STRING_ENTRIES_MAX];
1075 void __init acpi_osi_setup(char *str)
1077 struct osi_setup_entry *osi;
1078 bool enable = true;
1079 int i;
1081 if (!acpi_gbl_create_osi_method)
1082 return;
1084 if (str == NULL || *str == '\0') {
1085 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1086 acpi_gbl_create_osi_method = FALSE;
1087 return;
1090 if (*str == '!') {
1091 str++;
1092 enable = false;
1095 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1096 osi = &osi_setup_entries[i];
1097 if (!strcmp(osi->string, str)) {
1098 osi->enable = enable;
1099 break;
1100 } else if (osi->string[0] == '\0') {
1101 osi->enable = enable;
1102 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1103 break;
1108 static void __init set_osi_linux(unsigned int enable)
1110 if (osi_linux.enable != enable)
1111 osi_linux.enable = enable;
1113 if (osi_linux.enable)
1114 acpi_osi_setup("Linux");
1115 else
1116 acpi_osi_setup("!Linux");
1118 return;
1121 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1123 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1124 osi_linux.dmi = 0;
1125 set_osi_linux(enable);
1127 return;
1130 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1132 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1134 if (enable == -1)
1135 return;
1137 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1138 set_osi_linux(enable);
1140 return;
1144 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1146 * empty string disables _OSI
1147 * string starting with '!' disables that string
1148 * otherwise string is added to list, augmenting built-in strings
1150 static void __init acpi_osi_setup_late(void)
1152 struct osi_setup_entry *osi;
1153 char *str;
1154 int i;
1155 acpi_status status;
1157 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1158 osi = &osi_setup_entries[i];
1159 str = osi->string;
1161 if (*str == '\0')
1162 break;
1163 if (osi->enable) {
1164 status = acpi_install_interface(str);
1166 if (ACPI_SUCCESS(status))
1167 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1168 } else {
1169 status = acpi_remove_interface(str);
1171 if (ACPI_SUCCESS(status))
1172 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1177 static int __init osi_setup(char *str)
1179 if (str && !strcmp("Linux", str))
1180 acpi_cmdline_osi_linux(1);
1181 else if (str && !strcmp("!Linux", str))
1182 acpi_cmdline_osi_linux(0);
1183 else
1184 acpi_osi_setup(str);
1186 return 1;
1189 __setup("acpi_osi=", osi_setup);
1191 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1192 static int __init acpi_serialize_setup(char *str)
1194 printk(KERN_INFO PREFIX "serialize enabled\n");
1196 acpi_gbl_all_methods_serialized = TRUE;
1198 return 1;
1201 __setup("acpi_serialize", acpi_serialize_setup);
1203 /* Check of resource interference between native drivers and ACPI
1204 * OperationRegions (SystemIO and System Memory only).
1205 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1206 * in arbitrary AML code and can interfere with legacy drivers.
1207 * acpi_enforce_resources= can be set to:
1209 * - strict (default) (2)
1210 * -> further driver trying to access the resources will not load
1211 * - lax (1)
1212 * -> further driver trying to access the resources will load, but you
1213 * get a system message that something might go wrong...
1215 * - no (0)
1216 * -> ACPI Operation Region resources will not be registered
1219 #define ENFORCE_RESOURCES_STRICT 2
1220 #define ENFORCE_RESOURCES_LAX 1
1221 #define ENFORCE_RESOURCES_NO 0
1223 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1225 static int __init acpi_enforce_resources_setup(char *str)
1227 if (str == NULL || *str == '\0')
1228 return 0;
1230 if (!strcmp("strict", str))
1231 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1232 else if (!strcmp("lax", str))
1233 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1234 else if (!strcmp("no", str))
1235 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1237 return 1;
1240 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1242 /* Check for resource conflicts between ACPI OperationRegions and native
1243 * drivers */
1244 int acpi_check_resource_conflict(const struct resource *res)
1246 struct acpi_res_list *res_list_elem;
1247 int ioport = 0, clash = 0;
1249 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1250 return 0;
1251 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1252 return 0;
1254 ioport = res->flags & IORESOURCE_IO;
1256 spin_lock(&acpi_res_lock);
1257 list_for_each_entry(res_list_elem, &resource_list_head,
1258 resource_list) {
1259 if (ioport && (res_list_elem->resource_type
1260 != ACPI_ADR_SPACE_SYSTEM_IO))
1261 continue;
1262 if (!ioport && (res_list_elem->resource_type
1263 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1264 continue;
1266 if (res->end < res_list_elem->start
1267 || res_list_elem->end < res->start)
1268 continue;
1269 clash = 1;
1270 break;
1272 spin_unlock(&acpi_res_lock);
1274 if (clash) {
1275 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1276 printk(KERN_WARNING "ACPI: resource %s %pR"
1277 " conflicts with ACPI region %s "
1278 "[%s 0x%zx-0x%zx]\n",
1279 res->name, res, res_list_elem->name,
1280 (res_list_elem->resource_type ==
1281 ACPI_ADR_SPACE_SYSTEM_IO) ? "io" : "mem",
1282 (size_t) res_list_elem->start,
1283 (size_t) res_list_elem->end);
1284 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1285 printk(KERN_NOTICE "ACPI: This conflict may"
1286 " cause random problems and system"
1287 " instability\n");
1288 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1289 " for this device, you should use it instead of"
1290 " the native driver\n");
1292 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1293 return -EBUSY;
1295 return 0;
1297 EXPORT_SYMBOL(acpi_check_resource_conflict);
1299 int acpi_check_region(resource_size_t start, resource_size_t n,
1300 const char *name)
1302 struct resource res = {
1303 .start = start,
1304 .end = start + n - 1,
1305 .name = name,
1306 .flags = IORESOURCE_IO,
1309 return acpi_check_resource_conflict(&res);
1311 EXPORT_SYMBOL(acpi_check_region);
1314 * Let drivers know whether the resource checks are effective
1316 int acpi_resources_are_enforced(void)
1318 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1320 EXPORT_SYMBOL(acpi_resources_are_enforced);
1323 * Acquire a spinlock.
1325 * handle is a pointer to the spinlock_t.
1328 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1330 acpi_cpu_flags flags;
1331 spin_lock_irqsave(lockp, flags);
1332 return flags;
1336 * Release a spinlock. See above.
1339 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1341 spin_unlock_irqrestore(lockp, flags);
1344 #ifndef ACPI_USE_LOCAL_CACHE
1346 /*******************************************************************************
1348 * FUNCTION: acpi_os_create_cache
1350 * PARAMETERS: name - Ascii name for the cache
1351 * size - Size of each cached object
1352 * depth - Maximum depth of the cache (in objects) <ignored>
1353 * cache - Where the new cache object is returned
1355 * RETURN: status
1357 * DESCRIPTION: Create a cache object
1359 ******************************************************************************/
1361 acpi_status
1362 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1364 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1365 if (*cache == NULL)
1366 return AE_ERROR;
1367 else
1368 return AE_OK;
1371 /*******************************************************************************
1373 * FUNCTION: acpi_os_purge_cache
1375 * PARAMETERS: Cache - Handle to cache object
1377 * RETURN: Status
1379 * DESCRIPTION: Free all objects within the requested cache.
1381 ******************************************************************************/
1383 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1385 kmem_cache_shrink(cache);
1386 return (AE_OK);
1389 /*******************************************************************************
1391 * FUNCTION: acpi_os_delete_cache
1393 * PARAMETERS: Cache - Handle to cache object
1395 * RETURN: Status
1397 * DESCRIPTION: Free all objects within the requested cache and delete the
1398 * cache object.
1400 ******************************************************************************/
1402 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1404 kmem_cache_destroy(cache);
1405 return (AE_OK);
1408 /*******************************************************************************
1410 * FUNCTION: acpi_os_release_object
1412 * PARAMETERS: Cache - Handle to cache object
1413 * Object - The object to be released
1415 * RETURN: None
1417 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1418 * the object is deleted.
1420 ******************************************************************************/
1422 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1424 kmem_cache_free(cache, object);
1425 return (AE_OK);
1428 static inline int acpi_res_list_add(struct acpi_res_list *res)
1430 struct acpi_res_list *res_list_elem;
1432 list_for_each_entry(res_list_elem, &resource_list_head,
1433 resource_list) {
1435 if (res->resource_type == res_list_elem->resource_type &&
1436 res->start == res_list_elem->start &&
1437 res->end == res_list_elem->end) {
1440 * The Region(addr,len) already exist in the list,
1441 * just increase the count
1444 res_list_elem->count++;
1445 return 0;
1449 res->count = 1;
1450 list_add(&res->resource_list, &resource_list_head);
1451 return 1;
1454 static inline void acpi_res_list_del(struct acpi_res_list *res)
1456 struct acpi_res_list *res_list_elem;
1458 list_for_each_entry(res_list_elem, &resource_list_head,
1459 resource_list) {
1461 if (res->resource_type == res_list_elem->resource_type &&
1462 res->start == res_list_elem->start &&
1463 res->end == res_list_elem->end) {
1466 * If the res count is decreased to 0,
1467 * remove and free it
1470 if (--res_list_elem->count == 0) {
1471 list_del(&res_list_elem->resource_list);
1472 kfree(res_list_elem);
1474 return;
1479 acpi_status
1480 acpi_os_invalidate_address(
1481 u8 space_id,
1482 acpi_physical_address address,
1483 acpi_size length)
1485 struct acpi_res_list res;
1487 switch (space_id) {
1488 case ACPI_ADR_SPACE_SYSTEM_IO:
1489 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1490 /* Only interference checks against SystemIO and SystemMemory
1491 are needed */
1492 res.start = address;
1493 res.end = address + length - 1;
1494 res.resource_type = space_id;
1495 spin_lock(&acpi_res_lock);
1496 acpi_res_list_del(&res);
1497 spin_unlock(&acpi_res_lock);
1498 break;
1499 case ACPI_ADR_SPACE_PCI_CONFIG:
1500 case ACPI_ADR_SPACE_EC:
1501 case ACPI_ADR_SPACE_SMBUS:
1502 case ACPI_ADR_SPACE_CMOS:
1503 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1504 case ACPI_ADR_SPACE_DATA_TABLE:
1505 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1506 break;
1508 return AE_OK;
1511 /******************************************************************************
1513 * FUNCTION: acpi_os_validate_address
1515 * PARAMETERS: space_id - ACPI space ID
1516 * address - Physical address
1517 * length - Address length
1519 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1520 * should return AE_AML_ILLEGAL_ADDRESS.
1522 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1523 * the addresses accessed by AML operation regions.
1525 *****************************************************************************/
1527 acpi_status
1528 acpi_os_validate_address (
1529 u8 space_id,
1530 acpi_physical_address address,
1531 acpi_size length,
1532 char *name)
1534 struct acpi_res_list *res;
1535 int added;
1536 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1537 return AE_OK;
1539 switch (space_id) {
1540 case ACPI_ADR_SPACE_SYSTEM_IO:
1541 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1542 /* Only interference checks against SystemIO and SystemMemory
1543 are needed */
1544 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1545 if (!res)
1546 return AE_OK;
1547 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1548 strlcpy(res->name, name, 5);
1549 res->start = address;
1550 res->end = address + length - 1;
1551 res->resource_type = space_id;
1552 spin_lock(&acpi_res_lock);
1553 added = acpi_res_list_add(res);
1554 spin_unlock(&acpi_res_lock);
1555 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1556 "name: %s\n", added ? "Added" : "Already exist",
1557 (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1558 ? "SystemIO" : "System Memory",
1559 (unsigned long long)res->start,
1560 (unsigned long long)res->end,
1561 res->name);
1562 if (!added)
1563 kfree(res);
1564 break;
1565 case ACPI_ADR_SPACE_PCI_CONFIG:
1566 case ACPI_ADR_SPACE_EC:
1567 case ACPI_ADR_SPACE_SMBUS:
1568 case ACPI_ADR_SPACE_CMOS:
1569 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1570 case ACPI_ADR_SPACE_DATA_TABLE:
1571 case ACPI_ADR_SPACE_FIXED_HARDWARE:
1572 break;
1574 return AE_OK;
1576 #endif
1578 acpi_status __init acpi_os_initialize(void)
1580 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1581 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1582 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1583 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1585 return AE_OK;
1588 acpi_status __init acpi_os_initialize1(void)
1590 kacpid_wq = create_workqueue("kacpid");
1591 kacpi_notify_wq = create_workqueue("kacpi_notify");
1592 kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
1593 BUG_ON(!kacpid_wq);
1594 BUG_ON(!kacpi_notify_wq);
1595 BUG_ON(!kacpi_hotplug_wq);
1596 acpi_install_interface_handler(acpi_osi_handler);
1597 acpi_osi_setup_late();
1598 return AE_OK;
1601 acpi_status acpi_os_terminate(void)
1603 if (acpi_irq_handler) {
1604 acpi_os_remove_interrupt_handler(acpi_irq_irq,
1605 acpi_irq_handler);
1608 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1609 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1610 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1611 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1613 destroy_workqueue(kacpid_wq);
1614 destroy_workqueue(kacpi_notify_wq);
1615 destroy_workqueue(kacpi_hotplug_wq);
1617 return AE_OK;