x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / acpi / osl.c
blobe5f416c7f66e9e92e1ed988c3a709bc2820d56f4
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/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>
49 #include <asm/io.h>
50 #include <asm/uaccess.h>
52 #include <acpi/acpi.h>
53 #include <acpi/acpi_bus.h>
54 #include <acpi/processor.h>
55 #include "internal.h"
57 #define _COMPONENT ACPI_OS_SERVICES
58 ACPI_MODULE_NAME("osl");
59 #define PREFIX "ACPI: "
60 struct acpi_os_dpc {
61 acpi_osd_exec_callback function;
62 void *context;
63 struct work_struct work;
64 int wait;
67 #ifdef CONFIG_ACPI_CUSTOM_DSDT
68 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
69 #endif
71 #ifdef ENABLE_DEBUGGER
72 #include <linux/kdb.h>
74 /* stuff for debugger support */
75 int acpi_in_debugger;
76 EXPORT_SYMBOL(acpi_in_debugger);
78 extern char line_buf[80];
79 #endif /*ENABLE_DEBUGGER */
81 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
82 u32 pm1b_ctrl);
83 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
84 u32 val_b);
86 static acpi_osd_handler acpi_irq_handler;
87 static void *acpi_irq_context;
88 static struct workqueue_struct *kacpid_wq;
89 static struct workqueue_struct *kacpi_notify_wq;
90 static struct workqueue_struct *kacpi_hotplug_wq;
93 * This list of permanent mappings is for memory that may be accessed from
94 * interrupt context, where we can't do the ioremap().
96 struct acpi_ioremap {
97 struct list_head list;
98 void __iomem *virt;
99 acpi_physical_address phys;
100 acpi_size size;
101 unsigned long refcount;
104 static LIST_HEAD(acpi_ioremaps);
105 static DEFINE_MUTEX(acpi_ioremap_lock);
107 static void __init acpi_osi_setup_late(void);
110 * The story of _OSI(Linux)
112 * From pre-history through Linux-2.6.22,
113 * Linux responded TRUE upon a BIOS OSI(Linux) query.
115 * Unfortunately, reference BIOS writers got wind of this
116 * and put OSI(Linux) in their example code, quickly exposing
117 * this string as ill-conceived and opening the door to
118 * an un-bounded number of BIOS incompatibilities.
120 * For example, OSI(Linux) was used on resume to re-POST a
121 * video card on one system, because Linux at that time
122 * could not do a speedy restore in its native driver.
123 * But then upon gaining quick native restore capability,
124 * Linux has no way to tell the BIOS to skip the time-consuming
125 * POST -- putting Linux at a permanent performance disadvantage.
126 * On another system, the BIOS writer used OSI(Linux)
127 * to infer native OS support for IPMI! On other systems,
128 * OSI(Linux) simply got in the way of Linux claiming to
129 * be compatible with other operating systems, exposing
130 * BIOS issues such as skipped device initialization.
132 * So "Linux" turned out to be a really poor chose of
133 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
135 * BIOS writers should NOT query _OSI(Linux) on future systems.
136 * Linux will complain on the console when it sees it, and return FALSE.
137 * To get Linux to return TRUE for your system will require
138 * a kernel source update to add a DMI entry,
139 * or boot with "acpi_osi=Linux"
142 static struct osi_linux {
143 unsigned int enable:1;
144 unsigned int dmi:1;
145 unsigned int cmdline:1;
146 unsigned int default_disabling:1;
147 } osi_linux = {0, 0, 0, 0};
149 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
151 if (!strcmp("Linux", interface)) {
153 printk_once(KERN_NOTICE FW_BUG PREFIX
154 "BIOS _OSI(Linux) query %s%s\n",
155 osi_linux.enable ? "honored" : "ignored",
156 osi_linux.cmdline ? " via cmdline" :
157 osi_linux.dmi ? " via DMI" : "");
160 return supported;
163 static void __init acpi_request_region (struct acpi_generic_address *gas,
164 unsigned int length, char *desc)
166 u64 addr;
168 /* Handle possible alignment issues */
169 memcpy(&addr, &gas->address, sizeof(addr));
170 if (!addr || !length)
171 return;
173 /* Resources are never freed */
174 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
175 request_region(addr, length, desc);
176 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
177 request_mem_region(addr, length, desc);
180 static int __init acpi_reserve_resources(void)
182 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
183 "ACPI PM1a_EVT_BLK");
185 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
186 "ACPI PM1b_EVT_BLK");
188 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
189 "ACPI PM1a_CNT_BLK");
191 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
192 "ACPI PM1b_CNT_BLK");
194 if (acpi_gbl_FADT.pm_timer_length == 4)
195 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
197 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
198 "ACPI PM2_CNT_BLK");
200 /* Length of GPE blocks must be a non-negative multiple of 2 */
202 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
203 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
204 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
206 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
207 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
208 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
210 return 0;
212 device_initcall(acpi_reserve_resources);
214 void acpi_os_printf(const char *fmt, ...)
216 va_list args;
217 va_start(args, fmt);
218 acpi_os_vprintf(fmt, args);
219 va_end(args);
222 void acpi_os_vprintf(const char *fmt, va_list args)
224 static char buffer[512];
226 vsprintf(buffer, fmt, args);
228 #ifdef ENABLE_DEBUGGER
229 if (acpi_in_debugger) {
230 kdb_printf("%s", buffer);
231 } else {
232 printk(KERN_CONT "%s", buffer);
234 #else
235 printk(KERN_CONT "%s", buffer);
236 #endif
239 #ifdef CONFIG_KEXEC
240 static unsigned long acpi_rsdp;
241 static int __init setup_acpi_rsdp(char *arg)
243 acpi_rsdp = simple_strtoul(arg, NULL, 16);
244 return 0;
246 early_param("acpi_rsdp", setup_acpi_rsdp);
247 #endif
249 acpi_physical_address __init acpi_os_get_root_pointer(void)
251 #ifdef CONFIG_KEXEC
252 if (acpi_rsdp)
253 return acpi_rsdp;
254 #endif
256 if (efi_enabled(EFI_CONFIG_TABLES)) {
257 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
258 return efi.acpi20;
259 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
260 return efi.acpi;
261 else {
262 printk(KERN_ERR PREFIX
263 "System description tables not found\n");
264 return 0;
266 } else {
267 acpi_physical_address pa = 0;
269 acpi_find_root_pointer(&pa);
270 return pa;
274 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
275 static struct acpi_ioremap *
276 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
278 struct acpi_ioremap *map;
280 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
281 if (map->phys <= phys &&
282 phys + size <= map->phys + map->size)
283 return map;
285 return NULL;
288 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
289 static void __iomem *
290 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
292 struct acpi_ioremap *map;
294 map = acpi_map_lookup(phys, size);
295 if (map)
296 return map->virt + (phys - map->phys);
298 return NULL;
301 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
303 struct acpi_ioremap *map;
304 void __iomem *virt = NULL;
306 mutex_lock(&acpi_ioremap_lock);
307 map = acpi_map_lookup(phys, size);
308 if (map) {
309 virt = map->virt + (phys - map->phys);
310 map->refcount++;
312 mutex_unlock(&acpi_ioremap_lock);
313 return virt;
315 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
317 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
318 static struct acpi_ioremap *
319 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
321 struct acpi_ioremap *map;
323 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
324 if (map->virt <= virt &&
325 virt + size <= map->virt + map->size)
326 return map;
328 return NULL;
331 #ifndef CONFIG_IA64
332 #define should_use_kmap(pfn) page_is_ram(pfn)
333 #else
334 /* ioremap will take care of cache attributes */
335 #define should_use_kmap(pfn) 0
336 #endif
338 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
340 unsigned long pfn;
342 pfn = pg_off >> PAGE_SHIFT;
343 if (should_use_kmap(pfn)) {
344 if (pg_sz > PAGE_SIZE)
345 return NULL;
346 return (void __iomem __force *)kmap(pfn_to_page(pfn));
347 } else
348 return acpi_os_ioremap(pg_off, pg_sz);
351 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
353 unsigned long pfn;
355 pfn = pg_off >> PAGE_SHIFT;
356 if (should_use_kmap(pfn))
357 kunmap(pfn_to_page(pfn));
358 else
359 iounmap(vaddr);
362 void __iomem *__init_refok
363 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
365 struct acpi_ioremap *map;
366 void __iomem *virt;
367 acpi_physical_address pg_off;
368 acpi_size pg_sz;
370 if (phys > ULONG_MAX) {
371 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
372 return NULL;
375 if (!acpi_gbl_permanent_mmap)
376 return __acpi_map_table((unsigned long)phys, size);
378 mutex_lock(&acpi_ioremap_lock);
379 /* Check if there's a suitable mapping already. */
380 map = acpi_map_lookup(phys, size);
381 if (map) {
382 map->refcount++;
383 goto out;
386 map = kzalloc(sizeof(*map), GFP_KERNEL);
387 if (!map) {
388 mutex_unlock(&acpi_ioremap_lock);
389 return NULL;
392 pg_off = round_down(phys, PAGE_SIZE);
393 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
394 virt = acpi_map(pg_off, pg_sz);
395 if (!virt) {
396 mutex_unlock(&acpi_ioremap_lock);
397 kfree(map);
398 return NULL;
401 INIT_LIST_HEAD(&map->list);
402 map->virt = virt;
403 map->phys = pg_off;
404 map->size = pg_sz;
405 map->refcount = 1;
407 list_add_tail_rcu(&map->list, &acpi_ioremaps);
409 out:
410 mutex_unlock(&acpi_ioremap_lock);
411 return map->virt + (phys - map->phys);
413 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
415 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
417 if (!--map->refcount)
418 list_del_rcu(&map->list);
421 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
423 if (!map->refcount) {
424 synchronize_rcu();
425 acpi_unmap(map->phys, map->virt);
426 kfree(map);
430 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
432 struct acpi_ioremap *map;
434 if (!acpi_gbl_permanent_mmap) {
435 __acpi_unmap_table(virt, size);
436 return;
439 mutex_lock(&acpi_ioremap_lock);
440 map = acpi_map_lookup_virt(virt, size);
441 if (!map) {
442 mutex_unlock(&acpi_ioremap_lock);
443 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
444 return;
446 acpi_os_drop_map_ref(map);
447 mutex_unlock(&acpi_ioremap_lock);
449 acpi_os_map_cleanup(map);
451 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
453 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
455 if (!acpi_gbl_permanent_mmap)
456 __acpi_unmap_table(virt, size);
459 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
461 u64 addr;
462 void __iomem *virt;
464 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
465 return 0;
467 /* Handle possible alignment issues */
468 memcpy(&addr, &gas->address, sizeof(addr));
469 if (!addr || !gas->bit_width)
470 return -EINVAL;
472 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
473 if (!virt)
474 return -EIO;
476 return 0;
478 EXPORT_SYMBOL(acpi_os_map_generic_address);
480 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
482 u64 addr;
483 struct acpi_ioremap *map;
485 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
486 return;
488 /* Handle possible alignment issues */
489 memcpy(&addr, &gas->address, sizeof(addr));
490 if (!addr || !gas->bit_width)
491 return;
493 mutex_lock(&acpi_ioremap_lock);
494 map = acpi_map_lookup(addr, gas->bit_width / 8);
495 if (!map) {
496 mutex_unlock(&acpi_ioremap_lock);
497 return;
499 acpi_os_drop_map_ref(map);
500 mutex_unlock(&acpi_ioremap_lock);
502 acpi_os_map_cleanup(map);
504 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
506 #ifdef ACPI_FUTURE_USAGE
507 acpi_status
508 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
510 if (!phys || !virt)
511 return AE_BAD_PARAMETER;
513 *phys = virt_to_phys(virt);
515 return AE_OK;
517 #endif
519 #define ACPI_MAX_OVERRIDE_LEN 100
521 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
523 acpi_status
524 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
525 acpi_string * new_val)
527 if (!init_val || !new_val)
528 return AE_BAD_PARAMETER;
530 *new_val = NULL;
531 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
532 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
533 acpi_os_name);
534 *new_val = acpi_os_name;
537 return AE_OK;
540 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
541 #include <linux/earlycpio.h>
542 #include <linux/memblock.h>
544 static u64 acpi_tables_addr;
545 static int all_tables_size;
547 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
548 u8 __init acpi_table_checksum(u8 *buffer, u32 length)
550 u8 sum = 0;
551 u8 *end = buffer + length;
553 while (buffer < end)
554 sum = (u8) (sum + *(buffer++));
555 return sum;
558 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
559 static const char * const table_sigs[] = {
560 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
561 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
562 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
563 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
564 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
565 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
566 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
567 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
568 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
570 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
572 /* Must not increase 10 or needs code modification below */
573 #define ACPI_OVERRIDE_TABLES 10
575 void __init acpi_initrd_override(void *data, size_t size)
577 int sig, no, table_nr = 0, total_offset = 0;
578 long offset = 0;
579 struct acpi_table_header *table;
580 char cpio_path[32] = "kernel/firmware/acpi/";
581 struct cpio_data file;
582 struct cpio_data early_initrd_files[ACPI_OVERRIDE_TABLES];
583 char *p;
585 if (data == NULL || size == 0)
586 return;
588 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
589 file = find_cpio_data(cpio_path, data, size, &offset);
590 if (!file.data)
591 break;
593 data += offset;
594 size -= offset;
596 if (file.size < sizeof(struct acpi_table_header)) {
597 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
598 cpio_path, file.name);
599 continue;
602 table = file.data;
604 for (sig = 0; table_sigs[sig]; sig++)
605 if (!memcmp(table->signature, table_sigs[sig], 4))
606 break;
608 if (!table_sigs[sig]) {
609 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
610 cpio_path, file.name);
611 continue;
613 if (file.size != table->length) {
614 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
615 cpio_path, file.name);
616 continue;
618 if (acpi_table_checksum(file.data, table->length)) {
619 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
620 cpio_path, file.name);
621 continue;
624 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
625 table->signature, cpio_path, file.name, table->length);
627 all_tables_size += table->length;
628 early_initrd_files[table_nr].data = file.data;
629 early_initrd_files[table_nr].size = file.size;
630 table_nr++;
632 if (table_nr == 0)
633 return;
635 acpi_tables_addr =
636 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
637 all_tables_size, PAGE_SIZE);
638 if (!acpi_tables_addr) {
639 WARN_ON(1);
640 return;
643 * Only calling e820_add_reserve does not work and the
644 * tables are invalid (memory got used) later.
645 * memblock_reserve works as expected and the tables won't get modified.
646 * But it's not enough on X86 because ioremap will
647 * complain later (used by acpi_os_map_memory) that the pages
648 * that should get mapped are not marked "reserved".
649 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
650 * works fine.
652 memblock_reserve(acpi_tables_addr, all_tables_size);
653 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
655 p = early_ioremap(acpi_tables_addr, all_tables_size);
657 for (no = 0; no < table_nr; no++) {
658 memcpy(p + total_offset, early_initrd_files[no].data,
659 early_initrd_files[no].size);
660 total_offset += early_initrd_files[no].size;
662 early_iounmap(p, all_tables_size);
664 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
666 static void acpi_table_taint(struct acpi_table_header *table)
668 pr_warn(PREFIX
669 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
670 table->signature, table->oem_table_id);
671 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
675 acpi_status
676 acpi_os_table_override(struct acpi_table_header * existing_table,
677 struct acpi_table_header ** new_table)
679 if (!existing_table || !new_table)
680 return AE_BAD_PARAMETER;
682 *new_table = NULL;
684 #ifdef CONFIG_ACPI_CUSTOM_DSDT
685 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
686 *new_table = (struct acpi_table_header *)AmlCode;
687 #endif
688 if (*new_table != NULL)
689 acpi_table_taint(existing_table);
690 return AE_OK;
693 acpi_status
694 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
695 acpi_physical_address *address,
696 u32 *table_length)
698 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
699 *table_length = 0;
700 *address = 0;
701 return AE_OK;
702 #else
703 int table_offset = 0;
704 struct acpi_table_header *table;
706 *table_length = 0;
707 *address = 0;
709 if (!acpi_tables_addr)
710 return AE_OK;
712 do {
713 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
714 WARN_ON(1);
715 return AE_OK;
718 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
719 ACPI_HEADER_SIZE);
721 if (table_offset + table->length > all_tables_size) {
722 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
723 WARN_ON(1);
724 return AE_OK;
727 table_offset += table->length;
729 if (memcmp(existing_table->signature, table->signature, 4)) {
730 acpi_os_unmap_memory(table,
731 ACPI_HEADER_SIZE);
732 continue;
735 /* Only override tables with matching oem id */
736 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
737 ACPI_OEM_TABLE_ID_SIZE)) {
738 acpi_os_unmap_memory(table,
739 ACPI_HEADER_SIZE);
740 continue;
743 table_offset -= table->length;
744 *table_length = table->length;
745 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
746 *address = acpi_tables_addr + table_offset;
747 break;
748 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
750 if (*address != 0)
751 acpi_table_taint(existing_table);
752 return AE_OK;
753 #endif
756 static irqreturn_t acpi_irq(int irq, void *dev_id)
758 u32 handled;
760 handled = (*acpi_irq_handler) (acpi_irq_context);
762 if (handled) {
763 acpi_irq_handled++;
764 return IRQ_HANDLED;
765 } else {
766 acpi_irq_not_handled++;
767 return IRQ_NONE;
771 acpi_status
772 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
773 void *context)
775 unsigned int irq;
777 acpi_irq_stats_init();
780 * ACPI interrupts different from the SCI in our copy of the FADT are
781 * not supported.
783 if (gsi != acpi_gbl_FADT.sci_interrupt)
784 return AE_BAD_PARAMETER;
786 if (acpi_irq_handler)
787 return AE_ALREADY_ACQUIRED;
789 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
790 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
791 gsi);
792 return AE_OK;
795 acpi_irq_handler = handler;
796 acpi_irq_context = context;
797 if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
798 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
799 acpi_irq_handler = NULL;
800 return AE_NOT_ACQUIRED;
803 return AE_OK;
806 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
808 if (irq != acpi_gbl_FADT.sci_interrupt)
809 return AE_BAD_PARAMETER;
811 free_irq(irq, acpi_irq);
812 acpi_irq_handler = NULL;
814 return AE_OK;
818 * Running in interpreter thread context, safe to sleep
821 void acpi_os_sleep(u64 ms)
823 schedule_timeout_interruptible(msecs_to_jiffies(ms));
826 void acpi_os_stall(u32 us)
828 while (us) {
829 u32 delay = 1000;
831 if (delay > us)
832 delay = us;
833 udelay(delay);
834 touch_nmi_watchdog();
835 us -= delay;
840 * Support ACPI 3.0 AML Timer operand
841 * Returns 64-bit free-running, monotonically increasing timer
842 * with 100ns granularity
844 u64 acpi_os_get_timer(void)
846 u64 time_ns = ktime_to_ns(ktime_get());
847 do_div(time_ns, 100);
848 return time_ns;
851 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
853 u32 dummy;
855 if (!value)
856 value = &dummy;
858 *value = 0;
859 if (width <= 8) {
860 *(u8 *) value = inb(port);
861 } else if (width <= 16) {
862 *(u16 *) value = inw(port);
863 } else if (width <= 32) {
864 *(u32 *) value = inl(port);
865 } else {
866 BUG();
869 return AE_OK;
872 EXPORT_SYMBOL(acpi_os_read_port);
874 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
876 if (width <= 8) {
877 outb(value, port);
878 } else if (width <= 16) {
879 outw(value, port);
880 } else if (width <= 32) {
881 outl(value, port);
882 } else {
883 BUG();
886 return AE_OK;
889 EXPORT_SYMBOL(acpi_os_write_port);
891 #ifdef readq
892 static inline u64 read64(const volatile void __iomem *addr)
894 return readq(addr);
896 #else
897 static inline u64 read64(const volatile void __iomem *addr)
899 u64 l, h;
900 l = readl(addr);
901 h = readl(addr+4);
902 return l | (h << 32);
904 #endif
906 acpi_status
907 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
909 void __iomem *virt_addr;
910 unsigned int size = width / 8;
911 bool unmap = false;
912 u64 dummy;
914 rcu_read_lock();
915 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
916 if (!virt_addr) {
917 rcu_read_unlock();
918 virt_addr = acpi_os_ioremap(phys_addr, size);
919 if (!virt_addr)
920 return AE_BAD_ADDRESS;
921 unmap = true;
924 if (!value)
925 value = &dummy;
927 switch (width) {
928 case 8:
929 *(u8 *) value = readb(virt_addr);
930 break;
931 case 16:
932 *(u16 *) value = readw(virt_addr);
933 break;
934 case 32:
935 *(u32 *) value = readl(virt_addr);
936 break;
937 case 64:
938 *(u64 *) value = read64(virt_addr);
939 break;
940 default:
941 BUG();
944 if (unmap)
945 iounmap(virt_addr);
946 else
947 rcu_read_unlock();
949 return AE_OK;
952 #ifdef writeq
953 static inline void write64(u64 val, volatile void __iomem *addr)
955 writeq(val, addr);
957 #else
958 static inline void write64(u64 val, volatile void __iomem *addr)
960 writel(val, addr);
961 writel(val>>32, addr+4);
963 #endif
965 acpi_status
966 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
968 void __iomem *virt_addr;
969 unsigned int size = width / 8;
970 bool unmap = false;
972 rcu_read_lock();
973 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
974 if (!virt_addr) {
975 rcu_read_unlock();
976 virt_addr = acpi_os_ioremap(phys_addr, size);
977 if (!virt_addr)
978 return AE_BAD_ADDRESS;
979 unmap = true;
982 switch (width) {
983 case 8:
984 writeb(value, virt_addr);
985 break;
986 case 16:
987 writew(value, virt_addr);
988 break;
989 case 32:
990 writel(value, virt_addr);
991 break;
992 case 64:
993 write64(value, virt_addr);
994 break;
995 default:
996 BUG();
999 if (unmap)
1000 iounmap(virt_addr);
1001 else
1002 rcu_read_unlock();
1004 return AE_OK;
1007 acpi_status
1008 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1009 u64 *value, u32 width)
1011 int result, size;
1012 u32 value32;
1014 if (!value)
1015 return AE_BAD_PARAMETER;
1017 switch (width) {
1018 case 8:
1019 size = 1;
1020 break;
1021 case 16:
1022 size = 2;
1023 break;
1024 case 32:
1025 size = 4;
1026 break;
1027 default:
1028 return AE_ERROR;
1031 result = raw_pci_read(pci_id->segment, pci_id->bus,
1032 PCI_DEVFN(pci_id->device, pci_id->function),
1033 reg, size, &value32);
1034 *value = value32;
1036 return (result ? AE_ERROR : AE_OK);
1039 acpi_status
1040 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1041 u64 value, u32 width)
1043 int result, size;
1045 switch (width) {
1046 case 8:
1047 size = 1;
1048 break;
1049 case 16:
1050 size = 2;
1051 break;
1052 case 32:
1053 size = 4;
1054 break;
1055 default:
1056 return AE_ERROR;
1059 result = raw_pci_write(pci_id->segment, pci_id->bus,
1060 PCI_DEVFN(pci_id->device, pci_id->function),
1061 reg, size, value);
1063 return (result ? AE_ERROR : AE_OK);
1066 static void acpi_os_execute_deferred(struct work_struct *work)
1068 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1070 if (dpc->wait)
1071 acpi_os_wait_events_complete();
1073 dpc->function(dpc->context);
1074 kfree(dpc);
1077 /*******************************************************************************
1079 * FUNCTION: acpi_os_execute
1081 * PARAMETERS: Type - Type of the callback
1082 * Function - Function to be executed
1083 * Context - Function parameters
1085 * RETURN: Status
1087 * DESCRIPTION: Depending on type, either queues function for deferred execution or
1088 * immediately executes function on a separate thread.
1090 ******************************************************************************/
1092 static acpi_status __acpi_os_execute(acpi_execute_type type,
1093 acpi_osd_exec_callback function, void *context, int hp)
1095 acpi_status status = AE_OK;
1096 struct acpi_os_dpc *dpc;
1097 struct workqueue_struct *queue;
1098 int ret;
1099 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1100 "Scheduling function [%p(%p)] for deferred execution.\n",
1101 function, context));
1104 * Allocate/initialize DPC structure. Note that this memory will be
1105 * freed by the callee. The kernel handles the work_struct list in a
1106 * way that allows us to also free its memory inside the callee.
1107 * Because we may want to schedule several tasks with different
1108 * parameters we can't use the approach some kernel code uses of
1109 * having a static work_struct.
1112 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1113 if (!dpc)
1114 return AE_NO_MEMORY;
1116 dpc->function = function;
1117 dpc->context = context;
1120 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1121 * because the hotplug code may call driver .remove() functions,
1122 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1123 * to flush these workqueues.
1125 * To prevent lockdep from complaining unnecessarily, make sure that
1126 * there is a different static lockdep key for each workqueue by using
1127 * INIT_WORK() for each of them separately.
1129 if (hp) {
1130 queue = kacpi_hotplug_wq;
1131 dpc->wait = 1;
1132 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1133 } else if (type == OSL_NOTIFY_HANDLER) {
1134 queue = kacpi_notify_wq;
1135 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1136 } else {
1137 queue = kacpid_wq;
1138 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1142 * On some machines, a software-initiated SMI causes corruption unless
1143 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
1144 * typically it's done in GPE-related methods that are run via
1145 * workqueues, so we can avoid the known corruption cases by always
1146 * queueing on CPU 0.
1148 ret = queue_work_on(0, queue, &dpc->work);
1150 if (!ret) {
1151 printk(KERN_ERR PREFIX
1152 "Call to queue_work() failed.\n");
1153 status = AE_ERROR;
1154 kfree(dpc);
1156 return status;
1159 acpi_status acpi_os_execute(acpi_execute_type type,
1160 acpi_osd_exec_callback function, void *context)
1162 return __acpi_os_execute(type, function, context, 0);
1164 EXPORT_SYMBOL(acpi_os_execute);
1166 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1167 void *context)
1169 return __acpi_os_execute(0, function, context, 1);
1171 EXPORT_SYMBOL(acpi_os_hotplug_execute);
1173 void acpi_os_wait_events_complete(void)
1175 flush_workqueue(kacpid_wq);
1176 flush_workqueue(kacpi_notify_wq);
1179 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1181 acpi_status
1182 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1184 struct semaphore *sem = NULL;
1186 sem = acpi_os_allocate(sizeof(struct semaphore));
1187 if (!sem)
1188 return AE_NO_MEMORY;
1189 memset(sem, 0, sizeof(struct semaphore));
1191 sema_init(sem, initial_units);
1193 *handle = (acpi_handle *) sem;
1195 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1196 *handle, initial_units));
1198 return AE_OK;
1202 * TODO: A better way to delete semaphores? Linux doesn't have a
1203 * 'delete_semaphore()' function -- may result in an invalid
1204 * pointer dereference for non-synchronized consumers. Should
1205 * we at least check for blocked threads and signal/cancel them?
1208 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1210 struct semaphore *sem = (struct semaphore *)handle;
1212 if (!sem)
1213 return AE_BAD_PARAMETER;
1215 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1217 BUG_ON(!list_empty(&sem->wait_list));
1218 kfree(sem);
1219 sem = NULL;
1221 return AE_OK;
1225 * TODO: Support for units > 1?
1227 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1229 acpi_status status = AE_OK;
1230 struct semaphore *sem = (struct semaphore *)handle;
1231 long jiffies;
1232 int ret = 0;
1234 if (!sem || (units < 1))
1235 return AE_BAD_PARAMETER;
1237 if (units > 1)
1238 return AE_SUPPORT;
1240 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1241 handle, units, timeout));
1243 if (timeout == ACPI_WAIT_FOREVER)
1244 jiffies = MAX_SCHEDULE_TIMEOUT;
1245 else
1246 jiffies = msecs_to_jiffies(timeout);
1248 ret = down_timeout(sem, jiffies);
1249 if (ret)
1250 status = AE_TIME;
1252 if (ACPI_FAILURE(status)) {
1253 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1254 "Failed to acquire semaphore[%p|%d|%d], %s",
1255 handle, units, timeout,
1256 acpi_format_exception(status)));
1257 } else {
1258 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1259 "Acquired semaphore[%p|%d|%d]", handle,
1260 units, timeout));
1263 return status;
1267 * TODO: Support for units > 1?
1269 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1271 struct semaphore *sem = (struct semaphore *)handle;
1273 if (!sem || (units < 1))
1274 return AE_BAD_PARAMETER;
1276 if (units > 1)
1277 return AE_SUPPORT;
1279 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1280 units));
1282 up(sem);
1284 return AE_OK;
1287 #ifdef ACPI_FUTURE_USAGE
1288 u32 acpi_os_get_line(char *buffer)
1291 #ifdef ENABLE_DEBUGGER
1292 if (acpi_in_debugger) {
1293 u32 chars;
1295 kdb_read(buffer, sizeof(line_buf));
1297 /* remove the CR kdb includes */
1298 chars = strlen(buffer) - 1;
1299 buffer[chars] = '\0';
1301 #endif
1303 return 0;
1305 #endif /* ACPI_FUTURE_USAGE */
1307 acpi_status acpi_os_signal(u32 function, void *info)
1309 switch (function) {
1310 case ACPI_SIGNAL_FATAL:
1311 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1312 break;
1313 case ACPI_SIGNAL_BREAKPOINT:
1315 * AML Breakpoint
1316 * ACPI spec. says to treat it as a NOP unless
1317 * you are debugging. So if/when we integrate
1318 * AML debugger into the kernel debugger its
1319 * hook will go here. But until then it is
1320 * not useful to print anything on breakpoints.
1322 break;
1323 default:
1324 break;
1327 return AE_OK;
1330 static int __init acpi_os_name_setup(char *str)
1332 char *p = acpi_os_name;
1333 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1335 if (!str || !*str)
1336 return 0;
1338 for (; count-- && str && *str; str++) {
1339 if (isalnum(*str) || *str == ' ' || *str == ':')
1340 *p++ = *str;
1341 else if (*str == '\'' || *str == '"')
1342 continue;
1343 else
1344 break;
1346 *p = 0;
1348 return 1;
1352 __setup("acpi_os_name=", acpi_os_name_setup);
1354 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1355 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1357 struct osi_setup_entry {
1358 char string[OSI_STRING_LENGTH_MAX];
1359 bool enable;
1362 static struct osi_setup_entry
1363 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1364 {"Module Device", true},
1365 {"Processor Device", true},
1366 {"3.0 _SCP Extensions", true},
1367 {"Processor Aggregator Device", true},
1370 void __init acpi_osi_setup(char *str)
1372 struct osi_setup_entry *osi;
1373 bool enable = true;
1374 int i;
1376 if (!acpi_gbl_create_osi_method)
1377 return;
1379 if (str == NULL || *str == '\0') {
1380 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1381 acpi_gbl_create_osi_method = FALSE;
1382 return;
1385 if (*str == '!') {
1386 str++;
1387 if (*str == '\0') {
1388 osi_linux.default_disabling = 1;
1389 return;
1390 } else if (*str == '*') {
1391 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1392 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1393 osi = &osi_setup_entries[i];
1394 osi->enable = false;
1396 return;
1398 enable = false;
1401 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1402 osi = &osi_setup_entries[i];
1403 if (!strcmp(osi->string, str)) {
1404 osi->enable = enable;
1405 break;
1406 } else if (osi->string[0] == '\0') {
1407 osi->enable = enable;
1408 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1409 break;
1414 static void __init set_osi_linux(unsigned int enable)
1416 if (osi_linux.enable != enable)
1417 osi_linux.enable = enable;
1419 if (osi_linux.enable)
1420 acpi_osi_setup("Linux");
1421 else
1422 acpi_osi_setup("!Linux");
1424 return;
1427 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1429 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1430 osi_linux.dmi = 0;
1431 set_osi_linux(enable);
1433 return;
1436 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1438 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1440 if (enable == -1)
1441 return;
1443 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1444 set_osi_linux(enable);
1446 return;
1450 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1452 * empty string disables _OSI
1453 * string starting with '!' disables that string
1454 * otherwise string is added to list, augmenting built-in strings
1456 static void __init acpi_osi_setup_late(void)
1458 struct osi_setup_entry *osi;
1459 char *str;
1460 int i;
1461 acpi_status status;
1463 if (osi_linux.default_disabling) {
1464 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1466 if (ACPI_SUCCESS(status))
1467 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1470 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1471 osi = &osi_setup_entries[i];
1472 str = osi->string;
1474 if (*str == '\0')
1475 break;
1476 if (osi->enable) {
1477 status = acpi_install_interface(str);
1479 if (ACPI_SUCCESS(status))
1480 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1481 } else {
1482 status = acpi_remove_interface(str);
1484 if (ACPI_SUCCESS(status))
1485 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1490 static int __init osi_setup(char *str)
1492 if (str && !strcmp("Linux", str))
1493 acpi_cmdline_osi_linux(1);
1494 else if (str && !strcmp("!Linux", str))
1495 acpi_cmdline_osi_linux(0);
1496 else
1497 acpi_osi_setup(str);
1499 return 1;
1502 __setup("acpi_osi=", osi_setup);
1504 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1505 static int __init acpi_serialize_setup(char *str)
1507 printk(KERN_INFO PREFIX "serialize enabled\n");
1509 acpi_gbl_all_methods_serialized = TRUE;
1511 return 1;
1514 __setup("acpi_serialize", acpi_serialize_setup);
1516 /* Check of resource interference between native drivers and ACPI
1517 * OperationRegions (SystemIO and System Memory only).
1518 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1519 * in arbitrary AML code and can interfere with legacy drivers.
1520 * acpi_enforce_resources= can be set to:
1522 * - strict (default) (2)
1523 * -> further driver trying to access the resources will not load
1524 * - lax (1)
1525 * -> further driver trying to access the resources will load, but you
1526 * get a system message that something might go wrong...
1528 * - no (0)
1529 * -> ACPI Operation Region resources will not be registered
1532 #define ENFORCE_RESOURCES_STRICT 2
1533 #define ENFORCE_RESOURCES_LAX 1
1534 #define ENFORCE_RESOURCES_NO 0
1536 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1538 static int __init acpi_enforce_resources_setup(char *str)
1540 if (str == NULL || *str == '\0')
1541 return 0;
1543 if (!strcmp("strict", str))
1544 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1545 else if (!strcmp("lax", str))
1546 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1547 else if (!strcmp("no", str))
1548 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1550 return 1;
1553 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1555 /* Check for resource conflicts between ACPI OperationRegions and native
1556 * drivers */
1557 int acpi_check_resource_conflict(const struct resource *res)
1559 acpi_adr_space_type space_id;
1560 acpi_size length;
1561 u8 warn = 0;
1562 int clash = 0;
1564 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1565 return 0;
1566 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1567 return 0;
1569 if (res->flags & IORESOURCE_IO)
1570 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1571 else
1572 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1574 length = resource_size(res);
1575 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1576 warn = 1;
1577 clash = acpi_check_address_range(space_id, res->start, length, warn);
1579 if (clash) {
1580 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1581 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1582 printk(KERN_NOTICE "ACPI: This conflict may"
1583 " cause random problems and system"
1584 " instability\n");
1585 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1586 " for this device, you should use it instead of"
1587 " the native driver\n");
1589 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1590 return -EBUSY;
1592 return 0;
1594 EXPORT_SYMBOL(acpi_check_resource_conflict);
1596 int acpi_check_region(resource_size_t start, resource_size_t n,
1597 const char *name)
1599 struct resource res = {
1600 .start = start,
1601 .end = start + n - 1,
1602 .name = name,
1603 .flags = IORESOURCE_IO,
1606 return acpi_check_resource_conflict(&res);
1608 EXPORT_SYMBOL(acpi_check_region);
1611 * Let drivers know whether the resource checks are effective
1613 int acpi_resources_are_enforced(void)
1615 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1617 EXPORT_SYMBOL(acpi_resources_are_enforced);
1620 * Deallocate the memory for a spinlock.
1622 void acpi_os_delete_lock(acpi_spinlock handle)
1624 ACPI_FREE(handle);
1628 * Acquire a spinlock.
1630 * handle is a pointer to the spinlock_t.
1633 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1635 acpi_cpu_flags flags;
1636 spin_lock_irqsave(lockp, flags);
1637 return flags;
1641 * Release a spinlock. See above.
1644 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1646 spin_unlock_irqrestore(lockp, flags);
1649 #ifndef ACPI_USE_LOCAL_CACHE
1651 /*******************************************************************************
1653 * FUNCTION: acpi_os_create_cache
1655 * PARAMETERS: name - Ascii name for the cache
1656 * size - Size of each cached object
1657 * depth - Maximum depth of the cache (in objects) <ignored>
1658 * cache - Where the new cache object is returned
1660 * RETURN: status
1662 * DESCRIPTION: Create a cache object
1664 ******************************************************************************/
1666 acpi_status
1667 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1669 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1670 if (*cache == NULL)
1671 return AE_ERROR;
1672 else
1673 return AE_OK;
1676 /*******************************************************************************
1678 * FUNCTION: acpi_os_purge_cache
1680 * PARAMETERS: Cache - Handle to cache object
1682 * RETURN: Status
1684 * DESCRIPTION: Free all objects within the requested cache.
1686 ******************************************************************************/
1688 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1690 kmem_cache_shrink(cache);
1691 return (AE_OK);
1694 /*******************************************************************************
1696 * FUNCTION: acpi_os_delete_cache
1698 * PARAMETERS: Cache - Handle to cache object
1700 * RETURN: Status
1702 * DESCRIPTION: Free all objects within the requested cache and delete the
1703 * cache object.
1705 ******************************************************************************/
1707 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1709 kmem_cache_destroy(cache);
1710 return (AE_OK);
1713 /*******************************************************************************
1715 * FUNCTION: acpi_os_release_object
1717 * PARAMETERS: Cache - Handle to cache object
1718 * Object - The object to be released
1720 * RETURN: None
1722 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1723 * the object is deleted.
1725 ******************************************************************************/
1727 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1729 kmem_cache_free(cache, object);
1730 return (AE_OK);
1732 #endif
1734 static int __init acpi_no_auto_ssdt_setup(char *s)
1736 printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n");
1738 acpi_gbl_disable_ssdt_table_load = TRUE;
1740 return 1;
1743 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
1745 acpi_status __init acpi_os_initialize(void)
1747 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1748 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1749 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1750 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1752 return AE_OK;
1755 acpi_status __init acpi_os_initialize1(void)
1757 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1758 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1759 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1760 BUG_ON(!kacpid_wq);
1761 BUG_ON(!kacpi_notify_wq);
1762 BUG_ON(!kacpi_hotplug_wq);
1763 acpi_install_interface_handler(acpi_osi_handler);
1764 acpi_osi_setup_late();
1765 return AE_OK;
1768 acpi_status acpi_os_terminate(void)
1770 if (acpi_irq_handler) {
1771 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1772 acpi_irq_handler);
1775 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1776 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1777 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1778 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1780 destroy_workqueue(kacpid_wq);
1781 destroy_workqueue(kacpi_notify_wq);
1782 destroy_workqueue(kacpi_hotplug_wq);
1784 return AE_OK;
1787 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1788 u32 pm1b_control)
1790 int rc = 0;
1791 if (__acpi_os_prepare_sleep)
1792 rc = __acpi_os_prepare_sleep(sleep_state,
1793 pm1a_control, pm1b_control);
1794 if (rc < 0)
1795 return AE_ERROR;
1796 else if (rc > 0)
1797 return AE_CTRL_SKIP;
1799 return AE_OK;
1802 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1803 u32 pm1a_ctrl, u32 pm1b_ctrl))
1805 __acpi_os_prepare_sleep = func;
1808 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1809 u32 val_b)
1811 int rc = 0;
1812 if (__acpi_os_prepare_extended_sleep)
1813 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1814 val_a, val_b);
1815 if (rc < 0)
1816 return AE_ERROR;
1817 else if (rc > 0)
1818 return AE_CTRL_SKIP;
1820 return AE_OK;
1823 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1824 u32 val_a, u32 val_b))
1826 __acpi_os_prepare_extended_sleep = func;
1830 void alloc_acpi_hp_work(acpi_handle handle, u32 type, void *context,
1831 void (*func)(struct work_struct *work))
1833 struct acpi_hp_work *hp_work;
1834 int ret;
1836 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1837 if (!hp_work)
1838 return;
1840 hp_work->handle = handle;
1841 hp_work->type = type;
1842 hp_work->context = context;
1844 INIT_WORK(&hp_work->work, func);
1845 ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1846 if (!ret)
1847 kfree(hp_work);
1849 EXPORT_SYMBOL_GPL(alloc_acpi_hp_work);