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>
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>
50 #include <asm/uaccess.h>
52 #include <acpi/acpi.h>
53 #include <acpi/acpi_bus.h>
54 #include <acpi/processor.h>
56 #define _COMPONENT ACPI_OS_SERVICES
57 ACPI_MODULE_NAME("osl");
58 #define PREFIX "ACPI: "
60 acpi_osd_exec_callback function;
62 struct work_struct work;
66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
70 #ifdef ENABLE_DEBUGGER
71 #include <linux/kdb.h>
73 /* stuff for debugger support */
75 EXPORT_SYMBOL(acpi_in_debugger);
77 extern char line_buf[80];
78 #endif /*ENABLE_DEBUGGER */
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 struct workqueue_struct *kacpi_hotplug_wq;
85 EXPORT_SYMBOL(kacpi_hotplug_wq);
88 * This list of permanent mappings is for memory that may be accessed from
89 * interrupt context, where we can't do the ioremap().
92 struct list_head list;
94 acpi_physical_address phys;
96 unsigned long refcount;
99 static LIST_HEAD(acpi_ioremaps);
100 static DEFINE_MUTEX(acpi_ioremap_lock);
102 static void __init acpi_osi_setup_late(void);
105 * The story of _OSI(Linux)
107 * From pre-history through Linux-2.6.22,
108 * Linux responded TRUE upon a BIOS OSI(Linux) query.
110 * Unfortunately, reference BIOS writers got wind of this
111 * and put OSI(Linux) in their example code, quickly exposing
112 * this string as ill-conceived and opening the door to
113 * an un-bounded number of BIOS incompatibilities.
115 * For example, OSI(Linux) was used on resume to re-POST a
116 * video card on one system, because Linux at that time
117 * could not do a speedy restore in its native driver.
118 * But then upon gaining quick native restore capability,
119 * Linux has no way to tell the BIOS to skip the time-consuming
120 * POST -- putting Linux at a permanent performance disadvantage.
121 * On another system, the BIOS writer used OSI(Linux)
122 * to infer native OS support for IPMI! On other systems,
123 * OSI(Linux) simply got in the way of Linux claiming to
124 * be compatible with other operating systems, exposing
125 * BIOS issues such as skipped device initialization.
127 * So "Linux" turned out to be a really poor chose of
128 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
130 * BIOS writers should NOT query _OSI(Linux) on future systems.
131 * Linux will complain on the console when it sees it, and return FALSE.
132 * To get Linux to return TRUE for your system will require
133 * a kernel source update to add a DMI entry,
134 * or boot with "acpi_osi=Linux"
137 static struct osi_linux {
138 unsigned int enable:1;
140 unsigned int cmdline:1;
141 } osi_linux = {0, 0, 0};
143 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
145 if (!strcmp("Linux", interface)) {
147 printk_once(KERN_NOTICE FW_BUG PREFIX
148 "BIOS _OSI(Linux) query %s%s\n",
149 osi_linux.enable ? "honored" : "ignored",
150 osi_linux.cmdline ? " via cmdline" :
151 osi_linux.dmi ? " via DMI" : "");
157 static void __init acpi_request_region (struct acpi_generic_address *gas,
158 unsigned int length, char *desc)
162 /* Handle possible alignment issues */
163 memcpy(&addr, &gas->address, sizeof(addr));
164 if (!addr || !length)
167 /* Resources are never freed */
168 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
169 request_region(addr, length, desc);
170 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
171 request_mem_region(addr, length, desc);
174 static int __init acpi_reserve_resources(void)
176 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
177 "ACPI PM1a_EVT_BLK");
179 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
180 "ACPI PM1b_EVT_BLK");
182 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
183 "ACPI PM1a_CNT_BLK");
185 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
186 "ACPI PM1b_CNT_BLK");
188 if (acpi_gbl_FADT.pm_timer_length == 4)
189 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
191 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
194 /* Length of GPE blocks must be a non-negative multiple of 2 */
196 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
197 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
198 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
200 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
201 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
202 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
206 device_initcall(acpi_reserve_resources);
208 void acpi_os_printf(const char *fmt, ...)
212 acpi_os_vprintf(fmt, args);
216 void acpi_os_vprintf(const char *fmt, va_list args)
218 static char buffer[512];
220 vsprintf(buffer, fmt, args);
222 #ifdef ENABLE_DEBUGGER
223 if (acpi_in_debugger) {
224 kdb_printf("%s", buffer);
226 printk(KERN_CONT "%s", buffer);
229 printk(KERN_CONT "%s", buffer);
234 static unsigned long acpi_rsdp;
235 static int __init setup_acpi_rsdp(char *arg)
237 acpi_rsdp = simple_strtoul(arg, NULL, 16);
240 early_param("acpi_rsdp", setup_acpi_rsdp);
243 acpi_physical_address __init acpi_os_get_root_pointer(void)
251 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
253 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
256 printk(KERN_ERR PREFIX
257 "System description tables not found\n");
261 acpi_physical_address pa = 0;
263 acpi_find_root_pointer(&pa);
268 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
269 static struct acpi_ioremap *
270 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
272 struct acpi_ioremap *map;
274 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
275 if (map->phys <= phys &&
276 phys + size <= map->phys + map->size)
282 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
283 static void __iomem *
284 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
286 struct acpi_ioremap *map;
288 map = acpi_map_lookup(phys, size);
290 return map->virt + (phys - map->phys);
295 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
297 struct acpi_ioremap *map;
298 void __iomem *virt = NULL;
300 mutex_lock(&acpi_ioremap_lock);
301 map = acpi_map_lookup(phys, size);
303 virt = map->virt + (phys - map->phys);
306 mutex_unlock(&acpi_ioremap_lock);
309 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
311 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
312 static struct acpi_ioremap *
313 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
315 struct acpi_ioremap *map;
317 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
318 if (map->virt <= virt &&
319 virt + size <= map->virt + map->size)
326 #define should_use_kmap(pfn) page_is_ram(pfn)
328 /* ioremap will take care of cache attributes */
329 #define should_use_kmap(pfn) 0
332 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
336 pfn = pg_off >> PAGE_SHIFT;
337 if (should_use_kmap(pfn)) {
338 if (pg_sz > PAGE_SIZE)
340 return (void __iomem __force *)kmap(pfn_to_page(pfn));
342 return acpi_os_ioremap(pg_off, pg_sz);
345 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
349 pfn = pg_off >> PAGE_SHIFT;
350 if (should_use_kmap(pfn))
351 kunmap(pfn_to_page(pfn));
356 void __iomem *__init_refok
357 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
359 struct acpi_ioremap *map;
361 acpi_physical_address pg_off;
364 if (phys > ULONG_MAX) {
365 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
369 if (!acpi_gbl_permanent_mmap)
370 return __acpi_map_table((unsigned long)phys, size);
372 mutex_lock(&acpi_ioremap_lock);
373 /* Check if there's a suitable mapping already. */
374 map = acpi_map_lookup(phys, size);
380 map = kzalloc(sizeof(*map), GFP_KERNEL);
382 mutex_unlock(&acpi_ioremap_lock);
386 pg_off = round_down(phys, PAGE_SIZE);
387 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
388 virt = acpi_map(pg_off, pg_sz);
390 mutex_unlock(&acpi_ioremap_lock);
395 INIT_LIST_HEAD(&map->list);
401 list_add_tail_rcu(&map->list, &acpi_ioremaps);
404 mutex_unlock(&acpi_ioremap_lock);
405 return map->virt + (phys - map->phys);
407 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
409 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
411 if (!--map->refcount)
412 list_del_rcu(&map->list);
415 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
417 if (!map->refcount) {
419 acpi_unmap(map->phys, map->virt);
424 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
426 struct acpi_ioremap *map;
428 if (!acpi_gbl_permanent_mmap) {
429 __acpi_unmap_table(virt, size);
433 mutex_lock(&acpi_ioremap_lock);
434 map = acpi_map_lookup_virt(virt, size);
436 mutex_unlock(&acpi_ioremap_lock);
437 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
440 acpi_os_drop_map_ref(map);
441 mutex_unlock(&acpi_ioremap_lock);
443 acpi_os_map_cleanup(map);
445 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
447 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
449 if (!acpi_gbl_permanent_mmap)
450 __acpi_unmap_table(virt, size);
453 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
458 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
461 /* Handle possible alignment issues */
462 memcpy(&addr, &gas->address, sizeof(addr));
463 if (!addr || !gas->bit_width)
466 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
472 EXPORT_SYMBOL(acpi_os_map_generic_address);
474 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
477 struct acpi_ioremap *map;
479 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
482 /* Handle possible alignment issues */
483 memcpy(&addr, &gas->address, sizeof(addr));
484 if (!addr || !gas->bit_width)
487 mutex_lock(&acpi_ioremap_lock);
488 map = acpi_map_lookup(addr, gas->bit_width / 8);
490 mutex_unlock(&acpi_ioremap_lock);
493 acpi_os_drop_map_ref(map);
494 mutex_unlock(&acpi_ioremap_lock);
496 acpi_os_map_cleanup(map);
498 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
500 #ifdef ACPI_FUTURE_USAGE
502 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
505 return AE_BAD_PARAMETER;
507 *phys = virt_to_phys(virt);
513 #define ACPI_MAX_OVERRIDE_LEN 100
515 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
518 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
519 acpi_string * new_val)
521 if (!init_val || !new_val)
522 return AE_BAD_PARAMETER;
525 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
526 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
528 *new_val = acpi_os_name;
535 acpi_os_table_override(struct acpi_table_header * existing_table,
536 struct acpi_table_header ** new_table)
538 if (!existing_table || !new_table)
539 return AE_BAD_PARAMETER;
543 #ifdef CONFIG_ACPI_CUSTOM_DSDT
544 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
545 *new_table = (struct acpi_table_header *)AmlCode;
547 if (*new_table != NULL) {
548 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
549 "this is unsafe: tainting kernel\n",
550 existing_table->signature,
551 existing_table->oem_table_id);
552 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
558 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
559 acpi_physical_address * new_address,
560 u32 *new_table_length)
566 static irqreturn_t acpi_irq(int irq, void *dev_id)
570 handled = (*acpi_irq_handler) (acpi_irq_context);
576 acpi_irq_not_handled++;
582 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
587 acpi_irq_stats_init();
590 * ACPI interrupts different from the SCI in our copy of the FADT are
593 if (gsi != acpi_gbl_FADT.sci_interrupt)
594 return AE_BAD_PARAMETER;
596 if (acpi_irq_handler)
597 return AE_ALREADY_ACQUIRED;
599 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
600 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
605 acpi_irq_handler = handler;
606 acpi_irq_context = context;
607 if (request_threaded_irq(irq, NULL, acpi_irq, IRQF_SHARED, "acpi",
609 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
610 acpi_irq_handler = NULL;
611 return AE_NOT_ACQUIRED;
617 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
619 if (irq != acpi_gbl_FADT.sci_interrupt)
620 return AE_BAD_PARAMETER;
622 free_irq(irq, acpi_irq);
623 acpi_irq_handler = NULL;
629 * Running in interpreter thread context, safe to sleep
632 void acpi_os_sleep(u64 ms)
634 schedule_timeout_interruptible(msecs_to_jiffies(ms));
637 void acpi_os_stall(u32 us)
645 touch_nmi_watchdog();
651 * Support ACPI 3.0 AML Timer operand
652 * Returns 64-bit free-running, monotonically increasing timer
653 * with 100ns granularity
655 u64 acpi_os_get_timer(void)
660 /* TBD: use HPET if available */
663 #ifdef CONFIG_X86_PM_TIMER
664 /* TBD: default to PM timer if HPET was not available */
667 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
672 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
681 *(u8 *) value = inb(port);
682 } else if (width <= 16) {
683 *(u16 *) value = inw(port);
684 } else if (width <= 32) {
685 *(u32 *) value = inl(port);
693 EXPORT_SYMBOL(acpi_os_read_port);
695 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
699 } else if (width <= 16) {
701 } else if (width <= 32) {
710 EXPORT_SYMBOL(acpi_os_write_port);
713 static inline u64 read64(const volatile void __iomem *addr)
718 static inline u64 read64(const volatile void __iomem *addr)
723 return l | (h << 32);
728 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
730 void __iomem *virt_addr;
731 unsigned int size = width / 8;
736 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
739 virt_addr = acpi_os_ioremap(phys_addr, size);
741 return AE_BAD_ADDRESS;
750 *(u8 *) value = readb(virt_addr);
753 *(u16 *) value = readw(virt_addr);
756 *(u32 *) value = readl(virt_addr);
759 *(u64 *) value = read64(virt_addr);
774 static inline void write64(u64 val, volatile void __iomem *addr)
779 static inline void write64(u64 val, volatile void __iomem *addr)
782 writel(val>>32, addr+4);
787 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
789 void __iomem *virt_addr;
790 unsigned int size = width / 8;
794 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
797 virt_addr = acpi_os_ioremap(phys_addr, size);
799 return AE_BAD_ADDRESS;
805 writeb(value, virt_addr);
808 writew(value, virt_addr);
811 writel(value, virt_addr);
814 write64(value, virt_addr);
829 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
830 u64 *value, u32 width)
836 return AE_BAD_PARAMETER;
852 result = raw_pci_read(pci_id->segment, pci_id->bus,
853 PCI_DEVFN(pci_id->device, pci_id->function),
854 reg, size, &value32);
857 return (result ? AE_ERROR : AE_OK);
861 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
862 u64 value, u32 width)
880 result = raw_pci_write(pci_id->segment, pci_id->bus,
881 PCI_DEVFN(pci_id->device, pci_id->function),
884 return (result ? AE_ERROR : AE_OK);
887 static void acpi_os_execute_deferred(struct work_struct *work)
889 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
892 acpi_os_wait_events_complete(NULL);
894 dpc->function(dpc->context);
898 /*******************************************************************************
900 * FUNCTION: acpi_os_execute
902 * PARAMETERS: Type - Type of the callback
903 * Function - Function to be executed
904 * Context - Function parameters
908 * DESCRIPTION: Depending on type, either queues function for deferred execution or
909 * immediately executes function on a separate thread.
911 ******************************************************************************/
913 static acpi_status __acpi_os_execute(acpi_execute_type type,
914 acpi_osd_exec_callback function, void *context, int hp)
916 acpi_status status = AE_OK;
917 struct acpi_os_dpc *dpc;
918 struct workqueue_struct *queue;
920 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
921 "Scheduling function [%p(%p)] for deferred execution.\n",
925 * Allocate/initialize DPC structure. Note that this memory will be
926 * freed by the callee. The kernel handles the work_struct list in a
927 * way that allows us to also free its memory inside the callee.
928 * Because we may want to schedule several tasks with different
929 * parameters we can't use the approach some kernel code uses of
930 * having a static work_struct.
933 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
937 dpc->function = function;
938 dpc->context = context;
941 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
942 * because the hotplug code may call driver .remove() functions,
943 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
944 * to flush these workqueues.
946 queue = hp ? kacpi_hotplug_wq :
947 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
948 dpc->wait = hp ? 1 : 0;
950 if (queue == kacpi_hotplug_wq)
951 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
952 else if (queue == kacpi_notify_wq)
953 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
955 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
958 * On some machines, a software-initiated SMI causes corruption unless
959 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
960 * typically it's done in GPE-related methods that are run via
961 * workqueues, so we can avoid the known corruption cases by always
964 ret = queue_work_on(0, queue, &dpc->work);
967 printk(KERN_ERR PREFIX
968 "Call to queue_work() failed.\n");
975 acpi_status acpi_os_execute(acpi_execute_type type,
976 acpi_osd_exec_callback function, void *context)
978 return __acpi_os_execute(type, function, context, 0);
980 EXPORT_SYMBOL(acpi_os_execute);
982 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
985 return __acpi_os_execute(0, function, context, 1);
988 void acpi_os_wait_events_complete(void *context)
990 flush_workqueue(kacpid_wq);
991 flush_workqueue(kacpi_notify_wq);
994 EXPORT_SYMBOL(acpi_os_wait_events_complete);
997 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
999 struct semaphore *sem = NULL;
1001 sem = acpi_os_allocate(sizeof(struct semaphore));
1003 return AE_NO_MEMORY;
1004 memset(sem, 0, sizeof(struct semaphore));
1006 sema_init(sem, initial_units);
1008 *handle = (acpi_handle *) sem;
1010 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1011 *handle, initial_units));
1017 * TODO: A better way to delete semaphores? Linux doesn't have a
1018 * 'delete_semaphore()' function -- may result in an invalid
1019 * pointer dereference for non-synchronized consumers. Should
1020 * we at least check for blocked threads and signal/cancel them?
1023 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1025 struct semaphore *sem = (struct semaphore *)handle;
1028 return AE_BAD_PARAMETER;
1030 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1032 BUG_ON(!list_empty(&sem->wait_list));
1040 * TODO: Support for units > 1?
1042 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1044 acpi_status status = AE_OK;
1045 struct semaphore *sem = (struct semaphore *)handle;
1049 if (!sem || (units < 1))
1050 return AE_BAD_PARAMETER;
1055 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1056 handle, units, timeout));
1058 if (timeout == ACPI_WAIT_FOREVER)
1059 jiffies = MAX_SCHEDULE_TIMEOUT;
1061 jiffies = msecs_to_jiffies(timeout);
1063 ret = down_timeout(sem, jiffies);
1067 if (ACPI_FAILURE(status)) {
1068 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1069 "Failed to acquire semaphore[%p|%d|%d], %s",
1070 handle, units, timeout,
1071 acpi_format_exception(status)));
1073 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1074 "Acquired semaphore[%p|%d|%d]", handle,
1082 * TODO: Support for units > 1?
1084 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1086 struct semaphore *sem = (struct semaphore *)handle;
1088 if (!sem || (units < 1))
1089 return AE_BAD_PARAMETER;
1094 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1102 #ifdef ACPI_FUTURE_USAGE
1103 u32 acpi_os_get_line(char *buffer)
1106 #ifdef ENABLE_DEBUGGER
1107 if (acpi_in_debugger) {
1110 kdb_read(buffer, sizeof(line_buf));
1112 /* remove the CR kdb includes */
1113 chars = strlen(buffer) - 1;
1114 buffer[chars] = '\0';
1120 #endif /* ACPI_FUTURE_USAGE */
1122 acpi_status acpi_os_signal(u32 function, void *info)
1125 case ACPI_SIGNAL_FATAL:
1126 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1128 case ACPI_SIGNAL_BREAKPOINT:
1131 * ACPI spec. says to treat it as a NOP unless
1132 * you are debugging. So if/when we integrate
1133 * AML debugger into the kernel debugger its
1134 * hook will go here. But until then it is
1135 * not useful to print anything on breakpoints.
1145 static int __init acpi_os_name_setup(char *str)
1147 char *p = acpi_os_name;
1148 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1153 for (; count-- && str && *str; str++) {
1154 if (isalnum(*str) || *str == ' ' || *str == ':')
1156 else if (*str == '\'' || *str == '"')
1167 __setup("acpi_os_name=", acpi_os_name_setup);
1169 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1170 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1172 struct osi_setup_entry {
1173 char string[OSI_STRING_LENGTH_MAX];
1177 static struct osi_setup_entry __initdata
1178 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1179 {"Module Device", true},
1180 {"Processor Device", true},
1181 {"3.0 _SCP Extensions", true},
1182 {"Processor Aggregator Device", true},
1185 void __init acpi_osi_setup(char *str)
1187 struct osi_setup_entry *osi;
1191 if (!acpi_gbl_create_osi_method)
1194 if (str == NULL || *str == '\0') {
1195 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1196 acpi_gbl_create_osi_method = FALSE;
1205 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1206 osi = &osi_setup_entries[i];
1207 if (!strcmp(osi->string, str)) {
1208 osi->enable = enable;
1210 } else if (osi->string[0] == '\0') {
1211 osi->enable = enable;
1212 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1218 static void __init set_osi_linux(unsigned int enable)
1220 if (osi_linux.enable != enable)
1221 osi_linux.enable = enable;
1223 if (osi_linux.enable)
1224 acpi_osi_setup("Linux");
1226 acpi_osi_setup("!Linux");
1231 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1233 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1235 set_osi_linux(enable);
1240 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1242 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1247 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1248 set_osi_linux(enable);
1254 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1256 * empty string disables _OSI
1257 * string starting with '!' disables that string
1258 * otherwise string is added to list, augmenting built-in strings
1260 static void __init acpi_osi_setup_late(void)
1262 struct osi_setup_entry *osi;
1267 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1268 osi = &osi_setup_entries[i];
1274 status = acpi_install_interface(str);
1276 if (ACPI_SUCCESS(status))
1277 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1279 status = acpi_remove_interface(str);
1281 if (ACPI_SUCCESS(status))
1282 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1287 static int __init osi_setup(char *str)
1289 if (str && !strcmp("Linux", str))
1290 acpi_cmdline_osi_linux(1);
1291 else if (str && !strcmp("!Linux", str))
1292 acpi_cmdline_osi_linux(0);
1294 acpi_osi_setup(str);
1299 __setup("acpi_osi=", osi_setup);
1301 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1302 static int __init acpi_serialize_setup(char *str)
1304 printk(KERN_INFO PREFIX "serialize enabled\n");
1306 acpi_gbl_all_methods_serialized = TRUE;
1311 __setup("acpi_serialize", acpi_serialize_setup);
1313 /* Check of resource interference between native drivers and ACPI
1314 * OperationRegions (SystemIO and System Memory only).
1315 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1316 * in arbitrary AML code and can interfere with legacy drivers.
1317 * acpi_enforce_resources= can be set to:
1319 * - strict (default) (2)
1320 * -> further driver trying to access the resources will not load
1322 * -> further driver trying to access the resources will load, but you
1323 * get a system message that something might go wrong...
1326 * -> ACPI Operation Region resources will not be registered
1329 #define ENFORCE_RESOURCES_STRICT 2
1330 #define ENFORCE_RESOURCES_LAX 1
1331 #define ENFORCE_RESOURCES_NO 0
1333 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1335 static int __init acpi_enforce_resources_setup(char *str)
1337 if (str == NULL || *str == '\0')
1340 if (!strcmp("strict", str))
1341 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1342 else if (!strcmp("lax", str))
1343 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1344 else if (!strcmp("no", str))
1345 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1350 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1352 /* Check for resource conflicts between ACPI OperationRegions and native
1354 int acpi_check_resource_conflict(const struct resource *res)
1356 acpi_adr_space_type space_id;
1361 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1363 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1366 if (res->flags & IORESOURCE_IO)
1367 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1369 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1371 length = res->end - res->start + 1;
1372 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1374 clash = acpi_check_address_range(space_id, res->start, length, warn);
1377 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1378 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1379 printk(KERN_NOTICE "ACPI: This conflict may"
1380 " cause random problems and system"
1382 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1383 " for this device, you should use it instead of"
1384 " the native driver\n");
1386 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1391 EXPORT_SYMBOL(acpi_check_resource_conflict);
1393 int acpi_check_region(resource_size_t start, resource_size_t n,
1396 struct resource res = {
1398 .end = start + n - 1,
1400 .flags = IORESOURCE_IO,
1403 return acpi_check_resource_conflict(&res);
1405 EXPORT_SYMBOL(acpi_check_region);
1408 * Let drivers know whether the resource checks are effective
1410 int acpi_resources_are_enforced(void)
1412 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1414 EXPORT_SYMBOL(acpi_resources_are_enforced);
1417 * Deallocate the memory for a spinlock.
1419 void acpi_os_delete_lock(acpi_spinlock handle)
1425 * Acquire a spinlock.
1427 * handle is a pointer to the spinlock_t.
1430 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1432 acpi_cpu_flags flags;
1433 spin_lock_irqsave(lockp, flags);
1438 * Release a spinlock. See above.
1441 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1443 spin_unlock_irqrestore(lockp, flags);
1446 #ifndef ACPI_USE_LOCAL_CACHE
1448 /*******************************************************************************
1450 * FUNCTION: acpi_os_create_cache
1452 * PARAMETERS: name - Ascii name for the cache
1453 * size - Size of each cached object
1454 * depth - Maximum depth of the cache (in objects) <ignored>
1455 * cache - Where the new cache object is returned
1459 * DESCRIPTION: Create a cache object
1461 ******************************************************************************/
1464 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1466 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1473 /*******************************************************************************
1475 * FUNCTION: acpi_os_purge_cache
1477 * PARAMETERS: Cache - Handle to cache object
1481 * DESCRIPTION: Free all objects within the requested cache.
1483 ******************************************************************************/
1485 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1487 kmem_cache_shrink(cache);
1491 /*******************************************************************************
1493 * FUNCTION: acpi_os_delete_cache
1495 * PARAMETERS: Cache - Handle to cache object
1499 * DESCRIPTION: Free all objects within the requested cache and delete the
1502 ******************************************************************************/
1504 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1506 kmem_cache_destroy(cache);
1510 /*******************************************************************************
1512 * FUNCTION: acpi_os_release_object
1514 * PARAMETERS: Cache - Handle to cache object
1515 * Object - The object to be released
1519 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1520 * the object is deleted.
1522 ******************************************************************************/
1524 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1526 kmem_cache_free(cache, object);
1531 acpi_status __init acpi_os_initialize(void)
1533 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1534 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1535 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1536 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1541 acpi_status __init acpi_os_initialize1(void)
1543 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1544 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1545 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1547 BUG_ON(!kacpi_notify_wq);
1548 BUG_ON(!kacpi_hotplug_wq);
1549 acpi_install_interface_handler(acpi_osi_handler);
1550 acpi_osi_setup_late();
1554 acpi_status acpi_os_terminate(void)
1556 if (acpi_irq_handler) {
1557 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1561 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1562 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1563 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1564 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1566 destroy_workqueue(kacpid_wq);
1567 destroy_workqueue(kacpi_notify_wq);
1568 destroy_workqueue(kacpi_hotplug_wq);