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>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 #include <linux/module.h>
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
32 #include <linux/pci.h>
33 #include <linux/interrupt.h>
34 #include <linux/kmod.h>
35 #include <linux/delay.h>
36 #include <linux/dmi.h>
37 #include <linux/workqueue.h>
38 #include <linux/nmi.h>
39 #include <linux/acpi.h>
40 #include <acpi/acpi.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/processor.h>
44 #include <asm/uaccess.h>
46 #include <linux/efi.h>
47 #include <linux/ioport.h>
48 #include <linux/list.h>
50 #define _COMPONENT ACPI_OS_SERVICES
51 ACPI_MODULE_NAME("osl");
52 #define PREFIX "ACPI: "
54 acpi_osd_exec_callback function;
56 struct work_struct work;
59 #ifdef CONFIG_ACPI_CUSTOM_DSDT
60 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
63 #ifdef ENABLE_DEBUGGER
64 #include <linux/kdb.h>
66 /* stuff for debugger support */
68 EXPORT_SYMBOL(acpi_in_debugger);
70 extern char line_buf[80];
71 #endif /*ENABLE_DEBUGGER */
73 static unsigned int acpi_irq_irq;
74 static acpi_osd_handler acpi_irq_handler;
75 static void *acpi_irq_context;
76 static struct workqueue_struct *kacpid_wq;
77 static struct workqueue_struct *kacpi_notify_wq;
79 struct acpi_res_list {
80 resource_size_t start;
82 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
83 char name[5]; /* only can have a length of 4 chars, make use of this
84 one instead of res->name, no need to kalloc then */
85 struct list_head resource_list;
88 static LIST_HEAD(resource_list_head);
89 static DEFINE_SPINLOCK(acpi_res_lock);
91 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
92 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
95 * "Ode to _OSI(Linux)"
97 * osi_linux -- Control response to BIOS _OSI(Linux) query.
99 * As Linux evolves, the features that it supports change.
100 * So an OSI string such as "Linux" is not specific enough
101 * to be useful across multiple versions of Linux. It
102 * doesn't identify any particular feature, interface,
103 * or even any particular version of Linux...
105 * Unfortunately, Linux-2.6.22 and earlier responded "yes"
106 * to a BIOS _OSI(Linux) query. When
107 * a reference mobile BIOS started using it, its use
108 * started to spread to many vendor platforms.
109 * As it is not supportable, we need to halt that spread.
111 * Today, most BIOS references to _OSI(Linux) are noise --
112 * they have no functional effect and are just dead code
113 * carried over from the reference BIOS.
115 * The next most common case is that _OSI(Linux) harms Linux,
116 * usually by causing the BIOS to follow paths that are
117 * not tested during Windows validation.
119 * Finally, there is a short list of platforms
120 * where OSI(Linux) benefits Linux.
122 * In Linux-2.6.23, OSI(Linux) is first disabled by default.
123 * DMI is used to disable the dmesg warning about OSI(Linux)
124 * on platforms where it is known to have no effect.
125 * But a dmesg warning remains for systems where
126 * we do not know if OSI(Linux) is good or bad for the system.
127 * DMI is also used to enable OSI(Linux) for the machines
128 * that are known to need it.
130 * BIOS writers should NOT query _OSI(Linux) on future systems.
131 * It will be ignored by default, and to get Linux to
132 * not ignore it will require a kernel source update to
133 * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
135 #define OSI_LINUX_ENABLE 0
137 static struct osi_linux {
138 unsigned int enable:1;
140 unsigned int cmdline:1;
141 unsigned int known:1;
142 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
144 static void __init acpi_request_region (struct acpi_generic_address *addr,
145 unsigned int length, char *desc)
147 struct resource *res;
149 if (!addr->address || !length)
152 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
153 res = request_region(addr->address, length, desc);
154 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
155 res = request_mem_region(addr->address, length, desc);
158 static int __init acpi_reserve_resources(void)
160 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
161 "ACPI PM1a_EVT_BLK");
163 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
164 "ACPI PM1b_EVT_BLK");
166 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
167 "ACPI PM1a_CNT_BLK");
169 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
170 "ACPI PM1b_CNT_BLK");
172 if (acpi_gbl_FADT.pm_timer_length == 4)
173 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
175 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
178 /* Length of GPE blocks must be a non-negative multiple of 2 */
180 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
181 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
182 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
184 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
185 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
186 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
190 device_initcall(acpi_reserve_resources);
192 acpi_status __init acpi_os_initialize(void)
197 acpi_status acpi_os_initialize1(void)
200 * Initialize PCI configuration space access, as we'll need to access
201 * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
204 printk(KERN_ERR PREFIX
205 "Access to PCI configuration space unavailable\n");
206 return AE_NULL_ENTRY;
208 kacpid_wq = create_singlethread_workqueue("kacpid");
209 kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
211 BUG_ON(!kacpi_notify_wq);
215 acpi_status acpi_os_terminate(void)
217 if (acpi_irq_handler) {
218 acpi_os_remove_interrupt_handler(acpi_irq_irq,
222 destroy_workqueue(kacpid_wq);
223 destroy_workqueue(kacpi_notify_wq);
228 void acpi_os_printf(const char *fmt, ...)
232 acpi_os_vprintf(fmt, args);
236 void acpi_os_vprintf(const char *fmt, va_list args)
238 static char buffer[512];
240 vsprintf(buffer, fmt, args);
242 #ifdef ENABLE_DEBUGGER
243 if (acpi_in_debugger) {
244 kdb_printf("%s", buffer);
246 printk("%s", buffer);
249 printk("%s", buffer);
253 acpi_physical_address __init acpi_os_get_root_pointer(void)
256 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
258 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
261 printk(KERN_ERR PREFIX
262 "System description tables not found\n");
266 acpi_physical_address pa = 0;
268 acpi_find_root_pointer(&pa);
273 void __iomem *__init_refok
274 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
276 if (phys > ULONG_MAX) {
277 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
280 if (acpi_gbl_permanent_mmap)
282 * ioremap checks to ensure this is in reserved space
284 return ioremap((unsigned long)phys, size);
286 return __acpi_map_table((unsigned long)phys, size);
288 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
290 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
292 if (acpi_gbl_permanent_mmap) {
296 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
298 #ifdef ACPI_FUTURE_USAGE
300 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
303 return AE_BAD_PARAMETER;
305 *phys = virt_to_phys(virt);
311 #define ACPI_MAX_OVERRIDE_LEN 100
313 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
316 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
317 acpi_string * new_val)
319 if (!init_val || !new_val)
320 return AE_BAD_PARAMETER;
323 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
324 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
326 *new_val = acpi_os_name;
333 acpi_os_table_override(struct acpi_table_header * existing_table,
334 struct acpi_table_header ** new_table)
336 if (!existing_table || !new_table)
337 return AE_BAD_PARAMETER;
339 #ifdef CONFIG_ACPI_CUSTOM_DSDT
340 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
341 *new_table = (struct acpi_table_header *)AmlCode;
350 static irqreturn_t acpi_irq(int irq, void *dev_id)
354 handled = (*acpi_irq_handler) (acpi_irq_context);
364 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
369 acpi_irq_stats_init();
372 * Ignore the GSI from the core, and use the value in our copy of the
373 * FADT. It may not be the same if an interrupt source override exists
376 gsi = acpi_gbl_FADT.sci_interrupt;
377 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
378 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
383 acpi_irq_handler = handler;
384 acpi_irq_context = context;
385 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
386 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
387 return AE_NOT_ACQUIRED;
394 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
397 free_irq(irq, acpi_irq);
398 acpi_irq_handler = NULL;
406 * Running in interpreter thread context, safe to sleep
409 void acpi_os_sleep(acpi_integer ms)
411 schedule_timeout_interruptible(msecs_to_jiffies(ms));
414 void acpi_os_stall(u32 us)
422 touch_nmi_watchdog();
428 * Support ACPI 3.0 AML Timer operand
429 * Returns 64-bit free-running, monotonically increasing timer
430 * with 100ns granularity
432 u64 acpi_os_get_timer(void)
437 /* TBD: use HPET if available */
440 #ifdef CONFIG_X86_PM_TIMER
441 /* TBD: default to PM timer if HPET was not available */
444 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
449 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
458 *(u8 *) value = inb(port);
459 } else if (width <= 16) {
460 *(u16 *) value = inw(port);
461 } else if (width <= 32) {
462 *(u32 *) value = inl(port);
470 EXPORT_SYMBOL(acpi_os_read_port);
472 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
476 } else if (width <= 16) {
478 } else if (width <= 32) {
487 EXPORT_SYMBOL(acpi_os_write_port);
490 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
493 void __iomem *virt_addr;
495 virt_addr = ioremap(phys_addr, width);
501 *(u8 *) value = readb(virt_addr);
504 *(u16 *) value = readw(virt_addr);
507 *(u32 *) value = readl(virt_addr);
519 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
521 void __iomem *virt_addr;
523 virt_addr = ioremap(phys_addr, width);
527 writeb(value, virt_addr);
530 writew(value, virt_addr);
533 writel(value, virt_addr);
545 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
546 void *value, u32 width)
551 return AE_BAD_PARAMETER;
567 BUG_ON(!raw_pci_ops);
569 result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
570 PCI_DEVFN(pci_id->device, pci_id->function),
573 return (result ? AE_ERROR : AE_OK);
577 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
578 acpi_integer value, u32 width)
596 BUG_ON(!raw_pci_ops);
598 result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
599 PCI_DEVFN(pci_id->device, pci_id->function),
602 return (result ? AE_ERROR : AE_OK);
605 /* TODO: Change code to take advantage of driver model more */
606 static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */
607 acpi_handle chandle, /* current node */
608 struct acpi_pci_id **id,
609 int *is_bridge, u8 * bus_number)
612 struct acpi_pci_id *pci_id = *id;
615 acpi_object_type type;
618 acpi_get_parent(chandle, &handle);
619 if (handle != rhandle) {
620 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
623 status = acpi_get_type(handle, &type);
624 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
628 acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
630 if (ACPI_SUCCESS(status)) {
631 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
632 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
635 pci_id->bus = *bus_number;
637 /* any nicer way to get bus number of bridge ? */
639 acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
641 if (ACPI_SUCCESS(status)
642 && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
644 acpi_os_read_pci_configuration(pci_id, 0x18,
646 if (!ACPI_SUCCESS(status)) {
647 /* Certainly broken... FIX ME */
653 acpi_os_read_pci_configuration(pci_id, 0x19,
655 if (ACPI_SUCCESS(status)) {
664 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */
665 acpi_handle chandle, /* current node */
666 struct acpi_pci_id **id)
669 u8 bus_number = (*id)->bus;
671 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
674 static void acpi_os_execute_deferred(struct work_struct *work)
676 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
678 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
682 dpc->function(dpc->context);
688 /*******************************************************************************
690 * FUNCTION: acpi_os_execute
692 * PARAMETERS: Type - Type of the callback
693 * Function - Function to be executed
694 * Context - Function parameters
698 * DESCRIPTION: Depending on type, either queues function for deferred execution or
699 * immediately executes function on a separate thread.
701 ******************************************************************************/
703 acpi_status acpi_os_execute(acpi_execute_type type,
704 acpi_osd_exec_callback function, void *context)
706 acpi_status status = AE_OK;
707 struct acpi_os_dpc *dpc;
708 struct workqueue_struct *queue;
709 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
710 "Scheduling function [%p(%p)] for deferred execution.\n",
714 return AE_BAD_PARAMETER;
717 * Allocate/initialize DPC structure. Note that this memory will be
718 * freed by the callee. The kernel handles the work_struct list in a
719 * way that allows us to also free its memory inside the callee.
720 * Because we may want to schedule several tasks with different
721 * parameters we can't use the approach some kernel code uses of
722 * having a static work_struct.
725 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
727 return_ACPI_STATUS(AE_NO_MEMORY);
729 dpc->function = function;
730 dpc->context = context;
732 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
733 queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
734 if (!queue_work(queue, &dpc->work)) {
735 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
736 "Call to queue_work() failed.\n"));
740 return_ACPI_STATUS(status);
743 EXPORT_SYMBOL(acpi_os_execute);
745 void acpi_os_wait_events_complete(void *context)
747 flush_workqueue(kacpid_wq);
750 EXPORT_SYMBOL(acpi_os_wait_events_complete);
753 * Allocate the memory for a spinlock and initialize it.
755 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
757 spin_lock_init(*handle);
763 * Deallocate the memory for a spinlock.
765 void acpi_os_delete_lock(acpi_spinlock handle)
771 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
773 struct semaphore *sem = NULL;
776 sem = acpi_os_allocate(sizeof(struct semaphore));
779 memset(sem, 0, sizeof(struct semaphore));
781 sema_init(sem, initial_units);
783 *handle = (acpi_handle *) sem;
785 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
786 *handle, initial_units));
792 * TODO: A better way to delete semaphores? Linux doesn't have a
793 * 'delete_semaphore()' function -- may result in an invalid
794 * pointer dereference for non-synchronized consumers. Should
795 * we at least check for blocked threads and signal/cancel them?
798 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
800 struct semaphore *sem = (struct semaphore *)handle;
804 return AE_BAD_PARAMETER;
806 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
815 * TODO: The kernel doesn't have a 'down_timeout' function -- had to
816 * improvise. The process is to sleep for one scheduler quantum
817 * until the semaphore becomes available. Downside is that this
818 * may result in starvation for timeout-based waits when there's
819 * lots of semaphore activity.
821 * TODO: Support for units > 1?
823 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
825 acpi_status status = AE_OK;
826 struct semaphore *sem = (struct semaphore *)handle;
830 if (!sem || (units < 1))
831 return AE_BAD_PARAMETER;
836 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
837 handle, units, timeout));
840 * This can be called during resume with interrupts off.
841 * Like boot-time, we should be single threaded and will
842 * always get the lock if we try -- timeout or not.
843 * If this doesn't succeed, then we will oops courtesy of
844 * might_sleep() in down().
846 if (!down_trylock(sem))
853 * A zero timeout value indicates that we shouldn't wait - just
854 * acquire the semaphore if available otherwise return AE_TIME
855 * (a.k.a. 'would block').
858 if (down_trylock(sem))
866 case ACPI_WAIT_FOREVER:
875 // TODO: A better timeout algorithm?
878 static const int quantum_ms = 1000 / HZ;
880 ret = down_trylock(sem);
881 for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
882 schedule_timeout_interruptible(1);
883 ret = down_trylock(sem);
892 if (ACPI_FAILURE(status)) {
893 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
894 "Failed to acquire semaphore[%p|%d|%d], %s",
895 handle, units, timeout,
896 acpi_format_exception(status)));
898 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
899 "Acquired semaphore[%p|%d|%d]", handle,
907 * TODO: Support for units > 1?
909 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
911 struct semaphore *sem = (struct semaphore *)handle;
914 if (!sem || (units < 1))
915 return AE_BAD_PARAMETER;
920 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
928 #ifdef ACPI_FUTURE_USAGE
929 u32 acpi_os_get_line(char *buffer)
932 #ifdef ENABLE_DEBUGGER
933 if (acpi_in_debugger) {
936 kdb_read(buffer, sizeof(line_buf));
938 /* remove the CR kdb includes */
939 chars = strlen(buffer) - 1;
940 buffer[chars] = '\0';
946 #endif /* ACPI_FUTURE_USAGE */
948 acpi_status acpi_os_signal(u32 function, void *info)
951 case ACPI_SIGNAL_FATAL:
952 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
954 case ACPI_SIGNAL_BREAKPOINT:
957 * ACPI spec. says to treat it as a NOP unless
958 * you are debugging. So if/when we integrate
959 * AML debugger into the kernel debugger its
960 * hook will go here. But until then it is
961 * not useful to print anything on breakpoints.
971 static int __init acpi_os_name_setup(char *str)
973 char *p = acpi_os_name;
974 int count = ACPI_MAX_OVERRIDE_LEN - 1;
979 for (; count-- && str && *str; str++) {
980 if (isalnum(*str) || *str == ' ' || *str == ':')
982 else if (*str == '\'' || *str == '"')
993 __setup("acpi_os_name=", acpi_os_name_setup);
995 static void __init set_osi_linux(unsigned int enable)
997 if (osi_linux.enable != enable) {
998 osi_linux.enable = enable;
999 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1000 enable ? "Add": "Delet");
1005 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1007 osi_linux.cmdline = 1; /* cmdline set the default */
1008 set_osi_linux(enable);
1013 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1015 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1017 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1022 osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */
1024 set_osi_linux(enable);
1030 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1032 * empty string disables _OSI
1033 * string starting with '!' disables that string
1034 * otherwise string is added to list, augmenting built-in strings
1036 static int __init acpi_osi_setup(char *str)
1038 if (str == NULL || *str == '\0') {
1039 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1040 acpi_gbl_create_osi_method = FALSE;
1041 } else if (!strcmp("!Linux", str)) {
1042 acpi_cmdline_osi_linux(0); /* !enable */
1043 } else if (*str == '!') {
1044 if (acpi_osi_invalidate(++str) == AE_OK)
1045 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1046 } else if (!strcmp("Linux", str)) {
1047 acpi_cmdline_osi_linux(1); /* enable */
1048 } else if (*osi_additional_string == '\0') {
1049 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1050 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1056 __setup("acpi_osi=", acpi_osi_setup);
1058 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1059 static int __init acpi_serialize_setup(char *str)
1061 printk(KERN_INFO PREFIX "serialize enabled\n");
1063 acpi_gbl_all_methods_serialized = TRUE;
1068 __setup("acpi_serialize", acpi_serialize_setup);
1071 * Wake and Run-Time GPES are expected to be separate.
1072 * We disable wake-GPEs at run-time to prevent spurious
1075 * However, if a system exists that shares Wake and
1076 * Run-time events on the same GPE this flag is available
1077 * to tell Linux to keep the wake-time GPEs enabled at run-time.
1079 static int __init acpi_wake_gpes_always_on_setup(char *str)
1081 printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1083 acpi_gbl_leave_wake_gpes_disabled = FALSE;
1088 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1090 /* Check of resource interference between native drivers and ACPI
1091 * OperationRegions (SystemIO and System Memory only).
1092 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1093 * in arbitrary AML code and can interfere with legacy drivers.
1094 * acpi_enforce_resources= can be set to:
1097 * -> further driver trying to access the resources will not load
1098 * - lax (default) (1)
1099 * -> further driver trying to access the resources will load, but you
1100 * get a system message that something might go wrong...
1103 * -> ACPI Operation Region resources will not be registered
1106 #define ENFORCE_RESOURCES_STRICT 2
1107 #define ENFORCE_RESOURCES_LAX 1
1108 #define ENFORCE_RESOURCES_NO 0
1110 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1112 static int __init acpi_enforce_resources_setup(char *str)
1114 if (str == NULL || *str == '\0')
1117 if (!strcmp("strict", str))
1118 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1119 else if (!strcmp("lax", str))
1120 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1121 else if (!strcmp("no", str))
1122 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1127 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1129 /* Check for resource conflicts between ACPI OperationRegions and native
1131 int acpi_check_resource_conflict(struct resource *res)
1133 struct acpi_res_list *res_list_elem;
1137 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1139 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1142 ioport = res->flags & IORESOURCE_IO;
1144 spin_lock(&acpi_res_lock);
1145 list_for_each_entry(res_list_elem, &resource_list_head,
1147 if (ioport && (res_list_elem->resource_type
1148 != ACPI_ADR_SPACE_SYSTEM_IO))
1150 if (!ioport && (res_list_elem->resource_type
1151 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1154 if (res->end < res_list_elem->start
1155 || res_list_elem->end < res->start)
1160 spin_unlock(&acpi_res_lock);
1163 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1164 printk(KERN_INFO "%sACPI: %s resource %s [0x%llx-0x%llx]"
1165 " conflicts with ACPI region %s"
1166 " [0x%llx-0x%llx]\n",
1167 acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1168 ? KERN_WARNING : KERN_ERR,
1169 ioport ? "I/O" : "Memory", res->name,
1170 (long long) res->start, (long long) res->end,
1171 res_list_elem->name,
1172 (long long) res_list_elem->start,
1173 (long long) res_list_elem->end);
1174 printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1176 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1181 EXPORT_SYMBOL(acpi_check_resource_conflict);
1183 int acpi_check_region(resource_size_t start, resource_size_t n,
1186 struct resource res = {
1188 .end = start + n - 1,
1190 .flags = IORESOURCE_IO,
1193 return acpi_check_resource_conflict(&res);
1195 EXPORT_SYMBOL(acpi_check_region);
1197 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1200 struct resource res = {
1202 .end = start + n - 1,
1204 .flags = IORESOURCE_MEM,
1207 return acpi_check_resource_conflict(&res);
1210 EXPORT_SYMBOL(acpi_check_mem_region);
1213 * Acquire a spinlock.
1215 * handle is a pointer to the spinlock_t.
1218 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1220 acpi_cpu_flags flags;
1221 spin_lock_irqsave(lockp, flags);
1226 * Release a spinlock. See above.
1229 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1231 spin_unlock_irqrestore(lockp, flags);
1234 #ifndef ACPI_USE_LOCAL_CACHE
1236 /*******************************************************************************
1238 * FUNCTION: acpi_os_create_cache
1240 * PARAMETERS: name - Ascii name for the cache
1241 * size - Size of each cached object
1242 * depth - Maximum depth of the cache (in objects) <ignored>
1243 * cache - Where the new cache object is returned
1247 * DESCRIPTION: Create a cache object
1249 ******************************************************************************/
1252 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1254 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1261 /*******************************************************************************
1263 * FUNCTION: acpi_os_purge_cache
1265 * PARAMETERS: Cache - Handle to cache object
1269 * DESCRIPTION: Free all objects within the requested cache.
1271 ******************************************************************************/
1273 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1275 kmem_cache_shrink(cache);
1279 /*******************************************************************************
1281 * FUNCTION: acpi_os_delete_cache
1283 * PARAMETERS: Cache - Handle to cache object
1287 * DESCRIPTION: Free all objects within the requested cache and delete the
1290 ******************************************************************************/
1292 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1294 kmem_cache_destroy(cache);
1298 /*******************************************************************************
1300 * FUNCTION: acpi_os_release_object
1302 * PARAMETERS: Cache - Handle to cache object
1303 * Object - The object to be released
1307 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1308 * the object is deleted.
1310 ******************************************************************************/
1312 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1314 kmem_cache_free(cache, object);
1319 * acpi_dmi_dump - dump DMI slots needed for blacklist entry
1321 * Returns 0 on success
1323 static int acpi_dmi_dump(void)
1329 printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1330 dmi_get_system_info(DMI_SYS_VENDOR));
1331 printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1332 dmi_get_system_info(DMI_PRODUCT_NAME));
1333 printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1334 dmi_get_system_info(DMI_PRODUCT_VERSION));
1335 printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1336 dmi_get_system_info(DMI_BOARD_NAME));
1337 printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1338 dmi_get_system_info(DMI_BIOS_VENDOR));
1339 printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1340 dmi_get_system_info(DMI_BIOS_DATE));
1346 /******************************************************************************
1348 * FUNCTION: acpi_os_validate_interface
1350 * PARAMETERS: interface - Requested interface to be validated
1352 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise
1354 * DESCRIPTION: Match an interface string to the interfaces supported by the
1355 * host. Strings originate from an AML call to the _OSI method.
1357 *****************************************************************************/
1360 acpi_os_validate_interface (char *interface)
1362 if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1364 if (!strcmp("Linux", interface)) {
1366 printk(KERN_NOTICE PREFIX
1367 "BIOS _OSI(Linux) query %s%s\n",
1368 osi_linux.enable ? "honored" : "ignored",
1369 osi_linux.cmdline ? " via cmdline" :
1370 osi_linux.dmi ? " via DMI" : "");
1372 if (!osi_linux.dmi) {
1373 if (acpi_dmi_dump())
1374 printk(KERN_NOTICE PREFIX
1375 "[please extract dmidecode output]\n");
1376 printk(KERN_NOTICE PREFIX
1377 "Please send DMI info above to "
1378 "linux-acpi@vger.kernel.org\n");
1380 if (!osi_linux.known && !osi_linux.cmdline) {
1381 printk(KERN_NOTICE PREFIX
1382 "If \"acpi_osi=%sLinux\" works better, "
1383 "please notify linux-acpi@vger.kernel.org\n",
1384 osi_linux.enable ? "!" : "");
1387 if (osi_linux.enable)
1393 /******************************************************************************
1395 * FUNCTION: acpi_os_validate_address
1397 * PARAMETERS: space_id - ACPI space ID
1398 * address - Physical address
1399 * length - Address length
1401 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1402 * should return AE_AML_ILLEGAL_ADDRESS.
1404 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1405 * the addresses accessed by AML operation regions.
1407 *****************************************************************************/
1410 acpi_os_validate_address (
1412 acpi_physical_address address,
1416 struct acpi_res_list *res;
1417 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1421 case ACPI_ADR_SPACE_SYSTEM_IO:
1422 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1423 /* Only interference checks against SystemIO and SytemMemory
1425 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1428 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1429 strlcpy(res->name, name, 5);
1430 res->start = address;
1431 res->end = address + length - 1;
1432 res->resource_type = space_id;
1433 spin_lock(&acpi_res_lock);
1434 list_add(&res->resource_list, &resource_list_head);
1435 spin_unlock(&acpi_res_lock);
1436 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1437 "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1438 ? "SystemIO" : "System Memory",
1439 (unsigned long long)res->start,
1440 (unsigned long long)res->end,
1443 case ACPI_ADR_SPACE_PCI_CONFIG:
1444 case ACPI_ADR_SPACE_EC:
1445 case ACPI_ADR_SPACE_SMBUS:
1446 case ACPI_ADR_SPACE_CMOS:
1447 case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1448 case ACPI_ADR_SPACE_DATA_TABLE:
1449 case ACPI_ADR_SPACE_FIXED_HARDWARE: