Memory controller: accounting setup
[linux-2.6/mini2440.git] / drivers / acpi / osl.c
blobe53fb516f9d45538dbfdedc002ad3dcb753e200e
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>
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>
31 #include <linux/mm.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>
41 #include <asm/io.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/processor.h>
44 #include <asm/uaccess.h>
46 #include <linux/efi.h>
48 #define _COMPONENT ACPI_OS_SERVICES
49 ACPI_MODULE_NAME("osl");
50 #define PREFIX "ACPI: "
51 struct acpi_os_dpc {
52 acpi_osd_exec_callback function;
53 void *context;
54 struct work_struct work;
57 #ifdef CONFIG_ACPI_CUSTOM_DSDT
58 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
59 #endif
61 #ifdef ENABLE_DEBUGGER
62 #include <linux/kdb.h>
64 /* stuff for debugger support */
65 int acpi_in_debugger;
66 EXPORT_SYMBOL(acpi_in_debugger);
68 extern char line_buf[80];
69 #endif /*ENABLE_DEBUGGER */
71 static unsigned int acpi_irq_irq;
72 static acpi_osd_handler acpi_irq_handler;
73 static void *acpi_irq_context;
74 static struct workqueue_struct *kacpid_wq;
75 static struct workqueue_struct *kacpi_notify_wq;
77 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
78 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
81 * "Ode to _OSI(Linux)"
83 * osi_linux -- Control response to BIOS _OSI(Linux) query.
85 * As Linux evolves, the features that it supports change.
86 * So an OSI string such as "Linux" is not specific enough
87 * to be useful across multiple versions of Linux. It
88 * doesn't identify any particular feature, interface,
89 * or even any particular version of Linux...
91 * Unfortunately, Linux-2.6.22 and earlier responded "yes"
92 * to a BIOS _OSI(Linux) query. When
93 * a reference mobile BIOS started using it, its use
94 * started to spread to many vendor platforms.
95 * As it is not supportable, we need to halt that spread.
97 * Today, most BIOS references to _OSI(Linux) are noise --
98 * they have no functional effect and are just dead code
99 * carried over from the reference BIOS.
101 * The next most common case is that _OSI(Linux) harms Linux,
102 * usually by causing the BIOS to follow paths that are
103 * not tested during Windows validation.
105 * Finally, there is a short list of platforms
106 * where OSI(Linux) benefits Linux.
108 * In Linux-2.6.23, OSI(Linux) is first disabled by default.
109 * DMI is used to disable the dmesg warning about OSI(Linux)
110 * on platforms where it is known to have no effect.
111 * But a dmesg warning remains for systems where
112 * we do not know if OSI(Linux) is good or bad for the system.
113 * DMI is also used to enable OSI(Linux) for the machines
114 * that are known to need it.
116 * BIOS writers should NOT query _OSI(Linux) on future systems.
117 * It will be ignored by default, and to get Linux to
118 * not ignore it will require a kernel source update to
119 * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
121 #define OSI_LINUX_ENABLE 0
123 struct osi_linux {
124 unsigned int enable:1;
125 unsigned int dmi:1;
126 unsigned int cmdline:1;
127 unsigned int known:1;
128 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
130 static void __init acpi_request_region (struct acpi_generic_address *addr,
131 unsigned int length, char *desc)
133 struct resource *res;
135 if (!addr->address || !length)
136 return;
138 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
139 res = request_region(addr->address, length, desc);
140 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
141 res = request_mem_region(addr->address, length, desc);
144 static int __init acpi_reserve_resources(void)
146 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
147 "ACPI PM1a_EVT_BLK");
149 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
150 "ACPI PM1b_EVT_BLK");
152 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
153 "ACPI PM1a_CNT_BLK");
155 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
156 "ACPI PM1b_CNT_BLK");
158 if (acpi_gbl_FADT.pm_timer_length == 4)
159 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
161 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
162 "ACPI PM2_CNT_BLK");
164 /* Length of GPE blocks must be a non-negative multiple of 2 */
166 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
167 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
168 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
170 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
171 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
172 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
174 return 0;
176 device_initcall(acpi_reserve_resources);
178 acpi_status __init acpi_os_initialize(void)
180 return AE_OK;
183 acpi_status acpi_os_initialize1(void)
186 * Initialize PCI configuration space access, as we'll need to access
187 * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
189 if (!raw_pci_ops) {
190 printk(KERN_ERR PREFIX
191 "Access to PCI configuration space unavailable\n");
192 return AE_NULL_ENTRY;
194 kacpid_wq = create_singlethread_workqueue("kacpid");
195 kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
196 BUG_ON(!kacpid_wq);
197 BUG_ON(!kacpi_notify_wq);
198 return AE_OK;
201 acpi_status acpi_os_terminate(void)
203 if (acpi_irq_handler) {
204 acpi_os_remove_interrupt_handler(acpi_irq_irq,
205 acpi_irq_handler);
208 destroy_workqueue(kacpid_wq);
209 destroy_workqueue(kacpi_notify_wq);
211 return AE_OK;
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 EXPORT_SYMBOL(acpi_os_printf);
224 void acpi_os_vprintf(const char *fmt, va_list args)
226 static char buffer[512];
228 vsprintf(buffer, fmt, args);
230 #ifdef ENABLE_DEBUGGER
231 if (acpi_in_debugger) {
232 kdb_printf("%s", buffer);
233 } else {
234 printk("%s", buffer);
236 #else
237 printk("%s", buffer);
238 #endif
241 acpi_physical_address __init acpi_os_get_root_pointer(void)
243 if (efi_enabled) {
244 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
245 return efi.acpi20;
246 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
247 return efi.acpi;
248 else {
249 printk(KERN_ERR PREFIX
250 "System description tables not found\n");
251 return 0;
253 } else
254 return acpi_find_rsdp();
257 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
259 if (phys > ULONG_MAX) {
260 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
261 return NULL;
263 if (acpi_gbl_permanent_mmap)
265 * ioremap checks to ensure this is in reserved space
267 return ioremap((unsigned long)phys, size);
268 else
269 return __acpi_map_table((unsigned long)phys, size);
271 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
273 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
275 if (acpi_gbl_permanent_mmap) {
276 iounmap(virt);
279 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
281 #ifdef ACPI_FUTURE_USAGE
282 acpi_status
283 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
285 if (!phys || !virt)
286 return AE_BAD_PARAMETER;
288 *phys = virt_to_phys(virt);
290 return AE_OK;
292 #endif
294 #define ACPI_MAX_OVERRIDE_LEN 100
296 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
298 acpi_status
299 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
300 acpi_string * new_val)
302 if (!init_val || !new_val)
303 return AE_BAD_PARAMETER;
305 *new_val = NULL;
306 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
307 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
308 acpi_os_name);
309 *new_val = acpi_os_name;
312 return AE_OK;
315 acpi_status
316 acpi_os_table_override(struct acpi_table_header * existing_table,
317 struct acpi_table_header ** new_table)
319 if (!existing_table || !new_table)
320 return AE_BAD_PARAMETER;
322 #ifdef CONFIG_ACPI_CUSTOM_DSDT
323 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
324 *new_table = (struct acpi_table_header *)AmlCode;
325 else
326 *new_table = NULL;
327 #else
328 *new_table = NULL;
329 #endif
330 return AE_OK;
333 static irqreturn_t acpi_irq(int irq, void *dev_id)
335 return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
338 acpi_status
339 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
340 void *context)
342 unsigned int irq;
345 * Ignore the GSI from the core, and use the value in our copy of the
346 * FADT. It may not be the same if an interrupt source override exists
347 * for the SCI.
349 gsi = acpi_gbl_FADT.sci_interrupt;
350 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
351 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
352 gsi);
353 return AE_OK;
356 acpi_irq_handler = handler;
357 acpi_irq_context = context;
358 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
359 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
360 return AE_NOT_ACQUIRED;
362 acpi_irq_irq = irq;
364 return AE_OK;
367 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
369 if (irq) {
370 free_irq(irq, acpi_irq);
371 acpi_irq_handler = NULL;
372 acpi_irq_irq = 0;
375 return AE_OK;
379 * Running in interpreter thread context, safe to sleep
382 void acpi_os_sleep(acpi_integer ms)
384 schedule_timeout_interruptible(msecs_to_jiffies(ms));
387 EXPORT_SYMBOL(acpi_os_sleep);
389 void acpi_os_stall(u32 us)
391 while (us) {
392 u32 delay = 1000;
394 if (delay > us)
395 delay = us;
396 udelay(delay);
397 touch_nmi_watchdog();
398 us -= delay;
402 EXPORT_SYMBOL(acpi_os_stall);
405 * Support ACPI 3.0 AML Timer operand
406 * Returns 64-bit free-running, monotonically increasing timer
407 * with 100ns granularity
409 u64 acpi_os_get_timer(void)
411 static u64 t;
413 #ifdef CONFIG_HPET
414 /* TBD: use HPET if available */
415 #endif
417 #ifdef CONFIG_X86_PM_TIMER
418 /* TBD: default to PM timer if HPET was not available */
419 #endif
420 if (!t)
421 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
423 return ++t;
426 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
428 u32 dummy;
430 if (!value)
431 value = &dummy;
433 *value = 0;
434 if (width <= 8) {
435 *(u8 *) value = inb(port);
436 } else if (width <= 16) {
437 *(u16 *) value = inw(port);
438 } else if (width <= 32) {
439 *(u32 *) value = inl(port);
440 } else {
441 BUG();
444 return AE_OK;
447 EXPORT_SYMBOL(acpi_os_read_port);
449 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
451 if (width <= 8) {
452 outb(value, port);
453 } else if (width <= 16) {
454 outw(value, port);
455 } else if (width <= 32) {
456 outl(value, port);
457 } else {
458 BUG();
461 return AE_OK;
464 EXPORT_SYMBOL(acpi_os_write_port);
466 acpi_status
467 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
469 u32 dummy;
470 void __iomem *virt_addr;
472 virt_addr = ioremap(phys_addr, width);
473 if (!value)
474 value = &dummy;
476 switch (width) {
477 case 8:
478 *(u8 *) value = readb(virt_addr);
479 break;
480 case 16:
481 *(u16 *) value = readw(virt_addr);
482 break;
483 case 32:
484 *(u32 *) value = readl(virt_addr);
485 break;
486 default:
487 BUG();
490 iounmap(virt_addr);
492 return AE_OK;
495 acpi_status
496 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
498 void __iomem *virt_addr;
500 virt_addr = ioremap(phys_addr, width);
502 switch (width) {
503 case 8:
504 writeb(value, virt_addr);
505 break;
506 case 16:
507 writew(value, virt_addr);
508 break;
509 case 32:
510 writel(value, virt_addr);
511 break;
512 default:
513 BUG();
516 iounmap(virt_addr);
518 return AE_OK;
521 acpi_status
522 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
523 void *value, u32 width)
525 int result, size;
527 if (!value)
528 return AE_BAD_PARAMETER;
530 switch (width) {
531 case 8:
532 size = 1;
533 break;
534 case 16:
535 size = 2;
536 break;
537 case 32:
538 size = 4;
539 break;
540 default:
541 return AE_ERROR;
544 BUG_ON(!raw_pci_ops);
546 result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
547 PCI_DEVFN(pci_id->device, pci_id->function),
548 reg, size, value);
550 return (result ? AE_ERROR : AE_OK);
553 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
555 acpi_status
556 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
557 acpi_integer value, u32 width)
559 int result, size;
561 switch (width) {
562 case 8:
563 size = 1;
564 break;
565 case 16:
566 size = 2;
567 break;
568 case 32:
569 size = 4;
570 break;
571 default:
572 return AE_ERROR;
575 BUG_ON(!raw_pci_ops);
577 result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
578 PCI_DEVFN(pci_id->device, pci_id->function),
579 reg, size, value);
581 return (result ? AE_ERROR : AE_OK);
584 /* TODO: Change code to take advantage of driver model more */
585 static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */
586 acpi_handle chandle, /* current node */
587 struct acpi_pci_id **id,
588 int *is_bridge, u8 * bus_number)
590 acpi_handle handle;
591 struct acpi_pci_id *pci_id = *id;
592 acpi_status status;
593 unsigned long temp;
594 acpi_object_type type;
595 u8 tu8;
597 acpi_get_parent(chandle, &handle);
598 if (handle != rhandle) {
599 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
600 bus_number);
602 status = acpi_get_type(handle, &type);
603 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
604 return;
606 status =
607 acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
608 &temp);
609 if (ACPI_SUCCESS(status)) {
610 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
611 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
613 if (*is_bridge)
614 pci_id->bus = *bus_number;
616 /* any nicer way to get bus number of bridge ? */
617 status =
618 acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
620 if (ACPI_SUCCESS(status)
621 && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
622 status =
623 acpi_os_read_pci_configuration(pci_id, 0x18,
624 &tu8, 8);
625 if (!ACPI_SUCCESS(status)) {
626 /* Certainly broken... FIX ME */
627 return;
629 *is_bridge = 1;
630 pci_id->bus = tu8;
631 status =
632 acpi_os_read_pci_configuration(pci_id, 0x19,
633 &tu8, 8);
634 if (ACPI_SUCCESS(status)) {
635 *bus_number = tu8;
637 } else
638 *is_bridge = 0;
643 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */
644 acpi_handle chandle, /* current node */
645 struct acpi_pci_id **id)
647 int is_bridge = 1;
648 u8 bus_number = (*id)->bus;
650 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
653 static void acpi_os_execute_deferred(struct work_struct *work)
655 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
656 if (!dpc) {
657 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
658 return;
661 dpc->function(dpc->context);
662 kfree(dpc);
664 /* Yield cpu to notify thread */
665 cond_resched();
667 return;
670 static void acpi_os_execute_notify(struct work_struct *work)
672 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
674 if (!dpc) {
675 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
676 return;
679 dpc->function(dpc->context);
681 kfree(dpc);
683 return;
686 /*******************************************************************************
688 * FUNCTION: acpi_os_execute
690 * PARAMETERS: Type - Type of the callback
691 * Function - Function to be executed
692 * Context - Function parameters
694 * RETURN: Status
696 * DESCRIPTION: Depending on type, either queues function for deferred execution or
697 * immediately executes function on a separate thread.
699 ******************************************************************************/
701 acpi_status acpi_os_execute(acpi_execute_type type,
702 acpi_osd_exec_callback function, void *context)
704 acpi_status status = AE_OK;
705 struct acpi_os_dpc *dpc;
707 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
708 "Scheduling function [%p(%p)] for deferred execution.\n",
709 function, context));
711 if (!function)
712 return AE_BAD_PARAMETER;
715 * Allocate/initialize DPC structure. Note that this memory will be
716 * freed by the callee. The kernel handles the work_struct list in a
717 * way that allows us to also free its memory inside the callee.
718 * Because we may want to schedule several tasks with different
719 * parameters we can't use the approach some kernel code uses of
720 * having a static work_struct.
723 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
724 if (!dpc)
725 return_ACPI_STATUS(AE_NO_MEMORY);
727 dpc->function = function;
728 dpc->context = context;
730 if (type == OSL_NOTIFY_HANDLER) {
731 INIT_WORK(&dpc->work, acpi_os_execute_notify);
732 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
733 status = AE_ERROR;
734 kfree(dpc);
736 } else {
737 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
738 if (!queue_work(kacpid_wq, &dpc->work)) {
739 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
740 "Call to queue_work() failed.\n"));
741 status = AE_ERROR;
742 kfree(dpc);
745 return_ACPI_STATUS(status);
748 EXPORT_SYMBOL(acpi_os_execute);
750 void acpi_os_wait_events_complete(void *context)
752 flush_workqueue(kacpid_wq);
755 EXPORT_SYMBOL(acpi_os_wait_events_complete);
758 * Allocate the memory for a spinlock and initialize it.
760 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
762 spin_lock_init(*handle);
764 return AE_OK;
768 * Deallocate the memory for a spinlock.
770 void acpi_os_delete_lock(acpi_spinlock handle)
772 return;
775 acpi_status
776 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
778 struct semaphore *sem = NULL;
781 sem = acpi_os_allocate(sizeof(struct semaphore));
782 if (!sem)
783 return AE_NO_MEMORY;
784 memset(sem, 0, sizeof(struct semaphore));
786 sema_init(sem, initial_units);
788 *handle = (acpi_handle *) sem;
790 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
791 *handle, initial_units));
793 return AE_OK;
796 EXPORT_SYMBOL(acpi_os_create_semaphore);
799 * TODO: A better way to delete semaphores? Linux doesn't have a
800 * 'delete_semaphore()' function -- may result in an invalid
801 * pointer dereference for non-synchronized consumers. Should
802 * we at least check for blocked threads and signal/cancel them?
805 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
807 struct semaphore *sem = (struct semaphore *)handle;
810 if (!sem)
811 return AE_BAD_PARAMETER;
813 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
815 kfree(sem);
816 sem = NULL;
818 return AE_OK;
821 EXPORT_SYMBOL(acpi_os_delete_semaphore);
824 * TODO: The kernel doesn't have a 'down_timeout' function -- had to
825 * improvise. The process is to sleep for one scheduler quantum
826 * until the semaphore becomes available. Downside is that this
827 * may result in starvation for timeout-based waits when there's
828 * lots of semaphore activity.
830 * TODO: Support for units > 1?
832 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
834 acpi_status status = AE_OK;
835 struct semaphore *sem = (struct semaphore *)handle;
836 int ret = 0;
839 if (!sem || (units < 1))
840 return AE_BAD_PARAMETER;
842 if (units > 1)
843 return AE_SUPPORT;
845 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
846 handle, units, timeout));
849 * This can be called during resume with interrupts off.
850 * Like boot-time, we should be single threaded and will
851 * always get the lock if we try -- timeout or not.
852 * If this doesn't succeed, then we will oops courtesy of
853 * might_sleep() in down().
855 if (!down_trylock(sem))
856 return AE_OK;
858 switch (timeout) {
860 * No Wait:
861 * --------
862 * A zero timeout value indicates that we shouldn't wait - just
863 * acquire the semaphore if available otherwise return AE_TIME
864 * (a.k.a. 'would block').
866 case 0:
867 if (down_trylock(sem))
868 status = AE_TIME;
869 break;
872 * Wait Indefinitely:
873 * ------------------
875 case ACPI_WAIT_FOREVER:
876 down(sem);
877 break;
880 * Wait w/ Timeout:
881 * ----------------
883 default:
884 // TODO: A better timeout algorithm?
886 int i = 0;
887 static const int quantum_ms = 1000 / HZ;
889 ret = down_trylock(sem);
890 for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
891 schedule_timeout_interruptible(1);
892 ret = down_trylock(sem);
895 if (ret != 0)
896 status = AE_TIME;
898 break;
901 if (ACPI_FAILURE(status)) {
902 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
903 "Failed to acquire semaphore[%p|%d|%d], %s",
904 handle, units, timeout,
905 acpi_format_exception(status)));
906 } else {
907 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
908 "Acquired semaphore[%p|%d|%d]", handle,
909 units, timeout));
912 return status;
915 EXPORT_SYMBOL(acpi_os_wait_semaphore);
918 * TODO: Support for units > 1?
920 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
922 struct semaphore *sem = (struct semaphore *)handle;
925 if (!sem || (units < 1))
926 return AE_BAD_PARAMETER;
928 if (units > 1)
929 return AE_SUPPORT;
931 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
932 units));
934 up(sem);
936 return AE_OK;
939 EXPORT_SYMBOL(acpi_os_signal_semaphore);
941 #ifdef ACPI_FUTURE_USAGE
942 u32 acpi_os_get_line(char *buffer)
945 #ifdef ENABLE_DEBUGGER
946 if (acpi_in_debugger) {
947 u32 chars;
949 kdb_read(buffer, sizeof(line_buf));
951 /* remove the CR kdb includes */
952 chars = strlen(buffer) - 1;
953 buffer[chars] = '\0';
955 #endif
957 return 0;
959 #endif /* ACPI_FUTURE_USAGE */
961 acpi_status acpi_os_signal(u32 function, void *info)
963 switch (function) {
964 case ACPI_SIGNAL_FATAL:
965 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
966 break;
967 case ACPI_SIGNAL_BREAKPOINT:
969 * AML Breakpoint
970 * ACPI spec. says to treat it as a NOP unless
971 * you are debugging. So if/when we integrate
972 * AML debugger into the kernel debugger its
973 * hook will go here. But until then it is
974 * not useful to print anything on breakpoints.
976 break;
977 default:
978 break;
981 return AE_OK;
984 EXPORT_SYMBOL(acpi_os_signal);
986 static int __init acpi_os_name_setup(char *str)
988 char *p = acpi_os_name;
989 int count = ACPI_MAX_OVERRIDE_LEN - 1;
991 if (!str || !*str)
992 return 0;
994 for (; count-- && str && *str; str++) {
995 if (isalnum(*str) || *str == ' ' || *str == ':')
996 *p++ = *str;
997 else if (*str == '\'' || *str == '"')
998 continue;
999 else
1000 break;
1002 *p = 0;
1004 return 1;
1008 __setup("acpi_os_name=", acpi_os_name_setup);
1010 static void __init set_osi_linux(unsigned int enable)
1012 if (osi_linux.enable != enable) {
1013 osi_linux.enable = enable;
1014 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1015 enable ? "Add": "Delet");
1017 return;
1020 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1022 osi_linux.cmdline = 1; /* cmdline set the default */
1023 set_osi_linux(enable);
1025 return;
1028 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1030 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1032 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1034 if (enable == -1)
1035 return;
1037 osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */
1039 set_osi_linux(enable);
1041 return;
1045 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1047 * empty string disables _OSI
1048 * string starting with '!' disables that string
1049 * otherwise string is added to list, augmenting built-in strings
1051 static int __init acpi_osi_setup(char *str)
1053 if (str == NULL || *str == '\0') {
1054 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1055 acpi_gbl_create_osi_method = FALSE;
1056 } else if (!strcmp("!Linux", str)) {
1057 acpi_cmdline_osi_linux(0); /* !enable */
1058 } else if (*str == '!') {
1059 if (acpi_osi_invalidate(++str) == AE_OK)
1060 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1061 } else if (!strcmp("Linux", str)) {
1062 acpi_cmdline_osi_linux(1); /* enable */
1063 } else if (*osi_additional_string == '\0') {
1064 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1065 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1068 return 1;
1071 __setup("acpi_osi=", acpi_osi_setup);
1073 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1074 static int __init acpi_serialize_setup(char *str)
1076 printk(KERN_INFO PREFIX "serialize enabled\n");
1078 acpi_gbl_all_methods_serialized = TRUE;
1080 return 1;
1083 __setup("acpi_serialize", acpi_serialize_setup);
1086 * Wake and Run-Time GPES are expected to be separate.
1087 * We disable wake-GPEs at run-time to prevent spurious
1088 * interrupts.
1090 * However, if a system exists that shares Wake and
1091 * Run-time events on the same GPE this flag is available
1092 * to tell Linux to keep the wake-time GPEs enabled at run-time.
1094 static int __init acpi_wake_gpes_always_on_setup(char *str)
1096 printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1098 acpi_gbl_leave_wake_gpes_disabled = FALSE;
1100 return 1;
1103 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1106 * Acquire a spinlock.
1108 * handle is a pointer to the spinlock_t.
1111 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1113 acpi_cpu_flags flags;
1114 spin_lock_irqsave(lockp, flags);
1115 return flags;
1119 * Release a spinlock. See above.
1122 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1124 spin_unlock_irqrestore(lockp, flags);
1127 #ifndef ACPI_USE_LOCAL_CACHE
1129 /*******************************************************************************
1131 * FUNCTION: acpi_os_create_cache
1133 * PARAMETERS: name - Ascii name for the cache
1134 * size - Size of each cached object
1135 * depth - Maximum depth of the cache (in objects) <ignored>
1136 * cache - Where the new cache object is returned
1138 * RETURN: status
1140 * DESCRIPTION: Create a cache object
1142 ******************************************************************************/
1144 acpi_status
1145 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1147 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1148 if (*cache == NULL)
1149 return AE_ERROR;
1150 else
1151 return AE_OK;
1154 /*******************************************************************************
1156 * FUNCTION: acpi_os_purge_cache
1158 * PARAMETERS: Cache - Handle to cache object
1160 * RETURN: Status
1162 * DESCRIPTION: Free all objects within the requested cache.
1164 ******************************************************************************/
1166 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1168 kmem_cache_shrink(cache);
1169 return (AE_OK);
1172 /*******************************************************************************
1174 * FUNCTION: acpi_os_delete_cache
1176 * PARAMETERS: Cache - Handle to cache object
1178 * RETURN: Status
1180 * DESCRIPTION: Free all objects within the requested cache and delete the
1181 * cache object.
1183 ******************************************************************************/
1185 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1187 kmem_cache_destroy(cache);
1188 return (AE_OK);
1191 /*******************************************************************************
1193 * FUNCTION: acpi_os_release_object
1195 * PARAMETERS: Cache - Handle to cache object
1196 * Object - The object to be released
1198 * RETURN: None
1200 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1201 * the object is deleted.
1203 ******************************************************************************/
1205 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1207 kmem_cache_free(cache, object);
1208 return (AE_OK);
1212 * acpi_dmi_dump - dump DMI slots needed for blacklist entry
1214 * Returns 0 on success
1216 int acpi_dmi_dump(void)
1219 if (!dmi_available)
1220 return -1;
1222 printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1223 dmi_get_slot(DMI_SYS_VENDOR));
1224 printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1225 dmi_get_slot(DMI_PRODUCT_NAME));
1226 printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1227 dmi_get_slot(DMI_PRODUCT_VERSION));
1228 printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1229 dmi_get_slot(DMI_BOARD_NAME));
1230 printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1231 dmi_get_slot(DMI_BIOS_VENDOR));
1232 printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1233 dmi_get_slot(DMI_BIOS_DATE));
1235 return 0;
1239 /******************************************************************************
1241 * FUNCTION: acpi_os_validate_interface
1243 * PARAMETERS: interface - Requested interface to be validated
1245 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise
1247 * DESCRIPTION: Match an interface string to the interfaces supported by the
1248 * host. Strings originate from an AML call to the _OSI method.
1250 *****************************************************************************/
1252 acpi_status
1253 acpi_os_validate_interface (char *interface)
1255 if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1256 return AE_OK;
1257 if (!strcmp("Linux", interface)) {
1259 printk(KERN_NOTICE PREFIX
1260 "BIOS _OSI(Linux) query %s%s\n",
1261 osi_linux.enable ? "honored" : "ignored",
1262 osi_linux.cmdline ? " via cmdline" :
1263 osi_linux.dmi ? " via DMI" : "");
1265 if (!osi_linux.dmi) {
1266 if (acpi_dmi_dump())
1267 printk(KERN_NOTICE PREFIX
1268 "[please extract dmidecode output]\n");
1269 printk(KERN_NOTICE PREFIX
1270 "Please send DMI info above to "
1271 "linux-acpi@vger.kernel.org\n");
1273 if (!osi_linux.known && !osi_linux.cmdline) {
1274 printk(KERN_NOTICE PREFIX
1275 "If \"acpi_osi=%sLinux\" works better, "
1276 "please notify linux-acpi@vger.kernel.org\n",
1277 osi_linux.enable ? "!" : "");
1280 if (osi_linux.enable)
1281 return AE_OK;
1283 return AE_SUPPORT;
1286 /******************************************************************************
1288 * FUNCTION: acpi_os_validate_address
1290 * PARAMETERS: space_id - ACPI space ID
1291 * address - Physical address
1292 * length - Address length
1294 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
1295 * should return AE_AML_ILLEGAL_ADDRESS.
1297 * DESCRIPTION: Validate a system address via the host OS. Used to validate
1298 * the addresses accessed by AML operation regions.
1300 *****************************************************************************/
1302 acpi_status
1303 acpi_os_validate_address (
1304 u8 space_id,
1305 acpi_physical_address address,
1306 acpi_size length)
1309 return AE_OK;
1312 #endif