ACPI: ibm-acpi: do not use / in driver names
[linux-2.6] / drivers / acpi / osl.c
1 /*
2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3  *
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  *
8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
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.
14  *
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.
19  *
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
23  *
24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25  *
26  */
27
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/smp_lock.h>
34 #include <linux/interrupt.h>
35 #include <linux/kmod.h>
36 #include <linux/delay.h>
37 #include <linux/workqueue.h>
38 #include <linux/nmi.h>
39 #include <acpi/acpi.h>
40 #include <asm/io.h>
41 #include <acpi/acpi_bus.h>
42 #include <acpi/processor.h>
43 #include <asm/uaccess.h>
44
45 #include <linux/efi.h>
46
47 #define _COMPONENT              ACPI_OS_SERVICES
48 ACPI_MODULE_NAME("osl")
49 #define PREFIX          "ACPI: "
50 struct acpi_os_dpc {
51         acpi_osd_exec_callback function;
52         void *context;
53 };
54
55 #ifdef CONFIG_ACPI_CUSTOM_DSDT
56 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
57 #endif
58
59 #ifdef ENABLE_DEBUGGER
60 #include <linux/kdb.h>
61
62 /* stuff for debugger support */
63 int acpi_in_debugger;
64 EXPORT_SYMBOL(acpi_in_debugger);
65
66 extern char line_buf[80];
67 #endif                          /*ENABLE_DEBUGGER */
68
69 int acpi_specific_hotkey_enabled = TRUE;
70 EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
71
72 static unsigned int acpi_irq_irq;
73 static acpi_osd_handler acpi_irq_handler;
74 static void *acpi_irq_context;
75 static struct workqueue_struct *kacpid_wq;
76 static struct workqueue_struct *kacpi_notify_wq;
77
78 acpi_status acpi_os_initialize(void)
79 {
80         return AE_OK;
81 }
82
83 acpi_status acpi_os_initialize1(void)
84 {
85         /*
86          * Initialize PCI configuration space access, as we'll need to access
87          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
88          */
89         if (!raw_pci_ops) {
90                 printk(KERN_ERR PREFIX
91                        "Access to PCI configuration space unavailable\n");
92                 return AE_NULL_ENTRY;
93         }
94         kacpid_wq = create_singlethread_workqueue("kacpid");
95         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
96         BUG_ON(!kacpid_wq);
97         BUG_ON(!kacpi_notify_wq);
98         return AE_OK;
99 }
100
101 acpi_status acpi_os_terminate(void)
102 {
103         if (acpi_irq_handler) {
104                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
105                                                  acpi_irq_handler);
106         }
107
108         destroy_workqueue(kacpid_wq);
109         destroy_workqueue(kacpi_notify_wq);
110
111         return AE_OK;
112 }
113
114 void acpi_os_printf(const char *fmt, ...)
115 {
116         va_list args;
117         va_start(args, fmt);
118         acpi_os_vprintf(fmt, args);
119         va_end(args);
120 }
121
122 EXPORT_SYMBOL(acpi_os_printf);
123
124 void acpi_os_vprintf(const char *fmt, va_list args)
125 {
126         static char buffer[512];
127
128         vsprintf(buffer, fmt, args);
129
130 #ifdef ENABLE_DEBUGGER
131         if (acpi_in_debugger) {
132                 kdb_printf("%s", buffer);
133         } else {
134                 printk("%s", buffer);
135         }
136 #else
137         printk("%s", buffer);
138 #endif
139 }
140
141 acpi_status acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
142 {
143         if (efi_enabled) {
144                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
145                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
146                         addr->pointer.physical = efi.acpi20;
147                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
148                         addr->pointer.physical = efi.acpi;
149                 else {
150                         printk(KERN_ERR PREFIX
151                                "System description tables not found\n");
152                         return AE_NOT_FOUND;
153                 }
154         } else {
155                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
156                         printk(KERN_ERR PREFIX
157                                "System description tables not found\n");
158                         return AE_NOT_FOUND;
159                 }
160         }
161
162         return AE_OK;
163 }
164
165 acpi_status
166 acpi_os_map_memory(acpi_physical_address phys, acpi_size size,
167                    void __iomem ** virt)
168 {
169         if (phys > ULONG_MAX) {
170                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
171                 return AE_BAD_PARAMETER;
172         }
173         /*
174          * ioremap checks to ensure this is in reserved space
175          */
176         *virt = ioremap((unsigned long)phys, size);
177
178         if (!*virt)
179                 return AE_NO_MEMORY;
180
181         return AE_OK;
182 }
183 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
184
185 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
186 {
187         iounmap(virt);
188 }
189 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
190
191 #ifdef ACPI_FUTURE_USAGE
192 acpi_status
193 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
194 {
195         if (!phys || !virt)
196                 return AE_BAD_PARAMETER;
197
198         *phys = virt_to_phys(virt);
199
200         return AE_OK;
201 }
202 #endif
203
204 #define ACPI_MAX_OVERRIDE_LEN 100
205
206 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
207
208 acpi_status
209 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
210                             acpi_string * new_val)
211 {
212         if (!init_val || !new_val)
213                 return AE_BAD_PARAMETER;
214
215         *new_val = NULL;
216         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
217                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
218                        acpi_os_name);
219                 *new_val = acpi_os_name;
220         }
221
222         return AE_OK;
223 }
224
225 acpi_status
226 acpi_os_table_override(struct acpi_table_header * existing_table,
227                        struct acpi_table_header ** new_table)
228 {
229         if (!existing_table || !new_table)
230                 return AE_BAD_PARAMETER;
231
232 #ifdef CONFIG_ACPI_CUSTOM_DSDT
233         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
234                 *new_table = (struct acpi_table_header *)AmlCode;
235         else
236                 *new_table = NULL;
237 #else
238         *new_table = NULL;
239 #endif
240         return AE_OK;
241 }
242
243 static irqreturn_t acpi_irq(int irq, void *dev_id)
244 {
245         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
246 }
247
248 acpi_status
249 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
250                                   void *context)
251 {
252         unsigned int irq;
253
254         /*
255          * Ignore the GSI from the core, and use the value in our copy of the
256          * FADT. It may not be the same if an interrupt source override exists
257          * for the SCI.
258          */
259         gsi = acpi_fadt.sci_int;
260         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
261                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
262                        gsi);
263                 return AE_OK;
264         }
265
266         acpi_irq_handler = handler;
267         acpi_irq_context = context;
268         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
269                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
270                 return AE_NOT_ACQUIRED;
271         }
272         acpi_irq_irq = irq;
273
274         return AE_OK;
275 }
276
277 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
278 {
279         if (irq) {
280                 free_irq(irq, acpi_irq);
281                 acpi_irq_handler = NULL;
282                 acpi_irq_irq = 0;
283         }
284
285         return AE_OK;
286 }
287
288 /*
289  * Running in interpreter thread context, safe to sleep
290  */
291
292 void acpi_os_sleep(acpi_integer ms)
293 {
294         schedule_timeout_interruptible(msecs_to_jiffies(ms));
295 }
296
297 EXPORT_SYMBOL(acpi_os_sleep);
298
299 void acpi_os_stall(u32 us)
300 {
301         while (us) {
302                 u32 delay = 1000;
303
304                 if (delay > us)
305                         delay = us;
306                 udelay(delay);
307                 touch_nmi_watchdog();
308                 us -= delay;
309         }
310 }
311
312 EXPORT_SYMBOL(acpi_os_stall);
313
314 /*
315  * Support ACPI 3.0 AML Timer operand
316  * Returns 64-bit free-running, monotonically increasing timer
317  * with 100ns granularity
318  */
319 u64 acpi_os_get_timer(void)
320 {
321         static u64 t;
322
323 #ifdef  CONFIG_HPET
324         /* TBD: use HPET if available */
325 #endif
326
327 #ifdef  CONFIG_X86_PM_TIMER
328         /* TBD: default to PM timer if HPET was not available */
329 #endif
330         if (!t)
331                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
332
333         return ++t;
334 }
335
336 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
337 {
338         u32 dummy;
339
340         if (!value)
341                 value = &dummy;
342
343         switch (width) {
344         case 8:
345                 *(u8 *) value = inb(port);
346                 break;
347         case 16:
348                 *(u16 *) value = inw(port);
349                 break;
350         case 32:
351                 *(u32 *) value = inl(port);
352                 break;
353         default:
354                 BUG();
355         }
356
357         return AE_OK;
358 }
359
360 EXPORT_SYMBOL(acpi_os_read_port);
361
362 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
363 {
364         switch (width) {
365         case 8:
366                 outb(value, port);
367                 break;
368         case 16:
369                 outw(value, port);
370                 break;
371         case 32:
372                 outl(value, port);
373                 break;
374         default:
375                 BUG();
376         }
377
378         return AE_OK;
379 }
380
381 EXPORT_SYMBOL(acpi_os_write_port);
382
383 acpi_status
384 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
385 {
386         u32 dummy;
387         void __iomem *virt_addr;
388
389         virt_addr = ioremap(phys_addr, width);
390         if (!value)
391                 value = &dummy;
392
393         switch (width) {
394         case 8:
395                 *(u8 *) value = readb(virt_addr);
396                 break;
397         case 16:
398                 *(u16 *) value = readw(virt_addr);
399                 break;
400         case 32:
401                 *(u32 *) value = readl(virt_addr);
402                 break;
403         default:
404                 BUG();
405         }
406
407         iounmap(virt_addr);
408
409         return AE_OK;
410 }
411
412 acpi_status
413 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
414 {
415         void __iomem *virt_addr;
416
417         virt_addr = ioremap(phys_addr, width);
418
419         switch (width) {
420         case 8:
421                 writeb(value, virt_addr);
422                 break;
423         case 16:
424                 writew(value, virt_addr);
425                 break;
426         case 32:
427                 writel(value, virt_addr);
428                 break;
429         default:
430                 BUG();
431         }
432
433         iounmap(virt_addr);
434
435         return AE_OK;
436 }
437
438 acpi_status
439 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
440                                void *value, u32 width)
441 {
442         int result, size;
443
444         if (!value)
445                 return AE_BAD_PARAMETER;
446
447         switch (width) {
448         case 8:
449                 size = 1;
450                 break;
451         case 16:
452                 size = 2;
453                 break;
454         case 32:
455                 size = 4;
456                 break;
457         default:
458                 return AE_ERROR;
459         }
460
461         BUG_ON(!raw_pci_ops);
462
463         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
464                                    PCI_DEVFN(pci_id->device, pci_id->function),
465                                    reg, size, value);
466
467         return (result ? AE_ERROR : AE_OK);
468 }
469
470 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
471
472 acpi_status
473 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
474                                 acpi_integer value, u32 width)
475 {
476         int result, size;
477
478         switch (width) {
479         case 8:
480                 size = 1;
481                 break;
482         case 16:
483                 size = 2;
484                 break;
485         case 32:
486                 size = 4;
487                 break;
488         default:
489                 return AE_ERROR;
490         }
491
492         BUG_ON(!raw_pci_ops);
493
494         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
495                                     PCI_DEVFN(pci_id->device, pci_id->function),
496                                     reg, size, value);
497
498         return (result ? AE_ERROR : AE_OK);
499 }
500
501 /* TODO: Change code to take advantage of driver model more */
502 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
503                                     acpi_handle chandle,        /* current node */
504                                     struct acpi_pci_id **id,
505                                     int *is_bridge, u8 * bus_number)
506 {
507         acpi_handle handle;
508         struct acpi_pci_id *pci_id = *id;
509         acpi_status status;
510         unsigned long temp;
511         acpi_object_type type;
512         u8 tu8;
513
514         acpi_get_parent(chandle, &handle);
515         if (handle != rhandle) {
516                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
517                                         bus_number);
518
519                 status = acpi_get_type(handle, &type);
520                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
521                         return;
522
523                 status =
524                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
525                                           &temp);
526                 if (ACPI_SUCCESS(status)) {
527                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
528                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
529
530                         if (*is_bridge)
531                                 pci_id->bus = *bus_number;
532
533                         /* any nicer way to get bus number of bridge ? */
534                         status =
535                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
536                                                            8);
537                         if (ACPI_SUCCESS(status)
538                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
539                                 status =
540                                     acpi_os_read_pci_configuration(pci_id, 0x18,
541                                                                    &tu8, 8);
542                                 if (!ACPI_SUCCESS(status)) {
543                                         /* Certainly broken...  FIX ME */
544                                         return;
545                                 }
546                                 *is_bridge = 1;
547                                 pci_id->bus = tu8;
548                                 status =
549                                     acpi_os_read_pci_configuration(pci_id, 0x19,
550                                                                    &tu8, 8);
551                                 if (ACPI_SUCCESS(status)) {
552                                         *bus_number = tu8;
553                                 }
554                         } else
555                                 *is_bridge = 0;
556                 }
557         }
558 }
559
560 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
561                            acpi_handle chandle, /* current node */
562                            struct acpi_pci_id **id)
563 {
564         int is_bridge = 1;
565         u8 bus_number = (*id)->bus;
566
567         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
568 }
569
570 static void acpi_os_execute_deferred(void *context)
571 {
572         struct acpi_os_dpc *dpc = (struct acpi_os_dpc *)context;
573         if (!dpc) {
574                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
575                 return;
576         }
577
578         dpc->function(dpc->context);
579
580         kfree(dpc);
581
582         return;
583 }
584
585 /*******************************************************************************
586  *
587  * FUNCTION:    acpi_os_execute
588  *
589  * PARAMETERS:  Type               - Type of the callback
590  *              Function           - Function to be executed
591  *              Context            - Function parameters
592  *
593  * RETURN:      Status
594  *
595  * DESCRIPTION: Depending on type, either queues function for deferred execution or
596  *              immediately executes function on a separate thread.
597  *
598  ******************************************************************************/
599
600 acpi_status acpi_os_execute(acpi_execute_type type,
601                             acpi_osd_exec_callback function, void *context)
602 {
603         acpi_status status = AE_OK;
604         struct acpi_os_dpc *dpc;
605         struct work_struct *task;
606
607         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
608                           "Scheduling function [%p(%p)] for deferred execution.\n",
609                           function, context));
610
611         if (!function)
612                 return AE_BAD_PARAMETER;
613
614         /*
615          * Allocate/initialize DPC structure.  Note that this memory will be
616          * freed by the callee.  The kernel handles the tq_struct list  in a
617          * way that allows us to also free its memory inside the callee.
618          * Because we may want to schedule several tasks with different
619          * parameters we can't use the approach some kernel code uses of
620          * having a static tq_struct.
621          * We can save time and code by allocating the DPC and tq_structs
622          * from the same memory.
623          */
624
625         dpc = kmalloc(sizeof(struct acpi_os_dpc) +
626                         sizeof(struct work_struct), GFP_ATOMIC);
627         if (!dpc)
628                 return AE_NO_MEMORY;
629         dpc->function = function;
630         dpc->context = context;
631         task = (void *)(dpc + 1);
632         INIT_WORK(task, acpi_os_execute_deferred, (void *)dpc);
633         if (!queue_work((type == OSL_NOTIFY_HANDLER)?
634                         kacpi_notify_wq : kacpid_wq, task)) {
635                 status = AE_ERROR;
636                 kfree(dpc);
637         }
638         return status;
639 }
640
641 EXPORT_SYMBOL(acpi_os_execute);
642
643 void acpi_os_wait_events_complete(void *context)
644 {
645         flush_workqueue(kacpid_wq);
646 }
647
648 EXPORT_SYMBOL(acpi_os_wait_events_complete);
649
650 /*
651  * Allocate the memory for a spinlock and initialize it.
652  */
653 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
654 {
655         spin_lock_init(*handle);
656
657         return AE_OK;
658 }
659
660 /*
661  * Deallocate the memory for a spinlock.
662  */
663 void acpi_os_delete_lock(acpi_spinlock handle)
664 {
665         return;
666 }
667
668 acpi_status
669 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
670 {
671         struct semaphore *sem = NULL;
672
673
674         sem = acpi_os_allocate(sizeof(struct semaphore));
675         if (!sem)
676                 return AE_NO_MEMORY;
677         memset(sem, 0, sizeof(struct semaphore));
678
679         sema_init(sem, initial_units);
680
681         *handle = (acpi_handle *) sem;
682
683         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
684                           *handle, initial_units));
685
686         return AE_OK;
687 }
688
689 EXPORT_SYMBOL(acpi_os_create_semaphore);
690
691 /*
692  * TODO: A better way to delete semaphores?  Linux doesn't have a
693  * 'delete_semaphore()' function -- may result in an invalid
694  * pointer dereference for non-synchronized consumers.  Should
695  * we at least check for blocked threads and signal/cancel them?
696  */
697
698 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
699 {
700         struct semaphore *sem = (struct semaphore *)handle;
701
702
703         if (!sem)
704                 return AE_BAD_PARAMETER;
705
706         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
707
708         kfree(sem);
709         sem = NULL;
710
711         return AE_OK;
712 }
713
714 EXPORT_SYMBOL(acpi_os_delete_semaphore);
715
716 /*
717  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
718  * improvise.  The process is to sleep for one scheduler quantum
719  * until the semaphore becomes available.  Downside is that this
720  * may result in starvation for timeout-based waits when there's
721  * lots of semaphore activity.
722  *
723  * TODO: Support for units > 1?
724  */
725 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
726 {
727         acpi_status status = AE_OK;
728         struct semaphore *sem = (struct semaphore *)handle;
729         int ret = 0;
730
731
732         if (!sem || (units < 1))
733                 return AE_BAD_PARAMETER;
734
735         if (units > 1)
736                 return AE_SUPPORT;
737
738         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
739                           handle, units, timeout));
740
741         /*
742          * This can be called during resume with interrupts off.
743          * Like boot-time, we should be single threaded and will
744          * always get the lock if we try -- timeout or not.
745          * If this doesn't succeed, then we will oops courtesy of
746          * might_sleep() in down().
747          */
748         if (!down_trylock(sem))
749                 return AE_OK;
750
751         switch (timeout) {
752                 /*
753                  * No Wait:
754                  * --------
755                  * A zero timeout value indicates that we shouldn't wait - just
756                  * acquire the semaphore if available otherwise return AE_TIME
757                  * (a.k.a. 'would block').
758                  */
759         case 0:
760                 if (down_trylock(sem))
761                         status = AE_TIME;
762                 break;
763
764                 /*
765                  * Wait Indefinitely:
766                  * ------------------
767                  */
768         case ACPI_WAIT_FOREVER:
769                 down(sem);
770                 break;
771
772                 /*
773                  * Wait w/ Timeout:
774                  * ----------------
775                  */
776         default:
777                 // TODO: A better timeout algorithm?
778                 {
779                         int i = 0;
780                         static const int quantum_ms = 1000 / HZ;
781
782                         ret = down_trylock(sem);
783                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
784                                 schedule_timeout_interruptible(1);
785                                 ret = down_trylock(sem);
786                         }
787
788                         if (ret != 0)
789                                 status = AE_TIME;
790                 }
791                 break;
792         }
793
794         if (ACPI_FAILURE(status)) {
795                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
796                                   "Failed to acquire semaphore[%p|%d|%d], %s",
797                                   handle, units, timeout,
798                                   acpi_format_exception(status)));
799         } else {
800                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
801                                   "Acquired semaphore[%p|%d|%d]", handle,
802                                   units, timeout));
803         }
804
805         return status;
806 }
807
808 EXPORT_SYMBOL(acpi_os_wait_semaphore);
809
810 /*
811  * TODO: Support for units > 1?
812  */
813 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
814 {
815         struct semaphore *sem = (struct semaphore *)handle;
816
817
818         if (!sem || (units < 1))
819                 return AE_BAD_PARAMETER;
820
821         if (units > 1)
822                 return AE_SUPPORT;
823
824         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
825                           units));
826
827         up(sem);
828
829         return AE_OK;
830 }
831
832 EXPORT_SYMBOL(acpi_os_signal_semaphore);
833
834 #ifdef ACPI_FUTURE_USAGE
835 u32 acpi_os_get_line(char *buffer)
836 {
837
838 #ifdef ENABLE_DEBUGGER
839         if (acpi_in_debugger) {
840                 u32 chars;
841
842                 kdb_read(buffer, sizeof(line_buf));
843
844                 /* remove the CR kdb includes */
845                 chars = strlen(buffer) - 1;
846                 buffer[chars] = '\0';
847         }
848 #endif
849
850         return 0;
851 }
852 #endif                          /*  ACPI_FUTURE_USAGE  */
853
854 /* Assumes no unreadable holes inbetween */
855 u8 acpi_os_readable(void *ptr, acpi_size len)
856 {
857 #if defined(__i386__) || defined(__x86_64__)
858         char tmp;
859         return !__get_user(tmp, (char __user *)ptr)
860             && !__get_user(tmp, (char __user *)ptr + len - 1);
861 #endif
862         return 1;
863 }
864
865 #ifdef ACPI_FUTURE_USAGE
866 u8 acpi_os_writable(void *ptr, acpi_size len)
867 {
868         /* could do dummy write (racy) or a kernel page table lookup.
869            The later may be difficult at early boot when kmap doesn't work yet. */
870         return 1;
871 }
872 #endif
873
874 acpi_status acpi_os_signal(u32 function, void *info)
875 {
876         switch (function) {
877         case ACPI_SIGNAL_FATAL:
878                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
879                 break;
880         case ACPI_SIGNAL_BREAKPOINT:
881                 /*
882                  * AML Breakpoint
883                  * ACPI spec. says to treat it as a NOP unless
884                  * you are debugging.  So if/when we integrate
885                  * AML debugger into the kernel debugger its
886                  * hook will go here.  But until then it is
887                  * not useful to print anything on breakpoints.
888                  */
889                 break;
890         default:
891                 break;
892         }
893
894         return AE_OK;
895 }
896
897 EXPORT_SYMBOL(acpi_os_signal);
898
899 static int __init acpi_os_name_setup(char *str)
900 {
901         char *p = acpi_os_name;
902         int count = ACPI_MAX_OVERRIDE_LEN - 1;
903
904         if (!str || !*str)
905                 return 0;
906
907         for (; count-- && str && *str; str++) {
908                 if (isalnum(*str) || *str == ' ' || *str == ':')
909                         *p++ = *str;
910                 else if (*str == '\'' || *str == '"')
911                         continue;
912                 else
913                         break;
914         }
915         *p = 0;
916
917         return 1;
918
919 }
920
921 __setup("acpi_os_name=", acpi_os_name_setup);
922
923 /*
924  * _OSI control
925  * empty string disables _OSI
926  * TBD additional string adds to _OSI
927  */
928 static int __init acpi_osi_setup(char *str)
929 {
930         if (str == NULL || *str == '\0') {
931                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
932                 acpi_gbl_create_osi_method = FALSE;
933         } else {
934                 /* TBD */
935                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
936                        str);
937         }
938
939         return 1;
940 }
941
942 __setup("acpi_osi=", acpi_osi_setup);
943
944 /* enable serialization to combat AE_ALREADY_EXISTS errors */
945 static int __init acpi_serialize_setup(char *str)
946 {
947         printk(KERN_INFO PREFIX "serialize enabled\n");
948
949         acpi_gbl_all_methods_serialized = TRUE;
950
951         return 1;
952 }
953
954 __setup("acpi_serialize", acpi_serialize_setup);
955
956 /*
957  * Wake and Run-Time GPES are expected to be separate.
958  * We disable wake-GPEs at run-time to prevent spurious
959  * interrupts.
960  *
961  * However, if a system exists that shares Wake and
962  * Run-time events on the same GPE this flag is available
963  * to tell Linux to keep the wake-time GPEs enabled at run-time.
964  */
965 static int __init acpi_wake_gpes_always_on_setup(char *str)
966 {
967         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
968
969         acpi_gbl_leave_wake_gpes_disabled = FALSE;
970
971         return 1;
972 }
973
974 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
975
976 static int __init acpi_hotkey_setup(char *str)
977 {
978         acpi_specific_hotkey_enabled = FALSE;
979         return 1;
980 }
981
982 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
983
984 /*
985  * max_cstate is defined in the base kernel so modules can
986  * change it w/o depending on the state of the processor module.
987  */
988 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
989
990 EXPORT_SYMBOL(max_cstate);
991
992 /*
993  * Acquire a spinlock.
994  *
995  * handle is a pointer to the spinlock_t.
996  */
997
998 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
999 {
1000         acpi_cpu_flags flags;
1001         spin_lock_irqsave(lockp, flags);
1002         return flags;
1003 }
1004
1005 /*
1006  * Release a spinlock. See above.
1007  */
1008
1009 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1010 {
1011         spin_unlock_irqrestore(lockp, flags);
1012 }
1013
1014 #ifndef ACPI_USE_LOCAL_CACHE
1015
1016 /*******************************************************************************
1017  *
1018  * FUNCTION:    acpi_os_create_cache
1019  *
1020  * PARAMETERS:  name      - Ascii name for the cache
1021  *              size      - Size of each cached object
1022  *              depth     - Maximum depth of the cache (in objects) <ignored>
1023  *              cache     - Where the new cache object is returned
1024  *
1025  * RETURN:      status
1026  *
1027  * DESCRIPTION: Create a cache object
1028  *
1029  ******************************************************************************/
1030
1031 acpi_status
1032 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1033 {
1034         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1035         if (cache == NULL)
1036                 return AE_ERROR;
1037         else
1038                 return AE_OK;
1039 }
1040
1041 /*******************************************************************************
1042  *
1043  * FUNCTION:    acpi_os_purge_cache
1044  *
1045  * PARAMETERS:  Cache           - Handle to cache object
1046  *
1047  * RETURN:      Status
1048  *
1049  * DESCRIPTION: Free all objects within the requested cache.
1050  *
1051  ******************************************************************************/
1052
1053 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1054 {
1055         (void)kmem_cache_shrink(cache);
1056         return (AE_OK);
1057 }
1058
1059 /*******************************************************************************
1060  *
1061  * FUNCTION:    acpi_os_delete_cache
1062  *
1063  * PARAMETERS:  Cache           - Handle to cache object
1064  *
1065  * RETURN:      Status
1066  *
1067  * DESCRIPTION: Free all objects within the requested cache and delete the
1068  *              cache object.
1069  *
1070  ******************************************************************************/
1071
1072 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1073 {
1074         kmem_cache_destroy(cache);
1075         return (AE_OK);
1076 }
1077
1078 /*******************************************************************************
1079  *
1080  * FUNCTION:    acpi_os_release_object
1081  *
1082  * PARAMETERS:  Cache       - Handle to cache object
1083  *              Object      - The object to be released
1084  *
1085  * RETURN:      None
1086  *
1087  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1088  *              the object is deleted.
1089  *
1090  ******************************************************************************/
1091
1092 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1093 {
1094         kmem_cache_free(cache, object);
1095         return (AE_OK);
1096 }
1097
1098 /******************************************************************************
1099  *
1100  * FUNCTION:    acpi_os_validate_interface
1101  *
1102  * PARAMETERS:  interface           - Requested interface to be validated
1103  *
1104  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1105  *
1106  * DESCRIPTION: Match an interface string to the interfaces supported by the
1107  *              host. Strings originate from an AML call to the _OSI method.
1108  *
1109  *****************************************************************************/
1110
1111 acpi_status
1112 acpi_os_validate_interface (char *interface)
1113 {
1114
1115     return AE_SUPPORT;
1116 }
1117
1118
1119 /******************************************************************************
1120  *
1121  * FUNCTION:    acpi_os_validate_address
1122  *
1123  * PARAMETERS:  space_id             - ACPI space ID
1124  *              address             - Physical address
1125  *              length              - Address length
1126  *
1127  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1128  *              should return AE_AML_ILLEGAL_ADDRESS.
1129  *
1130  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1131  *              the addresses accessed by AML operation regions.
1132  *
1133  *****************************************************************************/
1134
1135 acpi_status
1136 acpi_os_validate_address (
1137     u8                   space_id,
1138     acpi_physical_address   address,
1139     acpi_size               length)
1140 {
1141
1142     return AE_OK;
1143 }
1144
1145
1146 #endif