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