Pull bugfix into test branch
[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
572         if (!dpc) {
573                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
574                 return;
575         }
576
577         dpc->function(dpc->context);
578
579         kfree(dpc);
580
581         return;
582 }
583
584 /*******************************************************************************
585  *
586  * FUNCTION:    acpi_os_execute
587  *
588  * PARAMETERS:  Type               - Type of the callback
589  *              Function           - Function to be executed
590  *              Context            - Function parameters
591  *
592  * RETURN:      Status
593  *
594  * DESCRIPTION: Depending on type, either queues function for deferred execution or
595  *              immediately executes function on a separate thread.
596  *
597  ******************************************************************************/
598
599 acpi_status acpi_os_execute(acpi_execute_type type,
600                             acpi_osd_exec_callback function, void *context)
601 {
602         acpi_status status = AE_OK;
603         struct acpi_os_dpc *dpc;
604
605         ACPI_FUNCTION_TRACE("os_queue_for_execution");
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_ACPI_STATUS(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 work_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 work_struct.
621          */
622
623         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
624         if (!dpc)
625                 return_ACPI_STATUS(AE_NO_MEMORY);
626
627         dpc->function = function;
628         dpc->context = context;
629
630         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
631         if (!queue_work(kacpid_wq, &dpc->work)) {
632                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
633                                   "Call to queue_work() failed.\n"));
634                 kfree(dpc);
635                 status = AE_ERROR;
636         }
637
638         return_ACPI_STATUS(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         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