Pull kmalloc into release branch
[pandora-kernel.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 <linux/kthread.h>
40 #include <acpi/acpi.h>
41 #include <asm/io.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/processor.h>
44 #include <asm/uaccess.h>
45
46 #include <linux/efi.h>
47
48 #define _COMPONENT              ACPI_OS_SERVICES
49 ACPI_MODULE_NAME("osl")
50 #define PREFIX          "ACPI: "
51 struct acpi_os_dpc {
52         acpi_osd_exec_callback function;
53         void *context;
54 };
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
140 extern int acpi_in_resume;
141 void *acpi_os_allocate(acpi_size size)
142 {
143         if (acpi_in_resume)
144                 return kmalloc(size, GFP_ATOMIC);
145         else
146                 return kmalloc(size, GFP_KERNEL);
147 }
148
149 acpi_status acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
150 {
151         if (efi_enabled) {
152                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
153                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
154                         addr->pointer.physical = efi.acpi20;
155                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
156                         addr->pointer.physical = efi.acpi;
157                 else {
158                         printk(KERN_ERR PREFIX
159                                "System description tables not found\n");
160                         return AE_NOT_FOUND;
161                 }
162         } else {
163                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
164                         printk(KERN_ERR PREFIX
165                                "System description tables not found\n");
166                         return AE_NOT_FOUND;
167                 }
168         }
169
170         return AE_OK;
171 }
172
173 acpi_status
174 acpi_os_map_memory(acpi_physical_address phys, acpi_size size,
175                    void __iomem ** virt)
176 {
177         if (phys > ULONG_MAX) {
178                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
179                 return AE_BAD_PARAMETER;
180         }
181         /*
182          * ioremap checks to ensure this is in reserved space
183          */
184         *virt = ioremap((unsigned long)phys, size);
185
186         if (!*virt)
187                 return AE_NO_MEMORY;
188
189         return AE_OK;
190 }
191 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
192
193 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
194 {
195         iounmap(virt);
196 }
197 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
198
199 #ifdef ACPI_FUTURE_USAGE
200 acpi_status
201 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
202 {
203         if (!phys || !virt)
204                 return AE_BAD_PARAMETER;
205
206         *phys = virt_to_phys(virt);
207
208         return AE_OK;
209 }
210 #endif
211
212 #define ACPI_MAX_OVERRIDE_LEN 100
213
214 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
215
216 acpi_status
217 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
218                             acpi_string * new_val)
219 {
220         if (!init_val || !new_val)
221                 return AE_BAD_PARAMETER;
222
223         *new_val = NULL;
224         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
225                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
226                        acpi_os_name);
227                 *new_val = acpi_os_name;
228         }
229
230         return AE_OK;
231 }
232
233 acpi_status
234 acpi_os_table_override(struct acpi_table_header * existing_table,
235                        struct acpi_table_header ** new_table)
236 {
237         if (!existing_table || !new_table)
238                 return AE_BAD_PARAMETER;
239
240 #ifdef CONFIG_ACPI_CUSTOM_DSDT
241         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
242                 *new_table = (struct acpi_table_header *)AmlCode;
243         else
244                 *new_table = NULL;
245 #else
246         *new_table = NULL;
247 #endif
248         return AE_OK;
249 }
250
251 static irqreturn_t acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
252 {
253         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
254 }
255
256 acpi_status
257 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
258                                   void *context)
259 {
260         unsigned int irq;
261
262         /*
263          * Ignore the GSI from the core, and use the value in our copy of the
264          * FADT. It may not be the same if an interrupt source override exists
265          * for the SCI.
266          */
267         gsi = acpi_fadt.sci_int;
268         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
269                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
270                        gsi);
271                 return AE_OK;
272         }
273
274         acpi_irq_handler = handler;
275         acpi_irq_context = context;
276         if (request_irq(irq, acpi_irq, SA_SHIRQ, "acpi", acpi_irq)) {
277                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
278                 return AE_NOT_ACQUIRED;
279         }
280         acpi_irq_irq = irq;
281
282         return AE_OK;
283 }
284
285 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
286 {
287         if (irq) {
288                 free_irq(irq, acpi_irq);
289                 acpi_irq_handler = NULL;
290                 acpi_irq_irq = 0;
291         }
292
293         return AE_OK;
294 }
295
296 /*
297  * Running in interpreter thread context, safe to sleep
298  */
299
300 void acpi_os_sleep(acpi_integer ms)
301 {
302         schedule_timeout_interruptible(msecs_to_jiffies(ms));
303 }
304
305 EXPORT_SYMBOL(acpi_os_sleep);
306
307 void acpi_os_stall(u32 us)
308 {
309         while (us) {
310                 u32 delay = 1000;
311
312                 if (delay > us)
313                         delay = us;
314                 udelay(delay);
315                 touch_nmi_watchdog();
316                 us -= delay;
317         }
318 }
319
320 EXPORT_SYMBOL(acpi_os_stall);
321
322 /*
323  * Support ACPI 3.0 AML Timer operand
324  * Returns 64-bit free-running, monotonically increasing timer
325  * with 100ns granularity
326  */
327 u64 acpi_os_get_timer(void)
328 {
329         static u64 t;
330
331 #ifdef  CONFIG_HPET
332         /* TBD: use HPET if available */
333 #endif
334
335 #ifdef  CONFIG_X86_PM_TIMER
336         /* TBD: default to PM timer if HPET was not available */
337 #endif
338         if (!t)
339                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
340
341         return ++t;
342 }
343
344 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
345 {
346         u32 dummy;
347
348         if (!value)
349                 value = &dummy;
350
351         switch (width) {
352         case 8:
353                 *(u8 *) value = inb(port);
354                 break;
355         case 16:
356                 *(u16 *) value = inw(port);
357                 break;
358         case 32:
359                 *(u32 *) value = inl(port);
360                 break;
361         default:
362                 BUG();
363         }
364
365         return AE_OK;
366 }
367
368 EXPORT_SYMBOL(acpi_os_read_port);
369
370 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
371 {
372         switch (width) {
373         case 8:
374                 outb(value, port);
375                 break;
376         case 16:
377                 outw(value, port);
378                 break;
379         case 32:
380                 outl(value, port);
381                 break;
382         default:
383                 BUG();
384         }
385
386         return AE_OK;
387 }
388
389 EXPORT_SYMBOL(acpi_os_write_port);
390
391 acpi_status
392 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
393 {
394         u32 dummy;
395         void __iomem *virt_addr;
396
397         virt_addr = ioremap(phys_addr, width);
398         if (!value)
399                 value = &dummy;
400
401         switch (width) {
402         case 8:
403                 *(u8 *) value = readb(virt_addr);
404                 break;
405         case 16:
406                 *(u16 *) value = readw(virt_addr);
407                 break;
408         case 32:
409                 *(u32 *) value = readl(virt_addr);
410                 break;
411         default:
412                 BUG();
413         }
414
415         iounmap(virt_addr);
416
417         return AE_OK;
418 }
419
420 acpi_status
421 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
422 {
423         void __iomem *virt_addr;
424
425         virt_addr = ioremap(phys_addr, width);
426
427         switch (width) {
428         case 8:
429                 writeb(value, virt_addr);
430                 break;
431         case 16:
432                 writew(value, virt_addr);
433                 break;
434         case 32:
435                 writel(value, virt_addr);
436                 break;
437         default:
438                 BUG();
439         }
440
441         iounmap(virt_addr);
442
443         return AE_OK;
444 }
445
446 acpi_status
447 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
448                                void *value, u32 width)
449 {
450         int result, size;
451
452         if (!value)
453                 return AE_BAD_PARAMETER;
454
455         switch (width) {
456         case 8:
457                 size = 1;
458                 break;
459         case 16:
460                 size = 2;
461                 break;
462         case 32:
463                 size = 4;
464                 break;
465         default:
466                 return AE_ERROR;
467         }
468
469         BUG_ON(!raw_pci_ops);
470
471         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
472                                    PCI_DEVFN(pci_id->device, pci_id->function),
473                                    reg, size, value);
474
475         return (result ? AE_ERROR : AE_OK);
476 }
477
478 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
479
480 acpi_status
481 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
482                                 acpi_integer value, u32 width)
483 {
484         int result, size;
485
486         switch (width) {
487         case 8:
488                 size = 1;
489                 break;
490         case 16:
491                 size = 2;
492                 break;
493         case 32:
494                 size = 4;
495                 break;
496         default:
497                 return AE_ERROR;
498         }
499
500         BUG_ON(!raw_pci_ops);
501
502         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
503                                     PCI_DEVFN(pci_id->device, pci_id->function),
504                                     reg, size, value);
505
506         return (result ? AE_ERROR : AE_OK);
507 }
508
509 /* TODO: Change code to take advantage of driver model more */
510 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
511                                     acpi_handle chandle,        /* current node */
512                                     struct acpi_pci_id **id,
513                                     int *is_bridge, u8 * bus_number)
514 {
515         acpi_handle handle;
516         struct acpi_pci_id *pci_id = *id;
517         acpi_status status;
518         unsigned long temp;
519         acpi_object_type type;
520         u8 tu8;
521
522         acpi_get_parent(chandle, &handle);
523         if (handle != rhandle) {
524                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
525                                         bus_number);
526
527                 status = acpi_get_type(handle, &type);
528                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
529                         return;
530
531                 status =
532                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
533                                           &temp);
534                 if (ACPI_SUCCESS(status)) {
535                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
536                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
537
538                         if (*is_bridge)
539                                 pci_id->bus = *bus_number;
540
541                         /* any nicer way to get bus number of bridge ? */
542                         status =
543                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
544                                                            8);
545                         if (ACPI_SUCCESS(status)
546                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
547                                 status =
548                                     acpi_os_read_pci_configuration(pci_id, 0x18,
549                                                                    &tu8, 8);
550                                 if (!ACPI_SUCCESS(status)) {
551                                         /* Certainly broken...  FIX ME */
552                                         return;
553                                 }
554                                 *is_bridge = 1;
555                                 pci_id->bus = tu8;
556                                 status =
557                                     acpi_os_read_pci_configuration(pci_id, 0x19,
558                                                                    &tu8, 8);
559                                 if (ACPI_SUCCESS(status)) {
560                                         *bus_number = tu8;
561                                 }
562                         } else
563                                 *is_bridge = 0;
564                 }
565         }
566 }
567
568 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
569                            acpi_handle chandle, /* current node */
570                            struct acpi_pci_id **id)
571 {
572         int is_bridge = 1;
573         u8 bus_number = (*id)->bus;
574
575         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
576 }
577
578 static void acpi_os_execute_deferred(void *context)
579 {
580         struct acpi_os_dpc *dpc = NULL;
581
582
583         dpc = (struct acpi_os_dpc *)context;
584         if (!dpc) {
585                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
586                 return;
587         }
588
589         dpc->function(dpc->context);
590
591         kfree(dpc);
592
593         return;
594 }
595
596 static int acpi_os_execute_thread(void *context)
597 {
598         struct acpi_os_dpc *dpc = (struct acpi_os_dpc *)context;
599         if (dpc) {
600                 dpc->function(dpc->context);
601                 kfree(dpc);
602         }
603         do_exit(0);
604 }
605
606 /*******************************************************************************
607  *
608  * FUNCTION:    acpi_os_execute
609  *
610  * PARAMETERS:  Type               - Type of the callback
611  *              Function           - Function to be executed
612  *              Context            - Function parameters
613  *
614  * RETURN:      Status
615  *
616  * DESCRIPTION: Depending on type, either queues function for deferred execution or
617  *              immediately executes function on a separate thread.
618  *
619  ******************************************************************************/
620
621 acpi_status acpi_os_execute(acpi_execute_type type,
622                             acpi_osd_exec_callback function, void *context)
623 {
624         acpi_status status = AE_OK;
625         struct acpi_os_dpc *dpc;
626         struct work_struct *task;
627         struct task_struct *p;
628
629         if (!function)
630                 return AE_BAD_PARAMETER;
631         /*
632          * Allocate/initialize DPC structure.  Note that this memory will be
633          * freed by the callee.  The kernel handles the tq_struct list  in a
634          * way that allows us to also free its memory inside the callee.
635          * Because we may want to schedule several tasks with different
636          * parameters we can't use the approach some kernel code uses of
637          * having a static tq_struct.
638          * We can save time and code by allocating the DPC and tq_structs
639          * from the same memory.
640          */
641         if (type == OSL_NOTIFY_HANDLER) {
642                 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_KERNEL);
643         } else {
644                 dpc = kmalloc(sizeof(struct acpi_os_dpc) +
645                                 sizeof(struct work_struct), GFP_ATOMIC);
646         }
647         if (!dpc)
648                 return AE_NO_MEMORY;
649         dpc->function = function;
650         dpc->context = context;
651
652         if (type == OSL_NOTIFY_HANDLER) {
653                 p = kthread_create(acpi_os_execute_thread, dpc, "kacpid_notify");
654                 if (!IS_ERR(p)) {
655                         wake_up_process(p);
656                 } else {
657                         status = AE_NO_MEMORY;
658                         kfree(dpc);
659                 }
660         } else {
661                 task = (void *)(dpc + 1);
662                 INIT_WORK(task, acpi_os_execute_deferred, (void *)dpc);
663                 if (!queue_work(kacpid_wq, task)) {
664                         status = AE_ERROR;
665                         kfree(dpc);
666                 }
667         }
668         return status;
669 }
670
671 EXPORT_SYMBOL(acpi_os_execute);
672
673 void acpi_os_wait_events_complete(void *context)
674 {
675         flush_workqueue(kacpid_wq);
676 }
677
678 EXPORT_SYMBOL(acpi_os_wait_events_complete);
679
680 /*
681  * Allocate the memory for a spinlock and initialize it.
682  */
683 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
684 {
685         spin_lock_init(*handle);
686
687         return AE_OK;
688 }
689
690 /*
691  * Deallocate the memory for a spinlock.
692  */
693 void acpi_os_delete_lock(acpi_spinlock handle)
694 {
695         return;
696 }
697
698 acpi_status
699 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
700 {
701         struct semaphore *sem = NULL;
702
703
704         sem = acpi_os_allocate(sizeof(struct semaphore));
705         if (!sem)
706                 return AE_NO_MEMORY;
707         memset(sem, 0, sizeof(struct semaphore));
708
709         sema_init(sem, initial_units);
710
711         *handle = (acpi_handle *) sem;
712
713         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
714                           *handle, initial_units));
715
716         return AE_OK;
717 }
718
719 EXPORT_SYMBOL(acpi_os_create_semaphore);
720
721 /*
722  * TODO: A better way to delete semaphores?  Linux doesn't have a
723  * 'delete_semaphore()' function -- may result in an invalid
724  * pointer dereference for non-synchronized consumers.  Should
725  * we at least check for blocked threads and signal/cancel them?
726  */
727
728 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
729 {
730         struct semaphore *sem = (struct semaphore *)handle;
731
732
733         if (!sem)
734                 return AE_BAD_PARAMETER;
735
736         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
737
738         kfree(sem);
739         sem = NULL;
740
741         return AE_OK;
742 }
743
744 EXPORT_SYMBOL(acpi_os_delete_semaphore);
745
746 /*
747  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
748  * improvise.  The process is to sleep for one scheduler quantum
749  * until the semaphore becomes available.  Downside is that this
750  * may result in starvation for timeout-based waits when there's
751  * lots of semaphore activity.
752  *
753  * TODO: Support for units > 1?
754  */
755 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
756 {
757         acpi_status status = AE_OK;
758         struct semaphore *sem = (struct semaphore *)handle;
759         int ret = 0;
760
761
762         if (!sem || (units < 1))
763                 return AE_BAD_PARAMETER;
764
765         if (units > 1)
766                 return AE_SUPPORT;
767
768         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
769                           handle, units, timeout));
770
771         switch (timeout) {
772                 /*
773                  * No Wait:
774                  * --------
775                  * A zero timeout value indicates that we shouldn't wait - just
776                  * acquire the semaphore if available otherwise return AE_TIME
777                  * (a.k.a. 'would block').
778                  */
779         case 0:
780                 if (down_trylock(sem))
781                         status = AE_TIME;
782                 break;
783
784                 /*
785                  * Wait Indefinitely:
786                  * ------------------
787                  */
788         case ACPI_WAIT_FOREVER:
789                 down(sem);
790                 break;
791
792                 /*
793                  * Wait w/ Timeout:
794                  * ----------------
795                  */
796         default:
797                 // TODO: A better timeout algorithm?
798                 {
799                         int i = 0;
800                         static const int quantum_ms = 1000 / HZ;
801
802                         ret = down_trylock(sem);
803                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
804                                 schedule_timeout_interruptible(1);
805                                 ret = down_trylock(sem);
806                         }
807
808                         if (ret != 0)
809                                 status = AE_TIME;
810                 }
811                 break;
812         }
813
814         if (ACPI_FAILURE(status)) {
815                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
816                                   "Failed to acquire semaphore[%p|%d|%d], %s",
817                                   handle, units, timeout,
818                                   acpi_format_exception(status)));
819         } else {
820                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
821                                   "Acquired semaphore[%p|%d|%d]", handle,
822                                   units, timeout));
823         }
824
825         return status;
826 }
827
828 EXPORT_SYMBOL(acpi_os_wait_semaphore);
829
830 /*
831  * TODO: Support for units > 1?
832  */
833 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
834 {
835         struct semaphore *sem = (struct semaphore *)handle;
836
837
838         if (!sem || (units < 1))
839                 return AE_BAD_PARAMETER;
840
841         if (units > 1)
842                 return AE_SUPPORT;
843
844         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
845                           units));
846
847         up(sem);
848
849         return AE_OK;
850 }
851
852 EXPORT_SYMBOL(acpi_os_signal_semaphore);
853
854 #ifdef ACPI_FUTURE_USAGE
855 u32 acpi_os_get_line(char *buffer)
856 {
857
858 #ifdef ENABLE_DEBUGGER
859         if (acpi_in_debugger) {
860                 u32 chars;
861
862                 kdb_read(buffer, sizeof(line_buf));
863
864                 /* remove the CR kdb includes */
865                 chars = strlen(buffer) - 1;
866                 buffer[chars] = '\0';
867         }
868 #endif
869
870         return 0;
871 }
872 #endif                          /*  ACPI_FUTURE_USAGE  */
873
874 /* Assumes no unreadable holes inbetween */
875 u8 acpi_os_readable(void *ptr, acpi_size len)
876 {
877 #if defined(__i386__) || defined(__x86_64__)
878         char tmp;
879         return !__get_user(tmp, (char __user *)ptr)
880             && !__get_user(tmp, (char __user *)ptr + len - 1);
881 #endif
882         return 1;
883 }
884
885 #ifdef ACPI_FUTURE_USAGE
886 u8 acpi_os_writable(void *ptr, acpi_size len)
887 {
888         /* could do dummy write (racy) or a kernel page table lookup.
889            The later may be difficult at early boot when kmap doesn't work yet. */
890         return 1;
891 }
892 #endif
893
894 acpi_status acpi_os_signal(u32 function, void *info)
895 {
896         switch (function) {
897         case ACPI_SIGNAL_FATAL:
898                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
899                 break;
900         case ACPI_SIGNAL_BREAKPOINT:
901                 /*
902                  * AML Breakpoint
903                  * ACPI spec. says to treat it as a NOP unless
904                  * you are debugging.  So if/when we integrate
905                  * AML debugger into the kernel debugger its
906                  * hook will go here.  But until then it is
907                  * not useful to print anything on breakpoints.
908                  */
909                 break;
910         default:
911                 break;
912         }
913
914         return AE_OK;
915 }
916
917 EXPORT_SYMBOL(acpi_os_signal);
918
919 static int __init acpi_os_name_setup(char *str)
920 {
921         char *p = acpi_os_name;
922         int count = ACPI_MAX_OVERRIDE_LEN - 1;
923
924         if (!str || !*str)
925                 return 0;
926
927         for (; count-- && str && *str; str++) {
928                 if (isalnum(*str) || *str == ' ' || *str == ':')
929                         *p++ = *str;
930                 else if (*str == '\'' || *str == '"')
931                         continue;
932                 else
933                         break;
934         }
935         *p = 0;
936
937         return 1;
938
939 }
940
941 __setup("acpi_os_name=", acpi_os_name_setup);
942
943 /*
944  * _OSI control
945  * empty string disables _OSI
946  * TBD additional string adds to _OSI
947  */
948 static int __init acpi_osi_setup(char *str)
949 {
950         if (str == NULL || *str == '\0') {
951                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
952                 acpi_gbl_create_osi_method = FALSE;
953         } else {
954                 /* TBD */
955                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
956                        str);
957         }
958
959         return 1;
960 }
961
962 __setup("acpi_osi=", acpi_osi_setup);
963
964 /* enable serialization to combat AE_ALREADY_EXISTS errors */
965 static int __init acpi_serialize_setup(char *str)
966 {
967         printk(KERN_INFO PREFIX "serialize enabled\n");
968
969         acpi_gbl_all_methods_serialized = TRUE;
970
971         return 1;
972 }
973
974 __setup("acpi_serialize", acpi_serialize_setup);
975
976 /*
977  * Wake and Run-Time GPES are expected to be separate.
978  * We disable wake-GPEs at run-time to prevent spurious
979  * interrupts.
980  *
981  * However, if a system exists that shares Wake and
982  * Run-time events on the same GPE this flag is available
983  * to tell Linux to keep the wake-time GPEs enabled at run-time.
984  */
985 static int __init acpi_wake_gpes_always_on_setup(char *str)
986 {
987         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
988
989         acpi_gbl_leave_wake_gpes_disabled = FALSE;
990
991         return 1;
992 }
993
994 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
995
996 static int __init acpi_hotkey_setup(char *str)
997 {
998         acpi_specific_hotkey_enabled = FALSE;
999         return 1;
1000 }
1001
1002 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
1003
1004 /*
1005  * max_cstate is defined in the base kernel so modules can
1006  * change it w/o depending on the state of the processor module.
1007  */
1008 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1009
1010 EXPORT_SYMBOL(max_cstate);
1011
1012 /*
1013  * Acquire a spinlock.
1014  *
1015  * handle is a pointer to the spinlock_t.
1016  */
1017
1018 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1019 {
1020         acpi_cpu_flags flags;
1021         spin_lock_irqsave(lockp, flags);
1022         return flags;
1023 }
1024
1025 /*
1026  * Release a spinlock. See above.
1027  */
1028
1029 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1030 {
1031         spin_unlock_irqrestore(lockp, flags);
1032 }
1033
1034 #ifndef ACPI_USE_LOCAL_CACHE
1035
1036 /*******************************************************************************
1037  *
1038  * FUNCTION:    acpi_os_create_cache
1039  *
1040  * PARAMETERS:  name      - Ascii name for the cache
1041  *              size      - Size of each cached object
1042  *              depth     - Maximum depth of the cache (in objects) <ignored>
1043  *              cache     - Where the new cache object is returned
1044  *
1045  * RETURN:      status
1046  *
1047  * DESCRIPTION: Create a cache object
1048  *
1049  ******************************************************************************/
1050
1051 acpi_status
1052 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1053 {
1054         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1055         if (cache == NULL)
1056                 return AE_ERROR;
1057         else
1058                 return AE_OK;
1059 }
1060
1061 /*******************************************************************************
1062  *
1063  * FUNCTION:    acpi_os_purge_cache
1064  *
1065  * PARAMETERS:  Cache           - Handle to cache object
1066  *
1067  * RETURN:      Status
1068  *
1069  * DESCRIPTION: Free all objects within the requested cache.
1070  *
1071  ******************************************************************************/
1072
1073 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1074 {
1075         (void)kmem_cache_shrink(cache);
1076         return (AE_OK);
1077 }
1078
1079 /*******************************************************************************
1080  *
1081  * FUNCTION:    acpi_os_delete_cache
1082  *
1083  * PARAMETERS:  Cache           - Handle to cache object
1084  *
1085  * RETURN:      Status
1086  *
1087  * DESCRIPTION: Free all objects within the requested cache and delete the
1088  *              cache object.
1089  *
1090  ******************************************************************************/
1091
1092 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1093 {
1094         (void)kmem_cache_destroy(cache);
1095         return (AE_OK);
1096 }
1097
1098 /*******************************************************************************
1099  *
1100  * FUNCTION:    acpi_os_release_object
1101  *
1102  * PARAMETERS:  Cache       - Handle to cache object
1103  *              Object      - The object to be released
1104  *
1105  * RETURN:      None
1106  *
1107  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1108  *              the object is deleted.
1109  *
1110  ******************************************************************************/
1111
1112 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1113 {
1114         kmem_cache_free(cache, object);
1115         return (AE_OK);
1116 }
1117
1118 /*******************************************************************************
1119  *
1120  * FUNCTION:    acpi_os_acquire_object
1121  *
1122  * PARAMETERS:  Cache           - Handle to cache object
1123  *              ReturnObject    - Where the object is returned
1124  *
1125  * RETURN:      Status
1126  *
1127  * DESCRIPTION: Return a zero-filled object.
1128  *
1129  ******************************************************************************/
1130
1131 void *acpi_os_acquire_object(acpi_cache_t * cache)
1132 {
1133         void *object = kmem_cache_zalloc(cache, GFP_KERNEL);
1134         WARN_ON(!object);
1135         return object;
1136 }
1137
1138 /******************************************************************************
1139  *
1140  * FUNCTION:    acpi_os_validate_interface
1141  *
1142  * PARAMETERS:  interface           - Requested interface to be validated
1143  *
1144  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1145  *
1146  * DESCRIPTION: Match an interface string to the interfaces supported by the
1147  *              host. Strings originate from an AML call to the _OSI method.
1148  *
1149  *****************************************************************************/
1150
1151 acpi_status
1152 acpi_os_validate_interface (char *interface)
1153 {
1154
1155     return AE_SUPPORT;
1156 }
1157
1158
1159 /******************************************************************************
1160  *
1161  * FUNCTION:    acpi_os_validate_address
1162  *
1163  * PARAMETERS:  space_id             - ACPI space ID
1164  *              address             - Physical address
1165  *              length              - Address length
1166  *
1167  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1168  *              should return AE_AML_ILLEGAL_ADDRESS.
1169  *
1170  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1171  *              the addresses accessed by AML operation regions.
1172  *
1173  *****************************************************************************/
1174
1175 acpi_status
1176 acpi_os_validate_address (
1177     u8                   space_id,
1178     acpi_physical_address   address,
1179     acpi_size               length)
1180 {
1181
1182     return AE_OK;
1183 }
1184
1185
1186 #endif