]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/acpi/osl.c
/home/lenb/src/to-akpm branch 'acpi-2.6.12'
[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/config.h>
29 #include <linux/module.h>
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/mm.h>
33 #include <linux/pci.h>
34 #include <linux/smp_lock.h>
35 #include <linux/interrupt.h>
36 #include <linux/kmod.h>
37 #include <linux/delay.h>
38 #include <linux/workqueue.h>
39 #include <linux/nmi.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
49 #define _COMPONENT              ACPI_OS_SERVICES
50 ACPI_MODULE_NAME        ("osl")
51
52 #define PREFIX          "ACPI: "
53
54 struct acpi_os_dpc
55 {
56     acpi_osd_exec_callback  function;
57     void                    *context;
58 };
59
60 #ifdef CONFIG_ACPI_CUSTOM_DSDT
61 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
62 #endif
63
64 #ifdef ENABLE_DEBUGGER
65 #include <linux/kdb.h>
66
67 /* stuff for debugger support */
68 int acpi_in_debugger;
69 EXPORT_SYMBOL(acpi_in_debugger);
70
71 extern char line_buf[80];
72 #endif /*ENABLE_DEBUGGER*/
73
74 int acpi_specific_hotkey_enabled;
75 EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
76
77 static unsigned int acpi_irq_irq;
78 static acpi_osd_handler acpi_irq_handler;
79 static void *acpi_irq_context;
80 static struct workqueue_struct *kacpid_wq;
81
82 acpi_status
83 acpi_os_initialize(void)
84 {
85         return AE_OK;
86 }
87
88 acpi_status
89 acpi_os_initialize1(void)
90 {
91         /*
92          * Initialize PCI configuration space access, as we'll need to access
93          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
94          */
95 #ifdef CONFIG_ACPI_PCI
96         if (!raw_pci_ops) {
97                 printk(KERN_ERR PREFIX "Access to PCI configuration space unavailable\n");
98                 return AE_NULL_ENTRY;
99         }
100 #endif
101         kacpid_wq = create_singlethread_workqueue("kacpid");
102         BUG_ON(!kacpid_wq);
103
104         return AE_OK;
105 }
106
107 acpi_status
108 acpi_os_terminate(void)
109 {
110         if (acpi_irq_handler) {
111                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
112                                                  acpi_irq_handler);
113         }
114
115         destroy_workqueue(kacpid_wq);
116
117         return AE_OK;
118 }
119
120 void
121 acpi_os_printf(const char *fmt,...)
122 {
123         va_list args;
124         va_start(args, fmt);
125         acpi_os_vprintf(fmt, args);
126         va_end(args);
127 }
128 EXPORT_SYMBOL(acpi_os_printf);
129
130 void
131 acpi_os_vprintf(const char *fmt, va_list args)
132 {
133         static char buffer[512];
134         
135         vsprintf(buffer, fmt, args);
136
137 #ifdef ENABLE_DEBUGGER
138         if (acpi_in_debugger) {
139                 kdb_printf("%s", buffer);
140         } else {
141                 printk("%s", buffer);
142         }
143 #else
144         printk("%s", buffer);
145 #endif
146 }
147
148 extern int acpi_in_resume;
149 void *
150 acpi_os_allocate(acpi_size size)
151 {
152         if (acpi_in_resume)
153                 return kmalloc(size, GFP_ATOMIC);
154         else
155                 return kmalloc(size, GFP_KERNEL);
156 }
157
158 void
159 acpi_os_free(void *ptr)
160 {
161         kfree(ptr);
162 }
163 EXPORT_SYMBOL(acpi_os_free);
164
165 acpi_status
166 acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
167 {
168         if (efi_enabled) {
169                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
170                 if (efi.acpi20)
171                         addr->pointer.physical =
172                                 (acpi_physical_address) virt_to_phys(efi.acpi20);
173                 else if (efi.acpi)
174                         addr->pointer.physical =
175                                 (acpi_physical_address) virt_to_phys(efi.acpi);
176                 else {
177                         printk(KERN_ERR PREFIX "System description tables not found\n");
178                         return AE_NOT_FOUND;
179                 }
180         } else {
181                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
182                         printk(KERN_ERR PREFIX "System description tables not found\n");
183                         return AE_NOT_FOUND;
184                 }
185         }
186
187         return AE_OK;
188 }
189
190 acpi_status
191 acpi_os_map_memory(acpi_physical_address phys, acpi_size size, void __iomem **virt)
192 {
193         if (efi_enabled) {
194                 if (EFI_MEMORY_WB & efi_mem_attributes(phys)) {
195                         *virt = (void __iomem *) phys_to_virt(phys);
196                 } else {
197                         *virt = ioremap(phys, size);
198                 }
199         } else {
200                 if (phys > ULONG_MAX) {
201                         printk(KERN_ERR PREFIX "Cannot map memory that high\n");
202                         return AE_BAD_PARAMETER;
203                 }
204                 /*
205                  * ioremap checks to ensure this is in reserved space
206                  */
207                 *virt = ioremap((unsigned long) phys, size);
208         }
209
210         if (!*virt)
211                 return AE_NO_MEMORY;
212
213         return AE_OK;
214 }
215
216 void
217 acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
218 {
219         iounmap(virt);
220 }
221
222 #ifdef ACPI_FUTURE_USAGE
223 acpi_status
224 acpi_os_get_physical_address(void *virt, acpi_physical_address *phys)
225 {
226         if(!phys || !virt)
227                 return AE_BAD_PARAMETER;
228
229         *phys = virt_to_phys(virt);
230
231         return AE_OK;
232 }
233 #endif
234
235 #define ACPI_MAX_OVERRIDE_LEN 100
236
237 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
238
239 acpi_status
240 acpi_os_predefined_override (const struct acpi_predefined_names *init_val,
241                              acpi_string *new_val)
242 {
243         if (!init_val || !new_val)
244                 return AE_BAD_PARAMETER;
245
246         *new_val = NULL;
247         if (!memcmp (init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
248                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
249                         acpi_os_name);
250                 *new_val = acpi_os_name;
251         }
252
253         return AE_OK;
254 }
255
256 acpi_status
257 acpi_os_table_override (struct acpi_table_header *existing_table,
258                         struct acpi_table_header **new_table)
259 {
260         if (!existing_table || !new_table)
261                 return AE_BAD_PARAMETER;
262
263 #ifdef CONFIG_ACPI_CUSTOM_DSDT
264         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
265                 *new_table = (struct acpi_table_header*)AmlCode;
266         else
267                 *new_table = NULL;
268 #else
269         *new_table = NULL;
270 #endif
271         return AE_OK;
272 }
273
274 static irqreturn_t
275 acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
276 {
277         return (*acpi_irq_handler)(acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
278 }
279
280 acpi_status
281 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, void *context)
282 {
283         unsigned int irq;
284
285         /*
286          * Ignore the GSI from the core, and use the value in our copy of the
287          * FADT. It may not be the same if an interrupt source override exists
288          * for the SCI.
289          */
290         gsi = acpi_fadt.sci_int;
291         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
292                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
293                        gsi);
294                 return AE_OK;
295         }
296
297         acpi_irq_handler = handler;
298         acpi_irq_context = context;
299         if (request_irq(irq, acpi_irq, SA_SHIRQ, "acpi", acpi_irq)) {
300                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
301                 return AE_NOT_ACQUIRED;
302         }
303         acpi_irq_irq = irq;
304
305         return AE_OK;
306 }
307
308 acpi_status
309 acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
310 {
311         if (irq) {
312                 free_irq(irq, acpi_irq);
313                 acpi_irq_handler = NULL;
314                 acpi_irq_irq = 0;
315         }
316
317         return AE_OK;
318 }
319
320 /*
321  * Running in interpreter thread context, safe to sleep
322  */
323
324 void
325 acpi_os_sleep(acpi_integer ms)
326 {
327         current->state = TASK_INTERRUPTIBLE;
328         schedule_timeout(((signed long) ms * HZ) / 1000);
329 }
330 EXPORT_SYMBOL(acpi_os_sleep);
331
332 void
333 acpi_os_stall(u32 us)
334 {
335         while (us) {
336                 u32 delay = 1000;
337
338                 if (delay > us)
339                         delay = us;
340                 udelay(delay);
341                 touch_nmi_watchdog();
342                 us -= delay;
343         }
344 }
345 EXPORT_SYMBOL(acpi_os_stall);
346
347 /*
348  * Support ACPI 3.0 AML Timer operand
349  * Returns 64-bit free-running, monotonically increasing timer
350  * with 100ns granularity
351  */
352 u64
353 acpi_os_get_timer (void)
354 {
355         static u64 t;
356
357 #ifdef  CONFIG_HPET
358         /* TBD: use HPET if available */
359 #endif
360
361 #ifdef  CONFIG_X86_PM_TIMER
362         /* TBD: default to PM timer if HPET was not available */
363 #endif
364         if (!t)
365                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
366
367         return ++t;
368 }
369
370 acpi_status
371 acpi_os_read_port(
372         acpi_io_address port,
373         u32             *value,
374         u32             width)
375 {
376         u32 dummy;
377
378         if (!value)
379                 value = &dummy;
380
381         switch (width)
382         {
383         case 8:
384                 *(u8*)  value = inb(port);
385                 break;
386         case 16:
387                 *(u16*) value = inw(port);
388                 break;
389         case 32:
390                 *(u32*) value = inl(port);
391                 break;
392         default:
393                 BUG();
394         }
395
396         return AE_OK;
397 }
398 EXPORT_SYMBOL(acpi_os_read_port);
399
400 acpi_status
401 acpi_os_write_port(
402         acpi_io_address port,
403         u32             value,
404         u32             width)
405 {
406         switch (width)
407         {
408         case 8:
409                 outb(value, port);
410                 break;
411         case 16:
412                 outw(value, port);
413                 break;
414         case 32:
415                 outl(value, port);
416                 break;
417         default:
418                 BUG();
419         }
420
421         return AE_OK;
422 }
423 EXPORT_SYMBOL(acpi_os_write_port);
424
425 acpi_status
426 acpi_os_read_memory(
427         acpi_physical_address   phys_addr,
428         u32                     *value,
429         u32                     width)
430 {
431         u32                     dummy;
432         void __iomem            *virt_addr;
433         int                     iomem = 0;
434
435         if (efi_enabled) {
436                 if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
437                         /* HACK ALERT! We can use readb/w/l on real memory too.. */
438                         virt_addr = (void __iomem *) phys_to_virt(phys_addr);
439                 } else {
440                         iomem = 1;
441                         virt_addr = ioremap(phys_addr, width);
442                 }
443         } else
444                 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
445         if (!value)
446                 value = &dummy;
447
448         switch (width) {
449         case 8:
450                 *(u8*) value = readb(virt_addr);
451                 break;
452         case 16:
453                 *(u16*) value = readw(virt_addr);
454                 break;
455         case 32:
456                 *(u32*) value = readl(virt_addr);
457                 break;
458         default:
459                 BUG();
460         }
461
462         if (efi_enabled) {
463                 if (iomem)
464                         iounmap(virt_addr);
465         }
466
467         return AE_OK;
468 }
469
470 acpi_status
471 acpi_os_write_memory(
472         acpi_physical_address   phys_addr,
473         u32                     value,
474         u32                     width)
475 {
476         void __iomem            *virt_addr;
477         int                     iomem = 0;
478
479         if (efi_enabled) {
480                 if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
481                         /* HACK ALERT! We can use writeb/w/l on real memory too */
482                         virt_addr = (void __iomem *) phys_to_virt(phys_addr);
483                 } else {
484                         iomem = 1;
485                         virt_addr = ioremap(phys_addr, width);
486                 }
487         } else
488                 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
489
490         switch (width) {
491         case 8:
492                 writeb(value, virt_addr);
493                 break;
494         case 16:
495                 writew(value, virt_addr);
496                 break;
497         case 32:
498                 writel(value, virt_addr);
499                 break;
500         default:
501                 BUG();
502         }
503
504         if (iomem)
505                 iounmap(virt_addr);
506
507         return AE_OK;
508 }
509
510 #ifdef CONFIG_ACPI_PCI
511
512 acpi_status
513 acpi_os_read_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, void *value, u32 width)
514 {
515         int result, size;
516
517         if (!value)
518                 return AE_BAD_PARAMETER;
519
520         switch (width) {
521         case 8:
522                 size = 1;
523                 break;
524         case 16:
525                 size = 2;
526                 break;
527         case 32:
528                 size = 4;
529                 break;
530         default:
531                 return AE_ERROR;
532         }
533
534         BUG_ON(!raw_pci_ops);
535
536         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
537                                 PCI_DEVFN(pci_id->device, pci_id->function),
538                                 reg, size, value);
539
540         return (result ? AE_ERROR : AE_OK);
541 }
542 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
543
544 acpi_status
545 acpi_os_write_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, acpi_integer value, u32 width)
546 {
547         int result, size;
548
549         switch (width) {
550         case 8:
551                 size = 1;
552                 break;
553         case 16:
554                 size = 2;
555                 break;
556         case 32:
557                 size = 4;
558                 break;
559         default:
560                 return AE_ERROR;
561         }
562
563         BUG_ON(!raw_pci_ops);
564
565         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
566                                 PCI_DEVFN(pci_id->device, pci_id->function),
567                                 reg, size, value);
568
569         return (result ? AE_ERROR : AE_OK);
570 }
571
572 /* TODO: Change code to take advantage of driver model more */
573 static void
574 acpi_os_derive_pci_id_2 (
575         acpi_handle             rhandle,        /* upper bound  */
576         acpi_handle             chandle,        /* current node */
577         struct acpi_pci_id      **id,
578         int                     *is_bridge,
579         u8                      *bus_number)
580 {
581         acpi_handle             handle;
582         struct acpi_pci_id      *pci_id = *id;
583         acpi_status             status;
584         unsigned long           temp;
585         acpi_object_type        type;
586         u8                      tu8;
587
588         acpi_get_parent(chandle, &handle);
589         if (handle != rhandle) {
590                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge, bus_number);
591
592                 status = acpi_get_type(handle, &type);
593                 if ( (ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE) )
594                         return;
595
596                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &temp);
597                 if (ACPI_SUCCESS(status)) {
598                         pci_id->device  = ACPI_HIWORD (ACPI_LODWORD (temp));
599                         pci_id->function = ACPI_LOWORD (ACPI_LODWORD (temp));
600
601                         if (*is_bridge)
602                                 pci_id->bus = *bus_number;
603
604                         /* any nicer way to get bus number of bridge ? */
605                         status = acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8, 8);
606                         if (ACPI_SUCCESS(status) &&
607                             ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
608                                 status = acpi_os_read_pci_configuration(pci_id, 0x18, &tu8, 8);
609                                 if (!ACPI_SUCCESS(status)) {
610                                         /* Certainly broken...  FIX ME */
611                                         return;
612                                 }
613                                 *is_bridge = 1;
614                                 pci_id->bus = tu8;
615                                 status = acpi_os_read_pci_configuration(pci_id, 0x19, &tu8, 8);
616                                 if (ACPI_SUCCESS(status)) {
617                                         *bus_number = tu8;
618                                 }
619                         } else
620                                 *is_bridge = 0;
621                 }
622         }
623 }
624
625 void
626 acpi_os_derive_pci_id (
627         acpi_handle             rhandle,        /* upper bound  */
628         acpi_handle             chandle,        /* current node */
629         struct acpi_pci_id      **id)
630 {
631         int is_bridge = 1;
632         u8 bus_number = (*id)->bus;
633
634         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
635 }
636
637 #else /*!CONFIG_ACPI_PCI*/
638
639 acpi_status
640 acpi_os_write_pci_configuration (
641         struct acpi_pci_id      *pci_id,
642         u32                     reg,
643         acpi_integer            value,
644         u32                     width)
645 {
646         return AE_SUPPORT;
647 }
648
649 acpi_status
650 acpi_os_read_pci_configuration (
651         struct acpi_pci_id      *pci_id,
652         u32                     reg,
653         void                    *value,
654         u32                     width)
655 {
656         return AE_SUPPORT;
657 }
658
659 void
660 acpi_os_derive_pci_id (
661         acpi_handle             rhandle,        /* upper bound  */
662         acpi_handle             chandle,        /* current node */
663         struct acpi_pci_id      **id)
664 {
665 }
666
667 #endif /*CONFIG_ACPI_PCI*/
668
669 static void
670 acpi_os_execute_deferred (
671         void *context)
672 {
673         struct acpi_os_dpc      *dpc = NULL;
674
675         ACPI_FUNCTION_TRACE ("os_execute_deferred");
676
677         dpc = (struct acpi_os_dpc *) context;
678         if (!dpc) {
679                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
680                 return_VOID;
681         }
682
683         dpc->function(dpc->context);
684
685         kfree(dpc);
686
687         return_VOID;
688 }
689
690 acpi_status
691 acpi_os_queue_for_execution(
692         u32                     priority,
693         acpi_osd_exec_callback  function,
694         void                    *context)
695 {
696         acpi_status             status = AE_OK;
697         struct acpi_os_dpc      *dpc;
698         struct work_struct      *task;
699
700         ACPI_FUNCTION_TRACE ("os_queue_for_execution");
701
702         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Scheduling function [%p(%p)] for deferred execution.\n", function, context));
703
704         if (!function)
705                 return_ACPI_STATUS (AE_BAD_PARAMETER);
706
707         /*
708          * Allocate/initialize DPC structure.  Note that this memory will be
709          * freed by the callee.  The kernel handles the tq_struct list  in a
710          * way that allows us to also free its memory inside the callee.
711          * Because we may want to schedule several tasks with different
712          * parameters we can't use the approach some kernel code uses of
713          * having a static tq_struct.
714          * We can save time and code by allocating the DPC and tq_structs
715          * from the same memory.
716          */
717
718         dpc = kmalloc(sizeof(struct acpi_os_dpc)+sizeof(struct work_struct), GFP_ATOMIC);
719         if (!dpc)
720                 return_ACPI_STATUS (AE_NO_MEMORY);
721
722         dpc->function = function;
723         dpc->context = context;
724
725         task = (void *)(dpc+1);
726         INIT_WORK(task, acpi_os_execute_deferred, (void*)dpc);
727
728         if (!queue_work(kacpid_wq, task)) {
729                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Call to queue_work() failed.\n"));
730                 kfree(dpc);
731                 status = AE_ERROR;
732         }
733
734         return_ACPI_STATUS (status);
735 }
736 EXPORT_SYMBOL(acpi_os_queue_for_execution);
737
738 void
739 acpi_os_wait_events_complete(
740         void *context)
741 {
742         flush_workqueue(kacpid_wq);
743 }
744 EXPORT_SYMBOL(acpi_os_wait_events_complete);
745
746 /*
747  * Allocate the memory for a spinlock and initialize it.
748  */
749 acpi_status
750 acpi_os_create_lock (
751         acpi_handle     *out_handle)
752 {
753         spinlock_t *lock_ptr;
754
755         ACPI_FUNCTION_TRACE ("os_create_lock");
756
757         lock_ptr = acpi_os_allocate(sizeof(spinlock_t));
758
759         spin_lock_init(lock_ptr);
760
761         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));
762
763         *out_handle = lock_ptr;
764
765         return_ACPI_STATUS (AE_OK);
766 }
767
768
769 /*
770  * Deallocate the memory for a spinlock.
771  */
772 void
773 acpi_os_delete_lock (
774         acpi_handle     handle)
775 {
776         ACPI_FUNCTION_TRACE ("os_create_lock");
777
778         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));
779
780         acpi_os_free(handle);
781
782         return_VOID;
783 }
784
785 acpi_status
786 acpi_os_create_semaphore(
787         u32             max_units,
788         u32             initial_units,
789         acpi_handle     *handle)
790 {
791         struct semaphore        *sem = NULL;
792
793         ACPI_FUNCTION_TRACE ("os_create_semaphore");
794
795         sem = acpi_os_allocate(sizeof(struct semaphore));
796         if (!sem)
797                 return_ACPI_STATUS (AE_NO_MEMORY);
798         memset(sem, 0, sizeof(struct semaphore));
799
800         sema_init(sem, initial_units);
801
802         *handle = (acpi_handle*)sem;
803
804         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", *handle, initial_units));
805
806         return_ACPI_STATUS (AE_OK);
807 }
808 EXPORT_SYMBOL(acpi_os_create_semaphore);
809
810
811 /*
812  * TODO: A better way to delete semaphores?  Linux doesn't have a
813  * 'delete_semaphore()' function -- may result in an invalid
814  * pointer dereference for non-synchronized consumers.  Should
815  * we at least check for blocked threads and signal/cancel them?
816  */
817
818 acpi_status
819 acpi_os_delete_semaphore(
820         acpi_handle     handle)
821 {
822         struct semaphore *sem = (struct semaphore*) handle;
823
824         ACPI_FUNCTION_TRACE ("os_delete_semaphore");
825
826         if (!sem)
827                 return_ACPI_STATUS (AE_BAD_PARAMETER);
828
829         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
830
831         acpi_os_free(sem); sem =  NULL;
832
833         return_ACPI_STATUS (AE_OK);
834 }
835 EXPORT_SYMBOL(acpi_os_delete_semaphore);
836
837
838 /*
839  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
840  * improvise.  The process is to sleep for one scheduler quantum
841  * until the semaphore becomes available.  Downside is that this
842  * may result in starvation for timeout-based waits when there's
843  * lots of semaphore activity.
844  *
845  * TODO: Support for units > 1?
846  */
847 acpi_status
848 acpi_os_wait_semaphore(
849         acpi_handle             handle,
850         u32                     units,
851         u16                     timeout)
852 {
853         acpi_status             status = AE_OK;
854         struct semaphore        *sem = (struct semaphore*)handle;
855         int                     ret = 0;
856
857         ACPI_FUNCTION_TRACE ("os_wait_semaphore");
858
859         if (!sem || (units < 1))
860                 return_ACPI_STATUS (AE_BAD_PARAMETER);
861
862         if (units > 1)
863                 return_ACPI_STATUS (AE_SUPPORT);
864
865         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", handle, units, timeout));
866
867         if (in_atomic())
868                 timeout = 0;
869
870         switch (timeout)
871         {
872                 /*
873                  * No Wait:
874                  * --------
875                  * A zero timeout value indicates that we shouldn't wait - just
876                  * acquire the semaphore if available otherwise return AE_TIME
877                  * (a.k.a. 'would block').
878                  */
879                 case 0:
880                 if(down_trylock(sem))
881                         status = AE_TIME;
882                 break;
883
884                 /*
885                  * Wait Indefinitely:
886                  * ------------------
887                  */
888                 case ACPI_WAIT_FOREVER:
889                 down(sem);
890                 break;
891
892                 /*
893                  * Wait w/ Timeout:
894                  * ----------------
895                  */
896                 default:
897                 // TODO: A better timeout algorithm?
898                 {
899                         int i = 0;
900                         static const int quantum_ms = 1000/HZ;
901
902                         ret = down_trylock(sem);
903                         for (i = timeout; (i > 0 && ret < 0); i -= quantum_ms) {
904                                 current->state = TASK_INTERRUPTIBLE;
905                                 schedule_timeout(1);
906                                 ret = down_trylock(sem);
907                         }
908         
909                         if (ret != 0)
910                                 status = AE_TIME;
911                 }
912                 break;
913         }
914
915         if (ACPI_FAILURE(status)) {
916                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Failed to acquire semaphore[%p|%d|%d], %s\n", 
917                         handle, units, timeout, acpi_format_exception(status)));
918         }
919         else {
920                 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquired semaphore[%p|%d|%d]\n", handle, units, timeout));
921         }
922
923         return_ACPI_STATUS (status);
924 }
925 EXPORT_SYMBOL(acpi_os_wait_semaphore);
926
927
928 /*
929  * TODO: Support for units > 1?
930  */
931 acpi_status
932 acpi_os_signal_semaphore(
933     acpi_handle             handle,
934     u32                     units)
935 {
936         struct semaphore *sem = (struct semaphore *) handle;
937
938         ACPI_FUNCTION_TRACE ("os_signal_semaphore");
939
940         if (!sem || (units < 1))
941                 return_ACPI_STATUS (AE_BAD_PARAMETER);
942
943         if (units > 1)
944                 return_ACPI_STATUS (AE_SUPPORT);
945
946         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, units));
947
948         up(sem);
949
950         return_ACPI_STATUS (AE_OK);
951 }
952 EXPORT_SYMBOL(acpi_os_signal_semaphore);
953
954 #ifdef ACPI_FUTURE_USAGE
955 u32
956 acpi_os_get_line(char *buffer)
957 {
958
959 #ifdef ENABLE_DEBUGGER
960         if (acpi_in_debugger) {
961                 u32 chars;
962
963                 kdb_read(buffer, sizeof(line_buf));
964
965                 /* remove the CR kdb includes */
966                 chars = strlen(buffer) - 1;
967                 buffer[chars] = '\0';
968         }
969 #endif
970
971         return 0;
972 }
973 #endif  /*  ACPI_FUTURE_USAGE  */
974
975 /* Assumes no unreadable holes inbetween */
976 u8
977 acpi_os_readable(void *ptr, acpi_size len)
978 {
979 #if defined(__i386__) || defined(__x86_64__) 
980         char tmp;
981         return !__get_user(tmp, (char __user *)ptr) && !__get_user(tmp, (char __user *)ptr + len - 1);
982 #endif
983         return 1;
984 }
985
986 #ifdef ACPI_FUTURE_USAGE
987 u8
988 acpi_os_writable(void *ptr, acpi_size len)
989 {
990         /* could do dummy write (racy) or a kernel page table lookup.
991            The later may be difficult at early boot when kmap doesn't work yet. */
992         return 1;
993 }
994 #endif
995
996 u32
997 acpi_os_get_thread_id (void)
998 {
999         if (!in_atomic())
1000                 return current->pid;
1001
1002         return 0;
1003 }
1004
1005 acpi_status
1006 acpi_os_signal (
1007     u32         function,
1008     void        *info)
1009 {
1010         switch (function)
1011         {
1012         case ACPI_SIGNAL_FATAL:
1013                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1014                 break;
1015         case ACPI_SIGNAL_BREAKPOINT:
1016                 /*
1017                  * AML Breakpoint
1018                  * ACPI spec. says to treat it as a NOP unless
1019                  * you are debugging.  So if/when we integrate
1020                  * AML debugger into the kernel debugger its
1021                  * hook will go here.  But until then it is
1022                  * not useful to print anything on breakpoints.
1023                  */
1024                 break;
1025         default:
1026                 break;
1027         }
1028
1029         return AE_OK;
1030 }
1031 EXPORT_SYMBOL(acpi_os_signal);
1032
1033 static int __init
1034 acpi_os_name_setup(char *str)
1035 {
1036         char *p = acpi_os_name;
1037         int count = ACPI_MAX_OVERRIDE_LEN-1;
1038
1039         if (!str || !*str)
1040                 return 0;
1041
1042         for (; count-- && str && *str; str++) {
1043                 if (isalnum(*str) || *str == ' ' || *str == ':')
1044                         *p++ = *str;
1045                 else if (*str == '\'' || *str == '"')
1046                         continue;
1047                 else
1048                         break;
1049         }
1050         *p = 0;
1051
1052         return 1;
1053                 
1054 }
1055
1056 __setup("acpi_os_name=", acpi_os_name_setup);
1057
1058 /*
1059  * _OSI control
1060  * empty string disables _OSI
1061  * TBD additional string adds to _OSI
1062  */
1063 static int __init
1064 acpi_osi_setup(char *str)
1065 {
1066         if (str == NULL || *str == '\0') {
1067                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1068                 acpi_gbl_create_osi_method = FALSE;
1069         } else
1070         {
1071                 /* TBD */
1072                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n", str);
1073         }
1074
1075         return 1;
1076 }
1077
1078 __setup("acpi_osi=", acpi_osi_setup);
1079
1080 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1081 static int __init
1082 acpi_serialize_setup(char *str)
1083 {
1084         printk(KERN_INFO PREFIX "serialize enabled\n");
1085
1086         acpi_gbl_all_methods_serialized = TRUE;
1087
1088         return 1;
1089 }
1090
1091 __setup("acpi_serialize", acpi_serialize_setup);
1092
1093 /*
1094  * Wake and Run-Time GPES are expected to be separate.
1095  * We disable wake-GPEs at run-time to prevent spurious
1096  * interrupts.
1097  *
1098  * However, if a system exists that shares Wake and
1099  * Run-time events on the same GPE this flag is available
1100  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1101  */
1102 static int __init
1103 acpi_wake_gpes_always_on_setup(char *str)
1104 {
1105         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1106
1107         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1108
1109         return 1;
1110 }
1111
1112 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1113
1114 int __init
1115 acpi_hotkey_setup(char *str)
1116 {
1117         acpi_specific_hotkey_enabled = TRUE;
1118         return 1;
1119 }
1120
1121 __setup("acpi_specific_hotkey", acpi_hotkey_setup);
1122
1123 /*
1124  * max_cstate is defined in the base kernel so modules can
1125  * change it w/o depending on the state of the processor module.
1126  */
1127 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1128
1129
1130 EXPORT_SYMBOL(max_cstate);
1131
1132 /*
1133  * Acquire a spinlock.
1134  *
1135  * handle is a pointer to the spinlock_t.
1136  * flags is *not* the result of save_flags - it is an ACPI-specific flag variable
1137  *   that indicates whether we are at interrupt level.
1138  */
1139
1140 unsigned long
1141 acpi_os_acquire_lock (
1142         acpi_handle     handle)
1143 {
1144         unsigned long flags;
1145         spin_lock_irqsave((spinlock_t *)handle, flags);
1146         return flags;
1147 }
1148
1149 /*
1150  * Release a spinlock. See above.
1151  */
1152
1153 void
1154 acpi_os_release_lock (
1155         acpi_handle     handle,
1156         unsigned long   flags)
1157 {
1158         spin_unlock_irqrestore((spinlock_t *)handle, flags);
1159 }
1160
1161
1162 #ifndef ACPI_USE_LOCAL_CACHE
1163
1164 /*******************************************************************************
1165  *
1166  * FUNCTION:    acpi_os_create_cache
1167  *
1168  * PARAMETERS:  CacheName       - Ascii name for the cache
1169  *              ObjectSize      - Size of each cached object
1170  *              MaxDepth        - Maximum depth of the cache (in objects)
1171  *              ReturnCache     - Where the new cache object is returned
1172  *
1173  * RETURN:      Status
1174  *
1175  * DESCRIPTION: Create a cache object
1176  *
1177  ******************************************************************************/
1178
1179 acpi_status
1180 acpi_os_create_cache (
1181     char                    *name,
1182     u16                  size,
1183     u16                  depth,
1184     acpi_cache_t            **cache)
1185 {
1186         *cache = kmem_cache_create (name, size, 0, 0, NULL, NULL);
1187         return AE_OK;
1188 }
1189
1190 /*******************************************************************************
1191  *
1192  * FUNCTION:    acpi_os_purge_cache
1193  *
1194  * PARAMETERS:  Cache           - Handle to cache object
1195  *
1196  * RETURN:      Status
1197  *
1198  * DESCRIPTION: Free all objects within the requested cache.
1199  *
1200  ******************************************************************************/
1201
1202 acpi_status
1203 acpi_os_purge_cache (
1204     acpi_cache_t        *cache)
1205 {
1206     (void) kmem_cache_shrink(cache);
1207     return (AE_OK);
1208 }
1209
1210 /*******************************************************************************
1211  *
1212  * FUNCTION:    acpi_os_delete_cache
1213  *
1214  * PARAMETERS:  Cache           - Handle to cache object
1215  *
1216  * RETURN:      Status
1217  *
1218  * DESCRIPTION: Free all objects within the requested cache and delete the
1219  *              cache object.
1220  *
1221  ******************************************************************************/
1222
1223 acpi_status
1224 acpi_os_delete_cache (
1225     acpi_cache_t *cache)
1226 {
1227     (void)kmem_cache_destroy(cache);
1228     return (AE_OK);
1229 }
1230
1231 /*******************************************************************************
1232  *
1233  * FUNCTION:    acpi_os_release_object
1234  *
1235  * PARAMETERS:  Cache       - Handle to cache object
1236  *              Object      - The object to be released
1237  *
1238  * RETURN:      None
1239  *
1240  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1241  *              the object is deleted.
1242  *
1243  ******************************************************************************/
1244
1245 acpi_status
1246 acpi_os_release_object (
1247     acpi_cache_t *cache,
1248     void *object)
1249 {
1250     kmem_cache_free(cache, object);
1251     return (AE_OK);
1252 }
1253
1254 /*******************************************************************************
1255  *
1256  * FUNCTION:    acpi_os_acquire_object
1257  *
1258  * PARAMETERS:  Cache           - Handle to cache object
1259  *              ReturnObject    - Where the object is returned
1260  *
1261  * RETURN:      Status
1262  *
1263  * DESCRIPTION: Get an object from the specified cache.  If cache is empty,
1264  *              the object is allocated.
1265  *
1266  ******************************************************************************/
1267
1268 void *
1269 acpi_os_acquire_object (
1270     acpi_cache_t *cache)
1271 {
1272     void *object = kmem_cache_alloc(cache, GFP_KERNEL);
1273     WARN_ON(!object);
1274     return object;
1275 }
1276
1277 #endif
1278