blob: cb16cc11fee88ad7a27c28af650edbb6697e098a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
50ACPI_MODULE_NAME ("osl")
51
52#define PREFIX "ACPI: "
53
54struct 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 */
68int acpi_in_debugger;
69EXPORT_SYMBOL(acpi_in_debugger);
70
71extern char line_buf[80];
72#endif /*ENABLE_DEBUGGER*/
73
Luming Yu30e332f2005-08-12 00:31:00 -040074int acpi_specific_hotkey_enabled = TRUE;
Luming Yufb9802f2005-03-18 18:03:45 -050075EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077static unsigned int acpi_irq_irq;
78static acpi_osd_handler acpi_irq_handler;
79static void *acpi_irq_context;
80static struct workqueue_struct *kacpid_wq;
81
82acpi_status
83acpi_os_initialize(void)
84{
85 return AE_OK;
86}
87
88acpi_status
89acpi_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
107acpi_status
108acpi_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
120void
121acpi_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}
128EXPORT_SYMBOL(acpi_os_printf);
129
130void
131acpi_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
148void *
149acpi_os_allocate(acpi_size size)
150{
151 return kmalloc(size, GFP_KERNEL);
152}
153
154void
155acpi_os_free(void *ptr)
156{
157 kfree(ptr);
158}
159EXPORT_SYMBOL(acpi_os_free);
160
161acpi_status
162acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
163{
164 if (efi_enabled) {
165 addr->pointer_type = ACPI_PHYSICAL_POINTER;
166 if (efi.acpi20)
167 addr->pointer.physical =
168 (acpi_physical_address) virt_to_phys(efi.acpi20);
169 else if (efi.acpi)
170 addr->pointer.physical =
171 (acpi_physical_address) virt_to_phys(efi.acpi);
172 else {
173 printk(KERN_ERR PREFIX "System description tables not found\n");
174 return AE_NOT_FOUND;
175 }
176 } else {
177 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
178 printk(KERN_ERR PREFIX "System description tables not found\n");
179 return AE_NOT_FOUND;
180 }
181 }
182
183 return AE_OK;
184}
185
186acpi_status
187acpi_os_map_memory(acpi_physical_address phys, acpi_size size, void __iomem **virt)
188{
189 if (efi_enabled) {
190 if (EFI_MEMORY_WB & efi_mem_attributes(phys)) {
191 *virt = (void __iomem *) phys_to_virt(phys);
192 } else {
193 *virt = ioremap(phys, size);
194 }
195 } else {
196 if (phys > ULONG_MAX) {
197 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
198 return AE_BAD_PARAMETER;
199 }
200 /*
201 * ioremap checks to ensure this is in reserved space
202 */
203 *virt = ioremap((unsigned long) phys, size);
204 }
205
206 if (!*virt)
207 return AE_NO_MEMORY;
208
209 return AE_OK;
210}
211
212void
213acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
214{
215 iounmap(virt);
216}
217
218#ifdef ACPI_FUTURE_USAGE
219acpi_status
220acpi_os_get_physical_address(void *virt, acpi_physical_address *phys)
221{
222 if(!phys || !virt)
223 return AE_BAD_PARAMETER;
224
225 *phys = virt_to_phys(virt);
226
227 return AE_OK;
228}
229#endif
230
231#define ACPI_MAX_OVERRIDE_LEN 100
232
233static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
234
235acpi_status
236acpi_os_predefined_override (const struct acpi_predefined_names *init_val,
237 acpi_string *new_val)
238{
239 if (!init_val || !new_val)
240 return AE_BAD_PARAMETER;
241
242 *new_val = NULL;
243 if (!memcmp (init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
244 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
245 acpi_os_name);
246 *new_val = acpi_os_name;
247 }
248
249 return AE_OK;
250}
251
252acpi_status
253acpi_os_table_override (struct acpi_table_header *existing_table,
254 struct acpi_table_header **new_table)
255{
256 if (!existing_table || !new_table)
257 return AE_BAD_PARAMETER;
258
259#ifdef CONFIG_ACPI_CUSTOM_DSDT
260 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
261 *new_table = (struct acpi_table_header*)AmlCode;
262 else
263 *new_table = NULL;
264#else
265 *new_table = NULL;
266#endif
267 return AE_OK;
268}
269
270static irqreturn_t
271acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
272{
273 return (*acpi_irq_handler)(acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
274}
275
276acpi_status
277acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, void *context)
278{
279 unsigned int irq;
280
281 /*
282 * Ignore the GSI from the core, and use the value in our copy of the
283 * FADT. It may not be the same if an interrupt source override exists
284 * for the SCI.
285 */
286 gsi = acpi_fadt.sci_int;
287 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
288 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
289 gsi);
290 return AE_OK;
291 }
292
293 acpi_irq_handler = handler;
294 acpi_irq_context = context;
295 if (request_irq(irq, acpi_irq, SA_SHIRQ, "acpi", acpi_irq)) {
296 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
297 return AE_NOT_ACQUIRED;
298 }
299 acpi_irq_irq = irq;
300
301 return AE_OK;
302}
303
304acpi_status
305acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
306{
307 if (irq) {
308 free_irq(irq, acpi_irq);
309 acpi_irq_handler = NULL;
310 acpi_irq_irq = 0;
311 }
312
313 return AE_OK;
314}
315
316/*
317 * Running in interpreter thread context, safe to sleep
318 */
319
320void
321acpi_os_sleep(acpi_integer ms)
322{
323 current->state = TASK_INTERRUPTIBLE;
324 schedule_timeout(((signed long) ms * HZ) / 1000);
325}
326EXPORT_SYMBOL(acpi_os_sleep);
327
328void
329acpi_os_stall(u32 us)
330{
331 while (us) {
332 u32 delay = 1000;
333
334 if (delay > us)
335 delay = us;
336 udelay(delay);
337 touch_nmi_watchdog();
338 us -= delay;
339 }
340}
341EXPORT_SYMBOL(acpi_os_stall);
342
343/*
344 * Support ACPI 3.0 AML Timer operand
345 * Returns 64-bit free-running, monotonically increasing timer
346 * with 100ns granularity
347 */
348u64
349acpi_os_get_timer (void)
350{
351 static u64 t;
352
353#ifdef CONFIG_HPET
354 /* TBD: use HPET if available */
355#endif
356
357#ifdef CONFIG_X86_PM_TIMER
358 /* TBD: default to PM timer if HPET was not available */
359#endif
360 if (!t)
361 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
362
363 return ++t;
364}
365
366acpi_status
367acpi_os_read_port(
368 acpi_io_address port,
369 u32 *value,
370 u32 width)
371{
372 u32 dummy;
373
374 if (!value)
375 value = &dummy;
376
377 switch (width)
378 {
379 case 8:
380 *(u8*) value = inb(port);
381 break;
382 case 16:
383 *(u16*) value = inw(port);
384 break;
385 case 32:
386 *(u32*) value = inl(port);
387 break;
388 default:
389 BUG();
390 }
391
392 return AE_OK;
393}
394EXPORT_SYMBOL(acpi_os_read_port);
395
396acpi_status
397acpi_os_write_port(
398 acpi_io_address port,
399 u32 value,
400 u32 width)
401{
402 switch (width)
403 {
404 case 8:
405 outb(value, port);
406 break;
407 case 16:
408 outw(value, port);
409 break;
410 case 32:
411 outl(value, port);
412 break;
413 default:
414 BUG();
415 }
416
417 return AE_OK;
418}
419EXPORT_SYMBOL(acpi_os_write_port);
420
421acpi_status
422acpi_os_read_memory(
423 acpi_physical_address phys_addr,
424 u32 *value,
425 u32 width)
426{
427 u32 dummy;
428 void __iomem *virt_addr;
429 int iomem = 0;
430
431 if (efi_enabled) {
432 if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
433 /* HACK ALERT! We can use readb/w/l on real memory too.. */
434 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
435 } else {
436 iomem = 1;
437 virt_addr = ioremap(phys_addr, width);
438 }
439 } else
440 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
441 if (!value)
442 value = &dummy;
443
444 switch (width) {
445 case 8:
446 *(u8*) value = readb(virt_addr);
447 break;
448 case 16:
449 *(u16*) value = readw(virt_addr);
450 break;
451 case 32:
452 *(u32*) value = readl(virt_addr);
453 break;
454 default:
455 BUG();
456 }
457
458 if (efi_enabled) {
459 if (iomem)
460 iounmap(virt_addr);
461 }
462
463 return AE_OK;
464}
465
466acpi_status
467acpi_os_write_memory(
468 acpi_physical_address phys_addr,
469 u32 value,
470 u32 width)
471{
472 void __iomem *virt_addr;
473 int iomem = 0;
474
475 if (efi_enabled) {
476 if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
477 /* HACK ALERT! We can use writeb/w/l on real memory too */
478 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
479 } else {
480 iomem = 1;
481 virt_addr = ioremap(phys_addr, width);
482 }
483 } else
484 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
485
486 switch (width) {
487 case 8:
488 writeb(value, virt_addr);
489 break;
490 case 16:
491 writew(value, virt_addr);
492 break;
493 case 32:
494 writel(value, virt_addr);
495 break;
496 default:
497 BUG();
498 }
499
500 if (iomem)
501 iounmap(virt_addr);
502
503 return AE_OK;
504}
505
506#ifdef CONFIG_ACPI_PCI
507
508acpi_status
509acpi_os_read_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, void *value, u32 width)
510{
511 int result, size;
512
513 if (!value)
514 return AE_BAD_PARAMETER;
515
516 switch (width) {
517 case 8:
518 size = 1;
519 break;
520 case 16:
521 size = 2;
522 break;
523 case 32:
524 size = 4;
525 break;
526 default:
527 return AE_ERROR;
528 }
529
530 BUG_ON(!raw_pci_ops);
531
532 result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
533 PCI_DEVFN(pci_id->device, pci_id->function),
534 reg, size, value);
535
536 return (result ? AE_ERROR : AE_OK);
537}
538EXPORT_SYMBOL(acpi_os_read_pci_configuration);
539
540acpi_status
541acpi_os_write_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, acpi_integer value, u32 width)
542{
543 int result, size;
544
545 switch (width) {
546 case 8:
547 size = 1;
548 break;
549 case 16:
550 size = 2;
551 break;
552 case 32:
553 size = 4;
554 break;
555 default:
556 return AE_ERROR;
557 }
558
559 BUG_ON(!raw_pci_ops);
560
561 result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
562 PCI_DEVFN(pci_id->device, pci_id->function),
563 reg, size, value);
564
565 return (result ? AE_ERROR : AE_OK);
566}
567
568/* TODO: Change code to take advantage of driver model more */
569static void
570acpi_os_derive_pci_id_2 (
571 acpi_handle rhandle, /* upper bound */
572 acpi_handle chandle, /* current node */
573 struct acpi_pci_id **id,
574 int *is_bridge,
575 u8 *bus_number)
576{
577 acpi_handle handle;
578 struct acpi_pci_id *pci_id = *id;
579 acpi_status status;
580 unsigned long temp;
581 acpi_object_type type;
582 u8 tu8;
583
584 acpi_get_parent(chandle, &handle);
585 if (handle != rhandle) {
586 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge, bus_number);
587
588 status = acpi_get_type(handle, &type);
589 if ( (ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE) )
590 return;
591
592 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &temp);
593 if (ACPI_SUCCESS(status)) {
594 pci_id->device = ACPI_HIWORD (ACPI_LODWORD (temp));
595 pci_id->function = ACPI_LOWORD (ACPI_LODWORD (temp));
596
597 if (*is_bridge)
598 pci_id->bus = *bus_number;
599
600 /* any nicer way to get bus number of bridge ? */
601 status = acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8, 8);
602 if (ACPI_SUCCESS(status) &&
603 ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
604 status = acpi_os_read_pci_configuration(pci_id, 0x18, &tu8, 8);
605 if (!ACPI_SUCCESS(status)) {
606 /* Certainly broken... FIX ME */
607 return;
608 }
609 *is_bridge = 1;
610 pci_id->bus = tu8;
611 status = acpi_os_read_pci_configuration(pci_id, 0x19, &tu8, 8);
612 if (ACPI_SUCCESS(status)) {
613 *bus_number = tu8;
614 }
615 } else
616 *is_bridge = 0;
617 }
618 }
619}
620
621void
622acpi_os_derive_pci_id (
623 acpi_handle rhandle, /* upper bound */
624 acpi_handle chandle, /* current node */
625 struct acpi_pci_id **id)
626{
627 int is_bridge = 1;
628 u8 bus_number = (*id)->bus;
629
630 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
631}
632
633#else /*!CONFIG_ACPI_PCI*/
634
635acpi_status
636acpi_os_write_pci_configuration (
637 struct acpi_pci_id *pci_id,
638 u32 reg,
639 acpi_integer value,
640 u32 width)
641{
642 return AE_SUPPORT;
643}
644
645acpi_status
646acpi_os_read_pci_configuration (
647 struct acpi_pci_id *pci_id,
648 u32 reg,
649 void *value,
650 u32 width)
651{
652 return AE_SUPPORT;
653}
654
655void
656acpi_os_derive_pci_id (
657 acpi_handle rhandle, /* upper bound */
658 acpi_handle chandle, /* current node */
659 struct acpi_pci_id **id)
660{
661}
662
663#endif /*CONFIG_ACPI_PCI*/
664
665static void
666acpi_os_execute_deferred (
667 void *context)
668{
669 struct acpi_os_dpc *dpc = NULL;
670
671 ACPI_FUNCTION_TRACE ("os_execute_deferred");
672
673 dpc = (struct acpi_os_dpc *) context;
674 if (!dpc) {
675 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
676 return_VOID;
677 }
678
679 dpc->function(dpc->context);
680
681 kfree(dpc);
682
683 return_VOID;
684}
685
686acpi_status
687acpi_os_queue_for_execution(
688 u32 priority,
689 acpi_osd_exec_callback function,
690 void *context)
691{
692 acpi_status status = AE_OK;
693 struct acpi_os_dpc *dpc;
694 struct work_struct *task;
695
696 ACPI_FUNCTION_TRACE ("os_queue_for_execution");
697
698 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Scheduling function [%p(%p)] for deferred execution.\n", function, context));
699
700 if (!function)
701 return_ACPI_STATUS (AE_BAD_PARAMETER);
702
703 /*
704 * Allocate/initialize DPC structure. Note that this memory will be
705 * freed by the callee. The kernel handles the tq_struct list in a
706 * way that allows us to also free its memory inside the callee.
707 * Because we may want to schedule several tasks with different
708 * parameters we can't use the approach some kernel code uses of
709 * having a static tq_struct.
710 * We can save time and code by allocating the DPC and tq_structs
711 * from the same memory.
712 */
713
714 dpc = kmalloc(sizeof(struct acpi_os_dpc)+sizeof(struct work_struct), GFP_ATOMIC);
715 if (!dpc)
716 return_ACPI_STATUS (AE_NO_MEMORY);
717
718 dpc->function = function;
719 dpc->context = context;
720
721 task = (void *)(dpc+1);
722 INIT_WORK(task, acpi_os_execute_deferred, (void*)dpc);
723
724 if (!queue_work(kacpid_wq, task)) {
725 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Call to queue_work() failed.\n"));
726 kfree(dpc);
727 status = AE_ERROR;
728 }
729
730 return_ACPI_STATUS (status);
731}
732EXPORT_SYMBOL(acpi_os_queue_for_execution);
733
734void
735acpi_os_wait_events_complete(
736 void *context)
737{
738 flush_workqueue(kacpid_wq);
739}
740EXPORT_SYMBOL(acpi_os_wait_events_complete);
741
742/*
743 * Allocate the memory for a spinlock and initialize it.
744 */
745acpi_status
746acpi_os_create_lock (
747 acpi_handle *out_handle)
748{
749 spinlock_t *lock_ptr;
750
751 ACPI_FUNCTION_TRACE ("os_create_lock");
752
753 lock_ptr = acpi_os_allocate(sizeof(spinlock_t));
754
755 spin_lock_init(lock_ptr);
756
757 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));
758
759 *out_handle = lock_ptr;
760
761 return_ACPI_STATUS (AE_OK);
762}
763
764
765/*
766 * Deallocate the memory for a spinlock.
767 */
768void
769acpi_os_delete_lock (
770 acpi_handle handle)
771{
772 ACPI_FUNCTION_TRACE ("os_create_lock");
773
774 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));
775
776 acpi_os_free(handle);
777
778 return_VOID;
779}
780
781/*
782 * Acquire a spinlock.
783 *
784 * handle is a pointer to the spinlock_t.
785 * flags is *not* the result of save_flags - it is an ACPI-specific flag variable
786 * that indicates whether we are at interrupt level.
787 */
788void
789acpi_os_acquire_lock (
790 acpi_handle handle,
791 u32 flags)
792{
793 ACPI_FUNCTION_TRACE ("os_acquire_lock");
794
795 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquiring spinlock[%p] from %s level\n", handle,
796 ((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
797
798 if (flags & ACPI_NOT_ISR)
799 ACPI_DISABLE_IRQS();
800
801 spin_lock((spinlock_t *)handle);
802
803 return_VOID;
804}
805
806
807/*
808 * Release a spinlock. See above.
809 */
810void
811acpi_os_release_lock (
812 acpi_handle handle,
813 u32 flags)
814{
815 ACPI_FUNCTION_TRACE ("os_release_lock");
816
817 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Releasing spinlock[%p] from %s level\n", handle,
818 ((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
819
820 spin_unlock((spinlock_t *)handle);
821
822 if (flags & ACPI_NOT_ISR)
823 ACPI_ENABLE_IRQS();
824
825 return_VOID;
826}
827
828
829acpi_status
830acpi_os_create_semaphore(
831 u32 max_units,
832 u32 initial_units,
833 acpi_handle *handle)
834{
835 struct semaphore *sem = NULL;
836
837 ACPI_FUNCTION_TRACE ("os_create_semaphore");
838
839 sem = acpi_os_allocate(sizeof(struct semaphore));
840 if (!sem)
841 return_ACPI_STATUS (AE_NO_MEMORY);
842 memset(sem, 0, sizeof(struct semaphore));
843
844 sema_init(sem, initial_units);
845
846 *handle = (acpi_handle*)sem;
847
848 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", *handle, initial_units));
849
850 return_ACPI_STATUS (AE_OK);
851}
852EXPORT_SYMBOL(acpi_os_create_semaphore);
853
854
855/*
856 * TODO: A better way to delete semaphores? Linux doesn't have a
857 * 'delete_semaphore()' function -- may result in an invalid
858 * pointer dereference for non-synchronized consumers. Should
859 * we at least check for blocked threads and signal/cancel them?
860 */
861
862acpi_status
863acpi_os_delete_semaphore(
864 acpi_handle handle)
865{
866 struct semaphore *sem = (struct semaphore*) handle;
867
868 ACPI_FUNCTION_TRACE ("os_delete_semaphore");
869
870 if (!sem)
871 return_ACPI_STATUS (AE_BAD_PARAMETER);
872
873 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
874
875 acpi_os_free(sem); sem = NULL;
876
877 return_ACPI_STATUS (AE_OK);
878}
879EXPORT_SYMBOL(acpi_os_delete_semaphore);
880
881
882/*
883 * TODO: The kernel doesn't have a 'down_timeout' function -- had to
884 * improvise. The process is to sleep for one scheduler quantum
885 * until the semaphore becomes available. Downside is that this
886 * may result in starvation for timeout-based waits when there's
887 * lots of semaphore activity.
888 *
889 * TODO: Support for units > 1?
890 */
891acpi_status
892acpi_os_wait_semaphore(
893 acpi_handle handle,
894 u32 units,
895 u16 timeout)
896{
897 acpi_status status = AE_OK;
898 struct semaphore *sem = (struct semaphore*)handle;
899 int ret = 0;
900
901 ACPI_FUNCTION_TRACE ("os_wait_semaphore");
902
903 if (!sem || (units < 1))
904 return_ACPI_STATUS (AE_BAD_PARAMETER);
905
906 if (units > 1)
907 return_ACPI_STATUS (AE_SUPPORT);
908
909 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", handle, units, timeout));
910
911 if (in_atomic())
912 timeout = 0;
913
914 switch (timeout)
915 {
916 /*
917 * No Wait:
918 * --------
919 * A zero timeout value indicates that we shouldn't wait - just
920 * acquire the semaphore if available otherwise return AE_TIME
921 * (a.k.a. 'would block').
922 */
923 case 0:
924 if(down_trylock(sem))
925 status = AE_TIME;
926 break;
927
928 /*
929 * Wait Indefinitely:
930 * ------------------
931 */
932 case ACPI_WAIT_FOREVER:
933 down(sem);
934 break;
935
936 /*
937 * Wait w/ Timeout:
938 * ----------------
939 */
940 default:
941 // TODO: A better timeout algorithm?
942 {
943 int i = 0;
944 static const int quantum_ms = 1000/HZ;
945
946 ret = down_trylock(sem);
947 for (i = timeout; (i > 0 && ret < 0); i -= quantum_ms) {
948 current->state = TASK_INTERRUPTIBLE;
949 schedule_timeout(1);
950 ret = down_trylock(sem);
951 }
952
953 if (ret != 0)
954 status = AE_TIME;
955 }
956 break;
957 }
958
959 if (ACPI_FAILURE(status)) {
960 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Failed to acquire semaphore[%p|%d|%d], %s\n",
961 handle, units, timeout, acpi_format_exception(status)));
962 }
963 else {
964 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquired semaphore[%p|%d|%d]\n", handle, units, timeout));
965 }
966
967 return_ACPI_STATUS (status);
968}
969EXPORT_SYMBOL(acpi_os_wait_semaphore);
970
971
972/*
973 * TODO: Support for units > 1?
974 */
975acpi_status
976acpi_os_signal_semaphore(
977 acpi_handle handle,
978 u32 units)
979{
980 struct semaphore *sem = (struct semaphore *) handle;
981
982 ACPI_FUNCTION_TRACE ("os_signal_semaphore");
983
984 if (!sem || (units < 1))
985 return_ACPI_STATUS (AE_BAD_PARAMETER);
986
987 if (units > 1)
988 return_ACPI_STATUS (AE_SUPPORT);
989
990 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, units));
991
992 up(sem);
993
994 return_ACPI_STATUS (AE_OK);
995}
996EXPORT_SYMBOL(acpi_os_signal_semaphore);
997
998#ifdef ACPI_FUTURE_USAGE
999u32
1000acpi_os_get_line(char *buffer)
1001{
1002
1003#ifdef ENABLE_DEBUGGER
1004 if (acpi_in_debugger) {
1005 u32 chars;
1006
1007 kdb_read(buffer, sizeof(line_buf));
1008
1009 /* remove the CR kdb includes */
1010 chars = strlen(buffer) - 1;
1011 buffer[chars] = '\0';
1012 }
1013#endif
1014
1015 return 0;
1016}
1017#endif /* ACPI_FUTURE_USAGE */
1018
1019/* Assumes no unreadable holes inbetween */
1020u8
1021acpi_os_readable(void *ptr, acpi_size len)
1022{
1023#if defined(__i386__) || defined(__x86_64__)
1024 char tmp;
1025 return !__get_user(tmp, (char __user *)ptr) && !__get_user(tmp, (char __user *)ptr + len - 1);
1026#endif
1027 return 1;
1028}
1029
1030#ifdef ACPI_FUTURE_USAGE
1031u8
1032acpi_os_writable(void *ptr, acpi_size len)
1033{
1034 /* could do dummy write (racy) or a kernel page table lookup.
1035 The later may be difficult at early boot when kmap doesn't work yet. */
1036 return 1;
1037}
1038#endif
1039
1040u32
1041acpi_os_get_thread_id (void)
1042{
1043 if (!in_atomic())
1044 return current->pid;
1045
1046 return 0;
1047}
1048
1049acpi_status
1050acpi_os_signal (
1051 u32 function,
1052 void *info)
1053{
1054 switch (function)
1055 {
1056 case ACPI_SIGNAL_FATAL:
1057 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1058 break;
1059 case ACPI_SIGNAL_BREAKPOINT:
1060 /*
1061 * AML Breakpoint
1062 * ACPI spec. says to treat it as a NOP unless
1063 * you are debugging. So if/when we integrate
1064 * AML debugger into the kernel debugger its
1065 * hook will go here. But until then it is
1066 * not useful to print anything on breakpoints.
1067 */
1068 break;
1069 default:
1070 break;
1071 }
1072
1073 return AE_OK;
1074}
1075EXPORT_SYMBOL(acpi_os_signal);
1076
1077static int __init
1078acpi_os_name_setup(char *str)
1079{
1080 char *p = acpi_os_name;
1081 int count = ACPI_MAX_OVERRIDE_LEN-1;
1082
1083 if (!str || !*str)
1084 return 0;
1085
1086 for (; count-- && str && *str; str++) {
1087 if (isalnum(*str) || *str == ' ' || *str == ':')
1088 *p++ = *str;
1089 else if (*str == '\'' || *str == '"')
1090 continue;
1091 else
1092 break;
1093 }
1094 *p = 0;
1095
1096 return 1;
1097
1098}
1099
1100__setup("acpi_os_name=", acpi_os_name_setup);
1101
1102/*
1103 * _OSI control
1104 * empty string disables _OSI
1105 * TBD additional string adds to _OSI
1106 */
1107static int __init
1108acpi_osi_setup(char *str)
1109{
1110 if (str == NULL || *str == '\0') {
1111 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1112 acpi_gbl_create_osi_method = FALSE;
1113 } else
1114 {
1115 /* TBD */
1116 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n", str);
1117 }
1118
1119 return 1;
1120}
1121
1122__setup("acpi_osi=", acpi_osi_setup);
1123
1124/* enable serialization to combat AE_ALREADY_EXISTS errors */
1125static int __init
1126acpi_serialize_setup(char *str)
1127{
1128 printk(KERN_INFO PREFIX "serialize enabled\n");
1129
1130 acpi_gbl_all_methods_serialized = TRUE;
1131
1132 return 1;
1133}
1134
1135__setup("acpi_serialize", acpi_serialize_setup);
1136
1137/*
1138 * Wake and Run-Time GPES are expected to be separate.
1139 * We disable wake-GPEs at run-time to prevent spurious
1140 * interrupts.
1141 *
1142 * However, if a system exists that shares Wake and
1143 * Run-time events on the same GPE this flag is available
1144 * to tell Linux to keep the wake-time GPEs enabled at run-time.
1145 */
1146static int __init
1147acpi_wake_gpes_always_on_setup(char *str)
1148{
1149 printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1150
1151 acpi_gbl_leave_wake_gpes_disabled = FALSE;
1152
1153 return 1;
1154}
1155
1156__setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1157
Luming Yufb9802f2005-03-18 18:03:45 -05001158int __init
1159acpi_hotkey_setup(char *str)
1160{
Luming Yu30e332f2005-08-12 00:31:00 -04001161 acpi_specific_hotkey_enabled = FALSE;
Luming Yufb9802f2005-03-18 18:03:45 -05001162 return 1;
1163}
1164
Luming Yu30e332f2005-08-12 00:31:00 -04001165__setup("acpi_generic_hotkey", acpi_hotkey_setup);
Luming Yufb9802f2005-03-18 18:03:45 -05001166
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167/*
1168 * max_cstate is defined in the base kernel so modules can
1169 * change it w/o depending on the state of the processor module.
1170 */
1171unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1172
1173
1174EXPORT_SYMBOL(max_cstate);