e53fb516f9d45538dbfdedc002ad3dcb753e200e
[linux-2.6.git] / drivers / acpi / osl.c
1 /*
2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3  *
4  *  Copyright (C) 2000       Andrew Henroid
5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7  *
8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; either version 2 of the License, or
13  *  (at your option) any later version.
14  *
15  *  This program is distributed in the hope that it will be useful,
16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  *  GNU General Public License for more details.
19  *
20  *  You should have received a copy of the GNU General Public License
21  *  along with this program; if not, write to the Free Software
22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
23  *
24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25  *
26  */
27
28 #include <linux/module.h>
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
31 #include <linux/mm.h>
32 #include <linux/pci.h>
33 #include <linux/interrupt.h>
34 #include <linux/kmod.h>
35 #include <linux/delay.h>
36 #include <linux/dmi.h>
37 #include <linux/workqueue.h>
38 #include <linux/nmi.h>
39 #include <linux/acpi.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         struct work_struct work;
55 };
56
57 #ifdef CONFIG_ACPI_CUSTOM_DSDT
58 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
59 #endif
60
61 #ifdef ENABLE_DEBUGGER
62 #include <linux/kdb.h>
63
64 /* stuff for debugger support */
65 int acpi_in_debugger;
66 EXPORT_SYMBOL(acpi_in_debugger);
67
68 extern char line_buf[80];
69 #endif                          /*ENABLE_DEBUGGER */
70
71 static unsigned int acpi_irq_irq;
72 static acpi_osd_handler acpi_irq_handler;
73 static void *acpi_irq_context;
74 static struct workqueue_struct *kacpid_wq;
75 static struct workqueue_struct *kacpi_notify_wq;
76
77 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
78 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
79
80 /*
81  * "Ode to _OSI(Linux)"
82  *
83  * osi_linux -- Control response to BIOS _OSI(Linux) query.
84  *
85  * As Linux evolves, the features that it supports change.
86  * So an OSI string such as "Linux" is not specific enough
87  * to be useful across multiple versions of Linux.  It
88  * doesn't identify any particular feature, interface,
89  * or even any particular version of Linux...
90  *
91  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
92  * to a BIOS _OSI(Linux) query.  When
93  * a reference mobile BIOS started using it, its use
94  * started to spread to many vendor platforms.
95  * As it is not supportable, we need to halt that spread.
96  *
97  * Today, most BIOS references to _OSI(Linux) are noise --
98  * they have no functional effect and are just dead code
99  * carried over from the reference BIOS.
100  *
101  * The next most common case is that _OSI(Linux) harms Linux,
102  * usually by causing the BIOS to follow paths that are
103  * not tested during Windows validation.
104  *
105  * Finally, there is a short list of platforms
106  * where OSI(Linux) benefits Linux.
107  *
108  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
109  * DMI is used to disable the dmesg warning about OSI(Linux)
110  * on platforms where it is known to have no effect.
111  * But a dmesg warning remains for systems where
112  * we do not know if OSI(Linux) is good or bad for the system.
113  * DMI is also used to enable OSI(Linux) for the machines
114  * that are known to need it.
115  *
116  * BIOS writers should NOT query _OSI(Linux) on future systems.
117  * It will be ignored by default, and to get Linux to
118  * not ignore it will require a kernel source update to
119  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
120  */
121 #define OSI_LINUX_ENABLE 0
122
123 struct osi_linux {
124         unsigned int    enable:1;
125         unsigned int    dmi:1;
126         unsigned int    cmdline:1;
127         unsigned int    known:1;
128 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
129
130 static void __init acpi_request_region (struct acpi_generic_address *addr,
131         unsigned int length, char *desc)
132 {
133         struct resource *res;
134
135         if (!addr->address || !length)
136                 return;
137
138         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
139                 res = request_region(addr->address, length, desc);
140         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
141                 res = request_mem_region(addr->address, length, desc);
142 }
143
144 static int __init acpi_reserve_resources(void)
145 {
146         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
147                 "ACPI PM1a_EVT_BLK");
148
149         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
150                 "ACPI PM1b_EVT_BLK");
151
152         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
153                 "ACPI PM1a_CNT_BLK");
154
155         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
156                 "ACPI PM1b_CNT_BLK");
157
158         if (acpi_gbl_FADT.pm_timer_length == 4)
159                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
160
161         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
162                 "ACPI PM2_CNT_BLK");
163
164         /* Length of GPE blocks must be a non-negative multiple of 2 */
165
166         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
167                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
168                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
169
170         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
171                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
172                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
173
174         return 0;
175 }
176 device_initcall(acpi_reserve_resources);
177
178 acpi_status __init acpi_os_initialize(void)
179 {
180         return AE_OK;
181 }
182
183 acpi_status acpi_os_initialize1(void)
184 {
185         /*
186          * Initialize PCI configuration space access, as we'll need to access
187          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
188          */
189         if (!raw_pci_ops) {
190                 printk(KERN_ERR PREFIX
191                        "Access to PCI configuration space unavailable\n");
192                 return AE_NULL_ENTRY;
193         }
194         kacpid_wq = create_singlethread_workqueue("kacpid");
195         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
196         BUG_ON(!kacpid_wq);
197         BUG_ON(!kacpi_notify_wq);
198         return AE_OK;
199 }
200
201 acpi_status acpi_os_terminate(void)
202 {
203         if (acpi_irq_handler) {
204                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
205                                                  acpi_irq_handler);
206         }
207
208         destroy_workqueue(kacpid_wq);
209         destroy_workqueue(kacpi_notify_wq);
210
211         return AE_OK;
212 }
213
214 void acpi_os_printf(const char *fmt, ...)
215 {
216         va_list args;
217         va_start(args, fmt);
218         acpi_os_vprintf(fmt, args);
219         va_end(args);
220 }
221
222 EXPORT_SYMBOL(acpi_os_printf);
223
224 void acpi_os_vprintf(const char *fmt, va_list args)
225 {
226         static char buffer[512];
227
228         vsprintf(buffer, fmt, args);
229
230 #ifdef ENABLE_DEBUGGER
231         if (acpi_in_debugger) {
232                 kdb_printf("%s", buffer);
233         } else {
234                 printk("%s", buffer);
235         }
236 #else
237         printk("%s", buffer);
238 #endif
239 }
240
241 acpi_physical_address __init acpi_os_get_root_pointer(void)
242 {
243         if (efi_enabled) {
244                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
245                         return efi.acpi20;
246                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
247                         return efi.acpi;
248                 else {
249                         printk(KERN_ERR PREFIX
250                                "System description tables not found\n");
251                         return 0;
252                 }
253         } else
254                 return acpi_find_rsdp();
255 }
256
257 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
258 {
259         if (phys > ULONG_MAX) {
260                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
261                 return NULL;
262         }
263         if (acpi_gbl_permanent_mmap)
264                 /*
265                 * ioremap checks to ensure this is in reserved space
266                 */
267                 return ioremap((unsigned long)phys, size);
268         else
269                 return __acpi_map_table((unsigned long)phys, size);
270 }
271 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
272
273 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
274 {
275         if (acpi_gbl_permanent_mmap) {
276                 iounmap(virt);
277         }
278 }
279 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
280
281 #ifdef ACPI_FUTURE_USAGE
282 acpi_status
283 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
284 {
285         if (!phys || !virt)
286                 return AE_BAD_PARAMETER;
287
288         *phys = virt_to_phys(virt);
289
290         return AE_OK;
291 }
292 #endif
293
294 #define ACPI_MAX_OVERRIDE_LEN 100
295
296 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
297
298 acpi_status
299 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
300                             acpi_string * new_val)
301 {
302         if (!init_val || !new_val)
303                 return AE_BAD_PARAMETER;
304
305         *new_val = NULL;
306         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
307                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
308                        acpi_os_name);
309                 *new_val = acpi_os_name;
310         }
311
312         return AE_OK;
313 }
314
315 acpi_status
316 acpi_os_table_override(struct acpi_table_header * existing_table,
317                        struct acpi_table_header ** new_table)
318 {
319         if (!existing_table || !new_table)
320                 return AE_BAD_PARAMETER;
321
322 #ifdef CONFIG_ACPI_CUSTOM_DSDT
323         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
324                 *new_table = (struct acpi_table_header *)AmlCode;
325         else
326                 *new_table = NULL;
327 #else
328         *new_table = NULL;
329 #endif
330         return AE_OK;
331 }
332
333 static irqreturn_t acpi_irq(int irq, void *dev_id)
334 {
335         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
336 }
337
338 acpi_status
339 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
340                                   void *context)
341 {
342         unsigned int irq;
343
344         /*
345          * Ignore the GSI from the core, and use the value in our copy of the
346          * FADT. It may not be the same if an interrupt source override exists
347          * for the SCI.
348          */
349         gsi = acpi_gbl_FADT.sci_interrupt;
350         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
351                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
352                        gsi);
353                 return AE_OK;
354         }
355
356         acpi_irq_handler = handler;
357         acpi_irq_context = context;
358         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
359                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
360                 return AE_NOT_ACQUIRED;
361         }
362         acpi_irq_irq = irq;
363
364         return AE_OK;
365 }
366
367 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
368 {
369         if (irq) {
370                 free_irq(irq, acpi_irq);
371                 acpi_irq_handler = NULL;
372                 acpi_irq_irq = 0;
373         }
374
375         return AE_OK;
376 }
377
378 /*
379  * Running in interpreter thread context, safe to sleep
380  */
381
382 void acpi_os_sleep(acpi_integer ms)
383 {
384         schedule_timeout_interruptible(msecs_to_jiffies(ms));
385 }
386
387 EXPORT_SYMBOL(acpi_os_sleep);
388
389 void acpi_os_stall(u32 us)
390 {
391         while (us) {
392                 u32 delay = 1000;
393
394                 if (delay > us)
395                         delay = us;
396                 udelay(delay);
397                 touch_nmi_watchdog();
398                 us -= delay;
399         }
400 }
401
402 EXPORT_SYMBOL(acpi_os_stall);
403
404 /*
405  * Support ACPI 3.0 AML Timer operand
406  * Returns 64-bit free-running, monotonically increasing timer
407  * with 100ns granularity
408  */
409 u64 acpi_os_get_timer(void)
410 {
411         static u64 t;
412
413 #ifdef  CONFIG_HPET
414         /* TBD: use HPET if available */
415 #endif
416
417 #ifdef  CONFIG_X86_PM_TIMER
418         /* TBD: default to PM timer if HPET was not available */
419 #endif
420         if (!t)
421                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
422
423         return ++t;
424 }
425
426 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
427 {
428         u32 dummy;
429
430         if (!value)
431                 value = &dummy;
432
433         *value = 0;
434         if (width <= 8) {
435                 *(u8 *) value = inb(port);
436         } else if (width <= 16) {
437                 *(u16 *) value = inw(port);
438         } else if (width <= 32) {
439                 *(u32 *) value = inl(port);
440         } else {
441                 BUG();
442         }
443
444         return AE_OK;
445 }
446
447 EXPORT_SYMBOL(acpi_os_read_port);
448
449 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
450 {
451         if (width <= 8) {
452                 outb(value, port);
453         } else if (width <= 16) {
454                 outw(value, port);
455         } else if (width <= 32) {
456                 outl(value, port);
457         } else {
458                 BUG();
459         }
460
461         return AE_OK;
462 }
463
464 EXPORT_SYMBOL(acpi_os_write_port);
465
466 acpi_status
467 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
468 {
469         u32 dummy;
470         void __iomem *virt_addr;
471
472         virt_addr = ioremap(phys_addr, width);
473         if (!value)
474                 value = &dummy;
475
476         switch (width) {
477         case 8:
478                 *(u8 *) value = readb(virt_addr);
479                 break;
480         case 16:
481                 *(u16 *) value = readw(virt_addr);
482                 break;
483         case 32:
484                 *(u32 *) value = readl(virt_addr);
485                 break;
486         default:
487                 BUG();
488         }
489
490         iounmap(virt_addr);
491
492         return AE_OK;
493 }
494
495 acpi_status
496 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
497 {
498         void __iomem *virt_addr;
499
500         virt_addr = ioremap(phys_addr, width);
501
502         switch (width) {
503         case 8:
504                 writeb(value, virt_addr);
505                 break;
506         case 16:
507                 writew(value, virt_addr);
508                 break;
509         case 32:
510                 writel(value, virt_addr);
511                 break;
512         default:
513                 BUG();
514         }
515
516         iounmap(virt_addr);
517
518         return AE_OK;
519 }
520
521 acpi_status
522 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
523                                void *value, u32 width)
524 {
525         int result, size;
526
527         if (!value)
528                 return AE_BAD_PARAMETER;
529
530         switch (width) {
531         case 8:
532                 size = 1;
533                 break;
534         case 16:
535                 size = 2;
536                 break;
537         case 32:
538                 size = 4;
539                 break;
540         default:
541                 return AE_ERROR;
542         }
543
544         BUG_ON(!raw_pci_ops);
545
546         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
547                                    PCI_DEVFN(pci_id->device, pci_id->function),
548                                    reg, size, value);
549
550         return (result ? AE_ERROR : AE_OK);
551 }
552
553 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
554
555 acpi_status
556 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
557                                 acpi_integer value, u32 width)
558 {
559         int result, size;
560
561         switch (width) {
562         case 8:
563                 size = 1;
564                 break;
565         case 16:
566                 size = 2;
567                 break;
568         case 32:
569                 size = 4;
570                 break;
571         default:
572                 return AE_ERROR;
573         }
574
575         BUG_ON(!raw_pci_ops);
576
577         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
578                                     PCI_DEVFN(pci_id->device, pci_id->function),
579                                     reg, size, value);
580
581         return (result ? AE_ERROR : AE_OK);
582 }
583
584 /* TODO: Change code to take advantage of driver model more */
585 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
586                                     acpi_handle chandle,        /* current node */
587                                     struct acpi_pci_id **id,
588                                     int *is_bridge, u8 * bus_number)
589 {
590         acpi_handle handle;
591         struct acpi_pci_id *pci_id = *id;
592         acpi_status status;
593         unsigned long temp;
594         acpi_object_type type;
595         u8 tu8;
596
597         acpi_get_parent(chandle, &handle);
598         if (handle != rhandle) {
599                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
600                                         bus_number);
601
602                 status = acpi_get_type(handle, &type);
603                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
604                         return;
605
606                 status =
607                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
608                                           &temp);
609                 if (ACPI_SUCCESS(status)) {
610                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
611                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
612
613                         if (*is_bridge)
614                                 pci_id->bus = *bus_number;
615
616                         /* any nicer way to get bus number of bridge ? */
617                         status =
618                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
619                                                            8);
620                         if (ACPI_SUCCESS(status)
621                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
622                                 status =
623                                     acpi_os_read_pci_configuration(pci_id, 0x18,
624                                                                    &tu8, 8);
625                                 if (!ACPI_SUCCESS(status)) {
626                                         /* Certainly broken...  FIX ME */
627                                         return;
628                                 }
629                                 *is_bridge = 1;
630                                 pci_id->bus = tu8;
631                                 status =
632                                     acpi_os_read_pci_configuration(pci_id, 0x19,
633                                                                    &tu8, 8);
634                                 if (ACPI_SUCCESS(status)) {
635                                         *bus_number = tu8;
636                                 }
637                         } else
638                                 *is_bridge = 0;
639                 }
640         }
641 }
642
643 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
644                            acpi_handle chandle, /* current node */
645                            struct acpi_pci_id **id)
646 {
647         int is_bridge = 1;
648         u8 bus_number = (*id)->bus;
649
650         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
651 }
652
653 static void acpi_os_execute_deferred(struct work_struct *work)
654 {
655         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
656         if (!dpc) {
657                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
658                 return;
659         }
660
661         dpc->function(dpc->context);
662         kfree(dpc);
663
664         /* Yield cpu to notify thread */
665         cond_resched();
666
667         return;
668 }
669
670 static void acpi_os_execute_notify(struct work_struct *work)
671 {
672         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
673
674         if (!dpc) {
675                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
676                 return;
677         }
678
679         dpc->function(dpc->context);
680
681         kfree(dpc);
682
683         return;
684 }
685
686 /*******************************************************************************
687  *
688  * FUNCTION:    acpi_os_execute
689  *
690  * PARAMETERS:  Type               - Type of the callback
691  *              Function           - Function to be executed
692  *              Context            - Function parameters
693  *
694  * RETURN:      Status
695  *
696  * DESCRIPTION: Depending on type, either queues function for deferred execution or
697  *              immediately executes function on a separate thread.
698  *
699  ******************************************************************************/
700
701 acpi_status acpi_os_execute(acpi_execute_type type,
702                             acpi_osd_exec_callback function, void *context)
703 {
704         acpi_status status = AE_OK;
705         struct acpi_os_dpc *dpc;
706
707         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
708                           "Scheduling function [%p(%p)] for deferred execution.\n",
709                           function, context));
710
711         if (!function)
712                 return AE_BAD_PARAMETER;
713
714         /*
715          * Allocate/initialize DPC structure.  Note that this memory will be
716          * freed by the callee.  The kernel handles the work_struct list  in a
717          * way that allows us to also free its memory inside the callee.
718          * Because we may want to schedule several tasks with different
719          * parameters we can't use the approach some kernel code uses of
720          * having a static work_struct.
721          */
722
723         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
724         if (!dpc)
725                 return_ACPI_STATUS(AE_NO_MEMORY);
726
727         dpc->function = function;
728         dpc->context = context;
729
730         if (type == OSL_NOTIFY_HANDLER) {
731                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
732                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
733                         status = AE_ERROR;
734                         kfree(dpc);
735                 }
736         } else {
737                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
738                 if (!queue_work(kacpid_wq, &dpc->work)) {
739                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
740                                   "Call to queue_work() failed.\n"));
741                         status = AE_ERROR;
742                         kfree(dpc);
743                 }
744         }
745         return_ACPI_STATUS(status);
746 }
747
748 EXPORT_SYMBOL(acpi_os_execute);
749
750 void acpi_os_wait_events_complete(void *context)
751 {
752         flush_workqueue(kacpid_wq);
753 }
754
755 EXPORT_SYMBOL(acpi_os_wait_events_complete);
756
757 /*
758  * Allocate the memory for a spinlock and initialize it.
759  */
760 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
761 {
762         spin_lock_init(*handle);
763
764         return AE_OK;
765 }
766
767 /*
768  * Deallocate the memory for a spinlock.
769  */
770 void acpi_os_delete_lock(acpi_spinlock handle)
771 {
772         return;
773 }
774
775 acpi_status
776 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
777 {
778         struct semaphore *sem = NULL;
779
780
781         sem = acpi_os_allocate(sizeof(struct semaphore));
782         if (!sem)
783                 return AE_NO_MEMORY;
784         memset(sem, 0, sizeof(struct semaphore));
785
786         sema_init(sem, initial_units);
787
788         *handle = (acpi_handle *) sem;
789
790         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
791                           *handle, initial_units));
792
793         return AE_OK;
794 }
795
796 EXPORT_SYMBOL(acpi_os_create_semaphore);
797
798 /*
799  * TODO: A better way to delete semaphores?  Linux doesn't have a
800  * 'delete_semaphore()' function -- may result in an invalid
801  * pointer dereference for non-synchronized consumers.  Should
802  * we at least check for blocked threads and signal/cancel them?
803  */
804
805 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
806 {
807         struct semaphore *sem = (struct semaphore *)handle;
808
809
810         if (!sem)
811                 return AE_BAD_PARAMETER;
812
813         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
814
815         kfree(sem);
816         sem = NULL;
817
818         return AE_OK;
819 }
820
821 EXPORT_SYMBOL(acpi_os_delete_semaphore);
822
823 /*
824  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
825  * improvise.  The process is to sleep for one scheduler quantum
826  * until the semaphore becomes available.  Downside is that this
827  * may result in starvation for timeout-based waits when there's
828  * lots of semaphore activity.
829  *
830  * TODO: Support for units > 1?
831  */
832 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
833 {
834         acpi_status status = AE_OK;
835         struct semaphore *sem = (struct semaphore *)handle;
836         int ret = 0;
837
838
839         if (!sem || (units < 1))
840                 return AE_BAD_PARAMETER;
841
842         if (units > 1)
843                 return AE_SUPPORT;
844
845         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
846                           handle, units, timeout));
847
848         /*
849          * This can be called during resume with interrupts off.
850          * Like boot-time, we should be single threaded and will
851          * always get the lock if we try -- timeout or not.
852          * If this doesn't succeed, then we will oops courtesy of
853          * might_sleep() in down().
854          */
855         if (!down_trylock(sem))
856                 return AE_OK;
857
858         switch (timeout) {
859                 /*
860                  * No Wait:
861                  * --------
862                  * A zero timeout value indicates that we shouldn't wait - just
863                  * acquire the semaphore if available otherwise return AE_TIME
864                  * (a.k.a. 'would block').
865                  */
866         case 0:
867                 if (down_trylock(sem))
868                         status = AE_TIME;
869                 break;
870
871                 /*
872                  * Wait Indefinitely:
873                  * ------------------
874                  */
875         case ACPI_WAIT_FOREVER:
876                 down(sem);
877                 break;
878
879                 /*
880                  * Wait w/ Timeout:
881                  * ----------------
882                  */
883         default:
884                 // TODO: A better timeout algorithm?
885                 {
886                         int i = 0;
887                         static const int quantum_ms = 1000 / HZ;
888
889                         ret = down_trylock(sem);
890                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
891                                 schedule_timeout_interruptible(1);
892                                 ret = down_trylock(sem);
893                         }
894
895                         if (ret != 0)
896                                 status = AE_TIME;
897                 }
898                 break;
899         }
900
901         if (ACPI_FAILURE(status)) {
902                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
903                                   "Failed to acquire semaphore[%p|%d|%d], %s",
904                                   handle, units, timeout,
905                                   acpi_format_exception(status)));
906         } else {
907                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
908                                   "Acquired semaphore[%p|%d|%d]", handle,
909                                   units, timeout));
910         }
911
912         return status;
913 }
914
915 EXPORT_SYMBOL(acpi_os_wait_semaphore);
916
917 /*
918  * TODO: Support for units > 1?
919  */
920 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
921 {
922         struct semaphore *sem = (struct semaphore *)handle;
923
924
925         if (!sem || (units < 1))
926                 return AE_BAD_PARAMETER;
927
928         if (units > 1)
929                 return AE_SUPPORT;
930
931         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
932                           units));
933
934         up(sem);
935
936         return AE_OK;
937 }
938
939 EXPORT_SYMBOL(acpi_os_signal_semaphore);
940
941 #ifdef ACPI_FUTURE_USAGE
942 u32 acpi_os_get_line(char *buffer)
943 {
944
945 #ifdef ENABLE_DEBUGGER
946         if (acpi_in_debugger) {
947                 u32 chars;
948
949                 kdb_read(buffer, sizeof(line_buf));
950
951                 /* remove the CR kdb includes */
952                 chars = strlen(buffer) - 1;
953                 buffer[chars] = '\0';
954         }
955 #endif
956
957         return 0;
958 }
959 #endif                          /*  ACPI_FUTURE_USAGE  */
960
961 acpi_status acpi_os_signal(u32 function, void *info)
962 {
963         switch (function) {
964         case ACPI_SIGNAL_FATAL:
965                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
966                 break;
967         case ACPI_SIGNAL_BREAKPOINT:
968                 /*
969                  * AML Breakpoint
970                  * ACPI spec. says to treat it as a NOP unless
971                  * you are debugging.  So if/when we integrate
972                  * AML debugger into the kernel debugger its
973                  * hook will go here.  But until then it is
974                  * not useful to print anything on breakpoints.
975                  */
976                 break;
977         default:
978                 break;
979         }
980
981         return AE_OK;
982 }
983
984 EXPORT_SYMBOL(acpi_os_signal);
985
986 static int __init acpi_os_name_setup(char *str)
987 {
988         char *p = acpi_os_name;
989         int count = ACPI_MAX_OVERRIDE_LEN - 1;
990
991         if (!str || !*str)
992                 return 0;
993
994         for (; count-- && str && *str; str++) {
995                 if (isalnum(*str) || *str == ' ' || *str == ':')
996                         *p++ = *str;
997                 else if (*str == '\'' || *str == '"')
998                         continue;
999                 else
1000                         break;
1001         }
1002         *p = 0;
1003
1004         return 1;
1005
1006 }
1007
1008 __setup("acpi_os_name=", acpi_os_name_setup);
1009
1010 static void __init set_osi_linux(unsigned int enable)
1011 {
1012         if (osi_linux.enable != enable) {
1013                 osi_linux.enable = enable;
1014                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1015                         enable ? "Add": "Delet");
1016         }
1017         return;
1018 }
1019
1020 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1021 {
1022         osi_linux.cmdline = 1;  /* cmdline set the default */
1023         set_osi_linux(enable);
1024
1025         return;
1026 }
1027
1028 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1029 {
1030         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1031
1032         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1033
1034         if (enable == -1)
1035                 return;
1036
1037         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1038
1039         set_osi_linux(enable);
1040
1041         return;
1042 }
1043
1044 /*
1045  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1046  *
1047  * empty string disables _OSI
1048  * string starting with '!' disables that string
1049  * otherwise string is added to list, augmenting built-in strings
1050  */
1051 static int __init acpi_osi_setup(char *str)
1052 {
1053         if (str == NULL || *str == '\0') {
1054                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1055                 acpi_gbl_create_osi_method = FALSE;
1056         } else if (!strcmp("!Linux", str)) {
1057                 acpi_cmdline_osi_linux(0);      /* !enable */
1058         } else if (*str == '!') {
1059                 if (acpi_osi_invalidate(++str) == AE_OK)
1060                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1061         } else if (!strcmp("Linux", str)) {
1062                 acpi_cmdline_osi_linux(1);      /* enable */
1063         } else if (*osi_additional_string == '\0') {
1064                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1065                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1066         }
1067
1068         return 1;
1069 }
1070
1071 __setup("acpi_osi=", acpi_osi_setup);
1072
1073 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1074 static int __init acpi_serialize_setup(char *str)
1075 {
1076         printk(KERN_INFO PREFIX "serialize enabled\n");
1077
1078         acpi_gbl_all_methods_serialized = TRUE;
1079
1080         return 1;
1081 }
1082
1083 __setup("acpi_serialize", acpi_serialize_setup);
1084
1085 /*
1086  * Wake and Run-Time GPES are expected to be separate.
1087  * We disable wake-GPEs at run-time to prevent spurious
1088  * interrupts.
1089  *
1090  * However, if a system exists that shares Wake and
1091  * Run-time events on the same GPE this flag is available
1092  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1093  */
1094 static int __init acpi_wake_gpes_always_on_setup(char *str)
1095 {
1096         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1097
1098         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1099
1100         return 1;
1101 }
1102
1103 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1104
1105 /*
1106  * Acquire a spinlock.
1107  *
1108  * handle is a pointer to the spinlock_t.
1109  */
1110
1111 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1112 {
1113         acpi_cpu_flags flags;
1114         spin_lock_irqsave(lockp, flags);
1115         return flags;
1116 }
1117
1118 /*
1119  * Release a spinlock. See above.
1120  */
1121
1122 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1123 {
1124         spin_unlock_irqrestore(lockp, flags);
1125 }
1126
1127 #ifndef ACPI_USE_LOCAL_CACHE
1128
1129 /*******************************************************************************
1130  *
1131  * FUNCTION:    acpi_os_create_cache
1132  *
1133  * PARAMETERS:  name      - Ascii name for the cache
1134  *              size      - Size of each cached object
1135  *              depth     - Maximum depth of the cache (in objects) <ignored>
1136  *              cache     - Where the new cache object is returned
1137  *
1138  * RETURN:      status
1139  *
1140  * DESCRIPTION: Create a cache object
1141  *
1142  ******************************************************************************/
1143
1144 acpi_status
1145 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1146 {
1147         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1148         if (*cache == NULL)
1149                 return AE_ERROR;
1150         else
1151                 return AE_OK;
1152 }
1153
1154 /*******************************************************************************
1155  *
1156  * FUNCTION:    acpi_os_purge_cache
1157  *
1158  * PARAMETERS:  Cache           - Handle to cache object
1159  *
1160  * RETURN:      Status
1161  *
1162  * DESCRIPTION: Free all objects within the requested cache.
1163  *
1164  ******************************************************************************/
1165
1166 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1167 {
1168         kmem_cache_shrink(cache);
1169         return (AE_OK);
1170 }
1171
1172 /*******************************************************************************
1173  *
1174  * FUNCTION:    acpi_os_delete_cache
1175  *
1176  * PARAMETERS:  Cache           - Handle to cache object
1177  *
1178  * RETURN:      Status
1179  *
1180  * DESCRIPTION: Free all objects within the requested cache and delete the
1181  *              cache object.
1182  *
1183  ******************************************************************************/
1184
1185 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1186 {
1187         kmem_cache_destroy(cache);
1188         return (AE_OK);
1189 }
1190
1191 /*******************************************************************************
1192  *
1193  * FUNCTION:    acpi_os_release_object
1194  *
1195  * PARAMETERS:  Cache       - Handle to cache object
1196  *              Object      - The object to be released
1197  *
1198  * RETURN:      None
1199  *
1200  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1201  *              the object is deleted.
1202  *
1203  ******************************************************************************/
1204
1205 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1206 {
1207         kmem_cache_free(cache, object);
1208         return (AE_OK);
1209 }
1210
1211 /**
1212  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1213  *
1214  *      Returns 0 on success
1215  */
1216 int acpi_dmi_dump(void)
1217 {
1218
1219         if (!dmi_available)
1220                 return -1;
1221
1222         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1223                 dmi_get_slot(DMI_SYS_VENDOR));
1224         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1225                 dmi_get_slot(DMI_PRODUCT_NAME));
1226         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1227                 dmi_get_slot(DMI_PRODUCT_VERSION));
1228         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1229                 dmi_get_slot(DMI_BOARD_NAME));
1230         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1231                 dmi_get_slot(DMI_BIOS_VENDOR));
1232         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1233                 dmi_get_slot(DMI_BIOS_DATE));
1234
1235         return 0;
1236 }
1237
1238
1239 /******************************************************************************
1240  *
1241  * FUNCTION:    acpi_os_validate_interface
1242  *
1243  * PARAMETERS:  interface           - Requested interface to be validated
1244  *
1245  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1246  *
1247  * DESCRIPTION: Match an interface string to the interfaces supported by the
1248  *              host. Strings originate from an AML call to the _OSI method.
1249  *
1250  *****************************************************************************/
1251
1252 acpi_status
1253 acpi_os_validate_interface (char *interface)
1254 {
1255         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1256                 return AE_OK;
1257         if (!strcmp("Linux", interface)) {
1258
1259                 printk(KERN_NOTICE PREFIX
1260                         "BIOS _OSI(Linux) query %s%s\n",
1261                         osi_linux.enable ? "honored" : "ignored",
1262                         osi_linux.cmdline ? " via cmdline" :
1263                         osi_linux.dmi ? " via DMI" : "");
1264
1265                 if (!osi_linux.dmi) {
1266                         if (acpi_dmi_dump())
1267                                 printk(KERN_NOTICE PREFIX
1268                                         "[please extract dmidecode output]\n");
1269                         printk(KERN_NOTICE PREFIX
1270                                 "Please send DMI info above to "
1271                                 "linux-acpi@vger.kernel.org\n");
1272                 }
1273                 if (!osi_linux.known && !osi_linux.cmdline) {
1274                         printk(KERN_NOTICE PREFIX
1275                                 "If \"acpi_osi=%sLinux\" works better, "
1276                                 "please notify linux-acpi@vger.kernel.org\n",
1277                                 osi_linux.enable ? "!" : "");
1278                 }
1279
1280                 if (osi_linux.enable)
1281                         return AE_OK;
1282         }
1283         return AE_SUPPORT;
1284 }
1285
1286 /******************************************************************************
1287  *
1288  * FUNCTION:    acpi_os_validate_address
1289  *
1290  * PARAMETERS:  space_id             - ACPI space ID
1291  *              address             - Physical address
1292  *              length              - Address length
1293  *
1294  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1295  *              should return AE_AML_ILLEGAL_ADDRESS.
1296  *
1297  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1298  *              the addresses accessed by AML operation regions.
1299  *
1300  *****************************************************************************/
1301
1302 acpi_status
1303 acpi_os_validate_address (
1304     u8                   space_id,
1305     acpi_physical_address   address,
1306     acpi_size               length)
1307 {
1308
1309     return AE_OK;
1310 }
1311
1312 #endif