Merge branches 'release' and 'stats' into release
[sfrench/cifs-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 static 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                 acpi_physical_address pa = 0;
255
256                 acpi_find_root_pointer(&pa);
257                 return pa;
258         }
259 }
260
261 void __iomem *__init_refok
262 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
263 {
264         if (phys > ULONG_MAX) {
265                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
266                 return NULL;
267         }
268         if (acpi_gbl_permanent_mmap)
269                 /*
270                 * ioremap checks to ensure this is in reserved space
271                 */
272                 return ioremap((unsigned long)phys, size);
273         else
274                 return __acpi_map_table((unsigned long)phys, size);
275 }
276 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
277
278 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
279 {
280         if (acpi_gbl_permanent_mmap) {
281                 iounmap(virt);
282         }
283 }
284 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
285
286 #ifdef ACPI_FUTURE_USAGE
287 acpi_status
288 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
289 {
290         if (!phys || !virt)
291                 return AE_BAD_PARAMETER;
292
293         *phys = virt_to_phys(virt);
294
295         return AE_OK;
296 }
297 #endif
298
299 #define ACPI_MAX_OVERRIDE_LEN 100
300
301 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
302
303 acpi_status
304 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
305                             acpi_string * new_val)
306 {
307         if (!init_val || !new_val)
308                 return AE_BAD_PARAMETER;
309
310         *new_val = NULL;
311         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
312                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
313                        acpi_os_name);
314                 *new_val = acpi_os_name;
315         }
316
317         return AE_OK;
318 }
319
320 acpi_status
321 acpi_os_table_override(struct acpi_table_header * existing_table,
322                        struct acpi_table_header ** new_table)
323 {
324         if (!existing_table || !new_table)
325                 return AE_BAD_PARAMETER;
326
327 #ifdef CONFIG_ACPI_CUSTOM_DSDT
328         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
329                 *new_table = (struct acpi_table_header *)AmlCode;
330         else
331                 *new_table = NULL;
332 #else
333         *new_table = NULL;
334 #endif
335         return AE_OK;
336 }
337
338 static irqreturn_t acpi_irq(int irq, void *dev_id)
339 {
340         u32 handled;
341
342         handled = (*acpi_irq_handler) (acpi_irq_context);
343
344         if (handled) {
345                 acpi_irq_handled++;
346                 return IRQ_HANDLED;
347         } else
348                 return IRQ_NONE;
349 }
350
351 acpi_status
352 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
353                                   void *context)
354 {
355         unsigned int irq;
356
357         acpi_irq_stats_init();
358
359         /*
360          * Ignore the GSI from the core, and use the value in our copy of the
361          * FADT. It may not be the same if an interrupt source override exists
362          * for the SCI.
363          */
364         gsi = acpi_gbl_FADT.sci_interrupt;
365         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
366                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
367                        gsi);
368                 return AE_OK;
369         }
370
371         acpi_irq_handler = handler;
372         acpi_irq_context = context;
373         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
374                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
375                 return AE_NOT_ACQUIRED;
376         }
377         acpi_irq_irq = irq;
378
379         return AE_OK;
380 }
381
382 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
383 {
384         if (irq) {
385                 free_irq(irq, acpi_irq);
386                 acpi_irq_handler = NULL;
387                 acpi_irq_irq = 0;
388         }
389
390         return AE_OK;
391 }
392
393 /*
394  * Running in interpreter thread context, safe to sleep
395  */
396
397 void acpi_os_sleep(acpi_integer ms)
398 {
399         schedule_timeout_interruptible(msecs_to_jiffies(ms));
400 }
401
402 EXPORT_SYMBOL(acpi_os_sleep);
403
404 void acpi_os_stall(u32 us)
405 {
406         while (us) {
407                 u32 delay = 1000;
408
409                 if (delay > us)
410                         delay = us;
411                 udelay(delay);
412                 touch_nmi_watchdog();
413                 us -= delay;
414         }
415 }
416
417 EXPORT_SYMBOL(acpi_os_stall);
418
419 /*
420  * Support ACPI 3.0 AML Timer operand
421  * Returns 64-bit free-running, monotonically increasing timer
422  * with 100ns granularity
423  */
424 u64 acpi_os_get_timer(void)
425 {
426         static u64 t;
427
428 #ifdef  CONFIG_HPET
429         /* TBD: use HPET if available */
430 #endif
431
432 #ifdef  CONFIG_X86_PM_TIMER
433         /* TBD: default to PM timer if HPET was not available */
434 #endif
435         if (!t)
436                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
437
438         return ++t;
439 }
440
441 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
442 {
443         u32 dummy;
444
445         if (!value)
446                 value = &dummy;
447
448         *value = 0;
449         if (width <= 8) {
450                 *(u8 *) value = inb(port);
451         } else if (width <= 16) {
452                 *(u16 *) value = inw(port);
453         } else if (width <= 32) {
454                 *(u32 *) value = inl(port);
455         } else {
456                 BUG();
457         }
458
459         return AE_OK;
460 }
461
462 EXPORT_SYMBOL(acpi_os_read_port);
463
464 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
465 {
466         if (width <= 8) {
467                 outb(value, port);
468         } else if (width <= 16) {
469                 outw(value, port);
470         } else if (width <= 32) {
471                 outl(value, port);
472         } else {
473                 BUG();
474         }
475
476         return AE_OK;
477 }
478
479 EXPORT_SYMBOL(acpi_os_write_port);
480
481 acpi_status
482 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
483 {
484         u32 dummy;
485         void __iomem *virt_addr;
486
487         virt_addr = ioremap(phys_addr, width);
488         if (!value)
489                 value = &dummy;
490
491         switch (width) {
492         case 8:
493                 *(u8 *) value = readb(virt_addr);
494                 break;
495         case 16:
496                 *(u16 *) value = readw(virt_addr);
497                 break;
498         case 32:
499                 *(u32 *) value = readl(virt_addr);
500                 break;
501         default:
502                 BUG();
503         }
504
505         iounmap(virt_addr);
506
507         return AE_OK;
508 }
509
510 acpi_status
511 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
512 {
513         void __iomem *virt_addr;
514
515         virt_addr = ioremap(phys_addr, width);
516
517         switch (width) {
518         case 8:
519                 writeb(value, virt_addr);
520                 break;
521         case 16:
522                 writew(value, virt_addr);
523                 break;
524         case 32:
525                 writel(value, virt_addr);
526                 break;
527         default:
528                 BUG();
529         }
530
531         iounmap(virt_addr);
532
533         return AE_OK;
534 }
535
536 acpi_status
537 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
538                                void *value, u32 width)
539 {
540         int result, size;
541
542         if (!value)
543                 return AE_BAD_PARAMETER;
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->read(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 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
569
570 acpi_status
571 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
572                                 acpi_integer value, u32 width)
573 {
574         int result, size;
575
576         switch (width) {
577         case 8:
578                 size = 1;
579                 break;
580         case 16:
581                 size = 2;
582                 break;
583         case 32:
584                 size = 4;
585                 break;
586         default:
587                 return AE_ERROR;
588         }
589
590         BUG_ON(!raw_pci_ops);
591
592         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
593                                     PCI_DEVFN(pci_id->device, pci_id->function),
594                                     reg, size, value);
595
596         return (result ? AE_ERROR : AE_OK);
597 }
598
599 /* TODO: Change code to take advantage of driver model more */
600 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
601                                     acpi_handle chandle,        /* current node */
602                                     struct acpi_pci_id **id,
603                                     int *is_bridge, u8 * bus_number)
604 {
605         acpi_handle handle;
606         struct acpi_pci_id *pci_id = *id;
607         acpi_status status;
608         unsigned long temp;
609         acpi_object_type type;
610         u8 tu8;
611
612         acpi_get_parent(chandle, &handle);
613         if (handle != rhandle) {
614                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
615                                         bus_number);
616
617                 status = acpi_get_type(handle, &type);
618                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
619                         return;
620
621                 status =
622                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
623                                           &temp);
624                 if (ACPI_SUCCESS(status)) {
625                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
626                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
627
628                         if (*is_bridge)
629                                 pci_id->bus = *bus_number;
630
631                         /* any nicer way to get bus number of bridge ? */
632                         status =
633                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
634                                                            8);
635                         if (ACPI_SUCCESS(status)
636                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
637                                 status =
638                                     acpi_os_read_pci_configuration(pci_id, 0x18,
639                                                                    &tu8, 8);
640                                 if (!ACPI_SUCCESS(status)) {
641                                         /* Certainly broken...  FIX ME */
642                                         return;
643                                 }
644                                 *is_bridge = 1;
645                                 pci_id->bus = tu8;
646                                 status =
647                                     acpi_os_read_pci_configuration(pci_id, 0x19,
648                                                                    &tu8, 8);
649                                 if (ACPI_SUCCESS(status)) {
650                                         *bus_number = tu8;
651                                 }
652                         } else
653                                 *is_bridge = 0;
654                 }
655         }
656 }
657
658 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
659                            acpi_handle chandle, /* current node */
660                            struct acpi_pci_id **id)
661 {
662         int is_bridge = 1;
663         u8 bus_number = (*id)->bus;
664
665         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
666 }
667
668 static void acpi_os_execute_deferred(struct work_struct *work)
669 {
670         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
671         if (!dpc) {
672                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
673                 return;
674         }
675
676         dpc->function(dpc->context);
677         kfree(dpc);
678
679         return;
680 }
681
682 /*******************************************************************************
683  *
684  * FUNCTION:    acpi_os_execute
685  *
686  * PARAMETERS:  Type               - Type of the callback
687  *              Function           - Function to be executed
688  *              Context            - Function parameters
689  *
690  * RETURN:      Status
691  *
692  * DESCRIPTION: Depending on type, either queues function for deferred execution or
693  *              immediately executes function on a separate thread.
694  *
695  ******************************************************************************/
696
697 acpi_status acpi_os_execute(acpi_execute_type type,
698                             acpi_osd_exec_callback function, void *context)
699 {
700         acpi_status status = AE_OK;
701         struct acpi_os_dpc *dpc;
702         struct workqueue_struct *queue;
703         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
704                           "Scheduling function [%p(%p)] for deferred execution.\n",
705                           function, context));
706
707         if (!function)
708                 return AE_BAD_PARAMETER;
709
710         /*
711          * Allocate/initialize DPC structure.  Note that this memory will be
712          * freed by the callee.  The kernel handles the work_struct list  in a
713          * way that allows us to also free its memory inside the callee.
714          * Because we may want to schedule several tasks with different
715          * parameters we can't use the approach some kernel code uses of
716          * having a static work_struct.
717          */
718
719         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
720         if (!dpc)
721                 return_ACPI_STATUS(AE_NO_MEMORY);
722
723         dpc->function = function;
724         dpc->context = context;
725
726         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
727         queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
728         if (!queue_work(queue, &dpc->work)) {
729                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
730                           "Call to queue_work() failed.\n"));
731                 status = AE_ERROR;
732                 kfree(dpc);
733         }
734         return_ACPI_STATUS(status);
735 }
736
737 EXPORT_SYMBOL(acpi_os_execute);
738
739 void acpi_os_wait_events_complete(void *context)
740 {
741         flush_workqueue(kacpid_wq);
742 }
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 acpi_os_create_lock(acpi_spinlock * handle)
750 {
751         spin_lock_init(*handle);
752
753         return AE_OK;
754 }
755
756 /*
757  * Deallocate the memory for a spinlock.
758  */
759 void acpi_os_delete_lock(acpi_spinlock handle)
760 {
761         return;
762 }
763
764 acpi_status
765 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
766 {
767         struct semaphore *sem = NULL;
768
769
770         sem = acpi_os_allocate(sizeof(struct semaphore));
771         if (!sem)
772                 return AE_NO_MEMORY;
773         memset(sem, 0, sizeof(struct semaphore));
774
775         sema_init(sem, initial_units);
776
777         *handle = (acpi_handle *) sem;
778
779         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
780                           *handle, initial_units));
781
782         return AE_OK;
783 }
784
785 EXPORT_SYMBOL(acpi_os_create_semaphore);
786
787 /*
788  * TODO: A better way to delete semaphores?  Linux doesn't have a
789  * 'delete_semaphore()' function -- may result in an invalid
790  * pointer dereference for non-synchronized consumers.  Should
791  * we at least check for blocked threads and signal/cancel them?
792  */
793
794 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
795 {
796         struct semaphore *sem = (struct semaphore *)handle;
797
798
799         if (!sem)
800                 return AE_BAD_PARAMETER;
801
802         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
803
804         kfree(sem);
805         sem = NULL;
806
807         return AE_OK;
808 }
809
810 EXPORT_SYMBOL(acpi_os_delete_semaphore);
811
812 /*
813  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
814  * improvise.  The process is to sleep for one scheduler quantum
815  * until the semaphore becomes available.  Downside is that this
816  * may result in starvation for timeout-based waits when there's
817  * lots of semaphore activity.
818  *
819  * TODO: Support for units > 1?
820  */
821 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
822 {
823         acpi_status status = AE_OK;
824         struct semaphore *sem = (struct semaphore *)handle;
825         int ret = 0;
826
827
828         if (!sem || (units < 1))
829                 return AE_BAD_PARAMETER;
830
831         if (units > 1)
832                 return AE_SUPPORT;
833
834         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
835                           handle, units, timeout));
836
837         /*
838          * This can be called during resume with interrupts off.
839          * Like boot-time, we should be single threaded and will
840          * always get the lock if we try -- timeout or not.
841          * If this doesn't succeed, then we will oops courtesy of
842          * might_sleep() in down().
843          */
844         if (!down_trylock(sem))
845                 return AE_OK;
846
847         switch (timeout) {
848                 /*
849                  * No Wait:
850                  * --------
851                  * A zero timeout value indicates that we shouldn't wait - just
852                  * acquire the semaphore if available otherwise return AE_TIME
853                  * (a.k.a. 'would block').
854                  */
855         case 0:
856                 if (down_trylock(sem))
857                         status = AE_TIME;
858                 break;
859
860                 /*
861                  * Wait Indefinitely:
862                  * ------------------
863                  */
864         case ACPI_WAIT_FOREVER:
865                 down(sem);
866                 break;
867
868                 /*
869                  * Wait w/ Timeout:
870                  * ----------------
871                  */
872         default:
873                 // TODO: A better timeout algorithm?
874                 {
875                         int i = 0;
876                         static const int quantum_ms = 1000 / HZ;
877
878                         ret = down_trylock(sem);
879                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
880                                 schedule_timeout_interruptible(1);
881                                 ret = down_trylock(sem);
882                         }
883
884                         if (ret != 0)
885                                 status = AE_TIME;
886                 }
887                 break;
888         }
889
890         if (ACPI_FAILURE(status)) {
891                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
892                                   "Failed to acquire semaphore[%p|%d|%d], %s",
893                                   handle, units, timeout,
894                                   acpi_format_exception(status)));
895         } else {
896                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
897                                   "Acquired semaphore[%p|%d|%d]", handle,
898                                   units, timeout));
899         }
900
901         return status;
902 }
903
904 EXPORT_SYMBOL(acpi_os_wait_semaphore);
905
906 /*
907  * TODO: Support for units > 1?
908  */
909 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
910 {
911         struct semaphore *sem = (struct semaphore *)handle;
912
913
914         if (!sem || (units < 1))
915                 return AE_BAD_PARAMETER;
916
917         if (units > 1)
918                 return AE_SUPPORT;
919
920         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
921                           units));
922
923         up(sem);
924
925         return AE_OK;
926 }
927
928 EXPORT_SYMBOL(acpi_os_signal_semaphore);
929
930 #ifdef ACPI_FUTURE_USAGE
931 u32 acpi_os_get_line(char *buffer)
932 {
933
934 #ifdef ENABLE_DEBUGGER
935         if (acpi_in_debugger) {
936                 u32 chars;
937
938                 kdb_read(buffer, sizeof(line_buf));
939
940                 /* remove the CR kdb includes */
941                 chars = strlen(buffer) - 1;
942                 buffer[chars] = '\0';
943         }
944 #endif
945
946         return 0;
947 }
948 #endif                          /*  ACPI_FUTURE_USAGE  */
949
950 acpi_status acpi_os_signal(u32 function, void *info)
951 {
952         switch (function) {
953         case ACPI_SIGNAL_FATAL:
954                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
955                 break;
956         case ACPI_SIGNAL_BREAKPOINT:
957                 /*
958                  * AML Breakpoint
959                  * ACPI spec. says to treat it as a NOP unless
960                  * you are debugging.  So if/when we integrate
961                  * AML debugger into the kernel debugger its
962                  * hook will go here.  But until then it is
963                  * not useful to print anything on breakpoints.
964                  */
965                 break;
966         default:
967                 break;
968         }
969
970         return AE_OK;
971 }
972
973 EXPORT_SYMBOL(acpi_os_signal);
974
975 static int __init acpi_os_name_setup(char *str)
976 {
977         char *p = acpi_os_name;
978         int count = ACPI_MAX_OVERRIDE_LEN - 1;
979
980         if (!str || !*str)
981                 return 0;
982
983         for (; count-- && str && *str; str++) {
984                 if (isalnum(*str) || *str == ' ' || *str == ':')
985                         *p++ = *str;
986                 else if (*str == '\'' || *str == '"')
987                         continue;
988                 else
989                         break;
990         }
991         *p = 0;
992
993         return 1;
994
995 }
996
997 __setup("acpi_os_name=", acpi_os_name_setup);
998
999 static void __init set_osi_linux(unsigned int enable)
1000 {
1001         if (osi_linux.enable != enable) {
1002                 osi_linux.enable = enable;
1003                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1004                         enable ? "Add": "Delet");
1005         }
1006         return;
1007 }
1008
1009 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1010 {
1011         osi_linux.cmdline = 1;  /* cmdline set the default */
1012         set_osi_linux(enable);
1013
1014         return;
1015 }
1016
1017 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1018 {
1019         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1020
1021         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1022
1023         if (enable == -1)
1024                 return;
1025
1026         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1027
1028         set_osi_linux(enable);
1029
1030         return;
1031 }
1032
1033 /*
1034  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1035  *
1036  * empty string disables _OSI
1037  * string starting with '!' disables that string
1038  * otherwise string is added to list, augmenting built-in strings
1039  */
1040 static int __init acpi_osi_setup(char *str)
1041 {
1042         if (str == NULL || *str == '\0') {
1043                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1044                 acpi_gbl_create_osi_method = FALSE;
1045         } else if (!strcmp("!Linux", str)) {
1046                 acpi_cmdline_osi_linux(0);      /* !enable */
1047         } else if (*str == '!') {
1048                 if (acpi_osi_invalidate(++str) == AE_OK)
1049                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1050         } else if (!strcmp("Linux", str)) {
1051                 acpi_cmdline_osi_linux(1);      /* enable */
1052         } else if (*osi_additional_string == '\0') {
1053                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1054                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1055         }
1056
1057         return 1;
1058 }
1059
1060 __setup("acpi_osi=", acpi_osi_setup);
1061
1062 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1063 static int __init acpi_serialize_setup(char *str)
1064 {
1065         printk(KERN_INFO PREFIX "serialize enabled\n");
1066
1067         acpi_gbl_all_methods_serialized = TRUE;
1068
1069         return 1;
1070 }
1071
1072 __setup("acpi_serialize", acpi_serialize_setup);
1073
1074 /*
1075  * Wake and Run-Time GPES are expected to be separate.
1076  * We disable wake-GPEs at run-time to prevent spurious
1077  * interrupts.
1078  *
1079  * However, if a system exists that shares Wake and
1080  * Run-time events on the same GPE this flag is available
1081  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1082  */
1083 static int __init acpi_wake_gpes_always_on_setup(char *str)
1084 {
1085         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1086
1087         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1088
1089         return 1;
1090 }
1091
1092 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1093
1094 /*
1095  * Acquire a spinlock.
1096  *
1097  * handle is a pointer to the spinlock_t.
1098  */
1099
1100 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1101 {
1102         acpi_cpu_flags flags;
1103         spin_lock_irqsave(lockp, flags);
1104         return flags;
1105 }
1106
1107 /*
1108  * Release a spinlock. See above.
1109  */
1110
1111 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1112 {
1113         spin_unlock_irqrestore(lockp, flags);
1114 }
1115
1116 #ifndef ACPI_USE_LOCAL_CACHE
1117
1118 /*******************************************************************************
1119  *
1120  * FUNCTION:    acpi_os_create_cache
1121  *
1122  * PARAMETERS:  name      - Ascii name for the cache
1123  *              size      - Size of each cached object
1124  *              depth     - Maximum depth of the cache (in objects) <ignored>
1125  *              cache     - Where the new cache object is returned
1126  *
1127  * RETURN:      status
1128  *
1129  * DESCRIPTION: Create a cache object
1130  *
1131  ******************************************************************************/
1132
1133 acpi_status
1134 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1135 {
1136         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1137         if (*cache == NULL)
1138                 return AE_ERROR;
1139         else
1140                 return AE_OK;
1141 }
1142
1143 /*******************************************************************************
1144  *
1145  * FUNCTION:    acpi_os_purge_cache
1146  *
1147  * PARAMETERS:  Cache           - Handle to cache object
1148  *
1149  * RETURN:      Status
1150  *
1151  * DESCRIPTION: Free all objects within the requested cache.
1152  *
1153  ******************************************************************************/
1154
1155 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1156 {
1157         kmem_cache_shrink(cache);
1158         return (AE_OK);
1159 }
1160
1161 /*******************************************************************************
1162  *
1163  * FUNCTION:    acpi_os_delete_cache
1164  *
1165  * PARAMETERS:  Cache           - Handle to cache object
1166  *
1167  * RETURN:      Status
1168  *
1169  * DESCRIPTION: Free all objects within the requested cache and delete the
1170  *              cache object.
1171  *
1172  ******************************************************************************/
1173
1174 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1175 {
1176         kmem_cache_destroy(cache);
1177         return (AE_OK);
1178 }
1179
1180 /*******************************************************************************
1181  *
1182  * FUNCTION:    acpi_os_release_object
1183  *
1184  * PARAMETERS:  Cache       - Handle to cache object
1185  *              Object      - The object to be released
1186  *
1187  * RETURN:      None
1188  *
1189  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1190  *              the object is deleted.
1191  *
1192  ******************************************************************************/
1193
1194 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1195 {
1196         kmem_cache_free(cache, object);
1197         return (AE_OK);
1198 }
1199
1200 /**
1201  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1202  *
1203  *      Returns 0 on success
1204  */
1205 static int acpi_dmi_dump(void)
1206 {
1207
1208         if (!dmi_available)
1209                 return -1;
1210
1211         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1212                 dmi_get_system_info(DMI_SYS_VENDOR));
1213         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1214                 dmi_get_system_info(DMI_PRODUCT_NAME));
1215         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1216                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1217         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1218                 dmi_get_system_info(DMI_BOARD_NAME));
1219         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1220                 dmi_get_system_info(DMI_BIOS_VENDOR));
1221         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1222                 dmi_get_system_info(DMI_BIOS_DATE));
1223
1224         return 0;
1225 }
1226
1227
1228 /******************************************************************************
1229  *
1230  * FUNCTION:    acpi_os_validate_interface
1231  *
1232  * PARAMETERS:  interface           - Requested interface to be validated
1233  *
1234  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1235  *
1236  * DESCRIPTION: Match an interface string to the interfaces supported by the
1237  *              host. Strings originate from an AML call to the _OSI method.
1238  *
1239  *****************************************************************************/
1240
1241 acpi_status
1242 acpi_os_validate_interface (char *interface)
1243 {
1244         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1245                 return AE_OK;
1246         if (!strcmp("Linux", interface)) {
1247
1248                 printk(KERN_NOTICE PREFIX
1249                         "BIOS _OSI(Linux) query %s%s\n",
1250                         osi_linux.enable ? "honored" : "ignored",
1251                         osi_linux.cmdline ? " via cmdline" :
1252                         osi_linux.dmi ? " via DMI" : "");
1253
1254                 if (!osi_linux.dmi) {
1255                         if (acpi_dmi_dump())
1256                                 printk(KERN_NOTICE PREFIX
1257                                         "[please extract dmidecode output]\n");
1258                         printk(KERN_NOTICE PREFIX
1259                                 "Please send DMI info above to "
1260                                 "linux-acpi@vger.kernel.org\n");
1261                 }
1262                 if (!osi_linux.known && !osi_linux.cmdline) {
1263                         printk(KERN_NOTICE PREFIX
1264                                 "If \"acpi_osi=%sLinux\" works better, "
1265                                 "please notify linux-acpi@vger.kernel.org\n",
1266                                 osi_linux.enable ? "!" : "");
1267                 }
1268
1269                 if (osi_linux.enable)
1270                         return AE_OK;
1271         }
1272         return AE_SUPPORT;
1273 }
1274
1275 /******************************************************************************
1276  *
1277  * FUNCTION:    acpi_os_validate_address
1278  *
1279  * PARAMETERS:  space_id             - ACPI space ID
1280  *              address             - Physical address
1281  *              length              - Address length
1282  *
1283  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1284  *              should return AE_AML_ILLEGAL_ADDRESS.
1285  *
1286  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1287  *              the addresses accessed by AML operation regions.
1288  *
1289  *****************************************************************************/
1290
1291 acpi_status
1292 acpi_os_validate_address (
1293     u8                   space_id,
1294     acpi_physical_address   address,
1295     acpi_size               length)
1296 {
1297
1298     return AE_OK;
1299 }
1300
1301 #endif