]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/acpi/osl.c
Merge branches 'release' and 'gpe-ack' into release
[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 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 *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
262 {
263         if (phys > ULONG_MAX) {
264                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
265                 return NULL;
266         }
267         if (acpi_gbl_permanent_mmap)
268                 /*
269                 * ioremap checks to ensure this is in reserved space
270                 */
271                 return ioremap((unsigned long)phys, size);
272         else
273                 return __acpi_map_table((unsigned long)phys, size);
274 }
275 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
276
277 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
278 {
279         if (acpi_gbl_permanent_mmap) {
280                 iounmap(virt);
281         }
282 }
283 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
284
285 #ifdef ACPI_FUTURE_USAGE
286 acpi_status
287 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
288 {
289         if (!phys || !virt)
290                 return AE_BAD_PARAMETER;
291
292         *phys = virt_to_phys(virt);
293
294         return AE_OK;
295 }
296 #endif
297
298 #define ACPI_MAX_OVERRIDE_LEN 100
299
300 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
301
302 acpi_status
303 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
304                             acpi_string * new_val)
305 {
306         if (!init_val || !new_val)
307                 return AE_BAD_PARAMETER;
308
309         *new_val = NULL;
310         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
311                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
312                        acpi_os_name);
313                 *new_val = acpi_os_name;
314         }
315
316         return AE_OK;
317 }
318
319 acpi_status
320 acpi_os_table_override(struct acpi_table_header * existing_table,
321                        struct acpi_table_header ** new_table)
322 {
323         if (!existing_table || !new_table)
324                 return AE_BAD_PARAMETER;
325
326 #ifdef CONFIG_ACPI_CUSTOM_DSDT
327         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
328                 *new_table = (struct acpi_table_header *)AmlCode;
329         else
330                 *new_table = NULL;
331 #else
332         *new_table = NULL;
333 #endif
334         return AE_OK;
335 }
336
337 static irqreturn_t acpi_irq(int irq, void *dev_id)
338 {
339         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
340 }
341
342 acpi_status
343 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
344                                   void *context)
345 {
346         unsigned int irq;
347
348         /*
349          * Ignore the GSI from the core, and use the value in our copy of the
350          * FADT. It may not be the same if an interrupt source override exists
351          * for the SCI.
352          */
353         gsi = acpi_gbl_FADT.sci_interrupt;
354         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
355                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
356                        gsi);
357                 return AE_OK;
358         }
359
360         acpi_irq_handler = handler;
361         acpi_irq_context = context;
362         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
363                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
364                 return AE_NOT_ACQUIRED;
365         }
366         acpi_irq_irq = irq;
367
368         return AE_OK;
369 }
370
371 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
372 {
373         if (irq) {
374                 free_irq(irq, acpi_irq);
375                 acpi_irq_handler = NULL;
376                 acpi_irq_irq = 0;
377         }
378
379         return AE_OK;
380 }
381
382 /*
383  * Running in interpreter thread context, safe to sleep
384  */
385
386 void acpi_os_sleep(acpi_integer ms)
387 {
388         schedule_timeout_interruptible(msecs_to_jiffies(ms));
389 }
390
391 EXPORT_SYMBOL(acpi_os_sleep);
392
393 void acpi_os_stall(u32 us)
394 {
395         while (us) {
396                 u32 delay = 1000;
397
398                 if (delay > us)
399                         delay = us;
400                 udelay(delay);
401                 touch_nmi_watchdog();
402                 us -= delay;
403         }
404 }
405
406 EXPORT_SYMBOL(acpi_os_stall);
407
408 /*
409  * Support ACPI 3.0 AML Timer operand
410  * Returns 64-bit free-running, monotonically increasing timer
411  * with 100ns granularity
412  */
413 u64 acpi_os_get_timer(void)
414 {
415         static u64 t;
416
417 #ifdef  CONFIG_HPET
418         /* TBD: use HPET if available */
419 #endif
420
421 #ifdef  CONFIG_X86_PM_TIMER
422         /* TBD: default to PM timer if HPET was not available */
423 #endif
424         if (!t)
425                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
426
427         return ++t;
428 }
429
430 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
431 {
432         u32 dummy;
433
434         if (!value)
435                 value = &dummy;
436
437         *value = 0;
438         if (width <= 8) {
439                 *(u8 *) value = inb(port);
440         } else if (width <= 16) {
441                 *(u16 *) value = inw(port);
442         } else if (width <= 32) {
443                 *(u32 *) value = inl(port);
444         } else {
445                 BUG();
446         }
447
448         return AE_OK;
449 }
450
451 EXPORT_SYMBOL(acpi_os_read_port);
452
453 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
454 {
455         if (width <= 8) {
456                 outb(value, port);
457         } else if (width <= 16) {
458                 outw(value, port);
459         } else if (width <= 32) {
460                 outl(value, port);
461         } else {
462                 BUG();
463         }
464
465         return AE_OK;
466 }
467
468 EXPORT_SYMBOL(acpi_os_write_port);
469
470 acpi_status
471 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
472 {
473         u32 dummy;
474         void __iomem *virt_addr;
475
476         virt_addr = ioremap(phys_addr, width);
477         if (!value)
478                 value = &dummy;
479
480         switch (width) {
481         case 8:
482                 *(u8 *) value = readb(virt_addr);
483                 break;
484         case 16:
485                 *(u16 *) value = readw(virt_addr);
486                 break;
487         case 32:
488                 *(u32 *) value = readl(virt_addr);
489                 break;
490         default:
491                 BUG();
492         }
493
494         iounmap(virt_addr);
495
496         return AE_OK;
497 }
498
499 acpi_status
500 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
501 {
502         void __iomem *virt_addr;
503
504         virt_addr = ioremap(phys_addr, width);
505
506         switch (width) {
507         case 8:
508                 writeb(value, virt_addr);
509                 break;
510         case 16:
511                 writew(value, virt_addr);
512                 break;
513         case 32:
514                 writel(value, virt_addr);
515                 break;
516         default:
517                 BUG();
518         }
519
520         iounmap(virt_addr);
521
522         return AE_OK;
523 }
524
525 acpi_status
526 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
527                                void *value, u32 width)
528 {
529         int result, size;
530
531         if (!value)
532                 return AE_BAD_PARAMETER;
533
534         switch (width) {
535         case 8:
536                 size = 1;
537                 break;
538         case 16:
539                 size = 2;
540                 break;
541         case 32:
542                 size = 4;
543                 break;
544         default:
545                 return AE_ERROR;
546         }
547
548         BUG_ON(!raw_pci_ops);
549
550         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
551                                    PCI_DEVFN(pci_id->device, pci_id->function),
552                                    reg, size, value);
553
554         return (result ? AE_ERROR : AE_OK);
555 }
556
557 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
558
559 acpi_status
560 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
561                                 acpi_integer value, u32 width)
562 {
563         int result, size;
564
565         switch (width) {
566         case 8:
567                 size = 1;
568                 break;
569         case 16:
570                 size = 2;
571                 break;
572         case 32:
573                 size = 4;
574                 break;
575         default:
576                 return AE_ERROR;
577         }
578
579         BUG_ON(!raw_pci_ops);
580
581         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
582                                     PCI_DEVFN(pci_id->device, pci_id->function),
583                                     reg, size, value);
584
585         return (result ? AE_ERROR : AE_OK);
586 }
587
588 /* TODO: Change code to take advantage of driver model more */
589 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
590                                     acpi_handle chandle,        /* current node */
591                                     struct acpi_pci_id **id,
592                                     int *is_bridge, u8 * bus_number)
593 {
594         acpi_handle handle;
595         struct acpi_pci_id *pci_id = *id;
596         acpi_status status;
597         unsigned long temp;
598         acpi_object_type type;
599         u8 tu8;
600
601         acpi_get_parent(chandle, &handle);
602         if (handle != rhandle) {
603                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
604                                         bus_number);
605
606                 status = acpi_get_type(handle, &type);
607                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
608                         return;
609
610                 status =
611                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
612                                           &temp);
613                 if (ACPI_SUCCESS(status)) {
614                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
615                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
616
617                         if (*is_bridge)
618                                 pci_id->bus = *bus_number;
619
620                         /* any nicer way to get bus number of bridge ? */
621                         status =
622                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
623                                                            8);
624                         if (ACPI_SUCCESS(status)
625                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
626                                 status =
627                                     acpi_os_read_pci_configuration(pci_id, 0x18,
628                                                                    &tu8, 8);
629                                 if (!ACPI_SUCCESS(status)) {
630                                         /* Certainly broken...  FIX ME */
631                                         return;
632                                 }
633                                 *is_bridge = 1;
634                                 pci_id->bus = tu8;
635                                 status =
636                                     acpi_os_read_pci_configuration(pci_id, 0x19,
637                                                                    &tu8, 8);
638                                 if (ACPI_SUCCESS(status)) {
639                                         *bus_number = tu8;
640                                 }
641                         } else
642                                 *is_bridge = 0;
643                 }
644         }
645 }
646
647 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
648                            acpi_handle chandle, /* current node */
649                            struct acpi_pci_id **id)
650 {
651         int is_bridge = 1;
652         u8 bus_number = (*id)->bus;
653
654         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
655 }
656
657 static void acpi_os_execute_deferred(struct work_struct *work)
658 {
659         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
660         if (!dpc) {
661                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
662                 return;
663         }
664
665         dpc->function(dpc->context);
666         kfree(dpc);
667
668         return;
669 }
670
671 /*******************************************************************************
672  *
673  * FUNCTION:    acpi_os_execute
674  *
675  * PARAMETERS:  Type               - Type of the callback
676  *              Function           - Function to be executed
677  *              Context            - Function parameters
678  *
679  * RETURN:      Status
680  *
681  * DESCRIPTION: Depending on type, either queues function for deferred execution or
682  *              immediately executes function on a separate thread.
683  *
684  ******************************************************************************/
685
686 acpi_status acpi_os_execute(acpi_execute_type type,
687                             acpi_osd_exec_callback function, void *context)
688 {
689         acpi_status status = AE_OK;
690         struct acpi_os_dpc *dpc;
691         struct workqueue_struct *queue;
692         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
693                           "Scheduling function [%p(%p)] for deferred execution.\n",
694                           function, context));
695
696         if (!function)
697                 return AE_BAD_PARAMETER;
698
699         /*
700          * Allocate/initialize DPC structure.  Note that this memory will be
701          * freed by the callee.  The kernel handles the work_struct list  in a
702          * way that allows us to also free its memory inside the callee.
703          * Because we may want to schedule several tasks with different
704          * parameters we can't use the approach some kernel code uses of
705          * having a static work_struct.
706          */
707
708         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
709         if (!dpc)
710                 return_ACPI_STATUS(AE_NO_MEMORY);
711
712         dpc->function = function;
713         dpc->context = context;
714
715         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
716         queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
717         if (!queue_work(queue, &dpc->work)) {
718                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
719                           "Call to queue_work() failed.\n"));
720                 status = AE_ERROR;
721                 kfree(dpc);
722         }
723         return_ACPI_STATUS(status);
724 }
725
726 EXPORT_SYMBOL(acpi_os_execute);
727
728 void acpi_os_wait_events_complete(void *context)
729 {
730         flush_workqueue(kacpid_wq);
731 }
732
733 EXPORT_SYMBOL(acpi_os_wait_events_complete);
734
735 /*
736  * Allocate the memory for a spinlock and initialize it.
737  */
738 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
739 {
740         spin_lock_init(*handle);
741
742         return AE_OK;
743 }
744
745 /*
746  * Deallocate the memory for a spinlock.
747  */
748 void acpi_os_delete_lock(acpi_spinlock handle)
749 {
750         return;
751 }
752
753 acpi_status
754 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
755 {
756         struct semaphore *sem = NULL;
757
758
759         sem = acpi_os_allocate(sizeof(struct semaphore));
760         if (!sem)
761                 return AE_NO_MEMORY;
762         memset(sem, 0, sizeof(struct semaphore));
763
764         sema_init(sem, initial_units);
765
766         *handle = (acpi_handle *) sem;
767
768         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
769                           *handle, initial_units));
770
771         return AE_OK;
772 }
773
774 EXPORT_SYMBOL(acpi_os_create_semaphore);
775
776 /*
777  * TODO: A better way to delete semaphores?  Linux doesn't have a
778  * 'delete_semaphore()' function -- may result in an invalid
779  * pointer dereference for non-synchronized consumers.  Should
780  * we at least check for blocked threads and signal/cancel them?
781  */
782
783 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
784 {
785         struct semaphore *sem = (struct semaphore *)handle;
786
787
788         if (!sem)
789                 return AE_BAD_PARAMETER;
790
791         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
792
793         kfree(sem);
794         sem = NULL;
795
796         return AE_OK;
797 }
798
799 EXPORT_SYMBOL(acpi_os_delete_semaphore);
800
801 /*
802  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
803  * improvise.  The process is to sleep for one scheduler quantum
804  * until the semaphore becomes available.  Downside is that this
805  * may result in starvation for timeout-based waits when there's
806  * lots of semaphore activity.
807  *
808  * TODO: Support for units > 1?
809  */
810 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
811 {
812         acpi_status status = AE_OK;
813         struct semaphore *sem = (struct semaphore *)handle;
814         int ret = 0;
815
816
817         if (!sem || (units < 1))
818                 return AE_BAD_PARAMETER;
819
820         if (units > 1)
821                 return AE_SUPPORT;
822
823         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
824                           handle, units, timeout));
825
826         /*
827          * This can be called during resume with interrupts off.
828          * Like boot-time, we should be single threaded and will
829          * always get the lock if we try -- timeout or not.
830          * If this doesn't succeed, then we will oops courtesy of
831          * might_sleep() in down().
832          */
833         if (!down_trylock(sem))
834                 return AE_OK;
835
836         switch (timeout) {
837                 /*
838                  * No Wait:
839                  * --------
840                  * A zero timeout value indicates that we shouldn't wait - just
841                  * acquire the semaphore if available otherwise return AE_TIME
842                  * (a.k.a. 'would block').
843                  */
844         case 0:
845                 if (down_trylock(sem))
846                         status = AE_TIME;
847                 break;
848
849                 /*
850                  * Wait Indefinitely:
851                  * ------------------
852                  */
853         case ACPI_WAIT_FOREVER:
854                 down(sem);
855                 break;
856
857                 /*
858                  * Wait w/ Timeout:
859                  * ----------------
860                  */
861         default:
862                 // TODO: A better timeout algorithm?
863                 {
864                         int i = 0;
865                         static const int quantum_ms = 1000 / HZ;
866
867                         ret = down_trylock(sem);
868                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
869                                 schedule_timeout_interruptible(1);
870                                 ret = down_trylock(sem);
871                         }
872
873                         if (ret != 0)
874                                 status = AE_TIME;
875                 }
876                 break;
877         }
878
879         if (ACPI_FAILURE(status)) {
880                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
881                                   "Failed to acquire semaphore[%p|%d|%d], %s",
882                                   handle, units, timeout,
883                                   acpi_format_exception(status)));
884         } else {
885                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
886                                   "Acquired semaphore[%p|%d|%d]", handle,
887                                   units, timeout));
888         }
889
890         return status;
891 }
892
893 EXPORT_SYMBOL(acpi_os_wait_semaphore);
894
895 /*
896  * TODO: Support for units > 1?
897  */
898 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
899 {
900         struct semaphore *sem = (struct semaphore *)handle;
901
902
903         if (!sem || (units < 1))
904                 return AE_BAD_PARAMETER;
905
906         if (units > 1)
907                 return AE_SUPPORT;
908
909         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
910                           units));
911
912         up(sem);
913
914         return AE_OK;
915 }
916
917 EXPORT_SYMBOL(acpi_os_signal_semaphore);
918
919 #ifdef ACPI_FUTURE_USAGE
920 u32 acpi_os_get_line(char *buffer)
921 {
922
923 #ifdef ENABLE_DEBUGGER
924         if (acpi_in_debugger) {
925                 u32 chars;
926
927                 kdb_read(buffer, sizeof(line_buf));
928
929                 /* remove the CR kdb includes */
930                 chars = strlen(buffer) - 1;
931                 buffer[chars] = '\0';
932         }
933 #endif
934
935         return 0;
936 }
937 #endif                          /*  ACPI_FUTURE_USAGE  */
938
939 acpi_status acpi_os_signal(u32 function, void *info)
940 {
941         switch (function) {
942         case ACPI_SIGNAL_FATAL:
943                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
944                 break;
945         case ACPI_SIGNAL_BREAKPOINT:
946                 /*
947                  * AML Breakpoint
948                  * ACPI spec. says to treat it as a NOP unless
949                  * you are debugging.  So if/when we integrate
950                  * AML debugger into the kernel debugger its
951                  * hook will go here.  But until then it is
952                  * not useful to print anything on breakpoints.
953                  */
954                 break;
955         default:
956                 break;
957         }
958
959         return AE_OK;
960 }
961
962 EXPORT_SYMBOL(acpi_os_signal);
963
964 static int __init acpi_os_name_setup(char *str)
965 {
966         char *p = acpi_os_name;
967         int count = ACPI_MAX_OVERRIDE_LEN - 1;
968
969         if (!str || !*str)
970                 return 0;
971
972         for (; count-- && str && *str; str++) {
973                 if (isalnum(*str) || *str == ' ' || *str == ':')
974                         *p++ = *str;
975                 else if (*str == '\'' || *str == '"')
976                         continue;
977                 else
978                         break;
979         }
980         *p = 0;
981
982         return 1;
983
984 }
985
986 __setup("acpi_os_name=", acpi_os_name_setup);
987
988 static void __init set_osi_linux(unsigned int enable)
989 {
990         if (osi_linux.enable != enable) {
991                 osi_linux.enable = enable;
992                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
993                         enable ? "Add": "Delet");
994         }
995         return;
996 }
997
998 static void __init acpi_cmdline_osi_linux(unsigned int enable)
999 {
1000         osi_linux.cmdline = 1;  /* cmdline set the default */
1001         set_osi_linux(enable);
1002
1003         return;
1004 }
1005
1006 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1007 {
1008         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1009
1010         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1011
1012         if (enable == -1)
1013                 return;
1014
1015         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1016
1017         set_osi_linux(enable);
1018
1019         return;
1020 }
1021
1022 /*
1023  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1024  *
1025  * empty string disables _OSI
1026  * string starting with '!' disables that string
1027  * otherwise string is added to list, augmenting built-in strings
1028  */
1029 static int __init acpi_osi_setup(char *str)
1030 {
1031         if (str == NULL || *str == '\0') {
1032                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1033                 acpi_gbl_create_osi_method = FALSE;
1034         } else if (!strcmp("!Linux", str)) {
1035                 acpi_cmdline_osi_linux(0);      /* !enable */
1036         } else if (*str == '!') {
1037                 if (acpi_osi_invalidate(++str) == AE_OK)
1038                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1039         } else if (!strcmp("Linux", str)) {
1040                 acpi_cmdline_osi_linux(1);      /* enable */
1041         } else if (*osi_additional_string == '\0') {
1042                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1043                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1044         }
1045
1046         return 1;
1047 }
1048
1049 __setup("acpi_osi=", acpi_osi_setup);
1050
1051 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1052 static int __init acpi_serialize_setup(char *str)
1053 {
1054         printk(KERN_INFO PREFIX "serialize enabled\n");
1055
1056         acpi_gbl_all_methods_serialized = TRUE;
1057
1058         return 1;
1059 }
1060
1061 __setup("acpi_serialize", acpi_serialize_setup);
1062
1063 /*
1064  * Wake and Run-Time GPES are expected to be separate.
1065  * We disable wake-GPEs at run-time to prevent spurious
1066  * interrupts.
1067  *
1068  * However, if a system exists that shares Wake and
1069  * Run-time events on the same GPE this flag is available
1070  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1071  */
1072 static int __init acpi_wake_gpes_always_on_setup(char *str)
1073 {
1074         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1075
1076         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1077
1078         return 1;
1079 }
1080
1081 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1082
1083 /*
1084  * Acquire a spinlock.
1085  *
1086  * handle is a pointer to the spinlock_t.
1087  */
1088
1089 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1090 {
1091         acpi_cpu_flags flags;
1092         spin_lock_irqsave(lockp, flags);
1093         return flags;
1094 }
1095
1096 /*
1097  * Release a spinlock. See above.
1098  */
1099
1100 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1101 {
1102         spin_unlock_irqrestore(lockp, flags);
1103 }
1104
1105 #ifndef ACPI_USE_LOCAL_CACHE
1106
1107 /*******************************************************************************
1108  *
1109  * FUNCTION:    acpi_os_create_cache
1110  *
1111  * PARAMETERS:  name      - Ascii name for the cache
1112  *              size      - Size of each cached object
1113  *              depth     - Maximum depth of the cache (in objects) <ignored>
1114  *              cache     - Where the new cache object is returned
1115  *
1116  * RETURN:      status
1117  *
1118  * DESCRIPTION: Create a cache object
1119  *
1120  ******************************************************************************/
1121
1122 acpi_status
1123 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1124 {
1125         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1126         if (*cache == NULL)
1127                 return AE_ERROR;
1128         else
1129                 return AE_OK;
1130 }
1131
1132 /*******************************************************************************
1133  *
1134  * FUNCTION:    acpi_os_purge_cache
1135  *
1136  * PARAMETERS:  Cache           - Handle to cache object
1137  *
1138  * RETURN:      Status
1139  *
1140  * DESCRIPTION: Free all objects within the requested cache.
1141  *
1142  ******************************************************************************/
1143
1144 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1145 {
1146         kmem_cache_shrink(cache);
1147         return (AE_OK);
1148 }
1149
1150 /*******************************************************************************
1151  *
1152  * FUNCTION:    acpi_os_delete_cache
1153  *
1154  * PARAMETERS:  Cache           - Handle to cache object
1155  *
1156  * RETURN:      Status
1157  *
1158  * DESCRIPTION: Free all objects within the requested cache and delete the
1159  *              cache object.
1160  *
1161  ******************************************************************************/
1162
1163 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1164 {
1165         kmem_cache_destroy(cache);
1166         return (AE_OK);
1167 }
1168
1169 /*******************************************************************************
1170  *
1171  * FUNCTION:    acpi_os_release_object
1172  *
1173  * PARAMETERS:  Cache       - Handle to cache object
1174  *              Object      - The object to be released
1175  *
1176  * RETURN:      None
1177  *
1178  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1179  *              the object is deleted.
1180  *
1181  ******************************************************************************/
1182
1183 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1184 {
1185         kmem_cache_free(cache, object);
1186         return (AE_OK);
1187 }
1188
1189 /**
1190  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1191  *
1192  *      Returns 0 on success
1193  */
1194 static int acpi_dmi_dump(void)
1195 {
1196
1197         if (!dmi_available)
1198                 return -1;
1199
1200         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1201                 dmi_get_system_info(DMI_SYS_VENDOR));
1202         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1203                 dmi_get_system_info(DMI_PRODUCT_NAME));
1204         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1205                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1206         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1207                 dmi_get_system_info(DMI_BOARD_NAME));
1208         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1209                 dmi_get_system_info(DMI_BIOS_VENDOR));
1210         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1211                 dmi_get_system_info(DMI_BIOS_DATE));
1212
1213         return 0;
1214 }
1215
1216
1217 /******************************************************************************
1218  *
1219  * FUNCTION:    acpi_os_validate_interface
1220  *
1221  * PARAMETERS:  interface           - Requested interface to be validated
1222  *
1223  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1224  *
1225  * DESCRIPTION: Match an interface string to the interfaces supported by the
1226  *              host. Strings originate from an AML call to the _OSI method.
1227  *
1228  *****************************************************************************/
1229
1230 acpi_status
1231 acpi_os_validate_interface (char *interface)
1232 {
1233         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1234                 return AE_OK;
1235         if (!strcmp("Linux", interface)) {
1236
1237                 printk(KERN_NOTICE PREFIX
1238                         "BIOS _OSI(Linux) query %s%s\n",
1239                         osi_linux.enable ? "honored" : "ignored",
1240                         osi_linux.cmdline ? " via cmdline" :
1241                         osi_linux.dmi ? " via DMI" : "");
1242
1243                 if (!osi_linux.dmi) {
1244                         if (acpi_dmi_dump())
1245                                 printk(KERN_NOTICE PREFIX
1246                                         "[please extract dmidecode output]\n");
1247                         printk(KERN_NOTICE PREFIX
1248                                 "Please send DMI info above to "
1249                                 "linux-acpi@vger.kernel.org\n");
1250                 }
1251                 if (!osi_linux.known && !osi_linux.cmdline) {
1252                         printk(KERN_NOTICE PREFIX
1253                                 "If \"acpi_osi=%sLinux\" works better, "
1254                                 "please notify linux-acpi@vger.kernel.org\n",
1255                                 osi_linux.enable ? "!" : "");
1256                 }
1257
1258                 if (osi_linux.enable)
1259                         return AE_OK;
1260         }
1261         return AE_SUPPORT;
1262 }
1263
1264 /******************************************************************************
1265  *
1266  * FUNCTION:    acpi_os_validate_address
1267  *
1268  * PARAMETERS:  space_id             - ACPI space ID
1269  *              address             - Physical address
1270  *              length              - Address length
1271  *
1272  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1273  *              should return AE_AML_ILLEGAL_ADDRESS.
1274  *
1275  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1276  *              the addresses accessed by AML operation regions.
1277  *
1278  *****************************************************************************/
1279
1280 acpi_status
1281 acpi_os_validate_address (
1282     u8                   space_id,
1283     acpi_physical_address   address,
1284     acpi_size               length)
1285 {
1286
1287     return AE_OK;
1288 }
1289
1290 #endif