[SPARC64]: Partially revert "Constify function pointer tables."
[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 static int osi_linux;           /* disable _OSI(Linux) by default */
81
82 #ifdef CONFIG_DMI
83 static struct __initdata dmi_system_id acpi_osl_dmi_table[];
84 #endif
85
86 static void __init acpi_request_region (struct acpi_generic_address *addr,
87         unsigned int length, char *desc)
88 {
89         struct resource *res;
90
91         if (!addr->address || !length)
92                 return;
93
94         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
95                 res = request_region(addr->address, length, desc);
96         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
97                 res = request_mem_region(addr->address, length, desc);
98 }
99
100 static int __init acpi_reserve_resources(void)
101 {
102         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
103                 "ACPI PM1a_EVT_BLK");
104
105         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
106                 "ACPI PM1b_EVT_BLK");
107
108         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
109                 "ACPI PM1a_CNT_BLK");
110
111         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
112                 "ACPI PM1b_CNT_BLK");
113
114         if (acpi_gbl_FADT.pm_timer_length == 4)
115                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
116
117         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
118                 "ACPI PM2_CNT_BLK");
119
120         /* Length of GPE blocks must be a non-negative multiple of 2 */
121
122         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
123                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
124                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
125
126         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
127                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
128                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
129
130         return 0;
131 }
132 device_initcall(acpi_reserve_resources);
133
134 acpi_status __init acpi_os_initialize(void)
135 {
136         dmi_check_system(acpi_osl_dmi_table);
137         return AE_OK;
138 }
139
140 acpi_status acpi_os_initialize1(void)
141 {
142         /*
143          * Initialize PCI configuration space access, as we'll need to access
144          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
145          */
146         if (!raw_pci_ops) {
147                 printk(KERN_ERR PREFIX
148                        "Access to PCI configuration space unavailable\n");
149                 return AE_NULL_ENTRY;
150         }
151         kacpid_wq = create_singlethread_workqueue("kacpid");
152         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
153         BUG_ON(!kacpid_wq);
154         BUG_ON(!kacpi_notify_wq);
155         return AE_OK;
156 }
157
158 acpi_status acpi_os_terminate(void)
159 {
160         if (acpi_irq_handler) {
161                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
162                                                  acpi_irq_handler);
163         }
164
165         destroy_workqueue(kacpid_wq);
166         destroy_workqueue(kacpi_notify_wq);
167
168         return AE_OK;
169 }
170
171 void acpi_os_printf(const char *fmt, ...)
172 {
173         va_list args;
174         va_start(args, fmt);
175         acpi_os_vprintf(fmt, args);
176         va_end(args);
177 }
178
179 EXPORT_SYMBOL(acpi_os_printf);
180
181 void acpi_os_vprintf(const char *fmt, va_list args)
182 {
183         static char buffer[512];
184
185         vsprintf(buffer, fmt, args);
186
187 #ifdef ENABLE_DEBUGGER
188         if (acpi_in_debugger) {
189                 kdb_printf("%s", buffer);
190         } else {
191                 printk("%s", buffer);
192         }
193 #else
194         printk("%s", buffer);
195 #endif
196 }
197
198 acpi_physical_address __init acpi_os_get_root_pointer(void)
199 {
200         if (efi_enabled) {
201                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
202                         return efi.acpi20;
203                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
204                         return efi.acpi;
205                 else {
206                         printk(KERN_ERR PREFIX
207                                "System description tables not found\n");
208                         return 0;
209                 }
210         } else
211                 return acpi_find_rsdp();
212 }
213
214 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
215 {
216         if (phys > ULONG_MAX) {
217                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
218                 return NULL;
219         }
220         if (acpi_gbl_permanent_mmap)
221                 /*
222                 * ioremap checks to ensure this is in reserved space
223                 */
224                 return ioremap((unsigned long)phys, size);
225         else
226                 return __acpi_map_table((unsigned long)phys, size);
227 }
228 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
229
230 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
231 {
232         if (acpi_gbl_permanent_mmap) {
233                 iounmap(virt);
234         }
235 }
236 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
237
238 #ifdef ACPI_FUTURE_USAGE
239 acpi_status
240 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
241 {
242         if (!phys || !virt)
243                 return AE_BAD_PARAMETER;
244
245         *phys = virt_to_phys(virt);
246
247         return AE_OK;
248 }
249 #endif
250
251 #define ACPI_MAX_OVERRIDE_LEN 100
252
253 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
254
255 acpi_status
256 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
257                             acpi_string * new_val)
258 {
259         if (!init_val || !new_val)
260                 return AE_BAD_PARAMETER;
261
262         *new_val = NULL;
263         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
264                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
265                        acpi_os_name);
266                 *new_val = acpi_os_name;
267         }
268
269         return AE_OK;
270 }
271
272 acpi_status
273 acpi_os_table_override(struct acpi_table_header * existing_table,
274                        struct acpi_table_header ** new_table)
275 {
276         if (!existing_table || !new_table)
277                 return AE_BAD_PARAMETER;
278
279 #ifdef CONFIG_ACPI_CUSTOM_DSDT
280         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
281                 *new_table = (struct acpi_table_header *)AmlCode;
282         else
283                 *new_table = NULL;
284 #else
285         *new_table = NULL;
286 #endif
287         return AE_OK;
288 }
289
290 static irqreturn_t acpi_irq(int irq, void *dev_id)
291 {
292         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
293 }
294
295 acpi_status
296 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
297                                   void *context)
298 {
299         unsigned int irq;
300
301         /*
302          * Ignore the GSI from the core, and use the value in our copy of the
303          * FADT. It may not be the same if an interrupt source override exists
304          * for the SCI.
305          */
306         gsi = acpi_gbl_FADT.sci_interrupt;
307         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
308                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
309                        gsi);
310                 return AE_OK;
311         }
312
313         acpi_irq_handler = handler;
314         acpi_irq_context = context;
315         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
316                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
317                 return AE_NOT_ACQUIRED;
318         }
319         acpi_irq_irq = irq;
320
321         return AE_OK;
322 }
323
324 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
325 {
326         if (irq) {
327                 free_irq(irq, acpi_irq);
328                 acpi_irq_handler = NULL;
329                 acpi_irq_irq = 0;
330         }
331
332         return AE_OK;
333 }
334
335 /*
336  * Running in interpreter thread context, safe to sleep
337  */
338
339 void acpi_os_sleep(acpi_integer ms)
340 {
341         schedule_timeout_interruptible(msecs_to_jiffies(ms));
342 }
343
344 EXPORT_SYMBOL(acpi_os_sleep);
345
346 void acpi_os_stall(u32 us)
347 {
348         while (us) {
349                 u32 delay = 1000;
350
351                 if (delay > us)
352                         delay = us;
353                 udelay(delay);
354                 touch_nmi_watchdog();
355                 us -= delay;
356         }
357 }
358
359 EXPORT_SYMBOL(acpi_os_stall);
360
361 /*
362  * Support ACPI 3.0 AML Timer operand
363  * Returns 64-bit free-running, monotonically increasing timer
364  * with 100ns granularity
365  */
366 u64 acpi_os_get_timer(void)
367 {
368         static u64 t;
369
370 #ifdef  CONFIG_HPET
371         /* TBD: use HPET if available */
372 #endif
373
374 #ifdef  CONFIG_X86_PM_TIMER
375         /* TBD: default to PM timer if HPET was not available */
376 #endif
377         if (!t)
378                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
379
380         return ++t;
381 }
382
383 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
384 {
385         u32 dummy;
386
387         if (!value)
388                 value = &dummy;
389
390         *value = 0;
391         if (width <= 8) {
392                 *(u8 *) value = inb(port);
393         } else if (width <= 16) {
394                 *(u16 *) value = inw(port);
395         } else if (width <= 32) {
396                 *(u32 *) value = inl(port);
397         } else {
398                 BUG();
399         }
400
401         return AE_OK;
402 }
403
404 EXPORT_SYMBOL(acpi_os_read_port);
405
406 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
407 {
408         if (width <= 8) {
409                 outb(value, port);
410         } else if (width <= 16) {
411                 outw(value, port);
412         } else if (width <= 32) {
413                 outl(value, port);
414         } else {
415                 BUG();
416         }
417
418         return AE_OK;
419 }
420
421 EXPORT_SYMBOL(acpi_os_write_port);
422
423 acpi_status
424 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
425 {
426         u32 dummy;
427         void __iomem *virt_addr;
428
429         virt_addr = ioremap(phys_addr, width);
430         if (!value)
431                 value = &dummy;
432
433         switch (width) {
434         case 8:
435                 *(u8 *) value = readb(virt_addr);
436                 break;
437         case 16:
438                 *(u16 *) value = readw(virt_addr);
439                 break;
440         case 32:
441                 *(u32 *) value = readl(virt_addr);
442                 break;
443         default:
444                 BUG();
445         }
446
447         iounmap(virt_addr);
448
449         return AE_OK;
450 }
451
452 acpi_status
453 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
454 {
455         void __iomem *virt_addr;
456
457         virt_addr = ioremap(phys_addr, width);
458
459         switch (width) {
460         case 8:
461                 writeb(value, virt_addr);
462                 break;
463         case 16:
464                 writew(value, virt_addr);
465                 break;
466         case 32:
467                 writel(value, virt_addr);
468                 break;
469         default:
470                 BUG();
471         }
472
473         iounmap(virt_addr);
474
475         return AE_OK;
476 }
477
478 acpi_status
479 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
480                                void *value, u32 width)
481 {
482         int result, size;
483
484         if (!value)
485                 return AE_BAD_PARAMETER;
486
487         switch (width) {
488         case 8:
489                 size = 1;
490                 break;
491         case 16:
492                 size = 2;
493                 break;
494         case 32:
495                 size = 4;
496                 break;
497         default:
498                 return AE_ERROR;
499         }
500
501         BUG_ON(!raw_pci_ops);
502
503         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
504                                    PCI_DEVFN(pci_id->device, pci_id->function),
505                                    reg, size, value);
506
507         return (result ? AE_ERROR : AE_OK);
508 }
509
510 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
511
512 acpi_status
513 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
514                                 acpi_integer value, u32 width)
515 {
516         int result, size;
517
518         switch (width) {
519         case 8:
520                 size = 1;
521                 break;
522         case 16:
523                 size = 2;
524                 break;
525         case 32:
526                 size = 4;
527                 break;
528         default:
529                 return AE_ERROR;
530         }
531
532         BUG_ON(!raw_pci_ops);
533
534         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
535                                     PCI_DEVFN(pci_id->device, pci_id->function),
536                                     reg, size, value);
537
538         return (result ? AE_ERROR : AE_OK);
539 }
540
541 /* TODO: Change code to take advantage of driver model more */
542 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
543                                     acpi_handle chandle,        /* current node */
544                                     struct acpi_pci_id **id,
545                                     int *is_bridge, u8 * bus_number)
546 {
547         acpi_handle handle;
548         struct acpi_pci_id *pci_id = *id;
549         acpi_status status;
550         unsigned long temp;
551         acpi_object_type type;
552         u8 tu8;
553
554         acpi_get_parent(chandle, &handle);
555         if (handle != rhandle) {
556                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
557                                         bus_number);
558
559                 status = acpi_get_type(handle, &type);
560                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
561                         return;
562
563                 status =
564                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
565                                           &temp);
566                 if (ACPI_SUCCESS(status)) {
567                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
568                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
569
570                         if (*is_bridge)
571                                 pci_id->bus = *bus_number;
572
573                         /* any nicer way to get bus number of bridge ? */
574                         status =
575                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
576                                                            8);
577                         if (ACPI_SUCCESS(status)
578                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
579                                 status =
580                                     acpi_os_read_pci_configuration(pci_id, 0x18,
581                                                                    &tu8, 8);
582                                 if (!ACPI_SUCCESS(status)) {
583                                         /* Certainly broken...  FIX ME */
584                                         return;
585                                 }
586                                 *is_bridge = 1;
587                                 pci_id->bus = tu8;
588                                 status =
589                                     acpi_os_read_pci_configuration(pci_id, 0x19,
590                                                                    &tu8, 8);
591                                 if (ACPI_SUCCESS(status)) {
592                                         *bus_number = tu8;
593                                 }
594                         } else
595                                 *is_bridge = 0;
596                 }
597         }
598 }
599
600 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
601                            acpi_handle chandle, /* current node */
602                            struct acpi_pci_id **id)
603 {
604         int is_bridge = 1;
605         u8 bus_number = (*id)->bus;
606
607         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
608 }
609
610 static void acpi_os_execute_deferred(struct work_struct *work)
611 {
612         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
613         if (!dpc) {
614                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
615                 return;
616         }
617
618         dpc->function(dpc->context);
619         kfree(dpc);
620
621         /* Yield cpu to notify thread */
622         cond_resched();
623
624         return;
625 }
626
627 static void acpi_os_execute_notify(struct work_struct *work)
628 {
629         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
630
631         if (!dpc) {
632                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
633                 return;
634         }
635
636         dpc->function(dpc->context);
637
638         kfree(dpc);
639
640         return;
641 }
642
643 /*******************************************************************************
644  *
645  * FUNCTION:    acpi_os_execute
646  *
647  * PARAMETERS:  Type               - Type of the callback
648  *              Function           - Function to be executed
649  *              Context            - Function parameters
650  *
651  * RETURN:      Status
652  *
653  * DESCRIPTION: Depending on type, either queues function for deferred execution or
654  *              immediately executes function on a separate thread.
655  *
656  ******************************************************************************/
657
658 acpi_status acpi_os_execute(acpi_execute_type type,
659                             acpi_osd_exec_callback function, void *context)
660 {
661         acpi_status status = AE_OK;
662         struct acpi_os_dpc *dpc;
663
664         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
665                           "Scheduling function [%p(%p)] for deferred execution.\n",
666                           function, context));
667
668         if (!function)
669                 return AE_BAD_PARAMETER;
670
671         /*
672          * Allocate/initialize DPC structure.  Note that this memory will be
673          * freed by the callee.  The kernel handles the work_struct list  in a
674          * way that allows us to also free its memory inside the callee.
675          * Because we may want to schedule several tasks with different
676          * parameters we can't use the approach some kernel code uses of
677          * having a static work_struct.
678          */
679
680         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
681         if (!dpc)
682                 return_ACPI_STATUS(AE_NO_MEMORY);
683
684         dpc->function = function;
685         dpc->context = context;
686
687         if (type == OSL_NOTIFY_HANDLER) {
688                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
689                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
690                         status = AE_ERROR;
691                         kfree(dpc);
692                 }
693         } else {
694                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
695                 if (!queue_work(kacpid_wq, &dpc->work)) {
696                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
697                                   "Call to queue_work() failed.\n"));
698                         status = AE_ERROR;
699                         kfree(dpc);
700                 }
701         }
702         return_ACPI_STATUS(status);
703 }
704
705 EXPORT_SYMBOL(acpi_os_execute);
706
707 void acpi_os_wait_events_complete(void *context)
708 {
709         flush_workqueue(kacpid_wq);
710 }
711
712 EXPORT_SYMBOL(acpi_os_wait_events_complete);
713
714 /*
715  * Allocate the memory for a spinlock and initialize it.
716  */
717 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
718 {
719         spin_lock_init(*handle);
720
721         return AE_OK;
722 }
723
724 /*
725  * Deallocate the memory for a spinlock.
726  */
727 void acpi_os_delete_lock(acpi_spinlock handle)
728 {
729         return;
730 }
731
732 acpi_status
733 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
734 {
735         struct semaphore *sem = NULL;
736
737
738         sem = acpi_os_allocate(sizeof(struct semaphore));
739         if (!sem)
740                 return AE_NO_MEMORY;
741         memset(sem, 0, sizeof(struct semaphore));
742
743         sema_init(sem, initial_units);
744
745         *handle = (acpi_handle *) sem;
746
747         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
748                           *handle, initial_units));
749
750         return AE_OK;
751 }
752
753 EXPORT_SYMBOL(acpi_os_create_semaphore);
754
755 /*
756  * TODO: A better way to delete semaphores?  Linux doesn't have a
757  * 'delete_semaphore()' function -- may result in an invalid
758  * pointer dereference for non-synchronized consumers.  Should
759  * we at least check for blocked threads and signal/cancel them?
760  */
761
762 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
763 {
764         struct semaphore *sem = (struct semaphore *)handle;
765
766
767         if (!sem)
768                 return AE_BAD_PARAMETER;
769
770         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
771
772         kfree(sem);
773         sem = NULL;
774
775         return AE_OK;
776 }
777
778 EXPORT_SYMBOL(acpi_os_delete_semaphore);
779
780 /*
781  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
782  * improvise.  The process is to sleep for one scheduler quantum
783  * until the semaphore becomes available.  Downside is that this
784  * may result in starvation for timeout-based waits when there's
785  * lots of semaphore activity.
786  *
787  * TODO: Support for units > 1?
788  */
789 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
790 {
791         acpi_status status = AE_OK;
792         struct semaphore *sem = (struct semaphore *)handle;
793         int ret = 0;
794
795
796         if (!sem || (units < 1))
797                 return AE_BAD_PARAMETER;
798
799         if (units > 1)
800                 return AE_SUPPORT;
801
802         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
803                           handle, units, timeout));
804
805         /*
806          * This can be called during resume with interrupts off.
807          * Like boot-time, we should be single threaded and will
808          * always get the lock if we try -- timeout or not.
809          * If this doesn't succeed, then we will oops courtesy of
810          * might_sleep() in down().
811          */
812         if (!down_trylock(sem))
813                 return AE_OK;
814
815         switch (timeout) {
816                 /*
817                  * No Wait:
818                  * --------
819                  * A zero timeout value indicates that we shouldn't wait - just
820                  * acquire the semaphore if available otherwise return AE_TIME
821                  * (a.k.a. 'would block').
822                  */
823         case 0:
824                 if (down_trylock(sem))
825                         status = AE_TIME;
826                 break;
827
828                 /*
829                  * Wait Indefinitely:
830                  * ------------------
831                  */
832         case ACPI_WAIT_FOREVER:
833                 down(sem);
834                 break;
835
836                 /*
837                  * Wait w/ Timeout:
838                  * ----------------
839                  */
840         default:
841                 // TODO: A better timeout algorithm?
842                 {
843                         int i = 0;
844                         static const int quantum_ms = 1000 / HZ;
845
846                         ret = down_trylock(sem);
847                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
848                                 schedule_timeout_interruptible(1);
849                                 ret = down_trylock(sem);
850                         }
851
852                         if (ret != 0)
853                                 status = AE_TIME;
854                 }
855                 break;
856         }
857
858         if (ACPI_FAILURE(status)) {
859                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
860                                   "Failed to acquire semaphore[%p|%d|%d], %s",
861                                   handle, units, timeout,
862                                   acpi_format_exception(status)));
863         } else {
864                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
865                                   "Acquired semaphore[%p|%d|%d]", handle,
866                                   units, timeout));
867         }
868
869         return status;
870 }
871
872 EXPORT_SYMBOL(acpi_os_wait_semaphore);
873
874 /*
875  * TODO: Support for units > 1?
876  */
877 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
878 {
879         struct semaphore *sem = (struct semaphore *)handle;
880
881
882         if (!sem || (units < 1))
883                 return AE_BAD_PARAMETER;
884
885         if (units > 1)
886                 return AE_SUPPORT;
887
888         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
889                           units));
890
891         up(sem);
892
893         return AE_OK;
894 }
895
896 EXPORT_SYMBOL(acpi_os_signal_semaphore);
897
898 #ifdef ACPI_FUTURE_USAGE
899 u32 acpi_os_get_line(char *buffer)
900 {
901
902 #ifdef ENABLE_DEBUGGER
903         if (acpi_in_debugger) {
904                 u32 chars;
905
906                 kdb_read(buffer, sizeof(line_buf));
907
908                 /* remove the CR kdb includes */
909                 chars = strlen(buffer) - 1;
910                 buffer[chars] = '\0';
911         }
912 #endif
913
914         return 0;
915 }
916 #endif                          /*  ACPI_FUTURE_USAGE  */
917
918 acpi_status acpi_os_signal(u32 function, void *info)
919 {
920         switch (function) {
921         case ACPI_SIGNAL_FATAL:
922                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
923                 break;
924         case ACPI_SIGNAL_BREAKPOINT:
925                 /*
926                  * AML Breakpoint
927                  * ACPI spec. says to treat it as a NOP unless
928                  * you are debugging.  So if/when we integrate
929                  * AML debugger into the kernel debugger its
930                  * hook will go here.  But until then it is
931                  * not useful to print anything on breakpoints.
932                  */
933                 break;
934         default:
935                 break;
936         }
937
938         return AE_OK;
939 }
940
941 EXPORT_SYMBOL(acpi_os_signal);
942
943 static int __init acpi_os_name_setup(char *str)
944 {
945         char *p = acpi_os_name;
946         int count = ACPI_MAX_OVERRIDE_LEN - 1;
947
948         if (!str || !*str)
949                 return 0;
950
951         for (; count-- && str && *str; str++) {
952                 if (isalnum(*str) || *str == ' ' || *str == ':')
953                         *p++ = *str;
954                 else if (*str == '\'' || *str == '"')
955                         continue;
956                 else
957                         break;
958         }
959         *p = 0;
960
961         return 1;
962
963 }
964
965 __setup("acpi_os_name=", acpi_os_name_setup);
966
967 static void enable_osi_linux(int enable) {
968
969         if (osi_linux != enable)
970                 printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",
971                         enable ? "En": "Dis");
972
973         osi_linux = enable;
974         return;
975 }
976
977 /*
978  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
979  *
980  * empty string disables _OSI
981  * string starting with '!' disables that string
982  * otherwise string is added to list, augmenting built-in strings
983  */
984 static int __init acpi_osi_setup(char *str)
985 {
986         if (str == NULL || *str == '\0') {
987                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
988                 acpi_gbl_create_osi_method = FALSE;
989         } else if (!strcmp("!Linux", str)) {
990                 enable_osi_linux(0);
991         } else if (*str == '!') {
992                 if (acpi_osi_invalidate(++str) == AE_OK)
993                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
994         } else if (!strcmp("Linux", str)) {
995                 enable_osi_linux(1);
996         } else if (*osi_additional_string == '\0') {
997                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
998                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
999         }
1000
1001         return 1;
1002 }
1003
1004 __setup("acpi_osi=", acpi_osi_setup);
1005
1006 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1007 static int __init acpi_serialize_setup(char *str)
1008 {
1009         printk(KERN_INFO PREFIX "serialize enabled\n");
1010
1011         acpi_gbl_all_methods_serialized = TRUE;
1012
1013         return 1;
1014 }
1015
1016 __setup("acpi_serialize", acpi_serialize_setup);
1017
1018 /*
1019  * Wake and Run-Time GPES are expected to be separate.
1020  * We disable wake-GPEs at run-time to prevent spurious
1021  * interrupts.
1022  *
1023  * However, if a system exists that shares Wake and
1024  * Run-time events on the same GPE this flag is available
1025  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1026  */
1027 static int __init acpi_wake_gpes_always_on_setup(char *str)
1028 {
1029         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1030
1031         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1032
1033         return 1;
1034 }
1035
1036 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1037
1038 /*
1039  * Acquire a spinlock.
1040  *
1041  * handle is a pointer to the spinlock_t.
1042  */
1043
1044 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1045 {
1046         acpi_cpu_flags flags;
1047         spin_lock_irqsave(lockp, flags);
1048         return flags;
1049 }
1050
1051 /*
1052  * Release a spinlock. See above.
1053  */
1054
1055 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1056 {
1057         spin_unlock_irqrestore(lockp, flags);
1058 }
1059
1060 #ifndef ACPI_USE_LOCAL_CACHE
1061
1062 /*******************************************************************************
1063  *
1064  * FUNCTION:    acpi_os_create_cache
1065  *
1066  * PARAMETERS:  name      - Ascii name for the cache
1067  *              size      - Size of each cached object
1068  *              depth     - Maximum depth of the cache (in objects) <ignored>
1069  *              cache     - Where the new cache object is returned
1070  *
1071  * RETURN:      status
1072  *
1073  * DESCRIPTION: Create a cache object
1074  *
1075  ******************************************************************************/
1076
1077 acpi_status
1078 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1079 {
1080         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1081         if (*cache == NULL)
1082                 return AE_ERROR;
1083         else
1084                 return AE_OK;
1085 }
1086
1087 /*******************************************************************************
1088  *
1089  * FUNCTION:    acpi_os_purge_cache
1090  *
1091  * PARAMETERS:  Cache           - Handle to cache object
1092  *
1093  * RETURN:      Status
1094  *
1095  * DESCRIPTION: Free all objects within the requested cache.
1096  *
1097  ******************************************************************************/
1098
1099 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1100 {
1101         kmem_cache_shrink(cache);
1102         return (AE_OK);
1103 }
1104
1105 /*******************************************************************************
1106  *
1107  * FUNCTION:    acpi_os_delete_cache
1108  *
1109  * PARAMETERS:  Cache           - Handle to cache object
1110  *
1111  * RETURN:      Status
1112  *
1113  * DESCRIPTION: Free all objects within the requested cache and delete the
1114  *              cache object.
1115  *
1116  ******************************************************************************/
1117
1118 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1119 {
1120         kmem_cache_destroy(cache);
1121         return (AE_OK);
1122 }
1123
1124 /*******************************************************************************
1125  *
1126  * FUNCTION:    acpi_os_release_object
1127  *
1128  * PARAMETERS:  Cache       - Handle to cache object
1129  *              Object      - The object to be released
1130  *
1131  * RETURN:      None
1132  *
1133  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1134  *              the object is deleted.
1135  *
1136  ******************************************************************************/
1137
1138 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1139 {
1140         kmem_cache_free(cache, object);
1141         return (AE_OK);
1142 }
1143
1144 /******************************************************************************
1145  *
1146  * FUNCTION:    acpi_os_validate_interface
1147  *
1148  * PARAMETERS:  interface           - Requested interface to be validated
1149  *
1150  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1151  *
1152  * DESCRIPTION: Match an interface string to the interfaces supported by the
1153  *              host. Strings originate from an AML call to the _OSI method.
1154  *
1155  *****************************************************************************/
1156
1157 acpi_status
1158 acpi_os_validate_interface (char *interface)
1159 {
1160         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1161                 return AE_OK;
1162         if (!strcmp("Linux", interface)) {
1163                 printk(KERN_WARNING PREFIX
1164                         "System BIOS is requesting _OSI(Linux)\n");
1165                 printk(KERN_WARNING PREFIX
1166                         "If \"acpi_osi=Linux\" works better,\n"
1167                         "Please send dmidecode "
1168                         "to linux-acpi@vger.kernel.org\n");
1169                 if(osi_linux)
1170                         return AE_OK;
1171         }
1172         return AE_SUPPORT;
1173 }
1174
1175 /******************************************************************************
1176  *
1177  * FUNCTION:    acpi_os_validate_address
1178  *
1179  * PARAMETERS:  space_id             - ACPI space ID
1180  *              address             - Physical address
1181  *              length              - Address length
1182  *
1183  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1184  *              should return AE_AML_ILLEGAL_ADDRESS.
1185  *
1186  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1187  *              the addresses accessed by AML operation regions.
1188  *
1189  *****************************************************************************/
1190
1191 acpi_status
1192 acpi_os_validate_address (
1193     u8                   space_id,
1194     acpi_physical_address   address,
1195     acpi_size               length)
1196 {
1197
1198     return AE_OK;
1199 }
1200
1201 #ifdef CONFIG_DMI
1202 static int dmi_osi_linux(const struct dmi_system_id *d)
1203 {
1204         printk(KERN_NOTICE "%s detected: enabling _OSI(Linux)\n", d->ident);
1205         enable_osi_linux(1);
1206         return 0;
1207 }
1208
1209 static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {
1210         /*
1211          * Boxes that need _OSI(Linux)
1212          */
1213         {
1214          .callback = dmi_osi_linux,
1215          .ident = "Intel Napa CRB",
1216          .matches = {
1217                      DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
1218                      DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),
1219                      },
1220          },
1221         {}
1222 };
1223 #endif /* CONFIG_DMI */
1224
1225 #endif