drm: DRM: fix memset size error
[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         switch (width) {
391         case 8:
392                 *(u8 *) value = inb(port);
393                 break;
394         case 16:
395                 *(u16 *) value = inw(port);
396                 break;
397         case 32:
398                 *(u32 *) value = inl(port);
399                 break;
400         default:
401                 BUG();
402         }
403
404         return AE_OK;
405 }
406
407 EXPORT_SYMBOL(acpi_os_read_port);
408
409 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
410 {
411         switch (width) {
412         case 8:
413                 outb(value, port);
414                 break;
415         case 16:
416                 outw(value, port);
417                 break;
418         case 32:
419                 outl(value, port);
420                 break;
421         default:
422                 BUG();
423         }
424
425         return AE_OK;
426 }
427
428 EXPORT_SYMBOL(acpi_os_write_port);
429
430 acpi_status
431 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
432 {
433         u32 dummy;
434         void __iomem *virt_addr;
435
436         virt_addr = ioremap(phys_addr, width);
437         if (!value)
438                 value = &dummy;
439
440         switch (width) {
441         case 8:
442                 *(u8 *) value = readb(virt_addr);
443                 break;
444         case 16:
445                 *(u16 *) value = readw(virt_addr);
446                 break;
447         case 32:
448                 *(u32 *) value = readl(virt_addr);
449                 break;
450         default:
451                 BUG();
452         }
453
454         iounmap(virt_addr);
455
456         return AE_OK;
457 }
458
459 acpi_status
460 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
461 {
462         void __iomem *virt_addr;
463
464         virt_addr = ioremap(phys_addr, width);
465
466         switch (width) {
467         case 8:
468                 writeb(value, virt_addr);
469                 break;
470         case 16:
471                 writew(value, virt_addr);
472                 break;
473         case 32:
474                 writel(value, virt_addr);
475                 break;
476         default:
477                 BUG();
478         }
479
480         iounmap(virt_addr);
481
482         return AE_OK;
483 }
484
485 acpi_status
486 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
487                                void *value, u32 width)
488 {
489         int result, size;
490
491         if (!value)
492                 return AE_BAD_PARAMETER;
493
494         switch (width) {
495         case 8:
496                 size = 1;
497                 break;
498         case 16:
499                 size = 2;
500                 break;
501         case 32:
502                 size = 4;
503                 break;
504         default:
505                 return AE_ERROR;
506         }
507
508         BUG_ON(!raw_pci_ops);
509
510         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
511                                    PCI_DEVFN(pci_id->device, pci_id->function),
512                                    reg, size, value);
513
514         return (result ? AE_ERROR : AE_OK);
515 }
516
517 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
518
519 acpi_status
520 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
521                                 acpi_integer value, u32 width)
522 {
523         int result, size;
524
525         switch (width) {
526         case 8:
527                 size = 1;
528                 break;
529         case 16:
530                 size = 2;
531                 break;
532         case 32:
533                 size = 4;
534                 break;
535         default:
536                 return AE_ERROR;
537         }
538
539         BUG_ON(!raw_pci_ops);
540
541         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
542                                     PCI_DEVFN(pci_id->device, pci_id->function),
543                                     reg, size, value);
544
545         return (result ? AE_ERROR : AE_OK);
546 }
547
548 /* TODO: Change code to take advantage of driver model more */
549 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
550                                     acpi_handle chandle,        /* current node */
551                                     struct acpi_pci_id **id,
552                                     int *is_bridge, u8 * bus_number)
553 {
554         acpi_handle handle;
555         struct acpi_pci_id *pci_id = *id;
556         acpi_status status;
557         unsigned long temp;
558         acpi_object_type type;
559         u8 tu8;
560
561         acpi_get_parent(chandle, &handle);
562         if (handle != rhandle) {
563                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
564                                         bus_number);
565
566                 status = acpi_get_type(handle, &type);
567                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
568                         return;
569
570                 status =
571                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
572                                           &temp);
573                 if (ACPI_SUCCESS(status)) {
574                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
575                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
576
577                         if (*is_bridge)
578                                 pci_id->bus = *bus_number;
579
580                         /* any nicer way to get bus number of bridge ? */
581                         status =
582                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
583                                                            8);
584                         if (ACPI_SUCCESS(status)
585                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
586                                 status =
587                                     acpi_os_read_pci_configuration(pci_id, 0x18,
588                                                                    &tu8, 8);
589                                 if (!ACPI_SUCCESS(status)) {
590                                         /* Certainly broken...  FIX ME */
591                                         return;
592                                 }
593                                 *is_bridge = 1;
594                                 pci_id->bus = tu8;
595                                 status =
596                                     acpi_os_read_pci_configuration(pci_id, 0x19,
597                                                                    &tu8, 8);
598                                 if (ACPI_SUCCESS(status)) {
599                                         *bus_number = tu8;
600                                 }
601                         } else
602                                 *is_bridge = 0;
603                 }
604         }
605 }
606
607 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
608                            acpi_handle chandle, /* current node */
609                            struct acpi_pci_id **id)
610 {
611         int is_bridge = 1;
612         u8 bus_number = (*id)->bus;
613
614         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
615 }
616
617 static void acpi_os_execute_deferred(struct work_struct *work)
618 {
619         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
620         if (!dpc) {
621                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
622                 return;
623         }
624
625         dpc->function(dpc->context);
626         kfree(dpc);
627
628         /* Yield cpu to notify thread */
629         cond_resched();
630
631         return;
632 }
633
634 static void acpi_os_execute_notify(struct work_struct *work)
635 {
636         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
637
638         if (!dpc) {
639                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
640                 return;
641         }
642
643         dpc->function(dpc->context);
644
645         kfree(dpc);
646
647         return;
648 }
649
650 /*******************************************************************************
651  *
652  * FUNCTION:    acpi_os_execute
653  *
654  * PARAMETERS:  Type               - Type of the callback
655  *              Function           - Function to be executed
656  *              Context            - Function parameters
657  *
658  * RETURN:      Status
659  *
660  * DESCRIPTION: Depending on type, either queues function for deferred execution or
661  *              immediately executes function on a separate thread.
662  *
663  ******************************************************************************/
664
665 acpi_status acpi_os_execute(acpi_execute_type type,
666                             acpi_osd_exec_callback function, void *context)
667 {
668         acpi_status status = AE_OK;
669         struct acpi_os_dpc *dpc;
670
671         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
672                           "Scheduling function [%p(%p)] for deferred execution.\n",
673                           function, context));
674
675         if (!function)
676                 return AE_BAD_PARAMETER;
677
678         /*
679          * Allocate/initialize DPC structure.  Note that this memory will be
680          * freed by the callee.  The kernel handles the work_struct list  in a
681          * way that allows us to also free its memory inside the callee.
682          * Because we may want to schedule several tasks with different
683          * parameters we can't use the approach some kernel code uses of
684          * having a static work_struct.
685          */
686
687         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
688         if (!dpc)
689                 return_ACPI_STATUS(AE_NO_MEMORY);
690
691         dpc->function = function;
692         dpc->context = context;
693
694         if (type == OSL_NOTIFY_HANDLER) {
695                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
696                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
697                         status = AE_ERROR;
698                         kfree(dpc);
699                 }
700         } else {
701                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
702                 if (!queue_work(kacpid_wq, &dpc->work)) {
703                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
704                                   "Call to queue_work() failed.\n"));
705                         status = AE_ERROR;
706                         kfree(dpc);
707                 }
708         }
709         return_ACPI_STATUS(status);
710 }
711
712 EXPORT_SYMBOL(acpi_os_execute);
713
714 void acpi_os_wait_events_complete(void *context)
715 {
716         flush_workqueue(kacpid_wq);
717 }
718
719 EXPORT_SYMBOL(acpi_os_wait_events_complete);
720
721 /*
722  * Allocate the memory for a spinlock and initialize it.
723  */
724 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
725 {
726         spin_lock_init(*handle);
727
728         return AE_OK;
729 }
730
731 /*
732  * Deallocate the memory for a spinlock.
733  */
734 void acpi_os_delete_lock(acpi_spinlock handle)
735 {
736         return;
737 }
738
739 acpi_status
740 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
741 {
742         struct semaphore *sem = NULL;
743
744
745         sem = acpi_os_allocate(sizeof(struct semaphore));
746         if (!sem)
747                 return AE_NO_MEMORY;
748         memset(sem, 0, sizeof(struct semaphore));
749
750         sema_init(sem, initial_units);
751
752         *handle = (acpi_handle *) sem;
753
754         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
755                           *handle, initial_units));
756
757         return AE_OK;
758 }
759
760 EXPORT_SYMBOL(acpi_os_create_semaphore);
761
762 /*
763  * TODO: A better way to delete semaphores?  Linux doesn't have a
764  * 'delete_semaphore()' function -- may result in an invalid
765  * pointer dereference for non-synchronized consumers.  Should
766  * we at least check for blocked threads and signal/cancel them?
767  */
768
769 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
770 {
771         struct semaphore *sem = (struct semaphore *)handle;
772
773
774         if (!sem)
775                 return AE_BAD_PARAMETER;
776
777         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
778
779         kfree(sem);
780         sem = NULL;
781
782         return AE_OK;
783 }
784
785 EXPORT_SYMBOL(acpi_os_delete_semaphore);
786
787 /*
788  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
789  * improvise.  The process is to sleep for one scheduler quantum
790  * until the semaphore becomes available.  Downside is that this
791  * may result in starvation for timeout-based waits when there's
792  * lots of semaphore activity.
793  *
794  * TODO: Support for units > 1?
795  */
796 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
797 {
798         acpi_status status = AE_OK;
799         struct semaphore *sem = (struct semaphore *)handle;
800         int ret = 0;
801
802
803         if (!sem || (units < 1))
804                 return AE_BAD_PARAMETER;
805
806         if (units > 1)
807                 return AE_SUPPORT;
808
809         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
810                           handle, units, timeout));
811
812         /*
813          * This can be called during resume with interrupts off.
814          * Like boot-time, we should be single threaded and will
815          * always get the lock if we try -- timeout or not.
816          * If this doesn't succeed, then we will oops courtesy of
817          * might_sleep() in down().
818          */
819         if (!down_trylock(sem))
820                 return AE_OK;
821
822         switch (timeout) {
823                 /*
824                  * No Wait:
825                  * --------
826                  * A zero timeout value indicates that we shouldn't wait - just
827                  * acquire the semaphore if available otherwise return AE_TIME
828                  * (a.k.a. 'would block').
829                  */
830         case 0:
831                 if (down_trylock(sem))
832                         status = AE_TIME;
833                 break;
834
835                 /*
836                  * Wait Indefinitely:
837                  * ------------------
838                  */
839         case ACPI_WAIT_FOREVER:
840                 down(sem);
841                 break;
842
843                 /*
844                  * Wait w/ Timeout:
845                  * ----------------
846                  */
847         default:
848                 // TODO: A better timeout algorithm?
849                 {
850                         int i = 0;
851                         static const int quantum_ms = 1000 / HZ;
852
853                         ret = down_trylock(sem);
854                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
855                                 schedule_timeout_interruptible(1);
856                                 ret = down_trylock(sem);
857                         }
858
859                         if (ret != 0)
860                                 status = AE_TIME;
861                 }
862                 break;
863         }
864
865         if (ACPI_FAILURE(status)) {
866                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
867                                   "Failed to acquire semaphore[%p|%d|%d], %s",
868                                   handle, units, timeout,
869                                   acpi_format_exception(status)));
870         } else {
871                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
872                                   "Acquired semaphore[%p|%d|%d]", handle,
873                                   units, timeout));
874         }
875
876         return status;
877 }
878
879 EXPORT_SYMBOL(acpi_os_wait_semaphore);
880
881 /*
882  * TODO: Support for units > 1?
883  */
884 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
885 {
886         struct semaphore *sem = (struct semaphore *)handle;
887
888
889         if (!sem || (units < 1))
890                 return AE_BAD_PARAMETER;
891
892         if (units > 1)
893                 return AE_SUPPORT;
894
895         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
896                           units));
897
898         up(sem);
899
900         return AE_OK;
901 }
902
903 EXPORT_SYMBOL(acpi_os_signal_semaphore);
904
905 #ifdef ACPI_FUTURE_USAGE
906 u32 acpi_os_get_line(char *buffer)
907 {
908
909 #ifdef ENABLE_DEBUGGER
910         if (acpi_in_debugger) {
911                 u32 chars;
912
913                 kdb_read(buffer, sizeof(line_buf));
914
915                 /* remove the CR kdb includes */
916                 chars = strlen(buffer) - 1;
917                 buffer[chars] = '\0';
918         }
919 #endif
920
921         return 0;
922 }
923 #endif                          /*  ACPI_FUTURE_USAGE  */
924
925 acpi_status acpi_os_signal(u32 function, void *info)
926 {
927         switch (function) {
928         case ACPI_SIGNAL_FATAL:
929                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
930                 break;
931         case ACPI_SIGNAL_BREAKPOINT:
932                 /*
933                  * AML Breakpoint
934                  * ACPI spec. says to treat it as a NOP unless
935                  * you are debugging.  So if/when we integrate
936                  * AML debugger into the kernel debugger its
937                  * hook will go here.  But until then it is
938                  * not useful to print anything on breakpoints.
939                  */
940                 break;
941         default:
942                 break;
943         }
944
945         return AE_OK;
946 }
947
948 EXPORT_SYMBOL(acpi_os_signal);
949
950 static int __init acpi_os_name_setup(char *str)
951 {
952         char *p = acpi_os_name;
953         int count = ACPI_MAX_OVERRIDE_LEN - 1;
954
955         if (!str || !*str)
956                 return 0;
957
958         for (; count-- && str && *str; str++) {
959                 if (isalnum(*str) || *str == ' ' || *str == ':')
960                         *p++ = *str;
961                 else if (*str == '\'' || *str == '"')
962                         continue;
963                 else
964                         break;
965         }
966         *p = 0;
967
968         return 1;
969
970 }
971
972 __setup("acpi_os_name=", acpi_os_name_setup);
973
974 static void enable_osi_linux(int enable) {
975
976         if (osi_linux != enable)
977                 printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",
978                         enable ? "En": "Dis");
979
980         osi_linux = enable;
981         return;
982 }
983
984 /*
985  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
986  *
987  * empty string disables _OSI
988  * string starting with '!' disables that string
989  * otherwise string is added to list, augmenting built-in strings
990  */
991 static int __init acpi_osi_setup(char *str)
992 {
993         if (str == NULL || *str == '\0') {
994                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
995                 acpi_gbl_create_osi_method = FALSE;
996         } else if (!strcmp("!Linux", str)) {
997                 enable_osi_linux(0);
998         } else if (*str == '!') {
999                 if (acpi_osi_invalidate(++str) == AE_OK)
1000                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1001         } else if (!strcmp("Linux", str)) {
1002                 enable_osi_linux(1);
1003         } else if (*osi_additional_string == '\0') {
1004                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1005                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1006         }
1007
1008         return 1;
1009 }
1010
1011 __setup("acpi_osi=", acpi_osi_setup);
1012
1013 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1014 static int __init acpi_serialize_setup(char *str)
1015 {
1016         printk(KERN_INFO PREFIX "serialize enabled\n");
1017
1018         acpi_gbl_all_methods_serialized = TRUE;
1019
1020         return 1;
1021 }
1022
1023 __setup("acpi_serialize", acpi_serialize_setup);
1024
1025 /*
1026  * Wake and Run-Time GPES are expected to be separate.
1027  * We disable wake-GPEs at run-time to prevent spurious
1028  * interrupts.
1029  *
1030  * However, if a system exists that shares Wake and
1031  * Run-time events on the same GPE this flag is available
1032  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1033  */
1034 static int __init acpi_wake_gpes_always_on_setup(char *str)
1035 {
1036         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1037
1038         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1039
1040         return 1;
1041 }
1042
1043 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1044
1045 /*
1046  * Acquire a spinlock.
1047  *
1048  * handle is a pointer to the spinlock_t.
1049  */
1050
1051 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1052 {
1053         acpi_cpu_flags flags;
1054         spin_lock_irqsave(lockp, flags);
1055         return flags;
1056 }
1057
1058 /*
1059  * Release a spinlock. See above.
1060  */
1061
1062 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1063 {
1064         spin_unlock_irqrestore(lockp, flags);
1065 }
1066
1067 #ifndef ACPI_USE_LOCAL_CACHE
1068
1069 /*******************************************************************************
1070  *
1071  * FUNCTION:    acpi_os_create_cache
1072  *
1073  * PARAMETERS:  name      - Ascii name for the cache
1074  *              size      - Size of each cached object
1075  *              depth     - Maximum depth of the cache (in objects) <ignored>
1076  *              cache     - Where the new cache object is returned
1077  *
1078  * RETURN:      status
1079  *
1080  * DESCRIPTION: Create a cache object
1081  *
1082  ******************************************************************************/
1083
1084 acpi_status
1085 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1086 {
1087         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1088         if (*cache == NULL)
1089                 return AE_ERROR;
1090         else
1091                 return AE_OK;
1092 }
1093
1094 /*******************************************************************************
1095  *
1096  * FUNCTION:    acpi_os_purge_cache
1097  *
1098  * PARAMETERS:  Cache           - Handle to cache object
1099  *
1100  * RETURN:      Status
1101  *
1102  * DESCRIPTION: Free all objects within the requested cache.
1103  *
1104  ******************************************************************************/
1105
1106 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1107 {
1108         kmem_cache_shrink(cache);
1109         return (AE_OK);
1110 }
1111
1112 /*******************************************************************************
1113  *
1114  * FUNCTION:    acpi_os_delete_cache
1115  *
1116  * PARAMETERS:  Cache           - Handle to cache object
1117  *
1118  * RETURN:      Status
1119  *
1120  * DESCRIPTION: Free all objects within the requested cache and delete the
1121  *              cache object.
1122  *
1123  ******************************************************************************/
1124
1125 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1126 {
1127         kmem_cache_destroy(cache);
1128         return (AE_OK);
1129 }
1130
1131 /*******************************************************************************
1132  *
1133  * FUNCTION:    acpi_os_release_object
1134  *
1135  * PARAMETERS:  Cache       - Handle to cache object
1136  *              Object      - The object to be released
1137  *
1138  * RETURN:      None
1139  *
1140  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1141  *              the object is deleted.
1142  *
1143  ******************************************************************************/
1144
1145 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1146 {
1147         kmem_cache_free(cache, object);
1148         return (AE_OK);
1149 }
1150
1151 /******************************************************************************
1152  *
1153  * FUNCTION:    acpi_os_validate_interface
1154  *
1155  * PARAMETERS:  interface           - Requested interface to be validated
1156  *
1157  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1158  *
1159  * DESCRIPTION: Match an interface string to the interfaces supported by the
1160  *              host. Strings originate from an AML call to the _OSI method.
1161  *
1162  *****************************************************************************/
1163
1164 acpi_status
1165 acpi_os_validate_interface (char *interface)
1166 {
1167         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1168                 return AE_OK;
1169         if (!strcmp("Linux", interface)) {
1170                 printk(KERN_WARNING PREFIX
1171                         "System BIOS is requesting _OSI(Linux)\n");
1172                 printk(KERN_WARNING PREFIX
1173                         "If \"acpi_osi=Linux\" works better,\n"
1174                         "Please send dmidecode "
1175                         "to linux-acpi@vger.kernel.org\n");
1176                 if(osi_linux)
1177                         return AE_OK;
1178         }
1179         return AE_SUPPORT;
1180 }
1181
1182 /******************************************************************************
1183  *
1184  * FUNCTION:    acpi_os_validate_address
1185  *
1186  * PARAMETERS:  space_id             - ACPI space ID
1187  *              address             - Physical address
1188  *              length              - Address length
1189  *
1190  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1191  *              should return AE_AML_ILLEGAL_ADDRESS.
1192  *
1193  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1194  *              the addresses accessed by AML operation regions.
1195  *
1196  *****************************************************************************/
1197
1198 acpi_status
1199 acpi_os_validate_address (
1200     u8                   space_id,
1201     acpi_physical_address   address,
1202     acpi_size               length)
1203 {
1204
1205     return AE_OK;
1206 }
1207
1208 #ifdef CONFIG_DMI
1209 static int dmi_osi_linux(const struct dmi_system_id *d)
1210 {
1211         printk(KERN_NOTICE "%s detected: enabling _OSI(Linux)\n", d->ident);
1212         enable_osi_linux(1);
1213         return 0;
1214 }
1215
1216 static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {
1217         /*
1218          * Boxes that need _OSI(Linux)
1219          */
1220         {
1221          .callback = dmi_osi_linux,
1222          .ident = "Intel Napa CRB",
1223          .matches = {
1224                      DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
1225                      DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),
1226                      },
1227          },
1228         {}
1229 };
1230 #endif /* CONFIG_DMI */
1231
1232 #endif