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/smp_lock.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/kmod.h>
  36 #include <linux/delay.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/nmi.h>
  39 #include <acpi/acpi.h>
  40 #include <asm/io.h>
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/processor.h>
  43 #include <asm/uaccess.h>
  44
  45 #include <linux/efi.h>
  46
  47 #define _COMPONENT              ACPI_OS_SERVICES
  48 ACPI_MODULE_NAME("osl")
  49 #define PREFIX          "ACPI: "
  50 struct acpi_os_dpc {
  51         acpi_osd_exec_callback function;
  52         void *context;
  53         struct work_struct work;
  54 };
  55
  56 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  57 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  58 #endif
  59
  60 #ifdef ENABLE_DEBUGGER
  61 #include <linux/kdb.h>
  62
  63 /* stuff for debugger support */
  64 int acpi_in_debugger;
  65 EXPORT_SYMBOL(acpi_in_debugger);
  66
  67 extern char line_buf[80];
  68 #endif                          /*ENABLE_DEBUGGER */
  69
  70 int acpi_specific_hotkey_enabled = TRUE;
  71 EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
  72
  73 static unsigned int acpi_irq_irq;
  74 static acpi_osd_handler acpi_irq_handler;
  75 static void *acpi_irq_context;
  76 static struct workqueue_struct *kacpid_wq;
  77
  78 acpi_status acpi_os_initialize(void)
  79 {
  80         return AE_OK;
  81 }
  82
  83 acpi_status acpi_os_initialize1(void)
  84 {
  85         /*
  86          * Initialize PCI configuration space access, as we'll need to access
  87          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
  88          */
  89         if (!raw_pci_ops) {
  90                 printk(KERN_ERR PREFIX
  91                        "Access to PCI configuration space unavailable\n");
  92                 return AE_NULL_ENTRY;
  93         }
  94         kacpid_wq = create_singlethread_workqueue("kacpid");
  95         BUG_ON(!kacpid_wq);
  96
  97         return AE_OK;
  98 }
  99
 100 acpi_status acpi_os_terminate(void)
 101 {
 102         if (acpi_irq_handler) {
 103                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 104                                                  acpi_irq_handler);
 105         }
 106
 107         destroy_workqueue(kacpid_wq);
 108
 109         return AE_OK;
 110 }
 111
 112 void acpi_os_printf(const char *fmt, ...)
 113 {
 114         va_list args;
 115         va_start(args, fmt);
 116         acpi_os_vprintf(fmt, args);
 117         va_end(args);
 118 }
 119
 120 EXPORT_SYMBOL(acpi_os_printf);
 121
 122 void acpi_os_vprintf(const char *fmt, va_list args)
 123 {
 124         static char buffer[512];
 125
 126         vsprintf(buffer, fmt, args);
 127
 128 #ifdef ENABLE_DEBUGGER
 129         if (acpi_in_debugger) {
 130                 kdb_printf("%s", buffer);
 131         } else {
 132                 printk("%s", buffer);
 133         }
 134 #else
 135         printk("%s", buffer);
 136 #endif
 137 }
 138
 139 acpi_status acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
 140 {
 141         if (efi_enabled) {
 142                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
 143                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 144                         addr->pointer.physical = efi.acpi20;
 145                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 146                         addr->pointer.physical = efi.acpi;
 147                 else {
 148                         printk(KERN_ERR PREFIX
 149                                "System description tables not found\n");
 150                         return AE_NOT_FOUND;
 151                 }
 152         } else {
 153                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
 154                         printk(KERN_ERR PREFIX
 155                                "System description tables not found\n");
 156                         return AE_NOT_FOUND;
 157                 }
 158         }
 159
 160         return AE_OK;
 161 }
 162
 163 acpi_status
 164 acpi_os_map_memory(acpi_physical_address phys, acpi_size size,
 165                    void __iomem ** virt)
 166 {
 167         if (phys > ULONG_MAX) {
 168                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 169                 return AE_BAD_PARAMETER;
 170         }
 171         /*
 172          * ioremap checks to ensure this is in reserved space
 173          */
 174         *virt = ioremap((unsigned long)phys, size);
 175
 176         if (!*virt)
 177                 return AE_NO_MEMORY;
 178
 179         return AE_OK;
 180 }
 181 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 182
 183 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 184 {
 185         iounmap(virt);
 186 }
 187 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 188
 189 #ifdef ACPI_FUTURE_USAGE
 190 acpi_status
 191 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 192 {
 193         if (!phys || !virt)
 194                 return AE_BAD_PARAMETER;
 195
 196         *phys = virt_to_phys(virt);
 197
 198         return AE_OK;
 199 }
 200 #endif
 201
 202 #define ACPI_MAX_OVERRIDE_LEN 100
 203
 204 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 205
 206 acpi_status
 207 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 208                             acpi_string * new_val)
 209 {
 210         if (!init_val || !new_val)
 211                 return AE_BAD_PARAMETER;
 212
 213         *new_val = NULL;
 214         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 215                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 216                        acpi_os_name);
 217                 *new_val = acpi_os_name;
 218         }
 219
 220         return AE_OK;
 221 }
 222
 223 acpi_status
 224 acpi_os_table_override(struct acpi_table_header * existing_table,
 225                        struct acpi_table_header ** new_table)
 226 {
 227         if (!existing_table || !new_table)
 228                 return AE_BAD_PARAMETER;
 229
 230 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 231         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 232                 *new_table = (struct acpi_table_header *)AmlCode;
 233         else
 234                 *new_table = NULL;
 235 #else
 236         *new_table = NULL;
 237 #endif
 238         return AE_OK;
 239 }
 240
 241 static irqreturn_t acpi_irq(int irq, void *dev_id)
 242 {
 243         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 244 }
 245
 246 acpi_status
 247 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 248                                   void *context)
 249 {
 250         unsigned int irq;
 251
 252         /*
 253          * Ignore the GSI from the core, and use the value in our copy of the
 254          * FADT. It may not be the same if an interrupt source override exists
 255          * for the SCI.
 256          */
 257         gsi = acpi_fadt.sci_int;
 258         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 259                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 260                        gsi);
 261                 return AE_OK;
 262         }
 263
 264         acpi_irq_handler = handler;
 265         acpi_irq_context = context;
 266         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 267                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 268                 return AE_NOT_ACQUIRED;
 269         }
 270         acpi_irq_irq = irq;
 271
 272         return AE_OK;
 273 }
 274
 275 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 276 {
 277         if (irq) {
 278                 free_irq(irq, acpi_irq);
 279                 acpi_irq_handler = NULL;
 280                 acpi_irq_irq = 0;
 281         }
 282
 283         return AE_OK;
 284 }
 285
 286 /*
 287  * Running in interpreter thread context, safe to sleep
 288  */
 289
 290 void acpi_os_sleep(acpi_integer ms)
 291 {
 292         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 293 }
 294
 295 EXPORT_SYMBOL(acpi_os_sleep);
 296
 297 void acpi_os_stall(u32 us)
 298 {
 299         while (us) {
 300                 u32 delay = 1000;
 301
 302                 if (delay > us)
 303                         delay = us;
 304                 udelay(delay);
 305                 touch_nmi_watchdog();
 306                 us -= delay;
 307         }
 308 }
 309
 310 EXPORT_SYMBOL(acpi_os_stall);
 311
 312 /*
 313  * Support ACPI 3.0 AML Timer operand
 314  * Returns 64-bit free-running, monotonically increasing timer
 315  * with 100ns granularity
 316  */
 317 u64 acpi_os_get_timer(void)
 318 {
 319         static u64 t;
 320
 321 #ifdef  CONFIG_HPET
 322         /* TBD: use HPET if available */
 323 #endif
 324
 325 #ifdef  CONFIG_X86_PM_TIMER
 326         /* TBD: default to PM timer if HPET was not available */
 327 #endif
 328         if (!t)
 329                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 330
 331         return ++t;
 332 }
 333
 334 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 335 {
 336         u32 dummy;
 337
 338         if (!value)
 339                 value = &dummy;
 340
 341         switch (width) {
 342         case 8:
 343                 *(u8 *) value = inb(port);
 344                 break;
 345         case 16:
 346                 *(u16 *) value = inw(port);
 347                 break;
 348         case 32:
 349                 *(u32 *) value = inl(port);
 350                 break;
 351         default:
 352                 BUG();
 353         }
 354
 355         return AE_OK;
 356 }
 357
 358 EXPORT_SYMBOL(acpi_os_read_port);
 359
 360 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 361 {
 362         switch (width) {
 363         case 8:
 364                 outb(value, port);
 365                 break;
 366         case 16:
 367                 outw(value, port);
 368                 break;
 369         case 32:
 370                 outl(value, port);
 371                 break;
 372         default:
 373                 BUG();
 374         }
 375
 376         return AE_OK;
 377 }
 378
 379 EXPORT_SYMBOL(acpi_os_write_port);
 380
 381 acpi_status
 382 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 383 {
 384         u32 dummy;
 385         void __iomem *virt_addr;
 386
 387         virt_addr = ioremap(phys_addr, width);
 388         if (!value)
 389                 value = &dummy;
 390
 391         switch (width) {
 392         case 8:
 393                 *(u8 *) value = readb(virt_addr);
 394                 break;
 395         case 16:
 396                 *(u16 *) value = readw(virt_addr);
 397                 break;
 398         case 32:
 399                 *(u32 *) value = readl(virt_addr);
 400                 break;
 401         default:
 402                 BUG();
 403         }
 404
 405         iounmap(virt_addr);
 406
 407         return AE_OK;
 408 }
 409
 410 acpi_status
 411 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 412 {
 413         void __iomem *virt_addr;
 414
 415         virt_addr = ioremap(phys_addr, width);
 416
 417         switch (width) {
 418         case 8:
 419                 writeb(value, virt_addr);
 420                 break;
 421         case 16:
 422                 writew(value, virt_addr);
 423                 break;
 424         case 32:
 425                 writel(value, virt_addr);
 426                 break;
 427         default:
 428                 BUG();
 429         }
 430
 431         iounmap(virt_addr);
 432
 433         return AE_OK;
 434 }
 435
 436 acpi_status
 437 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 438                                void *value, u32 width)
 439 {
 440         int result, size;
 441
 442         if (!value)
 443                 return AE_BAD_PARAMETER;
 444
 445         switch (width) {
 446         case 8:
 447                 size = 1;
 448                 break;
 449         case 16:
 450                 size = 2;
 451                 break;
 452         case 32:
 453                 size = 4;
 454                 break;
 455         default:
 456                 return AE_ERROR;
 457         }
 458
 459         BUG_ON(!raw_pci_ops);
 460
 461         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 462                                    PCI_DEVFN(pci_id->device, pci_id->function),
 463                                    reg, size, value);
 464
 465         return (result ? AE_ERROR : AE_OK);
 466 }
 467
 468 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 469
 470 acpi_status
 471 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 472                                 acpi_integer value, u32 width)
 473 {
 474         int result, size;
 475
 476         switch (width) {
 477         case 8:
 478                 size = 1;
 479                 break;
 480         case 16:
 481                 size = 2;
 482                 break;
 483         case 32:
 484                 size = 4;
 485                 break;
 486         default:
 487                 return AE_ERROR;
 488         }
 489
 490         BUG_ON(!raw_pci_ops);
 491
 492         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 493                                     PCI_DEVFN(pci_id->device, pci_id->function),
 494                                     reg, size, value);
 495
 496         return (result ? AE_ERROR : AE_OK);
 497 }
 498
 499 /* TODO: Change code to take advantage of driver model more */
 500 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 501                                     acpi_handle chandle,        /* current node */
 502                                     struct acpi_pci_id **id,
 503                                     int *is_bridge, u8 * bus_number)
 504 {
 505         acpi_handle handle;
 506         struct acpi_pci_id *pci_id = *id;
 507         acpi_status status;
 508         unsigned long temp;
 509         acpi_object_type type;
 510         u8 tu8;
 511
 512         acpi_get_parent(chandle, &handle);
 513         if (handle != rhandle) {
 514                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 515                                         bus_number);
 516
 517                 status = acpi_get_type(handle, &type);
 518                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 519                         return;
 520
 521                 status =
 522                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 523                                           &temp);
 524                 if (ACPI_SUCCESS(status)) {
 525                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 526                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 527
 528                         if (*is_bridge)
 529                                 pci_id->bus = *bus_number;
 530
 531                         /* any nicer way to get bus number of bridge ? */
 532                         status =
 533                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 534                                                            8);
 535                         if (ACPI_SUCCESS(status)
 536                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 537                                 status =
 538                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 539                                                                    &tu8, 8);
 540                                 if (!ACPI_SUCCESS(status)) {
 541                                         /* Certainly broken...  FIX ME */
 542                                         return;
 543                                 }
 544                                 *is_bridge = 1;
 545                                 pci_id->bus = tu8;
 546                                 status =
 547                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 548                                                                    &tu8, 8);
 549                                 if (ACPI_SUCCESS(status)) {
 550                                         *bus_number = tu8;
 551                                 }
 552                         } else
 553                                 *is_bridge = 0;
 554                 }
 555         }
 556 }
 557
 558 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 559                            acpi_handle chandle, /* current node */
 560                            struct acpi_pci_id **id)
 561 {
 562         int is_bridge = 1;
 563         u8 bus_number = (*id)->bus;
 564
 565         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 566 }
 567
 568 static void acpi_os_execute_deferred(struct work_struct *work)
 569 {
 570         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 571         if (!dpc) {
 572                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 573                 return;
 574         }
 575
 576         dpc->function(dpc->context);
 577
 578         kfree(dpc);
 579
 580         return;
 581 }
 582
 583 /*******************************************************************************
 584  *
 585  * FUNCTION:    acpi_os_execute
 586  *
 587  * PARAMETERS:  Type               - Type of the callback
 588  *              Function           - Function to be executed
 589  *              Context            - Function parameters
 590  *
 591  * RETURN:      Status
 592  *
 593  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 594  *              immediately executes function on a separate thread.
 595  *
 596  ******************************************************************************/
 597
 598 acpi_status acpi_os_execute(acpi_execute_type type,
 599                             acpi_osd_exec_callback function, void *context)
 600 {
 601         acpi_status status = AE_OK;
 602         struct acpi_os_dpc *dpc;
 603
 604         ACPI_FUNCTION_TRACE("os_queue_for_execution");
 605
 606         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 607                           "Scheduling function [%p(%p)] for deferred execution.\n",
 608                           function, context));
 609
 610         if (!function)
 611                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 612
 613         /*
 614          * Allocate/initialize DPC structure.  Note that this memory will be
 615          * freed by the callee.  The kernel handles the work_struct list  in a
 616          * way that allows us to also free its memory inside the callee.
 617          * Because we may want to schedule several tasks with different
 618          * parameters we can't use the approach some kernel code uses of
 619          * having a static work_struct.
 620          */
 621
 622         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 623         if (!dpc)
 624                 return_ACPI_STATUS(AE_NO_MEMORY);
 625
 626         dpc->function = function;
 627         dpc->context = context;
 628
 629         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 630         if (!queue_work(kacpid_wq, &dpc->work)) {
 631                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 632                                   "Call to queue_work() failed.\n"));
 633                 kfree(dpc);
 634                 status = AE_ERROR;
 635         }
 636
 637         return_ACPI_STATUS(status);
 638 }
 639
 640 EXPORT_SYMBOL(acpi_os_execute);
 641
 642 void acpi_os_wait_events_complete(void *context)
 643 {
 644         flush_workqueue(kacpid_wq);
 645 }
 646
 647 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 648
 649 /*
 650  * Allocate the memory for a spinlock and initialize it.
 651  */
 652 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 653 {
 654         spin_lock_init(*handle);
 655
 656         return AE_OK;
 657 }
 658
 659 /*
 660  * Deallocate the memory for a spinlock.
 661  */
 662 void acpi_os_delete_lock(acpi_spinlock handle)
 663 {
 664         return;
 665 }
 666
 667 acpi_status
 668 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 669 {
 670         struct semaphore *sem = NULL;
 671
 672
 673         sem = acpi_os_allocate(sizeof(struct semaphore));
 674         if (!sem)
 675                 return AE_NO_MEMORY;
 676         memset(sem, 0, sizeof(struct semaphore));
 677
 678         sema_init(sem, initial_units);
 679
 680         *handle = (acpi_handle *) sem;
 681
 682         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 683                           *handle, initial_units));
 684
 685         return AE_OK;
 686 }
 687
 688 EXPORT_SYMBOL(acpi_os_create_semaphore);
 689
 690 /*
 691  * TODO: A better way to delete semaphores?  Linux doesn't have a
 692  * 'delete_semaphore()' function -- may result in an invalid
 693  * pointer dereference for non-synchronized consumers.  Should
 694  * we at least check for blocked threads and signal/cancel them?
 695  */
 696
 697 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 698 {
 699         struct semaphore *sem = (struct semaphore *)handle;
 700
 701
 702         if (!sem)
 703                 return AE_BAD_PARAMETER;
 704
 705         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 706
 707         kfree(sem);
 708         sem = NULL;
 709
 710         return AE_OK;
 711 }
 712
 713 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 714
 715 /*
 716  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 717  * improvise.  The process is to sleep for one scheduler quantum
 718  * until the semaphore becomes available.  Downside is that this
 719  * may result in starvation for timeout-based waits when there's
 720  * lots of semaphore activity.
 721  *
 722  * TODO: Support for units > 1?
 723  */
 724 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 725 {
 726         acpi_status status = AE_OK;
 727         struct semaphore *sem = (struct semaphore *)handle;
 728         int ret = 0;
 729
 730
 731         if (!sem || (units < 1))
 732                 return AE_BAD_PARAMETER;
 733
 734         if (units > 1)
 735                 return AE_SUPPORT;
 736
 737         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 738                           handle, units, timeout));
 739
 740         /*
 741          * This can be called during resume with interrupts off.
 742          * Like boot-time, we should be single threaded and will
 743          * always get the lock if we try -- timeout or not.
 744          * If this doesn't succeed, then we will oops courtesy of
 745          * might_sleep() in down().
 746          */
 747         if (!down_trylock(sem))
 748                 return AE_OK;
 749
 750         switch (timeout) {
 751                 /*
 752                  * No Wait:
 753                  * --------
 754                  * A zero timeout value indicates that we shouldn't wait - just
 755                  * acquire the semaphore if available otherwise return AE_TIME
 756                  * (a.k.a. 'would block').
 757                  */
 758         case 0:
 759                 if (down_trylock(sem))
 760                         status = AE_TIME;
 761                 break;
 762
 763                 /*
 764                  * Wait Indefinitely:
 765                  * ------------------
 766                  */
 767         case ACPI_WAIT_FOREVER:
 768                 down(sem);
 769                 break;
 770
 771                 /*
 772                  * Wait w/ Timeout:
 773                  * ----------------
 774                  */
 775         default:
 776                 // TODO: A better timeout algorithm?
 777                 {
 778                         int i = 0;
 779                         static const int quantum_ms = 1000 / HZ;
 780
 781                         ret = down_trylock(sem);
 782                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 783                                 schedule_timeout_interruptible(1);
 784                                 ret = down_trylock(sem);
 785                         }
 786
 787                         if (ret != 0)
 788                                 status = AE_TIME;
 789                 }
 790                 break;
 791         }
 792
 793         if (ACPI_FAILURE(status)) {
 794                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 795                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 796                                   handle, units, timeout,
 797                                   acpi_format_exception(status)));
 798         } else {
 799                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 800                                   "Acquired semaphore[%p|%d|%d]", handle,
 801                                   units, timeout));
 802         }
 803
 804         return status;
 805 }
 806
 807 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 808
 809 /*
 810  * TODO: Support for units > 1?
 811  */
 812 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 813 {
 814         struct semaphore *sem = (struct semaphore *)handle;
 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, "Signaling semaphore[%p|%d]\n", handle,
 824                           units));
 825
 826         up(sem);
 827
 828         return AE_OK;
 829 }
 830
 831 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 832
 833 #ifdef ACPI_FUTURE_USAGE
 834 u32 acpi_os_get_line(char *buffer)
 835 {
 836
 837 #ifdef ENABLE_DEBUGGER
 838         if (acpi_in_debugger) {
 839                 u32 chars;
 840
 841                 kdb_read(buffer, sizeof(line_buf));
 842
 843                 /* remove the CR kdb includes */
 844                 chars = strlen(buffer) - 1;
 845                 buffer[chars] = '\0';
 846         }
 847 #endif
 848
 849         return 0;
 850 }
 851 #endif                          /*  ACPI_FUTURE_USAGE  */
 852
 853 /* Assumes no unreadable holes inbetween */
 854 u8 acpi_os_readable(void *ptr, acpi_size len)
 855 {
 856 #if defined(__i386__) || defined(__x86_64__)
 857         char tmp;
 858         return !__get_user(tmp, (char __user *)ptr)
 859             && !__get_user(tmp, (char __user *)ptr + len - 1);
 860 #endif
 861         return 1;
 862 }
 863
 864 #ifdef ACPI_FUTURE_USAGE
 865 u8 acpi_os_writable(void *ptr, acpi_size len)
 866 {
 867         /* could do dummy write (racy) or a kernel page table lookup.
 868            The later may be difficult at early boot when kmap doesn't work yet. */
 869         return 1;
 870 }
 871 #endif
 872
 873 acpi_status acpi_os_signal(u32 function, void *info)
 874 {
 875         switch (function) {
 876         case ACPI_SIGNAL_FATAL:
 877                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 878                 break;
 879         case ACPI_SIGNAL_BREAKPOINT:
 880                 /*
 881                  * AML Breakpoint
 882                  * ACPI spec. says to treat it as a NOP unless
 883                  * you are debugging.  So if/when we integrate
 884                  * AML debugger into the kernel debugger its
 885                  * hook will go here.  But until then it is
 886                  * not useful to print anything on breakpoints.
 887                  */
 888                 break;
 889         default:
 890                 break;
 891         }
 892
 893         return AE_OK;
 894 }
 895
 896 EXPORT_SYMBOL(acpi_os_signal);
 897
 898 static int __init acpi_os_name_setup(char *str)
 899 {
 900         char *p = acpi_os_name;
 901         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 902
 903         if (!str || !*str)
 904                 return 0;
 905
 906         for (; count-- && str && *str; str++) {
 907                 if (isalnum(*str) || *str == ' ' || *str == ':')
 908                         *p++ = *str;
 909                 else if (*str == '\'' || *str == '"')
 910                         continue;
 911                 else
 912                         break;
 913         }
 914         *p = 0;
 915
 916         return 1;
 917
 918 }
 919
 920 __setup("acpi_os_name=", acpi_os_name_setup);
 921
 922 /*
 923  * _OSI control
 924  * empty string disables _OSI
 925  * TBD additional string adds to _OSI
 926  */
 927 static int __init acpi_osi_setup(char *str)
 928 {
 929         if (str == NULL || *str == '\0') {
 930                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 931                 acpi_gbl_create_osi_method = FALSE;
 932         } else {
 933                 /* TBD */
 934                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 935                        str);
 936         }
 937
 938         return 1;
 939 }
 940
 941 __setup("acpi_osi=", acpi_osi_setup);
 942
 943 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 944 static int __init acpi_serialize_setup(char *str)
 945 {
 946         printk(KERN_INFO PREFIX "serialize enabled\n");
 947
 948         acpi_gbl_all_methods_serialized = TRUE;
 949
 950         return 1;
 951 }
 952
 953 __setup("acpi_serialize", acpi_serialize_setup);
 954
 955 /*
 956  * Wake and Run-Time GPES are expected to be separate.
 957  * We disable wake-GPEs at run-time to prevent spurious
 958  * interrupts.
 959  *
 960  * However, if a system exists that shares Wake and
 961  * Run-time events on the same GPE this flag is available
 962  * to tell Linux to keep the wake-time GPEs enabled at run-time.
 963  */
 964 static int __init acpi_wake_gpes_always_on_setup(char *str)
 965 {
 966         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
 967
 968         acpi_gbl_leave_wake_gpes_disabled = FALSE;
 969
 970         return 1;
 971 }
 972
 973 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
 974
 975 static int __init acpi_hotkey_setup(char *str)
 976 {
 977         acpi_specific_hotkey_enabled = FALSE;
 978         return 1;
 979 }
 980
 981 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
 982
 983 /*
 984  * max_cstate is defined in the base kernel so modules can
 985  * change it w/o depending on the state of the processor module.
 986  */
 987 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
 988
 989 EXPORT_SYMBOL(max_cstate);
 990
 991 /*
 992  * Acquire a spinlock.
 993  *
 994  * handle is a pointer to the spinlock_t.
 995  */
 996
 997 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
 998 {
 999         acpi_cpu_flags flags;
1000         spin_lock_irqsave(lockp, flags);
1001         return flags;
1002 }
1003
1004 /*
1005  * Release a spinlock. See above.
1006  */
1007
1008 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1009 {
1010         spin_unlock_irqrestore(lockp, flags);
1011 }
1012
1013 #ifndef ACPI_USE_LOCAL_CACHE
1014
1015 /*******************************************************************************
1016  *
1017  * FUNCTION:    acpi_os_create_cache
1018  *
1019  * PARAMETERS:  name      - Ascii name for the cache
1020  *              size      - Size of each cached object
1021  *              depth     - Maximum depth of the cache (in objects) <ignored>
1022  *              cache     - Where the new cache object is returned
1023  *
1024  * RETURN:      status
1025  *
1026  * DESCRIPTION: Create a cache object
1027  *
1028  ******************************************************************************/
1029
1030 acpi_status
1031 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1032 {
1033         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1034         if (cache == NULL)
1035                 return AE_ERROR;
1036         else
1037                 return AE_OK;
1038 }
1039
1040 /*******************************************************************************
1041  *
1042  * FUNCTION:    acpi_os_purge_cache
1043  *
1044  * PARAMETERS:  Cache           - Handle to cache object
1045  *
1046  * RETURN:      Status
1047  *
1048  * DESCRIPTION: Free all objects within the requested cache.
1049  *
1050  ******************************************************************************/
1051
1052 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1053 {
1054         (void)kmem_cache_shrink(cache);
1055         return (AE_OK);
1056 }
1057
1058 /*******************************************************************************
1059  *
1060  * FUNCTION:    acpi_os_delete_cache
1061  *
1062  * PARAMETERS:  Cache           - Handle to cache object
1063  *
1064  * RETURN:      Status
1065  *
1066  * DESCRIPTION: Free all objects within the requested cache and delete the
1067  *              cache object.
1068  *
1069  ******************************************************************************/
1070
1071 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1072 {
1073         kmem_cache_destroy(cache);
1074         return (AE_OK);
1075 }
1076
1077 /*******************************************************************************
1078  *
1079  * FUNCTION:    acpi_os_release_object
1080  *
1081  * PARAMETERS:  Cache       - Handle to cache object
1082  *              Object      - The object to be released
1083  *
1084  * RETURN:      None
1085  *
1086  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1087  *              the object is deleted.
1088  *
1089  ******************************************************************************/
1090
1091 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1092 {
1093         kmem_cache_free(cache, object);
1094         return (AE_OK);
1095 }
1096
1097 /******************************************************************************
1098  *
1099  * FUNCTION:    acpi_os_validate_interface
1100  *
1101  * PARAMETERS:  interface           - Requested interface to be validated
1102  *
1103  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1104  *
1105  * DESCRIPTION: Match an interface string to the interfaces supported by the
1106  *              host. Strings originate from an AML call to the _OSI method.
1107  *
1108  *****************************************************************************/
1109
1110 acpi_status
1111 acpi_os_validate_interface (char *interface)
1112 {
1113
1114     return AE_SUPPORT;
1115 }
1116
1117
1118 /******************************************************************************
1119  *
1120  * FUNCTION:    acpi_os_validate_address
1121  *
1122  * PARAMETERS:  space_id             - ACPI space ID
1123  *              address             - Physical address
1124  *              length              - Address length
1125  *
1126  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1127  *              should return AE_AML_ILLEGAL_ADDRESS.
1128  *
1129  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1130  *              the addresses accessed by AML operation regions.
1131  *
1132  *****************************************************************************/
1133
1134 acpi_status
1135 acpi_os_validate_address (
1136     u8                   space_id,
1137     acpi_physical_address   address,
1138     acpi_size               length)
1139 {
1140
1141     return AE_OK;
1142 }
1143
1144
1145 #endif