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   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 <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 int acpi_specific_hotkey_enabled = TRUE;
  72 EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
  73
  74 static unsigned int acpi_irq_irq;
  75 static acpi_osd_handler acpi_irq_handler;
  76 static void *acpi_irq_context;
  77 static struct workqueue_struct *kacpid_wq;
  78
  79 acpi_status acpi_os_initialize(void)
  80 {
  81         return AE_OK;
  82 }
  83
  84 acpi_status acpi_os_initialize1(void)
  85 {
  86         /*
  87          * Initialize PCI configuration space access, as we'll need to access
  88          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
  89          */
  90         if (!raw_pci_ops) {
  91                 printk(KERN_ERR PREFIX
  92                        "Access to PCI configuration space unavailable\n");
  93                 return AE_NULL_ENTRY;
  94         }
  95         kacpid_wq = create_singlethread_workqueue("kacpid");
  96         BUG_ON(!kacpid_wq);
  97
  98         return AE_OK;
  99 }
 100
 101 acpi_status acpi_os_terminate(void)
 102 {
 103         if (acpi_irq_handler) {
 104                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 105                                                  acpi_irq_handler);
 106         }
 107
 108         destroy_workqueue(kacpid_wq);
 109
 110         return AE_OK;
 111 }
 112
 113 void acpi_os_printf(const char *fmt, ...)
 114 {
 115         va_list args;
 116         va_start(args, fmt);
 117         acpi_os_vprintf(fmt, args);
 118         va_end(args);
 119 }
 120
 121 EXPORT_SYMBOL(acpi_os_printf);
 122
 123 void acpi_os_vprintf(const char *fmt, va_list args)
 124 {
 125         static char buffer[512];
 126
 127         vsprintf(buffer, fmt, args);
 128
 129 #ifdef ENABLE_DEBUGGER
 130         if (acpi_in_debugger) {
 131                 kdb_printf("%s", buffer);
 132         } else {
 133                 printk("%s", buffer);
 134         }
 135 #else
 136         printk("%s", buffer);
 137 #endif
 138 }
 139
 140 acpi_physical_address __init acpi_os_get_root_pointer(void)
 141 {
 142         if (efi_enabled) {
 143                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 144                         return efi.acpi20;
 145                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 146                         return efi.acpi;
 147                 else {
 148                         printk(KERN_ERR PREFIX
 149                                "System description tables not found\n");
 150                         return 0;
 151                 }
 152         } else
 153                 return acpi_find_rsdp();
 154 }
 155
 156 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 157 {
 158         if (phys > ULONG_MAX) {
 159                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 160                 return 0;
 161         }
 162         if (acpi_gbl_permanent_mmap)
 163                 /*
 164                 * ioremap checks to ensure this is in reserved space
 165                 */
 166                 return ioremap((unsigned long)phys, size);
 167         else
 168                 return __acpi_map_table((unsigned long)phys, size);
 169 }
 170 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 171
 172 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 173 {
 174         if (acpi_gbl_permanent_mmap) {
 175                 iounmap(virt);
 176         }
 177 }
 178 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 179
 180 #ifdef ACPI_FUTURE_USAGE
 181 acpi_status
 182 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 183 {
 184         if (!phys || !virt)
 185                 return AE_BAD_PARAMETER;
 186
 187         *phys = virt_to_phys(virt);
 188
 189         return AE_OK;
 190 }
 191 #endif
 192
 193 #define ACPI_MAX_OVERRIDE_LEN 100
 194
 195 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 196
 197 acpi_status
 198 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 199                             acpi_string * new_val)
 200 {
 201         if (!init_val || !new_val)
 202                 return AE_BAD_PARAMETER;
 203
 204         *new_val = NULL;
 205         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 206                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 207                        acpi_os_name);
 208                 *new_val = acpi_os_name;
 209         }
 210
 211         return AE_OK;
 212 }
 213
 214 acpi_status
 215 acpi_os_table_override(struct acpi_table_header * existing_table,
 216                        struct acpi_table_header ** new_table)
 217 {
 218         if (!existing_table || !new_table)
 219                 return AE_BAD_PARAMETER;
 220
 221 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 222         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 223                 *new_table = (struct acpi_table_header *)AmlCode;
 224         else
 225                 *new_table = NULL;
 226 #else
 227         *new_table = NULL;
 228 #endif
 229         return AE_OK;
 230 }
 231
 232 static irqreturn_t acpi_irq(int irq, void *dev_id)
 233 {
 234         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 235 }
 236
 237 acpi_status
 238 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 239                                   void *context)
 240 {
 241         unsigned int irq;
 242
 243         /*
 244          * Ignore the GSI from the core, and use the value in our copy of the
 245          * FADT. It may not be the same if an interrupt source override exists
 246          * for the SCI.
 247          */
 248         gsi = acpi_fadt.sci_int;
 249         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 250                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 251                        gsi);
 252                 return AE_OK;
 253         }
 254
 255         acpi_irq_handler = handler;
 256         acpi_irq_context = context;
 257         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 258                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 259                 return AE_NOT_ACQUIRED;
 260         }
 261         acpi_irq_irq = irq;
 262
 263         return AE_OK;
 264 }
 265
 266 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 267 {
 268         if (irq) {
 269                 free_irq(irq, acpi_irq);
 270                 acpi_irq_handler = NULL;
 271                 acpi_irq_irq = 0;
 272         }
 273
 274         return AE_OK;
 275 }
 276
 277 /*
 278  * Running in interpreter thread context, safe to sleep
 279  */
 280
 281 void acpi_os_sleep(acpi_integer ms)
 282 {
 283         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 284 }
 285
 286 EXPORT_SYMBOL(acpi_os_sleep);
 287
 288 void acpi_os_stall(u32 us)
 289 {
 290         while (us) {
 291                 u32 delay = 1000;
 292
 293                 if (delay > us)
 294                         delay = us;
 295                 udelay(delay);
 296                 touch_nmi_watchdog();
 297                 us -= delay;
 298         }
 299 }
 300
 301 EXPORT_SYMBOL(acpi_os_stall);
 302
 303 /*
 304  * Support ACPI 3.0 AML Timer operand
 305  * Returns 64-bit free-running, monotonically increasing timer
 306  * with 100ns granularity
 307  */
 308 u64 acpi_os_get_timer(void)
 309 {
 310         static u64 t;
 311
 312 #ifdef  CONFIG_HPET
 313         /* TBD: use HPET if available */
 314 #endif
 315
 316 #ifdef  CONFIG_X86_PM_TIMER
 317         /* TBD: default to PM timer if HPET was not available */
 318 #endif
 319         if (!t)
 320                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 321
 322         return ++t;
 323 }
 324
 325 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 326 {
 327         u32 dummy;
 328
 329         if (!value)
 330                 value = &dummy;
 331
 332         switch (width) {
 333         case 8:
 334                 *(u8 *) value = inb(port);
 335                 break;
 336         case 16:
 337                 *(u16 *) value = inw(port);
 338                 break;
 339         case 32:
 340                 *(u32 *) value = inl(port);
 341                 break;
 342         default:
 343                 BUG();
 344         }
 345
 346         return AE_OK;
 347 }
 348
 349 EXPORT_SYMBOL(acpi_os_read_port);
 350
 351 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 352 {
 353         switch (width) {
 354         case 8:
 355                 outb(value, port);
 356                 break;
 357         case 16:
 358                 outw(value, port);
 359                 break;
 360         case 32:
 361                 outl(value, port);
 362                 break;
 363         default:
 364                 BUG();
 365         }
 366
 367         return AE_OK;
 368 }
 369
 370 EXPORT_SYMBOL(acpi_os_write_port);
 371
 372 acpi_status
 373 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 374 {
 375         u32 dummy;
 376         void __iomem *virt_addr;
 377
 378         virt_addr = ioremap(phys_addr, width);
 379         if (!value)
 380                 value = &dummy;
 381
 382         switch (width) {
 383         case 8:
 384                 *(u8 *) value = readb(virt_addr);
 385                 break;
 386         case 16:
 387                 *(u16 *) value = readw(virt_addr);
 388                 break;
 389         case 32:
 390                 *(u32 *) value = readl(virt_addr);
 391                 break;
 392         default:
 393                 BUG();
 394         }
 395
 396         iounmap(virt_addr);
 397
 398         return AE_OK;
 399 }
 400
 401 acpi_status
 402 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 403 {
 404         void __iomem *virt_addr;
 405
 406         virt_addr = ioremap(phys_addr, width);
 407
 408         switch (width) {
 409         case 8:
 410                 writeb(value, virt_addr);
 411                 break;
 412         case 16:
 413                 writew(value, virt_addr);
 414                 break;
 415         case 32:
 416                 writel(value, virt_addr);
 417                 break;
 418         default:
 419                 BUG();
 420         }
 421
 422         iounmap(virt_addr);
 423
 424         return AE_OK;
 425 }
 426
 427 acpi_status
 428 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 429                                void *value, u32 width)
 430 {
 431         int result, size;
 432
 433         if (!value)
 434                 return AE_BAD_PARAMETER;
 435
 436         switch (width) {
 437         case 8:
 438                 size = 1;
 439                 break;
 440         case 16:
 441                 size = 2;
 442                 break;
 443         case 32:
 444                 size = 4;
 445                 break;
 446         default:
 447                 return AE_ERROR;
 448         }
 449
 450         BUG_ON(!raw_pci_ops);
 451
 452         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 453                                    PCI_DEVFN(pci_id->device, pci_id->function),
 454                                    reg, size, value);
 455
 456         return (result ? AE_ERROR : AE_OK);
 457 }
 458
 459 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 460
 461 acpi_status
 462 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 463                                 acpi_integer value, u32 width)
 464 {
 465         int result, size;
 466
 467         switch (width) {
 468         case 8:
 469                 size = 1;
 470                 break;
 471         case 16:
 472                 size = 2;
 473                 break;
 474         case 32:
 475                 size = 4;
 476                 break;
 477         default:
 478                 return AE_ERROR;
 479         }
 480
 481         BUG_ON(!raw_pci_ops);
 482
 483         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 484                                     PCI_DEVFN(pci_id->device, pci_id->function),
 485                                     reg, size, value);
 486
 487         return (result ? AE_ERROR : AE_OK);
 488 }
 489
 490 /* TODO: Change code to take advantage of driver model more */
 491 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 492                                     acpi_handle chandle,        /* current node */
 493                                     struct acpi_pci_id **id,
 494                                     int *is_bridge, u8 * bus_number)
 495 {
 496         acpi_handle handle;
 497         struct acpi_pci_id *pci_id = *id;
 498         acpi_status status;
 499         unsigned long temp;
 500         acpi_object_type type;
 501         u8 tu8;
 502
 503         acpi_get_parent(chandle, &handle);
 504         if (handle != rhandle) {
 505                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 506                                         bus_number);
 507
 508                 status = acpi_get_type(handle, &type);
 509                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 510                         return;
 511
 512                 status =
 513                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 514                                           &temp);
 515                 if (ACPI_SUCCESS(status)) {
 516                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 517                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 518
 519                         if (*is_bridge)
 520                                 pci_id->bus = *bus_number;
 521
 522                         /* any nicer way to get bus number of bridge ? */
 523                         status =
 524                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 525                                                            8);
 526                         if (ACPI_SUCCESS(status)
 527                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 528                                 status =
 529                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 530                                                                    &tu8, 8);
 531                                 if (!ACPI_SUCCESS(status)) {
 532                                         /* Certainly broken...  FIX ME */
 533                                         return;
 534                                 }
 535                                 *is_bridge = 1;
 536                                 pci_id->bus = tu8;
 537                                 status =
 538                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 539                                                                    &tu8, 8);
 540                                 if (ACPI_SUCCESS(status)) {
 541                                         *bus_number = tu8;
 542                                 }
 543                         } else
 544                                 *is_bridge = 0;
 545                 }
 546         }
 547 }
 548
 549 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 550                            acpi_handle chandle, /* current node */
 551                            struct acpi_pci_id **id)
 552 {
 553         int is_bridge = 1;
 554         u8 bus_number = (*id)->bus;
 555
 556         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 557 }
 558
 559 static void acpi_os_execute_deferred(struct work_struct *work)
 560 {
 561         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 562
 563         if (!dpc) {
 564                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 565                 return;
 566         }
 567
 568         dpc->function(dpc->context);
 569
 570         kfree(dpc);
 571
 572         return;
 573 }
 574
 575 /*******************************************************************************
 576  *
 577  * FUNCTION:    acpi_os_execute
 578  *
 579  * PARAMETERS:  Type               - Type of the callback
 580  *              Function           - Function to be executed
 581  *              Context            - Function parameters
 582  *
 583  * RETURN:      Status
 584  *
 585  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 586  *              immediately executes function on a separate thread.
 587  *
 588  ******************************************************************************/
 589
 590 acpi_status acpi_os_execute(acpi_execute_type type,
 591                             acpi_osd_exec_callback function, void *context)
 592 {
 593         acpi_status status = AE_OK;
 594         struct acpi_os_dpc *dpc;
 595
 596         ACPI_FUNCTION_TRACE("os_queue_for_execution");
 597
 598         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 599                           "Scheduling function [%p(%p)] for deferred execution.\n",
 600                           function, context));
 601
 602         if (!function)
 603                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 604
 605         /*
 606          * Allocate/initialize DPC structure.  Note that this memory will be
 607          * freed by the callee.  The kernel handles the work_struct list  in a
 608          * way that allows us to also free its memory inside the callee.
 609          * Because we may want to schedule several tasks with different
 610          * parameters we can't use the approach some kernel code uses of
 611          * having a static work_struct.
 612          */
 613
 614         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 615         if (!dpc)
 616                 return_ACPI_STATUS(AE_NO_MEMORY);
 617
 618         dpc->function = function;
 619         dpc->context = context;
 620
 621         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 622         if (!queue_work(kacpid_wq, &dpc->work)) {
 623                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 624                                   "Call to queue_work() failed.\n"));
 625                 kfree(dpc);
 626                 status = AE_ERROR;
 627         }
 628
 629         return_ACPI_STATUS(status);
 630 }
 631
 632 EXPORT_SYMBOL(acpi_os_execute);
 633
 634 void acpi_os_wait_events_complete(void *context)
 635 {
 636         flush_workqueue(kacpid_wq);
 637 }
 638
 639 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 640
 641 /*
 642  * Allocate the memory for a spinlock and initialize it.
 643  */
 644 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 645 {
 646         spin_lock_init(*handle);
 647
 648         return AE_OK;
 649 }
 650
 651 /*
 652  * Deallocate the memory for a spinlock.
 653  */
 654 void acpi_os_delete_lock(acpi_spinlock handle)
 655 {
 656         return;
 657 }
 658
 659 acpi_status
 660 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 661 {
 662         struct semaphore *sem = NULL;
 663
 664
 665         sem = acpi_os_allocate(sizeof(struct semaphore));
 666         if (!sem)
 667                 return AE_NO_MEMORY;
 668         memset(sem, 0, sizeof(struct semaphore));
 669
 670         sema_init(sem, initial_units);
 671
 672         *handle = (acpi_handle *) sem;
 673
 674         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 675                           *handle, initial_units));
 676
 677         return AE_OK;
 678 }
 679
 680 EXPORT_SYMBOL(acpi_os_create_semaphore);
 681
 682 /*
 683  * TODO: A better way to delete semaphores?  Linux doesn't have a
 684  * 'delete_semaphore()' function -- may result in an invalid
 685  * pointer dereference for non-synchronized consumers.  Should
 686  * we at least check for blocked threads and signal/cancel them?
 687  */
 688
 689 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 690 {
 691         struct semaphore *sem = (struct semaphore *)handle;
 692
 693
 694         if (!sem)
 695                 return AE_BAD_PARAMETER;
 696
 697         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 698
 699         kfree(sem);
 700         sem = NULL;
 701
 702         return AE_OK;
 703 }
 704
 705 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 706
 707 /*
 708  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 709  * improvise.  The process is to sleep for one scheduler quantum
 710  * until the semaphore becomes available.  Downside is that this
 711  * may result in starvation for timeout-based waits when there's
 712  * lots of semaphore activity.
 713  *
 714  * TODO: Support for units > 1?
 715  */
 716 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 717 {
 718         acpi_status status = AE_OK;
 719         struct semaphore *sem = (struct semaphore *)handle;
 720         int ret = 0;
 721
 722
 723         if (!sem || (units < 1))
 724                 return AE_BAD_PARAMETER;
 725
 726         if (units > 1)
 727                 return AE_SUPPORT;
 728
 729         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 730                           handle, units, timeout));
 731
 732         /*
 733          * This can be called during resume with interrupts off.
 734          * Like boot-time, we should be single threaded and will
 735          * always get the lock if we try -- timeout or not.
 736          * If this doesn't succeed, then we will oops courtesy of
 737          * might_sleep() in down().
 738          */
 739         if (!down_trylock(sem))
 740                 return AE_OK;
 741
 742         switch (timeout) {
 743                 /*
 744                  * No Wait:
 745                  * --------
 746                  * A zero timeout value indicates that we shouldn't wait - just
 747                  * acquire the semaphore if available otherwise return AE_TIME
 748                  * (a.k.a. 'would block').
 749                  */
 750         case 0:
 751                 if (down_trylock(sem))
 752                         status = AE_TIME;
 753                 break;
 754
 755                 /*
 756                  * Wait Indefinitely:
 757                  * ------------------
 758                  */
 759         case ACPI_WAIT_FOREVER:
 760                 down(sem);
 761                 break;
 762
 763                 /*
 764                  * Wait w/ Timeout:
 765                  * ----------------
 766                  */
 767         default:
 768                 // TODO: A better timeout algorithm?
 769                 {
 770                         int i = 0;
 771                         static const int quantum_ms = 1000 / HZ;
 772
 773                         ret = down_trylock(sem);
 774                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 775                                 schedule_timeout_interruptible(1);
 776                                 ret = down_trylock(sem);
 777                         }
 778
 779                         if (ret != 0)
 780                                 status = AE_TIME;
 781                 }
 782                 break;
 783         }
 784
 785         if (ACPI_FAILURE(status)) {
 786                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 787                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 788                                   handle, units, timeout,
 789                                   acpi_format_exception(status)));
 790         } else {
 791                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 792                                   "Acquired semaphore[%p|%d|%d]", handle,
 793                                   units, timeout));
 794         }
 795
 796         return status;
 797 }
 798
 799 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 800
 801 /*
 802  * TODO: Support for units > 1?
 803  */
 804 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 805 {
 806         struct semaphore *sem = (struct semaphore *)handle;
 807
 808
 809         if (!sem || (units < 1))
 810                 return AE_BAD_PARAMETER;
 811
 812         if (units > 1)
 813                 return AE_SUPPORT;
 814
 815         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 816                           units));
 817
 818         up(sem);
 819
 820         return AE_OK;
 821 }
 822
 823 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 824
 825 #ifdef ACPI_FUTURE_USAGE
 826 u32 acpi_os_get_line(char *buffer)
 827 {
 828
 829 #ifdef ENABLE_DEBUGGER
 830         if (acpi_in_debugger) {
 831                 u32 chars;
 832
 833                 kdb_read(buffer, sizeof(line_buf));
 834
 835                 /* remove the CR kdb includes */
 836                 chars = strlen(buffer) - 1;
 837                 buffer[chars] = '\0';
 838         }
 839 #endif
 840
 841         return 0;
 842 }
 843 #endif                          /*  ACPI_FUTURE_USAGE  */
 844
 845 /* Assumes no unreadable holes inbetween */
 846 u8 acpi_os_readable(void *ptr, acpi_size len)
 847 {
 848 #if defined(__i386__) || defined(__x86_64__)
 849         char tmp;
 850         return !__get_user(tmp, (char __user *)ptr)
 851             && !__get_user(tmp, (char __user *)ptr + len - 1);
 852 #endif
 853         return 1;
 854 }
 855
 856 #ifdef ACPI_FUTURE_USAGE
 857 u8 acpi_os_writable(void *ptr, acpi_size len)
 858 {
 859         /* could do dummy write (racy) or a kernel page table lookup.
 860            The later may be difficult at early boot when kmap doesn't work yet. */
 861         return 1;
 862 }
 863 #endif
 864
 865 acpi_status acpi_os_signal(u32 function, void *info)
 866 {
 867         switch (function) {
 868         case ACPI_SIGNAL_FATAL:
 869                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 870                 break;
 871         case ACPI_SIGNAL_BREAKPOINT:
 872                 /*
 873                  * AML Breakpoint
 874                  * ACPI spec. says to treat it as a NOP unless
 875                  * you are debugging.  So if/when we integrate
 876                  * AML debugger into the kernel debugger its
 877                  * hook will go here.  But until then it is
 878                  * not useful to print anything on breakpoints.
 879                  */
 880                 break;
 881         default:
 882                 break;
 883         }
 884
 885         return AE_OK;
 886 }
 887
 888 EXPORT_SYMBOL(acpi_os_signal);
 889
 890 static int __init acpi_os_name_setup(char *str)
 891 {
 892         char *p = acpi_os_name;
 893         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 894
 895         if (!str || !*str)
 896                 return 0;
 897
 898         for (; count-- && str && *str; str++) {
 899                 if (isalnum(*str) || *str == ' ' || *str == ':')
 900                         *p++ = *str;
 901                 else if (*str == '\'' || *str == '"')
 902                         continue;
 903                 else
 904                         break;
 905         }
 906         *p = 0;
 907
 908         return 1;
 909
 910 }
 911
 912 __setup("acpi_os_name=", acpi_os_name_setup);
 913
 914 /*
 915  * _OSI control
 916  * empty string disables _OSI
 917  * TBD additional string adds to _OSI
 918  */
 919 static int __init acpi_osi_setup(char *str)
 920 {
 921         if (str == NULL || *str == '\0') {
 922                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 923                 acpi_gbl_create_osi_method = FALSE;
 924         } else {
 925                 /* TBD */
 926                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 927                        str);
 928         }
 929
 930         return 1;
 931 }
 932
 933 __setup("acpi_osi=", acpi_osi_setup);
 934
 935 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 936 static int __init acpi_serialize_setup(char *str)
 937 {
 938         printk(KERN_INFO PREFIX "serialize enabled\n");
 939
 940         acpi_gbl_all_methods_serialized = TRUE;
 941
 942         return 1;
 943 }
 944
 945 __setup("acpi_serialize", acpi_serialize_setup);
 946
 947 /*
 948  * Wake and Run-Time GPES are expected to be separate.
 949  * We disable wake-GPEs at run-time to prevent spurious
 950  * interrupts.
 951  *
 952  * However, if a system exists that shares Wake and
 953  * Run-time events on the same GPE this flag is available
 954  * to tell Linux to keep the wake-time GPEs enabled at run-time.
 955  */
 956 static int __init acpi_wake_gpes_always_on_setup(char *str)
 957 {
 958         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
 959
 960         acpi_gbl_leave_wake_gpes_disabled = FALSE;
 961
 962         return 1;
 963 }
 964
 965 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
 966
 967 static int __init acpi_hotkey_setup(char *str)
 968 {
 969         acpi_specific_hotkey_enabled = FALSE;
 970         return 1;
 971 }
 972
 973 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
 974
 975 /*
 976  * max_cstate is defined in the base kernel so modules can
 977  * change it w/o depending on the state of the processor module.
 978  */
 979 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
 980
 981 EXPORT_SYMBOL(max_cstate);
 982
 983 /*
 984  * Acquire a spinlock.
 985  *
 986  * handle is a pointer to the spinlock_t.
 987  */
 988
 989 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
 990 {
 991         acpi_cpu_flags flags;
 992         spin_lock_irqsave(lockp, flags);
 993         return flags;
 994 }
 995
 996 /*
 997  * Release a spinlock. See above.
 998  */
 999
1000 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1001 {
1002         spin_unlock_irqrestore(lockp, flags);
1003 }
1004
1005 #ifndef ACPI_USE_LOCAL_CACHE
1006
1007 /*******************************************************************************
1008  *
1009  * FUNCTION:    acpi_os_create_cache
1010  *
1011  * PARAMETERS:  name      - Ascii name for the cache
1012  *              size      - Size of each cached object
1013  *              depth     - Maximum depth of the cache (in objects) <ignored>
1014  *              cache     - Where the new cache object is returned
1015  *
1016  * RETURN:      status
1017  *
1018  * DESCRIPTION: Create a cache object
1019  *
1020  ******************************************************************************/
1021
1022 acpi_status
1023 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1024 {
1025         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1026         if (*cache == NULL)
1027                 return AE_ERROR;
1028         else
1029                 return AE_OK;
1030 }
1031
1032 /*******************************************************************************
1033  *
1034  * FUNCTION:    acpi_os_purge_cache
1035  *
1036  * PARAMETERS:  Cache           - Handle to cache object
1037  *
1038  * RETURN:      Status
1039  *
1040  * DESCRIPTION: Free all objects within the requested cache.
1041  *
1042  ******************************************************************************/
1043
1044 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1045 {
1046         kmem_cache_shrink(cache);
1047         return (AE_OK);
1048 }
1049
1050 /*******************************************************************************
1051  *
1052  * FUNCTION:    acpi_os_delete_cache
1053  *
1054  * PARAMETERS:  Cache           - Handle to cache object
1055  *
1056  * RETURN:      Status
1057  *
1058  * DESCRIPTION: Free all objects within the requested cache and delete the
1059  *              cache object.
1060  *
1061  ******************************************************************************/
1062
1063 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1064 {
1065         kmem_cache_destroy(cache);
1066         return (AE_OK);
1067 }
1068
1069 /*******************************************************************************
1070  *
1071  * FUNCTION:    acpi_os_release_object
1072  *
1073  * PARAMETERS:  Cache       - Handle to cache object
1074  *              Object      - The object to be released
1075  *
1076  * RETURN:      None
1077  *
1078  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1079  *              the object is deleted.
1080  *
1081  ******************************************************************************/
1082
1083 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1084 {
1085         kmem_cache_free(cache, object);
1086         return (AE_OK);
1087 }
1088
1089 /******************************************************************************
1090  *
1091  * FUNCTION:    acpi_os_validate_interface
1092  *
1093  * PARAMETERS:  interface           - Requested interface to be validated
1094  *
1095  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1096  *
1097  * DESCRIPTION: Match an interface string to the interfaces supported by the
1098  *              host. Strings originate from an AML call to the _OSI method.
1099  *
1100  *****************************************************************************/
1101
1102 acpi_status
1103 acpi_os_validate_interface (char *interface)
1104 {
1105
1106     return AE_SUPPORT;
1107 }
1108
1109
1110 /******************************************************************************
1111  *
1112  * FUNCTION:    acpi_os_validate_address
1113  *
1114  * PARAMETERS:  space_id             - ACPI space ID
1115  *              address             - Physical address
1116  *              length              - Address length
1117  *
1118  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1119  *              should return AE_AML_ILLEGAL_ADDRESS.
1120  *
1121  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1122  *              the addresses accessed by AML operation regions.
1123  *
1124  *****************************************************************************/
1125
1126 acpi_status
1127 acpi_os_validate_address (
1128     u8                   space_id,
1129     acpi_physical_address   address,
1130     acpi_size               length)
1131 {
1132
1133     return AE_OK;
1134 }
1135
1136
1137 #endif