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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 <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 };
  54
  55 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  56 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  57 #endif
  58
  59 #ifdef ENABLE_DEBUGGER
  60 #include <linux/kdb.h>
  61
  62 /* stuff for debugger support */
  63 int acpi_in_debugger;
  64 EXPORT_SYMBOL(acpi_in_debugger);
  65
  66 extern char line_buf[80];
  67 #endif                          /*ENABLE_DEBUGGER */
  68
  69 int acpi_specific_hotkey_enabled = TRUE;
  70 EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
  71
  72 static unsigned int acpi_irq_irq;
  73 static acpi_osd_handler acpi_irq_handler;
  74 static void *acpi_irq_context;
  75 static struct workqueue_struct *kacpid_wq;
  76
  77 acpi_status acpi_os_initialize(void)
  78 {
  79         return AE_OK;
  80 }
  81
  82 acpi_status acpi_os_initialize1(void)
  83 {
  84         /*
  85          * Initialize PCI configuration space access, as we'll need to access
  86          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
  87          */
  88         if (!raw_pci_ops) {
  89                 printk(KERN_ERR PREFIX
  90                        "Access to PCI configuration space unavailable\n");
  91                 return AE_NULL_ENTRY;
  92         }
  93         kacpid_wq = create_singlethread_workqueue("kacpid");
  94         BUG_ON(!kacpid_wq);
  95
  96         return AE_OK;
  97 }
  98
  99 acpi_status acpi_os_terminate(void)
 100 {
 101         if (acpi_irq_handler) {
 102                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 103                                                  acpi_irq_handler);
 104         }
 105
 106         destroy_workqueue(kacpid_wq);
 107
 108         return AE_OK;
 109 }
 110
 111 void acpi_os_printf(const char *fmt, ...)
 112 {
 113         va_list args;
 114         va_start(args, fmt);
 115         acpi_os_vprintf(fmt, args);
 116         va_end(args);
 117 }
 118
 119 EXPORT_SYMBOL(acpi_os_printf);
 120
 121 void acpi_os_vprintf(const char *fmt, va_list args)
 122 {
 123         static char buffer[512];
 124
 125         vsprintf(buffer, fmt, args);
 126
 127 #ifdef ENABLE_DEBUGGER
 128         if (acpi_in_debugger) {
 129                 kdb_printf("%s", buffer);
 130         } else {
 131                 printk("%s", buffer);
 132         }
 133 #else
 134         printk("%s", buffer);
 135 #endif
 136 }
 137
 138 acpi_status acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
 139 {
 140         if (efi_enabled) {
 141                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
 142                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 143                         addr->pointer.physical = efi.acpi20;
 144                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 145                         addr->pointer.physical = efi.acpi;
 146                 else {
 147                         printk(KERN_ERR PREFIX
 148                                "System description tables not found\n");
 149                         return AE_NOT_FOUND;
 150                 }
 151         } else {
 152                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
 153                         printk(KERN_ERR PREFIX
 154                                "System description tables not found\n");
 155                         return AE_NOT_FOUND;
 156                 }
 157         }
 158
 159         return AE_OK;
 160 }
 161
 162 acpi_status
 163 acpi_os_map_memory(acpi_physical_address phys, acpi_size size,
 164                    void __iomem ** virt)
 165 {
 166         if (phys > ULONG_MAX) {
 167                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 168                 return AE_BAD_PARAMETER;
 169         }
 170         /*
 171          * ioremap checks to ensure this is in reserved space
 172          */
 173         *virt = ioremap((unsigned long)phys, size);
 174
 175         if (!*virt)
 176                 return AE_NO_MEMORY;
 177
 178         return AE_OK;
 179 }
 180 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 181
 182 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 183 {
 184         iounmap(virt);
 185 }
 186 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 187
 188 #ifdef ACPI_FUTURE_USAGE
 189 acpi_status
 190 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 191 {
 192         if (!phys || !virt)
 193                 return AE_BAD_PARAMETER;
 194
 195         *phys = virt_to_phys(virt);
 196
 197         return AE_OK;
 198 }
 199 #endif
 200
 201 #define ACPI_MAX_OVERRIDE_LEN 100
 202
 203 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 204
 205 acpi_status
 206 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 207                             acpi_string * new_val)
 208 {
 209         if (!init_val || !new_val)
 210                 return AE_BAD_PARAMETER;
 211
 212         *new_val = NULL;
 213         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 214                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 215                        acpi_os_name);
 216                 *new_val = acpi_os_name;
 217         }
 218
 219         return AE_OK;
 220 }
 221
 222 acpi_status
 223 acpi_os_table_override(struct acpi_table_header * existing_table,
 224                        struct acpi_table_header ** new_table)
 225 {
 226         if (!existing_table || !new_table)
 227                 return AE_BAD_PARAMETER;
 228
 229 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 230         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 231                 *new_table = (struct acpi_table_header *)AmlCode;
 232         else
 233                 *new_table = NULL;
 234 #else
 235         *new_table = NULL;
 236 #endif
 237         return AE_OK;
 238 }
 239
 240 static irqreturn_t acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
 241 {
 242         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 243 }
 244
 245 acpi_status
 246 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 247                                   void *context)
 248 {
 249         unsigned int irq;
 250
 251         /*
 252          * Ignore the GSI from the core, and use the value in our copy of the
 253          * FADT. It may not be the same if an interrupt source override exists
 254          * for the SCI.
 255          */
 256         gsi = acpi_fadt.sci_int;
 257         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 258                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 259                        gsi);
 260                 return AE_OK;
 261         }
 262
 263         acpi_irq_handler = handler;
 264         acpi_irq_context = context;
 265         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 266                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 267                 return AE_NOT_ACQUIRED;
 268         }
 269         acpi_irq_irq = irq;
 270
 271         return AE_OK;
 272 }
 273
 274 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 275 {
 276         if (irq) {
 277                 free_irq(irq, acpi_irq);
 278                 acpi_irq_handler = NULL;
 279                 acpi_irq_irq = 0;
 280         }
 281
 282         return AE_OK;
 283 }
 284
 285 /*
 286  * Running in interpreter thread context, safe to sleep
 287  */
 288
 289 void acpi_os_sleep(acpi_integer ms)
 290 {
 291         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 292 }
 293
 294 EXPORT_SYMBOL(acpi_os_sleep);
 295
 296 void acpi_os_stall(u32 us)
 297 {
 298         while (us) {
 299                 u32 delay = 1000;
 300
 301                 if (delay > us)
 302                         delay = us;
 303                 udelay(delay);
 304                 touch_nmi_watchdog();
 305                 us -= delay;
 306         }
 307 }
 308
 309 EXPORT_SYMBOL(acpi_os_stall);
 310
 311 /*
 312  * Support ACPI 3.0 AML Timer operand
 313  * Returns 64-bit free-running, monotonically increasing timer
 314  * with 100ns granularity
 315  */
 316 u64 acpi_os_get_timer(void)
 317 {
 318         static u64 t;
 319
 320 #ifdef  CONFIG_HPET
 321         /* TBD: use HPET if available */
 322 #endif
 323
 324 #ifdef  CONFIG_X86_PM_TIMER
 325         /* TBD: default to PM timer if HPET was not available */
 326 #endif
 327         if (!t)
 328                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 329
 330         return ++t;
 331 }
 332
 333 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 334 {
 335         u32 dummy;
 336
 337         if (!value)
 338                 value = &dummy;
 339
 340         switch (width) {
 341         case 8:
 342                 *(u8 *) value = inb(port);
 343                 break;
 344         case 16:
 345                 *(u16 *) value = inw(port);
 346                 break;
 347         case 32:
 348                 *(u32 *) value = inl(port);
 349                 break;
 350         default:
 351                 BUG();
 352         }
 353
 354         return AE_OK;
 355 }
 356
 357 EXPORT_SYMBOL(acpi_os_read_port);
 358
 359 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 360 {
 361         switch (width) {
 362         case 8:
 363                 outb(value, port);
 364                 break;
 365         case 16:
 366                 outw(value, port);
 367                 break;
 368         case 32:
 369                 outl(value, port);
 370                 break;
 371         default:
 372                 BUG();
 373         }
 374
 375         return AE_OK;
 376 }
 377
 378 EXPORT_SYMBOL(acpi_os_write_port);
 379
 380 acpi_status
 381 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 382 {
 383         u32 dummy;
 384         void __iomem *virt_addr;
 385
 386         virt_addr = ioremap(phys_addr, width);
 387         if (!value)
 388                 value = &dummy;
 389
 390         switch (width) {
 391         case 8:
 392                 *(u8 *) value = readb(virt_addr);
 393                 break;
 394         case 16:
 395                 *(u16 *) value = readw(virt_addr);
 396                 break;
 397         case 32:
 398                 *(u32 *) value = readl(virt_addr);
 399                 break;
 400         default:
 401                 BUG();
 402         }
 403
 404         iounmap(virt_addr);
 405
 406         return AE_OK;
 407 }
 408
 409 acpi_status
 410 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 411 {
 412         void __iomem *virt_addr;
 413
 414         virt_addr = ioremap(phys_addr, width);
 415
 416         switch (width) {
 417         case 8:
 418                 writeb(value, virt_addr);
 419                 break;
 420         case 16:
 421                 writew(value, virt_addr);
 422                 break;
 423         case 32:
 424                 writel(value, virt_addr);
 425                 break;
 426         default:
 427                 BUG();
 428         }
 429
 430         iounmap(virt_addr);
 431
 432         return AE_OK;
 433 }
 434
 435 acpi_status
 436 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 437                                void *value, u32 width)
 438 {
 439         int result, size;
 440
 441         if (!value)
 442                 return AE_BAD_PARAMETER;
 443
 444         switch (width) {
 445         case 8:
 446                 size = 1;
 447                 break;
 448         case 16:
 449                 size = 2;
 450                 break;
 451         case 32:
 452                 size = 4;
 453                 break;
 454         default:
 455                 return AE_ERROR;
 456         }
 457
 458         BUG_ON(!raw_pci_ops);
 459
 460         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 461                                    PCI_DEVFN(pci_id->device, pci_id->function),
 462                                    reg, size, value);
 463
 464         return (result ? AE_ERROR : AE_OK);
 465 }
 466
 467 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 468
 469 acpi_status
 470 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 471                                 acpi_integer value, u32 width)
 472 {
 473         int result, size;
 474
 475         switch (width) {
 476         case 8:
 477                 size = 1;
 478                 break;
 479         case 16:
 480                 size = 2;
 481                 break;
 482         case 32:
 483                 size = 4;
 484                 break;
 485         default:
 486                 return AE_ERROR;
 487         }
 488
 489         BUG_ON(!raw_pci_ops);
 490
 491         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 492                                     PCI_DEVFN(pci_id->device, pci_id->function),
 493                                     reg, size, value);
 494
 495         return (result ? AE_ERROR : AE_OK);
 496 }
 497
 498 /* TODO: Change code to take advantage of driver model more */
 499 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 500                                     acpi_handle chandle,        /* current node */
 501                                     struct acpi_pci_id **id,
 502                                     int *is_bridge, u8 * bus_number)
 503 {
 504         acpi_handle handle;
 505         struct acpi_pci_id *pci_id = *id;
 506         acpi_status status;
 507         unsigned long temp;
 508         acpi_object_type type;
 509         u8 tu8;
 510
 511         acpi_get_parent(chandle, &handle);
 512         if (handle != rhandle) {
 513                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 514                                         bus_number);
 515
 516                 status = acpi_get_type(handle, &type);
 517                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 518                         return;
 519
 520                 status =
 521                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 522                                           &temp);
 523                 if (ACPI_SUCCESS(status)) {
 524                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 525                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 526
 527                         if (*is_bridge)
 528                                 pci_id->bus = *bus_number;
 529
 530                         /* any nicer way to get bus number of bridge ? */
 531                         status =
 532                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 533                                                            8);
 534                         if (ACPI_SUCCESS(status)
 535                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 536                                 status =
 537                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 538                                                                    &tu8, 8);
 539                                 if (!ACPI_SUCCESS(status)) {
 540                                         /* Certainly broken...  FIX ME */
 541                                         return;
 542                                 }
 543                                 *is_bridge = 1;
 544                                 pci_id->bus = tu8;
 545                                 status =
 546                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 547                                                                    &tu8, 8);
 548                                 if (ACPI_SUCCESS(status)) {
 549                                         *bus_number = tu8;
 550                                 }
 551                         } else
 552                                 *is_bridge = 0;
 553                 }
 554         }
 555 }
 556
 557 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 558                            acpi_handle chandle, /* current node */
 559                            struct acpi_pci_id **id)
 560 {
 561         int is_bridge = 1;
 562         u8 bus_number = (*id)->bus;
 563
 564         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 565 }
 566
 567 static void acpi_os_execute_deferred(void *context)
 568 {
 569         struct acpi_os_dpc *dpc = NULL;
 570
 571
 572         dpc = (struct acpi_os_dpc *)context;
 573         if (!dpc) {
 574                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 575                 return;
 576         }
 577
 578         dpc->function(dpc->context);
 579
 580         kfree(dpc);
 581
 582         return;
 583 }
 584
 585 /*******************************************************************************
 586  *
 587  * FUNCTION:    acpi_os_execute
 588  *
 589  * PARAMETERS:  Type               - Type of the callback
 590  *              Function           - Function to be executed
 591  *              Context            - Function parameters
 592  *
 593  * RETURN:      Status
 594  *
 595  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 596  *              immediately executes function on a separate thread.
 597  *
 598  ******************************************************************************/
 599
 600 acpi_status acpi_os_execute(acpi_execute_type type,
 601                             acpi_osd_exec_callback function, void *context)
 602 {
 603         acpi_status status = AE_OK;
 604         struct acpi_os_dpc *dpc;
 605         struct work_struct *task;
 606
 607         ACPI_FUNCTION_TRACE("os_queue_for_execution");
 608
 609         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 610                           "Scheduling function [%p(%p)] for deferred execution.\n",
 611                           function, context));
 612
 613         if (!function)
 614                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 615
 616         /*
 617          * Allocate/initialize DPC structure.  Note that this memory will be
 618          * freed by the callee.  The kernel handles the tq_struct list  in a
 619          * way that allows us to also free its memory inside the callee.
 620          * Because we may want to schedule several tasks with different
 621          * parameters we can't use the approach some kernel code uses of
 622          * having a static tq_struct.
 623          * We can save time and code by allocating the DPC and tq_structs
 624          * from the same memory.
 625          */
 626
 627         dpc =
 628             kmalloc(sizeof(struct acpi_os_dpc) + sizeof(struct work_struct),
 629                     GFP_ATOMIC);
 630         if (!dpc)
 631                 return_ACPI_STATUS(AE_NO_MEMORY);
 632
 633         dpc->function = function;
 634         dpc->context = context;
 635
 636         task = (void *)(dpc + 1);
 637         INIT_WORK(task, acpi_os_execute_deferred, (void *)dpc);
 638
 639         if (!queue_work(kacpid_wq, task)) {
 640                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 641                                   "Call to queue_work() failed.\n"));
 642                 kfree(dpc);
 643                 status = AE_ERROR;
 644         }
 645
 646         return_ACPI_STATUS(status);
 647 }
 648
 649 EXPORT_SYMBOL(acpi_os_execute);
 650
 651 void acpi_os_wait_events_complete(void *context)
 652 {
 653         flush_workqueue(kacpid_wq);
 654 }
 655
 656 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 657
 658 /*
 659  * Allocate the memory for a spinlock and initialize it.
 660  */
 661 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 662 {
 663         spin_lock_init(*handle);
 664
 665         return AE_OK;
 666 }
 667
 668 /*
 669  * Deallocate the memory for a spinlock.
 670  */
 671 void acpi_os_delete_lock(acpi_spinlock handle)
 672 {
 673         return;
 674 }
 675
 676 acpi_status
 677 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 678 {
 679         struct semaphore *sem = NULL;
 680
 681
 682         sem = acpi_os_allocate(sizeof(struct semaphore));
 683         if (!sem)
 684                 return AE_NO_MEMORY;
 685         memset(sem, 0, sizeof(struct semaphore));
 686
 687         sema_init(sem, initial_units);
 688
 689         *handle = (acpi_handle *) sem;
 690
 691         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 692                           *handle, initial_units));
 693
 694         return AE_OK;
 695 }
 696
 697 EXPORT_SYMBOL(acpi_os_create_semaphore);
 698
 699 /*
 700  * TODO: A better way to delete semaphores?  Linux doesn't have a
 701  * 'delete_semaphore()' function -- may result in an invalid
 702  * pointer dereference for non-synchronized consumers.  Should
 703  * we at least check for blocked threads and signal/cancel them?
 704  */
 705
 706 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 707 {
 708         struct semaphore *sem = (struct semaphore *)handle;
 709
 710
 711         if (!sem)
 712                 return AE_BAD_PARAMETER;
 713
 714         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 715
 716         kfree(sem);
 717         sem = NULL;
 718
 719         return AE_OK;
 720 }
 721
 722 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 723
 724 /*
 725  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 726  * improvise.  The process is to sleep for one scheduler quantum
 727  * until the semaphore becomes available.  Downside is that this
 728  * may result in starvation for timeout-based waits when there's
 729  * lots of semaphore activity.
 730  *
 731  * TODO: Support for units > 1?
 732  */
 733 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 734 {
 735         acpi_status status = AE_OK;
 736         struct semaphore *sem = (struct semaphore *)handle;
 737         int ret = 0;
 738
 739
 740         if (!sem || (units < 1))
 741                 return AE_BAD_PARAMETER;
 742
 743         if (units > 1)
 744                 return AE_SUPPORT;
 745
 746         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 747                           handle, units, timeout));
 748
 749         /*
 750          * This can be called during resume with interrupts off.
 751          * Like boot-time, we should be single threaded and will
 752          * always get the lock if we try -- timeout or not.
 753          * If this doesn't succeed, then we will oops courtesy of
 754          * might_sleep() in down().
 755          */
 756         if (!down_trylock(sem))
 757                 return AE_OK;
 758
 759         switch (timeout) {
 760                 /*
 761                  * No Wait:
 762                  * --------
 763                  * A zero timeout value indicates that we shouldn't wait - just
 764                  * acquire the semaphore if available otherwise return AE_TIME
 765                  * (a.k.a. 'would block').
 766                  */
 767         case 0:
 768                 if (down_trylock(sem))
 769                         status = AE_TIME;
 770                 break;
 771
 772                 /*
 773                  * Wait Indefinitely:
 774                  * ------------------
 775                  */
 776         case ACPI_WAIT_FOREVER:
 777                 down(sem);
 778                 break;
 779
 780                 /*
 781                  * Wait w/ Timeout:
 782                  * ----------------
 783                  */
 784         default:
 785                 // TODO: A better timeout algorithm?
 786                 {
 787                         int i = 0;
 788                         static const int quantum_ms = 1000 / HZ;
 789
 790                         ret = down_trylock(sem);
 791                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 792                                 schedule_timeout_interruptible(1);
 793                                 ret = down_trylock(sem);
 794                         }
 795
 796                         if (ret != 0)
 797                                 status = AE_TIME;
 798                 }
 799                 break;
 800         }
 801
 802         if (ACPI_FAILURE(status)) {
 803                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 804                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 805                                   handle, units, timeout,
 806                                   acpi_format_exception(status)));
 807         } else {
 808                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 809                                   "Acquired semaphore[%p|%d|%d]", handle,
 810                                   units, timeout));
 811         }
 812
 813         return status;
 814 }
 815
 816 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 817
 818 /*
 819  * TODO: Support for units > 1?
 820  */
 821 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 822 {
 823         struct semaphore *sem = (struct semaphore *)handle;
 824
 825
 826         if (!sem || (units < 1))
 827                 return AE_BAD_PARAMETER;
 828
 829         if (units > 1)
 830                 return AE_SUPPORT;
 831
 832         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 833                           units));
 834
 835         up(sem);
 836
 837         return AE_OK;
 838 }
 839
 840 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 841
 842 #ifdef ACPI_FUTURE_USAGE
 843 u32 acpi_os_get_line(char *buffer)
 844 {
 845
 846 #ifdef ENABLE_DEBUGGER
 847         if (acpi_in_debugger) {
 848                 u32 chars;
 849
 850                 kdb_read(buffer, sizeof(line_buf));
 851
 852                 /* remove the CR kdb includes */
 853                 chars = strlen(buffer) - 1;
 854                 buffer[chars] = '\0';
 855         }
 856 #endif
 857
 858         return 0;
 859 }
 860 #endif                          /*  ACPI_FUTURE_USAGE  */
 861
 862 /* Assumes no unreadable holes inbetween */
 863 u8 acpi_os_readable(void *ptr, acpi_size len)
 864 {
 865 #if defined(__i386__) || defined(__x86_64__)
 866         char tmp;
 867         return !__get_user(tmp, (char __user *)ptr)
 868             && !__get_user(tmp, (char __user *)ptr + len - 1);
 869 #endif
 870         return 1;
 871 }
 872
 873 #ifdef ACPI_FUTURE_USAGE
 874 u8 acpi_os_writable(void *ptr, acpi_size len)
 875 {
 876         /* could do dummy write (racy) or a kernel page table lookup.
 877            The later may be difficult at early boot when kmap doesn't work yet. */
 878         return 1;
 879 }
 880 #endif
 881
 882 acpi_status acpi_os_signal(u32 function, void *info)
 883 {
 884         switch (function) {
 885         case ACPI_SIGNAL_FATAL:
 886                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 887                 break;
 888         case ACPI_SIGNAL_BREAKPOINT:
 889                 /*
 890                  * AML Breakpoint
 891                  * ACPI spec. says to treat it as a NOP unless
 892                  * you are debugging.  So if/when we integrate
 893                  * AML debugger into the kernel debugger its
 894                  * hook will go here.  But until then it is
 895                  * not useful to print anything on breakpoints.
 896                  */
 897                 break;
 898         default:
 899                 break;
 900         }
 901
 902         return AE_OK;
 903 }
 904
 905 EXPORT_SYMBOL(acpi_os_signal);
 906
 907 static int __init acpi_os_name_setup(char *str)
 908 {
 909         char *p = acpi_os_name;
 910         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 911
 912         if (!str || !*str)
 913                 return 0;
 914
 915         for (; count-- && str && *str; str++) {
 916                 if (isalnum(*str) || *str == ' ' || *str == ':')
 917                         *p++ = *str;
 918                 else if (*str == '\'' || *str == '"')
 919                         continue;
 920                 else
 921                         break;
 922         }
 923         *p = 0;
 924
 925         return 1;
 926
 927 }
 928
 929 __setup("acpi_os_name=", acpi_os_name_setup);
 930
 931 /*
 932  * _OSI control
 933  * empty string disables _OSI
 934  * TBD additional string adds to _OSI
 935  */
 936 static int __init acpi_osi_setup(char *str)
 937 {
 938         if (str == NULL || *str == '\0') {
 939                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 940                 acpi_gbl_create_osi_method = FALSE;
 941         } else {
 942                 /* TBD */
 943                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 944                        str);
 945         }
 946
 947         return 1;
 948 }
 949
 950 __setup("acpi_osi=", acpi_osi_setup);
 951
 952 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 953 static int __init acpi_serialize_setup(char *str)
 954 {
 955         printk(KERN_INFO PREFIX "serialize enabled\n");
 956
 957         acpi_gbl_all_methods_serialized = TRUE;
 958
 959         return 1;
 960 }
 961
 962 __setup("acpi_serialize", acpi_serialize_setup);
 963
 964 /*
 965  * Wake and Run-Time GPES are expected to be separate.
 966  * We disable wake-GPEs at run-time to prevent spurious
 967  * interrupts.
 968  *
 969  * However, if a system exists that shares Wake and
 970  * Run-time events on the same GPE this flag is available
 971  * to tell Linux to keep the wake-time GPEs enabled at run-time.
 972  */
 973 static int __init acpi_wake_gpes_always_on_setup(char *str)
 974 {
 975         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
 976
 977         acpi_gbl_leave_wake_gpes_disabled = FALSE;
 978
 979         return 1;
 980 }
 981
 982 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
 983
 984 static int __init acpi_hotkey_setup(char *str)
 985 {
 986         acpi_specific_hotkey_enabled = FALSE;
 987         return 1;
 988 }
 989
 990 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
 991
 992 /*
 993  * max_cstate is defined in the base kernel so modules can
 994  * change it w/o depending on the state of the processor module.
 995  */
 996 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
 997
 998 EXPORT_SYMBOL(max_cstate);
 999
1000 /*
1001  * Acquire a spinlock.
1002  *
1003  * handle is a pointer to the spinlock_t.
1004  */
1005
1006 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1007 {
1008         acpi_cpu_flags flags;
1009         spin_lock_irqsave(lockp, flags);
1010         return flags;
1011 }
1012
1013 /*
1014  * Release a spinlock. See above.
1015  */
1016
1017 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1018 {
1019         spin_unlock_irqrestore(lockp, flags);
1020 }
1021
1022 #ifndef ACPI_USE_LOCAL_CACHE
1023
1024 /*******************************************************************************
1025  *
1026  * FUNCTION:    acpi_os_create_cache
1027  *
1028  * PARAMETERS:  name      - Ascii name for the cache
1029  *              size      - Size of each cached object
1030  *              depth     - Maximum depth of the cache (in objects) <ignored>
1031  *              cache     - Where the new cache object is returned
1032  *
1033  * RETURN:      status
1034  *
1035  * DESCRIPTION: Create a cache object
1036  *
1037  ******************************************************************************/
1038
1039 acpi_status
1040 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1041 {
1042         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1043         if (cache == NULL)
1044                 return AE_ERROR;
1045         else
1046                 return AE_OK;
1047 }
1048
1049 /*******************************************************************************
1050  *
1051  * FUNCTION:    acpi_os_purge_cache
1052  *
1053  * PARAMETERS:  Cache           - Handle to cache object
1054  *
1055  * RETURN:      Status
1056  *
1057  * DESCRIPTION: Free all objects within the requested cache.
1058  *
1059  ******************************************************************************/
1060
1061 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1062 {
1063         (void)kmem_cache_shrink(cache);
1064         return (AE_OK);
1065 }
1066
1067 /*******************************************************************************
1068  *
1069  * FUNCTION:    acpi_os_delete_cache
1070  *
1071  * PARAMETERS:  Cache           - Handle to cache object
1072  *
1073  * RETURN:      Status
1074  *
1075  * DESCRIPTION: Free all objects within the requested cache and delete the
1076  *              cache object.
1077  *
1078  ******************************************************************************/
1079
1080 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1081 {
1082         kmem_cache_destroy(cache);
1083         return (AE_OK);
1084 }
1085
1086 /*******************************************************************************
1087  *
1088  * FUNCTION:    acpi_os_release_object
1089  *
1090  * PARAMETERS:  Cache       - Handle to cache object
1091  *              Object      - The object to be released
1092  *
1093  * RETURN:      None
1094  *
1095  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1096  *              the object is deleted.
1097  *
1098  ******************************************************************************/
1099
1100 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1101 {
1102         kmem_cache_free(cache, object);
1103         return (AE_OK);
1104 }
1105
1106 /******************************************************************************
1107  *
1108  * FUNCTION:    acpi_os_validate_interface
1109  *
1110  * PARAMETERS:  interface           - Requested interface to be validated
1111  *
1112  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1113  *
1114  * DESCRIPTION: Match an interface string to the interfaces supported by the
1115  *              host. Strings originate from an AML call to the _OSI method.
1116  *
1117  *****************************************************************************/
1118
1119 acpi_status
1120 acpi_os_validate_interface (char *interface)
1121 {
1122
1123     return AE_SUPPORT;
1124 }
1125
1126
1127 /******************************************************************************
1128  *
1129  * FUNCTION:    acpi_os_validate_address
1130  *
1131  * PARAMETERS:  space_id             - ACPI space ID
1132  *              address             - Physical address
1133  *              length              - Address length
1134  *
1135  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1136  *              should return AE_AML_ILLEGAL_ADDRESS.
1137  *
1138  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1139  *              the addresses accessed by AML operation regions.
1140  *
1141  *****************************************************************************/
1142
1143 acpi_status
1144 acpi_os_validate_address (
1145     u8                   space_id,
1146     acpi_physical_address   address,
1147     acpi_size               length)
1148 {
1149
1150     return AE_OK;
1151 }
1152
1153
1154 #endif