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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/interrupt.h>
  34 #include <linux/kmod.h>
  35 #include <linux/delay.h>
  36 #include <linux/dmi.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/nmi.h>
  39 #include <linux/acpi.h>
  40 #include <acpi/acpi.h>
  41 #include <asm/io.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/processor.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <linux/efi.h>
  47
  48 #define _COMPONENT              ACPI_OS_SERVICES
  49 ACPI_MODULE_NAME("osl");
  50 #define PREFIX          "ACPI: "
  51 struct acpi_os_dpc {
  52         acpi_osd_exec_callback function;
  53         void *context;
  54         struct work_struct work;
  55 };
  56
  57 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  58 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  59 #endif
  60
  61 #ifdef ENABLE_DEBUGGER
  62 #include <linux/kdb.h>
  63
  64 /* stuff for debugger support */
  65 int acpi_in_debugger;
  66 EXPORT_SYMBOL(acpi_in_debugger);
  67
  68 extern char line_buf[80];
  69 #endif                          /*ENABLE_DEBUGGER */
  70
  71 static unsigned int acpi_irq_irq;
  72 static acpi_osd_handler acpi_irq_handler;
  73 static void *acpi_irq_context;
  74 static struct workqueue_struct *kacpid_wq;
  75 static struct workqueue_struct *kacpi_notify_wq;
  76
  77 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  78 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  79
  80 static int osi_linux;           /* disable _OSI(Linux) by default */
  81
  82 #ifdef CONFIG_DMI
  83 static struct __initdata dmi_system_id acpi_osl_dmi_table[];
  84 #endif
  85
  86 static void __init acpi_request_region (struct acpi_generic_address *addr,
  87         unsigned int length, char *desc)
  88 {
  89         struct resource *res;
  90
  91         if (!addr->address || !length)
  92                 return;
  93
  94         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  95                 res = request_region(addr->address, length, desc);
  96         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  97                 res = request_mem_region(addr->address, length, desc);
  98 }
  99
 100 static int __init acpi_reserve_resources(void)
 101 {
 102         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 103                 "ACPI PM1a_EVT_BLK");
 104
 105         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 106                 "ACPI PM1b_EVT_BLK");
 107
 108         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 109                 "ACPI PM1a_CNT_BLK");
 110
 111         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 112                 "ACPI PM1b_CNT_BLK");
 113
 114         if (acpi_gbl_FADT.pm_timer_length == 4)
 115                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 116
 117         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 118                 "ACPI PM2_CNT_BLK");
 119
 120         /* Length of GPE blocks must be a non-negative multiple of 2 */
 121
 122         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 123                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 124                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 125
 126         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 127                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 128                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 129
 130         return 0;
 131 }
 132 device_initcall(acpi_reserve_resources);
 133
 134 acpi_status __init acpi_os_initialize(void)
 135 {
 136         dmi_check_system(acpi_osl_dmi_table);
 137         return AE_OK;
 138 }
 139
 140 acpi_status acpi_os_initialize1(void)
 141 {
 142         /*
 143          * Initialize PCI configuration space access, as we'll need to access
 144          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 145          */
 146         if (!raw_pci_ops) {
 147                 printk(KERN_ERR PREFIX
 148                        "Access to PCI configuration space unavailable\n");
 149                 return AE_NULL_ENTRY;
 150         }
 151         kacpid_wq = create_singlethread_workqueue("kacpid");
 152         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 153         BUG_ON(!kacpid_wq);
 154         BUG_ON(!kacpi_notify_wq);
 155         return AE_OK;
 156 }
 157
 158 acpi_status acpi_os_terminate(void)
 159 {
 160         if (acpi_irq_handler) {
 161                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 162                                                  acpi_irq_handler);
 163         }
 164
 165         destroy_workqueue(kacpid_wq);
 166         destroy_workqueue(kacpi_notify_wq);
 167
 168         return AE_OK;
 169 }
 170
 171 void acpi_os_printf(const char *fmt, ...)
 172 {
 173         va_list args;
 174         va_start(args, fmt);
 175         acpi_os_vprintf(fmt, args);
 176         va_end(args);
 177 }
 178
 179 EXPORT_SYMBOL(acpi_os_printf);
 180
 181 void acpi_os_vprintf(const char *fmt, va_list args)
 182 {
 183         static char buffer[512];
 184
 185         vsprintf(buffer, fmt, args);
 186
 187 #ifdef ENABLE_DEBUGGER
 188         if (acpi_in_debugger) {
 189                 kdb_printf("%s", buffer);
 190         } else {
 191                 printk("%s", buffer);
 192         }
 193 #else
 194         printk("%s", buffer);
 195 #endif
 196 }
 197
 198 acpi_physical_address __init acpi_os_get_root_pointer(void)
 199 {
 200         if (efi_enabled) {
 201                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 202                         return efi.acpi20;
 203                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 204                         return efi.acpi;
 205                 else {
 206                         printk(KERN_ERR PREFIX
 207                                "System description tables not found\n");
 208                         return 0;
 209                 }
 210         } else
 211                 return acpi_find_rsdp();
 212 }
 213
 214 void __iomem *__init_refok
 215 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 216 {
 217         if (phys > ULONG_MAX) {
 218                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 219                 return NULL;
 220         }
 221         if (acpi_gbl_permanent_mmap)
 222                 /*
 223                 * ioremap checks to ensure this is in reserved space
 224                 */
 225                 return ioremap((unsigned long)phys, size);
 226         else
 227                 return __acpi_map_table((unsigned long)phys, size);
 228 }
 229 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 230
 231 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 232 {
 233         if (acpi_gbl_permanent_mmap) {
 234                 iounmap(virt);
 235         }
 236 }
 237 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 238
 239 #ifdef ACPI_FUTURE_USAGE
 240 acpi_status
 241 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 242 {
 243         if (!phys || !virt)
 244                 return AE_BAD_PARAMETER;
 245
 246         *phys = virt_to_phys(virt);
 247
 248         return AE_OK;
 249 }
 250 #endif
 251
 252 #define ACPI_MAX_OVERRIDE_LEN 100
 253
 254 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 255
 256 acpi_status
 257 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 258                             acpi_string * new_val)
 259 {
 260         if (!init_val || !new_val)
 261                 return AE_BAD_PARAMETER;
 262
 263         *new_val = NULL;
 264         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 265                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 266                        acpi_os_name);
 267                 *new_val = acpi_os_name;
 268         }
 269
 270         return AE_OK;
 271 }
 272
 273 acpi_status
 274 acpi_os_table_override(struct acpi_table_header * existing_table,
 275                        struct acpi_table_header ** new_table)
 276 {
 277         if (!existing_table || !new_table)
 278                 return AE_BAD_PARAMETER;
 279
 280 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 281         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 282                 *new_table = (struct acpi_table_header *)AmlCode;
 283         else
 284                 *new_table = NULL;
 285 #else
 286         *new_table = NULL;
 287 #endif
 288         return AE_OK;
 289 }
 290
 291 static irqreturn_t acpi_irq(int irq, void *dev_id)
 292 {
 293         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 294 }
 295
 296 acpi_status
 297 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 298                                   void *context)
 299 {
 300         unsigned int irq;
 301
 302         /*
 303          * Ignore the GSI from the core, and use the value in our copy of the
 304          * FADT. It may not be the same if an interrupt source override exists
 305          * for the SCI.
 306          */
 307         gsi = acpi_gbl_FADT.sci_interrupt;
 308         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 309                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 310                        gsi);
 311                 return AE_OK;
 312         }
 313
 314         acpi_irq_handler = handler;
 315         acpi_irq_context = context;
 316         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 317                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 318                 return AE_NOT_ACQUIRED;
 319         }
 320         acpi_irq_irq = irq;
 321
 322         return AE_OK;
 323 }
 324
 325 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 326 {
 327         if (irq) {
 328                 free_irq(irq, acpi_irq);
 329                 acpi_irq_handler = NULL;
 330                 acpi_irq_irq = 0;
 331         }
 332
 333         return AE_OK;
 334 }
 335
 336 /*
 337  * Running in interpreter thread context, safe to sleep
 338  */
 339
 340 void acpi_os_sleep(acpi_integer ms)
 341 {
 342         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 343 }
 344
 345 EXPORT_SYMBOL(acpi_os_sleep);
 346
 347 void acpi_os_stall(u32 us)
 348 {
 349         while (us) {
 350                 u32 delay = 1000;
 351
 352                 if (delay > us)
 353                         delay = us;
 354                 udelay(delay);
 355                 touch_nmi_watchdog();
 356                 us -= delay;
 357         }
 358 }
 359
 360 EXPORT_SYMBOL(acpi_os_stall);
 361
 362 /*
 363  * Support ACPI 3.0 AML Timer operand
 364  * Returns 64-bit free-running, monotonically increasing timer
 365  * with 100ns granularity
 366  */
 367 u64 acpi_os_get_timer(void)
 368 {
 369         static u64 t;
 370
 371 #ifdef  CONFIG_HPET
 372         /* TBD: use HPET if available */
 373 #endif
 374
 375 #ifdef  CONFIG_X86_PM_TIMER
 376         /* TBD: default to PM timer if HPET was not available */
 377 #endif
 378         if (!t)
 379                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 380
 381         return ++t;
 382 }
 383
 384 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 385 {
 386         u32 dummy;
 387
 388         if (!value)
 389                 value = &dummy;
 390
 391         *value = 0;
 392         if (width <= 8) {
 393                 *(u8 *) value = inb(port);
 394         } else if (width <= 16) {
 395                 *(u16 *) value = inw(port);
 396         } else if (width <= 32) {
 397                 *(u32 *) value = inl(port);
 398         } else {
 399                 BUG();
 400         }
 401
 402         return AE_OK;
 403 }
 404
 405 EXPORT_SYMBOL(acpi_os_read_port);
 406
 407 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 408 {
 409         if (width <= 8) {
 410                 outb(value, port);
 411         } else if (width <= 16) {
 412                 outw(value, port);
 413         } else if (width <= 32) {
 414                 outl(value, port);
 415         } else {
 416                 BUG();
 417         }
 418
 419         return AE_OK;
 420 }
 421
 422 EXPORT_SYMBOL(acpi_os_write_port);
 423
 424 acpi_status
 425 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 426 {
 427         u32 dummy;
 428         void __iomem *virt_addr;
 429
 430         virt_addr = ioremap(phys_addr, width);
 431         if (!value)
 432                 value = &dummy;
 433
 434         switch (width) {
 435         case 8:
 436                 *(u8 *) value = readb(virt_addr);
 437                 break;
 438         case 16:
 439                 *(u16 *) value = readw(virt_addr);
 440                 break;
 441         case 32:
 442                 *(u32 *) value = readl(virt_addr);
 443                 break;
 444         default:
 445                 BUG();
 446         }
 447
 448         iounmap(virt_addr);
 449
 450         return AE_OK;
 451 }
 452
 453 acpi_status
 454 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 455 {
 456         void __iomem *virt_addr;
 457
 458         virt_addr = ioremap(phys_addr, width);
 459
 460         switch (width) {
 461         case 8:
 462                 writeb(value, virt_addr);
 463                 break;
 464         case 16:
 465                 writew(value, virt_addr);
 466                 break;
 467         case 32:
 468                 writel(value, virt_addr);
 469                 break;
 470         default:
 471                 BUG();
 472         }
 473
 474         iounmap(virt_addr);
 475
 476         return AE_OK;
 477 }
 478
 479 acpi_status
 480 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 481                                void *value, u32 width)
 482 {
 483         int result, size;
 484
 485         if (!value)
 486                 return AE_BAD_PARAMETER;
 487
 488         switch (width) {
 489         case 8:
 490                 size = 1;
 491                 break;
 492         case 16:
 493                 size = 2;
 494                 break;
 495         case 32:
 496                 size = 4;
 497                 break;
 498         default:
 499                 return AE_ERROR;
 500         }
 501
 502         BUG_ON(!raw_pci_ops);
 503
 504         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 505                                    PCI_DEVFN(pci_id->device, pci_id->function),
 506                                    reg, size, value);
 507
 508         return (result ? AE_ERROR : AE_OK);
 509 }
 510
 511 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 512
 513 acpi_status
 514 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 515                                 acpi_integer value, u32 width)
 516 {
 517         int result, size;
 518
 519         switch (width) {
 520         case 8:
 521                 size = 1;
 522                 break;
 523         case 16:
 524                 size = 2;
 525                 break;
 526         case 32:
 527                 size = 4;
 528                 break;
 529         default:
 530                 return AE_ERROR;
 531         }
 532
 533         BUG_ON(!raw_pci_ops);
 534
 535         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 536                                     PCI_DEVFN(pci_id->device, pci_id->function),
 537                                     reg, size, value);
 538
 539         return (result ? AE_ERROR : AE_OK);
 540 }
 541
 542 /* TODO: Change code to take advantage of driver model more */
 543 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 544                                     acpi_handle chandle,        /* current node */
 545                                     struct acpi_pci_id **id,
 546                                     int *is_bridge, u8 * bus_number)
 547 {
 548         acpi_handle handle;
 549         struct acpi_pci_id *pci_id = *id;
 550         acpi_status status;
 551         unsigned long temp;
 552         acpi_object_type type;
 553         u8 tu8;
 554
 555         acpi_get_parent(chandle, &handle);
 556         if (handle != rhandle) {
 557                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 558                                         bus_number);
 559
 560                 status = acpi_get_type(handle, &type);
 561                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 562                         return;
 563
 564                 status =
 565                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 566                                           &temp);
 567                 if (ACPI_SUCCESS(status)) {
 568                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 569                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 570
 571                         if (*is_bridge)
 572                                 pci_id->bus = *bus_number;
 573
 574                         /* any nicer way to get bus number of bridge ? */
 575                         status =
 576                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 577                                                            8);
 578                         if (ACPI_SUCCESS(status)
 579                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 580                                 status =
 581                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 582                                                                    &tu8, 8);
 583                                 if (!ACPI_SUCCESS(status)) {
 584                                         /* Certainly broken...  FIX ME */
 585                                         return;
 586                                 }
 587                                 *is_bridge = 1;
 588                                 pci_id->bus = tu8;
 589                                 status =
 590                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 591                                                                    &tu8, 8);
 592                                 if (ACPI_SUCCESS(status)) {
 593                                         *bus_number = tu8;
 594                                 }
 595                         } else
 596                                 *is_bridge = 0;
 597                 }
 598         }
 599 }
 600
 601 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 602                            acpi_handle chandle, /* current node */
 603                            struct acpi_pci_id **id)
 604 {
 605         int is_bridge = 1;
 606         u8 bus_number = (*id)->bus;
 607
 608         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 609 }
 610
 611 static void acpi_os_execute_deferred(struct work_struct *work)
 612 {
 613         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 614         if (!dpc) {
 615                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 616                 return;
 617         }
 618
 619         dpc->function(dpc->context);
 620         kfree(dpc);
 621
 622         /* Yield cpu to notify thread */
 623         cond_resched();
 624
 625         return;
 626 }
 627
 628 static void acpi_os_execute_notify(struct work_struct *work)
 629 {
 630         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 631
 632         if (!dpc) {
 633                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 634                 return;
 635         }
 636
 637         dpc->function(dpc->context);
 638
 639         kfree(dpc);
 640
 641         return;
 642 }
 643
 644 /*******************************************************************************
 645  *
 646  * FUNCTION:    acpi_os_execute
 647  *
 648  * PARAMETERS:  Type               - Type of the callback
 649  *              Function           - Function to be executed
 650  *              Context            - Function parameters
 651  *
 652  * RETURN:      Status
 653  *
 654  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 655  *              immediately executes function on a separate thread.
 656  *
 657  ******************************************************************************/
 658
 659 acpi_status acpi_os_execute(acpi_execute_type type,
 660                             acpi_osd_exec_callback function, void *context)
 661 {
 662         acpi_status status = AE_OK;
 663         struct acpi_os_dpc *dpc;
 664
 665         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 666                           "Scheduling function [%p(%p)] for deferred execution.\n",
 667                           function, context));
 668
 669         if (!function)
 670                 return AE_BAD_PARAMETER;
 671
 672         /*
 673          * Allocate/initialize DPC structure.  Note that this memory will be
 674          * freed by the callee.  The kernel handles the work_struct list  in a
 675          * way that allows us to also free its memory inside the callee.
 676          * Because we may want to schedule several tasks with different
 677          * parameters we can't use the approach some kernel code uses of
 678          * having a static work_struct.
 679          */
 680
 681         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 682         if (!dpc)
 683                 return_ACPI_STATUS(AE_NO_MEMORY);
 684
 685         dpc->function = function;
 686         dpc->context = context;
 687
 688         if (type == OSL_NOTIFY_HANDLER) {
 689                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 690                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 691                         status = AE_ERROR;
 692                         kfree(dpc);
 693                 }
 694         } else {
 695                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 696                 if (!queue_work(kacpid_wq, &dpc->work)) {
 697                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 698                                   "Call to queue_work() failed.\n"));
 699                         status = AE_ERROR;
 700                         kfree(dpc);
 701                 }
 702         }
 703         return_ACPI_STATUS(status);
 704 }
 705
 706 EXPORT_SYMBOL(acpi_os_execute);
 707
 708 void acpi_os_wait_events_complete(void *context)
 709 {
 710         flush_workqueue(kacpid_wq);
 711 }
 712
 713 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 714
 715 /*
 716  * Allocate the memory for a spinlock and initialize it.
 717  */
 718 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 719 {
 720         spin_lock_init(*handle);
 721
 722         return AE_OK;
 723 }
 724
 725 /*
 726  * Deallocate the memory for a spinlock.
 727  */
 728 void acpi_os_delete_lock(acpi_spinlock handle)
 729 {
 730         return;
 731 }
 732
 733 acpi_status
 734 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 735 {
 736         struct semaphore *sem = NULL;
 737
 738
 739         sem = acpi_os_allocate(sizeof(struct semaphore));
 740         if (!sem)
 741                 return AE_NO_MEMORY;
 742         memset(sem, 0, sizeof(struct semaphore));
 743
 744         sema_init(sem, initial_units);
 745
 746         *handle = (acpi_handle *) sem;
 747
 748         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 749                           *handle, initial_units));
 750
 751         return AE_OK;
 752 }
 753
 754 EXPORT_SYMBOL(acpi_os_create_semaphore);
 755
 756 /*
 757  * TODO: A better way to delete semaphores?  Linux doesn't have a
 758  * 'delete_semaphore()' function -- may result in an invalid
 759  * pointer dereference for non-synchronized consumers.  Should
 760  * we at least check for blocked threads and signal/cancel them?
 761  */
 762
 763 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 764 {
 765         struct semaphore *sem = (struct semaphore *)handle;
 766
 767
 768         if (!sem)
 769                 return AE_BAD_PARAMETER;
 770
 771         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 772
 773         kfree(sem);
 774         sem = NULL;
 775
 776         return AE_OK;
 777 }
 778
 779 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 780
 781 /*
 782  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 783  * improvise.  The process is to sleep for one scheduler quantum
 784  * until the semaphore becomes available.  Downside is that this
 785  * may result in starvation for timeout-based waits when there's
 786  * lots of semaphore activity.
 787  *
 788  * TODO: Support for units > 1?
 789  */
 790 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 791 {
 792         acpi_status status = AE_OK;
 793         struct semaphore *sem = (struct semaphore *)handle;
 794         int ret = 0;
 795
 796
 797         if (!sem || (units < 1))
 798                 return AE_BAD_PARAMETER;
 799
 800         if (units > 1)
 801                 return AE_SUPPORT;
 802
 803         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 804                           handle, units, timeout));
 805
 806         /*
 807          * This can be called during resume with interrupts off.
 808          * Like boot-time, we should be single threaded and will
 809          * always get the lock if we try -- timeout or not.
 810          * If this doesn't succeed, then we will oops courtesy of
 811          * might_sleep() in down().
 812          */
 813         if (!down_trylock(sem))
 814                 return AE_OK;
 815
 816         switch (timeout) {
 817                 /*
 818                  * No Wait:
 819                  * --------
 820                  * A zero timeout value indicates that we shouldn't wait - just
 821                  * acquire the semaphore if available otherwise return AE_TIME
 822                  * (a.k.a. 'would block').
 823                  */
 824         case 0:
 825                 if (down_trylock(sem))
 826                         status = AE_TIME;
 827                 break;
 828
 829                 /*
 830                  * Wait Indefinitely:
 831                  * ------------------
 832                  */
 833         case ACPI_WAIT_FOREVER:
 834                 down(sem);
 835                 break;
 836
 837                 /*
 838                  * Wait w/ Timeout:
 839                  * ----------------
 840                  */
 841         default:
 842                 // TODO: A better timeout algorithm?
 843                 {
 844                         int i = 0;
 845                         static const int quantum_ms = 1000 / HZ;
 846
 847                         ret = down_trylock(sem);
 848                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 849                                 schedule_timeout_interruptible(1);
 850                                 ret = down_trylock(sem);
 851                         }
 852
 853                         if (ret != 0)
 854                                 status = AE_TIME;
 855                 }
 856                 break;
 857         }
 858
 859         if (ACPI_FAILURE(status)) {
 860                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 861                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 862                                   handle, units, timeout,
 863                                   acpi_format_exception(status)));
 864         } else {
 865                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 866                                   "Acquired semaphore[%p|%d|%d]", handle,
 867                                   units, timeout));
 868         }
 869
 870         return status;
 871 }
 872
 873 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 874
 875 /*
 876  * TODO: Support for units > 1?
 877  */
 878 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 879 {
 880         struct semaphore *sem = (struct semaphore *)handle;
 881
 882
 883         if (!sem || (units < 1))
 884                 return AE_BAD_PARAMETER;
 885
 886         if (units > 1)
 887                 return AE_SUPPORT;
 888
 889         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 890                           units));
 891
 892         up(sem);
 893
 894         return AE_OK;
 895 }
 896
 897 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 898
 899 #ifdef ACPI_FUTURE_USAGE
 900 u32 acpi_os_get_line(char *buffer)
 901 {
 902
 903 #ifdef ENABLE_DEBUGGER
 904         if (acpi_in_debugger) {
 905                 u32 chars;
 906
 907                 kdb_read(buffer, sizeof(line_buf));
 908
 909                 /* remove the CR kdb includes */
 910                 chars = strlen(buffer) - 1;
 911                 buffer[chars] = '\0';
 912         }
 913 #endif
 914
 915         return 0;
 916 }
 917 #endif                          /*  ACPI_FUTURE_USAGE  */
 918
 919 acpi_status acpi_os_signal(u32 function, void *info)
 920 {
 921         switch (function) {
 922         case ACPI_SIGNAL_FATAL:
 923                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 924                 break;
 925         case ACPI_SIGNAL_BREAKPOINT:
 926                 /*
 927                  * AML Breakpoint
 928                  * ACPI spec. says to treat it as a NOP unless
 929                  * you are debugging.  So if/when we integrate
 930                  * AML debugger into the kernel debugger its
 931                  * hook will go here.  But until then it is
 932                  * not useful to print anything on breakpoints.
 933                  */
 934                 break;
 935         default:
 936                 break;
 937         }
 938
 939         return AE_OK;
 940 }
 941
 942 EXPORT_SYMBOL(acpi_os_signal);
 943
 944 static int __init acpi_os_name_setup(char *str)
 945 {
 946         char *p = acpi_os_name;
 947         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 948
 949         if (!str || !*str)
 950                 return 0;
 951
 952         for (; count-- && str && *str; str++) {
 953                 if (isalnum(*str) || *str == ' ' || *str == ':')
 954                         *p++ = *str;
 955                 else if (*str == '\'' || *str == '"')
 956                         continue;
 957                 else
 958                         break;
 959         }
 960         *p = 0;
 961
 962         return 1;
 963
 964 }
 965
 966 __setup("acpi_os_name=", acpi_os_name_setup);
 967
 968 static void enable_osi_linux(int enable) {
 969
 970         if (osi_linux != enable)
 971                 printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",
 972                         enable ? "En": "Dis");
 973
 974         osi_linux = enable;
 975         return;
 976 }
 977
 978 /*
 979  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 980  *
 981  * empty string disables _OSI
 982  * string starting with '!' disables that string
 983  * otherwise string is added to list, augmenting built-in strings
 984  */
 985 static int __init acpi_osi_setup(char *str)
 986 {
 987         if (str == NULL || *str == '\0') {
 988                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 989                 acpi_gbl_create_osi_method = FALSE;
 990         } else if (!strcmp("!Linux", str)) {
 991                 enable_osi_linux(0);
 992         } else if (*str == '!') {
 993                 if (acpi_osi_invalidate(++str) == AE_OK)
 994                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
 995         } else if (!strcmp("Linux", str)) {
 996                 enable_osi_linux(1);
 997         } else if (*osi_additional_string == '\0') {
 998                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
 999                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1000         }
1001
1002         return 1;
1003 }
1004
1005 __setup("acpi_osi=", acpi_osi_setup);
1006
1007 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1008 static int __init acpi_serialize_setup(char *str)
1009 {
1010         printk(KERN_INFO PREFIX "serialize enabled\n");
1011
1012         acpi_gbl_all_methods_serialized = TRUE;
1013
1014         return 1;
1015 }
1016
1017 __setup("acpi_serialize", acpi_serialize_setup);
1018
1019 /*
1020  * Wake and Run-Time GPES are expected to be separate.
1021  * We disable wake-GPEs at run-time to prevent spurious
1022  * interrupts.
1023  *
1024  * However, if a system exists that shares Wake and
1025  * Run-time events on the same GPE this flag is available
1026  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1027  */
1028 static int __init acpi_wake_gpes_always_on_setup(char *str)
1029 {
1030         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1031
1032         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1033
1034         return 1;
1035 }
1036
1037 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1038
1039 /*
1040  * Acquire a spinlock.
1041  *
1042  * handle is a pointer to the spinlock_t.
1043  */
1044
1045 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1046 {
1047         acpi_cpu_flags flags;
1048         spin_lock_irqsave(lockp, flags);
1049         return flags;
1050 }
1051
1052 /*
1053  * Release a spinlock. See above.
1054  */
1055
1056 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1057 {
1058         spin_unlock_irqrestore(lockp, flags);
1059 }
1060
1061 #ifndef ACPI_USE_LOCAL_CACHE
1062
1063 /*******************************************************************************
1064  *
1065  * FUNCTION:    acpi_os_create_cache
1066  *
1067  * PARAMETERS:  name      - Ascii name for the cache
1068  *              size      - Size of each cached object
1069  *              depth     - Maximum depth of the cache (in objects) <ignored>
1070  *              cache     - Where the new cache object is returned
1071  *
1072  * RETURN:      status
1073  *
1074  * DESCRIPTION: Create a cache object
1075  *
1076  ******************************************************************************/
1077
1078 acpi_status
1079 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1080 {
1081         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1082         if (*cache == NULL)
1083                 return AE_ERROR;
1084         else
1085                 return AE_OK;
1086 }
1087
1088 /*******************************************************************************
1089  *
1090  * FUNCTION:    acpi_os_purge_cache
1091  *
1092  * PARAMETERS:  Cache           - Handle to cache object
1093  *
1094  * RETURN:      Status
1095  *
1096  * DESCRIPTION: Free all objects within the requested cache.
1097  *
1098  ******************************************************************************/
1099
1100 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1101 {
1102         kmem_cache_shrink(cache);
1103         return (AE_OK);
1104 }
1105
1106 /*******************************************************************************
1107  *
1108  * FUNCTION:    acpi_os_delete_cache
1109  *
1110  * PARAMETERS:  Cache           - Handle to cache object
1111  *
1112  * RETURN:      Status
1113  *
1114  * DESCRIPTION: Free all objects within the requested cache and delete the
1115  *              cache object.
1116  *
1117  ******************************************************************************/
1118
1119 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1120 {
1121         kmem_cache_destroy(cache);
1122         return (AE_OK);
1123 }
1124
1125 /*******************************************************************************
1126  *
1127  * FUNCTION:    acpi_os_release_object
1128  *
1129  * PARAMETERS:  Cache       - Handle to cache object
1130  *              Object      - The object to be released
1131  *
1132  * RETURN:      None
1133  *
1134  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1135  *              the object is deleted.
1136  *
1137  ******************************************************************************/
1138
1139 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1140 {
1141         kmem_cache_free(cache, object);
1142         return (AE_OK);
1143 }
1144
1145 /******************************************************************************
1146  *
1147  * FUNCTION:    acpi_os_validate_interface
1148  *
1149  * PARAMETERS:  interface           - Requested interface to be validated
1150  *
1151  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1152  *
1153  * DESCRIPTION: Match an interface string to the interfaces supported by the
1154  *              host. Strings originate from an AML call to the _OSI method.
1155  *
1156  *****************************************************************************/
1157
1158 acpi_status
1159 acpi_os_validate_interface (char *interface)
1160 {
1161         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1162                 return AE_OK;
1163         if (!strcmp("Linux", interface)) {
1164                 printk(KERN_WARNING PREFIX
1165                         "System BIOS is requesting _OSI(Linux)\n");
1166                 printk(KERN_WARNING PREFIX
1167                         "If \"acpi_osi=Linux\" works better,\n"
1168                         "Please send dmidecode "
1169                         "to linux-acpi@vger.kernel.org\n");
1170                 if(osi_linux)
1171                         return AE_OK;
1172         }
1173         return AE_SUPPORT;
1174 }
1175
1176 /******************************************************************************
1177  *
1178  * FUNCTION:    acpi_os_validate_address
1179  *
1180  * PARAMETERS:  space_id             - ACPI space ID
1181  *              address             - Physical address
1182  *              length              - Address length
1183  *
1184  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1185  *              should return AE_AML_ILLEGAL_ADDRESS.
1186  *
1187  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1188  *              the addresses accessed by AML operation regions.
1189  *
1190  *****************************************************************************/
1191
1192 acpi_status
1193 acpi_os_validate_address (
1194     u8                   space_id,
1195     acpi_physical_address   address,
1196     acpi_size               length)
1197 {
1198
1199     return AE_OK;
1200 }
1201
1202 #ifdef CONFIG_DMI
1203 static int dmi_osi_linux(const struct dmi_system_id *d)
1204 {
1205         printk(KERN_NOTICE "%s detected: enabling _OSI(Linux)\n", d->ident);
1206         enable_osi_linux(1);
1207         return 0;
1208 }
1209
1210 static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {
1211         /*
1212          * Boxes that need _OSI(Linux)
1213          */
1214         {
1215          .callback = dmi_osi_linux,
1216          .ident = "Intel Napa CRB",
1217          .matches = {
1218                      DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
1219                      DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),
1220                      },
1221          },
1222         {}
1223 };
1224 #endif /* CONFIG_DMI */
1225
1226 #endif