drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/mm.h>
  32 #include <linux/pci.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/kmod.h>
  35 #include <linux/delay.h>
  36 #include <linux/dmi.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/nmi.h>
  39 #include <linux/acpi.h>
  40 #include <acpi/acpi.h>
  41 #include <asm/io.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/processor.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <linux/efi.h>
  47
  48 #define _COMPONENT              ACPI_OS_SERVICES
  49 ACPI_MODULE_NAME("osl");
  50 #define PREFIX          "ACPI: "
  51 struct acpi_os_dpc {
  52         acpi_osd_exec_callback function;
  53         void *context;
  54         struct work_struct work;
  55 };
  56
  57 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  58 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  59 #endif
  60
  61 #ifdef ENABLE_DEBUGGER
  62 #include <linux/kdb.h>
  63
  64 /* stuff for debugger support */
  65 int acpi_in_debugger;
  66 EXPORT_SYMBOL(acpi_in_debugger);
  67
  68 extern char line_buf[80];
  69 #endif                          /*ENABLE_DEBUGGER */
  70
  71 static unsigned int acpi_irq_irq;
  72 static acpi_osd_handler acpi_irq_handler;
  73 static void *acpi_irq_context;
  74 static struct workqueue_struct *kacpid_wq;
  75 static struct workqueue_struct *kacpi_notify_wq;
  76
  77 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  78 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  79
  80 static int osi_linux;           /* disable _OSI(Linux) by default */
  81
  82 #ifdef CONFIG_DMI
  83 static struct __initdata dmi_system_id acpi_osl_dmi_table[];
  84 #endif
  85
  86 static void __init acpi_request_region (struct acpi_generic_address *addr,
  87         unsigned int length, char *desc)
  88 {
  89         struct resource *res;
  90
  91         if (!addr->address || !length)
  92                 return;
  93
  94         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  95                 res = request_region(addr->address, length, desc);
  96         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  97                 res = request_mem_region(addr->address, length, desc);
  98 }
  99
 100 static int __init acpi_reserve_resources(void)
 101 {
 102         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 103                 "ACPI PM1a_EVT_BLK");
 104
 105         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 106                 "ACPI PM1b_EVT_BLK");
 107
 108         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 109                 "ACPI PM1a_CNT_BLK");
 110
 111         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 112                 "ACPI PM1b_CNT_BLK");
 113
 114         if (acpi_gbl_FADT.pm_timer_length == 4)
 115                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 116
 117         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 118                 "ACPI PM2_CNT_BLK");
 119
 120         /* Length of GPE blocks must be a non-negative multiple of 2 */
 121
 122         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 123                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 124                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 125
 126         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 127                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 128                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 129
 130         return 0;
 131 }
 132 device_initcall(acpi_reserve_resources);
 133
 134 acpi_status __init acpi_os_initialize(void)
 135 {
 136         dmi_check_system(acpi_osl_dmi_table);
 137         return AE_OK;
 138 }
 139
 140 acpi_status acpi_os_initialize1(void)
 141 {
 142         /*
 143          * Initialize PCI configuration space access, as we'll need to access
 144          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 145          */
 146         if (!raw_pci_ops) {
 147                 printk(KERN_ERR PREFIX
 148                        "Access to PCI configuration space unavailable\n");
 149                 return AE_NULL_ENTRY;
 150         }
 151         kacpid_wq = create_singlethread_workqueue("kacpid");
 152         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 153         BUG_ON(!kacpid_wq);
 154         BUG_ON(!kacpi_notify_wq);
 155         return AE_OK;
 156 }
 157
 158 acpi_status acpi_os_terminate(void)
 159 {
 160         if (acpi_irq_handler) {
 161                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 162                                                  acpi_irq_handler);
 163         }
 164
 165         destroy_workqueue(kacpid_wq);
 166         destroy_workqueue(kacpi_notify_wq);
 167
 168         return AE_OK;
 169 }
 170
 171 void acpi_os_printf(const char *fmt, ...)
 172 {
 173         va_list args;
 174         va_start(args, fmt);
 175         acpi_os_vprintf(fmt, args);
 176         va_end(args);
 177 }
 178
 179 EXPORT_SYMBOL(acpi_os_printf);
 180
 181 void acpi_os_vprintf(const char *fmt, va_list args)
 182 {
 183         static char buffer[512];
 184
 185         vsprintf(buffer, fmt, args);
 186
 187 #ifdef ENABLE_DEBUGGER
 188         if (acpi_in_debugger) {
 189                 kdb_printf("%s", buffer);
 190         } else {
 191                 printk("%s", buffer);
 192         }
 193 #else
 194         printk("%s", buffer);
 195 #endif
 196 }
 197
 198 acpi_physical_address __init acpi_os_get_root_pointer(void)
 199 {
 200         if (efi_enabled) {
 201                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 202                         return efi.acpi20;
 203                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 204                         return efi.acpi;
 205                 else {
 206                         printk(KERN_ERR PREFIX
 207                                "System description tables not found\n");
 208                         return 0;
 209                 }
 210         } else {
 211                 acpi_physical_address pa = 0;
 212
 213                 acpi_find_root_pointer(&pa);
 214                 return pa;
 215         }
 216 }
 217
 218 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 219 {
 220         if (phys > ULONG_MAX) {
 221                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 222                 return NULL;
 223         }
 224         if (acpi_gbl_permanent_mmap)
 225                 /*
 226                 * ioremap checks to ensure this is in reserved space
 227                 */
 228                 return ioremap((unsigned long)phys, size);
 229         else
 230                 return __acpi_map_table((unsigned long)phys, size);
 231 }
 232 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 233
 234 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 235 {
 236         if (acpi_gbl_permanent_mmap) {
 237                 iounmap(virt);
 238         }
 239 }
 240 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 241
 242 #ifdef ACPI_FUTURE_USAGE
 243 acpi_status
 244 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 245 {
 246         if (!phys || !virt)
 247                 return AE_BAD_PARAMETER;
 248
 249         *phys = virt_to_phys(virt);
 250
 251         return AE_OK;
 252 }
 253 #endif
 254
 255 #define ACPI_MAX_OVERRIDE_LEN 100
 256
 257 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 258
 259 acpi_status
 260 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 261                             acpi_string * new_val)
 262 {
 263         if (!init_val || !new_val)
 264                 return AE_BAD_PARAMETER;
 265
 266         *new_val = NULL;
 267         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 268                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 269                        acpi_os_name);
 270                 *new_val = acpi_os_name;
 271         }
 272
 273         return AE_OK;
 274 }
 275
 276 acpi_status
 277 acpi_os_table_override(struct acpi_table_header * existing_table,
 278                        struct acpi_table_header ** new_table)
 279 {
 280         if (!existing_table || !new_table)
 281                 return AE_BAD_PARAMETER;
 282
 283 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 284         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 285                 *new_table = (struct acpi_table_header *)AmlCode;
 286         else
 287                 *new_table = NULL;
 288 #else
 289         *new_table = NULL;
 290 #endif
 291         return AE_OK;
 292 }
 293
 294 static irqreturn_t acpi_irq(int irq, void *dev_id)
 295 {
 296         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 297 }
 298
 299 acpi_status
 300 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 301                                   void *context)
 302 {
 303         unsigned int irq;
 304
 305         /*
 306          * Ignore the GSI from the core, and use the value in our copy of the
 307          * FADT. It may not be the same if an interrupt source override exists
 308          * for the SCI.
 309          */
 310         gsi = acpi_gbl_FADT.sci_interrupt;
 311         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 312                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 313                        gsi);
 314                 return AE_OK;
 315         }
 316
 317         acpi_irq_handler = handler;
 318         acpi_irq_context = context;
 319         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 320                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 321                 return AE_NOT_ACQUIRED;
 322         }
 323         acpi_irq_irq = irq;
 324
 325         return AE_OK;
 326 }
 327
 328 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 329 {
 330         if (irq) {
 331                 free_irq(irq, acpi_irq);
 332                 acpi_irq_handler = NULL;
 333                 acpi_irq_irq = 0;
 334         }
 335
 336         return AE_OK;
 337 }
 338
 339 /*
 340  * Running in interpreter thread context, safe to sleep
 341  */
 342
 343 void acpi_os_sleep(acpi_integer ms)
 344 {
 345         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 346 }
 347
 348 EXPORT_SYMBOL(acpi_os_sleep);
 349
 350 void acpi_os_stall(u32 us)
 351 {
 352         while (us) {
 353                 u32 delay = 1000;
 354
 355                 if (delay > us)
 356                         delay = us;
 357                 udelay(delay);
 358                 touch_nmi_watchdog();
 359                 us -= delay;
 360         }
 361 }
 362
 363 EXPORT_SYMBOL(acpi_os_stall);
 364
 365 /*
 366  * Support ACPI 3.0 AML Timer operand
 367  * Returns 64-bit free-running, monotonically increasing timer
 368  * with 100ns granularity
 369  */
 370 u64 acpi_os_get_timer(void)
 371 {
 372         static u64 t;
 373
 374 #ifdef  CONFIG_HPET
 375         /* TBD: use HPET if available */
 376 #endif
 377
 378 #ifdef  CONFIG_X86_PM_TIMER
 379         /* TBD: default to PM timer if HPET was not available */
 380 #endif
 381         if (!t)
 382                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 383
 384         return ++t;
 385 }
 386
 387 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 388 {
 389         u32 dummy;
 390
 391         if (!value)
 392                 value = &dummy;
 393
 394         switch (width) {
 395         case 8:
 396                 *(u8 *) value = inb(port);
 397                 break;
 398         case 16:
 399                 *(u16 *) value = inw(port);
 400                 break;
 401         case 32:
 402                 *(u32 *) value = inl(port);
 403                 break;
 404         default:
 405                 BUG();
 406         }
 407
 408         return AE_OK;
 409 }
 410
 411 EXPORT_SYMBOL(acpi_os_read_port);
 412
 413 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 414 {
 415         switch (width) {
 416         case 8:
 417                 outb(value, port);
 418                 break;
 419         case 16:
 420                 outw(value, port);
 421                 break;
 422         case 32:
 423                 outl(value, port);
 424                 break;
 425         default:
 426                 BUG();
 427         }
 428
 429         return AE_OK;
 430 }
 431
 432 EXPORT_SYMBOL(acpi_os_write_port);
 433
 434 acpi_status
 435 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 436 {
 437         u32 dummy;
 438         void __iomem *virt_addr;
 439
 440         virt_addr = ioremap(phys_addr, width);
 441         if (!value)
 442                 value = &dummy;
 443
 444         switch (width) {
 445         case 8:
 446                 *(u8 *) value = readb(virt_addr);
 447                 break;
 448         case 16:
 449                 *(u16 *) value = readw(virt_addr);
 450                 break;
 451         case 32:
 452                 *(u32 *) value = readl(virt_addr);
 453                 break;
 454         default:
 455                 BUG();
 456         }
 457
 458         iounmap(virt_addr);
 459
 460         return AE_OK;
 461 }
 462
 463 acpi_status
 464 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 465 {
 466         void __iomem *virt_addr;
 467
 468         virt_addr = ioremap(phys_addr, width);
 469
 470         switch (width) {
 471         case 8:
 472                 writeb(value, virt_addr);
 473                 break;
 474         case 16:
 475                 writew(value, virt_addr);
 476                 break;
 477         case 32:
 478                 writel(value, virt_addr);
 479                 break;
 480         default:
 481                 BUG();
 482         }
 483
 484         iounmap(virt_addr);
 485
 486         return AE_OK;
 487 }
 488
 489 acpi_status
 490 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 491                                void *value, u32 width)
 492 {
 493         int result, size;
 494
 495         if (!value)
 496                 return AE_BAD_PARAMETER;
 497
 498         switch (width) {
 499         case 8:
 500                 size = 1;
 501                 break;
 502         case 16:
 503                 size = 2;
 504                 break;
 505         case 32:
 506                 size = 4;
 507                 break;
 508         default:
 509                 return AE_ERROR;
 510         }
 511
 512         BUG_ON(!raw_pci_ops);
 513
 514         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 515                                    PCI_DEVFN(pci_id->device, pci_id->function),
 516                                    reg, size, value);
 517
 518         return (result ? AE_ERROR : AE_OK);
 519 }
 520
 521 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 522
 523 acpi_status
 524 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 525                                 acpi_integer value, u32 width)
 526 {
 527         int result, size;
 528
 529         switch (width) {
 530         case 8:
 531                 size = 1;
 532                 break;
 533         case 16:
 534                 size = 2;
 535                 break;
 536         case 32:
 537                 size = 4;
 538                 break;
 539         default:
 540                 return AE_ERROR;
 541         }
 542
 543         BUG_ON(!raw_pci_ops);
 544
 545         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 546                                     PCI_DEVFN(pci_id->device, pci_id->function),
 547                                     reg, size, value);
 548
 549         return (result ? AE_ERROR : AE_OK);
 550 }
 551
 552 /* TODO: Change code to take advantage of driver model more */
 553 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 554                                     acpi_handle chandle,        /* current node */
 555                                     struct acpi_pci_id **id,
 556                                     int *is_bridge, u8 * bus_number)
 557 {
 558         acpi_handle handle;
 559         struct acpi_pci_id *pci_id = *id;
 560         acpi_status status;
 561         unsigned long temp;
 562         acpi_object_type type;
 563         u8 tu8;
 564
 565         acpi_get_parent(chandle, &handle);
 566         if (handle != rhandle) {
 567                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 568                                         bus_number);
 569
 570                 status = acpi_get_type(handle, &type);
 571                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 572                         return;
 573
 574                 status =
 575                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 576                                           &temp);
 577                 if (ACPI_SUCCESS(status)) {
 578                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 579                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 580
 581                         if (*is_bridge)
 582                                 pci_id->bus = *bus_number;
 583
 584                         /* any nicer way to get bus number of bridge ? */
 585                         status =
 586                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 587                                                            8);
 588                         if (ACPI_SUCCESS(status)
 589                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 590                                 status =
 591                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 592                                                                    &tu8, 8);
 593                                 if (!ACPI_SUCCESS(status)) {
 594                                         /* Certainly broken...  FIX ME */
 595                                         return;
 596                                 }
 597                                 *is_bridge = 1;
 598                                 pci_id->bus = tu8;
 599                                 status =
 600                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 601                                                                    &tu8, 8);
 602                                 if (ACPI_SUCCESS(status)) {
 603                                         *bus_number = tu8;
 604                                 }
 605                         } else
 606                                 *is_bridge = 0;
 607                 }
 608         }
 609 }
 610
 611 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 612                            acpi_handle chandle, /* current node */
 613                            struct acpi_pci_id **id)
 614 {
 615         int is_bridge = 1;
 616         u8 bus_number = (*id)->bus;
 617
 618         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 619 }
 620
 621 static void acpi_os_execute_deferred(struct work_struct *work)
 622 {
 623         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 624         if (!dpc) {
 625                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 626                 return;
 627         }
 628
 629         dpc->function(dpc->context);
 630         kfree(dpc);
 631
 632         /* Yield cpu to notify thread */
 633         cond_resched();
 634
 635         return;
 636 }
 637
 638 static void acpi_os_execute_notify(struct work_struct *work)
 639 {
 640         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 641
 642         if (!dpc) {
 643                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 644                 return;
 645         }
 646
 647         dpc->function(dpc->context);
 648
 649         kfree(dpc);
 650
 651         return;
 652 }
 653
 654 /*******************************************************************************
 655  *
 656  * FUNCTION:    acpi_os_execute
 657  *
 658  * PARAMETERS:  Type               - Type of the callback
 659  *              Function           - Function to be executed
 660  *              Context            - Function parameters
 661  *
 662  * RETURN:      Status
 663  *
 664  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 665  *              immediately executes function on a separate thread.
 666  *
 667  ******************************************************************************/
 668
 669 acpi_status acpi_os_execute(acpi_execute_type type,
 670                             acpi_osd_exec_callback function, void *context)
 671 {
 672         acpi_status status = AE_OK;
 673         struct acpi_os_dpc *dpc;
 674
 675         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 676                           "Scheduling function [%p(%p)] for deferred execution.\n",
 677                           function, context));
 678
 679         if (!function)
 680                 return AE_BAD_PARAMETER;
 681
 682         /*
 683          * Allocate/initialize DPC structure.  Note that this memory will be
 684          * freed by the callee.  The kernel handles the work_struct list  in a
 685          * way that allows us to also free its memory inside the callee.
 686          * Because we may want to schedule several tasks with different
 687          * parameters we can't use the approach some kernel code uses of
 688          * having a static work_struct.
 689          */
 690
 691         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 692         if (!dpc)
 693                 return_ACPI_STATUS(AE_NO_MEMORY);
 694
 695         dpc->function = function;
 696         dpc->context = context;
 697
 698         if (type == OSL_NOTIFY_HANDLER) {
 699                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 700                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 701                         status = AE_ERROR;
 702                         kfree(dpc);
 703                 }
 704         } else {
 705                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 706                 if (!queue_work(kacpid_wq, &dpc->work)) {
 707                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 708                                   "Call to queue_work() failed.\n"));
 709                         status = AE_ERROR;
 710                         kfree(dpc);
 711                 }
 712         }
 713         return_ACPI_STATUS(status);
 714 }
 715
 716 EXPORT_SYMBOL(acpi_os_execute);
 717
 718 void acpi_os_wait_events_complete(void *context)
 719 {
 720         flush_workqueue(kacpid_wq);
 721 }
 722
 723 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 724
 725 /*
 726  * Allocate the memory for a spinlock and initialize it.
 727  */
 728 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 729 {
 730         spin_lock_init(*handle);
 731
 732         return AE_OK;
 733 }
 734
 735 /*
 736  * Deallocate the memory for a spinlock.
 737  */
 738 void acpi_os_delete_lock(acpi_spinlock handle)
 739 {
 740         return;
 741 }
 742
 743 acpi_status
 744 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 745 {
 746         struct semaphore *sem = NULL;
 747
 748
 749         sem = acpi_os_allocate(sizeof(struct semaphore));
 750         if (!sem)
 751                 return AE_NO_MEMORY;
 752         memset(sem, 0, sizeof(struct semaphore));
 753
 754         sema_init(sem, initial_units);
 755
 756         *handle = (acpi_handle *) sem;
 757
 758         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 759                           *handle, initial_units));
 760
 761         return AE_OK;
 762 }
 763
 764 EXPORT_SYMBOL(acpi_os_create_semaphore);
 765
 766 /*
 767  * TODO: A better way to delete semaphores?  Linux doesn't have a
 768  * 'delete_semaphore()' function -- may result in an invalid
 769  * pointer dereference for non-synchronized consumers.  Should
 770  * we at least check for blocked threads and signal/cancel them?
 771  */
 772
 773 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 774 {
 775         struct semaphore *sem = (struct semaphore *)handle;
 776
 777
 778         if (!sem)
 779                 return AE_BAD_PARAMETER;
 780
 781         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 782
 783         kfree(sem);
 784         sem = NULL;
 785
 786         return AE_OK;
 787 }
 788
 789 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 790
 791 /*
 792  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 793  * improvise.  The process is to sleep for one scheduler quantum
 794  * until the semaphore becomes available.  Downside is that this
 795  * may result in starvation for timeout-based waits when there's
 796  * lots of semaphore activity.
 797  *
 798  * TODO: Support for units > 1?
 799  */
 800 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 801 {
 802         acpi_status status = AE_OK;
 803         struct semaphore *sem = (struct semaphore *)handle;
 804         int ret = 0;
 805
 806
 807         if (!sem || (units < 1))
 808                 return AE_BAD_PARAMETER;
 809
 810         if (units > 1)
 811                 return AE_SUPPORT;
 812
 813         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 814                           handle, units, timeout));
 815
 816         /*
 817          * This can be called during resume with interrupts off.
 818          * Like boot-time, we should be single threaded and will
 819          * always get the lock if we try -- timeout or not.
 820          * If this doesn't succeed, then we will oops courtesy of
 821          * might_sleep() in down().
 822          */
 823         if (!down_trylock(sem))
 824                 return AE_OK;
 825
 826         switch (timeout) {
 827                 /*
 828                  * No Wait:
 829                  * --------
 830                  * A zero timeout value indicates that we shouldn't wait - just
 831                  * acquire the semaphore if available otherwise return AE_TIME
 832                  * (a.k.a. 'would block').
 833                  */
 834         case 0:
 835                 if (down_trylock(sem))
 836                         status = AE_TIME;
 837                 break;
 838
 839                 /*
 840                  * Wait Indefinitely:
 841                  * ------------------
 842                  */
 843         case ACPI_WAIT_FOREVER:
 844                 down(sem);
 845                 break;
 846
 847                 /*
 848                  * Wait w/ Timeout:
 849                  * ----------------
 850                  */
 851         default:
 852                 // TODO: A better timeout algorithm?
 853                 {
 854                         int i = 0;
 855                         static const int quantum_ms = 1000 / HZ;
 856
 857                         ret = down_trylock(sem);
 858                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 859                                 schedule_timeout_interruptible(1);
 860                                 ret = down_trylock(sem);
 861                         }
 862
 863                         if (ret != 0)
 864                                 status = AE_TIME;
 865                 }
 866                 break;
 867         }
 868
 869         if (ACPI_FAILURE(status)) {
 870                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 871                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 872                                   handle, units, timeout,
 873                                   acpi_format_exception(status)));
 874         } else {
 875                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 876                                   "Acquired semaphore[%p|%d|%d]", handle,
 877                                   units, timeout));
 878         }
 879
 880         return status;
 881 }
 882
 883 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 884
 885 /*
 886  * TODO: Support for units > 1?
 887  */
 888 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 889 {
 890         struct semaphore *sem = (struct semaphore *)handle;
 891
 892
 893         if (!sem || (units < 1))
 894                 return AE_BAD_PARAMETER;
 895
 896         if (units > 1)
 897                 return AE_SUPPORT;
 898
 899         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 900                           units));
 901
 902         up(sem);
 903
 904         return AE_OK;
 905 }
 906
 907 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 908
 909 #ifdef ACPI_FUTURE_USAGE
 910 u32 acpi_os_get_line(char *buffer)
 911 {
 912
 913 #ifdef ENABLE_DEBUGGER
 914         if (acpi_in_debugger) {
 915                 u32 chars;
 916
 917                 kdb_read(buffer, sizeof(line_buf));
 918
 919                 /* remove the CR kdb includes */
 920                 chars = strlen(buffer) - 1;
 921                 buffer[chars] = '\0';
 922         }
 923 #endif
 924
 925         return 0;
 926 }
 927 #endif                          /*  ACPI_FUTURE_USAGE  */
 928
 929 acpi_status acpi_os_signal(u32 function, void *info)
 930 {
 931         switch (function) {
 932         case ACPI_SIGNAL_FATAL:
 933                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 934                 break;
 935         case ACPI_SIGNAL_BREAKPOINT:
 936                 /*
 937                  * AML Breakpoint
 938                  * ACPI spec. says to treat it as a NOP unless
 939                  * you are debugging.  So if/when we integrate
 940                  * AML debugger into the kernel debugger its
 941                  * hook will go here.  But until then it is
 942                  * not useful to print anything on breakpoints.
 943                  */
 944                 break;
 945         default:
 946                 break;
 947         }
 948
 949         return AE_OK;
 950 }
 951
 952 EXPORT_SYMBOL(acpi_os_signal);
 953
 954 static int __init acpi_os_name_setup(char *str)
 955 {
 956         char *p = acpi_os_name;
 957         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 958
 959         if (!str || !*str)
 960                 return 0;
 961
 962         for (; count-- && str && *str; str++) {
 963                 if (isalnum(*str) || *str == ' ' || *str == ':')
 964                         *p++ = *str;
 965                 else if (*str == '\'' || *str == '"')
 966                         continue;
 967                 else
 968                         break;
 969         }
 970         *p = 0;
 971
 972         return 1;
 973
 974 }
 975
 976 __setup("acpi_os_name=", acpi_os_name_setup);
 977
 978 static void enable_osi_linux(int enable) {
 979
 980         if (osi_linux != enable)
 981                 printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",
 982                         enable ? "En": "Dis");
 983
 984         osi_linux = enable;
 985         return;
 986 }
 987
 988 /*
 989  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 990  *
 991  * empty string disables _OSI
 992  * string starting with '!' disables that string
 993  * otherwise string is added to list, augmenting built-in strings
 994  */
 995 static int __init acpi_osi_setup(char *str)
 996 {
 997         if (str == NULL || *str == '\0') {
 998                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 999                 acpi_gbl_create_osi_method = FALSE;
1000         } else if (!strcmp("!Linux", str)) {
1001                 enable_osi_linux(0);
1002         } else if (*str == '!') {
1003                 if (acpi_osi_invalidate(++str) == AE_OK)
1004                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1005         } else if (!strcmp("Linux", str)) {
1006                 enable_osi_linux(1);
1007         } else if (*osi_additional_string == '\0') {
1008                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1009                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1010         }
1011
1012         return 1;
1013 }
1014
1015 __setup("acpi_osi=", acpi_osi_setup);
1016
1017 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1018 static int __init acpi_serialize_setup(char *str)
1019 {
1020         printk(KERN_INFO PREFIX "serialize enabled\n");
1021
1022         acpi_gbl_all_methods_serialized = TRUE;
1023
1024         return 1;
1025 }
1026
1027 __setup("acpi_serialize", acpi_serialize_setup);
1028
1029 /*
1030  * Wake and Run-Time GPES are expected to be separate.
1031  * We disable wake-GPEs at run-time to prevent spurious
1032  * interrupts.
1033  *
1034  * However, if a system exists that shares Wake and
1035  * Run-time events on the same GPE this flag is available
1036  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1037  */
1038 static int __init acpi_wake_gpes_always_on_setup(char *str)
1039 {
1040         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1041
1042         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1043
1044         return 1;
1045 }
1046
1047 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1048
1049 /*
1050  * Acquire a spinlock.
1051  *
1052  * handle is a pointer to the spinlock_t.
1053  */
1054
1055 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1056 {
1057         acpi_cpu_flags flags;
1058         spin_lock_irqsave(lockp, flags);
1059         return flags;
1060 }
1061
1062 /*
1063  * Release a spinlock. See above.
1064  */
1065
1066 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1067 {
1068         spin_unlock_irqrestore(lockp, flags);
1069 }
1070
1071 #ifndef ACPI_USE_LOCAL_CACHE
1072
1073 /*******************************************************************************
1074  *
1075  * FUNCTION:    acpi_os_create_cache
1076  *
1077  * PARAMETERS:  name      - Ascii name for the cache
1078  *              size      - Size of each cached object
1079  *              depth     - Maximum depth of the cache (in objects) <ignored>
1080  *              cache     - Where the new cache object is returned
1081  *
1082  * RETURN:      status
1083  *
1084  * DESCRIPTION: Create a cache object
1085  *
1086  ******************************************************************************/
1087
1088 acpi_status
1089 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1090 {
1091         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1092         if (*cache == NULL)
1093                 return AE_ERROR;
1094         else
1095                 return AE_OK;
1096 }
1097
1098 /*******************************************************************************
1099  *
1100  * FUNCTION:    acpi_os_purge_cache
1101  *
1102  * PARAMETERS:  Cache           - Handle to cache object
1103  *
1104  * RETURN:      Status
1105  *
1106  * DESCRIPTION: Free all objects within the requested cache.
1107  *
1108  ******************************************************************************/
1109
1110 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1111 {
1112         kmem_cache_shrink(cache);
1113         return (AE_OK);
1114 }
1115
1116 /*******************************************************************************
1117  *
1118  * FUNCTION:    acpi_os_delete_cache
1119  *
1120  * PARAMETERS:  Cache           - Handle to cache object
1121  *
1122  * RETURN:      Status
1123  *
1124  * DESCRIPTION: Free all objects within the requested cache and delete the
1125  *              cache object.
1126  *
1127  ******************************************************************************/
1128
1129 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1130 {
1131         kmem_cache_destroy(cache);
1132         return (AE_OK);
1133 }
1134
1135 /*******************************************************************************
1136  *
1137  * FUNCTION:    acpi_os_release_object
1138  *
1139  * PARAMETERS:  Cache       - Handle to cache object
1140  *              Object      - The object to be released
1141  *
1142  * RETURN:      None
1143  *
1144  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1145  *              the object is deleted.
1146  *
1147  ******************************************************************************/
1148
1149 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1150 {
1151         kmem_cache_free(cache, object);
1152         return (AE_OK);
1153 }
1154
1155 /******************************************************************************
1156  *
1157  * FUNCTION:    acpi_os_validate_interface
1158  *
1159  * PARAMETERS:  interface           - Requested interface to be validated
1160  *
1161  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1162  *
1163  * DESCRIPTION: Match an interface string to the interfaces supported by the
1164  *              host. Strings originate from an AML call to the _OSI method.
1165  *
1166  *****************************************************************************/
1167
1168 acpi_status
1169 acpi_os_validate_interface (char *interface)
1170 {
1171         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1172                 return AE_OK;
1173         if (!strcmp("Linux", interface)) {
1174                 printk(KERN_WARNING PREFIX
1175                         "System BIOS is requesting _OSI(Linux)\n");
1176                 printk(KERN_WARNING PREFIX
1177                         "If \"acpi_osi=Linux\" works better,\n"
1178                         "Please send dmidecode "
1179                         "to linux-acpi@vger.kernel.org\n");
1180                 if(osi_linux)
1181                         return AE_OK;
1182         }
1183         return AE_SUPPORT;
1184 }
1185
1186 /******************************************************************************
1187  *
1188  * FUNCTION:    acpi_os_validate_address
1189  *
1190  * PARAMETERS:  space_id             - ACPI space ID
1191  *              address             - Physical address
1192  *              length              - Address length
1193  *
1194  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1195  *              should return AE_AML_ILLEGAL_ADDRESS.
1196  *
1197  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1198  *              the addresses accessed by AML operation regions.
1199  *
1200  *****************************************************************************/
1201
1202 acpi_status
1203 acpi_os_validate_address (
1204     u8                   space_id,
1205     acpi_physical_address   address,
1206     acpi_size               length)
1207 {
1208
1209     return AE_OK;
1210 }
1211
1212 #ifdef CONFIG_DMI
1213 static int dmi_osi_linux(const struct dmi_system_id *d)
1214 {
1215         printk(KERN_NOTICE "%s detected: enabling _OSI(Linux)\n", d->ident);
1216         enable_osi_linux(1);
1217         return 0;
1218 }
1219
1220 static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {
1221         /*
1222          * Boxes that need _OSI(Linux)
1223          */
1224         {
1225          .callback = dmi_osi_linux,
1226          .ident = "Intel Napa CRB",
1227          .matches = {
1228                      DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
1229                      DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),
1230                      },
1231          },
1232         {}
1233 };
1234 #endif /* CONFIG_DMI */
1235
1236 #endif