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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 #define OSI_LINUX_ENABLED
  81 #ifdef  OSI_LINUX_ENABLED
  82 int osi_linux = 1;      /* enable _OSI(Linux) by default */
  83 #else
  84 int osi_linux;          /* disable _OSI(Linux) by default */
  85 #endif
  86
  87
  88 #ifdef CONFIG_DMI
  89 static struct __initdata dmi_system_id acpi_osl_dmi_table[];
  90 #endif
  91
  92 static void __init acpi_request_region (struct acpi_generic_address *addr,
  93         unsigned int length, char *desc)
  94 {
  95         struct resource *res;
  96
  97         if (!addr->address || !length)
  98                 return;
  99
 100         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 101                 res = request_region(addr->address, length, desc);
 102         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 103                 res = request_mem_region(addr->address, length, desc);
 104 }
 105
 106 static int __init acpi_reserve_resources(void)
 107 {
 108         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 109                 "ACPI PM1a_EVT_BLK");
 110
 111         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 112                 "ACPI PM1b_EVT_BLK");
 113
 114         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 115                 "ACPI PM1a_CNT_BLK");
 116
 117         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 118                 "ACPI PM1b_CNT_BLK");
 119
 120         if (acpi_gbl_FADT.pm_timer_length == 4)
 121                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 122
 123         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 124                 "ACPI PM2_CNT_BLK");
 125
 126         /* Length of GPE blocks must be a non-negative multiple of 2 */
 127
 128         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 129                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 130                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 131
 132         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 133                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 134                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 135
 136         return 0;
 137 }
 138 device_initcall(acpi_reserve_resources);
 139
 140 acpi_status __init acpi_os_initialize(void)
 141 {
 142         dmi_check_system(acpi_osl_dmi_table);
 143         return AE_OK;
 144 }
 145
 146 acpi_status acpi_os_initialize1(void)
 147 {
 148         /*
 149          * Initialize PCI configuration space access, as we'll need to access
 150          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 151          */
 152         if (!raw_pci_ops) {
 153                 printk(KERN_ERR PREFIX
 154                        "Access to PCI configuration space unavailable\n");
 155                 return AE_NULL_ENTRY;
 156         }
 157         kacpid_wq = create_singlethread_workqueue("kacpid");
 158         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 159         BUG_ON(!kacpid_wq);
 160         BUG_ON(!kacpi_notify_wq);
 161         return AE_OK;
 162 }
 163
 164 acpi_status acpi_os_terminate(void)
 165 {
 166         if (acpi_irq_handler) {
 167                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 168                                                  acpi_irq_handler);
 169         }
 170
 171         destroy_workqueue(kacpid_wq);
 172         destroy_workqueue(kacpi_notify_wq);
 173
 174         return AE_OK;
 175 }
 176
 177 void acpi_os_printf(const char *fmt, ...)
 178 {
 179         va_list args;
 180         va_start(args, fmt);
 181         acpi_os_vprintf(fmt, args);
 182         va_end(args);
 183 }
 184
 185 EXPORT_SYMBOL(acpi_os_printf);
 186
 187 void acpi_os_vprintf(const char *fmt, va_list args)
 188 {
 189         static char buffer[512];
 190
 191         vsprintf(buffer, fmt, args);
 192
 193 #ifdef ENABLE_DEBUGGER
 194         if (acpi_in_debugger) {
 195                 kdb_printf("%s", buffer);
 196         } else {
 197                 printk("%s", buffer);
 198         }
 199 #else
 200         printk("%s", buffer);
 201 #endif
 202 }
 203
 204 acpi_physical_address __init acpi_os_get_root_pointer(void)
 205 {
 206         if (efi_enabled) {
 207                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 208                         return efi.acpi20;
 209                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 210                         return efi.acpi;
 211                 else {
 212                         printk(KERN_ERR PREFIX
 213                                "System description tables not found\n");
 214                         return 0;
 215                 }
 216         } else
 217                 return acpi_find_rsdp();
 218 }
 219
 220 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 221 {
 222         if (phys > ULONG_MAX) {
 223                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 224                 return NULL;
 225         }
 226         if (acpi_gbl_permanent_mmap)
 227                 /*
 228                 * ioremap checks to ensure this is in reserved space
 229                 */
 230                 return ioremap((unsigned long)phys, size);
 231         else
 232                 return __acpi_map_table((unsigned long)phys, size);
 233 }
 234 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 235
 236 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 237 {
 238         if (acpi_gbl_permanent_mmap) {
 239                 iounmap(virt);
 240         }
 241 }
 242 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 243
 244 #ifdef ACPI_FUTURE_USAGE
 245 acpi_status
 246 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 247 {
 248         if (!phys || !virt)
 249                 return AE_BAD_PARAMETER;
 250
 251         *phys = virt_to_phys(virt);
 252
 253         return AE_OK;
 254 }
 255 #endif
 256
 257 #define ACPI_MAX_OVERRIDE_LEN 100
 258
 259 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 260
 261 acpi_status
 262 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 263                             acpi_string * new_val)
 264 {
 265         if (!init_val || !new_val)
 266                 return AE_BAD_PARAMETER;
 267
 268         *new_val = NULL;
 269         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 270                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 271                        acpi_os_name);
 272                 *new_val = acpi_os_name;
 273         }
 274
 275         return AE_OK;
 276 }
 277
 278 acpi_status
 279 acpi_os_table_override(struct acpi_table_header * existing_table,
 280                        struct acpi_table_header ** new_table)
 281 {
 282         if (!existing_table || !new_table)
 283                 return AE_BAD_PARAMETER;
 284
 285 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 286         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 287                 *new_table = (struct acpi_table_header *)AmlCode;
 288         else
 289                 *new_table = NULL;
 290 #else
 291         *new_table = NULL;
 292 #endif
 293         return AE_OK;
 294 }
 295
 296 static irqreturn_t acpi_irq(int irq, void *dev_id)
 297 {
 298         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 299 }
 300
 301 acpi_status
 302 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 303                                   void *context)
 304 {
 305         unsigned int irq;
 306
 307         /*
 308          * Ignore the GSI from the core, and use the value in our copy of the
 309          * FADT. It may not be the same if an interrupt source override exists
 310          * for the SCI.
 311          */
 312         gsi = acpi_gbl_FADT.sci_interrupt;
 313         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 314                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 315                        gsi);
 316                 return AE_OK;
 317         }
 318
 319         acpi_irq_handler = handler;
 320         acpi_irq_context = context;
 321         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 322                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 323                 return AE_NOT_ACQUIRED;
 324         }
 325         acpi_irq_irq = irq;
 326
 327         return AE_OK;
 328 }
 329
 330 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 331 {
 332         if (irq) {
 333                 free_irq(irq, acpi_irq);
 334                 acpi_irq_handler = NULL;
 335                 acpi_irq_irq = 0;
 336         }
 337
 338         return AE_OK;
 339 }
 340
 341 /*
 342  * Running in interpreter thread context, safe to sleep
 343  */
 344
 345 void acpi_os_sleep(acpi_integer ms)
 346 {
 347         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 348 }
 349
 350 EXPORT_SYMBOL(acpi_os_sleep);
 351
 352 void acpi_os_stall(u32 us)
 353 {
 354         while (us) {
 355                 u32 delay = 1000;
 356
 357                 if (delay > us)
 358                         delay = us;
 359                 udelay(delay);
 360                 touch_nmi_watchdog();
 361                 us -= delay;
 362         }
 363 }
 364
 365 EXPORT_SYMBOL(acpi_os_stall);
 366
 367 /*
 368  * Support ACPI 3.0 AML Timer operand
 369  * Returns 64-bit free-running, monotonically increasing timer
 370  * with 100ns granularity
 371  */
 372 u64 acpi_os_get_timer(void)
 373 {
 374         static u64 t;
 375
 376 #ifdef  CONFIG_HPET
 377         /* TBD: use HPET if available */
 378 #endif
 379
 380 #ifdef  CONFIG_X86_PM_TIMER
 381         /* TBD: default to PM timer if HPET was not available */
 382 #endif
 383         if (!t)
 384                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 385
 386         return ++t;
 387 }
 388
 389 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 390 {
 391         u32 dummy;
 392
 393         if (!value)
 394                 value = &dummy;
 395
 396         switch (width) {
 397         case 8:
 398                 *(u8 *) value = inb(port);
 399                 break;
 400         case 16:
 401                 *(u16 *) value = inw(port);
 402                 break;
 403         case 32:
 404                 *(u32 *) value = inl(port);
 405                 break;
 406         default:
 407                 BUG();
 408         }
 409
 410         return AE_OK;
 411 }
 412
 413 EXPORT_SYMBOL(acpi_os_read_port);
 414
 415 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 416 {
 417         switch (width) {
 418         case 8:
 419                 outb(value, port);
 420                 break;
 421         case 16:
 422                 outw(value, port);
 423                 break;
 424         case 32:
 425                 outl(value, port);
 426                 break;
 427         default:
 428                 BUG();
 429         }
 430
 431         return AE_OK;
 432 }
 433
 434 EXPORT_SYMBOL(acpi_os_write_port);
 435
 436 acpi_status
 437 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 438 {
 439         u32 dummy;
 440         void __iomem *virt_addr;
 441
 442         virt_addr = ioremap(phys_addr, width);
 443         if (!value)
 444                 value = &dummy;
 445
 446         switch (width) {
 447         case 8:
 448                 *(u8 *) value = readb(virt_addr);
 449                 break;
 450         case 16:
 451                 *(u16 *) value = readw(virt_addr);
 452                 break;
 453         case 32:
 454                 *(u32 *) value = readl(virt_addr);
 455                 break;
 456         default:
 457                 BUG();
 458         }
 459
 460         iounmap(virt_addr);
 461
 462         return AE_OK;
 463 }
 464
 465 acpi_status
 466 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 467 {
 468         void __iomem *virt_addr;
 469
 470         virt_addr = ioremap(phys_addr, width);
 471
 472         switch (width) {
 473         case 8:
 474                 writeb(value, virt_addr);
 475                 break;
 476         case 16:
 477                 writew(value, virt_addr);
 478                 break;
 479         case 32:
 480                 writel(value, virt_addr);
 481                 break;
 482         default:
 483                 BUG();
 484         }
 485
 486         iounmap(virt_addr);
 487
 488         return AE_OK;
 489 }
 490
 491 acpi_status
 492 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 493                                void *value, u32 width)
 494 {
 495         int result, size;
 496
 497         if (!value)
 498                 return AE_BAD_PARAMETER;
 499
 500         switch (width) {
 501         case 8:
 502                 size = 1;
 503                 break;
 504         case 16:
 505                 size = 2;
 506                 break;
 507         case 32:
 508                 size = 4;
 509                 break;
 510         default:
 511                 return AE_ERROR;
 512         }
 513
 514         BUG_ON(!raw_pci_ops);
 515
 516         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 517                                    PCI_DEVFN(pci_id->device, pci_id->function),
 518                                    reg, size, value);
 519
 520         return (result ? AE_ERROR : AE_OK);
 521 }
 522
 523 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 524
 525 acpi_status
 526 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 527                                 acpi_integer value, u32 width)
 528 {
 529         int result, size;
 530
 531         switch (width) {
 532         case 8:
 533                 size = 1;
 534                 break;
 535         case 16:
 536                 size = 2;
 537                 break;
 538         case 32:
 539                 size = 4;
 540                 break;
 541         default:
 542                 return AE_ERROR;
 543         }
 544
 545         BUG_ON(!raw_pci_ops);
 546
 547         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 548                                     PCI_DEVFN(pci_id->device, pci_id->function),
 549                                     reg, size, value);
 550
 551         return (result ? AE_ERROR : AE_OK);
 552 }
 553
 554 /* TODO: Change code to take advantage of driver model more */
 555 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 556                                     acpi_handle chandle,        /* current node */
 557                                     struct acpi_pci_id **id,
 558                                     int *is_bridge, u8 * bus_number)
 559 {
 560         acpi_handle handle;
 561         struct acpi_pci_id *pci_id = *id;
 562         acpi_status status;
 563         unsigned long temp;
 564         acpi_object_type type;
 565         u8 tu8;
 566
 567         acpi_get_parent(chandle, &handle);
 568         if (handle != rhandle) {
 569                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 570                                         bus_number);
 571
 572                 status = acpi_get_type(handle, &type);
 573                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 574                         return;
 575
 576                 status =
 577                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 578                                           &temp);
 579                 if (ACPI_SUCCESS(status)) {
 580                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 581                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 582
 583                         if (*is_bridge)
 584                                 pci_id->bus = *bus_number;
 585
 586                         /* any nicer way to get bus number of bridge ? */
 587                         status =
 588                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 589                                                            8);
 590                         if (ACPI_SUCCESS(status)
 591                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 592                                 status =
 593                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 594                                                                    &tu8, 8);
 595                                 if (!ACPI_SUCCESS(status)) {
 596                                         /* Certainly broken...  FIX ME */
 597                                         return;
 598                                 }
 599                                 *is_bridge = 1;
 600                                 pci_id->bus = tu8;
 601                                 status =
 602                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 603                                                                    &tu8, 8);
 604                                 if (ACPI_SUCCESS(status)) {
 605                                         *bus_number = tu8;
 606                                 }
 607                         } else
 608                                 *is_bridge = 0;
 609                 }
 610         }
 611 }
 612
 613 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 614                            acpi_handle chandle, /* current node */
 615                            struct acpi_pci_id **id)
 616 {
 617         int is_bridge = 1;
 618         u8 bus_number = (*id)->bus;
 619
 620         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 621 }
 622
 623 static void acpi_os_execute_deferred(struct work_struct *work)
 624 {
 625         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 626         if (!dpc) {
 627                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 628                 return;
 629         }
 630
 631         dpc->function(dpc->context);
 632         kfree(dpc);
 633
 634         /* Yield cpu to notify thread */
 635         cond_resched();
 636
 637         return;
 638 }
 639
 640 static void acpi_os_execute_notify(struct work_struct *work)
 641 {
 642         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 643
 644         if (!dpc) {
 645                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 646                 return;
 647         }
 648
 649         dpc->function(dpc->context);
 650
 651         kfree(dpc);
 652
 653         return;
 654 }
 655
 656 /*******************************************************************************
 657  *
 658  * FUNCTION:    acpi_os_execute
 659  *
 660  * PARAMETERS:  Type               - Type of the callback
 661  *              Function           - Function to be executed
 662  *              Context            - Function parameters
 663  *
 664  * RETURN:      Status
 665  *
 666  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 667  *              immediately executes function on a separate thread.
 668  *
 669  ******************************************************************************/
 670
 671 acpi_status acpi_os_execute(acpi_execute_type type,
 672                             acpi_osd_exec_callback function, void *context)
 673 {
 674         acpi_status status = AE_OK;
 675         struct acpi_os_dpc *dpc;
 676
 677         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 678                           "Scheduling function [%p(%p)] for deferred execution.\n",
 679                           function, context));
 680
 681         if (!function)
 682                 return AE_BAD_PARAMETER;
 683
 684         /*
 685          * Allocate/initialize DPC structure.  Note that this memory will be
 686          * freed by the callee.  The kernel handles the work_struct list  in a
 687          * way that allows us to also free its memory inside the callee.
 688          * Because we may want to schedule several tasks with different
 689          * parameters we can't use the approach some kernel code uses of
 690          * having a static work_struct.
 691          */
 692
 693         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 694         if (!dpc)
 695                 return_ACPI_STATUS(AE_NO_MEMORY);
 696
 697         dpc->function = function;
 698         dpc->context = context;
 699
 700         if (type == OSL_NOTIFY_HANDLER) {
 701                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 702                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 703                         status = AE_ERROR;
 704                         kfree(dpc);
 705                 }
 706         } else {
 707                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 708                 if (!queue_work(kacpid_wq, &dpc->work)) {
 709                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 710                                   "Call to queue_work() failed.\n"));
 711                         status = AE_ERROR;
 712                         kfree(dpc);
 713                 }
 714         }
 715         return_ACPI_STATUS(status);
 716 }
 717
 718 EXPORT_SYMBOL(acpi_os_execute);
 719
 720 void acpi_os_wait_events_complete(void *context)
 721 {
 722         flush_workqueue(kacpid_wq);
 723 }
 724
 725 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 726
 727 /*
 728  * Allocate the memory for a spinlock and initialize it.
 729  */
 730 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 731 {
 732         spin_lock_init(*handle);
 733
 734         return AE_OK;
 735 }
 736
 737 /*
 738  * Deallocate the memory for a spinlock.
 739  */
 740 void acpi_os_delete_lock(acpi_spinlock handle)
 741 {
 742         return;
 743 }
 744
 745 acpi_status
 746 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 747 {
 748         struct semaphore *sem = NULL;
 749
 750
 751         sem = acpi_os_allocate(sizeof(struct semaphore));
 752         if (!sem)
 753                 return AE_NO_MEMORY;
 754         memset(sem, 0, sizeof(struct semaphore));
 755
 756         sema_init(sem, initial_units);
 757
 758         *handle = (acpi_handle *) sem;
 759
 760         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 761                           *handle, initial_units));
 762
 763         return AE_OK;
 764 }
 765
 766 EXPORT_SYMBOL(acpi_os_create_semaphore);
 767
 768 /*
 769  * TODO: A better way to delete semaphores?  Linux doesn't have a
 770  * 'delete_semaphore()' function -- may result in an invalid
 771  * pointer dereference for non-synchronized consumers.  Should
 772  * we at least check for blocked threads and signal/cancel them?
 773  */
 774
 775 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 776 {
 777         struct semaphore *sem = (struct semaphore *)handle;
 778
 779
 780         if (!sem)
 781                 return AE_BAD_PARAMETER;
 782
 783         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 784
 785         kfree(sem);
 786         sem = NULL;
 787
 788         return AE_OK;
 789 }
 790
 791 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 792
 793 /*
 794  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 795  * improvise.  The process is to sleep for one scheduler quantum
 796  * until the semaphore becomes available.  Downside is that this
 797  * may result in starvation for timeout-based waits when there's
 798  * lots of semaphore activity.
 799  *
 800  * TODO: Support for units > 1?
 801  */
 802 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 803 {
 804         acpi_status status = AE_OK;
 805         struct semaphore *sem = (struct semaphore *)handle;
 806         int ret = 0;
 807
 808
 809         if (!sem || (units < 1))
 810                 return AE_BAD_PARAMETER;
 811
 812         if (units > 1)
 813                 return AE_SUPPORT;
 814
 815         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 816                           handle, units, timeout));
 817
 818         /*
 819          * This can be called during resume with interrupts off.
 820          * Like boot-time, we should be single threaded and will
 821          * always get the lock if we try -- timeout or not.
 822          * If this doesn't succeed, then we will oops courtesy of
 823          * might_sleep() in down().
 824          */
 825         if (!down_trylock(sem))
 826                 return AE_OK;
 827
 828         switch (timeout) {
 829                 /*
 830                  * No Wait:
 831                  * --------
 832                  * A zero timeout value indicates that we shouldn't wait - just
 833                  * acquire the semaphore if available otherwise return AE_TIME
 834                  * (a.k.a. 'would block').
 835                  */
 836         case 0:
 837                 if (down_trylock(sem))
 838                         status = AE_TIME;
 839                 break;
 840
 841                 /*
 842                  * Wait Indefinitely:
 843                  * ------------------
 844                  */
 845         case ACPI_WAIT_FOREVER:
 846                 down(sem);
 847                 break;
 848
 849                 /*
 850                  * Wait w/ Timeout:
 851                  * ----------------
 852                  */
 853         default:
 854                 // TODO: A better timeout algorithm?
 855                 {
 856                         int i = 0;
 857                         static const int quantum_ms = 1000 / HZ;
 858
 859                         ret = down_trylock(sem);
 860                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 861                                 schedule_timeout_interruptible(1);
 862                                 ret = down_trylock(sem);
 863                         }
 864
 865                         if (ret != 0)
 866                                 status = AE_TIME;
 867                 }
 868                 break;
 869         }
 870
 871         if (ACPI_FAILURE(status)) {
 872                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 873                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 874                                   handle, units, timeout,
 875                                   acpi_format_exception(status)));
 876         } else {
 877                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 878                                   "Acquired semaphore[%p|%d|%d]", handle,
 879                                   units, timeout));
 880         }
 881
 882         return status;
 883 }
 884
 885 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 886
 887 /*
 888  * TODO: Support for units > 1?
 889  */
 890 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 891 {
 892         struct semaphore *sem = (struct semaphore *)handle;
 893
 894
 895         if (!sem || (units < 1))
 896                 return AE_BAD_PARAMETER;
 897
 898         if (units > 1)
 899                 return AE_SUPPORT;
 900
 901         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 902                           units));
 903
 904         up(sem);
 905
 906         return AE_OK;
 907 }
 908
 909 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 910
 911 #ifdef ACPI_FUTURE_USAGE
 912 u32 acpi_os_get_line(char *buffer)
 913 {
 914
 915 #ifdef ENABLE_DEBUGGER
 916         if (acpi_in_debugger) {
 917                 u32 chars;
 918
 919                 kdb_read(buffer, sizeof(line_buf));
 920
 921                 /* remove the CR kdb includes */
 922                 chars = strlen(buffer) - 1;
 923                 buffer[chars] = '\0';
 924         }
 925 #endif
 926
 927         return 0;
 928 }
 929 #endif                          /*  ACPI_FUTURE_USAGE  */
 930
 931 acpi_status acpi_os_signal(u32 function, void *info)
 932 {
 933         switch (function) {
 934         case ACPI_SIGNAL_FATAL:
 935                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 936                 break;
 937         case ACPI_SIGNAL_BREAKPOINT:
 938                 /*
 939                  * AML Breakpoint
 940                  * ACPI spec. says to treat it as a NOP unless
 941                  * you are debugging.  So if/when we integrate
 942                  * AML debugger into the kernel debugger its
 943                  * hook will go here.  But until then it is
 944                  * not useful to print anything on breakpoints.
 945                  */
 946                 break;
 947         default:
 948                 break;
 949         }
 950
 951         return AE_OK;
 952 }
 953
 954 EXPORT_SYMBOL(acpi_os_signal);
 955
 956 static int __init acpi_os_name_setup(char *str)
 957 {
 958         char *p = acpi_os_name;
 959         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 960
 961         if (!str || !*str)
 962                 return 0;
 963
 964         for (; count-- && str && *str; str++) {
 965                 if (isalnum(*str) || *str == ' ' || *str == ':')
 966                         *p++ = *str;
 967                 else if (*str == '\'' || *str == '"')
 968                         continue;
 969                 else
 970                         break;
 971         }
 972         *p = 0;
 973
 974         return 1;
 975
 976 }
 977
 978 __setup("acpi_os_name=", acpi_os_name_setup);
 979
 980 static void enable_osi_linux(int enable) {
 981
 982         if (osi_linux != enable)
 983                 printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",
 984                         enable ? "En": "Dis");
 985
 986         osi_linux = enable;
 987         return;
 988 }
 989
 990 /*
 991  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 992  *
 993  * empty string disables _OSI
 994  * string starting with '!' disables that string
 995  * otherwise string is added to list, augmenting built-in strings
 996  */
 997 static int __init acpi_osi_setup(char *str)
 998 {
 999         if (str == NULL || *str == '\0') {
1000                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1001                 acpi_gbl_create_osi_method = FALSE;
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(0);
1007         } else if (!strcmp("Linux", str)) {
1008                 enable_osi_linux(1);
1009         } else if (*osi_additional_string == '\0') {
1010                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1011                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1012         }
1013
1014         return 1;
1015 }
1016
1017 __setup("acpi_osi=", acpi_osi_setup);
1018
1019 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1020 static int __init acpi_serialize_setup(char *str)
1021 {
1022         printk(KERN_INFO PREFIX "serialize enabled\n");
1023
1024         acpi_gbl_all_methods_serialized = TRUE;
1025
1026         return 1;
1027 }
1028
1029 __setup("acpi_serialize", acpi_serialize_setup);
1030
1031 /*
1032  * Wake and Run-Time GPES are expected to be separate.
1033  * We disable wake-GPEs at run-time to prevent spurious
1034  * interrupts.
1035  *
1036  * However, if a system exists that shares Wake and
1037  * Run-time events on the same GPE this flag is available
1038  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1039  */
1040 static int __init acpi_wake_gpes_always_on_setup(char *str)
1041 {
1042         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1043
1044         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1045
1046         return 1;
1047 }
1048
1049 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1050
1051 /*
1052  * max_cstate is defined in the base kernel so modules can
1053  * change it w/o depending on the state of the processor module.
1054  */
1055 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1056
1057 EXPORT_SYMBOL(max_cstate);
1058
1059 /*
1060  * Acquire a spinlock.
1061  *
1062  * handle is a pointer to the spinlock_t.
1063  */
1064
1065 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1066 {
1067         acpi_cpu_flags flags;
1068         spin_lock_irqsave(lockp, flags);
1069         return flags;
1070 }
1071
1072 /*
1073  * Release a spinlock. See above.
1074  */
1075
1076 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1077 {
1078         spin_unlock_irqrestore(lockp, flags);
1079 }
1080
1081 #ifndef ACPI_USE_LOCAL_CACHE
1082
1083 /*******************************************************************************
1084  *
1085  * FUNCTION:    acpi_os_create_cache
1086  *
1087  * PARAMETERS:  name      - Ascii name for the cache
1088  *              size      - Size of each cached object
1089  *              depth     - Maximum depth of the cache (in objects) <ignored>
1090  *              cache     - Where the new cache object is returned
1091  *
1092  * RETURN:      status
1093  *
1094  * DESCRIPTION: Create a cache object
1095  *
1096  ******************************************************************************/
1097
1098 acpi_status
1099 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1100 {
1101         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1102         if (*cache == NULL)
1103                 return AE_ERROR;
1104         else
1105                 return AE_OK;
1106 }
1107
1108 /*******************************************************************************
1109  *
1110  * FUNCTION:    acpi_os_purge_cache
1111  *
1112  * PARAMETERS:  Cache           - Handle to cache object
1113  *
1114  * RETURN:      Status
1115  *
1116  * DESCRIPTION: Free all objects within the requested cache.
1117  *
1118  ******************************************************************************/
1119
1120 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1121 {
1122         kmem_cache_shrink(cache);
1123         return (AE_OK);
1124 }
1125
1126 /*******************************************************************************
1127  *
1128  * FUNCTION:    acpi_os_delete_cache
1129  *
1130  * PARAMETERS:  Cache           - Handle to cache object
1131  *
1132  * RETURN:      Status
1133  *
1134  * DESCRIPTION: Free all objects within the requested cache and delete the
1135  *              cache object.
1136  *
1137  ******************************************************************************/
1138
1139 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1140 {
1141         kmem_cache_destroy(cache);
1142         return (AE_OK);
1143 }
1144
1145 /*******************************************************************************
1146  *
1147  * FUNCTION:    acpi_os_release_object
1148  *
1149  * PARAMETERS:  Cache       - Handle to cache object
1150  *              Object      - The object to be released
1151  *
1152  * RETURN:      None
1153  *
1154  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1155  *              the object is deleted.
1156  *
1157  ******************************************************************************/
1158
1159 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1160 {
1161         kmem_cache_free(cache, object);
1162         return (AE_OK);
1163 }
1164
1165 /******************************************************************************
1166  *
1167  * FUNCTION:    acpi_os_validate_interface
1168  *
1169  * PARAMETERS:  interface           - Requested interface to be validated
1170  *
1171  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1172  *
1173  * DESCRIPTION: Match an interface string to the interfaces supported by the
1174  *              host. Strings originate from an AML call to the _OSI method.
1175  *
1176  *****************************************************************************/
1177
1178 acpi_status
1179 acpi_os_validate_interface (char *interface)
1180 {
1181         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1182                 return AE_OK;
1183         if (!strcmp("Linux", interface)) {
1184                 printk(KERN_WARNING PREFIX
1185                         "System BIOS is requesting _OSI(Linux)\n");
1186 #ifdef  OSI_LINUX_ENABLED
1187                 printk(KERN_WARNING PREFIX
1188                         "Please test with \"acpi_osi=!Linux\"\n"
1189                         "Please send dmidecode "
1190                         "to linux-acpi@vger.kernel.org\n");
1191 #else
1192                 printk(KERN_WARNING PREFIX
1193                         "If \"acpi_osi=Linux\" works better,\n"
1194                         "Please send dmidecode "
1195                         "to linux-acpi@vger.kernel.org\n");
1196 #endif
1197                 if(osi_linux)
1198                         return AE_OK;
1199         }
1200         return AE_SUPPORT;
1201 }
1202
1203 /******************************************************************************
1204  *
1205  * FUNCTION:    acpi_os_validate_address
1206  *
1207  * PARAMETERS:  space_id             - ACPI space ID
1208  *              address             - Physical address
1209  *              length              - Address length
1210  *
1211  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1212  *              should return AE_AML_ILLEGAL_ADDRESS.
1213  *
1214  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1215  *              the addresses accessed by AML operation regions.
1216  *
1217  *****************************************************************************/
1218
1219 acpi_status
1220 acpi_os_validate_address (
1221     u8                   space_id,
1222     acpi_physical_address   address,
1223     acpi_size               length)
1224 {
1225
1226     return AE_OK;
1227 }
1228
1229 #ifdef CONFIG_DMI
1230 #ifdef  OSI_LINUX_ENABLED
1231 static int dmi_osi_not_linux(struct dmi_system_id *d)
1232 {
1233         printk(KERN_NOTICE "%s detected: requires not _OSI(Linux)\n", d->ident);
1234         enable_osi_linux(0);
1235         return 0;
1236 }
1237 #else
1238 static int dmi_osi_linux(struct dmi_system_id *d)
1239 {
1240         printk(KERN_NOTICE "%s detected: requires _OSI(Linux)\n", d->ident);
1241         enable_osi_linux(1);
1242         return 0;
1243 }
1244 #endif
1245
1246 static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {
1247 #ifdef  OSI_LINUX_ENABLED
1248         /*
1249          * Boxes that need NOT _OSI(Linux)
1250          */
1251         {
1252          .callback = dmi_osi_not_linux,
1253          .ident = "Toshiba Satellite P100",
1254          .matches = {
1255                      DMI_MATCH(DMI_BOARD_VENDOR, "TOSHIBA"),
1256                      DMI_MATCH(DMI_BOARD_NAME, "Satellite P100"),
1257                      },
1258          },
1259 #else
1260         /*
1261          * Boxes that need _OSI(Linux)
1262          */
1263         {
1264          .callback = dmi_osi_linux,
1265          .ident = "Intel Napa CRB",
1266          .matches = {
1267                      DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
1268                      DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),
1269                      },
1270          },
1271 #endif
1272         {}
1273 };
1274 #endif /* CONFIG_DMI */
1275
1276 #endif