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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/config.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/slab.h>
  32 #include <linux/mm.h>
  33 #include <linux/pci.h>
  34 #include <linux/smp_lock.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/kmod.h>
  37 #include <linux/delay.h>
  38 #include <linux/workqueue.h>
  39 #include <linux/nmi.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
  49 #define _COMPONENT              ACPI_OS_SERVICES
  50 ACPI_MODULE_NAME        ("osl")
  51
  52 #define PREFIX          "ACPI: "
  53
  54 struct acpi_os_dpc
  55 {
  56     acpi_osd_exec_callback  function;
  57     void                    *context;
  58 };
  59
  60 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  61 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  62 #endif
  63
  64 #ifdef ENABLE_DEBUGGER
  65 #include <linux/kdb.h>
  66
  67 /* stuff for debugger support */
  68 int acpi_in_debugger;
  69 EXPORT_SYMBOL(acpi_in_debugger);
  70
  71 extern char line_buf[80];
  72 #endif /*ENABLE_DEBUGGER*/
  73
  74 int acpi_specific_hotkey_enabled = TRUE;
  75 EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
  76
  77 static unsigned int acpi_irq_irq;
  78 static acpi_osd_handler acpi_irq_handler;
  79 static void *acpi_irq_context;
  80 static struct workqueue_struct *kacpid_wq;
  81
  82 acpi_status
  83 acpi_os_initialize(void)
  84 {
  85         return AE_OK;
  86 }
  87
  88 acpi_status
  89 acpi_os_initialize1(void)
  90 {
  91         /*
  92          * Initialize PCI configuration space access, as we'll need to access
  93          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
  94          */
  95 #ifdef CONFIG_ACPI_PCI
  96         if (!raw_pci_ops) {
  97                 printk(KERN_ERR PREFIX "Access to PCI configuration space unavailable\n");
  98                 return AE_NULL_ENTRY;
  99         }
 100 #endif
 101         kacpid_wq = create_singlethread_workqueue("kacpid");
 102         BUG_ON(!kacpid_wq);
 103
 104         return AE_OK;
 105 }
 106
 107 acpi_status
 108 acpi_os_terminate(void)
 109 {
 110         if (acpi_irq_handler) {
 111                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 112                                                  acpi_irq_handler);
 113         }
 114
 115         destroy_workqueue(kacpid_wq);
 116
 117         return AE_OK;
 118 }
 119
 120 void
 121 acpi_os_printf(const char *fmt,...)
 122 {
 123         va_list args;
 124         va_start(args, fmt);
 125         acpi_os_vprintf(fmt, args);
 126         va_end(args);
 127 }
 128 EXPORT_SYMBOL(acpi_os_printf);
 129
 130 void
 131 acpi_os_vprintf(const char *fmt, va_list args)
 132 {
 133         static char buffer[512];
 134
 135         vsprintf(buffer, fmt, args);
 136
 137 #ifdef ENABLE_DEBUGGER
 138         if (acpi_in_debugger) {
 139                 kdb_printf("%s", buffer);
 140         } else {
 141                 printk("%s", buffer);
 142         }
 143 #else
 144         printk("%s", buffer);
 145 #endif
 146 }
 147
 148 extern int acpi_in_resume;
 149 void *
 150 acpi_os_allocate(acpi_size size)
 151 {
 152         if (acpi_in_resume)
 153                 return kmalloc(size, GFP_ATOMIC);
 154         else
 155                 return kmalloc(size, GFP_KERNEL);
 156 }
 157
 158 void
 159 acpi_os_free(void *ptr)
 160 {
 161         kfree(ptr);
 162 }
 163 EXPORT_SYMBOL(acpi_os_free);
 164
 165 acpi_status
 166 acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
 167 {
 168         if (efi_enabled) {
 169                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
 170                 if (efi.acpi20)
 171                         addr->pointer.physical =
 172                                 (acpi_physical_address) virt_to_phys(efi.acpi20);
 173                 else if (efi.acpi)
 174                         addr->pointer.physical =
 175                                 (acpi_physical_address) virt_to_phys(efi.acpi);
 176                 else {
 177                         printk(KERN_ERR PREFIX "System description tables not found\n");
 178                         return AE_NOT_FOUND;
 179                 }
 180         } else {
 181                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
 182                         printk(KERN_ERR PREFIX "System description tables not found\n");
 183                         return AE_NOT_FOUND;
 184                 }
 185         }
 186
 187         return AE_OK;
 188 }
 189
 190 acpi_status
 191 acpi_os_map_memory(acpi_physical_address phys, acpi_size size, void __iomem **virt)
 192 {
 193         if (efi_enabled) {
 194                 if (EFI_MEMORY_WB & efi_mem_attributes(phys)) {
 195                         *virt = (void __iomem *) phys_to_virt(phys);
 196                 } else {
 197                         *virt = ioremap(phys, size);
 198                 }
 199         } else {
 200                 if (phys > ULONG_MAX) {
 201                         printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 202                         return AE_BAD_PARAMETER;
 203                 }
 204                 /*
 205                  * ioremap checks to ensure this is in reserved space
 206                  */
 207                 *virt = ioremap((unsigned long) phys, size);
 208         }
 209
 210         if (!*virt)
 211                 return AE_NO_MEMORY;
 212
 213         return AE_OK;
 214 }
 215
 216 void
 217 acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 218 {
 219         iounmap(virt);
 220 }
 221
 222 #ifdef ACPI_FUTURE_USAGE
 223 acpi_status
 224 acpi_os_get_physical_address(void *virt, acpi_physical_address *phys)
 225 {
 226         if(!phys || !virt)
 227                 return AE_BAD_PARAMETER;
 228
 229         *phys = virt_to_phys(virt);
 230
 231         return AE_OK;
 232 }
 233 #endif
 234
 235 #define ACPI_MAX_OVERRIDE_LEN 100
 236
 237 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 238
 239 acpi_status
 240 acpi_os_predefined_override (const struct acpi_predefined_names *init_val,
 241                              acpi_string *new_val)
 242 {
 243         if (!init_val || !new_val)
 244                 return AE_BAD_PARAMETER;
 245
 246         *new_val = NULL;
 247         if (!memcmp (init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 248                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 249                         acpi_os_name);
 250                 *new_val = acpi_os_name;
 251         }
 252
 253         return AE_OK;
 254 }
 255
 256 acpi_status
 257 acpi_os_table_override (struct acpi_table_header *existing_table,
 258                         struct acpi_table_header **new_table)
 259 {
 260         if (!existing_table || !new_table)
 261                 return AE_BAD_PARAMETER;
 262
 263 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 264         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 265                 *new_table = (struct acpi_table_header*)AmlCode;
 266         else
 267                 *new_table = NULL;
 268 #else
 269         *new_table = NULL;
 270 #endif
 271         return AE_OK;
 272 }
 273
 274 static irqreturn_t
 275 acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
 276 {
 277         return (*acpi_irq_handler)(acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 278 }
 279
 280 acpi_status
 281 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, void *context)
 282 {
 283         unsigned int irq;
 284
 285         /*
 286          * Ignore the GSI from the core, and use the value in our copy of the
 287          * FADT. It may not be the same if an interrupt source override exists
 288          * for the SCI.
 289          */
 290         gsi = acpi_fadt.sci_int;
 291         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 292                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 293                        gsi);
 294                 return AE_OK;
 295         }
 296
 297         acpi_irq_handler = handler;
 298         acpi_irq_context = context;
 299         if (request_irq(irq, acpi_irq, SA_SHIRQ, "acpi", acpi_irq)) {
 300                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 301                 return AE_NOT_ACQUIRED;
 302         }
 303         acpi_irq_irq = irq;
 304
 305         return AE_OK;
 306 }
 307
 308 acpi_status
 309 acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 310 {
 311         if (irq) {
 312                 free_irq(irq, acpi_irq);
 313                 acpi_irq_handler = NULL;
 314                 acpi_irq_irq = 0;
 315         }
 316
 317         return AE_OK;
 318 }
 319
 320 /*
 321  * Running in interpreter thread context, safe to sleep
 322  */
 323
 324 void
 325 acpi_os_sleep(acpi_integer ms)
 326 {
 327         current->state = TASK_INTERRUPTIBLE;
 328         schedule_timeout(((signed long) ms * HZ) / 1000);
 329 }
 330 EXPORT_SYMBOL(acpi_os_sleep);
 331
 332 void
 333 acpi_os_stall(u32 us)
 334 {
 335         while (us) {
 336                 u32 delay = 1000;
 337
 338                 if (delay > us)
 339                         delay = us;
 340                 udelay(delay);
 341                 touch_nmi_watchdog();
 342                 us -= delay;
 343         }
 344 }
 345 EXPORT_SYMBOL(acpi_os_stall);
 346
 347 /*
 348  * Support ACPI 3.0 AML Timer operand
 349  * Returns 64-bit free-running, monotonically increasing timer
 350  * with 100ns granularity
 351  */
 352 u64
 353 acpi_os_get_timer (void)
 354 {
 355         static u64 t;
 356
 357 #ifdef  CONFIG_HPET
 358         /* TBD: use HPET if available */
 359 #endif
 360
 361 #ifdef  CONFIG_X86_PM_TIMER
 362         /* TBD: default to PM timer if HPET was not available */
 363 #endif
 364         if (!t)
 365                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 366
 367         return ++t;
 368 }
 369
 370 acpi_status
 371 acpi_os_read_port(
 372         acpi_io_address port,
 373         u32             *value,
 374         u32             width)
 375 {
 376         u32 dummy;
 377
 378         if (!value)
 379                 value = &dummy;
 380
 381         switch (width)
 382         {
 383         case 8:
 384                 *(u8*)  value = inb(port);
 385                 break;
 386         case 16:
 387                 *(u16*) value = inw(port);
 388                 break;
 389         case 32:
 390                 *(u32*) value = inl(port);
 391                 break;
 392         default:
 393                 BUG();
 394         }
 395
 396         return AE_OK;
 397 }
 398 EXPORT_SYMBOL(acpi_os_read_port);
 399
 400 acpi_status
 401 acpi_os_write_port(
 402         acpi_io_address port,
 403         u32             value,
 404         u32             width)
 405 {
 406         switch (width)
 407         {
 408         case 8:
 409                 outb(value, port);
 410                 break;
 411         case 16:
 412                 outw(value, port);
 413                 break;
 414         case 32:
 415                 outl(value, port);
 416                 break;
 417         default:
 418                 BUG();
 419         }
 420
 421         return AE_OK;
 422 }
 423 EXPORT_SYMBOL(acpi_os_write_port);
 424
 425 acpi_status
 426 acpi_os_read_memory(
 427         acpi_physical_address   phys_addr,
 428         u32                     *value,
 429         u32                     width)
 430 {
 431         u32                     dummy;
 432         void __iomem            *virt_addr;
 433         int                     iomem = 0;
 434
 435         if (efi_enabled) {
 436                 if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
 437                         /* HACK ALERT! We can use readb/w/l on real memory too.. */
 438                         virt_addr = (void __iomem *) phys_to_virt(phys_addr);
 439                 } else {
 440                         iomem = 1;
 441                         virt_addr = ioremap(phys_addr, width);
 442                 }
 443         } else
 444                 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
 445         if (!value)
 446                 value = &dummy;
 447
 448         switch (width) {
 449         case 8:
 450                 *(u8*) value = readb(virt_addr);
 451                 break;
 452         case 16:
 453                 *(u16*) value = readw(virt_addr);
 454                 break;
 455         case 32:
 456                 *(u32*) value = readl(virt_addr);
 457                 break;
 458         default:
 459                 BUG();
 460         }
 461
 462         if (efi_enabled) {
 463                 if (iomem)
 464                         iounmap(virt_addr);
 465         }
 466
 467         return AE_OK;
 468 }
 469
 470 acpi_status
 471 acpi_os_write_memory(
 472         acpi_physical_address   phys_addr,
 473         u32                     value,
 474         u32                     width)
 475 {
 476         void __iomem            *virt_addr;
 477         int                     iomem = 0;
 478
 479         if (efi_enabled) {
 480                 if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
 481                         /* HACK ALERT! We can use writeb/w/l on real memory too */
 482                         virt_addr = (void __iomem *) phys_to_virt(phys_addr);
 483                 } else {
 484                         iomem = 1;
 485                         virt_addr = ioremap(phys_addr, width);
 486                 }
 487         } else
 488                 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
 489
 490         switch (width) {
 491         case 8:
 492                 writeb(value, virt_addr);
 493                 break;
 494         case 16:
 495                 writew(value, virt_addr);
 496                 break;
 497         case 32:
 498                 writel(value, virt_addr);
 499                 break;
 500         default:
 501                 BUG();
 502         }
 503
 504         if (iomem)
 505                 iounmap(virt_addr);
 506
 507         return AE_OK;
 508 }
 509
 510 #ifdef CONFIG_ACPI_PCI
 511
 512 acpi_status
 513 acpi_os_read_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, void *value, u32 width)
 514 {
 515         int result, size;
 516
 517         if (!value)
 518                 return AE_BAD_PARAMETER;
 519
 520         switch (width) {
 521         case 8:
 522                 size = 1;
 523                 break;
 524         case 16:
 525                 size = 2;
 526                 break;
 527         case 32:
 528                 size = 4;
 529                 break;
 530         default:
 531                 return AE_ERROR;
 532         }
 533
 534         BUG_ON(!raw_pci_ops);
 535
 536         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 537                                 PCI_DEVFN(pci_id->device, pci_id->function),
 538                                 reg, size, value);
 539
 540         return (result ? AE_ERROR : AE_OK);
 541 }
 542 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 543
 544 acpi_status
 545 acpi_os_write_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, acpi_integer value, u32 width)
 546 {
 547         int result, size;
 548
 549         switch (width) {
 550         case 8:
 551                 size = 1;
 552                 break;
 553         case 16:
 554                 size = 2;
 555                 break;
 556         case 32:
 557                 size = 4;
 558                 break;
 559         default:
 560                 return AE_ERROR;
 561         }
 562
 563         BUG_ON(!raw_pci_ops);
 564
 565         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 566                                 PCI_DEVFN(pci_id->device, pci_id->function),
 567                                 reg, size, value);
 568
 569         return (result ? AE_ERROR : AE_OK);
 570 }
 571
 572 /* TODO: Change code to take advantage of driver model more */
 573 static void
 574 acpi_os_derive_pci_id_2 (
 575         acpi_handle             rhandle,        /* upper bound  */
 576         acpi_handle             chandle,        /* current node */
 577         struct acpi_pci_id      **id,
 578         int                     *is_bridge,
 579         u8                      *bus_number)
 580 {
 581         acpi_handle             handle;
 582         struct acpi_pci_id      *pci_id = *id;
 583         acpi_status             status;
 584         unsigned long           temp;
 585         acpi_object_type        type;
 586         u8                      tu8;
 587
 588         acpi_get_parent(chandle, &handle);
 589         if (handle != rhandle) {
 590                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge, bus_number);
 591
 592                 status = acpi_get_type(handle, &type);
 593                 if ( (ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE) )
 594                         return;
 595
 596                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &temp);
 597                 if (ACPI_SUCCESS(status)) {
 598                         pci_id->device  = ACPI_HIWORD (ACPI_LODWORD (temp));
 599                         pci_id->function = ACPI_LOWORD (ACPI_LODWORD (temp));
 600
 601                         if (*is_bridge)
 602                                 pci_id->bus = *bus_number;
 603
 604                         /* any nicer way to get bus number of bridge ? */
 605                         status = acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8, 8);
 606                         if (ACPI_SUCCESS(status) &&
 607                             ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 608                                 status = acpi_os_read_pci_configuration(pci_id, 0x18, &tu8, 8);
 609                                 if (!ACPI_SUCCESS(status)) {
 610                                         /* Certainly broken...  FIX ME */
 611                                         return;
 612                                 }
 613                                 *is_bridge = 1;
 614                                 pci_id->bus = tu8;
 615                                 status = acpi_os_read_pci_configuration(pci_id, 0x19, &tu8, 8);
 616                                 if (ACPI_SUCCESS(status)) {
 617                                         *bus_number = tu8;
 618                                 }
 619                         } else
 620                                 *is_bridge = 0;
 621                 }
 622         }
 623 }
 624
 625 void
 626 acpi_os_derive_pci_id (
 627         acpi_handle             rhandle,        /* upper bound  */
 628         acpi_handle             chandle,        /* current node */
 629         struct acpi_pci_id      **id)
 630 {
 631         int is_bridge = 1;
 632         u8 bus_number = (*id)->bus;
 633
 634         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 635 }
 636
 637 #else /*!CONFIG_ACPI_PCI*/
 638
 639 acpi_status
 640 acpi_os_write_pci_configuration (
 641         struct acpi_pci_id      *pci_id,
 642         u32                     reg,
 643         acpi_integer            value,
 644         u32                     width)
 645 {
 646         return AE_SUPPORT;
 647 }
 648
 649 acpi_status
 650 acpi_os_read_pci_configuration (
 651         struct acpi_pci_id      *pci_id,
 652         u32                     reg,
 653         void                    *value,
 654         u32                     width)
 655 {
 656         return AE_SUPPORT;
 657 }
 658
 659 void
 660 acpi_os_derive_pci_id (
 661         acpi_handle             rhandle,        /* upper bound  */
 662         acpi_handle             chandle,        /* current node */
 663         struct acpi_pci_id      **id)
 664 {
 665 }
 666
 667 #endif /*CONFIG_ACPI_PCI*/
 668
 669 static void
 670 acpi_os_execute_deferred (
 671         void *context)
 672 {
 673         struct acpi_os_dpc      *dpc = NULL;
 674
 675         ACPI_FUNCTION_TRACE ("os_execute_deferred");
 676
 677         dpc = (struct acpi_os_dpc *) context;
 678         if (!dpc) {
 679                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 680                 return_VOID;
 681         }
 682
 683         dpc->function(dpc->context);
 684
 685         kfree(dpc);
 686
 687         return_VOID;
 688 }
 689
 690 acpi_status
 691 acpi_os_queue_for_execution(
 692         u32                     priority,
 693         acpi_osd_exec_callback  function,
 694         void                    *context)
 695 {
 696         acpi_status             status = AE_OK;
 697         struct acpi_os_dpc      *dpc;
 698         struct work_struct      *task;
 699
 700         ACPI_FUNCTION_TRACE ("os_queue_for_execution");
 701
 702         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Scheduling function [%p(%p)] for deferred execution.\n", function, context));
 703
 704         if (!function)
 705                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 706
 707         /*
 708          * Allocate/initialize DPC structure.  Note that this memory will be
 709          * freed by the callee.  The kernel handles the tq_struct list  in a
 710          * way that allows us to also free its memory inside the callee.
 711          * Because we may want to schedule several tasks with different
 712          * parameters we can't use the approach some kernel code uses of
 713          * having a static tq_struct.
 714          * We can save time and code by allocating the DPC and tq_structs
 715          * from the same memory.
 716          */
 717
 718         dpc = kmalloc(sizeof(struct acpi_os_dpc)+sizeof(struct work_struct), GFP_ATOMIC);
 719         if (!dpc)
 720                 return_ACPI_STATUS (AE_NO_MEMORY);
 721
 722         dpc->function = function;
 723         dpc->context = context;
 724
 725         task = (void *)(dpc+1);
 726         INIT_WORK(task, acpi_os_execute_deferred, (void*)dpc);
 727
 728         if (!queue_work(kacpid_wq, task)) {
 729                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Call to queue_work() failed.\n"));
 730                 kfree(dpc);
 731                 status = AE_ERROR;
 732         }
 733
 734         return_ACPI_STATUS (status);
 735 }
 736 EXPORT_SYMBOL(acpi_os_queue_for_execution);
 737
 738 void
 739 acpi_os_wait_events_complete(
 740         void *context)
 741 {
 742         flush_workqueue(kacpid_wq);
 743 }
 744 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 745
 746 /*
 747  * Allocate the memory for a spinlock and initialize it.
 748  */
 749 acpi_status
 750 acpi_os_create_lock (
 751         acpi_handle     *out_handle)
 752 {
 753         spinlock_t *lock_ptr;
 754
 755         ACPI_FUNCTION_TRACE ("os_create_lock");
 756
 757         lock_ptr = acpi_os_allocate(sizeof(spinlock_t));
 758
 759         spin_lock_init(lock_ptr);
 760
 761         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));
 762
 763         *out_handle = lock_ptr;
 764
 765         return_ACPI_STATUS (AE_OK);
 766 }
 767
 768
 769 /*
 770  * Deallocate the memory for a spinlock.
 771  */
 772 void
 773 acpi_os_delete_lock (
 774         acpi_handle     handle)
 775 {
 776         ACPI_FUNCTION_TRACE ("os_create_lock");
 777
 778         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));
 779
 780         acpi_os_free(handle);
 781
 782         return_VOID;
 783 }
 784
 785 /*
 786  * Acquire a spinlock.
 787  *
 788  * handle is a pointer to the spinlock_t.
 789  * flags is *not* the result of save_flags - it is an ACPI-specific flag variable
 790  *   that indicates whether we are at interrupt level.
 791  */
 792 void
 793 acpi_os_acquire_lock (
 794         acpi_handle     handle,
 795         u32             flags)
 796 {
 797         ACPI_FUNCTION_TRACE ("os_acquire_lock");
 798
 799         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquiring spinlock[%p] from %s level\n", handle,
 800                 ((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
 801
 802         if (flags & ACPI_NOT_ISR)
 803                 ACPI_DISABLE_IRQS();
 804
 805         spin_lock((spinlock_t *)handle);
 806
 807         return_VOID;
 808 }
 809
 810
 811 /*
 812  * Release a spinlock. See above.
 813  */
 814 void
 815 acpi_os_release_lock (
 816         acpi_handle     handle,
 817         u32             flags)
 818 {
 819         ACPI_FUNCTION_TRACE ("os_release_lock");
 820
 821         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Releasing spinlock[%p] from %s level\n", handle,
 822                 ((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
 823
 824         spin_unlock((spinlock_t *)handle);
 825
 826         if (flags & ACPI_NOT_ISR)
 827                 ACPI_ENABLE_IRQS();
 828
 829         return_VOID;
 830 }
 831
 832
 833 acpi_status
 834 acpi_os_create_semaphore(
 835         u32             max_units,
 836         u32             initial_units,
 837         acpi_handle     *handle)
 838 {
 839         struct semaphore        *sem = NULL;
 840
 841         ACPI_FUNCTION_TRACE ("os_create_semaphore");
 842
 843         sem = acpi_os_allocate(sizeof(struct semaphore));
 844         if (!sem)
 845                 return_ACPI_STATUS (AE_NO_MEMORY);
 846         memset(sem, 0, sizeof(struct semaphore));
 847
 848         sema_init(sem, initial_units);
 849
 850         *handle = (acpi_handle*)sem;
 851
 852         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", *handle, initial_units));
 853
 854         return_ACPI_STATUS (AE_OK);
 855 }
 856 EXPORT_SYMBOL(acpi_os_create_semaphore);
 857
 858
 859 /*
 860  * TODO: A better way to delete semaphores?  Linux doesn't have a
 861  * 'delete_semaphore()' function -- may result in an invalid
 862  * pointer dereference for non-synchronized consumers.  Should
 863  * we at least check for blocked threads and signal/cancel them?
 864  */
 865
 866 acpi_status
 867 acpi_os_delete_semaphore(
 868         acpi_handle     handle)
 869 {
 870         struct semaphore *sem = (struct semaphore*) handle;
 871
 872         ACPI_FUNCTION_TRACE ("os_delete_semaphore");
 873
 874         if (!sem)
 875                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 876
 877         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 878
 879         acpi_os_free(sem); sem =  NULL;
 880
 881         return_ACPI_STATUS (AE_OK);
 882 }
 883 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 884
 885
 886 /*
 887  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 888  * improvise.  The process is to sleep for one scheduler quantum
 889  * until the semaphore becomes available.  Downside is that this
 890  * may result in starvation for timeout-based waits when there's
 891  * lots of semaphore activity.
 892  *
 893  * TODO: Support for units > 1?
 894  */
 895 acpi_status
 896 acpi_os_wait_semaphore(
 897         acpi_handle             handle,
 898         u32                     units,
 899         u16                     timeout)
 900 {
 901         acpi_status             status = AE_OK;
 902         struct semaphore        *sem = (struct semaphore*)handle;
 903         int                     ret = 0;
 904
 905         ACPI_FUNCTION_TRACE ("os_wait_semaphore");
 906
 907         if (!sem || (units < 1))
 908                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 909
 910         if (units > 1)
 911                 return_ACPI_STATUS (AE_SUPPORT);
 912
 913         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", handle, units, timeout));
 914
 915         if (in_atomic())
 916                 timeout = 0;
 917
 918         switch (timeout)
 919         {
 920                 /*
 921                  * No Wait:
 922                  * --------
 923                  * A zero timeout value indicates that we shouldn't wait - just
 924                  * acquire the semaphore if available otherwise return AE_TIME
 925                  * (a.k.a. 'would block').
 926                  */
 927                 case 0:
 928                 if(down_trylock(sem))
 929                         status = AE_TIME;
 930                 break;
 931
 932                 /*
 933                  * Wait Indefinitely:
 934                  * ------------------
 935                  */
 936                 case ACPI_WAIT_FOREVER:
 937                 down(sem);
 938                 break;
 939
 940                 /*
 941                  * Wait w/ Timeout:
 942                  * ----------------
 943                  */
 944                 default:
 945                 // TODO: A better timeout algorithm?
 946                 {
 947                         int i = 0;
 948                         static const int quantum_ms = 1000/HZ;
 949
 950                         ret = down_trylock(sem);
 951                         for (i = timeout; (i > 0 && ret < 0); i -= quantum_ms) {
 952                                 current->state = TASK_INTERRUPTIBLE;
 953                                 schedule_timeout(1);
 954                                 ret = down_trylock(sem);
 955                         }
 956
 957                         if (ret != 0)
 958                                 status = AE_TIME;
 959                 }
 960                 break;
 961         }
 962
 963         if (ACPI_FAILURE(status)) {
 964                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Failed to acquire semaphore[%p|%d|%d], %s\n",
 965                         handle, units, timeout, acpi_format_exception(status)));
 966         }
 967         else {
 968                 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquired semaphore[%p|%d|%d]\n", handle, units, timeout));
 969         }
 970
 971         return_ACPI_STATUS (status);
 972 }
 973 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 974
 975
 976 /*
 977  * TODO: Support for units > 1?
 978  */
 979 acpi_status
 980 acpi_os_signal_semaphore(
 981     acpi_handle             handle,
 982     u32                     units)
 983 {
 984         struct semaphore *sem = (struct semaphore *) handle;
 985
 986         ACPI_FUNCTION_TRACE ("os_signal_semaphore");
 987
 988         if (!sem || (units < 1))
 989                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 990
 991         if (units > 1)
 992                 return_ACPI_STATUS (AE_SUPPORT);
 993
 994         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, units));
 995
 996         up(sem);
 997
 998         return_ACPI_STATUS (AE_OK);
 999 }
1000 EXPORT_SYMBOL(acpi_os_signal_semaphore);
1001
1002 #ifdef ACPI_FUTURE_USAGE
1003 u32
1004 acpi_os_get_line(char *buffer)
1005 {
1006
1007 #ifdef ENABLE_DEBUGGER
1008         if (acpi_in_debugger) {
1009                 u32 chars;
1010
1011                 kdb_read(buffer, sizeof(line_buf));
1012
1013                 /* remove the CR kdb includes */
1014                 chars = strlen(buffer) - 1;
1015                 buffer[chars] = '\0';
1016         }
1017 #endif
1018
1019         return 0;
1020 }
1021 #endif  /*  ACPI_FUTURE_USAGE  */
1022
1023 /* Assumes no unreadable holes inbetween */
1024 u8
1025 acpi_os_readable(void *ptr, acpi_size len)
1026 {
1027 #if defined(__i386__) || defined(__x86_64__)
1028         char tmp;
1029         return !__get_user(tmp, (char __user *)ptr) && !__get_user(tmp, (char __user *)ptr + len - 1);
1030 #endif
1031         return 1;
1032 }
1033
1034 #ifdef ACPI_FUTURE_USAGE
1035 u8
1036 acpi_os_writable(void *ptr, acpi_size len)
1037 {
1038         /* could do dummy write (racy) or a kernel page table lookup.
1039            The later may be difficult at early boot when kmap doesn't work yet. */
1040         return 1;
1041 }
1042 #endif
1043
1044 u32
1045 acpi_os_get_thread_id (void)
1046 {
1047         if (!in_atomic())
1048                 return current->pid;
1049
1050         return 0;
1051 }
1052
1053 acpi_status
1054 acpi_os_signal (
1055     u32         function,
1056     void        *info)
1057 {
1058         switch (function)
1059         {
1060         case ACPI_SIGNAL_FATAL:
1061                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1062                 break;
1063         case ACPI_SIGNAL_BREAKPOINT:
1064                 /*
1065                  * AML Breakpoint
1066                  * ACPI spec. says to treat it as a NOP unless
1067                  * you are debugging.  So if/when we integrate
1068                  * AML debugger into the kernel debugger its
1069                  * hook will go here.  But until then it is
1070                  * not useful to print anything on breakpoints.
1071                  */
1072                 break;
1073         default:
1074                 break;
1075         }
1076
1077         return AE_OK;
1078 }
1079 EXPORT_SYMBOL(acpi_os_signal);
1080
1081 static int __init
1082 acpi_os_name_setup(char *str)
1083 {
1084         char *p = acpi_os_name;
1085         int count = ACPI_MAX_OVERRIDE_LEN-1;
1086
1087         if (!str || !*str)
1088                 return 0;
1089
1090         for (; count-- && str && *str; str++) {
1091                 if (isalnum(*str) || *str == ' ' || *str == ':')
1092                         *p++ = *str;
1093                 else if (*str == '\'' || *str == '"')
1094                         continue;
1095                 else
1096                         break;
1097         }
1098         *p = 0;
1099
1100         return 1;
1101
1102 }
1103
1104 __setup("acpi_os_name=", acpi_os_name_setup);
1105
1106 /*
1107  * _OSI control
1108  * empty string disables _OSI
1109  * TBD additional string adds to _OSI
1110  */
1111 static int __init
1112 acpi_osi_setup(char *str)
1113 {
1114         if (str == NULL || *str == '\0') {
1115                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1116                 acpi_gbl_create_osi_method = FALSE;
1117         } else
1118         {
1119                 /* TBD */
1120                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n", str);
1121         }
1122
1123         return 1;
1124 }
1125
1126 __setup("acpi_osi=", acpi_osi_setup);
1127
1128 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1129 static int __init
1130 acpi_serialize_setup(char *str)
1131 {
1132         printk(KERN_INFO PREFIX "serialize enabled\n");
1133
1134         acpi_gbl_all_methods_serialized = TRUE;
1135
1136         return 1;
1137 }
1138
1139 __setup("acpi_serialize", acpi_serialize_setup);
1140
1141 /*
1142  * Wake and Run-Time GPES are expected to be separate.
1143  * We disable wake-GPEs at run-time to prevent spurious
1144  * interrupts.
1145  *
1146  * However, if a system exists that shares Wake and
1147  * Run-time events on the same GPE this flag is available
1148  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1149  */
1150 static int __init
1151 acpi_wake_gpes_always_on_setup(char *str)
1152 {
1153         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1154
1155         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1156
1157         return 1;
1158 }
1159
1160 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1161
1162 int __init
1163 acpi_hotkey_setup(char *str)
1164 {
1165         acpi_specific_hotkey_enabled = FALSE;
1166         return 1;
1167 }
1168
1169 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
1170
1171 /*
1172  * max_cstate is defined in the base kernel so modules can
1173  * change it w/o depending on the state of the processor module.
1174  */
1175 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1176
1177
1178 EXPORT_SYMBOL(max_cstate);