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