drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  *
  26  */
  27
  28 #include <linux/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 <linux/kthread.h>
  41 #include <acpi/acpi.h>
  42 #include <asm/io.h>
  43 #include <acpi/acpi_bus.h>
  44 #include <acpi/processor.h>
  45 #include <asm/uaccess.h>
  46
  47 #include <linux/efi.h>
  48
  49 #define _COMPONENT              ACPI_OS_SERVICES
  50 ACPI_MODULE_NAME("osl")
  51 #define PREFIX          "ACPI: "
  52 struct acpi_os_dpc {
  53         acpi_osd_exec_callback function;
  54         void *context;
  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 int acpi_specific_hotkey_enabled = TRUE;
  72 EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
  73
  74 static unsigned int acpi_irq_irq;
  75 static acpi_osd_handler acpi_irq_handler;
  76 static void *acpi_irq_context;
  77 static struct workqueue_struct *kacpid_wq;
  78
  79 acpi_status acpi_os_initialize(void)
  80 {
  81         return AE_OK;
  82 }
  83
  84 acpi_status acpi_os_initialize1(void)
  85 {
  86         /*
  87          * Initialize PCI configuration space access, as we'll need to access
  88          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
  89          */
  90         if (!raw_pci_ops) {
  91                 printk(KERN_ERR PREFIX
  92                        "Access to PCI configuration space unavailable\n");
  93                 return AE_NULL_ENTRY;
  94         }
  95         kacpid_wq = create_singlethread_workqueue("kacpid");
  96         BUG_ON(!kacpid_wq);
  97
  98         return AE_OK;
  99 }
 100
 101 acpi_status acpi_os_terminate(void)
 102 {
 103         if (acpi_irq_handler) {
 104                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 105                                                  acpi_irq_handler);
 106         }
 107
 108         destroy_workqueue(kacpid_wq);
 109
 110         return AE_OK;
 111 }
 112
 113 void acpi_os_printf(const char *fmt, ...)
 114 {
 115         va_list args;
 116         va_start(args, fmt);
 117         acpi_os_vprintf(fmt, args);
 118         va_end(args);
 119 }
 120
 121 EXPORT_SYMBOL(acpi_os_printf);
 122
 123 void acpi_os_vprintf(const char *fmt, va_list args)
 124 {
 125         static char buffer[512];
 126
 127         vsprintf(buffer, fmt, args);
 128
 129 #ifdef ENABLE_DEBUGGER
 130         if (acpi_in_debugger) {
 131                 kdb_printf("%s", buffer);
 132         } else {
 133                 printk("%s", buffer);
 134         }
 135 #else
 136         printk("%s", buffer);
 137 #endif
 138 }
 139
 140
 141 extern int acpi_in_resume;
 142 void *acpi_os_allocate(acpi_size size)
 143 {
 144         if (acpi_in_resume)
 145                 return kmalloc(size, GFP_ATOMIC);
 146         else
 147                 return kmalloc(size, GFP_KERNEL);
 148 }
 149
 150 void acpi_os_free(void *ptr)
 151 {
 152         kfree(ptr);
 153 }
 154
 155 EXPORT_SYMBOL(acpi_os_free);
 156
 157 acpi_status acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
 158 {
 159         if (efi_enabled) {
 160                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
 161                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 162                         addr->pointer.physical = efi.acpi20;
 163                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 164                         addr->pointer.physical = efi.acpi;
 165                 else {
 166                         printk(KERN_ERR PREFIX
 167                                "System description tables not found\n");
 168                         return AE_NOT_FOUND;
 169                 }
 170         } else {
 171                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
 172                         printk(KERN_ERR PREFIX
 173                                "System description tables not found\n");
 174                         return AE_NOT_FOUND;
 175                 }
 176         }
 177
 178         return AE_OK;
 179 }
 180
 181 acpi_status
 182 acpi_os_map_memory(acpi_physical_address phys, acpi_size size,
 183                    void __iomem ** virt)
 184 {
 185         if (phys > ULONG_MAX) {
 186                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 187                 return AE_BAD_PARAMETER;
 188         }
 189         /*
 190          * ioremap checks to ensure this is in reserved space
 191          */
 192         *virt = ioremap((unsigned long)phys, size);
 193
 194         if (!*virt)
 195                 return AE_NO_MEMORY;
 196
 197         return AE_OK;
 198 }
 199 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 200
 201 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 202 {
 203         iounmap(virt);
 204 }
 205 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 206
 207 #ifdef ACPI_FUTURE_USAGE
 208 acpi_status
 209 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 210 {
 211         if (!phys || !virt)
 212                 return AE_BAD_PARAMETER;
 213
 214         *phys = virt_to_phys(virt);
 215
 216         return AE_OK;
 217 }
 218 #endif
 219
 220 #define ACPI_MAX_OVERRIDE_LEN 100
 221
 222 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 223
 224 acpi_status
 225 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 226                             acpi_string * new_val)
 227 {
 228         if (!init_val || !new_val)
 229                 return AE_BAD_PARAMETER;
 230
 231         *new_val = NULL;
 232         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 233                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 234                        acpi_os_name);
 235                 *new_val = acpi_os_name;
 236         }
 237
 238         return AE_OK;
 239 }
 240
 241 acpi_status
 242 acpi_os_table_override(struct acpi_table_header * existing_table,
 243                        struct acpi_table_header ** new_table)
 244 {
 245         if (!existing_table || !new_table)
 246                 return AE_BAD_PARAMETER;
 247
 248 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 249         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 250                 *new_table = (struct acpi_table_header *)AmlCode;
 251         else
 252                 *new_table = NULL;
 253 #else
 254         *new_table = NULL;
 255 #endif
 256         return AE_OK;
 257 }
 258
 259 static irqreturn_t acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
 260 {
 261         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 262 }
 263
 264 acpi_status
 265 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 266                                   void *context)
 267 {
 268         unsigned int irq;
 269
 270         /*
 271          * Ignore the GSI from the core, and use the value in our copy of the
 272          * FADT. It may not be the same if an interrupt source override exists
 273          * for the SCI.
 274          */
 275         gsi = acpi_fadt.sci_int;
 276         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 277                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 278                        gsi);
 279                 return AE_OK;
 280         }
 281
 282         acpi_irq_handler = handler;
 283         acpi_irq_context = context;
 284         if (request_irq(irq, acpi_irq, SA_SHIRQ, "acpi", acpi_irq)) {
 285                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 286                 return AE_NOT_ACQUIRED;
 287         }
 288         acpi_irq_irq = irq;
 289
 290         return AE_OK;
 291 }
 292
 293 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 294 {
 295         if (irq) {
 296                 free_irq(irq, acpi_irq);
 297                 acpi_irq_handler = NULL;
 298                 acpi_irq_irq = 0;
 299         }
 300
 301         return AE_OK;
 302 }
 303
 304 /*
 305  * Running in interpreter thread context, safe to sleep
 306  */
 307
 308 void acpi_os_sleep(acpi_integer ms)
 309 {
 310         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 311 }
 312
 313 EXPORT_SYMBOL(acpi_os_sleep);
 314
 315 void acpi_os_stall(u32 us)
 316 {
 317         while (us) {
 318                 u32 delay = 1000;
 319
 320                 if (delay > us)
 321                         delay = us;
 322                 udelay(delay);
 323                 touch_nmi_watchdog();
 324                 us -= delay;
 325         }
 326 }
 327
 328 EXPORT_SYMBOL(acpi_os_stall);
 329
 330 /*
 331  * Support ACPI 3.0 AML Timer operand
 332  * Returns 64-bit free-running, monotonically increasing timer
 333  * with 100ns granularity
 334  */
 335 u64 acpi_os_get_timer(void)
 336 {
 337         static u64 t;
 338
 339 #ifdef  CONFIG_HPET
 340         /* TBD: use HPET if available */
 341 #endif
 342
 343 #ifdef  CONFIG_X86_PM_TIMER
 344         /* TBD: default to PM timer if HPET was not available */
 345 #endif
 346         if (!t)
 347                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 348
 349         return ++t;
 350 }
 351
 352 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 353 {
 354         u32 dummy;
 355
 356         if (!value)
 357                 value = &dummy;
 358
 359         switch (width) {
 360         case 8:
 361                 *(u8 *) value = inb(port);
 362                 break;
 363         case 16:
 364                 *(u16 *) value = inw(port);
 365                 break;
 366         case 32:
 367                 *(u32 *) value = inl(port);
 368                 break;
 369         default:
 370                 BUG();
 371         }
 372
 373         return AE_OK;
 374 }
 375
 376 EXPORT_SYMBOL(acpi_os_read_port);
 377
 378 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 379 {
 380         switch (width) {
 381         case 8:
 382                 outb(value, port);
 383                 break;
 384         case 16:
 385                 outw(value, port);
 386                 break;
 387         case 32:
 388                 outl(value, port);
 389                 break;
 390         default:
 391                 BUG();
 392         }
 393
 394         return AE_OK;
 395 }
 396
 397 EXPORT_SYMBOL(acpi_os_write_port);
 398
 399 acpi_status
 400 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 401 {
 402         u32 dummy;
 403         void __iomem *virt_addr;
 404
 405         virt_addr = ioremap(phys_addr, width);
 406         if (!value)
 407                 value = &dummy;
 408
 409         switch (width) {
 410         case 8:
 411                 *(u8 *) value = readb(virt_addr);
 412                 break;
 413         case 16:
 414                 *(u16 *) value = readw(virt_addr);
 415                 break;
 416         case 32:
 417                 *(u32 *) value = readl(virt_addr);
 418                 break;
 419         default:
 420                 BUG();
 421         }
 422
 423         iounmap(virt_addr);
 424
 425         return AE_OK;
 426 }
 427
 428 acpi_status
 429 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 430 {
 431         void __iomem *virt_addr;
 432
 433         virt_addr = ioremap(phys_addr, width);
 434
 435         switch (width) {
 436         case 8:
 437                 writeb(value, virt_addr);
 438                 break;
 439         case 16:
 440                 writew(value, virt_addr);
 441                 break;
 442         case 32:
 443                 writel(value, virt_addr);
 444                 break;
 445         default:
 446                 BUG();
 447         }
 448
 449         iounmap(virt_addr);
 450
 451         return AE_OK;
 452 }
 453
 454 acpi_status
 455 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 456                                void *value, u32 width)
 457 {
 458         int result, size;
 459
 460         if (!value)
 461                 return AE_BAD_PARAMETER;
 462
 463         switch (width) {
 464         case 8:
 465                 size = 1;
 466                 break;
 467         case 16:
 468                 size = 2;
 469                 break;
 470         case 32:
 471                 size = 4;
 472                 break;
 473         default:
 474                 return AE_ERROR;
 475         }
 476
 477         BUG_ON(!raw_pci_ops);
 478
 479         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 480                                    PCI_DEVFN(pci_id->device, pci_id->function),
 481                                    reg, size, value);
 482
 483         return (result ? AE_ERROR : AE_OK);
 484 }
 485
 486 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 487
 488 acpi_status
 489 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 490                                 acpi_integer value, u32 width)
 491 {
 492         int result, size;
 493
 494         switch (width) {
 495         case 8:
 496                 size = 1;
 497                 break;
 498         case 16:
 499                 size = 2;
 500                 break;
 501         case 32:
 502                 size = 4;
 503                 break;
 504         default:
 505                 return AE_ERROR;
 506         }
 507
 508         BUG_ON(!raw_pci_ops);
 509
 510         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 511                                     PCI_DEVFN(pci_id->device, pci_id->function),
 512                                     reg, size, value);
 513
 514         return (result ? AE_ERROR : AE_OK);
 515 }
 516
 517 /* TODO: Change code to take advantage of driver model more */
 518 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 519                                     acpi_handle chandle,        /* current node */
 520                                     struct acpi_pci_id **id,
 521                                     int *is_bridge, u8 * bus_number)
 522 {
 523         acpi_handle handle;
 524         struct acpi_pci_id *pci_id = *id;
 525         acpi_status status;
 526         unsigned long temp;
 527         acpi_object_type type;
 528         u8 tu8;
 529
 530         acpi_get_parent(chandle, &handle);
 531         if (handle != rhandle) {
 532                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 533                                         bus_number);
 534
 535                 status = acpi_get_type(handle, &type);
 536                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 537                         return;
 538
 539                 status =
 540                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 541                                           &temp);
 542                 if (ACPI_SUCCESS(status)) {
 543                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 544                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 545
 546                         if (*is_bridge)
 547                                 pci_id->bus = *bus_number;
 548
 549                         /* any nicer way to get bus number of bridge ? */
 550                         status =
 551                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 552                                                            8);
 553                         if (ACPI_SUCCESS(status)
 554                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 555                                 status =
 556                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 557                                                                    &tu8, 8);
 558                                 if (!ACPI_SUCCESS(status)) {
 559                                         /* Certainly broken...  FIX ME */
 560                                         return;
 561                                 }
 562                                 *is_bridge = 1;
 563                                 pci_id->bus = tu8;
 564                                 status =
 565                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 566                                                                    &tu8, 8);
 567                                 if (ACPI_SUCCESS(status)) {
 568                                         *bus_number = tu8;
 569                                 }
 570                         } else
 571                                 *is_bridge = 0;
 572                 }
 573         }
 574 }
 575
 576 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 577                            acpi_handle chandle, /* current node */
 578                            struct acpi_pci_id **id)
 579 {
 580         int is_bridge = 1;
 581         u8 bus_number = (*id)->bus;
 582
 583         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 584 }
 585
 586 static void acpi_os_execute_deferred(void *context)
 587 {
 588         struct acpi_os_dpc *dpc = NULL;
 589
 590         ACPI_FUNCTION_TRACE("os_execute_deferred");
 591
 592         dpc = (struct acpi_os_dpc *)context;
 593         if (!dpc) {
 594                 ACPI_ERROR((AE_INFO, "Invalid (NULL) context"));
 595                 return_VOID;
 596         }
 597
 598         dpc->function(dpc->context);
 599
 600         kfree(dpc);
 601
 602         return_VOID;
 603 }
 604
 605 static int acpi_os_execute_thread(void *context)
 606 {
 607         struct acpi_os_dpc *dpc = (struct acpi_os_dpc *)context;
 608         if (dpc) {
 609                 dpc->function(dpc->context);
 610                 kfree(dpc);
 611         }
 612         do_exit(0);
 613 }
 614
 615 /*******************************************************************************
 616  *
 617  * FUNCTION:    acpi_os_execute
 618  *
 619  * PARAMETERS:  Type               - Type of the callback
 620  *              Function           - Function to be executed
 621  *              Context            - Function parameters
 622  *
 623  * RETURN:      Status
 624  *
 625  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 626  *              immediately executes function on a separate thread.
 627  *
 628  ******************************************************************************/
 629
 630 acpi_status acpi_os_execute(acpi_execute_type type,
 631                             acpi_osd_exec_callback function, void *context)
 632 {
 633         acpi_status status = AE_OK;
 634         struct acpi_os_dpc *dpc;
 635         struct work_struct *task;
 636         struct task_struct *p;
 637
 638         if (!function)
 639                 return AE_BAD_PARAMETER;
 640         /*
 641          * Allocate/initialize DPC structure.  Note that this memory will be
 642          * freed by the callee.  The kernel handles the tq_struct list  in a
 643          * way that allows us to also free its memory inside the callee.
 644          * Because we may want to schedule several tasks with different
 645          * parameters we can't use the approach some kernel code uses of
 646          * having a static tq_struct.
 647          * We can save time and code by allocating the DPC and tq_structs
 648          * from the same memory.
 649          */
 650         if (type == OSL_NOTIFY_HANDLER) {
 651                 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_KERNEL);
 652         } else {
 653                 dpc = kmalloc(sizeof(struct acpi_os_dpc) +
 654                                 sizeof(struct work_struct), GFP_ATOMIC);
 655         }
 656         if (!dpc)
 657                 return AE_NO_MEMORY;
 658         dpc->function = function;
 659         dpc->context = context;
 660
 661         if (type == OSL_NOTIFY_HANDLER) {
 662                 p = kthread_create(acpi_os_execute_thread, dpc, "kacpid_notify");
 663                 if (!IS_ERR(p)) {
 664                         wake_up_process(p);
 665                 } else {
 666                         status = AE_NO_MEMORY;
 667                         kfree(dpc);
 668                 }
 669         } else {
 670                 task = (void *)(dpc + 1);
 671                 INIT_WORK(task, acpi_os_execute_deferred, (void *)dpc);
 672                 if (!queue_work(kacpid_wq, task)) {
 673                         status = AE_ERROR;
 674                         kfree(dpc);
 675                 }
 676         }
 677         return status;
 678 }
 679
 680 EXPORT_SYMBOL(acpi_os_execute);
 681
 682 void acpi_os_wait_events_complete(void *context)
 683 {
 684         flush_workqueue(kacpid_wq);
 685 }
 686
 687 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 688
 689 /*
 690  * Allocate the memory for a spinlock and initialize it.
 691  */
 692 acpi_status acpi_os_create_lock(acpi_handle * out_handle)
 693 {
 694         spinlock_t *lock_ptr;
 695
 696         ACPI_FUNCTION_TRACE("os_create_lock");
 697
 698         lock_ptr = acpi_os_allocate(sizeof(spinlock_t));
 699
 700         spin_lock_init(lock_ptr);
 701
 702         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));
 703
 704         *out_handle = lock_ptr;
 705
 706         return_ACPI_STATUS(AE_OK);
 707 }
 708
 709 /*
 710  * Deallocate the memory for a spinlock.
 711  */
 712 void acpi_os_delete_lock(acpi_handle handle)
 713 {
 714         ACPI_FUNCTION_TRACE("os_create_lock");
 715
 716         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));
 717
 718         acpi_os_free(handle);
 719
 720         return_VOID;
 721 }
 722
 723 acpi_status
 724 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 725 {
 726         struct semaphore *sem = NULL;
 727
 728         ACPI_FUNCTION_TRACE("os_create_semaphore");
 729
 730         sem = acpi_os_allocate(sizeof(struct semaphore));
 731         if (!sem)
 732                 return_ACPI_STATUS(AE_NO_MEMORY);
 733         memset(sem, 0, sizeof(struct semaphore));
 734
 735         sema_init(sem, initial_units);
 736
 737         *handle = (acpi_handle *) sem;
 738
 739         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 740                           *handle, initial_units));
 741
 742         return_ACPI_STATUS(AE_OK);
 743 }
 744
 745 EXPORT_SYMBOL(acpi_os_create_semaphore);
 746
 747 /*
 748  * TODO: A better way to delete semaphores?  Linux doesn't have a
 749  * 'delete_semaphore()' function -- may result in an invalid
 750  * pointer dereference for non-synchronized consumers.  Should
 751  * we at least check for blocked threads and signal/cancel them?
 752  */
 753
 754 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 755 {
 756         struct semaphore *sem = (struct semaphore *)handle;
 757
 758         ACPI_FUNCTION_TRACE("os_delete_semaphore");
 759
 760         if (!sem)
 761                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 762
 763         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 764
 765         acpi_os_free(sem);
 766         sem = NULL;
 767
 768         return_ACPI_STATUS(AE_OK);
 769 }
 770
 771 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 772
 773 /*
 774  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 775  * improvise.  The process is to sleep for one scheduler quantum
 776  * until the semaphore becomes available.  Downside is that this
 777  * may result in starvation for timeout-based waits when there's
 778  * lots of semaphore activity.
 779  *
 780  * TODO: Support for units > 1?
 781  */
 782 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 783 {
 784         acpi_status status = AE_OK;
 785         struct semaphore *sem = (struct semaphore *)handle;
 786         int ret = 0;
 787
 788         ACPI_FUNCTION_TRACE("os_wait_semaphore");
 789
 790         if (!sem || (units < 1))
 791                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 792
 793         if (units > 1)
 794                 return_ACPI_STATUS(AE_SUPPORT);
 795
 796         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 797                           handle, units, timeout));
 798
 799         switch (timeout) {
 800                 /*
 801                  * No Wait:
 802                  * --------
 803                  * A zero timeout value indicates that we shouldn't wait - just
 804                  * acquire the semaphore if available otherwise return AE_TIME
 805                  * (a.k.a. 'would block').
 806                  */
 807         case 0:
 808                 if (down_trylock(sem))
 809                         status = AE_TIME;
 810                 break;
 811
 812                 /*
 813                  * Wait Indefinitely:
 814                  * ------------------
 815                  */
 816         case ACPI_WAIT_FOREVER:
 817                 down(sem);
 818                 break;
 819
 820                 /*
 821                  * Wait w/ Timeout:
 822                  * ----------------
 823                  */
 824         default:
 825                 // TODO: A better timeout algorithm?
 826                 {
 827                         int i = 0;
 828                         static const int quantum_ms = 1000 / HZ;
 829
 830                         ret = down_trylock(sem);
 831                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 832                                 schedule_timeout_interruptible(1);
 833                                 ret = down_trylock(sem);
 834                         }
 835
 836                         if (ret != 0)
 837                                 status = AE_TIME;
 838                 }
 839                 break;
 840         }
 841
 842         if (ACPI_FAILURE(status)) {
 843                 ACPI_EXCEPTION((AE_INFO, status,
 844                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 845                                   handle, units, timeout,
 846                                   acpi_format_exception(status)));
 847         } else {
 848                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 849                                   "Acquired semaphore[%p|%d|%d]", handle,
 850                                   units, timeout));
 851         }
 852
 853         return_ACPI_STATUS(status);
 854 }
 855
 856 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 857
 858 /*
 859  * TODO: Support for units > 1?
 860  */
 861 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 862 {
 863         struct semaphore *sem = (struct semaphore *)handle;
 864
 865         ACPI_FUNCTION_TRACE("os_signal_semaphore");
 866
 867         if (!sem || (units < 1))
 868                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 869
 870         if (units > 1)
 871                 return_ACPI_STATUS(AE_SUPPORT);
 872
 873         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 874                           units));
 875
 876         up(sem);
 877
 878         return_ACPI_STATUS(AE_OK);
 879 }
 880
 881 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 882
 883 #ifdef ACPI_FUTURE_USAGE
 884 u32 acpi_os_get_line(char *buffer)
 885 {
 886
 887 #ifdef ENABLE_DEBUGGER
 888         if (acpi_in_debugger) {
 889                 u32 chars;
 890
 891                 kdb_read(buffer, sizeof(line_buf));
 892
 893                 /* remove the CR kdb includes */
 894                 chars = strlen(buffer) - 1;
 895                 buffer[chars] = '\0';
 896         }
 897 #endif
 898
 899         return 0;
 900 }
 901 #endif                          /*  ACPI_FUTURE_USAGE  */
 902
 903 /* Assumes no unreadable holes inbetween */
 904 u8 acpi_os_readable(void *ptr, acpi_size len)
 905 {
 906 #if defined(__i386__) || defined(__x86_64__)
 907         char tmp;
 908         return !__get_user(tmp, (char __user *)ptr)
 909             && !__get_user(tmp, (char __user *)ptr + len - 1);
 910 #endif
 911         return 1;
 912 }
 913
 914 #ifdef ACPI_FUTURE_USAGE
 915 u8 acpi_os_writable(void *ptr, acpi_size len)
 916 {
 917         /* could do dummy write (racy) or a kernel page table lookup.
 918            The later may be difficult at early boot when kmap doesn't work yet. */
 919         return 1;
 920 }
 921 #endif
 922
 923 acpi_status acpi_os_signal(u32 function, void *info)
 924 {
 925         switch (function) {
 926         case ACPI_SIGNAL_FATAL:
 927                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 928                 break;
 929         case ACPI_SIGNAL_BREAKPOINT:
 930                 /*
 931                  * AML Breakpoint
 932                  * ACPI spec. says to treat it as a NOP unless
 933                  * you are debugging.  So if/when we integrate
 934                  * AML debugger into the kernel debugger its
 935                  * hook will go here.  But until then it is
 936                  * not useful to print anything on breakpoints.
 937                  */
 938                 break;
 939         default:
 940                 break;
 941         }
 942
 943         return AE_OK;
 944 }
 945
 946 EXPORT_SYMBOL(acpi_os_signal);
 947
 948 static int __init acpi_os_name_setup(char *str)
 949 {
 950         char *p = acpi_os_name;
 951         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 952
 953         if (!str || !*str)
 954                 return 0;
 955
 956         for (; count-- && str && *str; str++) {
 957                 if (isalnum(*str) || *str == ' ' || *str == ':')
 958                         *p++ = *str;
 959                 else if (*str == '\'' || *str == '"')
 960                         continue;
 961                 else
 962                         break;
 963         }
 964         *p = 0;
 965
 966         return 1;
 967
 968 }
 969
 970 __setup("acpi_os_name=", acpi_os_name_setup);
 971
 972 /*
 973  * _OSI control
 974  * empty string disables _OSI
 975  * TBD additional string adds to _OSI
 976  */
 977 static int __init acpi_osi_setup(char *str)
 978 {
 979         if (str == NULL || *str == '\0') {
 980                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 981                 acpi_gbl_create_osi_method = FALSE;
 982         } else {
 983                 /* TBD */
 984                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 985                        str);
 986         }
 987
 988         return 1;
 989 }
 990
 991 __setup("acpi_osi=", acpi_osi_setup);
 992
 993 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 994 static int __init acpi_serialize_setup(char *str)
 995 {
 996         printk(KERN_INFO PREFIX "serialize enabled\n");
 997
 998         acpi_gbl_all_methods_serialized = TRUE;
 999
1000         return 1;
1001 }
1002
1003 __setup("acpi_serialize", acpi_serialize_setup);
1004
1005 /*
1006  * Wake and Run-Time GPES are expected to be separate.
1007  * We disable wake-GPEs at run-time to prevent spurious
1008  * interrupts.
1009  *
1010  * However, if a system exists that shares Wake and
1011  * Run-time events on the same GPE this flag is available
1012  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1013  */
1014 static int __init acpi_wake_gpes_always_on_setup(char *str)
1015 {
1016         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1017
1018         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1019
1020         return 1;
1021 }
1022
1023 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1024
1025 static int __init acpi_hotkey_setup(char *str)
1026 {
1027         acpi_specific_hotkey_enabled = FALSE;
1028         return 1;
1029 }
1030
1031 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
1032
1033 /*
1034  * max_cstate is defined in the base kernel so modules can
1035  * change it w/o depending on the state of the processor module.
1036  */
1037 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1038
1039 EXPORT_SYMBOL(max_cstate);
1040
1041 /*
1042  * Acquire a spinlock.
1043  *
1044  * handle is a pointer to the spinlock_t.
1045  */
1046
1047 acpi_cpu_flags acpi_os_acquire_lock(acpi_handle handle)
1048 {
1049         acpi_cpu_flags flags;
1050         spin_lock_irqsave((spinlock_t *) handle, flags);
1051         return flags;
1052 }
1053
1054 /*
1055  * Release a spinlock. See above.
1056  */
1057
1058 void acpi_os_release_lock(acpi_handle handle, acpi_cpu_flags flags)
1059 {
1060         spin_unlock_irqrestore((spinlock_t *) handle, flags);
1061 }
1062
1063 #ifndef ACPI_USE_LOCAL_CACHE
1064
1065 /*******************************************************************************
1066  *
1067  * FUNCTION:    acpi_os_create_cache
1068  *
1069  * PARAMETERS:  name      - Ascii name for the cache
1070  *              size      - Size of each cached object
1071  *              depth     - Maximum depth of the cache (in objects) <ignored>
1072  *              cache     - Where the new cache object is returned
1073  *
1074  * RETURN:      status
1075  *
1076  * DESCRIPTION: Create a cache object
1077  *
1078  ******************************************************************************/
1079
1080 acpi_status
1081 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1082 {
1083         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1084         if (cache == NULL)
1085                 return AE_ERROR;
1086         else
1087                 return AE_OK;
1088 }
1089
1090 /*******************************************************************************
1091  *
1092  * FUNCTION:    acpi_os_purge_cache
1093  *
1094  * PARAMETERS:  Cache           - Handle to cache object
1095  *
1096  * RETURN:      Status
1097  *
1098  * DESCRIPTION: Free all objects within the requested cache.
1099  *
1100  ******************************************************************************/
1101
1102 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1103 {
1104         (void)kmem_cache_shrink(cache);
1105         return (AE_OK);
1106 }
1107
1108 /*******************************************************************************
1109  *
1110  * FUNCTION:    acpi_os_delete_cache
1111  *
1112  * PARAMETERS:  Cache           - Handle to cache object
1113  *
1114  * RETURN:      Status
1115  *
1116  * DESCRIPTION: Free all objects within the requested cache and delete the
1117  *              cache object.
1118  *
1119  ******************************************************************************/
1120
1121 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1122 {
1123         (void)kmem_cache_destroy(cache);
1124         return (AE_OK);
1125 }
1126
1127 /*******************************************************************************
1128  *
1129  * FUNCTION:    acpi_os_release_object
1130  *
1131  * PARAMETERS:  Cache       - Handle to cache object
1132  *              Object      - The object to be released
1133  *
1134  * RETURN:      None
1135  *
1136  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1137  *              the object is deleted.
1138  *
1139  ******************************************************************************/
1140
1141 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1142 {
1143         kmem_cache_free(cache, object);
1144         return (AE_OK);
1145 }
1146
1147 /*******************************************************************************
1148  *
1149  * FUNCTION:    acpi_os_acquire_object
1150  *
1151  * PARAMETERS:  Cache           - Handle to cache object
1152  *              ReturnObject    - Where the object is returned
1153  *
1154  * RETURN:      Status
1155  *
1156  * DESCRIPTION: Return a zero-filled object.
1157  *
1158  ******************************************************************************/
1159
1160 void *acpi_os_acquire_object(acpi_cache_t * cache)
1161 {
1162         void *object = kmem_cache_zalloc(cache, GFP_KERNEL);
1163         WARN_ON(!object);
1164         return object;
1165 }
1166
1167 /******************************************************************************
1168  *
1169  * FUNCTION:    acpi_os_validate_interface
1170  *
1171  * PARAMETERS:  interface           - Requested interface to be validated
1172  *
1173  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1174  *
1175  * DESCRIPTION: Match an interface string to the interfaces supported by the
1176  *              host. Strings originate from an AML call to the _OSI method.
1177  *
1178  *****************************************************************************/
1179
1180 acpi_status
1181 acpi_os_validate_interface (char *interface)
1182 {
1183
1184     return AE_SUPPORT;
1185 }
1186
1187
1188 /******************************************************************************
1189  *
1190  * FUNCTION:    acpi_os_validate_address
1191  *
1192  * PARAMETERS:  space_id             - ACPI space ID
1193  *              address             - Physical address
1194  *              length              - Address length
1195  *
1196  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1197  *              should return AE_AML_ILLEGAL_ADDRESS.
1198  *
1199  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1200  *              the addresses accessed by AML operation regions.
1201  *
1202  *****************************************************************************/
1203
1204 acpi_status
1205 acpi_os_validate_address (
1206     u8                   space_id,
1207     acpi_physical_address   address,
1208     acpi_size               length)
1209 {
1210
1211     return AE_OK;
1212 }
1213
1214
1215 #endif