drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/mm.h>
  32 #include <linux/pci.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/kmod.h>
  36 #include <linux/delay.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/nmi.h>
  39 #include <linux/kthread.h>
  40 #include <acpi/acpi.h>
  41 #include <asm/io.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/processor.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <linux/efi.h>
  47
  48 #define _COMPONENT              ACPI_OS_SERVICES
  49 ACPI_MODULE_NAME("osl")
  50 #define PREFIX          "ACPI: "
  51 struct acpi_os_dpc {
  52         acpi_osd_exec_callback function;
  53         void *context;
  54 };
  55
  56 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  57 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  58 #endif
  59
  60 #ifdef ENABLE_DEBUGGER
  61 #include <linux/kdb.h>
  62
  63 /* stuff for debugger support */
  64 int acpi_in_debugger;
  65 EXPORT_SYMBOL(acpi_in_debugger);
  66
  67 extern char line_buf[80];
  68 #endif                          /*ENABLE_DEBUGGER */
  69
  70 int acpi_specific_hotkey_enabled = TRUE;
  71 EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
  72
  73 static unsigned int acpi_irq_irq;
  74 static acpi_osd_handler acpi_irq_handler;
  75 static void *acpi_irq_context;
  76 static struct workqueue_struct *kacpid_wq;
  77
  78 acpi_status acpi_os_initialize(void)
  79 {
  80         return AE_OK;
  81 }
  82
  83 acpi_status acpi_os_initialize1(void)
  84 {
  85         /*
  86          * Initialize PCI configuration space access, as we'll need to access
  87          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
  88          */
  89         if (!raw_pci_ops) {
  90                 printk(KERN_ERR PREFIX
  91                        "Access to PCI configuration space unavailable\n");
  92                 return AE_NULL_ENTRY;
  93         }
  94         kacpid_wq = create_singlethread_workqueue("kacpid");
  95         BUG_ON(!kacpid_wq);
  96
  97         return AE_OK;
  98 }
  99
 100 acpi_status acpi_os_terminate(void)
 101 {
 102         if (acpi_irq_handler) {
 103                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 104                                                  acpi_irq_handler);
 105         }
 106
 107         destroy_workqueue(kacpid_wq);
 108
 109         return AE_OK;
 110 }
 111
 112 void acpi_os_printf(const char *fmt, ...)
 113 {
 114         va_list args;
 115         va_start(args, fmt);
 116         acpi_os_vprintf(fmt, args);
 117         va_end(args);
 118 }
 119
 120 EXPORT_SYMBOL(acpi_os_printf);
 121
 122 void acpi_os_vprintf(const char *fmt, va_list args)
 123 {
 124         static char buffer[512];
 125
 126         vsprintf(buffer, fmt, args);
 127
 128 #ifdef ENABLE_DEBUGGER
 129         if (acpi_in_debugger) {
 130                 kdb_printf("%s", buffer);
 131         } else {
 132                 printk("%s", buffer);
 133         }
 134 #else
 135         printk("%s", buffer);
 136 #endif
 137 }
 138
 139 extern int acpi_in_resume;
 140 void *acpi_os_allocate(acpi_size size)
 141 {
 142         if (acpi_in_resume)
 143                 return kmalloc(size, GFP_ATOMIC);
 144         else
 145                 return kmalloc(size, GFP_KERNEL);
 146 }
 147
 148 void acpi_os_free(void *ptr)
 149 {
 150         kfree(ptr);
 151 }
 152
 153 EXPORT_SYMBOL(acpi_os_free);
 154
 155 acpi_status acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
 156 {
 157         if (efi_enabled) {
 158                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
 159                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 160                         addr->pointer.physical = efi.acpi20;
 161                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 162                         addr->pointer.physical = efi.acpi;
 163                 else {
 164                         printk(KERN_ERR PREFIX
 165                                "System description tables not found\n");
 166                         return AE_NOT_FOUND;
 167                 }
 168         } else {
 169                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
 170                         printk(KERN_ERR PREFIX
 171                                "System description tables not found\n");
 172                         return AE_NOT_FOUND;
 173                 }
 174         }
 175
 176         return AE_OK;
 177 }
 178
 179 acpi_status
 180 acpi_os_map_memory(acpi_physical_address phys, acpi_size size,
 181                    void __iomem ** virt)
 182 {
 183         if (phys > ULONG_MAX) {
 184                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 185                 return AE_BAD_PARAMETER;
 186         }
 187         /*
 188          * ioremap checks to ensure this is in reserved space
 189          */
 190         *virt = ioremap((unsigned long)phys, size);
 191
 192         if (!*virt)
 193                 return AE_NO_MEMORY;
 194
 195         return AE_OK;
 196 }
 197 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 198
 199 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 200 {
 201         iounmap(virt);
 202 }
 203 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 204
 205 #ifdef ACPI_FUTURE_USAGE
 206 acpi_status
 207 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 208 {
 209         if (!phys || !virt)
 210                 return AE_BAD_PARAMETER;
 211
 212         *phys = virt_to_phys(virt);
 213
 214         return AE_OK;
 215 }
 216 #endif
 217
 218 #define ACPI_MAX_OVERRIDE_LEN 100
 219
 220 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 221
 222 acpi_status
 223 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 224                             acpi_string * new_val)
 225 {
 226         if (!init_val || !new_val)
 227                 return AE_BAD_PARAMETER;
 228
 229         *new_val = NULL;
 230         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 231                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 232                        acpi_os_name);
 233                 *new_val = acpi_os_name;
 234         }
 235
 236         return AE_OK;
 237 }
 238
 239 acpi_status
 240 acpi_os_table_override(struct acpi_table_header * existing_table,
 241                        struct acpi_table_header ** new_table)
 242 {
 243         if (!existing_table || !new_table)
 244                 return AE_BAD_PARAMETER;
 245
 246 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 247         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 248                 *new_table = (struct acpi_table_header *)AmlCode;
 249         else
 250                 *new_table = NULL;
 251 #else
 252         *new_table = NULL;
 253 #endif
 254         return AE_OK;
 255 }
 256
 257 static irqreturn_t acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
 258 {
 259         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 260 }
 261
 262 acpi_status
 263 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 264                                   void *context)
 265 {
 266         unsigned int irq;
 267
 268         /*
 269          * Ignore the GSI from the core, and use the value in our copy of the
 270          * FADT. It may not be the same if an interrupt source override exists
 271          * for the SCI.
 272          */
 273         gsi = acpi_fadt.sci_int;
 274         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 275                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 276                        gsi);
 277                 return AE_OK;
 278         }
 279
 280         acpi_irq_handler = handler;
 281         acpi_irq_context = context;
 282         if (request_irq(irq, acpi_irq, SA_SHIRQ, "acpi", acpi_irq)) {
 283                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 284                 return AE_NOT_ACQUIRED;
 285         }
 286         acpi_irq_irq = irq;
 287
 288         return AE_OK;
 289 }
 290
 291 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 292 {
 293         if (irq) {
 294                 free_irq(irq, acpi_irq);
 295                 acpi_irq_handler = NULL;
 296                 acpi_irq_irq = 0;
 297         }
 298
 299         return AE_OK;
 300 }
 301
 302 /*
 303  * Running in interpreter thread context, safe to sleep
 304  */
 305
 306 void acpi_os_sleep(acpi_integer ms)
 307 {
 308         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 309 }
 310
 311 EXPORT_SYMBOL(acpi_os_sleep);
 312
 313 void acpi_os_stall(u32 us)
 314 {
 315         while (us) {
 316                 u32 delay = 1000;
 317
 318                 if (delay > us)
 319                         delay = us;
 320                 udelay(delay);
 321                 touch_nmi_watchdog();
 322                 us -= delay;
 323         }
 324 }
 325
 326 EXPORT_SYMBOL(acpi_os_stall);
 327
 328 /*
 329  * Support ACPI 3.0 AML Timer operand
 330  * Returns 64-bit free-running, monotonically increasing timer
 331  * with 100ns granularity
 332  */
 333 u64 acpi_os_get_timer(void)
 334 {
 335         static u64 t;
 336
 337 #ifdef  CONFIG_HPET
 338         /* TBD: use HPET if available */
 339 #endif
 340
 341 #ifdef  CONFIG_X86_PM_TIMER
 342         /* TBD: default to PM timer if HPET was not available */
 343 #endif
 344         if (!t)
 345                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 346
 347         return ++t;
 348 }
 349
 350 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 351 {
 352         u32 dummy;
 353
 354         if (!value)
 355                 value = &dummy;
 356
 357         switch (width) {
 358         case 8:
 359                 *(u8 *) value = inb(port);
 360                 break;
 361         case 16:
 362                 *(u16 *) value = inw(port);
 363                 break;
 364         case 32:
 365                 *(u32 *) value = inl(port);
 366                 break;
 367         default:
 368                 BUG();
 369         }
 370
 371         return AE_OK;
 372 }
 373
 374 EXPORT_SYMBOL(acpi_os_read_port);
 375
 376 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 377 {
 378         switch (width) {
 379         case 8:
 380                 outb(value, port);
 381                 break;
 382         case 16:
 383                 outw(value, port);
 384                 break;
 385         case 32:
 386                 outl(value, port);
 387                 break;
 388         default:
 389                 BUG();
 390         }
 391
 392         return AE_OK;
 393 }
 394
 395 EXPORT_SYMBOL(acpi_os_write_port);
 396
 397 acpi_status
 398 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 399 {
 400         u32 dummy;
 401         void __iomem *virt_addr;
 402
 403         virt_addr = ioremap(phys_addr, width);
 404         if (!value)
 405                 value = &dummy;
 406
 407         switch (width) {
 408         case 8:
 409                 *(u8 *) value = readb(virt_addr);
 410                 break;
 411         case 16:
 412                 *(u16 *) value = readw(virt_addr);
 413                 break;
 414         case 32:
 415                 *(u32 *) value = readl(virt_addr);
 416                 break;
 417         default:
 418                 BUG();
 419         }
 420
 421         iounmap(virt_addr);
 422
 423         return AE_OK;
 424 }
 425
 426 acpi_status
 427 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 428 {
 429         void __iomem *virt_addr;
 430
 431         virt_addr = ioremap(phys_addr, width);
 432
 433         switch (width) {
 434         case 8:
 435                 writeb(value, virt_addr);
 436                 break;
 437         case 16:
 438                 writew(value, virt_addr);
 439                 break;
 440         case 32:
 441                 writel(value, virt_addr);
 442                 break;
 443         default:
 444                 BUG();
 445         }
 446
 447         iounmap(virt_addr);
 448
 449         return AE_OK;
 450 }
 451
 452 acpi_status
 453 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 454                                void *value, u32 width)
 455 {
 456         int result, size;
 457
 458         if (!value)
 459                 return AE_BAD_PARAMETER;
 460
 461         switch (width) {
 462         case 8:
 463                 size = 1;
 464                 break;
 465         case 16:
 466                 size = 2;
 467                 break;
 468         case 32:
 469                 size = 4;
 470                 break;
 471         default:
 472                 return AE_ERROR;
 473         }
 474
 475         BUG_ON(!raw_pci_ops);
 476
 477         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 478                                    PCI_DEVFN(pci_id->device, pci_id->function),
 479                                    reg, size, value);
 480
 481         return (result ? AE_ERROR : AE_OK);
 482 }
 483
 484 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 485
 486 acpi_status
 487 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 488                                 acpi_integer value, u32 width)
 489 {
 490         int result, size;
 491
 492         switch (width) {
 493         case 8:
 494                 size = 1;
 495                 break;
 496         case 16:
 497                 size = 2;
 498                 break;
 499         case 32:
 500                 size = 4;
 501                 break;
 502         default:
 503                 return AE_ERROR;
 504         }
 505
 506         BUG_ON(!raw_pci_ops);
 507
 508         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 509                                     PCI_DEVFN(pci_id->device, pci_id->function),
 510                                     reg, size, value);
 511
 512         return (result ? AE_ERROR : AE_OK);
 513 }
 514
 515 /* TODO: Change code to take advantage of driver model more */
 516 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 517                                     acpi_handle chandle,        /* current node */
 518                                     struct acpi_pci_id **id,
 519                                     int *is_bridge, u8 * bus_number)
 520 {
 521         acpi_handle handle;
 522         struct acpi_pci_id *pci_id = *id;
 523         acpi_status status;
 524         unsigned long temp;
 525         acpi_object_type type;
 526         u8 tu8;
 527
 528         acpi_get_parent(chandle, &handle);
 529         if (handle != rhandle) {
 530                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 531                                         bus_number);
 532
 533                 status = acpi_get_type(handle, &type);
 534                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 535                         return;
 536
 537                 status =
 538                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 539                                           &temp);
 540                 if (ACPI_SUCCESS(status)) {
 541                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 542                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 543
 544                         if (*is_bridge)
 545                                 pci_id->bus = *bus_number;
 546
 547                         /* any nicer way to get bus number of bridge ? */
 548                         status =
 549                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 550                                                            8);
 551                         if (ACPI_SUCCESS(status)
 552                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 553                                 status =
 554                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 555                                                                    &tu8, 8);
 556                                 if (!ACPI_SUCCESS(status)) {
 557                                         /* Certainly broken...  FIX ME */
 558                                         return;
 559                                 }
 560                                 *is_bridge = 1;
 561                                 pci_id->bus = tu8;
 562                                 status =
 563                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 564                                                                    &tu8, 8);
 565                                 if (ACPI_SUCCESS(status)) {
 566                                         *bus_number = tu8;
 567                                 }
 568                         } else
 569                                 *is_bridge = 0;
 570                 }
 571         }
 572 }
 573
 574 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 575                            acpi_handle chandle, /* current node */
 576                            struct acpi_pci_id **id)
 577 {
 578         int is_bridge = 1;
 579         u8 bus_number = (*id)->bus;
 580
 581         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 582 }
 583
 584 static void acpi_os_execute_deferred(void *context)
 585 {
 586         struct acpi_os_dpc *dpc = NULL;
 587
 588         ACPI_FUNCTION_TRACE("os_execute_deferred");
 589
 590         dpc = (struct acpi_os_dpc *)context;
 591         if (!dpc) {
 592                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 593                 return_VOID;
 594         }
 595
 596         dpc->function(dpc->context);
 597
 598         kfree(dpc);
 599
 600         return_VOID;
 601 }
 602
 603 static int acpi_os_execute_thread(void *context)
 604 {
 605         struct acpi_os_dpc *dpc = (struct acpi_os_dpc *)context;
 606         if (dpc) {
 607                 dpc->function(dpc->context);
 608                 kfree(dpc);
 609         }
 610         do_exit(0);
 611 }
 612
 613 /*******************************************************************************
 614  *
 615  * FUNCTION:    acpi_os_execute
 616  *
 617  * PARAMETERS:  Type               - Type of the callback
 618  *              Function           - Function to be executed
 619  *              Context            - Function parameters
 620  *
 621  * RETURN:      Status
 622  *
 623  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 624  *              immediately executes function on a separate thread.
 625  *
 626  ******************************************************************************/
 627
 628 acpi_status acpi_os_execute(acpi_execute_type type,
 629                             acpi_osd_exec_callback function, void *context)
 630 {
 631         acpi_status status = AE_OK;
 632         struct acpi_os_dpc *dpc;
 633         struct work_struct *task;
 634         struct task_struct *p;
 635
 636         if (!function)
 637                 return AE_BAD_PARAMETER;
 638         /*
 639          * Allocate/initialize DPC structure.  Note that this memory will be
 640          * freed by the callee.  The kernel handles the tq_struct list  in a
 641          * way that allows us to also free its memory inside the callee.
 642          * Because we may want to schedule several tasks with different
 643          * parameters we can't use the approach some kernel code uses of
 644          * having a static tq_struct.
 645          * We can save time and code by allocating the DPC and tq_structs
 646          * from the same memory.
 647          */
 648         if (type == OSL_NOTIFY_HANDLER) {
 649                 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_KERNEL);
 650         } else {
 651                 dpc = kmalloc(sizeof(struct acpi_os_dpc) +
 652                                 sizeof(struct work_struct), GFP_ATOMIC);
 653         }
 654         if (!dpc)
 655                 return AE_NO_MEMORY;
 656         dpc->function = function;
 657         dpc->context = context;
 658
 659         if (type == OSL_NOTIFY_HANDLER) {
 660                 p = kthread_create(acpi_os_execute_thread, dpc, "kacpid_notify");
 661                 if (!IS_ERR(p)) {
 662                         wake_up_process(p);
 663                 } else {
 664                         status = AE_NO_MEMORY;
 665                         kfree(dpc);
 666                 }
 667         } else {
 668                 task = (void *)(dpc + 1);
 669                 INIT_WORK(task, acpi_os_execute_deferred, (void *)dpc);
 670                 if (!queue_work(kacpid_wq, task)) {
 671                         status = AE_ERROR;
 672                         kfree(dpc);
 673                 }
 674         }
 675         return status;
 676 }
 677
 678 EXPORT_SYMBOL(acpi_os_execute);
 679
 680 void acpi_os_wait_events_complete(void *context)
 681 {
 682         flush_workqueue(kacpid_wq);
 683 }
 684
 685 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 686
 687 /*
 688  * Allocate the memory for a spinlock and initialize it.
 689  */
 690 acpi_status acpi_os_create_lock(acpi_handle * out_handle)
 691 {
 692         spinlock_t *lock_ptr;
 693
 694         ACPI_FUNCTION_TRACE("os_create_lock");
 695
 696         lock_ptr = acpi_os_allocate(sizeof(spinlock_t));
 697
 698         spin_lock_init(lock_ptr);
 699
 700         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));
 701
 702         *out_handle = lock_ptr;
 703
 704         return_ACPI_STATUS(AE_OK);
 705 }
 706
 707 /*
 708  * Deallocate the memory for a spinlock.
 709  */
 710 void acpi_os_delete_lock(acpi_handle handle)
 711 {
 712         ACPI_FUNCTION_TRACE("os_create_lock");
 713
 714         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));
 715
 716         acpi_os_free(handle);
 717
 718         return_VOID;
 719 }
 720
 721 acpi_status
 722 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 723 {
 724         struct semaphore *sem = NULL;
 725
 726         ACPI_FUNCTION_TRACE("os_create_semaphore");
 727
 728         sem = acpi_os_allocate(sizeof(struct semaphore));
 729         if (!sem)
 730                 return_ACPI_STATUS(AE_NO_MEMORY);
 731         memset(sem, 0, sizeof(struct semaphore));
 732
 733         sema_init(sem, initial_units);
 734
 735         *handle = (acpi_handle *) sem;
 736
 737         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 738                           *handle, initial_units));
 739
 740         return_ACPI_STATUS(AE_OK);
 741 }
 742
 743 EXPORT_SYMBOL(acpi_os_create_semaphore);
 744
 745 /*
 746  * TODO: A better way to delete semaphores?  Linux doesn't have a
 747  * 'delete_semaphore()' function -- may result in an invalid
 748  * pointer dereference for non-synchronized consumers.  Should
 749  * we at least check for blocked threads and signal/cancel them?
 750  */
 751
 752 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 753 {
 754         struct semaphore *sem = (struct semaphore *)handle;
 755
 756         ACPI_FUNCTION_TRACE("os_delete_semaphore");
 757
 758         if (!sem)
 759                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 760
 761         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 762
 763         acpi_os_free(sem);
 764         sem = NULL;
 765
 766         return_ACPI_STATUS(AE_OK);
 767 }
 768
 769 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 770
 771 /*
 772  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 773  * improvise.  The process is to sleep for one scheduler quantum
 774  * until the semaphore becomes available.  Downside is that this
 775  * may result in starvation for timeout-based waits when there's
 776  * lots of semaphore activity.
 777  *
 778  * TODO: Support for units > 1?
 779  */
 780 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 781 {
 782         acpi_status status = AE_OK;
 783         struct semaphore *sem = (struct semaphore *)handle;
 784         int ret = 0;
 785
 786         ACPI_FUNCTION_TRACE("os_wait_semaphore");
 787
 788         if (!sem || (units < 1))
 789                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 790
 791         if (units > 1)
 792                 return_ACPI_STATUS(AE_SUPPORT);
 793
 794         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 795                           handle, units, timeout));
 796
 797         switch (timeout) {
 798                 /*
 799                  * No Wait:
 800                  * --------
 801                  * A zero timeout value indicates that we shouldn't wait - just
 802                  * acquire the semaphore if available otherwise return AE_TIME
 803                  * (a.k.a. 'would block').
 804                  */
 805         case 0:
 806                 if (down_trylock(sem))
 807                         status = AE_TIME;
 808                 break;
 809
 810                 /*
 811                  * Wait Indefinitely:
 812                  * ------------------
 813                  */
 814         case ACPI_WAIT_FOREVER:
 815                 down(sem);
 816                 break;
 817
 818                 /*
 819                  * Wait w/ Timeout:
 820                  * ----------------
 821                  */
 822         default:
 823                 // TODO: A better timeout algorithm?
 824                 {
 825                         int i = 0;
 826                         static const int quantum_ms = 1000 / HZ;
 827
 828                         ret = down_trylock(sem);
 829                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 830                                 schedule_timeout_interruptible(1);
 831                                 ret = down_trylock(sem);
 832                         }
 833
 834                         if (ret != 0)
 835                                 status = AE_TIME;
 836                 }
 837                 break;
 838         }
 839
 840         if (ACPI_FAILURE(status)) {
 841                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 842                                   "Failed to acquire semaphore[%p|%d|%d], %s\n",
 843                                   handle, units, timeout,
 844                                   acpi_format_exception(status)));
 845         } else {
 846                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 847                                   "Acquired semaphore[%p|%d|%d]\n", handle,
 848                                   units, timeout));
 849         }
 850
 851         return_ACPI_STATUS(status);
 852 }
 853
 854 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 855
 856 /*
 857  * TODO: Support for units > 1?
 858  */
 859 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 860 {
 861         struct semaphore *sem = (struct semaphore *)handle;
 862
 863         ACPI_FUNCTION_TRACE("os_signal_semaphore");
 864
 865         if (!sem || (units < 1))
 866                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 867
 868         if (units > 1)
 869                 return_ACPI_STATUS(AE_SUPPORT);
 870
 871         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 872                           units));
 873
 874         up(sem);
 875
 876         return_ACPI_STATUS(AE_OK);
 877 }
 878
 879 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 880
 881 #ifdef ACPI_FUTURE_USAGE
 882 u32 acpi_os_get_line(char *buffer)
 883 {
 884
 885 #ifdef ENABLE_DEBUGGER
 886         if (acpi_in_debugger) {
 887                 u32 chars;
 888
 889                 kdb_read(buffer, sizeof(line_buf));
 890
 891                 /* remove the CR kdb includes */
 892                 chars = strlen(buffer) - 1;
 893                 buffer[chars] = '\0';
 894         }
 895 #endif
 896
 897         return 0;
 898 }
 899 #endif                          /*  ACPI_FUTURE_USAGE  */
 900
 901 /* Assumes no unreadable holes inbetween */
 902 u8 acpi_os_readable(void *ptr, acpi_size len)
 903 {
 904 #if defined(__i386__) || defined(__x86_64__)
 905         char tmp;
 906         return !__get_user(tmp, (char __user *)ptr)
 907             && !__get_user(tmp, (char __user *)ptr + len - 1);
 908 #endif
 909         return 1;
 910 }
 911
 912 #ifdef ACPI_FUTURE_USAGE
 913 u8 acpi_os_writable(void *ptr, acpi_size len)
 914 {
 915         /* could do dummy write (racy) or a kernel page table lookup.
 916            The later may be difficult at early boot when kmap doesn't work yet. */
 917         return 1;
 918 }
 919 #endif
 920
 921 acpi_status acpi_os_signal(u32 function, void *info)
 922 {
 923         switch (function) {
 924         case ACPI_SIGNAL_FATAL:
 925                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 926                 break;
 927         case ACPI_SIGNAL_BREAKPOINT:
 928                 /*
 929                  * AML Breakpoint
 930                  * ACPI spec. says to treat it as a NOP unless
 931                  * you are debugging.  So if/when we integrate
 932                  * AML debugger into the kernel debugger its
 933                  * hook will go here.  But until then it is
 934                  * not useful to print anything on breakpoints.
 935                  */
 936                 break;
 937         default:
 938                 break;
 939         }
 940
 941         return AE_OK;
 942 }
 943
 944 EXPORT_SYMBOL(acpi_os_signal);
 945
 946 static int __init acpi_os_name_setup(char *str)
 947 {
 948         char *p = acpi_os_name;
 949         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 950
 951         if (!str || !*str)
 952                 return 0;
 953
 954         for (; count-- && str && *str; str++) {
 955                 if (isalnum(*str) || *str == ' ' || *str == ':')
 956                         *p++ = *str;
 957                 else if (*str == '\'' || *str == '"')
 958                         continue;
 959                 else
 960                         break;
 961         }
 962         *p = 0;
 963
 964         return 1;
 965
 966 }
 967
 968 __setup("acpi_os_name=", acpi_os_name_setup);
 969
 970 /*
 971  * _OSI control
 972  * empty string disables _OSI
 973  * TBD additional string adds to _OSI
 974  */
 975 static int __init acpi_osi_setup(char *str)
 976 {
 977         if (str == NULL || *str == '\0') {
 978                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 979                 acpi_gbl_create_osi_method = FALSE;
 980         } else {
 981                 /* TBD */
 982                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 983                        str);
 984         }
 985
 986         return 1;
 987 }
 988
 989 __setup("acpi_osi=", acpi_osi_setup);
 990
 991 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 992 static int __init acpi_serialize_setup(char *str)
 993 {
 994         printk(KERN_INFO PREFIX "serialize enabled\n");
 995
 996         acpi_gbl_all_methods_serialized = TRUE;
 997
 998         return 1;
 999 }
1000
1001 __setup("acpi_serialize", acpi_serialize_setup);
1002
1003 /*
1004  * Wake and Run-Time GPES are expected to be separate.
1005  * We disable wake-GPEs at run-time to prevent spurious
1006  * interrupts.
1007  *
1008  * However, if a system exists that shares Wake and
1009  * Run-time events on the same GPE this flag is available
1010  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1011  */
1012 static int __init acpi_wake_gpes_always_on_setup(char *str)
1013 {
1014         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1015
1016         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1017
1018         return 1;
1019 }
1020
1021 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1022
1023 static int __init acpi_hotkey_setup(char *str)
1024 {
1025         acpi_specific_hotkey_enabled = FALSE;
1026         return 1;
1027 }
1028
1029 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
1030
1031 /*
1032  * max_cstate is defined in the base kernel so modules can
1033  * change it w/o depending on the state of the processor module.
1034  */
1035 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1036
1037 EXPORT_SYMBOL(max_cstate);
1038
1039 /*
1040  * Acquire a spinlock.
1041  *
1042  * handle is a pointer to the spinlock_t.
1043  */
1044
1045 acpi_cpu_flags acpi_os_acquire_lock(acpi_handle handle)
1046 {
1047         acpi_cpu_flags flags;
1048         spin_lock_irqsave((spinlock_t *) handle, flags);
1049         return flags;
1050 }
1051
1052 /*
1053  * Release a spinlock. See above.
1054  */
1055
1056 void acpi_os_release_lock(acpi_handle handle, acpi_cpu_flags flags)
1057 {
1058         spin_unlock_irqrestore((spinlock_t *) handle, flags);
1059 }
1060
1061 #ifndef ACPI_USE_LOCAL_CACHE
1062
1063 /*******************************************************************************
1064  *
1065  * FUNCTION:    acpi_os_create_cache
1066  *
1067  * PARAMETERS:  name      - Ascii name for the cache
1068  *              size      - Size of each cached object
1069  *              depth     - Maximum depth of the cache (in objects) <ignored>
1070  *              cache     - Where the new cache object is returned
1071  *
1072  * RETURN:      status
1073  *
1074  * DESCRIPTION: Create a cache object
1075  *
1076  ******************************************************************************/
1077
1078 acpi_status
1079 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1080 {
1081         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1082         if (cache == NULL)
1083                 return AE_ERROR;
1084         else
1085                 return AE_OK;
1086 }
1087
1088 /*******************************************************************************
1089  *
1090  * FUNCTION:    acpi_os_purge_cache
1091  *
1092  * PARAMETERS:  Cache           - Handle to cache object
1093  *
1094  * RETURN:      Status
1095  *
1096  * DESCRIPTION: Free all objects within the requested cache.
1097  *
1098  ******************************************************************************/
1099
1100 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1101 {
1102         (void)kmem_cache_shrink(cache);
1103         return (AE_OK);
1104 }
1105
1106 /*******************************************************************************
1107  *
1108  * FUNCTION:    acpi_os_delete_cache
1109  *
1110  * PARAMETERS:  Cache           - Handle to cache object
1111  *
1112  * RETURN:      Status
1113  *
1114  * DESCRIPTION: Free all objects within the requested cache and delete the
1115  *              cache object.
1116  *
1117  ******************************************************************************/
1118
1119 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1120 {
1121         (void)kmem_cache_destroy(cache);
1122         return (AE_OK);
1123 }
1124
1125 /*******************************************************************************
1126  *
1127  * FUNCTION:    acpi_os_release_object
1128  *
1129  * PARAMETERS:  Cache       - Handle to cache object
1130  *              Object      - The object to be released
1131  *
1132  * RETURN:      None
1133  *
1134  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1135  *              the object is deleted.
1136  *
1137  ******************************************************************************/
1138
1139 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1140 {
1141         kmem_cache_free(cache, object);
1142         return (AE_OK);
1143 }
1144
1145 /*******************************************************************************
1146  *
1147  * FUNCTION:    acpi_os_acquire_object
1148  *
1149  * PARAMETERS:  Cache           - Handle to cache object
1150  *              ReturnObject    - Where the object is returned
1151  *
1152  * RETURN:      Status
1153  *
1154  * DESCRIPTION: Return a zero-filled object.
1155  *
1156  ******************************************************************************/
1157
1158 void *acpi_os_acquire_object(acpi_cache_t * cache)
1159 {
1160         void *object = kmem_cache_zalloc(cache, GFP_KERNEL);
1161         WARN_ON(!object);
1162         return object;
1163 }
1164
1165 /******************************************************************************
1166  *
1167  * FUNCTION:    acpi_os_validate_interface
1168  *
1169  * PARAMETERS:  interface           - Requested interface to be validated
1170  *
1171  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1172  *
1173  * DESCRIPTION: Match an interface string to the interfaces supported by the
1174  *              host. Strings originate from an AML call to the _OSI method.
1175  *
1176  *****************************************************************************/
1177
1178 acpi_status
1179 acpi_os_validate_interface (char *interface)
1180 {
1181
1182     return AE_SUPPORT;
1183 }
1184
1185
1186 /******************************************************************************
1187  *
1188  * FUNCTION:    acpi_os_validate_address
1189  *
1190  * PARAMETERS:  space_id             - ACPI space ID
1191  *              address             - Physical address
1192  *              length              - Address length
1193  *
1194  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1195  *              should return AE_AML_ILLEGAL_ADDRESS.
1196  *
1197  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1198  *              the addresses accessed by AML operation regions.
1199  *
1200  *****************************************************************************/
1201
1202 acpi_status
1203 acpi_os_validate_address (
1204     u8                   space_id,
1205     acpi_physical_address   address,
1206     acpi_size               length)
1207 {
1208
1209     return AE_OK;
1210 }
1211
1212
1213 #endif