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