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
 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, IRQF_SHARED, "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
 590         dpc = (struct acpi_os_dpc *)context;
 591         if (!dpc) {
 592                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 593                 return;
 594         }
 595
 596         dpc->function(dpc->context);
 597
 598         kfree(dpc);
 599
 600         return;
 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_spinlock * handle)
 691 {
 692         spin_lock_init(*handle);
 693
 694         return AE_OK;
 695 }
 696
 697 /*
 698  * Deallocate the memory for a spinlock.
 699  */
 700 void acpi_os_delete_lock(acpi_spinlock handle)
 701 {
 702         return;
 703 }
 704
 705 acpi_status
 706 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 707 {
 708         struct semaphore *sem = NULL;
 709
 710
 711         sem = acpi_os_allocate(sizeof(struct semaphore));
 712         if (!sem)
 713                 return AE_NO_MEMORY;
 714         memset(sem, 0, sizeof(struct semaphore));
 715
 716         sema_init(sem, initial_units);
 717
 718         *handle = (acpi_handle *) sem;
 719
 720         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 721                           *handle, initial_units));
 722
 723         return AE_OK;
 724 }
 725
 726 EXPORT_SYMBOL(acpi_os_create_semaphore);
 727
 728 /*
 729  * TODO: A better way to delete semaphores?  Linux doesn't have a
 730  * 'delete_semaphore()' function -- may result in an invalid
 731  * pointer dereference for non-synchronized consumers.  Should
 732  * we at least check for blocked threads and signal/cancel them?
 733  */
 734
 735 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 736 {
 737         struct semaphore *sem = (struct semaphore *)handle;
 738
 739
 740         if (!sem)
 741                 return AE_BAD_PARAMETER;
 742
 743         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 744
 745         acpi_os_free(sem);
 746         sem = NULL;
 747
 748         return AE_OK;
 749 }
 750
 751 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 752
 753 /*
 754  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 755  * improvise.  The process is to sleep for one scheduler quantum
 756  * until the semaphore becomes available.  Downside is that this
 757  * may result in starvation for timeout-based waits when there's
 758  * lots of semaphore activity.
 759  *
 760  * TODO: Support for units > 1?
 761  */
 762 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 763 {
 764         acpi_status status = AE_OK;
 765         struct semaphore *sem = (struct semaphore *)handle;
 766         int ret = 0;
 767
 768
 769         if (!sem || (units < 1))
 770                 return AE_BAD_PARAMETER;
 771
 772         if (units > 1)
 773                 return AE_SUPPORT;
 774
 775         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 776                           handle, units, timeout));
 777
 778         switch (timeout) {
 779                 /*
 780                  * No Wait:
 781                  * --------
 782                  * A zero timeout value indicates that we shouldn't wait - just
 783                  * acquire the semaphore if available otherwise return AE_TIME
 784                  * (a.k.a. 'would block').
 785                  */
 786         case 0:
 787                 if (down_trylock(sem))
 788                         status = AE_TIME;
 789                 break;
 790
 791                 /*
 792                  * Wait Indefinitely:
 793                  * ------------------
 794                  */
 795         case ACPI_WAIT_FOREVER:
 796                 down(sem);
 797                 break;
 798
 799                 /*
 800                  * Wait w/ Timeout:
 801                  * ----------------
 802                  */
 803         default:
 804                 // TODO: A better timeout algorithm?
 805                 {
 806                         int i = 0;
 807                         static const int quantum_ms = 1000 / HZ;
 808
 809                         ret = down_trylock(sem);
 810                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 811                                 schedule_timeout_interruptible(1);
 812                                 ret = down_trylock(sem);
 813                         }
 814
 815                         if (ret != 0)
 816                                 status = AE_TIME;
 817                 }
 818                 break;
 819         }
 820
 821         if (ACPI_FAILURE(status)) {
 822                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 823                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 824                                   handle, units, timeout,
 825                                   acpi_format_exception(status)));
 826         } else {
 827                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 828                                   "Acquired semaphore[%p|%d|%d]", handle,
 829                                   units, timeout));
 830         }
 831
 832         return status;
 833 }
 834
 835 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 836
 837 /*
 838  * TODO: Support for units > 1?
 839  */
 840 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 841 {
 842         struct semaphore *sem = (struct semaphore *)handle;
 843
 844
 845         if (!sem || (units < 1))
 846                 return AE_BAD_PARAMETER;
 847
 848         if (units > 1)
 849                 return AE_SUPPORT;
 850
 851         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 852                           units));
 853
 854         up(sem);
 855
 856         return AE_OK;
 857 }
 858
 859 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 860
 861 #ifdef ACPI_FUTURE_USAGE
 862 u32 acpi_os_get_line(char *buffer)
 863 {
 864
 865 #ifdef ENABLE_DEBUGGER
 866         if (acpi_in_debugger) {
 867                 u32 chars;
 868
 869                 kdb_read(buffer, sizeof(line_buf));
 870
 871                 /* remove the CR kdb includes */
 872                 chars = strlen(buffer) - 1;
 873                 buffer[chars] = '\0';
 874         }
 875 #endif
 876
 877         return 0;
 878 }
 879 #endif                          /*  ACPI_FUTURE_USAGE  */
 880
 881 /* Assumes no unreadable holes inbetween */
 882 u8 acpi_os_readable(void *ptr, acpi_size len)
 883 {
 884 #if defined(__i386__) || defined(__x86_64__)
 885         char tmp;
 886         return !__get_user(tmp, (char __user *)ptr)
 887             && !__get_user(tmp, (char __user *)ptr + len - 1);
 888 #endif
 889         return 1;
 890 }
 891
 892 #ifdef ACPI_FUTURE_USAGE
 893 u8 acpi_os_writable(void *ptr, acpi_size len)
 894 {
 895         /* could do dummy write (racy) or a kernel page table lookup.
 896            The later may be difficult at early boot when kmap doesn't work yet. */
 897         return 1;
 898 }
 899 #endif
 900
 901 acpi_status acpi_os_signal(u32 function, void *info)
 902 {
 903         switch (function) {
 904         case ACPI_SIGNAL_FATAL:
 905                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 906                 break;
 907         case ACPI_SIGNAL_BREAKPOINT:
 908                 /*
 909                  * AML Breakpoint
 910                  * ACPI spec. says to treat it as a NOP unless
 911                  * you are debugging.  So if/when we integrate
 912                  * AML debugger into the kernel debugger its
 913                  * hook will go here.  But until then it is
 914                  * not useful to print anything on breakpoints.
 915                  */
 916                 break;
 917         default:
 918                 break;
 919         }
 920
 921         return AE_OK;
 922 }
 923
 924 EXPORT_SYMBOL(acpi_os_signal);
 925
 926 static int __init acpi_os_name_setup(char *str)
 927 {
 928         char *p = acpi_os_name;
 929         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 930
 931         if (!str || !*str)
 932                 return 0;
 933
 934         for (; count-- && str && *str; str++) {
 935                 if (isalnum(*str) || *str == ' ' || *str == ':')
 936                         *p++ = *str;
 937                 else if (*str == '\'' || *str == '"')
 938                         continue;
 939                 else
 940                         break;
 941         }
 942         *p = 0;
 943
 944         return 1;
 945
 946 }
 947
 948 __setup("acpi_os_name=", acpi_os_name_setup);
 949
 950 /*
 951  * _OSI control
 952  * empty string disables _OSI
 953  * TBD additional string adds to _OSI
 954  */
 955 static int __init acpi_osi_setup(char *str)
 956 {
 957         if (str == NULL || *str == '\0') {
 958                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 959                 acpi_gbl_create_osi_method = FALSE;
 960         } else {
 961                 /* TBD */
 962                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 963                        str);
 964         }
 965
 966         return 1;
 967 }
 968
 969 __setup("acpi_osi=", acpi_osi_setup);
 970
 971 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 972 static int __init acpi_serialize_setup(char *str)
 973 {
 974         printk(KERN_INFO PREFIX "serialize enabled\n");
 975
 976         acpi_gbl_all_methods_serialized = TRUE;
 977
 978         return 1;
 979 }
 980
 981 __setup("acpi_serialize", acpi_serialize_setup);
 982
 983 /*
 984  * Wake and Run-Time GPES are expected to be separate.
 985  * We disable wake-GPEs at run-time to prevent spurious
 986  * interrupts.
 987  *
 988  * However, if a system exists that shares Wake and
 989  * Run-time events on the same GPE this flag is available
 990  * to tell Linux to keep the wake-time GPEs enabled at run-time.
 991  */
 992 static int __init acpi_wake_gpes_always_on_setup(char *str)
 993 {
 994         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
 995
 996         acpi_gbl_leave_wake_gpes_disabled = FALSE;
 997
 998         return 1;
 999 }
1000
1001 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1002
1003 static int __init acpi_hotkey_setup(char *str)
1004 {
1005         acpi_specific_hotkey_enabled = FALSE;
1006         return 1;
1007 }
1008
1009 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
1010
1011 /*
1012  * max_cstate is defined in the base kernel so modules can
1013  * change it w/o depending on the state of the processor module.
1014  */
1015 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1016
1017 EXPORT_SYMBOL(max_cstate);
1018
1019 /*
1020  * Acquire a spinlock.
1021  *
1022  * handle is a pointer to the spinlock_t.
1023  */
1024
1025 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1026 {
1027         acpi_cpu_flags flags;
1028         spin_lock_irqsave(lockp, flags);
1029         return flags;
1030 }
1031
1032 /*
1033  * Release a spinlock. See above.
1034  */
1035
1036 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1037 {
1038         spin_unlock_irqrestore(lockp, flags);
1039 }
1040
1041 #ifndef ACPI_USE_LOCAL_CACHE
1042
1043 /*******************************************************************************
1044  *
1045  * FUNCTION:    acpi_os_create_cache
1046  *
1047  * PARAMETERS:  name      - Ascii name for the cache
1048  *              size      - Size of each cached object
1049  *              depth     - Maximum depth of the cache (in objects) <ignored>
1050  *              cache     - Where the new cache object is returned
1051  *
1052  * RETURN:      status
1053  *
1054  * DESCRIPTION: Create a cache object
1055  *
1056  ******************************************************************************/
1057
1058 acpi_status
1059 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1060 {
1061         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1062         if (cache == NULL)
1063                 return AE_ERROR;
1064         else
1065                 return AE_OK;
1066 }
1067
1068 /*******************************************************************************
1069  *
1070  * FUNCTION:    acpi_os_purge_cache
1071  *
1072  * PARAMETERS:  Cache           - Handle to cache object
1073  *
1074  * RETURN:      Status
1075  *
1076  * DESCRIPTION: Free all objects within the requested cache.
1077  *
1078  ******************************************************************************/
1079
1080 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1081 {
1082         (void)kmem_cache_shrink(cache);
1083         return (AE_OK);
1084 }
1085
1086 /*******************************************************************************
1087  *
1088  * FUNCTION:    acpi_os_delete_cache
1089  *
1090  * PARAMETERS:  Cache           - Handle to cache object
1091  *
1092  * RETURN:      Status
1093  *
1094  * DESCRIPTION: Free all objects within the requested cache and delete the
1095  *              cache object.
1096  *
1097  ******************************************************************************/
1098
1099 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1100 {
1101         (void)kmem_cache_destroy(cache);
1102         return (AE_OK);
1103 }
1104
1105 /*******************************************************************************
1106  *
1107  * FUNCTION:    acpi_os_release_object
1108  *
1109  * PARAMETERS:  Cache       - Handle to cache object
1110  *              Object      - The object to be released
1111  *
1112  * RETURN:      None
1113  *
1114  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1115  *              the object is deleted.
1116  *
1117  ******************************************************************************/
1118
1119 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1120 {
1121         kmem_cache_free(cache, object);
1122         return (AE_OK);
1123 }
1124
1125 /*******************************************************************************
1126  *
1127  * FUNCTION:    acpi_os_acquire_object
1128  *
1129  * PARAMETERS:  Cache           - Handle to cache object
1130  *              ReturnObject    - Where the object is returned
1131  *
1132  * RETURN:      Status
1133  *
1134  * DESCRIPTION: Return a zero-filled object.
1135  *
1136  ******************************************************************************/
1137
1138 void *acpi_os_acquire_object(acpi_cache_t * cache)
1139 {
1140         void *object = kmem_cache_zalloc(cache, GFP_KERNEL);
1141         WARN_ON(!object);
1142         return object;
1143 }
1144
1145 /******************************************************************************
1146  *
1147  * FUNCTION:    acpi_os_validate_interface
1148  *
1149  * PARAMETERS:  interface           - Requested interface to be validated
1150  *
1151  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1152  *
1153  * DESCRIPTION: Match an interface string to the interfaces supported by the
1154  *              host. Strings originate from an AML call to the _OSI method.
1155  *
1156  *****************************************************************************/
1157
1158 acpi_status
1159 acpi_os_validate_interface (char *interface)
1160 {
1161
1162     return AE_SUPPORT;
1163 }
1164
1165
1166 /******************************************************************************
1167  *
1168  * FUNCTION:    acpi_os_validate_address
1169  *
1170  * PARAMETERS:  space_id             - ACPI space ID
1171  *              address             - Physical address
1172  *              length              - Address length
1173  *
1174  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1175  *              should return AE_AML_ILLEGAL_ADDRESS.
1176  *
1177  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1178  *              the addresses accessed by AML operation regions.
1179  *
1180  *****************************************************************************/
1181
1182 acpi_status
1183 acpi_os_validate_address (
1184     u8                   space_id,
1185     acpi_physical_address   address,
1186     acpi_size               length)
1187 {
1188
1189     return AE_OK;
1190 }
1191
1192
1193 #endif