drivers/acpi/osl.c

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