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