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/acpi.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         struct work_struct work;
  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 static void __init acpi_request_region (struct acpi_generic_address *addr,
  80         unsigned int length, char *desc)
  81 {
  82         struct resource *res;
  83
  84         if (!addr->address || !length)
  85                 return;
  86
  87         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  88                 res = request_region(addr->address, length, desc);
  89         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  90                 res = request_mem_region(addr->address, length, desc);
  91 }
  92
  93 static int __init acpi_reserve_resources(void)
  94 {
  95         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
  96                 "ACPI PM1a_EVT_BLK");
  97
  98         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
  99                 "ACPI PM1b_EVT_BLK");
 100
 101         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 102                 "ACPI PM1a_CNT_BLK");
 103
 104         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 105                 "ACPI PM1b_CNT_BLK");
 106
 107         if (acpi_gbl_FADT.pm_timer_length == 4)
 108                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 109
 110         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 111                 "ACPI PM2_CNT_BLK");
 112
 113         /* Length of GPE blocks must be a non-negative multiple of 2 */
 114
 115         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 116                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 117                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 118
 119         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 120                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 121                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 122
 123         return 0;
 124 }
 125 device_initcall(acpi_reserve_resources);
 126
 127 acpi_status acpi_os_initialize(void)
 128 {
 129         return AE_OK;
 130 }
 131
 132 acpi_status acpi_os_initialize1(void)
 133 {
 134         /*
 135          * Initialize PCI configuration space access, as we'll need to access
 136          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 137          */
 138         if (!raw_pci_ops) {
 139                 printk(KERN_ERR PREFIX
 140                        "Access to PCI configuration space unavailable\n");
 141                 return AE_NULL_ENTRY;
 142         }
 143         kacpid_wq = create_singlethread_workqueue("kacpid");
 144         BUG_ON(!kacpid_wq);
 145
 146         return AE_OK;
 147 }
 148
 149 acpi_status acpi_os_terminate(void)
 150 {
 151         if (acpi_irq_handler) {
 152                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 153                                                  acpi_irq_handler);
 154         }
 155
 156         destroy_workqueue(kacpid_wq);
 157
 158         return AE_OK;
 159 }
 160
 161 void acpi_os_printf(const char *fmt, ...)
 162 {
 163         va_list args;
 164         va_start(args, fmt);
 165         acpi_os_vprintf(fmt, args);
 166         va_end(args);
 167 }
 168
 169 EXPORT_SYMBOL(acpi_os_printf);
 170
 171 void acpi_os_vprintf(const char *fmt, va_list args)
 172 {
 173         static char buffer[512];
 174
 175         vsprintf(buffer, fmt, args);
 176
 177 #ifdef ENABLE_DEBUGGER
 178         if (acpi_in_debugger) {
 179                 kdb_printf("%s", buffer);
 180         } else {
 181                 printk("%s", buffer);
 182         }
 183 #else
 184         printk("%s", buffer);
 185 #endif
 186 }
 187
 188 acpi_physical_address __init acpi_os_get_root_pointer(void)
 189 {
 190         if (efi_enabled) {
 191                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 192                         return efi.acpi20;
 193                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 194                         return efi.acpi;
 195                 else {
 196                         printk(KERN_ERR PREFIX
 197                                "System description tables not found\n");
 198                         return 0;
 199                 }
 200         } else
 201                 return acpi_find_rsdp();
 202 }
 203
 204 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 205 {
 206         if (phys > ULONG_MAX) {
 207                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 208                 return 0;
 209         }
 210         if (acpi_gbl_permanent_mmap)
 211                 /*
 212                 * ioremap checks to ensure this is in reserved space
 213                 */
 214                 return ioremap((unsigned long)phys, size);
 215         else
 216                 return __acpi_map_table((unsigned long)phys, size);
 217 }
 218 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 219
 220 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 221 {
 222         if (acpi_gbl_permanent_mmap) {
 223                 iounmap(virt);
 224         }
 225 }
 226 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 227
 228 #ifdef ACPI_FUTURE_USAGE
 229 acpi_status
 230 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 231 {
 232         if (!phys || !virt)
 233                 return AE_BAD_PARAMETER;
 234
 235         *phys = virt_to_phys(virt);
 236
 237         return AE_OK;
 238 }
 239 #endif
 240
 241 #define ACPI_MAX_OVERRIDE_LEN 100
 242
 243 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 244
 245 acpi_status
 246 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 247                             acpi_string * new_val)
 248 {
 249         if (!init_val || !new_val)
 250                 return AE_BAD_PARAMETER;
 251
 252         *new_val = NULL;
 253         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 254                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 255                        acpi_os_name);
 256                 *new_val = acpi_os_name;
 257         }
 258
 259         return AE_OK;
 260 }
 261
 262 acpi_status
 263 acpi_os_table_override(struct acpi_table_header * existing_table,
 264                        struct acpi_table_header ** new_table)
 265 {
 266         if (!existing_table || !new_table)
 267                 return AE_BAD_PARAMETER;
 268
 269 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 270         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 271                 *new_table = (struct acpi_table_header *)AmlCode;
 272         else
 273                 *new_table = NULL;
 274 #else
 275         *new_table = NULL;
 276 #endif
 277         return AE_OK;
 278 }
 279
 280 static irqreturn_t acpi_irq(int irq, void *dev_id)
 281 {
 282         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 283 }
 284
 285 acpi_status
 286 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 287                                   void *context)
 288 {
 289         unsigned int irq;
 290
 291         /*
 292          * Ignore the GSI from the core, and use the value in our copy of the
 293          * FADT. It may not be the same if an interrupt source override exists
 294          * for the SCI.
 295          */
 296         gsi = acpi_gbl_FADT.sci_interrupt;
 297         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 298                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 299                        gsi);
 300                 return AE_OK;
 301         }
 302
 303         acpi_irq_handler = handler;
 304         acpi_irq_context = context;
 305         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 306                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 307                 return AE_NOT_ACQUIRED;
 308         }
 309         acpi_irq_irq = irq;
 310
 311         return AE_OK;
 312 }
 313
 314 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 315 {
 316         if (irq) {
 317                 free_irq(irq, acpi_irq);
 318                 acpi_irq_handler = NULL;
 319                 acpi_irq_irq = 0;
 320         }
 321
 322         return AE_OK;
 323 }
 324
 325 /*
 326  * Running in interpreter thread context, safe to sleep
 327  */
 328
 329 void acpi_os_sleep(acpi_integer ms)
 330 {
 331         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 332 }
 333
 334 EXPORT_SYMBOL(acpi_os_sleep);
 335
 336 void acpi_os_stall(u32 us)
 337 {
 338         while (us) {
 339                 u32 delay = 1000;
 340
 341                 if (delay > us)
 342                         delay = us;
 343                 udelay(delay);
 344                 touch_nmi_watchdog();
 345                 us -= delay;
 346         }
 347 }
 348
 349 EXPORT_SYMBOL(acpi_os_stall);
 350
 351 /*
 352  * Support ACPI 3.0 AML Timer operand
 353  * Returns 64-bit free-running, monotonically increasing timer
 354  * with 100ns granularity
 355  */
 356 u64 acpi_os_get_timer(void)
 357 {
 358         static u64 t;
 359
 360 #ifdef  CONFIG_HPET
 361         /* TBD: use HPET if available */
 362 #endif
 363
 364 #ifdef  CONFIG_X86_PM_TIMER
 365         /* TBD: default to PM timer if HPET was not available */
 366 #endif
 367         if (!t)
 368                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 369
 370         return ++t;
 371 }
 372
 373 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 374 {
 375         u32 dummy;
 376
 377         if (!value)
 378                 value = &dummy;
 379
 380         switch (width) {
 381         case 8:
 382                 *(u8 *) value = inb(port);
 383                 break;
 384         case 16:
 385                 *(u16 *) value = inw(port);
 386                 break;
 387         case 32:
 388                 *(u32 *) value = inl(port);
 389                 break;
 390         default:
 391                 BUG();
 392         }
 393
 394         return AE_OK;
 395 }
 396
 397 EXPORT_SYMBOL(acpi_os_read_port);
 398
 399 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 400 {
 401         switch (width) {
 402         case 8:
 403                 outb(value, port);
 404                 break;
 405         case 16:
 406                 outw(value, port);
 407                 break;
 408         case 32:
 409                 outl(value, port);
 410                 break;
 411         default:
 412                 BUG();
 413         }
 414
 415         return AE_OK;
 416 }
 417
 418 EXPORT_SYMBOL(acpi_os_write_port);
 419
 420 acpi_status
 421 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 422 {
 423         u32 dummy;
 424         void __iomem *virt_addr;
 425
 426         virt_addr = ioremap(phys_addr, width);
 427         if (!value)
 428                 value = &dummy;
 429
 430         switch (width) {
 431         case 8:
 432                 *(u8 *) value = readb(virt_addr);
 433                 break;
 434         case 16:
 435                 *(u16 *) value = readw(virt_addr);
 436                 break;
 437         case 32:
 438                 *(u32 *) value = readl(virt_addr);
 439                 break;
 440         default:
 441                 BUG();
 442         }
 443
 444         iounmap(virt_addr);
 445
 446         return AE_OK;
 447 }
 448
 449 acpi_status
 450 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 451 {
 452         void __iomem *virt_addr;
 453
 454         virt_addr = ioremap(phys_addr, width);
 455
 456         switch (width) {
 457         case 8:
 458                 writeb(value, virt_addr);
 459                 break;
 460         case 16:
 461                 writew(value, virt_addr);
 462                 break;
 463         case 32:
 464                 writel(value, virt_addr);
 465                 break;
 466         default:
 467                 BUG();
 468         }
 469
 470         iounmap(virt_addr);
 471
 472         return AE_OK;
 473 }
 474
 475 acpi_status
 476 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 477                                void *value, u32 width)
 478 {
 479         int result, size;
 480
 481         if (!value)
 482                 return AE_BAD_PARAMETER;
 483
 484         switch (width) {
 485         case 8:
 486                 size = 1;
 487                 break;
 488         case 16:
 489                 size = 2;
 490                 break;
 491         case 32:
 492                 size = 4;
 493                 break;
 494         default:
 495                 return AE_ERROR;
 496         }
 497
 498         BUG_ON(!raw_pci_ops);
 499
 500         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 501                                    PCI_DEVFN(pci_id->device, pci_id->function),
 502                                    reg, size, value);
 503
 504         return (result ? AE_ERROR : AE_OK);
 505 }
 506
 507 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 508
 509 acpi_status
 510 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 511                                 acpi_integer value, u32 width)
 512 {
 513         int result, size;
 514
 515         switch (width) {
 516         case 8:
 517                 size = 1;
 518                 break;
 519         case 16:
 520                 size = 2;
 521                 break;
 522         case 32:
 523                 size = 4;
 524                 break;
 525         default:
 526                 return AE_ERROR;
 527         }
 528
 529         BUG_ON(!raw_pci_ops);
 530
 531         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 532                                     PCI_DEVFN(pci_id->device, pci_id->function),
 533                                     reg, size, value);
 534
 535         return (result ? AE_ERROR : AE_OK);
 536 }
 537
 538 /* TODO: Change code to take advantage of driver model more */
 539 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 540                                     acpi_handle chandle,        /* current node */
 541                                     struct acpi_pci_id **id,
 542                                     int *is_bridge, u8 * bus_number)
 543 {
 544         acpi_handle handle;
 545         struct acpi_pci_id *pci_id = *id;
 546         acpi_status status;
 547         unsigned long temp;
 548         acpi_object_type type;
 549         u8 tu8;
 550
 551         acpi_get_parent(chandle, &handle);
 552         if (handle != rhandle) {
 553                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 554                                         bus_number);
 555
 556                 status = acpi_get_type(handle, &type);
 557                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 558                         return;
 559
 560                 status =
 561                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 562                                           &temp);
 563                 if (ACPI_SUCCESS(status)) {
 564                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 565                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 566
 567                         if (*is_bridge)
 568                                 pci_id->bus = *bus_number;
 569
 570                         /* any nicer way to get bus number of bridge ? */
 571                         status =
 572                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 573                                                            8);
 574                         if (ACPI_SUCCESS(status)
 575                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 576                                 status =
 577                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 578                                                                    &tu8, 8);
 579                                 if (!ACPI_SUCCESS(status)) {
 580                                         /* Certainly broken...  FIX ME */
 581                                         return;
 582                                 }
 583                                 *is_bridge = 1;
 584                                 pci_id->bus = tu8;
 585                                 status =
 586                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 587                                                                    &tu8, 8);
 588                                 if (ACPI_SUCCESS(status)) {
 589                                         *bus_number = tu8;
 590                                 }
 591                         } else
 592                                 *is_bridge = 0;
 593                 }
 594         }
 595 }
 596
 597 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 598                            acpi_handle chandle, /* current node */
 599                            struct acpi_pci_id **id)
 600 {
 601         int is_bridge = 1;
 602         u8 bus_number = (*id)->bus;
 603
 604         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 605 }
 606
 607 static void acpi_os_execute_deferred(struct work_struct *work)
 608 {
 609         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 610
 611         if (!dpc) {
 612                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 613                 return;
 614         }
 615
 616         dpc->function(dpc->context);
 617
 618         kfree(dpc);
 619
 620         return;
 621 }
 622
 623 /*******************************************************************************
 624  *
 625  * FUNCTION:    acpi_os_execute
 626  *
 627  * PARAMETERS:  Type               - Type of the callback
 628  *              Function           - Function to be executed
 629  *              Context            - Function parameters
 630  *
 631  * RETURN:      Status
 632  *
 633  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 634  *              immediately executes function on a separate thread.
 635  *
 636  ******************************************************************************/
 637
 638 acpi_status acpi_os_execute(acpi_execute_type type,
 639                             acpi_osd_exec_callback function, void *context)
 640 {
 641         acpi_status status = AE_OK;
 642         struct acpi_os_dpc *dpc;
 643
 644         ACPI_FUNCTION_TRACE("os_queue_for_execution");
 645
 646         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 647                           "Scheduling function [%p(%p)] for deferred execution.\n",
 648                           function, context));
 649
 650         if (!function)
 651                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 652
 653         /*
 654          * Allocate/initialize DPC structure.  Note that this memory will be
 655          * freed by the callee.  The kernel handles the work_struct list  in a
 656          * way that allows us to also free its memory inside the callee.
 657          * Because we may want to schedule several tasks with different
 658          * parameters we can't use the approach some kernel code uses of
 659          * having a static work_struct.
 660          */
 661
 662         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 663         if (!dpc)
 664                 return_ACPI_STATUS(AE_NO_MEMORY);
 665
 666         dpc->function = function;
 667         dpc->context = context;
 668
 669         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 670         if (!queue_work(kacpid_wq, &dpc->work)) {
 671                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 672                                   "Call to queue_work() failed.\n"));
 673                 kfree(dpc);
 674                 status = AE_ERROR;
 675         }
 676
 677         return_ACPI_STATUS(status);
 678 }
 679
 680 EXPORT_SYMBOL(acpi_os_execute);
 681
 682 void acpi_os_wait_events_complete(void *context)
 683 {
 684         flush_workqueue(kacpid_wq);
 685 }
 686
 687 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 688
 689 /*
 690  * Allocate the memory for a spinlock and initialize it.
 691  */
 692 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 693 {
 694         spin_lock_init(*handle);
 695
 696         return AE_OK;
 697 }
 698
 699 /*
 700  * Deallocate the memory for a spinlock.
 701  */
 702 void acpi_os_delete_lock(acpi_spinlock handle)
 703 {
 704         return;
 705 }
 706
 707 acpi_status
 708 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 709 {
 710         struct semaphore *sem = NULL;
 711
 712
 713         sem = acpi_os_allocate(sizeof(struct semaphore));
 714         if (!sem)
 715                 return AE_NO_MEMORY;
 716         memset(sem, 0, sizeof(struct semaphore));
 717
 718         sema_init(sem, initial_units);
 719
 720         *handle = (acpi_handle *) sem;
 721
 722         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 723                           *handle, initial_units));
 724
 725         return AE_OK;
 726 }
 727
 728 EXPORT_SYMBOL(acpi_os_create_semaphore);
 729
 730 /*
 731  * TODO: A better way to delete semaphores?  Linux doesn't have a
 732  * 'delete_semaphore()' function -- may result in an invalid
 733  * pointer dereference for non-synchronized consumers.  Should
 734  * we at least check for blocked threads and signal/cancel them?
 735  */
 736
 737 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 738 {
 739         struct semaphore *sem = (struct semaphore *)handle;
 740
 741
 742         if (!sem)
 743                 return AE_BAD_PARAMETER;
 744
 745         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 746
 747         kfree(sem);
 748         sem = NULL;
 749
 750         return AE_OK;
 751 }
 752
 753 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 754
 755 /*
 756  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 757  * improvise.  The process is to sleep for one scheduler quantum
 758  * until the semaphore becomes available.  Downside is that this
 759  * may result in starvation for timeout-based waits when there's
 760  * lots of semaphore activity.
 761  *
 762  * TODO: Support for units > 1?
 763  */
 764 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 765 {
 766         acpi_status status = AE_OK;
 767         struct semaphore *sem = (struct semaphore *)handle;
 768         int ret = 0;
 769
 770
 771         if (!sem || (units < 1))
 772                 return AE_BAD_PARAMETER;
 773
 774         if (units > 1)
 775                 return AE_SUPPORT;
 776
 777         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 778                           handle, units, timeout));
 779
 780         /*
 781          * This can be called during resume with interrupts off.
 782          * Like boot-time, we should be single threaded and will
 783          * always get the lock if we try -- timeout or not.
 784          * If this doesn't succeed, then we will oops courtesy of
 785          * might_sleep() in down().
 786          */
 787         if (!down_trylock(sem))
 788                 return AE_OK;
 789
 790         switch (timeout) {
 791                 /*
 792                  * No Wait:
 793                  * --------
 794                  * A zero timeout value indicates that we shouldn't wait - just
 795                  * acquire the semaphore if available otherwise return AE_TIME
 796                  * (a.k.a. 'would block').
 797                  */
 798         case 0:
 799                 if (down_trylock(sem))
 800                         status = AE_TIME;
 801                 break;
 802
 803                 /*
 804                  * Wait Indefinitely:
 805                  * ------------------
 806                  */
 807         case ACPI_WAIT_FOREVER:
 808                 down(sem);
 809                 break;
 810
 811                 /*
 812                  * Wait w/ Timeout:
 813                  * ----------------
 814                  */
 815         default:
 816                 // TODO: A better timeout algorithm?
 817                 {
 818                         int i = 0;
 819                         static const int quantum_ms = 1000 / HZ;
 820
 821                         ret = down_trylock(sem);
 822                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 823                                 schedule_timeout_interruptible(1);
 824                                 ret = down_trylock(sem);
 825                         }
 826
 827                         if (ret != 0)
 828                                 status = AE_TIME;
 829                 }
 830                 break;
 831         }
 832
 833         if (ACPI_FAILURE(status)) {
 834                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 835                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 836                                   handle, units, timeout,
 837                                   acpi_format_exception(status)));
 838         } else {
 839                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 840                                   "Acquired semaphore[%p|%d|%d]", handle,
 841                                   units, timeout));
 842         }
 843
 844         return status;
 845 }
 846
 847 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 848
 849 /*
 850  * TODO: Support for units > 1?
 851  */
 852 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 853 {
 854         struct semaphore *sem = (struct semaphore *)handle;
 855
 856
 857         if (!sem || (units < 1))
 858                 return AE_BAD_PARAMETER;
 859
 860         if (units > 1)
 861                 return AE_SUPPORT;
 862
 863         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 864                           units));
 865
 866         up(sem);
 867
 868         return AE_OK;
 869 }
 870
 871 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 872
 873 #ifdef ACPI_FUTURE_USAGE
 874 u32 acpi_os_get_line(char *buffer)
 875 {
 876
 877 #ifdef ENABLE_DEBUGGER
 878         if (acpi_in_debugger) {
 879                 u32 chars;
 880
 881                 kdb_read(buffer, sizeof(line_buf));
 882
 883                 /* remove the CR kdb includes */
 884                 chars = strlen(buffer) - 1;
 885                 buffer[chars] = '\0';
 886         }
 887 #endif
 888
 889         return 0;
 890 }
 891 #endif                          /*  ACPI_FUTURE_USAGE  */
 892
 893 /* Assumes no unreadable holes inbetween */
 894 u8 acpi_os_readable(void *ptr, acpi_size len)
 895 {
 896 #if defined(__i386__) || defined(__x86_64__)
 897         char tmp;
 898         return !__get_user(tmp, (char __user *)ptr)
 899             && !__get_user(tmp, (char __user *)ptr + len - 1);
 900 #endif
 901         return 1;
 902 }
 903
 904 #ifdef ACPI_FUTURE_USAGE
 905 u8 acpi_os_writable(void *ptr, acpi_size len)
 906 {
 907         /* could do dummy write (racy) or a kernel page table lookup.
 908            The later may be difficult at early boot when kmap doesn't work yet. */
 909         return 1;
 910 }
 911 #endif
 912
 913 acpi_status acpi_os_signal(u32 function, void *info)
 914 {
 915         switch (function) {
 916         case ACPI_SIGNAL_FATAL:
 917                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 918                 break;
 919         case ACPI_SIGNAL_BREAKPOINT:
 920                 /*
 921                  * AML Breakpoint
 922                  * ACPI spec. says to treat it as a NOP unless
 923                  * you are debugging.  So if/when we integrate
 924                  * AML debugger into the kernel debugger its
 925                  * hook will go here.  But until then it is
 926                  * not useful to print anything on breakpoints.
 927                  */
 928                 break;
 929         default:
 930                 break;
 931         }
 932
 933         return AE_OK;
 934 }
 935
 936 EXPORT_SYMBOL(acpi_os_signal);
 937
 938 static int __init acpi_os_name_setup(char *str)
 939 {
 940         char *p = acpi_os_name;
 941         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 942
 943         if (!str || !*str)
 944                 return 0;
 945
 946         for (; count-- && str && *str; str++) {
 947                 if (isalnum(*str) || *str == ' ' || *str == ':')
 948                         *p++ = *str;
 949                 else if (*str == '\'' || *str == '"')
 950                         continue;
 951                 else
 952                         break;
 953         }
 954         *p = 0;
 955
 956         return 1;
 957
 958 }
 959
 960 __setup("acpi_os_name=", acpi_os_name_setup);
 961
 962 /*
 963  * _OSI control
 964  * empty string disables _OSI
 965  * TBD additional string adds to _OSI
 966  */
 967 static int __init acpi_osi_setup(char *str)
 968 {
 969         if (str == NULL || *str == '\0') {
 970                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 971                 acpi_gbl_create_osi_method = FALSE;
 972         } else {
 973                 /* TBD */
 974                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 975                        str);
 976         }
 977
 978         return 1;
 979 }
 980
 981 __setup("acpi_osi=", acpi_osi_setup);
 982
 983 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 984 static int __init acpi_serialize_setup(char *str)
 985 {
 986         printk(KERN_INFO PREFIX "serialize enabled\n");
 987
 988         acpi_gbl_all_methods_serialized = TRUE;
 989
 990         return 1;
 991 }
 992
 993 __setup("acpi_serialize", acpi_serialize_setup);
 994
 995 /*
 996  * Wake and Run-Time GPES are expected to be separate.
 997  * We disable wake-GPEs at run-time to prevent spurious
 998  * interrupts.
 999  *
1000  * However, if a system exists that shares Wake and
1001  * Run-time events on the same GPE this flag is available
1002  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1003  */
1004 static int __init acpi_wake_gpes_always_on_setup(char *str)
1005 {
1006         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1007
1008         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1009
1010         return 1;
1011 }
1012
1013 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1014
1015 static int __init acpi_hotkey_setup(char *str)
1016 {
1017         acpi_specific_hotkey_enabled = FALSE;
1018         return 1;
1019 }
1020
1021 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
1022
1023 /*
1024  * max_cstate is defined in the base kernel so modules can
1025  * change it w/o depending on the state of the processor module.
1026  */
1027 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1028
1029 EXPORT_SYMBOL(max_cstate);
1030
1031 /*
1032  * Acquire a spinlock.
1033  *
1034  * handle is a pointer to the spinlock_t.
1035  */
1036
1037 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1038 {
1039         acpi_cpu_flags flags;
1040         spin_lock_irqsave(lockp, flags);
1041         return flags;
1042 }
1043
1044 /*
1045  * Release a spinlock. See above.
1046  */
1047
1048 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1049 {
1050         spin_unlock_irqrestore(lockp, flags);
1051 }
1052
1053 #ifndef ACPI_USE_LOCAL_CACHE
1054
1055 /*******************************************************************************
1056  *
1057  * FUNCTION:    acpi_os_create_cache
1058  *
1059  * PARAMETERS:  name      - Ascii name for the cache
1060  *              size      - Size of each cached object
1061  *              depth     - Maximum depth of the cache (in objects) <ignored>
1062  *              cache     - Where the new cache object is returned
1063  *
1064  * RETURN:      status
1065  *
1066  * DESCRIPTION: Create a cache object
1067  *
1068  ******************************************************************************/
1069
1070 acpi_status
1071 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1072 {
1073         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1074         if (*cache == NULL)
1075                 return AE_ERROR;
1076         else
1077                 return AE_OK;
1078 }
1079
1080 /*******************************************************************************
1081  *
1082  * FUNCTION:    acpi_os_purge_cache
1083  *
1084  * PARAMETERS:  Cache           - Handle to cache object
1085  *
1086  * RETURN:      Status
1087  *
1088  * DESCRIPTION: Free all objects within the requested cache.
1089  *
1090  ******************************************************************************/
1091
1092 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1093 {
1094         kmem_cache_shrink(cache);
1095         return (AE_OK);
1096 }
1097
1098 /*******************************************************************************
1099  *
1100  * FUNCTION:    acpi_os_delete_cache
1101  *
1102  * PARAMETERS:  Cache           - Handle to cache object
1103  *
1104  * RETURN:      Status
1105  *
1106  * DESCRIPTION: Free all objects within the requested cache and delete the
1107  *              cache object.
1108  *
1109  ******************************************************************************/
1110
1111 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1112 {
1113         kmem_cache_destroy(cache);
1114         return (AE_OK);
1115 }
1116
1117 /*******************************************************************************
1118  *
1119  * FUNCTION:    acpi_os_release_object
1120  *
1121  * PARAMETERS:  Cache       - Handle to cache object
1122  *              Object      - The object to be released
1123  *
1124  * RETURN:      None
1125  *
1126  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1127  *              the object is deleted.
1128  *
1129  ******************************************************************************/
1130
1131 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1132 {
1133         kmem_cache_free(cache, object);
1134         return (AE_OK);
1135 }
1136
1137 /******************************************************************************
1138  *
1139  * FUNCTION:    acpi_os_validate_interface
1140  *
1141  * PARAMETERS:  interface           - Requested interface to be validated
1142  *
1143  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1144  *
1145  * DESCRIPTION: Match an interface string to the interfaces supported by the
1146  *              host. Strings originate from an AML call to the _OSI method.
1147  *
1148  *****************************************************************************/
1149
1150 acpi_status
1151 acpi_os_validate_interface (char *interface)
1152 {
1153
1154     return AE_SUPPORT;
1155 }
1156
1157
1158 /******************************************************************************
1159  *
1160  * FUNCTION:    acpi_os_validate_address
1161  *
1162  * PARAMETERS:  space_id             - ACPI space ID
1163  *              address             - Physical address
1164  *              length              - Address length
1165  *
1166  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1167  *              should return AE_AML_ILLEGAL_ADDRESS.
1168  *
1169  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1170  *              the addresses accessed by AML operation regions.
1171  *
1172  *****************************************************************************/
1173
1174 acpi_status
1175 acpi_os_validate_address (
1176     u8                   space_id,
1177     acpi_physical_address   address,
1178     acpi_size               length)
1179 {
1180
1181     return AE_OK;
1182 }
1183
1184
1185 #endif