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 static unsigned int acpi_irq_irq;
  72 static acpi_osd_handler acpi_irq_handler;
  73 static void *acpi_irq_context;
  74 static struct workqueue_struct *kacpid_wq;
  75
  76 static void __init acpi_request_region (struct acpi_generic_address *addr,
  77         unsigned int length, char *desc)
  78 {
  79         struct resource *res;
  80
  81         if (!addr->address || !length)
  82                 return;
  83
  84         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  85                 res = request_region(addr->address, length, desc);
  86         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  87                 res = request_mem_region(addr->address, length, desc);
  88 }
  89
  90 static int __init acpi_reserve_resources(void)
  91 {
  92         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
  93                 "ACPI PM1a_EVT_BLK");
  94
  95         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
  96                 "ACPI PM1b_EVT_BLK");
  97
  98         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
  99                 "ACPI PM1a_CNT_BLK");
 100
 101         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 102                 "ACPI PM1b_CNT_BLK");
 103
 104         if (acpi_gbl_FADT.pm_timer_length == 4)
 105                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 106
 107         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 108                 "ACPI PM2_CNT_BLK");
 109
 110         /* Length of GPE blocks must be a non-negative multiple of 2 */
 111
 112         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 113                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 114                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 115
 116         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 117                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 118                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 119
 120         return 0;
 121 }
 122 device_initcall(acpi_reserve_resources);
 123
 124 acpi_status acpi_os_initialize(void)
 125 {
 126         return AE_OK;
 127 }
 128
 129 acpi_status acpi_os_initialize1(void)
 130 {
 131         /*
 132          * Initialize PCI configuration space access, as we'll need to access
 133          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 134          */
 135         if (!raw_pci_ops) {
 136                 printk(KERN_ERR PREFIX
 137                        "Access to PCI configuration space unavailable\n");
 138                 return AE_NULL_ENTRY;
 139         }
 140         kacpid_wq = create_singlethread_workqueue("kacpid");
 141         BUG_ON(!kacpid_wq);
 142
 143         return AE_OK;
 144 }
 145
 146 acpi_status acpi_os_terminate(void)
 147 {
 148         if (acpi_irq_handler) {
 149                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 150                                                  acpi_irq_handler);
 151         }
 152
 153         destroy_workqueue(kacpid_wq);
 154
 155         return AE_OK;
 156 }
 157
 158 void acpi_os_printf(const char *fmt, ...)
 159 {
 160         va_list args;
 161         va_start(args, fmt);
 162         acpi_os_vprintf(fmt, args);
 163         va_end(args);
 164 }
 165
 166 EXPORT_SYMBOL(acpi_os_printf);
 167
 168 void acpi_os_vprintf(const char *fmt, va_list args)
 169 {
 170         static char buffer[512];
 171
 172         vsprintf(buffer, fmt, args);
 173
 174 #ifdef ENABLE_DEBUGGER
 175         if (acpi_in_debugger) {
 176                 kdb_printf("%s", buffer);
 177         } else {
 178                 printk("%s", buffer);
 179         }
 180 #else
 181         printk("%s", buffer);
 182 #endif
 183 }
 184
 185 acpi_physical_address __init acpi_os_get_root_pointer(void)
 186 {
 187         if (efi_enabled) {
 188                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 189                         return efi.acpi20;
 190                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 191                         return efi.acpi;
 192                 else {
 193                         printk(KERN_ERR PREFIX
 194                                "System description tables not found\n");
 195                         return 0;
 196                 }
 197         } else
 198                 return acpi_find_rsdp();
 199 }
 200
 201 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 202 {
 203         if (phys > ULONG_MAX) {
 204                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 205                 return NULL;
 206         }
 207         if (acpi_gbl_permanent_mmap)
 208                 /*
 209                 * ioremap checks to ensure this is in reserved space
 210                 */
 211                 return ioremap((unsigned long)phys, size);
 212         else
 213                 return __acpi_map_table((unsigned long)phys, size);
 214 }
 215 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 216
 217 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 218 {
 219         if (acpi_gbl_permanent_mmap) {
 220                 iounmap(virt);
 221         }
 222 }
 223 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 224
 225 #ifdef ACPI_FUTURE_USAGE
 226 acpi_status
 227 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 228 {
 229         if (!phys || !virt)
 230                 return AE_BAD_PARAMETER;
 231
 232         *phys = virt_to_phys(virt);
 233
 234         return AE_OK;
 235 }
 236 #endif
 237
 238 #define ACPI_MAX_OVERRIDE_LEN 100
 239
 240 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 241
 242 acpi_status
 243 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 244                             acpi_string * new_val)
 245 {
 246         if (!init_val || !new_val)
 247                 return AE_BAD_PARAMETER;
 248
 249         *new_val = NULL;
 250         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 251                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 252                        acpi_os_name);
 253                 *new_val = acpi_os_name;
 254         }
 255
 256         return AE_OK;
 257 }
 258
 259 acpi_status
 260 acpi_os_table_override(struct acpi_table_header * existing_table,
 261                        struct acpi_table_header ** new_table)
 262 {
 263         if (!existing_table || !new_table)
 264                 return AE_BAD_PARAMETER;
 265
 266 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 267         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 268                 *new_table = (struct acpi_table_header *)AmlCode;
 269         else
 270                 *new_table = NULL;
 271 #else
 272         *new_table = NULL;
 273 #endif
 274         return AE_OK;
 275 }
 276
 277 static irqreturn_t acpi_irq(int irq, void *dev_id)
 278 {
 279         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 280 }
 281
 282 acpi_status
 283 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 284                                   void *context)
 285 {
 286         unsigned int irq;
 287
 288         /*
 289          * Ignore the GSI from the core, and use the value in our copy of the
 290          * FADT. It may not be the same if an interrupt source override exists
 291          * for the SCI.
 292          */
 293         gsi = acpi_gbl_FADT.sci_interrupt;
 294         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 295                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 296                        gsi);
 297                 return AE_OK;
 298         }
 299
 300         acpi_irq_handler = handler;
 301         acpi_irq_context = context;
 302         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 303                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 304                 return AE_NOT_ACQUIRED;
 305         }
 306         acpi_irq_irq = irq;
 307
 308         return AE_OK;
 309 }
 310
 311 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 312 {
 313         if (irq) {
 314                 free_irq(irq, acpi_irq);
 315                 acpi_irq_handler = NULL;
 316                 acpi_irq_irq = 0;
 317         }
 318
 319         return AE_OK;
 320 }
 321
 322 /*
 323  * Running in interpreter thread context, safe to sleep
 324  */
 325
 326 void acpi_os_sleep(acpi_integer ms)
 327 {
 328         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 329 }
 330
 331 EXPORT_SYMBOL(acpi_os_sleep);
 332
 333 void acpi_os_stall(u32 us)
 334 {
 335         while (us) {
 336                 u32 delay = 1000;
 337
 338                 if (delay > us)
 339                         delay = us;
 340                 udelay(delay);
 341                 touch_nmi_watchdog();
 342                 us -= delay;
 343         }
 344 }
 345
 346 EXPORT_SYMBOL(acpi_os_stall);
 347
 348 /*
 349  * Support ACPI 3.0 AML Timer operand
 350  * Returns 64-bit free-running, monotonically increasing timer
 351  * with 100ns granularity
 352  */
 353 u64 acpi_os_get_timer(void)
 354 {
 355         static u64 t;
 356
 357 #ifdef  CONFIG_HPET
 358         /* TBD: use HPET if available */
 359 #endif
 360
 361 #ifdef  CONFIG_X86_PM_TIMER
 362         /* TBD: default to PM timer if HPET was not available */
 363 #endif
 364         if (!t)
 365                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 366
 367         return ++t;
 368 }
 369
 370 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 371 {
 372         u32 dummy;
 373
 374         if (!value)
 375                 value = &dummy;
 376
 377         switch (width) {
 378         case 8:
 379                 *(u8 *) value = inb(port);
 380                 break;
 381         case 16:
 382                 *(u16 *) value = inw(port);
 383                 break;
 384         case 32:
 385                 *(u32 *) value = inl(port);
 386                 break;
 387         default:
 388                 BUG();
 389         }
 390
 391         return AE_OK;
 392 }
 393
 394 EXPORT_SYMBOL(acpi_os_read_port);
 395
 396 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 397 {
 398         switch (width) {
 399         case 8:
 400                 outb(value, port);
 401                 break;
 402         case 16:
 403                 outw(value, port);
 404                 break;
 405         case 32:
 406                 outl(value, port);
 407                 break;
 408         default:
 409                 BUG();
 410         }
 411
 412         return AE_OK;
 413 }
 414
 415 EXPORT_SYMBOL(acpi_os_write_port);
 416
 417 acpi_status
 418 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 419 {
 420         u32 dummy;
 421         void __iomem *virt_addr;
 422
 423         virt_addr = ioremap(phys_addr, width);
 424         if (!value)
 425                 value = &dummy;
 426
 427         switch (width) {
 428         case 8:
 429                 *(u8 *) value = readb(virt_addr);
 430                 break;
 431         case 16:
 432                 *(u16 *) value = readw(virt_addr);
 433                 break;
 434         case 32:
 435                 *(u32 *) value = readl(virt_addr);
 436                 break;
 437         default:
 438                 BUG();
 439         }
 440
 441         iounmap(virt_addr);
 442
 443         return AE_OK;
 444 }
 445
 446 acpi_status
 447 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 448 {
 449         void __iomem *virt_addr;
 450
 451         virt_addr = ioremap(phys_addr, width);
 452
 453         switch (width) {
 454         case 8:
 455                 writeb(value, virt_addr);
 456                 break;
 457         case 16:
 458                 writew(value, virt_addr);
 459                 break;
 460         case 32:
 461                 writel(value, virt_addr);
 462                 break;
 463         default:
 464                 BUG();
 465         }
 466
 467         iounmap(virt_addr);
 468
 469         return AE_OK;
 470 }
 471
 472 acpi_status
 473 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 474                                void *value, u32 width)
 475 {
 476         int result, size;
 477
 478         if (!value)
 479                 return AE_BAD_PARAMETER;
 480
 481         switch (width) {
 482         case 8:
 483                 size = 1;
 484                 break;
 485         case 16:
 486                 size = 2;
 487                 break;
 488         case 32:
 489                 size = 4;
 490                 break;
 491         default:
 492                 return AE_ERROR;
 493         }
 494
 495         BUG_ON(!raw_pci_ops);
 496
 497         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 498                                    PCI_DEVFN(pci_id->device, pci_id->function),
 499                                    reg, size, value);
 500
 501         return (result ? AE_ERROR : AE_OK);
 502 }
 503
 504 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 505
 506 acpi_status
 507 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 508                                 acpi_integer value, u32 width)
 509 {
 510         int result, size;
 511
 512         switch (width) {
 513         case 8:
 514                 size = 1;
 515                 break;
 516         case 16:
 517                 size = 2;
 518                 break;
 519         case 32:
 520                 size = 4;
 521                 break;
 522         default:
 523                 return AE_ERROR;
 524         }
 525
 526         BUG_ON(!raw_pci_ops);
 527
 528         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 529                                     PCI_DEVFN(pci_id->device, pci_id->function),
 530                                     reg, size, value);
 531
 532         return (result ? AE_ERROR : AE_OK);
 533 }
 534
 535 /* TODO: Change code to take advantage of driver model more */
 536 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 537                                     acpi_handle chandle,        /* current node */
 538                                     struct acpi_pci_id **id,
 539                                     int *is_bridge, u8 * bus_number)
 540 {
 541         acpi_handle handle;
 542         struct acpi_pci_id *pci_id = *id;
 543         acpi_status status;
 544         unsigned long temp;
 545         acpi_object_type type;
 546         u8 tu8;
 547
 548         acpi_get_parent(chandle, &handle);
 549         if (handle != rhandle) {
 550                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 551                                         bus_number);
 552
 553                 status = acpi_get_type(handle, &type);
 554                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 555                         return;
 556
 557                 status =
 558                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 559                                           &temp);
 560                 if (ACPI_SUCCESS(status)) {
 561                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 562                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 563
 564                         if (*is_bridge)
 565                                 pci_id->bus = *bus_number;
 566
 567                         /* any nicer way to get bus number of bridge ? */
 568                         status =
 569                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 570                                                            8);
 571                         if (ACPI_SUCCESS(status)
 572                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 573                                 status =
 574                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 575                                                                    &tu8, 8);
 576                                 if (!ACPI_SUCCESS(status)) {
 577                                         /* Certainly broken...  FIX ME */
 578                                         return;
 579                                 }
 580                                 *is_bridge = 1;
 581                                 pci_id->bus = tu8;
 582                                 status =
 583                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 584                                                                    &tu8, 8);
 585                                 if (ACPI_SUCCESS(status)) {
 586                                         *bus_number = tu8;
 587                                 }
 588                         } else
 589                                 *is_bridge = 0;
 590                 }
 591         }
 592 }
 593
 594 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 595                            acpi_handle chandle, /* current node */
 596                            struct acpi_pci_id **id)
 597 {
 598         int is_bridge = 1;
 599         u8 bus_number = (*id)->bus;
 600
 601         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 602 }
 603
 604 static void acpi_os_execute_deferred(struct work_struct *work)
 605 {
 606         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 607
 608         if (!dpc) {
 609                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 610                 return;
 611         }
 612
 613         dpc->function(dpc->context);
 614
 615         kfree(dpc);
 616
 617         return;
 618 }
 619
 620 /*******************************************************************************
 621  *
 622  * FUNCTION:    acpi_os_execute
 623  *
 624  * PARAMETERS:  Type               - Type of the callback
 625  *              Function           - Function to be executed
 626  *              Context            - Function parameters
 627  *
 628  * RETURN:      Status
 629  *
 630  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 631  *              immediately executes function on a separate thread.
 632  *
 633  ******************************************************************************/
 634
 635 acpi_status acpi_os_execute(acpi_execute_type type,
 636                             acpi_osd_exec_callback function, void *context)
 637 {
 638         acpi_status status = AE_OK;
 639         struct acpi_os_dpc *dpc;
 640
 641         ACPI_FUNCTION_TRACE("os_queue_for_execution");
 642
 643         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 644                           "Scheduling function [%p(%p)] for deferred execution.\n",
 645                           function, context));
 646
 647         if (!function)
 648                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 649
 650         /*
 651          * Allocate/initialize DPC structure.  Note that this memory will be
 652          * freed by the callee.  The kernel handles the work_struct list  in a
 653          * way that allows us to also free its memory inside the callee.
 654          * Because we may want to schedule several tasks with different
 655          * parameters we can't use the approach some kernel code uses of
 656          * having a static work_struct.
 657          */
 658
 659         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 660         if (!dpc)
 661                 return_ACPI_STATUS(AE_NO_MEMORY);
 662
 663         dpc->function = function;
 664         dpc->context = context;
 665
 666         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 667         if (!queue_work(kacpid_wq, &dpc->work)) {
 668                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 669                                   "Call to queue_work() failed.\n"));
 670                 kfree(dpc);
 671                 status = AE_ERROR;
 672         }
 673
 674         return_ACPI_STATUS(status);
 675 }
 676
 677 EXPORT_SYMBOL(acpi_os_execute);
 678
 679 void acpi_os_wait_events_complete(void *context)
 680 {
 681         flush_workqueue(kacpid_wq);
 682 }
 683
 684 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 685
 686 /*
 687  * Allocate the memory for a spinlock and initialize it.
 688  */
 689 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 690 {
 691         spin_lock_init(*handle);
 692
 693         return AE_OK;
 694 }
 695
 696 /*
 697  * Deallocate the memory for a spinlock.
 698  */
 699 void acpi_os_delete_lock(acpi_spinlock handle)
 700 {
 701         return;
 702 }
 703
 704 acpi_status
 705 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 706 {
 707         struct semaphore *sem = NULL;
 708
 709
 710         sem = acpi_os_allocate(sizeof(struct semaphore));
 711         if (!sem)
 712                 return AE_NO_MEMORY;
 713         memset(sem, 0, sizeof(struct semaphore));
 714
 715         sema_init(sem, initial_units);
 716
 717         *handle = (acpi_handle *) sem;
 718
 719         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 720                           *handle, initial_units));
 721
 722         return AE_OK;
 723 }
 724
 725 EXPORT_SYMBOL(acpi_os_create_semaphore);
 726
 727 /*
 728  * TODO: A better way to delete semaphores?  Linux doesn't have a
 729  * 'delete_semaphore()' function -- may result in an invalid
 730  * pointer dereference for non-synchronized consumers.  Should
 731  * we at least check for blocked threads and signal/cancel them?
 732  */
 733
 734 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 735 {
 736         struct semaphore *sem = (struct semaphore *)handle;
 737
 738
 739         if (!sem)
 740                 return AE_BAD_PARAMETER;
 741
 742         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 743
 744         kfree(sem);
 745         sem = NULL;
 746
 747         return AE_OK;
 748 }
 749
 750 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 751
 752 /*
 753  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 754  * improvise.  The process is to sleep for one scheduler quantum
 755  * until the semaphore becomes available.  Downside is that this
 756  * may result in starvation for timeout-based waits when there's
 757  * lots of semaphore activity.
 758  *
 759  * TODO: Support for units > 1?
 760  */
 761 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 762 {
 763         acpi_status status = AE_OK;
 764         struct semaphore *sem = (struct semaphore *)handle;
 765         int ret = 0;
 766
 767
 768         if (!sem || (units < 1))
 769                 return AE_BAD_PARAMETER;
 770
 771         if (units > 1)
 772                 return AE_SUPPORT;
 773
 774         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 775                           handle, units, timeout));
 776
 777         /*
 778          * This can be called during resume with interrupts off.
 779          * Like boot-time, we should be single threaded and will
 780          * always get the lock if we try -- timeout or not.
 781          * If this doesn't succeed, then we will oops courtesy of
 782          * might_sleep() in down().
 783          */
 784         if (!down_trylock(sem))
 785                 return AE_OK;
 786
 787         switch (timeout) {
 788                 /*
 789                  * No Wait:
 790                  * --------
 791                  * A zero timeout value indicates that we shouldn't wait - just
 792                  * acquire the semaphore if available otherwise return AE_TIME
 793                  * (a.k.a. 'would block').
 794                  */
 795         case 0:
 796                 if (down_trylock(sem))
 797                         status = AE_TIME;
 798                 break;
 799
 800                 /*
 801                  * Wait Indefinitely:
 802                  * ------------------
 803                  */
 804         case ACPI_WAIT_FOREVER:
 805                 down(sem);
 806                 break;
 807
 808                 /*
 809                  * Wait w/ Timeout:
 810                  * ----------------
 811                  */
 812         default:
 813                 // TODO: A better timeout algorithm?
 814                 {
 815                         int i = 0;
 816                         static const int quantum_ms = 1000 / HZ;
 817
 818                         ret = down_trylock(sem);
 819                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 820                                 schedule_timeout_interruptible(1);
 821                                 ret = down_trylock(sem);
 822                         }
 823
 824                         if (ret != 0)
 825                                 status = AE_TIME;
 826                 }
 827                 break;
 828         }
 829
 830         if (ACPI_FAILURE(status)) {
 831                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 832                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 833                                   handle, units, timeout,
 834                                   acpi_format_exception(status)));
 835         } else {
 836                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 837                                   "Acquired semaphore[%p|%d|%d]", handle,
 838                                   units, timeout));
 839         }
 840
 841         return status;
 842 }
 843
 844 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 845
 846 /*
 847  * TODO: Support for units > 1?
 848  */
 849 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 850 {
 851         struct semaphore *sem = (struct semaphore *)handle;
 852
 853
 854         if (!sem || (units < 1))
 855                 return AE_BAD_PARAMETER;
 856
 857         if (units > 1)
 858                 return AE_SUPPORT;
 859
 860         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 861                           units));
 862
 863         up(sem);
 864
 865         return AE_OK;
 866 }
 867
 868 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 869
 870 #ifdef ACPI_FUTURE_USAGE
 871 u32 acpi_os_get_line(char *buffer)
 872 {
 873
 874 #ifdef ENABLE_DEBUGGER
 875         if (acpi_in_debugger) {
 876                 u32 chars;
 877
 878                 kdb_read(buffer, sizeof(line_buf));
 879
 880                 /* remove the CR kdb includes */
 881                 chars = strlen(buffer) - 1;
 882                 buffer[chars] = '\0';
 883         }
 884 #endif
 885
 886         return 0;
 887 }
 888 #endif                          /*  ACPI_FUTURE_USAGE  */
 889
 890 acpi_status acpi_os_signal(u32 function, void *info)
 891 {
 892         switch (function) {
 893         case ACPI_SIGNAL_FATAL:
 894                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 895                 break;
 896         case ACPI_SIGNAL_BREAKPOINT:
 897                 /*
 898                  * AML Breakpoint
 899                  * ACPI spec. says to treat it as a NOP unless
 900                  * you are debugging.  So if/when we integrate
 901                  * AML debugger into the kernel debugger its
 902                  * hook will go here.  But until then it is
 903                  * not useful to print anything on breakpoints.
 904                  */
 905                 break;
 906         default:
 907                 break;
 908         }
 909
 910         return AE_OK;
 911 }
 912
 913 EXPORT_SYMBOL(acpi_os_signal);
 914
 915 static int __init acpi_os_name_setup(char *str)
 916 {
 917         char *p = acpi_os_name;
 918         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 919
 920         if (!str || !*str)
 921                 return 0;
 922
 923         for (; count-- && str && *str; str++) {
 924                 if (isalnum(*str) || *str == ' ' || *str == ':')
 925                         *p++ = *str;
 926                 else if (*str == '\'' || *str == '"')
 927                         continue;
 928                 else
 929                         break;
 930         }
 931         *p = 0;
 932
 933         return 1;
 934
 935 }
 936
 937 __setup("acpi_os_name=", acpi_os_name_setup);
 938
 939 /*
 940  * _OSI control
 941  * empty string disables _OSI
 942  * TBD additional string adds to _OSI
 943  */
 944 static int __init acpi_osi_setup(char *str)
 945 {
 946         if (str == NULL || *str == '\0') {
 947                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 948                 acpi_gbl_create_osi_method = FALSE;
 949         } else {
 950                 /* TBD */
 951                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 952                        str);
 953         }
 954
 955         return 1;
 956 }
 957
 958 __setup("acpi_osi=", acpi_osi_setup);
 959
 960 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 961 static int __init acpi_serialize_setup(char *str)
 962 {
 963         printk(KERN_INFO PREFIX "serialize enabled\n");
 964
 965         acpi_gbl_all_methods_serialized = TRUE;
 966
 967         return 1;
 968 }
 969
 970 __setup("acpi_serialize", acpi_serialize_setup);
 971
 972 /*
 973  * Wake and Run-Time GPES are expected to be separate.
 974  * We disable wake-GPEs at run-time to prevent spurious
 975  * interrupts.
 976  *
 977  * However, if a system exists that shares Wake and
 978  * Run-time events on the same GPE this flag is available
 979  * to tell Linux to keep the wake-time GPEs enabled at run-time.
 980  */
 981 static int __init acpi_wake_gpes_always_on_setup(char *str)
 982 {
 983         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
 984
 985         acpi_gbl_leave_wake_gpes_disabled = FALSE;
 986
 987         return 1;
 988 }
 989
 990 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
 991
 992 /*
 993  * max_cstate is defined in the base kernel so modules can
 994  * change it w/o depending on the state of the processor module.
 995  */
 996 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
 997
 998 EXPORT_SYMBOL(max_cstate);
 999
1000 /*
1001  * Acquire a spinlock.
1002  *
1003  * handle is a pointer to the spinlock_t.
1004  */
1005
1006 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1007 {
1008         acpi_cpu_flags flags;
1009         spin_lock_irqsave(lockp, flags);
1010         return flags;
1011 }
1012
1013 /*
1014  * Release a spinlock. See above.
1015  */
1016
1017 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1018 {
1019         spin_unlock_irqrestore(lockp, flags);
1020 }
1021
1022 #ifndef ACPI_USE_LOCAL_CACHE
1023
1024 /*******************************************************************************
1025  *
1026  * FUNCTION:    acpi_os_create_cache
1027  *
1028  * PARAMETERS:  name      - Ascii name for the cache
1029  *              size      - Size of each cached object
1030  *              depth     - Maximum depth of the cache (in objects) <ignored>
1031  *              cache     - Where the new cache object is returned
1032  *
1033  * RETURN:      status
1034  *
1035  * DESCRIPTION: Create a cache object
1036  *
1037  ******************************************************************************/
1038
1039 acpi_status
1040 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1041 {
1042         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1043         if (*cache == NULL)
1044                 return AE_ERROR;
1045         else
1046                 return AE_OK;
1047 }
1048
1049 /*******************************************************************************
1050  *
1051  * FUNCTION:    acpi_os_purge_cache
1052  *
1053  * PARAMETERS:  Cache           - Handle to cache object
1054  *
1055  * RETURN:      Status
1056  *
1057  * DESCRIPTION: Free all objects within the requested cache.
1058  *
1059  ******************************************************************************/
1060
1061 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1062 {
1063         kmem_cache_shrink(cache);
1064         return (AE_OK);
1065 }
1066
1067 /*******************************************************************************
1068  *
1069  * FUNCTION:    acpi_os_delete_cache
1070  *
1071  * PARAMETERS:  Cache           - Handle to cache object
1072  *
1073  * RETURN:      Status
1074  *
1075  * DESCRIPTION: Free all objects within the requested cache and delete the
1076  *              cache object.
1077  *
1078  ******************************************************************************/
1079
1080 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1081 {
1082         kmem_cache_destroy(cache);
1083         return (AE_OK);
1084 }
1085
1086 /*******************************************************************************
1087  *
1088  * FUNCTION:    acpi_os_release_object
1089  *
1090  * PARAMETERS:  Cache       - Handle to cache object
1091  *              Object      - The object to be released
1092  *
1093  * RETURN:      None
1094  *
1095  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1096  *              the object is deleted.
1097  *
1098  ******************************************************************************/
1099
1100 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1101 {
1102         kmem_cache_free(cache, object);
1103         return (AE_OK);
1104 }
1105
1106 /******************************************************************************
1107  *
1108  * FUNCTION:    acpi_os_validate_interface
1109  *
1110  * PARAMETERS:  interface           - Requested interface to be validated
1111  *
1112  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1113  *
1114  * DESCRIPTION: Match an interface string to the interfaces supported by the
1115  *              host. Strings originate from an AML call to the _OSI method.
1116  *
1117  *****************************************************************************/
1118
1119 acpi_status
1120 acpi_os_validate_interface (char *interface)
1121 {
1122
1123     return AE_SUPPORT;
1124 }
1125
1126
1127 /******************************************************************************
1128  *
1129  * FUNCTION:    acpi_os_validate_address
1130  *
1131  * PARAMETERS:  space_id             - ACPI space ID
1132  *              address             - Physical address
1133  *              length              - Address length
1134  *
1135  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1136  *              should return AE_AML_ILLEGAL_ADDRESS.
1137  *
1138  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1139  *              the addresses accessed by AML operation regions.
1140  *
1141  *****************************************************************************/
1142
1143 acpi_status
1144 acpi_os_validate_address (
1145     u8                   space_id,
1146     acpi_physical_address   address,
1147     acpi_size               length)
1148 {
1149
1150     return AE_OK;
1151 }
1152
1153
1154 #endif