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/interrupt.h>
  34 #include <linux/kmod.h>
  35 #include <linux/delay.h>
  36 #include <linux/dmi.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 static struct workqueue_struct *kacpi_notify_wq;
  76
  77 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  78 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  79
  80 static int osi_linux;           /* disable _OSI(Linux) by default */
  81
  82 static void __init acpi_request_region (struct acpi_generic_address *addr,
  83         unsigned int length, char *desc)
  84 {
  85         struct resource *res;
  86
  87         if (!addr->address || !length)
  88                 return;
  89
  90         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  91                 res = request_region(addr->address, length, desc);
  92         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  93                 res = request_mem_region(addr->address, length, desc);
  94 }
  95
  96 static int __init acpi_reserve_resources(void)
  97 {
  98         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
  99                 "ACPI PM1a_EVT_BLK");
 100
 101         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 102                 "ACPI PM1b_EVT_BLK");
 103
 104         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 105                 "ACPI PM1a_CNT_BLK");
 106
 107         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 108                 "ACPI PM1b_CNT_BLK");
 109
 110         if (acpi_gbl_FADT.pm_timer_length == 4)
 111                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 112
 113         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 114                 "ACPI PM2_CNT_BLK");
 115
 116         /* Length of GPE blocks must be a non-negative multiple of 2 */
 117
 118         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 119                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 120                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 121
 122         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 123                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 124                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 125
 126         return 0;
 127 }
 128 device_initcall(acpi_reserve_resources);
 129
 130 acpi_status __init acpi_os_initialize(void)
 131 {
 132         return AE_OK;
 133 }
 134
 135 acpi_status acpi_os_initialize1(void)
 136 {
 137         /*
 138          * Initialize PCI configuration space access, as we'll need to access
 139          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 140          */
 141         if (!raw_pci_ops) {
 142                 printk(KERN_ERR PREFIX
 143                        "Access to PCI configuration space unavailable\n");
 144                 return AE_NULL_ENTRY;
 145         }
 146         kacpid_wq = create_singlethread_workqueue("kacpid");
 147         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 148         BUG_ON(!kacpid_wq);
 149         BUG_ON(!kacpi_notify_wq);
 150         return AE_OK;
 151 }
 152
 153 acpi_status acpi_os_terminate(void)
 154 {
 155         if (acpi_irq_handler) {
 156                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 157                                                  acpi_irq_handler);
 158         }
 159
 160         destroy_workqueue(kacpid_wq);
 161         destroy_workqueue(kacpi_notify_wq);
 162
 163         return AE_OK;
 164 }
 165
 166 void acpi_os_printf(const char *fmt, ...)
 167 {
 168         va_list args;
 169         va_start(args, fmt);
 170         acpi_os_vprintf(fmt, args);
 171         va_end(args);
 172 }
 173
 174 EXPORT_SYMBOL(acpi_os_printf);
 175
 176 void acpi_os_vprintf(const char *fmt, va_list args)
 177 {
 178         static char buffer[512];
 179
 180         vsprintf(buffer, fmt, args);
 181
 182 #ifdef ENABLE_DEBUGGER
 183         if (acpi_in_debugger) {
 184                 kdb_printf("%s", buffer);
 185         } else {
 186                 printk("%s", buffer);
 187         }
 188 #else
 189         printk("%s", buffer);
 190 #endif
 191 }
 192
 193 acpi_physical_address __init acpi_os_get_root_pointer(void)
 194 {
 195         if (efi_enabled) {
 196                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 197                         return efi.acpi20;
 198                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 199                         return efi.acpi;
 200                 else {
 201                         printk(KERN_ERR PREFIX
 202                                "System description tables not found\n");
 203                         return 0;
 204                 }
 205         } else
 206                 return acpi_find_rsdp();
 207 }
 208
 209 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 210 {
 211         if (phys > ULONG_MAX) {
 212                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 213                 return NULL;
 214         }
 215         if (acpi_gbl_permanent_mmap)
 216                 /*
 217                 * ioremap checks to ensure this is in reserved space
 218                 */
 219                 return ioremap((unsigned long)phys, size);
 220         else
 221                 return __acpi_map_table((unsigned long)phys, size);
 222 }
 223 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 224
 225 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 226 {
 227         if (acpi_gbl_permanent_mmap) {
 228                 iounmap(virt);
 229         }
 230 }
 231 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 232
 233 #ifdef ACPI_FUTURE_USAGE
 234 acpi_status
 235 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 236 {
 237         if (!phys || !virt)
 238                 return AE_BAD_PARAMETER;
 239
 240         *phys = virt_to_phys(virt);
 241
 242         return AE_OK;
 243 }
 244 #endif
 245
 246 #define ACPI_MAX_OVERRIDE_LEN 100
 247
 248 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 249
 250 acpi_status
 251 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 252                             acpi_string * new_val)
 253 {
 254         if (!init_val || !new_val)
 255                 return AE_BAD_PARAMETER;
 256
 257         *new_val = NULL;
 258         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 259                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 260                        acpi_os_name);
 261                 *new_val = acpi_os_name;
 262         }
 263
 264         return AE_OK;
 265 }
 266
 267 acpi_status
 268 acpi_os_table_override(struct acpi_table_header * existing_table,
 269                        struct acpi_table_header ** new_table)
 270 {
 271         if (!existing_table || !new_table)
 272                 return AE_BAD_PARAMETER;
 273
 274 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 275         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 276                 *new_table = (struct acpi_table_header *)AmlCode;
 277         else
 278                 *new_table = NULL;
 279 #else
 280         *new_table = NULL;
 281 #endif
 282         return AE_OK;
 283 }
 284
 285 static irqreturn_t acpi_irq(int irq, void *dev_id)
 286 {
 287         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 288 }
 289
 290 acpi_status
 291 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 292                                   void *context)
 293 {
 294         unsigned int irq;
 295
 296         /*
 297          * Ignore the GSI from the core, and use the value in our copy of the
 298          * FADT. It may not be the same if an interrupt source override exists
 299          * for the SCI.
 300          */
 301         gsi = acpi_gbl_FADT.sci_interrupt;
 302         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 303                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 304                        gsi);
 305                 return AE_OK;
 306         }
 307
 308         acpi_irq_handler = handler;
 309         acpi_irq_context = context;
 310         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 311                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 312                 return AE_NOT_ACQUIRED;
 313         }
 314         acpi_irq_irq = irq;
 315
 316         return AE_OK;
 317 }
 318
 319 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 320 {
 321         if (irq) {
 322                 free_irq(irq, acpi_irq);
 323                 acpi_irq_handler = NULL;
 324                 acpi_irq_irq = 0;
 325         }
 326
 327         return AE_OK;
 328 }
 329
 330 /*
 331  * Running in interpreter thread context, safe to sleep
 332  */
 333
 334 void acpi_os_sleep(acpi_integer ms)
 335 {
 336         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 337 }
 338
 339 EXPORT_SYMBOL(acpi_os_sleep);
 340
 341 void acpi_os_stall(u32 us)
 342 {
 343         while (us) {
 344                 u32 delay = 1000;
 345
 346                 if (delay > us)
 347                         delay = us;
 348                 udelay(delay);
 349                 touch_nmi_watchdog();
 350                 us -= delay;
 351         }
 352 }
 353
 354 EXPORT_SYMBOL(acpi_os_stall);
 355
 356 /*
 357  * Support ACPI 3.0 AML Timer operand
 358  * Returns 64-bit free-running, monotonically increasing timer
 359  * with 100ns granularity
 360  */
 361 u64 acpi_os_get_timer(void)
 362 {
 363         static u64 t;
 364
 365 #ifdef  CONFIG_HPET
 366         /* TBD: use HPET if available */
 367 #endif
 368
 369 #ifdef  CONFIG_X86_PM_TIMER
 370         /* TBD: default to PM timer if HPET was not available */
 371 #endif
 372         if (!t)
 373                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 374
 375         return ++t;
 376 }
 377
 378 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 379 {
 380         u32 dummy;
 381
 382         if (!value)
 383                 value = &dummy;
 384
 385         *value = 0;
 386         if (width <= 8) {
 387                 *(u8 *) value = inb(port);
 388         } else if (width <= 16) {
 389                 *(u16 *) value = inw(port);
 390         } else if (width <= 32) {
 391                 *(u32 *) value = inl(port);
 392         } else {
 393                 BUG();
 394         }
 395
 396         return AE_OK;
 397 }
 398
 399 EXPORT_SYMBOL(acpi_os_read_port);
 400
 401 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 402 {
 403         if (width <= 8) {
 404                 outb(value, port);
 405         } else if (width <= 16) {
 406                 outw(value, port);
 407         } else if (width <= 32) {
 408                 outl(value, port);
 409         } else {
 410                 BUG();
 411         }
 412
 413         return AE_OK;
 414 }
 415
 416 EXPORT_SYMBOL(acpi_os_write_port);
 417
 418 acpi_status
 419 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 420 {
 421         u32 dummy;
 422         void __iomem *virt_addr;
 423
 424         virt_addr = ioremap(phys_addr, width);
 425         if (!value)
 426                 value = &dummy;
 427
 428         switch (width) {
 429         case 8:
 430                 *(u8 *) value = readb(virt_addr);
 431                 break;
 432         case 16:
 433                 *(u16 *) value = readw(virt_addr);
 434                 break;
 435         case 32:
 436                 *(u32 *) value = readl(virt_addr);
 437                 break;
 438         default:
 439                 BUG();
 440         }
 441
 442         iounmap(virt_addr);
 443
 444         return AE_OK;
 445 }
 446
 447 acpi_status
 448 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 449 {
 450         void __iomem *virt_addr;
 451
 452         virt_addr = ioremap(phys_addr, width);
 453
 454         switch (width) {
 455         case 8:
 456                 writeb(value, virt_addr);
 457                 break;
 458         case 16:
 459                 writew(value, virt_addr);
 460                 break;
 461         case 32:
 462                 writel(value, virt_addr);
 463                 break;
 464         default:
 465                 BUG();
 466         }
 467
 468         iounmap(virt_addr);
 469
 470         return AE_OK;
 471 }
 472
 473 acpi_status
 474 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 475                                void *value, u32 width)
 476 {
 477         int result, size;
 478
 479         if (!value)
 480                 return AE_BAD_PARAMETER;
 481
 482         switch (width) {
 483         case 8:
 484                 size = 1;
 485                 break;
 486         case 16:
 487                 size = 2;
 488                 break;
 489         case 32:
 490                 size = 4;
 491                 break;
 492         default:
 493                 return AE_ERROR;
 494         }
 495
 496         BUG_ON(!raw_pci_ops);
 497
 498         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 499                                    PCI_DEVFN(pci_id->device, pci_id->function),
 500                                    reg, size, value);
 501
 502         return (result ? AE_ERROR : AE_OK);
 503 }
 504
 505 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 506
 507 acpi_status
 508 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 509                                 acpi_integer value, u32 width)
 510 {
 511         int result, size;
 512
 513         switch (width) {
 514         case 8:
 515                 size = 1;
 516                 break;
 517         case 16:
 518                 size = 2;
 519                 break;
 520         case 32:
 521                 size = 4;
 522                 break;
 523         default:
 524                 return AE_ERROR;
 525         }
 526
 527         BUG_ON(!raw_pci_ops);
 528
 529         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 530                                     PCI_DEVFN(pci_id->device, pci_id->function),
 531                                     reg, size, value);
 532
 533         return (result ? AE_ERROR : AE_OK);
 534 }
 535
 536 /* TODO: Change code to take advantage of driver model more */
 537 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 538                                     acpi_handle chandle,        /* current node */
 539                                     struct acpi_pci_id **id,
 540                                     int *is_bridge, u8 * bus_number)
 541 {
 542         acpi_handle handle;
 543         struct acpi_pci_id *pci_id = *id;
 544         acpi_status status;
 545         unsigned long temp;
 546         acpi_object_type type;
 547         u8 tu8;
 548
 549         acpi_get_parent(chandle, &handle);
 550         if (handle != rhandle) {
 551                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 552                                         bus_number);
 553
 554                 status = acpi_get_type(handle, &type);
 555                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 556                         return;
 557
 558                 status =
 559                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 560                                           &temp);
 561                 if (ACPI_SUCCESS(status)) {
 562                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 563                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 564
 565                         if (*is_bridge)
 566                                 pci_id->bus = *bus_number;
 567
 568                         /* any nicer way to get bus number of bridge ? */
 569                         status =
 570                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 571                                                            8);
 572                         if (ACPI_SUCCESS(status)
 573                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 574                                 status =
 575                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 576                                                                    &tu8, 8);
 577                                 if (!ACPI_SUCCESS(status)) {
 578                                         /* Certainly broken...  FIX ME */
 579                                         return;
 580                                 }
 581                                 *is_bridge = 1;
 582                                 pci_id->bus = tu8;
 583                                 status =
 584                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 585                                                                    &tu8, 8);
 586                                 if (ACPI_SUCCESS(status)) {
 587                                         *bus_number = tu8;
 588                                 }
 589                         } else
 590                                 *is_bridge = 0;
 591                 }
 592         }
 593 }
 594
 595 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 596                            acpi_handle chandle, /* current node */
 597                            struct acpi_pci_id **id)
 598 {
 599         int is_bridge = 1;
 600         u8 bus_number = (*id)->bus;
 601
 602         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 603 }
 604
 605 static void acpi_os_execute_deferred(struct work_struct *work)
 606 {
 607         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 608         if (!dpc) {
 609                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 610                 return;
 611         }
 612
 613         dpc->function(dpc->context);
 614         kfree(dpc);
 615
 616         /* Yield cpu to notify thread */
 617         cond_resched();
 618
 619         return;
 620 }
 621
 622 static void acpi_os_execute_notify(struct work_struct *work)
 623 {
 624         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 625
 626         if (!dpc) {
 627                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 628                 return;
 629         }
 630
 631         dpc->function(dpc->context);
 632
 633         kfree(dpc);
 634
 635         return;
 636 }
 637
 638 /*******************************************************************************
 639  *
 640  * FUNCTION:    acpi_os_execute
 641  *
 642  * PARAMETERS:  Type               - Type of the callback
 643  *              Function           - Function to be executed
 644  *              Context            - Function parameters
 645  *
 646  * RETURN:      Status
 647  *
 648  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 649  *              immediately executes function on a separate thread.
 650  *
 651  ******************************************************************************/
 652
 653 acpi_status acpi_os_execute(acpi_execute_type type,
 654                             acpi_osd_exec_callback function, void *context)
 655 {
 656         acpi_status status = AE_OK;
 657         struct acpi_os_dpc *dpc;
 658
 659         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 660                           "Scheduling function [%p(%p)] for deferred execution.\n",
 661                           function, context));
 662
 663         if (!function)
 664                 return AE_BAD_PARAMETER;
 665
 666         /*
 667          * Allocate/initialize DPC structure.  Note that this memory will be
 668          * freed by the callee.  The kernel handles the work_struct list  in a
 669          * way that allows us to also free its memory inside the callee.
 670          * Because we may want to schedule several tasks with different
 671          * parameters we can't use the approach some kernel code uses of
 672          * having a static work_struct.
 673          */
 674
 675         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 676         if (!dpc)
 677                 return_ACPI_STATUS(AE_NO_MEMORY);
 678
 679         dpc->function = function;
 680         dpc->context = context;
 681
 682         if (type == OSL_NOTIFY_HANDLER) {
 683                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 684                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 685                         status = AE_ERROR;
 686                         kfree(dpc);
 687                 }
 688         } else {
 689                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 690                 if (!queue_work(kacpid_wq, &dpc->work)) {
 691                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 692                                   "Call to queue_work() failed.\n"));
 693                         status = AE_ERROR;
 694                         kfree(dpc);
 695                 }
 696         }
 697         return_ACPI_STATUS(status);
 698 }
 699
 700 EXPORT_SYMBOL(acpi_os_execute);
 701
 702 void acpi_os_wait_events_complete(void *context)
 703 {
 704         flush_workqueue(kacpid_wq);
 705 }
 706
 707 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 708
 709 /*
 710  * Allocate the memory for a spinlock and initialize it.
 711  */
 712 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 713 {
 714         spin_lock_init(*handle);
 715
 716         return AE_OK;
 717 }
 718
 719 /*
 720  * Deallocate the memory for a spinlock.
 721  */
 722 void acpi_os_delete_lock(acpi_spinlock handle)
 723 {
 724         return;
 725 }
 726
 727 acpi_status
 728 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 729 {
 730         struct semaphore *sem = NULL;
 731
 732
 733         sem = acpi_os_allocate(sizeof(struct semaphore));
 734         if (!sem)
 735                 return AE_NO_MEMORY;
 736         memset(sem, 0, sizeof(struct semaphore));
 737
 738         sema_init(sem, initial_units);
 739
 740         *handle = (acpi_handle *) sem;
 741
 742         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 743                           *handle, initial_units));
 744
 745         return AE_OK;
 746 }
 747
 748 EXPORT_SYMBOL(acpi_os_create_semaphore);
 749
 750 /*
 751  * TODO: A better way to delete semaphores?  Linux doesn't have a
 752  * 'delete_semaphore()' function -- may result in an invalid
 753  * pointer dereference for non-synchronized consumers.  Should
 754  * we at least check for blocked threads and signal/cancel them?
 755  */
 756
 757 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 758 {
 759         struct semaphore *sem = (struct semaphore *)handle;
 760
 761
 762         if (!sem)
 763                 return AE_BAD_PARAMETER;
 764
 765         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 766
 767         kfree(sem);
 768         sem = NULL;
 769
 770         return AE_OK;
 771 }
 772
 773 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 774
 775 /*
 776  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 777  * improvise.  The process is to sleep for one scheduler quantum
 778  * until the semaphore becomes available.  Downside is that this
 779  * may result in starvation for timeout-based waits when there's
 780  * lots of semaphore activity.
 781  *
 782  * TODO: Support for units > 1?
 783  */
 784 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 785 {
 786         acpi_status status = AE_OK;
 787         struct semaphore *sem = (struct semaphore *)handle;
 788         int ret = 0;
 789
 790
 791         if (!sem || (units < 1))
 792                 return AE_BAD_PARAMETER;
 793
 794         if (units > 1)
 795                 return AE_SUPPORT;
 796
 797         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 798                           handle, units, timeout));
 799
 800         /*
 801          * This can be called during resume with interrupts off.
 802          * Like boot-time, we should be single threaded and will
 803          * always get the lock if we try -- timeout or not.
 804          * If this doesn't succeed, then we will oops courtesy of
 805          * might_sleep() in down().
 806          */
 807         if (!down_trylock(sem))
 808                 return AE_OK;
 809
 810         switch (timeout) {
 811                 /*
 812                  * No Wait:
 813                  * --------
 814                  * A zero timeout value indicates that we shouldn't wait - just
 815                  * acquire the semaphore if available otherwise return AE_TIME
 816                  * (a.k.a. 'would block').
 817                  */
 818         case 0:
 819                 if (down_trylock(sem))
 820                         status = AE_TIME;
 821                 break;
 822
 823                 /*
 824                  * Wait Indefinitely:
 825                  * ------------------
 826                  */
 827         case ACPI_WAIT_FOREVER:
 828                 down(sem);
 829                 break;
 830
 831                 /*
 832                  * Wait w/ Timeout:
 833                  * ----------------
 834                  */
 835         default:
 836                 // TODO: A better timeout algorithm?
 837                 {
 838                         int i = 0;
 839                         static const int quantum_ms = 1000 / HZ;
 840
 841                         ret = down_trylock(sem);
 842                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 843                                 schedule_timeout_interruptible(1);
 844                                 ret = down_trylock(sem);
 845                         }
 846
 847                         if (ret != 0)
 848                                 status = AE_TIME;
 849                 }
 850                 break;
 851         }
 852
 853         if (ACPI_FAILURE(status)) {
 854                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 855                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 856                                   handle, units, timeout,
 857                                   acpi_format_exception(status)));
 858         } else {
 859                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 860                                   "Acquired semaphore[%p|%d|%d]", handle,
 861                                   units, timeout));
 862         }
 863
 864         return status;
 865 }
 866
 867 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 868
 869 /*
 870  * TODO: Support for units > 1?
 871  */
 872 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 873 {
 874         struct semaphore *sem = (struct semaphore *)handle;
 875
 876
 877         if (!sem || (units < 1))
 878                 return AE_BAD_PARAMETER;
 879
 880         if (units > 1)
 881                 return AE_SUPPORT;
 882
 883         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 884                           units));
 885
 886         up(sem);
 887
 888         return AE_OK;
 889 }
 890
 891 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 892
 893 #ifdef ACPI_FUTURE_USAGE
 894 u32 acpi_os_get_line(char *buffer)
 895 {
 896
 897 #ifdef ENABLE_DEBUGGER
 898         if (acpi_in_debugger) {
 899                 u32 chars;
 900
 901                 kdb_read(buffer, sizeof(line_buf));
 902
 903                 /* remove the CR kdb includes */
 904                 chars = strlen(buffer) - 1;
 905                 buffer[chars] = '\0';
 906         }
 907 #endif
 908
 909         return 0;
 910 }
 911 #endif                          /*  ACPI_FUTURE_USAGE  */
 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 static void enable_osi_linux(int enable) {
 963
 964         if (osi_linux != enable)
 965                 printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",
 966                         enable ? "En": "Dis");
 967
 968         osi_linux = enable;
 969         return;
 970 }
 971
 972 /*
 973  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 974  *
 975  * empty string disables _OSI
 976  * string starting with '!' disables that string
 977  * otherwise string is added to list, augmenting built-in strings
 978  */
 979 static int __init acpi_osi_setup(char *str)
 980 {
 981         if (str == NULL || *str == '\0') {
 982                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 983                 acpi_gbl_create_osi_method = FALSE;
 984         } else if (!strcmp("!Linux", str)) {
 985                 enable_osi_linux(0);
 986         } else if (*str == '!') {
 987                 if (acpi_osi_invalidate(++str) == AE_OK)
 988                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
 989         } else if (!strcmp("Linux", str)) {
 990                 enable_osi_linux(1);
 991         } else if (*osi_additional_string == '\0') {
 992                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
 993                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
 994         }
 995
 996         return 1;
 997 }
 998
 999 __setup("acpi_osi=", acpi_osi_setup);
1000
1001 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1002 static int __init acpi_serialize_setup(char *str)
1003 {
1004         printk(KERN_INFO PREFIX "serialize enabled\n");
1005
1006         acpi_gbl_all_methods_serialized = TRUE;
1007
1008         return 1;
1009 }
1010
1011 __setup("acpi_serialize", acpi_serialize_setup);
1012
1013 /*
1014  * Wake and Run-Time GPES are expected to be separate.
1015  * We disable wake-GPEs at run-time to prevent spurious
1016  * interrupts.
1017  *
1018  * However, if a system exists that shares Wake and
1019  * Run-time events on the same GPE this flag is available
1020  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1021  */
1022 static int __init acpi_wake_gpes_always_on_setup(char *str)
1023 {
1024         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1025
1026         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1027
1028         return 1;
1029 }
1030
1031 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1032
1033 /*
1034  * Acquire a spinlock.
1035  *
1036  * handle is a pointer to the spinlock_t.
1037  */
1038
1039 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1040 {
1041         acpi_cpu_flags flags;
1042         spin_lock_irqsave(lockp, flags);
1043         return flags;
1044 }
1045
1046 /*
1047  * Release a spinlock. See above.
1048  */
1049
1050 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1051 {
1052         spin_unlock_irqrestore(lockp, flags);
1053 }
1054
1055 #ifndef ACPI_USE_LOCAL_CACHE
1056
1057 /*******************************************************************************
1058  *
1059  * FUNCTION:    acpi_os_create_cache
1060  *
1061  * PARAMETERS:  name      - Ascii name for the cache
1062  *              size      - Size of each cached object
1063  *              depth     - Maximum depth of the cache (in objects) <ignored>
1064  *              cache     - Where the new cache object is returned
1065  *
1066  * RETURN:      status
1067  *
1068  * DESCRIPTION: Create a cache object
1069  *
1070  ******************************************************************************/
1071
1072 acpi_status
1073 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1074 {
1075         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1076         if (*cache == NULL)
1077                 return AE_ERROR;
1078         else
1079                 return AE_OK;
1080 }
1081
1082 /*******************************************************************************
1083  *
1084  * FUNCTION:    acpi_os_purge_cache
1085  *
1086  * PARAMETERS:  Cache           - Handle to cache object
1087  *
1088  * RETURN:      Status
1089  *
1090  * DESCRIPTION: Free all objects within the requested cache.
1091  *
1092  ******************************************************************************/
1093
1094 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1095 {
1096         kmem_cache_shrink(cache);
1097         return (AE_OK);
1098 }
1099
1100 /*******************************************************************************
1101  *
1102  * FUNCTION:    acpi_os_delete_cache
1103  *
1104  * PARAMETERS:  Cache           - Handle to cache object
1105  *
1106  * RETURN:      Status
1107  *
1108  * DESCRIPTION: Free all objects within the requested cache and delete the
1109  *              cache object.
1110  *
1111  ******************************************************************************/
1112
1113 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1114 {
1115         kmem_cache_destroy(cache);
1116         return (AE_OK);
1117 }
1118
1119 /*******************************************************************************
1120  *
1121  * FUNCTION:    acpi_os_release_object
1122  *
1123  * PARAMETERS:  Cache       - Handle to cache object
1124  *              Object      - The object to be released
1125  *
1126  * RETURN:      None
1127  *
1128  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1129  *              the object is deleted.
1130  *
1131  ******************************************************************************/
1132
1133 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1134 {
1135         kmem_cache_free(cache, object);
1136         return (AE_OK);
1137 }
1138
1139 /**
1140  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1141  *
1142  *      Returns 0 on success
1143  */
1144 int acpi_dmi_dump(void)
1145 {
1146
1147         if (!dmi_available)
1148                 return -1;
1149
1150         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1151                 dmi_get_slot(DMI_SYS_VENDOR));
1152         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1153                 dmi_get_slot(DMI_PRODUCT_NAME));
1154         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1155                 dmi_get_slot(DMI_PRODUCT_VERSION));
1156         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1157                 dmi_get_slot(DMI_BOARD_NAME));
1158         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1159                 dmi_get_slot(DMI_BIOS_VENDOR));
1160         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1161                 dmi_get_slot(DMI_BIOS_DATE));
1162
1163         return 0;
1164 }
1165
1166
1167 /******************************************************************************
1168  *
1169  * FUNCTION:    acpi_os_validate_interface
1170  *
1171  * PARAMETERS:  interface           - Requested interface to be validated
1172  *
1173  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1174  *
1175  * DESCRIPTION: Match an interface string to the interfaces supported by the
1176  *              host. Strings originate from an AML call to the _OSI method.
1177  *
1178  *****************************************************************************/
1179
1180 acpi_status
1181 acpi_os_validate_interface (char *interface)
1182 {
1183         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1184                 return AE_OK;
1185         if (!strcmp("Linux", interface)) {
1186                 printk(KERN_WARNING PREFIX
1187                         "System BIOS is requesting _OSI(Linux)\n");
1188                 if (acpi_dmi_dump())
1189                         printk(KERN_NOTICE PREFIX
1190                                 "[please extract dmidecode output]\n");
1191                 printk(KERN_NOTICE PREFIX
1192                         "Please send DMI info above to "
1193                         "linux-acpi@vger.kernel.org\n");
1194                 printk(KERN_NOTICE PREFIX
1195                         "If \"acpi_osi=%sLinux\" works better, "
1196                         "please notify linux-acpi@vger.kernel.org\n",
1197                         osi_linux ? "!" : "");
1198                 if(osi_linux)
1199                         return AE_OK;
1200         }
1201         return AE_SUPPORT;
1202 }
1203
1204 /******************************************************************************
1205  *
1206  * FUNCTION:    acpi_os_validate_address
1207  *
1208  * PARAMETERS:  space_id             - ACPI space ID
1209  *              address             - Physical address
1210  *              length              - Address length
1211  *
1212  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1213  *              should return AE_AML_ILLEGAL_ADDRESS.
1214  *
1215  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1216  *              the addresses accessed by AML operation regions.
1217  *
1218  *****************************************************************************/
1219
1220 acpi_status
1221 acpi_os_validate_address (
1222     u8                   space_id,
1223     acpi_physical_address   address,
1224     acpi_size               length)
1225 {
1226
1227     return AE_OK;
1228 }
1229
1230 #endif