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 #ifdef CONFIG_DMI
  83 static struct __initdata dmi_system_id acpi_osl_dmi_table[];
  84 #endif
  85
  86 static void __init acpi_request_region (struct acpi_generic_address *addr,
  87         unsigned int length, char *desc)
  88 {
  89         struct resource *res;
  90
  91         if (!addr->address || !length)
  92                 return;
  93
  94         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  95                 res = request_region(addr->address, length, desc);
  96         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  97                 res = request_mem_region(addr->address, length, desc);
  98 }
  99
 100 static int __init acpi_reserve_resources(void)
 101 {
 102         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 103                 "ACPI PM1a_EVT_BLK");
 104
 105         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 106                 "ACPI PM1b_EVT_BLK");
 107
 108         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 109                 "ACPI PM1a_CNT_BLK");
 110
 111         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 112                 "ACPI PM1b_CNT_BLK");
 113
 114         if (acpi_gbl_FADT.pm_timer_length == 4)
 115                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 116
 117         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 118                 "ACPI PM2_CNT_BLK");
 119
 120         /* Length of GPE blocks must be a non-negative multiple of 2 */
 121
 122         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 123                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 124                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 125
 126         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 127                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 128                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 129
 130         return 0;
 131 }
 132 device_initcall(acpi_reserve_resources);
 133
 134 acpi_status __init acpi_os_initialize(void)
 135 {
 136         dmi_check_system(acpi_osl_dmi_table);
 137         return AE_OK;
 138 }
 139
 140 acpi_status acpi_os_initialize1(void)
 141 {
 142         /*
 143          * Initialize PCI configuration space access, as we'll need to access
 144          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 145          */
 146         if (!raw_pci_ops) {
 147                 printk(KERN_ERR PREFIX
 148                        "Access to PCI configuration space unavailable\n");
 149                 return AE_NULL_ENTRY;
 150         }
 151         kacpid_wq = create_singlethread_workqueue("kacpid");
 152         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 153         BUG_ON(!kacpid_wq);
 154         BUG_ON(!kacpi_notify_wq);
 155         return AE_OK;
 156 }
 157
 158 acpi_status acpi_os_terminate(void)
 159 {
 160         if (acpi_irq_handler) {
 161                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 162                                                  acpi_irq_handler);
 163         }
 164
 165         destroy_workqueue(kacpid_wq);
 166         destroy_workqueue(kacpi_notify_wq);
 167
 168         return AE_OK;
 169 }
 170
 171 void acpi_os_printf(const char *fmt, ...)
 172 {
 173         va_list args;
 174         va_start(args, fmt);
 175         acpi_os_vprintf(fmt, args);
 176         va_end(args);
 177 }
 178
 179 EXPORT_SYMBOL(acpi_os_printf);
 180
 181 void acpi_os_vprintf(const char *fmt, va_list args)
 182 {
 183         static char buffer[512];
 184
 185         vsprintf(buffer, fmt, args);
 186
 187 #ifdef ENABLE_DEBUGGER
 188         if (acpi_in_debugger) {
 189                 kdb_printf("%s", buffer);
 190         } else {
 191                 printk("%s", buffer);
 192         }
 193 #else
 194         printk("%s", buffer);
 195 #endif
 196 }
 197
 198 acpi_physical_address __init acpi_os_get_root_pointer(void)
 199 {
 200         if (efi_enabled) {
 201                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 202                         return efi.acpi20;
 203                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 204                         return efi.acpi;
 205                 else {
 206                         printk(KERN_ERR PREFIX
 207                                "System description tables not found\n");
 208                         return 0;
 209                 }
 210         } else
 211                 return acpi_find_rsdp();
 212 }
 213
 214 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 215 {
 216         if (phys > ULONG_MAX) {
 217                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 218                 return NULL;
 219         }
 220         if (acpi_gbl_permanent_mmap)
 221                 /*
 222                 * ioremap checks to ensure this is in reserved space
 223                 */
 224                 return ioremap((unsigned long)phys, size);
 225         else
 226                 return __acpi_map_table((unsigned long)phys, size);
 227 }
 228 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 229
 230 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 231 {
 232         if (acpi_gbl_permanent_mmap) {
 233                 iounmap(virt);
 234         }
 235 }
 236 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 237
 238 #ifdef ACPI_FUTURE_USAGE
 239 acpi_status
 240 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 241 {
 242         if (!phys || !virt)
 243                 return AE_BAD_PARAMETER;
 244
 245         *phys = virt_to_phys(virt);
 246
 247         return AE_OK;
 248 }
 249 #endif
 250
 251 #define ACPI_MAX_OVERRIDE_LEN 100
 252
 253 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 254
 255 acpi_status
 256 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 257                             acpi_string * new_val)
 258 {
 259         if (!init_val || !new_val)
 260                 return AE_BAD_PARAMETER;
 261
 262         *new_val = NULL;
 263         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 264                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 265                        acpi_os_name);
 266                 *new_val = acpi_os_name;
 267         }
 268
 269         return AE_OK;
 270 }
 271
 272 acpi_status
 273 acpi_os_table_override(struct acpi_table_header * existing_table,
 274                        struct acpi_table_header ** new_table)
 275 {
 276         if (!existing_table || !new_table)
 277                 return AE_BAD_PARAMETER;
 278
 279 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 280         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 281                 *new_table = (struct acpi_table_header *)AmlCode;
 282         else
 283                 *new_table = NULL;
 284 #else
 285         *new_table = NULL;
 286 #endif
 287         return AE_OK;
 288 }
 289
 290 static irqreturn_t acpi_irq(int irq, void *dev_id)
 291 {
 292         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 293 }
 294
 295 acpi_status
 296 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 297                                   void *context)
 298 {
 299         unsigned int irq;
 300
 301         /*
 302          * Ignore the GSI from the core, and use the value in our copy of the
 303          * FADT. It may not be the same if an interrupt source override exists
 304          * for the SCI.
 305          */
 306         gsi = acpi_gbl_FADT.sci_interrupt;
 307         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 308                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 309                        gsi);
 310                 return AE_OK;
 311         }
 312
 313         acpi_irq_handler = handler;
 314         acpi_irq_context = context;
 315         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 316                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 317                 return AE_NOT_ACQUIRED;
 318         }
 319         acpi_irq_irq = irq;
 320
 321         return AE_OK;
 322 }
 323
 324 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 325 {
 326         if (irq) {
 327                 free_irq(irq, acpi_irq);
 328                 acpi_irq_handler = NULL;
 329                 acpi_irq_irq = 0;
 330         }
 331
 332         return AE_OK;
 333 }
 334
 335 /*
 336  * Running in interpreter thread context, safe to sleep
 337  */
 338
 339 void acpi_os_sleep(acpi_integer ms)
 340 {
 341         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 342 }
 343
 344 EXPORT_SYMBOL(acpi_os_sleep);
 345
 346 void acpi_os_stall(u32 us)
 347 {
 348         while (us) {
 349                 u32 delay = 1000;
 350
 351                 if (delay > us)
 352                         delay = us;
 353                 udelay(delay);
 354                 touch_nmi_watchdog();
 355                 us -= delay;
 356         }
 357 }
 358
 359 EXPORT_SYMBOL(acpi_os_stall);
 360
 361 /*
 362  * Support ACPI 3.0 AML Timer operand
 363  * Returns 64-bit free-running, monotonically increasing timer
 364  * with 100ns granularity
 365  */
 366 u64 acpi_os_get_timer(void)
 367 {
 368         static u64 t;
 369
 370 #ifdef  CONFIG_HPET
 371         /* TBD: use HPET if available */
 372 #endif
 373
 374 #ifdef  CONFIG_X86_PM_TIMER
 375         /* TBD: default to PM timer if HPET was not available */
 376 #endif
 377         if (!t)
 378                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 379
 380         return ++t;
 381 }
 382
 383 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 384 {
 385         u32 dummy;
 386
 387         if (!value)
 388                 value = &dummy;
 389
 390         *value = 0;
 391         if (width <= 8) {
 392                 *(u8 *) value = inb(port);
 393         } else if (width <= 16) {
 394                 *(u16 *) value = inw(port);
 395         } else if (width <= 32) {
 396                 *(u32 *) value = inl(port);
 397         } else {
 398                 BUG();
 399         }
 400
 401         return AE_OK;
 402 }
 403
 404 EXPORT_SYMBOL(acpi_os_read_port);
 405
 406 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 407 {
 408         if (width <= 8) {
 409                 outb(value, port);
 410         } else if (width <= 16) {
 411                 outw(value, port);
 412         } else if (width <= 32) {
 413                 outl(value, port);
 414         } else {
 415                 BUG();
 416         }
 417
 418         return AE_OK;
 419 }
 420
 421 EXPORT_SYMBOL(acpi_os_write_port);
 422
 423 acpi_status
 424 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 425 {
 426         u32 dummy;
 427         void __iomem *virt_addr;
 428
 429         virt_addr = ioremap(phys_addr, width);
 430         if (!value)
 431                 value = &dummy;
 432
 433         switch (width) {
 434         case 8:
 435                 *(u8 *) value = readb(virt_addr);
 436                 break;
 437         case 16:
 438                 *(u16 *) value = readw(virt_addr);
 439                 break;
 440         case 32:
 441                 *(u32 *) value = readl(virt_addr);
 442                 break;
 443         default:
 444                 BUG();
 445         }
 446
 447         iounmap(virt_addr);
 448
 449         return AE_OK;
 450 }
 451
 452 acpi_status
 453 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 454 {
 455         void __iomem *virt_addr;
 456
 457         virt_addr = ioremap(phys_addr, width);
 458
 459         switch (width) {
 460         case 8:
 461                 writeb(value, virt_addr);
 462                 break;
 463         case 16:
 464                 writew(value, virt_addr);
 465                 break;
 466         case 32:
 467                 writel(value, virt_addr);
 468                 break;
 469         default:
 470                 BUG();
 471         }
 472
 473         iounmap(virt_addr);
 474
 475         return AE_OK;
 476 }
 477
 478 acpi_status
 479 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 480                                void *value, u32 width)
 481 {
 482         int result, size;
 483
 484         if (!value)
 485                 return AE_BAD_PARAMETER;
 486
 487         switch (width) {
 488         case 8:
 489                 size = 1;
 490                 break;
 491         case 16:
 492                 size = 2;
 493                 break;
 494         case 32:
 495                 size = 4;
 496                 break;
 497         default:
 498                 return AE_ERROR;
 499         }
 500
 501         BUG_ON(!raw_pci_ops);
 502
 503         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 504                                    PCI_DEVFN(pci_id->device, pci_id->function),
 505                                    reg, size, value);
 506
 507         return (result ? AE_ERROR : AE_OK);
 508 }
 509
 510 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 511
 512 acpi_status
 513 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 514                                 acpi_integer value, u32 width)
 515 {
 516         int result, size;
 517
 518         switch (width) {
 519         case 8:
 520                 size = 1;
 521                 break;
 522         case 16:
 523                 size = 2;
 524                 break;
 525         case 32:
 526                 size = 4;
 527                 break;
 528         default:
 529                 return AE_ERROR;
 530         }
 531
 532         BUG_ON(!raw_pci_ops);
 533
 534         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 535                                     PCI_DEVFN(pci_id->device, pci_id->function),
 536                                     reg, size, value);
 537
 538         return (result ? AE_ERROR : AE_OK);
 539 }
 540
 541 /* TODO: Change code to take advantage of driver model more */
 542 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 543                                     acpi_handle chandle,        /* current node */
 544                                     struct acpi_pci_id **id,
 545                                     int *is_bridge, u8 * bus_number)
 546 {
 547         acpi_handle handle;
 548         struct acpi_pci_id *pci_id = *id;
 549         acpi_status status;
 550         unsigned long temp;
 551         acpi_object_type type;
 552         u8 tu8;
 553
 554         acpi_get_parent(chandle, &handle);
 555         if (handle != rhandle) {
 556                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 557                                         bus_number);
 558
 559                 status = acpi_get_type(handle, &type);
 560                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 561                         return;
 562
 563                 status =
 564                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 565                                           &temp);
 566                 if (ACPI_SUCCESS(status)) {
 567                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 568                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 569
 570                         if (*is_bridge)
 571                                 pci_id->bus = *bus_number;
 572
 573                         /* any nicer way to get bus number of bridge ? */
 574                         status =
 575                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 576                                                            8);
 577                         if (ACPI_SUCCESS(status)
 578                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 579                                 status =
 580                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 581                                                                    &tu8, 8);
 582                                 if (!ACPI_SUCCESS(status)) {
 583                                         /* Certainly broken...  FIX ME */
 584                                         return;
 585                                 }
 586                                 *is_bridge = 1;
 587                                 pci_id->bus = tu8;
 588                                 status =
 589                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 590                                                                    &tu8, 8);
 591                                 if (ACPI_SUCCESS(status)) {
 592                                         *bus_number = tu8;
 593                                 }
 594                         } else
 595                                 *is_bridge = 0;
 596                 }
 597         }
 598 }
 599
 600 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 601                            acpi_handle chandle, /* current node */
 602                            struct acpi_pci_id **id)
 603 {
 604         int is_bridge = 1;
 605         u8 bus_number = (*id)->bus;
 606
 607         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 608 }
 609
 610 static void acpi_os_execute_deferred(struct work_struct *work)
 611 {
 612         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 613         if (!dpc) {
 614                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 615                 return;
 616         }
 617
 618         dpc->function(dpc->context);
 619         kfree(dpc);
 620
 621         return;
 622 }
 623
 624 /*******************************************************************************
 625  *
 626  * FUNCTION:    acpi_os_execute
 627  *
 628  * PARAMETERS:  Type               - Type of the callback
 629  *              Function           - Function to be executed
 630  *              Context            - Function parameters
 631  *
 632  * RETURN:      Status
 633  *
 634  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 635  *              immediately executes function on a separate thread.
 636  *
 637  ******************************************************************************/
 638
 639 acpi_status acpi_os_execute(acpi_execute_type type,
 640                             acpi_osd_exec_callback function, void *context)
 641 {
 642         acpi_status status = AE_OK;
 643         struct acpi_os_dpc *dpc;
 644         struct workqueue_struct *queue;
 645         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 646                           "Scheduling function [%p(%p)] for deferred execution.\n",
 647                           function, context));
 648
 649         if (!function)
 650                 return AE_BAD_PARAMETER;
 651
 652         /*
 653          * Allocate/initialize DPC structure.  Note that this memory will be
 654          * freed by the callee.  The kernel handles the work_struct list  in a
 655          * way that allows us to also free its memory inside the callee.
 656          * Because we may want to schedule several tasks with different
 657          * parameters we can't use the approach some kernel code uses of
 658          * having a static work_struct.
 659          */
 660
 661         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 662         if (!dpc)
 663                 return_ACPI_STATUS(AE_NO_MEMORY);
 664
 665         dpc->function = function;
 666         dpc->context = context;
 667
 668         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 669         queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
 670         if (!queue_work(queue, &dpc->work)) {
 671                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 672                           "Call to queue_work() failed.\n"));
 673                 status = AE_ERROR;
 674                 kfree(dpc);
 675         }
 676         return_ACPI_STATUS(status);
 677 }
 678
 679 EXPORT_SYMBOL(acpi_os_execute);
 680
 681 void acpi_os_wait_events_complete(void *context)
 682 {
 683         flush_workqueue(kacpid_wq);
 684 }
 685
 686 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 687
 688 /*
 689  * Allocate the memory for a spinlock and initialize it.
 690  */
 691 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 692 {
 693         spin_lock_init(*handle);
 694
 695         return AE_OK;
 696 }
 697
 698 /*
 699  * Deallocate the memory for a spinlock.
 700  */
 701 void acpi_os_delete_lock(acpi_spinlock handle)
 702 {
 703         return;
 704 }
 705
 706 acpi_status
 707 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 708 {
 709         struct semaphore *sem = NULL;
 710
 711
 712         sem = acpi_os_allocate(sizeof(struct semaphore));
 713         if (!sem)
 714                 return AE_NO_MEMORY;
 715         memset(sem, 0, sizeof(struct semaphore));
 716
 717         sema_init(sem, initial_units);
 718
 719         *handle = (acpi_handle *) sem;
 720
 721         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 722                           *handle, initial_units));
 723
 724         return AE_OK;
 725 }
 726
 727 EXPORT_SYMBOL(acpi_os_create_semaphore);
 728
 729 /*
 730  * TODO: A better way to delete semaphores?  Linux doesn't have a
 731  * 'delete_semaphore()' function -- may result in an invalid
 732  * pointer dereference for non-synchronized consumers.  Should
 733  * we at least check for blocked threads and signal/cancel them?
 734  */
 735
 736 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 737 {
 738         struct semaphore *sem = (struct semaphore *)handle;
 739
 740
 741         if (!sem)
 742                 return AE_BAD_PARAMETER;
 743
 744         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 745
 746         kfree(sem);
 747         sem = NULL;
 748
 749         return AE_OK;
 750 }
 751
 752 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 753
 754 /*
 755  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 756  * improvise.  The process is to sleep for one scheduler quantum
 757  * until the semaphore becomes available.  Downside is that this
 758  * may result in starvation for timeout-based waits when there's
 759  * lots of semaphore activity.
 760  *
 761  * TODO: Support for units > 1?
 762  */
 763 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 764 {
 765         acpi_status status = AE_OK;
 766         struct semaphore *sem = (struct semaphore *)handle;
 767         int ret = 0;
 768
 769
 770         if (!sem || (units < 1))
 771                 return AE_BAD_PARAMETER;
 772
 773         if (units > 1)
 774                 return AE_SUPPORT;
 775
 776         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 777                           handle, units, timeout));
 778
 779         /*
 780          * This can be called during resume with interrupts off.
 781          * Like boot-time, we should be single threaded and will
 782          * always get the lock if we try -- timeout or not.
 783          * If this doesn't succeed, then we will oops courtesy of
 784          * might_sleep() in down().
 785          */
 786         if (!down_trylock(sem))
 787                 return AE_OK;
 788
 789         switch (timeout) {
 790                 /*
 791                  * No Wait:
 792                  * --------
 793                  * A zero timeout value indicates that we shouldn't wait - just
 794                  * acquire the semaphore if available otherwise return AE_TIME
 795                  * (a.k.a. 'would block').
 796                  */
 797         case 0:
 798                 if (down_trylock(sem))
 799                         status = AE_TIME;
 800                 break;
 801
 802                 /*
 803                  * Wait Indefinitely:
 804                  * ------------------
 805                  */
 806         case ACPI_WAIT_FOREVER:
 807                 down(sem);
 808                 break;
 809
 810                 /*
 811                  * Wait w/ Timeout:
 812                  * ----------------
 813                  */
 814         default:
 815                 // TODO: A better timeout algorithm?
 816                 {
 817                         int i = 0;
 818                         static const int quantum_ms = 1000 / HZ;
 819
 820                         ret = down_trylock(sem);
 821                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 822                                 schedule_timeout_interruptible(1);
 823                                 ret = down_trylock(sem);
 824                         }
 825
 826                         if (ret != 0)
 827                                 status = AE_TIME;
 828                 }
 829                 break;
 830         }
 831
 832         if (ACPI_FAILURE(status)) {
 833                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 834                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 835                                   handle, units, timeout,
 836                                   acpi_format_exception(status)));
 837         } else {
 838                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 839                                   "Acquired semaphore[%p|%d|%d]", handle,
 840                                   units, timeout));
 841         }
 842
 843         return status;
 844 }
 845
 846 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 847
 848 /*
 849  * TODO: Support for units > 1?
 850  */
 851 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 852 {
 853         struct semaphore *sem = (struct semaphore *)handle;
 854
 855
 856         if (!sem || (units < 1))
 857                 return AE_BAD_PARAMETER;
 858
 859         if (units > 1)
 860                 return AE_SUPPORT;
 861
 862         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 863                           units));
 864
 865         up(sem);
 866
 867         return AE_OK;
 868 }
 869
 870 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 871
 872 #ifdef ACPI_FUTURE_USAGE
 873 u32 acpi_os_get_line(char *buffer)
 874 {
 875
 876 #ifdef ENABLE_DEBUGGER
 877         if (acpi_in_debugger) {
 878                 u32 chars;
 879
 880                 kdb_read(buffer, sizeof(line_buf));
 881
 882                 /* remove the CR kdb includes */
 883                 chars = strlen(buffer) - 1;
 884                 buffer[chars] = '\0';
 885         }
 886 #endif
 887
 888         return 0;
 889 }
 890 #endif                          /*  ACPI_FUTURE_USAGE  */
 891
 892 acpi_status acpi_os_signal(u32 function, void *info)
 893 {
 894         switch (function) {
 895         case ACPI_SIGNAL_FATAL:
 896                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 897                 break;
 898         case ACPI_SIGNAL_BREAKPOINT:
 899                 /*
 900                  * AML Breakpoint
 901                  * ACPI spec. says to treat it as a NOP unless
 902                  * you are debugging.  So if/when we integrate
 903                  * AML debugger into the kernel debugger its
 904                  * hook will go here.  But until then it is
 905                  * not useful to print anything on breakpoints.
 906                  */
 907                 break;
 908         default:
 909                 break;
 910         }
 911
 912         return AE_OK;
 913 }
 914
 915 EXPORT_SYMBOL(acpi_os_signal);
 916
 917 static int __init acpi_os_name_setup(char *str)
 918 {
 919         char *p = acpi_os_name;
 920         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 921
 922         if (!str || !*str)
 923                 return 0;
 924
 925         for (; count-- && str && *str; str++) {
 926                 if (isalnum(*str) || *str == ' ' || *str == ':')
 927                         *p++ = *str;
 928                 else if (*str == '\'' || *str == '"')
 929                         continue;
 930                 else
 931                         break;
 932         }
 933         *p = 0;
 934
 935         return 1;
 936
 937 }
 938
 939 __setup("acpi_os_name=", acpi_os_name_setup);
 940
 941 static void enable_osi_linux(int enable) {
 942
 943         if (osi_linux != enable)
 944                 printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",
 945                         enable ? "En": "Dis");
 946
 947         osi_linux = enable;
 948         return;
 949 }
 950
 951 /*
 952  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 953  *
 954  * empty string disables _OSI
 955  * string starting with '!' disables that string
 956  * otherwise string is added to list, augmenting built-in strings
 957  */
 958 static int __init acpi_osi_setup(char *str)
 959 {
 960         if (str == NULL || *str == '\0') {
 961                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 962                 acpi_gbl_create_osi_method = FALSE;
 963         } else if (!strcmp("!Linux", str)) {
 964                 enable_osi_linux(0);
 965         } else if (*str == '!') {
 966                 if (acpi_osi_invalidate(++str) == AE_OK)
 967                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
 968         } else if (!strcmp("Linux", str)) {
 969                 enable_osi_linux(1);
 970         } else if (*osi_additional_string == '\0') {
 971                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
 972                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
 973         }
 974
 975         return 1;
 976 }
 977
 978 __setup("acpi_osi=", acpi_osi_setup);
 979
 980 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 981 static int __init acpi_serialize_setup(char *str)
 982 {
 983         printk(KERN_INFO PREFIX "serialize enabled\n");
 984
 985         acpi_gbl_all_methods_serialized = TRUE;
 986
 987         return 1;
 988 }
 989
 990 __setup("acpi_serialize", acpi_serialize_setup);
 991
 992 /*
 993  * Wake and Run-Time GPES are expected to be separate.
 994  * We disable wake-GPEs at run-time to prevent spurious
 995  * interrupts.
 996  *
 997  * However, if a system exists that shares Wake and
 998  * Run-time events on the same GPE this flag is available
 999  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1000  */
1001 static int __init acpi_wake_gpes_always_on_setup(char *str)
1002 {
1003         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1004
1005         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1006
1007         return 1;
1008 }
1009
1010 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1011
1012 /*
1013  * Acquire a spinlock.
1014  *
1015  * handle is a pointer to the spinlock_t.
1016  */
1017
1018 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1019 {
1020         acpi_cpu_flags flags;
1021         spin_lock_irqsave(lockp, flags);
1022         return flags;
1023 }
1024
1025 /*
1026  * Release a spinlock. See above.
1027  */
1028
1029 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1030 {
1031         spin_unlock_irqrestore(lockp, flags);
1032 }
1033
1034 #ifndef ACPI_USE_LOCAL_CACHE
1035
1036 /*******************************************************************************
1037  *
1038  * FUNCTION:    acpi_os_create_cache
1039  *
1040  * PARAMETERS:  name      - Ascii name for the cache
1041  *              size      - Size of each cached object
1042  *              depth     - Maximum depth of the cache (in objects) <ignored>
1043  *              cache     - Where the new cache object is returned
1044  *
1045  * RETURN:      status
1046  *
1047  * DESCRIPTION: Create a cache object
1048  *
1049  ******************************************************************************/
1050
1051 acpi_status
1052 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1053 {
1054         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1055         if (*cache == NULL)
1056                 return AE_ERROR;
1057         else
1058                 return AE_OK;
1059 }
1060
1061 /*******************************************************************************
1062  *
1063  * FUNCTION:    acpi_os_purge_cache
1064  *
1065  * PARAMETERS:  Cache           - Handle to cache object
1066  *
1067  * RETURN:      Status
1068  *
1069  * DESCRIPTION: Free all objects within the requested cache.
1070  *
1071  ******************************************************************************/
1072
1073 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1074 {
1075         kmem_cache_shrink(cache);
1076         return (AE_OK);
1077 }
1078
1079 /*******************************************************************************
1080  *
1081  * FUNCTION:    acpi_os_delete_cache
1082  *
1083  * PARAMETERS:  Cache           - Handle to cache object
1084  *
1085  * RETURN:      Status
1086  *
1087  * DESCRIPTION: Free all objects within the requested cache and delete the
1088  *              cache object.
1089  *
1090  ******************************************************************************/
1091
1092 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1093 {
1094         kmem_cache_destroy(cache);
1095         return (AE_OK);
1096 }
1097
1098 /*******************************************************************************
1099  *
1100  * FUNCTION:    acpi_os_release_object
1101  *
1102  * PARAMETERS:  Cache       - Handle to cache object
1103  *              Object      - The object to be released
1104  *
1105  * RETURN:      None
1106  *
1107  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1108  *              the object is deleted.
1109  *
1110  ******************************************************************************/
1111
1112 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1113 {
1114         kmem_cache_free(cache, object);
1115         return (AE_OK);
1116 }
1117
1118 /******************************************************************************
1119  *
1120  * FUNCTION:    acpi_os_validate_interface
1121  *
1122  * PARAMETERS:  interface           - Requested interface to be validated
1123  *
1124  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1125  *
1126  * DESCRIPTION: Match an interface string to the interfaces supported by the
1127  *              host. Strings originate from an AML call to the _OSI method.
1128  *
1129  *****************************************************************************/
1130
1131 acpi_status
1132 acpi_os_validate_interface (char *interface)
1133 {
1134         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1135                 return AE_OK;
1136         if (!strcmp("Linux", interface)) {
1137                 printk(KERN_WARNING PREFIX
1138                         "System BIOS is requesting _OSI(Linux)\n");
1139                 printk(KERN_WARNING PREFIX
1140                         "If \"acpi_osi=Linux\" works better,\n"
1141                         "Please send dmidecode "
1142                         "to linux-acpi@vger.kernel.org\n");
1143                 if(osi_linux)
1144                         return AE_OK;
1145         }
1146         return AE_SUPPORT;
1147 }
1148
1149 /******************************************************************************
1150  *
1151  * FUNCTION:    acpi_os_validate_address
1152  *
1153  * PARAMETERS:  space_id             - ACPI space ID
1154  *              address             - Physical address
1155  *              length              - Address length
1156  *
1157  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1158  *              should return AE_AML_ILLEGAL_ADDRESS.
1159  *
1160  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1161  *              the addresses accessed by AML operation regions.
1162  *
1163  *****************************************************************************/
1164
1165 acpi_status
1166 acpi_os_validate_address (
1167     u8                   space_id,
1168     acpi_physical_address   address,
1169     acpi_size               length)
1170 {
1171
1172     return AE_OK;
1173 }
1174
1175 #ifdef CONFIG_DMI
1176 static int dmi_osi_linux(const struct dmi_system_id *d)
1177 {
1178         printk(KERN_NOTICE "%s detected: enabling _OSI(Linux)\n", d->ident);
1179         enable_osi_linux(1);
1180         return 0;
1181 }
1182
1183 static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {
1184         /*
1185          * Boxes that need _OSI(Linux)
1186          */
1187         {
1188          .callback = dmi_osi_linux,
1189          .ident = "Intel Napa CRB",
1190          .matches = {
1191                      DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
1192                      DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),
1193                      },
1194          },
1195         {}
1196 };
1197 #endif /* CONFIG_DMI */
1198
1199 #endif