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/workqueue.h>
  37 #include <linux/nmi.h>
  38 #include <linux/acpi.h>
  39 #include <acpi/acpi.h>
  40 #include <asm/io.h>
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/processor.h>
  43 #include <asm/uaccess.h>
  44
  45 #include <linux/efi.h>
  46
  47 #define _COMPONENT              ACPI_OS_SERVICES
  48 ACPI_MODULE_NAME("osl");
  49 #define PREFIX          "ACPI: "
  50 struct acpi_os_dpc {
  51         acpi_osd_exec_callback function;
  52         void *context;
  53         struct work_struct work;
  54 };
  55
  56 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  57 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  58 #endif
  59
  60 #ifdef ENABLE_DEBUGGER
  61 #include <linux/kdb.h>
  62
  63 /* stuff for debugger support */
  64 int acpi_in_debugger;
  65 EXPORT_SYMBOL(acpi_in_debugger);
  66
  67 extern char line_buf[80];
  68 #endif                          /*ENABLE_DEBUGGER */
  69
  70 static unsigned int acpi_irq_irq;
  71 static acpi_osd_handler acpi_irq_handler;
  72 static void *acpi_irq_context;
  73 static struct workqueue_struct *kacpid_wq;
  74 static struct workqueue_struct *kacpi_notify_wq;
  75
  76 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  77 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  78
  79 static void __init acpi_request_region (struct acpi_generic_address *addr,
  80         unsigned int length, char *desc)
  81 {
  82         struct resource *res;
  83
  84         if (!addr->address || !length)
  85                 return;
  86
  87         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  88                 res = request_region(addr->address, length, desc);
  89         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  90                 res = request_mem_region(addr->address, length, desc);
  91 }
  92
  93 static int __init acpi_reserve_resources(void)
  94 {
  95         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
  96                 "ACPI PM1a_EVT_BLK");
  97
  98         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
  99                 "ACPI PM1b_EVT_BLK");
 100
 101         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 102                 "ACPI PM1a_CNT_BLK");
 103
 104         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 105                 "ACPI PM1b_CNT_BLK");
 106
 107         if (acpi_gbl_FADT.pm_timer_length == 4)
 108                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 109
 110         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 111                 "ACPI PM2_CNT_BLK");
 112
 113         /* Length of GPE blocks must be a non-negative multiple of 2 */
 114
 115         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 116                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 117                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 118
 119         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 120                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 121                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 122
 123         return 0;
 124 }
 125 device_initcall(acpi_reserve_resources);
 126
 127 acpi_status acpi_os_initialize(void)
 128 {
 129         return AE_OK;
 130 }
 131
 132 acpi_status acpi_os_initialize1(void)
 133 {
 134         /*
 135          * Initialize PCI configuration space access, as we'll need to access
 136          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 137          */
 138         if (!raw_pci_ops) {
 139                 printk(KERN_ERR PREFIX
 140                        "Access to PCI configuration space unavailable\n");
 141                 return AE_NULL_ENTRY;
 142         }
 143         kacpid_wq = create_singlethread_workqueue("kacpid");
 144         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 145         BUG_ON(!kacpid_wq);
 146         BUG_ON(!kacpi_notify_wq);
 147         return AE_OK;
 148 }
 149
 150 acpi_status acpi_os_terminate(void)
 151 {
 152         if (acpi_irq_handler) {
 153                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 154                                                  acpi_irq_handler);
 155         }
 156
 157         destroy_workqueue(kacpid_wq);
 158         destroy_workqueue(kacpi_notify_wq);
 159
 160         return AE_OK;
 161 }
 162
 163 void acpi_os_printf(const char *fmt, ...)
 164 {
 165         va_list args;
 166         va_start(args, fmt);
 167         acpi_os_vprintf(fmt, args);
 168         va_end(args);
 169 }
 170
 171 EXPORT_SYMBOL(acpi_os_printf);
 172
 173 void acpi_os_vprintf(const char *fmt, va_list args)
 174 {
 175         static char buffer[512];
 176
 177         vsprintf(buffer, fmt, args);
 178
 179 #ifdef ENABLE_DEBUGGER
 180         if (acpi_in_debugger) {
 181                 kdb_printf("%s", buffer);
 182         } else {
 183                 printk("%s", buffer);
 184         }
 185 #else
 186         printk("%s", buffer);
 187 #endif
 188 }
 189
 190 acpi_physical_address __init acpi_os_get_root_pointer(void)
 191 {
 192         if (efi_enabled) {
 193                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 194                         return efi.acpi20;
 195                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 196                         return efi.acpi;
 197                 else {
 198                         printk(KERN_ERR PREFIX
 199                                "System description tables not found\n");
 200                         return 0;
 201                 }
 202         } else
 203                 return acpi_find_rsdp();
 204 }
 205
 206 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 207 {
 208         if (phys > ULONG_MAX) {
 209                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 210                 return NULL;
 211         }
 212         if (acpi_gbl_permanent_mmap)
 213                 /*
 214                 * ioremap checks to ensure this is in reserved space
 215                 */
 216                 return ioremap((unsigned long)phys, size);
 217         else
 218                 return __acpi_map_table((unsigned long)phys, size);
 219 }
 220 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 221
 222 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 223 {
 224         if (acpi_gbl_permanent_mmap) {
 225                 iounmap(virt);
 226         }
 227 }
 228 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 229
 230 #ifdef ACPI_FUTURE_USAGE
 231 acpi_status
 232 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 233 {
 234         if (!phys || !virt)
 235                 return AE_BAD_PARAMETER;
 236
 237         *phys = virt_to_phys(virt);
 238
 239         return AE_OK;
 240 }
 241 #endif
 242
 243 #define ACPI_MAX_OVERRIDE_LEN 100
 244
 245 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 246
 247 acpi_status
 248 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 249                             acpi_string * new_val)
 250 {
 251         if (!init_val || !new_val)
 252                 return AE_BAD_PARAMETER;
 253
 254         *new_val = NULL;
 255         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 256                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 257                        acpi_os_name);
 258                 *new_val = acpi_os_name;
 259         }
 260
 261         return AE_OK;
 262 }
 263
 264 acpi_status
 265 acpi_os_table_override(struct acpi_table_header * existing_table,
 266                        struct acpi_table_header ** new_table)
 267 {
 268         if (!existing_table || !new_table)
 269                 return AE_BAD_PARAMETER;
 270
 271 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 272         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 273                 *new_table = (struct acpi_table_header *)AmlCode;
 274         else
 275                 *new_table = NULL;
 276 #else
 277         *new_table = NULL;
 278 #endif
 279         return AE_OK;
 280 }
 281
 282 static irqreturn_t acpi_irq(int irq, void *dev_id)
 283 {
 284         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 285 }
 286
 287 acpi_status
 288 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 289                                   void *context)
 290 {
 291         unsigned int irq;
 292
 293         /*
 294          * Ignore the GSI from the core, and use the value in our copy of the
 295          * FADT. It may not be the same if an interrupt source override exists
 296          * for the SCI.
 297          */
 298         gsi = acpi_gbl_FADT.sci_interrupt;
 299         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 300                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 301                        gsi);
 302                 return AE_OK;
 303         }
 304
 305         acpi_irq_handler = handler;
 306         acpi_irq_context = context;
 307         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 308                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 309                 return AE_NOT_ACQUIRED;
 310         }
 311         acpi_irq_irq = irq;
 312
 313         return AE_OK;
 314 }
 315
 316 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 317 {
 318         if (irq) {
 319                 free_irq(irq, acpi_irq);
 320                 acpi_irq_handler = NULL;
 321                 acpi_irq_irq = 0;
 322         }
 323
 324         return AE_OK;
 325 }
 326
 327 /*
 328  * Running in interpreter thread context, safe to sleep
 329  */
 330
 331 void acpi_os_sleep(acpi_integer ms)
 332 {
 333         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 334 }
 335
 336 EXPORT_SYMBOL(acpi_os_sleep);
 337
 338 void acpi_os_stall(u32 us)
 339 {
 340         while (us) {
 341                 u32 delay = 1000;
 342
 343                 if (delay > us)
 344                         delay = us;
 345                 udelay(delay);
 346                 touch_nmi_watchdog();
 347                 us -= delay;
 348         }
 349 }
 350
 351 EXPORT_SYMBOL(acpi_os_stall);
 352
 353 /*
 354  * Support ACPI 3.0 AML Timer operand
 355  * Returns 64-bit free-running, monotonically increasing timer
 356  * with 100ns granularity
 357  */
 358 u64 acpi_os_get_timer(void)
 359 {
 360         static u64 t;
 361
 362 #ifdef  CONFIG_HPET
 363         /* TBD: use HPET if available */
 364 #endif
 365
 366 #ifdef  CONFIG_X86_PM_TIMER
 367         /* TBD: default to PM timer if HPET was not available */
 368 #endif
 369         if (!t)
 370                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 371
 372         return ++t;
 373 }
 374
 375 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 376 {
 377         u32 dummy;
 378
 379         if (!value)
 380                 value = &dummy;
 381
 382         switch (width) {
 383         case 8:
 384                 *(u8 *) value = inb(port);
 385                 break;
 386         case 16:
 387                 *(u16 *) value = inw(port);
 388                 break;
 389         case 32:
 390                 *(u32 *) value = inl(port);
 391                 break;
 392         default:
 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         switch (width) {
 404         case 8:
 405                 outb(value, port);
 406                 break;
 407         case 16:
 408                 outw(value, port);
 409                 break;
 410         case 32:
 411                 outl(value, port);
 412                 break;
 413         default:
 414                 BUG();
 415         }
 416
 417         return AE_OK;
 418 }
 419
 420 EXPORT_SYMBOL(acpi_os_write_port);
 421
 422 acpi_status
 423 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 424 {
 425         u32 dummy;
 426         void __iomem *virt_addr;
 427
 428         virt_addr = ioremap(phys_addr, width);
 429         if (!value)
 430                 value = &dummy;
 431
 432         switch (width) {
 433         case 8:
 434                 *(u8 *) value = readb(virt_addr);
 435                 break;
 436         case 16:
 437                 *(u16 *) value = readw(virt_addr);
 438                 break;
 439         case 32:
 440                 *(u32 *) value = readl(virt_addr);
 441                 break;
 442         default:
 443                 BUG();
 444         }
 445
 446         iounmap(virt_addr);
 447
 448         return AE_OK;
 449 }
 450
 451 acpi_status
 452 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 453 {
 454         void __iomem *virt_addr;
 455
 456         virt_addr = ioremap(phys_addr, width);
 457
 458         switch (width) {
 459         case 8:
 460                 writeb(value, virt_addr);
 461                 break;
 462         case 16:
 463                 writew(value, virt_addr);
 464                 break;
 465         case 32:
 466                 writel(value, virt_addr);
 467                 break;
 468         default:
 469                 BUG();
 470         }
 471
 472         iounmap(virt_addr);
 473
 474         return AE_OK;
 475 }
 476
 477 acpi_status
 478 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 479                                void *value, u32 width)
 480 {
 481         int result, size;
 482
 483         if (!value)
 484                 return AE_BAD_PARAMETER;
 485
 486         switch (width) {
 487         case 8:
 488                 size = 1;
 489                 break;
 490         case 16:
 491                 size = 2;
 492                 break;
 493         case 32:
 494                 size = 4;
 495                 break;
 496         default:
 497                 return AE_ERROR;
 498         }
 499
 500         BUG_ON(!raw_pci_ops);
 501
 502         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 503                                    PCI_DEVFN(pci_id->device, pci_id->function),
 504                                    reg, size, value);
 505
 506         return (result ? AE_ERROR : AE_OK);
 507 }
 508
 509 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 510
 511 acpi_status
 512 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 513                                 acpi_integer value, u32 width)
 514 {
 515         int result, size;
 516
 517         switch (width) {
 518         case 8:
 519                 size = 1;
 520                 break;
 521         case 16:
 522                 size = 2;
 523                 break;
 524         case 32:
 525                 size = 4;
 526                 break;
 527         default:
 528                 return AE_ERROR;
 529         }
 530
 531         BUG_ON(!raw_pci_ops);
 532
 533         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 534                                     PCI_DEVFN(pci_id->device, pci_id->function),
 535                                     reg, size, value);
 536
 537         return (result ? AE_ERROR : AE_OK);
 538 }
 539
 540 /* TODO: Change code to take advantage of driver model more */
 541 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 542                                     acpi_handle chandle,        /* current node */
 543                                     struct acpi_pci_id **id,
 544                                     int *is_bridge, u8 * bus_number)
 545 {
 546         acpi_handle handle;
 547         struct acpi_pci_id *pci_id = *id;
 548         acpi_status status;
 549         unsigned long temp;
 550         acpi_object_type type;
 551         u8 tu8;
 552
 553         acpi_get_parent(chandle, &handle);
 554         if (handle != rhandle) {
 555                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 556                                         bus_number);
 557
 558                 status = acpi_get_type(handle, &type);
 559                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 560                         return;
 561
 562                 status =
 563                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 564                                           &temp);
 565                 if (ACPI_SUCCESS(status)) {
 566                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 567                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 568
 569                         if (*is_bridge)
 570                                 pci_id->bus = *bus_number;
 571
 572                         /* any nicer way to get bus number of bridge ? */
 573                         status =
 574                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 575                                                            8);
 576                         if (ACPI_SUCCESS(status)
 577                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 578                                 status =
 579                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 580                                                                    &tu8, 8);
 581                                 if (!ACPI_SUCCESS(status)) {
 582                                         /* Certainly broken...  FIX ME */
 583                                         return;
 584                                 }
 585                                 *is_bridge = 1;
 586                                 pci_id->bus = tu8;
 587                                 status =
 588                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 589                                                                    &tu8, 8);
 590                                 if (ACPI_SUCCESS(status)) {
 591                                         *bus_number = tu8;
 592                                 }
 593                         } else
 594                                 *is_bridge = 0;
 595                 }
 596         }
 597 }
 598
 599 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 600                            acpi_handle chandle, /* current node */
 601                            struct acpi_pci_id **id)
 602 {
 603         int is_bridge = 1;
 604         u8 bus_number = (*id)->bus;
 605
 606         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 607 }
 608
 609 static void acpi_os_execute_deferred(struct work_struct *work)
 610 {
 611         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 612         if (!dpc) {
 613                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 614                 return;
 615         }
 616
 617         dpc->function(dpc->context);
 618         kfree(dpc);
 619
 620         /* Yield cpu to notify thread */
 621         cond_resched();
 622
 623         return;
 624 }
 625
 626 static void acpi_os_execute_notify(struct work_struct *work)
 627 {
 628         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 629
 630         if (!dpc) {
 631                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 632                 return;
 633         }
 634
 635         dpc->function(dpc->context);
 636
 637         kfree(dpc);
 638
 639         return;
 640 }
 641
 642 /*******************************************************************************
 643  *
 644  * FUNCTION:    acpi_os_execute
 645  *
 646  * PARAMETERS:  Type               - Type of the callback
 647  *              Function           - Function to be executed
 648  *              Context            - Function parameters
 649  *
 650  * RETURN:      Status
 651  *
 652  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 653  *              immediately executes function on a separate thread.
 654  *
 655  ******************************************************************************/
 656
 657 acpi_status acpi_os_execute(acpi_execute_type type,
 658                             acpi_osd_exec_callback function, void *context)
 659 {
 660         acpi_status status = AE_OK;
 661         struct acpi_os_dpc *dpc;
 662
 663         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 664                           "Scheduling function [%p(%p)] for deferred execution.\n",
 665                           function, context));
 666
 667         if (!function)
 668                 return AE_BAD_PARAMETER;
 669
 670         /*
 671          * Allocate/initialize DPC structure.  Note that this memory will be
 672          * freed by the callee.  The kernel handles the work_struct list  in a
 673          * way that allows us to also free its memory inside the callee.
 674          * Because we may want to schedule several tasks with different
 675          * parameters we can't use the approach some kernel code uses of
 676          * having a static work_struct.
 677          */
 678
 679         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 680         if (!dpc)
 681                 return_ACPI_STATUS(AE_NO_MEMORY);
 682
 683         dpc->function = function;
 684         dpc->context = context;
 685
 686         if (type == OSL_NOTIFY_HANDLER) {
 687                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 688                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 689                         status = AE_ERROR;
 690                         kfree(dpc);
 691                 }
 692         } else {
 693                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 694                 if (!queue_work(kacpid_wq, &dpc->work)) {
 695                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 696                                   "Call to queue_work() failed.\n"));
 697                         status = AE_ERROR;
 698                         kfree(dpc);
 699                 }
 700         }
 701         return_ACPI_STATUS(status);
 702 }
 703
 704 EXPORT_SYMBOL(acpi_os_execute);
 705
 706 void acpi_os_wait_events_complete(void *context)
 707 {
 708         flush_workqueue(kacpid_wq);
 709 }
 710
 711 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 712
 713 /*
 714  * Allocate the memory for a spinlock and initialize it.
 715  */
 716 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 717 {
 718         spin_lock_init(*handle);
 719
 720         return AE_OK;
 721 }
 722
 723 /*
 724  * Deallocate the memory for a spinlock.
 725  */
 726 void acpi_os_delete_lock(acpi_spinlock handle)
 727 {
 728         return;
 729 }
 730
 731 acpi_status
 732 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 733 {
 734         struct semaphore *sem = NULL;
 735
 736
 737         sem = acpi_os_allocate(sizeof(struct semaphore));
 738         if (!sem)
 739                 return AE_NO_MEMORY;
 740         memset(sem, 0, sizeof(struct semaphore));
 741
 742         sema_init(sem, initial_units);
 743
 744         *handle = (acpi_handle *) sem;
 745
 746         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 747                           *handle, initial_units));
 748
 749         return AE_OK;
 750 }
 751
 752 EXPORT_SYMBOL(acpi_os_create_semaphore);
 753
 754 /*
 755  * TODO: A better way to delete semaphores?  Linux doesn't have a
 756  * 'delete_semaphore()' function -- may result in an invalid
 757  * pointer dereference for non-synchronized consumers.  Should
 758  * we at least check for blocked threads and signal/cancel them?
 759  */
 760
 761 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 762 {
 763         struct semaphore *sem = (struct semaphore *)handle;
 764
 765
 766         if (!sem)
 767                 return AE_BAD_PARAMETER;
 768
 769         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 770
 771         kfree(sem);
 772         sem = NULL;
 773
 774         return AE_OK;
 775 }
 776
 777 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 778
 779 /*
 780  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 781  * improvise.  The process is to sleep for one scheduler quantum
 782  * until the semaphore becomes available.  Downside is that this
 783  * may result in starvation for timeout-based waits when there's
 784  * lots of semaphore activity.
 785  *
 786  * TODO: Support for units > 1?
 787  */
 788 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 789 {
 790         acpi_status status = AE_OK;
 791         struct semaphore *sem = (struct semaphore *)handle;
 792         int ret = 0;
 793
 794
 795         if (!sem || (units < 1))
 796                 return AE_BAD_PARAMETER;
 797
 798         if (units > 1)
 799                 return AE_SUPPORT;
 800
 801         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 802                           handle, units, timeout));
 803
 804         /*
 805          * This can be called during resume with interrupts off.
 806          * Like boot-time, we should be single threaded and will
 807          * always get the lock if we try -- timeout or not.
 808          * If this doesn't succeed, then we will oops courtesy of
 809          * might_sleep() in down().
 810          */
 811         if (!down_trylock(sem))
 812                 return AE_OK;
 813
 814         switch (timeout) {
 815                 /*
 816                  * No Wait:
 817                  * --------
 818                  * A zero timeout value indicates that we shouldn't wait - just
 819                  * acquire the semaphore if available otherwise return AE_TIME
 820                  * (a.k.a. 'would block').
 821                  */
 822         case 0:
 823                 if (down_trylock(sem))
 824                         status = AE_TIME;
 825                 break;
 826
 827                 /*
 828                  * Wait Indefinitely:
 829                  * ------------------
 830                  */
 831         case ACPI_WAIT_FOREVER:
 832                 down(sem);
 833                 break;
 834
 835                 /*
 836                  * Wait w/ Timeout:
 837                  * ----------------
 838                  */
 839         default:
 840                 // TODO: A better timeout algorithm?
 841                 {
 842                         int i = 0;
 843                         static const int quantum_ms = 1000 / HZ;
 844
 845                         ret = down_trylock(sem);
 846                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 847                                 schedule_timeout_interruptible(1);
 848                                 ret = down_trylock(sem);
 849                         }
 850
 851                         if (ret != 0)
 852                                 status = AE_TIME;
 853                 }
 854                 break;
 855         }
 856
 857         if (ACPI_FAILURE(status)) {
 858                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 859                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 860                                   handle, units, timeout,
 861                                   acpi_format_exception(status)));
 862         } else {
 863                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 864                                   "Acquired semaphore[%p|%d|%d]", handle,
 865                                   units, timeout));
 866         }
 867
 868         return status;
 869 }
 870
 871 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 872
 873 /*
 874  * TODO: Support for units > 1?
 875  */
 876 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 877 {
 878         struct semaphore *sem = (struct semaphore *)handle;
 879
 880
 881         if (!sem || (units < 1))
 882                 return AE_BAD_PARAMETER;
 883
 884         if (units > 1)
 885                 return AE_SUPPORT;
 886
 887         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 888                           units));
 889
 890         up(sem);
 891
 892         return AE_OK;
 893 }
 894
 895 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 896
 897 #ifdef ACPI_FUTURE_USAGE
 898 u32 acpi_os_get_line(char *buffer)
 899 {
 900
 901 #ifdef ENABLE_DEBUGGER
 902         if (acpi_in_debugger) {
 903                 u32 chars;
 904
 905                 kdb_read(buffer, sizeof(line_buf));
 906
 907                 /* remove the CR kdb includes */
 908                 chars = strlen(buffer) - 1;
 909                 buffer[chars] = '\0';
 910         }
 911 #endif
 912
 913         return 0;
 914 }
 915 #endif                          /*  ACPI_FUTURE_USAGE  */
 916
 917 acpi_status acpi_os_signal(u32 function, void *info)
 918 {
 919         switch (function) {
 920         case ACPI_SIGNAL_FATAL:
 921                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 922                 break;
 923         case ACPI_SIGNAL_BREAKPOINT:
 924                 /*
 925                  * AML Breakpoint
 926                  * ACPI spec. says to treat it as a NOP unless
 927                  * you are debugging.  So if/when we integrate
 928                  * AML debugger into the kernel debugger its
 929                  * hook will go here.  But until then it is
 930                  * not useful to print anything on breakpoints.
 931                  */
 932                 break;
 933         default:
 934                 break;
 935         }
 936
 937         return AE_OK;
 938 }
 939
 940 EXPORT_SYMBOL(acpi_os_signal);
 941
 942 static int __init acpi_os_name_setup(char *str)
 943 {
 944         char *p = acpi_os_name;
 945         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 946
 947         if (!str || !*str)
 948                 return 0;
 949
 950         for (; count-- && str && *str; str++) {
 951                 if (isalnum(*str) || *str == ' ' || *str == ':')
 952                         *p++ = *str;
 953                 else if (*str == '\'' || *str == '"')
 954                         continue;
 955                 else
 956                         break;
 957         }
 958         *p = 0;
 959
 960         return 1;
 961
 962 }
 963
 964 __setup("acpi_os_name=", acpi_os_name_setup);
 965
 966 /*
 967  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 968  *
 969  * empty string disables _OSI
 970  * string starting with '!' disables that string
 971  * otherwise string is added to list, augmenting built-in strings
 972  */
 973 static int __init acpi_osi_setup(char *str)
 974 {
 975         if (str == NULL || *str == '\0') {
 976                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 977                 acpi_gbl_create_osi_method = FALSE;
 978         } else if (*str == '!') {
 979                 if (acpi_osi_invalidate(++str) == AE_OK)
 980                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
 981         } else if (*osi_additional_string == '\0') {
 982                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
 983                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
 984         }
 985
 986         return 1;
 987 }
 988
 989 __setup("acpi_osi=", acpi_osi_setup);
 990
 991 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 992 static int __init acpi_serialize_setup(char *str)
 993 {
 994         printk(KERN_INFO PREFIX "serialize enabled\n");
 995
 996         acpi_gbl_all_methods_serialized = TRUE;
 997
 998         return 1;
 999 }
1000
1001 __setup("acpi_serialize", acpi_serialize_setup);
1002
1003 /*
1004  * Wake and Run-Time GPES are expected to be separate.
1005  * We disable wake-GPEs at run-time to prevent spurious
1006  * interrupts.
1007  *
1008  * However, if a system exists that shares Wake and
1009  * Run-time events on the same GPE this flag is available
1010  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1011  */
1012 static int __init acpi_wake_gpes_always_on_setup(char *str)
1013 {
1014         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1015
1016         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1017
1018         return 1;
1019 }
1020
1021 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1022
1023 /*
1024  * max_cstate is defined in the base kernel so modules can
1025  * change it w/o depending on the state of the processor module.
1026  */
1027 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1028
1029 EXPORT_SYMBOL(max_cstate);
1030
1031 /*
1032  * Acquire a spinlock.
1033  *
1034  * handle is a pointer to the spinlock_t.
1035  */
1036
1037 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1038 {
1039         acpi_cpu_flags flags;
1040         spin_lock_irqsave(lockp, flags);
1041         return flags;
1042 }
1043
1044 /*
1045  * Release a spinlock. See above.
1046  */
1047
1048 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1049 {
1050         spin_unlock_irqrestore(lockp, flags);
1051 }
1052
1053 #ifndef ACPI_USE_LOCAL_CACHE
1054
1055 /*******************************************************************************
1056  *
1057  * FUNCTION:    acpi_os_create_cache
1058  *
1059  * PARAMETERS:  name      - Ascii name for the cache
1060  *              size      - Size of each cached object
1061  *              depth     - Maximum depth of the cache (in objects) <ignored>
1062  *              cache     - Where the new cache object is returned
1063  *
1064  * RETURN:      status
1065  *
1066  * DESCRIPTION: Create a cache object
1067  *
1068  ******************************************************************************/
1069
1070 acpi_status
1071 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1072 {
1073         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1074         if (*cache == NULL)
1075                 return AE_ERROR;
1076         else
1077                 return AE_OK;
1078 }
1079
1080 /*******************************************************************************
1081  *
1082  * FUNCTION:    acpi_os_purge_cache
1083  *
1084  * PARAMETERS:  Cache           - Handle to cache object
1085  *
1086  * RETURN:      Status
1087  *
1088  * DESCRIPTION: Free all objects within the requested cache.
1089  *
1090  ******************************************************************************/
1091
1092 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1093 {
1094         kmem_cache_shrink(cache);
1095         return (AE_OK);
1096 }
1097
1098 /*******************************************************************************
1099  *
1100  * FUNCTION:    acpi_os_delete_cache
1101  *
1102  * PARAMETERS:  Cache           - Handle to cache object
1103  *
1104  * RETURN:      Status
1105  *
1106  * DESCRIPTION: Free all objects within the requested cache and delete the
1107  *              cache object.
1108  *
1109  ******************************************************************************/
1110
1111 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1112 {
1113         kmem_cache_destroy(cache);
1114         return (AE_OK);
1115 }
1116
1117 /*******************************************************************************
1118  *
1119  * FUNCTION:    acpi_os_release_object
1120  *
1121  * PARAMETERS:  Cache       - Handle to cache object
1122  *              Object      - The object to be released
1123  *
1124  * RETURN:      None
1125  *
1126  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1127  *              the object is deleted.
1128  *
1129  ******************************************************************************/
1130
1131 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1132 {
1133         kmem_cache_free(cache, object);
1134         return (AE_OK);
1135 }
1136
1137 /******************************************************************************
1138  *
1139  * FUNCTION:    acpi_os_validate_interface
1140  *
1141  * PARAMETERS:  interface           - Requested interface to be validated
1142  *
1143  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1144  *
1145  * DESCRIPTION: Match an interface string to the interfaces supported by the
1146  *              host. Strings originate from an AML call to the _OSI method.
1147  *
1148  *****************************************************************************/
1149
1150 acpi_status
1151 acpi_os_validate_interface (char *interface)
1152 {
1153         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1154                 return AE_OK;
1155         return AE_SUPPORT;
1156 }
1157
1158 /******************************************************************************
1159  *
1160  * FUNCTION:    acpi_os_validate_address
1161  *
1162  * PARAMETERS:  space_id             - ACPI space ID
1163  *              address             - Physical address
1164  *              length              - Address length
1165  *
1166  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1167  *              should return AE_AML_ILLEGAL_ADDRESS.
1168  *
1169  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1170  *              the addresses accessed by AML operation regions.
1171  *
1172  *****************************************************************************/
1173
1174 acpi_status
1175 acpi_os_validate_address (
1176     u8                   space_id,
1177     acpi_physical_address   address,
1178     acpi_size               length)
1179 {
1180
1181     return AE_OK;
1182 }
1183
1184
1185 #endif