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  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <willy@linux.intel.com>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/highmem.h>
  35 #include <linux/pci.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/kmod.h>
  38 #include <linux/delay.h>
  39 #include <linux/workqueue.h>
  40 #include <linux/nmi.h>
  41 #include <linux/acpi.h>
  42 #include <linux/acpi_io.h>
  43 #include <linux/efi.h>
  44 #include <linux/ioport.h>
  45 #include <linux/list.h>
  46 #include <linux/jiffies.h>
  47 #include <linux/semaphore.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/uaccess.h>
  51
  52 #include <acpi/acpi.h>
  53 #include <acpi/acpi_bus.h>
  54 #include <acpi/processor.h>
  55
  56 #define _COMPONENT              ACPI_OS_SERVICES
  57 ACPI_MODULE_NAME("osl");
  58 #define PREFIX          "ACPI: "
  59 struct acpi_os_dpc {
  60         acpi_osd_exec_callback function;
  61         void *context;
  62         struct work_struct work;
  63         int wait;
  64 };
  65
  66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  68 #endif
  69
  70 #ifdef ENABLE_DEBUGGER
  71 #include <linux/kdb.h>
  72
  73 /* stuff for debugger support */
  74 int acpi_in_debugger;
  75 EXPORT_SYMBOL(acpi_in_debugger);
  76
  77 extern char line_buf[80];
  78 #endif                          /*ENABLE_DEBUGGER */
  79
  80 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  81                                       u32 pm1b_ctrl);
  82
  83 static acpi_osd_handler acpi_irq_handler;
  84 static void *acpi_irq_context;
  85 static struct workqueue_struct *kacpid_wq;
  86 static struct workqueue_struct *kacpi_notify_wq;
  87 struct workqueue_struct *kacpi_hotplug_wq;
  88 EXPORT_SYMBOL(kacpi_hotplug_wq);
  89
  90 /*
  91  * This list of permanent mappings is for memory that may be accessed from
  92  * interrupt context, where we can't do the ioremap().
  93  */
  94 struct acpi_ioremap {
  95         struct list_head list;
  96         void __iomem *virt;
  97         acpi_physical_address phys;
  98         acpi_size size;
  99         unsigned long refcount;
 100 };
 101
 102 static LIST_HEAD(acpi_ioremaps);
 103 static DEFINE_MUTEX(acpi_ioremap_lock);
 104
 105 static void __init acpi_osi_setup_late(void);
 106
 107 /*
 108  * The story of _OSI(Linux)
 109  *
 110  * From pre-history through Linux-2.6.22,
 111  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 112  *
 113  * Unfortunately, reference BIOS writers got wind of this
 114  * and put OSI(Linux) in their example code, quickly exposing
 115  * this string as ill-conceived and opening the door to
 116  * an un-bounded number of BIOS incompatibilities.
 117  *
 118  * For example, OSI(Linux) was used on resume to re-POST a
 119  * video card on one system, because Linux at that time
 120  * could not do a speedy restore in its native driver.
 121  * But then upon gaining quick native restore capability,
 122  * Linux has no way to tell the BIOS to skip the time-consuming
 123  * POST -- putting Linux at a permanent performance disadvantage.
 124  * On another system, the BIOS writer used OSI(Linux)
 125  * to infer native OS support for IPMI!  On other systems,
 126  * OSI(Linux) simply got in the way of Linux claiming to
 127  * be compatible with other operating systems, exposing
 128  * BIOS issues such as skipped device initialization.
 129  *
 130  * So "Linux" turned out to be a really poor chose of
 131  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 132  *
 133  * BIOS writers should NOT query _OSI(Linux) on future systems.
 134  * Linux will complain on the console when it sees it, and return FALSE.
 135  * To get Linux to return TRUE for your system  will require
 136  * a kernel source update to add a DMI entry,
 137  * or boot with "acpi_osi=Linux"
 138  */
 139
 140 static struct osi_linux {
 141         unsigned int    enable:1;
 142         unsigned int    dmi:1;
 143         unsigned int    cmdline:1;
 144 } osi_linux = {0, 0, 0};
 145
 146 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 147 {
 148         if (!strcmp("Linux", interface)) {
 149
 150                 printk_once(KERN_NOTICE FW_BUG PREFIX
 151                         "BIOS _OSI(Linux) query %s%s\n",
 152                         osi_linux.enable ? "honored" : "ignored",
 153                         osi_linux.cmdline ? " via cmdline" :
 154                         osi_linux.dmi ? " via DMI" : "");
 155         }
 156
 157         return supported;
 158 }
 159
 160 static void __init acpi_request_region (struct acpi_generic_address *gas,
 161         unsigned int length, char *desc)
 162 {
 163         u64 addr;
 164
 165         /* Handle possible alignment issues */
 166         memcpy(&addr, &gas->address, sizeof(addr));
 167         if (!addr || !length)
 168                 return;
 169
 170         /* Resources are never freed */
 171         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 172                 request_region(addr, length, desc);
 173         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 174                 request_mem_region(addr, length, desc);
 175 }
 176
 177 static int __init acpi_reserve_resources(void)
 178 {
 179         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 180                 "ACPI PM1a_EVT_BLK");
 181
 182         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 183                 "ACPI PM1b_EVT_BLK");
 184
 185         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 186                 "ACPI PM1a_CNT_BLK");
 187
 188         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 189                 "ACPI PM1b_CNT_BLK");
 190
 191         if (acpi_gbl_FADT.pm_timer_length == 4)
 192                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 193
 194         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 195                 "ACPI PM2_CNT_BLK");
 196
 197         /* Length of GPE blocks must be a non-negative multiple of 2 */
 198
 199         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 200                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 201                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 202
 203         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 204                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 205                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 206
 207         return 0;
 208 }
 209 device_initcall(acpi_reserve_resources);
 210
 211 void acpi_os_printf(const char *fmt, ...)
 212 {
 213         va_list args;
 214         va_start(args, fmt);
 215         acpi_os_vprintf(fmt, args);
 216         va_end(args);
 217 }
 218
 219 void acpi_os_vprintf(const char *fmt, va_list args)
 220 {
 221         static char buffer[512];
 222
 223         vsprintf(buffer, fmt, args);
 224
 225 #ifdef ENABLE_DEBUGGER
 226         if (acpi_in_debugger) {
 227                 kdb_printf("%s", buffer);
 228         } else {
 229                 printk(KERN_CONT "%s", buffer);
 230         }
 231 #else
 232         printk(KERN_CONT "%s", buffer);
 233 #endif
 234 }
 235
 236 #ifdef CONFIG_KEXEC
 237 static unsigned long acpi_rsdp;
 238 static int __init setup_acpi_rsdp(char *arg)
 239 {
 240         acpi_rsdp = simple_strtoul(arg, NULL, 16);
 241         return 0;
 242 }
 243 early_param("acpi_rsdp", setup_acpi_rsdp);
 244 #endif
 245
 246 acpi_physical_address __init acpi_os_get_root_pointer(void)
 247 {
 248 #ifdef CONFIG_KEXEC
 249         if (acpi_rsdp)
 250                 return acpi_rsdp;
 251 #endif
 252
 253         if (efi_enabled) {
 254                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 255                         return efi.acpi20;
 256                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 257                         return efi.acpi;
 258                 else {
 259                         printk(KERN_ERR PREFIX
 260                                "System description tables not found\n");
 261                         return 0;
 262                 }
 263         } else {
 264                 acpi_physical_address pa = 0;
 265
 266                 acpi_find_root_pointer(&pa);
 267                 return pa;
 268         }
 269 }
 270
 271 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 272 static struct acpi_ioremap *
 273 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 274 {
 275         struct acpi_ioremap *map;
 276
 277         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 278                 if (map->phys <= phys &&
 279                     phys + size <= map->phys + map->size)
 280                         return map;
 281
 282         return NULL;
 283 }
 284
 285 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 286 static void __iomem *
 287 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 288 {
 289         struct acpi_ioremap *map;
 290
 291         map = acpi_map_lookup(phys, size);
 292         if (map)
 293                 return map->virt + (phys - map->phys);
 294
 295         return NULL;
 296 }
 297
 298 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 299 {
 300         struct acpi_ioremap *map;
 301         void __iomem *virt = NULL;
 302
 303         mutex_lock(&acpi_ioremap_lock);
 304         map = acpi_map_lookup(phys, size);
 305         if (map) {
 306                 virt = map->virt + (phys - map->phys);
 307                 map->refcount++;
 308         }
 309         mutex_unlock(&acpi_ioremap_lock);
 310         return virt;
 311 }
 312 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 313
 314 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 315 static struct acpi_ioremap *
 316 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 317 {
 318         struct acpi_ioremap *map;
 319
 320         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 321                 if (map->virt <= virt &&
 322                     virt + size <= map->virt + map->size)
 323                         return map;
 324
 325         return NULL;
 326 }
 327
 328 #ifndef CONFIG_IA64
 329 #define should_use_kmap(pfn)   page_is_ram(pfn)
 330 #else
 331 /* ioremap will take care of cache attributes */
 332 #define should_use_kmap(pfn)   0
 333 #endif
 334
 335 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 336 {
 337         unsigned long pfn;
 338
 339         pfn = pg_off >> PAGE_SHIFT;
 340         if (should_use_kmap(pfn)) {
 341                 if (pg_sz > PAGE_SIZE)
 342                         return NULL;
 343                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 344         } else
 345                 return acpi_os_ioremap(pg_off, pg_sz);
 346 }
 347
 348 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 349 {
 350         unsigned long pfn;
 351
 352         pfn = pg_off >> PAGE_SHIFT;
 353         if (should_use_kmap(pfn))
 354                 kunmap(pfn_to_page(pfn));
 355         else
 356                 iounmap(vaddr);
 357 }
 358
 359 void __iomem *__init_refok
 360 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 361 {
 362         struct acpi_ioremap *map;
 363         void __iomem *virt;
 364         acpi_physical_address pg_off;
 365         acpi_size pg_sz;
 366
 367         if (phys > ULONG_MAX) {
 368                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 369                 return NULL;
 370         }
 371
 372         if (!acpi_gbl_permanent_mmap)
 373                 return __acpi_map_table((unsigned long)phys, size);
 374
 375         mutex_lock(&acpi_ioremap_lock);
 376         /* Check if there's a suitable mapping already. */
 377         map = acpi_map_lookup(phys, size);
 378         if (map) {
 379                 map->refcount++;
 380                 goto out;
 381         }
 382
 383         map = kzalloc(sizeof(*map), GFP_KERNEL);
 384         if (!map) {
 385                 mutex_unlock(&acpi_ioremap_lock);
 386                 return NULL;
 387         }
 388
 389         pg_off = round_down(phys, PAGE_SIZE);
 390         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 391         virt = acpi_map(pg_off, pg_sz);
 392         if (!virt) {
 393                 mutex_unlock(&acpi_ioremap_lock);
 394                 kfree(map);
 395                 return NULL;
 396         }
 397
 398         INIT_LIST_HEAD(&map->list);
 399         map->virt = virt;
 400         map->phys = pg_off;
 401         map->size = pg_sz;
 402         map->refcount = 1;
 403
 404         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 405
 406  out:
 407         mutex_unlock(&acpi_ioremap_lock);
 408         return map->virt + (phys - map->phys);
 409 }
 410 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 411
 412 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 413 {
 414         if (!--map->refcount)
 415                 list_del_rcu(&map->list);
 416 }
 417
 418 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 419 {
 420         if (!map->refcount) {
 421                 synchronize_rcu();
 422                 acpi_unmap(map->phys, map->virt);
 423                 kfree(map);
 424         }
 425 }
 426
 427 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 428 {
 429         struct acpi_ioremap *map;
 430
 431         if (!acpi_gbl_permanent_mmap) {
 432                 __acpi_unmap_table(virt, size);
 433                 return;
 434         }
 435
 436         mutex_lock(&acpi_ioremap_lock);
 437         map = acpi_map_lookup_virt(virt, size);
 438         if (!map) {
 439                 mutex_unlock(&acpi_ioremap_lock);
 440                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 441                 return;
 442         }
 443         acpi_os_drop_map_ref(map);
 444         mutex_unlock(&acpi_ioremap_lock);
 445
 446         acpi_os_map_cleanup(map);
 447 }
 448 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 449
 450 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 451 {
 452         if (!acpi_gbl_permanent_mmap)
 453                 __acpi_unmap_table(virt, size);
 454 }
 455
 456 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 457 {
 458         u64 addr;
 459         void __iomem *virt;
 460
 461         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 462                 return 0;
 463
 464         /* Handle possible alignment issues */
 465         memcpy(&addr, &gas->address, sizeof(addr));
 466         if (!addr || !gas->bit_width)
 467                 return -EINVAL;
 468
 469         virt = acpi_os_map_memory(addr, gas->bit_width / 8);
 470         if (!virt)
 471                 return -EIO;
 472
 473         return 0;
 474 }
 475 EXPORT_SYMBOL(acpi_os_map_generic_address);
 476
 477 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 478 {
 479         u64 addr;
 480         struct acpi_ioremap *map;
 481
 482         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 483                 return;
 484
 485         /* Handle possible alignment issues */
 486         memcpy(&addr, &gas->address, sizeof(addr));
 487         if (!addr || !gas->bit_width)
 488                 return;
 489
 490         mutex_lock(&acpi_ioremap_lock);
 491         map = acpi_map_lookup(addr, gas->bit_width / 8);
 492         if (!map) {
 493                 mutex_unlock(&acpi_ioremap_lock);
 494                 return;
 495         }
 496         acpi_os_drop_map_ref(map);
 497         mutex_unlock(&acpi_ioremap_lock);
 498
 499         acpi_os_map_cleanup(map);
 500 }
 501 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 502
 503 #ifdef ACPI_FUTURE_USAGE
 504 acpi_status
 505 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 506 {
 507         if (!phys || !virt)
 508                 return AE_BAD_PARAMETER;
 509
 510         *phys = virt_to_phys(virt);
 511
 512         return AE_OK;
 513 }
 514 #endif
 515
 516 #define ACPI_MAX_OVERRIDE_LEN 100
 517
 518 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 519
 520 acpi_status
 521 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 522                             acpi_string * new_val)
 523 {
 524         if (!init_val || !new_val)
 525                 return AE_BAD_PARAMETER;
 526
 527         *new_val = NULL;
 528         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 529                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 530                        acpi_os_name);
 531                 *new_val = acpi_os_name;
 532         }
 533
 534         return AE_OK;
 535 }
 536
 537 acpi_status
 538 acpi_os_table_override(struct acpi_table_header * existing_table,
 539                        struct acpi_table_header ** new_table)
 540 {
 541         if (!existing_table || !new_table)
 542                 return AE_BAD_PARAMETER;
 543
 544         *new_table = NULL;
 545
 546 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 547         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 548                 *new_table = (struct acpi_table_header *)AmlCode;
 549 #endif
 550         if (*new_table != NULL) {
 551                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 552                            "this is unsafe: tainting kernel\n",
 553                        existing_table->signature,
 554                        existing_table->oem_table_id);
 555                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 556         }
 557         return AE_OK;
 558 }
 559
 560 acpi_status
 561 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 562                                 acpi_physical_address * new_address,
 563                                 u32 *new_table_length)
 564 {
 565         return AE_SUPPORT;
 566 }
 567
 568
 569 static irqreturn_t acpi_irq(int irq, void *dev_id)
 570 {
 571         u32 handled;
 572
 573         handled = (*acpi_irq_handler) (acpi_irq_context);
 574
 575         if (handled) {
 576                 acpi_irq_handled++;
 577                 return IRQ_HANDLED;
 578         } else {
 579                 acpi_irq_not_handled++;
 580                 return IRQ_NONE;
 581         }
 582 }
 583
 584 acpi_status
 585 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 586                                   void *context)
 587 {
 588         unsigned int irq;
 589
 590         acpi_irq_stats_init();
 591
 592         /*
 593          * ACPI interrupts different from the SCI in our copy of the FADT are
 594          * not supported.
 595          */
 596         if (gsi != acpi_gbl_FADT.sci_interrupt)
 597                 return AE_BAD_PARAMETER;
 598
 599         if (acpi_irq_handler)
 600                 return AE_ALREADY_ACQUIRED;
 601
 602         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 603                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 604                        gsi);
 605                 return AE_OK;
 606         }
 607
 608         acpi_irq_handler = handler;
 609         acpi_irq_context = context;
 610         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 611                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 612                 acpi_irq_handler = NULL;
 613                 return AE_NOT_ACQUIRED;
 614         }
 615
 616         return AE_OK;
 617 }
 618
 619 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 620 {
 621         if (irq != acpi_gbl_FADT.sci_interrupt)
 622                 return AE_BAD_PARAMETER;
 623
 624         free_irq(irq, acpi_irq);
 625         acpi_irq_handler = NULL;
 626
 627         return AE_OK;
 628 }
 629
 630 /*
 631  * Running in interpreter thread context, safe to sleep
 632  */
 633
 634 void acpi_os_sleep(u64 ms)
 635 {
 636         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 637 }
 638
 639 void acpi_os_stall(u32 us)
 640 {
 641         while (us) {
 642                 u32 delay = 1000;
 643
 644                 if (delay > us)
 645                         delay = us;
 646                 udelay(delay);
 647                 touch_nmi_watchdog();
 648                 us -= delay;
 649         }
 650 }
 651
 652 /*
 653  * Support ACPI 3.0 AML Timer operand
 654  * Returns 64-bit free-running, monotonically increasing timer
 655  * with 100ns granularity
 656  */
 657 u64 acpi_os_get_timer(void)
 658 {
 659         static u64 t;
 660
 661 #ifdef  CONFIG_HPET
 662         /* TBD: use HPET if available */
 663 #endif
 664
 665 #ifdef  CONFIG_X86_PM_TIMER
 666         /* TBD: default to PM timer if HPET was not available */
 667 #endif
 668         if (!t)
 669                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 670
 671         return ++t;
 672 }
 673
 674 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 675 {
 676         u32 dummy;
 677
 678         if (!value)
 679                 value = &dummy;
 680
 681         *value = 0;
 682         if (width <= 8) {
 683                 *(u8 *) value = inb(port);
 684         } else if (width <= 16) {
 685                 *(u16 *) value = inw(port);
 686         } else if (width <= 32) {
 687                 *(u32 *) value = inl(port);
 688         } else {
 689                 BUG();
 690         }
 691
 692         return AE_OK;
 693 }
 694
 695 EXPORT_SYMBOL(acpi_os_read_port);
 696
 697 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 698 {
 699         if (width <= 8) {
 700                 outb(value, port);
 701         } else if (width <= 16) {
 702                 outw(value, port);
 703         } else if (width <= 32) {
 704                 outl(value, port);
 705         } else {
 706                 BUG();
 707         }
 708
 709         return AE_OK;
 710 }
 711
 712 EXPORT_SYMBOL(acpi_os_write_port);
 713
 714 #ifdef readq
 715 static inline u64 read64(const volatile void __iomem *addr)
 716 {
 717         return readq(addr);
 718 }
 719 #else
 720 static inline u64 read64(const volatile void __iomem *addr)
 721 {
 722         u64 l, h;
 723         l = readl(addr);
 724         h = readl(addr+4);
 725         return l | (h << 32);
 726 }
 727 #endif
 728
 729 acpi_status
 730 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 731 {
 732         void __iomem *virt_addr;
 733         unsigned int size = width / 8;
 734         bool unmap = false;
 735         u64 dummy;
 736
 737         rcu_read_lock();
 738         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 739         if (!virt_addr) {
 740                 rcu_read_unlock();
 741                 virt_addr = acpi_os_ioremap(phys_addr, size);
 742                 if (!virt_addr)
 743                         return AE_BAD_ADDRESS;
 744                 unmap = true;
 745         }
 746
 747         if (!value)
 748                 value = &dummy;
 749
 750         switch (width) {
 751         case 8:
 752                 *(u8 *) value = readb(virt_addr);
 753                 break;
 754         case 16:
 755                 *(u16 *) value = readw(virt_addr);
 756                 break;
 757         case 32:
 758                 *(u32 *) value = readl(virt_addr);
 759                 break;
 760         case 64:
 761                 *(u64 *) value = read64(virt_addr);
 762                 break;
 763         default:
 764                 BUG();
 765         }
 766
 767         if (unmap)
 768                 iounmap(virt_addr);
 769         else
 770                 rcu_read_unlock();
 771
 772         return AE_OK;
 773 }
 774
 775 #ifdef writeq
 776 static inline void write64(u64 val, volatile void __iomem *addr)
 777 {
 778         writeq(val, addr);
 779 }
 780 #else
 781 static inline void write64(u64 val, volatile void __iomem *addr)
 782 {
 783         writel(val, addr);
 784         writel(val>>32, addr+4);
 785 }
 786 #endif
 787
 788 acpi_status
 789 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 790 {
 791         void __iomem *virt_addr;
 792         unsigned int size = width / 8;
 793         bool unmap = false;
 794
 795         rcu_read_lock();
 796         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 797         if (!virt_addr) {
 798                 rcu_read_unlock();
 799                 virt_addr = acpi_os_ioremap(phys_addr, size);
 800                 if (!virt_addr)
 801                         return AE_BAD_ADDRESS;
 802                 unmap = true;
 803         }
 804
 805         switch (width) {
 806         case 8:
 807                 writeb(value, virt_addr);
 808                 break;
 809         case 16:
 810                 writew(value, virt_addr);
 811                 break;
 812         case 32:
 813                 writel(value, virt_addr);
 814                 break;
 815         case 64:
 816                 write64(value, virt_addr);
 817                 break;
 818         default:
 819                 BUG();
 820         }
 821
 822         if (unmap)
 823                 iounmap(virt_addr);
 824         else
 825                 rcu_read_unlock();
 826
 827         return AE_OK;
 828 }
 829
 830 acpi_status
 831 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 832                                u64 *value, u32 width)
 833 {
 834         int result, size;
 835         u32 value32;
 836
 837         if (!value)
 838                 return AE_BAD_PARAMETER;
 839
 840         switch (width) {
 841         case 8:
 842                 size = 1;
 843                 break;
 844         case 16:
 845                 size = 2;
 846                 break;
 847         case 32:
 848                 size = 4;
 849                 break;
 850         default:
 851                 return AE_ERROR;
 852         }
 853
 854         result = raw_pci_read(pci_id->segment, pci_id->bus,
 855                                 PCI_DEVFN(pci_id->device, pci_id->function),
 856                                 reg, size, &value32);
 857         *value = value32;
 858
 859         return (result ? AE_ERROR : AE_OK);
 860 }
 861
 862 acpi_status
 863 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 864                                 u64 value, u32 width)
 865 {
 866         int result, size;
 867
 868         switch (width) {
 869         case 8:
 870                 size = 1;
 871                 break;
 872         case 16:
 873                 size = 2;
 874                 break;
 875         case 32:
 876                 size = 4;
 877                 break;
 878         default:
 879                 return AE_ERROR;
 880         }
 881
 882         result = raw_pci_write(pci_id->segment, pci_id->bus,
 883                                 PCI_DEVFN(pci_id->device, pci_id->function),
 884                                 reg, size, value);
 885
 886         return (result ? AE_ERROR : AE_OK);
 887 }
 888
 889 static void acpi_os_execute_deferred(struct work_struct *work)
 890 {
 891         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 892
 893         if (dpc->wait)
 894                 acpi_os_wait_events_complete(NULL);
 895
 896         dpc->function(dpc->context);
 897         kfree(dpc);
 898 }
 899
 900 /*******************************************************************************
 901  *
 902  * FUNCTION:    acpi_os_execute
 903  *
 904  * PARAMETERS:  Type               - Type of the callback
 905  *              Function           - Function to be executed
 906  *              Context            - Function parameters
 907  *
 908  * RETURN:      Status
 909  *
 910  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 911  *              immediately executes function on a separate thread.
 912  *
 913  ******************************************************************************/
 914
 915 static acpi_status __acpi_os_execute(acpi_execute_type type,
 916         acpi_osd_exec_callback function, void *context, int hp)
 917 {
 918         acpi_status status = AE_OK;
 919         struct acpi_os_dpc *dpc;
 920         struct workqueue_struct *queue;
 921         int ret;
 922         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 923                           "Scheduling function [%p(%p)] for deferred execution.\n",
 924                           function, context));
 925
 926         /*
 927          * Allocate/initialize DPC structure.  Note that this memory will be
 928          * freed by the callee.  The kernel handles the work_struct list  in a
 929          * way that allows us to also free its memory inside the callee.
 930          * Because we may want to schedule several tasks with different
 931          * parameters we can't use the approach some kernel code uses of
 932          * having a static work_struct.
 933          */
 934
 935         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 936         if (!dpc)
 937                 return AE_NO_MEMORY;
 938
 939         dpc->function = function;
 940         dpc->context = context;
 941
 942         /*
 943          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 944          * because the hotplug code may call driver .remove() functions,
 945          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 946          * to flush these workqueues.
 947          */
 948         queue = hp ? kacpi_hotplug_wq :
 949                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 950         dpc->wait = hp ? 1 : 0;
 951
 952         if (queue == kacpi_hotplug_wq)
 953                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 954         else if (queue == kacpi_notify_wq)
 955                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 956         else
 957                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 958
 959         /*
 960          * On some machines, a software-initiated SMI causes corruption unless
 961          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 962          * typically it's done in GPE-related methods that are run via
 963          * workqueues, so we can avoid the known corruption cases by always
 964          * queueing on CPU 0.
 965          */
 966         ret = queue_work_on(0, queue, &dpc->work);
 967
 968         if (!ret) {
 969                 printk(KERN_ERR PREFIX
 970                           "Call to queue_work() failed.\n");
 971                 status = AE_ERROR;
 972                 kfree(dpc);
 973         }
 974         return status;
 975 }
 976
 977 acpi_status acpi_os_execute(acpi_execute_type type,
 978                             acpi_osd_exec_callback function, void *context)
 979 {
 980         return __acpi_os_execute(type, function, context, 0);
 981 }
 982 EXPORT_SYMBOL(acpi_os_execute);
 983
 984 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 985         void *context)
 986 {
 987         return __acpi_os_execute(0, function, context, 1);
 988 }
 989
 990 void acpi_os_wait_events_complete(void *context)
 991 {
 992         flush_workqueue(kacpid_wq);
 993         flush_workqueue(kacpi_notify_wq);
 994 }
 995
 996 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 997
 998 acpi_status
 999 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1000 {
1001         struct semaphore *sem = NULL;
1002
1003         sem = acpi_os_allocate(sizeof(struct semaphore));
1004         if (!sem)
1005                 return AE_NO_MEMORY;
1006         memset(sem, 0, sizeof(struct semaphore));
1007
1008         sema_init(sem, initial_units);
1009
1010         *handle = (acpi_handle *) sem;
1011
1012         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1013                           *handle, initial_units));
1014
1015         return AE_OK;
1016 }
1017
1018 /*
1019  * TODO: A better way to delete semaphores?  Linux doesn't have a
1020  * 'delete_semaphore()' function -- may result in an invalid
1021  * pointer dereference for non-synchronized consumers.  Should
1022  * we at least check for blocked threads and signal/cancel them?
1023  */
1024
1025 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1026 {
1027         struct semaphore *sem = (struct semaphore *)handle;
1028
1029         if (!sem)
1030                 return AE_BAD_PARAMETER;
1031
1032         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1033
1034         BUG_ON(!list_empty(&sem->wait_list));
1035         kfree(sem);
1036         sem = NULL;
1037
1038         return AE_OK;
1039 }
1040
1041 /*
1042  * TODO: Support for units > 1?
1043  */
1044 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1045 {
1046         acpi_status status = AE_OK;
1047         struct semaphore *sem = (struct semaphore *)handle;
1048         long jiffies;
1049         int ret = 0;
1050
1051         if (!sem || (units < 1))
1052                 return AE_BAD_PARAMETER;
1053
1054         if (units > 1)
1055                 return AE_SUPPORT;
1056
1057         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1058                           handle, units, timeout));
1059
1060         if (timeout == ACPI_WAIT_FOREVER)
1061                 jiffies = MAX_SCHEDULE_TIMEOUT;
1062         else
1063                 jiffies = msecs_to_jiffies(timeout);
1064
1065         ret = down_timeout(sem, jiffies);
1066         if (ret)
1067                 status = AE_TIME;
1068
1069         if (ACPI_FAILURE(status)) {
1070                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1071                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1072                                   handle, units, timeout,
1073                                   acpi_format_exception(status)));
1074         } else {
1075                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1076                                   "Acquired semaphore[%p|%d|%d]", handle,
1077                                   units, timeout));
1078         }
1079
1080         return status;
1081 }
1082
1083 /*
1084  * TODO: Support for units > 1?
1085  */
1086 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1087 {
1088         struct semaphore *sem = (struct semaphore *)handle;
1089
1090         if (!sem || (units < 1))
1091                 return AE_BAD_PARAMETER;
1092
1093         if (units > 1)
1094                 return AE_SUPPORT;
1095
1096         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1097                           units));
1098
1099         up(sem);
1100
1101         return AE_OK;
1102 }
1103
1104 #ifdef ACPI_FUTURE_USAGE
1105 u32 acpi_os_get_line(char *buffer)
1106 {
1107
1108 #ifdef ENABLE_DEBUGGER
1109         if (acpi_in_debugger) {
1110                 u32 chars;
1111
1112                 kdb_read(buffer, sizeof(line_buf));
1113
1114                 /* remove the CR kdb includes */
1115                 chars = strlen(buffer) - 1;
1116                 buffer[chars] = '\0';
1117         }
1118 #endif
1119
1120         return 0;
1121 }
1122 #endif                          /*  ACPI_FUTURE_USAGE  */
1123
1124 acpi_status acpi_os_signal(u32 function, void *info)
1125 {
1126         switch (function) {
1127         case ACPI_SIGNAL_FATAL:
1128                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1129                 break;
1130         case ACPI_SIGNAL_BREAKPOINT:
1131                 /*
1132                  * AML Breakpoint
1133                  * ACPI spec. says to treat it as a NOP unless
1134                  * you are debugging.  So if/when we integrate
1135                  * AML debugger into the kernel debugger its
1136                  * hook will go here.  But until then it is
1137                  * not useful to print anything on breakpoints.
1138                  */
1139                 break;
1140         default:
1141                 break;
1142         }
1143
1144         return AE_OK;
1145 }
1146
1147 static int __init acpi_os_name_setup(char *str)
1148 {
1149         char *p = acpi_os_name;
1150         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1151
1152         if (!str || !*str)
1153                 return 0;
1154
1155         for (; count-- && str && *str; str++) {
1156                 if (isalnum(*str) || *str == ' ' || *str == ':')
1157                         *p++ = *str;
1158                 else if (*str == '\'' || *str == '"')
1159                         continue;
1160                 else
1161                         break;
1162         }
1163         *p = 0;
1164
1165         return 1;
1166
1167 }
1168
1169 __setup("acpi_os_name=", acpi_os_name_setup);
1170
1171 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1172 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1173
1174 struct osi_setup_entry {
1175         char string[OSI_STRING_LENGTH_MAX];
1176         bool enable;
1177 };
1178
1179 static struct osi_setup_entry __initdata
1180                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1181         {"Module Device", true},
1182         {"Processor Device", true},
1183         {"3.0 _SCP Extensions", true},
1184         {"Processor Aggregator Device", true},
1185 };
1186
1187 void __init acpi_osi_setup(char *str)
1188 {
1189         struct osi_setup_entry *osi;
1190         bool enable = true;
1191         int i;
1192
1193         if (!acpi_gbl_create_osi_method)
1194                 return;
1195
1196         if (str == NULL || *str == '\0') {
1197                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1198                 acpi_gbl_create_osi_method = FALSE;
1199                 return;
1200         }
1201
1202         if (*str == '!') {
1203                 str++;
1204                 enable = false;
1205         }
1206
1207         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1208                 osi = &osi_setup_entries[i];
1209                 if (!strcmp(osi->string, str)) {
1210                         osi->enable = enable;
1211                         break;
1212                 } else if (osi->string[0] == '\0') {
1213                         osi->enable = enable;
1214                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1215                         break;
1216                 }
1217         }
1218 }
1219
1220 static void __init set_osi_linux(unsigned int enable)
1221 {
1222         if (osi_linux.enable != enable)
1223                 osi_linux.enable = enable;
1224
1225         if (osi_linux.enable)
1226                 acpi_osi_setup("Linux");
1227         else
1228                 acpi_osi_setup("!Linux");
1229
1230         return;
1231 }
1232
1233 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1234 {
1235         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1236         osi_linux.dmi = 0;
1237         set_osi_linux(enable);
1238
1239         return;
1240 }
1241
1242 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1243 {
1244         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1245
1246         if (enable == -1)
1247                 return;
1248
1249         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1250         set_osi_linux(enable);
1251
1252         return;
1253 }
1254
1255 /*
1256  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1257  *
1258  * empty string disables _OSI
1259  * string starting with '!' disables that string
1260  * otherwise string is added to list, augmenting built-in strings
1261  */
1262 static void __init acpi_osi_setup_late(void)
1263 {
1264         struct osi_setup_entry *osi;
1265         char *str;
1266         int i;
1267         acpi_status status;
1268
1269         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1270                 osi = &osi_setup_entries[i];
1271                 str = osi->string;
1272
1273                 if (*str == '\0')
1274                         break;
1275                 if (osi->enable) {
1276                         status = acpi_install_interface(str);
1277
1278                         if (ACPI_SUCCESS(status))
1279                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1280                 } else {
1281                         status = acpi_remove_interface(str);
1282
1283                         if (ACPI_SUCCESS(status))
1284                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1285                 }
1286         }
1287 }
1288
1289 static int __init osi_setup(char *str)
1290 {
1291         if (str && !strcmp("Linux", str))
1292                 acpi_cmdline_osi_linux(1);
1293         else if (str && !strcmp("!Linux", str))
1294                 acpi_cmdline_osi_linux(0);
1295         else
1296                 acpi_osi_setup(str);
1297
1298         return 1;
1299 }
1300
1301 __setup("acpi_osi=", osi_setup);
1302
1303 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1304 static int __init acpi_serialize_setup(char *str)
1305 {
1306         printk(KERN_INFO PREFIX "serialize enabled\n");
1307
1308         acpi_gbl_all_methods_serialized = TRUE;
1309
1310         return 1;
1311 }
1312
1313 __setup("acpi_serialize", acpi_serialize_setup);
1314
1315 /* Check of resource interference between native drivers and ACPI
1316  * OperationRegions (SystemIO and System Memory only).
1317  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1318  * in arbitrary AML code and can interfere with legacy drivers.
1319  * acpi_enforce_resources= can be set to:
1320  *
1321  *   - strict (default) (2)
1322  *     -> further driver trying to access the resources will not load
1323  *   - lax              (1)
1324  *     -> further driver trying to access the resources will load, but you
1325  *     get a system message that something might go wrong...
1326  *
1327  *   - no               (0)
1328  *     -> ACPI Operation Region resources will not be registered
1329  *
1330  */
1331 #define ENFORCE_RESOURCES_STRICT 2
1332 #define ENFORCE_RESOURCES_LAX    1
1333 #define ENFORCE_RESOURCES_NO     0
1334
1335 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1336
1337 static int __init acpi_enforce_resources_setup(char *str)
1338 {
1339         if (str == NULL || *str == '\0')
1340                 return 0;
1341
1342         if (!strcmp("strict", str))
1343                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1344         else if (!strcmp("lax", str))
1345                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1346         else if (!strcmp("no", str))
1347                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1348
1349         return 1;
1350 }
1351
1352 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1353
1354 /* Check for resource conflicts between ACPI OperationRegions and native
1355  * drivers */
1356 int acpi_check_resource_conflict(const struct resource *res)
1357 {
1358         acpi_adr_space_type space_id;
1359         acpi_size length;
1360         u8 warn = 0;
1361         int clash = 0;
1362
1363         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1364                 return 0;
1365         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1366                 return 0;
1367
1368         if (res->flags & IORESOURCE_IO)
1369                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1370         else
1371                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1372
1373         length = res->end - res->start + 1;
1374         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1375                 warn = 1;
1376         clash = acpi_check_address_range(space_id, res->start, length, warn);
1377
1378         if (clash) {
1379                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1380                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1381                                 printk(KERN_NOTICE "ACPI: This conflict may"
1382                                        " cause random problems and system"
1383                                        " instability\n");
1384                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1385                                " for this device, you should use it instead of"
1386                                " the native driver\n");
1387                 }
1388                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1389                         return -EBUSY;
1390         }
1391         return 0;
1392 }
1393 EXPORT_SYMBOL(acpi_check_resource_conflict);
1394
1395 int acpi_check_region(resource_size_t start, resource_size_t n,
1396                       const char *name)
1397 {
1398         struct resource res = {
1399                 .start = start,
1400                 .end   = start + n - 1,
1401                 .name  = name,
1402                 .flags = IORESOURCE_IO,
1403         };
1404
1405         return acpi_check_resource_conflict(&res);
1406 }
1407 EXPORT_SYMBOL(acpi_check_region);
1408
1409 /*
1410  * Let drivers know whether the resource checks are effective
1411  */
1412 int acpi_resources_are_enforced(void)
1413 {
1414         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1415 }
1416 EXPORT_SYMBOL(acpi_resources_are_enforced);
1417
1418 /*
1419  * Deallocate the memory for a spinlock.
1420  */
1421 void acpi_os_delete_lock(acpi_spinlock handle)
1422 {
1423         ACPI_FREE(handle);
1424 }
1425
1426 /*
1427  * Acquire a spinlock.
1428  *
1429  * handle is a pointer to the spinlock_t.
1430  */
1431
1432 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1433 {
1434         acpi_cpu_flags flags;
1435         spin_lock_irqsave(lockp, flags);
1436         return flags;
1437 }
1438
1439 /*
1440  * Release a spinlock. See above.
1441  */
1442
1443 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1444 {
1445         spin_unlock_irqrestore(lockp, flags);
1446 }
1447
1448 #ifndef ACPI_USE_LOCAL_CACHE
1449
1450 /*******************************************************************************
1451  *
1452  * FUNCTION:    acpi_os_create_cache
1453  *
1454  * PARAMETERS:  name      - Ascii name for the cache
1455  *              size      - Size of each cached object
1456  *              depth     - Maximum depth of the cache (in objects) <ignored>
1457  *              cache     - Where the new cache object is returned
1458  *
1459  * RETURN:      status
1460  *
1461  * DESCRIPTION: Create a cache object
1462  *
1463  ******************************************************************************/
1464
1465 acpi_status
1466 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1467 {
1468         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1469         if (*cache == NULL)
1470                 return AE_ERROR;
1471         else
1472                 return AE_OK;
1473 }
1474
1475 /*******************************************************************************
1476  *
1477  * FUNCTION:    acpi_os_purge_cache
1478  *
1479  * PARAMETERS:  Cache           - Handle to cache object
1480  *
1481  * RETURN:      Status
1482  *
1483  * DESCRIPTION: Free all objects within the requested cache.
1484  *
1485  ******************************************************************************/
1486
1487 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1488 {
1489         kmem_cache_shrink(cache);
1490         return (AE_OK);
1491 }
1492
1493 /*******************************************************************************
1494  *
1495  * FUNCTION:    acpi_os_delete_cache
1496  *
1497  * PARAMETERS:  Cache           - Handle to cache object
1498  *
1499  * RETURN:      Status
1500  *
1501  * DESCRIPTION: Free all objects within the requested cache and delete the
1502  *              cache object.
1503  *
1504  ******************************************************************************/
1505
1506 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1507 {
1508         kmem_cache_destroy(cache);
1509         return (AE_OK);
1510 }
1511
1512 /*******************************************************************************
1513  *
1514  * FUNCTION:    acpi_os_release_object
1515  *
1516  * PARAMETERS:  Cache       - Handle to cache object
1517  *              Object      - The object to be released
1518  *
1519  * RETURN:      None
1520  *
1521  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1522  *              the object is deleted.
1523  *
1524  ******************************************************************************/
1525
1526 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1527 {
1528         kmem_cache_free(cache, object);
1529         return (AE_OK);
1530 }
1531 #endif
1532
1533 acpi_status __init acpi_os_initialize(void)
1534 {
1535         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1536         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1537         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1538         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1539
1540         return AE_OK;
1541 }
1542
1543 acpi_status __init acpi_os_initialize1(void)
1544 {
1545         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1546         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1547         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1548         BUG_ON(!kacpid_wq);
1549         BUG_ON(!kacpi_notify_wq);
1550         BUG_ON(!kacpi_hotplug_wq);
1551         acpi_install_interface_handler(acpi_osi_handler);
1552         acpi_osi_setup_late();
1553         return AE_OK;
1554 }
1555
1556 acpi_status acpi_os_terminate(void)
1557 {
1558         if (acpi_irq_handler) {
1559                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1560                                                  acpi_irq_handler);
1561         }
1562
1563         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1564         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1565         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1566         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1567
1568         destroy_workqueue(kacpid_wq);
1569         destroy_workqueue(kacpi_notify_wq);
1570         destroy_workqueue(kacpi_hotplug_wq);
1571
1572         return AE_OK;
1573 }
1574
1575 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1576                                   u32 pm1b_control)
1577 {
1578         int rc = 0;
1579         if (__acpi_os_prepare_sleep)
1580                 rc = __acpi_os_prepare_sleep(sleep_state,
1581                                              pm1a_control, pm1b_control);
1582         if (rc < 0)
1583                 return AE_ERROR;
1584         else if (rc > 0)
1585                 return AE_CTRL_SKIP;
1586
1587         return AE_OK;
1588 }
1589
1590 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1591                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1592 {
1593         __acpi_os_prepare_sleep = func;
1594 }