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_threaded_irq(irq, NULL, acpi_irq, IRQF_SHARED, "acpi",
 611                                  acpi_irq)) {
 612                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 613                 acpi_irq_handler = NULL;
 614                 return AE_NOT_ACQUIRED;
 615         }
 616
 617         return AE_OK;
 618 }
 619
 620 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 621 {
 622         if (irq != acpi_gbl_FADT.sci_interrupt)
 623                 return AE_BAD_PARAMETER;
 624
 625         free_irq(irq, acpi_irq);
 626         acpi_irq_handler = NULL;
 627
 628         return AE_OK;
 629 }
 630
 631 /*
 632  * Running in interpreter thread context, safe to sleep
 633  */
 634
 635 void acpi_os_sleep(u64 ms)
 636 {
 637         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 638 }
 639
 640 void acpi_os_stall(u32 us)
 641 {
 642         while (us) {
 643                 u32 delay = 1000;
 644
 645                 if (delay > us)
 646                         delay = us;
 647                 udelay(delay);
 648                 touch_nmi_watchdog();
 649                 us -= delay;
 650         }
 651 }
 652
 653 /*
 654  * Support ACPI 3.0 AML Timer operand
 655  * Returns 64-bit free-running, monotonically increasing timer
 656  * with 100ns granularity
 657  */
 658 u64 acpi_os_get_timer(void)
 659 {
 660         static u64 t;
 661
 662 #ifdef  CONFIG_HPET
 663         /* TBD: use HPET if available */
 664 #endif
 665
 666 #ifdef  CONFIG_X86_PM_TIMER
 667         /* TBD: default to PM timer if HPET was not available */
 668 #endif
 669         if (!t)
 670                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 671
 672         return ++t;
 673 }
 674
 675 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 676 {
 677         u32 dummy;
 678
 679         if (!value)
 680                 value = &dummy;
 681
 682         *value = 0;
 683         if (width <= 8) {
 684                 *(u8 *) value = inb(port);
 685         } else if (width <= 16) {
 686                 *(u16 *) value = inw(port);
 687         } else if (width <= 32) {
 688                 *(u32 *) value = inl(port);
 689         } else {
 690                 BUG();
 691         }
 692
 693         return AE_OK;
 694 }
 695
 696 EXPORT_SYMBOL(acpi_os_read_port);
 697
 698 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 699 {
 700         if (width <= 8) {
 701                 outb(value, port);
 702         } else if (width <= 16) {
 703                 outw(value, port);
 704         } else if (width <= 32) {
 705                 outl(value, port);
 706         } else {
 707                 BUG();
 708         }
 709
 710         return AE_OK;
 711 }
 712
 713 EXPORT_SYMBOL(acpi_os_write_port);
 714
 715 #ifdef readq
 716 static inline u64 read64(const volatile void __iomem *addr)
 717 {
 718         return readq(addr);
 719 }
 720 #else
 721 static inline u64 read64(const volatile void __iomem *addr)
 722 {
 723         u64 l, h;
 724         l = readl(addr);
 725         h = readl(addr+4);
 726         return l | (h << 32);
 727 }
 728 #endif
 729
 730 acpi_status
 731 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 732 {
 733         void __iomem *virt_addr;
 734         unsigned int size = width / 8;
 735         bool unmap = false;
 736         u64 dummy;
 737
 738         rcu_read_lock();
 739         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 740         if (!virt_addr) {
 741                 rcu_read_unlock();
 742                 virt_addr = acpi_os_ioremap(phys_addr, size);
 743                 if (!virt_addr)
 744                         return AE_BAD_ADDRESS;
 745                 unmap = true;
 746         }
 747
 748         if (!value)
 749                 value = &dummy;
 750
 751         switch (width) {
 752         case 8:
 753                 *(u8 *) value = readb(virt_addr);
 754                 break;
 755         case 16:
 756                 *(u16 *) value = readw(virt_addr);
 757                 break;
 758         case 32:
 759                 *(u32 *) value = readl(virt_addr);
 760                 break;
 761         case 64:
 762                 *(u64 *) value = read64(virt_addr);
 763                 break;
 764         default:
 765                 BUG();
 766         }
 767
 768         if (unmap)
 769                 iounmap(virt_addr);
 770         else
 771                 rcu_read_unlock();
 772
 773         return AE_OK;
 774 }
 775
 776 #ifdef writeq
 777 static inline void write64(u64 val, volatile void __iomem *addr)
 778 {
 779         writeq(val, addr);
 780 }
 781 #else
 782 static inline void write64(u64 val, volatile void __iomem *addr)
 783 {
 784         writel(val, addr);
 785         writel(val>>32, addr+4);
 786 }
 787 #endif
 788
 789 acpi_status
 790 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 791 {
 792         void __iomem *virt_addr;
 793         unsigned int size = width / 8;
 794         bool unmap = false;
 795
 796         rcu_read_lock();
 797         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 798         if (!virt_addr) {
 799                 rcu_read_unlock();
 800                 virt_addr = acpi_os_ioremap(phys_addr, size);
 801                 if (!virt_addr)
 802                         return AE_BAD_ADDRESS;
 803                 unmap = true;
 804         }
 805
 806         switch (width) {
 807         case 8:
 808                 writeb(value, virt_addr);
 809                 break;
 810         case 16:
 811                 writew(value, virt_addr);
 812                 break;
 813         case 32:
 814                 writel(value, virt_addr);
 815                 break;
 816         case 64:
 817                 write64(value, virt_addr);
 818                 break;
 819         default:
 820                 BUG();
 821         }
 822
 823         if (unmap)
 824                 iounmap(virt_addr);
 825         else
 826                 rcu_read_unlock();
 827
 828         return AE_OK;
 829 }
 830
 831 acpi_status
 832 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 833                                u64 *value, u32 width)
 834 {
 835         int result, size;
 836         u32 value32;
 837
 838         if (!value)
 839                 return AE_BAD_PARAMETER;
 840
 841         switch (width) {
 842         case 8:
 843                 size = 1;
 844                 break;
 845         case 16:
 846                 size = 2;
 847                 break;
 848         case 32:
 849                 size = 4;
 850                 break;
 851         default:
 852                 return AE_ERROR;
 853         }
 854
 855         result = raw_pci_read(pci_id->segment, pci_id->bus,
 856                                 PCI_DEVFN(pci_id->device, pci_id->function),
 857                                 reg, size, &value32);
 858         *value = value32;
 859
 860         return (result ? AE_ERROR : AE_OK);
 861 }
 862
 863 acpi_status
 864 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 865                                 u64 value, u32 width)
 866 {
 867         int result, size;
 868
 869         switch (width) {
 870         case 8:
 871                 size = 1;
 872                 break;
 873         case 16:
 874                 size = 2;
 875                 break;
 876         case 32:
 877                 size = 4;
 878                 break;
 879         default:
 880                 return AE_ERROR;
 881         }
 882
 883         result = raw_pci_write(pci_id->segment, pci_id->bus,
 884                                 PCI_DEVFN(pci_id->device, pci_id->function),
 885                                 reg, size, value);
 886
 887         return (result ? AE_ERROR : AE_OK);
 888 }
 889
 890 static void acpi_os_execute_deferred(struct work_struct *work)
 891 {
 892         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 893
 894         if (dpc->wait)
 895                 acpi_os_wait_events_complete(NULL);
 896
 897         dpc->function(dpc->context);
 898         kfree(dpc);
 899 }
 900
 901 /*******************************************************************************
 902  *
 903  * FUNCTION:    acpi_os_execute
 904  *
 905  * PARAMETERS:  Type               - Type of the callback
 906  *              Function           - Function to be executed
 907  *              Context            - Function parameters
 908  *
 909  * RETURN:      Status
 910  *
 911  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 912  *              immediately executes function on a separate thread.
 913  *
 914  ******************************************************************************/
 915
 916 static acpi_status __acpi_os_execute(acpi_execute_type type,
 917         acpi_osd_exec_callback function, void *context, int hp)
 918 {
 919         acpi_status status = AE_OK;
 920         struct acpi_os_dpc *dpc;
 921         struct workqueue_struct *queue;
 922         int ret;
 923         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 924                           "Scheduling function [%p(%p)] for deferred execution.\n",
 925                           function, context));
 926
 927         /*
 928          * Allocate/initialize DPC structure.  Note that this memory will be
 929          * freed by the callee.  The kernel handles the work_struct list  in a
 930          * way that allows us to also free its memory inside the callee.
 931          * Because we may want to schedule several tasks with different
 932          * parameters we can't use the approach some kernel code uses of
 933          * having a static work_struct.
 934          */
 935
 936         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 937         if (!dpc)
 938                 return AE_NO_MEMORY;
 939
 940         dpc->function = function;
 941         dpc->context = context;
 942
 943         /*
 944          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 945          * because the hotplug code may call driver .remove() functions,
 946          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 947          * to flush these workqueues.
 948          */
 949         queue = hp ? kacpi_hotplug_wq :
 950                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 951         dpc->wait = hp ? 1 : 0;
 952
 953         if (queue == kacpi_hotplug_wq)
 954                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 955         else if (queue == kacpi_notify_wq)
 956                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 957         else
 958                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 959
 960         /*
 961          * On some machines, a software-initiated SMI causes corruption unless
 962          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 963          * typically it's done in GPE-related methods that are run via
 964          * workqueues, so we can avoid the known corruption cases by always
 965          * queueing on CPU 0.
 966          */
 967         ret = queue_work_on(0, queue, &dpc->work);
 968
 969         if (!ret) {
 970                 printk(KERN_ERR PREFIX
 971                           "Call to queue_work() failed.\n");
 972                 status = AE_ERROR;
 973                 kfree(dpc);
 974         }
 975         return status;
 976 }
 977
 978 acpi_status acpi_os_execute(acpi_execute_type type,
 979                             acpi_osd_exec_callback function, void *context)
 980 {
 981         return __acpi_os_execute(type, function, context, 0);
 982 }
 983 EXPORT_SYMBOL(acpi_os_execute);
 984
 985 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 986         void *context)
 987 {
 988         return __acpi_os_execute(0, function, context, 1);
 989 }
 990
 991 void acpi_os_wait_events_complete(void *context)
 992 {
 993         flush_workqueue(kacpid_wq);
 994         flush_workqueue(kacpi_notify_wq);
 995 }
 996
 997 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 998
 999 acpi_status
1000 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1001 {
1002         struct semaphore *sem = NULL;
1003
1004         sem = acpi_os_allocate(sizeof(struct semaphore));
1005         if (!sem)
1006                 return AE_NO_MEMORY;
1007         memset(sem, 0, sizeof(struct semaphore));
1008
1009         sema_init(sem, initial_units);
1010
1011         *handle = (acpi_handle *) sem;
1012
1013         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1014                           *handle, initial_units));
1015
1016         return AE_OK;
1017 }
1018
1019 /*
1020  * TODO: A better way to delete semaphores?  Linux doesn't have a
1021  * 'delete_semaphore()' function -- may result in an invalid
1022  * pointer dereference for non-synchronized consumers.  Should
1023  * we at least check for blocked threads and signal/cancel them?
1024  */
1025
1026 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1027 {
1028         struct semaphore *sem = (struct semaphore *)handle;
1029
1030         if (!sem)
1031                 return AE_BAD_PARAMETER;
1032
1033         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1034
1035         BUG_ON(!list_empty(&sem->wait_list));
1036         kfree(sem);
1037         sem = NULL;
1038
1039         return AE_OK;
1040 }
1041
1042 /*
1043  * TODO: Support for units > 1?
1044  */
1045 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1046 {
1047         acpi_status status = AE_OK;
1048         struct semaphore *sem = (struct semaphore *)handle;
1049         long jiffies;
1050         int ret = 0;
1051
1052         if (!sem || (units < 1))
1053                 return AE_BAD_PARAMETER;
1054
1055         if (units > 1)
1056                 return AE_SUPPORT;
1057
1058         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1059                           handle, units, timeout));
1060
1061         if (timeout == ACPI_WAIT_FOREVER)
1062                 jiffies = MAX_SCHEDULE_TIMEOUT;
1063         else
1064                 jiffies = msecs_to_jiffies(timeout);
1065
1066         ret = down_timeout(sem, jiffies);
1067         if (ret)
1068                 status = AE_TIME;
1069
1070         if (ACPI_FAILURE(status)) {
1071                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1072                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1073                                   handle, units, timeout,
1074                                   acpi_format_exception(status)));
1075         } else {
1076                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1077                                   "Acquired semaphore[%p|%d|%d]", handle,
1078                                   units, timeout));
1079         }
1080
1081         return status;
1082 }
1083
1084 /*
1085  * TODO: Support for units > 1?
1086  */
1087 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1088 {
1089         struct semaphore *sem = (struct semaphore *)handle;
1090
1091         if (!sem || (units < 1))
1092                 return AE_BAD_PARAMETER;
1093
1094         if (units > 1)
1095                 return AE_SUPPORT;
1096
1097         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1098                           units));
1099
1100         up(sem);
1101
1102         return AE_OK;
1103 }
1104
1105 #ifdef ACPI_FUTURE_USAGE
1106 u32 acpi_os_get_line(char *buffer)
1107 {
1108
1109 #ifdef ENABLE_DEBUGGER
1110         if (acpi_in_debugger) {
1111                 u32 chars;
1112
1113                 kdb_read(buffer, sizeof(line_buf));
1114
1115                 /* remove the CR kdb includes */
1116                 chars = strlen(buffer) - 1;
1117                 buffer[chars] = '\0';
1118         }
1119 #endif
1120
1121         return 0;
1122 }
1123 #endif                          /*  ACPI_FUTURE_USAGE  */
1124
1125 acpi_status acpi_os_signal(u32 function, void *info)
1126 {
1127         switch (function) {
1128         case ACPI_SIGNAL_FATAL:
1129                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1130                 break;
1131         case ACPI_SIGNAL_BREAKPOINT:
1132                 /*
1133                  * AML Breakpoint
1134                  * ACPI spec. says to treat it as a NOP unless
1135                  * you are debugging.  So if/when we integrate
1136                  * AML debugger into the kernel debugger its
1137                  * hook will go here.  But until then it is
1138                  * not useful to print anything on breakpoints.
1139                  */
1140                 break;
1141         default:
1142                 break;
1143         }
1144
1145         return AE_OK;
1146 }
1147
1148 static int __init acpi_os_name_setup(char *str)
1149 {
1150         char *p = acpi_os_name;
1151         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1152
1153         if (!str || !*str)
1154                 return 0;
1155
1156         for (; count-- && str && *str; str++) {
1157                 if (isalnum(*str) || *str == ' ' || *str == ':')
1158                         *p++ = *str;
1159                 else if (*str == '\'' || *str == '"')
1160                         continue;
1161                 else
1162                         break;
1163         }
1164         *p = 0;
1165
1166         return 1;
1167
1168 }
1169
1170 __setup("acpi_os_name=", acpi_os_name_setup);
1171
1172 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1173 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1174
1175 struct osi_setup_entry {
1176         char string[OSI_STRING_LENGTH_MAX];
1177         bool enable;
1178 };
1179
1180 static struct osi_setup_entry __initdata
1181                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1182         {"Module Device", true},
1183         {"Processor Device", true},
1184         {"3.0 _SCP Extensions", true},
1185         {"Processor Aggregator Device", true},
1186 };
1187
1188 void __init acpi_osi_setup(char *str)
1189 {
1190         struct osi_setup_entry *osi;
1191         bool enable = true;
1192         int i;
1193
1194         if (!acpi_gbl_create_osi_method)
1195                 return;
1196
1197         if (str == NULL || *str == '\0') {
1198                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1199                 acpi_gbl_create_osi_method = FALSE;
1200                 return;
1201         }
1202
1203         if (*str == '!') {
1204                 str++;
1205                 enable = false;
1206         }
1207
1208         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1209                 osi = &osi_setup_entries[i];
1210                 if (!strcmp(osi->string, str)) {
1211                         osi->enable = enable;
1212                         break;
1213                 } else if (osi->string[0] == '\0') {
1214                         osi->enable = enable;
1215                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1216                         break;
1217                 }
1218         }
1219 }
1220
1221 static void __init set_osi_linux(unsigned int enable)
1222 {
1223         if (osi_linux.enable != enable)
1224                 osi_linux.enable = enable;
1225
1226         if (osi_linux.enable)
1227                 acpi_osi_setup("Linux");
1228         else
1229                 acpi_osi_setup("!Linux");
1230
1231         return;
1232 }
1233
1234 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1235 {
1236         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1237         osi_linux.dmi = 0;
1238         set_osi_linux(enable);
1239
1240         return;
1241 }
1242
1243 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1244 {
1245         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1246
1247         if (enable == -1)
1248                 return;
1249
1250         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1251         set_osi_linux(enable);
1252
1253         return;
1254 }
1255
1256 /*
1257  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1258  *
1259  * empty string disables _OSI
1260  * string starting with '!' disables that string
1261  * otherwise string is added to list, augmenting built-in strings
1262  */
1263 static void __init acpi_osi_setup_late(void)
1264 {
1265         struct osi_setup_entry *osi;
1266         char *str;
1267         int i;
1268         acpi_status status;
1269
1270         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1271                 osi = &osi_setup_entries[i];
1272                 str = osi->string;
1273
1274                 if (*str == '\0')
1275                         break;
1276                 if (osi->enable) {
1277                         status = acpi_install_interface(str);
1278
1279                         if (ACPI_SUCCESS(status))
1280                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1281                 } else {
1282                         status = acpi_remove_interface(str);
1283
1284                         if (ACPI_SUCCESS(status))
1285                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1286                 }
1287         }
1288 }
1289
1290 static int __init osi_setup(char *str)
1291 {
1292         if (str && !strcmp("Linux", str))
1293                 acpi_cmdline_osi_linux(1);
1294         else if (str && !strcmp("!Linux", str))
1295                 acpi_cmdline_osi_linux(0);
1296         else
1297                 acpi_osi_setup(str);
1298
1299         return 1;
1300 }
1301
1302 __setup("acpi_osi=", osi_setup);
1303
1304 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1305 static int __init acpi_serialize_setup(char *str)
1306 {
1307         printk(KERN_INFO PREFIX "serialize enabled\n");
1308
1309         acpi_gbl_all_methods_serialized = TRUE;
1310
1311         return 1;
1312 }
1313
1314 __setup("acpi_serialize", acpi_serialize_setup);
1315
1316 /* Check of resource interference between native drivers and ACPI
1317  * OperationRegions (SystemIO and System Memory only).
1318  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1319  * in arbitrary AML code and can interfere with legacy drivers.
1320  * acpi_enforce_resources= can be set to:
1321  *
1322  *   - strict (default) (2)
1323  *     -> further driver trying to access the resources will not load
1324  *   - lax              (1)
1325  *     -> further driver trying to access the resources will load, but you
1326  *     get a system message that something might go wrong...
1327  *
1328  *   - no               (0)
1329  *     -> ACPI Operation Region resources will not be registered
1330  *
1331  */
1332 #define ENFORCE_RESOURCES_STRICT 2
1333 #define ENFORCE_RESOURCES_LAX    1
1334 #define ENFORCE_RESOURCES_NO     0
1335
1336 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1337
1338 static int __init acpi_enforce_resources_setup(char *str)
1339 {
1340         if (str == NULL || *str == '\0')
1341                 return 0;
1342
1343         if (!strcmp("strict", str))
1344                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1345         else if (!strcmp("lax", str))
1346                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1347         else if (!strcmp("no", str))
1348                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1349
1350         return 1;
1351 }
1352
1353 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1354
1355 /* Check for resource conflicts between ACPI OperationRegions and native
1356  * drivers */
1357 int acpi_check_resource_conflict(const struct resource *res)
1358 {
1359         acpi_adr_space_type space_id;
1360         acpi_size length;
1361         u8 warn = 0;
1362         int clash = 0;
1363
1364         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1365                 return 0;
1366         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1367                 return 0;
1368
1369         if (res->flags & IORESOURCE_IO)
1370                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1371         else
1372                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1373
1374         length = res->end - res->start + 1;
1375         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1376                 warn = 1;
1377         clash = acpi_check_address_range(space_id, res->start, length, warn);
1378
1379         if (clash) {
1380                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1381                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1382                                 printk(KERN_NOTICE "ACPI: This conflict may"
1383                                        " cause random problems and system"
1384                                        " instability\n");
1385                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1386                                " for this device, you should use it instead of"
1387                                " the native driver\n");
1388                 }
1389                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1390                         return -EBUSY;
1391         }
1392         return 0;
1393 }
1394 EXPORT_SYMBOL(acpi_check_resource_conflict);
1395
1396 int acpi_check_region(resource_size_t start, resource_size_t n,
1397                       const char *name)
1398 {
1399         struct resource res = {
1400                 .start = start,
1401                 .end   = start + n - 1,
1402                 .name  = name,
1403                 .flags = IORESOURCE_IO,
1404         };
1405
1406         return acpi_check_resource_conflict(&res);
1407 }
1408 EXPORT_SYMBOL(acpi_check_region);
1409
1410 /*
1411  * Let drivers know whether the resource checks are effective
1412  */
1413 int acpi_resources_are_enforced(void)
1414 {
1415         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1416 }
1417 EXPORT_SYMBOL(acpi_resources_are_enforced);
1418
1419 /*
1420  * Deallocate the memory for a spinlock.
1421  */
1422 void acpi_os_delete_lock(acpi_spinlock handle)
1423 {
1424         ACPI_FREE(handle);
1425 }
1426
1427 /*
1428  * Acquire a spinlock.
1429  *
1430  * handle is a pointer to the spinlock_t.
1431  */
1432
1433 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1434 {
1435         acpi_cpu_flags flags;
1436         spin_lock_irqsave(lockp, flags);
1437         return flags;
1438 }
1439
1440 /*
1441  * Release a spinlock. See above.
1442  */
1443
1444 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1445 {
1446         spin_unlock_irqrestore(lockp, flags);
1447 }
1448
1449 #ifndef ACPI_USE_LOCAL_CACHE
1450
1451 /*******************************************************************************
1452  *
1453  * FUNCTION:    acpi_os_create_cache
1454  *
1455  * PARAMETERS:  name      - Ascii name for the cache
1456  *              size      - Size of each cached object
1457  *              depth     - Maximum depth of the cache (in objects) <ignored>
1458  *              cache     - Where the new cache object is returned
1459  *
1460  * RETURN:      status
1461  *
1462  * DESCRIPTION: Create a cache object
1463  *
1464  ******************************************************************************/
1465
1466 acpi_status
1467 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1468 {
1469         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1470         if (*cache == NULL)
1471                 return AE_ERROR;
1472         else
1473                 return AE_OK;
1474 }
1475
1476 /*******************************************************************************
1477  *
1478  * FUNCTION:    acpi_os_purge_cache
1479  *
1480  * PARAMETERS:  Cache           - Handle to cache object
1481  *
1482  * RETURN:      Status
1483  *
1484  * DESCRIPTION: Free all objects within the requested cache.
1485  *
1486  ******************************************************************************/
1487
1488 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1489 {
1490         kmem_cache_shrink(cache);
1491         return (AE_OK);
1492 }
1493
1494 /*******************************************************************************
1495  *
1496  * FUNCTION:    acpi_os_delete_cache
1497  *
1498  * PARAMETERS:  Cache           - Handle to cache object
1499  *
1500  * RETURN:      Status
1501  *
1502  * DESCRIPTION: Free all objects within the requested cache and delete the
1503  *              cache object.
1504  *
1505  ******************************************************************************/
1506
1507 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1508 {
1509         kmem_cache_destroy(cache);
1510         return (AE_OK);
1511 }
1512
1513 /*******************************************************************************
1514  *
1515  * FUNCTION:    acpi_os_release_object
1516  *
1517  * PARAMETERS:  Cache       - Handle to cache object
1518  *              Object      - The object to be released
1519  *
1520  * RETURN:      None
1521  *
1522  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1523  *              the object is deleted.
1524  *
1525  ******************************************************************************/
1526
1527 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1528 {
1529         kmem_cache_free(cache, object);
1530         return (AE_OK);
1531 }
1532 #endif
1533
1534 acpi_status __init acpi_os_initialize(void)
1535 {
1536         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1537         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1538         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1539         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1540
1541         return AE_OK;
1542 }
1543
1544 acpi_status __init acpi_os_initialize1(void)
1545 {
1546         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1547         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1548         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1549         BUG_ON(!kacpid_wq);
1550         BUG_ON(!kacpi_notify_wq);
1551         BUG_ON(!kacpi_hotplug_wq);
1552         acpi_install_interface_handler(acpi_osi_handler);
1553         acpi_osi_setup_late();
1554         return AE_OK;
1555 }
1556
1557 acpi_status acpi_os_terminate(void)
1558 {
1559         if (acpi_irq_handler) {
1560                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1561                                                  acpi_irq_handler);
1562         }
1563
1564         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1565         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1566         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1567         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1568
1569         destroy_workqueue(kacpid_wq);
1570         destroy_workqueue(kacpi_notify_wq);
1571         destroy_workqueue(kacpi_hotplug_wq);
1572
1573         return AE_OK;
1574 }
1575
1576 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1577                                   u32 pm1b_control)
1578 {
1579         int rc = 0;
1580         if (__acpi_os_prepare_sleep)
1581                 rc = __acpi_os_prepare_sleep(sleep_state,
1582                                              pm1a_control, pm1b_control);
1583         if (rc < 0)
1584                 return AE_ERROR;
1585         else if (rc > 0)
1586                 return AE_CTRL_SKIP;
1587
1588         return AE_OK;
1589 }
1590
1591 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1592                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1593 {
1594         __acpi_os_prepare_sleep = func;
1595 }