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();
 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 = kzalloc(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          * To prevent lockdep from complaining unnecessarily, make sure that
 949          * there is a different static lockdep key for each workqueue by using
 950          * INIT_WORK() for each of them separately.
 951          */
 952         if (hp) {
 953                 queue = kacpi_hotplug_wq;
 954                 dpc->wait = 1;
 955                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 956         } else if (type == OSL_NOTIFY_HANDLER) {
 957                 queue = kacpi_notify_wq;
 958                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 959         } else {
 960                 queue = kacpid_wq;
 961                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 962         }
 963
 964         /*
 965          * On some machines, a software-initiated SMI causes corruption unless
 966          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 967          * typically it's done in GPE-related methods that are run via
 968          * workqueues, so we can avoid the known corruption cases by always
 969          * queueing on CPU 0.
 970          */
 971         ret = queue_work_on(0, queue, &dpc->work);
 972
 973         if (!ret) {
 974                 printk(KERN_ERR PREFIX
 975                           "Call to queue_work() failed.\n");
 976                 status = AE_ERROR;
 977                 kfree(dpc);
 978         }
 979         return status;
 980 }
 981
 982 acpi_status acpi_os_execute(acpi_execute_type type,
 983                             acpi_osd_exec_callback function, void *context)
 984 {
 985         return __acpi_os_execute(type, function, context, 0);
 986 }
 987 EXPORT_SYMBOL(acpi_os_execute);
 988
 989 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 990         void *context)
 991 {
 992         return __acpi_os_execute(0, function, context, 1);
 993 }
 994 EXPORT_SYMBOL(acpi_os_hotplug_execute);
 995
 996 void acpi_os_wait_events_complete(void)
 997 {
 998         flush_workqueue(kacpid_wq);
 999         flush_workqueue(kacpi_notify_wq);
1000 }
1001
1002 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1003
1004 acpi_status
1005 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1006 {
1007         struct semaphore *sem = NULL;
1008
1009         sem = acpi_os_allocate(sizeof(struct semaphore));
1010         if (!sem)
1011                 return AE_NO_MEMORY;
1012         memset(sem, 0, sizeof(struct semaphore));
1013
1014         sema_init(sem, initial_units);
1015
1016         *handle = (acpi_handle *) sem;
1017
1018         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1019                           *handle, initial_units));
1020
1021         return AE_OK;
1022 }
1023
1024 /*
1025  * TODO: A better way to delete semaphores?  Linux doesn't have a
1026  * 'delete_semaphore()' function -- may result in an invalid
1027  * pointer dereference for non-synchronized consumers.  Should
1028  * we at least check for blocked threads and signal/cancel them?
1029  */
1030
1031 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1032 {
1033         struct semaphore *sem = (struct semaphore *)handle;
1034
1035         if (!sem)
1036                 return AE_BAD_PARAMETER;
1037
1038         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1039
1040         BUG_ON(!list_empty(&sem->wait_list));
1041         kfree(sem);
1042         sem = NULL;
1043
1044         return AE_OK;
1045 }
1046
1047 /*
1048  * TODO: Support for units > 1?
1049  */
1050 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1051 {
1052         acpi_status status = AE_OK;
1053         struct semaphore *sem = (struct semaphore *)handle;
1054         long jiffies;
1055         int ret = 0;
1056
1057         if (!sem || (units < 1))
1058                 return AE_BAD_PARAMETER;
1059
1060         if (units > 1)
1061                 return AE_SUPPORT;
1062
1063         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1064                           handle, units, timeout));
1065
1066         if (timeout == ACPI_WAIT_FOREVER)
1067                 jiffies = MAX_SCHEDULE_TIMEOUT;
1068         else
1069                 jiffies = msecs_to_jiffies(timeout);
1070
1071         ret = down_timeout(sem, jiffies);
1072         if (ret)
1073                 status = AE_TIME;
1074
1075         if (ACPI_FAILURE(status)) {
1076                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1077                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1078                                   handle, units, timeout,
1079                                   acpi_format_exception(status)));
1080         } else {
1081                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1082                                   "Acquired semaphore[%p|%d|%d]", handle,
1083                                   units, timeout));
1084         }
1085
1086         return status;
1087 }
1088
1089 /*
1090  * TODO: Support for units > 1?
1091  */
1092 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1093 {
1094         struct semaphore *sem = (struct semaphore *)handle;
1095
1096         if (!sem || (units < 1))
1097                 return AE_BAD_PARAMETER;
1098
1099         if (units > 1)
1100                 return AE_SUPPORT;
1101
1102         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1103                           units));
1104
1105         up(sem);
1106
1107         return AE_OK;
1108 }
1109
1110 #ifdef ACPI_FUTURE_USAGE
1111 u32 acpi_os_get_line(char *buffer)
1112 {
1113
1114 #ifdef ENABLE_DEBUGGER
1115         if (acpi_in_debugger) {
1116                 u32 chars;
1117
1118                 kdb_read(buffer, sizeof(line_buf));
1119
1120                 /* remove the CR kdb includes */
1121                 chars = strlen(buffer) - 1;
1122                 buffer[chars] = '\0';
1123         }
1124 #endif
1125
1126         return 0;
1127 }
1128 #endif                          /*  ACPI_FUTURE_USAGE  */
1129
1130 acpi_status acpi_os_signal(u32 function, void *info)
1131 {
1132         switch (function) {
1133         case ACPI_SIGNAL_FATAL:
1134                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1135                 break;
1136         case ACPI_SIGNAL_BREAKPOINT:
1137                 /*
1138                  * AML Breakpoint
1139                  * ACPI spec. says to treat it as a NOP unless
1140                  * you are debugging.  So if/when we integrate
1141                  * AML debugger into the kernel debugger its
1142                  * hook will go here.  But until then it is
1143                  * not useful to print anything on breakpoints.
1144                  */
1145                 break;
1146         default:
1147                 break;
1148         }
1149
1150         return AE_OK;
1151 }
1152
1153 static int __init acpi_os_name_setup(char *str)
1154 {
1155         char *p = acpi_os_name;
1156         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1157
1158         if (!str || !*str)
1159                 return 0;
1160
1161         for (; count-- && str && *str; str++) {
1162                 if (isalnum(*str) || *str == ' ' || *str == ':')
1163                         *p++ = *str;
1164                 else if (*str == '\'' || *str == '"')
1165                         continue;
1166                 else
1167                         break;
1168         }
1169         *p = 0;
1170
1171         return 1;
1172
1173 }
1174
1175 __setup("acpi_os_name=", acpi_os_name_setup);
1176
1177 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1178 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1179
1180 struct osi_setup_entry {
1181         char string[OSI_STRING_LENGTH_MAX];
1182         bool enable;
1183 };
1184
1185 static struct osi_setup_entry __initdata
1186                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1187         {"Module Device", true},
1188         {"Processor Device", true},
1189         {"3.0 _SCP Extensions", true},
1190         {"Processor Aggregator Device", true},
1191 };
1192
1193 void __init acpi_osi_setup(char *str)
1194 {
1195         struct osi_setup_entry *osi;
1196         bool enable = true;
1197         int i;
1198
1199         if (!acpi_gbl_create_osi_method)
1200                 return;
1201
1202         if (str == NULL || *str == '\0') {
1203                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1204                 acpi_gbl_create_osi_method = FALSE;
1205                 return;
1206         }
1207
1208         if (*str == '!') {
1209                 str++;
1210                 enable = false;
1211         }
1212
1213         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1214                 osi = &osi_setup_entries[i];
1215                 if (!strcmp(osi->string, str)) {
1216                         osi->enable = enable;
1217                         break;
1218                 } else if (osi->string[0] == '\0') {
1219                         osi->enable = enable;
1220                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1221                         break;
1222                 }
1223         }
1224 }
1225
1226 static void __init set_osi_linux(unsigned int enable)
1227 {
1228         if (osi_linux.enable != enable)
1229                 osi_linux.enable = enable;
1230
1231         if (osi_linux.enable)
1232                 acpi_osi_setup("Linux");
1233         else
1234                 acpi_osi_setup("!Linux");
1235
1236         return;
1237 }
1238
1239 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1240 {
1241         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1242         osi_linux.dmi = 0;
1243         set_osi_linux(enable);
1244
1245         return;
1246 }
1247
1248 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1249 {
1250         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1251
1252         if (enable == -1)
1253                 return;
1254
1255         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1256         set_osi_linux(enable);
1257
1258         return;
1259 }
1260
1261 /*
1262  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1263  *
1264  * empty string disables _OSI
1265  * string starting with '!' disables that string
1266  * otherwise string is added to list, augmenting built-in strings
1267  */
1268 static void __init acpi_osi_setup_late(void)
1269 {
1270         struct osi_setup_entry *osi;
1271         char *str;
1272         int i;
1273         acpi_status status;
1274
1275         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1276                 osi = &osi_setup_entries[i];
1277                 str = osi->string;
1278
1279                 if (*str == '\0')
1280                         break;
1281                 if (osi->enable) {
1282                         status = acpi_install_interface(str);
1283
1284                         if (ACPI_SUCCESS(status))
1285                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1286                 } else {
1287                         status = acpi_remove_interface(str);
1288
1289                         if (ACPI_SUCCESS(status))
1290                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1291                 }
1292         }
1293 }
1294
1295 static int __init osi_setup(char *str)
1296 {
1297         if (str && !strcmp("Linux", str))
1298                 acpi_cmdline_osi_linux(1);
1299         else if (str && !strcmp("!Linux", str))
1300                 acpi_cmdline_osi_linux(0);
1301         else
1302                 acpi_osi_setup(str);
1303
1304         return 1;
1305 }
1306
1307 __setup("acpi_osi=", osi_setup);
1308
1309 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1310 static int __init acpi_serialize_setup(char *str)
1311 {
1312         printk(KERN_INFO PREFIX "serialize enabled\n");
1313
1314         acpi_gbl_all_methods_serialized = TRUE;
1315
1316         return 1;
1317 }
1318
1319 __setup("acpi_serialize", acpi_serialize_setup);
1320
1321 /* Check of resource interference between native drivers and ACPI
1322  * OperationRegions (SystemIO and System Memory only).
1323  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1324  * in arbitrary AML code and can interfere with legacy drivers.
1325  * acpi_enforce_resources= can be set to:
1326  *
1327  *   - strict (default) (2)
1328  *     -> further driver trying to access the resources will not load
1329  *   - lax              (1)
1330  *     -> further driver trying to access the resources will load, but you
1331  *     get a system message that something might go wrong...
1332  *
1333  *   - no               (0)
1334  *     -> ACPI Operation Region resources will not be registered
1335  *
1336  */
1337 #define ENFORCE_RESOURCES_STRICT 2
1338 #define ENFORCE_RESOURCES_LAX    1
1339 #define ENFORCE_RESOURCES_NO     0
1340
1341 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1342
1343 static int __init acpi_enforce_resources_setup(char *str)
1344 {
1345         if (str == NULL || *str == '\0')
1346                 return 0;
1347
1348         if (!strcmp("strict", str))
1349                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1350         else if (!strcmp("lax", str))
1351                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1352         else if (!strcmp("no", str))
1353                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1354
1355         return 1;
1356 }
1357
1358 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1359
1360 /* Check for resource conflicts between ACPI OperationRegions and native
1361  * drivers */
1362 int acpi_check_resource_conflict(const struct resource *res)
1363 {
1364         acpi_adr_space_type space_id;
1365         acpi_size length;
1366         u8 warn = 0;
1367         int clash = 0;
1368
1369         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1370                 return 0;
1371         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1372                 return 0;
1373
1374         if (res->flags & IORESOURCE_IO)
1375                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1376         else
1377                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1378
1379         length = res->end - res->start + 1;
1380         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1381                 warn = 1;
1382         clash = acpi_check_address_range(space_id, res->start, length, warn);
1383
1384         if (clash) {
1385                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1386                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1387                                 printk(KERN_NOTICE "ACPI: This conflict may"
1388                                        " cause random problems and system"
1389                                        " instability\n");
1390                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1391                                " for this device, you should use it instead of"
1392                                " the native driver\n");
1393                 }
1394                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1395                         return -EBUSY;
1396         }
1397         return 0;
1398 }
1399 EXPORT_SYMBOL(acpi_check_resource_conflict);
1400
1401 int acpi_check_region(resource_size_t start, resource_size_t n,
1402                       const char *name)
1403 {
1404         struct resource res = {
1405                 .start = start,
1406                 .end   = start + n - 1,
1407                 .name  = name,
1408                 .flags = IORESOURCE_IO,
1409         };
1410
1411         return acpi_check_resource_conflict(&res);
1412 }
1413 EXPORT_SYMBOL(acpi_check_region);
1414
1415 /*
1416  * Let drivers know whether the resource checks are effective
1417  */
1418 int acpi_resources_are_enforced(void)
1419 {
1420         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1421 }
1422 EXPORT_SYMBOL(acpi_resources_are_enforced);
1423
1424 /*
1425  * Deallocate the memory for a spinlock.
1426  */
1427 void acpi_os_delete_lock(acpi_spinlock handle)
1428 {
1429         ACPI_FREE(handle);
1430 }
1431
1432 /*
1433  * Acquire a spinlock.
1434  *
1435  * handle is a pointer to the spinlock_t.
1436  */
1437
1438 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1439 {
1440         acpi_cpu_flags flags;
1441         spin_lock_irqsave(lockp, flags);
1442         return flags;
1443 }
1444
1445 /*
1446  * Release a spinlock. See above.
1447  */
1448
1449 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1450 {
1451         spin_unlock_irqrestore(lockp, flags);
1452 }
1453
1454 #ifndef ACPI_USE_LOCAL_CACHE
1455
1456 /*******************************************************************************
1457  *
1458  * FUNCTION:    acpi_os_create_cache
1459  *
1460  * PARAMETERS:  name      - Ascii name for the cache
1461  *              size      - Size of each cached object
1462  *              depth     - Maximum depth of the cache (in objects) <ignored>
1463  *              cache     - Where the new cache object is returned
1464  *
1465  * RETURN:      status
1466  *
1467  * DESCRIPTION: Create a cache object
1468  *
1469  ******************************************************************************/
1470
1471 acpi_status
1472 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1473 {
1474         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1475         if (*cache == NULL)
1476                 return AE_ERROR;
1477         else
1478                 return AE_OK;
1479 }
1480
1481 /*******************************************************************************
1482  *
1483  * FUNCTION:    acpi_os_purge_cache
1484  *
1485  * PARAMETERS:  Cache           - Handle to cache object
1486  *
1487  * RETURN:      Status
1488  *
1489  * DESCRIPTION: Free all objects within the requested cache.
1490  *
1491  ******************************************************************************/
1492
1493 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1494 {
1495         kmem_cache_shrink(cache);
1496         return (AE_OK);
1497 }
1498
1499 /*******************************************************************************
1500  *
1501  * FUNCTION:    acpi_os_delete_cache
1502  *
1503  * PARAMETERS:  Cache           - Handle to cache object
1504  *
1505  * RETURN:      Status
1506  *
1507  * DESCRIPTION: Free all objects within the requested cache and delete the
1508  *              cache object.
1509  *
1510  ******************************************************************************/
1511
1512 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1513 {
1514         kmem_cache_destroy(cache);
1515         return (AE_OK);
1516 }
1517
1518 /*******************************************************************************
1519  *
1520  * FUNCTION:    acpi_os_release_object
1521  *
1522  * PARAMETERS:  Cache       - Handle to cache object
1523  *              Object      - The object to be released
1524  *
1525  * RETURN:      None
1526  *
1527  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1528  *              the object is deleted.
1529  *
1530  ******************************************************************************/
1531
1532 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1533 {
1534         kmem_cache_free(cache, object);
1535         return (AE_OK);
1536 }
1537 #endif
1538
1539 acpi_status __init acpi_os_initialize(void)
1540 {
1541         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1542         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1543         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1544         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1545
1546         return AE_OK;
1547 }
1548
1549 acpi_status __init acpi_os_initialize1(void)
1550 {
1551         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1552         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1553         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1554         BUG_ON(!kacpid_wq);
1555         BUG_ON(!kacpi_notify_wq);
1556         BUG_ON(!kacpi_hotplug_wq);
1557         acpi_install_interface_handler(acpi_osi_handler);
1558         acpi_osi_setup_late();
1559         return AE_OK;
1560 }
1561
1562 acpi_status acpi_os_terminate(void)
1563 {
1564         if (acpi_irq_handler) {
1565                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1566                                                  acpi_irq_handler);
1567         }
1568
1569         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1570         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1571         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1572         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1573
1574         destroy_workqueue(kacpid_wq);
1575         destroy_workqueue(kacpi_notify_wq);
1576         destroy_workqueue(kacpi_hotplug_wq);
1577
1578         return AE_OK;
1579 }
1580
1581 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1582                                   u32 pm1b_control)
1583 {
1584         int rc = 0;
1585         if (__acpi_os_prepare_sleep)
1586                 rc = __acpi_os_prepare_sleep(sleep_state,
1587                                              pm1a_control, pm1b_control);
1588         if (rc < 0)
1589                 return AE_ERROR;
1590         else if (rc > 0)
1591                 return AE_CTRL_SKIP;
1592
1593         return AE_OK;
1594 }
1595
1596 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1597                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1598 {
1599         __acpi_os_prepare_sleep = func;
1600 }