Pileus Git - ~andy/linux/blob - 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 (page_is_ram(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 static irqreturn_t acpi_irq(int irq, void *dev_id)
 561 {
 562         u32 handled;
 563
 564         handled = (*acpi_irq_handler) (acpi_irq_context);
 565
 566         if (handled) {
 567                 acpi_irq_handled++;
 568                 return IRQ_HANDLED;
 569         } else {
 570                 acpi_irq_not_handled++;
 571                 return IRQ_NONE;
 572         }
 573 }
 574
 575 acpi_status
 576 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 577                                   void *context)
 578 {
 579         unsigned int irq;
 580
 581         acpi_irq_stats_init();
 582
 583         /*
 584          * ACPI interrupts different from the SCI in our copy of the FADT are
 585          * not supported.
 586          */
 587         if (gsi != acpi_gbl_FADT.sci_interrupt)
 588                 return AE_BAD_PARAMETER;
 589
 590         if (acpi_irq_handler)
 591                 return AE_ALREADY_ACQUIRED;
 592
 593         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 594                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 595                        gsi);
 596                 return AE_OK;
 597         }
 598
 599         acpi_irq_handler = handler;
 600         acpi_irq_context = context;
 601         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 602                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 603                 acpi_irq_handler = NULL;
 604                 return AE_NOT_ACQUIRED;
 605         }
 606
 607         return AE_OK;
 608 }
 609
 610 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 611 {
 612         if (irq != acpi_gbl_FADT.sci_interrupt)
 613                 return AE_BAD_PARAMETER;
 614
 615         free_irq(irq, acpi_irq);
 616         acpi_irq_handler = NULL;
 617
 618         return AE_OK;
 619 }
 620
 621 /*
 622  * Running in interpreter thread context, safe to sleep
 623  */
 624
 625 void acpi_os_sleep(u64 ms)
 626 {
 627         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 628 }
 629
 630 void acpi_os_stall(u32 us)
 631 {
 632         while (us) {
 633                 u32 delay = 1000;
 634
 635                 if (delay > us)
 636                         delay = us;
 637                 udelay(delay);
 638                 touch_nmi_watchdog();
 639                 us -= delay;
 640         }
 641 }
 642
 643 /*
 644  * Support ACPI 3.0 AML Timer operand
 645  * Returns 64-bit free-running, monotonically increasing timer
 646  * with 100ns granularity
 647  */
 648 u64 acpi_os_get_timer(void)
 649 {
 650         static u64 t;
 651
 652 #ifdef  CONFIG_HPET
 653         /* TBD: use HPET if available */
 654 #endif
 655
 656 #ifdef  CONFIG_X86_PM_TIMER
 657         /* TBD: default to PM timer if HPET was not available */
 658 #endif
 659         if (!t)
 660                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 661
 662         return ++t;
 663 }
 664
 665 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 666 {
 667         u32 dummy;
 668
 669         if (!value)
 670                 value = &dummy;
 671
 672         *value = 0;
 673         if (width <= 8) {
 674                 *(u8 *) value = inb(port);
 675         } else if (width <= 16) {
 676                 *(u16 *) value = inw(port);
 677         } else if (width <= 32) {
 678                 *(u32 *) value = inl(port);
 679         } else {
 680                 BUG();
 681         }
 682
 683         return AE_OK;
 684 }
 685
 686 EXPORT_SYMBOL(acpi_os_read_port);
 687
 688 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 689 {
 690         if (width <= 8) {
 691                 outb(value, port);
 692         } else if (width <= 16) {
 693                 outw(value, port);
 694         } else if (width <= 32) {
 695                 outl(value, port);
 696         } else {
 697                 BUG();
 698         }
 699
 700         return AE_OK;
 701 }
 702
 703 EXPORT_SYMBOL(acpi_os_write_port);
 704
 705 acpi_status
 706 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 707 {
 708         void __iomem *virt_addr;
 709         unsigned int size = width / 8;
 710         bool unmap = false;
 711         u32 dummy;
 712
 713         rcu_read_lock();
 714         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 715         if (!virt_addr) {
 716                 rcu_read_unlock();
 717                 virt_addr = acpi_os_ioremap(phys_addr, size);
 718                 if (!virt_addr)
 719                         return AE_BAD_ADDRESS;
 720                 unmap = true;
 721         }
 722
 723         if (!value)
 724                 value = &dummy;
 725
 726         switch (width) {
 727         case 8:
 728                 *(u8 *) value = readb(virt_addr);
 729                 break;
 730         case 16:
 731                 *(u16 *) value = readw(virt_addr);
 732                 break;
 733         case 32:
 734                 *(u32 *) value = readl(virt_addr);
 735                 break;
 736         default:
 737                 BUG();
 738         }
 739
 740         if (unmap)
 741                 iounmap(virt_addr);
 742         else
 743                 rcu_read_unlock();
 744
 745         return AE_OK;
 746 }
 747
 748 #ifdef readq
 749 static inline u64 read64(const volatile void __iomem *addr)
 750 {
 751         return readq(addr);
 752 }
 753 #else
 754 static inline u64 read64(const volatile void __iomem *addr)
 755 {
 756         u64 l, h;
 757         l = readl(addr);
 758         h = readl(addr+4);
 759         return l | (h << 32);
 760 }
 761 #endif
 762
 763 acpi_status
 764 acpi_os_read_memory64(acpi_physical_address phys_addr, u64 *value, u32 width)
 765 {
 766         void __iomem *virt_addr;
 767         unsigned int size = width / 8;
 768         bool unmap = false;
 769         u64 dummy;
 770
 771         rcu_read_lock();
 772         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 773         if (!virt_addr) {
 774                 rcu_read_unlock();
 775                 virt_addr = acpi_os_ioremap(phys_addr, size);
 776                 if (!virt_addr)
 777                         return AE_BAD_ADDRESS;
 778                 unmap = true;
 779         }
 780
 781         if (!value)
 782                 value = &dummy;
 783
 784         switch (width) {
 785         case 8:
 786                 *(u8 *) value = readb(virt_addr);
 787                 break;
 788         case 16:
 789                 *(u16 *) value = readw(virt_addr);
 790                 break;
 791         case 32:
 792                 *(u32 *) value = readl(virt_addr);
 793                 break;
 794         case 64:
 795                 *(u64 *) value = read64(virt_addr);
 796                 break;
 797         default:
 798                 BUG();
 799         }
 800
 801         if (unmap)
 802                 iounmap(virt_addr);
 803         else
 804                 rcu_read_unlock();
 805
 806         return AE_OK;
 807 }
 808
 809 acpi_status
 810 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 811 {
 812         void __iomem *virt_addr;
 813         unsigned int size = width / 8;
 814         bool unmap = false;
 815
 816         rcu_read_lock();
 817         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 818         if (!virt_addr) {
 819                 rcu_read_unlock();
 820                 virt_addr = acpi_os_ioremap(phys_addr, size);
 821                 if (!virt_addr)
 822                         return AE_BAD_ADDRESS;
 823                 unmap = true;
 824         }
 825
 826         switch (width) {
 827         case 8:
 828                 writeb(value, virt_addr);
 829                 break;
 830         case 16:
 831                 writew(value, virt_addr);
 832                 break;
 833         case 32:
 834                 writel(value, virt_addr);
 835                 break;
 836         default:
 837                 BUG();
 838         }
 839
 840         if (unmap)
 841                 iounmap(virt_addr);
 842         else
 843                 rcu_read_unlock();
 844
 845         return AE_OK;
 846 }
 847
 848 #ifdef writeq
 849 static inline void write64(u64 val, volatile void __iomem *addr)
 850 {
 851         writeq(val, addr);
 852 }
 853 #else
 854 static inline void write64(u64 val, volatile void __iomem *addr)
 855 {
 856         writel(val, addr);
 857         writel(val>>32, addr+4);
 858 }
 859 #endif
 860
 861 acpi_status
 862 acpi_os_write_memory64(acpi_physical_address phys_addr, u64 value, u32 width)
 863 {
 864         void __iomem *virt_addr;
 865         unsigned int size = width / 8;
 866         bool unmap = false;
 867
 868         rcu_read_lock();
 869         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 870         if (!virt_addr) {
 871                 rcu_read_unlock();
 872                 virt_addr = acpi_os_ioremap(phys_addr, size);
 873                 if (!virt_addr)
 874                         return AE_BAD_ADDRESS;
 875                 unmap = true;
 876         }
 877
 878         switch (width) {
 879         case 8:
 880                 writeb(value, virt_addr);
 881                 break;
 882         case 16:
 883                 writew(value, virt_addr);
 884                 break;
 885         case 32:
 886                 writel(value, virt_addr);
 887                 break;
 888         case 64:
 889                 write64(value, virt_addr);
 890                 break;
 891         default:
 892                 BUG();
 893         }
 894
 895         if (unmap)
 896                 iounmap(virt_addr);
 897         else
 898                 rcu_read_unlock();
 899
 900         return AE_OK;
 901 }
 902
 903 acpi_status
 904 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 905                                u64 *value, u32 width)
 906 {
 907         int result, size;
 908         u32 value32;
 909
 910         if (!value)
 911                 return AE_BAD_PARAMETER;
 912
 913         switch (width) {
 914         case 8:
 915                 size = 1;
 916                 break;
 917         case 16:
 918                 size = 2;
 919                 break;
 920         case 32:
 921                 size = 4;
 922                 break;
 923         default:
 924                 return AE_ERROR;
 925         }
 926
 927         result = raw_pci_read(pci_id->segment, pci_id->bus,
 928                                 PCI_DEVFN(pci_id->device, pci_id->function),
 929                                 reg, size, &value32);
 930         *value = value32;
 931
 932         return (result ? AE_ERROR : AE_OK);
 933 }
 934
 935 acpi_status
 936 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 937                                 u64 value, u32 width)
 938 {
 939         int result, size;
 940
 941         switch (width) {
 942         case 8:
 943                 size = 1;
 944                 break;
 945         case 16:
 946                 size = 2;
 947                 break;
 948         case 32:
 949                 size = 4;
 950                 break;
 951         default:
 952                 return AE_ERROR;
 953         }
 954
 955         result = raw_pci_write(pci_id->segment, pci_id->bus,
 956                                 PCI_DEVFN(pci_id->device, pci_id->function),
 957                                 reg, size, value);
 958
 959         return (result ? AE_ERROR : AE_OK);
 960 }
 961
 962 static void acpi_os_execute_deferred(struct work_struct *work)
 963 {
 964         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 965
 966         if (dpc->wait)
 967                 acpi_os_wait_events_complete(NULL);
 968
 969         dpc->function(dpc->context);
 970         kfree(dpc);
 971 }
 972
 973 /*******************************************************************************
 974  *
 975  * FUNCTION:    acpi_os_execute
 976  *
 977  * PARAMETERS:  Type               - Type of the callback
 978  *              Function           - Function to be executed
 979  *              Context            - Function parameters
 980  *
 981  * RETURN:      Status
 982  *
 983  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 984  *              immediately executes function on a separate thread.
 985  *
 986  ******************************************************************************/
 987
 988 static acpi_status __acpi_os_execute(acpi_execute_type type,
 989         acpi_osd_exec_callback function, void *context, int hp)
 990 {
 991         acpi_status status = AE_OK;
 992         struct acpi_os_dpc *dpc;
 993         struct workqueue_struct *queue;
 994         int ret;
 995         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 996                           "Scheduling function [%p(%p)] for deferred execution.\n",
 997                           function, context));
 998
 999         /*
1000          * Allocate/initialize DPC structure.  Note that this memory will be
1001          * freed by the callee.  The kernel handles the work_struct list  in a
1002          * way that allows us to also free its memory inside the callee.
1003          * Because we may want to schedule several tasks with different
1004          * parameters we can't use the approach some kernel code uses of
1005          * having a static work_struct.
1006          */
1007
1008         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1009         if (!dpc)
1010                 return AE_NO_MEMORY;
1011
1012         dpc->function = function;
1013         dpc->context = context;
1014
1015         /*
1016          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1017          * because the hotplug code may call driver .remove() functions,
1018          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1019          * to flush these workqueues.
1020          */
1021         queue = hp ? kacpi_hotplug_wq :
1022                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
1023         dpc->wait = hp ? 1 : 0;
1024
1025         if (queue == kacpi_hotplug_wq)
1026                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1027         else if (queue == kacpi_notify_wq)
1028                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1029         else
1030                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1031
1032         /*
1033          * On some machines, a software-initiated SMI causes corruption unless
1034          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1035          * typically it's done in GPE-related methods that are run via
1036          * workqueues, so we can avoid the known corruption cases by always
1037          * queueing on CPU 0.
1038          */
1039         ret = queue_work_on(0, queue, &dpc->work);
1040
1041         if (!ret) {
1042                 printk(KERN_ERR PREFIX
1043                           "Call to queue_work() failed.\n");
1044                 status = AE_ERROR;
1045                 kfree(dpc);
1046         }
1047         return status;
1048 }
1049
1050 acpi_status acpi_os_execute(acpi_execute_type type,
1051                             acpi_osd_exec_callback function, void *context)
1052 {
1053         return __acpi_os_execute(type, function, context, 0);
1054 }
1055 EXPORT_SYMBOL(acpi_os_execute);
1056
1057 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1058         void *context)
1059 {
1060         return __acpi_os_execute(0, function, context, 1);
1061 }
1062
1063 void acpi_os_wait_events_complete(void *context)
1064 {
1065         flush_workqueue(kacpid_wq);
1066         flush_workqueue(kacpi_notify_wq);
1067 }
1068
1069 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1070
1071 acpi_status
1072 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1073 {
1074         struct semaphore *sem = NULL;
1075
1076         sem = acpi_os_allocate(sizeof(struct semaphore));
1077         if (!sem)
1078                 return AE_NO_MEMORY;
1079         memset(sem, 0, sizeof(struct semaphore));
1080
1081         sema_init(sem, initial_units);
1082
1083         *handle = (acpi_handle *) sem;
1084
1085         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1086                           *handle, initial_units));
1087
1088         return AE_OK;
1089 }
1090
1091 /*
1092  * TODO: A better way to delete semaphores?  Linux doesn't have a
1093  * 'delete_semaphore()' function -- may result in an invalid
1094  * pointer dereference for non-synchronized consumers.  Should
1095  * we at least check for blocked threads and signal/cancel them?
1096  */
1097
1098 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1099 {
1100         struct semaphore *sem = (struct semaphore *)handle;
1101
1102         if (!sem)
1103                 return AE_BAD_PARAMETER;
1104
1105         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1106
1107         BUG_ON(!list_empty(&sem->wait_list));
1108         kfree(sem);
1109         sem = NULL;
1110
1111         return AE_OK;
1112 }
1113
1114 /*
1115  * TODO: Support for units > 1?
1116  */
1117 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1118 {
1119         acpi_status status = AE_OK;
1120         struct semaphore *sem = (struct semaphore *)handle;
1121         long jiffies;
1122         int ret = 0;
1123
1124         if (!sem || (units < 1))
1125                 return AE_BAD_PARAMETER;
1126
1127         if (units > 1)
1128                 return AE_SUPPORT;
1129
1130         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1131                           handle, units, timeout));
1132
1133         if (timeout == ACPI_WAIT_FOREVER)
1134                 jiffies = MAX_SCHEDULE_TIMEOUT;
1135         else
1136                 jiffies = msecs_to_jiffies(timeout);
1137
1138         ret = down_timeout(sem, jiffies);
1139         if (ret)
1140                 status = AE_TIME;
1141
1142         if (ACPI_FAILURE(status)) {
1143                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1144                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1145                                   handle, units, timeout,
1146                                   acpi_format_exception(status)));
1147         } else {
1148                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1149                                   "Acquired semaphore[%p|%d|%d]", handle,
1150                                   units, timeout));
1151         }
1152
1153         return status;
1154 }
1155
1156 /*
1157  * TODO: Support for units > 1?
1158  */
1159 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1160 {
1161         struct semaphore *sem = (struct semaphore *)handle;
1162
1163         if (!sem || (units < 1))
1164                 return AE_BAD_PARAMETER;
1165
1166         if (units > 1)
1167                 return AE_SUPPORT;
1168
1169         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1170                           units));
1171
1172         up(sem);
1173
1174         return AE_OK;
1175 }
1176
1177 #ifdef ACPI_FUTURE_USAGE
1178 u32 acpi_os_get_line(char *buffer)
1179 {
1180
1181 #ifdef ENABLE_DEBUGGER
1182         if (acpi_in_debugger) {
1183                 u32 chars;
1184
1185                 kdb_read(buffer, sizeof(line_buf));
1186
1187                 /* remove the CR kdb includes */
1188                 chars = strlen(buffer) - 1;
1189                 buffer[chars] = '\0';
1190         }
1191 #endif
1192
1193         return 0;
1194 }
1195 #endif                          /*  ACPI_FUTURE_USAGE  */
1196
1197 acpi_status acpi_os_signal(u32 function, void *info)
1198 {
1199         switch (function) {
1200         case ACPI_SIGNAL_FATAL:
1201                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1202                 break;
1203         case ACPI_SIGNAL_BREAKPOINT:
1204                 /*
1205                  * AML Breakpoint
1206                  * ACPI spec. says to treat it as a NOP unless
1207                  * you are debugging.  So if/when we integrate
1208                  * AML debugger into the kernel debugger its
1209                  * hook will go here.  But until then it is
1210                  * not useful to print anything on breakpoints.
1211                  */
1212                 break;
1213         default:
1214                 break;
1215         }
1216
1217         return AE_OK;
1218 }
1219
1220 static int __init acpi_os_name_setup(char *str)
1221 {
1222         char *p = acpi_os_name;
1223         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1224
1225         if (!str || !*str)
1226                 return 0;
1227
1228         for (; count-- && str && *str; str++) {
1229                 if (isalnum(*str) || *str == ' ' || *str == ':')
1230                         *p++ = *str;
1231                 else if (*str == '\'' || *str == '"')
1232                         continue;
1233                 else
1234                         break;
1235         }
1236         *p = 0;
1237
1238         return 1;
1239
1240 }
1241
1242 __setup("acpi_os_name=", acpi_os_name_setup);
1243
1244 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1245 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1246
1247 struct osi_setup_entry {
1248         char string[OSI_STRING_LENGTH_MAX];
1249         bool enable;
1250 };
1251
1252 static struct osi_setup_entry __initdata
1253                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1254         {"Module Device", true},
1255         {"Processor Device", true},
1256         {"3.0 _SCP Extensions", true},
1257         {"Processor Aggregator Device", true},
1258 };
1259
1260 void __init acpi_osi_setup(char *str)
1261 {
1262         struct osi_setup_entry *osi;
1263         bool enable = true;
1264         int i;
1265
1266         if (!acpi_gbl_create_osi_method)
1267                 return;
1268
1269         if (str == NULL || *str == '\0') {
1270                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1271                 acpi_gbl_create_osi_method = FALSE;
1272                 return;
1273         }
1274
1275         if (*str == '!') {
1276                 str++;
1277                 enable = false;
1278         }
1279
1280         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1281                 osi = &osi_setup_entries[i];
1282                 if (!strcmp(osi->string, str)) {
1283                         osi->enable = enable;
1284                         break;
1285                 } else if (osi->string[0] == '\0') {
1286                         osi->enable = enable;
1287                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1288                         break;
1289                 }
1290         }
1291 }
1292
1293 static void __init set_osi_linux(unsigned int enable)
1294 {
1295         if (osi_linux.enable != enable)
1296                 osi_linux.enable = enable;
1297
1298         if (osi_linux.enable)
1299                 acpi_osi_setup("Linux");
1300         else
1301                 acpi_osi_setup("!Linux");
1302
1303         return;
1304 }
1305
1306 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1307 {
1308         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1309         osi_linux.dmi = 0;
1310         set_osi_linux(enable);
1311
1312         return;
1313 }
1314
1315 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1316 {
1317         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1318
1319         if (enable == -1)
1320                 return;
1321
1322         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1323         set_osi_linux(enable);
1324
1325         return;
1326 }
1327
1328 /*
1329  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1330  *
1331  * empty string disables _OSI
1332  * string starting with '!' disables that string
1333  * otherwise string is added to list, augmenting built-in strings
1334  */
1335 static void __init acpi_osi_setup_late(void)
1336 {
1337         struct osi_setup_entry *osi;
1338         char *str;
1339         int i;
1340         acpi_status status;
1341
1342         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1343                 osi = &osi_setup_entries[i];
1344                 str = osi->string;
1345
1346                 if (*str == '\0')
1347                         break;
1348                 if (osi->enable) {
1349                         status = acpi_install_interface(str);
1350
1351                         if (ACPI_SUCCESS(status))
1352                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1353                 } else {
1354                         status = acpi_remove_interface(str);
1355
1356                         if (ACPI_SUCCESS(status))
1357                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1358                 }
1359         }
1360 }
1361
1362 static int __init osi_setup(char *str)
1363 {
1364         if (str && !strcmp("Linux", str))
1365                 acpi_cmdline_osi_linux(1);
1366         else if (str && !strcmp("!Linux", str))
1367                 acpi_cmdline_osi_linux(0);
1368         else
1369                 acpi_osi_setup(str);
1370
1371         return 1;
1372 }
1373
1374 __setup("acpi_osi=", osi_setup);
1375
1376 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1377 static int __init acpi_serialize_setup(char *str)
1378 {
1379         printk(KERN_INFO PREFIX "serialize enabled\n");
1380
1381         acpi_gbl_all_methods_serialized = TRUE;
1382
1383         return 1;
1384 }
1385
1386 __setup("acpi_serialize", acpi_serialize_setup);
1387
1388 /* Check of resource interference between native drivers and ACPI
1389  * OperationRegions (SystemIO and System Memory only).
1390  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1391  * in arbitrary AML code and can interfere with legacy drivers.
1392  * acpi_enforce_resources= can be set to:
1393  *
1394  *   - strict (default) (2)
1395  *     -> further driver trying to access the resources will not load
1396  *   - lax              (1)
1397  *     -> further driver trying to access the resources will load, but you
1398  *     get a system message that something might go wrong...
1399  *
1400  *   - no               (0)
1401  *     -> ACPI Operation Region resources will not be registered
1402  *
1403  */
1404 #define ENFORCE_RESOURCES_STRICT 2
1405 #define ENFORCE_RESOURCES_LAX    1
1406 #define ENFORCE_RESOURCES_NO     0
1407
1408 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1409
1410 static int __init acpi_enforce_resources_setup(char *str)
1411 {
1412         if (str == NULL || *str == '\0')
1413                 return 0;
1414
1415         if (!strcmp("strict", str))
1416                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1417         else if (!strcmp("lax", str))
1418                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1419         else if (!strcmp("no", str))
1420                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1421
1422         return 1;
1423 }
1424
1425 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1426
1427 /* Check for resource conflicts between ACPI OperationRegions and native
1428  * drivers */
1429 int acpi_check_resource_conflict(const struct resource *res)
1430 {
1431         acpi_adr_space_type space_id;
1432         acpi_size length;
1433         u8 warn = 0;
1434         int clash = 0;
1435
1436         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1437                 return 0;
1438         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1439                 return 0;
1440
1441         if (res->flags & IORESOURCE_IO)
1442                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1443         else
1444                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1445
1446         length = res->end - res->start + 1;
1447         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1448                 warn = 1;
1449         clash = acpi_check_address_range(space_id, res->start, length, warn);
1450
1451         if (clash) {
1452                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1453                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1454                                 printk(KERN_NOTICE "ACPI: This conflict may"
1455                                        " cause random problems and system"
1456                                        " instability\n");
1457                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1458                                " for this device, you should use it instead of"
1459                                " the native driver\n");
1460                 }
1461                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1462                         return -EBUSY;
1463         }
1464         return 0;
1465 }
1466 EXPORT_SYMBOL(acpi_check_resource_conflict);
1467
1468 int acpi_check_region(resource_size_t start, resource_size_t n,
1469                       const char *name)
1470 {
1471         struct resource res = {
1472                 .start = start,
1473                 .end   = start + n - 1,
1474                 .name  = name,
1475                 .flags = IORESOURCE_IO,
1476         };
1477
1478         return acpi_check_resource_conflict(&res);
1479 }
1480 EXPORT_SYMBOL(acpi_check_region);
1481
1482 /*
1483  * Let drivers know whether the resource checks are effective
1484  */
1485 int acpi_resources_are_enforced(void)
1486 {
1487         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1488 }
1489 EXPORT_SYMBOL(acpi_resources_are_enforced);
1490
1491 /*
1492  * Deallocate the memory for a spinlock.
1493  */
1494 void acpi_os_delete_lock(acpi_spinlock handle)
1495 {
1496         ACPI_FREE(handle);
1497 }
1498
1499 /*
1500  * Acquire a spinlock.
1501  *
1502  * handle is a pointer to the spinlock_t.
1503  */
1504
1505 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1506 {
1507         acpi_cpu_flags flags;
1508         spin_lock_irqsave(lockp, flags);
1509         return flags;
1510 }
1511
1512 /*
1513  * Release a spinlock. See above.
1514  */
1515
1516 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1517 {
1518         spin_unlock_irqrestore(lockp, flags);
1519 }
1520
1521 #ifndef ACPI_USE_LOCAL_CACHE
1522
1523 /*******************************************************************************
1524  *
1525  * FUNCTION:    acpi_os_create_cache
1526  *
1527  * PARAMETERS:  name      - Ascii name for the cache
1528  *              size      - Size of each cached object
1529  *              depth     - Maximum depth of the cache (in objects) <ignored>
1530  *              cache     - Where the new cache object is returned
1531  *
1532  * RETURN:      status
1533  *
1534  * DESCRIPTION: Create a cache object
1535  *
1536  ******************************************************************************/
1537
1538 acpi_status
1539 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1540 {
1541         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1542         if (*cache == NULL)
1543                 return AE_ERROR;
1544         else
1545                 return AE_OK;
1546 }
1547
1548 /*******************************************************************************
1549  *
1550  * FUNCTION:    acpi_os_purge_cache
1551  *
1552  * PARAMETERS:  Cache           - Handle to cache object
1553  *
1554  * RETURN:      Status
1555  *
1556  * DESCRIPTION: Free all objects within the requested cache.
1557  *
1558  ******************************************************************************/
1559
1560 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1561 {
1562         kmem_cache_shrink(cache);
1563         return (AE_OK);
1564 }
1565
1566 /*******************************************************************************
1567  *
1568  * FUNCTION:    acpi_os_delete_cache
1569  *
1570  * PARAMETERS:  Cache           - Handle to cache object
1571  *
1572  * RETURN:      Status
1573  *
1574  * DESCRIPTION: Free all objects within the requested cache and delete the
1575  *              cache object.
1576  *
1577  ******************************************************************************/
1578
1579 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1580 {
1581         kmem_cache_destroy(cache);
1582         return (AE_OK);
1583 }
1584
1585 /*******************************************************************************
1586  *
1587  * FUNCTION:    acpi_os_release_object
1588  *
1589  * PARAMETERS:  Cache       - Handle to cache object
1590  *              Object      - The object to be released
1591  *
1592  * RETURN:      None
1593  *
1594  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1595  *              the object is deleted.
1596  *
1597  ******************************************************************************/
1598
1599 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1600 {
1601         kmem_cache_free(cache, object);
1602         return (AE_OK);
1603 }
1604 #endif
1605
1606 acpi_status __init acpi_os_initialize(void)
1607 {
1608         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1609         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1610         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1611         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1612
1613         return AE_OK;
1614 }
1615
1616 acpi_status __init acpi_os_initialize1(void)
1617 {
1618         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1619         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1620         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1621         BUG_ON(!kacpid_wq);
1622         BUG_ON(!kacpi_notify_wq);
1623         BUG_ON(!kacpi_hotplug_wq);
1624         acpi_install_interface_handler(acpi_osi_handler);
1625         acpi_osi_setup_late();
1626         return AE_OK;
1627 }
1628
1629 acpi_status acpi_os_terminate(void)
1630 {
1631         if (acpi_irq_handler) {
1632                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1633                                                  acpi_irq_handler);
1634         }
1635
1636         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1637         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1638         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1639         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1640
1641         destroy_workqueue(kacpid_wq);
1642         destroy_workqueue(kacpi_notify_wq);
1643         destroy_workqueue(kacpi_hotplug_wq);
1644
1645         return AE_OK;
1646 }
1647
1648 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1649                                   u32 pm1b_control)
1650 {
1651         int rc = 0;
1652         if (__acpi_os_prepare_sleep)
1653                 rc = __acpi_os_prepare_sleep(sleep_state,
1654                                              pm1a_control, pm1b_control);
1655         if (rc < 0)
1656                 return AE_ERROR;
1657         else if (rc > 0)
1658                 return AE_CTRL_SKIP;
1659
1660         return AE_OK;
1661 }
1662
1663 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1664                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1665 {
1666         __acpi_os_prepare_sleep = func;
1667 }