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 #include "internal.h"
  56
  57 #define _COMPONENT              ACPI_OS_SERVICES
  58 ACPI_MODULE_NAME("osl");
  59 #define PREFIX          "ACPI: "
  60 struct acpi_os_dpc {
  61         acpi_osd_exec_callback function;
  62         void *context;
  63         struct work_struct work;
  64         int wait;
  65 };
  66
  67 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  68 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  69 #endif
  70
  71 #ifdef ENABLE_DEBUGGER
  72 #include <linux/kdb.h>
  73
  74 /* stuff for debugger support */
  75 int acpi_in_debugger;
  76 EXPORT_SYMBOL(acpi_in_debugger);
  77
  78 extern char line_buf[80];
  79 #endif                          /*ENABLE_DEBUGGER */
  80
  81 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  82                                       u32 pm1b_ctrl);
  83 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  84                                       u32 val_b);
  85
  86 static acpi_osd_handler acpi_irq_handler;
  87 static void *acpi_irq_context;
  88 static struct workqueue_struct *kacpid_wq;
  89 static struct workqueue_struct *kacpi_notify_wq;
  90 static struct workqueue_struct *kacpi_hotplug_wq;
  91
  92 /*
  93  * This list of permanent mappings is for memory that may be accessed from
  94  * interrupt context, where we can't do the ioremap().
  95  */
  96 struct acpi_ioremap {
  97         struct list_head list;
  98         void __iomem *virt;
  99         acpi_physical_address phys;
 100         acpi_size size;
 101         unsigned long refcount;
 102 };
 103
 104 static LIST_HEAD(acpi_ioremaps);
 105 static DEFINE_MUTEX(acpi_ioremap_lock);
 106
 107 static void __init acpi_osi_setup_late(void);
 108
 109 /*
 110  * The story of _OSI(Linux)
 111  *
 112  * From pre-history through Linux-2.6.22,
 113  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 114  *
 115  * Unfortunately, reference BIOS writers got wind of this
 116  * and put OSI(Linux) in their example code, quickly exposing
 117  * this string as ill-conceived and opening the door to
 118  * an un-bounded number of BIOS incompatibilities.
 119  *
 120  * For example, OSI(Linux) was used on resume to re-POST a
 121  * video card on one system, because Linux at that time
 122  * could not do a speedy restore in its native driver.
 123  * But then upon gaining quick native restore capability,
 124  * Linux has no way to tell the BIOS to skip the time-consuming
 125  * POST -- putting Linux at a permanent performance disadvantage.
 126  * On another system, the BIOS writer used OSI(Linux)
 127  * to infer native OS support for IPMI!  On other systems,
 128  * OSI(Linux) simply got in the way of Linux claiming to
 129  * be compatible with other operating systems, exposing
 130  * BIOS issues such as skipped device initialization.
 131  *
 132  * So "Linux" turned out to be a really poor chose of
 133  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 134  *
 135  * BIOS writers should NOT query _OSI(Linux) on future systems.
 136  * Linux will complain on the console when it sees it, and return FALSE.
 137  * To get Linux to return TRUE for your system  will require
 138  * a kernel source update to add a DMI entry,
 139  * or boot with "acpi_osi=Linux"
 140  */
 141
 142 static struct osi_linux {
 143         unsigned int    enable:1;
 144         unsigned int    dmi:1;
 145         unsigned int    cmdline:1;
 146         unsigned int    default_disabling:1;
 147 } osi_linux = {0, 0, 0, 0};
 148
 149 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 150 {
 151         if (!strcmp("Linux", interface)) {
 152
 153                 printk_once(KERN_NOTICE FW_BUG PREFIX
 154                         "BIOS _OSI(Linux) query %s%s\n",
 155                         osi_linux.enable ? "honored" : "ignored",
 156                         osi_linux.cmdline ? " via cmdline" :
 157                         osi_linux.dmi ? " via DMI" : "");
 158         }
 159
 160         return supported;
 161 }
 162
 163 static void __init acpi_request_region (struct acpi_generic_address *gas,
 164         unsigned int length, char *desc)
 165 {
 166         u64 addr;
 167
 168         /* Handle possible alignment issues */
 169         memcpy(&addr, &gas->address, sizeof(addr));
 170         if (!addr || !length)
 171                 return;
 172
 173         /* Resources are never freed */
 174         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 175                 request_region(addr, length, desc);
 176         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 177                 request_mem_region(addr, length, desc);
 178 }
 179
 180 static int __init acpi_reserve_resources(void)
 181 {
 182         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 183                 "ACPI PM1a_EVT_BLK");
 184
 185         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 186                 "ACPI PM1b_EVT_BLK");
 187
 188         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 189                 "ACPI PM1a_CNT_BLK");
 190
 191         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 192                 "ACPI PM1b_CNT_BLK");
 193
 194         if (acpi_gbl_FADT.pm_timer_length == 4)
 195                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 196
 197         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 198                 "ACPI PM2_CNT_BLK");
 199
 200         /* Length of GPE blocks must be a non-negative multiple of 2 */
 201
 202         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 203                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 204                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 205
 206         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 207                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 208                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 209
 210         return 0;
 211 }
 212 device_initcall(acpi_reserve_resources);
 213
 214 void acpi_os_printf(const char *fmt, ...)
 215 {
 216         va_list args;
 217         va_start(args, fmt);
 218         acpi_os_vprintf(fmt, args);
 219         va_end(args);
 220 }
 221
 222 void acpi_os_vprintf(const char *fmt, va_list args)
 223 {
 224         static char buffer[512];
 225
 226         vsprintf(buffer, fmt, args);
 227
 228 #ifdef ENABLE_DEBUGGER
 229         if (acpi_in_debugger) {
 230                 kdb_printf("%s", buffer);
 231         } else {
 232                 printk(KERN_CONT "%s", buffer);
 233         }
 234 #else
 235         printk(KERN_CONT "%s", buffer);
 236 #endif
 237 }
 238
 239 #ifdef CONFIG_KEXEC
 240 static unsigned long acpi_rsdp;
 241 static int __init setup_acpi_rsdp(char *arg)
 242 {
 243         acpi_rsdp = simple_strtoul(arg, NULL, 16);
 244         return 0;
 245 }
 246 early_param("acpi_rsdp", setup_acpi_rsdp);
 247 #endif
 248
 249 acpi_physical_address __init acpi_os_get_root_pointer(void)
 250 {
 251 #ifdef CONFIG_KEXEC
 252         if (acpi_rsdp)
 253                 return acpi_rsdp;
 254 #endif
 255
 256         if (efi_enabled(EFI_CONFIG_TABLES)) {
 257                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 258                         return efi.acpi20;
 259                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 260                         return efi.acpi;
 261                 else {
 262                         printk(KERN_ERR PREFIX
 263                                "System description tables not found\n");
 264                         return 0;
 265                 }
 266         } else {
 267                 acpi_physical_address pa = 0;
 268
 269                 acpi_find_root_pointer(&pa);
 270                 return pa;
 271         }
 272 }
 273
 274 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 275 static struct acpi_ioremap *
 276 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 277 {
 278         struct acpi_ioremap *map;
 279
 280         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 281                 if (map->phys <= phys &&
 282                     phys + size <= map->phys + map->size)
 283                         return map;
 284
 285         return NULL;
 286 }
 287
 288 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 289 static void __iomem *
 290 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 291 {
 292         struct acpi_ioremap *map;
 293
 294         map = acpi_map_lookup(phys, size);
 295         if (map)
 296                 return map->virt + (phys - map->phys);
 297
 298         return NULL;
 299 }
 300
 301 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 302 {
 303         struct acpi_ioremap *map;
 304         void __iomem *virt = NULL;
 305
 306         mutex_lock(&acpi_ioremap_lock);
 307         map = acpi_map_lookup(phys, size);
 308         if (map) {
 309                 virt = map->virt + (phys - map->phys);
 310                 map->refcount++;
 311         }
 312         mutex_unlock(&acpi_ioremap_lock);
 313         return virt;
 314 }
 315 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 316
 317 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 318 static struct acpi_ioremap *
 319 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 320 {
 321         struct acpi_ioremap *map;
 322
 323         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 324                 if (map->virt <= virt &&
 325                     virt + size <= map->virt + map->size)
 326                         return map;
 327
 328         return NULL;
 329 }
 330
 331 #ifndef CONFIG_IA64
 332 #define should_use_kmap(pfn)   page_is_ram(pfn)
 333 #else
 334 /* ioremap will take care of cache attributes */
 335 #define should_use_kmap(pfn)   0
 336 #endif
 337
 338 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 339 {
 340         unsigned long pfn;
 341
 342         pfn = pg_off >> PAGE_SHIFT;
 343         if (should_use_kmap(pfn)) {
 344                 if (pg_sz > PAGE_SIZE)
 345                         return NULL;
 346                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 347         } else
 348                 return acpi_os_ioremap(pg_off, pg_sz);
 349 }
 350
 351 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 352 {
 353         unsigned long pfn;
 354
 355         pfn = pg_off >> PAGE_SHIFT;
 356         if (should_use_kmap(pfn))
 357                 kunmap(pfn_to_page(pfn));
 358         else
 359                 iounmap(vaddr);
 360 }
 361
 362 void __iomem *__init_refok
 363 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 364 {
 365         struct acpi_ioremap *map;
 366         void __iomem *virt;
 367         acpi_physical_address pg_off;
 368         acpi_size pg_sz;
 369
 370         if (phys > ULONG_MAX) {
 371                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 372                 return NULL;
 373         }
 374
 375         if (!acpi_gbl_permanent_mmap)
 376                 return __acpi_map_table((unsigned long)phys, size);
 377
 378         mutex_lock(&acpi_ioremap_lock);
 379         /* Check if there's a suitable mapping already. */
 380         map = acpi_map_lookup(phys, size);
 381         if (map) {
 382                 map->refcount++;
 383                 goto out;
 384         }
 385
 386         map = kzalloc(sizeof(*map), GFP_KERNEL);
 387         if (!map) {
 388                 mutex_unlock(&acpi_ioremap_lock);
 389                 return NULL;
 390         }
 391
 392         pg_off = round_down(phys, PAGE_SIZE);
 393         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 394         virt = acpi_map(pg_off, pg_sz);
 395         if (!virt) {
 396                 mutex_unlock(&acpi_ioremap_lock);
 397                 kfree(map);
 398                 return NULL;
 399         }
 400
 401         INIT_LIST_HEAD(&map->list);
 402         map->virt = virt;
 403         map->phys = pg_off;
 404         map->size = pg_sz;
 405         map->refcount = 1;
 406
 407         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 408
 409  out:
 410         mutex_unlock(&acpi_ioremap_lock);
 411         return map->virt + (phys - map->phys);
 412 }
 413 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 414
 415 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 416 {
 417         if (!--map->refcount)
 418                 list_del_rcu(&map->list);
 419 }
 420
 421 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 422 {
 423         if (!map->refcount) {
 424                 synchronize_rcu();
 425                 acpi_unmap(map->phys, map->virt);
 426                 kfree(map);
 427         }
 428 }
 429
 430 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 431 {
 432         struct acpi_ioremap *map;
 433
 434         if (!acpi_gbl_permanent_mmap) {
 435                 __acpi_unmap_table(virt, size);
 436                 return;
 437         }
 438
 439         mutex_lock(&acpi_ioremap_lock);
 440         map = acpi_map_lookup_virt(virt, size);
 441         if (!map) {
 442                 mutex_unlock(&acpi_ioremap_lock);
 443                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 444                 return;
 445         }
 446         acpi_os_drop_map_ref(map);
 447         mutex_unlock(&acpi_ioremap_lock);
 448
 449         acpi_os_map_cleanup(map);
 450 }
 451 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 452
 453 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 454 {
 455         if (!acpi_gbl_permanent_mmap)
 456                 __acpi_unmap_table(virt, size);
 457 }
 458
 459 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 460 {
 461         u64 addr;
 462         void __iomem *virt;
 463
 464         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 465                 return 0;
 466
 467         /* Handle possible alignment issues */
 468         memcpy(&addr, &gas->address, sizeof(addr));
 469         if (!addr || !gas->bit_width)
 470                 return -EINVAL;
 471
 472         virt = acpi_os_map_memory(addr, gas->bit_width / 8);
 473         if (!virt)
 474                 return -EIO;
 475
 476         return 0;
 477 }
 478 EXPORT_SYMBOL(acpi_os_map_generic_address);
 479
 480 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 481 {
 482         u64 addr;
 483         struct acpi_ioremap *map;
 484
 485         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 486                 return;
 487
 488         /* Handle possible alignment issues */
 489         memcpy(&addr, &gas->address, sizeof(addr));
 490         if (!addr || !gas->bit_width)
 491                 return;
 492
 493         mutex_lock(&acpi_ioremap_lock);
 494         map = acpi_map_lookup(addr, gas->bit_width / 8);
 495         if (!map) {
 496                 mutex_unlock(&acpi_ioremap_lock);
 497                 return;
 498         }
 499         acpi_os_drop_map_ref(map);
 500         mutex_unlock(&acpi_ioremap_lock);
 501
 502         acpi_os_map_cleanup(map);
 503 }
 504 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 505
 506 #ifdef ACPI_FUTURE_USAGE
 507 acpi_status
 508 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 509 {
 510         if (!phys || !virt)
 511                 return AE_BAD_PARAMETER;
 512
 513         *phys = virt_to_phys(virt);
 514
 515         return AE_OK;
 516 }
 517 #endif
 518
 519 #define ACPI_MAX_OVERRIDE_LEN 100
 520
 521 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 522
 523 acpi_status
 524 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 525                             acpi_string * new_val)
 526 {
 527         if (!init_val || !new_val)
 528                 return AE_BAD_PARAMETER;
 529
 530         *new_val = NULL;
 531         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 532                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 533                        acpi_os_name);
 534                 *new_val = acpi_os_name;
 535         }
 536
 537         return AE_OK;
 538 }
 539
 540 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 541 #include <linux/earlycpio.h>
 542 #include <linux/memblock.h>
 543
 544 static u64 acpi_tables_addr;
 545 static int all_tables_size;
 546
 547 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 548 u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 549 {
 550         u8 sum = 0;
 551         u8 *end = buffer + length;
 552
 553         while (buffer < end)
 554                 sum = (u8) (sum + *(buffer++));
 555         return sum;
 556 }
 557
 558 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 559 static const char * const table_sigs[] = {
 560         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 561         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 562         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 563         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 564         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 565         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 566         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 567         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 568         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 569
 570 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 571
 572 /* Must not increase 10 or needs code modification below */
 573 #define ACPI_OVERRIDE_TABLES 10
 574
 575 void __init acpi_initrd_override(void *data, size_t size)
 576 {
 577         int sig, no, table_nr = 0, total_offset = 0;
 578         long offset = 0;
 579         struct acpi_table_header *table;
 580         char cpio_path[32] = "kernel/firmware/acpi/";
 581         struct cpio_data file;
 582         struct cpio_data early_initrd_files[ACPI_OVERRIDE_TABLES];
 583         char *p;
 584
 585         if (data == NULL || size == 0)
 586                 return;
 587
 588         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 589                 file = find_cpio_data(cpio_path, data, size, &offset);
 590                 if (!file.data)
 591                         break;
 592
 593                 data += offset;
 594                 size -= offset;
 595
 596                 if (file.size < sizeof(struct acpi_table_header)) {
 597                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 598                                 cpio_path, file.name);
 599                         continue;
 600                 }
 601
 602                 table = file.data;
 603
 604                 for (sig = 0; table_sigs[sig]; sig++)
 605                         if (!memcmp(table->signature, table_sigs[sig], 4))
 606                                 break;
 607
 608                 if (!table_sigs[sig]) {
 609                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 610                                 cpio_path, file.name);
 611                         continue;
 612                 }
 613                 if (file.size != table->length) {
 614                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 615                                 cpio_path, file.name);
 616                         continue;
 617                 }
 618                 if (acpi_table_checksum(file.data, table->length)) {
 619                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 620                                 cpio_path, file.name);
 621                         continue;
 622                 }
 623
 624                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 625                         table->signature, cpio_path, file.name, table->length);
 626
 627                 all_tables_size += table->length;
 628                 early_initrd_files[table_nr].data = file.data;
 629                 early_initrd_files[table_nr].size = file.size;
 630                 table_nr++;
 631         }
 632         if (table_nr == 0)
 633                 return;
 634
 635         acpi_tables_addr =
 636                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 637                                        all_tables_size, PAGE_SIZE);
 638         if (!acpi_tables_addr) {
 639                 WARN_ON(1);
 640                 return;
 641         }
 642         /*
 643          * Only calling e820_add_reserve does not work and the
 644          * tables are invalid (memory got used) later.
 645          * memblock_reserve works as expected and the tables won't get modified.
 646          * But it's not enough on X86 because ioremap will
 647          * complain later (used by acpi_os_map_memory) that the pages
 648          * that should get mapped are not marked "reserved".
 649          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 650          * works fine.
 651          */
 652         memblock_reserve(acpi_tables_addr, all_tables_size);
 653         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 654
 655         p = early_ioremap(acpi_tables_addr, all_tables_size);
 656
 657         for (no = 0; no < table_nr; no++) {
 658                 memcpy(p + total_offset, early_initrd_files[no].data,
 659                        early_initrd_files[no].size);
 660                 total_offset += early_initrd_files[no].size;
 661         }
 662         early_iounmap(p, all_tables_size);
 663 }
 664 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 665
 666 static void acpi_table_taint(struct acpi_table_header *table)
 667 {
 668         pr_warn(PREFIX
 669                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 670                 table->signature, table->oem_table_id);
 671         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 672 }
 673
 674
 675 acpi_status
 676 acpi_os_table_override(struct acpi_table_header * existing_table,
 677                        struct acpi_table_header ** new_table)
 678 {
 679         if (!existing_table || !new_table)
 680                 return AE_BAD_PARAMETER;
 681
 682         *new_table = NULL;
 683
 684 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 685         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 686                 *new_table = (struct acpi_table_header *)AmlCode;
 687 #endif
 688         if (*new_table != NULL)
 689                 acpi_table_taint(existing_table);
 690         return AE_OK;
 691 }
 692
 693 acpi_status
 694 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 695                                 acpi_physical_address *address,
 696                                 u32 *table_length)
 697 {
 698 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 699         *table_length = 0;
 700         *address = 0;
 701         return AE_OK;
 702 #else
 703         int table_offset = 0;
 704         struct acpi_table_header *table;
 705
 706         *table_length = 0;
 707         *address = 0;
 708
 709         if (!acpi_tables_addr)
 710                 return AE_OK;
 711
 712         do {
 713                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 714                         WARN_ON(1);
 715                         return AE_OK;
 716                 }
 717
 718                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 719                                            ACPI_HEADER_SIZE);
 720
 721                 if (table_offset + table->length > all_tables_size) {
 722                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 723                         WARN_ON(1);
 724                         return AE_OK;
 725                 }
 726
 727                 table_offset += table->length;
 728
 729                 if (memcmp(existing_table->signature, table->signature, 4)) {
 730                         acpi_os_unmap_memory(table,
 731                                      ACPI_HEADER_SIZE);
 732                         continue;
 733                 }
 734
 735                 /* Only override tables with matching oem id */
 736                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 737                            ACPI_OEM_TABLE_ID_SIZE)) {
 738                         acpi_os_unmap_memory(table,
 739                                      ACPI_HEADER_SIZE);
 740                         continue;
 741                 }
 742
 743                 table_offset -= table->length;
 744                 *table_length = table->length;
 745                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 746                 *address = acpi_tables_addr + table_offset;
 747                 break;
 748         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 749
 750         if (*address != 0)
 751                 acpi_table_taint(existing_table);
 752         return AE_OK;
 753 #endif
 754 }
 755
 756 static irqreturn_t acpi_irq(int irq, void *dev_id)
 757 {
 758         u32 handled;
 759
 760         handled = (*acpi_irq_handler) (acpi_irq_context);
 761
 762         if (handled) {
 763                 acpi_irq_handled++;
 764                 return IRQ_HANDLED;
 765         } else {
 766                 acpi_irq_not_handled++;
 767                 return IRQ_NONE;
 768         }
 769 }
 770
 771 acpi_status
 772 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 773                                   void *context)
 774 {
 775         unsigned int irq;
 776
 777         acpi_irq_stats_init();
 778
 779         /*
 780          * ACPI interrupts different from the SCI in our copy of the FADT are
 781          * not supported.
 782          */
 783         if (gsi != acpi_gbl_FADT.sci_interrupt)
 784                 return AE_BAD_PARAMETER;
 785
 786         if (acpi_irq_handler)
 787                 return AE_ALREADY_ACQUIRED;
 788
 789         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 790                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 791                        gsi);
 792                 return AE_OK;
 793         }
 794
 795         acpi_irq_handler = handler;
 796         acpi_irq_context = context;
 797         if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
 798                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 799                 acpi_irq_handler = NULL;
 800                 return AE_NOT_ACQUIRED;
 801         }
 802
 803         return AE_OK;
 804 }
 805
 806 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 807 {
 808         if (irq != acpi_gbl_FADT.sci_interrupt)
 809                 return AE_BAD_PARAMETER;
 810
 811         free_irq(irq, acpi_irq);
 812         acpi_irq_handler = NULL;
 813
 814         return AE_OK;
 815 }
 816
 817 /*
 818  * Running in interpreter thread context, safe to sleep
 819  */
 820
 821 void acpi_os_sleep(u64 ms)
 822 {
 823         msleep(ms);
 824 }
 825
 826 void acpi_os_stall(u32 us)
 827 {
 828         while (us) {
 829                 u32 delay = 1000;
 830
 831                 if (delay > us)
 832                         delay = us;
 833                 udelay(delay);
 834                 touch_nmi_watchdog();
 835                 us -= delay;
 836         }
 837 }
 838
 839 /*
 840  * Support ACPI 3.0 AML Timer operand
 841  * Returns 64-bit free-running, monotonically increasing timer
 842  * with 100ns granularity
 843  */
 844 u64 acpi_os_get_timer(void)
 845 {
 846         u64 time_ns = ktime_to_ns(ktime_get());
 847         do_div(time_ns, 100);
 848         return time_ns;
 849 }
 850
 851 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 852 {
 853         u32 dummy;
 854
 855         if (!value)
 856                 value = &dummy;
 857
 858         *value = 0;
 859         if (width <= 8) {
 860                 *(u8 *) value = inb(port);
 861         } else if (width <= 16) {
 862                 *(u16 *) value = inw(port);
 863         } else if (width <= 32) {
 864                 *(u32 *) value = inl(port);
 865         } else {
 866                 BUG();
 867         }
 868
 869         return AE_OK;
 870 }
 871
 872 EXPORT_SYMBOL(acpi_os_read_port);
 873
 874 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 875 {
 876         if (width <= 8) {
 877                 outb(value, port);
 878         } else if (width <= 16) {
 879                 outw(value, port);
 880         } else if (width <= 32) {
 881                 outl(value, port);
 882         } else {
 883                 BUG();
 884         }
 885
 886         return AE_OK;
 887 }
 888
 889 EXPORT_SYMBOL(acpi_os_write_port);
 890
 891 #ifdef readq
 892 static inline u64 read64(const volatile void __iomem *addr)
 893 {
 894         return readq(addr);
 895 }
 896 #else
 897 static inline u64 read64(const volatile void __iomem *addr)
 898 {
 899         u64 l, h;
 900         l = readl(addr);
 901         h = readl(addr+4);
 902         return l | (h << 32);
 903 }
 904 #endif
 905
 906 acpi_status
 907 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 908 {
 909         void __iomem *virt_addr;
 910         unsigned int size = width / 8;
 911         bool unmap = false;
 912         u64 dummy;
 913
 914         rcu_read_lock();
 915         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 916         if (!virt_addr) {
 917                 rcu_read_unlock();
 918                 virt_addr = acpi_os_ioremap(phys_addr, size);
 919                 if (!virt_addr)
 920                         return AE_BAD_ADDRESS;
 921                 unmap = true;
 922         }
 923
 924         if (!value)
 925                 value = &dummy;
 926
 927         switch (width) {
 928         case 8:
 929                 *(u8 *) value = readb(virt_addr);
 930                 break;
 931         case 16:
 932                 *(u16 *) value = readw(virt_addr);
 933                 break;
 934         case 32:
 935                 *(u32 *) value = readl(virt_addr);
 936                 break;
 937         case 64:
 938                 *(u64 *) value = read64(virt_addr);
 939                 break;
 940         default:
 941                 BUG();
 942         }
 943
 944         if (unmap)
 945                 iounmap(virt_addr);
 946         else
 947                 rcu_read_unlock();
 948
 949         return AE_OK;
 950 }
 951
 952 #ifdef writeq
 953 static inline void write64(u64 val, volatile void __iomem *addr)
 954 {
 955         writeq(val, addr);
 956 }
 957 #else
 958 static inline void write64(u64 val, volatile void __iomem *addr)
 959 {
 960         writel(val, addr);
 961         writel(val>>32, addr+4);
 962 }
 963 #endif
 964
 965 acpi_status
 966 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 967 {
 968         void __iomem *virt_addr;
 969         unsigned int size = width / 8;
 970         bool unmap = false;
 971
 972         rcu_read_lock();
 973         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 974         if (!virt_addr) {
 975                 rcu_read_unlock();
 976                 virt_addr = acpi_os_ioremap(phys_addr, size);
 977                 if (!virt_addr)
 978                         return AE_BAD_ADDRESS;
 979                 unmap = true;
 980         }
 981
 982         switch (width) {
 983         case 8:
 984                 writeb(value, virt_addr);
 985                 break;
 986         case 16:
 987                 writew(value, virt_addr);
 988                 break;
 989         case 32:
 990                 writel(value, virt_addr);
 991                 break;
 992         case 64:
 993                 write64(value, virt_addr);
 994                 break;
 995         default:
 996                 BUG();
 997         }
 998
 999         if (unmap)
1000                 iounmap(virt_addr);
1001         else
1002                 rcu_read_unlock();
1003
1004         return AE_OK;
1005 }
1006
1007 acpi_status
1008 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1009                                u64 *value, u32 width)
1010 {
1011         int result, size;
1012         u32 value32;
1013
1014         if (!value)
1015                 return AE_BAD_PARAMETER;
1016
1017         switch (width) {
1018         case 8:
1019                 size = 1;
1020                 break;
1021         case 16:
1022                 size = 2;
1023                 break;
1024         case 32:
1025                 size = 4;
1026                 break;
1027         default:
1028                 return AE_ERROR;
1029         }
1030
1031         result = raw_pci_read(pci_id->segment, pci_id->bus,
1032                                 PCI_DEVFN(pci_id->device, pci_id->function),
1033                                 reg, size, &value32);
1034         *value = value32;
1035
1036         return (result ? AE_ERROR : AE_OK);
1037 }
1038
1039 acpi_status
1040 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1041                                 u64 value, u32 width)
1042 {
1043         int result, size;
1044
1045         switch (width) {
1046         case 8:
1047                 size = 1;
1048                 break;
1049         case 16:
1050                 size = 2;
1051                 break;
1052         case 32:
1053                 size = 4;
1054                 break;
1055         default:
1056                 return AE_ERROR;
1057         }
1058
1059         result = raw_pci_write(pci_id->segment, pci_id->bus,
1060                                 PCI_DEVFN(pci_id->device, pci_id->function),
1061                                 reg, size, value);
1062
1063         return (result ? AE_ERROR : AE_OK);
1064 }
1065
1066 static void acpi_os_execute_deferred(struct work_struct *work)
1067 {
1068         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1069
1070         if (dpc->wait)
1071                 acpi_os_wait_events_complete();
1072
1073         dpc->function(dpc->context);
1074         kfree(dpc);
1075 }
1076
1077 /*******************************************************************************
1078  *
1079  * FUNCTION:    acpi_os_execute
1080  *
1081  * PARAMETERS:  Type               - Type of the callback
1082  *              Function           - Function to be executed
1083  *              Context            - Function parameters
1084  *
1085  * RETURN:      Status
1086  *
1087  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1088  *              immediately executes function on a separate thread.
1089  *
1090  ******************************************************************************/
1091
1092 static acpi_status __acpi_os_execute(acpi_execute_type type,
1093         acpi_osd_exec_callback function, void *context, int hp)
1094 {
1095         acpi_status status = AE_OK;
1096         struct acpi_os_dpc *dpc;
1097         struct workqueue_struct *queue;
1098         int ret;
1099         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1100                           "Scheduling function [%p(%p)] for deferred execution.\n",
1101                           function, context));
1102
1103         /*
1104          * Allocate/initialize DPC structure.  Note that this memory will be
1105          * freed by the callee.  The kernel handles the work_struct list  in a
1106          * way that allows us to also free its memory inside the callee.
1107          * Because we may want to schedule several tasks with different
1108          * parameters we can't use the approach some kernel code uses of
1109          * having a static work_struct.
1110          */
1111
1112         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1113         if (!dpc)
1114                 return AE_NO_MEMORY;
1115
1116         dpc->function = function;
1117         dpc->context = context;
1118
1119         /*
1120          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1121          * because the hotplug code may call driver .remove() functions,
1122          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1123          * to flush these workqueues.
1124          *
1125          * To prevent lockdep from complaining unnecessarily, make sure that
1126          * there is a different static lockdep key for each workqueue by using
1127          * INIT_WORK() for each of them separately.
1128          */
1129         if (hp) {
1130                 queue = kacpi_hotplug_wq;
1131                 dpc->wait = 1;
1132                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1133         } else if (type == OSL_NOTIFY_HANDLER) {
1134                 queue = kacpi_notify_wq;
1135                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1136         } else {
1137                 queue = kacpid_wq;
1138                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1139         }
1140
1141         /*
1142          * On some machines, a software-initiated SMI causes corruption unless
1143          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1144          * typically it's done in GPE-related methods that are run via
1145          * workqueues, so we can avoid the known corruption cases by always
1146          * queueing on CPU 0.
1147          */
1148         ret = queue_work_on(0, queue, &dpc->work);
1149
1150         if (!ret) {
1151                 printk(KERN_ERR PREFIX
1152                           "Call to queue_work() failed.\n");
1153                 status = AE_ERROR;
1154                 kfree(dpc);
1155         }
1156         return status;
1157 }
1158
1159 acpi_status acpi_os_execute(acpi_execute_type type,
1160                             acpi_osd_exec_callback function, void *context)
1161 {
1162         return __acpi_os_execute(type, function, context, 0);
1163 }
1164 EXPORT_SYMBOL(acpi_os_execute);
1165
1166 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1167         void *context)
1168 {
1169         return __acpi_os_execute(0, function, context, 1);
1170 }
1171 EXPORT_SYMBOL(acpi_os_hotplug_execute);
1172
1173 void acpi_os_wait_events_complete(void)
1174 {
1175         flush_workqueue(kacpid_wq);
1176         flush_workqueue(kacpi_notify_wq);
1177 }
1178
1179 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1180
1181 acpi_status
1182 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1183 {
1184         struct semaphore *sem = NULL;
1185
1186         sem = acpi_os_allocate(sizeof(struct semaphore));
1187         if (!sem)
1188                 return AE_NO_MEMORY;
1189         memset(sem, 0, sizeof(struct semaphore));
1190
1191         sema_init(sem, initial_units);
1192
1193         *handle = (acpi_handle *) sem;
1194
1195         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1196                           *handle, initial_units));
1197
1198         return AE_OK;
1199 }
1200
1201 /*
1202  * TODO: A better way to delete semaphores?  Linux doesn't have a
1203  * 'delete_semaphore()' function -- may result in an invalid
1204  * pointer dereference for non-synchronized consumers.  Should
1205  * we at least check for blocked threads and signal/cancel them?
1206  */
1207
1208 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1209 {
1210         struct semaphore *sem = (struct semaphore *)handle;
1211
1212         if (!sem)
1213                 return AE_BAD_PARAMETER;
1214
1215         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1216
1217         BUG_ON(!list_empty(&sem->wait_list));
1218         kfree(sem);
1219         sem = NULL;
1220
1221         return AE_OK;
1222 }
1223
1224 /*
1225  * TODO: Support for units > 1?
1226  */
1227 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1228 {
1229         acpi_status status = AE_OK;
1230         struct semaphore *sem = (struct semaphore *)handle;
1231         long jiffies;
1232         int ret = 0;
1233
1234         if (!sem || (units < 1))
1235                 return AE_BAD_PARAMETER;
1236
1237         if (units > 1)
1238                 return AE_SUPPORT;
1239
1240         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1241                           handle, units, timeout));
1242
1243         if (timeout == ACPI_WAIT_FOREVER)
1244                 jiffies = MAX_SCHEDULE_TIMEOUT;
1245         else
1246                 jiffies = msecs_to_jiffies(timeout);
1247
1248         ret = down_timeout(sem, jiffies);
1249         if (ret)
1250                 status = AE_TIME;
1251
1252         if (ACPI_FAILURE(status)) {
1253                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1254                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1255                                   handle, units, timeout,
1256                                   acpi_format_exception(status)));
1257         } else {
1258                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1259                                   "Acquired semaphore[%p|%d|%d]", handle,
1260                                   units, timeout));
1261         }
1262
1263         return status;
1264 }
1265
1266 /*
1267  * TODO: Support for units > 1?
1268  */
1269 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1270 {
1271         struct semaphore *sem = (struct semaphore *)handle;
1272
1273         if (!sem || (units < 1))
1274                 return AE_BAD_PARAMETER;
1275
1276         if (units > 1)
1277                 return AE_SUPPORT;
1278
1279         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1280                           units));
1281
1282         up(sem);
1283
1284         return AE_OK;
1285 }
1286
1287 #ifdef ACPI_FUTURE_USAGE
1288 u32 acpi_os_get_line(char *buffer)
1289 {
1290
1291 #ifdef ENABLE_DEBUGGER
1292         if (acpi_in_debugger) {
1293                 u32 chars;
1294
1295                 kdb_read(buffer, sizeof(line_buf));
1296
1297                 /* remove the CR kdb includes */
1298                 chars = strlen(buffer) - 1;
1299                 buffer[chars] = '\0';
1300         }
1301 #endif
1302
1303         return 0;
1304 }
1305 #endif                          /*  ACPI_FUTURE_USAGE  */
1306
1307 acpi_status acpi_os_signal(u32 function, void *info)
1308 {
1309         switch (function) {
1310         case ACPI_SIGNAL_FATAL:
1311                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1312                 break;
1313         case ACPI_SIGNAL_BREAKPOINT:
1314                 /*
1315                  * AML Breakpoint
1316                  * ACPI spec. says to treat it as a NOP unless
1317                  * you are debugging.  So if/when we integrate
1318                  * AML debugger into the kernel debugger its
1319                  * hook will go here.  But until then it is
1320                  * not useful to print anything on breakpoints.
1321                  */
1322                 break;
1323         default:
1324                 break;
1325         }
1326
1327         return AE_OK;
1328 }
1329
1330 static int __init acpi_os_name_setup(char *str)
1331 {
1332         char *p = acpi_os_name;
1333         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1334
1335         if (!str || !*str)
1336                 return 0;
1337
1338         for (; count-- && str && *str; str++) {
1339                 if (isalnum(*str) || *str == ' ' || *str == ':')
1340                         *p++ = *str;
1341                 else if (*str == '\'' || *str == '"')
1342                         continue;
1343                 else
1344                         break;
1345         }
1346         *p = 0;
1347
1348         return 1;
1349
1350 }
1351
1352 __setup("acpi_os_name=", acpi_os_name_setup);
1353
1354 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1355 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1356
1357 struct osi_setup_entry {
1358         char string[OSI_STRING_LENGTH_MAX];
1359         bool enable;
1360 };
1361
1362 static struct osi_setup_entry
1363                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1364         {"Module Device", true},
1365         {"Processor Device", true},
1366         {"3.0 _SCP Extensions", true},
1367         {"Processor Aggregator Device", true},
1368 };
1369
1370 void __init acpi_osi_setup(char *str)
1371 {
1372         struct osi_setup_entry *osi;
1373         bool enable = true;
1374         int i;
1375
1376         if (!acpi_gbl_create_osi_method)
1377                 return;
1378
1379         if (str == NULL || *str == '\0') {
1380                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1381                 acpi_gbl_create_osi_method = FALSE;
1382                 return;
1383         }
1384
1385         if (*str == '!') {
1386                 str++;
1387                 if (*str == '\0') {
1388                         osi_linux.default_disabling = 1;
1389                         return;
1390                 } else if (*str == '*') {
1391                         acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1392                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1393                                 osi = &osi_setup_entries[i];
1394                                 osi->enable = false;
1395                         }
1396                         return;
1397                 }
1398                 enable = false;
1399         }
1400
1401         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1402                 osi = &osi_setup_entries[i];
1403                 if (!strcmp(osi->string, str)) {
1404                         osi->enable = enable;
1405                         break;
1406                 } else if (osi->string[0] == '\0') {
1407                         osi->enable = enable;
1408                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1409                         break;
1410                 }
1411         }
1412 }
1413
1414 static void __init set_osi_linux(unsigned int enable)
1415 {
1416         if (osi_linux.enable != enable)
1417                 osi_linux.enable = enable;
1418
1419         if (osi_linux.enable)
1420                 acpi_osi_setup("Linux");
1421         else
1422                 acpi_osi_setup("!Linux");
1423
1424         return;
1425 }
1426
1427 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1428 {
1429         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1430         osi_linux.dmi = 0;
1431         set_osi_linux(enable);
1432
1433         return;
1434 }
1435
1436 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1437 {
1438         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1439
1440         if (enable == -1)
1441                 return;
1442
1443         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1444         set_osi_linux(enable);
1445
1446         return;
1447 }
1448
1449 /*
1450  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1451  *
1452  * empty string disables _OSI
1453  * string starting with '!' disables that string
1454  * otherwise string is added to list, augmenting built-in strings
1455  */
1456 static void __init acpi_osi_setup_late(void)
1457 {
1458         struct osi_setup_entry *osi;
1459         char *str;
1460         int i;
1461         acpi_status status;
1462
1463         if (osi_linux.default_disabling) {
1464                 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1465
1466                 if (ACPI_SUCCESS(status))
1467                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1468         }
1469
1470         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1471                 osi = &osi_setup_entries[i];
1472                 str = osi->string;
1473
1474                 if (*str == '\0')
1475                         break;
1476                 if (osi->enable) {
1477                         status = acpi_install_interface(str);
1478
1479                         if (ACPI_SUCCESS(status))
1480                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1481                 } else {
1482                         status = acpi_remove_interface(str);
1483
1484                         if (ACPI_SUCCESS(status))
1485                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1486                 }
1487         }
1488 }
1489
1490 static int __init osi_setup(char *str)
1491 {
1492         if (str && !strcmp("Linux", str))
1493                 acpi_cmdline_osi_linux(1);
1494         else if (str && !strcmp("!Linux", str))
1495                 acpi_cmdline_osi_linux(0);
1496         else
1497                 acpi_osi_setup(str);
1498
1499         return 1;
1500 }
1501
1502 __setup("acpi_osi=", osi_setup);
1503
1504 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1505 static int __init acpi_serialize_setup(char *str)
1506 {
1507         printk(KERN_INFO PREFIX "serialize enabled\n");
1508
1509         acpi_gbl_all_methods_serialized = TRUE;
1510
1511         return 1;
1512 }
1513
1514 __setup("acpi_serialize", acpi_serialize_setup);
1515
1516 /* Check of resource interference between native drivers and ACPI
1517  * OperationRegions (SystemIO and System Memory only).
1518  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1519  * in arbitrary AML code and can interfere with legacy drivers.
1520  * acpi_enforce_resources= can be set to:
1521  *
1522  *   - strict (default) (2)
1523  *     -> further driver trying to access the resources will not load
1524  *   - lax              (1)
1525  *     -> further driver trying to access the resources will load, but you
1526  *     get a system message that something might go wrong...
1527  *
1528  *   - no               (0)
1529  *     -> ACPI Operation Region resources will not be registered
1530  *
1531  */
1532 #define ENFORCE_RESOURCES_STRICT 2
1533 #define ENFORCE_RESOURCES_LAX    1
1534 #define ENFORCE_RESOURCES_NO     0
1535
1536 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1537
1538 static int __init acpi_enforce_resources_setup(char *str)
1539 {
1540         if (str == NULL || *str == '\0')
1541                 return 0;
1542
1543         if (!strcmp("strict", str))
1544                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1545         else if (!strcmp("lax", str))
1546                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1547         else if (!strcmp("no", str))
1548                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1549
1550         return 1;
1551 }
1552
1553 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1554
1555 /* Check for resource conflicts between ACPI OperationRegions and native
1556  * drivers */
1557 int acpi_check_resource_conflict(const struct resource *res)
1558 {
1559         acpi_adr_space_type space_id;
1560         acpi_size length;
1561         u8 warn = 0;
1562         int clash = 0;
1563
1564         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1565                 return 0;
1566         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1567                 return 0;
1568
1569         if (res->flags & IORESOURCE_IO)
1570                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1571         else
1572                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1573
1574         length = resource_size(res);
1575         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1576                 warn = 1;
1577         clash = acpi_check_address_range(space_id, res->start, length, warn);
1578
1579         if (clash) {
1580                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1581                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1582                                 printk(KERN_NOTICE "ACPI: This conflict may"
1583                                        " cause random problems and system"
1584                                        " instability\n");
1585                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1586                                " for this device, you should use it instead of"
1587                                " the native driver\n");
1588                 }
1589                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1590                         return -EBUSY;
1591         }
1592         return 0;
1593 }
1594 EXPORT_SYMBOL(acpi_check_resource_conflict);
1595
1596 int acpi_check_region(resource_size_t start, resource_size_t n,
1597                       const char *name)
1598 {
1599         struct resource res = {
1600                 .start = start,
1601                 .end   = start + n - 1,
1602                 .name  = name,
1603                 .flags = IORESOURCE_IO,
1604         };
1605
1606         return acpi_check_resource_conflict(&res);
1607 }
1608 EXPORT_SYMBOL(acpi_check_region);
1609
1610 /*
1611  * Let drivers know whether the resource checks are effective
1612  */
1613 int acpi_resources_are_enforced(void)
1614 {
1615         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1616 }
1617 EXPORT_SYMBOL(acpi_resources_are_enforced);
1618
1619 /*
1620  * Deallocate the memory for a spinlock.
1621  */
1622 void acpi_os_delete_lock(acpi_spinlock handle)
1623 {
1624         ACPI_FREE(handle);
1625 }
1626
1627 /*
1628  * Acquire a spinlock.
1629  *
1630  * handle is a pointer to the spinlock_t.
1631  */
1632
1633 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1634 {
1635         acpi_cpu_flags flags;
1636         spin_lock_irqsave(lockp, flags);
1637         return flags;
1638 }
1639
1640 /*
1641  * Release a spinlock. See above.
1642  */
1643
1644 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1645 {
1646         spin_unlock_irqrestore(lockp, flags);
1647 }
1648
1649 #ifndef ACPI_USE_LOCAL_CACHE
1650
1651 /*******************************************************************************
1652  *
1653  * FUNCTION:    acpi_os_create_cache
1654  *
1655  * PARAMETERS:  name      - Ascii name for the cache
1656  *              size      - Size of each cached object
1657  *              depth     - Maximum depth of the cache (in objects) <ignored>
1658  *              cache     - Where the new cache object is returned
1659  *
1660  * RETURN:      status
1661  *
1662  * DESCRIPTION: Create a cache object
1663  *
1664  ******************************************************************************/
1665
1666 acpi_status
1667 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1668 {
1669         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1670         if (*cache == NULL)
1671                 return AE_ERROR;
1672         else
1673                 return AE_OK;
1674 }
1675
1676 /*******************************************************************************
1677  *
1678  * FUNCTION:    acpi_os_purge_cache
1679  *
1680  * PARAMETERS:  Cache           - Handle to cache object
1681  *
1682  * RETURN:      Status
1683  *
1684  * DESCRIPTION: Free all objects within the requested cache.
1685  *
1686  ******************************************************************************/
1687
1688 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1689 {
1690         kmem_cache_shrink(cache);
1691         return (AE_OK);
1692 }
1693
1694 /*******************************************************************************
1695  *
1696  * FUNCTION:    acpi_os_delete_cache
1697  *
1698  * PARAMETERS:  Cache           - Handle to cache object
1699  *
1700  * RETURN:      Status
1701  *
1702  * DESCRIPTION: Free all objects within the requested cache and delete the
1703  *              cache object.
1704  *
1705  ******************************************************************************/
1706
1707 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1708 {
1709         kmem_cache_destroy(cache);
1710         return (AE_OK);
1711 }
1712
1713 /*******************************************************************************
1714  *
1715  * FUNCTION:    acpi_os_release_object
1716  *
1717  * PARAMETERS:  Cache       - Handle to cache object
1718  *              Object      - The object to be released
1719  *
1720  * RETURN:      None
1721  *
1722  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1723  *              the object is deleted.
1724  *
1725  ******************************************************************************/
1726
1727 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1728 {
1729         kmem_cache_free(cache, object);
1730         return (AE_OK);
1731 }
1732 #endif
1733
1734 static int __init acpi_no_auto_ssdt_setup(char *s)
1735 {
1736         printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n");
1737
1738         acpi_gbl_disable_ssdt_table_load = TRUE;
1739
1740         return 1;
1741 }
1742
1743 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
1744
1745 acpi_status __init acpi_os_initialize(void)
1746 {
1747         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1748         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1749         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1750         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1751
1752         return AE_OK;
1753 }
1754
1755 acpi_status __init acpi_os_initialize1(void)
1756 {
1757         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1758         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1759         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1760         BUG_ON(!kacpid_wq);
1761         BUG_ON(!kacpi_notify_wq);
1762         BUG_ON(!kacpi_hotplug_wq);
1763         acpi_install_interface_handler(acpi_osi_handler);
1764         acpi_osi_setup_late();
1765         return AE_OK;
1766 }
1767
1768 acpi_status acpi_os_terminate(void)
1769 {
1770         if (acpi_irq_handler) {
1771                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1772                                                  acpi_irq_handler);
1773         }
1774
1775         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1776         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1777         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1778         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1779
1780         destroy_workqueue(kacpid_wq);
1781         destroy_workqueue(kacpi_notify_wq);
1782         destroy_workqueue(kacpi_hotplug_wq);
1783
1784         return AE_OK;
1785 }
1786
1787 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1788                                   u32 pm1b_control)
1789 {
1790         int rc = 0;
1791         if (__acpi_os_prepare_sleep)
1792                 rc = __acpi_os_prepare_sleep(sleep_state,
1793                                              pm1a_control, pm1b_control);
1794         if (rc < 0)
1795                 return AE_ERROR;
1796         else if (rc > 0)
1797                 return AE_CTRL_SKIP;
1798
1799         return AE_OK;
1800 }
1801
1802 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1803                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1804 {
1805         __acpi_os_prepare_sleep = func;
1806 }
1807
1808 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1809                                   u32 val_b)
1810 {
1811         int rc = 0;
1812         if (__acpi_os_prepare_extended_sleep)
1813                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1814                                              val_a, val_b);
1815         if (rc < 0)
1816                 return AE_ERROR;
1817         else if (rc > 0)
1818                 return AE_CTRL_SKIP;
1819
1820         return AE_OK;
1821 }
1822
1823 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1824                                u32 val_a, u32 val_b))
1825 {
1826         __acpi_os_prepare_extended_sleep = func;
1827 }
1828
1829
1830 void alloc_acpi_hp_work(acpi_handle handle, u32 type, void *context,
1831                         void (*func)(struct work_struct *work))
1832 {
1833         struct acpi_hp_work *hp_work;
1834         int ret;
1835
1836         hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1837         if (!hp_work)
1838                 return;
1839
1840         hp_work->handle = handle;
1841         hp_work->type = type;
1842         hp_work->context = context;
1843
1844         INIT_WORK(&hp_work->work, func);
1845         ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1846         if (!ret)
1847                 kfree(hp_work);
1848 }
1849 EXPORT_SYMBOL_GPL(alloc_acpi_hp_work);