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 static struct workqueue_struct *kacpi_hotplug_wq;
  88
  89 /*
  90  * This list of permanent mappings is for memory that may be accessed from
  91  * interrupt context, where we can't do the ioremap().
  92  */
  93 struct acpi_ioremap {
  94         struct list_head list;
  95         void __iomem *virt;
  96         acpi_physical_address phys;
  97         acpi_size size;
  98         unsigned long refcount;
  99 };
 100
 101 static LIST_HEAD(acpi_ioremaps);
 102 static DEFINE_MUTEX(acpi_ioremap_lock);
 103
 104 static void __init acpi_osi_setup_late(void);
 105
 106 /*
 107  * The story of _OSI(Linux)
 108  *
 109  * From pre-history through Linux-2.6.22,
 110  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 111  *
 112  * Unfortunately, reference BIOS writers got wind of this
 113  * and put OSI(Linux) in their example code, quickly exposing
 114  * this string as ill-conceived and opening the door to
 115  * an un-bounded number of BIOS incompatibilities.
 116  *
 117  * For example, OSI(Linux) was used on resume to re-POST a
 118  * video card on one system, because Linux at that time
 119  * could not do a speedy restore in its native driver.
 120  * But then upon gaining quick native restore capability,
 121  * Linux has no way to tell the BIOS to skip the time-consuming
 122  * POST -- putting Linux at a permanent performance disadvantage.
 123  * On another system, the BIOS writer used OSI(Linux)
 124  * to infer native OS support for IPMI!  On other systems,
 125  * OSI(Linux) simply got in the way of Linux claiming to
 126  * be compatible with other operating systems, exposing
 127  * BIOS issues such as skipped device initialization.
 128  *
 129  * So "Linux" turned out to be a really poor chose of
 130  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 131  *
 132  * BIOS writers should NOT query _OSI(Linux) on future systems.
 133  * Linux will complain on the console when it sees it, and return FALSE.
 134  * To get Linux to return TRUE for your system  will require
 135  * a kernel source update to add a DMI entry,
 136  * or boot with "acpi_osi=Linux"
 137  */
 138
 139 static struct osi_linux {
 140         unsigned int    enable:1;
 141         unsigned int    dmi:1;
 142         unsigned int    cmdline:1;
 143 } osi_linux = {0, 0, 0};
 144
 145 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 146 {
 147         if (!strcmp("Linux", interface)) {
 148
 149                 printk_once(KERN_NOTICE FW_BUG PREFIX
 150                         "BIOS _OSI(Linux) query %s%s\n",
 151                         osi_linux.enable ? "honored" : "ignored",
 152                         osi_linux.cmdline ? " via cmdline" :
 153                         osi_linux.dmi ? " via DMI" : "");
 154         }
 155
 156         return supported;
 157 }
 158
 159 static void __init acpi_request_region (struct acpi_generic_address *gas,
 160         unsigned int length, char *desc)
 161 {
 162         u64 addr;
 163
 164         /* Handle possible alignment issues */
 165         memcpy(&addr, &gas->address, sizeof(addr));
 166         if (!addr || !length)
 167                 return;
 168
 169         /* Resources are never freed */
 170         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 171                 request_region(addr, length, desc);
 172         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 173                 request_mem_region(addr, length, desc);
 174 }
 175
 176 static void __init acpi_reserve_resources(void)
 177 {
 178         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 179                 "ACPI PM1a_EVT_BLK");
 180
 181         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 182                 "ACPI PM1b_EVT_BLK");
 183
 184         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 185                 "ACPI PM1a_CNT_BLK");
 186
 187         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 188                 "ACPI PM1b_CNT_BLK");
 189
 190         if (acpi_gbl_FADT.pm_timer_length == 4)
 191                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 192
 193         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 194                 "ACPI PM2_CNT_BLK");
 195
 196         /* Length of GPE blocks must be a non-negative multiple of 2 */
 197
 198         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 199                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 200                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 201
 202         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 203                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 204                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 205 }
 206
 207 void acpi_os_printf(const char *fmt, ...)
 208 {
 209         va_list args;
 210         va_start(args, fmt);
 211         acpi_os_vprintf(fmt, args);
 212         va_end(args);
 213 }
 214
 215 void acpi_os_vprintf(const char *fmt, va_list args)
 216 {
 217         static char buffer[512];
 218
 219         vsprintf(buffer, fmt, args);
 220
 221 #ifdef ENABLE_DEBUGGER
 222         if (acpi_in_debugger) {
 223                 kdb_printf("%s", buffer);
 224         } else {
 225                 printk(KERN_CONT "%s", buffer);
 226         }
 227 #else
 228         printk(KERN_CONT "%s", buffer);
 229 #endif
 230 }
 231
 232 #ifdef CONFIG_KEXEC
 233 static unsigned long acpi_rsdp;
 234 static int __init setup_acpi_rsdp(char *arg)
 235 {
 236         acpi_rsdp = simple_strtoul(arg, NULL, 16);
 237         return 0;
 238 }
 239 early_param("acpi_rsdp", setup_acpi_rsdp);
 240 #endif
 241
 242 acpi_physical_address __init acpi_os_get_root_pointer(void)
 243 {
 244 #ifdef CONFIG_KEXEC
 245         if (acpi_rsdp)
 246                 return acpi_rsdp;
 247 #endif
 248
 249         if (efi_enabled(EFI_CONFIG_TABLES)) {
 250                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 251                         return efi.acpi20;
 252                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 253                         return efi.acpi;
 254                 else {
 255                         printk(KERN_ERR PREFIX
 256                                "System description tables not found\n");
 257                         return 0;
 258                 }
 259         } else {
 260                 acpi_physical_address pa = 0;
 261
 262                 acpi_find_root_pointer(&pa);
 263                 return pa;
 264         }
 265 }
 266
 267 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 268 static struct acpi_ioremap *
 269 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 270 {
 271         struct acpi_ioremap *map;
 272
 273         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 274                 if (map->phys <= phys &&
 275                     phys + size <= map->phys + map->size)
 276                         return map;
 277
 278         return NULL;
 279 }
 280
 281 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 282 static void __iomem *
 283 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 284 {
 285         struct acpi_ioremap *map;
 286
 287         map = acpi_map_lookup(phys, size);
 288         if (map)
 289                 return map->virt + (phys - map->phys);
 290
 291         return NULL;
 292 }
 293
 294 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 295 {
 296         struct acpi_ioremap *map;
 297         void __iomem *virt = NULL;
 298
 299         mutex_lock(&acpi_ioremap_lock);
 300         map = acpi_map_lookup(phys, size);
 301         if (map) {
 302                 virt = map->virt + (phys - map->phys);
 303                 map->refcount++;
 304         }
 305         mutex_unlock(&acpi_ioremap_lock);
 306         return virt;
 307 }
 308 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 309
 310 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 311 static struct acpi_ioremap *
 312 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 313 {
 314         struct acpi_ioremap *map;
 315
 316         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 317                 if (map->virt <= virt &&
 318                     virt + size <= map->virt + map->size)
 319                         return map;
 320
 321         return NULL;
 322 }
 323
 324 #ifndef CONFIG_IA64
 325 #define should_use_kmap(pfn)   page_is_ram(pfn)
 326 #else
 327 /* ioremap will take care of cache attributes */
 328 #define should_use_kmap(pfn)   0
 329 #endif
 330
 331 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 332 {
 333         unsigned long pfn;
 334
 335         pfn = pg_off >> PAGE_SHIFT;
 336         if (should_use_kmap(pfn)) {
 337                 if (pg_sz > PAGE_SIZE)
 338                         return NULL;
 339                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 340         } else
 341                 return acpi_os_ioremap(pg_off, pg_sz);
 342 }
 343
 344 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 345 {
 346         unsigned long pfn;
 347
 348         pfn = pg_off >> PAGE_SHIFT;
 349         if (should_use_kmap(pfn))
 350                 kunmap(pfn_to_page(pfn));
 351         else
 352                 iounmap(vaddr);
 353 }
 354
 355 void __iomem *__init_refok
 356 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 357 {
 358         struct acpi_ioremap *map;
 359         void __iomem *virt;
 360         acpi_physical_address pg_off;
 361         acpi_size pg_sz;
 362
 363         if (phys > ULONG_MAX) {
 364                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 365                 return NULL;
 366         }
 367
 368         if (!acpi_gbl_permanent_mmap)
 369                 return __acpi_map_table((unsigned long)phys, size);
 370
 371         mutex_lock(&acpi_ioremap_lock);
 372         /* Check if there's a suitable mapping already. */
 373         map = acpi_map_lookup(phys, size);
 374         if (map) {
 375                 map->refcount++;
 376                 goto out;
 377         }
 378
 379         map = kzalloc(sizeof(*map), GFP_KERNEL);
 380         if (!map) {
 381                 mutex_unlock(&acpi_ioremap_lock);
 382                 return NULL;
 383         }
 384
 385         pg_off = round_down(phys, PAGE_SIZE);
 386         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 387         virt = acpi_map(pg_off, pg_sz);
 388         if (!virt) {
 389                 mutex_unlock(&acpi_ioremap_lock);
 390                 kfree(map);
 391                 return NULL;
 392         }
 393
 394         INIT_LIST_HEAD(&map->list);
 395         map->virt = virt;
 396         map->phys = pg_off;
 397         map->size = pg_sz;
 398         map->refcount = 1;
 399
 400         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 401
 402  out:
 403         mutex_unlock(&acpi_ioremap_lock);
 404         return map->virt + (phys - map->phys);
 405 }
 406 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 407
 408 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 409 {
 410         if (!--map->refcount)
 411                 list_del_rcu(&map->list);
 412 }
 413
 414 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 415 {
 416         if (!map->refcount) {
 417                 synchronize_rcu();
 418                 acpi_unmap(map->phys, map->virt);
 419                 kfree(map);
 420         }
 421 }
 422
 423 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 424 {
 425         struct acpi_ioremap *map;
 426
 427         if (!acpi_gbl_permanent_mmap) {
 428                 __acpi_unmap_table(virt, size);
 429                 return;
 430         }
 431
 432         mutex_lock(&acpi_ioremap_lock);
 433         map = acpi_map_lookup_virt(virt, size);
 434         if (!map) {
 435                 mutex_unlock(&acpi_ioremap_lock);
 436                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 437                 return;
 438         }
 439         acpi_os_drop_map_ref(map);
 440         mutex_unlock(&acpi_ioremap_lock);
 441
 442         acpi_os_map_cleanup(map);
 443 }
 444 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 445
 446 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 447 {
 448         if (!acpi_gbl_permanent_mmap)
 449                 __acpi_unmap_table(virt, size);
 450 }
 451
 452 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 453 {
 454         u64 addr;
 455         void __iomem *virt;
 456
 457         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 458                 return 0;
 459
 460         /* Handle possible alignment issues */
 461         memcpy(&addr, &gas->address, sizeof(addr));
 462         if (!addr || !gas->bit_width)
 463                 return -EINVAL;
 464
 465         virt = acpi_os_map_memory(addr, gas->bit_width / 8);
 466         if (!virt)
 467                 return -EIO;
 468
 469         return 0;
 470 }
 471 EXPORT_SYMBOL(acpi_os_map_generic_address);
 472
 473 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 474 {
 475         u64 addr;
 476         struct acpi_ioremap *map;
 477
 478         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 479                 return;
 480
 481         /* Handle possible alignment issues */
 482         memcpy(&addr, &gas->address, sizeof(addr));
 483         if (!addr || !gas->bit_width)
 484                 return;
 485
 486         mutex_lock(&acpi_ioremap_lock);
 487         map = acpi_map_lookup(addr, gas->bit_width / 8);
 488         if (!map) {
 489                 mutex_unlock(&acpi_ioremap_lock);
 490                 return;
 491         }
 492         acpi_os_drop_map_ref(map);
 493         mutex_unlock(&acpi_ioremap_lock);
 494
 495         acpi_os_map_cleanup(map);
 496 }
 497 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 498
 499 #ifdef ACPI_FUTURE_USAGE
 500 acpi_status
 501 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 502 {
 503         if (!phys || !virt)
 504                 return AE_BAD_PARAMETER;
 505
 506         *phys = virt_to_phys(virt);
 507
 508         return AE_OK;
 509 }
 510 #endif
 511
 512 #define ACPI_MAX_OVERRIDE_LEN 100
 513
 514 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 515
 516 acpi_status
 517 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 518                             acpi_string * new_val)
 519 {
 520         if (!init_val || !new_val)
 521                 return AE_BAD_PARAMETER;
 522
 523         *new_val = NULL;
 524         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 525                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 526                        acpi_os_name);
 527                 *new_val = acpi_os_name;
 528         }
 529
 530         return AE_OK;
 531 }
 532
 533 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 534 #include <linux/earlycpio.h>
 535 #include <linux/memblock.h>
 536
 537 static u64 acpi_tables_addr;
 538 static int all_tables_size;
 539
 540 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 541 u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 542 {
 543         u8 sum = 0;
 544         u8 *end = buffer + length;
 545
 546         while (buffer < end)
 547                 sum = (u8) (sum + *(buffer++));
 548         return sum;
 549 }
 550
 551 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 552 static const char * const table_sigs[] = {
 553         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 554         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 555         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 556         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 557         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 558         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 559         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 560         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 561         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 562
 563 /* Non-fatal errors: Affected tables/files are ignored */
 564 #define INVALID_TABLE(x, path, name)                                    \
 565         { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); continue; }
 566
 567 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 568
 569 /* Must not increase 10 or needs code modification below */
 570 #define ACPI_OVERRIDE_TABLES 10
 571
 572 void __init acpi_initrd_override(void *data, size_t size)
 573 {
 574         int sig, no, table_nr = 0, total_offset = 0;
 575         long offset = 0;
 576         struct acpi_table_header *table;
 577         char cpio_path[32] = "kernel/firmware/acpi/";
 578         struct cpio_data file;
 579         struct cpio_data early_initrd_files[ACPI_OVERRIDE_TABLES];
 580         char *p;
 581
 582         if (data == NULL || size == 0)
 583                 return;
 584
 585         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 586                 file = find_cpio_data(cpio_path, data, size, &offset);
 587                 if (!file.data)
 588                         break;
 589
 590                 data += offset;
 591                 size -= offset;
 592
 593                 if (file.size < sizeof(struct acpi_table_header))
 594                         INVALID_TABLE("Table smaller than ACPI header",
 595                                       cpio_path, file.name);
 596
 597                 table = file.data;
 598
 599                 for (sig = 0; table_sigs[sig]; sig++)
 600                         if (!memcmp(table->signature, table_sigs[sig], 4))
 601                                 break;
 602
 603                 if (!table_sigs[sig])
 604                         INVALID_TABLE("Unknown signature",
 605                                       cpio_path, file.name);
 606                 if (file.size != table->length)
 607                         INVALID_TABLE("File length does not match table length",
 608                                       cpio_path, file.name);
 609                 if (acpi_table_checksum(file.data, table->length))
 610                         INVALID_TABLE("Bad table checksum",
 611                                       cpio_path, file.name);
 612
 613                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 614                         table->signature, cpio_path, file.name, table->length);
 615
 616                 all_tables_size += table->length;
 617                 early_initrd_files[table_nr].data = file.data;
 618                 early_initrd_files[table_nr].size = file.size;
 619                 table_nr++;
 620         }
 621         if (table_nr == 0)
 622                 return;
 623
 624         acpi_tables_addr =
 625                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 626                                        all_tables_size, PAGE_SIZE);
 627         if (!acpi_tables_addr) {
 628                 WARN_ON(1);
 629                 return;
 630         }
 631         /*
 632          * Only calling e820_add_reserve does not work and the
 633          * tables are invalid (memory got used) later.
 634          * memblock_reserve works as expected and the tables won't get modified.
 635          * But it's not enough on X86 because ioremap will
 636          * complain later (used by acpi_os_map_memory) that the pages
 637          * that should get mapped are not marked "reserved".
 638          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 639          * works fine.
 640          */
 641         memblock_reserve(acpi_tables_addr, all_tables_size);
 642         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 643
 644         p = early_ioremap(acpi_tables_addr, all_tables_size);
 645
 646         for (no = 0; no < table_nr; no++) {
 647                 memcpy(p + total_offset, early_initrd_files[no].data,
 648                        early_initrd_files[no].size);
 649                 total_offset += early_initrd_files[no].size;
 650         }
 651         early_iounmap(p, all_tables_size);
 652 }
 653 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 654
 655 static void acpi_table_taint(struct acpi_table_header *table)
 656 {
 657         pr_warn(PREFIX
 658                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 659                 table->signature, table->oem_table_id);
 660         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 661 }
 662
 663
 664 acpi_status
 665 acpi_os_table_override(struct acpi_table_header * existing_table,
 666                        struct acpi_table_header ** new_table)
 667 {
 668         if (!existing_table || !new_table)
 669                 return AE_BAD_PARAMETER;
 670
 671         *new_table = NULL;
 672
 673 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 674         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 675                 *new_table = (struct acpi_table_header *)AmlCode;
 676 #endif
 677         if (*new_table != NULL)
 678                 acpi_table_taint(existing_table);
 679         return AE_OK;
 680 }
 681
 682 acpi_status
 683 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 684                                 acpi_physical_address *address,
 685                                 u32 *table_length)
 686 {
 687 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 688         *table_length = 0;
 689         *address = 0;
 690         return AE_OK;
 691 #else
 692         int table_offset = 0;
 693         struct acpi_table_header *table;
 694
 695         *table_length = 0;
 696         *address = 0;
 697
 698         if (!acpi_tables_addr)
 699                 return AE_OK;
 700
 701         do {
 702                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 703                         WARN_ON(1);
 704                         return AE_OK;
 705                 }
 706
 707                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 708                                            ACPI_HEADER_SIZE);
 709
 710                 if (table_offset + table->length > all_tables_size) {
 711                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 712                         WARN_ON(1);
 713                         return AE_OK;
 714                 }
 715
 716                 table_offset += table->length;
 717
 718                 if (memcmp(existing_table->signature, table->signature, 4)) {
 719                         acpi_os_unmap_memory(table,
 720                                      ACPI_HEADER_SIZE);
 721                         continue;
 722                 }
 723
 724                 /* Only override tables with matching oem id */
 725                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 726                            ACPI_OEM_TABLE_ID_SIZE)) {
 727                         acpi_os_unmap_memory(table,
 728                                      ACPI_HEADER_SIZE);
 729                         continue;
 730                 }
 731
 732                 table_offset -= table->length;
 733                 *table_length = table->length;
 734                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 735                 *address = acpi_tables_addr + table_offset;
 736                 break;
 737         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 738
 739         if (*address != 0)
 740                 acpi_table_taint(existing_table);
 741         return AE_OK;
 742 #endif
 743 }
 744
 745 static irqreturn_t acpi_irq(int irq, void *dev_id)
 746 {
 747         u32 handled;
 748
 749         handled = (*acpi_irq_handler) (acpi_irq_context);
 750
 751         if (handled) {
 752                 acpi_irq_handled++;
 753                 return IRQ_HANDLED;
 754         } else {
 755                 acpi_irq_not_handled++;
 756                 return IRQ_NONE;
 757         }
 758 }
 759
 760 acpi_status
 761 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 762                                   void *context)
 763 {
 764         unsigned int irq;
 765
 766         acpi_irq_stats_init();
 767
 768         /*
 769          * ACPI interrupts different from the SCI in our copy of the FADT are
 770          * not supported.
 771          */
 772         if (gsi != acpi_gbl_FADT.sci_interrupt)
 773                 return AE_BAD_PARAMETER;
 774
 775         if (acpi_irq_handler)
 776                 return AE_ALREADY_ACQUIRED;
 777
 778         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 779                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 780                        gsi);
 781                 return AE_OK;
 782         }
 783
 784         acpi_irq_handler = handler;
 785         acpi_irq_context = context;
 786         if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
 787                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 788                 acpi_irq_handler = NULL;
 789                 return AE_NOT_ACQUIRED;
 790         }
 791
 792         return AE_OK;
 793 }
 794
 795 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 796 {
 797         if (irq != acpi_gbl_FADT.sci_interrupt)
 798                 return AE_BAD_PARAMETER;
 799
 800         free_irq(irq, acpi_irq);
 801         acpi_irq_handler = NULL;
 802
 803         return AE_OK;
 804 }
 805
 806 /*
 807  * Running in interpreter thread context, safe to sleep
 808  */
 809
 810 void acpi_os_sleep(u64 ms)
 811 {
 812         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 813 }
 814
 815 void acpi_os_stall(u32 us)
 816 {
 817         while (us) {
 818                 u32 delay = 1000;
 819
 820                 if (delay > us)
 821                         delay = us;
 822                 udelay(delay);
 823                 touch_nmi_watchdog();
 824                 us -= delay;
 825         }
 826 }
 827
 828 /*
 829  * Support ACPI 3.0 AML Timer operand
 830  * Returns 64-bit free-running, monotonically increasing timer
 831  * with 100ns granularity
 832  */
 833 u64 acpi_os_get_timer(void)
 834 {
 835         static u64 t;
 836
 837 #ifdef  CONFIG_HPET
 838         /* TBD: use HPET if available */
 839 #endif
 840
 841 #ifdef  CONFIG_X86_PM_TIMER
 842         /* TBD: default to PM timer if HPET was not available */
 843 #endif
 844         if (!t)
 845                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 846
 847         return ++t;
 848 }
 849
 850 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 851 {
 852         u32 dummy;
 853
 854         if (!value)
 855                 value = &dummy;
 856
 857         *value = 0;
 858         if (width <= 8) {
 859                 *(u8 *) value = inb(port);
 860         } else if (width <= 16) {
 861                 *(u16 *) value = inw(port);
 862         } else if (width <= 32) {
 863                 *(u32 *) value = inl(port);
 864         } else {
 865                 BUG();
 866         }
 867
 868         return AE_OK;
 869 }
 870
 871 EXPORT_SYMBOL(acpi_os_read_port);
 872
 873 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 874 {
 875         if (width <= 8) {
 876                 outb(value, port);
 877         } else if (width <= 16) {
 878                 outw(value, port);
 879         } else if (width <= 32) {
 880                 outl(value, port);
 881         } else {
 882                 BUG();
 883         }
 884
 885         return AE_OK;
 886 }
 887
 888 EXPORT_SYMBOL(acpi_os_write_port);
 889
 890 #ifdef readq
 891 static inline u64 read64(const volatile void __iomem *addr)
 892 {
 893         return readq(addr);
 894 }
 895 #else
 896 static inline u64 read64(const volatile void __iomem *addr)
 897 {
 898         u64 l, h;
 899         l = readl(addr);
 900         h = readl(addr+4);
 901         return l | (h << 32);
 902 }
 903 #endif
 904
 905 acpi_status
 906 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 907 {
 908         void __iomem *virt_addr;
 909         unsigned int size = width / 8;
 910         bool unmap = false;
 911         u64 dummy;
 912
 913         rcu_read_lock();
 914         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 915         if (!virt_addr) {
 916                 rcu_read_unlock();
 917                 virt_addr = acpi_os_ioremap(phys_addr, size);
 918                 if (!virt_addr)
 919                         return AE_BAD_ADDRESS;
 920                 unmap = true;
 921         }
 922
 923         if (!value)
 924                 value = &dummy;
 925
 926         switch (width) {
 927         case 8:
 928                 *(u8 *) value = readb(virt_addr);
 929                 break;
 930         case 16:
 931                 *(u16 *) value = readw(virt_addr);
 932                 break;
 933         case 32:
 934                 *(u32 *) value = readl(virt_addr);
 935                 break;
 936         case 64:
 937                 *(u64 *) value = read64(virt_addr);
 938                 break;
 939         default:
 940                 BUG();
 941         }
 942
 943         if (unmap)
 944                 iounmap(virt_addr);
 945         else
 946                 rcu_read_unlock();
 947
 948         return AE_OK;
 949 }
 950
 951 #ifdef writeq
 952 static inline void write64(u64 val, volatile void __iomem *addr)
 953 {
 954         writeq(val, addr);
 955 }
 956 #else
 957 static inline void write64(u64 val, volatile void __iomem *addr)
 958 {
 959         writel(val, addr);
 960         writel(val>>32, addr+4);
 961 }
 962 #endif
 963
 964 acpi_status
 965 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 966 {
 967         void __iomem *virt_addr;
 968         unsigned int size = width / 8;
 969         bool unmap = false;
 970
 971         rcu_read_lock();
 972         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 973         if (!virt_addr) {
 974                 rcu_read_unlock();
 975                 virt_addr = acpi_os_ioremap(phys_addr, size);
 976                 if (!virt_addr)
 977                         return AE_BAD_ADDRESS;
 978                 unmap = true;
 979         }
 980
 981         switch (width) {
 982         case 8:
 983                 writeb(value, virt_addr);
 984                 break;
 985         case 16:
 986                 writew(value, virt_addr);
 987                 break;
 988         case 32:
 989                 writel(value, virt_addr);
 990                 break;
 991         case 64:
 992                 write64(value, virt_addr);
 993                 break;
 994         default:
 995                 BUG();
 996         }
 997
 998         if (unmap)
 999                 iounmap(virt_addr);
1000         else
1001                 rcu_read_unlock();
1002
1003         return AE_OK;
1004 }
1005
1006 acpi_status
1007 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1008                                u64 *value, u32 width)
1009 {
1010         int result, size;
1011         u32 value32;
1012
1013         if (!value)
1014                 return AE_BAD_PARAMETER;
1015
1016         switch (width) {
1017         case 8:
1018                 size = 1;
1019                 break;
1020         case 16:
1021                 size = 2;
1022                 break;
1023         case 32:
1024                 size = 4;
1025                 break;
1026         default:
1027                 return AE_ERROR;
1028         }
1029
1030         result = raw_pci_read(pci_id->segment, pci_id->bus,
1031                                 PCI_DEVFN(pci_id->device, pci_id->function),
1032                                 reg, size, &value32);
1033         *value = value32;
1034
1035         return (result ? AE_ERROR : AE_OK);
1036 }
1037
1038 acpi_status
1039 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1040                                 u64 value, u32 width)
1041 {
1042         int result, size;
1043
1044         switch (width) {
1045         case 8:
1046                 size = 1;
1047                 break;
1048         case 16:
1049                 size = 2;
1050                 break;
1051         case 32:
1052                 size = 4;
1053                 break;
1054         default:
1055                 return AE_ERROR;
1056         }
1057
1058         result = raw_pci_write(pci_id->segment, pci_id->bus,
1059                                 PCI_DEVFN(pci_id->device, pci_id->function),
1060                                 reg, size, value);
1061
1062         return (result ? AE_ERROR : AE_OK);
1063 }
1064
1065 static void acpi_os_execute_deferred(struct work_struct *work)
1066 {
1067         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1068
1069         if (dpc->wait)
1070                 acpi_os_wait_events_complete();
1071
1072         dpc->function(dpc->context);
1073         kfree(dpc);
1074 }
1075
1076 /*******************************************************************************
1077  *
1078  * FUNCTION:    acpi_os_execute
1079  *
1080  * PARAMETERS:  Type               - Type of the callback
1081  *              Function           - Function to be executed
1082  *              Context            - Function parameters
1083  *
1084  * RETURN:      Status
1085  *
1086  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1087  *              immediately executes function on a separate thread.
1088  *
1089  ******************************************************************************/
1090
1091 static acpi_status __acpi_os_execute(acpi_execute_type type,
1092         acpi_osd_exec_callback function, void *context, int hp)
1093 {
1094         acpi_status status = AE_OK;
1095         struct acpi_os_dpc *dpc;
1096         struct workqueue_struct *queue;
1097         int ret;
1098         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1099                           "Scheduling function [%p(%p)] for deferred execution.\n",
1100                           function, context));
1101
1102         /*
1103          * Allocate/initialize DPC structure.  Note that this memory will be
1104          * freed by the callee.  The kernel handles the work_struct list  in a
1105          * way that allows us to also free its memory inside the callee.
1106          * Because we may want to schedule several tasks with different
1107          * parameters we can't use the approach some kernel code uses of
1108          * having a static work_struct.
1109          */
1110
1111         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1112         if (!dpc)
1113                 return AE_NO_MEMORY;
1114
1115         dpc->function = function;
1116         dpc->context = context;
1117
1118         /*
1119          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1120          * because the hotplug code may call driver .remove() functions,
1121          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1122          * to flush these workqueues.
1123          *
1124          * To prevent lockdep from complaining unnecessarily, make sure that
1125          * there is a different static lockdep key for each workqueue by using
1126          * INIT_WORK() for each of them separately.
1127          */
1128         if (hp) {
1129                 queue = kacpi_hotplug_wq;
1130                 dpc->wait = 1;
1131                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1132         } else if (type == OSL_NOTIFY_HANDLER) {
1133                 queue = kacpi_notify_wq;
1134                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1135         } else {
1136                 queue = kacpid_wq;
1137                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1138         }
1139
1140         /*
1141          * On some machines, a software-initiated SMI causes corruption unless
1142          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1143          * typically it's done in GPE-related methods that are run via
1144          * workqueues, so we can avoid the known corruption cases by always
1145          * queueing on CPU 0.
1146          */
1147         ret = queue_work_on(0, queue, &dpc->work);
1148
1149         if (!ret) {
1150                 printk(KERN_ERR PREFIX
1151                           "Call to queue_work() failed.\n");
1152                 status = AE_ERROR;
1153                 kfree(dpc);
1154         }
1155         return status;
1156 }
1157
1158 acpi_status acpi_os_execute(acpi_execute_type type,
1159                             acpi_osd_exec_callback function, void *context)
1160 {
1161         return __acpi_os_execute(type, function, context, 0);
1162 }
1163 EXPORT_SYMBOL(acpi_os_execute);
1164
1165 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1166         void *context)
1167 {
1168         return __acpi_os_execute(0, function, context, 1);
1169 }
1170 EXPORT_SYMBOL(acpi_os_hotplug_execute);
1171
1172 void acpi_os_wait_events_complete(void)
1173 {
1174         flush_workqueue(kacpid_wq);
1175         flush_workqueue(kacpi_notify_wq);
1176 }
1177
1178 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1179
1180 acpi_status
1181 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1182 {
1183         struct semaphore *sem = NULL;
1184
1185         sem = acpi_os_allocate(sizeof(struct semaphore));
1186         if (!sem)
1187                 return AE_NO_MEMORY;
1188         memset(sem, 0, sizeof(struct semaphore));
1189
1190         sema_init(sem, initial_units);
1191
1192         *handle = (acpi_handle *) sem;
1193
1194         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1195                           *handle, initial_units));
1196
1197         return AE_OK;
1198 }
1199
1200 /*
1201  * TODO: A better way to delete semaphores?  Linux doesn't have a
1202  * 'delete_semaphore()' function -- may result in an invalid
1203  * pointer dereference for non-synchronized consumers.  Should
1204  * we at least check for blocked threads and signal/cancel them?
1205  */
1206
1207 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1208 {
1209         struct semaphore *sem = (struct semaphore *)handle;
1210
1211         if (!sem)
1212                 return AE_BAD_PARAMETER;
1213
1214         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1215
1216         BUG_ON(!list_empty(&sem->wait_list));
1217         kfree(sem);
1218         sem = NULL;
1219
1220         return AE_OK;
1221 }
1222
1223 /*
1224  * TODO: Support for units > 1?
1225  */
1226 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1227 {
1228         acpi_status status = AE_OK;
1229         struct semaphore *sem = (struct semaphore *)handle;
1230         long jiffies;
1231         int ret = 0;
1232
1233         if (!sem || (units < 1))
1234                 return AE_BAD_PARAMETER;
1235
1236         if (units > 1)
1237                 return AE_SUPPORT;
1238
1239         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1240                           handle, units, timeout));
1241
1242         if (timeout == ACPI_WAIT_FOREVER)
1243                 jiffies = MAX_SCHEDULE_TIMEOUT;
1244         else
1245                 jiffies = msecs_to_jiffies(timeout);
1246
1247         ret = down_timeout(sem, jiffies);
1248         if (ret)
1249                 status = AE_TIME;
1250
1251         if (ACPI_FAILURE(status)) {
1252                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1253                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1254                                   handle, units, timeout,
1255                                   acpi_format_exception(status)));
1256         } else {
1257                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1258                                   "Acquired semaphore[%p|%d|%d]", handle,
1259                                   units, timeout));
1260         }
1261
1262         return status;
1263 }
1264
1265 /*
1266  * TODO: Support for units > 1?
1267  */
1268 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1269 {
1270         struct semaphore *sem = (struct semaphore *)handle;
1271
1272         if (!sem || (units < 1))
1273                 return AE_BAD_PARAMETER;
1274
1275         if (units > 1)
1276                 return AE_SUPPORT;
1277
1278         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1279                           units));
1280
1281         up(sem);
1282
1283         return AE_OK;
1284 }
1285
1286 #ifdef ACPI_FUTURE_USAGE
1287 u32 acpi_os_get_line(char *buffer)
1288 {
1289
1290 #ifdef ENABLE_DEBUGGER
1291         if (acpi_in_debugger) {
1292                 u32 chars;
1293
1294                 kdb_read(buffer, sizeof(line_buf));
1295
1296                 /* remove the CR kdb includes */
1297                 chars = strlen(buffer) - 1;
1298                 buffer[chars] = '\0';
1299         }
1300 #endif
1301
1302         return 0;
1303 }
1304 #endif                          /*  ACPI_FUTURE_USAGE  */
1305
1306 acpi_status acpi_os_signal(u32 function, void *info)
1307 {
1308         switch (function) {
1309         case ACPI_SIGNAL_FATAL:
1310                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1311                 break;
1312         case ACPI_SIGNAL_BREAKPOINT:
1313                 /*
1314                  * AML Breakpoint
1315                  * ACPI spec. says to treat it as a NOP unless
1316                  * you are debugging.  So if/when we integrate
1317                  * AML debugger into the kernel debugger its
1318                  * hook will go here.  But until then it is
1319                  * not useful to print anything on breakpoints.
1320                  */
1321                 break;
1322         default:
1323                 break;
1324         }
1325
1326         return AE_OK;
1327 }
1328
1329 static int __init acpi_os_name_setup(char *str)
1330 {
1331         char *p = acpi_os_name;
1332         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1333
1334         if (!str || !*str)
1335                 return 0;
1336
1337         for (; count-- && str && *str; str++) {
1338                 if (isalnum(*str) || *str == ' ' || *str == ':')
1339                         *p++ = *str;
1340                 else if (*str == '\'' || *str == '"')
1341                         continue;
1342                 else
1343                         break;
1344         }
1345         *p = 0;
1346
1347         return 1;
1348
1349 }
1350
1351 __setup("acpi_os_name=", acpi_os_name_setup);
1352
1353 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1354 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1355
1356 struct osi_setup_entry {
1357         char string[OSI_STRING_LENGTH_MAX];
1358         bool enable;
1359 };
1360
1361 static struct osi_setup_entry __initdata
1362                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1363         {"Module Device", true},
1364         {"Processor Device", true},
1365         {"3.0 _SCP Extensions", true},
1366         {"Processor Aggregator Device", true},
1367 };
1368
1369 void __init acpi_osi_setup(char *str)
1370 {
1371         struct osi_setup_entry *osi;
1372         bool enable = true;
1373         int i;
1374
1375         if (!acpi_gbl_create_osi_method)
1376                 return;
1377
1378         if (str == NULL || *str == '\0') {
1379                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1380                 acpi_gbl_create_osi_method = FALSE;
1381                 return;
1382         }
1383
1384         if (*str == '!') {
1385                 str++;
1386                 enable = false;
1387         }
1388
1389         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1390                 osi = &osi_setup_entries[i];
1391                 if (!strcmp(osi->string, str)) {
1392                         osi->enable = enable;
1393                         break;
1394                 } else if (osi->string[0] == '\0') {
1395                         osi->enable = enable;
1396                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1397                         break;
1398                 }
1399         }
1400 }
1401
1402 static void __init set_osi_linux(unsigned int enable)
1403 {
1404         if (osi_linux.enable != enable)
1405                 osi_linux.enable = enable;
1406
1407         if (osi_linux.enable)
1408                 acpi_osi_setup("Linux");
1409         else
1410                 acpi_osi_setup("!Linux");
1411
1412         return;
1413 }
1414
1415 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1416 {
1417         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1418         osi_linux.dmi = 0;
1419         set_osi_linux(enable);
1420
1421         return;
1422 }
1423
1424 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1425 {
1426         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1427
1428         if (enable == -1)
1429                 return;
1430
1431         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1432         set_osi_linux(enable);
1433
1434         return;
1435 }
1436
1437 /*
1438  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1439  *
1440  * empty string disables _OSI
1441  * string starting with '!' disables that string
1442  * otherwise string is added to list, augmenting built-in strings
1443  */
1444 static void __init acpi_osi_setup_late(void)
1445 {
1446         struct osi_setup_entry *osi;
1447         char *str;
1448         int i;
1449         acpi_status status;
1450
1451         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1452                 osi = &osi_setup_entries[i];
1453                 str = osi->string;
1454
1455                 if (*str == '\0')
1456                         break;
1457                 if (osi->enable) {
1458                         status = acpi_install_interface(str);
1459
1460                         if (ACPI_SUCCESS(status))
1461                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1462                 } else {
1463                         status = acpi_remove_interface(str);
1464
1465                         if (ACPI_SUCCESS(status))
1466                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1467                 }
1468         }
1469 }
1470
1471 static int __init osi_setup(char *str)
1472 {
1473         if (str && !strcmp("Linux", str))
1474                 acpi_cmdline_osi_linux(1);
1475         else if (str && !strcmp("!Linux", str))
1476                 acpi_cmdline_osi_linux(0);
1477         else
1478                 acpi_osi_setup(str);
1479
1480         return 1;
1481 }
1482
1483 __setup("acpi_osi=", osi_setup);
1484
1485 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1486 static int __init acpi_serialize_setup(char *str)
1487 {
1488         printk(KERN_INFO PREFIX "serialize enabled\n");
1489
1490         acpi_gbl_all_methods_serialized = TRUE;
1491
1492         return 1;
1493 }
1494
1495 __setup("acpi_serialize", acpi_serialize_setup);
1496
1497 /* Check of resource interference between native drivers and ACPI
1498  * OperationRegions (SystemIO and System Memory only).
1499  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1500  * in arbitrary AML code and can interfere with legacy drivers.
1501  * acpi_enforce_resources= can be set to:
1502  *
1503  *   - strict (default) (2)
1504  *     -> further driver trying to access the resources will not load
1505  *   - lax              (1)
1506  *     -> further driver trying to access the resources will load, but you
1507  *     get a system message that something might go wrong...
1508  *
1509  *   - no               (0)
1510  *     -> ACPI Operation Region resources will not be registered
1511  *
1512  */
1513 #define ENFORCE_RESOURCES_STRICT 2
1514 #define ENFORCE_RESOURCES_LAX    1
1515 #define ENFORCE_RESOURCES_NO     0
1516
1517 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1518
1519 static int __init acpi_enforce_resources_setup(char *str)
1520 {
1521         if (str == NULL || *str == '\0')
1522                 return 0;
1523
1524         if (!strcmp("strict", str))
1525                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1526         else if (!strcmp("lax", str))
1527                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1528         else if (!strcmp("no", str))
1529                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1530
1531         return 1;
1532 }
1533
1534 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1535
1536 /* Check for resource conflicts between ACPI OperationRegions and native
1537  * drivers */
1538 int acpi_check_resource_conflict(const struct resource *res)
1539 {
1540         acpi_adr_space_type space_id;
1541         acpi_size length;
1542         u8 warn = 0;
1543         int clash = 0;
1544
1545         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1546                 return 0;
1547         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1548                 return 0;
1549
1550         if (res->flags & IORESOURCE_IO)
1551                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1552         else
1553                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1554
1555         length = resource_size(res);
1556         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1557                 warn = 1;
1558         clash = acpi_check_address_range(space_id, res->start, length, warn);
1559
1560         if (clash) {
1561                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1562                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1563                                 printk(KERN_NOTICE "ACPI: This conflict may"
1564                                        " cause random problems and system"
1565                                        " instability\n");
1566                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1567                                " for this device, you should use it instead of"
1568                                " the native driver\n");
1569                 }
1570                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1571                         return -EBUSY;
1572         }
1573         return 0;
1574 }
1575 EXPORT_SYMBOL(acpi_check_resource_conflict);
1576
1577 int acpi_check_region(resource_size_t start, resource_size_t n,
1578                       const char *name)
1579 {
1580         struct resource res = {
1581                 .start = start,
1582                 .end   = start + n - 1,
1583                 .name  = name,
1584                 .flags = IORESOURCE_IO,
1585         };
1586
1587         return acpi_check_resource_conflict(&res);
1588 }
1589 EXPORT_SYMBOL(acpi_check_region);
1590
1591 /*
1592  * Let drivers know whether the resource checks are effective
1593  */
1594 int acpi_resources_are_enforced(void)
1595 {
1596         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1597 }
1598 EXPORT_SYMBOL(acpi_resources_are_enforced);
1599
1600 /*
1601  * Deallocate the memory for a spinlock.
1602  */
1603 void acpi_os_delete_lock(acpi_spinlock handle)
1604 {
1605         ACPI_FREE(handle);
1606 }
1607
1608 /*
1609  * Acquire a spinlock.
1610  *
1611  * handle is a pointer to the spinlock_t.
1612  */
1613
1614 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1615 {
1616         acpi_cpu_flags flags;
1617         spin_lock_irqsave(lockp, flags);
1618         return flags;
1619 }
1620
1621 /*
1622  * Release a spinlock. See above.
1623  */
1624
1625 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1626 {
1627         spin_unlock_irqrestore(lockp, flags);
1628 }
1629
1630 #ifndef ACPI_USE_LOCAL_CACHE
1631
1632 /*******************************************************************************
1633  *
1634  * FUNCTION:    acpi_os_create_cache
1635  *
1636  * PARAMETERS:  name      - Ascii name for the cache
1637  *              size      - Size of each cached object
1638  *              depth     - Maximum depth of the cache (in objects) <ignored>
1639  *              cache     - Where the new cache object is returned
1640  *
1641  * RETURN:      status
1642  *
1643  * DESCRIPTION: Create a cache object
1644  *
1645  ******************************************************************************/
1646
1647 acpi_status
1648 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1649 {
1650         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1651         if (*cache == NULL)
1652                 return AE_ERROR;
1653         else
1654                 return AE_OK;
1655 }
1656
1657 /*******************************************************************************
1658  *
1659  * FUNCTION:    acpi_os_purge_cache
1660  *
1661  * PARAMETERS:  Cache           - Handle to cache object
1662  *
1663  * RETURN:      Status
1664  *
1665  * DESCRIPTION: Free all objects within the requested cache.
1666  *
1667  ******************************************************************************/
1668
1669 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1670 {
1671         kmem_cache_shrink(cache);
1672         return (AE_OK);
1673 }
1674
1675 /*******************************************************************************
1676  *
1677  * FUNCTION:    acpi_os_delete_cache
1678  *
1679  * PARAMETERS:  Cache           - Handle to cache object
1680  *
1681  * RETURN:      Status
1682  *
1683  * DESCRIPTION: Free all objects within the requested cache and delete the
1684  *              cache object.
1685  *
1686  ******************************************************************************/
1687
1688 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1689 {
1690         kmem_cache_destroy(cache);
1691         return (AE_OK);
1692 }
1693
1694 /*******************************************************************************
1695  *
1696  * FUNCTION:    acpi_os_release_object
1697  *
1698  * PARAMETERS:  Cache       - Handle to cache object
1699  *              Object      - The object to be released
1700  *
1701  * RETURN:      None
1702  *
1703  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1704  *              the object is deleted.
1705  *
1706  ******************************************************************************/
1707
1708 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1709 {
1710         kmem_cache_free(cache, object);
1711         return (AE_OK);
1712 }
1713 #endif
1714
1715 acpi_status __init acpi_os_initialize(void)
1716 {
1717         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1718         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1719         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1720         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1721
1722         return AE_OK;
1723 }
1724
1725 acpi_status __init acpi_os_initialize1(void)
1726 {
1727         acpi_reserve_resources();
1728         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1729         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1730         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1731         BUG_ON(!kacpid_wq);
1732         BUG_ON(!kacpi_notify_wq);
1733         BUG_ON(!kacpi_hotplug_wq);
1734         acpi_install_interface_handler(acpi_osi_handler);
1735         acpi_osi_setup_late();
1736         return AE_OK;
1737 }
1738
1739 acpi_status acpi_os_terminate(void)
1740 {
1741         if (acpi_irq_handler) {
1742                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1743                                                  acpi_irq_handler);
1744         }
1745
1746         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1747         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1748         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1749         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1750
1751         destroy_workqueue(kacpid_wq);
1752         destroy_workqueue(kacpi_notify_wq);
1753         destroy_workqueue(kacpi_hotplug_wq);
1754
1755         return AE_OK;
1756 }
1757
1758 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1759                                   u32 pm1b_control)
1760 {
1761         int rc = 0;
1762         if (__acpi_os_prepare_sleep)
1763                 rc = __acpi_os_prepare_sleep(sleep_state,
1764                                              pm1a_control, pm1b_control);
1765         if (rc < 0)
1766                 return AE_ERROR;
1767         else if (rc > 0)
1768                 return AE_CTRL_SKIP;
1769
1770         return AE_OK;
1771 }
1772
1773 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1774                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1775 {
1776         __acpi_os_prepare_sleep = func;
1777 }
1778
1779 void alloc_acpi_hp_work(acpi_handle handle, u32 type, void *context,
1780                         void (*func)(struct work_struct *work))
1781 {
1782         struct acpi_hp_work *hp_work;
1783         int ret;
1784
1785         hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1786         if (!hp_work)
1787                 return;
1788
1789         hp_work->handle = handle;
1790         hp_work->type = type;
1791         hp_work->context = context;
1792
1793         INIT_WORK(&hp_work->work, func);
1794         ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1795         if (!ret)
1796                 kfree(hp_work);
1797 }
1798 EXPORT_SYMBOL_GPL(alloc_acpi_hp_work);