drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <willy@linux.intel.com>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/highmem.h>
  35 #include <linux/pci.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/kmod.h>
  38 #include <linux/delay.h>
  39 #include <linux/workqueue.h>
  40 #include <linux/nmi.h>
  41 #include <linux/acpi.h>
  42 #include <linux/acpi_io.h>
  43 #include <linux/efi.h>
  44 #include <linux/ioport.h>
  45 #include <linux/list.h>
  46 #include <linux/jiffies.h>
  47 #include <linux/semaphore.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/uaccess.h>
  51
  52 #include <acpi/acpi.h>
  53 #include <acpi/acpi_bus.h>
  54 #include <acpi/processor.h>
  55
  56 #define _COMPONENT              ACPI_OS_SERVICES
  57 ACPI_MODULE_NAME("osl");
  58 #define PREFIX          "ACPI: "
  59 struct acpi_os_dpc {
  60         acpi_osd_exec_callback function;
  61         void *context;
  62         struct work_struct work;
  63         int wait;
  64 };
  65
  66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  68 #endif
  69
  70 #ifdef ENABLE_DEBUGGER
  71 #include <linux/kdb.h>
  72
  73 /* stuff for debugger support */
  74 int acpi_in_debugger;
  75 EXPORT_SYMBOL(acpi_in_debugger);
  76
  77 extern char line_buf[80];
  78 #endif                          /*ENABLE_DEBUGGER */
  79
  80 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  81                                       u32 pm1b_ctrl);
  82
  83 static acpi_osd_handler acpi_irq_handler;
  84 static void *acpi_irq_context;
  85 static struct workqueue_struct *kacpid_wq;
  86 static struct workqueue_struct *kacpi_notify_wq;
  87 struct workqueue_struct *kacpi_hotplug_wq;
  88 EXPORT_SYMBOL(kacpi_hotplug_wq);
  89
  90 /*
  91  * This list of permanent mappings is for memory that may be accessed from
  92  * interrupt context, where we can't do the ioremap().
  93  */
  94 struct acpi_ioremap {
  95         struct list_head list;
  96         void __iomem *virt;
  97         acpi_physical_address phys;
  98         acpi_size size;
  99         unsigned long refcount;
 100 };
 101
 102 static LIST_HEAD(acpi_ioremaps);
 103 static DEFINE_MUTEX(acpi_ioremap_lock);
 104
 105 static void __init acpi_osi_setup_late(void);
 106
 107 /*
 108  * The story of _OSI(Linux)
 109  *
 110  * From pre-history through Linux-2.6.22,
 111  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 112  *
 113  * Unfortunately, reference BIOS writers got wind of this
 114  * and put OSI(Linux) in their example code, quickly exposing
 115  * this string as ill-conceived and opening the door to
 116  * an un-bounded number of BIOS incompatibilities.
 117  *
 118  * For example, OSI(Linux) was used on resume to re-POST a
 119  * video card on one system, because Linux at that time
 120  * could not do a speedy restore in its native driver.
 121  * But then upon gaining quick native restore capability,
 122  * Linux has no way to tell the BIOS to skip the time-consuming
 123  * POST -- putting Linux at a permanent performance disadvantage.
 124  * On another system, the BIOS writer used OSI(Linux)
 125  * to infer native OS support for IPMI!  On other systems,
 126  * OSI(Linux) simply got in the way of Linux claiming to
 127  * be compatible with other operating systems, exposing
 128  * BIOS issues such as skipped device initialization.
 129  *
 130  * So "Linux" turned out to be a really poor chose of
 131  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 132  *
 133  * BIOS writers should NOT query _OSI(Linux) on future systems.
 134  * Linux will complain on the console when it sees it, and return FALSE.
 135  * To get Linux to return TRUE for your system  will require
 136  * a kernel source update to add a DMI entry,
 137  * or boot with "acpi_osi=Linux"
 138  */
 139
 140 static struct osi_linux {
 141         unsigned int    enable:1;
 142         unsigned int    dmi:1;
 143         unsigned int    cmdline:1;
 144 } osi_linux = {0, 0, 0};
 145
 146 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 147 {
 148         if (!strcmp("Linux", interface)) {
 149
 150                 printk_once(KERN_NOTICE FW_BUG PREFIX
 151                         "BIOS _OSI(Linux) query %s%s\n",
 152                         osi_linux.enable ? "honored" : "ignored",
 153                         osi_linux.cmdline ? " via cmdline" :
 154                         osi_linux.dmi ? " via DMI" : "");
 155         }
 156
 157         return supported;
 158 }
 159
 160 static void __init acpi_request_region (struct acpi_generic_address *gas,
 161         unsigned int length, char *desc)
 162 {
 163         u64 addr;
 164
 165         /* Handle possible alignment issues */
 166         memcpy(&addr, &gas->address, sizeof(addr));
 167         if (!addr || !length)
 168                 return;
 169
 170         /* Resources are never freed */
 171         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 172                 request_region(addr, length, desc);
 173         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 174                 request_mem_region(addr, length, desc);
 175 }
 176
 177 static int __init acpi_reserve_resources(void)
 178 {
 179         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 180                 "ACPI PM1a_EVT_BLK");
 181
 182         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 183                 "ACPI PM1b_EVT_BLK");
 184
 185         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 186                 "ACPI PM1a_CNT_BLK");
 187
 188         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 189                 "ACPI PM1b_CNT_BLK");
 190
 191         if (acpi_gbl_FADT.pm_timer_length == 4)
 192                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 193
 194         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 195                 "ACPI PM2_CNT_BLK");
 196
 197         /* Length of GPE blocks must be a non-negative multiple of 2 */
 198
 199         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 200                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 201                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 202
 203         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 204                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 205                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 206
 207         return 0;
 208 }
 209 device_initcall(acpi_reserve_resources);
 210
 211 void acpi_os_printf(const char *fmt, ...)
 212 {
 213         va_list args;
 214         va_start(args, fmt);
 215         acpi_os_vprintf(fmt, args);
 216         va_end(args);
 217 }
 218
 219 void acpi_os_vprintf(const char *fmt, va_list args)
 220 {
 221         static char buffer[512];
 222
 223         vsprintf(buffer, fmt, args);
 224
 225 #ifdef ENABLE_DEBUGGER
 226         if (acpi_in_debugger) {
 227                 kdb_printf("%s", buffer);
 228         } else {
 229                 printk(KERN_CONT "%s", buffer);
 230         }
 231 #else
 232         printk(KERN_CONT "%s", buffer);
 233 #endif
 234 }
 235
 236 #ifdef CONFIG_KEXEC
 237 static unsigned long acpi_rsdp;
 238 static int __init setup_acpi_rsdp(char *arg)
 239 {
 240         acpi_rsdp = simple_strtoul(arg, NULL, 16);
 241         return 0;
 242 }
 243 early_param("acpi_rsdp", setup_acpi_rsdp);
 244 #endif
 245
 246 acpi_physical_address __init acpi_os_get_root_pointer(void)
 247 {
 248 #ifdef CONFIG_KEXEC
 249         if (acpi_rsdp)
 250                 return acpi_rsdp;
 251 #endif
 252
 253         if (efi_enabled) {
 254                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 255                         return efi.acpi20;
 256                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 257                         return efi.acpi;
 258                 else {
 259                         printk(KERN_ERR PREFIX
 260                                "System description tables not found\n");
 261                         return 0;
 262                 }
 263         } else {
 264                 acpi_physical_address pa = 0;
 265
 266                 acpi_find_root_pointer(&pa);
 267                 return pa;
 268         }
 269 }
 270
 271 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 272 static struct acpi_ioremap *
 273 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 274 {
 275         struct acpi_ioremap *map;
 276
 277         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 278                 if (map->phys <= phys &&
 279                     phys + size <= map->phys + map->size)
 280                         return map;
 281
 282         return NULL;
 283 }
 284
 285 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 286 static void __iomem *
 287 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 288 {
 289         struct acpi_ioremap *map;
 290
 291         map = acpi_map_lookup(phys, size);
 292         if (map)
 293                 return map->virt + (phys - map->phys);
 294
 295         return NULL;
 296 }
 297
 298 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 299 {
 300         struct acpi_ioremap *map;
 301         void __iomem *virt = NULL;
 302
 303         mutex_lock(&acpi_ioremap_lock);
 304         map = acpi_map_lookup(phys, size);
 305         if (map) {
 306                 virt = map->virt + (phys - map->phys);
 307                 map->refcount++;
 308         }
 309         mutex_unlock(&acpi_ioremap_lock);
 310         return virt;
 311 }
 312 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 313
 314 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 315 static struct acpi_ioremap *
 316 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 317 {
 318         struct acpi_ioremap *map;
 319
 320         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 321                 if (map->virt <= virt &&
 322                     virt + size <= map->virt + map->size)
 323                         return map;
 324
 325         return NULL;
 326 }
 327
 328 #ifndef CONFIG_IA64
 329 #define should_use_kmap(pfn)   page_is_ram(pfn)
 330 #else
 331 /* ioremap will take care of cache attributes */
 332 #define should_use_kmap(pfn)   0
 333 #endif
 334
 335 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 336 {
 337         unsigned long pfn;
 338
 339         pfn = pg_off >> PAGE_SHIFT;
 340         if (should_use_kmap(pfn)) {
 341                 if (pg_sz > PAGE_SIZE)
 342                         return NULL;
 343                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 344         } else
 345                 return acpi_os_ioremap(pg_off, pg_sz);
 346 }
 347
 348 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 349 {
 350         unsigned long pfn;
 351
 352         pfn = pg_off >> PAGE_SHIFT;
 353         if (should_use_kmap(pfn))
 354                 kunmap(pfn_to_page(pfn));
 355         else
 356                 iounmap(vaddr);
 357 }
 358
 359 void __iomem *__init_refok
 360 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 361 {
 362         struct acpi_ioremap *map;
 363         void __iomem *virt;
 364         acpi_physical_address pg_off;
 365         acpi_size pg_sz;
 366
 367         if (phys > ULONG_MAX) {
 368                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 369                 return NULL;
 370         }
 371
 372         if (!acpi_gbl_permanent_mmap)
 373                 return __acpi_map_table((unsigned long)phys, size);
 374
 375         mutex_lock(&acpi_ioremap_lock);
 376         /* Check if there's a suitable mapping already. */
 377         map = acpi_map_lookup(phys, size);
 378         if (map) {
 379                 map->refcount++;
 380                 goto out;
 381         }
 382
 383         map = kzalloc(sizeof(*map), GFP_KERNEL);
 384         if (!map) {
 385                 mutex_unlock(&acpi_ioremap_lock);
 386                 return NULL;
 387         }
 388
 389         pg_off = round_down(phys, PAGE_SIZE);
 390         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 391         virt = acpi_map(pg_off, pg_sz);
 392         if (!virt) {
 393                 mutex_unlock(&acpi_ioremap_lock);
 394                 kfree(map);
 395                 return NULL;
 396         }
 397
 398         INIT_LIST_HEAD(&map->list);
 399         map->virt = virt;
 400         map->phys = pg_off;
 401         map->size = pg_sz;
 402         map->refcount = 1;
 403
 404         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 405
 406  out:
 407         mutex_unlock(&acpi_ioremap_lock);
 408         return map->virt + (phys - map->phys);
 409 }
 410 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 411
 412 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 413 {
 414         if (!--map->refcount)
 415                 list_del_rcu(&map->list);
 416 }
 417
 418 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 419 {
 420         if (!map->refcount) {
 421                 synchronize_rcu();
 422                 acpi_unmap(map->phys, map->virt);
 423                 kfree(map);
 424         }
 425 }
 426
 427 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 428 {
 429         struct acpi_ioremap *map;
 430
 431         if (!acpi_gbl_permanent_mmap) {
 432                 __acpi_unmap_table(virt, size);
 433                 return;
 434         }
 435
 436         mutex_lock(&acpi_ioremap_lock);
 437         map = acpi_map_lookup_virt(virt, size);
 438         if (!map) {
 439                 mutex_unlock(&acpi_ioremap_lock);
 440                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 441                 return;
 442         }
 443         acpi_os_drop_map_ref(map);
 444         mutex_unlock(&acpi_ioremap_lock);
 445
 446         acpi_os_map_cleanup(map);
 447 }
 448 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 449
 450 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 451 {
 452         if (!acpi_gbl_permanent_mmap)
 453                 __acpi_unmap_table(virt, size);
 454 }
 455
 456 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 457 {
 458         u64 addr;
 459         void __iomem *virt;
 460
 461         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 462                 return 0;
 463
 464         /* Handle possible alignment issues */
 465         memcpy(&addr, &gas->address, sizeof(addr));
 466         if (!addr || !gas->bit_width)
 467                 return -EINVAL;
 468
 469         virt = acpi_os_map_memory(addr, gas->bit_width / 8);
 470         if (!virt)
 471                 return -EIO;
 472
 473         return 0;
 474 }
 475 EXPORT_SYMBOL(acpi_os_map_generic_address);
 476
 477 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 478 {
 479         u64 addr;
 480         struct acpi_ioremap *map;
 481
 482         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 483                 return;
 484
 485         /* Handle possible alignment issues */
 486         memcpy(&addr, &gas->address, sizeof(addr));
 487         if (!addr || !gas->bit_width)
 488                 return;
 489
 490         mutex_lock(&acpi_ioremap_lock);
 491         map = acpi_map_lookup(addr, gas->bit_width / 8);
 492         if (!map) {
 493                 mutex_unlock(&acpi_ioremap_lock);
 494                 return;
 495         }
 496         acpi_os_drop_map_ref(map);
 497         mutex_unlock(&acpi_ioremap_lock);
 498
 499         acpi_os_map_cleanup(map);
 500 }
 501 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 502
 503 #ifdef ACPI_FUTURE_USAGE
 504 acpi_status
 505 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 506 {
 507         if (!phys || !virt)
 508                 return AE_BAD_PARAMETER;
 509
 510         *phys = virt_to_phys(virt);
 511
 512         return AE_OK;
 513 }
 514 #endif
 515
 516 #define ACPI_MAX_OVERRIDE_LEN 100
 517
 518 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 519
 520 acpi_status
 521 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 522                             acpi_string * new_val)
 523 {
 524         if (!init_val || !new_val)
 525                 return AE_BAD_PARAMETER;
 526
 527         *new_val = NULL;
 528         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 529                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 530                        acpi_os_name);
 531                 *new_val = acpi_os_name;
 532         }
 533
 534         return AE_OK;
 535 }
 536
 537 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 538 #include <linux/earlycpio.h>
 539 #include <linux/memblock.h>
 540
 541 static u64 acpi_tables_addr;
 542 static int all_tables_size;
 543
 544 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 545 u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 546 {
 547         u8 sum = 0;
 548         u8 *end = buffer + length;
 549
 550         while (buffer < end)
 551                 sum = (u8) (sum + *(buffer++));
 552         return sum;
 553 }
 554
 555 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 556 static const char * const table_sigs[] = {
 557         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 558         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 559         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 560         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 561         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 562         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 563         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 564         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 565         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 566
 567 /* Non-fatal errors: Affected tables/files are ignored */
 568 #define INVALID_TABLE(x, path, name)                                    \
 569         { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); continue; }
 570
 571 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 572
 573 /* Must not increase 10 or needs code modification below */
 574 #define ACPI_OVERRIDE_TABLES 10
 575
 576 void __init acpi_initrd_override(void *data, size_t size)
 577 {
 578         int sig, no, table_nr = 0, total_offset = 0;
 579         long offset = 0;
 580         struct acpi_table_header *table;
 581         char cpio_path[32] = "kernel/firmware/acpi/";
 582         struct cpio_data file;
 583         struct cpio_data early_initrd_files[ACPI_OVERRIDE_TABLES];
 584         char *p;
 585
 586         if (data == NULL || size == 0)
 587                 return;
 588
 589         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 590                 file = find_cpio_data(cpio_path, data, size, &offset);
 591                 if (!file.data)
 592                         break;
 593
 594                 data += offset;
 595                 size -= offset;
 596
 597                 if (file.size < sizeof(struct acpi_table_header))
 598                         INVALID_TABLE("Table smaller than ACPI header",
 599                                       cpio_path, file.name);
 600
 601                 table = file.data;
 602
 603                 for (sig = 0; table_sigs[sig]; sig++)
 604                         if (!memcmp(table->signature, table_sigs[sig], 4))
 605                                 break;
 606
 607                 if (!table_sigs[sig])
 608                         INVALID_TABLE("Unknown signature",
 609                                       cpio_path, file.name);
 610                 if (file.size != table->length)
 611                         INVALID_TABLE("File length does not match table length",
 612                                       cpio_path, file.name);
 613                 if (acpi_table_checksum(file.data, table->length))
 614                         INVALID_TABLE("Bad table checksum",
 615                                       cpio_path, file.name);
 616
 617                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 618                         table->signature, cpio_path, file.name, table->length);
 619
 620                 all_tables_size += table->length;
 621                 early_initrd_files[table_nr].data = file.data;
 622                 early_initrd_files[table_nr].size = file.size;
 623                 table_nr++;
 624         }
 625         if (table_nr == 0)
 626                 return;
 627
 628         acpi_tables_addr =
 629                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 630                                        all_tables_size, PAGE_SIZE);
 631         if (!acpi_tables_addr) {
 632                 WARN_ON(1);
 633                 return;
 634         }
 635         /*
 636          * Only calling e820_add_reserve does not work and the
 637          * tables are invalid (memory got used) later.
 638          * memblock_reserve works as expected and the tables won't get modified.
 639          * But it's not enough on X86 because ioremap will
 640          * complain later (used by acpi_os_map_memory) that the pages
 641          * that should get mapped are not marked "reserved".
 642          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 643          * works fine.
 644          */
 645         memblock_reserve(acpi_tables_addr, acpi_tables_addr + all_tables_size);
 646         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 647
 648         p = early_ioremap(acpi_tables_addr, all_tables_size);
 649
 650         for (no = 0; no < table_nr; no++) {
 651                 memcpy(p + total_offset, early_initrd_files[no].data,
 652                        early_initrd_files[no].size);
 653                 total_offset += early_initrd_files[no].size;
 654         }
 655         early_iounmap(p, all_tables_size);
 656 }
 657 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 658
 659 acpi_status
 660 acpi_os_table_override(struct acpi_table_header * existing_table,
 661                        struct acpi_table_header ** new_table)
 662 {
 663         if (!existing_table || !new_table)
 664                 return AE_BAD_PARAMETER;
 665
 666         *new_table = NULL;
 667
 668 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 669         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 670                 *new_table = (struct acpi_table_header *)AmlCode;
 671 #endif
 672         if (*new_table != NULL) {
 673                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 674                            "this is unsafe: tainting kernel\n",
 675                        existing_table->signature,
 676                        existing_table->oem_table_id);
 677                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 678         }
 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         return AE_OK;
 740 #endif
 741 }
 742
 743 static irqreturn_t acpi_irq(int irq, void *dev_id)
 744 {
 745         u32 handled;
 746
 747         handled = (*acpi_irq_handler) (acpi_irq_context);
 748
 749         if (handled) {
 750                 acpi_irq_handled++;
 751                 return IRQ_HANDLED;
 752         } else {
 753                 acpi_irq_not_handled++;
 754                 return IRQ_NONE;
 755         }
 756 }
 757
 758 acpi_status
 759 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 760                                   void *context)
 761 {
 762         unsigned int irq;
 763
 764         acpi_irq_stats_init();
 765
 766         /*
 767          * ACPI interrupts different from the SCI in our copy of the FADT are
 768          * not supported.
 769          */
 770         if (gsi != acpi_gbl_FADT.sci_interrupt)
 771                 return AE_BAD_PARAMETER;
 772
 773         if (acpi_irq_handler)
 774                 return AE_ALREADY_ACQUIRED;
 775
 776         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 777                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 778                        gsi);
 779                 return AE_OK;
 780         }
 781
 782         acpi_irq_handler = handler;
 783         acpi_irq_context = context;
 784         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 785                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 786                 acpi_irq_handler = NULL;
 787                 return AE_NOT_ACQUIRED;
 788         }
 789
 790         return AE_OK;
 791 }
 792
 793 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 794 {
 795         if (irq != acpi_gbl_FADT.sci_interrupt)
 796                 return AE_BAD_PARAMETER;
 797
 798         free_irq(irq, acpi_irq);
 799         acpi_irq_handler = NULL;
 800
 801         return AE_OK;
 802 }
 803
 804 /*
 805  * Running in interpreter thread context, safe to sleep
 806  */
 807
 808 void acpi_os_sleep(u64 ms)
 809 {
 810         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 811 }
 812
 813 void acpi_os_stall(u32 us)
 814 {
 815         while (us) {
 816                 u32 delay = 1000;
 817
 818                 if (delay > us)
 819                         delay = us;
 820                 udelay(delay);
 821                 touch_nmi_watchdog();
 822                 us -= delay;
 823         }
 824 }
 825
 826 /*
 827  * Support ACPI 3.0 AML Timer operand
 828  * Returns 64-bit free-running, monotonically increasing timer
 829  * with 100ns granularity
 830  */
 831 u64 acpi_os_get_timer(void)
 832 {
 833         static u64 t;
 834
 835 #ifdef  CONFIG_HPET
 836         /* TBD: use HPET if available */
 837 #endif
 838
 839 #ifdef  CONFIG_X86_PM_TIMER
 840         /* TBD: default to PM timer if HPET was not available */
 841 #endif
 842         if (!t)
 843                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 844
 845         return ++t;
 846 }
 847
 848 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 849 {
 850         u32 dummy;
 851
 852         if (!value)
 853                 value = &dummy;
 854
 855         *value = 0;
 856         if (width <= 8) {
 857                 *(u8 *) value = inb(port);
 858         } else if (width <= 16) {
 859                 *(u16 *) value = inw(port);
 860         } else if (width <= 32) {
 861                 *(u32 *) value = inl(port);
 862         } else {
 863                 BUG();
 864         }
 865
 866         return AE_OK;
 867 }
 868
 869 EXPORT_SYMBOL(acpi_os_read_port);
 870
 871 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 872 {
 873         if (width <= 8) {
 874                 outb(value, port);
 875         } else if (width <= 16) {
 876                 outw(value, port);
 877         } else if (width <= 32) {
 878                 outl(value, port);
 879         } else {
 880                 BUG();
 881         }
 882
 883         return AE_OK;
 884 }
 885
 886 EXPORT_SYMBOL(acpi_os_write_port);
 887
 888 #ifdef readq
 889 static inline u64 read64(const volatile void __iomem *addr)
 890 {
 891         return readq(addr);
 892 }
 893 #else
 894 static inline u64 read64(const volatile void __iomem *addr)
 895 {
 896         u64 l, h;
 897         l = readl(addr);
 898         h = readl(addr+4);
 899         return l | (h << 32);
 900 }
 901 #endif
 902
 903 acpi_status
 904 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 905 {
 906         void __iomem *virt_addr;
 907         unsigned int size = width / 8;
 908         bool unmap = false;
 909         u64 dummy;
 910
 911         rcu_read_lock();
 912         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 913         if (!virt_addr) {
 914                 rcu_read_unlock();
 915                 virt_addr = acpi_os_ioremap(phys_addr, size);
 916                 if (!virt_addr)
 917                         return AE_BAD_ADDRESS;
 918                 unmap = true;
 919         }
 920
 921         if (!value)
 922                 value = &dummy;
 923
 924         switch (width) {
 925         case 8:
 926                 *(u8 *) value = readb(virt_addr);
 927                 break;
 928         case 16:
 929                 *(u16 *) value = readw(virt_addr);
 930                 break;
 931         case 32:
 932                 *(u32 *) value = readl(virt_addr);
 933                 break;
 934         case 64:
 935                 *(u64 *) value = read64(virt_addr);
 936                 break;
 937         default:
 938                 BUG();
 939         }
 940
 941         if (unmap)
 942                 iounmap(virt_addr);
 943         else
 944                 rcu_read_unlock();
 945
 946         return AE_OK;
 947 }
 948
 949 #ifdef writeq
 950 static inline void write64(u64 val, volatile void __iomem *addr)
 951 {
 952         writeq(val, addr);
 953 }
 954 #else
 955 static inline void write64(u64 val, volatile void __iomem *addr)
 956 {
 957         writel(val, addr);
 958         writel(val>>32, addr+4);
 959 }
 960 #endif
 961
 962 acpi_status
 963 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 964 {
 965         void __iomem *virt_addr;
 966         unsigned int size = width / 8;
 967         bool unmap = false;
 968
 969         rcu_read_lock();
 970         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 971         if (!virt_addr) {
 972                 rcu_read_unlock();
 973                 virt_addr = acpi_os_ioremap(phys_addr, size);
 974                 if (!virt_addr)
 975                         return AE_BAD_ADDRESS;
 976                 unmap = true;
 977         }
 978
 979         switch (width) {
 980         case 8:
 981                 writeb(value, virt_addr);
 982                 break;
 983         case 16:
 984                 writew(value, virt_addr);
 985                 break;
 986         case 32:
 987                 writel(value, virt_addr);
 988                 break;
 989         case 64:
 990                 write64(value, virt_addr);
 991                 break;
 992         default:
 993                 BUG();
 994         }
 995
 996         if (unmap)
 997                 iounmap(virt_addr);
 998         else
 999                 rcu_read_unlock();
1000
1001         return AE_OK;
1002 }
1003
1004 acpi_status
1005 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1006                                u64 *value, u32 width)
1007 {
1008         int result, size;
1009         u32 value32;
1010
1011         if (!value)
1012                 return AE_BAD_PARAMETER;
1013
1014         switch (width) {
1015         case 8:
1016                 size = 1;
1017                 break;
1018         case 16:
1019                 size = 2;
1020                 break;
1021         case 32:
1022                 size = 4;
1023                 break;
1024         default:
1025                 return AE_ERROR;
1026         }
1027
1028         result = raw_pci_read(pci_id->segment, pci_id->bus,
1029                                 PCI_DEVFN(pci_id->device, pci_id->function),
1030                                 reg, size, &value32);
1031         *value = value32;
1032
1033         return (result ? AE_ERROR : AE_OK);
1034 }
1035
1036 acpi_status
1037 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1038                                 u64 value, u32 width)
1039 {
1040         int result, size;
1041
1042         switch (width) {
1043         case 8:
1044                 size = 1;
1045                 break;
1046         case 16:
1047                 size = 2;
1048                 break;
1049         case 32:
1050                 size = 4;
1051                 break;
1052         default:
1053                 return AE_ERROR;
1054         }
1055
1056         result = raw_pci_write(pci_id->segment, pci_id->bus,
1057                                 PCI_DEVFN(pci_id->device, pci_id->function),
1058                                 reg, size, value);
1059
1060         return (result ? AE_ERROR : AE_OK);
1061 }
1062
1063 static void acpi_os_execute_deferred(struct work_struct *work)
1064 {
1065         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1066
1067         if (dpc->wait)
1068                 acpi_os_wait_events_complete();
1069
1070         dpc->function(dpc->context);
1071         kfree(dpc);
1072 }
1073
1074 /*******************************************************************************
1075  *
1076  * FUNCTION:    acpi_os_execute
1077  *
1078  * PARAMETERS:  Type               - Type of the callback
1079  *              Function           - Function to be executed
1080  *              Context            - Function parameters
1081  *
1082  * RETURN:      Status
1083  *
1084  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1085  *              immediately executes function on a separate thread.
1086  *
1087  ******************************************************************************/
1088
1089 static acpi_status __acpi_os_execute(acpi_execute_type type,
1090         acpi_osd_exec_callback function, void *context, int hp)
1091 {
1092         acpi_status status = AE_OK;
1093         struct acpi_os_dpc *dpc;
1094         struct workqueue_struct *queue;
1095         int ret;
1096         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1097                           "Scheduling function [%p(%p)] for deferred execution.\n",
1098                           function, context));
1099
1100         /*
1101          * Allocate/initialize DPC structure.  Note that this memory will be
1102          * freed by the callee.  The kernel handles the work_struct list  in a
1103          * way that allows us to also free its memory inside the callee.
1104          * Because we may want to schedule several tasks with different
1105          * parameters we can't use the approach some kernel code uses of
1106          * having a static work_struct.
1107          */
1108
1109         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1110         if (!dpc)
1111                 return AE_NO_MEMORY;
1112
1113         dpc->function = function;
1114         dpc->context = context;
1115
1116         /*
1117          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1118          * because the hotplug code may call driver .remove() functions,
1119          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1120          * to flush these workqueues.
1121          */
1122         queue = hp ? kacpi_hotplug_wq :
1123                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
1124         dpc->wait = hp ? 1 : 0;
1125
1126         if (queue == kacpi_hotplug_wq)
1127                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1128         else if (queue == kacpi_notify_wq)
1129                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1130         else
1131                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1132
1133         /*
1134          * On some machines, a software-initiated SMI causes corruption unless
1135          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1136          * typically it's done in GPE-related methods that are run via
1137          * workqueues, so we can avoid the known corruption cases by always
1138          * queueing on CPU 0.
1139          */
1140         ret = queue_work_on(0, queue, &dpc->work);
1141
1142         if (!ret) {
1143                 printk(KERN_ERR PREFIX
1144                           "Call to queue_work() failed.\n");
1145                 status = AE_ERROR;
1146                 kfree(dpc);
1147         }
1148         return status;
1149 }
1150
1151 acpi_status acpi_os_execute(acpi_execute_type type,
1152                             acpi_osd_exec_callback function, void *context)
1153 {
1154         return __acpi_os_execute(type, function, context, 0);
1155 }
1156 EXPORT_SYMBOL(acpi_os_execute);
1157
1158 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1159         void *context)
1160 {
1161         return __acpi_os_execute(0, function, context, 1);
1162 }
1163
1164 void acpi_os_wait_events_complete(void)
1165 {
1166         flush_workqueue(kacpid_wq);
1167         flush_workqueue(kacpi_notify_wq);
1168 }
1169
1170 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1171
1172 acpi_status
1173 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1174 {
1175         struct semaphore *sem = NULL;
1176
1177         sem = acpi_os_allocate(sizeof(struct semaphore));
1178         if (!sem)
1179                 return AE_NO_MEMORY;
1180         memset(sem, 0, sizeof(struct semaphore));
1181
1182         sema_init(sem, initial_units);
1183
1184         *handle = (acpi_handle *) sem;
1185
1186         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1187                           *handle, initial_units));
1188
1189         return AE_OK;
1190 }
1191
1192 /*
1193  * TODO: A better way to delete semaphores?  Linux doesn't have a
1194  * 'delete_semaphore()' function -- may result in an invalid
1195  * pointer dereference for non-synchronized consumers.  Should
1196  * we at least check for blocked threads and signal/cancel them?
1197  */
1198
1199 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1200 {
1201         struct semaphore *sem = (struct semaphore *)handle;
1202
1203         if (!sem)
1204                 return AE_BAD_PARAMETER;
1205
1206         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1207
1208         BUG_ON(!list_empty(&sem->wait_list));
1209         kfree(sem);
1210         sem = NULL;
1211
1212         return AE_OK;
1213 }
1214
1215 /*
1216  * TODO: Support for units > 1?
1217  */
1218 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1219 {
1220         acpi_status status = AE_OK;
1221         struct semaphore *sem = (struct semaphore *)handle;
1222         long jiffies;
1223         int ret = 0;
1224
1225         if (!sem || (units < 1))
1226                 return AE_BAD_PARAMETER;
1227
1228         if (units > 1)
1229                 return AE_SUPPORT;
1230
1231         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1232                           handle, units, timeout));
1233
1234         if (timeout == ACPI_WAIT_FOREVER)
1235                 jiffies = MAX_SCHEDULE_TIMEOUT;
1236         else
1237                 jiffies = msecs_to_jiffies(timeout);
1238
1239         ret = down_timeout(sem, jiffies);
1240         if (ret)
1241                 status = AE_TIME;
1242
1243         if (ACPI_FAILURE(status)) {
1244                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1245                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1246                                   handle, units, timeout,
1247                                   acpi_format_exception(status)));
1248         } else {
1249                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1250                                   "Acquired semaphore[%p|%d|%d]", handle,
1251                                   units, timeout));
1252         }
1253
1254         return status;
1255 }
1256
1257 /*
1258  * TODO: Support for units > 1?
1259  */
1260 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1261 {
1262         struct semaphore *sem = (struct semaphore *)handle;
1263
1264         if (!sem || (units < 1))
1265                 return AE_BAD_PARAMETER;
1266
1267         if (units > 1)
1268                 return AE_SUPPORT;
1269
1270         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1271                           units));
1272
1273         up(sem);
1274
1275         return AE_OK;
1276 }
1277
1278 #ifdef ACPI_FUTURE_USAGE
1279 u32 acpi_os_get_line(char *buffer)
1280 {
1281
1282 #ifdef ENABLE_DEBUGGER
1283         if (acpi_in_debugger) {
1284                 u32 chars;
1285
1286                 kdb_read(buffer, sizeof(line_buf));
1287
1288                 /* remove the CR kdb includes */
1289                 chars = strlen(buffer) - 1;
1290                 buffer[chars] = '\0';
1291         }
1292 #endif
1293
1294         return 0;
1295 }
1296 #endif                          /*  ACPI_FUTURE_USAGE  */
1297
1298 acpi_status acpi_os_signal(u32 function, void *info)
1299 {
1300         switch (function) {
1301         case ACPI_SIGNAL_FATAL:
1302                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1303                 break;
1304         case ACPI_SIGNAL_BREAKPOINT:
1305                 /*
1306                  * AML Breakpoint
1307                  * ACPI spec. says to treat it as a NOP unless
1308                  * you are debugging.  So if/when we integrate
1309                  * AML debugger into the kernel debugger its
1310                  * hook will go here.  But until then it is
1311                  * not useful to print anything on breakpoints.
1312                  */
1313                 break;
1314         default:
1315                 break;
1316         }
1317
1318         return AE_OK;
1319 }
1320
1321 static int __init acpi_os_name_setup(char *str)
1322 {
1323         char *p = acpi_os_name;
1324         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1325
1326         if (!str || !*str)
1327                 return 0;
1328
1329         for (; count-- && str && *str; str++) {
1330                 if (isalnum(*str) || *str == ' ' || *str == ':')
1331                         *p++ = *str;
1332                 else if (*str == '\'' || *str == '"')
1333                         continue;
1334                 else
1335                         break;
1336         }
1337         *p = 0;
1338
1339         return 1;
1340
1341 }
1342
1343 __setup("acpi_os_name=", acpi_os_name_setup);
1344
1345 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1346 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1347
1348 struct osi_setup_entry {
1349         char string[OSI_STRING_LENGTH_MAX];
1350         bool enable;
1351 };
1352
1353 static struct osi_setup_entry __initdata
1354                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1355         {"Module Device", true},
1356         {"Processor Device", true},
1357         {"3.0 _SCP Extensions", true},
1358         {"Processor Aggregator Device", true},
1359 };
1360
1361 void __init acpi_osi_setup(char *str)
1362 {
1363         struct osi_setup_entry *osi;
1364         bool enable = true;
1365         int i;
1366
1367         if (!acpi_gbl_create_osi_method)
1368                 return;
1369
1370         if (str == NULL || *str == '\0') {
1371                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1372                 acpi_gbl_create_osi_method = FALSE;
1373                 return;
1374         }
1375
1376         if (*str == '!') {
1377                 str++;
1378                 enable = false;
1379         }
1380
1381         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1382                 osi = &osi_setup_entries[i];
1383                 if (!strcmp(osi->string, str)) {
1384                         osi->enable = enable;
1385                         break;
1386                 } else if (osi->string[0] == '\0') {
1387                         osi->enable = enable;
1388                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1389                         break;
1390                 }
1391         }
1392 }
1393
1394 static void __init set_osi_linux(unsigned int enable)
1395 {
1396         if (osi_linux.enable != enable)
1397                 osi_linux.enable = enable;
1398
1399         if (osi_linux.enable)
1400                 acpi_osi_setup("Linux");
1401         else
1402                 acpi_osi_setup("!Linux");
1403
1404         return;
1405 }
1406
1407 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1408 {
1409         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1410         osi_linux.dmi = 0;
1411         set_osi_linux(enable);
1412
1413         return;
1414 }
1415
1416 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1417 {
1418         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1419
1420         if (enable == -1)
1421                 return;
1422
1423         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1424         set_osi_linux(enable);
1425
1426         return;
1427 }
1428
1429 /*
1430  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1431  *
1432  * empty string disables _OSI
1433  * string starting with '!' disables that string
1434  * otherwise string is added to list, augmenting built-in strings
1435  */
1436 static void __init acpi_osi_setup_late(void)
1437 {
1438         struct osi_setup_entry *osi;
1439         char *str;
1440         int i;
1441         acpi_status status;
1442
1443         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1444                 osi = &osi_setup_entries[i];
1445                 str = osi->string;
1446
1447                 if (*str == '\0')
1448                         break;
1449                 if (osi->enable) {
1450                         status = acpi_install_interface(str);
1451
1452                         if (ACPI_SUCCESS(status))
1453                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1454                 } else {
1455                         status = acpi_remove_interface(str);
1456
1457                         if (ACPI_SUCCESS(status))
1458                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1459                 }
1460         }
1461 }
1462
1463 static int __init osi_setup(char *str)
1464 {
1465         if (str && !strcmp("Linux", str))
1466                 acpi_cmdline_osi_linux(1);
1467         else if (str && !strcmp("!Linux", str))
1468                 acpi_cmdline_osi_linux(0);
1469         else
1470                 acpi_osi_setup(str);
1471
1472         return 1;
1473 }
1474
1475 __setup("acpi_osi=", osi_setup);
1476
1477 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1478 static int __init acpi_serialize_setup(char *str)
1479 {
1480         printk(KERN_INFO PREFIX "serialize enabled\n");
1481
1482         acpi_gbl_all_methods_serialized = TRUE;
1483
1484         return 1;
1485 }
1486
1487 __setup("acpi_serialize", acpi_serialize_setup);
1488
1489 /* Check of resource interference between native drivers and ACPI
1490  * OperationRegions (SystemIO and System Memory only).
1491  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1492  * in arbitrary AML code and can interfere with legacy drivers.
1493  * acpi_enforce_resources= can be set to:
1494  *
1495  *   - strict (default) (2)
1496  *     -> further driver trying to access the resources will not load
1497  *   - lax              (1)
1498  *     -> further driver trying to access the resources will load, but you
1499  *     get a system message that something might go wrong...
1500  *
1501  *   - no               (0)
1502  *     -> ACPI Operation Region resources will not be registered
1503  *
1504  */
1505 #define ENFORCE_RESOURCES_STRICT 2
1506 #define ENFORCE_RESOURCES_LAX    1
1507 #define ENFORCE_RESOURCES_NO     0
1508
1509 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1510
1511 static int __init acpi_enforce_resources_setup(char *str)
1512 {
1513         if (str == NULL || *str == '\0')
1514                 return 0;
1515
1516         if (!strcmp("strict", str))
1517                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1518         else if (!strcmp("lax", str))
1519                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1520         else if (!strcmp("no", str))
1521                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1522
1523         return 1;
1524 }
1525
1526 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1527
1528 /* Check for resource conflicts between ACPI OperationRegions and native
1529  * drivers */
1530 int acpi_check_resource_conflict(const struct resource *res)
1531 {
1532         acpi_adr_space_type space_id;
1533         acpi_size length;
1534         u8 warn = 0;
1535         int clash = 0;
1536
1537         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1538                 return 0;
1539         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1540                 return 0;
1541
1542         if (res->flags & IORESOURCE_IO)
1543                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1544         else
1545                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1546
1547         length = res->end - res->start + 1;
1548         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1549                 warn = 1;
1550         clash = acpi_check_address_range(space_id, res->start, length, warn);
1551
1552         if (clash) {
1553                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1554                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1555                                 printk(KERN_NOTICE "ACPI: This conflict may"
1556                                        " cause random problems and system"
1557                                        " instability\n");
1558                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1559                                " for this device, you should use it instead of"
1560                                " the native driver\n");
1561                 }
1562                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1563                         return -EBUSY;
1564         }
1565         return 0;
1566 }
1567 EXPORT_SYMBOL(acpi_check_resource_conflict);
1568
1569 int acpi_check_region(resource_size_t start, resource_size_t n,
1570                       const char *name)
1571 {
1572         struct resource res = {
1573                 .start = start,
1574                 .end   = start + n - 1,
1575                 .name  = name,
1576                 .flags = IORESOURCE_IO,
1577         };
1578
1579         return acpi_check_resource_conflict(&res);
1580 }
1581 EXPORT_SYMBOL(acpi_check_region);
1582
1583 /*
1584  * Let drivers know whether the resource checks are effective
1585  */
1586 int acpi_resources_are_enforced(void)
1587 {
1588         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1589 }
1590 EXPORT_SYMBOL(acpi_resources_are_enforced);
1591
1592 /*
1593  * Deallocate the memory for a spinlock.
1594  */
1595 void acpi_os_delete_lock(acpi_spinlock handle)
1596 {
1597         ACPI_FREE(handle);
1598 }
1599
1600 /*
1601  * Acquire a spinlock.
1602  *
1603  * handle is a pointer to the spinlock_t.
1604  */
1605
1606 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1607 {
1608         acpi_cpu_flags flags;
1609         spin_lock_irqsave(lockp, flags);
1610         return flags;
1611 }
1612
1613 /*
1614  * Release a spinlock. See above.
1615  */
1616
1617 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1618 {
1619         spin_unlock_irqrestore(lockp, flags);
1620 }
1621
1622 #ifndef ACPI_USE_LOCAL_CACHE
1623
1624 /*******************************************************************************
1625  *
1626  * FUNCTION:    acpi_os_create_cache
1627  *
1628  * PARAMETERS:  name      - Ascii name for the cache
1629  *              size      - Size of each cached object
1630  *              depth     - Maximum depth of the cache (in objects) <ignored>
1631  *              cache     - Where the new cache object is returned
1632  *
1633  * RETURN:      status
1634  *
1635  * DESCRIPTION: Create a cache object
1636  *
1637  ******************************************************************************/
1638
1639 acpi_status
1640 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1641 {
1642         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1643         if (*cache == NULL)
1644                 return AE_ERROR;
1645         else
1646                 return AE_OK;
1647 }
1648
1649 /*******************************************************************************
1650  *
1651  * FUNCTION:    acpi_os_purge_cache
1652  *
1653  * PARAMETERS:  Cache           - Handle to cache object
1654  *
1655  * RETURN:      Status
1656  *
1657  * DESCRIPTION: Free all objects within the requested cache.
1658  *
1659  ******************************************************************************/
1660
1661 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1662 {
1663         kmem_cache_shrink(cache);
1664         return (AE_OK);
1665 }
1666
1667 /*******************************************************************************
1668  *
1669  * FUNCTION:    acpi_os_delete_cache
1670  *
1671  * PARAMETERS:  Cache           - Handle to cache object
1672  *
1673  * RETURN:      Status
1674  *
1675  * DESCRIPTION: Free all objects within the requested cache and delete the
1676  *              cache object.
1677  *
1678  ******************************************************************************/
1679
1680 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1681 {
1682         kmem_cache_destroy(cache);
1683         return (AE_OK);
1684 }
1685
1686 /*******************************************************************************
1687  *
1688  * FUNCTION:    acpi_os_release_object
1689  *
1690  * PARAMETERS:  Cache       - Handle to cache object
1691  *              Object      - The object to be released
1692  *
1693  * RETURN:      None
1694  *
1695  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1696  *              the object is deleted.
1697  *
1698  ******************************************************************************/
1699
1700 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1701 {
1702         kmem_cache_free(cache, object);
1703         return (AE_OK);
1704 }
1705 #endif
1706
1707 acpi_status __init acpi_os_initialize(void)
1708 {
1709         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1710         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1711         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1712         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1713
1714         return AE_OK;
1715 }
1716
1717 acpi_status __init acpi_os_initialize1(void)
1718 {
1719         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1720         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1721         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1722         BUG_ON(!kacpid_wq);
1723         BUG_ON(!kacpi_notify_wq);
1724         BUG_ON(!kacpi_hotplug_wq);
1725         acpi_install_interface_handler(acpi_osi_handler);
1726         acpi_osi_setup_late();
1727         return AE_OK;
1728 }
1729
1730 acpi_status acpi_os_terminate(void)
1731 {
1732         if (acpi_irq_handler) {
1733                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1734                                                  acpi_irq_handler);
1735         }
1736
1737         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1738         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1739         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1740         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1741
1742         destroy_workqueue(kacpid_wq);
1743         destroy_workqueue(kacpi_notify_wq);
1744         destroy_workqueue(kacpi_hotplug_wq);
1745
1746         return AE_OK;
1747 }
1748
1749 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1750                                   u32 pm1b_control)
1751 {
1752         int rc = 0;
1753         if (__acpi_os_prepare_sleep)
1754                 rc = __acpi_os_prepare_sleep(sleep_state,
1755                                              pm1a_control, pm1b_control);
1756         if (rc < 0)
1757                 return AE_ERROR;
1758         else if (rc > 0)
1759                 return AE_CTRL_SKIP;
1760
1761         return AE_OK;
1762 }
1763
1764 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1765                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1766 {
1767         __acpi_os_prepare_sleep = func;
1768 }