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/efi.h>
  43 #include <linux/ioport.h>
  44 #include <linux/list.h>
  45 #include <linux/jiffies.h>
  46 #include <linux/semaphore.h>
  47
  48 #include <asm/io.h>
  49 #include <asm/uaccess.h>
  50
  51 #include "internal.h"
  52
  53 #define _COMPONENT              ACPI_OS_SERVICES
  54 ACPI_MODULE_NAME("osl");
  55
  56 struct acpi_os_dpc {
  57         acpi_osd_exec_callback function;
  58         void *context;
  59         struct work_struct work;
  60 };
  61
  62 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  63 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  64 #endif
  65
  66 #ifdef ENABLE_DEBUGGER
  67 #include <linux/kdb.h>
  68
  69 /* stuff for debugger support */
  70 int acpi_in_debugger;
  71 EXPORT_SYMBOL(acpi_in_debugger);
  72
  73 extern char line_buf[80];
  74 #endif                          /*ENABLE_DEBUGGER */
  75
  76 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  77                                       u32 pm1b_ctrl);
  78 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  79                                       u32 val_b);
  80
  81 static acpi_osd_handler acpi_irq_handler;
  82 static void *acpi_irq_context;
  83 static struct workqueue_struct *kacpid_wq;
  84 static struct workqueue_struct *kacpi_notify_wq;
  85 static struct workqueue_struct *kacpi_hotplug_wq;
  86
  87 /*
  88  * This list of permanent mappings is for memory that may be accessed from
  89  * interrupt context, where we can't do the ioremap().
  90  */
  91 struct acpi_ioremap {
  92         struct list_head list;
  93         void __iomem *virt;
  94         acpi_physical_address phys;
  95         acpi_size size;
  96         unsigned long refcount;
  97 };
  98
  99 static LIST_HEAD(acpi_ioremaps);
 100 static DEFINE_MUTEX(acpi_ioremap_lock);
 101
 102 static void __init acpi_osi_setup_late(void);
 103
 104 /*
 105  * The story of _OSI(Linux)
 106  *
 107  * From pre-history through Linux-2.6.22,
 108  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 109  *
 110  * Unfortunately, reference BIOS writers got wind of this
 111  * and put OSI(Linux) in their example code, quickly exposing
 112  * this string as ill-conceived and opening the door to
 113  * an un-bounded number of BIOS incompatibilities.
 114  *
 115  * For example, OSI(Linux) was used on resume to re-POST a
 116  * video card on one system, because Linux at that time
 117  * could not do a speedy restore in its native driver.
 118  * But then upon gaining quick native restore capability,
 119  * Linux has no way to tell the BIOS to skip the time-consuming
 120  * POST -- putting Linux at a permanent performance disadvantage.
 121  * On another system, the BIOS writer used OSI(Linux)
 122  * to infer native OS support for IPMI!  On other systems,
 123  * OSI(Linux) simply got in the way of Linux claiming to
 124  * be compatible with other operating systems, exposing
 125  * BIOS issues such as skipped device initialization.
 126  *
 127  * So "Linux" turned out to be a really poor chose of
 128  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 129  *
 130  * BIOS writers should NOT query _OSI(Linux) on future systems.
 131  * Linux will complain on the console when it sees it, and return FALSE.
 132  * To get Linux to return TRUE for your system  will require
 133  * a kernel source update to add a DMI entry,
 134  * or boot with "acpi_osi=Linux"
 135  */
 136
 137 static struct osi_linux {
 138         unsigned int    enable:1;
 139         unsigned int    dmi:1;
 140         unsigned int    cmdline:1;
 141         unsigned int    default_disabling:1;
 142 } osi_linux = {0, 0, 0, 0};
 143
 144 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 145 {
 146         if (!strcmp("Linux", interface)) {
 147
 148                 printk_once(KERN_NOTICE FW_BUG PREFIX
 149                         "BIOS _OSI(Linux) query %s%s\n",
 150                         osi_linux.enable ? "honored" : "ignored",
 151                         osi_linux.cmdline ? " via cmdline" :
 152                         osi_linux.dmi ? " via DMI" : "");
 153         }
 154
 155         if (!strcmp("Darwin", interface)) {
 156                 /*
 157                  * Apple firmware will behave poorly if it receives positive
 158                  * answers to "Darwin" and any other OS. Respond positively
 159                  * to Darwin and then disable all other vendor strings.
 160                  */
 161                 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
 162                 supported = ACPI_UINT32_MAX;
 163         }
 164
 165         return supported;
 166 }
 167
 168 static void __init acpi_request_region (struct acpi_generic_address *gas,
 169         unsigned int length, char *desc)
 170 {
 171         u64 addr;
 172
 173         /* Handle possible alignment issues */
 174         memcpy(&addr, &gas->address, sizeof(addr));
 175         if (!addr || !length)
 176                 return;
 177
 178         /* Resources are never freed */
 179         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 180                 request_region(addr, length, desc);
 181         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 182                 request_mem_region(addr, length, desc);
 183 }
 184
 185 static void __init acpi_reserve_resources(void)
 186 {
 187         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 188                 "ACPI PM1a_EVT_BLK");
 189
 190         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 191                 "ACPI PM1b_EVT_BLK");
 192
 193         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 194                 "ACPI PM1a_CNT_BLK");
 195
 196         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 197                 "ACPI PM1b_CNT_BLK");
 198
 199         if (acpi_gbl_FADT.pm_timer_length == 4)
 200                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 201
 202         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 203                 "ACPI PM2_CNT_BLK");
 204
 205         /* Length of GPE blocks must be a non-negative multiple of 2 */
 206
 207         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 208                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 209                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 210
 211         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 212                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 213                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 214 }
 215
 216 void acpi_os_printf(const char *fmt, ...)
 217 {
 218         va_list args;
 219         va_start(args, fmt);
 220         acpi_os_vprintf(fmt, args);
 221         va_end(args);
 222 }
 223
 224 void acpi_os_vprintf(const char *fmt, va_list args)
 225 {
 226         static char buffer[512];
 227
 228         vsprintf(buffer, fmt, args);
 229
 230 #ifdef ENABLE_DEBUGGER
 231         if (acpi_in_debugger) {
 232                 kdb_printf("%s", buffer);
 233         } else {
 234                 printk(KERN_CONT "%s", buffer);
 235         }
 236 #else
 237         printk(KERN_CONT "%s", buffer);
 238 #endif
 239 }
 240
 241 #ifdef CONFIG_KEXEC
 242 static unsigned long acpi_rsdp;
 243 static int __init setup_acpi_rsdp(char *arg)
 244 {
 245         if (kstrtoul(arg, 16, &acpi_rsdp))
 246                 return -EINVAL;
 247         return 0;
 248 }
 249 early_param("acpi_rsdp", setup_acpi_rsdp);
 250 #endif
 251
 252 acpi_physical_address __init acpi_os_get_root_pointer(void)
 253 {
 254 #ifdef CONFIG_KEXEC
 255         if (acpi_rsdp)
 256                 return acpi_rsdp;
 257 #endif
 258
 259         if (efi_enabled(EFI_CONFIG_TABLES)) {
 260                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 261                         return efi.acpi20;
 262                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 263                         return efi.acpi;
 264                 else {
 265                         printk(KERN_ERR PREFIX
 266                                "System description tables not found\n");
 267                         return 0;
 268                 }
 269         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 270                 acpi_physical_address pa = 0;
 271
 272                 acpi_find_root_pointer(&pa);
 273                 return pa;
 274         }
 275
 276         return 0;
 277 }
 278
 279 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 280 static struct acpi_ioremap *
 281 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 282 {
 283         struct acpi_ioremap *map;
 284
 285         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 286                 if (map->phys <= phys &&
 287                     phys + size <= map->phys + map->size)
 288                         return map;
 289
 290         return NULL;
 291 }
 292
 293 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 294 static void __iomem *
 295 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 296 {
 297         struct acpi_ioremap *map;
 298
 299         map = acpi_map_lookup(phys, size);
 300         if (map)
 301                 return map->virt + (phys - map->phys);
 302
 303         return NULL;
 304 }
 305
 306 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 307 {
 308         struct acpi_ioremap *map;
 309         void __iomem *virt = NULL;
 310
 311         mutex_lock(&acpi_ioremap_lock);
 312         map = acpi_map_lookup(phys, size);
 313         if (map) {
 314                 virt = map->virt + (phys - map->phys);
 315                 map->refcount++;
 316         }
 317         mutex_unlock(&acpi_ioremap_lock);
 318         return virt;
 319 }
 320 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 321
 322 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 323 static struct acpi_ioremap *
 324 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 325 {
 326         struct acpi_ioremap *map;
 327
 328         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 329                 if (map->virt <= virt &&
 330                     virt + size <= map->virt + map->size)
 331                         return map;
 332
 333         return NULL;
 334 }
 335
 336 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 337 /* ioremap will take care of cache attributes */
 338 #define should_use_kmap(pfn)   0
 339 #else
 340 #define should_use_kmap(pfn)   page_is_ram(pfn)
 341 #endif
 342
 343 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 344 {
 345         unsigned long pfn;
 346
 347         pfn = pg_off >> PAGE_SHIFT;
 348         if (should_use_kmap(pfn)) {
 349                 if (pg_sz > PAGE_SIZE)
 350                         return NULL;
 351                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 352         } else
 353                 return acpi_os_ioremap(pg_off, pg_sz);
 354 }
 355
 356 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 357 {
 358         unsigned long pfn;
 359
 360         pfn = pg_off >> PAGE_SHIFT;
 361         if (should_use_kmap(pfn))
 362                 kunmap(pfn_to_page(pfn));
 363         else
 364                 iounmap(vaddr);
 365 }
 366
 367 void __iomem *__init_refok
 368 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 369 {
 370         struct acpi_ioremap *map;
 371         void __iomem *virt;
 372         acpi_physical_address pg_off;
 373         acpi_size pg_sz;
 374
 375         if (phys > ULONG_MAX) {
 376                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 377                 return NULL;
 378         }
 379
 380         if (!acpi_gbl_permanent_mmap)
 381                 return __acpi_map_table((unsigned long)phys, size);
 382
 383         mutex_lock(&acpi_ioremap_lock);
 384         /* Check if there's a suitable mapping already. */
 385         map = acpi_map_lookup(phys, size);
 386         if (map) {
 387                 map->refcount++;
 388                 goto out;
 389         }
 390
 391         map = kzalloc(sizeof(*map), GFP_KERNEL);
 392         if (!map) {
 393                 mutex_unlock(&acpi_ioremap_lock);
 394                 return NULL;
 395         }
 396
 397         pg_off = round_down(phys, PAGE_SIZE);
 398         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 399         virt = acpi_map(pg_off, pg_sz);
 400         if (!virt) {
 401                 mutex_unlock(&acpi_ioremap_lock);
 402                 kfree(map);
 403                 return NULL;
 404         }
 405
 406         INIT_LIST_HEAD(&map->list);
 407         map->virt = virt;
 408         map->phys = pg_off;
 409         map->size = pg_sz;
 410         map->refcount = 1;
 411
 412         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 413
 414 out:
 415         mutex_unlock(&acpi_ioremap_lock);
 416         return map->virt + (phys - map->phys);
 417 }
 418 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 419
 420 void *__init_refok
 421 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 422 {
 423         return (void *)acpi_os_map_iomem(phys, size);
 424 }
 425 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 426
 427 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 428 {
 429         if (!--map->refcount)
 430                 list_del_rcu(&map->list);
 431 }
 432
 433 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 434 {
 435         if (!map->refcount) {
 436                 synchronize_rcu_expedited();
 437                 acpi_unmap(map->phys, map->virt);
 438                 kfree(map);
 439         }
 440 }
 441
 442 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 443 {
 444         struct acpi_ioremap *map;
 445
 446         if (!acpi_gbl_permanent_mmap) {
 447                 __acpi_unmap_table(virt, size);
 448                 return;
 449         }
 450
 451         mutex_lock(&acpi_ioremap_lock);
 452         map = acpi_map_lookup_virt(virt, size);
 453         if (!map) {
 454                 mutex_unlock(&acpi_ioremap_lock);
 455                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 456                 return;
 457         }
 458         acpi_os_drop_map_ref(map);
 459         mutex_unlock(&acpi_ioremap_lock);
 460
 461         acpi_os_map_cleanup(map);
 462 }
 463 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 464
 465 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 466 {
 467         return acpi_os_unmap_iomem((void __iomem *)virt, size);
 468 }
 469 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 470
 471 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 472 {
 473         if (!acpi_gbl_permanent_mmap)
 474                 __acpi_unmap_table(virt, size);
 475 }
 476
 477 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 478 {
 479         u64 addr;
 480         void __iomem *virt;
 481
 482         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 483                 return 0;
 484
 485         /* Handle possible alignment issues */
 486         memcpy(&addr, &gas->address, sizeof(addr));
 487         if (!addr || !gas->bit_width)
 488                 return -EINVAL;
 489
 490         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 491         if (!virt)
 492                 return -EIO;
 493
 494         return 0;
 495 }
 496 EXPORT_SYMBOL(acpi_os_map_generic_address);
 497
 498 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 499 {
 500         u64 addr;
 501         struct acpi_ioremap *map;
 502
 503         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 504                 return;
 505
 506         /* Handle possible alignment issues */
 507         memcpy(&addr, &gas->address, sizeof(addr));
 508         if (!addr || !gas->bit_width)
 509                 return;
 510
 511         mutex_lock(&acpi_ioremap_lock);
 512         map = acpi_map_lookup(addr, gas->bit_width / 8);
 513         if (!map) {
 514                 mutex_unlock(&acpi_ioremap_lock);
 515                 return;
 516         }
 517         acpi_os_drop_map_ref(map);
 518         mutex_unlock(&acpi_ioremap_lock);
 519
 520         acpi_os_map_cleanup(map);
 521 }
 522 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 523
 524 #ifdef ACPI_FUTURE_USAGE
 525 acpi_status
 526 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 527 {
 528         if (!phys || !virt)
 529                 return AE_BAD_PARAMETER;
 530
 531         *phys = virt_to_phys(virt);
 532
 533         return AE_OK;
 534 }
 535 #endif
 536
 537 #define ACPI_MAX_OVERRIDE_LEN 100
 538
 539 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 540
 541 acpi_status
 542 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 543                             acpi_string * new_val)
 544 {
 545         if (!init_val || !new_val)
 546                 return AE_BAD_PARAMETER;
 547
 548         *new_val = NULL;
 549         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 550                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 551                        acpi_os_name);
 552                 *new_val = acpi_os_name;
 553         }
 554
 555         return AE_OK;
 556 }
 557
 558 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 559 #include <linux/earlycpio.h>
 560 #include <linux/memblock.h>
 561
 562 static u64 acpi_tables_addr;
 563 static int all_tables_size;
 564
 565 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 566 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 567 {
 568         u8 sum = 0;
 569         u8 *end = buffer + length;
 570
 571         while (buffer < end)
 572                 sum = (u8) (sum + *(buffer++));
 573         return sum;
 574 }
 575
 576 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 577 static const char * const table_sigs[] = {
 578         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 579         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 580         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 581         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 582         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 583         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 584         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 585         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 586         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 587
 588 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 589
 590 #define ACPI_OVERRIDE_TABLES 64
 591 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
 592
 593 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 594
 595 void __init acpi_initrd_override(void *data, size_t size)
 596 {
 597         int sig, no, table_nr = 0, total_offset = 0;
 598         long offset = 0;
 599         struct acpi_table_header *table;
 600         char cpio_path[32] = "kernel/firmware/acpi/";
 601         struct cpio_data file;
 602
 603         if (data == NULL || size == 0)
 604                 return;
 605
 606         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 607                 file = find_cpio_data(cpio_path, data, size, &offset);
 608                 if (!file.data)
 609                         break;
 610
 611                 data += offset;
 612                 size -= offset;
 613
 614                 if (file.size < sizeof(struct acpi_table_header)) {
 615                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 616                                 cpio_path, file.name);
 617                         continue;
 618                 }
 619
 620                 table = file.data;
 621
 622                 for (sig = 0; table_sigs[sig]; sig++)
 623                         if (!memcmp(table->signature, table_sigs[sig], 4))
 624                                 break;
 625
 626                 if (!table_sigs[sig]) {
 627                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 628                                 cpio_path, file.name);
 629                         continue;
 630                 }
 631                 if (file.size != table->length) {
 632                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 633                                 cpio_path, file.name);
 634                         continue;
 635                 }
 636                 if (acpi_table_checksum(file.data, table->length)) {
 637                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 638                                 cpio_path, file.name);
 639                         continue;
 640                 }
 641
 642                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 643                         table->signature, cpio_path, file.name, table->length);
 644
 645                 all_tables_size += table->length;
 646                 acpi_initrd_files[table_nr].data = file.data;
 647                 acpi_initrd_files[table_nr].size = file.size;
 648                 table_nr++;
 649         }
 650         if (table_nr == 0)
 651                 return;
 652
 653         acpi_tables_addr =
 654                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 655                                        all_tables_size, PAGE_SIZE);
 656         if (!acpi_tables_addr) {
 657                 WARN_ON(1);
 658                 return;
 659         }
 660         /*
 661          * Only calling e820_add_reserve does not work and the
 662          * tables are invalid (memory got used) later.
 663          * memblock_reserve works as expected and the tables won't get modified.
 664          * But it's not enough on X86 because ioremap will
 665          * complain later (used by acpi_os_map_memory) that the pages
 666          * that should get mapped are not marked "reserved".
 667          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 668          * works fine.
 669          */
 670         memblock_reserve(acpi_tables_addr, all_tables_size);
 671         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 672
 673         /*
 674          * early_ioremap only can remap 256k one time. If we map all
 675          * tables one time, we will hit the limit. Need to map chunks
 676          * one by one during copying the same as that in relocate_initrd().
 677          */
 678         for (no = 0; no < table_nr; no++) {
 679                 unsigned char *src_p = acpi_initrd_files[no].data;
 680                 phys_addr_t size = acpi_initrd_files[no].size;
 681                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 682                 phys_addr_t slop, clen;
 683                 char *dest_p;
 684
 685                 total_offset += size;
 686
 687                 while (size) {
 688                         slop = dest_addr & ~PAGE_MASK;
 689                         clen = size;
 690                         if (clen > MAP_CHUNK_SIZE - slop)
 691                                 clen = MAP_CHUNK_SIZE - slop;
 692                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
 693                                                  clen + slop);
 694                         memcpy(dest_p + slop, src_p, clen);
 695                         early_iounmap(dest_p, clen + slop);
 696                         src_p += clen;
 697                         dest_addr += clen;
 698                         size -= clen;
 699                 }
 700         }
 701 }
 702 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 703
 704 static void acpi_table_taint(struct acpi_table_header *table)
 705 {
 706         pr_warn(PREFIX
 707                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 708                 table->signature, table->oem_table_id);
 709         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 710 }
 711
 712
 713 acpi_status
 714 acpi_os_table_override(struct acpi_table_header * existing_table,
 715                        struct acpi_table_header ** new_table)
 716 {
 717         if (!existing_table || !new_table)
 718                 return AE_BAD_PARAMETER;
 719
 720         *new_table = NULL;
 721
 722 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 723         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 724                 *new_table = (struct acpi_table_header *)AmlCode;
 725 #endif
 726         if (*new_table != NULL)
 727                 acpi_table_taint(existing_table);
 728         return AE_OK;
 729 }
 730
 731 acpi_status
 732 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 733                                 acpi_physical_address *address,
 734                                 u32 *table_length)
 735 {
 736 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 737         *table_length = 0;
 738         *address = 0;
 739         return AE_OK;
 740 #else
 741         int table_offset = 0;
 742         struct acpi_table_header *table;
 743
 744         *table_length = 0;
 745         *address = 0;
 746
 747         if (!acpi_tables_addr)
 748                 return AE_OK;
 749
 750         do {
 751                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 752                         WARN_ON(1);
 753                         return AE_OK;
 754                 }
 755
 756                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 757                                            ACPI_HEADER_SIZE);
 758
 759                 if (table_offset + table->length > all_tables_size) {
 760                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 761                         WARN_ON(1);
 762                         return AE_OK;
 763                 }
 764
 765                 table_offset += table->length;
 766
 767                 if (memcmp(existing_table->signature, table->signature, 4)) {
 768                         acpi_os_unmap_memory(table,
 769                                      ACPI_HEADER_SIZE);
 770                         continue;
 771                 }
 772
 773                 /* Only override tables with matching oem id */
 774                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 775                            ACPI_OEM_TABLE_ID_SIZE)) {
 776                         acpi_os_unmap_memory(table,
 777                                      ACPI_HEADER_SIZE);
 778                         continue;
 779                 }
 780
 781                 table_offset -= table->length;
 782                 *table_length = table->length;
 783                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 784                 *address = acpi_tables_addr + table_offset;
 785                 break;
 786         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 787
 788         if (*address != 0)
 789                 acpi_table_taint(existing_table);
 790         return AE_OK;
 791 #endif
 792 }
 793
 794 static irqreturn_t acpi_irq(int irq, void *dev_id)
 795 {
 796         u32 handled;
 797
 798         handled = (*acpi_irq_handler) (acpi_irq_context);
 799
 800         if (handled) {
 801                 acpi_irq_handled++;
 802                 return IRQ_HANDLED;
 803         } else {
 804                 acpi_irq_not_handled++;
 805                 return IRQ_NONE;
 806         }
 807 }
 808
 809 acpi_status
 810 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 811                                   void *context)
 812 {
 813         unsigned int irq;
 814
 815         acpi_irq_stats_init();
 816
 817         /*
 818          * ACPI interrupts different from the SCI in our copy of the FADT are
 819          * not supported.
 820          */
 821         if (gsi != acpi_gbl_FADT.sci_interrupt)
 822                 return AE_BAD_PARAMETER;
 823
 824         if (acpi_irq_handler)
 825                 return AE_ALREADY_ACQUIRED;
 826
 827         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 828                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 829                        gsi);
 830                 return AE_OK;
 831         }
 832
 833         acpi_irq_handler = handler;
 834         acpi_irq_context = context;
 835         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 836                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 837                 acpi_irq_handler = NULL;
 838                 return AE_NOT_ACQUIRED;
 839         }
 840
 841         return AE_OK;
 842 }
 843
 844 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 845 {
 846         if (irq != acpi_gbl_FADT.sci_interrupt)
 847                 return AE_BAD_PARAMETER;
 848
 849         free_irq(irq, acpi_irq);
 850         acpi_irq_handler = NULL;
 851
 852         return AE_OK;
 853 }
 854
 855 /*
 856  * Running in interpreter thread context, safe to sleep
 857  */
 858
 859 void acpi_os_sleep(u64 ms)
 860 {
 861         msleep(ms);
 862 }
 863
 864 void acpi_os_stall(u32 us)
 865 {
 866         while (us) {
 867                 u32 delay = 1000;
 868
 869                 if (delay > us)
 870                         delay = us;
 871                 udelay(delay);
 872                 touch_nmi_watchdog();
 873                 us -= delay;
 874         }
 875 }
 876
 877 /*
 878  * Support ACPI 3.0 AML Timer operand
 879  * Returns 64-bit free-running, monotonically increasing timer
 880  * with 100ns granularity
 881  */
 882 u64 acpi_os_get_timer(void)
 883 {
 884         u64 time_ns = ktime_to_ns(ktime_get());
 885         do_div(time_ns, 100);
 886         return time_ns;
 887 }
 888
 889 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 890 {
 891         u32 dummy;
 892
 893         if (!value)
 894                 value = &dummy;
 895
 896         *value = 0;
 897         if (width <= 8) {
 898                 *(u8 *) value = inb(port);
 899         } else if (width <= 16) {
 900                 *(u16 *) value = inw(port);
 901         } else if (width <= 32) {
 902                 *(u32 *) value = inl(port);
 903         } else {
 904                 BUG();
 905         }
 906
 907         return AE_OK;
 908 }
 909
 910 EXPORT_SYMBOL(acpi_os_read_port);
 911
 912 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 913 {
 914         if (width <= 8) {
 915                 outb(value, port);
 916         } else if (width <= 16) {
 917                 outw(value, port);
 918         } else if (width <= 32) {
 919                 outl(value, port);
 920         } else {
 921                 BUG();
 922         }
 923
 924         return AE_OK;
 925 }
 926
 927 EXPORT_SYMBOL(acpi_os_write_port);
 928
 929 #ifdef readq
 930 static inline u64 read64(const volatile void __iomem *addr)
 931 {
 932         return readq(addr);
 933 }
 934 #else
 935 static inline u64 read64(const volatile void __iomem *addr)
 936 {
 937         u64 l, h;
 938         l = readl(addr);
 939         h = readl(addr+4);
 940         return l | (h << 32);
 941 }
 942 #endif
 943
 944 acpi_status
 945 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 946 {
 947         void __iomem *virt_addr;
 948         unsigned int size = width / 8;
 949         bool unmap = false;
 950         u64 dummy;
 951
 952         rcu_read_lock();
 953         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 954         if (!virt_addr) {
 955                 rcu_read_unlock();
 956                 virt_addr = acpi_os_ioremap(phys_addr, size);
 957                 if (!virt_addr)
 958                         return AE_BAD_ADDRESS;
 959                 unmap = true;
 960         }
 961
 962         if (!value)
 963                 value = &dummy;
 964
 965         switch (width) {
 966         case 8:
 967                 *(u8 *) value = readb(virt_addr);
 968                 break;
 969         case 16:
 970                 *(u16 *) value = readw(virt_addr);
 971                 break;
 972         case 32:
 973                 *(u32 *) value = readl(virt_addr);
 974                 break;
 975         case 64:
 976                 *(u64 *) value = read64(virt_addr);
 977                 break;
 978         default:
 979                 BUG();
 980         }
 981
 982         if (unmap)
 983                 iounmap(virt_addr);
 984         else
 985                 rcu_read_unlock();
 986
 987         return AE_OK;
 988 }
 989
 990 #ifdef writeq
 991 static inline void write64(u64 val, volatile void __iomem *addr)
 992 {
 993         writeq(val, addr);
 994 }
 995 #else
 996 static inline void write64(u64 val, volatile void __iomem *addr)
 997 {
 998         writel(val, addr);
 999         writel(val>>32, addr+4);
1000 }
1001 #endif
1002
1003 acpi_status
1004 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
1005 {
1006         void __iomem *virt_addr;
1007         unsigned int size = width / 8;
1008         bool unmap = false;
1009
1010         rcu_read_lock();
1011         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1012         if (!virt_addr) {
1013                 rcu_read_unlock();
1014                 virt_addr = acpi_os_ioremap(phys_addr, size);
1015                 if (!virt_addr)
1016                         return AE_BAD_ADDRESS;
1017                 unmap = true;
1018         }
1019
1020         switch (width) {
1021         case 8:
1022                 writeb(value, virt_addr);
1023                 break;
1024         case 16:
1025                 writew(value, virt_addr);
1026                 break;
1027         case 32:
1028                 writel(value, virt_addr);
1029                 break;
1030         case 64:
1031                 write64(value, virt_addr);
1032                 break;
1033         default:
1034                 BUG();
1035         }
1036
1037         if (unmap)
1038                 iounmap(virt_addr);
1039         else
1040                 rcu_read_unlock();
1041
1042         return AE_OK;
1043 }
1044
1045 acpi_status
1046 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1047                                u64 *value, u32 width)
1048 {
1049         int result, size;
1050         u32 value32;
1051
1052         if (!value)
1053                 return AE_BAD_PARAMETER;
1054
1055         switch (width) {
1056         case 8:
1057                 size = 1;
1058                 break;
1059         case 16:
1060                 size = 2;
1061                 break;
1062         case 32:
1063                 size = 4;
1064                 break;
1065         default:
1066                 return AE_ERROR;
1067         }
1068
1069         result = raw_pci_read(pci_id->segment, pci_id->bus,
1070                                 PCI_DEVFN(pci_id->device, pci_id->function),
1071                                 reg, size, &value32);
1072         *value = value32;
1073
1074         return (result ? AE_ERROR : AE_OK);
1075 }
1076
1077 acpi_status
1078 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1079                                 u64 value, u32 width)
1080 {
1081         int result, size;
1082
1083         switch (width) {
1084         case 8:
1085                 size = 1;
1086                 break;
1087         case 16:
1088                 size = 2;
1089                 break;
1090         case 32:
1091                 size = 4;
1092                 break;
1093         default:
1094                 return AE_ERROR;
1095         }
1096
1097         result = raw_pci_write(pci_id->segment, pci_id->bus,
1098                                 PCI_DEVFN(pci_id->device, pci_id->function),
1099                                 reg, size, value);
1100
1101         return (result ? AE_ERROR : AE_OK);
1102 }
1103
1104 static void acpi_os_execute_deferred(struct work_struct *work)
1105 {
1106         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1107
1108         dpc->function(dpc->context);
1109         kfree(dpc);
1110 }
1111
1112 /*******************************************************************************
1113  *
1114  * FUNCTION:    acpi_os_execute
1115  *
1116  * PARAMETERS:  Type               - Type of the callback
1117  *              Function           - Function to be executed
1118  *              Context            - Function parameters
1119  *
1120  * RETURN:      Status
1121  *
1122  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1123  *              immediately executes function on a separate thread.
1124  *
1125  ******************************************************************************/
1126
1127 acpi_status acpi_os_execute(acpi_execute_type type,
1128                             acpi_osd_exec_callback function, void *context)
1129 {
1130         acpi_status status = AE_OK;
1131         struct acpi_os_dpc *dpc;
1132         struct workqueue_struct *queue;
1133         int ret;
1134         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1135                           "Scheduling function [%p(%p)] for deferred execution.\n",
1136                           function, context));
1137
1138         /*
1139          * Allocate/initialize DPC structure.  Note that this memory will be
1140          * freed by the callee.  The kernel handles the work_struct list  in a
1141          * way that allows us to also free its memory inside the callee.
1142          * Because we may want to schedule several tasks with different
1143          * parameters we can't use the approach some kernel code uses of
1144          * having a static work_struct.
1145          */
1146
1147         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1148         if (!dpc)
1149                 return AE_NO_MEMORY;
1150
1151         dpc->function = function;
1152         dpc->context = context;
1153
1154         /*
1155          * To prevent lockdep from complaining unnecessarily, make sure that
1156          * there is a different static lockdep key for each workqueue by using
1157          * INIT_WORK() for each of them separately.
1158          */
1159         if (type == OSL_NOTIFY_HANDLER) {
1160                 queue = kacpi_notify_wq;
1161                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1162         } else {
1163                 queue = kacpid_wq;
1164                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1165         }
1166
1167         /*
1168          * On some machines, a software-initiated SMI causes corruption unless
1169          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1170          * typically it's done in GPE-related methods that are run via
1171          * workqueues, so we can avoid the known corruption cases by always
1172          * queueing on CPU 0.
1173          */
1174         ret = queue_work_on(0, queue, &dpc->work);
1175
1176         if (!ret) {
1177                 printk(KERN_ERR PREFIX
1178                           "Call to queue_work() failed.\n");
1179                 status = AE_ERROR;
1180                 kfree(dpc);
1181         }
1182         return status;
1183 }
1184 EXPORT_SYMBOL(acpi_os_execute);
1185
1186 void acpi_os_wait_events_complete(void)
1187 {
1188         /*
1189          * Make sure the GPE handler or the fixed event handler is not used
1190          * on another CPU after removal.
1191          */
1192         if (acpi_irq_handler)
1193                 synchronize_hardirq(acpi_gbl_FADT.sci_interrupt);
1194         flush_workqueue(kacpid_wq);
1195         flush_workqueue(kacpi_notify_wq);
1196 }
1197
1198 struct acpi_hp_work {
1199         struct work_struct work;
1200         struct acpi_device *adev;
1201         u32 src;
1202 };
1203
1204 static void acpi_hotplug_work_fn(struct work_struct *work)
1205 {
1206         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1207
1208         acpi_os_wait_events_complete();
1209         acpi_device_hotplug(hpw->adev, hpw->src);
1210         kfree(hpw);
1211 }
1212
1213 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1214 {
1215         struct acpi_hp_work *hpw;
1216
1217         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1218                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1219                   adev, src));
1220
1221         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1222         if (!hpw)
1223                 return AE_NO_MEMORY;
1224
1225         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1226         hpw->adev = adev;
1227         hpw->src = src;
1228         /*
1229          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1230          * the hotplug code may call driver .remove() functions, which may
1231          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1232          * these workqueues.
1233          */
1234         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1235                 kfree(hpw);
1236                 return AE_ERROR;
1237         }
1238         return AE_OK;
1239 }
1240
1241 bool acpi_queue_hotplug_work(struct work_struct *work)
1242 {
1243         return queue_work(kacpi_hotplug_wq, work);
1244 }
1245
1246 acpi_status
1247 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1248 {
1249         struct semaphore *sem = NULL;
1250
1251         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1252         if (!sem)
1253                 return AE_NO_MEMORY;
1254
1255         sema_init(sem, initial_units);
1256
1257         *handle = (acpi_handle *) sem;
1258
1259         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1260                           *handle, initial_units));
1261
1262         return AE_OK;
1263 }
1264
1265 /*
1266  * TODO: A better way to delete semaphores?  Linux doesn't have a
1267  * 'delete_semaphore()' function -- may result in an invalid
1268  * pointer dereference for non-synchronized consumers.  Should
1269  * we at least check for blocked threads and signal/cancel them?
1270  */
1271
1272 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1273 {
1274         struct semaphore *sem = (struct semaphore *)handle;
1275
1276         if (!sem)
1277                 return AE_BAD_PARAMETER;
1278
1279         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1280
1281         BUG_ON(!list_empty(&sem->wait_list));
1282         kfree(sem);
1283         sem = NULL;
1284
1285         return AE_OK;
1286 }
1287
1288 /*
1289  * TODO: Support for units > 1?
1290  */
1291 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1292 {
1293         acpi_status status = AE_OK;
1294         struct semaphore *sem = (struct semaphore *)handle;
1295         long jiffies;
1296         int ret = 0;
1297
1298         if (!sem || (units < 1))
1299                 return AE_BAD_PARAMETER;
1300
1301         if (units > 1)
1302                 return AE_SUPPORT;
1303
1304         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1305                           handle, units, timeout));
1306
1307         if (timeout == ACPI_WAIT_FOREVER)
1308                 jiffies = MAX_SCHEDULE_TIMEOUT;
1309         else
1310                 jiffies = msecs_to_jiffies(timeout);
1311
1312         ret = down_timeout(sem, jiffies);
1313         if (ret)
1314                 status = AE_TIME;
1315
1316         if (ACPI_FAILURE(status)) {
1317                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1318                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1319                                   handle, units, timeout,
1320                                   acpi_format_exception(status)));
1321         } else {
1322                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1323                                   "Acquired semaphore[%p|%d|%d]", handle,
1324                                   units, timeout));
1325         }
1326
1327         return status;
1328 }
1329
1330 /*
1331  * TODO: Support for units > 1?
1332  */
1333 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1334 {
1335         struct semaphore *sem = (struct semaphore *)handle;
1336
1337         if (!sem || (units < 1))
1338                 return AE_BAD_PARAMETER;
1339
1340         if (units > 1)
1341                 return AE_SUPPORT;
1342
1343         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1344                           units));
1345
1346         up(sem);
1347
1348         return AE_OK;
1349 }
1350
1351 #ifdef ACPI_FUTURE_USAGE
1352 u32 acpi_os_get_line(char *buffer)
1353 {
1354
1355 #ifdef ENABLE_DEBUGGER
1356         if (acpi_in_debugger) {
1357                 u32 chars;
1358
1359                 kdb_read(buffer, sizeof(line_buf));
1360
1361                 /* remove the CR kdb includes */
1362                 chars = strlen(buffer) - 1;
1363                 buffer[chars] = '\0';
1364         }
1365 #endif
1366
1367         return 0;
1368 }
1369 #endif                          /*  ACPI_FUTURE_USAGE  */
1370
1371 acpi_status acpi_os_signal(u32 function, void *info)
1372 {
1373         switch (function) {
1374         case ACPI_SIGNAL_FATAL:
1375                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1376                 break;
1377         case ACPI_SIGNAL_BREAKPOINT:
1378                 /*
1379                  * AML Breakpoint
1380                  * ACPI spec. says to treat it as a NOP unless
1381                  * you are debugging.  So if/when we integrate
1382                  * AML debugger into the kernel debugger its
1383                  * hook will go here.  But until then it is
1384                  * not useful to print anything on breakpoints.
1385                  */
1386                 break;
1387         default:
1388                 break;
1389         }
1390
1391         return AE_OK;
1392 }
1393
1394 static int __init acpi_os_name_setup(char *str)
1395 {
1396         char *p = acpi_os_name;
1397         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1398
1399         if (!str || !*str)
1400                 return 0;
1401
1402         for (; count-- && *str; str++) {
1403                 if (isalnum(*str) || *str == ' ' || *str == ':')
1404                         *p++ = *str;
1405                 else if (*str == '\'' || *str == '"')
1406                         continue;
1407                 else
1408                         break;
1409         }
1410         *p = 0;
1411
1412         return 1;
1413
1414 }
1415
1416 __setup("acpi_os_name=", acpi_os_name_setup);
1417
1418 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1419 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1420
1421 struct osi_setup_entry {
1422         char string[OSI_STRING_LENGTH_MAX];
1423         bool enable;
1424 };
1425
1426 static struct osi_setup_entry
1427                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1428         {"Module Device", true},
1429         {"Processor Device", true},
1430         {"3.0 _SCP Extensions", true},
1431         {"Processor Aggregator Device", true},
1432 };
1433
1434 void __init acpi_osi_setup(char *str)
1435 {
1436         struct osi_setup_entry *osi;
1437         bool enable = true;
1438         int i;
1439
1440         if (!acpi_gbl_create_osi_method)
1441                 return;
1442
1443         if (str == NULL || *str == '\0') {
1444                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1445                 acpi_gbl_create_osi_method = FALSE;
1446                 return;
1447         }
1448
1449         if (*str == '!') {
1450                 str++;
1451                 if (*str == '\0') {
1452                         osi_linux.default_disabling = 1;
1453                         return;
1454                 } else if (*str == '*') {
1455                         acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1456                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1457                                 osi = &osi_setup_entries[i];
1458                                 osi->enable = false;
1459                         }
1460                         return;
1461                 }
1462                 enable = false;
1463         }
1464
1465         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1466                 osi = &osi_setup_entries[i];
1467                 if (!strcmp(osi->string, str)) {
1468                         osi->enable = enable;
1469                         break;
1470                 } else if (osi->string[0] == '\0') {
1471                         osi->enable = enable;
1472                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1473                         break;
1474                 }
1475         }
1476 }
1477
1478 static void __init set_osi_linux(unsigned int enable)
1479 {
1480         if (osi_linux.enable != enable)
1481                 osi_linux.enable = enable;
1482
1483         if (osi_linux.enable)
1484                 acpi_osi_setup("Linux");
1485         else
1486                 acpi_osi_setup("!Linux");
1487
1488         return;
1489 }
1490
1491 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1492 {
1493         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1494         osi_linux.dmi = 0;
1495         set_osi_linux(enable);
1496
1497         return;
1498 }
1499
1500 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1501 {
1502         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1503
1504         if (enable == -1)
1505                 return;
1506
1507         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1508         set_osi_linux(enable);
1509
1510         return;
1511 }
1512
1513 /*
1514  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1515  *
1516  * empty string disables _OSI
1517  * string starting with '!' disables that string
1518  * otherwise string is added to list, augmenting built-in strings
1519  */
1520 static void __init acpi_osi_setup_late(void)
1521 {
1522         struct osi_setup_entry *osi;
1523         char *str;
1524         int i;
1525         acpi_status status;
1526
1527         if (osi_linux.default_disabling) {
1528                 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1529
1530                 if (ACPI_SUCCESS(status))
1531                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1532         }
1533
1534         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1535                 osi = &osi_setup_entries[i];
1536                 str = osi->string;
1537
1538                 if (*str == '\0')
1539                         break;
1540                 if (osi->enable) {
1541                         status = acpi_install_interface(str);
1542
1543                         if (ACPI_SUCCESS(status))
1544                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1545                 } else {
1546                         status = acpi_remove_interface(str);
1547
1548                         if (ACPI_SUCCESS(status))
1549                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1550                 }
1551         }
1552 }
1553
1554 static int __init osi_setup(char *str)
1555 {
1556         if (str && !strcmp("Linux", str))
1557                 acpi_cmdline_osi_linux(1);
1558         else if (str && !strcmp("!Linux", str))
1559                 acpi_cmdline_osi_linux(0);
1560         else
1561                 acpi_osi_setup(str);
1562
1563         return 1;
1564 }
1565
1566 __setup("acpi_osi=", osi_setup);
1567
1568 /*
1569  * Disable the auto-serialization of named objects creation methods.
1570  *
1571  * This feature is enabled by default.  It marks the AML control methods
1572  * that contain the opcodes to create named objects as "Serialized".
1573  */
1574 static int __init acpi_no_auto_serialize_setup(char *str)
1575 {
1576         acpi_gbl_auto_serialize_methods = FALSE;
1577         pr_info("ACPI: auto-serialization disabled\n");
1578
1579         return 1;
1580 }
1581
1582 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1583
1584 /* Check of resource interference between native drivers and ACPI
1585  * OperationRegions (SystemIO and System Memory only).
1586  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1587  * in arbitrary AML code and can interfere with legacy drivers.
1588  * acpi_enforce_resources= can be set to:
1589  *
1590  *   - strict (default) (2)
1591  *     -> further driver trying to access the resources will not load
1592  *   - lax              (1)
1593  *     -> further driver trying to access the resources will load, but you
1594  *     get a system message that something might go wrong...
1595  *
1596  *   - no               (0)
1597  *     -> ACPI Operation Region resources will not be registered
1598  *
1599  */
1600 #define ENFORCE_RESOURCES_STRICT 2
1601 #define ENFORCE_RESOURCES_LAX    1
1602 #define ENFORCE_RESOURCES_NO     0
1603
1604 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1605
1606 static int __init acpi_enforce_resources_setup(char *str)
1607 {
1608         if (str == NULL || *str == '\0')
1609                 return 0;
1610
1611         if (!strcmp("strict", str))
1612                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1613         else if (!strcmp("lax", str))
1614                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1615         else if (!strcmp("no", str))
1616                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1617
1618         return 1;
1619 }
1620
1621 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1622
1623 /* Check for resource conflicts between ACPI OperationRegions and native
1624  * drivers */
1625 int acpi_check_resource_conflict(const struct resource *res)
1626 {
1627         acpi_adr_space_type space_id;
1628         acpi_size length;
1629         u8 warn = 0;
1630         int clash = 0;
1631
1632         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1633                 return 0;
1634         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1635                 return 0;
1636
1637         if (res->flags & IORESOURCE_IO)
1638                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1639         else
1640                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1641
1642         length = resource_size(res);
1643         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1644                 warn = 1;
1645         clash = acpi_check_address_range(space_id, res->start, length, warn);
1646
1647         if (clash) {
1648                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1649                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1650                                 printk(KERN_NOTICE "ACPI: This conflict may"
1651                                        " cause random problems and system"
1652                                        " instability\n");
1653                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1654                                " for this device, you should use it instead of"
1655                                " the native driver\n");
1656                 }
1657                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1658                         return -EBUSY;
1659         }
1660         return 0;
1661 }
1662 EXPORT_SYMBOL(acpi_check_resource_conflict);
1663
1664 int acpi_check_region(resource_size_t start, resource_size_t n,
1665                       const char *name)
1666 {
1667         struct resource res = {
1668                 .start = start,
1669                 .end   = start + n - 1,
1670                 .name  = name,
1671                 .flags = IORESOURCE_IO,
1672         };
1673
1674         return acpi_check_resource_conflict(&res);
1675 }
1676 EXPORT_SYMBOL(acpi_check_region);
1677
1678 /*
1679  * Let drivers know whether the resource checks are effective
1680  */
1681 int acpi_resources_are_enforced(void)
1682 {
1683         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1684 }
1685 EXPORT_SYMBOL(acpi_resources_are_enforced);
1686
1687 /*
1688  * Deallocate the memory for a spinlock.
1689  */
1690 void acpi_os_delete_lock(acpi_spinlock handle)
1691 {
1692         ACPI_FREE(handle);
1693 }
1694
1695 /*
1696  * Acquire a spinlock.
1697  *
1698  * handle is a pointer to the spinlock_t.
1699  */
1700
1701 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1702 {
1703         acpi_cpu_flags flags;
1704         spin_lock_irqsave(lockp, flags);
1705         return flags;
1706 }
1707
1708 /*
1709  * Release a spinlock. See above.
1710  */
1711
1712 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1713 {
1714         spin_unlock_irqrestore(lockp, flags);
1715 }
1716
1717 #ifndef ACPI_USE_LOCAL_CACHE
1718
1719 /*******************************************************************************
1720  *
1721  * FUNCTION:    acpi_os_create_cache
1722  *
1723  * PARAMETERS:  name      - Ascii name for the cache
1724  *              size      - Size of each cached object
1725  *              depth     - Maximum depth of the cache (in objects) <ignored>
1726  *              cache     - Where the new cache object is returned
1727  *
1728  * RETURN:      status
1729  *
1730  * DESCRIPTION: Create a cache object
1731  *
1732  ******************************************************************************/
1733
1734 acpi_status
1735 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1736 {
1737         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1738         if (*cache == NULL)
1739                 return AE_ERROR;
1740         else
1741                 return AE_OK;
1742 }
1743
1744 /*******************************************************************************
1745  *
1746  * FUNCTION:    acpi_os_purge_cache
1747  *
1748  * PARAMETERS:  Cache           - Handle to cache object
1749  *
1750  * RETURN:      Status
1751  *
1752  * DESCRIPTION: Free all objects within the requested cache.
1753  *
1754  ******************************************************************************/
1755
1756 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1757 {
1758         kmem_cache_shrink(cache);
1759         return (AE_OK);
1760 }
1761
1762 /*******************************************************************************
1763  *
1764  * FUNCTION:    acpi_os_delete_cache
1765  *
1766  * PARAMETERS:  Cache           - Handle to cache object
1767  *
1768  * RETURN:      Status
1769  *
1770  * DESCRIPTION: Free all objects within the requested cache and delete the
1771  *              cache object.
1772  *
1773  ******************************************************************************/
1774
1775 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1776 {
1777         kmem_cache_destroy(cache);
1778         return (AE_OK);
1779 }
1780
1781 /*******************************************************************************
1782  *
1783  * FUNCTION:    acpi_os_release_object
1784  *
1785  * PARAMETERS:  Cache       - Handle to cache object
1786  *              Object      - The object to be released
1787  *
1788  * RETURN:      None
1789  *
1790  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1791  *              the object is deleted.
1792  *
1793  ******************************************************************************/
1794
1795 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1796 {
1797         kmem_cache_free(cache, object);
1798         return (AE_OK);
1799 }
1800 #endif
1801
1802 static int __init acpi_no_static_ssdt_setup(char *s)
1803 {
1804         acpi_gbl_disable_ssdt_table_install = TRUE;
1805         pr_info("ACPI: static SSDT installation disabled\n");
1806
1807         return 0;
1808 }
1809
1810 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1811
1812 static int __init acpi_disable_return_repair(char *s)
1813 {
1814         printk(KERN_NOTICE PREFIX
1815                "ACPI: Predefined validation mechanism disabled\n");
1816         acpi_gbl_disable_auto_repair = TRUE;
1817
1818         return 1;
1819 }
1820
1821 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1822
1823 acpi_status __init acpi_os_initialize(void)
1824 {
1825         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1826         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1827         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1828         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1829         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1830                 /*
1831                  * Use acpi_os_map_generic_address to pre-map the reset
1832                  * register if it's in system memory.
1833                  */
1834                 int rv;
1835
1836                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1837                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1838         }
1839
1840         return AE_OK;
1841 }
1842
1843 acpi_status __init acpi_os_initialize1(void)
1844 {
1845         acpi_reserve_resources();
1846         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1847         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1848         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1849         BUG_ON(!kacpid_wq);
1850         BUG_ON(!kacpi_notify_wq);
1851         BUG_ON(!kacpi_hotplug_wq);
1852         acpi_install_interface_handler(acpi_osi_handler);
1853         acpi_osi_setup_late();
1854         return AE_OK;
1855 }
1856
1857 acpi_status acpi_os_terminate(void)
1858 {
1859         if (acpi_irq_handler) {
1860                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1861                                                  acpi_irq_handler);
1862         }
1863
1864         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1865         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1866         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1867         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1868         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1869                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1870
1871         destroy_workqueue(kacpid_wq);
1872         destroy_workqueue(kacpi_notify_wq);
1873         destroy_workqueue(kacpi_hotplug_wq);
1874
1875         return AE_OK;
1876 }
1877
1878 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1879                                   u32 pm1b_control)
1880 {
1881         int rc = 0;
1882         if (__acpi_os_prepare_sleep)
1883                 rc = __acpi_os_prepare_sleep(sleep_state,
1884                                              pm1a_control, pm1b_control);
1885         if (rc < 0)
1886                 return AE_ERROR;
1887         else if (rc > 0)
1888                 return AE_CTRL_SKIP;
1889
1890         return AE_OK;
1891 }
1892
1893 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1894                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1895 {
1896         __acpi_os_prepare_sleep = func;
1897 }
1898
1899 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1900                                   u32 val_b)
1901 {
1902         int rc = 0;
1903         if (__acpi_os_prepare_extended_sleep)
1904                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1905                                              val_a, val_b);
1906         if (rc < 0)
1907                 return AE_ERROR;
1908         else if (rc > 0)
1909                 return AE_CTRL_SKIP;
1910
1911         return AE_OK;
1912 }
1913
1914 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1915                                u32 val_a, u32 val_b))
1916 {
1917         __acpi_os_prepare_extended_sleep = func;
1918 }