kernel/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 int __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         return 0;
 216 }
 217 fs_initcall_sync(acpi_reserve_resources);
 218
 219 void acpi_os_printf(const char *fmt, ...)
 220 {
 221         va_list args;
 222         va_start(args, fmt);
 223         acpi_os_vprintf(fmt, args);
 224         va_end(args);
 225 }
 226
 227 void acpi_os_vprintf(const char *fmt, va_list args)
 228 {
 229         static char buffer[512];
 230
 231         vsprintf(buffer, fmt, args);
 232
 233 #ifdef ENABLE_DEBUGGER
 234         if (acpi_in_debugger) {
 235                 kdb_printf("%s", buffer);
 236         } else {
 237                 printk(KERN_CONT "%s", buffer);
 238         }
 239 #else
 240         printk(KERN_CONT "%s", buffer);
 241 #endif
 242 }
 243
 244 #ifdef CONFIG_KEXEC
 245 static unsigned long acpi_rsdp;
 246 static int __init setup_acpi_rsdp(char *arg)
 247 {
 248         if (kstrtoul(arg, 16, &acpi_rsdp))
 249                 return -EINVAL;
 250         return 0;
 251 }
 252 early_param("acpi_rsdp", setup_acpi_rsdp);
 253 #endif
 254
 255 acpi_physical_address __init acpi_os_get_root_pointer(void)
 256 {
 257 #ifdef CONFIG_KEXEC
 258         if (acpi_rsdp)
 259                 return acpi_rsdp;
 260 #endif
 261
 262         if (efi_enabled(EFI_CONFIG_TABLES)) {
 263                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 264                         return efi.acpi20;
 265                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 266                         return efi.acpi;
 267                 else {
 268                         printk(KERN_ERR PREFIX
 269                                "System description tables not found\n");
 270                         return 0;
 271                 }
 272         } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 273                 acpi_physical_address pa = 0;
 274
 275                 acpi_find_root_pointer(&pa);
 276                 return pa;
 277         }
 278
 279         return 0;
 280 }
 281
 282 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 283 static struct acpi_ioremap *
 284 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 285 {
 286         struct acpi_ioremap *map;
 287
 288         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 289                 if (map->phys <= phys &&
 290                     phys + size <= map->phys + map->size)
 291                         return map;
 292
 293         return NULL;
 294 }
 295
 296 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 297 static void __iomem *
 298 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 299 {
 300         struct acpi_ioremap *map;
 301
 302         map = acpi_map_lookup(phys, size);
 303         if (map)
 304                 return map->virt + (phys - map->phys);
 305
 306         return NULL;
 307 }
 308
 309 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 310 {
 311         struct acpi_ioremap *map;
 312         void __iomem *virt = NULL;
 313
 314         mutex_lock(&acpi_ioremap_lock);
 315         map = acpi_map_lookup(phys, size);
 316         if (map) {
 317                 virt = map->virt + (phys - map->phys);
 318                 map->refcount++;
 319         }
 320         mutex_unlock(&acpi_ioremap_lock);
 321         return virt;
 322 }
 323 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 324
 325 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 326 static struct acpi_ioremap *
 327 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 328 {
 329         struct acpi_ioremap *map;
 330
 331         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 332                 if (map->virt <= virt &&
 333                     virt + size <= map->virt + map->size)
 334                         return map;
 335
 336         return NULL;
 337 }
 338
 339 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
 340 /* ioremap will take care of cache attributes */
 341 #define should_use_kmap(pfn)   0
 342 #else
 343 #define should_use_kmap(pfn)   page_is_ram(pfn)
 344 #endif
 345
 346 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 347 {
 348         unsigned long pfn;
 349
 350         pfn = pg_off >> PAGE_SHIFT;
 351         if (should_use_kmap(pfn)) {
 352                 if (pg_sz > PAGE_SIZE)
 353                         return NULL;
 354                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 355         } else
 356                 return acpi_os_ioremap(pg_off, pg_sz);
 357 }
 358
 359 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 360 {
 361         unsigned long pfn;
 362
 363         pfn = pg_off >> PAGE_SHIFT;
 364         if (should_use_kmap(pfn))
 365                 kunmap(pfn_to_page(pfn));
 366         else
 367                 iounmap(vaddr);
 368 }
 369
 370 void __iomem *__init_refok
 371 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 372 {
 373         struct acpi_ioremap *map;
 374         void __iomem *virt;
 375         acpi_physical_address pg_off;
 376         acpi_size pg_sz;
 377
 378         if (phys > ULONG_MAX) {
 379                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 380                 return NULL;
 381         }
 382
 383         if (!acpi_gbl_permanent_mmap)
 384                 return __acpi_map_table((unsigned long)phys, size);
 385
 386         mutex_lock(&acpi_ioremap_lock);
 387         /* Check if there's a suitable mapping already. */
 388         map = acpi_map_lookup(phys, size);
 389         if (map) {
 390                 map->refcount++;
 391                 goto out;
 392         }
 393
 394         map = kzalloc(sizeof(*map), GFP_KERNEL);
 395         if (!map) {
 396                 mutex_unlock(&acpi_ioremap_lock);
 397                 return NULL;
 398         }
 399
 400         pg_off = round_down(phys, PAGE_SIZE);
 401         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 402         virt = acpi_map(pg_off, pg_sz);
 403         if (!virt) {
 404                 mutex_unlock(&acpi_ioremap_lock);
 405                 kfree(map);
 406                 return NULL;
 407         }
 408
 409         INIT_LIST_HEAD(&map->list);
 410         map->virt = virt;
 411         map->phys = pg_off;
 412         map->size = pg_sz;
 413         map->refcount = 1;
 414
 415         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 416
 417 out:
 418         mutex_unlock(&acpi_ioremap_lock);
 419         return map->virt + (phys - map->phys);
 420 }
 421 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 422
 423 void *__init_refok
 424 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 425 {
 426         return (void *)acpi_os_map_iomem(phys, size);
 427 }
 428 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 429
 430 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 431 {
 432         if (!--map->refcount)
 433                 list_del_rcu(&map->list);
 434 }
 435
 436 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 437 {
 438         if (!map->refcount) {
 439                 synchronize_rcu_expedited();
 440                 acpi_unmap(map->phys, map->virt);
 441                 kfree(map);
 442         }
 443 }
 444
 445 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 446 {
 447         struct acpi_ioremap *map;
 448
 449         if (!acpi_gbl_permanent_mmap) {
 450                 __acpi_unmap_table(virt, size);
 451                 return;
 452         }
 453
 454         mutex_lock(&acpi_ioremap_lock);
 455         map = acpi_map_lookup_virt(virt, size);
 456         if (!map) {
 457                 mutex_unlock(&acpi_ioremap_lock);
 458                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 459                 return;
 460         }
 461         acpi_os_drop_map_ref(map);
 462         mutex_unlock(&acpi_ioremap_lock);
 463
 464         acpi_os_map_cleanup(map);
 465 }
 466 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 467
 468 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 469 {
 470         return acpi_os_unmap_iomem((void __iomem *)virt, size);
 471 }
 472 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 473
 474 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 475 {
 476         if (!acpi_gbl_permanent_mmap)
 477                 __acpi_unmap_table(virt, size);
 478 }
 479
 480 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 481 {
 482         u64 addr;
 483         void __iomem *virt;
 484
 485         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 486                 return 0;
 487
 488         /* Handle possible alignment issues */
 489         memcpy(&addr, &gas->address, sizeof(addr));
 490         if (!addr || !gas->bit_width)
 491                 return -EINVAL;
 492
 493         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 494         if (!virt)
 495                 return -EIO;
 496
 497         return 0;
 498 }
 499 EXPORT_SYMBOL(acpi_os_map_generic_address);
 500
 501 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 502 {
 503         u64 addr;
 504         struct acpi_ioremap *map;
 505
 506         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 507                 return;
 508
 509         /* Handle possible alignment issues */
 510         memcpy(&addr, &gas->address, sizeof(addr));
 511         if (!addr || !gas->bit_width)
 512                 return;
 513
 514         mutex_lock(&acpi_ioremap_lock);
 515         map = acpi_map_lookup(addr, gas->bit_width / 8);
 516         if (!map) {
 517                 mutex_unlock(&acpi_ioremap_lock);
 518                 return;
 519         }
 520         acpi_os_drop_map_ref(map);
 521         mutex_unlock(&acpi_ioremap_lock);
 522
 523         acpi_os_map_cleanup(map);
 524 }
 525 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 526
 527 #ifdef ACPI_FUTURE_USAGE
 528 acpi_status
 529 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 530 {
 531         if (!phys || !virt)
 532                 return AE_BAD_PARAMETER;
 533
 534         *phys = virt_to_phys(virt);
 535
 536         return AE_OK;
 537 }
 538 #endif
 539
 540 #define ACPI_MAX_OVERRIDE_LEN 100
 541
 542 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 543
 544 acpi_status
 545 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 546                             acpi_string * new_val)
 547 {
 548         if (!init_val || !new_val)
 549                 return AE_BAD_PARAMETER;
 550
 551         *new_val = NULL;
 552         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 553                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 554                        acpi_os_name);
 555                 *new_val = acpi_os_name;
 556         }
 557
 558         return AE_OK;
 559 }
 560
 561 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 562 #include <linux/earlycpio.h>
 563 #include <linux/memblock.h>
 564
 565 static u64 acpi_tables_addr;
 566 static int all_tables_size;
 567
 568 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 569 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 570 {
 571         u8 sum = 0;
 572         u8 *end = buffer + length;
 573
 574         while (buffer < end)
 575                 sum = (u8) (sum + *(buffer++));
 576         return sum;
 577 }
 578
 579 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 580 static const char * const table_sigs[] = {
 581         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 582         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 583         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 584         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 585         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 586         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 587         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 588         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 589         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 590
 591 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 592
 593 #define ACPI_OVERRIDE_TABLES 64
 594 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
 595
 596 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 597
 598 void __init acpi_initrd_override(void *data, size_t size)
 599 {
 600         int sig, no, table_nr = 0, total_offset = 0;
 601         long offset = 0;
 602         struct acpi_table_header *table;
 603         char cpio_path[32] = "kernel/firmware/acpi/";
 604         struct cpio_data file;
 605
 606         if (data == NULL || size == 0)
 607                 return;
 608
 609         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 610                 file = find_cpio_data(cpio_path, data, size, &offset);
 611                 if (!file.data)
 612                         break;
 613
 614                 data += offset;
 615                 size -= offset;
 616
 617                 if (file.size < sizeof(struct acpi_table_header)) {
 618                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 619                                 cpio_path, file.name);
 620                         continue;
 621                 }
 622
 623                 table = file.data;
 624
 625                 for (sig = 0; table_sigs[sig]; sig++)
 626                         if (!memcmp(table->signature, table_sigs[sig], 4))
 627                                 break;
 628
 629                 if (!table_sigs[sig]) {
 630                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 631                                 cpio_path, file.name);
 632                         continue;
 633                 }
 634                 if (file.size != table->length) {
 635                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 636                                 cpio_path, file.name);
 637                         continue;
 638                 }
 639                 if (acpi_table_checksum(file.data, table->length)) {
 640                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 641                                 cpio_path, file.name);
 642                         continue;
 643                 }
 644
 645                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 646                         table->signature, cpio_path, file.name, table->length);
 647
 648                 all_tables_size += table->length;
 649                 acpi_initrd_files[table_nr].data = file.data;
 650                 acpi_initrd_files[table_nr].size = file.size;
 651                 table_nr++;
 652         }
 653         if (table_nr == 0)
 654                 return;
 655
 656         acpi_tables_addr =
 657                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 658                                        all_tables_size, PAGE_SIZE);
 659         if (!acpi_tables_addr) {
 660                 WARN_ON(1);
 661                 return;
 662         }
 663         /*
 664          * Only calling e820_add_reserve does not work and the
 665          * tables are invalid (memory got used) later.
 666          * memblock_reserve works as expected and the tables won't get modified.
 667          * But it's not enough on X86 because ioremap will
 668          * complain later (used by acpi_os_map_memory) that the pages
 669          * that should get mapped are not marked "reserved".
 670          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 671          * works fine.
 672          */
 673         memblock_reserve(acpi_tables_addr, all_tables_size);
 674         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 675
 676         /*
 677          * early_ioremap only can remap 256k one time. If we map all
 678          * tables one time, we will hit the limit. Need to map chunks
 679          * one by one during copying the same as that in relocate_initrd().
 680          */
 681         for (no = 0; no < table_nr; no++) {
 682                 unsigned char *src_p = acpi_initrd_files[no].data;
 683                 phys_addr_t size = acpi_initrd_files[no].size;
 684                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 685                 phys_addr_t slop, clen;
 686                 char *dest_p;
 687
 688                 total_offset += size;
 689
 690                 while (size) {
 691                         slop = dest_addr & ~PAGE_MASK;
 692                         clen = size;
 693                         if (clen > MAP_CHUNK_SIZE - slop)
 694                                 clen = MAP_CHUNK_SIZE - slop;
 695                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
 696                                                  clen + slop);
 697                         memcpy(dest_p + slop, src_p, clen);
 698                         early_iounmap(dest_p, clen + slop);
 699                         src_p += clen;
 700                         dest_addr += clen;
 701                         size -= clen;
 702                 }
 703         }
 704 }
 705 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 706
 707 static void acpi_table_taint(struct acpi_table_header *table)
 708 {
 709         pr_warn(PREFIX
 710                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 711                 table->signature, table->oem_table_id);
 712         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 713 }
 714
 715
 716 acpi_status
 717 acpi_os_table_override(struct acpi_table_header * existing_table,
 718                        struct acpi_table_header ** new_table)
 719 {
 720         if (!existing_table || !new_table)
 721                 return AE_BAD_PARAMETER;
 722
 723         *new_table = NULL;
 724
 725 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 726         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 727                 *new_table = (struct acpi_table_header *)AmlCode;
 728 #endif
 729         if (*new_table != NULL)
 730                 acpi_table_taint(existing_table);
 731         return AE_OK;
 732 }
 733
 734 acpi_status
 735 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 736                                 acpi_physical_address *address,
 737                                 u32 *table_length)
 738 {
 739 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 740         *table_length = 0;
 741         *address = 0;
 742         return AE_OK;
 743 #else
 744         int table_offset = 0;
 745         struct acpi_table_header *table;
 746
 747         *table_length = 0;
 748         *address = 0;
 749
 750         if (!acpi_tables_addr)
 751                 return AE_OK;
 752
 753         do {
 754                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 755                         WARN_ON(1);
 756                         return AE_OK;
 757                 }
 758
 759                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 760                                            ACPI_HEADER_SIZE);
 761
 762                 if (table_offset + table->length > all_tables_size) {
 763                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 764                         WARN_ON(1);
 765                         return AE_OK;
 766                 }
 767
 768                 table_offset += table->length;
 769
 770                 if (memcmp(existing_table->signature, table->signature, 4)) {
 771                         acpi_os_unmap_memory(table,
 772                                      ACPI_HEADER_SIZE);
 773                         continue;
 774                 }
 775
 776                 /* Only override tables with matching oem id */
 777                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 778                            ACPI_OEM_TABLE_ID_SIZE)) {
 779                         acpi_os_unmap_memory(table,
 780                                      ACPI_HEADER_SIZE);
 781                         continue;
 782                 }
 783
 784                 table_offset -= table->length;
 785                 *table_length = table->length;
 786                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 787                 *address = acpi_tables_addr + table_offset;
 788                 break;
 789         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 790
 791         if (*address != 0)
 792                 acpi_table_taint(existing_table);
 793         return AE_OK;
 794 #endif
 795 }
 796
 797 static irqreturn_t acpi_irq(int irq, void *dev_id)
 798 {
 799         u32 handled;
 800
 801         handled = (*acpi_irq_handler) (acpi_irq_context);
 802
 803         if (handled) {
 804                 acpi_irq_handled++;
 805                 return IRQ_HANDLED;
 806         } else {
 807                 acpi_irq_not_handled++;
 808                 return IRQ_NONE;
 809         }
 810 }
 811
 812 acpi_status
 813 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 814                                   void *context)
 815 {
 816         unsigned int irq;
 817
 818         acpi_irq_stats_init();
 819
 820         /*
 821          * ACPI interrupts different from the SCI in our copy of the FADT are
 822          * not supported.
 823          */
 824         if (gsi != acpi_gbl_FADT.sci_interrupt)
 825                 return AE_BAD_PARAMETER;
 826
 827         if (acpi_irq_handler)
 828                 return AE_ALREADY_ACQUIRED;
 829
 830         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 831                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 832                        gsi);
 833                 return AE_OK;
 834         }
 835
 836         acpi_irq_handler = handler;
 837         acpi_irq_context = context;
 838         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 839                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 840                 acpi_irq_handler = NULL;
 841                 return AE_NOT_ACQUIRED;
 842         }
 843
 844         return AE_OK;
 845 }
 846
 847 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 848 {
 849         if (irq != acpi_gbl_FADT.sci_interrupt)
 850                 return AE_BAD_PARAMETER;
 851
 852         free_irq(irq, acpi_irq);
 853         acpi_irq_handler = NULL;
 854
 855         return AE_OK;
 856 }
 857
 858 /*
 859  * Running in interpreter thread context, safe to sleep
 860  */
 861
 862 void acpi_os_sleep(u64 ms)
 863 {
 864         msleep(ms);
 865 }
 866
 867 void acpi_os_stall(u32 us)
 868 {
 869         while (us) {
 870                 u32 delay = 1000;
 871
 872                 if (delay > us)
 873                         delay = us;
 874                 udelay(delay);
 875                 touch_nmi_watchdog();
 876                 us -= delay;
 877         }
 878 }
 879
 880 /*
 881  * Support ACPI 3.0 AML Timer operand
 882  * Returns 64-bit free-running, monotonically increasing timer
 883  * with 100ns granularity
 884  */
 885 u64 acpi_os_get_timer(void)
 886 {
 887         u64 time_ns = ktime_to_ns(ktime_get());
 888         do_div(time_ns, 100);
 889         return time_ns;
 890 }
 891
 892 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 893 {
 894         u32 dummy;
 895
 896         if (!value)
 897                 value = &dummy;
 898
 899         *value = 0;
 900         if (width <= 8) {
 901                 *(u8 *) value = inb(port);
 902         } else if (width <= 16) {
 903                 *(u16 *) value = inw(port);
 904         } else if (width <= 32) {
 905                 *(u32 *) value = inl(port);
 906         } else {
 907                 BUG();
 908         }
 909
 910         return AE_OK;
 911 }
 912
 913 EXPORT_SYMBOL(acpi_os_read_port);
 914
 915 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 916 {
 917         if (width <= 8) {
 918                 outb(value, port);
 919         } else if (width <= 16) {
 920                 outw(value, port);
 921         } else if (width <= 32) {
 922                 outl(value, port);
 923         } else {
 924                 BUG();
 925         }
 926
 927         return AE_OK;
 928 }
 929
 930 EXPORT_SYMBOL(acpi_os_write_port);
 931
 932 #ifdef readq
 933 static inline u64 read64(const volatile void __iomem *addr)
 934 {
 935         return readq(addr);
 936 }
 937 #else
 938 static inline u64 read64(const volatile void __iomem *addr)
 939 {
 940         u64 l, h;
 941         l = readl(addr);
 942         h = readl(addr+4);
 943         return l | (h << 32);
 944 }
 945 #endif
 946
 947 acpi_status
 948 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 949 {
 950         void __iomem *virt_addr;
 951         unsigned int size = width / 8;
 952         bool unmap = false;
 953         u64 dummy;
 954
 955         rcu_read_lock();
 956         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 957         if (!virt_addr) {
 958                 rcu_read_unlock();
 959                 virt_addr = acpi_os_ioremap(phys_addr, size);
 960                 if (!virt_addr)
 961                         return AE_BAD_ADDRESS;
 962                 unmap = true;
 963         }
 964
 965         if (!value)
 966                 value = &dummy;
 967
 968         switch (width) {
 969         case 8:
 970                 *(u8 *) value = readb(virt_addr);
 971                 break;
 972         case 16:
 973                 *(u16 *) value = readw(virt_addr);
 974                 break;
 975         case 32:
 976                 *(u32 *) value = readl(virt_addr);
 977                 break;
 978         case 64:
 979                 *(u64 *) value = read64(virt_addr);
 980                 break;
 981         default:
 982                 BUG();
 983         }
 984
 985         if (unmap)
 986                 iounmap(virt_addr);
 987         else
 988                 rcu_read_unlock();
 989
 990         return AE_OK;
 991 }
 992
 993 #ifdef writeq
 994 static inline void write64(u64 val, volatile void __iomem *addr)
 995 {
 996         writeq(val, addr);
 997 }
 998 #else
 999 static inline void write64(u64 val, volatile void __iomem *addr)
1000 {
1001         writel(val, addr);
1002         writel(val>>32, addr+4);
1003 }
1004 #endif
1005
1006 acpi_status
1007 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
1008 {
1009         void __iomem *virt_addr;
1010         unsigned int size = width / 8;
1011         bool unmap = false;
1012
1013         rcu_read_lock();
1014         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1015         if (!virt_addr) {
1016                 rcu_read_unlock();
1017                 virt_addr = acpi_os_ioremap(phys_addr, size);
1018                 if (!virt_addr)
1019                         return AE_BAD_ADDRESS;
1020                 unmap = true;
1021         }
1022
1023         switch (width) {
1024         case 8:
1025                 writeb(value, virt_addr);
1026                 break;
1027         case 16:
1028                 writew(value, virt_addr);
1029                 break;
1030         case 32:
1031                 writel(value, virt_addr);
1032                 break;
1033         case 64:
1034                 write64(value, virt_addr);
1035                 break;
1036         default:
1037                 BUG();
1038         }
1039
1040         if (unmap)
1041                 iounmap(virt_addr);
1042         else
1043                 rcu_read_unlock();
1044
1045         return AE_OK;
1046 }
1047
1048 acpi_status
1049 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1050                                u64 *value, u32 width)
1051 {
1052         int result, size;
1053         u32 value32;
1054
1055         if (!value)
1056                 return AE_BAD_PARAMETER;
1057
1058         switch (width) {
1059         case 8:
1060                 size = 1;
1061                 break;
1062         case 16:
1063                 size = 2;
1064                 break;
1065         case 32:
1066                 size = 4;
1067                 break;
1068         default:
1069                 return AE_ERROR;
1070         }
1071
1072         result = raw_pci_read(pci_id->segment, pci_id->bus,
1073                                 PCI_DEVFN(pci_id->device, pci_id->function),
1074                                 reg, size, &value32);
1075         *value = value32;
1076
1077         return (result ? AE_ERROR : AE_OK);
1078 }
1079
1080 acpi_status
1081 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1082                                 u64 value, u32 width)
1083 {
1084         int result, size;
1085
1086         switch (width) {
1087         case 8:
1088                 size = 1;
1089                 break;
1090         case 16:
1091                 size = 2;
1092                 break;
1093         case 32:
1094                 size = 4;
1095                 break;
1096         default:
1097                 return AE_ERROR;
1098         }
1099
1100         result = raw_pci_write(pci_id->segment, pci_id->bus,
1101                                 PCI_DEVFN(pci_id->device, pci_id->function),
1102                                 reg, size, value);
1103
1104         return (result ? AE_ERROR : AE_OK);
1105 }
1106
1107 static void acpi_os_execute_deferred(struct work_struct *work)
1108 {
1109         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1110
1111         dpc->function(dpc->context);
1112         kfree(dpc);
1113 }
1114
1115 /*******************************************************************************
1116  *
1117  * FUNCTION:    acpi_os_execute
1118  *
1119  * PARAMETERS:  Type               - Type of the callback
1120  *              Function           - Function to be executed
1121  *              Context            - Function parameters
1122  *
1123  * RETURN:      Status
1124  *
1125  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1126  *              immediately executes function on a separate thread.
1127  *
1128  ******************************************************************************/
1129
1130 acpi_status acpi_os_execute(acpi_execute_type type,
1131                             acpi_osd_exec_callback function, void *context)
1132 {
1133         acpi_status status = AE_OK;
1134         struct acpi_os_dpc *dpc;
1135         struct workqueue_struct *queue;
1136         int ret;
1137         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1138                           "Scheduling function [%p(%p)] for deferred execution.\n",
1139                           function, context));
1140
1141         /*
1142          * Allocate/initialize DPC structure.  Note that this memory will be
1143          * freed by the callee.  The kernel handles the work_struct list  in a
1144          * way that allows us to also free its memory inside the callee.
1145          * Because we may want to schedule several tasks with different
1146          * parameters we can't use the approach some kernel code uses of
1147          * having a static work_struct.
1148          */
1149
1150         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1151         if (!dpc)
1152                 return AE_NO_MEMORY;
1153
1154         dpc->function = function;
1155         dpc->context = context;
1156
1157         /*
1158          * To prevent lockdep from complaining unnecessarily, make sure that
1159          * there is a different static lockdep key for each workqueue by using
1160          * INIT_WORK() for each of them separately.
1161          */
1162         if (type == OSL_NOTIFY_HANDLER) {
1163                 queue = kacpi_notify_wq;
1164                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1165         } else {
1166                 queue = kacpid_wq;
1167                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1168         }
1169
1170         /*
1171          * On some machines, a software-initiated SMI causes corruption unless
1172          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1173          * typically it's done in GPE-related methods that are run via
1174          * workqueues, so we can avoid the known corruption cases by always
1175          * queueing on CPU 0.
1176          */
1177         ret = queue_work_on(0, queue, &dpc->work);
1178
1179         if (!ret) {
1180                 printk(KERN_ERR PREFIX
1181                           "Call to queue_work() failed.\n");
1182                 status = AE_ERROR;
1183                 kfree(dpc);
1184         }
1185         return status;
1186 }
1187 EXPORT_SYMBOL(acpi_os_execute);
1188
1189 void acpi_os_wait_events_complete(void)
1190 {
1191         /*
1192          * Make sure the GPE handler or the fixed event handler is not used
1193          * on another CPU after removal.
1194          */
1195         if (acpi_irq_handler)
1196                 synchronize_hardirq(acpi_gbl_FADT.sci_interrupt);
1197         flush_workqueue(kacpid_wq);
1198         flush_workqueue(kacpi_notify_wq);
1199 }
1200
1201 struct acpi_hp_work {
1202         struct work_struct work;
1203         struct acpi_device *adev;
1204         u32 src;
1205 };
1206
1207 static void acpi_hotplug_work_fn(struct work_struct *work)
1208 {
1209         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1210
1211         acpi_os_wait_events_complete();
1212         acpi_device_hotplug(hpw->adev, hpw->src);
1213         kfree(hpw);
1214 }
1215
1216 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1217 {
1218         struct acpi_hp_work *hpw;
1219
1220         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1221                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1222                   adev, src));
1223
1224         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1225         if (!hpw)
1226                 return AE_NO_MEMORY;
1227
1228         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1229         hpw->adev = adev;
1230         hpw->src = src;
1231         /*
1232          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1233          * the hotplug code may call driver .remove() functions, which may
1234          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1235          * these workqueues.
1236          */
1237         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1238                 kfree(hpw);
1239                 return AE_ERROR;
1240         }
1241         return AE_OK;
1242 }
1243
1244 bool acpi_queue_hotplug_work(struct work_struct *work)
1245 {
1246         return queue_work(kacpi_hotplug_wq, work);
1247 }
1248
1249 acpi_status
1250 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1251 {
1252         struct semaphore *sem = NULL;
1253
1254         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1255         if (!sem)
1256                 return AE_NO_MEMORY;
1257
1258         sema_init(sem, initial_units);
1259
1260         *handle = (acpi_handle *) sem;
1261
1262         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1263                           *handle, initial_units));
1264
1265         return AE_OK;
1266 }
1267
1268 /*
1269  * TODO: A better way to delete semaphores?  Linux doesn't have a
1270  * 'delete_semaphore()' function -- may result in an invalid
1271  * pointer dereference for non-synchronized consumers.  Should
1272  * we at least check for blocked threads and signal/cancel them?
1273  */
1274
1275 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1276 {
1277         struct semaphore *sem = (struct semaphore *)handle;
1278
1279         if (!sem)
1280                 return AE_BAD_PARAMETER;
1281
1282         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1283
1284         BUG_ON(!list_empty(&sem->wait_list));
1285         kfree(sem);
1286         sem = NULL;
1287
1288         return AE_OK;
1289 }
1290
1291 /*
1292  * TODO: Support for units > 1?
1293  */
1294 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1295 {
1296         acpi_status status = AE_OK;
1297         struct semaphore *sem = (struct semaphore *)handle;
1298         long jiffies;
1299         int ret = 0;
1300
1301         if (!sem || (units < 1))
1302                 return AE_BAD_PARAMETER;
1303
1304         if (units > 1)
1305                 return AE_SUPPORT;
1306
1307         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1308                           handle, units, timeout));
1309
1310         if (timeout == ACPI_WAIT_FOREVER)
1311                 jiffies = MAX_SCHEDULE_TIMEOUT;
1312         else
1313                 jiffies = msecs_to_jiffies(timeout);
1314
1315         ret = down_timeout(sem, jiffies);
1316         if (ret)
1317                 status = AE_TIME;
1318
1319         if (ACPI_FAILURE(status)) {
1320                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1321                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1322                                   handle, units, timeout,
1323                                   acpi_format_exception(status)));
1324         } else {
1325                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1326                                   "Acquired semaphore[%p|%d|%d]", handle,
1327                                   units, timeout));
1328         }
1329
1330         return status;
1331 }
1332
1333 /*
1334  * TODO: Support for units > 1?
1335  */
1336 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1337 {
1338         struct semaphore *sem = (struct semaphore *)handle;
1339
1340         if (!sem || (units < 1))
1341                 return AE_BAD_PARAMETER;
1342
1343         if (units > 1)
1344                 return AE_SUPPORT;
1345
1346         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1347                           units));
1348
1349         up(sem);
1350
1351         return AE_OK;
1352 }
1353
1354 #ifdef ACPI_FUTURE_USAGE
1355 u32 acpi_os_get_line(char *buffer)
1356 {
1357
1358 #ifdef ENABLE_DEBUGGER
1359         if (acpi_in_debugger) {
1360                 u32 chars;
1361
1362                 kdb_read(buffer, sizeof(line_buf));
1363
1364                 /* remove the CR kdb includes */
1365                 chars = strlen(buffer) - 1;
1366                 buffer[chars] = '\0';
1367         }
1368 #endif
1369
1370         return 0;
1371 }
1372 #endif                          /*  ACPI_FUTURE_USAGE  */
1373
1374 acpi_status acpi_os_signal(u32 function, void *info)
1375 {
1376         switch (function) {
1377         case ACPI_SIGNAL_FATAL:
1378                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1379                 break;
1380         case ACPI_SIGNAL_BREAKPOINT:
1381                 /*
1382                  * AML Breakpoint
1383                  * ACPI spec. says to treat it as a NOP unless
1384                  * you are debugging.  So if/when we integrate
1385                  * AML debugger into the kernel debugger its
1386                  * hook will go here.  But until then it is
1387                  * not useful to print anything on breakpoints.
1388                  */
1389                 break;
1390         default:
1391                 break;
1392         }
1393
1394         return AE_OK;
1395 }
1396
1397 static int __init acpi_os_name_setup(char *str)
1398 {
1399         char *p = acpi_os_name;
1400         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1401
1402         if (!str || !*str)
1403                 return 0;
1404
1405         for (; count-- && *str; str++) {
1406                 if (isalnum(*str) || *str == ' ' || *str == ':')
1407                         *p++ = *str;
1408                 else if (*str == '\'' || *str == '"')
1409                         continue;
1410                 else
1411                         break;
1412         }
1413         *p = 0;
1414
1415         return 1;
1416
1417 }
1418
1419 __setup("acpi_os_name=", acpi_os_name_setup);
1420
1421 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1422 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1423
1424 struct osi_setup_entry {
1425         char string[OSI_STRING_LENGTH_MAX];
1426         bool enable;
1427 };
1428
1429 static struct osi_setup_entry
1430                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1431         {"Module Device", true},
1432         {"Processor Device", true},
1433         {"3.0 _SCP Extensions", true},
1434         {"Processor Aggregator Device", true},
1435 };
1436
1437 void __init acpi_osi_setup(char *str)
1438 {
1439         struct osi_setup_entry *osi;
1440         bool enable = true;
1441         int i;
1442
1443         if (!acpi_gbl_create_osi_method)
1444                 return;
1445
1446         if (str == NULL || *str == '\0') {
1447                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1448                 acpi_gbl_create_osi_method = FALSE;
1449                 return;
1450         }
1451
1452         if (*str == '!') {
1453                 str++;
1454                 if (*str == '\0') {
1455                         osi_linux.default_disabling = 1;
1456                         return;
1457                 } else if (*str == '*') {
1458                         acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1459                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1460                                 osi = &osi_setup_entries[i];
1461                                 osi->enable = false;
1462                         }
1463                         return;
1464                 }
1465                 enable = false;
1466         }
1467
1468         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1469                 osi = &osi_setup_entries[i];
1470                 if (!strcmp(osi->string, str)) {
1471                         osi->enable = enable;
1472                         break;
1473                 } else if (osi->string[0] == '\0') {
1474                         osi->enable = enable;
1475                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1476                         break;
1477                 }
1478         }
1479 }
1480
1481 static void __init set_osi_linux(unsigned int enable)
1482 {
1483         if (osi_linux.enable != enable)
1484                 osi_linux.enable = enable;
1485
1486         if (osi_linux.enable)
1487                 acpi_osi_setup("Linux");
1488         else
1489                 acpi_osi_setup("!Linux");
1490
1491         return;
1492 }
1493
1494 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1495 {
1496         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1497         osi_linux.dmi = 0;
1498         set_osi_linux(enable);
1499
1500         return;
1501 }
1502
1503 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1504 {
1505         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1506
1507         if (enable == -1)
1508                 return;
1509
1510         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1511         set_osi_linux(enable);
1512
1513         return;
1514 }
1515
1516 /*
1517  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1518  *
1519  * empty string disables _OSI
1520  * string starting with '!' disables that string
1521  * otherwise string is added to list, augmenting built-in strings
1522  */
1523 static void __init acpi_osi_setup_late(void)
1524 {
1525         struct osi_setup_entry *osi;
1526         char *str;
1527         int i;
1528         acpi_status status;
1529
1530         if (osi_linux.default_disabling) {
1531                 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1532
1533                 if (ACPI_SUCCESS(status))
1534                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1535         }
1536
1537         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1538                 osi = &osi_setup_entries[i];
1539                 str = osi->string;
1540
1541                 if (*str == '\0')
1542                         break;
1543                 if (osi->enable) {
1544                         status = acpi_install_interface(str);
1545
1546                         if (ACPI_SUCCESS(status))
1547                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1548                 } else {
1549                         status = acpi_remove_interface(str);
1550
1551                         if (ACPI_SUCCESS(status))
1552                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1553                 }
1554         }
1555 }
1556
1557 static int __init osi_setup(char *str)
1558 {
1559         if (str && !strcmp("Linux", str))
1560                 acpi_cmdline_osi_linux(1);
1561         else if (str && !strcmp("!Linux", str))
1562                 acpi_cmdline_osi_linux(0);
1563         else
1564                 acpi_osi_setup(str);
1565
1566         return 1;
1567 }
1568
1569 __setup("acpi_osi=", osi_setup);
1570
1571 /*
1572  * Disable the auto-serialization of named objects creation methods.
1573  *
1574  * This feature is enabled by default.  It marks the AML control methods
1575  * that contain the opcodes to create named objects as "Serialized".
1576  */
1577 static int __init acpi_no_auto_serialize_setup(char *str)
1578 {
1579         acpi_gbl_auto_serialize_methods = FALSE;
1580         pr_info("ACPI: auto-serialization disabled\n");
1581
1582         return 1;
1583 }
1584
1585 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1586
1587 /* Check of resource interference between native drivers and ACPI
1588  * OperationRegions (SystemIO and System Memory only).
1589  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1590  * in arbitrary AML code and can interfere with legacy drivers.
1591  * acpi_enforce_resources= can be set to:
1592  *
1593  *   - strict (default) (2)
1594  *     -> further driver trying to access the resources will not load
1595  *   - lax              (1)
1596  *     -> further driver trying to access the resources will load, but you
1597  *     get a system message that something might go wrong...
1598  *
1599  *   - no               (0)
1600  *     -> ACPI Operation Region resources will not be registered
1601  *
1602  */
1603 #define ENFORCE_RESOURCES_STRICT 2
1604 #define ENFORCE_RESOURCES_LAX    1
1605 #define ENFORCE_RESOURCES_NO     0
1606
1607 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1608
1609 static int __init acpi_enforce_resources_setup(char *str)
1610 {
1611         if (str == NULL || *str == '\0')
1612                 return 0;
1613
1614         if (!strcmp("strict", str))
1615                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1616         else if (!strcmp("lax", str))
1617                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1618         else if (!strcmp("no", str))
1619                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1620
1621         return 1;
1622 }
1623
1624 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1625
1626 /* Check for resource conflicts between ACPI OperationRegions and native
1627  * drivers */
1628 int acpi_check_resource_conflict(const struct resource *res)
1629 {
1630         acpi_adr_space_type space_id;
1631         acpi_size length;
1632         u8 warn = 0;
1633         int clash = 0;
1634
1635         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1636                 return 0;
1637         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1638                 return 0;
1639
1640         if (res->flags & IORESOURCE_IO)
1641                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1642         else
1643                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1644
1645         length = resource_size(res);
1646         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1647                 warn = 1;
1648         clash = acpi_check_address_range(space_id, res->start, length, warn);
1649
1650         if (clash) {
1651                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1652                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1653                                 printk(KERN_NOTICE "ACPI: This conflict may"
1654                                        " cause random problems and system"
1655                                        " instability\n");
1656                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1657                                " for this device, you should use it instead of"
1658                                " the native driver\n");
1659                 }
1660                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1661                         return -EBUSY;
1662         }
1663         return 0;
1664 }
1665 EXPORT_SYMBOL(acpi_check_resource_conflict);
1666
1667 int acpi_check_region(resource_size_t start, resource_size_t n,
1668                       const char *name)
1669 {
1670         struct resource res = {
1671                 .start = start,
1672                 .end   = start + n - 1,
1673                 .name  = name,
1674                 .flags = IORESOURCE_IO,
1675         };
1676
1677         return acpi_check_resource_conflict(&res);
1678 }
1679 EXPORT_SYMBOL(acpi_check_region);
1680
1681 /*
1682  * Let drivers know whether the resource checks are effective
1683  */
1684 int acpi_resources_are_enforced(void)
1685 {
1686         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1687 }
1688 EXPORT_SYMBOL(acpi_resources_are_enforced);
1689
1690 /*
1691  * Deallocate the memory for a spinlock.
1692  */
1693 void acpi_os_delete_lock(acpi_spinlock handle)
1694 {
1695         ACPI_FREE(handle);
1696 }
1697
1698 /*
1699  * Acquire a spinlock.
1700  *
1701  * handle is a pointer to the spinlock_t.
1702  */
1703
1704 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1705 {
1706         acpi_cpu_flags flags;
1707         spin_lock_irqsave(lockp, flags);
1708         return flags;
1709 }
1710
1711 /*
1712  * Release a spinlock. See above.
1713  */
1714
1715 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1716 {
1717         spin_unlock_irqrestore(lockp, flags);
1718 }
1719
1720 #ifndef ACPI_USE_LOCAL_CACHE
1721
1722 /*******************************************************************************
1723  *
1724  * FUNCTION:    acpi_os_create_cache
1725  *
1726  * PARAMETERS:  name      - Ascii name for the cache
1727  *              size      - Size of each cached object
1728  *              depth     - Maximum depth of the cache (in objects) <ignored>
1729  *              cache     - Where the new cache object is returned
1730  *
1731  * RETURN:      status
1732  *
1733  * DESCRIPTION: Create a cache object
1734  *
1735  ******************************************************************************/
1736
1737 acpi_status
1738 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1739 {
1740         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1741         if (*cache == NULL)
1742                 return AE_ERROR;
1743         else
1744                 return AE_OK;
1745 }
1746
1747 /*******************************************************************************
1748  *
1749  * FUNCTION:    acpi_os_purge_cache
1750  *
1751  * PARAMETERS:  Cache           - Handle to cache object
1752  *
1753  * RETURN:      Status
1754  *
1755  * DESCRIPTION: Free all objects within the requested cache.
1756  *
1757  ******************************************************************************/
1758
1759 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1760 {
1761         kmem_cache_shrink(cache);
1762         return (AE_OK);
1763 }
1764
1765 /*******************************************************************************
1766  *
1767  * FUNCTION:    acpi_os_delete_cache
1768  *
1769  * PARAMETERS:  Cache           - Handle to cache object
1770  *
1771  * RETURN:      Status
1772  *
1773  * DESCRIPTION: Free all objects within the requested cache and delete the
1774  *              cache object.
1775  *
1776  ******************************************************************************/
1777
1778 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1779 {
1780         kmem_cache_destroy(cache);
1781         return (AE_OK);
1782 }
1783
1784 /*******************************************************************************
1785  *
1786  * FUNCTION:    acpi_os_release_object
1787  *
1788  * PARAMETERS:  Cache       - Handle to cache object
1789  *              Object      - The object to be released
1790  *
1791  * RETURN:      None
1792  *
1793  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1794  *              the object is deleted.
1795  *
1796  ******************************************************************************/
1797
1798 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1799 {
1800         kmem_cache_free(cache, object);
1801         return (AE_OK);
1802 }
1803 #endif
1804
1805 static int __init acpi_no_static_ssdt_setup(char *s)
1806 {
1807         acpi_gbl_disable_ssdt_table_install = TRUE;
1808         pr_info("ACPI: static SSDT installation disabled\n");
1809
1810         return 0;
1811 }
1812
1813 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1814
1815 static int __init acpi_disable_return_repair(char *s)
1816 {
1817         printk(KERN_NOTICE PREFIX
1818                "ACPI: Predefined validation mechanism disabled\n");
1819         acpi_gbl_disable_auto_repair = TRUE;
1820
1821         return 1;
1822 }
1823
1824 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1825
1826 acpi_status __init acpi_os_initialize(void)
1827 {
1828         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1829         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1830         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1831         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1832         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1833                 /*
1834                  * Use acpi_os_map_generic_address to pre-map the reset
1835                  * register if it's in system memory.
1836                  */
1837                 int rv;
1838
1839                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1840                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1841         }
1842
1843         return AE_OK;
1844 }
1845
1846 acpi_status __init acpi_os_initialize1(void)
1847 {
1848         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1849         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1850         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1851         BUG_ON(!kacpid_wq);
1852         BUG_ON(!kacpi_notify_wq);
1853         BUG_ON(!kacpi_hotplug_wq);
1854         acpi_install_interface_handler(acpi_osi_handler);
1855         acpi_osi_setup_late();
1856         return AE_OK;
1857 }
1858
1859 acpi_status acpi_os_terminate(void)
1860 {
1861         if (acpi_irq_handler) {
1862                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1863                                                  acpi_irq_handler);
1864         }
1865
1866         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1867         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1868         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1869         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1870         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1871                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1872
1873         destroy_workqueue(kacpid_wq);
1874         destroy_workqueue(kacpi_notify_wq);
1875         destroy_workqueue(kacpi_hotplug_wq);
1876
1877         return AE_OK;
1878 }
1879
1880 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1881                                   u32 pm1b_control)
1882 {
1883         int rc = 0;
1884         if (__acpi_os_prepare_sleep)
1885                 rc = __acpi_os_prepare_sleep(sleep_state,
1886                                              pm1a_control, pm1b_control);
1887         if (rc < 0)
1888                 return AE_ERROR;
1889         else if (rc > 0)
1890                 return AE_CTRL_SKIP;
1891
1892         return AE_OK;
1893 }
1894
1895 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1896                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1897 {
1898         __acpi_os_prepare_sleep = func;
1899 }
1900
1901 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1902                                   u32 val_b)
1903 {
1904         int rc = 0;
1905         if (__acpi_os_prepare_extended_sleep)
1906                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1907                                              val_a, val_b);
1908         if (rc < 0)
1909                 return AE_ERROR;
1910         else if (rc > 0)
1911                 return AE_CTRL_SKIP;
1912
1913         return AE_OK;
1914 }
1915
1916 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1917                                u32 val_a, u32 val_b))
1918 {
1919         __acpi_os_prepare_extended_sleep = func;
1920 }