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