drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <willy@linux.intel.com>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/highmem.h>
  35 #include <linux/pci.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/kmod.h>
  38 #include <linux/delay.h>
  39 #include <linux/workqueue.h>
  40 #include <linux/nmi.h>
  41 #include <linux/acpi.h>
  42 #include <linux/acpi_io.h>
  43 #include <linux/efi.h>
  44 #include <linux/ioport.h>
  45 #include <linux/list.h>
  46 #include <linux/jiffies.h>
  47 #include <linux/semaphore.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/uaccess.h>
  51
  52 #include <acpi/acpi.h>
  53 #include <acpi/acpi_bus.h>
  54 #include <acpi/processor.h>
  55 #include "internal.h"
  56
  57 #define _COMPONENT              ACPI_OS_SERVICES
  58 ACPI_MODULE_NAME("osl");
  59 #define PREFIX          "ACPI: "
  60 struct acpi_os_dpc {
  61         acpi_osd_exec_callback function;
  62         void *context;
  63         struct work_struct work;
  64         int wait;
  65 };
  66
  67 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  68 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  69 #endif
  70
  71 #ifdef ENABLE_DEBUGGER
  72 #include <linux/kdb.h>
  73
  74 /* stuff for debugger support */
  75 int acpi_in_debugger;
  76 EXPORT_SYMBOL(acpi_in_debugger);
  77
  78 extern char line_buf[80];
  79 #endif                          /*ENABLE_DEBUGGER */
  80
  81 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  82                                       u32 pm1b_ctrl);
  83 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  84                                       u32 val_b);
  85
  86 static acpi_osd_handler acpi_irq_handler;
  87 static void *acpi_irq_context;
  88 static struct workqueue_struct *kacpid_wq;
  89 static struct workqueue_struct *kacpi_notify_wq;
  90 static struct workqueue_struct *kacpi_hotplug_wq;
  91
  92 /*
  93  * This list of permanent mappings is for memory that may be accessed from
  94  * interrupt context, where we can't do the ioremap().
  95  */
  96 struct acpi_ioremap {
  97         struct list_head list;
  98         void __iomem *virt;
  99         acpi_physical_address phys;
 100         acpi_size size;
 101         unsigned long refcount;
 102 };
 103
 104 static LIST_HEAD(acpi_ioremaps);
 105 static DEFINE_MUTEX(acpi_ioremap_lock);
 106
 107 static void __init acpi_osi_setup_late(void);
 108
 109 /*
 110  * The story of _OSI(Linux)
 111  *
 112  * From pre-history through Linux-2.6.22,
 113  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 114  *
 115  * Unfortunately, reference BIOS writers got wind of this
 116  * and put OSI(Linux) in their example code, quickly exposing
 117  * this string as ill-conceived and opening the door to
 118  * an un-bounded number of BIOS incompatibilities.
 119  *
 120  * For example, OSI(Linux) was used on resume to re-POST a
 121  * video card on one system, because Linux at that time
 122  * could not do a speedy restore in its native driver.
 123  * But then upon gaining quick native restore capability,
 124  * Linux has no way to tell the BIOS to skip the time-consuming
 125  * POST -- putting Linux at a permanent performance disadvantage.
 126  * On another system, the BIOS writer used OSI(Linux)
 127  * to infer native OS support for IPMI!  On other systems,
 128  * OSI(Linux) simply got in the way of Linux claiming to
 129  * be compatible with other operating systems, exposing
 130  * BIOS issues such as skipped device initialization.
 131  *
 132  * So "Linux" turned out to be a really poor chose of
 133  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 134  *
 135  * BIOS writers should NOT query _OSI(Linux) on future systems.
 136  * Linux will complain on the console when it sees it, and return FALSE.
 137  * To get Linux to return TRUE for your system  will require
 138  * a kernel source update to add a DMI entry,
 139  * or boot with "acpi_osi=Linux"
 140  */
 141
 142 static struct osi_linux {
 143         unsigned int    enable:1;
 144         unsigned int    dmi:1;
 145         unsigned int    cmdline:1;
 146         unsigned int    default_disabling:1;
 147 } osi_linux = {0, 0, 0, 0};
 148
 149 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 150 {
 151         if (!strcmp("Linux", interface)) {
 152
 153                 printk_once(KERN_NOTICE FW_BUG PREFIX
 154                         "BIOS _OSI(Linux) query %s%s\n",
 155                         osi_linux.enable ? "honored" : "ignored",
 156                         osi_linux.cmdline ? " via cmdline" :
 157                         osi_linux.dmi ? " via DMI" : "");
 158         }
 159
 160         return supported;
 161 }
 162
 163 static void __init acpi_request_region (struct acpi_generic_address *gas,
 164         unsigned int length, char *desc)
 165 {
 166         u64 addr;
 167
 168         /* Handle possible alignment issues */
 169         memcpy(&addr, &gas->address, sizeof(addr));
 170         if (!addr || !length)
 171                 return;
 172
 173         /* Resources are never freed */
 174         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 175                 request_region(addr, length, desc);
 176         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 177                 request_mem_region(addr, length, desc);
 178 }
 179
 180 static int __init acpi_reserve_resources(void)
 181 {
 182         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 183                 "ACPI PM1a_EVT_BLK");
 184
 185         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 186                 "ACPI PM1b_EVT_BLK");
 187
 188         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 189                 "ACPI PM1a_CNT_BLK");
 190
 191         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 192                 "ACPI PM1b_CNT_BLK");
 193
 194         if (acpi_gbl_FADT.pm_timer_length == 4)
 195                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 196
 197         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 198                 "ACPI PM2_CNT_BLK");
 199
 200         /* Length of GPE blocks must be a non-negative multiple of 2 */
 201
 202         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 203                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 204                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 205
 206         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 207                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 208                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 209
 210         return 0;
 211 }
 212 device_initcall(acpi_reserve_resources);
 213
 214 void acpi_os_printf(const char *fmt, ...)
 215 {
 216         va_list args;
 217         va_start(args, fmt);
 218         acpi_os_vprintf(fmt, args);
 219         va_end(args);
 220 }
 221
 222 void acpi_os_vprintf(const char *fmt, va_list args)
 223 {
 224         static char buffer[512];
 225
 226         vsprintf(buffer, fmt, args);
 227
 228 #ifdef ENABLE_DEBUGGER
 229         if (acpi_in_debugger) {
 230                 kdb_printf("%s", buffer);
 231         } else {
 232                 printk(KERN_CONT "%s", buffer);
 233         }
 234 #else
 235         printk(KERN_CONT "%s", buffer);
 236 #endif
 237 }
 238
 239 #ifdef CONFIG_KEXEC
 240 static unsigned long acpi_rsdp;
 241 static int __init setup_acpi_rsdp(char *arg)
 242 {
 243         acpi_rsdp = simple_strtoul(arg, NULL, 16);
 244         return 0;
 245 }
 246 early_param("acpi_rsdp", setup_acpi_rsdp);
 247 #endif
 248
 249 acpi_physical_address __init acpi_os_get_root_pointer(void)
 250 {
 251 #ifdef CONFIG_KEXEC
 252         if (acpi_rsdp)
 253                 return acpi_rsdp;
 254 #endif
 255
 256         if (efi_enabled(EFI_CONFIG_TABLES)) {
 257                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 258                         return efi.acpi20;
 259                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 260                         return efi.acpi;
 261                 else {
 262                         printk(KERN_ERR PREFIX
 263                                "System description tables not found\n");
 264                         return 0;
 265                 }
 266         } else {
 267                 acpi_physical_address pa = 0;
 268
 269                 acpi_find_root_pointer(&pa);
 270                 return pa;
 271         }
 272 }
 273
 274 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 275 static struct acpi_ioremap *
 276 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 277 {
 278         struct acpi_ioremap *map;
 279
 280         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 281                 if (map->phys <= phys &&
 282                     phys + size <= map->phys + map->size)
 283                         return map;
 284
 285         return NULL;
 286 }
 287
 288 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 289 static void __iomem *
 290 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 291 {
 292         struct acpi_ioremap *map;
 293
 294         map = acpi_map_lookup(phys, size);
 295         if (map)
 296                 return map->virt + (phys - map->phys);
 297
 298         return NULL;
 299 }
 300
 301 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 302 {
 303         struct acpi_ioremap *map;
 304         void __iomem *virt = NULL;
 305
 306         mutex_lock(&acpi_ioremap_lock);
 307         map = acpi_map_lookup(phys, size);
 308         if (map) {
 309                 virt = map->virt + (phys - map->phys);
 310                 map->refcount++;
 311         }
 312         mutex_unlock(&acpi_ioremap_lock);
 313         return virt;
 314 }
 315 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 316
 317 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 318 static struct acpi_ioremap *
 319 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 320 {
 321         struct acpi_ioremap *map;
 322
 323         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 324                 if (map->virt <= virt &&
 325                     virt + size <= map->virt + map->size)
 326                         return map;
 327
 328         return NULL;
 329 }
 330
 331 #ifndef CONFIG_IA64
 332 #define should_use_kmap(pfn)   page_is_ram(pfn)
 333 #else
 334 /* ioremap will take care of cache attributes */
 335 #define should_use_kmap(pfn)   0
 336 #endif
 337
 338 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 339 {
 340         unsigned long pfn;
 341
 342         pfn = pg_off >> PAGE_SHIFT;
 343         if (should_use_kmap(pfn)) {
 344                 if (pg_sz > PAGE_SIZE)
 345                         return NULL;
 346                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 347         } else
 348                 return acpi_os_ioremap(pg_off, pg_sz);
 349 }
 350
 351 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 352 {
 353         unsigned long pfn;
 354
 355         pfn = pg_off >> PAGE_SHIFT;
 356         if (should_use_kmap(pfn))
 357                 kunmap(pfn_to_page(pfn));
 358         else
 359                 iounmap(vaddr);
 360 }
 361
 362 void __iomem *__init_refok
 363 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 364 {
 365         struct acpi_ioremap *map;
 366         void __iomem *virt;
 367         acpi_physical_address pg_off;
 368         acpi_size pg_sz;
 369
 370         if (phys > ULONG_MAX) {
 371                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 372                 return NULL;
 373         }
 374
 375         if (!acpi_gbl_permanent_mmap)
 376                 return __acpi_map_table((unsigned long)phys, size);
 377
 378         mutex_lock(&acpi_ioremap_lock);
 379         /* Check if there's a suitable mapping already. */
 380         map = acpi_map_lookup(phys, size);
 381         if (map) {
 382                 map->refcount++;
 383                 goto out;
 384         }
 385
 386         map = kzalloc(sizeof(*map), GFP_KERNEL);
 387         if (!map) {
 388                 mutex_unlock(&acpi_ioremap_lock);
 389                 return NULL;
 390         }
 391
 392         pg_off = round_down(phys, PAGE_SIZE);
 393         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 394         virt = acpi_map(pg_off, pg_sz);
 395         if (!virt) {
 396                 mutex_unlock(&acpi_ioremap_lock);
 397                 kfree(map);
 398                 return NULL;
 399         }
 400
 401         INIT_LIST_HEAD(&map->list);
 402         map->virt = virt;
 403         map->phys = pg_off;
 404         map->size = pg_sz;
 405         map->refcount = 1;
 406
 407         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 408
 409  out:
 410         mutex_unlock(&acpi_ioremap_lock);
 411         return map->virt + (phys - map->phys);
 412 }
 413 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 414
 415 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 416 {
 417         if (!--map->refcount)
 418                 list_del_rcu(&map->list);
 419 }
 420
 421 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 422 {
 423         if (!map->refcount) {
 424                 synchronize_rcu();
 425                 acpi_unmap(map->phys, map->virt);
 426                 kfree(map);
 427         }
 428 }
 429
 430 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 431 {
 432         struct acpi_ioremap *map;
 433
 434         if (!acpi_gbl_permanent_mmap) {
 435                 __acpi_unmap_table(virt, size);
 436                 return;
 437         }
 438
 439         mutex_lock(&acpi_ioremap_lock);
 440         map = acpi_map_lookup_virt(virt, size);
 441         if (!map) {
 442                 mutex_unlock(&acpi_ioremap_lock);
 443                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 444                 return;
 445         }
 446         acpi_os_drop_map_ref(map);
 447         mutex_unlock(&acpi_ioremap_lock);
 448
 449         acpi_os_map_cleanup(map);
 450 }
 451 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 452
 453 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 454 {
 455         if (!acpi_gbl_permanent_mmap)
 456                 __acpi_unmap_table(virt, size);
 457 }
 458
 459 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 460 {
 461         u64 addr;
 462         void __iomem *virt;
 463
 464         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 465                 return 0;
 466
 467         /* Handle possible alignment issues */
 468         memcpy(&addr, &gas->address, sizeof(addr));
 469         if (!addr || !gas->bit_width)
 470                 return -EINVAL;
 471
 472         virt = acpi_os_map_memory(addr, gas->bit_width / 8);
 473         if (!virt)
 474                 return -EIO;
 475
 476         return 0;
 477 }
 478 EXPORT_SYMBOL(acpi_os_map_generic_address);
 479
 480 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 481 {
 482         u64 addr;
 483         struct acpi_ioremap *map;
 484
 485         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 486                 return;
 487
 488         /* Handle possible alignment issues */
 489         memcpy(&addr, &gas->address, sizeof(addr));
 490         if (!addr || !gas->bit_width)
 491                 return;
 492
 493         mutex_lock(&acpi_ioremap_lock);
 494         map = acpi_map_lookup(addr, gas->bit_width / 8);
 495         if (!map) {
 496                 mutex_unlock(&acpi_ioremap_lock);
 497                 return;
 498         }
 499         acpi_os_drop_map_ref(map);
 500         mutex_unlock(&acpi_ioremap_lock);
 501
 502         acpi_os_map_cleanup(map);
 503 }
 504 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 505
 506 #ifdef ACPI_FUTURE_USAGE
 507 acpi_status
 508 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 509 {
 510         if (!phys || !virt)
 511                 return AE_BAD_PARAMETER;
 512
 513         *phys = virt_to_phys(virt);
 514
 515         return AE_OK;
 516 }
 517 #endif
 518
 519 #define ACPI_MAX_OVERRIDE_LEN 100
 520
 521 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 522
 523 acpi_status
 524 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 525                             acpi_string * new_val)
 526 {
 527         if (!init_val || !new_val)
 528                 return AE_BAD_PARAMETER;
 529
 530         *new_val = NULL;
 531         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 532                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 533                        acpi_os_name);
 534                 *new_val = acpi_os_name;
 535         }
 536
 537         return AE_OK;
 538 }
 539
 540 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 541 #include <linux/earlycpio.h>
 542 #include <linux/memblock.h>
 543
 544 static u64 acpi_tables_addr;
 545 static int all_tables_size;
 546
 547 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 548 u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 549 {
 550         u8 sum = 0;
 551         u8 *end = buffer + length;
 552
 553         while (buffer < end)
 554                 sum = (u8) (sum + *(buffer++));
 555         return sum;
 556 }
 557
 558 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 559 static const char * const table_sigs[] = {
 560         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 561         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 562         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 563         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 564         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 565         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 566         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 567         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 568         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 569
 570 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 571
 572 #define ACPI_OVERRIDE_TABLES 64
 573 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
 574
 575 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 576
 577 void __init acpi_initrd_override(void *data, size_t size)
 578 {
 579         int sig, no, table_nr = 0, total_offset = 0;
 580         long offset = 0;
 581         struct acpi_table_header *table;
 582         char cpio_path[32] = "kernel/firmware/acpi/";
 583         struct cpio_data file;
 584
 585         if (data == NULL || size == 0)
 586                 return;
 587
 588         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 589                 file = find_cpio_data(cpio_path, data, size, &offset);
 590                 if (!file.data)
 591                         break;
 592
 593                 data += offset;
 594                 size -= offset;
 595
 596                 if (file.size < sizeof(struct acpi_table_header)) {
 597                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 598                                 cpio_path, file.name);
 599                         continue;
 600                 }
 601
 602                 table = file.data;
 603
 604                 for (sig = 0; table_sigs[sig]; sig++)
 605                         if (!memcmp(table->signature, table_sigs[sig], 4))
 606                                 break;
 607
 608                 if (!table_sigs[sig]) {
 609                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 610                                 cpio_path, file.name);
 611                         continue;
 612                 }
 613                 if (file.size != table->length) {
 614                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 615                                 cpio_path, file.name);
 616                         continue;
 617                 }
 618                 if (acpi_table_checksum(file.data, table->length)) {
 619                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 620                                 cpio_path, file.name);
 621                         continue;
 622                 }
 623
 624                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 625                         table->signature, cpio_path, file.name, table->length);
 626
 627                 all_tables_size += table->length;
 628                 acpi_initrd_files[table_nr].data = file.data;
 629                 acpi_initrd_files[table_nr].size = file.size;
 630                 table_nr++;
 631         }
 632         if (table_nr == 0)
 633                 return;
 634
 635         acpi_tables_addr =
 636                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 637                                        all_tables_size, PAGE_SIZE);
 638         if (!acpi_tables_addr) {
 639                 WARN_ON(1);
 640                 return;
 641         }
 642         /*
 643          * Only calling e820_add_reserve does not work and the
 644          * tables are invalid (memory got used) later.
 645          * memblock_reserve works as expected and the tables won't get modified.
 646          * But it's not enough on X86 because ioremap will
 647          * complain later (used by acpi_os_map_memory) that the pages
 648          * that should get mapped are not marked "reserved".
 649          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 650          * works fine.
 651          */
 652         memblock_reserve(acpi_tables_addr, all_tables_size);
 653         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 654
 655         /*
 656          * early_ioremap only can remap 256k one time. If we map all
 657          * tables one time, we will hit the limit. Need to map chunks
 658          * one by one during copying the same as that in relocate_initrd().
 659          */
 660         for (no = 0; no < table_nr; no++) {
 661                 unsigned char *src_p = acpi_initrd_files[no].data;
 662                 phys_addr_t size = acpi_initrd_files[no].size;
 663                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 664                 phys_addr_t slop, clen;
 665                 char *dest_p;
 666
 667                 total_offset += size;
 668
 669                 while (size) {
 670                         slop = dest_addr & ~PAGE_MASK;
 671                         clen = size;
 672                         if (clen > MAP_CHUNK_SIZE - slop)
 673                                 clen = MAP_CHUNK_SIZE - slop;
 674                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
 675                                                  clen + slop);
 676                         memcpy(dest_p + slop, src_p, clen);
 677                         early_iounmap(dest_p, clen + slop);
 678                         src_p += clen;
 679                         dest_addr += clen;
 680                         size -= clen;
 681                 }
 682         }
 683 }
 684 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 685
 686 static void acpi_table_taint(struct acpi_table_header *table)
 687 {
 688         pr_warn(PREFIX
 689                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 690                 table->signature, table->oem_table_id);
 691         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 692 }
 693
 694
 695 acpi_status
 696 acpi_os_table_override(struct acpi_table_header * existing_table,
 697                        struct acpi_table_header ** new_table)
 698 {
 699         if (!existing_table || !new_table)
 700                 return AE_BAD_PARAMETER;
 701
 702         *new_table = NULL;
 703
 704 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 705         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 706                 *new_table = (struct acpi_table_header *)AmlCode;
 707 #endif
 708         if (*new_table != NULL)
 709                 acpi_table_taint(existing_table);
 710         return AE_OK;
 711 }
 712
 713 acpi_status
 714 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 715                                 acpi_physical_address *address,
 716                                 u32 *table_length)
 717 {
 718 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 719         *table_length = 0;
 720         *address = 0;
 721         return AE_OK;
 722 #else
 723         int table_offset = 0;
 724         struct acpi_table_header *table;
 725
 726         *table_length = 0;
 727         *address = 0;
 728
 729         if (!acpi_tables_addr)
 730                 return AE_OK;
 731
 732         do {
 733                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 734                         WARN_ON(1);
 735                         return AE_OK;
 736                 }
 737
 738                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 739                                            ACPI_HEADER_SIZE);
 740
 741                 if (table_offset + table->length > all_tables_size) {
 742                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 743                         WARN_ON(1);
 744                         return AE_OK;
 745                 }
 746
 747                 table_offset += table->length;
 748
 749                 if (memcmp(existing_table->signature, table->signature, 4)) {
 750                         acpi_os_unmap_memory(table,
 751                                      ACPI_HEADER_SIZE);
 752                         continue;
 753                 }
 754
 755                 /* Only override tables with matching oem id */
 756                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 757                            ACPI_OEM_TABLE_ID_SIZE)) {
 758                         acpi_os_unmap_memory(table,
 759                                      ACPI_HEADER_SIZE);
 760                         continue;
 761                 }
 762
 763                 table_offset -= table->length;
 764                 *table_length = table->length;
 765                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 766                 *address = acpi_tables_addr + table_offset;
 767                 break;
 768         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 769
 770         if (*address != 0)
 771                 acpi_table_taint(existing_table);
 772         return AE_OK;
 773 #endif
 774 }
 775
 776 static irqreturn_t acpi_irq(int irq, void *dev_id)
 777 {
 778         u32 handled;
 779
 780         handled = (*acpi_irq_handler) (acpi_irq_context);
 781
 782         if (handled) {
 783                 acpi_irq_handled++;
 784                 return IRQ_HANDLED;
 785         } else {
 786                 acpi_irq_not_handled++;
 787                 return IRQ_NONE;
 788         }
 789 }
 790
 791 acpi_status
 792 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 793                                   void *context)
 794 {
 795         unsigned int irq;
 796
 797         acpi_irq_stats_init();
 798
 799         /*
 800          * ACPI interrupts different from the SCI in our copy of the FADT are
 801          * not supported.
 802          */
 803         if (gsi != acpi_gbl_FADT.sci_interrupt)
 804                 return AE_BAD_PARAMETER;
 805
 806         if (acpi_irq_handler)
 807                 return AE_ALREADY_ACQUIRED;
 808
 809         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 810                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 811                        gsi);
 812                 return AE_OK;
 813         }
 814
 815         acpi_irq_handler = handler;
 816         acpi_irq_context = context;
 817         if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
 818                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 819                 acpi_irq_handler = NULL;
 820                 return AE_NOT_ACQUIRED;
 821         }
 822
 823         return AE_OK;
 824 }
 825
 826 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 827 {
 828         if (irq != acpi_gbl_FADT.sci_interrupt)
 829                 return AE_BAD_PARAMETER;
 830
 831         free_irq(irq, acpi_irq);
 832         acpi_irq_handler = NULL;
 833
 834         return AE_OK;
 835 }
 836
 837 /*
 838  * Running in interpreter thread context, safe to sleep
 839  */
 840
 841 void acpi_os_sleep(u64 ms)
 842 {
 843         msleep(ms);
 844 }
 845
 846 void acpi_os_stall(u32 us)
 847 {
 848         while (us) {
 849                 u32 delay = 1000;
 850
 851                 if (delay > us)
 852                         delay = us;
 853                 udelay(delay);
 854                 touch_nmi_watchdog();
 855                 us -= delay;
 856         }
 857 }
 858
 859 /*
 860  * Support ACPI 3.0 AML Timer operand
 861  * Returns 64-bit free-running, monotonically increasing timer
 862  * with 100ns granularity
 863  */
 864 u64 acpi_os_get_timer(void)
 865 {
 866         u64 time_ns = ktime_to_ns(ktime_get());
 867         do_div(time_ns, 100);
 868         return time_ns;
 869 }
 870
 871 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 872 {
 873         u32 dummy;
 874
 875         if (!value)
 876                 value = &dummy;
 877
 878         *value = 0;
 879         if (width <= 8) {
 880                 *(u8 *) value = inb(port);
 881         } else if (width <= 16) {
 882                 *(u16 *) value = inw(port);
 883         } else if (width <= 32) {
 884                 *(u32 *) value = inl(port);
 885         } else {
 886                 BUG();
 887         }
 888
 889         return AE_OK;
 890 }
 891
 892 EXPORT_SYMBOL(acpi_os_read_port);
 893
 894 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 895 {
 896         if (width <= 8) {
 897                 outb(value, port);
 898         } else if (width <= 16) {
 899                 outw(value, port);
 900         } else if (width <= 32) {
 901                 outl(value, port);
 902         } else {
 903                 BUG();
 904         }
 905
 906         return AE_OK;
 907 }
 908
 909 EXPORT_SYMBOL(acpi_os_write_port);
 910
 911 #ifdef readq
 912 static inline u64 read64(const volatile void __iomem *addr)
 913 {
 914         return readq(addr);
 915 }
 916 #else
 917 static inline u64 read64(const volatile void __iomem *addr)
 918 {
 919         u64 l, h;
 920         l = readl(addr);
 921         h = readl(addr+4);
 922         return l | (h << 32);
 923 }
 924 #endif
 925
 926 acpi_status
 927 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 928 {
 929         void __iomem *virt_addr;
 930         unsigned int size = width / 8;
 931         bool unmap = false;
 932         u64 dummy;
 933
 934         rcu_read_lock();
 935         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 936         if (!virt_addr) {
 937                 rcu_read_unlock();
 938                 virt_addr = acpi_os_ioremap(phys_addr, size);
 939                 if (!virt_addr)
 940                         return AE_BAD_ADDRESS;
 941                 unmap = true;
 942         }
 943
 944         if (!value)
 945                 value = &dummy;
 946
 947         switch (width) {
 948         case 8:
 949                 *(u8 *) value = readb(virt_addr);
 950                 break;
 951         case 16:
 952                 *(u16 *) value = readw(virt_addr);
 953                 break;
 954         case 32:
 955                 *(u32 *) value = readl(virt_addr);
 956                 break;
 957         case 64:
 958                 *(u64 *) value = read64(virt_addr);
 959                 break;
 960         default:
 961                 BUG();
 962         }
 963
 964         if (unmap)
 965                 iounmap(virt_addr);
 966         else
 967                 rcu_read_unlock();
 968
 969         return AE_OK;
 970 }
 971
 972 #ifdef writeq
 973 static inline void write64(u64 val, volatile void __iomem *addr)
 974 {
 975         writeq(val, addr);
 976 }
 977 #else
 978 static inline void write64(u64 val, volatile void __iomem *addr)
 979 {
 980         writel(val, addr);
 981         writel(val>>32, addr+4);
 982 }
 983 #endif
 984
 985 acpi_status
 986 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 987 {
 988         void __iomem *virt_addr;
 989         unsigned int size = width / 8;
 990         bool unmap = false;
 991
 992         rcu_read_lock();
 993         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 994         if (!virt_addr) {
 995                 rcu_read_unlock();
 996                 virt_addr = acpi_os_ioremap(phys_addr, size);
 997                 if (!virt_addr)
 998                         return AE_BAD_ADDRESS;
 999                 unmap = true;
1000         }
1001
1002         switch (width) {
1003         case 8:
1004                 writeb(value, virt_addr);
1005                 break;
1006         case 16:
1007                 writew(value, virt_addr);
1008                 break;
1009         case 32:
1010                 writel(value, virt_addr);
1011                 break;
1012         case 64:
1013                 write64(value, virt_addr);
1014                 break;
1015         default:
1016                 BUG();
1017         }
1018
1019         if (unmap)
1020                 iounmap(virt_addr);
1021         else
1022                 rcu_read_unlock();
1023
1024         return AE_OK;
1025 }
1026
1027 acpi_status
1028 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1029                                u64 *value, u32 width)
1030 {
1031         int result, size;
1032         u32 value32;
1033
1034         if (!value)
1035                 return AE_BAD_PARAMETER;
1036
1037         switch (width) {
1038         case 8:
1039                 size = 1;
1040                 break;
1041         case 16:
1042                 size = 2;
1043                 break;
1044         case 32:
1045                 size = 4;
1046                 break;
1047         default:
1048                 return AE_ERROR;
1049         }
1050
1051         result = raw_pci_read(pci_id->segment, pci_id->bus,
1052                                 PCI_DEVFN(pci_id->device, pci_id->function),
1053                                 reg, size, &value32);
1054         *value = value32;
1055
1056         return (result ? AE_ERROR : AE_OK);
1057 }
1058
1059 acpi_status
1060 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1061                                 u64 value, u32 width)
1062 {
1063         int result, size;
1064
1065         switch (width) {
1066         case 8:
1067                 size = 1;
1068                 break;
1069         case 16:
1070                 size = 2;
1071                 break;
1072         case 32:
1073                 size = 4;
1074                 break;
1075         default:
1076                 return AE_ERROR;
1077         }
1078
1079         result = raw_pci_write(pci_id->segment, pci_id->bus,
1080                                 PCI_DEVFN(pci_id->device, pci_id->function),
1081                                 reg, size, value);
1082
1083         return (result ? AE_ERROR : AE_OK);
1084 }
1085
1086 static void acpi_os_execute_deferred(struct work_struct *work)
1087 {
1088         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1089
1090         if (dpc->wait)
1091                 acpi_os_wait_events_complete();
1092
1093         dpc->function(dpc->context);
1094         kfree(dpc);
1095 }
1096
1097 /*******************************************************************************
1098  *
1099  * FUNCTION:    acpi_os_execute
1100  *
1101  * PARAMETERS:  Type               - Type of the callback
1102  *              Function           - Function to be executed
1103  *              Context            - Function parameters
1104  *
1105  * RETURN:      Status
1106  *
1107  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1108  *              immediately executes function on a separate thread.
1109  *
1110  ******************************************************************************/
1111
1112 static acpi_status __acpi_os_execute(acpi_execute_type type,
1113         acpi_osd_exec_callback function, void *context, int hp)
1114 {
1115         acpi_status status = AE_OK;
1116         struct acpi_os_dpc *dpc;
1117         struct workqueue_struct *queue;
1118         int ret;
1119         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1120                           "Scheduling function [%p(%p)] for deferred execution.\n",
1121                           function, context));
1122
1123         /*
1124          * Allocate/initialize DPC structure.  Note that this memory will be
1125          * freed by the callee.  The kernel handles the work_struct list  in a
1126          * way that allows us to also free its memory inside the callee.
1127          * Because we may want to schedule several tasks with different
1128          * parameters we can't use the approach some kernel code uses of
1129          * having a static work_struct.
1130          */
1131
1132         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1133         if (!dpc)
1134                 return AE_NO_MEMORY;
1135
1136         dpc->function = function;
1137         dpc->context = context;
1138
1139         /*
1140          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1141          * because the hotplug code may call driver .remove() functions,
1142          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1143          * to flush these workqueues.
1144          *
1145          * To prevent lockdep from complaining unnecessarily, make sure that
1146          * there is a different static lockdep key for each workqueue by using
1147          * INIT_WORK() for each of them separately.
1148          */
1149         if (hp) {
1150                 queue = kacpi_hotplug_wq;
1151                 dpc->wait = 1;
1152                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1153         } else if (type == OSL_NOTIFY_HANDLER) {
1154                 queue = kacpi_notify_wq;
1155                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1156         } else {
1157                 queue = kacpid_wq;
1158                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1159         }
1160
1161         /*
1162          * On some machines, a software-initiated SMI causes corruption unless
1163          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1164          * typically it's done in GPE-related methods that are run via
1165          * workqueues, so we can avoid the known corruption cases by always
1166          * queueing on CPU 0.
1167          */
1168         ret = queue_work_on(0, queue, &dpc->work);
1169
1170         if (!ret) {
1171                 printk(KERN_ERR PREFIX
1172                           "Call to queue_work() failed.\n");
1173                 status = AE_ERROR;
1174                 kfree(dpc);
1175         }
1176         return status;
1177 }
1178
1179 acpi_status acpi_os_execute(acpi_execute_type type,
1180                             acpi_osd_exec_callback function, void *context)
1181 {
1182         return __acpi_os_execute(type, function, context, 0);
1183 }
1184 EXPORT_SYMBOL(acpi_os_execute);
1185
1186 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1187         void *context)
1188 {
1189         return __acpi_os_execute(0, function, context, 1);
1190 }
1191 EXPORT_SYMBOL(acpi_os_hotplug_execute);
1192
1193 void acpi_os_wait_events_complete(void)
1194 {
1195         flush_workqueue(kacpid_wq);
1196         flush_workqueue(kacpi_notify_wq);
1197 }
1198
1199 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1200
1201 acpi_status
1202 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1203 {
1204         struct semaphore *sem = NULL;
1205
1206         sem = acpi_os_allocate(sizeof(struct semaphore));
1207         if (!sem)
1208                 return AE_NO_MEMORY;
1209         memset(sem, 0, sizeof(struct semaphore));
1210
1211         sema_init(sem, initial_units);
1212
1213         *handle = (acpi_handle *) sem;
1214
1215         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1216                           *handle, initial_units));
1217
1218         return AE_OK;
1219 }
1220
1221 /*
1222  * TODO: A better way to delete semaphores?  Linux doesn't have a
1223  * 'delete_semaphore()' function -- may result in an invalid
1224  * pointer dereference for non-synchronized consumers.  Should
1225  * we at least check for blocked threads and signal/cancel them?
1226  */
1227
1228 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1229 {
1230         struct semaphore *sem = (struct semaphore *)handle;
1231
1232         if (!sem)
1233                 return AE_BAD_PARAMETER;
1234
1235         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1236
1237         BUG_ON(!list_empty(&sem->wait_list));
1238         kfree(sem);
1239         sem = NULL;
1240
1241         return AE_OK;
1242 }
1243
1244 /*
1245  * TODO: Support for units > 1?
1246  */
1247 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1248 {
1249         acpi_status status = AE_OK;
1250         struct semaphore *sem = (struct semaphore *)handle;
1251         long jiffies;
1252         int ret = 0;
1253
1254         if (!sem || (units < 1))
1255                 return AE_BAD_PARAMETER;
1256
1257         if (units > 1)
1258                 return AE_SUPPORT;
1259
1260         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1261                           handle, units, timeout));
1262
1263         if (timeout == ACPI_WAIT_FOREVER)
1264                 jiffies = MAX_SCHEDULE_TIMEOUT;
1265         else
1266                 jiffies = msecs_to_jiffies(timeout);
1267
1268         ret = down_timeout(sem, jiffies);
1269         if (ret)
1270                 status = AE_TIME;
1271
1272         if (ACPI_FAILURE(status)) {
1273                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1274                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1275                                   handle, units, timeout,
1276                                   acpi_format_exception(status)));
1277         } else {
1278                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1279                                   "Acquired semaphore[%p|%d|%d]", handle,
1280                                   units, timeout));
1281         }
1282
1283         return status;
1284 }
1285
1286 /*
1287  * TODO: Support for units > 1?
1288  */
1289 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1290 {
1291         struct semaphore *sem = (struct semaphore *)handle;
1292
1293         if (!sem || (units < 1))
1294                 return AE_BAD_PARAMETER;
1295
1296         if (units > 1)
1297                 return AE_SUPPORT;
1298
1299         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1300                           units));
1301
1302         up(sem);
1303
1304         return AE_OK;
1305 }
1306
1307 #ifdef ACPI_FUTURE_USAGE
1308 u32 acpi_os_get_line(char *buffer)
1309 {
1310
1311 #ifdef ENABLE_DEBUGGER
1312         if (acpi_in_debugger) {
1313                 u32 chars;
1314
1315                 kdb_read(buffer, sizeof(line_buf));
1316
1317                 /* remove the CR kdb includes */
1318                 chars = strlen(buffer) - 1;
1319                 buffer[chars] = '\0';
1320         }
1321 #endif
1322
1323         return 0;
1324 }
1325 #endif                          /*  ACPI_FUTURE_USAGE  */
1326
1327 acpi_status acpi_os_signal(u32 function, void *info)
1328 {
1329         switch (function) {
1330         case ACPI_SIGNAL_FATAL:
1331                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1332                 break;
1333         case ACPI_SIGNAL_BREAKPOINT:
1334                 /*
1335                  * AML Breakpoint
1336                  * ACPI spec. says to treat it as a NOP unless
1337                  * you are debugging.  So if/when we integrate
1338                  * AML debugger into the kernel debugger its
1339                  * hook will go here.  But until then it is
1340                  * not useful to print anything on breakpoints.
1341                  */
1342                 break;
1343         default:
1344                 break;
1345         }
1346
1347         return AE_OK;
1348 }
1349
1350 static int __init acpi_os_name_setup(char *str)
1351 {
1352         char *p = acpi_os_name;
1353         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1354
1355         if (!str || !*str)
1356                 return 0;
1357
1358         for (; count-- && *str; str++) {
1359                 if (isalnum(*str) || *str == ' ' || *str == ':')
1360                         *p++ = *str;
1361                 else if (*str == '\'' || *str == '"')
1362                         continue;
1363                 else
1364                         break;
1365         }
1366         *p = 0;
1367
1368         return 1;
1369
1370 }
1371
1372 __setup("acpi_os_name=", acpi_os_name_setup);
1373
1374 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1375 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1376
1377 struct osi_setup_entry {
1378         char string[OSI_STRING_LENGTH_MAX];
1379         bool enable;
1380 };
1381
1382 static struct osi_setup_entry
1383                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1384         {"Module Device", true},
1385         {"Processor Device", true},
1386         {"3.0 _SCP Extensions", true},
1387         {"Processor Aggregator Device", true},
1388 };
1389
1390 void __init acpi_osi_setup(char *str)
1391 {
1392         struct osi_setup_entry *osi;
1393         bool enable = true;
1394         int i;
1395
1396         if (!acpi_gbl_create_osi_method)
1397                 return;
1398
1399         if (str == NULL || *str == '\0') {
1400                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1401                 acpi_gbl_create_osi_method = FALSE;
1402                 return;
1403         }
1404
1405         if (*str == '!') {
1406                 str++;
1407                 if (*str == '\0') {
1408                         osi_linux.default_disabling = 1;
1409                         return;
1410                 } else if (*str == '*') {
1411                         acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1412                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1413                                 osi = &osi_setup_entries[i];
1414                                 osi->enable = false;
1415                         }
1416                         return;
1417                 }
1418                 enable = false;
1419         }
1420
1421         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1422                 osi = &osi_setup_entries[i];
1423                 if (!strcmp(osi->string, str)) {
1424                         osi->enable = enable;
1425                         break;
1426                 } else if (osi->string[0] == '\0') {
1427                         osi->enable = enable;
1428                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1429                         break;
1430                 }
1431         }
1432 }
1433
1434 static void __init set_osi_linux(unsigned int enable)
1435 {
1436         if (osi_linux.enable != enable)
1437                 osi_linux.enable = enable;
1438
1439         if (osi_linux.enable)
1440                 acpi_osi_setup("Linux");
1441         else
1442                 acpi_osi_setup("!Linux");
1443
1444         return;
1445 }
1446
1447 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1448 {
1449         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1450         osi_linux.dmi = 0;
1451         set_osi_linux(enable);
1452
1453         return;
1454 }
1455
1456 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1457 {
1458         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1459
1460         if (enable == -1)
1461                 return;
1462
1463         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1464         set_osi_linux(enable);
1465
1466         return;
1467 }
1468
1469 /*
1470  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1471  *
1472  * empty string disables _OSI
1473  * string starting with '!' disables that string
1474  * otherwise string is added to list, augmenting built-in strings
1475  */
1476 static void __init acpi_osi_setup_late(void)
1477 {
1478         struct osi_setup_entry *osi;
1479         char *str;
1480         int i;
1481         acpi_status status;
1482
1483         if (osi_linux.default_disabling) {
1484                 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1485
1486                 if (ACPI_SUCCESS(status))
1487                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1488         }
1489
1490         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1491                 osi = &osi_setup_entries[i];
1492                 str = osi->string;
1493
1494                 if (*str == '\0')
1495                         break;
1496                 if (osi->enable) {
1497                         status = acpi_install_interface(str);
1498
1499                         if (ACPI_SUCCESS(status))
1500                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1501                 } else {
1502                         status = acpi_remove_interface(str);
1503
1504                         if (ACPI_SUCCESS(status))
1505                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1506                 }
1507         }
1508 }
1509
1510 static int __init osi_setup(char *str)
1511 {
1512         if (str && !strcmp("Linux", str))
1513                 acpi_cmdline_osi_linux(1);
1514         else if (str && !strcmp("!Linux", str))
1515                 acpi_cmdline_osi_linux(0);
1516         else
1517                 acpi_osi_setup(str);
1518
1519         return 1;
1520 }
1521
1522 __setup("acpi_osi=", osi_setup);
1523
1524 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1525 static int __init acpi_serialize_setup(char *str)
1526 {
1527         printk(KERN_INFO PREFIX "serialize enabled\n");
1528
1529         acpi_gbl_all_methods_serialized = TRUE;
1530
1531         return 1;
1532 }
1533
1534 __setup("acpi_serialize", acpi_serialize_setup);
1535
1536 /* Check of resource interference between native drivers and ACPI
1537  * OperationRegions (SystemIO and System Memory only).
1538  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1539  * in arbitrary AML code and can interfere with legacy drivers.
1540  * acpi_enforce_resources= can be set to:
1541  *
1542  *   - strict (default) (2)
1543  *     -> further driver trying to access the resources will not load
1544  *   - lax              (1)
1545  *     -> further driver trying to access the resources will load, but you
1546  *     get a system message that something might go wrong...
1547  *
1548  *   - no               (0)
1549  *     -> ACPI Operation Region resources will not be registered
1550  *
1551  */
1552 #define ENFORCE_RESOURCES_STRICT 2
1553 #define ENFORCE_RESOURCES_LAX    1
1554 #define ENFORCE_RESOURCES_NO     0
1555
1556 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1557
1558 static int __init acpi_enforce_resources_setup(char *str)
1559 {
1560         if (str == NULL || *str == '\0')
1561                 return 0;
1562
1563         if (!strcmp("strict", str))
1564                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1565         else if (!strcmp("lax", str))
1566                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1567         else if (!strcmp("no", str))
1568                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1569
1570         return 1;
1571 }
1572
1573 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1574
1575 /* Check for resource conflicts between ACPI OperationRegions and native
1576  * drivers */
1577 int acpi_check_resource_conflict(const struct resource *res)
1578 {
1579         acpi_adr_space_type space_id;
1580         acpi_size length;
1581         u8 warn = 0;
1582         int clash = 0;
1583
1584         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1585                 return 0;
1586         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1587                 return 0;
1588
1589         if (res->flags & IORESOURCE_IO)
1590                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1591         else
1592                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1593
1594         length = resource_size(res);
1595         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1596                 warn = 1;
1597         clash = acpi_check_address_range(space_id, res->start, length, warn);
1598
1599         if (clash) {
1600                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1601                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1602                                 printk(KERN_NOTICE "ACPI: This conflict may"
1603                                        " cause random problems and system"
1604                                        " instability\n");
1605                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1606                                " for this device, you should use it instead of"
1607                                " the native driver\n");
1608                 }
1609                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1610                         return -EBUSY;
1611         }
1612         return 0;
1613 }
1614 EXPORT_SYMBOL(acpi_check_resource_conflict);
1615
1616 int acpi_check_region(resource_size_t start, resource_size_t n,
1617                       const char *name)
1618 {
1619         struct resource res = {
1620                 .start = start,
1621                 .end   = start + n - 1,
1622                 .name  = name,
1623                 .flags = IORESOURCE_IO,
1624         };
1625
1626         return acpi_check_resource_conflict(&res);
1627 }
1628 EXPORT_SYMBOL(acpi_check_region);
1629
1630 /*
1631  * Let drivers know whether the resource checks are effective
1632  */
1633 int acpi_resources_are_enforced(void)
1634 {
1635         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1636 }
1637 EXPORT_SYMBOL(acpi_resources_are_enforced);
1638
1639 /*
1640  * Deallocate the memory for a spinlock.
1641  */
1642 void acpi_os_delete_lock(acpi_spinlock handle)
1643 {
1644         ACPI_FREE(handle);
1645 }
1646
1647 /*
1648  * Acquire a spinlock.
1649  *
1650  * handle is a pointer to the spinlock_t.
1651  */
1652
1653 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1654 {
1655         acpi_cpu_flags flags;
1656         spin_lock_irqsave(lockp, flags);
1657         return flags;
1658 }
1659
1660 /*
1661  * Release a spinlock. See above.
1662  */
1663
1664 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1665 {
1666         spin_unlock_irqrestore(lockp, flags);
1667 }
1668
1669 #ifndef ACPI_USE_LOCAL_CACHE
1670
1671 /*******************************************************************************
1672  *
1673  * FUNCTION:    acpi_os_create_cache
1674  *
1675  * PARAMETERS:  name      - Ascii name for the cache
1676  *              size      - Size of each cached object
1677  *              depth     - Maximum depth of the cache (in objects) <ignored>
1678  *              cache     - Where the new cache object is returned
1679  *
1680  * RETURN:      status
1681  *
1682  * DESCRIPTION: Create a cache object
1683  *
1684  ******************************************************************************/
1685
1686 acpi_status
1687 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1688 {
1689         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1690         if (*cache == NULL)
1691                 return AE_ERROR;
1692         else
1693                 return AE_OK;
1694 }
1695
1696 /*******************************************************************************
1697  *
1698  * FUNCTION:    acpi_os_purge_cache
1699  *
1700  * PARAMETERS:  Cache           - Handle to cache object
1701  *
1702  * RETURN:      Status
1703  *
1704  * DESCRIPTION: Free all objects within the requested cache.
1705  *
1706  ******************************************************************************/
1707
1708 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1709 {
1710         kmem_cache_shrink(cache);
1711         return (AE_OK);
1712 }
1713
1714 /*******************************************************************************
1715  *
1716  * FUNCTION:    acpi_os_delete_cache
1717  *
1718  * PARAMETERS:  Cache           - Handle to cache object
1719  *
1720  * RETURN:      Status
1721  *
1722  * DESCRIPTION: Free all objects within the requested cache and delete the
1723  *              cache object.
1724  *
1725  ******************************************************************************/
1726
1727 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1728 {
1729         kmem_cache_destroy(cache);
1730         return (AE_OK);
1731 }
1732
1733 /*******************************************************************************
1734  *
1735  * FUNCTION:    acpi_os_release_object
1736  *
1737  * PARAMETERS:  Cache       - Handle to cache object
1738  *              Object      - The object to be released
1739  *
1740  * RETURN:      None
1741  *
1742  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1743  *              the object is deleted.
1744  *
1745  ******************************************************************************/
1746
1747 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1748 {
1749         kmem_cache_free(cache, object);
1750         return (AE_OK);
1751 }
1752 #endif
1753
1754 static int __init acpi_no_auto_ssdt_setup(char *s)
1755 {
1756         printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n");
1757
1758         acpi_gbl_disable_ssdt_table_load = TRUE;
1759
1760         return 1;
1761 }
1762
1763 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
1764
1765 acpi_status __init acpi_os_initialize(void)
1766 {
1767         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1768         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1769         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1770         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1771
1772         return AE_OK;
1773 }
1774
1775 acpi_status __init acpi_os_initialize1(void)
1776 {
1777         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1778         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1779         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1780         BUG_ON(!kacpid_wq);
1781         BUG_ON(!kacpi_notify_wq);
1782         BUG_ON(!kacpi_hotplug_wq);
1783         acpi_install_interface_handler(acpi_osi_handler);
1784         acpi_osi_setup_late();
1785         return AE_OK;
1786 }
1787
1788 acpi_status acpi_os_terminate(void)
1789 {
1790         if (acpi_irq_handler) {
1791                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1792                                                  acpi_irq_handler);
1793         }
1794
1795         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1796         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1797         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1798         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1799
1800         destroy_workqueue(kacpid_wq);
1801         destroy_workqueue(kacpi_notify_wq);
1802         destroy_workqueue(kacpi_hotplug_wq);
1803
1804         return AE_OK;
1805 }
1806
1807 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1808                                   u32 pm1b_control)
1809 {
1810         int rc = 0;
1811         if (__acpi_os_prepare_sleep)
1812                 rc = __acpi_os_prepare_sleep(sleep_state,
1813                                              pm1a_control, pm1b_control);
1814         if (rc < 0)
1815                 return AE_ERROR;
1816         else if (rc > 0)
1817                 return AE_CTRL_SKIP;
1818
1819         return AE_OK;
1820 }
1821
1822 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1823                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1824 {
1825         __acpi_os_prepare_sleep = func;
1826 }
1827
1828 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1829                                   u32 val_b)
1830 {
1831         int rc = 0;
1832         if (__acpi_os_prepare_extended_sleep)
1833                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1834                                              val_a, val_b);
1835         if (rc < 0)
1836                 return AE_ERROR;
1837         else if (rc > 0)
1838                 return AE_CTRL_SKIP;
1839
1840         return AE_OK;
1841 }
1842
1843 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1844                                u32 val_a, u32 val_b))
1845 {
1846         __acpi_os_prepare_extended_sleep = func;
1847 }
1848
1849
1850 void alloc_acpi_hp_work(acpi_handle handle, u32 type, void *context,
1851                         void (*func)(struct work_struct *work))
1852 {
1853         struct acpi_hp_work *hp_work;
1854         int ret;
1855
1856         hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1857         if (!hp_work)
1858                 return;
1859
1860         hp_work->handle = handle;
1861         hp_work->type = type;
1862         hp_work->context = context;
1863
1864         INIT_WORK(&hp_work->work, func);
1865         ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1866         if (!ret)
1867                 kfree(hp_work);
1868 }
1869 EXPORT_SYMBOL_GPL(alloc_acpi_hp_work);