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 <[email protected]>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
   7  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <[email protected]>
   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         acpi_rsdp = simple_strtoul(arg, NULL, 16);
 239         return 0;
 240 }
 241 early_param("acpi_rsdp", setup_acpi_rsdp);
 242 #endif
 243
 244 acpi_physical_address __init acpi_os_get_root_pointer(void)
 245 {
 246 #ifdef CONFIG_KEXEC
 247         if (acpi_rsdp)
 248                 return acpi_rsdp;
 249 #endif
 250
 251         if (efi_enabled(EFI_CONFIG_TABLES)) {
 252                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 253                         return efi.acpi20;
 254                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 255                         return efi.acpi;
 256                 else {
 257                         printk(KERN_ERR PREFIX
 258                                "System description tables not found\n");
 259                         return 0;
 260                 }
 261         } else {
 262                 acpi_physical_address pa = 0;
 263
 264                 acpi_find_root_pointer(&pa);
 265                 return pa;
 266         }
 267 }
 268
 269 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 270 static struct acpi_ioremap *
 271 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 272 {
 273         struct acpi_ioremap *map;
 274
 275         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 276                 if (map->phys <= phys &&
 277                     phys + size <= map->phys + map->size)
 278                         return map;
 279
 280         return NULL;
 281 }
 282
 283 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 284 static void __iomem *
 285 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 286 {
 287         struct acpi_ioremap *map;
 288
 289         map = acpi_map_lookup(phys, size);
 290         if (map)
 291                 return map->virt + (phys - map->phys);
 292
 293         return NULL;
 294 }
 295
 296 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 297 {
 298         struct acpi_ioremap *map;
 299         void __iomem *virt = NULL;
 300
 301         mutex_lock(&acpi_ioremap_lock);
 302         map = acpi_map_lookup(phys, size);
 303         if (map) {
 304                 virt = map->virt + (phys - map->phys);
 305                 map->refcount++;
 306         }
 307         mutex_unlock(&acpi_ioremap_lock);
 308         return virt;
 309 }
 310 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 311
 312 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 313 static struct acpi_ioremap *
 314 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 315 {
 316         struct acpi_ioremap *map;
 317
 318         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 319                 if (map->virt <= virt &&
 320                     virt + size <= map->virt + map->size)
 321                         return map;
 322
 323         return NULL;
 324 }
 325
 326 #ifndef CONFIG_IA64
 327 #define should_use_kmap(pfn)   page_is_ram(pfn)
 328 #else
 329 /* ioremap will take care of cache attributes */
 330 #define should_use_kmap(pfn)   0
 331 #endif
 332
 333 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 334 {
 335         unsigned long pfn;
 336
 337         pfn = pg_off >> PAGE_SHIFT;
 338         if (should_use_kmap(pfn)) {
 339                 if (pg_sz > PAGE_SIZE)
 340                         return NULL;
 341                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 342         } else
 343                 return acpi_os_ioremap(pg_off, pg_sz);
 344 }
 345
 346 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 347 {
 348         unsigned long pfn;
 349
 350         pfn = pg_off >> PAGE_SHIFT;
 351         if (should_use_kmap(pfn))
 352                 kunmap(pfn_to_page(pfn));
 353         else
 354                 iounmap(vaddr);
 355 }
 356
 357 void __iomem *__init_refok
 358 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
 359 {
 360         struct acpi_ioremap *map;
 361         void __iomem *virt;
 362         acpi_physical_address pg_off;
 363         acpi_size pg_sz;
 364
 365         if (phys > ULONG_MAX) {
 366                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 367                 return NULL;
 368         }
 369
 370         if (!acpi_gbl_permanent_mmap)
 371                 return __acpi_map_table((unsigned long)phys, size);
 372
 373         mutex_lock(&acpi_ioremap_lock);
 374         /* Check if there's a suitable mapping already. */
 375         map = acpi_map_lookup(phys, size);
 376         if (map) {
 377                 map->refcount++;
 378                 goto out;
 379         }
 380
 381         map = kzalloc(sizeof(*map), GFP_KERNEL);
 382         if (!map) {
 383                 mutex_unlock(&acpi_ioremap_lock);
 384                 return NULL;
 385         }
 386
 387         pg_off = round_down(phys, PAGE_SIZE);
 388         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 389         virt = acpi_map(pg_off, pg_sz);
 390         if (!virt) {
 391                 mutex_unlock(&acpi_ioremap_lock);
 392                 kfree(map);
 393                 return NULL;
 394         }
 395
 396         INIT_LIST_HEAD(&map->list);
 397         map->virt = virt;
 398         map->phys = pg_off;
 399         map->size = pg_sz;
 400         map->refcount = 1;
 401
 402         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 403
 404 out:
 405         mutex_unlock(&acpi_ioremap_lock);
 406         return map->virt + (phys - map->phys);
 407 }
 408 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
 409
 410 void *__init_refok
 411 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 412 {
 413         return (void *)acpi_os_map_iomem(phys, size);
 414 }
 415 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 416
 417 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 418 {
 419         if (!--map->refcount)
 420                 list_del_rcu(&map->list);
 421 }
 422
 423 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 424 {
 425         if (!map->refcount) {
 426                 synchronize_rcu();
 427                 acpi_unmap(map->phys, map->virt);
 428                 kfree(map);
 429         }
 430 }
 431
 432 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
 433 {
 434         struct acpi_ioremap *map;
 435
 436         if (!acpi_gbl_permanent_mmap) {
 437                 __acpi_unmap_table(virt, size);
 438                 return;
 439         }
 440
 441         mutex_lock(&acpi_ioremap_lock);
 442         map = acpi_map_lookup_virt(virt, size);
 443         if (!map) {
 444                 mutex_unlock(&acpi_ioremap_lock);
 445                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 446                 return;
 447         }
 448         acpi_os_drop_map_ref(map);
 449         mutex_unlock(&acpi_ioremap_lock);
 450
 451         acpi_os_map_cleanup(map);
 452 }
 453 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
 454
 455 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
 456 {
 457         return acpi_os_unmap_iomem((void __iomem *)virt, size);
 458 }
 459 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 460
 461 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 462 {
 463         if (!acpi_gbl_permanent_mmap)
 464                 __acpi_unmap_table(virt, size);
 465 }
 466
 467 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 468 {
 469         u64 addr;
 470         void __iomem *virt;
 471
 472         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 473                 return 0;
 474
 475         /* Handle possible alignment issues */
 476         memcpy(&addr, &gas->address, sizeof(addr));
 477         if (!addr || !gas->bit_width)
 478                 return -EINVAL;
 479
 480         virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
 481         if (!virt)
 482                 return -EIO;
 483
 484         return 0;
 485 }
 486 EXPORT_SYMBOL(acpi_os_map_generic_address);
 487
 488 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 489 {
 490         u64 addr;
 491         struct acpi_ioremap *map;
 492
 493         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 494                 return;
 495
 496         /* Handle possible alignment issues */
 497         memcpy(&addr, &gas->address, sizeof(addr));
 498         if (!addr || !gas->bit_width)
 499                 return;
 500
 501         mutex_lock(&acpi_ioremap_lock);
 502         map = acpi_map_lookup(addr, gas->bit_width / 8);
 503         if (!map) {
 504                 mutex_unlock(&acpi_ioremap_lock);
 505                 return;
 506         }
 507         acpi_os_drop_map_ref(map);
 508         mutex_unlock(&acpi_ioremap_lock);
 509
 510         acpi_os_map_cleanup(map);
 511 }
 512 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 513
 514 #ifdef ACPI_FUTURE_USAGE
 515 acpi_status
 516 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 517 {
 518         if (!phys || !virt)
 519                 return AE_BAD_PARAMETER;
 520
 521         *phys = virt_to_phys(virt);
 522
 523         return AE_OK;
 524 }
 525 #endif
 526
 527 #define ACPI_MAX_OVERRIDE_LEN 100
 528
 529 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 530
 531 acpi_status
 532 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 533                             acpi_string * new_val)
 534 {
 535         if (!init_val || !new_val)
 536                 return AE_BAD_PARAMETER;
 537
 538         *new_val = NULL;
 539         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 540                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 541                        acpi_os_name);
 542                 *new_val = acpi_os_name;
 543         }
 544
 545         return AE_OK;
 546 }
 547
 548 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 549 #include <linux/earlycpio.h>
 550 #include <linux/memblock.h>
 551
 552 static u64 acpi_tables_addr;
 553 static int all_tables_size;
 554
 555 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 556 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 557 {
 558         u8 sum = 0;
 559         u8 *end = buffer + length;
 560
 561         while (buffer < end)
 562                 sum = (u8) (sum + *(buffer++));
 563         return sum;
 564 }
 565
 566 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 567 static const char * const table_sigs[] = {
 568         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 569         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 570         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 571         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 572         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 573         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 574         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 575         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 576         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 577
 578 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 579
 580 #define ACPI_OVERRIDE_TABLES 64
 581 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
 582
 583 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 584
 585 void __init acpi_initrd_override(void *data, size_t size)
 586 {
 587         int sig, no, table_nr = 0, total_offset = 0;
 588         long offset = 0;
 589         struct acpi_table_header *table;
 590         char cpio_path[32] = "kernel/firmware/acpi/";
 591         struct cpio_data file;
 592
 593         if (data == NULL || size == 0)
 594                 return;
 595
 596         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 597                 file = find_cpio_data(cpio_path, data, size, &offset);
 598                 if (!file.data)
 599                         break;
 600
 601                 data += offset;
 602                 size -= offset;
 603
 604                 if (file.size < sizeof(struct acpi_table_header)) {
 605                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 606                                 cpio_path, file.name);
 607                         continue;
 608                 }
 609
 610                 table = file.data;
 611
 612                 for (sig = 0; table_sigs[sig]; sig++)
 613                         if (!memcmp(table->signature, table_sigs[sig], 4))
 614                                 break;
 615
 616                 if (!table_sigs[sig]) {
 617                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 618                                 cpio_path, file.name);
 619                         continue;
 620                 }
 621                 if (file.size != table->length) {
 622                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 623                                 cpio_path, file.name);
 624                         continue;
 625                 }
 626                 if (acpi_table_checksum(file.data, table->length)) {
 627                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 628                                 cpio_path, file.name);
 629                         continue;
 630                 }
 631
 632                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 633                         table->signature, cpio_path, file.name, table->length);
 634
 635                 all_tables_size += table->length;
 636                 acpi_initrd_files[table_nr].data = file.data;
 637                 acpi_initrd_files[table_nr].size = file.size;
 638                 table_nr++;
 639         }
 640         if (table_nr == 0)
 641                 return;
 642
 643         acpi_tables_addr =
 644                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 645                                        all_tables_size, PAGE_SIZE);
 646         if (!acpi_tables_addr) {
 647                 WARN_ON(1);
 648                 return;
 649         }
 650         /*
 651          * Only calling e820_add_reserve does not work and the
 652          * tables are invalid (memory got used) later.
 653          * memblock_reserve works as expected and the tables won't get modified.
 654          * But it's not enough on X86 because ioremap will
 655          * complain later (used by acpi_os_map_memory) that the pages
 656          * that should get mapped are not marked "reserved".
 657          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 658          * works fine.
 659          */
 660         memblock_reserve(acpi_tables_addr, all_tables_size);
 661         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 662
 663         /*
 664          * early_ioremap only can remap 256k one time. If we map all
 665          * tables one time, we will hit the limit. Need to map chunks
 666          * one by one during copying the same as that in relocate_initrd().
 667          */
 668         for (no = 0; no < table_nr; no++) {
 669                 unsigned char *src_p = acpi_initrd_files[no].data;
 670                 phys_addr_t size = acpi_initrd_files[no].size;
 671                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 672                 phys_addr_t slop, clen;
 673                 char *dest_p;
 674
 675                 total_offset += size;
 676
 677                 while (size) {
 678                         slop = dest_addr & ~PAGE_MASK;
 679                         clen = size;
 680                         if (clen > MAP_CHUNK_SIZE - slop)
 681                                 clen = MAP_CHUNK_SIZE - slop;
 682                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
 683                                                  clen + slop);
 684                         memcpy(dest_p + slop, src_p, clen);
 685                         early_iounmap(dest_p, clen + slop);
 686                         src_p += clen;
 687                         dest_addr += clen;
 688                         size -= clen;
 689                 }
 690         }
 691 }
 692 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 693
 694 static void acpi_table_taint(struct acpi_table_header *table)
 695 {
 696         pr_warn(PREFIX
 697                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 698                 table->signature, table->oem_table_id);
 699         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 700 }
 701
 702
 703 acpi_status
 704 acpi_os_table_override(struct acpi_table_header * existing_table,
 705                        struct acpi_table_header ** new_table)
 706 {
 707         if (!existing_table || !new_table)
 708                 return AE_BAD_PARAMETER;
 709
 710         *new_table = NULL;
 711
 712 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 713         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 714                 *new_table = (struct acpi_table_header *)AmlCode;
 715 #endif
 716         if (*new_table != NULL)
 717                 acpi_table_taint(existing_table);
 718         return AE_OK;
 719 }
 720
 721 acpi_status
 722 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 723                                 acpi_physical_address *address,
 724                                 u32 *table_length)
 725 {
 726 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 727         *table_length = 0;
 728         *address = 0;
 729         return AE_OK;
 730 #else
 731         int table_offset = 0;
 732         struct acpi_table_header *table;
 733
 734         *table_length = 0;
 735         *address = 0;
 736
 737         if (!acpi_tables_addr)
 738                 return AE_OK;
 739
 740         do {
 741                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 742                         WARN_ON(1);
 743                         return AE_OK;
 744                 }
 745
 746                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 747                                            ACPI_HEADER_SIZE);
 748
 749                 if (table_offset + table->length > all_tables_size) {
 750                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 751                         WARN_ON(1);
 752                         return AE_OK;
 753                 }
 754
 755                 table_offset += table->length;
 756
 757                 if (memcmp(existing_table->signature, table->signature, 4)) {
 758                         acpi_os_unmap_memory(table,
 759                                      ACPI_HEADER_SIZE);
 760                         continue;
 761                 }
 762
 763                 /* Only override tables with matching oem id */
 764                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 765                            ACPI_OEM_TABLE_ID_SIZE)) {
 766                         acpi_os_unmap_memory(table,
 767                                      ACPI_HEADER_SIZE);
 768                         continue;
 769                 }
 770
 771                 table_offset -= table->length;
 772                 *table_length = table->length;
 773                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 774                 *address = acpi_tables_addr + table_offset;
 775                 break;
 776         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 777
 778         if (*address != 0)
 779                 acpi_table_taint(existing_table);
 780         return AE_OK;
 781 #endif
 782 }
 783
 784 static irqreturn_t acpi_irq(int irq, void *dev_id)
 785 {
 786         u32 handled;
 787
 788         handled = (*acpi_irq_handler) (acpi_irq_context);
 789
 790         if (handled) {
 791                 acpi_irq_handled++;
 792                 return IRQ_HANDLED;
 793         } else {
 794                 acpi_irq_not_handled++;
 795                 return IRQ_NONE;
 796         }
 797 }
 798
 799 acpi_status
 800 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 801                                   void *context)
 802 {
 803         unsigned int irq;
 804
 805         acpi_irq_stats_init();
 806
 807         /*
 808          * ACPI interrupts different from the SCI in our copy of the FADT are
 809          * not supported.
 810          */
 811         if (gsi != acpi_gbl_FADT.sci_interrupt)
 812                 return AE_BAD_PARAMETER;
 813
 814         if (acpi_irq_handler)
 815                 return AE_ALREADY_ACQUIRED;
 816
 817         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 818                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 819                        gsi);
 820                 return AE_OK;
 821         }
 822
 823         acpi_irq_handler = handler;
 824         acpi_irq_context = context;
 825         if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
 826                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 827                 acpi_irq_handler = NULL;
 828                 return AE_NOT_ACQUIRED;
 829         }
 830
 831         return AE_OK;
 832 }
 833
 834 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 835 {
 836         if (irq != acpi_gbl_FADT.sci_interrupt)
 837                 return AE_BAD_PARAMETER;
 838
 839         free_irq(irq, acpi_irq);
 840         acpi_irq_handler = NULL;
 841
 842         return AE_OK;
 843 }
 844
 845 /*
 846  * Running in interpreter thread context, safe to sleep
 847  */
 848
 849 void acpi_os_sleep(u64 ms)
 850 {
 851         msleep(ms);
 852 }
 853
 854 void acpi_os_stall(u32 us)
 855 {
 856         while (us) {
 857                 u32 delay = 1000;
 858
 859                 if (delay > us)
 860                         delay = us;
 861                 udelay(delay);
 862                 touch_nmi_watchdog();
 863                 us -= delay;
 864         }
 865 }
 866
 867 /*
 868  * Support ACPI 3.0 AML Timer operand
 869  * Returns 64-bit free-running, monotonically increasing timer
 870  * with 100ns granularity
 871  */
 872 u64 acpi_os_get_timer(void)
 873 {
 874         u64 time_ns = ktime_to_ns(ktime_get());
 875         do_div(time_ns, 100);
 876         return time_ns;
 877 }
 878
 879 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 880 {
 881         u32 dummy;
 882
 883         if (!value)
 884                 value = &dummy;
 885
 886         *value = 0;
 887         if (width <= 8) {
 888                 *(u8 *) value = inb(port);
 889         } else if (width <= 16) {
 890                 *(u16 *) value = inw(port);
 891         } else if (width <= 32) {
 892                 *(u32 *) value = inl(port);
 893         } else {
 894                 BUG();
 895         }
 896
 897         return AE_OK;
 898 }
 899
 900 EXPORT_SYMBOL(acpi_os_read_port);
 901
 902 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 903 {
 904         if (width <= 8) {
 905                 outb(value, port);
 906         } else if (width <= 16) {
 907                 outw(value, port);
 908         } else if (width <= 32) {
 909                 outl(value, port);
 910         } else {
 911                 BUG();
 912         }
 913
 914         return AE_OK;
 915 }
 916
 917 EXPORT_SYMBOL(acpi_os_write_port);
 918
 919 #ifdef readq
 920 static inline u64 read64(const volatile void __iomem *addr)
 921 {
 922         return readq(addr);
 923 }
 924 #else
 925 static inline u64 read64(const volatile void __iomem *addr)
 926 {
 927         u64 l, h;
 928         l = readl(addr);
 929         h = readl(addr+4);
 930         return l | (h << 32);
 931 }
 932 #endif
 933
 934 acpi_status
 935 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 936 {
 937         void __iomem *virt_addr;
 938         unsigned int size = width / 8;
 939         bool unmap = false;
 940         u64 dummy;
 941
 942         rcu_read_lock();
 943         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 944         if (!virt_addr) {
 945                 rcu_read_unlock();
 946                 virt_addr = acpi_os_ioremap(phys_addr, size);
 947                 if (!virt_addr)
 948                         return AE_BAD_ADDRESS;
 949                 unmap = true;
 950         }
 951
 952         if (!value)
 953                 value = &dummy;
 954
 955         switch (width) {
 956         case 8:
 957                 *(u8 *) value = readb(virt_addr);
 958                 break;
 959         case 16:
 960                 *(u16 *) value = readw(virt_addr);
 961                 break;
 962         case 32:
 963                 *(u32 *) value = readl(virt_addr);
 964                 break;
 965         case 64:
 966                 *(u64 *) value = read64(virt_addr);
 967                 break;
 968         default:
 969                 BUG();
 970         }
 971
 972         if (unmap)
 973                 iounmap(virt_addr);
 974         else
 975                 rcu_read_unlock();
 976
 977         return AE_OK;
 978 }
 979
 980 #ifdef writeq
 981 static inline void write64(u64 val, volatile void __iomem *addr)
 982 {
 983         writeq(val, addr);
 984 }
 985 #else
 986 static inline void write64(u64 val, volatile void __iomem *addr)
 987 {
 988         writel(val, addr);
 989         writel(val>>32, addr+4);
 990 }
 991 #endif
 992
 993 acpi_status
 994 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 995 {
 996         void __iomem *virt_addr;
 997         unsigned int size = width / 8;
 998         bool unmap = false;
 999
1000         rcu_read_lock();
1001         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1002         if (!virt_addr) {
1003                 rcu_read_unlock();
1004                 virt_addr = acpi_os_ioremap(phys_addr, size);
1005                 if (!virt_addr)
1006                         return AE_BAD_ADDRESS;
1007                 unmap = true;
1008         }
1009
1010         switch (width) {
1011         case 8:
1012                 writeb(value, virt_addr);
1013                 break;
1014         case 16:
1015                 writew(value, virt_addr);
1016                 break;
1017         case 32:
1018                 writel(value, virt_addr);
1019                 break;
1020         case 64:
1021                 write64(value, virt_addr);
1022                 break;
1023         default:
1024                 BUG();
1025         }
1026
1027         if (unmap)
1028                 iounmap(virt_addr);
1029         else
1030                 rcu_read_unlock();
1031
1032         return AE_OK;
1033 }
1034
1035 acpi_status
1036 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1037                                u64 *value, u32 width)
1038 {
1039         int result, size;
1040         u32 value32;
1041
1042         if (!value)
1043                 return AE_BAD_PARAMETER;
1044
1045         switch (width) {
1046         case 8:
1047                 size = 1;
1048                 break;
1049         case 16:
1050                 size = 2;
1051                 break;
1052         case 32:
1053                 size = 4;
1054                 break;
1055         default:
1056                 return AE_ERROR;
1057         }
1058
1059         result = raw_pci_read(pci_id->segment, pci_id->bus,
1060                                 PCI_DEVFN(pci_id->device, pci_id->function),
1061                                 reg, size, &value32);
1062         *value = value32;
1063
1064         return (result ? AE_ERROR : AE_OK);
1065 }
1066
1067 acpi_status
1068 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1069                                 u64 value, u32 width)
1070 {
1071         int result, size;
1072
1073         switch (width) {
1074         case 8:
1075                 size = 1;
1076                 break;
1077         case 16:
1078                 size = 2;
1079                 break;
1080         case 32:
1081                 size = 4;
1082                 break;
1083         default:
1084                 return AE_ERROR;
1085         }
1086
1087         result = raw_pci_write(pci_id->segment, pci_id->bus,
1088                                 PCI_DEVFN(pci_id->device, pci_id->function),
1089                                 reg, size, value);
1090
1091         return (result ? AE_ERROR : AE_OK);
1092 }
1093
1094 static void acpi_os_execute_deferred(struct work_struct *work)
1095 {
1096         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1097
1098         dpc->function(dpc->context);
1099         kfree(dpc);
1100 }
1101
1102 /*******************************************************************************
1103  *
1104  * FUNCTION:    acpi_os_execute
1105  *
1106  * PARAMETERS:  Type               - Type of the callback
1107  *              Function           - Function to be executed
1108  *              Context            - Function parameters
1109  *
1110  * RETURN:      Status
1111  *
1112  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1113  *              immediately executes function on a separate thread.
1114  *
1115  ******************************************************************************/
1116
1117 acpi_status acpi_os_execute(acpi_execute_type type,
1118                             acpi_osd_exec_callback function, void *context)
1119 {
1120         acpi_status status = AE_OK;
1121         struct acpi_os_dpc *dpc;
1122         struct workqueue_struct *queue;
1123         int ret;
1124         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1125                           "Scheduling function [%p(%p)] for deferred execution.\n",
1126                           function, context));
1127
1128         /*
1129          * Allocate/initialize DPC structure.  Note that this memory will be
1130          * freed by the callee.  The kernel handles the work_struct list  in a
1131          * way that allows us to also free its memory inside the callee.
1132          * Because we may want to schedule several tasks with different
1133          * parameters we can't use the approach some kernel code uses of
1134          * having a static work_struct.
1135          */
1136
1137         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1138         if (!dpc)
1139                 return AE_NO_MEMORY;
1140
1141         dpc->function = function;
1142         dpc->context = context;
1143
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 (type == OSL_NOTIFY_HANDLER) {
1150                 queue = kacpi_notify_wq;
1151                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1152         } else {
1153                 queue = kacpid_wq;
1154                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1155         }
1156
1157         /*
1158          * On some machines, a software-initiated SMI causes corruption unless
1159          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1160          * typically it's done in GPE-related methods that are run via
1161          * workqueues, so we can avoid the known corruption cases by always
1162          * queueing on CPU 0.
1163          */
1164         ret = queue_work_on(0, queue, &dpc->work);
1165
1166         if (!ret) {
1167                 printk(KERN_ERR PREFIX
1168                           "Call to queue_work() failed.\n");
1169                 status = AE_ERROR;
1170                 kfree(dpc);
1171         }
1172         return status;
1173 }
1174 EXPORT_SYMBOL(acpi_os_execute);
1175
1176 void acpi_os_wait_events_complete(void)
1177 {
1178         flush_workqueue(kacpid_wq);
1179         flush_workqueue(kacpi_notify_wq);
1180 }
1181
1182 struct acpi_hp_work {
1183         struct work_struct work;
1184         struct acpi_device *adev;
1185         u32 src;
1186 };
1187
1188 static void acpi_hotplug_work_fn(struct work_struct *work)
1189 {
1190         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1191
1192         acpi_os_wait_events_complete();
1193         acpi_device_hotplug(hpw->adev, hpw->src);
1194         kfree(hpw);
1195 }
1196
1197 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1198 {
1199         struct acpi_hp_work *hpw;
1200
1201         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1202                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1203                   adev, src));
1204
1205         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1206         if (!hpw)
1207                 return AE_NO_MEMORY;
1208
1209         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1210         hpw->adev = adev;
1211         hpw->src = src;
1212         /*
1213          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1214          * the hotplug code may call driver .remove() functions, which may
1215          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1216          * these workqueues.
1217          */
1218         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1219                 kfree(hpw);
1220                 return AE_ERROR;
1221         }
1222         return AE_OK;
1223 }
1224
1225 bool acpi_queue_hotplug_work(struct work_struct *work)
1226 {
1227         return queue_work(kacpi_hotplug_wq, work);
1228 }
1229
1230 acpi_status
1231 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1232 {
1233         struct semaphore *sem = NULL;
1234
1235         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1236         if (!sem)
1237                 return AE_NO_MEMORY;
1238
1239         sema_init(sem, initial_units);
1240
1241         *handle = (acpi_handle *) sem;
1242
1243         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1244                           *handle, initial_units));
1245
1246         return AE_OK;
1247 }
1248
1249 /*
1250  * TODO: A better way to delete semaphores?  Linux doesn't have a
1251  * 'delete_semaphore()' function -- may result in an invalid
1252  * pointer dereference for non-synchronized consumers.  Should
1253  * we at least check for blocked threads and signal/cancel them?
1254  */
1255
1256 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1257 {
1258         struct semaphore *sem = (struct semaphore *)handle;
1259
1260         if (!sem)
1261                 return AE_BAD_PARAMETER;
1262
1263         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1264
1265         BUG_ON(!list_empty(&sem->wait_list));
1266         kfree(sem);
1267         sem = NULL;
1268
1269         return AE_OK;
1270 }
1271
1272 /*
1273  * TODO: Support for units > 1?
1274  */
1275 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1276 {
1277         acpi_status status = AE_OK;
1278         struct semaphore *sem = (struct semaphore *)handle;
1279         long jiffies;
1280         int ret = 0;
1281
1282         if (!sem || (units < 1))
1283                 return AE_BAD_PARAMETER;
1284
1285         if (units > 1)
1286                 return AE_SUPPORT;
1287
1288         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1289                           handle, units, timeout));
1290
1291         if (timeout == ACPI_WAIT_FOREVER)
1292                 jiffies = MAX_SCHEDULE_TIMEOUT;
1293         else
1294                 jiffies = msecs_to_jiffies(timeout);
1295
1296         ret = down_timeout(sem, jiffies);
1297         if (ret)
1298                 status = AE_TIME;
1299
1300         if (ACPI_FAILURE(status)) {
1301                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1302                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1303                                   handle, units, timeout,
1304                                   acpi_format_exception(status)));
1305         } else {
1306                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1307                                   "Acquired semaphore[%p|%d|%d]", handle,
1308                                   units, timeout));
1309         }
1310
1311         return status;
1312 }
1313
1314 /*
1315  * TODO: Support for units > 1?
1316  */
1317 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1318 {
1319         struct semaphore *sem = (struct semaphore *)handle;
1320
1321         if (!sem || (units < 1))
1322                 return AE_BAD_PARAMETER;
1323
1324         if (units > 1)
1325                 return AE_SUPPORT;
1326
1327         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1328                           units));
1329
1330         up(sem);
1331
1332         return AE_OK;
1333 }
1334
1335 #ifdef ACPI_FUTURE_USAGE
1336 u32 acpi_os_get_line(char *buffer)
1337 {
1338
1339 #ifdef ENABLE_DEBUGGER
1340         if (acpi_in_debugger) {
1341                 u32 chars;
1342
1343                 kdb_read(buffer, sizeof(line_buf));
1344
1345                 /* remove the CR kdb includes */
1346                 chars = strlen(buffer) - 1;
1347                 buffer[chars] = '\0';
1348         }
1349 #endif
1350
1351         return 0;
1352 }
1353 #endif                          /*  ACPI_FUTURE_USAGE  */
1354
1355 acpi_status acpi_os_signal(u32 function, void *info)
1356 {
1357         switch (function) {
1358         case ACPI_SIGNAL_FATAL:
1359                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1360                 break;
1361         case ACPI_SIGNAL_BREAKPOINT:
1362                 /*
1363                  * AML Breakpoint
1364                  * ACPI spec. says to treat it as a NOP unless
1365                  * you are debugging.  So if/when we integrate
1366                  * AML debugger into the kernel debugger its
1367                  * hook will go here.  But until then it is
1368                  * not useful to print anything on breakpoints.
1369                  */
1370                 break;
1371         default:
1372                 break;
1373         }
1374
1375         return AE_OK;
1376 }
1377
1378 static int __init acpi_os_name_setup(char *str)
1379 {
1380         char *p = acpi_os_name;
1381         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1382
1383         if (!str || !*str)
1384                 return 0;
1385
1386         for (; count-- && *str; str++) {
1387                 if (isalnum(*str) || *str == ' ' || *str == ':')
1388                         *p++ = *str;
1389                 else if (*str == '\'' || *str == '"')
1390                         continue;
1391                 else
1392                         break;
1393         }
1394         *p = 0;
1395
1396         return 1;
1397
1398 }
1399
1400 __setup("acpi_os_name=", acpi_os_name_setup);
1401
1402 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1403 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1404
1405 struct osi_setup_entry {
1406         char string[OSI_STRING_LENGTH_MAX];
1407         bool enable;
1408 };
1409
1410 static struct osi_setup_entry
1411                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1412         {"Module Device", true},
1413         {"Processor Device", true},
1414         {"3.0 _SCP Extensions", true},
1415         {"Processor Aggregator Device", true},
1416 };
1417
1418 void __init acpi_osi_setup(char *str)
1419 {
1420         struct osi_setup_entry *osi;
1421         bool enable = true;
1422         int i;
1423
1424         if (!acpi_gbl_create_osi_method)
1425                 return;
1426
1427         if (str == NULL || *str == '\0') {
1428                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1429                 acpi_gbl_create_osi_method = FALSE;
1430                 return;
1431         }
1432
1433         if (*str == '!') {
1434                 str++;
1435                 if (*str == '\0') {
1436                         osi_linux.default_disabling = 1;
1437                         return;
1438                 } else if (*str == '*') {
1439                         acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1440                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1441                                 osi = &osi_setup_entries[i];
1442                                 osi->enable = false;
1443                         }
1444                         return;
1445                 }
1446                 enable = false;
1447         }
1448
1449         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1450                 osi = &osi_setup_entries[i];
1451                 if (!strcmp(osi->string, str)) {
1452                         osi->enable = enable;
1453                         break;
1454                 } else if (osi->string[0] == '\0') {
1455                         osi->enable = enable;
1456                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1457                         break;
1458                 }
1459         }
1460 }
1461
1462 static void __init set_osi_linux(unsigned int enable)
1463 {
1464         if (osi_linux.enable != enable)
1465                 osi_linux.enable = enable;
1466
1467         if (osi_linux.enable)
1468                 acpi_osi_setup("Linux");
1469         else
1470                 acpi_osi_setup("!Linux");
1471
1472         return;
1473 }
1474
1475 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1476 {
1477         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1478         osi_linux.dmi = 0;
1479         set_osi_linux(enable);
1480
1481         return;
1482 }
1483
1484 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1485 {
1486         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1487
1488         if (enable == -1)
1489                 return;
1490
1491         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1492         set_osi_linux(enable);
1493
1494         return;
1495 }
1496
1497 /*
1498  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1499  *
1500  * empty string disables _OSI
1501  * string starting with '!' disables that string
1502  * otherwise string is added to list, augmenting built-in strings
1503  */
1504 static void __init acpi_osi_setup_late(void)
1505 {
1506         struct osi_setup_entry *osi;
1507         char *str;
1508         int i;
1509         acpi_status status;
1510
1511         if (osi_linux.default_disabling) {
1512                 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1513
1514                 if (ACPI_SUCCESS(status))
1515                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1516         }
1517
1518         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1519                 osi = &osi_setup_entries[i];
1520                 str = osi->string;
1521
1522                 if (*str == '\0')
1523                         break;
1524                 if (osi->enable) {
1525                         status = acpi_install_interface(str);
1526
1527                         if (ACPI_SUCCESS(status))
1528                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1529                 } else {
1530                         status = acpi_remove_interface(str);
1531
1532                         if (ACPI_SUCCESS(status))
1533                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1534                 }
1535         }
1536 }
1537
1538 static int __init osi_setup(char *str)
1539 {
1540         if (str && !strcmp("Linux", str))
1541                 acpi_cmdline_osi_linux(1);
1542         else if (str && !strcmp("!Linux", str))
1543                 acpi_cmdline_osi_linux(0);
1544         else
1545                 acpi_osi_setup(str);
1546
1547         return 1;
1548 }
1549
1550 __setup("acpi_osi=", osi_setup);
1551
1552 /*
1553  * Disable the auto-serialization of named objects creation methods.
1554  *
1555  * This feature is enabled by default.  It marks the AML control methods
1556  * that contain the opcodes to create named objects as "Serialized".
1557  */
1558 static int __init acpi_no_auto_serialize_setup(char *str)
1559 {
1560         acpi_gbl_auto_serialize_methods = FALSE;
1561         pr_info("ACPI: auto-serialization disabled\n");
1562
1563         return 1;
1564 }
1565
1566 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1567
1568 /* Check of resource interference between native drivers and ACPI
1569  * OperationRegions (SystemIO and System Memory only).
1570  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1571  * in arbitrary AML code and can interfere with legacy drivers.
1572  * acpi_enforce_resources= can be set to:
1573  *
1574  *   - strict (default) (2)
1575  *     -> further driver trying to access the resources will not load
1576  *   - lax              (1)
1577  *     -> further driver trying to access the resources will load, but you
1578  *     get a system message that something might go wrong...
1579  *
1580  *   - no               (0)
1581  *     -> ACPI Operation Region resources will not be registered
1582  *
1583  */
1584 #define ENFORCE_RESOURCES_STRICT 2
1585 #define ENFORCE_RESOURCES_LAX    1
1586 #define ENFORCE_RESOURCES_NO     0
1587
1588 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1589
1590 static int __init acpi_enforce_resources_setup(char *str)
1591 {
1592         if (str == NULL || *str == '\0')
1593                 return 0;
1594
1595         if (!strcmp("strict", str))
1596                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1597         else if (!strcmp("lax", str))
1598                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1599         else if (!strcmp("no", str))
1600                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1601
1602         return 1;
1603 }
1604
1605 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1606
1607 /* Check for resource conflicts between ACPI OperationRegions and native
1608  * drivers */
1609 int acpi_check_resource_conflict(const struct resource *res)
1610 {
1611         acpi_adr_space_type space_id;
1612         acpi_size length;
1613         u8 warn = 0;
1614         int clash = 0;
1615
1616         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1617                 return 0;
1618         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1619                 return 0;
1620
1621         if (res->flags & IORESOURCE_IO)
1622                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1623         else
1624                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1625
1626         length = resource_size(res);
1627         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1628                 warn = 1;
1629         clash = acpi_check_address_range(space_id, res->start, length, warn);
1630
1631         if (clash) {
1632                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1633                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1634                                 printk(KERN_NOTICE "ACPI: This conflict may"
1635                                        " cause random problems and system"
1636                                        " instability\n");
1637                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1638                                " for this device, you should use it instead of"
1639                                " the native driver\n");
1640                 }
1641                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1642                         return -EBUSY;
1643         }
1644         return 0;
1645 }
1646 EXPORT_SYMBOL(acpi_check_resource_conflict);
1647
1648 int acpi_check_region(resource_size_t start, resource_size_t n,
1649                       const char *name)
1650 {
1651         struct resource res = {
1652                 .start = start,
1653                 .end   = start + n - 1,
1654                 .name  = name,
1655                 .flags = IORESOURCE_IO,
1656         };
1657
1658         return acpi_check_resource_conflict(&res);
1659 }
1660 EXPORT_SYMBOL(acpi_check_region);
1661
1662 /*
1663  * Let drivers know whether the resource checks are effective
1664  */
1665 int acpi_resources_are_enforced(void)
1666 {
1667         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1668 }
1669 EXPORT_SYMBOL(acpi_resources_are_enforced);
1670
1671 /*
1672  * Deallocate the memory for a spinlock.
1673  */
1674 void acpi_os_delete_lock(acpi_spinlock handle)
1675 {
1676         ACPI_FREE(handle);
1677 }
1678
1679 /*
1680  * Acquire a spinlock.
1681  *
1682  * handle is a pointer to the spinlock_t.
1683  */
1684
1685 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1686 {
1687         acpi_cpu_flags flags;
1688         spin_lock_irqsave(lockp, flags);
1689         return flags;
1690 }
1691
1692 /*
1693  * Release a spinlock. See above.
1694  */
1695
1696 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1697 {
1698         spin_unlock_irqrestore(lockp, flags);
1699 }
1700
1701 #ifndef ACPI_USE_LOCAL_CACHE
1702
1703 /*******************************************************************************
1704  *
1705  * FUNCTION:    acpi_os_create_cache
1706  *
1707  * PARAMETERS:  name      - Ascii name for the cache
1708  *              size      - Size of each cached object
1709  *              depth     - Maximum depth of the cache (in objects) <ignored>
1710  *              cache     - Where the new cache object is returned
1711  *
1712  * RETURN:      status
1713  *
1714  * DESCRIPTION: Create a cache object
1715  *
1716  ******************************************************************************/
1717
1718 acpi_status
1719 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1720 {
1721         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1722         if (*cache == NULL)
1723                 return AE_ERROR;
1724         else
1725                 return AE_OK;
1726 }
1727
1728 /*******************************************************************************
1729  *
1730  * FUNCTION:    acpi_os_purge_cache
1731  *
1732  * PARAMETERS:  Cache           - Handle to cache object
1733  *
1734  * RETURN:      Status
1735  *
1736  * DESCRIPTION: Free all objects within the requested cache.
1737  *
1738  ******************************************************************************/
1739
1740 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1741 {
1742         kmem_cache_shrink(cache);
1743         return (AE_OK);
1744 }
1745
1746 /*******************************************************************************
1747  *
1748  * FUNCTION:    acpi_os_delete_cache
1749  *
1750  * PARAMETERS:  Cache           - Handle to cache object
1751  *
1752  * RETURN:      Status
1753  *
1754  * DESCRIPTION: Free all objects within the requested cache and delete the
1755  *              cache object.
1756  *
1757  ******************************************************************************/
1758
1759 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1760 {
1761         kmem_cache_destroy(cache);
1762         return (AE_OK);
1763 }
1764
1765 /*******************************************************************************
1766  *
1767  * FUNCTION:    acpi_os_release_object
1768  *
1769  * PARAMETERS:  Cache       - Handle to cache object
1770  *              Object      - The object to be released
1771  *
1772  * RETURN:      None
1773  *
1774  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1775  *              the object is deleted.
1776  *
1777  ******************************************************************************/
1778
1779 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1780 {
1781         kmem_cache_free(cache, object);
1782         return (AE_OK);
1783 }
1784 #endif
1785
1786 static int __init acpi_no_static_ssdt_setup(char *s)
1787 {
1788         acpi_gbl_disable_ssdt_table_install = TRUE;
1789         pr_info("ACPI: static SSDT installation disabled\n");
1790
1791         return 0;
1792 }
1793
1794 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1795
1796 static int __init acpi_disable_return_repair(char *s)
1797 {
1798         printk(KERN_NOTICE PREFIX
1799                "ACPI: Predefined validation mechanism disabled\n");
1800         acpi_gbl_disable_auto_repair = TRUE;
1801
1802         return 1;
1803 }
1804
1805 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1806
1807 acpi_status __init acpi_os_initialize(void)
1808 {
1809         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1810         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1811         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1812         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1813         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1814                 /*
1815                  * Use acpi_os_map_generic_address to pre-map the reset
1816                  * register if it's in system memory.
1817                  */
1818                 int rv;
1819
1820                 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1821                 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1822         }
1823
1824         return AE_OK;
1825 }
1826
1827 acpi_status __init acpi_os_initialize1(void)
1828 {
1829         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1830         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1831         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1832         BUG_ON(!kacpid_wq);
1833         BUG_ON(!kacpi_notify_wq);
1834         BUG_ON(!kacpi_hotplug_wq);
1835         acpi_install_interface_handler(acpi_osi_handler);
1836         acpi_osi_setup_late();
1837         return AE_OK;
1838 }
1839
1840 acpi_status acpi_os_terminate(void)
1841 {
1842         if (acpi_irq_handler) {
1843                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1844                                                  acpi_irq_handler);
1845         }
1846
1847         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1848         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1849         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1850         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1851         if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1852                 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1853
1854         destroy_workqueue(kacpid_wq);
1855         destroy_workqueue(kacpi_notify_wq);
1856         destroy_workqueue(kacpi_hotplug_wq);
1857
1858         return AE_OK;
1859 }
1860
1861 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1862                                   u32 pm1b_control)
1863 {
1864         int rc = 0;
1865         if (__acpi_os_prepare_sleep)
1866                 rc = __acpi_os_prepare_sleep(sleep_state,
1867                                              pm1a_control, pm1b_control);
1868         if (rc < 0)
1869                 return AE_ERROR;
1870         else if (rc > 0)
1871                 return AE_CTRL_SKIP;
1872
1873         return AE_OK;
1874 }
1875
1876 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1877                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1878 {
1879         __acpi_os_prepare_sleep = func;
1880 }
1881
1882 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1883                                   u32 val_b)
1884 {
1885         int rc = 0;
1886         if (__acpi_os_prepare_extended_sleep)
1887                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1888                                              val_a, val_b);
1889         if (rc < 0)
1890                 return AE_ERROR;
1891         else if (rc > 0)
1892                 return AE_CTRL_SKIP;
1893
1894         return AE_OK;
1895 }
1896
1897 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1898                                u32 val_a, u32 val_b))
1899 {
1900         __acpi_os_prepare_extended_sleep = func;
1901 }