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
  56 #define _COMPONENT              ACPI_OS_SERVICES
  57 ACPI_MODULE_NAME("osl");
  58 #define PREFIX          "ACPI: "
  59 struct acpi_os_dpc {
  60         acpi_osd_exec_callback function;
  61         void *context;
  62         struct work_struct work;
  63         int wait;
  64 };
  65
  66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  68 #endif
  69
  70 #ifdef ENABLE_DEBUGGER
  71 #include <linux/kdb.h>
  72
  73 /* stuff for debugger support */
  74 int acpi_in_debugger;
  75 EXPORT_SYMBOL(acpi_in_debugger);
  76
  77 extern char line_buf[80];
  78 #endif                          /*ENABLE_DEBUGGER */
  79
  80 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  81                                       u32 pm1b_ctrl);
  82
  83 static acpi_osd_handler acpi_irq_handler;
  84 static void *acpi_irq_context;
  85 static struct workqueue_struct *kacpid_wq;
  86 static struct workqueue_struct *kacpi_notify_wq;
  87 struct workqueue_struct *kacpi_hotplug_wq;
  88 EXPORT_SYMBOL(kacpi_hotplug_wq);
  89
  90 /*
  91  * This list of permanent mappings is for memory that may be accessed from
  92  * interrupt context, where we can't do the ioremap().
  93  */
  94 struct acpi_ioremap {
  95         struct list_head list;
  96         void __iomem *virt;
  97         acpi_physical_address phys;
  98         acpi_size size;
  99         unsigned long refcount;
 100 };
 101
 102 static LIST_HEAD(acpi_ioremaps);
 103 static DEFINE_MUTEX(acpi_ioremap_lock);
 104
 105 static void __init acpi_osi_setup_late(void);
 106
 107 /*
 108  * The story of _OSI(Linux)
 109  *
 110  * From pre-history through Linux-2.6.22,
 111  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 112  *
 113  * Unfortunately, reference BIOS writers got wind of this
 114  * and put OSI(Linux) in their example code, quickly exposing
 115  * this string as ill-conceived and opening the door to
 116  * an un-bounded number of BIOS incompatibilities.
 117  *
 118  * For example, OSI(Linux) was used on resume to re-POST a
 119  * video card on one system, because Linux at that time
 120  * could not do a speedy restore in its native driver.
 121  * But then upon gaining quick native restore capability,
 122  * Linux has no way to tell the BIOS to skip the time-consuming
 123  * POST -- putting Linux at a permanent performance disadvantage.
 124  * On another system, the BIOS writer used OSI(Linux)
 125  * to infer native OS support for IPMI!  On other systems,
 126  * OSI(Linux) simply got in the way of Linux claiming to
 127  * be compatible with other operating systems, exposing
 128  * BIOS issues such as skipped device initialization.
 129  *
 130  * So "Linux" turned out to be a really poor chose of
 131  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 132  *
 133  * BIOS writers should NOT query _OSI(Linux) on future systems.
 134  * Linux will complain on the console when it sees it, and return FALSE.
 135  * To get Linux to return TRUE for your system  will require
 136  * a kernel source update to add a DMI entry,
 137  * or boot with "acpi_osi=Linux"
 138  */
 139
 140 static struct osi_linux {
 141         unsigned int    enable:1;
 142         unsigned int    dmi:1;
 143         unsigned int    cmdline:1;
 144 } osi_linux = {0, 0, 0};
 145
 146 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 147 {
 148         if (!strcmp("Linux", interface)) {
 149
 150                 printk_once(KERN_NOTICE FW_BUG PREFIX
 151                         "BIOS _OSI(Linux) query %s%s\n",
 152                         osi_linux.enable ? "honored" : "ignored",
 153                         osi_linux.cmdline ? " via cmdline" :
 154                         osi_linux.dmi ? " via DMI" : "");
 155         }
 156
 157         return supported;
 158 }
 159
 160 static void __init acpi_request_region (struct acpi_generic_address *gas,
 161         unsigned int length, char *desc)
 162 {
 163         u64 addr;
 164
 165         /* Handle possible alignment issues */
 166         memcpy(&addr, &gas->address, sizeof(addr));
 167         if (!addr || !length)
 168                 return;
 169
 170         /* Resources are never freed */
 171         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 172                 request_region(addr, length, desc);
 173         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 174                 request_mem_region(addr, length, desc);
 175 }
 176
 177 static int __init acpi_reserve_resources(void)
 178 {
 179         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 180                 "ACPI PM1a_EVT_BLK");
 181
 182         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 183                 "ACPI PM1b_EVT_BLK");
 184
 185         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 186                 "ACPI PM1a_CNT_BLK");
 187
 188         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 189                 "ACPI PM1b_CNT_BLK");
 190
 191         if (acpi_gbl_FADT.pm_timer_length == 4)
 192                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 193
 194         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 195                 "ACPI PM2_CNT_BLK");
 196
 197         /* Length of GPE blocks must be a non-negative multiple of 2 */
 198
 199         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 200                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 201                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 202
 203         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 204                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 205                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 206
 207         return 0;
 208 }
 209 device_initcall(acpi_reserve_resources);
 210
 211 void acpi_os_printf(const char *fmt, ...)
 212 {
 213         va_list args;
 214         va_start(args, fmt);
 215         acpi_os_vprintf(fmt, args);
 216         va_end(args);
 217 }
 218
 219 void acpi_os_vprintf(const char *fmt, va_list args)
 220 {
 221         static char buffer[512];
 222
 223         vsprintf(buffer, fmt, args);
 224
 225 #ifdef ENABLE_DEBUGGER
 226         if (acpi_in_debugger) {
 227                 kdb_printf("%s", buffer);
 228         } else {
 229                 printk(KERN_CONT "%s", buffer);
 230         }
 231 #else
 232         printk(KERN_CONT "%s", buffer);
 233 #endif
 234 }
 235
 236 #ifdef CONFIG_KEXEC
 237 static unsigned long acpi_rsdp;
 238 static int __init setup_acpi_rsdp(char *arg)
 239 {
 240         acpi_rsdp = simple_strtoul(arg, NULL, 16);
 241         return 0;
 242 }
 243 early_param("acpi_rsdp", setup_acpi_rsdp);
 244 #endif
 245
 246 acpi_physical_address __init acpi_os_get_root_pointer(void)
 247 {
 248 #ifdef CONFIG_KEXEC
 249         if (acpi_rsdp)
 250                 return acpi_rsdp;
 251 #endif
 252
 253         if (efi_enabled) {
 254                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 255                         return efi.acpi20;
 256                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 257                         return efi.acpi;
 258                 else {
 259                         printk(KERN_ERR PREFIX
 260                                "System description tables not found\n");
 261                         return 0;
 262                 }
 263         } else {
 264                 acpi_physical_address pa = 0;
 265
 266                 acpi_find_root_pointer(&pa);
 267                 return pa;
 268         }
 269 }
 270
 271 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 272 static struct acpi_ioremap *
 273 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
 274 {
 275         struct acpi_ioremap *map;
 276
 277         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 278                 if (map->phys <= phys &&
 279                     phys + size <= map->phys + map->size)
 280                         return map;
 281
 282         return NULL;
 283 }
 284
 285 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 286 static void __iomem *
 287 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
 288 {
 289         struct acpi_ioremap *map;
 290
 291         map = acpi_map_lookup(phys, size);
 292         if (map)
 293                 return map->virt + (phys - map->phys);
 294
 295         return NULL;
 296 }
 297
 298 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
 299 {
 300         struct acpi_ioremap *map;
 301         void __iomem *virt = NULL;
 302
 303         mutex_lock(&acpi_ioremap_lock);
 304         map = acpi_map_lookup(phys, size);
 305         if (map) {
 306                 virt = map->virt + (phys - map->phys);
 307                 map->refcount++;
 308         }
 309         mutex_unlock(&acpi_ioremap_lock);
 310         return virt;
 311 }
 312 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
 313
 314 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
 315 static struct acpi_ioremap *
 316 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 317 {
 318         struct acpi_ioremap *map;
 319
 320         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
 321                 if (map->virt <= virt &&
 322                     virt + size <= map->virt + map->size)
 323                         return map;
 324
 325         return NULL;
 326 }
 327
 328 #ifndef CONFIG_IA64
 329 #define should_use_kmap(pfn)   page_is_ram(pfn)
 330 #else
 331 /* ioremap will take care of cache attributes */
 332 #define should_use_kmap(pfn)   0
 333 #endif
 334
 335 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
 336 {
 337         unsigned long pfn;
 338
 339         pfn = pg_off >> PAGE_SHIFT;
 340         if (should_use_kmap(pfn)) {
 341                 if (pg_sz > PAGE_SIZE)
 342                         return NULL;
 343                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
 344         } else
 345                 return acpi_os_ioremap(pg_off, pg_sz);
 346 }
 347
 348 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
 349 {
 350         unsigned long pfn;
 351
 352         pfn = pg_off >> PAGE_SHIFT;
 353         if (should_use_kmap(pfn))
 354                 kunmap(pfn_to_page(pfn));
 355         else
 356                 iounmap(vaddr);
 357 }
 358
 359 void __iomem *__init_refok
 360 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 361 {
 362         struct acpi_ioremap *map;
 363         void __iomem *virt;
 364         acpi_physical_address pg_off;
 365         acpi_size pg_sz;
 366
 367         if (phys > ULONG_MAX) {
 368                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 369                 return NULL;
 370         }
 371
 372         if (!acpi_gbl_permanent_mmap)
 373                 return __acpi_map_table((unsigned long)phys, size);
 374
 375         mutex_lock(&acpi_ioremap_lock);
 376         /* Check if there's a suitable mapping already. */
 377         map = acpi_map_lookup(phys, size);
 378         if (map) {
 379                 map->refcount++;
 380                 goto out;
 381         }
 382
 383         map = kzalloc(sizeof(*map), GFP_KERNEL);
 384         if (!map) {
 385                 mutex_unlock(&acpi_ioremap_lock);
 386                 return NULL;
 387         }
 388
 389         pg_off = round_down(phys, PAGE_SIZE);
 390         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
 391         virt = acpi_map(pg_off, pg_sz);
 392         if (!virt) {
 393                 mutex_unlock(&acpi_ioremap_lock);
 394                 kfree(map);
 395                 return NULL;
 396         }
 397
 398         INIT_LIST_HEAD(&map->list);
 399         map->virt = virt;
 400         map->phys = pg_off;
 401         map->size = pg_sz;
 402         map->refcount = 1;
 403
 404         list_add_tail_rcu(&map->list, &acpi_ioremaps);
 405
 406  out:
 407         mutex_unlock(&acpi_ioremap_lock);
 408         return map->virt + (phys - map->phys);
 409 }
 410 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 411
 412 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 413 {
 414         if (!--map->refcount)
 415                 list_del_rcu(&map->list);
 416 }
 417
 418 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 419 {
 420         if (!map->refcount) {
 421                 synchronize_rcu();
 422                 acpi_unmap(map->phys, map->virt);
 423                 kfree(map);
 424         }
 425 }
 426
 427 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 428 {
 429         struct acpi_ioremap *map;
 430
 431         if (!acpi_gbl_permanent_mmap) {
 432                 __acpi_unmap_table(virt, size);
 433                 return;
 434         }
 435
 436         mutex_lock(&acpi_ioremap_lock);
 437         map = acpi_map_lookup_virt(virt, size);
 438         if (!map) {
 439                 mutex_unlock(&acpi_ioremap_lock);
 440                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 441                 return;
 442         }
 443         acpi_os_drop_map_ref(map);
 444         mutex_unlock(&acpi_ioremap_lock);
 445
 446         acpi_os_map_cleanup(map);
 447 }
 448 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 449
 450 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 451 {
 452         if (!acpi_gbl_permanent_mmap)
 453                 __acpi_unmap_table(virt, size);
 454 }
 455
 456 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 457 {
 458         u64 addr;
 459         void __iomem *virt;
 460
 461         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 462                 return 0;
 463
 464         /* Handle possible alignment issues */
 465         memcpy(&addr, &gas->address, sizeof(addr));
 466         if (!addr || !gas->bit_width)
 467                 return -EINVAL;
 468
 469         virt = acpi_os_map_memory(addr, gas->bit_width / 8);
 470         if (!virt)
 471                 return -EIO;
 472
 473         return 0;
 474 }
 475 EXPORT_SYMBOL(acpi_os_map_generic_address);
 476
 477 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 478 {
 479         u64 addr;
 480         struct acpi_ioremap *map;
 481
 482         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 483                 return;
 484
 485         /* Handle possible alignment issues */
 486         memcpy(&addr, &gas->address, sizeof(addr));
 487         if (!addr || !gas->bit_width)
 488                 return;
 489
 490         mutex_lock(&acpi_ioremap_lock);
 491         map = acpi_map_lookup(addr, gas->bit_width / 8);
 492         if (!map) {
 493                 mutex_unlock(&acpi_ioremap_lock);
 494                 return;
 495         }
 496         acpi_os_drop_map_ref(map);
 497         mutex_unlock(&acpi_ioremap_lock);
 498
 499         acpi_os_map_cleanup(map);
 500 }
 501 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 502
 503 #ifdef ACPI_FUTURE_USAGE
 504 acpi_status
 505 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 506 {
 507         if (!phys || !virt)
 508                 return AE_BAD_PARAMETER;
 509
 510         *phys = virt_to_phys(virt);
 511
 512         return AE_OK;
 513 }
 514 #endif
 515
 516 #define ACPI_MAX_OVERRIDE_LEN 100
 517
 518 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 519
 520 acpi_status
 521 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 522                             acpi_string * new_val)
 523 {
 524         if (!init_val || !new_val)
 525                 return AE_BAD_PARAMETER;
 526
 527         *new_val = NULL;
 528         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 529                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 530                        acpi_os_name);
 531                 *new_val = acpi_os_name;
 532         }
 533
 534         return AE_OK;
 535 }
 536
 537 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 538 #include <linux/earlycpio.h>
 539 #include <linux/memblock.h>
 540
 541 static u64 acpi_tables_addr;
 542 static int all_tables_size;
 543
 544 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 545 u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 546 {
 547         u8 sum = 0;
 548         u8 *end = buffer + length;
 549
 550         while (buffer < end)
 551                 sum = (u8) (sum + *(buffer++));
 552         return sum;
 553 }
 554
 555 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 556 static const char * const table_sigs[] = {
 557         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 558         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 559         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 560         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 561         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 562         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 563         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 564         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 565         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 566
 567 /* Non-fatal errors: Affected tables/files are ignored */
 568 #define INVALID_TABLE(x, path, name)                                    \
 569         { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); continue; }
 570
 571 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 572
 573 /* Must not increase 10 or needs code modification below */
 574 #define ACPI_OVERRIDE_TABLES 10
 575
 576 void __init acpi_initrd_override(void *data, size_t size)
 577 {
 578         int sig, no, table_nr = 0, total_offset = 0;
 579         long offset = 0;
 580         struct acpi_table_header *table;
 581         char cpio_path[32] = "kernel/firmware/acpi/";
 582         struct cpio_data file;
 583         struct cpio_data early_initrd_files[ACPI_OVERRIDE_TABLES];
 584         char *p;
 585
 586         if (data == NULL || size == 0)
 587                 return;
 588
 589         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 590                 file = find_cpio_data(cpio_path, data, size, &offset);
 591                 if (!file.data)
 592                         break;
 593
 594                 data += offset;
 595                 size -= offset;
 596
 597                 if (file.size < sizeof(struct acpi_table_header))
 598                         INVALID_TABLE("Table smaller than ACPI header",
 599                                       cpio_path, file.name);
 600
 601                 table = file.data;
 602
 603                 for (sig = 0; table_sigs[sig]; sig++)
 604                         if (!memcmp(table->signature, table_sigs[sig], 4))
 605                                 break;
 606
 607                 if (!table_sigs[sig])
 608                         INVALID_TABLE("Unknown signature",
 609                                       cpio_path, file.name);
 610                 if (file.size != table->length)
 611                         INVALID_TABLE("File length does not match table length",
 612                                       cpio_path, file.name);
 613                 if (acpi_table_checksum(file.data, table->length))
 614                         INVALID_TABLE("Bad table checksum",
 615                                       cpio_path, file.name);
 616
 617                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 618                         table->signature, cpio_path, file.name, table->length);
 619
 620                 all_tables_size += table->length;
 621                 early_initrd_files[table_nr].data = file.data;
 622                 early_initrd_files[table_nr].size = file.size;
 623                 table_nr++;
 624         }
 625         if (table_nr == 0)
 626                 return;
 627
 628         acpi_tables_addr =
 629                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 630                                        all_tables_size, PAGE_SIZE);
 631         if (!acpi_tables_addr) {
 632                 WARN_ON(1);
 633                 return;
 634         }
 635         /*
 636          * Only calling e820_add_reserve does not work and the
 637          * tables are invalid (memory got used) later.
 638          * memblock_reserve works as expected and the tables won't get modified.
 639          * But it's not enough on X86 because ioremap will
 640          * complain later (used by acpi_os_map_memory) that the pages
 641          * that should get mapped are not marked "reserved".
 642          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 643          * works fine.
 644          */
 645         memblock_reserve(acpi_tables_addr, acpi_tables_addr + all_tables_size);
 646         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 647
 648         p = early_ioremap(acpi_tables_addr, all_tables_size);
 649
 650         for (no = 0; no < table_nr; no++) {
 651                 memcpy(p + total_offset, early_initrd_files[no].data,
 652                        early_initrd_files[no].size);
 653                 total_offset += early_initrd_files[no].size;
 654         }
 655         early_iounmap(p, all_tables_size);
 656 }
 657 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 658
 659 static void acpi_table_taint(struct acpi_table_header *table)
 660 {
 661         pr_warn(PREFIX
 662                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 663                 table->signature, table->oem_table_id);
 664         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 665 }
 666
 667
 668 acpi_status
 669 acpi_os_table_override(struct acpi_table_header * existing_table,
 670                        struct acpi_table_header ** new_table)
 671 {
 672         if (!existing_table || !new_table)
 673                 return AE_BAD_PARAMETER;
 674
 675         *new_table = NULL;
 676
 677 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 678         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 679                 *new_table = (struct acpi_table_header *)AmlCode;
 680 #endif
 681         if (*new_table != NULL)
 682                 acpi_table_taint(existing_table);
 683         return AE_OK;
 684 }
 685
 686 acpi_status
 687 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 688                                 acpi_physical_address *address,
 689                                 u32 *table_length)
 690 {
 691 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 692         *table_length = 0;
 693         *address = 0;
 694         return AE_OK;
 695 #else
 696         int table_offset = 0;
 697         struct acpi_table_header *table;
 698
 699         *table_length = 0;
 700         *address = 0;
 701
 702         if (!acpi_tables_addr)
 703                 return AE_OK;
 704
 705         do {
 706                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 707                         WARN_ON(1);
 708                         return AE_OK;
 709                 }
 710
 711                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 712                                            ACPI_HEADER_SIZE);
 713
 714                 if (table_offset + table->length > all_tables_size) {
 715                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 716                         WARN_ON(1);
 717                         return AE_OK;
 718                 }
 719
 720                 table_offset += table->length;
 721
 722                 if (memcmp(existing_table->signature, table->signature, 4)) {
 723                         acpi_os_unmap_memory(table,
 724                                      ACPI_HEADER_SIZE);
 725                         continue;
 726                 }
 727
 728                 /* Only override tables with matching oem id */
 729                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 730                            ACPI_OEM_TABLE_ID_SIZE)) {
 731                         acpi_os_unmap_memory(table,
 732                                      ACPI_HEADER_SIZE);
 733                         continue;
 734                 }
 735
 736                 table_offset -= table->length;
 737                 *table_length = table->length;
 738                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 739                 *address = acpi_tables_addr + table_offset;
 740                 break;
 741         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 742
 743         if (*address != 0)
 744                 acpi_table_taint(existing_table);
 745         return AE_OK;
 746 #endif
 747 }
 748
 749 static irqreturn_t acpi_irq(int irq, void *dev_id)
 750 {
 751         u32 handled;
 752
 753         handled = (*acpi_irq_handler) (acpi_irq_context);
 754
 755         if (handled) {
 756                 acpi_irq_handled++;
 757                 return IRQ_HANDLED;
 758         } else {
 759                 acpi_irq_not_handled++;
 760                 return IRQ_NONE;
 761         }
 762 }
 763
 764 acpi_status
 765 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 766                                   void *context)
 767 {
 768         unsigned int irq;
 769
 770         acpi_irq_stats_init();
 771
 772         /*
 773          * ACPI interrupts different from the SCI in our copy of the FADT are
 774          * not supported.
 775          */
 776         if (gsi != acpi_gbl_FADT.sci_interrupt)
 777                 return AE_BAD_PARAMETER;
 778
 779         if (acpi_irq_handler)
 780                 return AE_ALREADY_ACQUIRED;
 781
 782         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 783                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 784                        gsi);
 785                 return AE_OK;
 786         }
 787
 788         acpi_irq_handler = handler;
 789         acpi_irq_context = context;
 790         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 791                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 792                 acpi_irq_handler = NULL;
 793                 return AE_NOT_ACQUIRED;
 794         }
 795
 796         return AE_OK;
 797 }
 798
 799 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 800 {
 801         if (irq != acpi_gbl_FADT.sci_interrupt)
 802                 return AE_BAD_PARAMETER;
 803
 804         free_irq(irq, acpi_irq);
 805         acpi_irq_handler = NULL;
 806
 807         return AE_OK;
 808 }
 809
 810 /*
 811  * Running in interpreter thread context, safe to sleep
 812  */
 813
 814 void acpi_os_sleep(u64 ms)
 815 {
 816         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 817 }
 818
 819 void acpi_os_stall(u32 us)
 820 {
 821         while (us) {
 822                 u32 delay = 1000;
 823
 824                 if (delay > us)
 825                         delay = us;
 826                 udelay(delay);
 827                 touch_nmi_watchdog();
 828                 us -= delay;
 829         }
 830 }
 831
 832 /*
 833  * Support ACPI 3.0 AML Timer operand
 834  * Returns 64-bit free-running, monotonically increasing timer
 835  * with 100ns granularity
 836  */
 837 u64 acpi_os_get_timer(void)
 838 {
 839         static u64 t;
 840
 841 #ifdef  CONFIG_HPET
 842         /* TBD: use HPET if available */
 843 #endif
 844
 845 #ifdef  CONFIG_X86_PM_TIMER
 846         /* TBD: default to PM timer if HPET was not available */
 847 #endif
 848         if (!t)
 849                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 850
 851         return ++t;
 852 }
 853
 854 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 855 {
 856         u32 dummy;
 857
 858         if (!value)
 859                 value = &dummy;
 860
 861         *value = 0;
 862         if (width <= 8) {
 863                 *(u8 *) value = inb(port);
 864         } else if (width <= 16) {
 865                 *(u16 *) value = inw(port);
 866         } else if (width <= 32) {
 867                 *(u32 *) value = inl(port);
 868         } else {
 869                 BUG();
 870         }
 871
 872         return AE_OK;
 873 }
 874
 875 EXPORT_SYMBOL(acpi_os_read_port);
 876
 877 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 878 {
 879         if (width <= 8) {
 880                 outb(value, port);
 881         } else if (width <= 16) {
 882                 outw(value, port);
 883         } else if (width <= 32) {
 884                 outl(value, port);
 885         } else {
 886                 BUG();
 887         }
 888
 889         return AE_OK;
 890 }
 891
 892 EXPORT_SYMBOL(acpi_os_write_port);
 893
 894 #ifdef readq
 895 static inline u64 read64(const volatile void __iomem *addr)
 896 {
 897         return readq(addr);
 898 }
 899 #else
 900 static inline u64 read64(const volatile void __iomem *addr)
 901 {
 902         u64 l, h;
 903         l = readl(addr);
 904         h = readl(addr+4);
 905         return l | (h << 32);
 906 }
 907 #endif
 908
 909 acpi_status
 910 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 911 {
 912         void __iomem *virt_addr;
 913         unsigned int size = width / 8;
 914         bool unmap = false;
 915         u64 dummy;
 916
 917         rcu_read_lock();
 918         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 919         if (!virt_addr) {
 920                 rcu_read_unlock();
 921                 virt_addr = acpi_os_ioremap(phys_addr, size);
 922                 if (!virt_addr)
 923                         return AE_BAD_ADDRESS;
 924                 unmap = true;
 925         }
 926
 927         if (!value)
 928                 value = &dummy;
 929
 930         switch (width) {
 931         case 8:
 932                 *(u8 *) value = readb(virt_addr);
 933                 break;
 934         case 16:
 935                 *(u16 *) value = readw(virt_addr);
 936                 break;
 937         case 32:
 938                 *(u32 *) value = readl(virt_addr);
 939                 break;
 940         case 64:
 941                 *(u64 *) value = read64(virt_addr);
 942                 break;
 943         default:
 944                 BUG();
 945         }
 946
 947         if (unmap)
 948                 iounmap(virt_addr);
 949         else
 950                 rcu_read_unlock();
 951
 952         return AE_OK;
 953 }
 954
 955 #ifdef writeq
 956 static inline void write64(u64 val, volatile void __iomem *addr)
 957 {
 958         writeq(val, addr);
 959 }
 960 #else
 961 static inline void write64(u64 val, volatile void __iomem *addr)
 962 {
 963         writel(val, addr);
 964         writel(val>>32, addr+4);
 965 }
 966 #endif
 967
 968 acpi_status
 969 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 970 {
 971         void __iomem *virt_addr;
 972         unsigned int size = width / 8;
 973         bool unmap = false;
 974
 975         rcu_read_lock();
 976         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 977         if (!virt_addr) {
 978                 rcu_read_unlock();
 979                 virt_addr = acpi_os_ioremap(phys_addr, size);
 980                 if (!virt_addr)
 981                         return AE_BAD_ADDRESS;
 982                 unmap = true;
 983         }
 984
 985         switch (width) {
 986         case 8:
 987                 writeb(value, virt_addr);
 988                 break;
 989         case 16:
 990                 writew(value, virt_addr);
 991                 break;
 992         case 32:
 993                 writel(value, virt_addr);
 994                 break;
 995         case 64:
 996                 write64(value, virt_addr);
 997                 break;
 998         default:
 999                 BUG();
1000         }
1001
1002         if (unmap)
1003                 iounmap(virt_addr);
1004         else
1005                 rcu_read_unlock();
1006
1007         return AE_OK;
1008 }
1009
1010 acpi_status
1011 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1012                                u64 *value, u32 width)
1013 {
1014         int result, size;
1015         u32 value32;
1016
1017         if (!value)
1018                 return AE_BAD_PARAMETER;
1019
1020         switch (width) {
1021         case 8:
1022                 size = 1;
1023                 break;
1024         case 16:
1025                 size = 2;
1026                 break;
1027         case 32:
1028                 size = 4;
1029                 break;
1030         default:
1031                 return AE_ERROR;
1032         }
1033
1034         result = raw_pci_read(pci_id->segment, pci_id->bus,
1035                                 PCI_DEVFN(pci_id->device, pci_id->function),
1036                                 reg, size, &value32);
1037         *value = value32;
1038
1039         return (result ? AE_ERROR : AE_OK);
1040 }
1041
1042 acpi_status
1043 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1044                                 u64 value, u32 width)
1045 {
1046         int result, size;
1047
1048         switch (width) {
1049         case 8:
1050                 size = 1;
1051                 break;
1052         case 16:
1053                 size = 2;
1054                 break;
1055         case 32:
1056                 size = 4;
1057                 break;
1058         default:
1059                 return AE_ERROR;
1060         }
1061
1062         result = raw_pci_write(pci_id->segment, pci_id->bus,
1063                                 PCI_DEVFN(pci_id->device, pci_id->function),
1064                                 reg, size, value);
1065
1066         return (result ? AE_ERROR : AE_OK);
1067 }
1068
1069 static void acpi_os_execute_deferred(struct work_struct *work)
1070 {
1071         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1072
1073         if (dpc->wait)
1074                 acpi_os_wait_events_complete();
1075
1076         dpc->function(dpc->context);
1077         kfree(dpc);
1078 }
1079
1080 /*******************************************************************************
1081  *
1082  * FUNCTION:    acpi_os_execute
1083  *
1084  * PARAMETERS:  Type               - Type of the callback
1085  *              Function           - Function to be executed
1086  *              Context            - Function parameters
1087  *
1088  * RETURN:      Status
1089  *
1090  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1091  *              immediately executes function on a separate thread.
1092  *
1093  ******************************************************************************/
1094
1095 static acpi_status __acpi_os_execute(acpi_execute_type type,
1096         acpi_osd_exec_callback function, void *context, int hp)
1097 {
1098         acpi_status status = AE_OK;
1099         struct acpi_os_dpc *dpc;
1100         struct workqueue_struct *queue;
1101         int ret;
1102         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1103                           "Scheduling function [%p(%p)] for deferred execution.\n",
1104                           function, context));
1105
1106         /*
1107          * Allocate/initialize DPC structure.  Note that this memory will be
1108          * freed by the callee.  The kernel handles the work_struct list  in a
1109          * way that allows us to also free its memory inside the callee.
1110          * Because we may want to schedule several tasks with different
1111          * parameters we can't use the approach some kernel code uses of
1112          * having a static work_struct.
1113          */
1114
1115         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1116         if (!dpc)
1117                 return AE_NO_MEMORY;
1118
1119         dpc->function = function;
1120         dpc->context = context;
1121
1122         /*
1123          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1124          * because the hotplug code may call driver .remove() functions,
1125          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1126          * to flush these workqueues.
1127          *
1128          * To prevent lockdep from complaining unnecessarily, make sure that
1129          * there is a different static lockdep key for each workqueue by using
1130          * INIT_WORK() for each of them separately.
1131          */
1132         if (hp) {
1133                 queue = kacpi_hotplug_wq;
1134                 dpc->wait = 1;
1135                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1136         } else if (type == OSL_NOTIFY_HANDLER) {
1137                 queue = kacpi_notify_wq;
1138                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1139         } else {
1140                 queue = kacpid_wq;
1141                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1142         }
1143
1144         /*
1145          * On some machines, a software-initiated SMI causes corruption unless
1146          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1147          * typically it's done in GPE-related methods that are run via
1148          * workqueues, so we can avoid the known corruption cases by always
1149          * queueing on CPU 0.
1150          */
1151         ret = queue_work_on(0, queue, &dpc->work);
1152
1153         if (!ret) {
1154                 printk(KERN_ERR PREFIX
1155                           "Call to queue_work() failed.\n");
1156                 status = AE_ERROR;
1157                 kfree(dpc);
1158         }
1159         return status;
1160 }
1161
1162 acpi_status acpi_os_execute(acpi_execute_type type,
1163                             acpi_osd_exec_callback function, void *context)
1164 {
1165         return __acpi_os_execute(type, function, context, 0);
1166 }
1167 EXPORT_SYMBOL(acpi_os_execute);
1168
1169 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1170         void *context)
1171 {
1172         return __acpi_os_execute(0, function, context, 1);
1173 }
1174 EXPORT_SYMBOL(acpi_os_hotplug_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 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1183
1184 acpi_status
1185 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1186 {
1187         struct semaphore *sem = NULL;
1188
1189         sem = acpi_os_allocate(sizeof(struct semaphore));
1190         if (!sem)
1191                 return AE_NO_MEMORY;
1192         memset(sem, 0, sizeof(struct semaphore));
1193
1194         sema_init(sem, initial_units);
1195
1196         *handle = (acpi_handle *) sem;
1197
1198         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1199                           *handle, initial_units));
1200
1201         return AE_OK;
1202 }
1203
1204 /*
1205  * TODO: A better way to delete semaphores?  Linux doesn't have a
1206  * 'delete_semaphore()' function -- may result in an invalid
1207  * pointer dereference for non-synchronized consumers.  Should
1208  * we at least check for blocked threads and signal/cancel them?
1209  */
1210
1211 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1212 {
1213         struct semaphore *sem = (struct semaphore *)handle;
1214
1215         if (!sem)
1216                 return AE_BAD_PARAMETER;
1217
1218         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1219
1220         BUG_ON(!list_empty(&sem->wait_list));
1221         kfree(sem);
1222         sem = NULL;
1223
1224         return AE_OK;
1225 }
1226
1227 /*
1228  * TODO: Support for units > 1?
1229  */
1230 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1231 {
1232         acpi_status status = AE_OK;
1233         struct semaphore *sem = (struct semaphore *)handle;
1234         long jiffies;
1235         int ret = 0;
1236
1237         if (!sem || (units < 1))
1238                 return AE_BAD_PARAMETER;
1239
1240         if (units > 1)
1241                 return AE_SUPPORT;
1242
1243         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1244                           handle, units, timeout));
1245
1246         if (timeout == ACPI_WAIT_FOREVER)
1247                 jiffies = MAX_SCHEDULE_TIMEOUT;
1248         else
1249                 jiffies = msecs_to_jiffies(timeout);
1250
1251         ret = down_timeout(sem, jiffies);
1252         if (ret)
1253                 status = AE_TIME;
1254
1255         if (ACPI_FAILURE(status)) {
1256                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1257                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1258                                   handle, units, timeout,
1259                                   acpi_format_exception(status)));
1260         } else {
1261                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1262                                   "Acquired semaphore[%p|%d|%d]", handle,
1263                                   units, timeout));
1264         }
1265
1266         return status;
1267 }
1268
1269 /*
1270  * TODO: Support for units > 1?
1271  */
1272 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1273 {
1274         struct semaphore *sem = (struct semaphore *)handle;
1275
1276         if (!sem || (units < 1))
1277                 return AE_BAD_PARAMETER;
1278
1279         if (units > 1)
1280                 return AE_SUPPORT;
1281
1282         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1283                           units));
1284
1285         up(sem);
1286
1287         return AE_OK;
1288 }
1289
1290 #ifdef ACPI_FUTURE_USAGE
1291 u32 acpi_os_get_line(char *buffer)
1292 {
1293
1294 #ifdef ENABLE_DEBUGGER
1295         if (acpi_in_debugger) {
1296                 u32 chars;
1297
1298                 kdb_read(buffer, sizeof(line_buf));
1299
1300                 /* remove the CR kdb includes */
1301                 chars = strlen(buffer) - 1;
1302                 buffer[chars] = '\0';
1303         }
1304 #endif
1305
1306         return 0;
1307 }
1308 #endif                          /*  ACPI_FUTURE_USAGE  */
1309
1310 acpi_status acpi_os_signal(u32 function, void *info)
1311 {
1312         switch (function) {
1313         case ACPI_SIGNAL_FATAL:
1314                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1315                 break;
1316         case ACPI_SIGNAL_BREAKPOINT:
1317                 /*
1318                  * AML Breakpoint
1319                  * ACPI spec. says to treat it as a NOP unless
1320                  * you are debugging.  So if/when we integrate
1321                  * AML debugger into the kernel debugger its
1322                  * hook will go here.  But until then it is
1323                  * not useful to print anything on breakpoints.
1324                  */
1325                 break;
1326         default:
1327                 break;
1328         }
1329
1330         return AE_OK;
1331 }
1332
1333 static int __init acpi_os_name_setup(char *str)
1334 {
1335         char *p = acpi_os_name;
1336         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1337
1338         if (!str || !*str)
1339                 return 0;
1340
1341         for (; count-- && str && *str; str++) {
1342                 if (isalnum(*str) || *str == ' ' || *str == ':')
1343                         *p++ = *str;
1344                 else if (*str == '\'' || *str == '"')
1345                         continue;
1346                 else
1347                         break;
1348         }
1349         *p = 0;
1350
1351         return 1;
1352
1353 }
1354
1355 __setup("acpi_os_name=", acpi_os_name_setup);
1356
1357 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1358 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1359
1360 struct osi_setup_entry {
1361         char string[OSI_STRING_LENGTH_MAX];
1362         bool enable;
1363 };
1364
1365 static struct osi_setup_entry __initdata
1366                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1367         {"Module Device", true},
1368         {"Processor Device", true},
1369         {"3.0 _SCP Extensions", true},
1370         {"Processor Aggregator Device", true},
1371 };
1372
1373 void __init acpi_osi_setup(char *str)
1374 {
1375         struct osi_setup_entry *osi;
1376         bool enable = true;
1377         int i;
1378
1379         if (!acpi_gbl_create_osi_method)
1380                 return;
1381
1382         if (str == NULL || *str == '\0') {
1383                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1384                 acpi_gbl_create_osi_method = FALSE;
1385                 return;
1386         }
1387
1388         if (*str == '!') {
1389                 str++;
1390                 enable = false;
1391         }
1392
1393         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1394                 osi = &osi_setup_entries[i];
1395                 if (!strcmp(osi->string, str)) {
1396                         osi->enable = enable;
1397                         break;
1398                 } else if (osi->string[0] == '\0') {
1399                         osi->enable = enable;
1400                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1401                         break;
1402                 }
1403         }
1404 }
1405
1406 static void __init set_osi_linux(unsigned int enable)
1407 {
1408         if (osi_linux.enable != enable)
1409                 osi_linux.enable = enable;
1410
1411         if (osi_linux.enable)
1412                 acpi_osi_setup("Linux");
1413         else
1414                 acpi_osi_setup("!Linux");
1415
1416         return;
1417 }
1418
1419 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1420 {
1421         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1422         osi_linux.dmi = 0;
1423         set_osi_linux(enable);
1424
1425         return;
1426 }
1427
1428 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1429 {
1430         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1431
1432         if (enable == -1)
1433                 return;
1434
1435         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1436         set_osi_linux(enable);
1437
1438         return;
1439 }
1440
1441 /*
1442  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1443  *
1444  * empty string disables _OSI
1445  * string starting with '!' disables that string
1446  * otherwise string is added to list, augmenting built-in strings
1447  */
1448 static void __init acpi_osi_setup_late(void)
1449 {
1450         struct osi_setup_entry *osi;
1451         char *str;
1452         int i;
1453         acpi_status status;
1454
1455         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1456                 osi = &osi_setup_entries[i];
1457                 str = osi->string;
1458
1459                 if (*str == '\0')
1460                         break;
1461                 if (osi->enable) {
1462                         status = acpi_install_interface(str);
1463
1464                         if (ACPI_SUCCESS(status))
1465                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1466                 } else {
1467                         status = acpi_remove_interface(str);
1468
1469                         if (ACPI_SUCCESS(status))
1470                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1471                 }
1472         }
1473 }
1474
1475 static int __init osi_setup(char *str)
1476 {
1477         if (str && !strcmp("Linux", str))
1478                 acpi_cmdline_osi_linux(1);
1479         else if (str && !strcmp("!Linux", str))
1480                 acpi_cmdline_osi_linux(0);
1481         else
1482                 acpi_osi_setup(str);
1483
1484         return 1;
1485 }
1486
1487 __setup("acpi_osi=", osi_setup);
1488
1489 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1490 static int __init acpi_serialize_setup(char *str)
1491 {
1492         printk(KERN_INFO PREFIX "serialize enabled\n");
1493
1494         acpi_gbl_all_methods_serialized = TRUE;
1495
1496         return 1;
1497 }
1498
1499 __setup("acpi_serialize", acpi_serialize_setup);
1500
1501 /* Check of resource interference between native drivers and ACPI
1502  * OperationRegions (SystemIO and System Memory only).
1503  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1504  * in arbitrary AML code and can interfere with legacy drivers.
1505  * acpi_enforce_resources= can be set to:
1506  *
1507  *   - strict (default) (2)
1508  *     -> further driver trying to access the resources will not load
1509  *   - lax              (1)
1510  *     -> further driver trying to access the resources will load, but you
1511  *     get a system message that something might go wrong...
1512  *
1513  *   - no               (0)
1514  *     -> ACPI Operation Region resources will not be registered
1515  *
1516  */
1517 #define ENFORCE_RESOURCES_STRICT 2
1518 #define ENFORCE_RESOURCES_LAX    1
1519 #define ENFORCE_RESOURCES_NO     0
1520
1521 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1522
1523 static int __init acpi_enforce_resources_setup(char *str)
1524 {
1525         if (str == NULL || *str == '\0')
1526                 return 0;
1527
1528         if (!strcmp("strict", str))
1529                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1530         else if (!strcmp("lax", str))
1531                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1532         else if (!strcmp("no", str))
1533                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1534
1535         return 1;
1536 }
1537
1538 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1539
1540 /* Check for resource conflicts between ACPI OperationRegions and native
1541  * drivers */
1542 int acpi_check_resource_conflict(const struct resource *res)
1543 {
1544         acpi_adr_space_type space_id;
1545         acpi_size length;
1546         u8 warn = 0;
1547         int clash = 0;
1548
1549         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1550                 return 0;
1551         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1552                 return 0;
1553
1554         if (res->flags & IORESOURCE_IO)
1555                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1556         else
1557                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1558
1559         length = res->end - res->start + 1;
1560         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1561                 warn = 1;
1562         clash = acpi_check_address_range(space_id, res->start, length, warn);
1563
1564         if (clash) {
1565                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1566                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1567                                 printk(KERN_NOTICE "ACPI: This conflict may"
1568                                        " cause random problems and system"
1569                                        " instability\n");
1570                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1571                                " for this device, you should use it instead of"
1572                                " the native driver\n");
1573                 }
1574                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1575                         return -EBUSY;
1576         }
1577         return 0;
1578 }
1579 EXPORT_SYMBOL(acpi_check_resource_conflict);
1580
1581 int acpi_check_region(resource_size_t start, resource_size_t n,
1582                       const char *name)
1583 {
1584         struct resource res = {
1585                 .start = start,
1586                 .end   = start + n - 1,
1587                 .name  = name,
1588                 .flags = IORESOURCE_IO,
1589         };
1590
1591         return acpi_check_resource_conflict(&res);
1592 }
1593 EXPORT_SYMBOL(acpi_check_region);
1594
1595 /*
1596  * Let drivers know whether the resource checks are effective
1597  */
1598 int acpi_resources_are_enforced(void)
1599 {
1600         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1601 }
1602 EXPORT_SYMBOL(acpi_resources_are_enforced);
1603
1604 /*
1605  * Deallocate the memory for a spinlock.
1606  */
1607 void acpi_os_delete_lock(acpi_spinlock handle)
1608 {
1609         ACPI_FREE(handle);
1610 }
1611
1612 /*
1613  * Acquire a spinlock.
1614  *
1615  * handle is a pointer to the spinlock_t.
1616  */
1617
1618 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1619 {
1620         acpi_cpu_flags flags;
1621         spin_lock_irqsave(lockp, flags);
1622         return flags;
1623 }
1624
1625 /*
1626  * Release a spinlock. See above.
1627  */
1628
1629 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1630 {
1631         spin_unlock_irqrestore(lockp, flags);
1632 }
1633
1634 #ifndef ACPI_USE_LOCAL_CACHE
1635
1636 /*******************************************************************************
1637  *
1638  * FUNCTION:    acpi_os_create_cache
1639  *
1640  * PARAMETERS:  name      - Ascii name for the cache
1641  *              size      - Size of each cached object
1642  *              depth     - Maximum depth of the cache (in objects) <ignored>
1643  *              cache     - Where the new cache object is returned
1644  *
1645  * RETURN:      status
1646  *
1647  * DESCRIPTION: Create a cache object
1648  *
1649  ******************************************************************************/
1650
1651 acpi_status
1652 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1653 {
1654         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1655         if (*cache == NULL)
1656                 return AE_ERROR;
1657         else
1658                 return AE_OK;
1659 }
1660
1661 /*******************************************************************************
1662  *
1663  * FUNCTION:    acpi_os_purge_cache
1664  *
1665  * PARAMETERS:  Cache           - Handle to cache object
1666  *
1667  * RETURN:      Status
1668  *
1669  * DESCRIPTION: Free all objects within the requested cache.
1670  *
1671  ******************************************************************************/
1672
1673 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1674 {
1675         kmem_cache_shrink(cache);
1676         return (AE_OK);
1677 }
1678
1679 /*******************************************************************************
1680  *
1681  * FUNCTION:    acpi_os_delete_cache
1682  *
1683  * PARAMETERS:  Cache           - Handle to cache object
1684  *
1685  * RETURN:      Status
1686  *
1687  * DESCRIPTION: Free all objects within the requested cache and delete the
1688  *              cache object.
1689  *
1690  ******************************************************************************/
1691
1692 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1693 {
1694         kmem_cache_destroy(cache);
1695         return (AE_OK);
1696 }
1697
1698 /*******************************************************************************
1699  *
1700  * FUNCTION:    acpi_os_release_object
1701  *
1702  * PARAMETERS:  Cache       - Handle to cache object
1703  *              Object      - The object to be released
1704  *
1705  * RETURN:      None
1706  *
1707  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1708  *              the object is deleted.
1709  *
1710  ******************************************************************************/
1711
1712 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1713 {
1714         kmem_cache_free(cache, object);
1715         return (AE_OK);
1716 }
1717 #endif
1718
1719 acpi_status __init acpi_os_initialize(void)
1720 {
1721         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1722         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1723         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1724         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1725
1726         return AE_OK;
1727 }
1728
1729 acpi_status __init acpi_os_initialize1(void)
1730 {
1731         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1732         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1733         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1734         BUG_ON(!kacpid_wq);
1735         BUG_ON(!kacpi_notify_wq);
1736         BUG_ON(!kacpi_hotplug_wq);
1737         acpi_install_interface_handler(acpi_osi_handler);
1738         acpi_osi_setup_late();
1739         return AE_OK;
1740 }
1741
1742 acpi_status acpi_os_terminate(void)
1743 {
1744         if (acpi_irq_handler) {
1745                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1746                                                  acpi_irq_handler);
1747         }
1748
1749         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1750         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1751         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1752         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1753
1754         destroy_workqueue(kacpid_wq);
1755         destroy_workqueue(kacpi_notify_wq);
1756         destroy_workqueue(kacpi_hotplug_wq);
1757
1758         return AE_OK;
1759 }
1760
1761 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1762                                   u32 pm1b_control)
1763 {
1764         int rc = 0;
1765         if (__acpi_os_prepare_sleep)
1766                 rc = __acpi_os_prepare_sleep(sleep_state,
1767                                              pm1a_control, pm1b_control);
1768         if (rc < 0)
1769                 return AE_ERROR;
1770         else if (rc > 0)
1771                 return AE_CTRL_SKIP;
1772
1773         return AE_OK;
1774 }
1775
1776 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1777                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1778 {
1779         __acpi_os_prepare_sleep = func;
1780 }