drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <willy@linux.intel.com>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/highmem.h>
  35 #include <linux/pci.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/kmod.h>
  38 #include <linux/delay.h>
  39 #include <linux/workqueue.h>
  40 #include <linux/nmi.h>
  41 #include <linux/acpi.h>
  42 #include <linux/efi.h>
  43 #include <linux/ioport.h>
  44 #include <linux/list.h>
  45 #include <linux/jiffies.h>
  46 #include <linux/semaphore.h>
  47
  48 #include <asm/io.h>
  49 #include <asm/uaccess.h>
  50
  51 #include "internal.h"
  52
  53 #define _COMPONENT              ACPI_OS_SERVICES
  54 ACPI_MODULE_NAME("osl");
  55
  56 struct acpi_os_dpc {
  57         acpi_osd_exec_callback function;
  58         void *context;
  59         struct work_struct work;
  60 };
  61
  62 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  63 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  64 #endif
  65
  66 #ifdef ENABLE_DEBUGGER
  67 #include <linux/kdb.h>
  68
  69 /* stuff for debugger support */
  70 int acpi_in_debugger;
  71 EXPORT_SYMBOL(acpi_in_debugger);
  72
  73 extern char line_buf[80];
  74 #endif                          /*ENABLE_DEBUGGER */
  75
  76 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
  77                                       u32 pm1b_ctrl);
  78 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
  79                                       u32 val_b);
  80
  81 static acpi_osd_handler acpi_irq_handler;
  82 static void *acpi_irq_context;
  83 static struct workqueue_struct *kacpid_wq;
  84 static struct workqueue_struct *kacpi_notify_wq;
  85 static struct workqueue_struct *kacpi_hotplug_wq;
  86
  87 /*
  88  * This list of permanent mappings is for memory that may be accessed from
  89  * interrupt context, where we can't do the ioremap().
  90  */
  91 struct acpi_ioremap {
  92         struct list_head list;
  93         void __iomem *virt;
  94         acpi_physical_address phys;
  95         acpi_size size;
  96         unsigned long refcount;
  97 };
  98
  99 static LIST_HEAD(acpi_ioremaps);
 100 static DEFINE_MUTEX(acpi_ioremap_lock);
 101
 102 static void __init acpi_osi_setup_late(void);
 103
 104 /*
 105  * The story of _OSI(Linux)
 106  *
 107  * From pre-history through Linux-2.6.22,
 108  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 109  *
 110  * Unfortunately, reference BIOS writers got wind of this
 111  * and put OSI(Linux) in their example code, quickly exposing
 112  * this string as ill-conceived and opening the door to
 113  * an un-bounded number of BIOS incompatibilities.
 114  *
 115  * For example, OSI(Linux) was used on resume to re-POST a
 116  * video card on one system, because Linux at that time
 117  * could not do a speedy restore in its native driver.
 118  * But then upon gaining quick native restore capability,
 119  * Linux has no way to tell the BIOS to skip the time-consuming
 120  * POST -- putting Linux at a permanent performance disadvantage.
 121  * On another system, the BIOS writer used OSI(Linux)
 122  * to infer native OS support for IPMI!  On other systems,
 123  * OSI(Linux) simply got in the way of Linux claiming to
 124  * be compatible with other operating systems, exposing
 125  * BIOS issues such as skipped device initialization.
 126  *
 127  * So "Linux" turned out to be a really poor chose of
 128  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 129  *
 130  * BIOS writers should NOT query _OSI(Linux) on future systems.
 131  * Linux will complain on the console when it sees it, and return FALSE.
 132  * To get Linux to return TRUE for your system  will require
 133  * a kernel source update to add a DMI entry,
 134  * or boot with "acpi_osi=Linux"
 135  */
 136
 137 static struct osi_linux {
 138         unsigned int    enable:1;
 139         unsigned int    dmi:1;
 140         unsigned int    cmdline:1;
 141         unsigned int    default_disabling:1;
 142 } osi_linux = {0, 0, 0, 0};
 143
 144 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
 145 {
 146         if (!strcmp("Linux", interface)) {
 147
 148                 printk_once(KERN_NOTICE FW_BUG PREFIX
 149                         "BIOS _OSI(Linux) query %s%s\n",
 150                         osi_linux.enable ? "honored" : "ignored",
 151                         osi_linux.cmdline ? " via cmdline" :
 152                         osi_linux.dmi ? " via DMI" : "");
 153         }
 154
 155         return supported;
 156 }
 157
 158 static void __init acpi_request_region (struct acpi_generic_address *gas,
 159         unsigned int length, char *desc)
 160 {
 161         u64 addr;
 162
 163         /* Handle possible alignment issues */
 164         memcpy(&addr, &gas->address, sizeof(addr));
 165         if (!addr || !length)
 166                 return;
 167
 168         /* Resources are never freed */
 169         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 170                 request_region(addr, length, desc);
 171         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 172                 request_mem_region(addr, length, desc);
 173 }
 174
 175 static int __init acpi_reserve_resources(void)
 176 {
 177         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 178                 "ACPI PM1a_EVT_BLK");
 179
 180         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 181                 "ACPI PM1b_EVT_BLK");
 182
 183         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 184                 "ACPI PM1a_CNT_BLK");
 185
 186         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 187                 "ACPI PM1b_CNT_BLK");
 188
 189         if (acpi_gbl_FADT.pm_timer_length == 4)
 190                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 191
 192         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 193                 "ACPI PM2_CNT_BLK");
 194
 195         /* Length of GPE blocks must be a non-negative multiple of 2 */
 196
 197         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 198                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 199                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 200
 201         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 202                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 203                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 204
 205         return 0;
 206 }
 207 device_initcall(acpi_reserve_resources);
 208
 209 void acpi_os_printf(const char *fmt, ...)
 210 {
 211         va_list args;
 212         va_start(args, fmt);
 213         acpi_os_vprintf(fmt, args);
 214         va_end(args);
 215 }
 216
 217 void acpi_os_vprintf(const char *fmt, va_list args)
 218 {
 219         static char buffer[512];
 220
 221         vsprintf(buffer, fmt, args);
 222
 223 #ifdef ENABLE_DEBUGGER
 224         if (acpi_in_debugger) {
 225                 kdb_printf("%s", buffer);
 226         } else {
 227                 printk(KERN_CONT "%s", buffer);
 228         }
 229 #else
 230         printk(KERN_CONT "%s", buffer);
 231 #endif
 232 }
 233
 234 #ifdef CONFIG_KEXEC
 235 static unsigned long acpi_rsdp;
 236 static int __init setup_acpi_rsdp(char *arg)
 237 {
 238         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_memory(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_memory);
 409
 410 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
 411 {
 412         if (!--map->refcount)
 413                 list_del_rcu(&map->list);
 414 }
 415
 416 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
 417 {
 418         if (!map->refcount) {
 419                 synchronize_rcu();
 420                 acpi_unmap(map->phys, map->virt);
 421                 kfree(map);
 422         }
 423 }
 424
 425 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 426 {
 427         struct acpi_ioremap *map;
 428
 429         if (!acpi_gbl_permanent_mmap) {
 430                 __acpi_unmap_table(virt, size);
 431                 return;
 432         }
 433
 434         mutex_lock(&acpi_ioremap_lock);
 435         map = acpi_map_lookup_virt(virt, size);
 436         if (!map) {
 437                 mutex_unlock(&acpi_ioremap_lock);
 438                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
 439                 return;
 440         }
 441         acpi_os_drop_map_ref(map);
 442         mutex_unlock(&acpi_ioremap_lock);
 443
 444         acpi_os_map_cleanup(map);
 445 }
 446 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 447
 448 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 449 {
 450         if (!acpi_gbl_permanent_mmap)
 451                 __acpi_unmap_table(virt, size);
 452 }
 453
 454 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
 455 {
 456         u64 addr;
 457         void __iomem *virt;
 458
 459         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 460                 return 0;
 461
 462         /* Handle possible alignment issues */
 463         memcpy(&addr, &gas->address, sizeof(addr));
 464         if (!addr || !gas->bit_width)
 465                 return -EINVAL;
 466
 467         virt = acpi_os_map_memory(addr, gas->bit_width / 8);
 468         if (!virt)
 469                 return -EIO;
 470
 471         return 0;
 472 }
 473 EXPORT_SYMBOL(acpi_os_map_generic_address);
 474
 475 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 476 {
 477         u64 addr;
 478         struct acpi_ioremap *map;
 479
 480         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 481                 return;
 482
 483         /* Handle possible alignment issues */
 484         memcpy(&addr, &gas->address, sizeof(addr));
 485         if (!addr || !gas->bit_width)
 486                 return;
 487
 488         mutex_lock(&acpi_ioremap_lock);
 489         map = acpi_map_lookup(addr, gas->bit_width / 8);
 490         if (!map) {
 491                 mutex_unlock(&acpi_ioremap_lock);
 492                 return;
 493         }
 494         acpi_os_drop_map_ref(map);
 495         mutex_unlock(&acpi_ioremap_lock);
 496
 497         acpi_os_map_cleanup(map);
 498 }
 499 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 500
 501 #ifdef ACPI_FUTURE_USAGE
 502 acpi_status
 503 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 504 {
 505         if (!phys || !virt)
 506                 return AE_BAD_PARAMETER;
 507
 508         *phys = virt_to_phys(virt);
 509
 510         return AE_OK;
 511 }
 512 #endif
 513
 514 #define ACPI_MAX_OVERRIDE_LEN 100
 515
 516 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 517
 518 acpi_status
 519 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 520                             acpi_string * new_val)
 521 {
 522         if (!init_val || !new_val)
 523                 return AE_BAD_PARAMETER;
 524
 525         *new_val = NULL;
 526         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 527                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 528                        acpi_os_name);
 529                 *new_val = acpi_os_name;
 530         }
 531
 532         return AE_OK;
 533 }
 534
 535 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 536 #include <linux/earlycpio.h>
 537 #include <linux/memblock.h>
 538
 539 static u64 acpi_tables_addr;
 540 static int all_tables_size;
 541
 542 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 543 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 544 {
 545         u8 sum = 0;
 546         u8 *end = buffer + length;
 547
 548         while (buffer < end)
 549                 sum = (u8) (sum + *(buffer++));
 550         return sum;
 551 }
 552
 553 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 554 static const char * const table_sigs[] = {
 555         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 556         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 557         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 558         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 559         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 560         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 561         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 562         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 563         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 564
 565 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 566
 567 #define ACPI_OVERRIDE_TABLES 64
 568 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
 569
 570 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 571
 572 void __init acpi_initrd_override(void *data, size_t size)
 573 {
 574         int sig, no, table_nr = 0, total_offset = 0;
 575         long offset = 0;
 576         struct acpi_table_header *table;
 577         char cpio_path[32] = "kernel/firmware/acpi/";
 578         struct cpio_data file;
 579
 580         if (data == NULL || size == 0)
 581                 return;
 582
 583         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
 584                 file = find_cpio_data(cpio_path, data, size, &offset);
 585                 if (!file.data)
 586                         break;
 587
 588                 data += offset;
 589                 size -= offset;
 590
 591                 if (file.size < sizeof(struct acpi_table_header)) {
 592                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 593                                 cpio_path, file.name);
 594                         continue;
 595                 }
 596
 597                 table = file.data;
 598
 599                 for (sig = 0; table_sigs[sig]; sig++)
 600                         if (!memcmp(table->signature, table_sigs[sig], 4))
 601                                 break;
 602
 603                 if (!table_sigs[sig]) {
 604                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 605                                 cpio_path, file.name);
 606                         continue;
 607                 }
 608                 if (file.size != table->length) {
 609                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 610                                 cpio_path, file.name);
 611                         continue;
 612                 }
 613                 if (acpi_table_checksum(file.data, table->length)) {
 614                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 615                                 cpio_path, file.name);
 616                         continue;
 617                 }
 618
 619                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 620                         table->signature, cpio_path, file.name, table->length);
 621
 622                 all_tables_size += table->length;
 623                 acpi_initrd_files[table_nr].data = file.data;
 624                 acpi_initrd_files[table_nr].size = file.size;
 625                 table_nr++;
 626         }
 627         if (table_nr == 0)
 628                 return;
 629
 630         acpi_tables_addr =
 631                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 632                                        all_tables_size, PAGE_SIZE);
 633         if (!acpi_tables_addr) {
 634                 WARN_ON(1);
 635                 return;
 636         }
 637         /*
 638          * Only calling e820_add_reserve does not work and the
 639          * tables are invalid (memory got used) later.
 640          * memblock_reserve works as expected and the tables won't get modified.
 641          * But it's not enough on X86 because ioremap will
 642          * complain later (used by acpi_os_map_memory) that the pages
 643          * that should get mapped are not marked "reserved".
 644          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 645          * works fine.
 646          */
 647         memblock_reserve(acpi_tables_addr, all_tables_size);
 648         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 649
 650         /*
 651          * early_ioremap only can remap 256k one time. If we map all
 652          * tables one time, we will hit the limit. Need to map chunks
 653          * one by one during copying the same as that in relocate_initrd().
 654          */
 655         for (no = 0; no < table_nr; no++) {
 656                 unsigned char *src_p = acpi_initrd_files[no].data;
 657                 phys_addr_t size = acpi_initrd_files[no].size;
 658                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 659                 phys_addr_t slop, clen;
 660                 char *dest_p;
 661
 662                 total_offset += size;
 663
 664                 while (size) {
 665                         slop = dest_addr & ~PAGE_MASK;
 666                         clen = size;
 667                         if (clen > MAP_CHUNK_SIZE - slop)
 668                                 clen = MAP_CHUNK_SIZE - slop;
 669                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
 670                                                  clen + slop);
 671                         memcpy(dest_p + slop, src_p, clen);
 672                         early_iounmap(dest_p, clen + slop);
 673                         src_p += clen;
 674                         dest_addr += clen;
 675                         size -= clen;
 676                 }
 677         }
 678 }
 679 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
 680
 681 static void acpi_table_taint(struct acpi_table_header *table)
 682 {
 683         pr_warn(PREFIX
 684                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 685                 table->signature, table->oem_table_id);
 686         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 687 }
 688
 689
 690 acpi_status
 691 acpi_os_table_override(struct acpi_table_header * existing_table,
 692                        struct acpi_table_header ** new_table)
 693 {
 694         if (!existing_table || !new_table)
 695                 return AE_BAD_PARAMETER;
 696
 697         *new_table = NULL;
 698
 699 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 700         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 701                 *new_table = (struct acpi_table_header *)AmlCode;
 702 #endif
 703         if (*new_table != NULL)
 704                 acpi_table_taint(existing_table);
 705         return AE_OK;
 706 }
 707
 708 acpi_status
 709 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 710                                 acpi_physical_address *address,
 711                                 u32 *table_length)
 712 {
 713 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
 714         *table_length = 0;
 715         *address = 0;
 716         return AE_OK;
 717 #else
 718         int table_offset = 0;
 719         struct acpi_table_header *table;
 720
 721         *table_length = 0;
 722         *address = 0;
 723
 724         if (!acpi_tables_addr)
 725                 return AE_OK;
 726
 727         do {
 728                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
 729                         WARN_ON(1);
 730                         return AE_OK;
 731                 }
 732
 733                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 734                                            ACPI_HEADER_SIZE);
 735
 736                 if (table_offset + table->length > all_tables_size) {
 737                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 738                         WARN_ON(1);
 739                         return AE_OK;
 740                 }
 741
 742                 table_offset += table->length;
 743
 744                 if (memcmp(existing_table->signature, table->signature, 4)) {
 745                         acpi_os_unmap_memory(table,
 746                                      ACPI_HEADER_SIZE);
 747                         continue;
 748                 }
 749
 750                 /* Only override tables with matching oem id */
 751                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
 752                            ACPI_OEM_TABLE_ID_SIZE)) {
 753                         acpi_os_unmap_memory(table,
 754                                      ACPI_HEADER_SIZE);
 755                         continue;
 756                 }
 757
 758                 table_offset -= table->length;
 759                 *table_length = table->length;
 760                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 761                 *address = acpi_tables_addr + table_offset;
 762                 break;
 763         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
 764
 765         if (*address != 0)
 766                 acpi_table_taint(existing_table);
 767         return AE_OK;
 768 #endif
 769 }
 770
 771 static irqreturn_t acpi_irq(int irq, void *dev_id)
 772 {
 773         u32 handled;
 774
 775         handled = (*acpi_irq_handler) (acpi_irq_context);
 776
 777         if (handled) {
 778                 acpi_irq_handled++;
 779                 return IRQ_HANDLED;
 780         } else {
 781                 acpi_irq_not_handled++;
 782                 return IRQ_NONE;
 783         }
 784 }
 785
 786 acpi_status
 787 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 788                                   void *context)
 789 {
 790         unsigned int irq;
 791
 792         acpi_irq_stats_init();
 793
 794         /*
 795          * ACPI interrupts different from the SCI in our copy of the FADT are
 796          * not supported.
 797          */
 798         if (gsi != acpi_gbl_FADT.sci_interrupt)
 799                 return AE_BAD_PARAMETER;
 800
 801         if (acpi_irq_handler)
 802                 return AE_ALREADY_ACQUIRED;
 803
 804         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 805                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 806                        gsi);
 807                 return AE_OK;
 808         }
 809
 810         acpi_irq_handler = handler;
 811         acpi_irq_context = context;
 812         if (request_irq(irq, acpi_irq, IRQF_SHARED | IRQF_NO_SUSPEND, "acpi", acpi_irq)) {
 813                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 814                 acpi_irq_handler = NULL;
 815                 return AE_NOT_ACQUIRED;
 816         }
 817
 818         return AE_OK;
 819 }
 820
 821 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 822 {
 823         if (irq != acpi_gbl_FADT.sci_interrupt)
 824                 return AE_BAD_PARAMETER;
 825
 826         free_irq(irq, acpi_irq);
 827         acpi_irq_handler = NULL;
 828
 829         return AE_OK;
 830 }
 831
 832 /*
 833  * Running in interpreter thread context, safe to sleep
 834  */
 835
 836 void acpi_os_sleep(u64 ms)
 837 {
 838         msleep(ms);
 839 }
 840
 841 void acpi_os_stall(u32 us)
 842 {
 843         while (us) {
 844                 u32 delay = 1000;
 845
 846                 if (delay > us)
 847                         delay = us;
 848                 udelay(delay);
 849                 touch_nmi_watchdog();
 850                 us -= delay;
 851         }
 852 }
 853
 854 /*
 855  * Support ACPI 3.0 AML Timer operand
 856  * Returns 64-bit free-running, monotonically increasing timer
 857  * with 100ns granularity
 858  */
 859 u64 acpi_os_get_timer(void)
 860 {
 861         u64 time_ns = ktime_to_ns(ktime_get());
 862         do_div(time_ns, 100);
 863         return time_ns;
 864 }
 865
 866 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 867 {
 868         u32 dummy;
 869
 870         if (!value)
 871                 value = &dummy;
 872
 873         *value = 0;
 874         if (width <= 8) {
 875                 *(u8 *) value = inb(port);
 876         } else if (width <= 16) {
 877                 *(u16 *) value = inw(port);
 878         } else if (width <= 32) {
 879                 *(u32 *) value = inl(port);
 880         } else {
 881                 BUG();
 882         }
 883
 884         return AE_OK;
 885 }
 886
 887 EXPORT_SYMBOL(acpi_os_read_port);
 888
 889 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 890 {
 891         if (width <= 8) {
 892                 outb(value, port);
 893         } else if (width <= 16) {
 894                 outw(value, port);
 895         } else if (width <= 32) {
 896                 outl(value, port);
 897         } else {
 898                 BUG();
 899         }
 900
 901         return AE_OK;
 902 }
 903
 904 EXPORT_SYMBOL(acpi_os_write_port);
 905
 906 #ifdef readq
 907 static inline u64 read64(const volatile void __iomem *addr)
 908 {
 909         return readq(addr);
 910 }
 911 #else
 912 static inline u64 read64(const volatile void __iomem *addr)
 913 {
 914         u64 l, h;
 915         l = readl(addr);
 916         h = readl(addr+4);
 917         return l | (h << 32);
 918 }
 919 #endif
 920
 921 acpi_status
 922 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
 923 {
 924         void __iomem *virt_addr;
 925         unsigned int size = width / 8;
 926         bool unmap = false;
 927         u64 dummy;
 928
 929         rcu_read_lock();
 930         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 931         if (!virt_addr) {
 932                 rcu_read_unlock();
 933                 virt_addr = acpi_os_ioremap(phys_addr, size);
 934                 if (!virt_addr)
 935                         return AE_BAD_ADDRESS;
 936                 unmap = true;
 937         }
 938
 939         if (!value)
 940                 value = &dummy;
 941
 942         switch (width) {
 943         case 8:
 944                 *(u8 *) value = readb(virt_addr);
 945                 break;
 946         case 16:
 947                 *(u16 *) value = readw(virt_addr);
 948                 break;
 949         case 32:
 950                 *(u32 *) value = readl(virt_addr);
 951                 break;
 952         case 64:
 953                 *(u64 *) value = read64(virt_addr);
 954                 break;
 955         default:
 956                 BUG();
 957         }
 958
 959         if (unmap)
 960                 iounmap(virt_addr);
 961         else
 962                 rcu_read_unlock();
 963
 964         return AE_OK;
 965 }
 966
 967 #ifdef writeq
 968 static inline void write64(u64 val, volatile void __iomem *addr)
 969 {
 970         writeq(val, addr);
 971 }
 972 #else
 973 static inline void write64(u64 val, volatile void __iomem *addr)
 974 {
 975         writel(val, addr);
 976         writel(val>>32, addr+4);
 977 }
 978 #endif
 979
 980 acpi_status
 981 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 982 {
 983         void __iomem *virt_addr;
 984         unsigned int size = width / 8;
 985         bool unmap = false;
 986
 987         rcu_read_lock();
 988         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
 989         if (!virt_addr) {
 990                 rcu_read_unlock();
 991                 virt_addr = acpi_os_ioremap(phys_addr, size);
 992                 if (!virt_addr)
 993                         return AE_BAD_ADDRESS;
 994                 unmap = true;
 995         }
 996
 997         switch (width) {
 998         case 8:
 999                 writeb(value, virt_addr);
1000                 break;
1001         case 16:
1002                 writew(value, virt_addr);
1003                 break;
1004         case 32:
1005                 writel(value, virt_addr);
1006                 break;
1007         case 64:
1008                 write64(value, virt_addr);
1009                 break;
1010         default:
1011                 BUG();
1012         }
1013
1014         if (unmap)
1015                 iounmap(virt_addr);
1016         else
1017                 rcu_read_unlock();
1018
1019         return AE_OK;
1020 }
1021
1022 acpi_status
1023 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1024                                u64 *value, u32 width)
1025 {
1026         int result, size;
1027         u32 value32;
1028
1029         if (!value)
1030                 return AE_BAD_PARAMETER;
1031
1032         switch (width) {
1033         case 8:
1034                 size = 1;
1035                 break;
1036         case 16:
1037                 size = 2;
1038                 break;
1039         case 32:
1040                 size = 4;
1041                 break;
1042         default:
1043                 return AE_ERROR;
1044         }
1045
1046         result = raw_pci_read(pci_id->segment, pci_id->bus,
1047                                 PCI_DEVFN(pci_id->device, pci_id->function),
1048                                 reg, size, &value32);
1049         *value = value32;
1050
1051         return (result ? AE_ERROR : AE_OK);
1052 }
1053
1054 acpi_status
1055 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1056                                 u64 value, u32 width)
1057 {
1058         int result, size;
1059
1060         switch (width) {
1061         case 8:
1062                 size = 1;
1063                 break;
1064         case 16:
1065                 size = 2;
1066                 break;
1067         case 32:
1068                 size = 4;
1069                 break;
1070         default:
1071                 return AE_ERROR;
1072         }
1073
1074         result = raw_pci_write(pci_id->segment, pci_id->bus,
1075                                 PCI_DEVFN(pci_id->device, pci_id->function),
1076                                 reg, size, value);
1077
1078         return (result ? AE_ERROR : AE_OK);
1079 }
1080
1081 static void acpi_os_execute_deferred(struct work_struct *work)
1082 {
1083         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1084
1085         dpc->function(dpc->context);
1086         kfree(dpc);
1087 }
1088
1089 /*******************************************************************************
1090  *
1091  * FUNCTION:    acpi_os_execute
1092  *
1093  * PARAMETERS:  Type               - Type of the callback
1094  *              Function           - Function to be executed
1095  *              Context            - Function parameters
1096  *
1097  * RETURN:      Status
1098  *
1099  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1100  *              immediately executes function on a separate thread.
1101  *
1102  ******************************************************************************/
1103
1104 acpi_status acpi_os_execute(acpi_execute_type type,
1105                             acpi_osd_exec_callback function, void *context)
1106 {
1107         acpi_status status = AE_OK;
1108         struct acpi_os_dpc *dpc;
1109         struct workqueue_struct *queue;
1110         int ret;
1111         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1112                           "Scheduling function [%p(%p)] for deferred execution.\n",
1113                           function, context));
1114
1115         /*
1116          * Allocate/initialize DPC structure.  Note that this memory will be
1117          * freed by the callee.  The kernel handles the work_struct list  in a
1118          * way that allows us to also free its memory inside the callee.
1119          * Because we may want to schedule several tasks with different
1120          * parameters we can't use the approach some kernel code uses of
1121          * having a static work_struct.
1122          */
1123
1124         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1125         if (!dpc)
1126                 return AE_NO_MEMORY;
1127
1128         dpc->function = function;
1129         dpc->context = context;
1130
1131         /*
1132          * To prevent lockdep from complaining unnecessarily, make sure that
1133          * there is a different static lockdep key for each workqueue by using
1134          * INIT_WORK() for each of them separately.
1135          */
1136         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 EXPORT_SYMBOL(acpi_os_execute);
1162
1163 void acpi_os_wait_events_complete(void)
1164 {
1165         flush_workqueue(kacpid_wq);
1166         flush_workqueue(kacpi_notify_wq);
1167 }
1168
1169 struct acpi_hp_work {
1170         struct work_struct work;
1171         struct acpi_device *adev;
1172         u32 src;
1173 };
1174
1175 static void acpi_hotplug_work_fn(struct work_struct *work)
1176 {
1177         struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1178
1179         acpi_os_wait_events_complete();
1180         acpi_device_hotplug(hpw->adev, hpw->src);
1181         kfree(hpw);
1182 }
1183
1184 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1185 {
1186         struct acpi_hp_work *hpw;
1187
1188         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1189                   "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1190                   adev, src));
1191
1192         hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1193         if (!hpw)
1194                 return AE_NO_MEMORY;
1195
1196         INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1197         hpw->adev = adev;
1198         hpw->src = src;
1199         /*
1200          * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1201          * the hotplug code may call driver .remove() functions, which may
1202          * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1203          * these workqueues.
1204          */
1205         if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1206                 kfree(hpw);
1207                 return AE_ERROR;
1208         }
1209         return AE_OK;
1210 }
1211
1212 bool acpi_queue_hotplug_work(struct work_struct *work)
1213 {
1214         return queue_work(kacpi_hotplug_wq, work);
1215 }
1216
1217 acpi_status
1218 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1219 {
1220         struct semaphore *sem = NULL;
1221
1222         sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1223         if (!sem)
1224                 return AE_NO_MEMORY;
1225
1226         sema_init(sem, initial_units);
1227
1228         *handle = (acpi_handle *) sem;
1229
1230         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1231                           *handle, initial_units));
1232
1233         return AE_OK;
1234 }
1235
1236 /*
1237  * TODO: A better way to delete semaphores?  Linux doesn't have a
1238  * 'delete_semaphore()' function -- may result in an invalid
1239  * pointer dereference for non-synchronized consumers.  Should
1240  * we at least check for blocked threads and signal/cancel them?
1241  */
1242
1243 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1244 {
1245         struct semaphore *sem = (struct semaphore *)handle;
1246
1247         if (!sem)
1248                 return AE_BAD_PARAMETER;
1249
1250         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1251
1252         BUG_ON(!list_empty(&sem->wait_list));
1253         kfree(sem);
1254         sem = NULL;
1255
1256         return AE_OK;
1257 }
1258
1259 /*
1260  * TODO: Support for units > 1?
1261  */
1262 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1263 {
1264         acpi_status status = AE_OK;
1265         struct semaphore *sem = (struct semaphore *)handle;
1266         long jiffies;
1267         int ret = 0;
1268
1269         if (!sem || (units < 1))
1270                 return AE_BAD_PARAMETER;
1271
1272         if (units > 1)
1273                 return AE_SUPPORT;
1274
1275         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1276                           handle, units, timeout));
1277
1278         if (timeout == ACPI_WAIT_FOREVER)
1279                 jiffies = MAX_SCHEDULE_TIMEOUT;
1280         else
1281                 jiffies = msecs_to_jiffies(timeout);
1282
1283         ret = down_timeout(sem, jiffies);
1284         if (ret)
1285                 status = AE_TIME;
1286
1287         if (ACPI_FAILURE(status)) {
1288                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1289                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1290                                   handle, units, timeout,
1291                                   acpi_format_exception(status)));
1292         } else {
1293                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1294                                   "Acquired semaphore[%p|%d|%d]", handle,
1295                                   units, timeout));
1296         }
1297
1298         return status;
1299 }
1300
1301 /*
1302  * TODO: Support for units > 1?
1303  */
1304 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1305 {
1306         struct semaphore *sem = (struct semaphore *)handle;
1307
1308         if (!sem || (units < 1))
1309                 return AE_BAD_PARAMETER;
1310
1311         if (units > 1)
1312                 return AE_SUPPORT;
1313
1314         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1315                           units));
1316
1317         up(sem);
1318
1319         return AE_OK;
1320 }
1321
1322 #ifdef ACPI_FUTURE_USAGE
1323 u32 acpi_os_get_line(char *buffer)
1324 {
1325
1326 #ifdef ENABLE_DEBUGGER
1327         if (acpi_in_debugger) {
1328                 u32 chars;
1329
1330                 kdb_read(buffer, sizeof(line_buf));
1331
1332                 /* remove the CR kdb includes */
1333                 chars = strlen(buffer) - 1;
1334                 buffer[chars] = '\0';
1335         }
1336 #endif
1337
1338         return 0;
1339 }
1340 #endif                          /*  ACPI_FUTURE_USAGE  */
1341
1342 acpi_status acpi_os_signal(u32 function, void *info)
1343 {
1344         switch (function) {
1345         case ACPI_SIGNAL_FATAL:
1346                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1347                 break;
1348         case ACPI_SIGNAL_BREAKPOINT:
1349                 /*
1350                  * AML Breakpoint
1351                  * ACPI spec. says to treat it as a NOP unless
1352                  * you are debugging.  So if/when we integrate
1353                  * AML debugger into the kernel debugger its
1354                  * hook will go here.  But until then it is
1355                  * not useful to print anything on breakpoints.
1356                  */
1357                 break;
1358         default:
1359                 break;
1360         }
1361
1362         return AE_OK;
1363 }
1364
1365 static int __init acpi_os_name_setup(char *str)
1366 {
1367         char *p = acpi_os_name;
1368         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1369
1370         if (!str || !*str)
1371                 return 0;
1372
1373         for (; count-- && *str; str++) {
1374                 if (isalnum(*str) || *str == ' ' || *str == ':')
1375                         *p++ = *str;
1376                 else if (*str == '\'' || *str == '"')
1377                         continue;
1378                 else
1379                         break;
1380         }
1381         *p = 0;
1382
1383         return 1;
1384
1385 }
1386
1387 __setup("acpi_os_name=", acpi_os_name_setup);
1388
1389 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1390 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1391
1392 struct osi_setup_entry {
1393         char string[OSI_STRING_LENGTH_MAX];
1394         bool enable;
1395 };
1396
1397 static struct osi_setup_entry
1398                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1399         {"Module Device", true},
1400         {"Processor Device", true},
1401         {"3.0 _SCP Extensions", true},
1402         {"Processor Aggregator Device", true},
1403 };
1404
1405 void __init acpi_osi_setup(char *str)
1406 {
1407         struct osi_setup_entry *osi;
1408         bool enable = true;
1409         int i;
1410
1411         if (!acpi_gbl_create_osi_method)
1412                 return;
1413
1414         if (str == NULL || *str == '\0') {
1415                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1416                 acpi_gbl_create_osi_method = FALSE;
1417                 return;
1418         }
1419
1420         if (*str == '!') {
1421                 str++;
1422                 if (*str == '\0') {
1423                         osi_linux.default_disabling = 1;
1424                         return;
1425                 } else if (*str == '*') {
1426                         acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1427                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1428                                 osi = &osi_setup_entries[i];
1429                                 osi->enable = false;
1430                         }
1431                         return;
1432                 }
1433                 enable = false;
1434         }
1435
1436         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1437                 osi = &osi_setup_entries[i];
1438                 if (!strcmp(osi->string, str)) {
1439                         osi->enable = enable;
1440                         break;
1441                 } else if (osi->string[0] == '\0') {
1442                         osi->enable = enable;
1443                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1444                         break;
1445                 }
1446         }
1447 }
1448
1449 static void __init set_osi_linux(unsigned int enable)
1450 {
1451         if (osi_linux.enable != enable)
1452                 osi_linux.enable = enable;
1453
1454         if (osi_linux.enable)
1455                 acpi_osi_setup("Linux");
1456         else
1457                 acpi_osi_setup("!Linux");
1458
1459         return;
1460 }
1461
1462 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1463 {
1464         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1465         osi_linux.dmi = 0;
1466         set_osi_linux(enable);
1467
1468         return;
1469 }
1470
1471 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1472 {
1473         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1474
1475         if (enable == -1)
1476                 return;
1477
1478         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1479         set_osi_linux(enable);
1480
1481         return;
1482 }
1483
1484 /*
1485  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1486  *
1487  * empty string disables _OSI
1488  * string starting with '!' disables that string
1489  * otherwise string is added to list, augmenting built-in strings
1490  */
1491 static void __init acpi_osi_setup_late(void)
1492 {
1493         struct osi_setup_entry *osi;
1494         char *str;
1495         int i;
1496         acpi_status status;
1497
1498         if (osi_linux.default_disabling) {
1499                 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1500
1501                 if (ACPI_SUCCESS(status))
1502                         printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1503         }
1504
1505         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1506                 osi = &osi_setup_entries[i];
1507                 str = osi->string;
1508
1509                 if (*str == '\0')
1510                         break;
1511                 if (osi->enable) {
1512                         status = acpi_install_interface(str);
1513
1514                         if (ACPI_SUCCESS(status))
1515                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1516                 } else {
1517                         status = acpi_remove_interface(str);
1518
1519                         if (ACPI_SUCCESS(status))
1520                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1521                 }
1522         }
1523 }
1524
1525 static int __init osi_setup(char *str)
1526 {
1527         if (str && !strcmp("Linux", str))
1528                 acpi_cmdline_osi_linux(1);
1529         else if (str && !strcmp("!Linux", str))
1530                 acpi_cmdline_osi_linux(0);
1531         else
1532                 acpi_osi_setup(str);
1533
1534         return 1;
1535 }
1536
1537 __setup("acpi_osi=", osi_setup);
1538
1539 /*
1540  * Disable the auto-serialization of named objects creation methods.
1541  *
1542  * This feature is enabled by default.  It marks the AML control methods
1543  * that contain the opcodes to create named objects as "Serialized".
1544  */
1545 static int __init acpi_no_auto_serialize_setup(char *str)
1546 {
1547         acpi_gbl_auto_serialize_methods = FALSE;
1548         pr_info("ACPI: auto-serialization disabled\n");
1549
1550         return 1;
1551 }
1552
1553 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1554
1555 /* Check of resource interference between native drivers and ACPI
1556  * OperationRegions (SystemIO and System Memory only).
1557  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1558  * in arbitrary AML code and can interfere with legacy drivers.
1559  * acpi_enforce_resources= can be set to:
1560  *
1561  *   - strict (default) (2)
1562  *     -> further driver trying to access the resources will not load
1563  *   - lax              (1)
1564  *     -> further driver trying to access the resources will load, but you
1565  *     get a system message that something might go wrong...
1566  *
1567  *   - no               (0)
1568  *     -> ACPI Operation Region resources will not be registered
1569  *
1570  */
1571 #define ENFORCE_RESOURCES_STRICT 2
1572 #define ENFORCE_RESOURCES_LAX    1
1573 #define ENFORCE_RESOURCES_NO     0
1574
1575 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1576
1577 static int __init acpi_enforce_resources_setup(char *str)
1578 {
1579         if (str == NULL || *str == '\0')
1580                 return 0;
1581
1582         if (!strcmp("strict", str))
1583                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1584         else if (!strcmp("lax", str))
1585                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1586         else if (!strcmp("no", str))
1587                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1588
1589         return 1;
1590 }
1591
1592 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1593
1594 /* Check for resource conflicts between ACPI OperationRegions and native
1595  * drivers */
1596 int acpi_check_resource_conflict(const struct resource *res)
1597 {
1598         acpi_adr_space_type space_id;
1599         acpi_size length;
1600         u8 warn = 0;
1601         int clash = 0;
1602
1603         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1604                 return 0;
1605         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1606                 return 0;
1607
1608         if (res->flags & IORESOURCE_IO)
1609                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1610         else
1611                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1612
1613         length = resource_size(res);
1614         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1615                 warn = 1;
1616         clash = acpi_check_address_range(space_id, res->start, length, warn);
1617
1618         if (clash) {
1619                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1620                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1621                                 printk(KERN_NOTICE "ACPI: This conflict may"
1622                                        " cause random problems and system"
1623                                        " instability\n");
1624                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1625                                " for this device, you should use it instead of"
1626                                " the native driver\n");
1627                 }
1628                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1629                         return -EBUSY;
1630         }
1631         return 0;
1632 }
1633 EXPORT_SYMBOL(acpi_check_resource_conflict);
1634
1635 int acpi_check_region(resource_size_t start, resource_size_t n,
1636                       const char *name)
1637 {
1638         struct resource res = {
1639                 .start = start,
1640                 .end   = start + n - 1,
1641                 .name  = name,
1642                 .flags = IORESOURCE_IO,
1643         };
1644
1645         return acpi_check_resource_conflict(&res);
1646 }
1647 EXPORT_SYMBOL(acpi_check_region);
1648
1649 /*
1650  * Let drivers know whether the resource checks are effective
1651  */
1652 int acpi_resources_are_enforced(void)
1653 {
1654         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1655 }
1656 EXPORT_SYMBOL(acpi_resources_are_enforced);
1657
1658 /*
1659  * Deallocate the memory for a spinlock.
1660  */
1661 void acpi_os_delete_lock(acpi_spinlock handle)
1662 {
1663         ACPI_FREE(handle);
1664 }
1665
1666 /*
1667  * Acquire a spinlock.
1668  *
1669  * handle is a pointer to the spinlock_t.
1670  */
1671
1672 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1673 {
1674         acpi_cpu_flags flags;
1675         spin_lock_irqsave(lockp, flags);
1676         return flags;
1677 }
1678
1679 /*
1680  * Release a spinlock. See above.
1681  */
1682
1683 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1684 {
1685         spin_unlock_irqrestore(lockp, flags);
1686 }
1687
1688 #ifndef ACPI_USE_LOCAL_CACHE
1689
1690 /*******************************************************************************
1691  *
1692  * FUNCTION:    acpi_os_create_cache
1693  *
1694  * PARAMETERS:  name      - Ascii name for the cache
1695  *              size      - Size of each cached object
1696  *              depth     - Maximum depth of the cache (in objects) <ignored>
1697  *              cache     - Where the new cache object is returned
1698  *
1699  * RETURN:      status
1700  *
1701  * DESCRIPTION: Create a cache object
1702  *
1703  ******************************************************************************/
1704
1705 acpi_status
1706 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1707 {
1708         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1709         if (*cache == NULL)
1710                 return AE_ERROR;
1711         else
1712                 return AE_OK;
1713 }
1714
1715 /*******************************************************************************
1716  *
1717  * FUNCTION:    acpi_os_purge_cache
1718  *
1719  * PARAMETERS:  Cache           - Handle to cache object
1720  *
1721  * RETURN:      Status
1722  *
1723  * DESCRIPTION: Free all objects within the requested cache.
1724  *
1725  ******************************************************************************/
1726
1727 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1728 {
1729         kmem_cache_shrink(cache);
1730         return (AE_OK);
1731 }
1732
1733 /*******************************************************************************
1734  *
1735  * FUNCTION:    acpi_os_delete_cache
1736  *
1737  * PARAMETERS:  Cache           - Handle to cache object
1738  *
1739  * RETURN:      Status
1740  *
1741  * DESCRIPTION: Free all objects within the requested cache and delete the
1742  *              cache object.
1743  *
1744  ******************************************************************************/
1745
1746 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1747 {
1748         kmem_cache_destroy(cache);
1749         return (AE_OK);
1750 }
1751
1752 /*******************************************************************************
1753  *
1754  * FUNCTION:    acpi_os_release_object
1755  *
1756  * PARAMETERS:  Cache       - Handle to cache object
1757  *              Object      - The object to be released
1758  *
1759  * RETURN:      None
1760  *
1761  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1762  *              the object is deleted.
1763  *
1764  ******************************************************************************/
1765
1766 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1767 {
1768         kmem_cache_free(cache, object);
1769         return (AE_OK);
1770 }
1771 #endif
1772
1773 static int __init acpi_no_auto_ssdt_setup(char *s)
1774 {
1775         printk(KERN_NOTICE PREFIX "SSDT auto-load disabled\n");
1776
1777         acpi_gbl_disable_ssdt_table_load = TRUE;
1778
1779         return 1;
1780 }
1781
1782 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
1783
1784 static int __init acpi_disable_return_repair(char *s)
1785 {
1786         printk(KERN_NOTICE PREFIX
1787                "ACPI: Predefined validation mechanism disabled\n");
1788         acpi_gbl_disable_auto_repair = TRUE;
1789
1790         return 1;
1791 }
1792
1793 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1794
1795 acpi_status __init acpi_os_initialize(void)
1796 {
1797         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1798         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1799         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1800         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1801
1802         return AE_OK;
1803 }
1804
1805 acpi_status __init acpi_os_initialize1(void)
1806 {
1807         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1808         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1809         kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1810         BUG_ON(!kacpid_wq);
1811         BUG_ON(!kacpi_notify_wq);
1812         BUG_ON(!kacpi_hotplug_wq);
1813         acpi_install_interface_handler(acpi_osi_handler);
1814         acpi_osi_setup_late();
1815         return AE_OK;
1816 }
1817
1818 acpi_status acpi_os_terminate(void)
1819 {
1820         if (acpi_irq_handler) {
1821                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1822                                                  acpi_irq_handler);
1823         }
1824
1825         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1826         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1827         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1828         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1829
1830         destroy_workqueue(kacpid_wq);
1831         destroy_workqueue(kacpi_notify_wq);
1832         destroy_workqueue(kacpi_hotplug_wq);
1833
1834         return AE_OK;
1835 }
1836
1837 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1838                                   u32 pm1b_control)
1839 {
1840         int rc = 0;
1841         if (__acpi_os_prepare_sleep)
1842                 rc = __acpi_os_prepare_sleep(sleep_state,
1843                                              pm1a_control, pm1b_control);
1844         if (rc < 0)
1845                 return AE_ERROR;
1846         else if (rc > 0)
1847                 return AE_CTRL_SKIP;
1848
1849         return AE_OK;
1850 }
1851
1852 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1853                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1854 {
1855         __acpi_os_prepare_sleep = func;
1856 }
1857
1858 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1859                                   u32 val_b)
1860 {
1861         int rc = 0;
1862         if (__acpi_os_prepare_extended_sleep)
1863                 rc = __acpi_os_prepare_extended_sleep(sleep_state,
1864                                              val_a, val_b);
1865         if (rc < 0)
1866                 return AE_ERROR;
1867         else if (rc > 0)
1868                 return AE_CTRL_SKIP;
1869
1870         return AE_OK;
1871 }
1872
1873 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1874                                u32 val_a, u32 val_b))
1875 {
1876         __acpi_os_prepare_extended_sleep = func;
1877 }