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   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  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/mm.h>
  32 #include <linux/pci.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/kmod.h>
  35 #include <linux/delay.h>
  36 #include <linux/dmi.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/nmi.h>
  39 #include <linux/acpi.h>
  40 #include <acpi/acpi.h>
  41 #include <asm/io.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/processor.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <linux/efi.h>
  47
  48 #define _COMPONENT              ACPI_OS_SERVICES
  49 ACPI_MODULE_NAME("osl");
  50 #define PREFIX          "ACPI: "
  51 struct acpi_os_dpc {
  52         acpi_osd_exec_callback function;
  53         void *context;
  54         struct work_struct work;
  55 };
  56
  57 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  58 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  59 #endif
  60
  61 #ifdef ENABLE_DEBUGGER
  62 #include <linux/kdb.h>
  63
  64 /* stuff for debugger support */
  65 int acpi_in_debugger;
  66 EXPORT_SYMBOL(acpi_in_debugger);
  67
  68 extern char line_buf[80];
  69 #endif                          /*ENABLE_DEBUGGER */
  70
  71 static unsigned int acpi_irq_irq;
  72 static acpi_osd_handler acpi_irq_handler;
  73 static void *acpi_irq_context;
  74 static struct workqueue_struct *kacpid_wq;
  75 static struct workqueue_struct *kacpi_notify_wq;
  76
  77 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  78 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  79
  80 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
  81 static int acpi_no_initrd_override;
  82 #endif
  83
  84 /*
  85  * "Ode to _OSI(Linux)"
  86  *
  87  * osi_linux -- Control response to BIOS _OSI(Linux) query.
  88  *
  89  * As Linux evolves, the features that it supports change.
  90  * So an OSI string such as "Linux" is not specific enough
  91  * to be useful across multiple versions of Linux.  It
  92  * doesn't identify any particular feature, interface,
  93  * or even any particular version of Linux...
  94  *
  95  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
  96  * to a BIOS _OSI(Linux) query.  When
  97  * a reference mobile BIOS started using it, its use
  98  * started to spread to many vendor platforms.
  99  * As it is not supportable, we need to halt that spread.
 100  *
 101  * Today, most BIOS references to _OSI(Linux) are noise --
 102  * they have no functional effect and are just dead code
 103  * carried over from the reference BIOS.
 104  *
 105  * The next most common case is that _OSI(Linux) harms Linux,
 106  * usually by causing the BIOS to follow paths that are
 107  * not tested during Windows validation.
 108  *
 109  * Finally, there is a short list of platforms
 110  * where OSI(Linux) benefits Linux.
 111  *
 112  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
 113  * DMI is used to disable the dmesg warning about OSI(Linux)
 114  * on platforms where it is known to have no effect.
 115  * But a dmesg warning remains for systems where
 116  * we do not know if OSI(Linux) is good or bad for the system.
 117  * DMI is also used to enable OSI(Linux) for the machines
 118  * that are known to need it.
 119  *
 120  * BIOS writers should NOT query _OSI(Linux) on future systems.
 121  * It will be ignored by default, and to get Linux to
 122  * not ignore it will require a kernel source update to
 123  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
 124  */
 125 #define OSI_LINUX_ENABLE 0
 126
 127 struct osi_linux {
 128         unsigned int    enable:1;
 129         unsigned int    dmi:1;
 130         unsigned int    cmdline:1;
 131         unsigned int    known:1;
 132 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
 133
 134 static void __init acpi_request_region (struct acpi_generic_address *addr,
 135         unsigned int length, char *desc)
 136 {
 137         struct resource *res;
 138
 139         if (!addr->address || !length)
 140                 return;
 141
 142         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 143                 res = request_region(addr->address, length, desc);
 144         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 145                 res = request_mem_region(addr->address, length, desc);
 146 }
 147
 148 static int __init acpi_reserve_resources(void)
 149 {
 150         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 151                 "ACPI PM1a_EVT_BLK");
 152
 153         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 154                 "ACPI PM1b_EVT_BLK");
 155
 156         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 157                 "ACPI PM1a_CNT_BLK");
 158
 159         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 160                 "ACPI PM1b_CNT_BLK");
 161
 162         if (acpi_gbl_FADT.pm_timer_length == 4)
 163                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 164
 165         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 166                 "ACPI PM2_CNT_BLK");
 167
 168         /* Length of GPE blocks must be a non-negative multiple of 2 */
 169
 170         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 171                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 172                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 173
 174         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 175                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 176                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 177
 178         return 0;
 179 }
 180 device_initcall(acpi_reserve_resources);
 181
 182 acpi_status __init acpi_os_initialize(void)
 183 {
 184         return AE_OK;
 185 }
 186
 187 acpi_status acpi_os_initialize1(void)
 188 {
 189         /*
 190          * Initialize PCI configuration space access, as we'll need to access
 191          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 192          */
 193         if (!raw_pci_ops) {
 194                 printk(KERN_ERR PREFIX
 195                        "Access to PCI configuration space unavailable\n");
 196                 return AE_NULL_ENTRY;
 197         }
 198         kacpid_wq = create_singlethread_workqueue("kacpid");
 199         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 200         BUG_ON(!kacpid_wq);
 201         BUG_ON(!kacpi_notify_wq);
 202         return AE_OK;
 203 }
 204
 205 acpi_status acpi_os_terminate(void)
 206 {
 207         if (acpi_irq_handler) {
 208                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 209                                                  acpi_irq_handler);
 210         }
 211
 212         destroy_workqueue(kacpid_wq);
 213         destroy_workqueue(kacpi_notify_wq);
 214
 215         return AE_OK;
 216 }
 217
 218 void acpi_os_printf(const char *fmt, ...)
 219 {
 220         va_list args;
 221         va_start(args, fmt);
 222         acpi_os_vprintf(fmt, args);
 223         va_end(args);
 224 }
 225
 226 EXPORT_SYMBOL(acpi_os_printf);
 227
 228 void acpi_os_vprintf(const char *fmt, va_list args)
 229 {
 230         static char buffer[512];
 231
 232         vsprintf(buffer, fmt, args);
 233
 234 #ifdef ENABLE_DEBUGGER
 235         if (acpi_in_debugger) {
 236                 kdb_printf("%s", buffer);
 237         } else {
 238                 printk("%s", buffer);
 239         }
 240 #else
 241         printk("%s", buffer);
 242 #endif
 243 }
 244
 245 acpi_physical_address __init acpi_os_get_root_pointer(void)
 246 {
 247         if (efi_enabled) {
 248                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 249                         return efi.acpi20;
 250                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 251                         return efi.acpi;
 252                 else {
 253                         printk(KERN_ERR PREFIX
 254                                "System description tables not found\n");
 255                         return 0;
 256                 }
 257         } else
 258                 return acpi_find_rsdp();
 259 }
 260
 261 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 262 {
 263         if (phys > ULONG_MAX) {
 264                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 265                 return NULL;
 266         }
 267         if (acpi_gbl_permanent_mmap)
 268                 /*
 269                 * ioremap checks to ensure this is in reserved space
 270                 */
 271                 return ioremap((unsigned long)phys, size);
 272         else
 273                 return __acpi_map_table((unsigned long)phys, size);
 274 }
 275 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 276
 277 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 278 {
 279         if (acpi_gbl_permanent_mmap) {
 280                 iounmap(virt);
 281         }
 282 }
 283 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 284
 285 #ifdef ACPI_FUTURE_USAGE
 286 acpi_status
 287 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 288 {
 289         if (!phys || !virt)
 290                 return AE_BAD_PARAMETER;
 291
 292         *phys = virt_to_phys(virt);
 293
 294         return AE_OK;
 295 }
 296 #endif
 297
 298 #define ACPI_MAX_OVERRIDE_LEN 100
 299
 300 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 301
 302 acpi_status
 303 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 304                             acpi_string * new_val)
 305 {
 306         if (!init_val || !new_val)
 307                 return AE_BAD_PARAMETER;
 308
 309         *new_val = NULL;
 310         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 311                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 312                        acpi_os_name);
 313                 *new_val = acpi_os_name;
 314         }
 315
 316         return AE_OK;
 317 }
 318
 319 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
 320 struct acpi_table_header *acpi_find_dsdt_initrd(void)
 321 {
 322         struct file *firmware_file;
 323         mm_segment_t oldfs;
 324         unsigned long len, len2;
 325         struct acpi_table_header *dsdt_buffer, *ret = NULL;
 326         struct kstat stat;
 327         char *ramfs_dsdt_name = "/DSDT.aml";
 328
 329         printk(KERN_INFO PREFIX "Looking for DSDT in initramfs... ");
 330
 331         /*
 332          * Never do this at home, only the user-space is allowed to open a file.
 333          * The clean way would be to use the firmware loader. But this code must be run
 334          * before there is any userspace available. So we need a static/init firmware
 335          * infrastructure, which doesn't exist yet...
 336          */
 337         if (vfs_stat(ramfs_dsdt_name, &stat) < 0) {
 338                 printk("not found.\n");
 339                 return ret;
 340         }
 341
 342         len = stat.size;
 343         /* check especially against empty files */
 344         if (len <= 4) {
 345                 printk("error, file is too small: only %lu bytes.\n", len);
 346                 return ret;
 347         }
 348
 349         firmware_file = filp_open(ramfs_dsdt_name, O_RDONLY, 0);
 350         if (IS_ERR(firmware_file)) {
 351                 printk("error, could not open file %s.\n", ramfs_dsdt_name);
 352                 return ret;
 353         }
 354
 355         dsdt_buffer = ACPI_ALLOCATE(len);
 356         if (!dsdt_buffer) {
 357                 printk("error when allocating %lu bytes of memory.\n", len);
 358                 goto err;
 359         }
 360
 361         oldfs = get_fs();
 362         set_fs(KERNEL_DS);
 363         len2 = vfs_read(firmware_file, (char __user *)dsdt_buffer, len, &firmware_file->f_pos);
 364         set_fs(oldfs);
 365         if (len2 < len) {
 366                 printk("error trying to read %lu bytes from %s.\n", len, ramfs_dsdt_name);
 367                 ACPI_FREE(dsdt_buffer);
 368                 goto err;
 369         }
 370
 371         printk("successfully read %lu bytes from %s.\n", len, ramfs_dsdt_name);
 372         ret = dsdt_buffer;
 373 err:
 374         filp_close(firmware_file, NULL);
 375         return ret;
 376 }
 377 #endif
 378
 379 acpi_status
 380 acpi_os_table_override(struct acpi_table_header * existing_table,
 381                        struct acpi_table_header ** new_table)
 382 {
 383         if (!existing_table || !new_table)
 384                 return AE_BAD_PARAMETER;
 385
 386         *new_table = NULL;
 387
 388 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 389         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 390                 *new_table = (struct acpi_table_header *)AmlCode;
 391 #endif
 392 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
 393         if ((strncmp(existing_table->signature, "DSDT", 4) == 0) &&
 394             !acpi_no_initrd_override) {
 395                 struct acpi_table_header *initrd_table = acpi_find_dsdt_initrd();
 396                 if (initrd_table)
 397                         *new_table = initrd_table;
 398         }
 399 #endif
 400         if (*new_table != NULL) {
 401                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 402                            "this is unsafe: tainting kernel\n",
 403                        existing_table->signature,
 404                        existing_table->oem_table_id);
 405                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 406         }
 407         return AE_OK;
 408 }
 409
 410 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
 411 int __init acpi_no_initrd_override_setup(char *s)
 412 {
 413         acpi_no_initrd_override = 1;
 414         return 1;
 415 }
 416 __setup("acpi_no_initrd_override", acpi_no_initrd_override_setup);
 417 #endif
 418
 419 static irqreturn_t acpi_irq(int irq, void *dev_id)
 420 {
 421         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 422 }
 423
 424 acpi_status
 425 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 426                                   void *context)
 427 {
 428         unsigned int irq;
 429
 430         /*
 431          * Ignore the GSI from the core, and use the value in our copy of the
 432          * FADT. It may not be the same if an interrupt source override exists
 433          * for the SCI.
 434          */
 435         gsi = acpi_gbl_FADT.sci_interrupt;
 436         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 437                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 438                        gsi);
 439                 return AE_OK;
 440         }
 441
 442         acpi_irq_handler = handler;
 443         acpi_irq_context = context;
 444         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 445                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 446                 return AE_NOT_ACQUIRED;
 447         }
 448         acpi_irq_irq = irq;
 449
 450         return AE_OK;
 451 }
 452
 453 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 454 {
 455         if (irq) {
 456                 free_irq(irq, acpi_irq);
 457                 acpi_irq_handler = NULL;
 458                 acpi_irq_irq = 0;
 459         }
 460
 461         return AE_OK;
 462 }
 463
 464 /*
 465  * Running in interpreter thread context, safe to sleep
 466  */
 467
 468 void acpi_os_sleep(acpi_integer ms)
 469 {
 470         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 471 }
 472
 473 EXPORT_SYMBOL(acpi_os_sleep);
 474
 475 void acpi_os_stall(u32 us)
 476 {
 477         while (us) {
 478                 u32 delay = 1000;
 479
 480                 if (delay > us)
 481                         delay = us;
 482                 udelay(delay);
 483                 touch_nmi_watchdog();
 484                 us -= delay;
 485         }
 486 }
 487
 488 EXPORT_SYMBOL(acpi_os_stall);
 489
 490 /*
 491  * Support ACPI 3.0 AML Timer operand
 492  * Returns 64-bit free-running, monotonically increasing timer
 493  * with 100ns granularity
 494  */
 495 u64 acpi_os_get_timer(void)
 496 {
 497         static u64 t;
 498
 499 #ifdef  CONFIG_HPET
 500         /* TBD: use HPET if available */
 501 #endif
 502
 503 #ifdef  CONFIG_X86_PM_TIMER
 504         /* TBD: default to PM timer if HPET was not available */
 505 #endif
 506         if (!t)
 507                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 508
 509         return ++t;
 510 }
 511
 512 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 513 {
 514         u32 dummy;
 515
 516         if (!value)
 517                 value = &dummy;
 518
 519         *value = 0;
 520         if (width <= 8) {
 521                 *(u8 *) value = inb(port);
 522         } else if (width <= 16) {
 523                 *(u16 *) value = inw(port);
 524         } else if (width <= 32) {
 525                 *(u32 *) value = inl(port);
 526         } else {
 527                 BUG();
 528         }
 529
 530         return AE_OK;
 531 }
 532
 533 EXPORT_SYMBOL(acpi_os_read_port);
 534
 535 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 536 {
 537         if (width <= 8) {
 538                 outb(value, port);
 539         } else if (width <= 16) {
 540                 outw(value, port);
 541         } else if (width <= 32) {
 542                 outl(value, port);
 543         } else {
 544                 BUG();
 545         }
 546
 547         return AE_OK;
 548 }
 549
 550 EXPORT_SYMBOL(acpi_os_write_port);
 551
 552 acpi_status
 553 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 554 {
 555         u32 dummy;
 556         void __iomem *virt_addr;
 557
 558         virt_addr = ioremap(phys_addr, width);
 559         if (!value)
 560                 value = &dummy;
 561
 562         switch (width) {
 563         case 8:
 564                 *(u8 *) value = readb(virt_addr);
 565                 break;
 566         case 16:
 567                 *(u16 *) value = readw(virt_addr);
 568                 break;
 569         case 32:
 570                 *(u32 *) value = readl(virt_addr);
 571                 break;
 572         default:
 573                 BUG();
 574         }
 575
 576         iounmap(virt_addr);
 577
 578         return AE_OK;
 579 }
 580
 581 acpi_status
 582 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 583 {
 584         void __iomem *virt_addr;
 585
 586         virt_addr = ioremap(phys_addr, width);
 587
 588         switch (width) {
 589         case 8:
 590                 writeb(value, virt_addr);
 591                 break;
 592         case 16:
 593                 writew(value, virt_addr);
 594                 break;
 595         case 32:
 596                 writel(value, virt_addr);
 597                 break;
 598         default:
 599                 BUG();
 600         }
 601
 602         iounmap(virt_addr);
 603
 604         return AE_OK;
 605 }
 606
 607 acpi_status
 608 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 609                                void *value, u32 width)
 610 {
 611         int result, size;
 612
 613         if (!value)
 614                 return AE_BAD_PARAMETER;
 615
 616         switch (width) {
 617         case 8:
 618                 size = 1;
 619                 break;
 620         case 16:
 621                 size = 2;
 622                 break;
 623         case 32:
 624                 size = 4;
 625                 break;
 626         default:
 627                 return AE_ERROR;
 628         }
 629
 630         BUG_ON(!raw_pci_ops);
 631
 632         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 633                                    PCI_DEVFN(pci_id->device, pci_id->function),
 634                                    reg, size, value);
 635
 636         return (result ? AE_ERROR : AE_OK);
 637 }
 638
 639 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 640
 641 acpi_status
 642 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 643                                 acpi_integer value, u32 width)
 644 {
 645         int result, size;
 646
 647         switch (width) {
 648         case 8:
 649                 size = 1;
 650                 break;
 651         case 16:
 652                 size = 2;
 653                 break;
 654         case 32:
 655                 size = 4;
 656                 break;
 657         default:
 658                 return AE_ERROR;
 659         }
 660
 661         BUG_ON(!raw_pci_ops);
 662
 663         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 664                                     PCI_DEVFN(pci_id->device, pci_id->function),
 665                                     reg, size, value);
 666
 667         return (result ? AE_ERROR : AE_OK);
 668 }
 669
 670 /* TODO: Change code to take advantage of driver model more */
 671 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 672                                     acpi_handle chandle,        /* current node */
 673                                     struct acpi_pci_id **id,
 674                                     int *is_bridge, u8 * bus_number)
 675 {
 676         acpi_handle handle;
 677         struct acpi_pci_id *pci_id = *id;
 678         acpi_status status;
 679         unsigned long temp;
 680         acpi_object_type type;
 681         u8 tu8;
 682
 683         acpi_get_parent(chandle, &handle);
 684         if (handle != rhandle) {
 685                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 686                                         bus_number);
 687
 688                 status = acpi_get_type(handle, &type);
 689                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 690                         return;
 691
 692                 status =
 693                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 694                                           &temp);
 695                 if (ACPI_SUCCESS(status)) {
 696                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 697                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 698
 699                         if (*is_bridge)
 700                                 pci_id->bus = *bus_number;
 701
 702                         /* any nicer way to get bus number of bridge ? */
 703                         status =
 704                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 705                                                            8);
 706                         if (ACPI_SUCCESS(status)
 707                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 708                                 status =
 709                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 710                                                                    &tu8, 8);
 711                                 if (!ACPI_SUCCESS(status)) {
 712                                         /* Certainly broken...  FIX ME */
 713                                         return;
 714                                 }
 715                                 *is_bridge = 1;
 716                                 pci_id->bus = tu8;
 717                                 status =
 718                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 719                                                                    &tu8, 8);
 720                                 if (ACPI_SUCCESS(status)) {
 721                                         *bus_number = tu8;
 722                                 }
 723                         } else
 724                                 *is_bridge = 0;
 725                 }
 726         }
 727 }
 728
 729 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 730                            acpi_handle chandle, /* current node */
 731                            struct acpi_pci_id **id)
 732 {
 733         int is_bridge = 1;
 734         u8 bus_number = (*id)->bus;
 735
 736         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 737 }
 738
 739 static void acpi_os_execute_deferred(struct work_struct *work)
 740 {
 741         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 742         if (!dpc) {
 743                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 744                 return;
 745         }
 746
 747         dpc->function(dpc->context);
 748         kfree(dpc);
 749
 750         /* Yield cpu to notify thread */
 751         cond_resched();
 752
 753         return;
 754 }
 755
 756 static void acpi_os_execute_notify(struct work_struct *work)
 757 {
 758         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 759
 760         if (!dpc) {
 761                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 762                 return;
 763         }
 764
 765         dpc->function(dpc->context);
 766
 767         kfree(dpc);
 768
 769         return;
 770 }
 771
 772 /*******************************************************************************
 773  *
 774  * FUNCTION:    acpi_os_execute
 775  *
 776  * PARAMETERS:  Type               - Type of the callback
 777  *              Function           - Function to be executed
 778  *              Context            - Function parameters
 779  *
 780  * RETURN:      Status
 781  *
 782  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 783  *              immediately executes function on a separate thread.
 784  *
 785  ******************************************************************************/
 786
 787 acpi_status acpi_os_execute(acpi_execute_type type,
 788                             acpi_osd_exec_callback function, void *context)
 789 {
 790         acpi_status status = AE_OK;
 791         struct acpi_os_dpc *dpc;
 792
 793         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 794                           "Scheduling function [%p(%p)] for deferred execution.\n",
 795                           function, context));
 796
 797         if (!function)
 798                 return AE_BAD_PARAMETER;
 799
 800         /*
 801          * Allocate/initialize DPC structure.  Note that this memory will be
 802          * freed by the callee.  The kernel handles the work_struct list  in a
 803          * way that allows us to also free its memory inside the callee.
 804          * Because we may want to schedule several tasks with different
 805          * parameters we can't use the approach some kernel code uses of
 806          * having a static work_struct.
 807          */
 808
 809         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 810         if (!dpc)
 811                 return_ACPI_STATUS(AE_NO_MEMORY);
 812
 813         dpc->function = function;
 814         dpc->context = context;
 815
 816         if (type == OSL_NOTIFY_HANDLER) {
 817                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 818                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 819                         status = AE_ERROR;
 820                         kfree(dpc);
 821                 }
 822         } else {
 823                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 824                 if (!queue_work(kacpid_wq, &dpc->work)) {
 825                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 826                                   "Call to queue_work() failed.\n"));
 827                         status = AE_ERROR;
 828                         kfree(dpc);
 829                 }
 830         }
 831         return_ACPI_STATUS(status);
 832 }
 833
 834 EXPORT_SYMBOL(acpi_os_execute);
 835
 836 void acpi_os_wait_events_complete(void *context)
 837 {
 838         flush_workqueue(kacpid_wq);
 839 }
 840
 841 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 842
 843 /*
 844  * Allocate the memory for a spinlock and initialize it.
 845  */
 846 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 847 {
 848         spin_lock_init(*handle);
 849
 850         return AE_OK;
 851 }
 852
 853 /*
 854  * Deallocate the memory for a spinlock.
 855  */
 856 void acpi_os_delete_lock(acpi_spinlock handle)
 857 {
 858         return;
 859 }
 860
 861 acpi_status
 862 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 863 {
 864         struct semaphore *sem = NULL;
 865
 866
 867         sem = acpi_os_allocate(sizeof(struct semaphore));
 868         if (!sem)
 869                 return AE_NO_MEMORY;
 870         memset(sem, 0, sizeof(struct semaphore));
 871
 872         sema_init(sem, initial_units);
 873
 874         *handle = (acpi_handle *) sem;
 875
 876         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 877                           *handle, initial_units));
 878
 879         return AE_OK;
 880 }
 881
 882 EXPORT_SYMBOL(acpi_os_create_semaphore);
 883
 884 /*
 885  * TODO: A better way to delete semaphores?  Linux doesn't have a
 886  * 'delete_semaphore()' function -- may result in an invalid
 887  * pointer dereference for non-synchronized consumers.  Should
 888  * we at least check for blocked threads and signal/cancel them?
 889  */
 890
 891 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 892 {
 893         struct semaphore *sem = (struct semaphore *)handle;
 894
 895
 896         if (!sem)
 897                 return AE_BAD_PARAMETER;
 898
 899         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 900
 901         kfree(sem);
 902         sem = NULL;
 903
 904         return AE_OK;
 905 }
 906
 907 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 908
 909 /*
 910  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 911  * improvise.  The process is to sleep for one scheduler quantum
 912  * until the semaphore becomes available.  Downside is that this
 913  * may result in starvation for timeout-based waits when there's
 914  * lots of semaphore activity.
 915  *
 916  * TODO: Support for units > 1?
 917  */
 918 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 919 {
 920         acpi_status status = AE_OK;
 921         struct semaphore *sem = (struct semaphore *)handle;
 922         int ret = 0;
 923
 924
 925         if (!sem || (units < 1))
 926                 return AE_BAD_PARAMETER;
 927
 928         if (units > 1)
 929                 return AE_SUPPORT;
 930
 931         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 932                           handle, units, timeout));
 933
 934         /*
 935          * This can be called during resume with interrupts off.
 936          * Like boot-time, we should be single threaded and will
 937          * always get the lock if we try -- timeout or not.
 938          * If this doesn't succeed, then we will oops courtesy of
 939          * might_sleep() in down().
 940          */
 941         if (!down_trylock(sem))
 942                 return AE_OK;
 943
 944         switch (timeout) {
 945                 /*
 946                  * No Wait:
 947                  * --------
 948                  * A zero timeout value indicates that we shouldn't wait - just
 949                  * acquire the semaphore if available otherwise return AE_TIME
 950                  * (a.k.a. 'would block').
 951                  */
 952         case 0:
 953                 if (down_trylock(sem))
 954                         status = AE_TIME;
 955                 break;
 956
 957                 /*
 958                  * Wait Indefinitely:
 959                  * ------------------
 960                  */
 961         case ACPI_WAIT_FOREVER:
 962                 down(sem);
 963                 break;
 964
 965                 /*
 966                  * Wait w/ Timeout:
 967                  * ----------------
 968                  */
 969         default:
 970                 // TODO: A better timeout algorithm?
 971                 {
 972                         int i = 0;
 973                         static const int quantum_ms = 1000 / HZ;
 974
 975                         ret = down_trylock(sem);
 976                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 977                                 schedule_timeout_interruptible(1);
 978                                 ret = down_trylock(sem);
 979                         }
 980
 981                         if (ret != 0)
 982                                 status = AE_TIME;
 983                 }
 984                 break;
 985         }
 986
 987         if (ACPI_FAILURE(status)) {
 988                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 989                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 990                                   handle, units, timeout,
 991                                   acpi_format_exception(status)));
 992         } else {
 993                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 994                                   "Acquired semaphore[%p|%d|%d]", handle,
 995                                   units, timeout));
 996         }
 997
 998         return status;
 999 }
1000
1001 EXPORT_SYMBOL(acpi_os_wait_semaphore);
1002
1003 /*
1004  * TODO: Support for units > 1?
1005  */
1006 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1007 {
1008         struct semaphore *sem = (struct semaphore *)handle;
1009
1010
1011         if (!sem || (units < 1))
1012                 return AE_BAD_PARAMETER;
1013
1014         if (units > 1)
1015                 return AE_SUPPORT;
1016
1017         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1018                           units));
1019
1020         up(sem);
1021
1022         return AE_OK;
1023 }
1024
1025 EXPORT_SYMBOL(acpi_os_signal_semaphore);
1026
1027 #ifdef ACPI_FUTURE_USAGE
1028 u32 acpi_os_get_line(char *buffer)
1029 {
1030
1031 #ifdef ENABLE_DEBUGGER
1032         if (acpi_in_debugger) {
1033                 u32 chars;
1034
1035                 kdb_read(buffer, sizeof(line_buf));
1036
1037                 /* remove the CR kdb includes */
1038                 chars = strlen(buffer) - 1;
1039                 buffer[chars] = '\0';
1040         }
1041 #endif
1042
1043         return 0;
1044 }
1045 #endif                          /*  ACPI_FUTURE_USAGE  */
1046
1047 acpi_status acpi_os_signal(u32 function, void *info)
1048 {
1049         switch (function) {
1050         case ACPI_SIGNAL_FATAL:
1051                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1052                 break;
1053         case ACPI_SIGNAL_BREAKPOINT:
1054                 /*
1055                  * AML Breakpoint
1056                  * ACPI spec. says to treat it as a NOP unless
1057                  * you are debugging.  So if/when we integrate
1058                  * AML debugger into the kernel debugger its
1059                  * hook will go here.  But until then it is
1060                  * not useful to print anything on breakpoints.
1061                  */
1062                 break;
1063         default:
1064                 break;
1065         }
1066
1067         return AE_OK;
1068 }
1069
1070 EXPORT_SYMBOL(acpi_os_signal);
1071
1072 static int __init acpi_os_name_setup(char *str)
1073 {
1074         char *p = acpi_os_name;
1075         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1076
1077         if (!str || !*str)
1078                 return 0;
1079
1080         for (; count-- && str && *str; str++) {
1081                 if (isalnum(*str) || *str == ' ' || *str == ':')
1082                         *p++ = *str;
1083                 else if (*str == '\'' || *str == '"')
1084                         continue;
1085                 else
1086                         break;
1087         }
1088         *p = 0;
1089
1090         return 1;
1091
1092 }
1093
1094 __setup("acpi_os_name=", acpi_os_name_setup);
1095
1096 static void __init set_osi_linux(unsigned int enable)
1097 {
1098         if (osi_linux.enable != enable) {
1099                 osi_linux.enable = enable;
1100                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1101                         enable ? "Add": "Delet");
1102         }
1103         return;
1104 }
1105
1106 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1107 {
1108         osi_linux.cmdline = 1;  /* cmdline set the default */
1109         set_osi_linux(enable);
1110
1111         return;
1112 }
1113
1114 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1115 {
1116         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1117
1118         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1119
1120         if (enable == -1)
1121                 return;
1122
1123         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1124
1125         set_osi_linux(enable);
1126
1127         return;
1128 }
1129
1130 /*
1131  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1132  *
1133  * empty string disables _OSI
1134  * string starting with '!' disables that string
1135  * otherwise string is added to list, augmenting built-in strings
1136  */
1137 static int __init acpi_osi_setup(char *str)
1138 {
1139         if (str == NULL || *str == '\0') {
1140                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1141                 acpi_gbl_create_osi_method = FALSE;
1142         } else if (!strcmp("!Linux", str)) {
1143                 acpi_cmdline_osi_linux(0);      /* !enable */
1144         } else if (*str == '!') {
1145                 if (acpi_osi_invalidate(++str) == AE_OK)
1146                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1147         } else if (!strcmp("Linux", str)) {
1148                 acpi_cmdline_osi_linux(1);      /* enable */
1149         } else if (*osi_additional_string == '\0') {
1150                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1151                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1152         }
1153
1154         return 1;
1155 }
1156
1157 __setup("acpi_osi=", acpi_osi_setup);
1158
1159 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1160 static int __init acpi_serialize_setup(char *str)
1161 {
1162         printk(KERN_INFO PREFIX "serialize enabled\n");
1163
1164         acpi_gbl_all_methods_serialized = TRUE;
1165
1166         return 1;
1167 }
1168
1169 __setup("acpi_serialize", acpi_serialize_setup);
1170
1171 /*
1172  * Wake and Run-Time GPES are expected to be separate.
1173  * We disable wake-GPEs at run-time to prevent spurious
1174  * interrupts.
1175  *
1176  * However, if a system exists that shares Wake and
1177  * Run-time events on the same GPE this flag is available
1178  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1179  */
1180 static int __init acpi_wake_gpes_always_on_setup(char *str)
1181 {
1182         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1183
1184         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1185
1186         return 1;
1187 }
1188
1189 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1190
1191 /*
1192  * Acquire a spinlock.
1193  *
1194  * handle is a pointer to the spinlock_t.
1195  */
1196
1197 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1198 {
1199         acpi_cpu_flags flags;
1200         spin_lock_irqsave(lockp, flags);
1201         return flags;
1202 }
1203
1204 /*
1205  * Release a spinlock. See above.
1206  */
1207
1208 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1209 {
1210         spin_unlock_irqrestore(lockp, flags);
1211 }
1212
1213 #ifndef ACPI_USE_LOCAL_CACHE
1214
1215 /*******************************************************************************
1216  *
1217  * FUNCTION:    acpi_os_create_cache
1218  *
1219  * PARAMETERS:  name      - Ascii name for the cache
1220  *              size      - Size of each cached object
1221  *              depth     - Maximum depth of the cache (in objects) <ignored>
1222  *              cache     - Where the new cache object is returned
1223  *
1224  * RETURN:      status
1225  *
1226  * DESCRIPTION: Create a cache object
1227  *
1228  ******************************************************************************/
1229
1230 acpi_status
1231 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1232 {
1233         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1234         if (*cache == NULL)
1235                 return AE_ERROR;
1236         else
1237                 return AE_OK;
1238 }
1239
1240 /*******************************************************************************
1241  *
1242  * FUNCTION:    acpi_os_purge_cache
1243  *
1244  * PARAMETERS:  Cache           - Handle to cache object
1245  *
1246  * RETURN:      Status
1247  *
1248  * DESCRIPTION: Free all objects within the requested cache.
1249  *
1250  ******************************************************************************/
1251
1252 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1253 {
1254         kmem_cache_shrink(cache);
1255         return (AE_OK);
1256 }
1257
1258 /*******************************************************************************
1259  *
1260  * FUNCTION:    acpi_os_delete_cache
1261  *
1262  * PARAMETERS:  Cache           - Handle to cache object
1263  *
1264  * RETURN:      Status
1265  *
1266  * DESCRIPTION: Free all objects within the requested cache and delete the
1267  *              cache object.
1268  *
1269  ******************************************************************************/
1270
1271 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1272 {
1273         kmem_cache_destroy(cache);
1274         return (AE_OK);
1275 }
1276
1277 /*******************************************************************************
1278  *
1279  * FUNCTION:    acpi_os_release_object
1280  *
1281  * PARAMETERS:  Cache       - Handle to cache object
1282  *              Object      - The object to be released
1283  *
1284  * RETURN:      None
1285  *
1286  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1287  *              the object is deleted.
1288  *
1289  ******************************************************************************/
1290
1291 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1292 {
1293         kmem_cache_free(cache, object);
1294         return (AE_OK);
1295 }
1296
1297 /**
1298  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1299  *
1300  *      Returns 0 on success
1301  */
1302 int acpi_dmi_dump(void)
1303 {
1304
1305         if (!dmi_available)
1306                 return -1;
1307
1308         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1309                 dmi_get_slot(DMI_SYS_VENDOR));
1310         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1311                 dmi_get_slot(DMI_PRODUCT_NAME));
1312         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1313                 dmi_get_slot(DMI_PRODUCT_VERSION));
1314         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1315                 dmi_get_slot(DMI_BOARD_NAME));
1316         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1317                 dmi_get_slot(DMI_BIOS_VENDOR));
1318         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1319                 dmi_get_slot(DMI_BIOS_DATE));
1320
1321         return 0;
1322 }
1323
1324
1325 /******************************************************************************
1326  *
1327  * FUNCTION:    acpi_os_validate_interface
1328  *
1329  * PARAMETERS:  interface           - Requested interface to be validated
1330  *
1331  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1332  *
1333  * DESCRIPTION: Match an interface string to the interfaces supported by the
1334  *              host. Strings originate from an AML call to the _OSI method.
1335  *
1336  *****************************************************************************/
1337
1338 acpi_status
1339 acpi_os_validate_interface (char *interface)
1340 {
1341         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1342                 return AE_OK;
1343         if (!strcmp("Linux", interface)) {
1344
1345                 printk(KERN_NOTICE PREFIX
1346                         "BIOS _OSI(Linux) query %s%s\n",
1347                         osi_linux.enable ? "honored" : "ignored",
1348                         osi_linux.cmdline ? " via cmdline" :
1349                         osi_linux.dmi ? " via DMI" : "");
1350
1351                 if (!osi_linux.dmi) {
1352                         if (acpi_dmi_dump())
1353                                 printk(KERN_NOTICE PREFIX
1354                                         "[please extract dmidecode output]\n");
1355                         printk(KERN_NOTICE PREFIX
1356                                 "Please send DMI info above to "
1357                                 "linux-acpi@vger.kernel.org\n");
1358                 }
1359                 if (!osi_linux.known && !osi_linux.cmdline) {
1360                         printk(KERN_NOTICE PREFIX
1361                                 "If \"acpi_osi=%sLinux\" works better, "
1362                                 "please notify linux-acpi@vger.kernel.org\n",
1363                                 osi_linux.enable ? "!" : "");
1364                 }
1365
1366                 if (osi_linux.enable)
1367                         return AE_OK;
1368         }
1369         return AE_SUPPORT;
1370 }
1371
1372 /******************************************************************************
1373  *
1374  * FUNCTION:    acpi_os_validate_address
1375  *
1376  * PARAMETERS:  space_id             - ACPI space ID
1377  *              address             - Physical address
1378  *              length              - Address length
1379  *
1380  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1381  *              should return AE_AML_ILLEGAL_ADDRESS.
1382  *
1383  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1384  *              the addresses accessed by AML operation regions.
1385  *
1386  *****************************************************************************/
1387
1388 acpi_status
1389 acpi_os_validate_address (
1390     u8                   space_id,
1391     acpi_physical_address   address,
1392     acpi_size               length)
1393 {
1394
1395     return AE_OK;
1396 }
1397
1398 #endif