git.oblomov.eu Git - linux-2.6/blob - 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  *
   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 /*
  81  * "Ode to _OSI(Linux)"
  82  *
  83  * osi_linux -- Control response to BIOS _OSI(Linux) query.
  84  *
  85  * As Linux evolves, the features that it supports change.
  86  * So an OSI string such as "Linux" is not specific enough
  87  * to be useful across multiple versions of Linux.  It
  88  * doesn't identify any particular feature, interface,
  89  * or even any particular version of Linux...
  90  *
  91  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
  92  * to a BIOS _OSI(Linux) query.  When
  93  * a reference mobile BIOS started using it, its use
  94  * started to spread to many vendor platforms.
  95  * As it is not supportable, we need to halt that spread.
  96  *
  97  * Today, most BIOS references to _OSI(Linux) are noise --
  98  * they have no functional effect and are just dead code
  99  * carried over from the reference BIOS.
 100  *
 101  * The next most common case is that _OSI(Linux) harms Linux,
 102  * usually by causing the BIOS to follow paths that are
 103  * not tested during Windows validation.
 104  *
 105  * Finally, there is a short list of platforms
 106  * where OSI(Linux) benefits Linux.
 107  *
 108  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
 109  * DMI is used to disable the dmesg warning about OSI(Linux)
 110  * on platforms where it is known to have no effect.
 111  * But a dmesg warning remains for systems where
 112  * we do not know if OSI(Linux) is good or bad for the system.
 113  * DMI is also used to enable OSI(Linux) for the machines
 114  * that are known to need it.
 115  *
 116  * BIOS writers should NOT query _OSI(Linux) on future systems.
 117  * It will be ignored by default, and to get Linux to
 118  * not ignore it will require a kernel source update to
 119  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
 120  */
 121 #define OSI_LINUX_ENABLE 0
 122
 123 static struct osi_linux {
 124         unsigned int    enable:1;
 125         unsigned int    dmi:1;
 126         unsigned int    cmdline:1;
 127         unsigned int    known:1;
 128 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
 129
 130 static void __init acpi_request_region (struct acpi_generic_address *addr,
 131         unsigned int length, char *desc)
 132 {
 133         struct resource *res;
 134
 135         if (!addr->address || !length)
 136                 return;
 137
 138         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 139                 res = request_region(addr->address, length, desc);
 140         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 141                 res = request_mem_region(addr->address, length, desc);
 142 }
 143
 144 static int __init acpi_reserve_resources(void)
 145 {
 146         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 147                 "ACPI PM1a_EVT_BLK");
 148
 149         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 150                 "ACPI PM1b_EVT_BLK");
 151
 152         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 153                 "ACPI PM1a_CNT_BLK");
 154
 155         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 156                 "ACPI PM1b_CNT_BLK");
 157
 158         if (acpi_gbl_FADT.pm_timer_length == 4)
 159                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 160
 161         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 162                 "ACPI PM2_CNT_BLK");
 163
 164         /* Length of GPE blocks must be a non-negative multiple of 2 */
 165
 166         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 167                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 168                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 169
 170         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 171                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 172                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 173
 174         return 0;
 175 }
 176 device_initcall(acpi_reserve_resources);
 177
 178 acpi_status __init acpi_os_initialize(void)
 179 {
 180         return AE_OK;
 181 }
 182
 183 acpi_status acpi_os_initialize1(void)
 184 {
 185         /*
 186          * Initialize PCI configuration space access, as we'll need to access
 187          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 188          */
 189         if (!raw_pci_ops) {
 190                 printk(KERN_ERR PREFIX
 191                        "Access to PCI configuration space unavailable\n");
 192                 return AE_NULL_ENTRY;
 193         }
 194         kacpid_wq = create_singlethread_workqueue("kacpid");
 195         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 196         BUG_ON(!kacpid_wq);
 197         BUG_ON(!kacpi_notify_wq);
 198         return AE_OK;
 199 }
 200
 201 acpi_status acpi_os_terminate(void)
 202 {
 203         if (acpi_irq_handler) {
 204                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 205                                                  acpi_irq_handler);
 206         }
 207
 208         destroy_workqueue(kacpid_wq);
 209         destroy_workqueue(kacpi_notify_wq);
 210
 211         return AE_OK;
 212 }
 213
 214 void acpi_os_printf(const char *fmt, ...)
 215 {
 216         va_list args;
 217         va_start(args, fmt);
 218         acpi_os_vprintf(fmt, args);
 219         va_end(args);
 220 }
 221
 222 EXPORT_SYMBOL(acpi_os_printf);
 223
 224 void acpi_os_vprintf(const char *fmt, va_list args)
 225 {
 226         static char buffer[512];
 227
 228         vsprintf(buffer, fmt, args);
 229
 230 #ifdef ENABLE_DEBUGGER
 231         if (acpi_in_debugger) {
 232                 kdb_printf("%s", buffer);
 233         } else {
 234                 printk("%s", buffer);
 235         }
 236 #else
 237         printk("%s", buffer);
 238 #endif
 239 }
 240
 241 acpi_physical_address __init acpi_os_get_root_pointer(void)
 242 {
 243         if (efi_enabled) {
 244                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 245                         return efi.acpi20;
 246                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 247                         return efi.acpi;
 248                 else {
 249                         printk(KERN_ERR PREFIX
 250                                "System description tables not found\n");
 251                         return 0;
 252                 }
 253         } else {
 254                 acpi_physical_address pa = 0;
 255
 256                 acpi_find_root_pointer(&pa);
 257                 return pa;
 258         }
 259 }
 260
 261 void __iomem *__init_refok
 262 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 263 {
 264         if (phys > ULONG_MAX) {
 265                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 266                 return NULL;
 267         }
 268         if (acpi_gbl_permanent_mmap)
 269                 /*
 270                 * ioremap checks to ensure this is in reserved space
 271                 */
 272                 return ioremap((unsigned long)phys, size);
 273         else
 274                 return __acpi_map_table((unsigned long)phys, size);
 275 }
 276 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 277
 278 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 279 {
 280         if (acpi_gbl_permanent_mmap) {
 281                 iounmap(virt);
 282         }
 283 }
 284 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 285
 286 #ifdef ACPI_FUTURE_USAGE
 287 acpi_status
 288 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 289 {
 290         if (!phys || !virt)
 291                 return AE_BAD_PARAMETER;
 292
 293         *phys = virt_to_phys(virt);
 294
 295         return AE_OK;
 296 }
 297 #endif
 298
 299 #define ACPI_MAX_OVERRIDE_LEN 100
 300
 301 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 302
 303 acpi_status
 304 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 305                             acpi_string * new_val)
 306 {
 307         if (!init_val || !new_val)
 308                 return AE_BAD_PARAMETER;
 309
 310         *new_val = NULL;
 311         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 312                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 313                        acpi_os_name);
 314                 *new_val = acpi_os_name;
 315         }
 316
 317         return AE_OK;
 318 }
 319
 320 acpi_status
 321 acpi_os_table_override(struct acpi_table_header * existing_table,
 322                        struct acpi_table_header ** new_table)
 323 {
 324         if (!existing_table || !new_table)
 325                 return AE_BAD_PARAMETER;
 326
 327 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 328         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 329                 *new_table = (struct acpi_table_header *)AmlCode;
 330         else
 331                 *new_table = NULL;
 332 #else
 333         *new_table = NULL;
 334 #endif
 335         return AE_OK;
 336 }
 337
 338 static irqreturn_t acpi_irq(int irq, void *dev_id)
 339 {
 340         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 341 }
 342
 343 acpi_status
 344 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 345                                   void *context)
 346 {
 347         unsigned int irq;
 348
 349         /*
 350          * Ignore the GSI from the core, and use the value in our copy of the
 351          * FADT. It may not be the same if an interrupt source override exists
 352          * for the SCI.
 353          */
 354         gsi = acpi_gbl_FADT.sci_interrupt;
 355         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 356                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 357                        gsi);
 358                 return AE_OK;
 359         }
 360
 361         acpi_irq_handler = handler;
 362         acpi_irq_context = context;
 363         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 364                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 365                 return AE_NOT_ACQUIRED;
 366         }
 367         acpi_irq_irq = irq;
 368
 369         return AE_OK;
 370 }
 371
 372 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 373 {
 374         if (irq) {
 375                 free_irq(irq, acpi_irq);
 376                 acpi_irq_handler = NULL;
 377                 acpi_irq_irq = 0;
 378         }
 379
 380         return AE_OK;
 381 }
 382
 383 /*
 384  * Running in interpreter thread context, safe to sleep
 385  */
 386
 387 void acpi_os_sleep(acpi_integer ms)
 388 {
 389         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 390 }
 391
 392 EXPORT_SYMBOL(acpi_os_sleep);
 393
 394 void acpi_os_stall(u32 us)
 395 {
 396         while (us) {
 397                 u32 delay = 1000;
 398
 399                 if (delay > us)
 400                         delay = us;
 401                 udelay(delay);
 402                 touch_nmi_watchdog();
 403                 us -= delay;
 404         }
 405 }
 406
 407 EXPORT_SYMBOL(acpi_os_stall);
 408
 409 /*
 410  * Support ACPI 3.0 AML Timer operand
 411  * Returns 64-bit free-running, monotonically increasing timer
 412  * with 100ns granularity
 413  */
 414 u64 acpi_os_get_timer(void)
 415 {
 416         static u64 t;
 417
 418 #ifdef  CONFIG_HPET
 419         /* TBD: use HPET if available */
 420 #endif
 421
 422 #ifdef  CONFIG_X86_PM_TIMER
 423         /* TBD: default to PM timer if HPET was not available */
 424 #endif
 425         if (!t)
 426                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 427
 428         return ++t;
 429 }
 430
 431 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 432 {
 433         u32 dummy;
 434
 435         if (!value)
 436                 value = &dummy;
 437
 438         *value = 0;
 439         if (width <= 8) {
 440                 *(u8 *) value = inb(port);
 441         } else if (width <= 16) {
 442                 *(u16 *) value = inw(port);
 443         } else if (width <= 32) {
 444                 *(u32 *) value = inl(port);
 445         } else {
 446                 BUG();
 447         }
 448
 449         return AE_OK;
 450 }
 451
 452 EXPORT_SYMBOL(acpi_os_read_port);
 453
 454 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 455 {
 456         if (width <= 8) {
 457                 outb(value, port);
 458         } else if (width <= 16) {
 459                 outw(value, port);
 460         } else if (width <= 32) {
 461                 outl(value, port);
 462         } else {
 463                 BUG();
 464         }
 465
 466         return AE_OK;
 467 }
 468
 469 EXPORT_SYMBOL(acpi_os_write_port);
 470
 471 acpi_status
 472 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 473 {
 474         u32 dummy;
 475         void __iomem *virt_addr;
 476
 477         virt_addr = ioremap(phys_addr, width);
 478         if (!value)
 479                 value = &dummy;
 480
 481         switch (width) {
 482         case 8:
 483                 *(u8 *) value = readb(virt_addr);
 484                 break;
 485         case 16:
 486                 *(u16 *) value = readw(virt_addr);
 487                 break;
 488         case 32:
 489                 *(u32 *) value = readl(virt_addr);
 490                 break;
 491         default:
 492                 BUG();
 493         }
 494
 495         iounmap(virt_addr);
 496
 497         return AE_OK;
 498 }
 499
 500 acpi_status
 501 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 502 {
 503         void __iomem *virt_addr;
 504
 505         virt_addr = ioremap(phys_addr, width);
 506
 507         switch (width) {
 508         case 8:
 509                 writeb(value, virt_addr);
 510                 break;
 511         case 16:
 512                 writew(value, virt_addr);
 513                 break;
 514         case 32:
 515                 writel(value, virt_addr);
 516                 break;
 517         default:
 518                 BUG();
 519         }
 520
 521         iounmap(virt_addr);
 522
 523         return AE_OK;
 524 }
 525
 526 acpi_status
 527 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 528                                void *value, u32 width)
 529 {
 530         int result, size;
 531
 532         if (!value)
 533                 return AE_BAD_PARAMETER;
 534
 535         switch (width) {
 536         case 8:
 537                 size = 1;
 538                 break;
 539         case 16:
 540                 size = 2;
 541                 break;
 542         case 32:
 543                 size = 4;
 544                 break;
 545         default:
 546                 return AE_ERROR;
 547         }
 548
 549         BUG_ON(!raw_pci_ops);
 550
 551         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 552                                    PCI_DEVFN(pci_id->device, pci_id->function),
 553                                    reg, size, value);
 554
 555         return (result ? AE_ERROR : AE_OK);
 556 }
 557
 558 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 559
 560 acpi_status
 561 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 562                                 acpi_integer value, u32 width)
 563 {
 564         int result, size;
 565
 566         switch (width) {
 567         case 8:
 568                 size = 1;
 569                 break;
 570         case 16:
 571                 size = 2;
 572                 break;
 573         case 32:
 574                 size = 4;
 575                 break;
 576         default:
 577                 return AE_ERROR;
 578         }
 579
 580         BUG_ON(!raw_pci_ops);
 581
 582         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 583                                     PCI_DEVFN(pci_id->device, pci_id->function),
 584                                     reg, size, value);
 585
 586         return (result ? AE_ERROR : AE_OK);
 587 }
 588
 589 /* TODO: Change code to take advantage of driver model more */
 590 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 591                                     acpi_handle chandle,        /* current node */
 592                                     struct acpi_pci_id **id,
 593                                     int *is_bridge, u8 * bus_number)
 594 {
 595         acpi_handle handle;
 596         struct acpi_pci_id *pci_id = *id;
 597         acpi_status status;
 598         unsigned long temp;
 599         acpi_object_type type;
 600         u8 tu8;
 601
 602         acpi_get_parent(chandle, &handle);
 603         if (handle != rhandle) {
 604                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 605                                         bus_number);
 606
 607                 status = acpi_get_type(handle, &type);
 608                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 609                         return;
 610
 611                 status =
 612                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 613                                           &temp);
 614                 if (ACPI_SUCCESS(status)) {
 615                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 616                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 617
 618                         if (*is_bridge)
 619                                 pci_id->bus = *bus_number;
 620
 621                         /* any nicer way to get bus number of bridge ? */
 622                         status =
 623                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 624                                                            8);
 625                         if (ACPI_SUCCESS(status)
 626                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 627                                 status =
 628                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 629                                                                    &tu8, 8);
 630                                 if (!ACPI_SUCCESS(status)) {
 631                                         /* Certainly broken...  FIX ME */
 632                                         return;
 633                                 }
 634                                 *is_bridge = 1;
 635                                 pci_id->bus = tu8;
 636                                 status =
 637                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 638                                                                    &tu8, 8);
 639                                 if (ACPI_SUCCESS(status)) {
 640                                         *bus_number = tu8;
 641                                 }
 642                         } else
 643                                 *is_bridge = 0;
 644                 }
 645         }
 646 }
 647
 648 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 649                            acpi_handle chandle, /* current node */
 650                            struct acpi_pci_id **id)
 651 {
 652         int is_bridge = 1;
 653         u8 bus_number = (*id)->bus;
 654
 655         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 656 }
 657
 658 static void acpi_os_execute_deferred(struct work_struct *work)
 659 {
 660         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 661         if (!dpc) {
 662                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 663                 return;
 664         }
 665
 666         dpc->function(dpc->context);
 667         kfree(dpc);
 668
 669         return;
 670 }
 671
 672 /*******************************************************************************
 673  *
 674  * FUNCTION:    acpi_os_execute
 675  *
 676  * PARAMETERS:  Type               - Type of the callback
 677  *              Function           - Function to be executed
 678  *              Context            - Function parameters
 679  *
 680  * RETURN:      Status
 681  *
 682  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 683  *              immediately executes function on a separate thread.
 684  *
 685  ******************************************************************************/
 686
 687 acpi_status acpi_os_execute(acpi_execute_type type,
 688                             acpi_osd_exec_callback function, void *context)
 689 {
 690         acpi_status status = AE_OK;
 691         struct acpi_os_dpc *dpc;
 692         struct workqueue_struct *queue;
 693         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 694                           "Scheduling function [%p(%p)] for deferred execution.\n",
 695                           function, context));
 696
 697         if (!function)
 698                 return AE_BAD_PARAMETER;
 699
 700         /*
 701          * Allocate/initialize DPC structure.  Note that this memory will be
 702          * freed by the callee.  The kernel handles the work_struct list  in a
 703          * way that allows us to also free its memory inside the callee.
 704          * Because we may want to schedule several tasks with different
 705          * parameters we can't use the approach some kernel code uses of
 706          * having a static work_struct.
 707          */
 708
 709         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 710         if (!dpc)
 711                 return_ACPI_STATUS(AE_NO_MEMORY);
 712
 713         dpc->function = function;
 714         dpc->context = context;
 715
 716         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 717         queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
 718         if (!queue_work(queue, &dpc->work)) {
 719                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 720                           "Call to queue_work() failed.\n"));
 721                 status = AE_ERROR;
 722                 kfree(dpc);
 723         }
 724         return_ACPI_STATUS(status);
 725 }
 726
 727 EXPORT_SYMBOL(acpi_os_execute);
 728
 729 void acpi_os_wait_events_complete(void *context)
 730 {
 731         flush_workqueue(kacpid_wq);
 732 }
 733
 734 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 735
 736 /*
 737  * Allocate the memory for a spinlock and initialize it.
 738  */
 739 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 740 {
 741         spin_lock_init(*handle);
 742
 743         return AE_OK;
 744 }
 745
 746 /*
 747  * Deallocate the memory for a spinlock.
 748  */
 749 void acpi_os_delete_lock(acpi_spinlock handle)
 750 {
 751         return;
 752 }
 753
 754 acpi_status
 755 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 756 {
 757         struct semaphore *sem = NULL;
 758
 759
 760         sem = acpi_os_allocate(sizeof(struct semaphore));
 761         if (!sem)
 762                 return AE_NO_MEMORY;
 763         memset(sem, 0, sizeof(struct semaphore));
 764
 765         sema_init(sem, initial_units);
 766
 767         *handle = (acpi_handle *) sem;
 768
 769         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 770                           *handle, initial_units));
 771
 772         return AE_OK;
 773 }
 774
 775 EXPORT_SYMBOL(acpi_os_create_semaphore);
 776
 777 /*
 778  * TODO: A better way to delete semaphores?  Linux doesn't have a
 779  * 'delete_semaphore()' function -- may result in an invalid
 780  * pointer dereference for non-synchronized consumers.  Should
 781  * we at least check for blocked threads and signal/cancel them?
 782  */
 783
 784 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 785 {
 786         struct semaphore *sem = (struct semaphore *)handle;
 787
 788
 789         if (!sem)
 790                 return AE_BAD_PARAMETER;
 791
 792         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 793
 794         kfree(sem);
 795         sem = NULL;
 796
 797         return AE_OK;
 798 }
 799
 800 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 801
 802 /*
 803  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 804  * improvise.  The process is to sleep for one scheduler quantum
 805  * until the semaphore becomes available.  Downside is that this
 806  * may result in starvation for timeout-based waits when there's
 807  * lots of semaphore activity.
 808  *
 809  * TODO: Support for units > 1?
 810  */
 811 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 812 {
 813         acpi_status status = AE_OK;
 814         struct semaphore *sem = (struct semaphore *)handle;
 815         int ret = 0;
 816
 817
 818         if (!sem || (units < 1))
 819                 return AE_BAD_PARAMETER;
 820
 821         if (units > 1)
 822                 return AE_SUPPORT;
 823
 824         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 825                           handle, units, timeout));
 826
 827         /*
 828          * This can be called during resume with interrupts off.
 829          * Like boot-time, we should be single threaded and will
 830          * always get the lock if we try -- timeout or not.
 831          * If this doesn't succeed, then we will oops courtesy of
 832          * might_sleep() in down().
 833          */
 834         if (!down_trylock(sem))
 835                 return AE_OK;
 836
 837         switch (timeout) {
 838                 /*
 839                  * No Wait:
 840                  * --------
 841                  * A zero timeout value indicates that we shouldn't wait - just
 842                  * acquire the semaphore if available otherwise return AE_TIME
 843                  * (a.k.a. 'would block').
 844                  */
 845         case 0:
 846                 if (down_trylock(sem))
 847                         status = AE_TIME;
 848                 break;
 849
 850                 /*
 851                  * Wait Indefinitely:
 852                  * ------------------
 853                  */
 854         case ACPI_WAIT_FOREVER:
 855                 down(sem);
 856                 break;
 857
 858                 /*
 859                  * Wait w/ Timeout:
 860                  * ----------------
 861                  */
 862         default:
 863                 // TODO: A better timeout algorithm?
 864                 {
 865                         int i = 0;
 866                         static const int quantum_ms = 1000 / HZ;
 867
 868                         ret = down_trylock(sem);
 869                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 870                                 schedule_timeout_interruptible(1);
 871                                 ret = down_trylock(sem);
 872                         }
 873
 874                         if (ret != 0)
 875                                 status = AE_TIME;
 876                 }
 877                 break;
 878         }
 879
 880         if (ACPI_FAILURE(status)) {
 881                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 882                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 883                                   handle, units, timeout,
 884                                   acpi_format_exception(status)));
 885         } else {
 886                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 887                                   "Acquired semaphore[%p|%d|%d]", handle,
 888                                   units, timeout));
 889         }
 890
 891         return status;
 892 }
 893
 894 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 895
 896 /*
 897  * TODO: Support for units > 1?
 898  */
 899 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 900 {
 901         struct semaphore *sem = (struct semaphore *)handle;
 902
 903
 904         if (!sem || (units < 1))
 905                 return AE_BAD_PARAMETER;
 906
 907         if (units > 1)
 908                 return AE_SUPPORT;
 909
 910         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 911                           units));
 912
 913         up(sem);
 914
 915         return AE_OK;
 916 }
 917
 918 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 919
 920 #ifdef ACPI_FUTURE_USAGE
 921 u32 acpi_os_get_line(char *buffer)
 922 {
 923
 924 #ifdef ENABLE_DEBUGGER
 925         if (acpi_in_debugger) {
 926                 u32 chars;
 927
 928                 kdb_read(buffer, sizeof(line_buf));
 929
 930                 /* remove the CR kdb includes */
 931                 chars = strlen(buffer) - 1;
 932                 buffer[chars] = '\0';
 933         }
 934 #endif
 935
 936         return 0;
 937 }
 938 #endif                          /*  ACPI_FUTURE_USAGE  */
 939
 940 acpi_status acpi_os_signal(u32 function, void *info)
 941 {
 942         switch (function) {
 943         case ACPI_SIGNAL_FATAL:
 944                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 945                 break;
 946         case ACPI_SIGNAL_BREAKPOINT:
 947                 /*
 948                  * AML Breakpoint
 949                  * ACPI spec. says to treat it as a NOP unless
 950                  * you are debugging.  So if/when we integrate
 951                  * AML debugger into the kernel debugger its
 952                  * hook will go here.  But until then it is
 953                  * not useful to print anything on breakpoints.
 954                  */
 955                 break;
 956         default:
 957                 break;
 958         }
 959
 960         return AE_OK;
 961 }
 962
 963 EXPORT_SYMBOL(acpi_os_signal);
 964
 965 static int __init acpi_os_name_setup(char *str)
 966 {
 967         char *p = acpi_os_name;
 968         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 969
 970         if (!str || !*str)
 971                 return 0;
 972
 973         for (; count-- && str && *str; str++) {
 974                 if (isalnum(*str) || *str == ' ' || *str == ':')
 975                         *p++ = *str;
 976                 else if (*str == '\'' || *str == '"')
 977                         continue;
 978                 else
 979                         break;
 980         }
 981         *p = 0;
 982
 983         return 1;
 984
 985 }
 986
 987 __setup("acpi_os_name=", acpi_os_name_setup);
 988
 989 static void __init set_osi_linux(unsigned int enable)
 990 {
 991         if (osi_linux.enable != enable) {
 992                 osi_linux.enable = enable;
 993                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
 994                         enable ? "Add": "Delet");
 995         }
 996         return;
 997 }
 998
 999 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1000 {
1001         osi_linux.cmdline = 1;  /* cmdline set the default */
1002         set_osi_linux(enable);
1003
1004         return;
1005 }
1006
1007 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1008 {
1009         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1010
1011         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1012
1013         if (enable == -1)
1014                 return;
1015
1016         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1017
1018         set_osi_linux(enable);
1019
1020         return;
1021 }
1022
1023 /*
1024  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1025  *
1026  * empty string disables _OSI
1027  * string starting with '!' disables that string
1028  * otherwise string is added to list, augmenting built-in strings
1029  */
1030 static int __init acpi_osi_setup(char *str)
1031 {
1032         if (str == NULL || *str == '\0') {
1033                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1034                 acpi_gbl_create_osi_method = FALSE;
1035         } else if (!strcmp("!Linux", str)) {
1036                 acpi_cmdline_osi_linux(0);      /* !enable */
1037         } else if (*str == '!') {
1038                 if (acpi_osi_invalidate(++str) == AE_OK)
1039                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1040         } else if (!strcmp("Linux", str)) {
1041                 acpi_cmdline_osi_linux(1);      /* enable */
1042         } else if (*osi_additional_string == '\0') {
1043                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1044                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1045         }
1046
1047         return 1;
1048 }
1049
1050 __setup("acpi_osi=", acpi_osi_setup);
1051
1052 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1053 static int __init acpi_serialize_setup(char *str)
1054 {
1055         printk(KERN_INFO PREFIX "serialize enabled\n");
1056
1057         acpi_gbl_all_methods_serialized = TRUE;
1058
1059         return 1;
1060 }
1061
1062 __setup("acpi_serialize", acpi_serialize_setup);
1063
1064 /*
1065  * Wake and Run-Time GPES are expected to be separate.
1066  * We disable wake-GPEs at run-time to prevent spurious
1067  * interrupts.
1068  *
1069  * However, if a system exists that shares Wake and
1070  * Run-time events on the same GPE this flag is available
1071  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1072  */
1073 static int __init acpi_wake_gpes_always_on_setup(char *str)
1074 {
1075         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1076
1077         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1078
1079         return 1;
1080 }
1081
1082 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1083
1084 /*
1085  * Acquire a spinlock.
1086  *
1087  * handle is a pointer to the spinlock_t.
1088  */
1089
1090 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1091 {
1092         acpi_cpu_flags flags;
1093         spin_lock_irqsave(lockp, flags);
1094         return flags;
1095 }
1096
1097 /*
1098  * Release a spinlock. See above.
1099  */
1100
1101 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1102 {
1103         spin_unlock_irqrestore(lockp, flags);
1104 }
1105
1106 #ifndef ACPI_USE_LOCAL_CACHE
1107
1108 /*******************************************************************************
1109  *
1110  * FUNCTION:    acpi_os_create_cache
1111  *
1112  * PARAMETERS:  name      - Ascii name for the cache
1113  *              size      - Size of each cached object
1114  *              depth     - Maximum depth of the cache (in objects) <ignored>
1115  *              cache     - Where the new cache object is returned
1116  *
1117  * RETURN:      status
1118  *
1119  * DESCRIPTION: Create a cache object
1120  *
1121  ******************************************************************************/
1122
1123 acpi_status
1124 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1125 {
1126         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1127         if (*cache == NULL)
1128                 return AE_ERROR;
1129         else
1130                 return AE_OK;
1131 }
1132
1133 /*******************************************************************************
1134  *
1135  * FUNCTION:    acpi_os_purge_cache
1136  *
1137  * PARAMETERS:  Cache           - Handle to cache object
1138  *
1139  * RETURN:      Status
1140  *
1141  * DESCRIPTION: Free all objects within the requested cache.
1142  *
1143  ******************************************************************************/
1144
1145 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1146 {
1147         kmem_cache_shrink(cache);
1148         return (AE_OK);
1149 }
1150
1151 /*******************************************************************************
1152  *
1153  * FUNCTION:    acpi_os_delete_cache
1154  *
1155  * PARAMETERS:  Cache           - Handle to cache object
1156  *
1157  * RETURN:      Status
1158  *
1159  * DESCRIPTION: Free all objects within the requested cache and delete the
1160  *              cache object.
1161  *
1162  ******************************************************************************/
1163
1164 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1165 {
1166         kmem_cache_destroy(cache);
1167         return (AE_OK);
1168 }
1169
1170 /*******************************************************************************
1171  *
1172  * FUNCTION:    acpi_os_release_object
1173  *
1174  * PARAMETERS:  Cache       - Handle to cache object
1175  *              Object      - The object to be released
1176  *
1177  * RETURN:      None
1178  *
1179  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1180  *              the object is deleted.
1181  *
1182  ******************************************************************************/
1183
1184 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1185 {
1186         kmem_cache_free(cache, object);
1187         return (AE_OK);
1188 }
1189
1190 /**
1191  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1192  *
1193  *      Returns 0 on success
1194  */
1195 static int acpi_dmi_dump(void)
1196 {
1197
1198         if (!dmi_available)
1199                 return -1;
1200
1201         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1202                 dmi_get_system_info(DMI_SYS_VENDOR));
1203         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1204                 dmi_get_system_info(DMI_PRODUCT_NAME));
1205         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1206                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1207         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1208                 dmi_get_system_info(DMI_BOARD_NAME));
1209         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1210                 dmi_get_system_info(DMI_BIOS_VENDOR));
1211         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1212                 dmi_get_system_info(DMI_BIOS_DATE));
1213
1214         return 0;
1215 }
1216
1217
1218 /******************************************************************************
1219  *
1220  * FUNCTION:    acpi_os_validate_interface
1221  *
1222  * PARAMETERS:  interface           - Requested interface to be validated
1223  *
1224  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1225  *
1226  * DESCRIPTION: Match an interface string to the interfaces supported by the
1227  *              host. Strings originate from an AML call to the _OSI method.
1228  *
1229  *****************************************************************************/
1230
1231 acpi_status
1232 acpi_os_validate_interface (char *interface)
1233 {
1234         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1235                 return AE_OK;
1236         if (!strcmp("Linux", interface)) {
1237
1238                 printk(KERN_NOTICE PREFIX
1239                         "BIOS _OSI(Linux) query %s%s\n",
1240                         osi_linux.enable ? "honored" : "ignored",
1241                         osi_linux.cmdline ? " via cmdline" :
1242                         osi_linux.dmi ? " via DMI" : "");
1243
1244                 if (!osi_linux.dmi) {
1245                         if (acpi_dmi_dump())
1246                                 printk(KERN_NOTICE PREFIX
1247                                         "[please extract dmidecode output]\n");
1248                         printk(KERN_NOTICE PREFIX
1249                                 "Please send DMI info above to "
1250                                 "linux-acpi@vger.kernel.org\n");
1251                 }
1252                 if (!osi_linux.known && !osi_linux.cmdline) {
1253                         printk(KERN_NOTICE PREFIX
1254                                 "If \"acpi_osi=%sLinux\" works better, "
1255                                 "please notify linux-acpi@vger.kernel.org\n",
1256                                 osi_linux.enable ? "!" : "");
1257                 }
1258
1259                 if (osi_linux.enable)
1260                         return AE_OK;
1261         }
1262         return AE_SUPPORT;
1263 }
1264
1265 /******************************************************************************
1266  *
1267  * FUNCTION:    acpi_os_validate_address
1268  *
1269  * PARAMETERS:  space_id             - ACPI space ID
1270  *              address             - Physical address
1271  *              length              - Address length
1272  *
1273  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1274  *              should return AE_AML_ILLEGAL_ADDRESS.
1275  *
1276  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1277  *              the addresses accessed by AML operation regions.
1278  *
1279  *****************************************************************************/
1280
1281 acpi_status
1282 acpi_os_validate_address (
1283     u8                   space_id,
1284     acpi_physical_address   address,
1285     acpi_size               length)
1286 {
1287
1288     return AE_OK;
1289 }
1290
1291 #endif