tools/power/acpi/os_specific/service_layers/osunixxf.c

   1 /******************************************************************************
   2  *
   3  * Module Name: osunixxf - UNIX OSL interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 /*
  45  * These interfaces are required in order to compile the ASL compiler and the
  46  * various ACPICA tools under Linux or other Unix-like system.
  47  */
  48 #include <acpi/acpi.h>
  49 #include "accommon.h"
  50 #include "amlcode.h"
  51 #include "acparser.h"
  52 #include "acdebug.h"
  53
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <stdarg.h>
  57 #include <unistd.h>
  58 #include <sys/time.h>
  59 #include <semaphore.h>
  60 #include <pthread.h>
  61 #include <errno.h>
  62
  63 #define _COMPONENT          ACPI_OS_SERVICES
  64 ACPI_MODULE_NAME("osunixxf")
  65
  66 /* Upcalls to acpi_exec */
  67 void
  68 ae_table_override(struct acpi_table_header *existing_table,
  69                   struct acpi_table_header **new_table);
  70
  71 typedef void *(*PTHREAD_CALLBACK) (void *);
  72
  73 /* Buffer used by acpi_os_vprintf */
  74
  75 #define ACPI_VPRINTF_BUFFER_SIZE    512
  76 #define _ASCII_NEWLINE              '\n'
  77
  78 /* Terminal support for acpi_exec only */
  79
  80 #ifdef ACPI_EXEC_APP
  81 #include <termios.h>
  82
  83 struct termios original_term_attributes;
  84 int term_attributes_were_set = 0;
  85
  86 acpi_status acpi_ut_read_line(char *buffer, u32 buffer_length, u32 *bytes_read);
  87
  88 static void os_enter_line_edit_mode(void);
  89
  90 static void os_exit_line_edit_mode(void);
  91
  92 /******************************************************************************
  93  *
  94  * FUNCTION:    os_enter_line_edit_mode, os_exit_line_edit_mode
  95  *
  96  * PARAMETERS:  None
  97  *
  98  * RETURN:      None
  99  *
 100  * DESCRIPTION: Enter/Exit the raw character input mode for the terminal.
 101  *
 102  * Interactive line-editing support for the AML debugger. Used with the
 103  * common/acgetline module.
 104  *
 105  * readline() is not used because of non-portability. It is not available
 106  * on all systems, and if it is, often the package must be manually installed.
 107  *
 108  * Therefore, we use the POSIX tcgetattr/tcsetattr and do the minimal line
 109  * editing that we need in acpi_os_get_line.
 110  *
 111  * If the POSIX tcgetattr/tcsetattr interfaces are unavailable, these
 112  * calls will also work:
 113  *     For os_enter_line_edit_mode: system ("stty cbreak -echo")
 114  *     For os_exit_line_edit_mode: system ("stty cooked echo")
 115  *
 116  *****************************************************************************/
 117
 118 static void os_enter_line_edit_mode(void)
 119 {
 120         struct termios local_term_attributes;
 121
 122         term_attributes_were_set = 0;
 123
 124         /* STDIN must be a terminal */
 125
 126         if (!isatty(STDIN_FILENO)) {
 127                 return;
 128         }
 129
 130         /* Get and keep the original attributes */
 131
 132         if (tcgetattr(STDIN_FILENO, &original_term_attributes)) {
 133                 fprintf(stderr, "Could not get terminal attributes!\n");
 134                 return;
 135         }
 136
 137         /* Set the new attributes to enable raw character input */
 138
 139         memcpy(&local_term_attributes, &original_term_attributes,
 140                sizeof(struct termios));
 141
 142         local_term_attributes.c_lflag &= ~(ICANON | ECHO);
 143         local_term_attributes.c_cc[VMIN] = 1;
 144         local_term_attributes.c_cc[VTIME] = 0;
 145
 146         if (tcsetattr(STDIN_FILENO, TCSANOW, &local_term_attributes)) {
 147                 fprintf(stderr, "Could not set terminal attributes!\n");
 148                 return;
 149         }
 150
 151         term_attributes_were_set = 1;
 152 }
 153
 154 static void os_exit_line_edit_mode(void)
 155 {
 156
 157         if (!term_attributes_were_set) {
 158                 return;
 159         }
 160
 161         /* Set terminal attributes back to the original values */
 162
 163         if (tcsetattr(STDIN_FILENO, TCSANOW, &original_term_attributes)) {
 164                 fprintf(stderr, "Could not restore terminal attributes!\n");
 165         }
 166 }
 167
 168 #else
 169
 170 /* These functions are not needed for other ACPICA utilities */
 171
 172 #define os_enter_line_edit_mode()
 173 #define os_exit_line_edit_mode()
 174 #endif
 175
 176 /******************************************************************************
 177  *
 178  * FUNCTION:    acpi_os_initialize, acpi_os_terminate
 179  *
 180  * PARAMETERS:  None
 181  *
 182  * RETURN:      Status
 183  *
 184  * DESCRIPTION: Initialize and terminate this module.
 185  *
 186  *****************************************************************************/
 187
 188 acpi_status acpi_os_initialize(void)
 189 {
 190         acpi_status status;
 191
 192         acpi_gbl_output_file = stdout;
 193
 194         os_enter_line_edit_mode();
 195
 196         status = acpi_os_create_lock(&acpi_gbl_print_lock);
 197         if (ACPI_FAILURE(status)) {
 198                 return (status);
 199         }
 200
 201         return (AE_OK);
 202 }
 203
 204 acpi_status acpi_os_terminate(void)
 205 {
 206
 207         os_exit_line_edit_mode();
 208         return (AE_OK);
 209 }
 210
 211 #ifndef ACPI_USE_NATIVE_RSDP_POINTER
 212 /******************************************************************************
 213  *
 214  * FUNCTION:    acpi_os_get_root_pointer
 215  *
 216  * PARAMETERS:  None
 217  *
 218  * RETURN:      RSDP physical address
 219  *
 220  * DESCRIPTION: Gets the ACPI root pointer (RSDP)
 221  *
 222  *****************************************************************************/
 223
 224 acpi_physical_address acpi_os_get_root_pointer(void)
 225 {
 226
 227         return (0);
 228 }
 229 #endif
 230
 231 /******************************************************************************
 232  *
 233  * FUNCTION:    acpi_os_predefined_override
 234  *
 235  * PARAMETERS:  init_val            - Initial value of the predefined object
 236  *              new_val             - The new value for the object
 237  *
 238  * RETURN:      Status, pointer to value. Null pointer returned if not
 239  *              overriding.
 240  *
 241  * DESCRIPTION: Allow the OS to override predefined names
 242  *
 243  *****************************************************************************/
 244
 245 acpi_status
 246 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 247                             acpi_string *new_val)
 248 {
 249
 250         if (!init_val || !new_val) {
 251                 return (AE_BAD_PARAMETER);
 252         }
 253
 254         *new_val = NULL;
 255         return (AE_OK);
 256 }
 257
 258 /******************************************************************************
 259  *
 260  * FUNCTION:    acpi_os_table_override
 261  *
 262  * PARAMETERS:  existing_table      - Header of current table (probably
 263  *                                    firmware)
 264  *              new_table           - Where an entire new table is returned.
 265  *
 266  * RETURN:      Status, pointer to new table. Null pointer returned if no
 267  *              table is available to override
 268  *
 269  * DESCRIPTION: Return a different version of a table if one is available
 270  *
 271  *****************************************************************************/
 272
 273 acpi_status
 274 acpi_os_table_override(struct acpi_table_header *existing_table,
 275                        struct acpi_table_header **new_table)
 276 {
 277
 278         if (!existing_table || !new_table) {
 279                 return (AE_BAD_PARAMETER);
 280         }
 281
 282         *new_table = NULL;
 283
 284 #ifdef ACPI_EXEC_APP
 285
 286         ae_table_override(existing_table, new_table);
 287         return (AE_OK);
 288 #else
 289
 290         return (AE_NO_ACPI_TABLES);
 291 #endif
 292 }
 293
 294 /******************************************************************************
 295  *
 296  * FUNCTION:    acpi_os_physical_table_override
 297  *
 298  * PARAMETERS:  existing_table      - Header of current table (probably firmware)
 299  *              new_address         - Where new table address is returned
 300  *                                    (Physical address)
 301  *              new_table_length    - Where new table length is returned
 302  *
 303  * RETURN:      Status, address/length of new table. Null pointer returned
 304  *              if no table is available to override.
 305  *
 306  * DESCRIPTION: Returns AE_SUPPORT, function not used in user space.
 307  *
 308  *****************************************************************************/
 309
 310 acpi_status
 311 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 312                                 acpi_physical_address *new_address,
 313                                 u32 *new_table_length)
 314 {
 315
 316         return (AE_SUPPORT);
 317 }
 318
 319 /******************************************************************************
 320  *
 321  * FUNCTION:    acpi_os_redirect_output
 322  *
 323  * PARAMETERS:  destination         - An open file handle/pointer
 324  *
 325  * RETURN:      None
 326  *
 327  * DESCRIPTION: Causes redirect of acpi_os_printf and acpi_os_vprintf
 328  *
 329  *****************************************************************************/
 330
 331 void acpi_os_redirect_output(void *destination)
 332 {
 333
 334         acpi_gbl_output_file = destination;
 335 }
 336
 337 /******************************************************************************
 338  *
 339  * FUNCTION:    acpi_os_printf
 340  *
 341  * PARAMETERS:  fmt, ...            - Standard printf format
 342  *
 343  * RETURN:      None
 344  *
 345  * DESCRIPTION: Formatted output. Note: very similar to acpi_os_vprintf
 346  *              (performance), changes should be tracked in both functions.
 347  *
 348  *****************************************************************************/
 349
 350 void ACPI_INTERNAL_VAR_XFACE acpi_os_printf(const char *fmt, ...)
 351 {
 352         va_list args;
 353         u8 flags;
 354
 355         flags = acpi_gbl_db_output_flags;
 356         if (flags & ACPI_DB_REDIRECTABLE_OUTPUT) {
 357
 358                 /* Output is directable to either a file (if open) or the console */
 359
 360                 if (acpi_gbl_debug_file) {
 361
 362                         /* Output file is open, send the output there */
 363
 364                         va_start(args, fmt);
 365                         vfprintf(acpi_gbl_debug_file, fmt, args);
 366                         va_end(args);
 367                 } else {
 368                         /* No redirection, send output to console (once only!) */
 369
 370                         flags |= ACPI_DB_CONSOLE_OUTPUT;
 371                 }
 372         }
 373
 374         if (flags & ACPI_DB_CONSOLE_OUTPUT) {
 375                 va_start(args, fmt);
 376                 vfprintf(acpi_gbl_output_file, fmt, args);
 377                 va_end(args);
 378         }
 379 }
 380
 381 /******************************************************************************
 382  *
 383  * FUNCTION:    acpi_os_vprintf
 384  *
 385  * PARAMETERS:  fmt                 - Standard printf format
 386  *              args                - Argument list
 387  *
 388  * RETURN:      None
 389  *
 390  * DESCRIPTION: Formatted output with argument list pointer. Note: very
 391  *              similar to acpi_os_printf, changes should be tracked in both
 392  *              functions.
 393  *
 394  *****************************************************************************/
 395
 396 void acpi_os_vprintf(const char *fmt, va_list args)
 397 {
 398         u8 flags;
 399         char buffer[ACPI_VPRINTF_BUFFER_SIZE];
 400
 401         /*
 402          * We build the output string in a local buffer because we may be
 403          * outputting the buffer twice. Using vfprintf is problematic because
 404          * some implementations modify the args pointer/structure during
 405          * execution. Thus, we use the local buffer for portability.
 406          *
 407          * Note: Since this module is intended for use by the various ACPICA
 408          * utilities/applications, we can safely declare the buffer on the stack.
 409          * Also, This function is used for relatively small error messages only.
 410          */
 411         vsnprintf(buffer, ACPI_VPRINTF_BUFFER_SIZE, fmt, args);
 412
 413         flags = acpi_gbl_db_output_flags;
 414         if (flags & ACPI_DB_REDIRECTABLE_OUTPUT) {
 415
 416                 /* Output is directable to either a file (if open) or the console */
 417
 418                 if (acpi_gbl_debug_file) {
 419
 420                         /* Output file is open, send the output there */
 421
 422                         fputs(buffer, acpi_gbl_debug_file);
 423                 } else {
 424                         /* No redirection, send output to console (once only!) */
 425
 426                         flags |= ACPI_DB_CONSOLE_OUTPUT;
 427                 }
 428         }
 429
 430         if (flags & ACPI_DB_CONSOLE_OUTPUT) {
 431                 fputs(buffer, acpi_gbl_output_file);
 432         }
 433 }
 434
 435 #ifndef ACPI_EXEC_APP
 436 /******************************************************************************
 437  *
 438  * FUNCTION:    acpi_os_get_line
 439  *
 440  * PARAMETERS:  buffer              - Where to return the command line
 441  *              buffer_length       - Maximum length of Buffer
 442  *              bytes_read          - Where the actual byte count is returned
 443  *
 444  * RETURN:      Status and actual bytes read
 445  *
 446  * DESCRIPTION: Get the next input line from the terminal. NOTE: For the
 447  *              acpi_exec utility, we use the acgetline module instead to
 448  *              provide line-editing and history support.
 449  *
 450  *****************************************************************************/
 451
 452 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
 453 {
 454         int input_char;
 455         u32 end_of_line;
 456
 457         /* Standard acpi_os_get_line for all utilities except acpi_exec */
 458
 459         for (end_of_line = 0;; end_of_line++) {
 460                 if (end_of_line >= buffer_length) {
 461                         return (AE_BUFFER_OVERFLOW);
 462                 }
 463
 464                 if ((input_char = getchar()) == EOF) {
 465                         return (AE_ERROR);
 466                 }
 467
 468                 if (!input_char || input_char == _ASCII_NEWLINE) {
 469                         break;
 470                 }
 471
 472                 buffer[end_of_line] = (char)input_char;
 473         }
 474
 475         /* Null terminate the buffer */
 476
 477         buffer[end_of_line] = 0;
 478
 479         /* Return the number of bytes in the string */
 480
 481         if (bytes_read) {
 482                 *bytes_read = end_of_line;
 483         }
 484
 485         return (AE_OK);
 486 }
 487 #endif
 488
 489 #ifndef ACPI_USE_NATIVE_MEMORY_MAPPING
 490 /******************************************************************************
 491  *
 492  * FUNCTION:    acpi_os_map_memory
 493  *
 494  * PARAMETERS:  where               - Physical address of memory to be mapped
 495  *              length              - How much memory to map
 496  *
 497  * RETURN:      Pointer to mapped memory. Null on error.
 498  *
 499  * DESCRIPTION: Map physical memory into caller's address space
 500  *
 501  *****************************************************************************/
 502
 503 void *acpi_os_map_memory(acpi_physical_address where, acpi_size length)
 504 {
 505
 506         return (ACPI_TO_POINTER((acpi_size)where));
 507 }
 508
 509 /******************************************************************************
 510  *
 511  * FUNCTION:    acpi_os_unmap_memory
 512  *
 513  * PARAMETERS:  where               - Logical address of memory to be unmapped
 514  *              length              - How much memory to unmap
 515  *
 516  * RETURN:      None.
 517  *
 518  * DESCRIPTION: Delete a previously created mapping. Where and Length must
 519  *              correspond to a previous mapping exactly.
 520  *
 521  *****************************************************************************/
 522
 523 void acpi_os_unmap_memory(void *where, acpi_size length)
 524 {
 525
 526         return;
 527 }
 528 #endif
 529
 530 /******************************************************************************
 531  *
 532  * FUNCTION:    acpi_os_allocate
 533  *
 534  * PARAMETERS:  size                - Amount to allocate, in bytes
 535  *
 536  * RETURN:      Pointer to the new allocation. Null on error.
 537  *
 538  * DESCRIPTION: Allocate memory. Algorithm is dependent on the OS.
 539  *
 540  *****************************************************************************/
 541
 542 void *acpi_os_allocate(acpi_size size)
 543 {
 544         void *mem;
 545
 546         mem = (void *)malloc((size_t) size);
 547         return (mem);
 548 }
 549
 550 #ifdef USE_NATIVE_ALLOCATE_ZEROED
 551 /******************************************************************************
 552  *
 553  * FUNCTION:    acpi_os_allocate_zeroed
 554  *
 555  * PARAMETERS:  size                - Amount to allocate, in bytes
 556  *
 557  * RETURN:      Pointer to the new allocation. Null on error.
 558  *
 559  * DESCRIPTION: Allocate and zero memory. Algorithm is dependent on the OS.
 560  *
 561  *****************************************************************************/
 562
 563 void *acpi_os_allocate_zeroed(acpi_size size)
 564 {
 565         void *mem;
 566
 567         mem = (void *)calloc(1, (size_t) size);
 568         return (mem);
 569 }
 570 #endif
 571
 572 /******************************************************************************
 573  *
 574  * FUNCTION:    acpi_os_free
 575  *
 576  * PARAMETERS:  mem                 - Pointer to previously allocated memory
 577  *
 578  * RETURN:      None.
 579  *
 580  * DESCRIPTION: Free memory allocated via acpi_os_allocate
 581  *
 582  *****************************************************************************/
 583
 584 void acpi_os_free(void *mem)
 585 {
 586
 587         free(mem);
 588 }
 589
 590 #ifdef ACPI_SINGLE_THREADED
 591 /******************************************************************************
 592  *
 593  * FUNCTION:    Semaphore stub functions
 594  *
 595  * DESCRIPTION: Stub functions used for single-thread applications that do
 596  *              not require semaphore synchronization. Full implementations
 597  *              of these functions appear after the stubs.
 598  *
 599  *****************************************************************************/
 600
 601 acpi_status
 602 acpi_os_create_semaphore(u32 max_units,
 603                          u32 initial_units, acpi_handle *out_handle)
 604 {
 605         *out_handle = (acpi_handle)1;
 606         return (AE_OK);
 607 }
 608
 609 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 610 {
 611         return (AE_OK);
 612 }
 613
 614 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 615 {
 616         return (AE_OK);
 617 }
 618
 619 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 620 {
 621         return (AE_OK);
 622 }
 623
 624 #else
 625 /******************************************************************************
 626  *
 627  * FUNCTION:    acpi_os_create_semaphore
 628  *
 629  * PARAMETERS:  initial_units       - Units to be assigned to the new semaphore
 630  *              out_handle          - Where a handle will be returned
 631  *
 632  * RETURN:      Status
 633  *
 634  * DESCRIPTION: Create an OS semaphore
 635  *
 636  *****************************************************************************/
 637
 638 acpi_status
 639 acpi_os_create_semaphore(u32 max_units,
 640                          u32 initial_units, acpi_handle *out_handle)
 641 {
 642         sem_t *sem;
 643
 644         if (!out_handle) {
 645                 return (AE_BAD_PARAMETER);
 646         }
 647 #ifdef __APPLE__
 648         {
 649                 static int semaphore_count = 0;
 650                 char semaphore_name[32];
 651
 652                 snprintf(semaphore_name, sizeof(semaphore_name), "acpi_sem_%d",
 653                          semaphore_count++);
 654                 printf("%s\n", semaphore_name);
 655                 sem =
 656                     sem_open(semaphore_name, O_EXCL | O_CREAT, 0755,
 657                              initial_units);
 658                 if (!sem) {
 659                         return (AE_NO_MEMORY);
 660                 }
 661                 sem_unlink(semaphore_name);     /* This just deletes the name */
 662         }
 663
 664 #else
 665         sem = acpi_os_allocate(sizeof(sem_t));
 666         if (!sem) {
 667                 return (AE_NO_MEMORY);
 668         }
 669
 670         if (sem_init(sem, 0, initial_units) == -1) {
 671                 acpi_os_free(sem);
 672                 return (AE_BAD_PARAMETER);
 673         }
 674 #endif
 675
 676         *out_handle = (acpi_handle)sem;
 677         return (AE_OK);
 678 }
 679
 680 /******************************************************************************
 681  *
 682  * FUNCTION:    acpi_os_delete_semaphore
 683  *
 684  * PARAMETERS:  handle              - Handle returned by acpi_os_create_semaphore
 685  *
 686  * RETURN:      Status
 687  *
 688  * DESCRIPTION: Delete an OS semaphore
 689  *
 690  *****************************************************************************/
 691
 692 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 693 {
 694         sem_t *sem = (sem_t *) handle;
 695
 696         if (!sem) {
 697                 return (AE_BAD_PARAMETER);
 698         }
 699 #ifdef __APPLE__
 700         if (sem_close(sem) == -1) {
 701                 return (AE_BAD_PARAMETER);
 702         }
 703 #else
 704         if (sem_destroy(sem) == -1) {
 705                 return (AE_BAD_PARAMETER);
 706         }
 707 #endif
 708
 709         return (AE_OK);
 710 }
 711
 712 /******************************************************************************
 713  *
 714  * FUNCTION:    acpi_os_wait_semaphore
 715  *
 716  * PARAMETERS:  handle              - Handle returned by acpi_os_create_semaphore
 717  *              units               - How many units to wait for
 718  *              msec_timeout        - How long to wait (milliseconds)
 719  *
 720  * RETURN:      Status
 721  *
 722  * DESCRIPTION: Wait for units
 723  *
 724  *****************************************************************************/
 725
 726 acpi_status
 727 acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 msec_timeout)
 728 {
 729         acpi_status status = AE_OK;
 730         sem_t *sem = (sem_t *) handle;
 731 #ifndef ACPI_USE_ALTERNATE_TIMEOUT
 732         struct timespec time;
 733         int ret_val;
 734 #endif
 735
 736         if (!sem) {
 737                 return (AE_BAD_PARAMETER);
 738         }
 739
 740         switch (msec_timeout) {
 741                 /*
 742                  * No Wait:
 743                  * --------
 744                  * A zero timeout value indicates that we shouldn't wait - just
 745                  * acquire the semaphore if available otherwise return AE_TIME
 746                  * (a.k.a. 'would block').
 747                  */
 748         case 0:
 749
 750                 if (sem_trywait(sem) == -1) {
 751                         status = (AE_TIME);
 752                 }
 753                 break;
 754
 755                 /* Wait Indefinitely */
 756
 757         case ACPI_WAIT_FOREVER:
 758
 759                 if (sem_wait(sem)) {
 760                         status = (AE_TIME);
 761                 }
 762                 break;
 763
 764                 /* Wait with msec_timeout */
 765
 766         default:
 767
 768 #ifdef ACPI_USE_ALTERNATE_TIMEOUT
 769                 /*
 770                  * Alternate timeout mechanism for environments where
 771                  * sem_timedwait is not available or does not work properly.
 772                  */
 773                 while (msec_timeout) {
 774                         if (sem_trywait(sem) == 0) {
 775
 776                                 /* Got the semaphore */
 777                                 return (AE_OK);
 778                         }
 779
 780                         if (msec_timeout >= 10) {
 781                                 msec_timeout -= 10;
 782                                 usleep(10 * ACPI_USEC_PER_MSEC);        /* ten milliseconds */
 783                         } else {
 784                                 msec_timeout--;
 785                                 usleep(ACPI_USEC_PER_MSEC);     /* one millisecond */
 786                         }
 787                 }
 788                 status = (AE_TIME);
 789 #else
 790                 /*
 791                  * The interface to sem_timedwait is an absolute time, so we need to
 792                  * get the current time, then add in the millisecond Timeout value.
 793                  */
 794                 if (clock_gettime(CLOCK_REALTIME, &time) == -1) {
 795                         perror("clock_gettime");
 796                         return (AE_TIME);
 797                 }
 798
 799                 time.tv_sec += (msec_timeout / ACPI_MSEC_PER_SEC);
 800                 time.tv_nsec +=
 801                     ((msec_timeout % ACPI_MSEC_PER_SEC) * ACPI_NSEC_PER_MSEC);
 802
 803                 /* Handle nanosecond overflow (field must be less than one second) */
 804
 805                 if (time.tv_nsec >= ACPI_NSEC_PER_SEC) {
 806                         time.tv_sec += (time.tv_nsec / ACPI_NSEC_PER_SEC);
 807                         time.tv_nsec = (time.tv_nsec % ACPI_NSEC_PER_SEC);
 808                 }
 809
 810                 while (((ret_val = sem_timedwait(sem, &time)) == -1)
 811                        && (errno == EINTR)) {
 812                         continue;
 813                 }
 814
 815                 if (ret_val != 0) {
 816                         if (errno != ETIMEDOUT) {
 817                                 perror("sem_timedwait");
 818                         }
 819                         status = (AE_TIME);
 820                 }
 821 #endif
 822                 break;
 823         }
 824
 825         return (status);
 826 }
 827
 828 /******************************************************************************
 829  *
 830  * FUNCTION:    acpi_os_signal_semaphore
 831  *
 832  * PARAMETERS:  handle              - Handle returned by acpi_os_create_semaphore
 833  *              units               - Number of units to send
 834  *
 835  * RETURN:      Status
 836  *
 837  * DESCRIPTION: Send units
 838  *
 839  *****************************************************************************/
 840
 841 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 842 {
 843         sem_t *sem = (sem_t *) handle;
 844
 845         if (!sem) {
 846                 return (AE_BAD_PARAMETER);
 847         }
 848
 849         if (sem_post(sem) == -1) {
 850                 return (AE_LIMIT);
 851         }
 852
 853         return (AE_OK);
 854 }
 855
 856 #endif                          /* ACPI_SINGLE_THREADED */
 857
 858 /******************************************************************************
 859  *
 860  * FUNCTION:    Spinlock interfaces
 861  *
 862  * DESCRIPTION: Map these interfaces to semaphore interfaces
 863  *
 864  *****************************************************************************/
 865
 866 acpi_status acpi_os_create_lock(acpi_spinlock * out_handle)
 867 {
 868
 869         return (acpi_os_create_semaphore(1, 1, out_handle));
 870 }
 871
 872 void acpi_os_delete_lock(acpi_spinlock handle)
 873 {
 874         acpi_os_delete_semaphore(handle);
 875 }
 876
 877 acpi_cpu_flags acpi_os_acquire_lock(acpi_handle handle)
 878 {
 879         acpi_os_wait_semaphore(handle, 1, 0xFFFF);
 880         return (0);
 881 }
 882
 883 void acpi_os_release_lock(acpi_spinlock handle, acpi_cpu_flags flags)
 884 {
 885         acpi_os_signal_semaphore(handle, 1);
 886 }
 887
 888 /******************************************************************************
 889  *
 890  * FUNCTION:    acpi_os_install_interrupt_handler
 891  *
 892  * PARAMETERS:  interrupt_number    - Level handler should respond to.
 893  *              isr                 - Address of the ACPI interrupt handler
 894  *              except_ptr          - Where status is returned
 895  *
 896  * RETURN:      Handle to the newly installed handler.
 897  *
 898  * DESCRIPTION: Install an interrupt handler. Used to install the ACPI
 899  *              OS-independent handler.
 900  *
 901  *****************************************************************************/
 902
 903 u32
 904 acpi_os_install_interrupt_handler(u32 interrupt_number,
 905                                   acpi_osd_handler service_routine,
 906                                   void *context)
 907 {
 908
 909         return (AE_OK);
 910 }
 911
 912 /******************************************************************************
 913  *
 914  * FUNCTION:    acpi_os_remove_interrupt_handler
 915  *
 916  * PARAMETERS:  handle              - Returned when handler was installed
 917  *
 918  * RETURN:      Status
 919  *
 920  * DESCRIPTION: Uninstalls an interrupt handler.
 921  *
 922  *****************************************************************************/
 923
 924 acpi_status
 925 acpi_os_remove_interrupt_handler(u32 interrupt_number,
 926                                  acpi_osd_handler service_routine)
 927 {
 928
 929         return (AE_OK);
 930 }
 931
 932 /******************************************************************************
 933  *
 934  * FUNCTION:    acpi_os_stall
 935  *
 936  * PARAMETERS:  microseconds        - Time to sleep
 937  *
 938  * RETURN:      Blocks until sleep is completed.
 939  *
 940  * DESCRIPTION: Sleep at microsecond granularity
 941  *
 942  *****************************************************************************/
 943
 944 void acpi_os_stall(u32 microseconds)
 945 {
 946
 947         if (microseconds) {
 948                 usleep(microseconds);
 949         }
 950 }
 951
 952 /******************************************************************************
 953  *
 954  * FUNCTION:    acpi_os_sleep
 955  *
 956  * PARAMETERS:  milliseconds        - Time to sleep
 957  *
 958  * RETURN:      Blocks until sleep is completed.
 959  *
 960  * DESCRIPTION: Sleep at millisecond granularity
 961  *
 962  *****************************************************************************/
 963
 964 void acpi_os_sleep(u64 milliseconds)
 965 {
 966
 967         /* Sleep for whole seconds */
 968
 969         sleep(milliseconds / ACPI_MSEC_PER_SEC);
 970
 971         /*
 972          * Sleep for remaining microseconds.
 973          * Arg to usleep() is in usecs and must be less than 1,000,000 (1 second).
 974          */
 975         usleep((milliseconds % ACPI_MSEC_PER_SEC) * ACPI_USEC_PER_MSEC);
 976 }
 977
 978 /******************************************************************************
 979  *
 980  * FUNCTION:    acpi_os_get_timer
 981  *
 982  * PARAMETERS:  None
 983  *
 984  * RETURN:      Current time in 100 nanosecond units
 985  *
 986  * DESCRIPTION: Get the current system time
 987  *
 988  *****************************************************************************/
 989
 990 u64 acpi_os_get_timer(void)
 991 {
 992         struct timeval time;
 993
 994         /* This timer has sufficient resolution for user-space application code */
 995
 996         gettimeofday(&time, NULL);
 997
 998         /* (Seconds * 10^7 = 100ns(10^-7)) + (Microseconds(10^-6) * 10^1 = 100ns) */
 999
1000         return (((u64)time.tv_sec * ACPI_100NSEC_PER_SEC) +
1001                 ((u64)time.tv_usec * ACPI_100NSEC_PER_USEC));
1002 }
1003
1004 /******************************************************************************
1005  *
1006  * FUNCTION:    acpi_os_read_pci_configuration
1007  *
1008  * PARAMETERS:  pci_id              - Seg/Bus/Dev
1009  *              pci_register        - Device Register
1010  *              value               - Buffer where value is placed
1011  *              width               - Number of bits
1012  *
1013  * RETURN:      Status
1014  *
1015  * DESCRIPTION: Read data from PCI configuration space
1016  *
1017  *****************************************************************************/
1018
1019 acpi_status
1020 acpi_os_read_pci_configuration(struct acpi_pci_id *pci_id,
1021                                u32 pci_register, u64 *value, u32 width)
1022 {
1023
1024         *value = 0;
1025         return (AE_OK);
1026 }
1027
1028 /******************************************************************************
1029  *
1030  * FUNCTION:    acpi_os_write_pci_configuration
1031  *
1032  * PARAMETERS:  pci_id              - Seg/Bus/Dev
1033  *              pci_register        - Device Register
1034  *              value               - Value to be written
1035  *              width               - Number of bits
1036  *
1037  * RETURN:      Status.
1038  *
1039  * DESCRIPTION: Write data to PCI configuration space
1040  *
1041  *****************************************************************************/
1042
1043 acpi_status
1044 acpi_os_write_pci_configuration(struct acpi_pci_id *pci_id,
1045                                 u32 pci_register, u64 value, u32 width)
1046 {
1047
1048         return (AE_OK);
1049 }
1050
1051 /******************************************************************************
1052  *
1053  * FUNCTION:    acpi_os_read_port
1054  *
1055  * PARAMETERS:  address             - Address of I/O port/register to read
1056  *              value               - Where value is placed
1057  *              width               - Number of bits
1058  *
1059  * RETURN:      Value read from port
1060  *
1061  * DESCRIPTION: Read data from an I/O port or register
1062  *
1063  *****************************************************************************/
1064
1065 acpi_status acpi_os_read_port(acpi_io_address address, u32 *value, u32 width)
1066 {
1067
1068         switch (width) {
1069         case 8:
1070
1071                 *value = 0xFF;
1072                 break;
1073
1074         case 16:
1075
1076                 *value = 0xFFFF;
1077                 break;
1078
1079         case 32:
1080
1081                 *value = 0xFFFFFFFF;
1082                 break;
1083
1084         default:
1085
1086                 return (AE_BAD_PARAMETER);
1087         }
1088
1089         return (AE_OK);
1090 }
1091
1092 /******************************************************************************
1093  *
1094  * FUNCTION:    acpi_os_write_port
1095  *
1096  * PARAMETERS:  address             - Address of I/O port/register to write
1097  *              value               - Value to write
1098  *              width               - Number of bits
1099  *
1100  * RETURN:      None
1101  *
1102  * DESCRIPTION: Write data to an I/O port or register
1103  *
1104  *****************************************************************************/
1105
1106 acpi_status acpi_os_write_port(acpi_io_address address, u32 value, u32 width)
1107 {
1108
1109         return (AE_OK);
1110 }
1111
1112 /******************************************************************************
1113  *
1114  * FUNCTION:    acpi_os_read_memory
1115  *
1116  * PARAMETERS:  address             - Physical Memory Address to read
1117  *              value               - Where value is placed
1118  *              width               - Number of bits (8,16,32, or 64)
1119  *
1120  * RETURN:      Value read from physical memory address. Always returned
1121  *              as a 64-bit integer, regardless of the read width.
1122  *
1123  * DESCRIPTION: Read data from a physical memory address
1124  *
1125  *****************************************************************************/
1126
1127 acpi_status
1128 acpi_os_read_memory(acpi_physical_address address, u64 *value, u32 width)
1129 {
1130
1131         switch (width) {
1132         case 8:
1133         case 16:
1134         case 32:
1135         case 64:
1136
1137                 *value = 0;
1138                 break;
1139
1140         default:
1141
1142                 return (AE_BAD_PARAMETER);
1143         }
1144         return (AE_OK);
1145 }
1146
1147 /******************************************************************************
1148  *
1149  * FUNCTION:    acpi_os_write_memory
1150  *
1151  * PARAMETERS:  address             - Physical Memory Address to write
1152  *              value               - Value to write
1153  *              width               - Number of bits (8,16,32, or 64)
1154  *
1155  * RETURN:      None
1156  *
1157  * DESCRIPTION: Write data to a physical memory address
1158  *
1159  *****************************************************************************/
1160
1161 acpi_status
1162 acpi_os_write_memory(acpi_physical_address address, u64 value, u32 width)
1163 {
1164
1165         return (AE_OK);
1166 }
1167
1168 /******************************************************************************
1169  *
1170  * FUNCTION:    acpi_os_readable
1171  *
1172  * PARAMETERS:  pointer             - Area to be verified
1173  *              length              - Size of area
1174  *
1175  * RETURN:      TRUE if readable for entire length
1176  *
1177  * DESCRIPTION: Verify that a pointer is valid for reading
1178  *
1179  *****************************************************************************/
1180
1181 u8 acpi_os_readable(void *pointer, acpi_size length)
1182 {
1183
1184         return (TRUE);
1185 }
1186
1187 /******************************************************************************
1188  *
1189  * FUNCTION:    acpi_os_writable
1190  *
1191  * PARAMETERS:  pointer             - Area to be verified
1192  *              length              - Size of area
1193  *
1194  * RETURN:      TRUE if writable for entire length
1195  *
1196  * DESCRIPTION: Verify that a pointer is valid for writing
1197  *
1198  *****************************************************************************/
1199
1200 u8 acpi_os_writable(void *pointer, acpi_size length)
1201 {
1202
1203         return (TRUE);
1204 }
1205
1206 /******************************************************************************
1207  *
1208  * FUNCTION:    acpi_os_signal
1209  *
1210  * PARAMETERS:  function            - ACPI A signal function code
1211  *              info                - Pointer to function-dependent structure
1212  *
1213  * RETURN:      Status
1214  *
1215  * DESCRIPTION: Miscellaneous functions. Example implementation only.
1216  *
1217  *****************************************************************************/
1218
1219 acpi_status acpi_os_signal(u32 function, void *info)
1220 {
1221
1222         switch (function) {
1223         case ACPI_SIGNAL_FATAL:
1224
1225                 break;
1226
1227         case ACPI_SIGNAL_BREAKPOINT:
1228
1229                 break;
1230
1231         default:
1232
1233                 break;
1234         }
1235
1236         return (AE_OK);
1237 }
1238
1239 /* Optional multi-thread support */
1240
1241 #ifndef ACPI_SINGLE_THREADED
1242 /******************************************************************************
1243  *
1244  * FUNCTION:    acpi_os_get_thread_id
1245  *
1246  * PARAMETERS:  None
1247  *
1248  * RETURN:      Id of the running thread
1249  *
1250  * DESCRIPTION: Get the ID of the current (running) thread
1251  *
1252  *****************************************************************************/
1253
1254 acpi_thread_id acpi_os_get_thread_id(void)
1255 {
1256         pthread_t thread;
1257
1258         thread = pthread_self();
1259         return (ACPI_CAST_PTHREAD_T(thread));
1260 }
1261
1262 /******************************************************************************
1263  *
1264  * FUNCTION:    acpi_os_execute
1265  *
1266  * PARAMETERS:  type                - Type of execution
1267  *              function            - Address of the function to execute
1268  *              context             - Passed as a parameter to the function
1269  *
1270  * RETURN:      Status.
1271  *
1272  * DESCRIPTION: Execute a new thread
1273  *
1274  *****************************************************************************/
1275
1276 acpi_status
1277 acpi_os_execute(acpi_execute_type type,
1278                 acpi_osd_exec_callback function, void *context)
1279 {
1280         pthread_t thread;
1281         int ret;
1282
1283         ret =
1284             pthread_create(&thread, NULL, (PTHREAD_CALLBACK) function, context);
1285         if (ret) {
1286                 acpi_os_printf("Create thread failed");
1287         }
1288         return (0);
1289 }
1290
1291 #else                           /* ACPI_SINGLE_THREADED */
1292 acpi_thread_id acpi_os_get_thread_id(void)
1293 {
1294         return (1);
1295 }
1296
1297 acpi_status
1298 acpi_os_execute(acpi_execute_type type,
1299                 acpi_osd_exec_callback function, void *context)
1300 {
1301
1302         function(context);
1303
1304         return (AE_OK);
1305 }
1306
1307 #endif                          /* ACPI_SINGLE_THREADED */
1308
1309 /******************************************************************************
1310  *
1311  * FUNCTION:    acpi_os_wait_events_complete
1312  *
1313  * PARAMETERS:  None
1314  *
1315  * RETURN:      None
1316  *
1317  * DESCRIPTION: Wait for all asynchronous events to complete. This
1318  *              implementation does nothing.
1319  *
1320  *****************************************************************************/
1321
1322 void acpi_os_wait_events_complete(void)
1323 {
1324         return;
1325 }