drivers/acpi/acpica/exutils.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exutils - interpreter/scanner utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, 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  * DEFINE_AML_GLOBALS is tested in amlcode.h
  46  * to determine whether certain global names should be "defined" or only
  47  * "declared" in the current compilation.  This enhances maintainability
  48  * by enabling a single header file to embody all knowledge of the names
  49  * in question.
  50  *
  51  * Exactly one module of any executable should #define DEFINE_GLOBALS
  52  * before #including the header files which use this convention.  The
  53  * names in question will be defined and initialized in that module,
  54  * and declared as extern in all other modules which #include those
  55  * header files.
  56  */
  57
  58 #define DEFINE_AML_GLOBALS
  59
  60 #include <acpi/acpi.h>
  61 #include "accommon.h"
  62 #include "acinterp.h"
  63 #include "amlcode.h"
  64
  65 #define _COMPONENT          ACPI_EXECUTER
  66 ACPI_MODULE_NAME("exutils")
  67
  68 /* Local prototypes */
  69 static u32 acpi_ex_digits_needed(u64 value, u32 base);
  70
  71 #ifndef ACPI_NO_METHOD_EXECUTION
  72 /*******************************************************************************
  73  *
  74  * FUNCTION:    acpi_ex_enter_interpreter
  75  *
  76  * PARAMETERS:  None
  77  *
  78  * RETURN:      None
  79  *
  80  * DESCRIPTION: Enter the interpreter execution region. Failure to enter
  81  *              the interpreter region is a fatal system error. Used in
  82  *              conjunction with exit_interpreter.
  83  *
  84  ******************************************************************************/
  85
  86 void acpi_ex_enter_interpreter(void)
  87 {
  88         acpi_status status;
  89
  90         ACPI_FUNCTION_TRACE(ex_enter_interpreter);
  91
  92         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
  93         if (ACPI_FAILURE(status)) {
  94                 ACPI_ERROR((AE_INFO,
  95                             "Could not acquire AML Interpreter mutex"));
  96         }
  97
  98         return_VOID;
  99 }
 100
 101 /*******************************************************************************
 102  *
 103  * FUNCTION:    acpi_ex_reacquire_interpreter
 104  *
 105  * PARAMETERS:  None
 106  *
 107  * RETURN:      None
 108  *
 109  * DESCRIPTION: Reacquire the interpreter execution region from within the
 110  *              interpreter code. Failure to enter the interpreter region is a
 111  *              fatal system error. Used in conjunction with
 112  *              relinquish_interpreter
 113  *
 114  ******************************************************************************/
 115
 116 void acpi_ex_reacquire_interpreter(void)
 117 {
 118         ACPI_FUNCTION_TRACE(ex_reacquire_interpreter);
 119
 120         /*
 121          * If the global serialized flag is set, do not release the interpreter,
 122          * since it was not actually released by acpi_ex_relinquish_interpreter.
 123          * This forces the interpreter to be single threaded.
 124          */
 125         if (!acpi_gbl_all_methods_serialized) {
 126                 acpi_ex_enter_interpreter();
 127         }
 128
 129         return_VOID;
 130 }
 131
 132 /*******************************************************************************
 133  *
 134  * FUNCTION:    acpi_ex_exit_interpreter
 135  *
 136  * PARAMETERS:  None
 137  *
 138  * RETURN:      None
 139  *
 140  * DESCRIPTION: Exit the interpreter execution region. This is the top level
 141  *              routine used to exit the interpreter when all processing has
 142  *              been completed.
 143  *
 144  ******************************************************************************/
 145
 146 void acpi_ex_exit_interpreter(void)
 147 {
 148         acpi_status status;
 149
 150         ACPI_FUNCTION_TRACE(ex_exit_interpreter);
 151
 152         status = acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 153         if (ACPI_FAILURE(status)) {
 154                 ACPI_ERROR((AE_INFO,
 155                             "Could not release AML Interpreter mutex"));
 156         }
 157
 158         return_VOID;
 159 }
 160
 161 /*******************************************************************************
 162  *
 163  * FUNCTION:    acpi_ex_relinquish_interpreter
 164  *
 165  * PARAMETERS:  None
 166  *
 167  * RETURN:      None
 168  *
 169  * DESCRIPTION: Exit the interpreter execution region, from within the
 170  *              interpreter - before attempting an operation that will possibly
 171  *              block the running thread.
 172  *
 173  * Cases where the interpreter is unlocked internally
 174  *      1) Method to be blocked on a Sleep() AML opcode
 175  *      2) Method to be blocked on an Acquire() AML opcode
 176  *      3) Method to be blocked on a Wait() AML opcode
 177  *      4) Method to be blocked to acquire the global lock
 178  *      5) Method to be blocked waiting to execute a serialized control method
 179  *          that is currently executing
 180  *      6) About to invoke a user-installed opregion handler
 181  *
 182  ******************************************************************************/
 183
 184 void acpi_ex_relinquish_interpreter(void)
 185 {
 186         ACPI_FUNCTION_TRACE(ex_relinquish_interpreter);
 187
 188         /*
 189          * If the global serialized flag is set, do not release the interpreter.
 190          * This forces the interpreter to be single threaded.
 191          */
 192         if (!acpi_gbl_all_methods_serialized) {
 193                 acpi_ex_exit_interpreter();
 194         }
 195
 196         return_VOID;
 197 }
 198
 199 /*******************************************************************************
 200  *
 201  * FUNCTION:    acpi_ex_truncate_for32bit_table
 202  *
 203  * PARAMETERS:  obj_desc        - Object to be truncated
 204  *
 205  * RETURN:      none
 206  *
 207  * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is
 208  *              32-bit, as determined by the revision of the DSDT.
 209  *
 210  ******************************************************************************/
 211
 212 void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc)
 213 {
 214
 215         ACPI_FUNCTION_ENTRY();
 216
 217         /*
 218          * Object must be a valid number and we must be executing
 219          * a control method. NS node could be there for AML_INT_NAMEPATH_OP.
 220          */
 221         if ((!obj_desc) ||
 222             (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) != ACPI_DESC_TYPE_OPERAND) ||
 223             (obj_desc->common.type != ACPI_TYPE_INTEGER)) {
 224                 return;
 225         }
 226
 227         if (acpi_gbl_integer_byte_width == 4) {
 228                 /*
 229                  * We are running a method that exists in a 32-bit ACPI table.
 230                  * Truncate the value to 32 bits by zeroing out the upper 32-bit field
 231                  */
 232                 obj_desc->integer.value &= (u64) ACPI_UINT32_MAX;
 233         }
 234 }
 235
 236 /*******************************************************************************
 237  *
 238  * FUNCTION:    acpi_ex_acquire_global_lock
 239  *
 240  * PARAMETERS:  field_flags           - Flags with Lock rule:
 241  *                                      always_lock or never_lock
 242  *
 243  * RETURN:      None
 244  *
 245  * DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field
 246  *              flags specifiy that it is to be obtained before field access.
 247  *
 248  ******************************************************************************/
 249
 250 void acpi_ex_acquire_global_lock(u32 field_flags)
 251 {
 252         acpi_status status;
 253
 254         ACPI_FUNCTION_TRACE(ex_acquire_global_lock);
 255
 256         /* Only use the lock if the always_lock bit is set */
 257
 258         if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) {
 259                 return_VOID;
 260         }
 261
 262         /* Attempt to get the global lock, wait forever */
 263
 264         status = acpi_ex_acquire_mutex_object(ACPI_WAIT_FOREVER,
 265                                               acpi_gbl_global_lock_mutex,
 266                                               acpi_os_get_thread_id());
 267
 268         if (ACPI_FAILURE(status)) {
 269                 ACPI_EXCEPTION((AE_INFO, status,
 270                                 "Could not acquire Global Lock"));
 271         }
 272
 273         return_VOID;
 274 }
 275
 276 /*******************************************************************************
 277  *
 278  * FUNCTION:    acpi_ex_release_global_lock
 279  *
 280  * PARAMETERS:  field_flags           - Flags with Lock rule:
 281  *                                      always_lock or never_lock
 282  *
 283  * RETURN:      None
 284  *
 285  * DESCRIPTION: Release the ACPI hardware Global Lock
 286  *
 287  ******************************************************************************/
 288
 289 void acpi_ex_release_global_lock(u32 field_flags)
 290 {
 291         acpi_status status;
 292
 293         ACPI_FUNCTION_TRACE(ex_release_global_lock);
 294
 295         /* Only use the lock if the always_lock bit is set */
 296
 297         if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) {
 298                 return_VOID;
 299         }
 300
 301         /* Release the global lock */
 302
 303         status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
 304         if (ACPI_FAILURE(status)) {
 305
 306                 /* Report the error, but there isn't much else we can do */
 307
 308                 ACPI_EXCEPTION((AE_INFO, status,
 309                                 "Could not release Global Lock"));
 310         }
 311
 312         return_VOID;
 313 }
 314
 315 /*******************************************************************************
 316  *
 317  * FUNCTION:    acpi_ex_digits_needed
 318  *
 319  * PARAMETERS:  value           - Value to be represented
 320  *              base            - Base of representation
 321  *
 322  * RETURN:      The number of digits.
 323  *
 324  * DESCRIPTION: Calculate the number of digits needed to represent the Value
 325  *              in the given Base (Radix)
 326  *
 327  ******************************************************************************/
 328
 329 static u32 acpi_ex_digits_needed(u64 value, u32 base)
 330 {
 331         u32 num_digits;
 332         u64 current_value;
 333
 334         ACPI_FUNCTION_TRACE(ex_digits_needed);
 335
 336         /* u64 is unsigned, so we don't worry about a '-' prefix */
 337
 338         if (value == 0) {
 339                 return_UINT32(1);
 340         }
 341
 342         current_value = value;
 343         num_digits = 0;
 344
 345         /* Count the digits in the requested base */
 346
 347         while (current_value) {
 348                 (void)acpi_ut_short_divide(current_value, base, &current_value,
 349                                            NULL);
 350                 num_digits++;
 351         }
 352
 353         return_UINT32(num_digits);
 354 }
 355
 356 /*******************************************************************************
 357  *
 358  * FUNCTION:    acpi_ex_eisa_id_to_string
 359  *
 360  * PARAMETERS:  compressed_id   - EISAID to be converted
 361  *              out_string      - Where to put the converted string (8 bytes)
 362  *
 363  * RETURN:      None
 364  *
 365  * DESCRIPTION: Convert a numeric EISAID to string representation. Return
 366  *              buffer must be large enough to hold the string. The string
 367  *              returned is always exactly of length ACPI_EISAID_STRING_SIZE
 368  *              (includes null terminator). The EISAID is always 32 bits.
 369  *
 370  ******************************************************************************/
 371
 372 void acpi_ex_eisa_id_to_string(char *out_string, u64 compressed_id)
 373 {
 374         u32 swapped_id;
 375
 376         ACPI_FUNCTION_ENTRY();
 377
 378         /* The EISAID should be a 32-bit integer */
 379
 380         if (compressed_id > ACPI_UINT32_MAX) {
 381                 ACPI_WARNING((AE_INFO,
 382                               "Expected EISAID is larger than 32 bits: 0x%8.8X%8.8X, truncating",
 383                               ACPI_FORMAT_UINT64(compressed_id)));
 384         }
 385
 386         /* Swap ID to big-endian to get contiguous bits */
 387
 388         swapped_id = acpi_ut_dword_byte_swap((u32)compressed_id);
 389
 390         /* First 3 bytes are uppercase letters. Next 4 bytes are hexadecimal */
 391
 392         out_string[0] =
 393             (char)(0x40 + (((unsigned long)swapped_id >> 26) & 0x1F));
 394         out_string[1] = (char)(0x40 + ((swapped_id >> 21) & 0x1F));
 395         out_string[2] = (char)(0x40 + ((swapped_id >> 16) & 0x1F));
 396         out_string[3] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 12);
 397         out_string[4] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 8);
 398         out_string[5] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 4);
 399         out_string[6] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 0);
 400         out_string[7] = 0;
 401 }
 402
 403 /*******************************************************************************
 404  *
 405  * FUNCTION:    acpi_ex_integer_to_string
 406  *
 407  * PARAMETERS:  out_string      - Where to put the converted string. At least
 408  *                                21 bytes are needed to hold the largest
 409  *                                possible 64-bit integer.
 410  *              value           - Value to be converted
 411  *
 412  * RETURN:      None, string
 413  *
 414  * DESCRIPTION: Convert a 64-bit integer to decimal string representation.
 415  *              Assumes string buffer is large enough to hold the string. The
 416  *              largest string is (ACPI_MAX64_DECIMAL_DIGITS + 1).
 417  *
 418  ******************************************************************************/
 419
 420 void acpi_ex_integer_to_string(char *out_string, u64 value)
 421 {
 422         u32 count;
 423         u32 digits_needed;
 424         u32 remainder;
 425
 426         ACPI_FUNCTION_ENTRY();
 427
 428         digits_needed = acpi_ex_digits_needed(value, 10);
 429         out_string[digits_needed] = 0;
 430
 431         for (count = digits_needed; count > 0; count--) {
 432                 (void)acpi_ut_short_divide(value, 10, &value, &remainder);
 433                 out_string[count - 1] = (char)('0' + remainder);
 434         }
 435 }
 436
 437 /*******************************************************************************
 438  *
 439  * FUNCTION:    acpi_is_valid_space_id
 440  *
 441  * PARAMETERS:  space_id            - ID to be validated
 442  *
 443  * RETURN:      TRUE if valid/supported ID.
 444  *
 445  * DESCRIPTION: Validate an operation region space_ID.
 446  *
 447  ******************************************************************************/
 448
 449 u8 acpi_is_valid_space_id(u8 space_id)
 450 {
 451
 452         if ((space_id >= ACPI_NUM_PREDEFINED_REGIONS) &&
 453             (space_id < ACPI_USER_REGION_BEGIN) &&
 454             (space_id != ACPI_ADR_SPACE_DATA_TABLE) &&
 455             (space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 456                 return (FALSE);
 457         }
 458
 459         return (TRUE);
 460 }
 461
 462 #endif