drivers/acpi/acpica/exutils.c

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