1 2/****************************************************************************** 3 * 4 * Module Name: exutils - interpreter/scanner utilities 5 * 6 *****************************************************************************/ 7 8/* 9 * Copyright (C) 2000 - 2010, Intel Corp. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45/* 46 * DEFINE_AML_GLOBALS is tested in amlcode.h 47 * to determine whether certain global names should be "defined" or only 48 * "declared" in the current compilation. This enhances maintainability 49 * by enabling a single header file to embody all knowledge of the names 50 * in question. 51 * 52 * Exactly one module of any executable should #define DEFINE_GLOBALS 53 * before #including the header files which use this convention. The 54 * names in question will be defined and initialized in that module, 55 * and declared as extern in all other modules which #include those 56 * header files. 57 */ 58 59#define DEFINE_AML_GLOBALS 60 61#include <acpi/acpi.h> 62#include "accommon.h" 63#include "acinterp.h" 64#include "amlcode.h" 65 66#define _COMPONENT ACPI_EXECUTER 67ACPI_MODULE_NAME("exutils") 68 69/* Local prototypes */ 70static u32 acpi_ex_digits_needed(u64 value, u32 base); 71 72#ifndef ACPI_NO_METHOD_EXECUTION 73/******************************************************************************* 74 * 75 * FUNCTION: acpi_ex_enter_interpreter 76 * 77 * PARAMETERS: None 78 * 79 * RETURN: None 80 * 81 * DESCRIPTION: Enter the interpreter execution region. Failure to enter 82 * the interpreter region is a fatal system error. Used in 83 * conjunction with exit_interpreter. 84 * 85 ******************************************************************************/ 86 87void acpi_ex_enter_interpreter(void) 88{ 89 acpi_status status; 90 91 ACPI_FUNCTION_TRACE(ex_enter_interpreter); 92 93 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 94 if (ACPI_FAILURE(status)) { 95 ACPI_ERROR((AE_INFO, 96 "Could not acquire AML Interpreter mutex")); 97 } 98 99 return_VOID; 100} 101 102/******************************************************************************* 103 * 104 * FUNCTION: acpi_ex_reacquire_interpreter 105 * 106 * PARAMETERS: None 107 * 108 * RETURN: None 109 * 110 * DESCRIPTION: Reacquire the interpreter execution region from within the 111 * interpreter code. Failure to enter the interpreter region is a 112 * fatal system error. Used in conjunction with 113 * relinquish_interpreter 114 * 115 ******************************************************************************/ 116 117void acpi_ex_reacquire_interpreter(void) 118{ 119 ACPI_FUNCTION_TRACE(ex_reacquire_interpreter); 120 121 /* 122 * If the global serialized flag is set, do not release the interpreter, 123 * since it was not actually released by acpi_ex_relinquish_interpreter. 124 * This forces the interpreter to be single threaded. 125 */ 126 if (!acpi_gbl_all_methods_serialized) { 127 acpi_ex_enter_interpreter(); 128 } 129 130 return_VOID; 131} 132 133/******************************************************************************* 134 * 135 * FUNCTION: acpi_ex_exit_interpreter 136 * 137 * PARAMETERS: None 138 * 139 * RETURN: None 140 * 141 * DESCRIPTION: Exit the interpreter execution region. This is the top level 142 * routine used to exit the interpreter when all processing has 143 * been completed. 144 * 145 ******************************************************************************/ 146 147void acpi_ex_exit_interpreter(void) 148{ 149 acpi_status status; 150 151 ACPI_FUNCTION_TRACE(ex_exit_interpreter); 152 153 status = acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 154 if (ACPI_FAILURE(status)) { 155 ACPI_ERROR((AE_INFO, 156 "Could not release AML Interpreter mutex")); 157 } 158 159 return_VOID; 160} 161 162/******************************************************************************* 163 * 164 * FUNCTION: acpi_ex_relinquish_interpreter 165 * 166 * PARAMETERS: None 167 * 168 * RETURN: None 169 * 170 * DESCRIPTION: Exit the interpreter execution region, from within the 171 * interpreter - before attempting an operation that will possibly 172 * block the running thread. 173 * 174 * Cases where the interpreter is unlocked internally 175 * 1) Method to be blocked on a Sleep() AML opcode 176 * 2) Method to be blocked on an Acquire() AML opcode 177 * 3) Method to be blocked on a Wait() AML opcode 178 * 4) Method to be blocked to acquire the global lock 179 * 5) Method to be blocked waiting to execute a serialized control method 180 * that is currently executing 181 * 6) About to invoke a user-installed opregion handler 182 * 183 ******************************************************************************/ 184 185void acpi_ex_relinquish_interpreter(void) 186{ 187 ACPI_FUNCTION_TRACE(ex_relinquish_interpreter); 188 189 /* 190 * If the global serialized flag is set, do not release the interpreter. 191 * This forces the interpreter to be single threaded. 192 */ 193 if (!acpi_gbl_all_methods_serialized) { 194 acpi_ex_exit_interpreter(); 195 } 196 197 return_VOID; 198} 199 200/******************************************************************************* 201 * 202 * FUNCTION: acpi_ex_truncate_for32bit_table 203 * 204 * PARAMETERS: obj_desc - Object to be truncated 205 * 206 * RETURN: none 207 * 208 * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is 209 * 32-bit, as determined by the revision of the DSDT. 210 * 211 ******************************************************************************/ 212 213void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc) 214{ 215 216 ACPI_FUNCTION_ENTRY(); 217 218 /* 219 * Object must be a valid number and we must be executing 220 * a control method. NS node could be there for AML_INT_NAMEPATH_OP. 221 */ 222 if ((!obj_desc) || 223 (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) != ACPI_DESC_TYPE_OPERAND) || 224 (obj_desc->common.type != ACPI_TYPE_INTEGER)) { 225 return; 226 } 227 228 if (acpi_gbl_integer_byte_width == 4) { 229 /* 230 * We are running a method that exists in a 32-bit ACPI table. 231 * Truncate the value to 32 bits by zeroing out the upper 32-bit field 232 */ 233 obj_desc->integer.value &= (u64) ACPI_UINT32_MAX; 234 } 235} 236 237/******************************************************************************* 238 * 239 * FUNCTION: acpi_ex_acquire_global_lock 240 * 241 * PARAMETERS: field_flags - Flags with Lock rule: 242 * always_lock or never_lock 243 * 244 * RETURN: None 245 * 246 * DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field 247 * flags specifiy that it is to be obtained before field access. 248 * 249 ******************************************************************************/ 250 251void acpi_ex_acquire_global_lock(u32 field_flags) 252{ 253 acpi_status status; 254 255 ACPI_FUNCTION_TRACE(ex_acquire_global_lock); 256 257 /* Only use the lock if the always_lock bit is set */ 258 259 if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) { 260 return_VOID; 261 } 262 263 /* Attempt to get the global lock, wait forever */ 264 265 status = acpi_ex_acquire_mutex_object(ACPI_WAIT_FOREVER, 266 acpi_gbl_global_lock_mutex, 267 acpi_os_get_thread_id()); 268 269 if (ACPI_FAILURE(status)) { 270 ACPI_EXCEPTION((AE_INFO, status, 271 "Could not acquire Global Lock")); 272 } 273 274 return_VOID; 275} 276 277/******************************************************************************* 278 * 279 * FUNCTION: acpi_ex_release_global_lock 280 * 281 * PARAMETERS: field_flags - Flags with Lock rule: 282 * always_lock or never_lock 283 * 284 * RETURN: None 285 * 286 * DESCRIPTION: Release the ACPI hardware Global Lock 287 * 288 ******************************************************************************/ 289 290void acpi_ex_release_global_lock(u32 field_flags) 291{ 292 acpi_status status; 293 294 ACPI_FUNCTION_TRACE(ex_release_global_lock); 295 296 /* Only use the lock if the always_lock bit is set */ 297 298 if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) { 299 return_VOID; 300 } 301 302 /* Release the global lock */ 303 304 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex); 305 if (ACPI_FAILURE(status)) { 306 307 /* Report the error, but there isn't much else we can do */ 308 309 ACPI_EXCEPTION((AE_INFO, status, 310 "Could not release Global Lock")); 311 } 312 313 return_VOID; 314} 315 316/******************************************************************************* 317 * 318 * FUNCTION: acpi_ex_digits_needed 319 * 320 * PARAMETERS: Value - Value to be represented 321 * Base - Base of representation 322 * 323 * RETURN: The number of digits. 324 * 325 * DESCRIPTION: Calculate the number of digits needed to represent the Value 326 * in the given Base (Radix) 327 * 328 ******************************************************************************/ 329 330static u32 acpi_ex_digits_needed(u64 value, u32 base) 331{ 332 u32 num_digits; 333 u64 current_value; 334 335 ACPI_FUNCTION_TRACE(ex_digits_needed); 336 337 /* u64 is unsigned, so we don't worry about a '-' prefix */ 338 339 if (value == 0) { 340 return_UINT32(1); 341 } 342 343 current_value = value; 344 num_digits = 0; 345 346 /* Count the digits in the requested base */ 347 348 while (current_value) { 349 (void)acpi_ut_short_divide(current_value, base, ¤t_value, 350 NULL); 351 num_digits++; 352 } 353 354 return_UINT32(num_digits); 355} 356 357/******************************************************************************* 358 * 359 * FUNCTION: acpi_ex_eisa_id_to_string 360 * 361 * PARAMETERS: compressed_id - EISAID to be converted 362 * out_string - Where to put the converted string (8 bytes) 363 * 364 * RETURN: None 365 * 366 * DESCRIPTION: Convert a numeric EISAID to string representation. Return 367 * buffer must be large enough to hold the string. The string 368 * returned is always exactly of length ACPI_EISAID_STRING_SIZE 369 * (includes null terminator). The EISAID is always 32 bits. 370 * 371 ******************************************************************************/ 372 373void acpi_ex_eisa_id_to_string(char *out_string, u64 compressed_id) 374{ 375 u32 swapped_id; 376 377 ACPI_FUNCTION_ENTRY(); 378 379 /* The EISAID should be a 32-bit integer */ 380 381 if (compressed_id > ACPI_UINT32_MAX) { 382 ACPI_WARNING((AE_INFO, 383 "Expected EISAID is larger than 32 bits: 0x%8.8X%8.8X, truncating", 384 ACPI_FORMAT_UINT64(compressed_id))); 385 } 386 387 /* Swap ID to big-endian to get contiguous bits */ 388 389 swapped_id = acpi_ut_dword_byte_swap((u32)compressed_id); 390 391 /* First 3 bytes are uppercase letters. Next 4 bytes are hexadecimal */ 392 393 out_string[0] = 394 (char)(0x40 + (((unsigned long)swapped_id >> 26) & 0x1F)); 395 out_string[1] = (char)(0x40 + ((swapped_id >> 21) & 0x1F)); 396 out_string[2] = (char)(0x40 + ((swapped_id >> 16) & 0x1F)); 397 out_string[3] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 12); 398 out_string[4] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 8); 399 out_string[5] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 4); 400 out_string[6] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 0); 401 out_string[7] = 0; 402} 403 404/******************************************************************************* 405 * 406 * FUNCTION: acpi_ex_integer_to_string 407 * 408 * PARAMETERS: out_string - Where to put the converted string. At least 409 * 21 bytes are needed to hold the largest 410 * possible 64-bit integer. 411 * Value - Value to be converted 412 * 413 * RETURN: None, string 414 * 415 * DESCRIPTION: Convert a 64-bit integer to decimal string representation. 416 * Assumes string buffer is large enough to hold the string. The 417 * largest string is (ACPI_MAX64_DECIMAL_DIGITS + 1). 418 * 419 ******************************************************************************/ 420 421void acpi_ex_integer_to_string(char *out_string, u64 value) 422{ 423 u32 count; 424 u32 digits_needed; 425 u32 remainder; 426 427 ACPI_FUNCTION_ENTRY(); 428 429 digits_needed = acpi_ex_digits_needed(value, 10); 430 out_string[digits_needed] = 0; 431 432 for (count = digits_needed; count > 0; count--) { 433 (void)acpi_ut_short_divide(value, 10, &value, &remainder); 434 out_string[count - 1] = (char)('0' + remainder); 435 } 436} 437 438#endif 439