1/****************************************************************************** 2 * 3 * Module Name: exutils - interpreter/scanner utilities 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2014, 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 66ACPI_MODULE_NAME("exutils") 67 68/* Local prototypes */ 69static 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 86void 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_exit_interpreter 104 * 105 * PARAMETERS: None 106 * 107 * RETURN: None 108 * 109 * DESCRIPTION: Exit the interpreter execution region. This is the top level 110 * routine used to exit the interpreter when all processing has 111 * been completed, or when the method blocks. 112 * 113 * Cases where the interpreter is unlocked internally: 114 * 1) Method will be blocked on a Sleep() AML opcode 115 * 2) Method will be blocked on an Acquire() AML opcode 116 * 3) Method will be blocked on a Wait() AML opcode 117 * 4) Method will be blocked to acquire the global lock 118 * 5) Method will be blocked waiting to execute a serialized control 119 * method that is currently executing 120 * 6) About to invoke a user-installed opregion handler 121 * 122 ******************************************************************************/ 123 124void acpi_ex_exit_interpreter(void) 125{ 126 acpi_status status; 127 128 ACPI_FUNCTION_TRACE(ex_exit_interpreter); 129 130 status = acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 131 if (ACPI_FAILURE(status)) { 132 ACPI_ERROR((AE_INFO, 133 "Could not release AML Interpreter mutex")); 134 } 135 136 return_VOID; 137} 138 139/******************************************************************************* 140 * 141 * FUNCTION: acpi_ex_truncate_for32bit_table 142 * 143 * PARAMETERS: obj_desc - Object to be truncated 144 * 145 * RETURN: TRUE if a truncation was performed, FALSE otherwise. 146 * 147 * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is 148 * 32-bit, as determined by the revision of the DSDT. 149 * 150 ******************************************************************************/ 151 152u8 acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc) 153{ 154 155 ACPI_FUNCTION_ENTRY(); 156 157 /* 158 * Object must be a valid number and we must be executing 159 * a control method. Object could be NS node for AML_INT_NAMEPATH_OP. 160 */ 161 if ((!obj_desc) || 162 (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) != ACPI_DESC_TYPE_OPERAND) || 163 (obj_desc->common.type != ACPI_TYPE_INTEGER)) { 164 return (FALSE); 165 } 166 167 if ((acpi_gbl_integer_byte_width == 4) && 168 (obj_desc->integer.value > (u64)ACPI_UINT32_MAX)) { 169 /* 170 * We are executing in a 32-bit ACPI table. 171 * Truncate the value to 32 bits by zeroing out the upper 32-bit field 172 */ 173 obj_desc->integer.value &= (u64)ACPI_UINT32_MAX; 174 return (TRUE); 175 } 176 177 return (FALSE); 178} 179 180/******************************************************************************* 181 * 182 * FUNCTION: acpi_ex_acquire_global_lock 183 * 184 * PARAMETERS: field_flags - Flags with Lock rule: 185 * always_lock or never_lock 186 * 187 * RETURN: None 188 * 189 * DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field 190 * flags specifiy that it is to be obtained before field access. 191 * 192 ******************************************************************************/ 193 194void acpi_ex_acquire_global_lock(u32 field_flags) 195{ 196 acpi_status status; 197 198 ACPI_FUNCTION_TRACE(ex_acquire_global_lock); 199 200 /* Only use the lock if the always_lock bit is set */ 201 202 if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) { 203 return_VOID; 204 } 205 206 /* Attempt to get the global lock, wait forever */ 207 208 status = acpi_ex_acquire_mutex_object(ACPI_WAIT_FOREVER, 209 acpi_gbl_global_lock_mutex, 210 acpi_os_get_thread_id()); 211 212 if (ACPI_FAILURE(status)) { 213 ACPI_EXCEPTION((AE_INFO, status, 214 "Could not acquire Global Lock")); 215 } 216 217 return_VOID; 218} 219 220/******************************************************************************* 221 * 222 * FUNCTION: acpi_ex_release_global_lock 223 * 224 * PARAMETERS: field_flags - Flags with Lock rule: 225 * always_lock or never_lock 226 * 227 * RETURN: None 228 * 229 * DESCRIPTION: Release the ACPI hardware Global Lock 230 * 231 ******************************************************************************/ 232 233void acpi_ex_release_global_lock(u32 field_flags) 234{ 235 acpi_status status; 236 237 ACPI_FUNCTION_TRACE(ex_release_global_lock); 238 239 /* Only use the lock if the always_lock bit is set */ 240 241 if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) { 242 return_VOID; 243 } 244 245 /* Release the global lock */ 246 247 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex); 248 if (ACPI_FAILURE(status)) { 249 250 /* Report the error, but there isn't much else we can do */ 251 252 ACPI_EXCEPTION((AE_INFO, status, 253 "Could not release Global Lock")); 254 } 255 256 return_VOID; 257} 258 259/******************************************************************************* 260 * 261 * FUNCTION: acpi_ex_digits_needed 262 * 263 * PARAMETERS: value - Value to be represented 264 * base - Base of representation 265 * 266 * RETURN: The number of digits. 267 * 268 * DESCRIPTION: Calculate the number of digits needed to represent the Value 269 * in the given Base (Radix) 270 * 271 ******************************************************************************/ 272 273static u32 acpi_ex_digits_needed(u64 value, u32 base) 274{ 275 u32 num_digits; 276 u64 current_value; 277 278 ACPI_FUNCTION_TRACE(ex_digits_needed); 279 280 /* u64 is unsigned, so we don't worry about a '-' prefix */ 281 282 if (value == 0) { 283 return_UINT32(1); 284 } 285 286 current_value = value; 287 num_digits = 0; 288 289 /* Count the digits in the requested base */ 290 291 while (current_value) { 292 (void)acpi_ut_short_divide(current_value, base, ¤t_value, 293 NULL); 294 num_digits++; 295 } 296 297 return_UINT32(num_digits); 298} 299 300/******************************************************************************* 301 * 302 * FUNCTION: acpi_ex_eisa_id_to_string 303 * 304 * PARAMETERS: compressed_id - EISAID to be converted 305 * out_string - Where to put the converted string (8 bytes) 306 * 307 * RETURN: None 308 * 309 * DESCRIPTION: Convert a numeric EISAID to string representation. Return 310 * buffer must be large enough to hold the string. The string 311 * returned is always exactly of length ACPI_EISAID_STRING_SIZE 312 * (includes null terminator). The EISAID is always 32 bits. 313 * 314 ******************************************************************************/ 315 316void acpi_ex_eisa_id_to_string(char *out_string, u64 compressed_id) 317{ 318 u32 swapped_id; 319 320 ACPI_FUNCTION_ENTRY(); 321 322 /* The EISAID should be a 32-bit integer */ 323 324 if (compressed_id > ACPI_UINT32_MAX) { 325 ACPI_WARNING((AE_INFO, 326 "Expected EISAID is larger than 32 bits: 0x%8.8X%8.8X, truncating", 327 ACPI_FORMAT_UINT64(compressed_id))); 328 } 329 330 /* Swap ID to big-endian to get contiguous bits */ 331 332 swapped_id = acpi_ut_dword_byte_swap((u32)compressed_id); 333 334 /* First 3 bytes are uppercase letters. Next 4 bytes are hexadecimal */ 335 336 out_string[0] = 337 (char)(0x40 + (((unsigned long)swapped_id >> 26) & 0x1F)); 338 out_string[1] = (char)(0x40 + ((swapped_id >> 21) & 0x1F)); 339 out_string[2] = (char)(0x40 + ((swapped_id >> 16) & 0x1F)); 340 out_string[3] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 12); 341 out_string[4] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 8); 342 out_string[5] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 4); 343 out_string[6] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 0); 344 out_string[7] = 0; 345} 346 347/******************************************************************************* 348 * 349 * FUNCTION: acpi_ex_integer_to_string 350 * 351 * PARAMETERS: out_string - Where to put the converted string. At least 352 * 21 bytes are needed to hold the largest 353 * possible 64-bit integer. 354 * value - Value to be converted 355 * 356 * RETURN: None, string 357 * 358 * DESCRIPTION: Convert a 64-bit integer to decimal string representation. 359 * Assumes string buffer is large enough to hold the string. The 360 * largest string is (ACPI_MAX64_DECIMAL_DIGITS + 1). 361 * 362 ******************************************************************************/ 363 364void acpi_ex_integer_to_string(char *out_string, u64 value) 365{ 366 u32 count; 367 u32 digits_needed; 368 u32 remainder; 369 370 ACPI_FUNCTION_ENTRY(); 371 372 digits_needed = acpi_ex_digits_needed(value, 10); 373 out_string[digits_needed] = 0; 374 375 for (count = digits_needed; count > 0; count--) { 376 (void)acpi_ut_short_divide(value, 10, &value, &remainder); 377 out_string[count - 1] = (char)('0' + remainder); 378 } 379} 380 381/******************************************************************************* 382 * 383 * FUNCTION: acpi_is_valid_space_id 384 * 385 * PARAMETERS: space_id - ID to be validated 386 * 387 * RETURN: TRUE if valid/supported ID. 388 * 389 * DESCRIPTION: Validate an operation region space_ID. 390 * 391 ******************************************************************************/ 392 393u8 acpi_is_valid_space_id(u8 space_id) 394{ 395 396 if ((space_id >= ACPI_NUM_PREDEFINED_REGIONS) && 397 (space_id < ACPI_USER_REGION_BEGIN) && 398 (space_id != ACPI_ADR_SPACE_DATA_TABLE) && 399 (space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) { 400 return (FALSE); 401 } 402 403 return (TRUE); 404} 405 406#endif 407