1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: exconvrt - Object conversion routines 5 * 6 * Copyright (C) 2000 - 2020, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 #include "acinterp.h" 13 #include "amlcode.h" 14 15 #define _COMPONENT ACPI_EXECUTER 16 ACPI_MODULE_NAME("exconvrt") 17 18 /* Local prototypes */ 19 static u32 20 acpi_ex_convert_to_ascii(u64 integer, u16 base, u8 *string, u8 max_length); 21 22 /******************************************************************************* 23 * 24 * FUNCTION: acpi_ex_convert_to_integer 25 * 26 * PARAMETERS: obj_desc - Object to be converted. Must be an 27 * Integer, Buffer, or String 28 * result_desc - Where the new Integer object is returned 29 * implicit_conversion - Used for string conversion 30 * 31 * RETURN: Status 32 * 33 * DESCRIPTION: Convert an ACPI Object to an integer. 34 * 35 ******************************************************************************/ 36 37 acpi_status 38 acpi_ex_convert_to_integer(union acpi_operand_object *obj_desc, 39 union acpi_operand_object **result_desc, 40 u32 implicit_conversion) 41 { 42 union acpi_operand_object *return_desc; 43 u8 *pointer; 44 u64 result; 45 u32 i; 46 u32 count; 47 48 ACPI_FUNCTION_TRACE_PTR(ex_convert_to_integer, obj_desc); 49 50 switch (obj_desc->common.type) { 51 case ACPI_TYPE_INTEGER: 52 53 /* No conversion necessary */ 54 55 *result_desc = obj_desc; 56 return_ACPI_STATUS(AE_OK); 57 58 case ACPI_TYPE_BUFFER: 59 case ACPI_TYPE_STRING: 60 61 /* Note: Takes advantage of common buffer/string fields */ 62 63 pointer = obj_desc->buffer.pointer; 64 count = obj_desc->buffer.length; 65 break; 66 67 default: 68 69 return_ACPI_STATUS(AE_TYPE); 70 } 71 72 /* 73 * Convert the buffer/string to an integer. Note that both buffers and 74 * strings are treated as raw data - we don't convert ascii to hex for 75 * strings. 76 * 77 * There are two terminating conditions for the loop: 78 * 1) The size of an integer has been reached, or 79 * 2) The end of the buffer or string has been reached 80 */ 81 result = 0; 82 83 /* String conversion is different than Buffer conversion */ 84 85 switch (obj_desc->common.type) { 86 case ACPI_TYPE_STRING: 87 /* 88 * Convert string to an integer - for most cases, the string must be 89 * hexadecimal as per the ACPI specification. The only exception (as 90 * of ACPI 3.0) is that the to_integer() operator allows both decimal 91 * and hexadecimal strings (hex prefixed with "0x"). 92 * 93 * Explicit conversion is used only by to_integer. 94 * All other string-to-integer conversions are implicit conversions. 95 */ 96 if (implicit_conversion) { 97 result = 98 acpi_ut_implicit_strtoul64(ACPI_CAST_PTR 99 (char, pointer)); 100 } else { 101 result = 102 acpi_ut_explicit_strtoul64(ACPI_CAST_PTR 103 (char, pointer)); 104 } 105 break; 106 107 case ACPI_TYPE_BUFFER: 108 109 /* Check for zero-length buffer */ 110 111 if (!count) { 112 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); 113 } 114 115 /* Transfer no more than an integer's worth of data */ 116 117 if (count > acpi_gbl_integer_byte_width) { 118 count = acpi_gbl_integer_byte_width; 119 } 120 121 /* 122 * Convert buffer to an integer - we simply grab enough raw data 123 * from the buffer to fill an integer 124 */ 125 for (i = 0; i < count; i++) { 126 /* 127 * Get next byte and shift it into the Result. 128 * Little endian is used, meaning that the first byte of the buffer 129 * is the LSB of the integer 130 */ 131 result |= (((u64) pointer[i]) << (i * 8)); 132 } 133 break; 134 135 default: 136 137 /* No other types can get here */ 138 139 break; 140 } 141 142 /* Create a new integer */ 143 144 return_desc = acpi_ut_create_integer_object(result); 145 if (!return_desc) { 146 return_ACPI_STATUS(AE_NO_MEMORY); 147 } 148 149 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n", 150 ACPI_FORMAT_UINT64(result))); 151 152 /* Save the Result */ 153 154 (void)acpi_ex_truncate_for32bit_table(return_desc); 155 *result_desc = return_desc; 156 return_ACPI_STATUS(AE_OK); 157 } 158 159 /******************************************************************************* 160 * 161 * FUNCTION: acpi_ex_convert_to_buffer 162 * 163 * PARAMETERS: obj_desc - Object to be converted. Must be an 164 * Integer, Buffer, or String 165 * result_desc - Where the new buffer object is returned 166 * 167 * RETURN: Status 168 * 169 * DESCRIPTION: Convert an ACPI Object to a Buffer 170 * 171 ******************************************************************************/ 172 173 acpi_status 174 acpi_ex_convert_to_buffer(union acpi_operand_object *obj_desc, 175 union acpi_operand_object **result_desc) 176 { 177 union acpi_operand_object *return_desc; 178 u8 *new_buf; 179 180 ACPI_FUNCTION_TRACE_PTR(ex_convert_to_buffer, obj_desc); 181 182 switch (obj_desc->common.type) { 183 case ACPI_TYPE_BUFFER: 184 185 /* No conversion necessary */ 186 187 *result_desc = obj_desc; 188 return_ACPI_STATUS(AE_OK); 189 190 case ACPI_TYPE_INTEGER: 191 /* 192 * Create a new Buffer object. 193 * Need enough space for one integer 194 */ 195 return_desc = 196 acpi_ut_create_buffer_object(acpi_gbl_integer_byte_width); 197 if (!return_desc) { 198 return_ACPI_STATUS(AE_NO_MEMORY); 199 } 200 201 /* Copy the integer to the buffer, LSB first */ 202 203 new_buf = return_desc->buffer.pointer; 204 memcpy(new_buf, &obj_desc->integer.value, 205 acpi_gbl_integer_byte_width); 206 break; 207 208 case ACPI_TYPE_STRING: 209 /* 210 * Create a new Buffer object 211 * Size will be the string length 212 * 213 * NOTE: Add one to the string length to include the null terminator. 214 * The ACPI spec is unclear on this subject, but there is existing 215 * ASL/AML code that depends on the null being transferred to the new 216 * buffer. 217 */ 218 return_desc = acpi_ut_create_buffer_object((acpi_size) 219 obj_desc->string. 220 length + 1); 221 if (!return_desc) { 222 return_ACPI_STATUS(AE_NO_MEMORY); 223 } 224 225 /* Copy the string to the buffer */ 226 227 new_buf = return_desc->buffer.pointer; 228 strncpy((char *)new_buf, (char *)obj_desc->string.pointer, 229 obj_desc->string.length); 230 break; 231 232 default: 233 234 return_ACPI_STATUS(AE_TYPE); 235 } 236 237 /* Mark buffer initialized */ 238 239 return_desc->common.flags |= AOPOBJ_DATA_VALID; 240 *result_desc = return_desc; 241 return_ACPI_STATUS(AE_OK); 242 } 243 244 /******************************************************************************* 245 * 246 * FUNCTION: acpi_ex_convert_to_ascii 247 * 248 * PARAMETERS: integer - Value to be converted 249 * base - ACPI_STRING_DECIMAL or ACPI_STRING_HEX 250 * string - Where the string is returned 251 * data_width - Size of data item to be converted, in bytes 252 * 253 * RETURN: Actual string length 254 * 255 * DESCRIPTION: Convert an ACPI Integer to a hex or decimal string 256 * 257 ******************************************************************************/ 258 259 static u32 260 acpi_ex_convert_to_ascii(u64 integer, u16 base, u8 *string, u8 data_width) 261 { 262 u64 digit; 263 u32 i; 264 u32 j; 265 u32 k = 0; 266 u32 hex_length; 267 u32 decimal_length; 268 u32 remainder; 269 u8 supress_zeros; 270 271 ACPI_FUNCTION_ENTRY(); 272 273 switch (base) { 274 case 10: 275 276 /* Setup max length for the decimal number */ 277 278 switch (data_width) { 279 case 1: 280 281 decimal_length = ACPI_MAX8_DECIMAL_DIGITS; 282 break; 283 284 case 4: 285 286 decimal_length = ACPI_MAX32_DECIMAL_DIGITS; 287 break; 288 289 case 8: 290 default: 291 292 decimal_length = ACPI_MAX64_DECIMAL_DIGITS; 293 break; 294 } 295 296 supress_zeros = TRUE; /* No leading zeros */ 297 remainder = 0; 298 299 for (i = decimal_length; i > 0; i--) { 300 301 /* Divide by nth factor of 10 */ 302 303 digit = integer; 304 for (j = 0; j < i; j++) { 305 (void)acpi_ut_short_divide(digit, 10, &digit, 306 &remainder); 307 } 308 309 /* Handle leading zeros */ 310 311 if (remainder != 0) { 312 supress_zeros = FALSE; 313 } 314 315 if (!supress_zeros) { 316 string[k] = (u8) (ACPI_ASCII_ZERO + remainder); 317 k++; 318 } 319 } 320 break; 321 322 case 16: 323 324 /* hex_length: 2 ascii hex chars per data byte */ 325 326 hex_length = (data_width * 2); 327 for (i = 0, j = (hex_length - 1); i < hex_length; i++, j--) { 328 329 /* Get one hex digit, most significant digits first */ 330 331 string[k] = (u8) 332 acpi_ut_hex_to_ascii_char(integer, ACPI_MUL_4(j)); 333 k++; 334 } 335 break; 336 337 default: 338 return (0); 339 } 340 341 /* 342 * Since leading zeros are suppressed, we must check for the case where 343 * the integer equals 0 344 * 345 * Finally, null terminate the string and return the length 346 */ 347 if (!k) { 348 string[0] = ACPI_ASCII_ZERO; 349 k = 1; 350 } 351 352 string[k] = 0; 353 return ((u32) k); 354 } 355 356 /******************************************************************************* 357 * 358 * FUNCTION: acpi_ex_convert_to_string 359 * 360 * PARAMETERS: obj_desc - Object to be converted. Must be an 361 * Integer, Buffer, or String 362 * result_desc - Where the string object is returned 363 * type - String flags (base and conversion type) 364 * 365 * RETURN: Status 366 * 367 * DESCRIPTION: Convert an ACPI Object to a string. Supports both implicit 368 * and explicit conversions and related rules. 369 * 370 ******************************************************************************/ 371 372 acpi_status 373 acpi_ex_convert_to_string(union acpi_operand_object * obj_desc, 374 union acpi_operand_object ** result_desc, u32 type) 375 { 376 union acpi_operand_object *return_desc; 377 u8 *new_buf; 378 u32 i; 379 u32 string_length = 0; 380 u16 base = 16; 381 u8 separator = ','; 382 383 ACPI_FUNCTION_TRACE_PTR(ex_convert_to_string, obj_desc); 384 385 switch (obj_desc->common.type) { 386 case ACPI_TYPE_STRING: 387 388 /* No conversion necessary */ 389 390 *result_desc = obj_desc; 391 return_ACPI_STATUS(AE_OK); 392 393 case ACPI_TYPE_INTEGER: 394 395 switch (type) { 396 case ACPI_EXPLICIT_CONVERT_DECIMAL: 397 /* 398 * From to_decimal_string, integer source. 399 * 400 * Make room for the maximum decimal number size 401 */ 402 string_length = ACPI_MAX_DECIMAL_DIGITS; 403 base = 10; 404 break; 405 406 default: 407 408 /* Two hex string characters for each integer byte */ 409 410 string_length = ACPI_MUL_2(acpi_gbl_integer_byte_width); 411 break; 412 } 413 414 /* 415 * Create a new String 416 * Need enough space for one ASCII integer (plus null terminator) 417 */ 418 return_desc = 419 acpi_ut_create_string_object((acpi_size)string_length); 420 if (!return_desc) { 421 return_ACPI_STATUS(AE_NO_MEMORY); 422 } 423 424 new_buf = return_desc->buffer.pointer; 425 426 /* Convert integer to string */ 427 428 string_length = 429 acpi_ex_convert_to_ascii(obj_desc->integer.value, base, 430 new_buf, 431 acpi_gbl_integer_byte_width); 432 433 /* Null terminate at the correct place */ 434 435 return_desc->string.length = string_length; 436 new_buf[string_length] = 0; 437 break; 438 439 case ACPI_TYPE_BUFFER: 440 441 /* Setup string length, base, and separator */ 442 443 switch (type) { 444 case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by to_decimal_string */ 445 /* 446 * Explicit conversion from the to_decimal_string ASL operator. 447 * 448 * From ACPI: "If the input is a buffer, it is converted to a 449 * a string of decimal values separated by commas." 450 */ 451 base = 10; 452 453 /* 454 * Calculate the final string length. Individual string values 455 * are variable length (include separator for each) 456 */ 457 for (i = 0; i < obj_desc->buffer.length; i++) { 458 if (obj_desc->buffer.pointer[i] >= 100) { 459 string_length += 4; 460 } else if (obj_desc->buffer.pointer[i] >= 10) { 461 string_length += 3; 462 } else { 463 string_length += 2; 464 } 465 } 466 break; 467 468 case ACPI_IMPLICIT_CONVERT_HEX: 469 /* 470 * Implicit buffer-to-string conversion 471 * 472 * From the ACPI spec: 473 * "The entire contents of the buffer are converted to a string of 474 * two-character hexadecimal numbers, each separated by a space." 475 * 476 * Each hex number is prefixed with 0x (11/2018) 477 */ 478 separator = ' '; 479 string_length = (obj_desc->buffer.length * 5); 480 break; 481 482 case ACPI_EXPLICIT_CONVERT_HEX: 483 /* 484 * Explicit conversion from the to_hex_string ASL operator. 485 * 486 * From ACPI: "If Data is a buffer, it is converted to a string of 487 * hexadecimal values separated by commas." 488 * 489 * Each hex number is prefixed with 0x (11/2018) 490 */ 491 separator = ','; 492 string_length = (obj_desc->buffer.length * 5); 493 break; 494 495 default: 496 return_ACPI_STATUS(AE_BAD_PARAMETER); 497 } 498 499 /* 500 * Create a new string object and string buffer 501 * (-1 because of extra separator included in string_length from above) 502 * Allow creation of zero-length strings from zero-length buffers. 503 */ 504 if (string_length) { 505 string_length--; 506 } 507 508 return_desc = 509 acpi_ut_create_string_object((acpi_size)string_length); 510 if (!return_desc) { 511 return_ACPI_STATUS(AE_NO_MEMORY); 512 } 513 514 new_buf = return_desc->buffer.pointer; 515 516 /* 517 * Convert buffer bytes to hex or decimal values 518 * (separated by commas or spaces) 519 */ 520 for (i = 0; i < obj_desc->buffer.length; i++) { 521 if (base == 16) { 522 523 /* Emit 0x prefix for explicit/implicit hex conversion */ 524 525 *new_buf++ = '0'; 526 *new_buf++ = 'x'; 527 } 528 529 new_buf += acpi_ex_convert_to_ascii((u64) obj_desc-> 530 buffer.pointer[i], 531 base, new_buf, 1); 532 533 /* Each digit is separated by either a comma or space */ 534 535 *new_buf++ = separator; 536 } 537 538 /* 539 * Null terminate the string 540 * (overwrites final comma/space from above) 541 */ 542 if (obj_desc->buffer.length) { 543 new_buf--; 544 } 545 *new_buf = 0; 546 break; 547 548 default: 549 550 return_ACPI_STATUS(AE_TYPE); 551 } 552 553 *result_desc = return_desc; 554 return_ACPI_STATUS(AE_OK); 555 } 556 557 /******************************************************************************* 558 * 559 * FUNCTION: acpi_ex_convert_to_target_type 560 * 561 * PARAMETERS: destination_type - Current type of the destination 562 * source_desc - Source object to be converted. 563 * result_desc - Where the converted object is returned 564 * walk_state - Current method state 565 * 566 * RETURN: Status 567 * 568 * DESCRIPTION: Implements "implicit conversion" rules for storing an object. 569 * 570 ******************************************************************************/ 571 572 acpi_status 573 acpi_ex_convert_to_target_type(acpi_object_type destination_type, 574 union acpi_operand_object *source_desc, 575 union acpi_operand_object **result_desc, 576 struct acpi_walk_state *walk_state) 577 { 578 acpi_status status = AE_OK; 579 580 ACPI_FUNCTION_TRACE(ex_convert_to_target_type); 581 582 /* Default behavior */ 583 584 *result_desc = source_desc; 585 586 /* 587 * If required by the target, 588 * perform implicit conversion on the source before we store it. 589 */ 590 switch (GET_CURRENT_ARG_TYPE(walk_state->op_info->runtime_args)) { 591 case ARGI_SIMPLE_TARGET: 592 case ARGI_FIXED_TARGET: 593 case ARGI_INTEGER_REF: /* Handles Increment, Decrement cases */ 594 595 switch (destination_type) { 596 case ACPI_TYPE_LOCAL_REGION_FIELD: 597 /* 598 * Named field can always handle conversions 599 */ 600 break; 601 602 default: 603 604 /* No conversion allowed for these types */ 605 606 if (destination_type != source_desc->common.type) { 607 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 608 "Explicit operator, will store (%s) over existing type (%s)\n", 609 acpi_ut_get_object_type_name 610 (source_desc), 611 acpi_ut_get_type_name 612 (destination_type))); 613 status = AE_TYPE; 614 } 615 } 616 break; 617 618 case ARGI_TARGETREF: 619 case ARGI_STORE_TARGET: 620 621 switch (destination_type) { 622 case ACPI_TYPE_INTEGER: 623 case ACPI_TYPE_BUFFER_FIELD: 624 case ACPI_TYPE_LOCAL_BANK_FIELD: 625 case ACPI_TYPE_LOCAL_INDEX_FIELD: 626 /* 627 * These types require an Integer operand. We can convert 628 * a Buffer or a String to an Integer if necessary. 629 */ 630 status = 631 acpi_ex_convert_to_integer(source_desc, result_desc, 632 ACPI_IMPLICIT_CONVERSION); 633 break; 634 635 case ACPI_TYPE_STRING: 636 /* 637 * The operand must be a String. We can convert an 638 * Integer or Buffer if necessary 639 */ 640 status = 641 acpi_ex_convert_to_string(source_desc, result_desc, 642 ACPI_IMPLICIT_CONVERT_HEX); 643 break; 644 645 case ACPI_TYPE_BUFFER: 646 /* 647 * The operand must be a Buffer. We can convert an 648 * Integer or String if necessary 649 */ 650 status = 651 acpi_ex_convert_to_buffer(source_desc, result_desc); 652 break; 653 654 default: 655 656 ACPI_ERROR((AE_INFO, 657 "Bad destination type during conversion: 0x%X", 658 destination_type)); 659 status = AE_AML_INTERNAL; 660 break; 661 } 662 break; 663 664 case ARGI_REFERENCE: 665 /* 666 * create_xxxx_field cases - we are storing the field object into the name 667 */ 668 break; 669 670 default: 671 672 ACPI_ERROR((AE_INFO, 673 "Unknown Target type ID 0x%X AmlOpcode 0x%X DestType %s", 674 GET_CURRENT_ARG_TYPE(walk_state->op_info-> 675 runtime_args), 676 walk_state->opcode, 677 acpi_ut_get_type_name(destination_type))); 678 status = AE_AML_INTERNAL; 679 } 680 681 /* 682 * Source-to-Target conversion semantics: 683 * 684 * If conversion to the target type cannot be performed, then simply 685 * overwrite the target with the new object and type. 686 */ 687 if (status == AE_TYPE) { 688 status = AE_OK; 689 } 690 691 return_ACPI_STATUS(status); 692 } 693