1 /****************************************************************************** 2 * 3 * Module Name: tbfadt - FADT table 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 #include "acpi.h" 45 #include "accommon.h" 46 #include "actables.h" 47 48 #define _COMPONENT ACPI_TABLES 49 ACPI_MODULE_NAME ("tbfadt") 50 51 /* Local prototypes */ 52 53 static void 54 AcpiTbInitGenericAddress ( 55 ACPI_GENERIC_ADDRESS *GenericAddress, 56 UINT8 SpaceId, 57 UINT8 ByteWidth, 58 UINT64 Address, 59 const char *RegisterName, 60 UINT8 Flags); 61 62 static void 63 AcpiTbConvertFadt ( 64 void); 65 66 static void 67 AcpiTbSetupFadtRegisters ( 68 void); 69 70 static UINT64 71 AcpiTbSelectAddress ( 72 char *RegisterName, 73 UINT32 Address32, 74 UINT64 Address64); 75 76 77 /* Table for conversion of FADT to common internal format and FADT validation */ 78 79 typedef struct acpi_fadt_info 80 { 81 const char *Name; 82 UINT16 Address64; 83 UINT16 Address32; 84 UINT16 Length; 85 UINT8 DefaultLength; 86 UINT8 Flags; 87 88 } ACPI_FADT_INFO; 89 90 #define ACPI_FADT_OPTIONAL 0 91 #define ACPI_FADT_REQUIRED 1 92 #define ACPI_FADT_SEPARATE_LENGTH 2 93 #define ACPI_FADT_GPE_REGISTER 4 94 95 static ACPI_FADT_INFO FadtInfoTable[] = 96 { 97 {"Pm1aEventBlock", 98 ACPI_FADT_OFFSET (XPm1aEventBlock), 99 ACPI_FADT_OFFSET (Pm1aEventBlock), 100 ACPI_FADT_OFFSET (Pm1EventLength), 101 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ 102 ACPI_FADT_REQUIRED}, 103 104 {"Pm1bEventBlock", 105 ACPI_FADT_OFFSET (XPm1bEventBlock), 106 ACPI_FADT_OFFSET (Pm1bEventBlock), 107 ACPI_FADT_OFFSET (Pm1EventLength), 108 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ 109 ACPI_FADT_OPTIONAL}, 110 111 {"Pm1aControlBlock", 112 ACPI_FADT_OFFSET (XPm1aControlBlock), 113 ACPI_FADT_OFFSET (Pm1aControlBlock), 114 ACPI_FADT_OFFSET (Pm1ControlLength), 115 ACPI_PM1_REGISTER_WIDTH, 116 ACPI_FADT_REQUIRED}, 117 118 {"Pm1bControlBlock", 119 ACPI_FADT_OFFSET (XPm1bControlBlock), 120 ACPI_FADT_OFFSET (Pm1bControlBlock), 121 ACPI_FADT_OFFSET (Pm1ControlLength), 122 ACPI_PM1_REGISTER_WIDTH, 123 ACPI_FADT_OPTIONAL}, 124 125 {"Pm2ControlBlock", 126 ACPI_FADT_OFFSET (XPm2ControlBlock), 127 ACPI_FADT_OFFSET (Pm2ControlBlock), 128 ACPI_FADT_OFFSET (Pm2ControlLength), 129 ACPI_PM2_REGISTER_WIDTH, 130 ACPI_FADT_SEPARATE_LENGTH}, 131 132 {"PmTimerBlock", 133 ACPI_FADT_OFFSET (XPmTimerBlock), 134 ACPI_FADT_OFFSET (PmTimerBlock), 135 ACPI_FADT_OFFSET (PmTimerLength), 136 ACPI_PM_TIMER_WIDTH, 137 ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */ 138 139 {"Gpe0Block", 140 ACPI_FADT_OFFSET (XGpe0Block), 141 ACPI_FADT_OFFSET (Gpe0Block), 142 ACPI_FADT_OFFSET (Gpe0BlockLength), 143 0, 144 ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}, 145 146 {"Gpe1Block", 147 ACPI_FADT_OFFSET (XGpe1Block), 148 ACPI_FADT_OFFSET (Gpe1Block), 149 ACPI_FADT_OFFSET (Gpe1BlockLength), 150 0, 151 ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER} 152 }; 153 154 #define ACPI_FADT_INFO_ENTRIES \ 155 (sizeof (FadtInfoTable) / sizeof (ACPI_FADT_INFO)) 156 157 158 /* Table used to split Event Blocks into separate status/enable registers */ 159 160 typedef struct acpi_fadt_pm_info 161 { 162 ACPI_GENERIC_ADDRESS *Target; 163 UINT16 Source; 164 UINT8 RegisterNum; 165 166 } ACPI_FADT_PM_INFO; 167 168 static ACPI_FADT_PM_INFO FadtPmInfoTable[] = 169 { 170 {&AcpiGbl_XPm1aStatus, 171 ACPI_FADT_OFFSET (XPm1aEventBlock), 172 0}, 173 174 {&AcpiGbl_XPm1aEnable, 175 ACPI_FADT_OFFSET (XPm1aEventBlock), 176 1}, 177 178 {&AcpiGbl_XPm1bStatus, 179 ACPI_FADT_OFFSET (XPm1bEventBlock), 180 0}, 181 182 {&AcpiGbl_XPm1bEnable, 183 ACPI_FADT_OFFSET (XPm1bEventBlock), 184 1} 185 }; 186 187 #define ACPI_FADT_PM_INFO_ENTRIES \ 188 (sizeof (FadtPmInfoTable) / sizeof (ACPI_FADT_PM_INFO)) 189 190 191 /******************************************************************************* 192 * 193 * FUNCTION: AcpiTbInitGenericAddress 194 * 195 * PARAMETERS: GenericAddress - GAS struct to be initialized 196 * SpaceId - ACPI Space ID for this register 197 * ByteWidth - Width of this register 198 * Address - Address of the register 199 * RegisterName - ASCII name of the ACPI register 200 * 201 * RETURN: None 202 * 203 * DESCRIPTION: Initialize a Generic Address Structure (GAS) 204 * See the ACPI specification for a full description and 205 * definition of this structure. 206 * 207 ******************************************************************************/ 208 209 static void 210 AcpiTbInitGenericAddress ( 211 ACPI_GENERIC_ADDRESS *GenericAddress, 212 UINT8 SpaceId, 213 UINT8 ByteWidth, 214 UINT64 Address, 215 const char *RegisterName, 216 UINT8 Flags) 217 { 218 UINT8 BitWidth; 219 220 221 /* 222 * Bit width field in the GAS is only one byte long, 255 max. 223 * Check for BitWidth overflow in GAS. 224 */ 225 BitWidth = (UINT8) (ByteWidth * 8); 226 if (ByteWidth > 31) /* (31*8)=248, (32*8)=256 */ 227 { 228 /* 229 * No error for GPE blocks, because we do not use the BitWidth 230 * for GPEs, the legacy length (ByteWidth) is used instead to 231 * allow for a large number of GPEs. 232 */ 233 if (!(Flags & ACPI_FADT_GPE_REGISTER)) 234 { 235 ACPI_ERROR ((AE_INFO, 236 "%s - 32-bit FADT register is too long (%u bytes, %u bits) " 237 "to convert to GAS struct - 255 bits max, truncating", 238 RegisterName, ByteWidth, (ByteWidth * 8))); 239 } 240 241 BitWidth = 255; 242 } 243 244 /* 245 * The 64-bit Address field is non-aligned in the byte packed 246 * GAS struct. 247 */ 248 ACPI_MOVE_64_TO_64 (&GenericAddress->Address, &Address); 249 250 /* All other fields are byte-wide */ 251 252 GenericAddress->SpaceId = SpaceId; 253 GenericAddress->BitWidth = BitWidth; 254 GenericAddress->BitOffset = 0; 255 GenericAddress->AccessWidth = 0; /* Access width ANY */ 256 } 257 258 259 /******************************************************************************* 260 * 261 * FUNCTION: AcpiTbSelectAddress 262 * 263 * PARAMETERS: RegisterName - ASCII name of the ACPI register 264 * Address32 - 32-bit address of the register 265 * Address64 - 64-bit address of the register 266 * 267 * RETURN: The resolved 64-bit address 268 * 269 * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within 270 * the FADT. Used for the FACS and DSDT addresses. 271 * 272 * NOTES: 273 * 274 * Check for FACS and DSDT address mismatches. An address mismatch between 275 * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and 276 * DSDT/X_DSDT) could be a corrupted address field or it might indicate 277 * the presence of two FACS or two DSDT tables. 278 * 279 * November 2013: 280 * By default, as per the ACPICA specification, a valid 64-bit address is 281 * used regardless of the value of the 32-bit address. However, this 282 * behavior can be overridden via the AcpiGbl_Use32BitFadtAddresses flag. 283 * 284 ******************************************************************************/ 285 286 static UINT64 287 AcpiTbSelectAddress ( 288 char *RegisterName, 289 UINT32 Address32, 290 UINT64 Address64) 291 { 292 293 if (!Address64) 294 { 295 /* 64-bit address is zero, use 32-bit address */ 296 297 return ((UINT64) Address32); 298 } 299 300 if (Address32 && 301 (Address64 != (UINT64) Address32)) 302 { 303 /* Address mismatch between 32-bit and 64-bit versions */ 304 305 ACPI_BIOS_WARNING ((AE_INFO, 306 "32/64X %s address mismatch in FADT: " 307 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address", 308 RegisterName, Address32, ACPI_FORMAT_UINT64 (Address64), 309 AcpiGbl_Use32BitFadtAddresses ? 32 : 64)); 310 311 /* 32-bit address override */ 312 313 if (AcpiGbl_Use32BitFadtAddresses) 314 { 315 return ((UINT64) Address32); 316 } 317 } 318 319 /* Default is to use the 64-bit address */ 320 321 return (Address64); 322 } 323 324 325 /******************************************************************************* 326 * 327 * FUNCTION: AcpiTbParseFadt 328 * 329 * PARAMETERS: None 330 * 331 * RETURN: None 332 * 333 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables 334 * (FADT contains the addresses of the DSDT and FACS) 335 * 336 ******************************************************************************/ 337 338 void 339 AcpiTbParseFadt ( 340 void) 341 { 342 UINT32 Length; 343 ACPI_TABLE_HEADER *Table; 344 345 346 /* 347 * The FADT has multiple versions with different lengths, 348 * and it contains pointers to both the DSDT and FACS tables. 349 * 350 * Get a local copy of the FADT and convert it to a common format 351 * Map entire FADT, assumed to be smaller than one page. 352 */ 353 Length = AcpiGbl_RootTableList.Tables[AcpiGbl_FadtIndex].Length; 354 355 Table = AcpiOsMapMemory ( 356 AcpiGbl_RootTableList.Tables[AcpiGbl_FadtIndex].Address, Length); 357 if (!Table) 358 { 359 return; 360 } 361 362 /* 363 * Validate the FADT checksum before we copy the table. Ignore 364 * checksum error as we want to try to get the DSDT and FACS. 365 */ 366 (void) AcpiTbVerifyChecksum (Table, Length); 367 368 /* Create a local copy of the FADT in common ACPI 2.0+ format */ 369 370 AcpiTbCreateLocalFadt (Table, Length); 371 372 /* All done with the real FADT, unmap it */ 373 374 AcpiOsUnmapMemory (Table, Length); 375 376 /* Obtain the DSDT and FACS tables via their addresses within the FADT */ 377 378 AcpiTbInstallFixedTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XDsdt, 379 ACPI_SIG_DSDT, &AcpiGbl_DsdtIndex); 380 381 /* If Hardware Reduced flag is set, there is no FACS */ 382 383 if (!AcpiGbl_ReducedHardware) 384 { 385 if (AcpiGbl_FADT.Facs) 386 { 387 AcpiTbInstallFixedTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.Facs, 388 ACPI_SIG_FACS, &AcpiGbl_FacsIndex); 389 } 390 if (AcpiGbl_FADT.XFacs) 391 { 392 AcpiTbInstallFixedTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XFacs, 393 ACPI_SIG_FACS, &AcpiGbl_XFacsIndex); 394 } 395 } 396 } 397 398 399 /******************************************************************************* 400 * 401 * FUNCTION: AcpiTbCreateLocalFadt 402 * 403 * PARAMETERS: Table - Pointer to BIOS FADT 404 * Length - Length of the table 405 * 406 * RETURN: None 407 * 408 * DESCRIPTION: Get a local copy of the FADT and convert it to a common format. 409 * Performs validation on some important FADT fields. 410 * 411 * NOTE: We create a local copy of the FADT regardless of the version. 412 * 413 ******************************************************************************/ 414 415 void 416 AcpiTbCreateLocalFadt ( 417 ACPI_TABLE_HEADER *Table, 418 UINT32 Length) 419 { 420 421 /* 422 * Check if the FADT is larger than the largest table that we expect 423 * (typically the current ACPI specification version). If so, truncate 424 * the table, and issue a warning. 425 */ 426 if (Length > sizeof (ACPI_TABLE_FADT)) 427 { 428 ACPI_BIOS_WARNING ((AE_INFO, 429 "FADT (revision %u) is longer than %s length, " 430 "truncating length %u to %u", 431 Table->Revision, ACPI_FADT_CONFORMANCE, Length, 432 (UINT32) sizeof (ACPI_TABLE_FADT))); 433 } 434 435 /* Clear the entire local FADT */ 436 437 memset (&AcpiGbl_FADT, 0, sizeof (ACPI_TABLE_FADT)); 438 439 /* Copy the original FADT, up to sizeof (ACPI_TABLE_FADT) */ 440 441 memcpy (&AcpiGbl_FADT, Table, 442 ACPI_MIN (Length, sizeof (ACPI_TABLE_FADT))); 443 444 /* Take a copy of the Hardware Reduced flag */ 445 446 AcpiGbl_ReducedHardware = FALSE; 447 if (AcpiGbl_FADT.Flags & ACPI_FADT_HW_REDUCED) 448 { 449 AcpiGbl_ReducedHardware = TRUE; 450 } 451 452 /* Convert the local copy of the FADT to the common internal format */ 453 454 AcpiTbConvertFadt (); 455 456 /* Initialize the global ACPI register structures */ 457 458 AcpiTbSetupFadtRegisters (); 459 } 460 461 462 /******************************************************************************* 463 * 464 * FUNCTION: AcpiTbConvertFadt 465 * 466 * PARAMETERS: None - AcpiGbl_FADT is used. 467 * 468 * RETURN: None 469 * 470 * DESCRIPTION: Converts all versions of the FADT to a common internal format. 471 * Expand 32-bit addresses to 64-bit as necessary. Also validate 472 * important fields within the FADT. 473 * 474 * NOTE: AcpiGbl_FADT must be of size (ACPI_TABLE_FADT), and must 475 * contain a copy of the actual BIOS-provided FADT. 476 * 477 * Notes on 64-bit register addresses: 478 * 479 * After this FADT conversion, later ACPICA code will only use the 64-bit "X" 480 * fields of the FADT for all ACPI register addresses. 481 * 482 * The 64-bit X fields are optional extensions to the original 32-bit FADT 483 * V1.0 fields. Even if they are present in the FADT, they are optional and 484 * are unused if the BIOS sets them to zero. Therefore, we must copy/expand 485 * 32-bit V1.0 fields to the 64-bit X fields if the the 64-bit X field is 486 * originally zero. 487 * 488 * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address 489 * fields are expanded to the corresponding 64-bit X fields in the internal 490 * common FADT. 491 * 492 * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded 493 * to the corresponding 64-bit X fields, if the 64-bit field is originally 494 * zero. Adhering to the ACPI specification, we completely ignore the 32-bit 495 * field if the 64-bit field is valid, regardless of whether the host OS is 496 * 32-bit or 64-bit. 497 * 498 * Possible additional checks: 499 * (AcpiGbl_FADT.Pm1EventLength >= 4) 500 * (AcpiGbl_FADT.Pm1ControlLength >= 2) 501 * (AcpiGbl_FADT.PmTimerLength >= 4) 502 * Gpe block lengths must be multiple of 2 503 * 504 ******************************************************************************/ 505 506 static void 507 AcpiTbConvertFadt ( 508 void) 509 { 510 const char *Name; 511 ACPI_GENERIC_ADDRESS *Address64; 512 UINT32 Address32; 513 UINT8 Length; 514 UINT8 Flags; 515 UINT32 i; 516 517 518 /* 519 * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which 520 * should be zero are indeed zero. This will workaround BIOSs that 521 * inadvertently place values in these fields. 522 * 523 * The ACPI 1.0 reserved fields that will be zeroed are the bytes located 524 * at offset 45, 55, 95, and the word located at offset 109, 110. 525 * 526 * Note: The FADT revision value is unreliable. Only the length can be 527 * trusted. 528 */ 529 if (AcpiGbl_FADT.Header.Length <= ACPI_FADT_V2_SIZE) 530 { 531 AcpiGbl_FADT.PreferredProfile = 0; 532 AcpiGbl_FADT.PstateControl = 0; 533 AcpiGbl_FADT.CstControl = 0; 534 AcpiGbl_FADT.BootFlags = 0; 535 } 536 537 /* 538 * Now we can update the local FADT length to the length of the 539 * current FADT version as defined by the ACPI specification. 540 * Thus, we will have a common FADT internally. 541 */ 542 AcpiGbl_FADT.Header.Length = sizeof (ACPI_TABLE_FADT); 543 544 /* 545 * Expand the 32-bit DSDT addresses to 64-bit as necessary. 546 * Later ACPICA code will always use the X 64-bit field. 547 */ 548 AcpiGbl_FADT.XDsdt = AcpiTbSelectAddress ("DSDT", 549 AcpiGbl_FADT.Dsdt, AcpiGbl_FADT.XDsdt); 550 551 /* If Hardware Reduced flag is set, we are all done */ 552 553 if (AcpiGbl_ReducedHardware) 554 { 555 return; 556 } 557 558 /* Examine all of the 64-bit extended address fields (X fields) */ 559 560 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) 561 { 562 /* 563 * Get the 32-bit and 64-bit addresses, as well as the register 564 * length and register name. 565 */ 566 Address32 = *ACPI_ADD_PTR (UINT32, 567 &AcpiGbl_FADT, FadtInfoTable[i].Address32); 568 569 Address64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, 570 &AcpiGbl_FADT, FadtInfoTable[i].Address64); 571 572 Length = *ACPI_ADD_PTR (UINT8, 573 &AcpiGbl_FADT, FadtInfoTable[i].Length); 574 575 Name = FadtInfoTable[i].Name; 576 Flags = FadtInfoTable[i].Flags; 577 578 /* 579 * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X" 580 * generic address structures as necessary. Later code will always use 581 * the 64-bit address structures. 582 * 583 * November 2013: 584 * Now always use the 64-bit address if it is valid (non-zero), in 585 * accordance with the ACPI specification which states that a 64-bit 586 * address supersedes the 32-bit version. This behavior can be 587 * overridden by the AcpiGbl_Use32BitFadtAddresses flag. 588 * 589 * During 64-bit address construction and verification, 590 * these cases are handled: 591 * 592 * Address32 zero, Address64 [don't care] - Use Address64 593 * 594 * Address32 non-zero, Address64 zero - Copy/use Address32 595 * Address32 non-zero == Address64 non-zero - Use Address64 596 * Address32 non-zero != Address64 non-zero - Warning, use Address64 597 * 598 * Override: if AcpiGbl_Use32BitFadtAddresses is TRUE, and: 599 * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32 600 * 601 * Note: SpaceId is always I/O for 32-bit legacy address fields 602 */ 603 if (Address32) 604 { 605 if (!Address64->Address) 606 { 607 /* 64-bit address is zero, use 32-bit address */ 608 609 AcpiTbInitGenericAddress (Address64, 610 ACPI_ADR_SPACE_SYSTEM_IO, 611 *ACPI_ADD_PTR (UINT8, &AcpiGbl_FADT, 612 FadtInfoTable[i].Length), 613 (UINT64) Address32, Name, Flags); 614 } 615 else if (Address64->Address != (UINT64) Address32) 616 { 617 /* Address mismatch */ 618 619 ACPI_BIOS_WARNING ((AE_INFO, 620 "32/64X address mismatch in FADT/%s: " 621 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address", 622 Name, Address32, 623 ACPI_FORMAT_UINT64 (Address64->Address), 624 AcpiGbl_Use32BitFadtAddresses ? 32 : 64)); 625 626 if (AcpiGbl_Use32BitFadtAddresses) 627 { 628 /* 32-bit address override */ 629 630 AcpiTbInitGenericAddress (Address64, 631 ACPI_ADR_SPACE_SYSTEM_IO, 632 *ACPI_ADD_PTR (UINT8, &AcpiGbl_FADT, 633 FadtInfoTable[i].Length), 634 (UINT64) Address32, Name, Flags); 635 } 636 } 637 } 638 639 /* 640 * For each extended field, check for length mismatch between the 641 * legacy length field and the corresponding 64-bit X length field. 642 * Note: If the legacy length field is > 0xFF bits, ignore this 643 * check. (GPE registers can be larger than the 64-bit GAS structure 644 * can accomodate, 0xFF bits). 645 */ 646 if (Address64->Address && 647 (ACPI_MUL_8 (Length) <= ACPI_UINT8_MAX) && 648 (Address64->BitWidth != ACPI_MUL_8 (Length))) 649 { 650 ACPI_BIOS_WARNING ((AE_INFO, 651 "32/64X length mismatch in FADT/%s: %u/%u", 652 Name, ACPI_MUL_8 (Length), Address64->BitWidth)); 653 } 654 655 if (FadtInfoTable[i].Flags & ACPI_FADT_REQUIRED) 656 { 657 /* 658 * Field is required (PM1aEvent, PM1aControl). 659 * Both the address and length must be non-zero. 660 */ 661 if (!Address64->Address || !Length) 662 { 663 ACPI_BIOS_ERROR ((AE_INFO, 664 "Required FADT field %s has zero address and/or length: " 665 "0x%8.8X%8.8X/0x%X", 666 Name, ACPI_FORMAT_UINT64 (Address64->Address), Length)); 667 } 668 } 669 else if (FadtInfoTable[i].Flags & ACPI_FADT_SEPARATE_LENGTH) 670 { 671 /* 672 * Field is optional (PM2Control, GPE0, GPE1) AND has its own 673 * length field. If present, both the address and length must 674 * be valid. 675 */ 676 if ((Address64->Address && !Length) || 677 (!Address64->Address && Length)) 678 { 679 ACPI_BIOS_WARNING ((AE_INFO, 680 "Optional FADT field %s has valid %s but zero %s: " 681 "0x%8.8X%8.8X/0x%X", Name, 682 (Length ? "Length" : "Address"), 683 (Length ? "Address": "Length"), 684 ACPI_FORMAT_UINT64 (Address64->Address), Length)); 685 } 686 } 687 } 688 } 689 690 691 /******************************************************************************* 692 * 693 * FUNCTION: AcpiTbSetupFadtRegisters 694 * 695 * PARAMETERS: None, uses AcpiGbl_FADT. 696 * 697 * RETURN: None 698 * 699 * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally, 700 * force FADT register definitions to their default lengths. 701 * 702 ******************************************************************************/ 703 704 static void 705 AcpiTbSetupFadtRegisters ( 706 void) 707 { 708 ACPI_GENERIC_ADDRESS *Target64; 709 ACPI_GENERIC_ADDRESS *Source64; 710 UINT8 Pm1RegisterByteWidth; 711 UINT32 i; 712 713 714 /* 715 * Optionally check all register lengths against the default values and 716 * update them if they are incorrect. 717 */ 718 if (AcpiGbl_UseDefaultRegisterWidths) 719 { 720 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) 721 { 722 Target64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT, 723 FadtInfoTable[i].Address64); 724 725 /* 726 * If a valid register (Address != 0) and the (DefaultLength > 0) 727 * (Not a GPE register), then check the width against the default. 728 */ 729 if ((Target64->Address) && 730 (FadtInfoTable[i].DefaultLength > 0) && 731 (FadtInfoTable[i].DefaultLength != Target64->BitWidth)) 732 { 733 ACPI_BIOS_WARNING ((AE_INFO, 734 "Invalid length for FADT/%s: %u, using default %u", 735 FadtInfoTable[i].Name, Target64->BitWidth, 736 FadtInfoTable[i].DefaultLength)); 737 738 /* Incorrect size, set width to the default */ 739 740 Target64->BitWidth = FadtInfoTable[i].DefaultLength; 741 } 742 } 743 } 744 745 /* 746 * Get the length of the individual PM1 registers (enable and status). 747 * Each register is defined to be (event block length / 2). Extra divide 748 * by 8 converts bits to bytes. 749 */ 750 Pm1RegisterByteWidth = (UINT8) 751 ACPI_DIV_16 (AcpiGbl_FADT.XPm1aEventBlock.BitWidth); 752 753 /* 754 * Calculate separate GAS structs for the PM1x (A/B) Status and Enable 755 * registers. These addresses do not appear (directly) in the FADT, so it 756 * is useful to pre-calculate them from the PM1 Event Block definitions. 757 * 758 * The PM event blocks are split into two register blocks, first is the 759 * PM Status Register block, followed immediately by the PM Enable 760 * Register block. Each is of length (Pm1EventLength/2) 761 * 762 * Note: The PM1A event block is required by the ACPI specification. 763 * However, the PM1B event block is optional and is rarely, if ever, 764 * used. 765 */ 766 767 for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) 768 { 769 Source64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT, 770 FadtPmInfoTable[i].Source); 771 772 if (Source64->Address) 773 { 774 AcpiTbInitGenericAddress (FadtPmInfoTable[i].Target, 775 Source64->SpaceId, Pm1RegisterByteWidth, 776 Source64->Address + 777 (FadtPmInfoTable[i].RegisterNum * Pm1RegisterByteWidth), 778 "PmRegisters", 0); 779 } 780 } 781 } 782