1 /*++ 2 3 Copyright (c) 2004 - 2006, Intel Corporation. All rights reserved.<BR> 4 This program and the accompanying materials 5 are licensed and made available under the terms and conditions of the BSD License 6 which accompanies this distribution. The full text of the license may be found at 7 http://opensource.org/licenses/bsd-license.php 8 9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 12 13 Module Name: 14 15 BaseLibInternals.h 16 17 Abstract: 18 19 Declaration of internal functions in BaseLib. 20 21 --*/ 22 23 #ifndef __BASE_LIB_INTERNALS_H__ 24 #define __BASE_LIB_INTERNALS_H__ 25 26 #include "EdkIIGlueBase.h" 27 28 #define QUIENT_MAX_UINTN_DIVIDED_BY_10 ((UINTN) -1 / 10) 29 #define REMINDER_MAX_UINTN_DIVIDED_BY_10 ((UINTN) -1 % 10) 30 31 #define QUIENT_MAX_UINTN_DIVIDED_BY_16 ((UINTN) -1 / 16) 32 #define REMINDER_MAX_UINTN_DIVIDED_BY_16 ((UINTN) -1 % 16) 33 34 #define QUIENT_MAX_UINT64_DIVIDED_BY_10 ((UINT64) -1 / 10) 35 #define REMINDER_MAX_UINT64_DIVIDED_BY_10 ((UINT64) -1 % 10) 36 37 #define QUIENT_MAX_UINT64_DIVIDED_BY_16 ((UINT64) -1 / 16) 38 #define REMINDER_MAX_UINT64_DIVIDED_BY_16 ((UINT64) -1 % 16) 39 40 // 41 // Math functions 42 // 43 44 /** 45 Shifts a 64-bit integer left between 0 and 63 bits. The low bits 46 are filled with zeros. The shifted value is returned. 47 48 This function shifts the 64-bit value Operand to the left by Count bits. The 49 low Count bits are set to zero. The shifted value is returned. 50 51 @param Operand The 64-bit operand to shift left. 52 @param Count The number of bits to shift left. 53 54 @return Operand << Count 55 56 **/ 57 UINT64 58 EFIAPI 59 InternalMathLShiftU64 ( 60 IN UINT64 Operand, 61 IN UINTN Count 62 ); 63 64 /** 65 Shifts a 64-bit integer right between 0 and 63 bits. This high bits 66 are filled with zeros. The shifted value is returned. 67 68 This function shifts the 64-bit value Operand to the right by Count bits. The 69 high Count bits are set to zero. The shifted value is returned. 70 71 @param Operand The 64-bit operand to shift right. 72 @param Count The number of bits to shift right. 73 74 @return Operand >> Count 75 76 **/ 77 UINT64 78 EFIAPI 79 InternalMathRShiftU64 ( 80 IN UINT64 Operand, 81 IN UINTN Count 82 ); 83 84 /** 85 Shifts a 64-bit integer right between 0 and 63 bits. The high bits 86 are filled with original integer's bit 63. The shifted value is returned. 87 88 This function shifts the 64-bit value Operand to the right by Count bits. The 89 high Count bits are set to bit 63 of Operand. The shifted value is returned. 90 91 @param Operand The 64-bit operand to shift right. 92 @param Count The number of bits to shift right. 93 94 @return Operand arithmetically shifted right by Count 95 96 **/ 97 UINT64 98 EFIAPI 99 InternalMathARShiftU64 ( 100 IN UINT64 Operand, 101 IN UINTN Count 102 ); 103 104 /** 105 Rotates a 64-bit integer left between 0 and 63 bits, filling 106 the low bits with the high bits that were rotated. 107 108 This function rotates the 64-bit value Operand to the left by Count bits. The 109 low Count bits are fill with the high Count bits of Operand. The rotated 110 value is returned. 111 112 @param Operand The 64-bit operand to rotate left. 113 @param Count The number of bits to rotate left. 114 115 @return Operand <<< Count 116 117 **/ 118 UINT64 119 EFIAPI 120 InternalMathLRotU64 ( 121 IN UINT64 Operand, 122 IN UINTN Count 123 ); 124 125 /** 126 Rotates a 64-bit integer right between 0 and 63 bits, filling 127 the high bits with the high low bits that were rotated. 128 129 This function rotates the 64-bit value Operand to the right by Count bits. 130 The high Count bits are fill with the low Count bits of Operand. The rotated 131 value is returned. 132 133 @param Operand The 64-bit operand to rotate right. 134 @param Count The number of bits to rotate right. 135 136 @return Operand >>> Count 137 138 **/ 139 UINT64 140 EFIAPI 141 InternalMathRRotU64 ( 142 IN UINT64 Operand, 143 IN UINTN Count 144 ); 145 146 /** 147 Switches the endianess of a 64-bit integer. 148 149 This function swaps the bytes in a 64-bit unsigned value to switch the value 150 from little endian to big endian or vice versa. The byte swapped value is 151 returned. 152 153 @param Operand A 64-bit unsigned value. 154 155 @return The byte swaped Operand. 156 157 **/ 158 UINT64 159 EFIAPI 160 InternalMathSwapBytes64 ( 161 IN UINT64 Operand 162 ); 163 164 /** 165 Multiples a 64-bit unsigned integer by a 32-bit unsigned integer 166 and generates a 64-bit unsigned result. 167 168 This function multiples the 64-bit unsigned value Multiplicand by the 32-bit 169 unsigned value Multiplier and generates a 64-bit unsigned result. This 64- 170 bit unsigned result is returned. 171 172 @param Multiplicand A 64-bit unsigned value. 173 @param Multiplier A 32-bit unsigned value. 174 175 @return Multiplicand * Multiplier 176 177 **/ 178 UINT64 179 EFIAPI 180 InternalMathMultU64x32 ( 181 IN UINT64 Multiplicand, 182 IN UINT32 Multiplier 183 ); 184 185 /** 186 Multiples a 64-bit unsigned integer by a 64-bit unsigned integer 187 and generates a 64-bit unsigned result. 188 189 This function multiples the 64-bit unsigned value Multiplicand by the 64-bit 190 unsigned value Multiplier and generates a 64-bit unsigned result. This 64- 191 bit unsigned result is returned. 192 193 @param Multiplicand A 64-bit unsigned value. 194 @param Multiplier A 64-bit unsigned value. 195 196 @return Multiplicand * Multiplier 197 198 **/ 199 UINT64 200 EFIAPI 201 InternalMathMultU64x64 ( 202 IN UINT64 Multiplicand, 203 IN UINT64 Multiplier 204 ); 205 206 /** 207 Divides a 64-bit unsigned integer by a 32-bit unsigned integer and 208 generates a 64-bit unsigned result. 209 210 This function divides the 64-bit unsigned value Dividend by the 32-bit 211 unsigned value Divisor and generates a 64-bit unsigned quotient. This 212 function returns the 64-bit unsigned quotient. 213 214 @param Dividend A 64-bit unsigned value. 215 @param Divisor A 32-bit unsigned value. 216 217 @return Dividend / Divisor 218 219 **/ 220 UINT64 221 EFIAPI 222 InternalMathDivU64x32 ( 223 IN UINT64 Dividend, 224 IN UINT32 Divisor 225 ); 226 227 /** 228 Divides a 64-bit unsigned integer by a 32-bit unsigned integer and 229 generates a 32-bit unsigned remainder. 230 231 This function divides the 64-bit unsigned value Dividend by the 32-bit 232 unsigned value Divisor and generates a 32-bit remainder. This function 233 returns the 32-bit unsigned remainder. 234 235 @param Dividend A 64-bit unsigned value. 236 @param Divisor A 32-bit unsigned value. 237 238 @return Dividend % Divisor 239 240 **/ 241 UINT32 242 EFIAPI 243 InternalMathModU64x32 ( 244 IN UINT64 Dividend, 245 IN UINT32 Divisor 246 ); 247 248 /** 249 Divides a 64-bit unsigned integer by a 32-bit unsigned integer and 250 generates a 64-bit unsigned result and an optional 32-bit unsigned remainder. 251 252 This function divides the 64-bit unsigned value Dividend by the 32-bit 253 unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder 254 is not NULL, then the 32-bit unsigned remainder is returned in Remainder. 255 This function returns the 64-bit unsigned quotient. 256 257 @param Dividend A 64-bit unsigned value. 258 @param Divisor A 32-bit unsigned value. 259 @param Remainder A pointer to a 32-bit unsigned value. This parameter is 260 optional and may be NULL. 261 262 @return Dividend / Divisor 263 264 **/ 265 UINT64 266 EFIAPI 267 InternalMathDivRemU64x32 ( 268 IN UINT64 Dividend, 269 IN UINT32 Divisor, 270 OUT UINT32 *Remainder 271 ); 272 273 /** 274 Divides a 64-bit unsigned integer by a 64-bit unsigned integer and 275 generates a 64-bit unsigned result and an optional 64-bit unsigned remainder. 276 277 This function divides the 64-bit unsigned value Dividend by the 64-bit 278 unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder 279 is not NULL, then the 64-bit unsigned remainder is returned in Remainder. 280 This function returns the 64-bit unsigned quotient. 281 282 @param Dividend A 64-bit unsigned value. 283 @param Divisor A 64-bit unsigned value. 284 @param Remainder A pointer to a 64-bit unsigned value. This parameter is 285 optional and may be NULL. 286 287 @return Dividend / Divisor 288 289 **/ 290 UINT64 291 EFIAPI 292 InternalMathDivRemU64x64 ( 293 IN UINT64 Dividend, 294 IN UINT64 Divisor, 295 OUT UINT64 *Remainder 296 ); 297 298 /** 299 Divides a 64-bit signed integer by a 64-bit signed integer and 300 generates a 64-bit signed result and a optional 64-bit signed remainder. 301 302 This function divides the 64-bit unsigned value Dividend by the 64-bit 303 unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder 304 is not NULL, then the 64-bit unsigned remainder is returned in Remainder. 305 This function returns the 64-bit unsigned quotient. 306 307 @param Dividend A 64-bit signed value. 308 @param Divisor A 64-bit signed value. 309 @param Remainder A pointer to a 64-bit signed value. This parameter is 310 optional and may be NULL. 311 312 @return Dividend / Divisor 313 314 **/ 315 INT64 316 InternalMathDivRemS64x64 ( 317 IN INT64 Dividend, 318 IN INT64 Divisor, 319 OUT INT64 *Remainder OPTIONAL 320 ); 321 322 /** 323 Transfers control to a function starting with a new stack. 324 325 Transfers control to the function specified by EntryPoint using the 326 new stack specified by NewStack and passing in the parameters specified 327 by Context1 and Context2. Context1 and Context2 are optional and may 328 be NULL. The function EntryPoint must never return. 329 Marker will be ignored on IA-32, x64, and EBC. 330 IPF CPUs expect one additional parameter of type VOID * that specifies 331 the new backing store pointer. 332 333 If EntryPoint is NULL, then ASSERT(). 334 If NewStack is NULL, then ASSERT(). 335 336 @param EntryPoint A pointer to function to call with the new stack. 337 @param Context1 A pointer to the context to pass into the EntryPoint 338 function. 339 @param Context2 A pointer to the context to pass into the EntryPoint 340 function. 341 @param NewStack A pointer to the new stack to use for the EntryPoint 342 function. 343 @param Marker VA_LIST marker for the variable argument list. 344 345 **/ 346 VOID 347 EFIAPI 348 InternalSwitchStack ( 349 IN SWITCH_STACK_ENTRY_POINT EntryPoint, 350 IN VOID *Context1, OPTIONAL 351 IN VOID *Context2, OPTIONAL 352 IN VOID *NewStack, 353 IN VA_LIST Marker 354 ); 355 356 357 /** 358 Worker function that locates the Node in the List 359 360 By searching the List, finds the location of the Node in List. At the same time, 361 verifies the validity of this list. 362 363 If List is NULL, then ASSERT(). 364 If List->ForwardLink is NULL, then ASSERT(). 365 If List->backLink is NULL, then ASSERT(). 366 If Node is NULL, then ASSERT(); 367 If PcdMaximumLinkedListLenth is not zero, and prior to insertion the number 368 of nodes in ListHead, including the ListHead node, is greater than or 369 equal to PcdMaximumLinkedListLength, then ASSERT(). 370 371 @param List A pointer to a node in a linked list. 372 @param Node A pointer to one nod. 373 374 @retval TRUE Node is in List 375 @retval FALSE Node isn't in List, or List is invalid 376 377 **/ 378 BOOLEAN 379 IsNodeInList ( 380 IN CONST LIST_ENTRY *List, 381 IN CONST LIST_ENTRY *Node 382 ); 383 384 385 /** 386 Performs an atomic increment of an 32-bit unsigned integer. 387 388 Performs an atomic increment of the 32-bit unsigned integer specified by 389 Value and returns the incremented value. The increment operation must be 390 performed using MP safe mechanisms. The state of the return value is not 391 guaranteed to be MP safe. 392 393 @param Value A pointer to the 32-bit value to increment. 394 395 @return The incremented value. 396 397 **/ 398 UINT32 399 EFIAPI 400 InternalSyncIncrement ( 401 IN volatile UINT32 *Value 402 ); 403 404 405 /** 406 Performs an atomic decrement of an 32-bit unsigned integer. 407 408 Performs an atomic decrement of the 32-bit unsigned integer specified by 409 Value and returns the decrement value. The decrement operation must be 410 performed using MP safe mechanisms. The state of the return value is not 411 guaranteed to be MP safe. 412 413 @param Value A pointer to the 32-bit value to decrement. 414 415 @return The decrement value. 416 417 **/ 418 UINT32 419 EFIAPI 420 InternalSyncDecrement ( 421 IN volatile UINT32 *Value 422 ); 423 424 425 /** 426 Performs an atomic compare exchange operation on a 32-bit unsigned integer. 427 428 Performs an atomic compare exchange operation on the 32-bit unsigned integer 429 specified by Value. If Value is equal to CompareValue, then Value is set to 430 ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue, 431 then Value is returned. The compare exchange operation must be performed using 432 MP safe mechanisms. 433 434 @param Value A pointer to the 32-bit value for the compare exchange 435 operation. 436 @param CompareValue 32-bit value used in compare operation. 437 @param ExchangeValue 32-bit value used in exchange operation. 438 439 @return The original *Value before exchange. 440 441 **/ 442 UINT32 443 EFIAPI 444 InternalSyncCompareExchange32 ( 445 IN volatile UINT32 *Value, 446 IN UINT32 CompareValue, 447 IN UINT32 ExchangeValue 448 ); 449 450 451 /** 452 Performs an atomic compare exchange operation on a 64-bit unsigned integer. 453 454 Performs an atomic compare exchange operation on the 64-bit unsigned integer specified 455 by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and 456 CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. 457 The compare exchange operation must be performed using MP safe mechanisms. 458 459 @param Value A pointer to the 64-bit value for the compare exchange 460 operation. 461 @param CompareValue 64-bit value used in compare operation. 462 @param ExchangeValue 64-bit value used in exchange operation. 463 464 @return The original *Value before exchange. 465 466 **/ 467 UINT64 468 EFIAPI 469 InternalSyncCompareExchange64 ( 470 IN volatile UINT64 *Value, 471 IN UINT64 CompareValue, 472 IN UINT64 ExchangeValue 473 ); 474 475 476 /** 477 Worker function that returns a bit field from Operand 478 479 Returns the bitfield specified by the StartBit and the EndBit from Operand. 480 481 @param Operand Operand on which to perform the bitfield operation. 482 @param StartBit The ordinal of the least significant bit in the bit field. 483 @param EndBit The ordinal of the most significant bit in the bit field. 484 485 @return The bit field read. 486 487 **/ 488 unsigned int 489 BitFieldReadUint ( 490 IN unsigned int Operand, 491 IN UINTN StartBit, 492 IN UINTN EndBit 493 ); 494 495 496 /** 497 Worker function that reads a bit field from Operand, performs a bitwise OR, 498 and returns the result. 499 500 Performs a bitwise OR between the bit field specified by StartBit and EndBit 501 in Operand and the value specified by AndData. All other bits in Operand are 502 preserved. The new value is returned. 503 504 @param Operand Operand on which to perform the bitfield operation. 505 @param StartBit The ordinal of the least significant bit in the bit field. 506 @param EndBit The ordinal of the most significant bit in the bit field. 507 @param OrData The value to OR with the read value from the value 508 509 @return The new value. 510 511 **/ 512 unsigned int 513 BitFieldOrUint ( 514 IN unsigned int Operand, 515 IN UINTN StartBit, 516 IN UINTN EndBit, 517 IN unsigned int OrData 518 ); 519 520 521 /** 522 Worker function that reads a bit field from Operand, performs a bitwise AND, 523 and returns the result. 524 525 Performs a bitwise AND between the bit field specified by StartBit and EndBit 526 in Operand and the value specified by AndData. All other bits in Operand are 527 preserved. The new value is returned. 528 529 @param Operand Operand on which to perform the bitfield operation. 530 @param StartBit The ordinal of the least significant bit in the bit field. 531 @param EndBit The ordinal of the most significant bit in the bit field. 532 @param AndData The value to And with the read value from the value 533 534 @return The new value. 535 536 **/ 537 unsigned int 538 BitFieldAndUint ( 539 IN unsigned int Operand, 540 IN UINTN StartBit, 541 IN UINTN EndBit, 542 IN unsigned int AndData 543 ); 544 545 546 /** 547 Worker function that checks ASSERT condition for JumpBuffer 548 549 Checks ASSERT condition for JumpBuffer. 550 551 If JumpBuffer is NULL, then ASSERT(). 552 For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT(). 553 554 @param JumpBuffer A pointer to CPU context buffer. 555 556 **/ 557 VOID 558 EFIAPI 559 InternalAssertJumpBuffer ( 560 IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer 561 ); 562 563 564 /** 565 Restores the CPU context that was saved with SetJump(). 566 567 Restores the CPU context from the buffer specified by JumpBuffer. 568 This function never returns to the caller. 569 Instead is resumes execution based on the state of JumpBuffer. 570 571 @param JumpBuffer A pointer to CPU context buffer. 572 @param Value The value to return when the SetJump() context is restored. 573 574 **/ 575 VOID 576 EFIAPI 577 InternalLongJump ( 578 IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer, 579 IN UINTN Value 580 ); 581 582 583 // 584 // Ia32 and x64 specific functions 585 // 586 #if defined (MDE_CPU_IA32) || defined (MDE_CPU_X64) 587 588 /** 589 Reads the current Global Descriptor Table Register(GDTR) descriptor. 590 591 Reads and returns the current GDTR descriptor and returns it in Gdtr. This 592 function is only available on IA-32 and X64. 593 594 @param Gdtr Pointer to a GDTR descriptor. 595 596 **/ 597 VOID 598 EFIAPI 599 InternalX86ReadGdtr ( 600 OUT IA32_DESCRIPTOR *Gdtr 601 ); 602 603 /** 604 Writes the current Global Descriptor Table Register (GDTR) descriptor. 605 606 Writes and the current GDTR descriptor specified by Gdtr. This function is 607 only available on IA-32 and X64. 608 609 @param Gdtr Pointer to a GDTR descriptor. 610 611 **/ 612 VOID 613 EFIAPI 614 InternalX86WriteGdtr ( 615 IN CONST IA32_DESCRIPTOR *Gdtr 616 ); 617 618 /** 619 Reads the current Interrupt Descriptor Table Register(GDTR) descriptor. 620 621 Reads and returns the current IDTR descriptor and returns it in Idtr. This 622 function is only available on IA-32 and X64. 623 624 @param Idtr Pointer to a IDTR descriptor. 625 626 **/ 627 VOID 628 EFIAPI 629 InternalX86ReadIdtr ( 630 OUT IA32_DESCRIPTOR *Idtr 631 ); 632 633 /** 634 Writes the current Interrupt Descriptor Table Register(GDTR) descriptor. 635 636 Writes the current IDTR descriptor and returns it in Idtr. This function is 637 only available on IA-32 and X64. 638 639 @param Idtr Pointer to a IDTR descriptor. 640 641 **/ 642 VOID 643 EFIAPI 644 InternalX86WriteIdtr ( 645 IN CONST IA32_DESCRIPTOR *Idtr 646 ); 647 648 /** 649 Save the current floating point/SSE/SSE2 context to a buffer. 650 651 Saves the current floating point/SSE/SSE2 state to the buffer specified by 652 Buffer. Buffer must be aligned on a 16-byte boundary. This function is only 653 available on IA-32 and X64. 654 655 @param Buffer Pointer to a buffer to save the floating point/SSE/SSE2 context. 656 657 **/ 658 VOID 659 EFIAPI 660 InternalX86FxSave ( 661 OUT IA32_FX_BUFFER *Buffer 662 ); 663 664 /** 665 Restores the current floating point/SSE/SSE2 context from a buffer. 666 667 Restores the current floating point/SSE/SSE2 state from the buffer specified 668 by Buffer. Buffer must be aligned on a 16-byte boundary. This function is 669 only available on IA-32 and X64. 670 671 @param Buffer Pointer to a buffer to save the floating point/SSE/SSE2 context. 672 673 **/ 674 VOID 675 EFIAPI 676 InternalX86FxRestore ( 677 IN CONST IA32_FX_BUFFER *Buffer 678 ); 679 680 /** 681 Enables the 32-bit paging mode on the CPU. 682 683 Enables the 32-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables 684 must be properly initialized prior to calling this service. This function 685 assumes the current execution mode is 32-bit protected mode. This function is 686 only available on IA-32. After the 32-bit paging mode is enabled, control is 687 transferred to the function specified by EntryPoint using the new stack 688 specified by NewStack and passing in the parameters specified by Context1 and 689 Context2. Context1 and Context2 are optional and may be NULL. The function 690 EntryPoint must never return. 691 692 There are a number of constraints that must be followed before calling this 693 function: 694 1) Interrupts must be disabled. 695 2) The caller must be in 32-bit protected mode with flat descriptors. This 696 means all descriptors must have a base of 0 and a limit of 4GB. 697 3) CR0 and CR4 must be compatible with 32-bit protected mode with flat 698 descriptors. 699 4) CR3 must point to valid page tables that will be used once the transition 700 is complete, and those page tables must guarantee that the pages for this 701 function and the stack are identity mapped. 702 703 @param EntryPoint A pointer to function to call with the new stack after 704 paging is enabled. 705 @param Context1 A pointer to the context to pass into the EntryPoint 706 function as the first parameter after paging is enabled. 707 @param Context2 A pointer to the context to pass into the EntryPoint 708 function as the second parameter after paging is enabled. 709 @param NewStack A pointer to the new stack to use for the EntryPoint 710 function after paging is enabled. 711 712 **/ 713 VOID 714 EFIAPI 715 InternalX86EnablePaging32 ( 716 IN SWITCH_STACK_ENTRY_POINT EntryPoint, 717 IN VOID *Context1, OPTIONAL 718 IN VOID *Context2, OPTIONAL 719 IN VOID *NewStack 720 ); 721 722 /** 723 Disables the 32-bit paging mode on the CPU. 724 725 Disables the 32-bit paging mode on the CPU and returns to 32-bit protected 726 mode. This function assumes the current execution mode is 32-paged protected 727 mode. This function is only available on IA-32. After the 32-bit paging mode 728 is disabled, control is transferred to the function specified by EntryPoint 729 using the new stack specified by NewStack and passing in the parameters 730 specified by Context1 and Context2. Context1 and Context2 are optional and 731 may be NULL. The function EntryPoint must never return. 732 733 There are a number of constraints that must be followed before calling this 734 function: 735 1) Interrupts must be disabled. 736 2) The caller must be in 32-bit paged mode. 737 3) CR0, CR3, and CR4 must be compatible with 32-bit paged mode. 738 4) CR3 must point to valid page tables that guarantee that the pages for 739 this function and the stack are identity mapped. 740 741 @param EntryPoint A pointer to function to call with the new stack after 742 paging is disabled. 743 @param Context1 A pointer to the context to pass into the EntryPoint 744 function as the first parameter after paging is disabled. 745 @param Context2 A pointer to the context to pass into the EntryPoint 746 function as the second parameter after paging is 747 disabled. 748 @param NewStack A pointer to the new stack to use for the EntryPoint 749 function after paging is disabled. 750 751 **/ 752 VOID 753 EFIAPI 754 InternalX86DisablePaging32 ( 755 IN SWITCH_STACK_ENTRY_POINT EntryPoint, 756 IN VOID *Context1, OPTIONAL 757 IN VOID *Context2, OPTIONAL 758 IN VOID *NewStack 759 ); 760 761 /** 762 Enables the 64-bit paging mode on the CPU. 763 764 Enables the 64-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables 765 must be properly initialized prior to calling this service. This function 766 assumes the current execution mode is 32-bit protected mode with flat 767 descriptors. This function is only available on IA-32. After the 64-bit 768 paging mode is enabled, control is transferred to the function specified by 769 EntryPoint using the new stack specified by NewStack and passing in the 770 parameters specified by Context1 and Context2. Context1 and Context2 are 771 optional and may be 0. The function EntryPoint must never return. 772 773 @param Cs The 16-bit selector to load in the CS before EntryPoint 774 is called. The descriptor in the GDT that this selector 775 references must be setup for long mode. 776 @param EntryPoint The 64-bit virtual address of the function to call with 777 the new stack after paging is enabled. 778 @param Context1 The 64-bit virtual address of the context to pass into 779 the EntryPoint function as the first parameter after 780 paging is enabled. 781 @param Context2 The 64-bit virtual address of the context to pass into 782 the EntryPoint function as the second parameter after 783 paging is enabled. 784 @param NewStack The 64-bit virtual address of the new stack to use for 785 the EntryPoint function after paging is enabled. 786 787 **/ 788 VOID 789 EFIAPI 790 InternalX86EnablePaging64 ( 791 IN UINT16 Cs, 792 IN UINT64 EntryPoint, 793 IN UINT64 Context1, OPTIONAL 794 IN UINT64 Context2, OPTIONAL 795 IN UINT64 NewStack 796 ); 797 798 /** 799 Disables the 64-bit paging mode on the CPU. 800 801 Disables the 64-bit paging mode on the CPU and returns to 32-bit protected 802 mode. This function assumes the current execution mode is 64-paging mode. 803 This function is only available on X64. After the 64-bit paging mode is 804 disabled, control is transferred to the function specified by EntryPoint 805 using the new stack specified by NewStack and passing in the parameters 806 specified by Context1 and Context2. Context1 and Context2 are optional and 807 may be 0. The function EntryPoint must never return. 808 809 @param Cs The 16-bit selector to load in the CS before EntryPoint 810 is called. The descriptor in the GDT that this selector 811 references must be setup for 32-bit protected mode. 812 @param EntryPoint The 64-bit virtual address of the function to call with 813 the new stack after paging is disabled. 814 @param Context1 The 64-bit virtual address of the context to pass into 815 the EntryPoint function as the first parameter after 816 paging is disabled. 817 @param Context2 The 64-bit virtual address of the context to pass into 818 the EntryPoint function as the second parameter after 819 paging is disabled. 820 @param NewStack The 64-bit virtual address of the new stack to use for 821 the EntryPoint function after paging is disabled. 822 823 **/ 824 VOID 825 EFIAPI 826 InternalX86DisablePaging64 ( 827 IN UINT16 Cs, 828 IN UINT32 EntryPoint, 829 IN UINT32 Context1, OPTIONAL 830 IN UINT32 Context2, OPTIONAL 831 IN UINT32 NewStack 832 ); 833 834 835 #elif defined (MDE_CPU_IPF) 836 // 837 // 838 // IPF specific functions 839 // 840 841 /** 842 Transfers control to a function starting with a new stack. 843 844 Transfers control to the function specified by EntryPoint using the new stack 845 specified by NewStack and passing in the parameters specified by Context1 and 846 Context2. Context1 and Context2 are optional and may be NULL. The function 847 EntryPoint must never return. 848 849 If EntryPoint is NULL, then ASSERT(). 850 If NewStack is NULL, then ASSERT(). 851 852 @param EntryPoint A pointer to function to call with the new stack. 853 @param Context1 A pointer to the context to pass into the EntryPoint 854 function. 855 @param Context2 A pointer to the context to pass into the EntryPoint 856 function. 857 @param NewStack A pointer to the new stack to use for the EntryPoint 858 function. 859 @param NewBsp A pointer to the new memory location for RSE backing 860 store. 861 862 **/ 863 VOID 864 EFIAPI 865 AsmSwitchStackAndBackingStore ( 866 IN SWITCH_STACK_ENTRY_POINT EntryPoint, 867 IN VOID *Context1, OPTIONAL 868 IN VOID *Context2, OPTIONAL 869 IN VOID *NewStack, 870 IN VOID *NewBsp 871 ); 872 #else 873 874 #endif 875 876 #endif 877
