/** @file Memory-only library functions with no library constructor/destructor Copyright (c) 2006, Intel Corporation All rights reserved. This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this distribution. The full text of the license may be found at http://opensource.org/licenses/bsd-license.php THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. Module Name: BaseLib.h **/ #ifndef __BASE_LIB__ #define __BASE_LIB__ // // Definitions for architecture specific types // These include SPIN_LOCK and BASE_LIBRARY_JUMP_BUFFER // // // SPIN_LOCK // typedef UINTN SPIN_LOCK; #if defined (MDE_CPU_IA32) // // IA32 context buffer used by SetJump() and LongJump() // typedef struct { UINT32 Ebx; UINT32 Esi; UINT32 Edi; UINT32 Ebp; UINT32 Esp; UINT32 Eip; } BASE_LIBRARY_JUMP_BUFFER; #elif defined (MDE_CPU_IPF) // // IPF context buffer used by SetJump() and LongJump() // typedef struct { UINT64 F2[2]; UINT64 F3[2]; UINT64 F4[2]; UINT64 F5[2]; UINT64 F16[2]; UINT64 F17[2]; UINT64 F18[2]; UINT64 F19[2]; UINT64 F20[2]; UINT64 F21[2]; UINT64 F22[2]; UINT64 F23[2]; UINT64 F24[2]; UINT64 F25[2]; UINT64 F26[2]; UINT64 F27[2]; UINT64 F28[2]; UINT64 F29[2]; UINT64 F30[2]; UINT64 F31[2]; UINT64 R4; UINT64 R5; UINT64 R6; UINT64 R7; UINT64 SP; UINT64 BR0; UINT64 BR1; UINT64 BR2; UINT64 BR3; UINT64 BR4; UINT64 BR5; UINT64 InitialUNAT; UINT64 AfterSpillUNAT; UINT64 PFS; UINT64 BSP; UINT64 Predicates; UINT64 LoopCount; UINT64 FPSR; } BASE_LIBRARY_JUMP_BUFFER; #elif defined (MDE_CPU_X64) // // X64 context buffer used by SetJump() and LongJump() // typedef struct { UINT64 Rbx; UINT64 Rsp; UINT64 Rbp; UINT64 Rdi; UINT64 Rsi; UINT64 R12; UINT64 R13; UINT64 R14; UINT64 R15; UINT64 Rip; } BASE_LIBRARY_JUMP_BUFFER; #elif defined (MDE_CPU_EBC) // // EBC context buffer used by SetJump() and LongJump() // typedef struct { UINT64 R0; UINT64 R1; UINT64 R2; UINT64 R3; UINT64 IP; } BASE_LIBRARY_JUMP_BUFFER; #else #error Unknown Processor Type #endif // // String Services // /** Copies one Null-terminated Unicode string to another Null-terminated Unicode string and returns the new Unicode string. This function copies the contents of the Unicode string Source to the Unicode string Destination, and returns Destination. If Source and Destination overlap, then the results are undefined. If Destination is NULL, then ASSERT(). If Source is NULL, then ASSERT(). If Source and Destination overlap, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and Source contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). @param Destination Pointer to a Null-terminated Unicode string. @param Source Pointer to a Null-terminated Unicode string. @return Destiantion **/ CHAR16 * EFIAPI StrCpy ( OUT CHAR16 *Destination, IN CONST CHAR16 *Source ); /** Copies one Null-terminated Unicode string with a maximum length to another Null-terminated Unicode string with a maximum length and returns the new Unicode string. This function copies the contents of the Unicode string Source to the Unicode string Destination, and returns Destination. At most, Length Unicode characters are copied from Source to Destination. If Length is 0, then Destination is returned unmodified. If Length is greater that the number of Unicode characters in Source, then Destination is padded with Null Unicode characters. If Source and Destination overlap, then the results are undefined. If Destination is NULL, then ASSERT(). If Source is NULL, then ASSERT(). If Source and Destination overlap, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and Source contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). @param Destination Pointer to a Null-terminated Unicode string. @param Source Pointer to a Null-terminated Unicode string. @param Length Maximum number of Unicode characters to copy. @return Destination **/ CHAR16 * EFIAPI StrnCpy ( OUT CHAR16 *Destination, IN CONST CHAR16 *Source, IN UINTN Length ); /** Returns the length of a Null-terminated Unicode string. This function returns the number of Unicode characters in the Null-terminated Unicode string specified by String. If String is NULL, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and String contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). @param String Pointer to a Null-terminated Unicode string. @return The length of String. **/ UINTN EFIAPI StrLen ( IN CONST CHAR16 *String ); /** Returns the size of a Null-terminated Unicode string in bytes, including the Null terminator. This function returns the size, in bytes, of the Null-terminated Unicode string specified by String. If String is NULL, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and String contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). @param String Pointer to a Null-terminated Unicode string. @return The size of String. **/ UINTN EFIAPI StrSize ( IN CONST CHAR16 *String ); /** Compares two Null-terminated Unicode strings, and returns the difference between the first mismatched Unicode characters. This function compares the Null-terminated Unicode string FirstString to the Null-terminated Unicode string SecondString. If FirstString is identical to SecondString, then 0 is returned. Otherwise, the value returned is the first mismatched Unicode character in SecondString subtracted from the first mismatched Unicode character in FirstString. If FirstString is NULL, then ASSERT(). If SecondString is NULL, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). @param FirstString Pointer to a Null-terminated Unicode string. @param SecondString Pointer to a Null-terminated Unicode string. @retval 0 FirstString is identical to SecondString. @retval !=0 FirstString is not identical to SecondString. **/ INTN EFIAPI StrCmp ( IN CONST CHAR16 *FirstString, IN CONST CHAR16 *SecondString ); /** Compares two Null-terminated Unicode strings with maximum lengths, and returns the difference between the first mismatched Unicode characters. This function compares the Null-terminated Unicode string FirstString to the Null-terminated Unicode string SecondString. At most, Length Unicode characters will be compared. If Length is 0, then 0 is returned. If FirstString is identical to SecondString, then 0 is returned. Otherwise, the value returned is the first mismatched Unicode character in SecondString subtracted from the first mismatched Unicode character in FirstString. If FirstString is NULL, then ASSERT(). If SecondString is NULL, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). @param FirstString Pointer to a Null-terminated Unicode string. @param SecondString Pointer to a Null-terminated Unicode string. @param Length Maximum number of Unicode characters to compare. @retval 0 FirstString is identical to SecondString. @retval !=0 FirstString is not identical to SecondString. **/ INTN EFIAPI StrnCmp ( IN CONST CHAR16 *FirstString, IN CONST CHAR16 *SecondString, IN UINTN Length ); /** Concatenates one Null-terminated Unicode string to another Null-terminated Unicode string, and returns the concatenated Unicode string. This function concatenates two Null-terminated Unicode strings. The contents of Null-terminated Unicode string Source are concatenated to the end of Null-terminated Unicode string Destination. The Null-terminated concatenated Unicode String is returned. If Source and Destination overlap, then the results are undefined. If Destination is NULL, then ASSERT(). If Source is NULL, then ASSERT(). If Source and Destination overlap, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and Destination contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and Source contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and concatenating Destination and Source results in a Unicode string with more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). @param Destination Pointer to a Null-terminated Unicode string. @param Source Pointer to a Null-terminated Unicode string. @return Destination **/ CHAR16 * EFIAPI StrCat ( IN OUT CHAR16 *Destination, IN CONST CHAR16 *Source ); /** Concatenates one Null-terminated Unicode string with a maximum length to the end of another Null-terminated Unicode string, and returns the concatenated Unicode string. This function concatenates two Null-terminated Unicode strings. The contents of Null-terminated Unicode string Source are concatenated to the end of Null-terminated Unicode string Destination, and Destination is returned. At most, Length Unicode characters are concatenated from Source to the end of Destination, and Destination is always Null-terminated. If Length is 0, then Destination is returned unmodified. If Source and Destination overlap, then the results are undefined. If Destination is NULL, then ASSERT(). If Source is NULL, then ASSERT(). If Source and Destination overlap, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and Destination contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and Source contains more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and concatenating Destination and Source results in a Unicode string with more than PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, then ASSERT(). @param Destination Pointer to a Null-terminated Unicode string. @param Source Pointer to a Null-terminated Unicode string. @param Length Maximum number of Unicode characters to concatenate from Source. @return Destination **/ CHAR16 * EFIAPI StrnCat ( IN OUT CHAR16 *Destination, IN CONST CHAR16 *Source, IN UINTN Length ); /** Copies one Null-terminated ASCII string to another Null-terminated ASCII string and returns the new ASCII string. This function copies the contents of the ASCII string Source to the ASCII string Destination, and returns Destination. If Source and Destination overlap, then the results are undefined. If Destination is NULL, then ASSERT(). If Source is NULL, then ASSERT(). If Source and Destination overlap, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and Source contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). @param Destination Pointer to a Null-terminated ASCII string. @param Source Pointer to a Null-terminated ASCII string. @return Destination **/ CHAR8 * EFIAPI AsciiStrCpy ( OUT CHAR8 *Destination, IN CONST CHAR8 *Source ); /** Copies one Null-terminated ASCII string with a maximum length to another Null-terminated ASCII string with a maximum length and returns the new ASCII string. This function copies the contents of the ASCII string Source to the ASCII string Destination, and returns Destination. At most, Length ASCII characters are copied from Source to Destination. If Length is 0, then Destination is returned unmodified. If Length is greater that the number of ASCII characters in Source, then Destination is padded with Null ASCII characters. If Source and Destination overlap, then the results are undefined. If Destination is NULL, then ASSERT(). If Source is NULL, then ASSERT(). If Source and Destination overlap, then ASSERT(). If PcdMaximumAsciiStringLength is not zero, and Source contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). @param Destination Pointer to a Null-terminated ASCII string. @param Source Pointer to a Null-terminated ASCII string. @param Length Maximum number of ASCII characters to copy. @return Destination **/ CHAR8 * EFIAPI AsciiStrnCpy ( OUT CHAR8 *Destination, IN CONST CHAR8 *Source, IN UINTN Length ); /** Returns the length of a Null-terminated ASCII string. This function returns the number of ASCII characters in the Null-terminated ASCII string specified by String. If String is NULL, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and String contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). @param String Pointer to a Null-terminated ASCII string. @return The length of String. **/ UINTN EFIAPI AsciiStrLen ( IN CONST CHAR8 *String ); /** Returns the size of a Null-terminated ASCII string in bytes, including the Null terminator. This function returns the size, in bytes, of the Null-terminated ASCII string specified by String. If String is NULL, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and String contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). @param String Pointer to a Null-terminated ASCII string. @return The size of String. **/ UINTN EFIAPI AsciiStrSize ( IN CONST CHAR8 *String ); /** Compares two Null-terminated ASCII strings, and returns the difference between the first mismatched ASCII characters. This function compares the Null-terminated ASCII string FirstString to the Null-terminated ASCII string SecondString. If FirstString is identical to SecondString, then 0 is returned. Otherwise, the value returned is the first mismatched ASCII character in SecondString subtracted from the first mismatched ASCII character in FirstString. If FirstString is NULL, then ASSERT(). If SecondString is NULL, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and FirstString contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and SecondString contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). @param FirstString Pointer to a Null-terminated ASCII string. @param SecondString Pointer to a Null-terminated ASCII string. @retval 0 FirstString is identical to SecondString. @retval !=0 FirstString is not identical to SecondString. **/ INTN EFIAPI AsciiStrCmp ( IN CONST CHAR8 *FirstString, IN CONST CHAR8 *SecondString ); /** Performs a case insensitive comparison of two Null-terminated ASCII strings, and returns the difference between the first mismatched ASCII characters. This function performs a case insensitive comparison of the Null-terminated ASCII string FirstString to the Null-terminated ASCII string SecondString. If FirstString is identical to SecondString, then 0 is returned. Otherwise, the value returned is the first mismatched lower case ASCII character in SecondString subtracted from the first mismatched lower case ASCII character in FirstString. If FirstString is NULL, then ASSERT(). If SecondString is NULL, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and FirstString contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and SecondString contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). @param FirstString Pointer to a Null-terminated ASCII string. @param SecondString Pointer to a Null-terminated ASCII string. @retval 0 FirstString is identical to SecondString using case insensitive comparisons. @retval !=0 FirstString is not identical to SecondString using case insensitive comparisons. **/ INTN EFIAPI AsciiStriCmp ( IN CONST CHAR8 *FirstString, IN CONST CHAR8 *SecondString ); /** Compares two Null-terminated ASCII strings with maximum lengths, and returns the difference between the first mismatched ASCII characters. This function compares the Null-terminated ASCII string FirstString to the Null-terminated ASCII string SecondString. At most, Length ASCII characters will be compared. If Length is 0, then 0 is returned. If FirstString is identical to SecondString, then 0 is returned. Otherwise, the value returned is the first mismatched ASCII character in SecondString subtracted from the first mismatched ASCII character in FirstString. If FirstString is NULL, then ASSERT(). If SecondString is NULL, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and FirstString contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and SecondString contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). @param FirstString Pointer to a Null-terminated ASCII string. @param SecondString Pointer to a Null-terminated ASCII string. @retval 0 FirstString is identical to SecondString. @retval !=0 FirstString is not identical to SecondString. **/ INTN EFIAPI AsciiStrnCmp ( IN CONST CHAR8 *FirstString, IN CONST CHAR8 *SecondString, IN UINTN Length ); /** Concatenates one Null-terminated ASCII string to another Null-terminated ASCII string, and returns the concatenated ASCII string. This function concatenates two Null-terminated ASCII strings. The contents of Null-terminated ASCII string Source are concatenated to the end of Null- terminated ASCII string Destination. The Null-terminated concatenated ASCII String is returned. If Destination is NULL, then ASSERT(). If Source is NULL, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and Destination contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and Source contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and concatenating Destination and Source results in a ASCII string with more than PcdMaximumAsciiStringLength ASCII characters, then ASSERT(). @param Destination Pointer to a Null-terminated ASCII string. @param Source Pointer to a Null-terminated ASCII string. @return Destination **/ CHAR8 * EFIAPI AsciiStrCat ( IN OUT CHAR8 *Destination, IN CONST CHAR8 *Source ); /** Concatenates one Null-terminated ASCII string with a maximum length to the end of another Null-terminated ASCII string, and returns the concatenated ASCII string. This function concatenates two Null-terminated ASCII strings. The contents of Null-terminated ASCII string Source are concatenated to the end of Null- terminated ASCII string Destination, and Destination is returned. At most, Length ASCII characters are concatenated from Source to the end of Destination, and Destination is always Null-terminated. If Length is 0, then Destination is returned unmodified. If Source and Destination overlap, then the results are undefined. If Destination is NULL, then ASSERT(). If Source is NULL, then ASSERT(). If Source and Destination overlap, then ASSERT(). If PcdMaximumAsciiStringLength is not zero, and Destination contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). If PcdMaximumAsciiStringLength is not zero, and Source contains more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). If PcdMaximumAsciiStringLength is not zero, and concatenating Destination and Source results in a ASCII string with more than PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, then ASSERT(). @param Destination Pointer to a Null-terminated ASCII string. @param Source Pointer to a Null-terminated ASCII string. @param Length Maximum number of ASCII characters to concatenate from Source. @return Destination **/ CHAR8 * EFIAPI AsciiStrnCat ( IN OUT CHAR8 *Destination, IN CONST CHAR8 *Source, IN UINTN Length ); /** Converts an 8-bit value to an 8-bit BCD value. Converts the 8-bit value specified by Value to BCD. The BCD value is returned. If Value >= 100, then ASSERT(). @param Value The 8-bit value to convert to BCD. Range 0..99. @return The BCD value **/ UINT8 EFIAPI DecimalToBcd8 ( IN UINT8 Value ); /** Converts an 8-bit BCD value to an 8-bit value. Converts the 8-bit BCD value specified by Value to an 8-bit value. The 8-bit value is returned. If Value >= 0xA0, then ASSERT(). If (Value & 0x0F) >= 0x0A, then ASSERT(). @param Value The 8-bit BCD value to convert to an 8-bit value. @return The 8-bit value is returned. **/ UINT8 EFIAPI BcdToDecimal8 ( IN UINT8 Value ); // // LIST_ENTRY definition // typedef struct _LIST_ENTRY LIST_ENTRY; struct _LIST_ENTRY { LIST_ENTRY *ForwardLink; LIST_ENTRY *BackLink; }; // // Linked List Functions and Macros // /** Initializes the head node of a doubly linked list that is declared as a global variable in a module. Initializes the forward and backward links of a new linked list. After initializing a linked list with this macro, the other linked list functions may be used to add and remove nodes from the linked list. This macro results in smaller executables by initializing the linked list in the data section, instead if calling the InitializeListHead() function to perform the equivalent operation. @param ListHead The head note of a list to initiailize. **/ #define INITIALIZE_LIST_HEAD_VARIABLE(ListHead) {&ListHead, &ListHead} /** Initializes the head node of a doubly linked list, and returns the pointer to the head node of the doubly linked list. Initializes the forward and backward links of a new linked list. After initializing a linked list with this function, the other linked list functions may be used to add and remove nodes from the linked list. It is up to the caller of this function to allocate the memory for ListHead. If ListHead is NULL, then ASSERT(). @param ListHead A pointer to the head node of a new doubly linked list. @return ListHead **/ LIST_ENTRY * EFIAPI InitializeListHead ( IN LIST_ENTRY *ListHead ); /** Adds a node to the beginning of a doubly linked list, and returns the pointer to the head node of the doubly linked list. Adds the node Entry at the beginning of the doubly linked list denoted by ListHead, and returns ListHead. If ListHead is NULL, then ASSERT(). If Entry is NULL, then ASSERT(). If ListHead was not initialized with InitializeListHead(), then ASSERT(). If PcdMaximumLinkedListLenth is not zero, and prior to insertion the number of nodes in ListHead, including the ListHead node, is greater than or equal to PcdMaximumLinkedListLength, then ASSERT(). @param ListHead A pointer to the head node of a doubly linked list. @param Entry A pointer to a node that is to be inserted at the beginning of a doubly linked list. @return ListHead **/ LIST_ENTRY * EFIAPI InsertHeadList ( IN LIST_ENTRY *ListHead, IN LIST_ENTRY *Entry ); /** Adds a node to the end of a doubly linked list, and returns the pointer to the head node of the doubly linked list. Adds the node Entry to the end of the doubly linked list denoted by ListHead, and returns ListHead. If ListHead is NULL, then ASSERT(). If Entry is NULL, then ASSERT(). If ListHead was not initialized with InitializeListHead(), then ASSERT(). If PcdMaximumLinkedListLenth is not zero, and prior to insertion the number of nodes in ListHead, including the ListHead node, is greater than or equal to PcdMaximumLinkedListLength, then ASSERT(). @param ListHead A pointer to the head node of a doubly linked list. @param Entry A pointer to a node that is to be added at the end of the doubly linked list. @return ListHead **/ LIST_ENTRY * EFIAPI InsertTailList ( IN LIST_ENTRY *ListHead, IN LIST_ENTRY *Entry ); /** Retrieves the first node of a doubly linked list. Returns the first node of a doubly linked list. List must have been initialized with InitializeListHead(). If List is empty, then NULL is returned. If List is NULL, then ASSERT(). If List was not initialized with InitializeListHead(), then ASSERT(). If PcdMaximumLinkedListLenth is not zero, and the number of nodes in List, including the List node, is greater than or equal to PcdMaximumLinkedListLength, then ASSERT(). @param List A pointer to the head node of a doubly linked list. @return The first node of a doubly linked list. @retval NULL The list is empty. **/ LIST_ENTRY * EFIAPI GetFirstNode ( IN CONST LIST_ENTRY *List ); /** Retrieves the next node of a doubly linked list. Returns the node of a doubly linked list that follows Node. List must have been initialized with InitializeListHead(). If List is empty, then List is returned. If List is NULL, then ASSERT(). If Node is NULL, then ASSERT(). If List was not initialized with InitializeListHead(), then ASSERT(). If PcdMaximumLinkedListLenth is not zero, and List contains more than PcdMaximumLinkedListLenth nodes, then ASSERT(). If Node is not a node in List, then ASSERT(). @param List A pointer to the head node of a doubly linked list. @param Node A pointer to a node in the doubly linked list. @return Pointer to the next node if one exists. Otherwise a null value which is actually List is returned. **/ LIST_ENTRY * EFIAPI GetNextNode ( IN CONST LIST_ENTRY *List, IN CONST LIST_ENTRY *Node ); /** Checks to see if a doubly linked list is empty or not. Checks to see if the doubly linked list is empty. If the linked list contains zero nodes, this function returns TRUE. Otherwise, it returns FALSE. If ListHead is NULL, then ASSERT(). If ListHead was not initialized with InitializeListHead(), then ASSERT(). If PcdMaximumLinkedListLenth is not zero, and the number of nodes in List, including the List node, is greater than or equal to PcdMaximumLinkedListLength, then ASSERT(). @param ListHead A pointer to the head node of a doubly linked list. @retval TRUE The linked list is empty. @retval FALSE The linked list is not empty. **/ BOOLEAN EFIAPI IsListEmpty ( IN CONST LIST_ENTRY *ListHead ); /** Determines if a node in a doubly linked list is null. Returns FALSE if Node is one of the nodes in the doubly linked list specified by List. Otherwise, TRUE is returned. List must have been initialized with InitializeListHead(). If List is NULL, then ASSERT(). If Node is NULL, then ASSERT(). If List was not initialized with InitializeListHead(), then ASSERT(). If PcdMaximumLinkedListLenth is not zero, and the number of nodes in List, including the List node, is greater than or equal to PcdMaximumLinkedListLength, then ASSERT(). If Node is not a node in List and Node is not equal to List, then ASSERT(). @param List A pointer to the head node of a doubly linked list. @param Node A pointer to a node in the doubly linked list. @retval TRUE Node is one of the nodes in the doubly linked list. @retval FALSE Node is not one of the nodes in the doubly linked list. **/ BOOLEAN EFIAPI IsNull ( IN CONST LIST_ENTRY *List, IN CONST LIST_ENTRY *Node ); /** Determines if a node the last node in a doubly linked list. Returns TRUE if Node is the last node in the doubly linked list specified by List. Otherwise, FALSE is returned. List must have been initialized with InitializeListHead(). If List is NULL, then ASSERT(). If Node is NULL, then ASSERT(). If List was not initialized with InitializeListHead(), then ASSERT(). If PcdMaximumLinkedListLenth is not zero, and the number of nodes in List, including the List node, is greater than or equal to PcdMaximumLinkedListLength, then ASSERT(). If Node is not a node in List, then ASSERT(). @param List A pointer to the head node of a doubly linked list. @param Node A pointer to a node in the doubly linked list. @retval TRUE Node is the last node in the linked list. @retval FALSE Node is not the last node in the linked list. **/ BOOLEAN EFIAPI IsNodeAtEnd ( IN CONST LIST_ENTRY *List, IN CONST LIST_ENTRY *Node ); /** Swaps the location of two nodes in a doubly linked list, and returns the first node after the swap. If FirstEntry is identical to SecondEntry, then SecondEntry is returned. Otherwise, the location of the FirstEntry node is swapped with the location of the SecondEntry node in a doubly linked list. SecondEntry must be in the same double linked list as FirstEntry and that double linked list must have been initialized with InitializeListHead(). SecondEntry is returned after the nodes are swapped. If FirstEntry is NULL, then ASSERT(). If SecondEntry is NULL, then ASSERT(). If SecondEntry and FirstEntry are not in the same linked list, then ASSERT(). If PcdMaximumLinkedListLength is not zero, and the number of nodes in the linked list containing the FirstEntry and SecondEntry nodes, including the FirstEntry and SecondEntry nodes, is greater than or equal to PcdMaximumLinkedListLength, then ASSERT(). @param FirstEntry A pointer to a node in a linked list. @param SecondEntry A pointer to another node in the same linked list. **/ LIST_ENTRY * EFIAPI SwapListEntries ( IN LIST_ENTRY *FirstEntry, IN LIST_ENTRY *SecondEntry ); /** Removes a node from a doubly linked list, and returns the node that follows the removed node. Removes the node Entry from a doubly linked list. It is up to the caller of this function to release the memory used by this node if that is required. On exit, the node following Entry in the doubly linked list is returned. If Entry is the only node in the linked list, then the head node of the linked list is returned. If Entry is NULL, then ASSERT(). If Entry is the head node of an empty list, then ASSERT(). If PcdMaximumLinkedListLength is not zero, and the number of nodes in the linked list containing Entry, including the Entry node, is greater than or equal to PcdMaximumLinkedListLength, then ASSERT(). @param Entry A pointer to a node in a linked list @return Entry **/ LIST_ENTRY * EFIAPI RemoveEntryList ( IN CONST LIST_ENTRY *Entry ); // // Math Services // /** Shifts a 64-bit integer left between 0 and 63 bits. The low bits are filled with zeros. The shifted value is returned. This function shifts the 64-bit value Operand to the left by Count bits. The low Count bits are set to zero. The shifted value is returned. If Count is greater than 63, then ASSERT(). @param Operand The 64-bit operand to shift left. @param Count The number of bits to shift left. @return Operand << Count **/ UINT64 EFIAPI LShiftU64 ( IN UINT64 Operand, IN UINTN Count ); /** Shifts a 64-bit integer right between 0 and 63 bits. This high bits are filled with zeros. The shifted value is returned. This function shifts the 64-bit value Operand to the right by Count bits. The high Count bits are set to zero. The shifted value is returned. If Count is greater than 63, then ASSERT(). @param Operand The 64-bit operand to shift right. @param Count The number of bits to shift right. @return Operand >> Count **/ UINT64 EFIAPI RShiftU64 ( IN UINT64 Operand, IN UINTN Count ); /** Shifts a 64-bit integer right between 0 and 63 bits. The high bits are filled with original integer's bit 63. The shifted value is returned. This function shifts the 64-bit value Operand to the right by Count bits. The high Count bits are set to bit 63 of Operand. The shifted value is returned. If Count is greater than 63, then ASSERT(). @param Operand The 64-bit operand to shift right. @param Count The number of bits to shift right. @return Operand >> Count **/ UINT64 EFIAPI ARShiftU64 ( IN UINT64 Operand, IN UINTN Count ); /** Rotates a 32-bit integer left between 0 and 31 bits, filling the low bits with the high bits that were rotated. This function rotates the 32-bit value Operand to the left by Count bits. The low Count bits are fill with the high Count bits of Operand. The rotated value is returned. If Count is greater than 31, then ASSERT(). @param Operand The 32-bit operand to rotate left. @param Count The number of bits to rotate left. @return Operand <<< Count **/ UINT32 EFIAPI LRotU32 ( IN UINT32 Operand, IN UINTN Count ); /** Rotates a 32-bit integer right between 0 and 31 bits, filling the high bits with the low bits that were rotated. This function rotates the 32-bit value Operand to the right by Count bits. The high Count bits are fill with the low Count bits of Operand. The rotated value is returned. If Count is greater than 31, then ASSERT(). @param Operand The 32-bit operand to rotate right. @param Count The number of bits to rotate right. @return Operand >>> Count **/ UINT32 EFIAPI RRotU32 ( IN UINT32 Operand, IN UINTN Count ); /** Rotates a 64-bit integer left between 0 and 63 bits, filling the low bits with the high bits that were rotated. This function rotates the 64-bit value Operand to the left by Count bits. The low Count bits are fill with the high Count bits of Operand. The rotated value is returned. If Count is greater than 63, then ASSERT(). @param Operand The 64-bit operand to rotate left. @param Count The number of bits to rotate left. @return Operand <<< Count **/ UINT64 EFIAPI LRotU64 ( IN UINT64 Operand, IN UINTN Count ); /** Rotates a 64-bit integer right between 0 and 63 bits, filling the high bits with the high low bits that were rotated. This function rotates the 64-bit value Operand to the right by Count bits. The high Count bits are fill with the low Count bits of Operand. The rotated value is returned. If Count is greater than 63, then ASSERT(). @param Operand The 64-bit operand to rotate right. @param Count The number of bits to rotate right. @return Operand >>> Count **/ UINT64 EFIAPI RRotU64 ( IN UINT64 Operand, IN UINTN Count ); /** Returns the bit position of the lowest bit set in a 32-bit value. This function computes the bit position of the lowest bit set in the 32-bit value specified by Operand. If Operand is zero, then -1 is returned. Otherwise, a value between 0 and 31 is returned. @param Operand The 32-bit operand to evaluate. @return Position of the lowest bit set in Operand if found. @retval -1 Operand is zero. **/ INTN EFIAPI LowBitSet32 ( IN UINT32 Operand ); /** Returns the bit position of the lowest bit set in a 64-bit value. This function computes the bit position of the lowest bit set in the 64-bit value specified by Operand. If Operand is zero, then -1 is returned. Otherwise, a value between 0 and 63 is returned. @param Operand The 64-bit operand to evaluate. @return Position of the lowest bit set in Operand if found. @retval -1 Operand is zero. **/ INTN EFIAPI LowBitSet64 ( IN UINT64 Operand ); /** Returns the bit position of the highest bit set in a 32-bit value. Equivalent to log2(x). This function computes the bit position of the highest bit set in the 32-bit value specified by Operand. If Operand is zero, then -1 is returned. Otherwise, a value between 0 and 31 is returned. @param Operand The 32-bit operand to evaluate. @return Position of the highest bit set in Operand if found. @retval -1 Operand is zero. **/ INTN EFIAPI HighBitSet32 ( IN UINT32 Operand ); /** Returns the bit position of the highest bit set in a 64-bit value. Equivalent to log2(x). This function computes the bit position of the highest bit set in the 64-bit value specified by Operand. If Operand is zero, then -1 is returned. Otherwise, a value between 0 and 63 is returned. @param Operand The 64-bit operand to evaluate. @return Position of the highest bit set in Operand if found. @retval -1 Operand is zero. **/ INTN EFIAPI HighBitSet64 ( IN UINT64 Operand ); /** Returns the value of the highest bit set in a 32-bit value. Equivalent to 1 << HighBitSet32(x). This function computes the value of the highest bit set in the 32-bit value specified by Operand. If Operand is zero, then zero is returned. @param Operand The 32-bit operand to evaluate. @return 1 << HighBitSet32(Operand) @retval 0 Operand is zero. **/ UINT32 EFIAPI GetPowerOfTwo32 ( IN UINT32 Operand ); /** Returns the value of the highest bit set in a 64-bit value. Equivalent to 1 << HighBitSet64(x). This function computes the value of the highest bit set in the 64-bit value specified by Operand. If Operand is zero, then zero is returned. @param Operand The 64-bit operand to evaluate. @return 1 << HighBitSet64(Operand) @retval 0 Operand is zero. **/ UINT64 EFIAPI GetPowerOfTwo64 ( IN UINT64 Operand ); /** Switches the endianess of a 16-bit integer. This function swaps the bytes in a 16-bit unsigned value to switch the value from little endian to big endian or vice versa. The byte swapped value is returned. @param Operand A 16-bit unsigned value. @return The byte swaped Operand. **/ UINT16 EFIAPI SwapBytes16 ( IN UINT16 Value ); /** Switches the endianess of a 32-bit integer. This function swaps the bytes in a 32-bit unsigned value to switch the value from little endian to big endian or vice versa. The byte swapped value is returned. @param Operand A 32-bit unsigned value. @return The byte swaped Operand. **/ UINT32 EFIAPI SwapBytes32 ( IN UINT32 Value ); /** Switches the endianess of a 64-bit integer. This function swaps the bytes in a 64-bit unsigned value to switch the value from little endian to big endian or vice versa. The byte swapped value is returned. @param Operand A 64-bit unsigned value. @return The byte swaped Operand. **/ UINT64 EFIAPI SwapBytes64 ( IN UINT64 Value ); /** Multiples a 64-bit unsigned integer by a 32-bit unsigned integer and generates a 64-bit unsigned result. This function multiples the 64-bit unsigned value Multiplicand by the 32-bit unsigned value Multiplier and generates a 64-bit unsigned result. This 64- bit unsigned result is returned. If the result overflows, then ASSERT(). @param Multiplicand A 64-bit unsigned value. @param Multiplier A 32-bit unsigned value. @return Multiplicand * Multiplier **/ UINT64 EFIAPI MultU64x32 ( IN UINT64 Multiplicand, IN UINT32 Multiplier ); /** Multiples a 64-bit unsigned integer by a 64-bit unsigned integer and generates a 64-bit unsigned result. This function multiples the 64-bit unsigned value Multiplicand by the 64-bit unsigned value Multiplier and generates a 64-bit unsigned result. This 64- bit unsigned result is returned. If the result overflows, then ASSERT(). @param Multiplicand A 64-bit unsigned value. @param Multiplier A 64-bit unsigned value. @return Multiplicand * Multiplier **/ UINT64 EFIAPI MultU64x64 ( IN UINT64 Multiplicand, IN UINT64 Multiplier ); /** Multiples a 64-bit signed integer by a 64-bit signed integer and generates a 64-bit signed result. This function multiples the 64-bit signed value Multiplicand by the 64-bit signed value Multiplier and generates a 64-bit signed result. This 64-bit signed result is returned. If the result overflows, then ASSERT(). @param Multiplicand A 64-bit signed value. @param Multiplier A 64-bit signed value. @return Multiplicand * Multiplier **/ INT64 EFIAPI MultS64x64 ( IN INT64 Multiplicand, IN INT64 Multiplier ); /** Divides a 64-bit unsigned integer by a 32-bit unsigned integer and generates a 64-bit unsigned result. This function divides the 64-bit unsigned value Dividend by the 32-bit unsigned value Divisor and generates a 64-bit unsigned quotient. This function returns the 64-bit unsigned quotient. If Divisor is 0, then ASSERT(). @param Dividend A 64-bit unsigned value. @param Divisor A 32-bit unsigned value. @return Dividend / Divisor **/ UINT64 EFIAPI DivU64x32 ( IN UINT64 Dividend, IN UINT32 Divisor ); /** Divides a 64-bit unsigned integer by a 32-bit unsigned integer and generates a 32-bit unsigned remainder. This function divides the 64-bit unsigned value Dividend by the 32-bit unsigned value Divisor and generates a 32-bit remainder. This function returns the 32-bit unsigned remainder. If Divisor is 0, then ASSERT(). @param Dividend A 64-bit unsigned value. @param Divisor A 32-bit unsigned value. @return Dividend % Divisor **/ UINT32 EFIAPI ModU64x32 ( IN UINT64 Dividend, IN UINT32 Divisor ); /** Divides a 64-bit unsigned integer by a 32-bit unsigned integer and generates a 64-bit unsigned result and an optional 32-bit unsigned remainder. This function divides the 64-bit unsigned value Dividend by the 32-bit unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder is not NULL, then the 32-bit unsigned remainder is returned in Remainder. This function returns the 64-bit unsigned quotient. If Divisor is 0, then ASSERT(). @param Dividend A 64-bit unsigned value. @param Divisor A 32-bit unsigned value. @param Remainder A pointer to a 32-bit unsigned value. This parameter is optional and may be NULL. @return Dividend / Divisor **/ UINT64 EFIAPI DivU64x32Remainder ( IN UINT64 Dividend, IN UINT32 Divisor, OUT UINT32 *Remainder OPTIONAL ); /** Divides a 64-bit unsigned integer by a 64-bit unsigned integer and generates a 64-bit unsigned result and an optional 64-bit unsigned remainder. This function divides the 64-bit unsigned value Dividend by the 64-bit unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder is not NULL, then the 64-bit unsigned remainder is returned in Remainder. This function returns the 64-bit unsigned quotient. If Divisor is 0, then ASSERT(). @param Dividend A 64-bit unsigned value. @param Divisor A 64-bit unsigned value. @param Remainder A pointer to a 64-bit unsigned value. This parameter is optional and may be NULL. @return Dividend / Divisor **/ UINT64 EFIAPI DivU64x64Remainder ( IN UINT64 Dividend, IN UINT64 Divisor, OUT UINT64 *Remainder OPTIONAL ); /** Divides a 64-bit signed integer by a 64-bit signed integer and generates a 64-bit signed result and a optional 64-bit signed remainder. This function divides the 64-bit signed value Dividend by the 64-bit signed value Divisor and generates a 64-bit signed quotient. If Remainder is not NULL, then the 64-bit signed remainder is returned in Remainder. This function returns the 64-bit signed quotient. If Divisor is 0, then ASSERT(). @param Dividend A 64-bit signed value. @param Divisor A 64-bit signed value. @param Remainder A pointer to a 64-bit signed value. This parameter is optional and may be NULL. @return Dividend / Divisor **/ INT64 EFIAPI DivS64x64Remainder ( IN INT64 Dividend, IN INT64 Divisor, OUT INT64 *Remainder OPTIONAL ); /** Reads a 16-bit value from memory that may be unaligned. This function returns the 16-bit value pointed to by Buffer. The function guarantees that the read operation does not produce an alignment fault. If the Buffer is NULL, then ASSERT(). @param Buffer Pointer to a 16-bit value that may be unaligned. @return *Uint16 **/ UINT16 EFIAPI ReadUnaligned16 ( IN CONST UINT16 *Uint16 ); /** Writes a 16-bit value to memory that may be unaligned. This function writes the 16-bit value specified by Value to Buffer. Value is returned. The function guarantees that the write operation does not produce an alignment fault. If the Buffer is NULL, then ASSERT(). @param Buffer Pointer to a 16-bit value that may be unaligned. @param Value 16-bit value to write to Buffer. @return Value **/ UINT16 EFIAPI WriteUnaligned16 ( OUT UINT16 *Uint16, IN UINT16 Value ); /** Reads a 24-bit value from memory that may be unaligned. This function returns the 24-bit value pointed to by Buffer. The function guarantees that the read operation does not produce an alignment fault. If the Buffer is NULL, then ASSERT(). @param Buffer Pointer to a 24-bit value that may be unaligned. @return The value read. **/ UINT32 EFIAPI ReadUnaligned24 ( IN CONST UINT32 *Buffer ); /** Writes a 24-bit value to memory that may be unaligned. This function writes the 24-bit value specified by Value to Buffer. Value is returned. The function guarantees that the write operation does not produce an alignment fault. If the Buffer is NULL, then ASSERT(). @param Buffer Pointer to a 24-bit value that may be unaligned. @param Value 24-bit value to write to Buffer. @return The value written. **/ UINT32 EFIAPI WriteUnaligned24 ( OUT UINT32 *Buffer, IN UINT32 Value ); /** Reads a 32-bit value from memory that may be unaligned. This function returns the 32-bit value pointed to by Buffer. The function guarantees that the read operation does not produce an alignment fault. If the Buffer is NULL, then ASSERT(). @param Buffer Pointer to a 32-bit value that may be unaligned. @return *Uint32 **/ UINT32 EFIAPI ReadUnaligned32 ( IN CONST UINT32 *Uint32 ); /** Writes a 32-bit value to memory that may be unaligned. This function writes the 32-bit value specified by Value to Buffer. Value is returned. The function guarantees that the write operation does not produce an alignment fault. If the Buffer is NULL, then ASSERT(). @param Buffer Pointer to a 32-bit value that may be unaligned. @param Value 32-bit value to write to Buffer. @return Value **/ UINT32 EFIAPI WriteUnaligned32 ( OUT UINT32 *Uint32, IN UINT32 Value ); /** Reads a 64-bit value from memory that may be unaligned. This function returns the 64-bit value pointed to by Buffer. The function guarantees that the read operation does not produce an alignment fault. If the Buffer is NULL, then ASSERT(). @param Buffer Pointer to a 64-bit value that may be unaligned. @return *Uint64 **/ UINT64 EFIAPI ReadUnaligned64 ( IN CONST UINT64 *Uint64 ); /** Writes a 64-bit value to memory that may be unaligned. This function writes the 64-bit value specified by Value to Buffer. Value is returned. The function guarantees that the write operation does not produce an alignment fault. If the Buffer is NULL, then ASSERT(). @param Buffer Pointer to a 64-bit value that may be unaligned. @param Value 64-bit value to write to Buffer. @return Value **/ UINT64 EFIAPI WriteUnaligned64 ( OUT UINT64 *Uint64, IN UINT64 Value ); // // Bit Field Functions // /** Returns a bit field from an 8-bit value. Returns the bitfield specified by the StartBit and the EndBit from Operand. If 8-bit operations are not supported, then ASSERT(). If StartBit is greater than 7, then ASSERT(). If EndBit is greater than 7, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..7. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..7. @return The bit field read. **/ UINT8 EFIAPI BitFieldRead8 ( IN UINT8 Operand, IN UINTN StartBit, IN UINTN EndBit ); /** Writes a bit field to an 8-bit value, and returns the result. Writes Value to the bit field specified by the StartBit and the EndBit in Operand. All other bits in Operand are preserved. The new 8-bit value is returned. If 8-bit operations are not supported, then ASSERT(). If StartBit is greater than 7, then ASSERT(). If EndBit is greater than 7, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..7. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..7. @param Value New value of the bit field. @return The new 8-bit value. **/ UINT8 EFIAPI BitFieldWrite8 ( IN UINT8 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT8 Value ); /** Reads a bit field from an 8-bit value, performs a bitwise OR, and returns the result. Performs a bitwise inclusive OR between the bit field specified by StartBit and EndBit in Operand and the value specified by OrData. All other bits in Operand are preserved. The new 8-bit value is returned. If 8-bit operations are not supported, then ASSERT(). If StartBit is greater than 7, then ASSERT(). If EndBit is greater than 7, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..7. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..7. @param OrData The value to OR with the read value from the value @return The new 8-bit value. **/ UINT8 EFIAPI BitFieldOr8 ( IN UINT8 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT8 OrData ); /** Reads a bit field from an 8-bit value, performs a bitwise AND, and returns the result. Performs a bitwise AND between the bit field specified by StartBit and EndBit in Operand and the value specified by AndData. All other bits in Operand are preserved. The new 8-bit value is returned. If 8-bit operations are not supported, then ASSERT(). If StartBit is greater than 7, then ASSERT(). If EndBit is greater than 7, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..7. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..7. @param AndData The value to AND with the read value from the value. @return The new 8-bit value. **/ UINT8 EFIAPI BitFieldAnd8 ( IN UINT8 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT8 AndData ); /** Reads a bit field from an 8-bit value, performs a bitwise AND followed by a bitwise OR, and returns the result. Performs a bitwise AND between the bit field specified by StartBit and EndBit in Operand and the value specified by AndData, followed by a bitwise inclusive OR with value specified by OrData. All other bits in Operand are preserved. The new 8-bit value is returned. If 8-bit operations are not supported, then ASSERT(). If StartBit is greater than 7, then ASSERT(). If EndBit is greater than 7, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..7. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..7. @param AndData The value to AND with the read value from the value. @param OrData The value to OR with the result of the AND operation. @return The new 8-bit value. **/ UINT8 EFIAPI BitFieldAndThenOr8 ( IN UINT8 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT8 AndData, IN UINT8 OrData ); /** Returns a bit field from a 16-bit value. Returns the bitfield specified by the StartBit and the EndBit from Operand. If 16-bit operations are not supported, then ASSERT(). If StartBit is greater than 15, then ASSERT(). If EndBit is greater than 15, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..15. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..15. @return The bit field read. **/ UINT16 EFIAPI BitFieldRead16 ( IN UINT16 Operand, IN UINTN StartBit, IN UINTN EndBit ); /** Writes a bit field to a 16-bit value, and returns the result. Writes Value to the bit field specified by the StartBit and the EndBit in Operand. All other bits in Operand are preserved. The new 16-bit value is returned. If 16-bit operations are not supported, then ASSERT(). If StartBit is greater than 15, then ASSERT(). If EndBit is greater than 15, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..15. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..15. @param Value New value of the bit field. @return The new 16-bit value. **/ UINT16 EFIAPI BitFieldWrite16 ( IN UINT16 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT16 Value ); /** Reads a bit field from a 16-bit value, performs a bitwise OR, and returns the result. Performs a bitwise inclusive OR between the bit field specified by StartBit and EndBit in Operand and the value specified by OrData. All other bits in Operand are preserved. The new 16-bit value is returned. If 16-bit operations are not supported, then ASSERT(). If StartBit is greater than 15, then ASSERT(). If EndBit is greater than 15, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..15. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..15. @param OrData The value to OR with the read value from the value @return The new 16-bit value. **/ UINT16 EFIAPI BitFieldOr16 ( IN UINT16 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT16 OrData ); /** Reads a bit field from a 16-bit value, performs a bitwise AND, and returns the result. Performs a bitwise AND between the bit field specified by StartBit and EndBit in Operand and the value specified by AndData. All other bits in Operand are preserved. The new 16-bit value is returned. If 16-bit operations are not supported, then ASSERT(). If StartBit is greater than 15, then ASSERT(). If EndBit is greater than 15, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..15. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..15. @param AndData The value to AND with the read value from the value @return The new 16-bit value. **/ UINT16 EFIAPI BitFieldAnd16 ( IN UINT16 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT16 AndData ); /** Reads a bit field from a 16-bit value, performs a bitwise AND followed by a bitwise OR, and returns the result. Performs a bitwise AND between the bit field specified by StartBit and EndBit in Operand and the value specified by AndData, followed by a bitwise inclusive OR with value specified by OrData. All other bits in Operand are preserved. The new 16-bit value is returned. If 16-bit operations are not supported, then ASSERT(). If StartBit is greater than 15, then ASSERT(). If EndBit is greater than 15, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..15. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..15. @param AndData The value to AND with the read value from the value. @param OrData The value to OR with the result of the AND operation. @return The new 16-bit value. **/ UINT16 EFIAPI BitFieldAndThenOr16 ( IN UINT16 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT16 AndData, IN UINT16 OrData ); /** Returns a bit field from a 32-bit value. Returns the bitfield specified by the StartBit and the EndBit from Operand. If 32-bit operations are not supported, then ASSERT(). If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @return The bit field read. **/ UINT32 EFIAPI BitFieldRead32 ( IN UINT32 Operand, IN UINTN StartBit, IN UINTN EndBit ); /** Writes a bit field to a 32-bit value, and returns the result. Writes Value to the bit field specified by the StartBit and the EndBit in Operand. All other bits in Operand are preserved. The new 32-bit value is returned. If 32-bit operations are not supported, then ASSERT(). If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @param Value New value of the bit field. @return The new 32-bit value. **/ UINT32 EFIAPI BitFieldWrite32 ( IN UINT32 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT32 Value ); /** Reads a bit field from a 32-bit value, performs a bitwise OR, and returns the result. Performs a bitwise inclusive OR between the bit field specified by StartBit and EndBit in Operand and the value specified by OrData. All other bits in Operand are preserved. The new 32-bit value is returned. If 32-bit operations are not supported, then ASSERT(). If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @param OrData The value to OR with the read value from the value @return The new 32-bit value. **/ UINT32 EFIAPI BitFieldOr32 ( IN UINT32 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT32 OrData ); /** Reads a bit field from a 32-bit value, performs a bitwise AND, and returns the result. Performs a bitwise AND between the bit field specified by StartBit and EndBit in Operand and the value specified by AndData. All other bits in Operand are preserved. The new 32-bit value is returned. If 32-bit operations are not supported, then ASSERT(). If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @param AndData The value to AND with the read value from the value @return The new 32-bit value. **/ UINT32 EFIAPI BitFieldAnd32 ( IN UINT32 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT32 AndData ); /** Reads a bit field from a 32-bit value, performs a bitwise AND followed by a bitwise OR, and returns the result. Performs a bitwise AND between the bit field specified by StartBit and EndBit in Operand and the value specified by AndData, followed by a bitwise inclusive OR with value specified by OrData. All other bits in Operand are preserved. The new 32-bit value is returned. If 32-bit operations are not supported, then ASSERT(). If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @param AndData The value to AND with the read value from the value. @param OrData The value to OR with the result of the AND operation. @return The new 32-bit value. **/ UINT32 EFIAPI BitFieldAndThenOr32 ( IN UINT32 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT32 AndData, IN UINT32 OrData ); /** Returns a bit field from a 64-bit value. Returns the bitfield specified by the StartBit and the EndBit from Operand. If 64-bit operations are not supported, then ASSERT(). If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @return The bit field read. **/ UINT64 EFIAPI BitFieldRead64 ( IN UINT64 Operand, IN UINTN StartBit, IN UINTN EndBit ); /** Writes a bit field to a 64-bit value, and returns the result. Writes Value to the bit field specified by the StartBit and the EndBit in Operand. All other bits in Operand are preserved. The new 64-bit value is returned. If 64-bit operations are not supported, then ASSERT(). If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @param Value New value of the bit field. @return The new 64-bit value. **/ UINT64 EFIAPI BitFieldWrite64 ( IN UINT64 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT64 Value ); /** Reads a bit field from a 64-bit value, performs a bitwise OR, and returns the result. Performs a bitwise inclusive OR between the bit field specified by StartBit and EndBit in Operand and the value specified by OrData. All other bits in Operand are preserved. The new 64-bit value is returned. If 64-bit operations are not supported, then ASSERT(). If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @param OrData The value to OR with the read value from the value @return The new 64-bit value. **/ UINT64 EFIAPI BitFieldOr64 ( IN UINT64 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT64 OrData ); /** Reads a bit field from a 64-bit value, performs a bitwise AND, and returns the result. Performs a bitwise AND between the bit field specified by StartBit and EndBit in Operand and the value specified by AndData. All other bits in Operand are preserved. The new 64-bit value is returned. If 64-bit operations are not supported, then ASSERT(). If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @param AndData The value to AND with the read value from the value @return The new 64-bit value. **/ UINT64 EFIAPI BitFieldAnd64 ( IN UINT64 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT64 AndData ); /** Reads a bit field from a 64-bit value, performs a bitwise AND followed by a bitwise OR, and returns the result. Performs a bitwise AND between the bit field specified by StartBit and EndBit in Operand and the value specified by AndData, followed by a bitwise inclusive OR with value specified by OrData. All other bits in Operand are preserved. The new 64-bit value is returned. If 64-bit operations are not supported, then ASSERT(). If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Operand Operand on which to perform the bitfield operation. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @param AndData The value to AND with the read value from the value. @param OrData The value to OR with the result of the AND operation. @return The new 64-bit value. **/ UINT64 EFIAPI BitFieldAndThenOr64 ( IN UINT64 Operand, IN UINTN StartBit, IN UINTN EndBit, IN UINT64 AndData, IN UINT64 OrData ); // // Base Library Synchronization Functions // /** Retrieves the architecture specific spin lock alignment requirements for optimal spin lock performance. This function retrieves the spin lock alignment requirements for optimal performance on a given CPU architecture. The spin lock alignment must be a power of two and is returned by this function. If there are no alignment requirements, then 1 must be returned. The spin lock synchronization functions must function correctly if the spin lock size and alignment values returned by this function are not used at all. These values are hints to the consumers of the spin lock synchronization functions to obtain optimal spin lock performance. @return The architecture specific spin lock alignment. **/ UINTN EFIAPI GetSpinLockProperties ( VOID ); /** Initializes a spin lock to the released state and returns the spin lock. This function initializes the spin lock specified by SpinLock to the released state, and returns SpinLock. Optimal performance can be achieved by calling GetSpinLockProperties() to determine the size and alignment requirements for SpinLock. If SpinLock is NULL, then ASSERT(). @param SpinLock A pointer to the spin lock to initialize to the released state. @return SpinLock **/ SPIN_LOCK * EFIAPI InitializeSpinLock ( IN SPIN_LOCK *SpinLock ); /** Waits until a spin lock can be placed in the acquired state. This function checks the state of the spin lock specified by SpinLock. If SpinLock is in the released state, then this function places SpinLock in the acquired state and returns SpinLock. Otherwise, this function waits indefinitely for the spin lock to be released, and then places it in the acquired state and returns SpinLock. All state transitions of SpinLock must be performed using MP safe mechanisms. If SpinLock is NULL, then ASSERT(). If SpinLock was not initialized with InitializeSpinLock(), then ASSERT(). If PcdSpinLockTimeout is not zero, and SpinLock is can not be acquired in PcdSpinLockTimeout microseconds, then ASSERT(). @param SpinLock A pointer to the spin lock to place in the acquired state. @return SpinLock **/ SPIN_LOCK * EFIAPI AcquireSpinLock ( IN SPIN_LOCK *SpinLock ); /** Attempts to place a spin lock in the acquired state. This function checks the state of the spin lock specified by SpinLock. If SpinLock is in the released state, then this function places SpinLock in the acquired state and returns TRUE. Otherwise, FALSE is returned. All state transitions of SpinLock must be performed using MP safe mechanisms. If SpinLock is NULL, then ASSERT(). If SpinLock was not initialized with InitializeSpinLock(), then ASSERT(). @param SpinLock A pointer to the spin lock to place in the acquired state. @retval TRUE SpinLock was placed in the acquired state. @retval FALSE SpinLock could not be acquired. **/ BOOLEAN EFIAPI AcquireSpinLockOrFail ( IN SPIN_LOCK *SpinLock ); /** Releases a spin lock. This function places the spin lock specified by SpinLock in the release state and returns SpinLock. If SpinLock is NULL, then ASSERT(). If SpinLock was not initialized with InitializeSpinLock(), then ASSERT(). @param SpinLock A pointer to the spin lock to release. @return SpinLock **/ SPIN_LOCK * EFIAPI ReleaseSpinLock ( IN SPIN_LOCK *SpinLock ); /** Performs an atomic increment of an 32-bit unsigned integer. Performs an atomic increment of the 32-bit unsigned integer specified by Value and returns the incremented value. The increment operation must be performed using MP safe mechanisms. The state of the return value is not guaranteed to be MP safe. If Value is NULL, then ASSERT(). @param Value A pointer to the 32-bit value to increment. @return The incremented value. **/ UINT32 EFIAPI InterlockedIncrement ( IN UINT32 *Value ); /** Performs an atomic decrement of an 32-bit unsigned integer. Performs an atomic decrement of the 32-bit unsigned integer specified by Value and returns the decremented value. The decrement operation must be performed using MP safe mechanisms. The state of the return value is not guaranteed to be MP safe. If Value is NULL, then ASSERT(). @param Value A pointer to the 32-bit value to decrement. @return The decremented value. **/ UINT32 EFIAPI InterlockedDecrement ( IN UINT32 *Value ); /** Performs an atomic compare exchange operation on a 32-bit unsigned integer. @param Value A pointer to the 32-bit value for the compare exchange operation. @param CompareValue 32-bit value used in compare operation. @param ExchangeValue 32-bit value used in exchange operation. @return The original *Value before exchange. **/ UINT32 EFIAPI InterlockedCompareExchange32 ( IN OUT UINT32 *Value, IN UINT32 CompareValue, IN UINT32 ExchangeValue ); /** Performs an atomic compare exchange operation on a 64-bit unsigned integer. @param Value A pointer to the 64-bit value for the compare exchange operation. @param CompareValue 64-bit value used in compare operation. @param ExchangeValue 64-bit value used in exchange operation. @return The original *Value before exchange. **/ UINT64 EFIAPI InterlockedCompareExchange64 ( IN OUT UINT64 *Value, IN UINT64 CompareValue, IN UINT64 ExchangeValue ); /** Performs an atomic compare exchange operation on a pointer value. Performs an atomic compare exchange operation on the pointer value specified by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. The compare exchange operation must be performed using MP safe mechanisms. If Value is NULL, then ASSERT(). @param Value A pointer to the pointer value for the compare exchange operation. @param CompareValue Pointer value used in compare operation. @param ExchangeValue Pointer value used in exchange operation. **/ VOID * EFIAPI InterlockedCompareExchangePointer ( IN OUT VOID **Value, IN VOID *CompareValue, IN VOID *ExchangeValue ); // // Base Library CPU Functions // typedef VOID (EFIAPI *SWITCH_STACK_ENTRY_POINT) ( IN VOID *Context1, OPTIONAL IN VOID *Context2 OPTIONAL ); /** Used to serialize load and store operations. All loads and stores that proceed calls to this function are guaranteed to be globally visible when this function returns. **/ VOID EFIAPI MemoryFence ( VOID ); /** Saves the current CPU context that can be restored with a call to LongJump() and returns 0. Saves the current CPU context in the buffer specified by JumpBuffer and returns 0. The initial call to SetJump() must always return 0. Subsequent calls to LongJump() cause a non-zero value to be returned by SetJump(). If JumpBuffer is NULL, then ASSERT(). @param JumpBuffer A pointer to CPU context buffer. @retval 0 Indicates a return from SetJump(). **/ UINTN EFIAPI SetJump ( OUT BASE_LIBRARY_JUMP_BUFFER *JumpBuffer ); /** Restores the CPU context that was saved with SetJump(). Restores the CPU context from the buffer specified by JumpBuffer. This function never returns to the caller. Instead is resumes execution based on the state of JumpBuffer. If JumpBuffer is NULL, then ASSERT(). If Value is 0, then ASSERT(). @param JumpBuffer A pointer to CPU context buffer. @param Value The value to return when the SetJump() context is restored and must be non-zero. **/ VOID EFIAPI LongJump ( IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer, IN UINTN Value ); /** Enables CPU interrupts. Enables CPU interrupts. **/ VOID EFIAPI EnableInterrupts ( VOID ); /** Disables CPU interrupts. Disables CPU interrupts. **/ VOID EFIAPI DisableInterrupts ( VOID ); /** Disables CPU interrupts and returns the interrupt state prior to the disable operation. Disables CPU interrupts and returns the interrupt state prior to the disable operation. @retval TRUE CPU interrupts were enabled on entry to this call. @retval FALSE CPU interrupts were disabled on entry to this call. **/ BOOLEAN EFIAPI SaveAndDisableInterrupts ( VOID ); /** Enables CPU interrupts for the smallest window required to capture any pending interrupts. Enables CPU interrupts for the smallest window required to capture any pending interrupts. **/ VOID EFIAPI EnableDisableInterrupts ( VOID ); /** Retrieves the current CPU interrupt state. Retrieves the current CPU interrupt state. Returns TRUE is interrupts are currently enabled. Otherwise returns FALSE. @retval TRUE CPU interrupts are enabled. @retval FALSE CPU interrupts are disabled. **/ BOOLEAN EFIAPI GetInterruptState ( VOID ); /** Set the current CPU interrupt state. Sets the current CPU interrupt state to the state specified by InterruptState. If InterruptState is TRUE, then interrupts are enabled. If InterruptState is FALSE, then interrupts are disabled. InterruptState is returned. @param InterruptState TRUE if interrupts should enabled. FALSE if interrupts should be disabled. @return InterruptState **/ BOOLEAN EFIAPI SetInterruptState ( IN BOOLEAN InterruptState ); /** Places the CPU in a sleep state until an interrupt is received. Places the CPU in a sleep state until an interrupt is received. If interrupts are disabled prior to calling this function, then the CPU will be placed in a sleep state indefinitely. **/ VOID EFIAPI CpuSleep ( VOID ); /** Requests CPU to pause for a short period of time. Requests CPU to pause for a short period of time. Typically used in MP systems to prevent memory starvation while waiting for a spin lock. **/ VOID EFIAPI CpuPause ( VOID ); /** Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU. Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU. **/ VOID EFIAPI CpuFlushTlb ( VOID ); /** Transfers control to a function starting with a new stack. Transfers control to the function specified by EntryPoint using the new stack specified by NewStack and passing in the parameters specified by Context1 and Context2. Context1 and Context2 are optional and may be NULL. The function EntryPoint must never return. If EntryPoint is NULL, then ASSERT(). If NewStack is NULL, then ASSERT(). @param EntryPoint A pointer to function to call with the new stack. @param Context1 A pointer to the context to pass into the EntryPoint function. @param Context2 A pointer to the context to pass into the EntryPoint function. @param NewStack A pointer to the new stack to use for the EntryPoint function. **/ VOID EFIAPI SwitchStack ( IN SWITCH_STACK_ENTRY_POINT EntryPoint, IN VOID *Context1, OPTIONAL IN VOID *Context2, OPTIONAL IN VOID *NewStack ); /** Generates a breakpoint on the CPU. Generates a breakpoint on the CPU. The breakpoint must be implemented such that code can resume normal execution after the breakpoint. **/ VOID EFIAPI CpuBreakpoint ( VOID ); /** Executes an infinite loop. Forces the CPU to execute an infinite loop. A debugger may be used to skip past the loop and the code that follows the loop must execute properly. This implies that the infinite loop must not cause the code that follow it to be optimized away. **/ VOID EFIAPI CpuDeadLoop ( VOID ); // // IA32 and X64 Specific Functions // // // Byte packed structure for 16-bit Real Mode EFLAGS // typedef union { struct { UINT32 CF:1; // Carry Flag UINT32 Reserved_0:1; // Reserved UINT32 PF:1; // Parity Flag UINT32 Reserved_1:1; // Reserved UINT32 AF:1; // Auxiliary Carry Flag UINT32 Reserved_2:1; // Reserved UINT32 ZF:1; // Zero Flag UINT32 SF:1; // Sign Flag UINT32 TF:1; // Trap Flag UINT32 IF:1; // Interrupt Enable Flag UINT32 DF:1; // Direction Flag UINT32 OF:1; // Overflow Flag UINT32 IOPL:2; // I/O Privilege Level UINT32 NT:1; // Nested Task UINT32 Reserved_3:1; // Reserved } Bits; UINT16 Uint16; } IA32_FLAGS16; // // Byte packed structure for EFLAGS/RFLAGS // 32-bits on IA-32 // 64-bits on X64. The upper 32-bits on X64 are reserved // typedef union { struct { UINT32 CF:1; // Carry Flag UINT32 Reserved_0:1; // Reserved UINT32 PF:1; // Parity Flag UINT32 Reserved_1:1; // Reserved UINT32 AF:1; // Auxiliary Carry Flag UINT32 Reserved_2:1; // Reserved UINT32 ZF:1; // Zero Flag UINT32 SF:1; // Sign Flag UINT32 TF:1; // Trap Flag UINT32 IF:1; // Interrupt Enable Flag UINT32 DF:1; // Direction Flag UINT32 OF:1; // Overflow Flag UINT32 IOPL:2; // I/O Privilege Level UINT32 NT:1; // Nested Task UINT32 Reserved_3:1; // Reserved UINT32 RF:1; // Resume Flag UINT32 VM:1; // Virtual 8086 Mode UINT32 AC:1; // Alignment Check UINT32 VIF:1; // Virtual Interrupt Flag UINT32 VIP:1; // Virtual Interrupt Pending UINT32 ID:1; // ID Flag UINT32 Reserved_4:10; // Reserved } Bits; UINTN UintN; } IA32_EFLAGS32; // // Byte packed structure for Control Register 0 (CR0) // 32-bits on IA-32 // 64-bits on X64. The upper 32-bits on X64 are reserved // typedef union { struct { UINT32 PE:1; // Protection Enable UINT32 MP:1; // Monitor Coprocessor UINT32 EM:1; // Emulation UINT32 TS:1; // Task Switched UINT32 ET:1; // Extension Type UINT32 NE:1; // Numeric Error UINT32 Reserved_0:10; // Reserved UINT32 WP:1; // Write Protect UINT32 Reserved_1:1; // Reserved UINT32 AM:1; // Alignment Mask UINT32 Reserved_2:10; // Reserved UINT32 NW:1; // Mot Write-through UINT32 CD:1; // Cache Disable UINT32 PG:1; // Paging } Bits; UINTN UintN; } IA32_CR0; // // Byte packed structure for Control Register 4 (CR4) // 32-bits on IA-32 // 64-bits on X64. The upper 32-bits on X64 are reserved // typedef union { struct { UINT32 VME:1; // Virtual-8086 Mode Extensions UINT32 PVI:1; // Protected-Mode Virtual Interrupts UINT32 TSD:1; // Time Stamp Disable UINT32 DE:1; // Debugging Extensions UINT32 PSE:1; // Page Size Extensions UINT32 PAE:1; // Physical Address Extension UINT32 MCE:1; // Machine Check Enable UINT32 PGE:1; // Page Global Enable UINT32 PCE:1; // Performance Monitoring Counter // Enable UINT32 OSFXSR:1; // Operating System Support for // FXSAVE and FXRSTOR instructions UINT32 OSXMMEXCPT:1; // Operating System Support for // Unmasked SIMD Floating Point // Exceptions UINT32 Reserved_0:2; // Reserved UINT32 VMXE:1; // VMX Enable UINT32 Reserved_1:18; // Reseved } Bits; UINTN UintN; } IA32_CR4; // // Byte packed structure for an IDTR, GDTR, LDTR descriptor /// @bug How to make this structure byte-packed in a compiler independent way? // typedef struct { UINT16 Limit; UINTN Base; } IA32_DESCRIPTOR; #define IA32_IDT_GATE_TYPE_TASK 0x85 #define IA32_IDT_GATE_TYPE_INTERRUPT_16 0x86 #define IA32_IDT_GATE_TYPE_TRAP_16 0x87 #define IA32_IDT_GATE_TYPE_INTERRUPT_32 0x8E #define IA32_IDT_GATE_TYPE_TRAP_32 0x8F // // Byte packed structure for an Interrupt Gate Descriptor // typedef union { struct { UINT32 OffsetLow:16; // Offset bits 15..0 UINT32 Selector:16; // Selector UINT32 Reserved_0:8; // Reserved UINT32 GateType:8; // Gate Type. See #defines above UINT32 OffsetHigh:16; // Offset bits 31..16 } Bits; UINT64 Uint64; } IA32_IDT_GATE_DESCRIPTOR; // // Byte packed structure for an FP/SSE/SSE2 context // typedef struct { UINT8 Buffer[512]; } IA32_FX_BUFFER; // // Structures for the 16-bit real mode thunks // typedef struct { UINT32 Reserved1; UINT32 Reserved2; UINT32 Reserved3; UINT32 Reserved4; UINT8 BL; UINT8 BH; UINT16 Reserved5; UINT8 DL; UINT8 DH; UINT16 Reserved6; UINT8 CL; UINT8 CH; UINT16 Reserved7; UINT8 AL; UINT8 AH; UINT16 Reserved8; } IA32_BYTE_REGS; typedef struct { UINT16 DI; UINT16 Reserved1; UINT16 SI; UINT16 Reserved2; UINT16 BP; UINT16 Reserved3; UINT16 SP; UINT16 Reserved4; UINT16 BX; UINT16 Reserved5; UINT16 DX; UINT16 Reserved6; UINT16 CX; UINT16 Reserved7; UINT16 AX; UINT16 Reserved8; } IA32_WORD_REGS; typedef struct { UINT32 EDI; UINT32 ESI; UINT32 EBP; UINT32 ESP; UINT32 EBX; UINT32 EDX; UINT32 ECX; UINT32 EAX; UINT16 DS; UINT16 ES; UINT16 FS; UINT16 GS; IA32_EFLAGS32 EFLAGS; UINT32 Eip; UINT16 CS; UINT16 SS; } IA32_DWORD_REGS; typedef union { IA32_DWORD_REGS E; IA32_WORD_REGS X; IA32_BYTE_REGS H; } IA32_REGISTER_SET; // // Byte packed structure for an 16-bit real mode thunks // typedef struct { IA32_REGISTER_SET *RealModeState; VOID *RealModeBuffer; UINT32 RealModeBufferSize; UINT32 ThunkAttributes; } THUNK_CONTEXT; #define THUNK_ATTRIBUTE_BIG_REAL_MODE 0x00000001 #define THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 0x00000002 #define THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL 0x00000004 /** Retrieves CPUID information. Executes the CPUID instruction with EAX set to the value specified by Index. This function always returns Index. If Eax is not NULL, then the value of EAX after CPUID is returned in Eax. If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx. If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx. If Edx is not NULL, then the value of EDX after CPUID is returned in Edx. This function is only available on IA-32 and X64. @param Index The 32-bit value to load into EAX prior to invoking the CPUID instruction. @param Eax Pointer to the 32-bit EAX value returned by the CPUID instruction. This is an optional parameter that may be NULL. @param Ebx Pointer to the 32-bit EBX value returned by the CPUID instruction. This is an optional parameter that may be NULL. @param Ecx Pointer to the 32-bit ECX value returned by the CPUID instruction. This is an optional parameter that may be NULL. @param Edx Pointer to the 32-bit EDX value returned by the CPUID instruction. This is an optional parameter that may be NULL. @return Index **/ UINT32 EFIAPI AsmCpuid ( IN UINT32 Index, OUT UINT32 *Eax, OPTIONAL OUT UINT32 *Ebx, OPTIONAL OUT UINT32 *Ecx, OPTIONAL OUT UINT32 *Edx OPTIONAL ); /** Retrieves CPUID information using an extended leaf identifier. Executes the CPUID instruction with EAX set to the value specified by Index and ECX set to the value specified by SubIndex. This function always returns Index. This function is only available on IA-32 and x64. If Eax is not NULL, then the value of EAX after CPUID is returned in Eax. If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx. If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx. If Edx is not NULL, then the value of EDX after CPUID is returned in Edx. @param Index The 32-bit value to load into EAX prior to invoking the CPUID instruction. @param SubIndex The 32-bit value to load into ECX prior to invoking the CPUID instruction. @param Eax Pointer to the 32-bit EAX value returned by the CPUID instruction. This is an optional parameter that may be NULL. @param Ebx Pointer to the 32-bit EBX value returned by the CPUID instruction. This is an optional parameter that may be NULL. @param Ecx Pointer to the 32-bit ECX value returned by the CPUID instruction. This is an optional parameter that may be NULL. @param Edx Pointer to the 32-bit EDX value returned by the CPUID instruction. This is an optional parameter that may be NULL. @return Index **/ UINT32 EFIAPI AsmCpuidEx ( IN UINT32 Index, IN UINT32 SubIndex, OUT UINT32 *Eax, OPTIONAL OUT UINT32 *Ebx, OPTIONAL OUT UINT32 *Ecx, OPTIONAL OUT UINT32 *Edx OPTIONAL ); /** Returns the lower 32-bits of a Machine Specific Register(MSR). Reads and returns the lower 32-bits of the MSR specified by Index. No parameter checking is performed on Index, and some Index values may cause CPU exceptions. The caller must either guarantee that Index is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to read. @return The lower 32 bits of the MSR identified by Index. **/ UINT32 EFIAPI AsmReadMsr32 ( IN UINT32 Index ); /** Zero-extend a 32-bit value and writes it to a Machine Specific Register(MSR). Writes the 32-bit value specified by Value to the MSR specified by Index. The upper 32-bits of the MSR write are set to zero. The 32-bit value written to the MSR is returned. No parameter checking is performed on Index or Value, and some of these may cause CPU exceptions. The caller must either guarantee that Index and Value are valid, or the caller must establish proper exception handlers. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to write. @param Value The 32-bit value to write to the MSR. @return Value **/ UINT32 EFIAPI AsmWriteMsr32 ( IN UINT32 Index, IN UINT32 Value ); /** Reads a 64-bit MSR, performs a bitwise inclusive OR on the lower 32-bits, and writes the result back to the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise inclusive OR between the lower 32-bits of the read result and the value specified by OrData, and writes the result to the 64-bit MSR specified by Index. The lower 32-bits of the value written to the MSR is returned. No parameter checking is performed on Index or OrData, and some of these may cause CPU exceptions. The caller must either guarantee that Index and OrData are valid, or the caller must establish proper exception handlers. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to write. @param OrData The value to OR with the read value from the MSR. @return The lower 32-bit value written to the MSR. **/ UINT32 EFIAPI AsmMsrOr32 ( IN UINT32 Index, IN UINT32 OrData ); /** Reads a 64-bit MSR, performs a bitwise AND on the lower 32-bits, and writes the result back to the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise AND between the lower 32-bits of the read result and the value specified by AndData, and writes the result to the 64-bit MSR specified by Index. The lower 32-bits of the value written to the MSR is returned. No parameter checking is performed on Index or AndData, and some of these may cause CPU exceptions. The caller must either guarantee that Index and AndData are valid, or the caller must establish proper exception handlers. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to write. @param AndData The value to AND with the read value from the MSR. @return The lower 32-bit value written to the MSR. **/ UINT32 EFIAPI AsmMsrAnd32 ( IN UINT32 Index, IN UINT32 AndData ); /** Reads a 64-bit MSR, performs a bitwise AND followed by a bitwise inclusive OR on the lower 32-bits, and writes the result back to the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise AND between the lower 32-bits of the read result and the value specified by AndData preserving the upper 32-bits, performs a bitwise inclusive OR between the result of the AND operation and the value specified by OrData, and writes the result to the 64-bit MSR specified by Address. The lower 32-bits of the value written to the MSR is returned. No parameter checking is performed on Index, AndData, or OrData, and some of these may cause CPU exceptions. The caller must either guarantee that Index, AndData, and OrData are valid, or the caller must establish proper exception handlers. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to write. @param AndData The value to AND with the read value from the MSR. @param OrData The value to OR with the result of the AND operation. @return The lower 32-bit value written to the MSR. **/ UINT32 EFIAPI AsmMsrAndThenOr32 ( IN UINT32 Index, IN UINT32 AndData, IN UINT32 OrData ); /** Reads a bit field of an MSR. Reads the bit field in the lower 32-bits of a 64-bit MSR. The bit field is specified by the StartBit and the EndBit. The value of the bit field is returned. The caller must either guarantee that Index is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to read. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @return The bit field read from the MSR. **/ UINT32 EFIAPI AsmMsrBitFieldRead32 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit ); /** Writes a bit field to an MSR. Writes Value to a bit field in the lower 32-bits of a 64-bit MSR. The bit field is specified by the StartBit and the EndBit. All other bits in the destination MSR are preserved. The lower 32-bits of the MSR written is returned. Extra left bits in Value are stripped. The caller must either guarantee that Index and the data written is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to write. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @param Value New value of the bit field. @return The lower 32-bit of the value written to the MSR. **/ UINT32 EFIAPI AsmMsrBitFieldWrite32 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit, IN UINT32 Value ); /** Reads a bit field in a 64-bit MSR, performs a bitwise OR, and writes the result back to the bit field in the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise inclusive OR between the read result and the value specified by OrData, and writes the result to the 64-bit MSR specified by Index. The lower 32-bits of the value written to the MSR are returned. Extra left bits in OrData are stripped. The caller must either guarantee that Index and the data written is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to write. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @param OrData The value to OR with the read value from the MSR. @return The lower 32-bit of the value written to the MSR. **/ UINT32 EFIAPI AsmMsrBitFieldOr32 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit, IN UINT32 OrData ); /** Reads a bit field in a 64-bit MSR, performs a bitwise AND, and writes the result back to the bit field in the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise AND between the read result and the value specified by AndData, and writes the result to the 64-bit MSR specified by Index. The lower 32-bits of the value written to the MSR are returned. Extra left bits in AndData are stripped. The caller must either guarantee that Index and the data written is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to write. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @param AndData The value to AND with the read value from the MSR. @return The lower 32-bit of the value written to the MSR. **/ UINT32 EFIAPI AsmMsrBitFieldAnd32 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit, IN UINT32 AndData ); /** Reads a bit field in a 64-bit MSR, performs a bitwise AND followed by a bitwise inclusive OR, and writes the result back to the bit field in the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise AND followed by a bitwise inclusive OR between the read result and the value specified by AndData, and writes the result to the 64-bit MSR specified by Index. The lower 32-bits of the value written to the MSR are returned. Extra left bits in both AndData and OrData are stripped. The caller must either guarantee that Index and the data written is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 31, then ASSERT(). If EndBit is greater than 31, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to write. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..31. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..31. @param AndData The value to AND with the read value from the MSR. @param OrData The value to OR with the result of the AND operation. @return The lower 32-bit of the value written to the MSR. **/ UINT32 EFIAPI AsmMsrBitFieldAndThenOr32 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit, IN UINT32 AndData, IN UINT32 OrData ); /** Returns a 64-bit Machine Specific Register(MSR). Reads and returns the 64-bit MSR specified by Index. No parameter checking is performed on Index, and some Index values may cause CPU exceptions. The caller must either guarantee that Index is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to read. @return The value of the MSR identified by Index. **/ UINT64 EFIAPI AsmReadMsr64 ( IN UINT32 Index ); /** Writes a 64-bit value to a Machine Specific Register(MSR), and returns the value. Writes the 64-bit value specified by Value to the MSR specified by Index. The 64-bit value written to the MSR is returned. No parameter checking is performed on Index or Value, and some of these may cause CPU exceptions. The caller must either guarantee that Index and Value are valid, or the caller must establish proper exception handlers. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to write. @param Value The 64-bit value to write to the MSR. @return Value **/ UINT64 EFIAPI AsmWriteMsr64 ( IN UINT32 Index, IN UINT64 Value ); /** Reads a 64-bit MSR, performs a bitwise inclusive OR, and writes the result back to the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise inclusive OR between the read result and the value specified by OrData, and writes the result to the 64-bit MSR specified by Index. The value written to the MSR is returned. No parameter checking is performed on Index or OrData, and some of these may cause CPU exceptions. The caller must either guarantee that Index and OrData are valid, or the caller must establish proper exception handlers. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to write. @param OrData The value to OR with the read value from the MSR. @return The value written back to the MSR. **/ UINT64 EFIAPI AsmMsrOr64 ( IN UINT32 Index, IN UINT64 OrData ); /** Reads a 64-bit MSR, performs a bitwise AND, and writes the result back to the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise AND between the read result and the value specified by OrData, and writes the result to the 64-bit MSR specified by Index. The value written to the MSR is returned. No parameter checking is performed on Index or OrData, and some of these may cause CPU exceptions. The caller must either guarantee that Index and OrData are valid, or the caller must establish proper exception handlers. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to write. @param AndData The value to AND with the read value from the MSR. @return The value written back to the MSR. **/ UINT64 EFIAPI AsmMsrAnd64 ( IN UINT32 Index, IN UINT64 AndData ); /** Reads a 64-bit MSR, performs a bitwise AND followed by a bitwise inclusive OR, and writes the result back to the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise AND between read result and the value specified by AndData, performs a bitwise inclusive OR between the result of the AND operation and the value specified by OrData, and writes the result to the 64-bit MSR specified by Index. The value written to the MSR is returned. No parameter checking is performed on Index, AndData, or OrData, and some of these may cause CPU exceptions. The caller must either guarantee that Index, AndData, and OrData are valid, or the caller must establish proper exception handlers. This function is only available on IA-32 and X64. @param Index The 32-bit MSR index to write. @param AndData The value to AND with the read value from the MSR. @param OrData The value to OR with the result of the AND operation. @return The value written back to the MSR. **/ UINT64 EFIAPI AsmMsrAndThenOr64 ( IN UINT32 Index, IN UINT64 AndData, IN UINT64 OrData ); /** Reads a bit field of an MSR. Reads the bit field in the 64-bit MSR. The bit field is specified by the StartBit and the EndBit. The value of the bit field is returned. The caller must either guarantee that Index is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to read. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @return The value read from the MSR. **/ UINT64 EFIAPI AsmMsrBitFieldRead64 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit ); /** Writes a bit field to an MSR. Writes Value to a bit field in a 64-bit MSR. The bit field is specified by the StartBit and the EndBit. All other bits in the destination MSR are preserved. The MSR written is returned. Extra left bits in Value are stripped. The caller must either guarantee that Index and the data written is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to write. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @param Value New value of the bit field. @return The value written back to the MSR. **/ UINT64 EFIAPI AsmMsrBitFieldWrite64 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit, IN UINT64 Value ); /** Reads a bit field in a 64-bit MSR, performs a bitwise inclusive OR, and writes the result back to the bit field in the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise inclusive OR between the read result and the value specified by OrData, and writes the result to the 64-bit MSR specified by Index. The value written to the MSR is returned. Extra left bits in OrData are stripped. The caller must either guarantee that Index and the data written is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to write. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @param OrData The value to OR with the read value from the bit field. @return The value written back to the MSR. **/ UINT64 EFIAPI AsmMsrBitFieldOr64 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit, IN UINT64 OrData ); /** Reads a bit field in a 64-bit MSR, performs a bitwise AND, and writes the result back to the bit field in the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise AND between the read result and the value specified by AndData, and writes the result to the 64-bit MSR specified by Index. The value written to the MSR is returned. Extra left bits in AndData are stripped. The caller must either guarantee that Index and the data written is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to write. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @param AndData The value to AND with the read value from the bit field. @return The value written back to the MSR. **/ UINT64 EFIAPI AsmMsrBitFieldAnd64 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit, IN UINT64 AndData ); /** Reads a bit field in a 64-bit MSR, performs a bitwise AND followed by a bitwise inclusive OR, and writes the result back to the bit field in the 64-bit MSR. Reads the 64-bit MSR specified by Index, performs a bitwise AND followed by a bitwise inclusive OR between the read result and the value specified by AndData, and writes the result to the 64-bit MSR specified by Index. The value written to the MSR is returned. Extra left bits in both AndData and OrData are stripped. The caller must either guarantee that Index and the data written is valid, or the caller must set up exception handlers to catch the exceptions. This function is only available on IA-32 and X64. If StartBit is greater than 63, then ASSERT(). If EndBit is greater than 63, then ASSERT(). If EndBit is less than StartBit, then ASSERT(). @param Index The 32-bit MSR index to write. @param StartBit The ordinal of the least significant bit in the bit field. Range 0..63. @param EndBit The ordinal of the most significant bit in the bit field. Range 0..63. @param AndData The value to AND with the read value from the bit field. @param OrData The value to OR with the result of the AND operation. @return The value written back to the MSR. **/ UINT64 EFIAPI AsmMsrBitFieldAndThenOr64 ( IN UINT32 Index, IN UINTN StartBit, IN UINTN EndBit, IN UINT64 AndData, IN UINT64 OrData ); /** Reads the current value of the EFLAGS register. Reads and returns the current value of the EFLAGS register. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return EFLAGS on IA-32 or RFLAGS on X64. **/ UINTN EFIAPI AsmReadEflags ( VOID ); /** Reads the current value of the Control Register 0 (CR0). Reads and returns the current value of CR0. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of the Control Register 0 (CR0). **/ UINTN EFIAPI AsmReadCr0 ( VOID ); /** Reads the current value of the Control Register 2 (CR2). Reads and returns the current value of CR2. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of the Control Register 2 (CR2). **/ UINTN EFIAPI AsmReadCr2 ( VOID ); /** Reads the current value of the Control Register 3 (CR3). Reads and returns the current value of CR3. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of the Control Register 3 (CR3). **/ UINTN EFIAPI AsmReadCr3 ( VOID ); /** Reads the current value of the Control Register 4 (CR4). Reads and returns the current value of CR4. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of the Control Register 4 (CR4). **/ UINTN EFIAPI AsmReadCr4 ( VOID ); /** Writes a value to Control Register 0 (CR0). Writes and returns a new value to CR0. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Cr0 The value to write to CR0. @return The value written to CR0. **/ UINTN EFIAPI AsmWriteCr0 ( UINTN Cr0 ); /** Writes a value to Control Register 2 (CR2). Writes and returns a new value to CR2. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Cr2 The value to write to CR2. @return The value written to CR2. **/ UINTN EFIAPI AsmWriteCr2 ( UINTN Cr2 ); /** Writes a value to Control Register 3 (CR3). Writes and returns a new value to CR3. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Cr3 The value to write to CR3. @return The value written to CR3. **/ UINTN EFIAPI AsmWriteCr3 ( UINTN Cr3 ); /** Writes a value to Control Register 4 (CR4). Writes and returns a new value to CR4. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Cr4 The value to write to CR4. @return The value written to CR4. **/ UINTN EFIAPI AsmWriteCr4 ( UINTN Cr4 ); /** Reads the current value of Debug Register 0 (DR0). Reads and returns the current value of DR0. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of Debug Register 0 (DR0). **/ UINTN EFIAPI AsmReadDr0 ( VOID ); /** Reads the current value of Debug Register 1 (DR1). Reads and returns the current value of DR1. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of Debug Register 1 (DR1). **/ UINTN EFIAPI AsmReadDr1 ( VOID ); /** Reads the current value of Debug Register 2 (DR2). Reads and returns the current value of DR2. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of Debug Register 2 (DR2). **/ UINTN EFIAPI AsmReadDr2 ( VOID ); /** Reads the current value of Debug Register 3 (DR3). Reads and returns the current value of DR3. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of Debug Register 3 (DR3). **/ UINTN EFIAPI AsmReadDr3 ( VOID ); /** Reads the current value of Debug Register 4 (DR4). Reads and returns the current value of DR4. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of Debug Register 4 (DR4). **/ UINTN EFIAPI AsmReadDr4 ( VOID ); /** Reads the current value of Debug Register 5 (DR5). Reads and returns the current value of DR5. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of Debug Register 5 (DR5). **/ UINTN EFIAPI AsmReadDr5 ( VOID ); /** Reads the current value of Debug Register 6 (DR6). Reads and returns the current value of DR6. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of Debug Register 6 (DR6). **/ UINTN EFIAPI AsmReadDr6 ( VOID ); /** Reads the current value of Debug Register 7 (DR7). Reads and returns the current value of DR7. This function is only available on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on X64. @return The value of Debug Register 7 (DR7). **/ UINTN EFIAPI AsmReadDr7 ( VOID ); /** Writes a value to Debug Register 0 (DR0). Writes and returns a new value to DR0. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Dr0 The value to write to Dr0. @return The value written to Debug Register 0 (DR0). **/ UINTN EFIAPI AsmWriteDr0 ( UINTN Dr0 ); /** Writes a value to Debug Register 1 (DR1). Writes and returns a new value to DR1. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Dr1 The value to write to Dr1. @return The value written to Debug Register 1 (DR1). **/ UINTN EFIAPI AsmWriteDr1 ( UINTN Dr1 ); /** Writes a value to Debug Register 2 (DR2). Writes and returns a new value to DR2. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Dr2 The value to write to Dr2. @return The value written to Debug Register 2 (DR2). **/ UINTN EFIAPI AsmWriteDr2 ( UINTN Dr2 ); /** Writes a value to Debug Register 3 (DR3). Writes and returns a new value to DR3. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Dr3 The value to write to Dr3. @return The value written to Debug Register 3 (DR3). **/ UINTN EFIAPI AsmWriteDr3 ( UINTN Dr3 ); /** Writes a value to Debug Register 4 (DR4). Writes and returns a new value to DR4. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Dr4 The value to write to Dr4. @return The value written to Debug Register 4 (DR4). **/ UINTN EFIAPI AsmWriteDr4 ( UINTN Dr4 ); /** Writes a value to Debug Register 5 (DR5). Writes and returns a new value to DR5. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Dr5 The value to write to Dr5. @return The value written to Debug Register 5 (DR5). **/ UINTN EFIAPI AsmWriteDr5 ( UINTN Dr5 ); /** Writes a value to Debug Register 6 (DR6). Writes and returns a new value to DR6. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Dr6 The value to write to Dr6. @return The value written to Debug Register 6 (DR6). **/ UINTN EFIAPI AsmWriteDr6 ( UINTN Dr6 ); /** Writes a value to Debug Register 7 (DR7). Writes and returns a new value to DR7. This function is only available on IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64. @param Dr7 The value to write to Dr7. @return The value written to Debug Register 7 (DR7). **/ UINTN EFIAPI AsmWriteDr7 ( UINTN Dr7 ); /** Reads the current value of Code Segment Register (CS). Reads and returns the current value of CS. This function is only available on IA-32 and X64. @return The current value of CS. **/ UINT16 EFIAPI AsmReadCs ( VOID ); /** Reads the current value of Data Segment Register (DS). Reads and returns the current value of DS. This function is only available on IA-32 and X64. @return The current value of DS. **/ UINT16 EFIAPI AsmReadDs ( VOID ); /** Reads the current value of Extra Segment Register (ES). Reads and returns the current value of ES. This function is only available on IA-32 and X64. @return The current value of ES. **/ UINT16 EFIAPI AsmReadEs ( VOID ); /** Reads the current value of FS Data Segment Register (FS). Reads and returns the current value of FS. This function is only available on IA-32 and X64. @return The current value of FS. **/ UINT16 EFIAPI AsmReadFs ( VOID ); /** Reads the current value of GS Data Segment Register (GS). Reads and returns the current value of GS. This function is only available on IA-32 and X64. @return The current value of GS. **/ UINT16 EFIAPI AsmReadGs ( VOID ); /** Reads the current value of Stack Segment Register (SS). Reads and returns the current value of SS. This function is only available on IA-32 and X64. @return The current value of SS. **/ UINT16 EFIAPI AsmReadSs ( VOID ); /** Reads the current value of Task Register (TR). Reads and returns the current value of TR. This function is only available on IA-32 and X64. @return The current value of TR. **/ UINT16 EFIAPI AsmReadTr ( VOID ); /** Reads the current Global Descriptor Table Register(GDTR) descriptor. Reads and returns the current GDTR descriptor and returns it in Gdtr. This function is only available on IA-32 and X64. If Gdtr is NULL, then ASSERT(). @param Gdtr Pointer to a GDTR descriptor. **/ VOID EFIAPI AsmReadGdtr ( OUT IA32_DESCRIPTOR *Gdtr ); /** Writes the current Global Descriptor Table Register (GDTR) descriptor. Writes and the current GDTR descriptor specified by Gdtr. This function is only available on IA-32 and X64. If Gdtr is NULL, then ASSERT(). @param Gdtr Pointer to a GDTR descriptor. **/ VOID EFIAPI AsmWriteGdtr ( IN CONST IA32_DESCRIPTOR *Gdtr ); /** Reads the current Interrupt Descriptor Table Register(GDTR) descriptor. Reads and returns the current IDTR descriptor and returns it in Idtr. This function is only available on IA-32 and X64. If Idtr is NULL, then ASSERT(). @param Idtr Pointer to a IDTR descriptor. **/ VOID EFIAPI AsmReadIdtr ( OUT IA32_DESCRIPTOR *Idtr ); /** Writes the current Interrupt Descriptor Table Register(GDTR) descriptor. Writes the current IDTR descriptor and returns it in Idtr. This function is only available on IA-32 and X64. If Idtr is NULL, then ASSERT(). @param Idtr Pointer to a IDTR descriptor. **/ VOID EFIAPI AsmWriteIdtr ( IN CONST IA32_DESCRIPTOR *Idtr ); /** Reads the current Local Descriptor Table Register(LDTR) selector. Reads and returns the current 16-bit LDTR descriptor value. This function is only available on IA-32 and X64. @return The current selector of LDT. **/ UINT16 EFIAPI AsmReadLdtr ( VOID ); /** Writes the current Local Descriptor Table Register (GDTR) selector. Writes and the current LDTR descriptor specified by Ldtr. This function is only available on IA-32 and X64. @param Ldtr 16-bit LDTR selector value. **/ VOID EFIAPI AsmWriteLdtr ( IN UINT16 Ldtr ); /** Save the current floating point/SSE/SSE2 context to a buffer. Saves the current floating point/SSE/SSE2 state to the buffer specified by Buffer. Buffer must be aligned on a 16-byte boundary. This function is only available on IA-32 and X64. If Buffer is NULL, then ASSERT(). If Buffer is not aligned on a 16-byte boundary, then ASSERT(). @param Buffer Pointer to a buffer to save the floating point/SSE/SSE2 context. **/ VOID EFIAPI AsmFxSave ( OUT IA32_FX_BUFFER *Buffer ); /** Restores the current floating point/SSE/SSE2 context from a buffer. Restores the current floating point/SSE/SSE2 state from the buffer specified by Buffer. Buffer must be aligned on a 16-byte boundary. This function is only available on IA-32 and X64. If Buffer is NULL, then ASSERT(). If Buffer is not aligned on a 16-byte boundary, then ASSERT(). If Buffer was not saved with AsmFxSave(), then ASSERT(). @param Buffer Pointer to a buffer to save the floating point/SSE/SSE2 context. **/ VOID EFIAPI AsmFxRestore ( IN CONST IA32_FX_BUFFER *Buffer ); /** Reads the current value of 64-bit MMX Register #0 (MM0). Reads and returns the current value of MM0. This function is only available on IA-32 and X64. @return The current value of MM0. **/ UINT64 EFIAPI AsmReadMm0 ( VOID ); /** Reads the current value of 64-bit MMX Register #1 (MM1). Reads and returns the current value of MM1. This function is only available on IA-32 and X64. @return The current value of MM1. **/ UINT64 EFIAPI AsmReadMm1 ( VOID ); /** Reads the current value of 64-bit MMX Register #2 (MM2). Reads and returns the current value of MM2. This function is only available on IA-32 and X64. @return The current value of MM2. **/ UINT64 EFIAPI AsmReadMm2 ( VOID ); /** Reads the current value of 64-bit MMX Register #3 (MM3). Reads and returns the current value of MM3. This function is only available on IA-32 and X64. @return The current value of MM3. **/ UINT64 EFIAPI AsmReadMm3 ( VOID ); /** Reads the current value of 64-bit MMX Register #4 (MM4). Reads and returns the current value of MM4. This function is only available on IA-32 and X64. @return The current value of MM4. **/ UINT64 EFIAPI AsmReadMm4 ( VOID ); /** Reads the current value of 64-bit MMX Register #5 (MM5). Reads and returns the current value of MM5. This function is only available on IA-32 and X64. @return The current value of MM5. **/ UINT64 EFIAPI AsmReadMm5 ( VOID ); /** Reads the current value of 64-bit MMX Register #6 (MM6). Reads and returns the current value of MM6. This function is only available on IA-32 and X64. @return The current value of MM6. **/ UINT64 EFIAPI AsmReadMm6 ( VOID ); /** Reads the current value of 64-bit MMX Register #7 (MM7). Reads and returns the current value of MM7. This function is only available on IA-32 and X64. @return The current value of MM7. **/ UINT64 EFIAPI AsmReadMm7 ( VOID ); /** Writes the current value of 64-bit MMX Register #0 (MM0). Writes the current value of MM0. This function is only available on IA32 and X64. @param Value The 64-bit value to write to MM0. **/ VOID EFIAPI AsmWriteMm0 ( IN UINT64 Value ); /** Writes the current value of 64-bit MMX Register #1 (MM1). Writes the current value of MM1. This function is only available on IA32 and X64. @param Value The 64-bit value to write to MM1. **/ VOID EFIAPI AsmWriteMm1 ( IN UINT64 Value ); /** Writes the current value of 64-bit MMX Register #2 (MM2). Writes the current value of MM2. This function is only available on IA32 and X64. @param Value The 64-bit value to write to MM2. **/ VOID EFIAPI AsmWriteMm2 ( IN UINT64 Value ); /** Writes the current value of 64-bit MMX Register #3 (MM3). Writes the current value of MM3. This function is only available on IA32 and X64. @param Value The 64-bit value to write to MM3. **/ VOID EFIAPI AsmWriteMm3 ( IN UINT64 Value ); /** Writes the current value of 64-bit MMX Register #4 (MM4). Writes the current value of MM4. This function is only available on IA32 and X64. @param Value The 64-bit value to write to MM4. **/ VOID EFIAPI AsmWriteMm4 ( IN UINT64 Value ); /** Writes the current value of 64-bit MMX Register #5 (MM5). Writes the current value of MM5. This function is only available on IA32 and X64. @param Value The 64-bit value to write to MM5. **/ VOID EFIAPI AsmWriteMm5 ( IN UINT64 Value ); /** Writes the current value of 64-bit MMX Register #6 (MM6). Writes the current value of MM6. This function is only available on IA32 and X64. @param Value The 64-bit value to write to MM6. **/ VOID EFIAPI AsmWriteMm6 ( IN UINT64 Value ); /** Writes the current value of 64-bit MMX Register #7 (MM7). Writes the current value of MM7. This function is only available on IA32 and X64. @param Value The 64-bit value to write to MM7. **/ VOID EFIAPI AsmWriteMm7 ( IN UINT64 Value ); /** Reads the current value of Time Stamp Counter (TSC). Reads and returns the current value of TSC. This function is only available on IA-32 and X64. @return The current value of TSC **/ UINT64 EFIAPI AsmReadTsc ( VOID ); /** Reads the current value of a Performance Counter (PMC). Reads and returns the current value of performance counter specified by Index. This function is only available on IA-32 and X64. @param Index The 32-bit Performance Counter index to read. @return The value of the PMC specified by Index. **/ UINT64 EFIAPI AsmReadPmc ( IN UINT32 Index ); /** Sets up a monitor buffer that is used by AsmMwait(). Executes a MONITOR instruction with the register state specified by Eax, Ecx and Edx. Returns Eax. This function is only available on IA-32 and X64. @param Eax The value to load into EAX or RAX before executing the MONITOR instruction. @param Ecx The value to load into ECX or RCX before executing the MONITOR instruction. @param Edx The value to load into EDX or RDX before executing the MONITOR instruction. @return Eax **/ UINTN EFIAPI AsmMonitor ( IN UINTN Eax, IN UINTN Ecx, IN UINTN Edx ); /** Executes an MWAIT instruction. Executes an MWAIT instruction with the register state specified by Eax and Ecx. Returns Eax. This function is only available on IA-32 and X64. @param Eax The value to load into EAX or RAX before executing the MONITOR instruction. @param Ecx The value to load into ECX or RCX before executing the MONITOR instruction. @return Eax **/ UINTN EFIAPI AsmMwait ( IN UINTN Eax, IN UINTN Ecx ); /** Executes a WBINVD instruction. Executes a WBINVD instruction. This function is only available on IA-32 and X64. **/ VOID EFIAPI AsmWbinvd ( VOID ); /** Executes a INVD instruction. Executes a INVD instruction. This function is only available on IA-32 and X64. **/ VOID EFIAPI AsmInvd ( VOID ); /** Flushes a cache line from all the instruction and data caches within the coherency domain of the CPU. Flushed the cache line specified by LinearAddress, and returns LinearAddress. This function is only available on IA-32 and X64. @param LinearAddress The address of the cache line to flush. If the CPU is in a physical addressing mode, then LinearAddress is a physical address. If the CPU is in a virtual addressing mode, then LinearAddress is a virtual address. @return LinearAddress **/ VOID * EFIAPI AsmFlushCacheLine ( IN VOID *LinearAddress ); /** Enables the 32-bit paging mode on the CPU. Enables the 32-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables must be properly initialized prior to calling this service. This function assumes the current execution mode is 32-bit protected mode. This function is only available on IA-32. After the 32-bit paging mode is enabled, control is transferred to the function specified by EntryPoint using the new stack specified by NewStack and passing in the parameters specified by Context1 and Context2. Context1 and Context2 are optional and may be NULL. The function EntryPoint must never return. If the current execution mode is not 32-bit protected mode, then ASSERT(). If EntryPoint is NULL, then ASSERT(). If NewStack is NULL, then ASSERT(). There are a number of constraints that must be followed before calling this function: 1) Interrupts must be disabled. 2) The caller must be in 32-bit protected mode with flat descriptors. This means all descriptors must have a base of 0 and a limit of 4GB. 3) CR0 and CR4 must be compatible with 32-bit protected mode with flat descriptors. 4) CR3 must point to valid page tables that will be used once the transition is complete, and those page tables must guarantee that the pages for this function and the stack are identity mapped. @param EntryPoint A pointer to function to call with the new stack after paging is enabled. @param Context1 A pointer to the context to pass into the EntryPoint function as the first parameter after paging is enabled. @param Context2 A pointer to the context to pass into the EntryPoint function as the second parameter after paging is enabled. @param NewStack A pointer to the new stack to use for the EntryPoint function after paging is enabled. **/ VOID EFIAPI AsmEnablePaging32 ( IN SWITCH_STACK_ENTRY_POINT EntryPoint, IN VOID *Context1, OPTIONAL IN VOID *Context2, OPTIONAL IN VOID *NewStack ); /** Disables the 32-bit paging mode on the CPU. Disables the 32-bit paging mode on the CPU and returns to 32-bit protected mode. This function assumes the current execution mode is 32-paged protected mode. This function is only available on IA-32. After the 32-bit paging mode is disabled, control is transferred to the function specified by EntryPoint using the new stack specified by NewStack and passing in the parameters specified by Context1 and Context2. Context1 and Context2 are optional and may be NULL. The function EntryPoint must never return. If the current execution mode is not 32-bit paged mode, then ASSERT(). If EntryPoint is NULL, then ASSERT(). If NewStack is NULL, then ASSERT(). There are a number of constraints that must be followed before calling this function: 1) Interrupts must be disabled. 2) The caller must be in 32-bit paged mode. 3) CR0, CR3, and CR4 must be compatible with 32-bit paged mode. 4) CR3 must point to valid page tables that guarantee that the pages for this function and the stack are identity mapped. @param EntryPoint A pointer to function to call with the new stack after paging is disabled. @param Context1 A pointer to the context to pass into the EntryPoint function as the first parameter after paging is disabled. @param Context2 A pointer to the context to pass into the EntryPoint function as the second parameter after paging is disabled. @param NewStack A pointer to the new stack to use for the EntryPoint function after paging is disabled. **/ VOID EFIAPI AsmDisablePaging32 ( IN SWITCH_STACK_ENTRY_POINT EntryPoint, IN VOID *Context1, OPTIONAL IN VOID *Context2, OPTIONAL IN VOID *NewStack ); /** Enables the 64-bit paging mode on the CPU. Enables the 64-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables must be properly initialized prior to calling this service. This function assumes the current execution mode is 32-bit protected mode with flat descriptors. This function is only available on IA-32. After the 64-bit paging mode is enabled, control is transferred to the function specified by EntryPoint using the new stack specified by NewStack and passing in the parameters specified by Context1 and Context2. Context1 and Context2 are optional and may be 0. The function EntryPoint must never return. If the current execution mode is not 32-bit protected mode with flat descriptors, then ASSERT(). If EntryPoint is 0, then ASSERT(). If NewStack is 0, then ASSERT(). @param Cs The 16-bit selector to load in the CS before EntryPoint is called. The descriptor in the GDT that this selector references must be setup for long mode. @param EntryPoint The 64-bit virtual address of the function to call with the new stack after paging is enabled. @param Context1 The 64-bit virtual address of the context to pass into the EntryPoint function as the first parameter after paging is enabled. @param Context2 The 64-bit virtual address of the context to pass into the EntryPoint function as the second parameter after paging is enabled. @param NewStack The 64-bit virtual address of the new stack to use for the EntryPoint function after paging is enabled. **/ VOID EFIAPI AsmEnablePaging64 ( IN UINT16 CodeSelector, IN UINT64 EntryPoint, IN UINT64 Context1, OPTIONAL IN UINT64 Context2, OPTIONAL IN UINT64 NewStack ); /** Disables the 64-bit paging mode on the CPU. Disables the 64-bit paging mode on the CPU and returns to 32-bit protected mode. This function assumes the current execution mode is 64-paging mode. This function is only available on X64. After the 64-bit paging mode is disabled, control is transferred to the function specified by EntryPoint using the new stack specified by NewStack and passing in the parameters specified by Context1 and Context2. Context1 and Context2 are optional and may be 0. The function EntryPoint must never return. If the current execution mode is not 64-bit paged mode, then ASSERT(). If EntryPoint is 0, then ASSERT(). If NewStack is 0, then ASSERT(). @param Cs The 16-bit selector to load in the CS before EntryPoint is called. The descriptor in the GDT that this selector references must be setup for 32-bit protected mode. @param EntryPoint The 64-bit virtual address of the function to call with the new stack after paging is disabled. @param Context1 The 64-bit virtual address of the context to pass into the EntryPoint function as the first parameter after paging is disabled. @param Context2 The 64-bit virtual address of the context to pass into the EntryPoint function as the second parameter after paging is disabled. @param NewStack The 64-bit virtual address of the new stack to use for the EntryPoint function after paging is disabled. **/ VOID EFIAPI AsmDisablePaging64 ( IN UINT16 CodeSelector, IN UINT32 EntryPoint, IN UINT32 Context1, OPTIONAL IN UINT32 Context2, OPTIONAL IN UINT32 NewStack ); // // 16-bit thunking services // /** Retrieves the properties for 16-bit thunk functions. Computes the size of the buffer and stack below 1MB required to use the AsmPrepareThunk16(), AsmThunk16() and AsmPrepareAndThunk16() functions. This buffer size is returned in RealModeBufferSize, and the stack size is returned in ExtraStackSize. If parameters are passed to the 16-bit real mode code, then the actual minimum stack size is ExtraStackSize plus the maximum number of bytes that need to be passed to the 16-bit real mode code. If RealModeBufferSize is NULL, then ASSERT(). If ExtraStackSize is NULL, then ASSERT(). @param RealModeBufferSize A pointer to the size of the buffer below 1MB required to use the 16-bit thunk functions. @param ExtraStackSize A pointer to the extra size of stack below 1MB that the 16-bit thunk functions require for temporary storage in the transition to and from 16-bit real mode. **/ VOID EFIAPI AsmGetThunk16Properties ( OUT UINT32 *RealModeBufferSize, OUT UINT32 *ExtraStackSize ); /** Prepares all structures a code required to use AsmThunk16(). Prepares all structures and code required to use AsmThunk16(). If ThunkContext is NULL, then ASSERT(). @param ThunkContext A pointer to the context structure that describes the 16-bit real mode code to call. **/ VOID EFIAPI AsmPrepareThunk16 ( OUT THUNK_CONTEXT *ThunkContext ); /** Transfers control to a 16-bit real mode entry point and returns the results. Transfers control to a 16-bit real mode entry point and returns the results. AsmPrepareThunk16() must be called with ThunkContext before this function is used. If ThunkContext is NULL, then ASSERT(). If AsmPrepareThunk16() was not previously called with ThunkContext, then ASSERT(). @param ThunkContext A pointer to the context structure that describes the 16-bit real mode code to call. **/ VOID EFIAPI AsmThunk16 ( IN OUT THUNK_CONTEXT *ThunkContext ); /** Prepares all structures and code for a 16-bit real mode thunk, transfers control to a 16-bit real mode entry point, and returns the results. Prepares all structures and code for a 16-bit real mode thunk, transfers control to a 16-bit real mode entry point, and returns the results. If the caller only need to perform a single 16-bit real mode thunk, then this service should be used. If the caller intends to make more than one 16-bit real mode thunk, then it is more efficient if AsmPrepareThunk16() is called once and AsmThunk16() can be called for each 16-bit real mode thunk. If ThunkContext is NULL, then ASSERT(). @param ThunkContext A pointer to the context structure that describes the 16-bit real mode code to call. **/ VOID EFIAPI AsmPrepareAndThunk16 ( IN OUT THUNK_CONTEXT *ThunkContext ); #endif