diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h index 8e7b87cbda..7edf0051a0 100644 --- a/MdePkg/Include/Library/BaseLib.h +++ b/MdePkg/Include/Library/BaseLib.h @@ -7831,6 +7831,23 @@ AsmLfence ( VOID ); +/** + Executes a XGETBV instruction + + Executes a XGETBV instruction. This function is only available on IA-32 and + x64. + + @param[in] Index Extended control register index + + @return The current value of the extended control register +**/ +UINT64 +EFIAPI +AsmXGetBv ( + IN UINT32 Index + ); + + /** Patch the immediate operand of an IA32 or X64 instruction such that the byte, word, dword or qword operand is encoded at the end of the instruction's diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf index c740a819ca..3b93b5db8d 100644 --- a/MdePkg/Library/BaseLib/BaseLib.inf +++ b/MdePkg/Library/BaseLib/BaseLib.inf @@ -183,6 +183,7 @@ Ia32/EnableCache.nasm| GCC Ia32/DisableCache.nasm| GCC Ia32/RdRand.nasm + Ia32/XGetBv.nasm Ia32/DivS64x64Remainder.c Ia32/InternalSwitchStack.c | MSFT @@ -315,6 +316,7 @@ X64/EnableDisableInterrupts.nasm X64/DisablePaging64.nasm X64/RdRand.nasm + X64/XGetBv.nasm ChkStkGcc.c | GCC [Sources.EBC] diff --git a/MdePkg/Library/BaseLib/Ia32/XGetBv.nasm b/MdePkg/Library/BaseLib/Ia32/XGetBv.nasm new file mode 100644 index 0000000000..9f7b03bbff --- /dev/null +++ b/MdePkg/Library/BaseLib/Ia32/XGetBv.nasm @@ -0,0 +1,31 @@ +;------------------------------------------------------------------------------ +; +; Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.
+; SPDX-License-Identifier: BSD-2-Clause-Patent +; +; Module Name: +; +; XGetBv.Asm +; +; Abstract: +; +; AsmXgetBv function +; +; Notes: +; +;------------------------------------------------------------------------------ + + SECTION .text + +;------------------------------------------------------------------------------ +; UINT64 +; EFIAPI +; AsmXGetBv ( +; IN UINT32 Index +; ); +;------------------------------------------------------------------------------ +global ASM_PFX(AsmXGetBv) +ASM_PFX(AsmXGetBv): + mov ecx, [esp + 4] + xgetbv + ret diff --git a/MdePkg/Library/BaseLib/X64/XGetBv.nasm b/MdePkg/Library/BaseLib/X64/XGetBv.nasm new file mode 100644 index 0000000000..09f3be8ae0 --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/XGetBv.nasm @@ -0,0 +1,34 @@ +;------------------------------------------------------------------------------ +; +; Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.
+; SPDX-License-Identifier: BSD-2-Clause-Patent +; +; Module Name: +; +; XGetBv.Asm +; +; Abstract: +; +; AsmXgetBv function +; +; Notes: +; +;------------------------------------------------------------------------------ + + DEFAULT REL + SECTION .text + +;------------------------------------------------------------------------------ +; UINT64 +; EFIAPI +; AsmXGetBv ( +; IN UINT32 Index +; ); +;------------------------------------------------------------------------------ +global ASM_PFX(AsmXGetBv) +ASM_PFX(AsmXGetBv): + xgetbv + shl rdx, 32 + or rax, rdx + ret +