Create new functions to abstract how XD/NX is detected, enabled, and disabled. Also, create a new function to determine if Branch Trace Storage is supported. Existing code is specific to Intel processors.
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Joseph Shifflett <joseph.shiffl...@hpe.com> --- UefiCpuPkg/Include/Library/SmmCpuFeaturesLib.h | 37 ++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/UefiCpuPkg/Include/Library/SmmCpuFeaturesLib.h b/UefiCpuPkg/Include/Library/SmmCpuFeaturesLib.h index 4478003467c8..48b4565b49bb 100644 --- a/UefiCpuPkg/Include/Library/SmmCpuFeaturesLib.h +++ b/UefiCpuPkg/Include/Library/SmmCpuFeaturesLib.h @@ -2,6 +2,7 @@ Library that provides CPU specific functions to support the PiSmmCpuDxeSmm module. Copyright (c) 2015, Intel Corporation. All rights reserved.<BR> +(C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR> 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 @@ -398,4 +399,40 @@ SmmCpuFeaturesAllocatePageTableMemory ( IN UINTN Pages ); +/** + This API provides a method to determine if XD/NX support has been forced off in + the non-SMM execution environment. It will enable XD/NX support while in SMM + + @retval TRUE XD/NX was disabled when runningn in the non-SMM execution environment + @retval FALSE XD/NX was enabled when runningn in the non-SMM execution environment + +**/ +BOOLEAN +EFIAPI +SmmCpuFeaturesCheckAndEnableXdSupport ( + VOID + ); + +/** + This API provides a method to disable XD/NX support before exiting SMM +**/ +VOID +EFIAPI +SmmCpuFeaturesDisableXdSupport ( + VOID + ); + +/** + This API determines if Branch Trace Storage Support is currently available + + @retval TRUE BTS is available + @retval FALSE BTS is disabled + +**/ +BOOLEAN +EFIAPI +SmmCpuFeaturesConfirmBranchTraceStorageSupport ( + VOID + ); + #endif -- 2.7.4 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
