tyler.durden/audk
1
0
Fork 0
mirror of https://github.com/acidanthera/audk.git synced 2025-07-21 12:44:50 +02:00
Code Issues Packages Projects Releases Wiki Activity

MdePkg/BaseLib: Use PcdSpeculationBarrierType

Browse Source 
Use PcdSpeculationBarrierType in the x86 implementation
of SpeculationBarrier() to select between AsmLfence(),
AsmCpuid(), and no operation.

Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Brian J. Johnson <brian.johnson@hpe.com>
This commit is contained in:
Michael D Kinney 2019-04-24 14:06:32 -07:00
parent a41b12574e
commit aec7465689
2 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
MdePkg/Library/BaseLib/BaseLib.inf
View File

@ -394,6 +394,7 @@
gEfiMdePkgTokenSpaceGuid.PcdMaximumAsciiStringLength ## SOMETIMES_CONSUMES gEfiMdePkgTokenSpaceGuid.PcdMaximumAsciiStringLength ## SOMETIMES_CONSUMES
gEfiMdePkgTokenSpaceGuid.PcdMaximumUnicodeStringLength ## SOMETIMES_CONSUMES gEfiMdePkgTokenSpaceGuid.PcdMaximumUnicodeStringLength ## SOMETIMES_CONSUMES
gEfiMdePkgTokenSpaceGuid.PcdControlFlowEnforcementPropertyMask ## SOMETIMES_CONSUMES gEfiMdePkgTokenSpaceGuid.PcdControlFlowEnforcementPropertyMask ## SOMETIMES_CONSUMES
gEfiMdePkgTokenSpaceGuid.PcdSpeculationBarrierType ## SOMETIMES_CONSUMES
[FeaturePcd] [FeaturePcd]
gEfiMdePkgTokenSpaceGuid.PcdVerifyNodeInList ## CONSUMES gEfiMdePkgTokenSpaceGuid.PcdVerifyNodeInList ## CONSUMES

6
MdePkg/Library/BaseLib/X86SpeculationBarrier.c
View File

@ -1,7 +1,7 @@
/** @file /** @file
SpeculationBarrier() function for IA32 and x64. SpeculationBarrier() function for IA32 and x64.
Copyright (C) 2018, Intel Corporation. All rights reserved.<BR> Copyright (C) 2018 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent SPDX-License-Identifier: BSD-2-Clause-Patent
@ -22,5 +22,9 @@ SpeculationBarrier (
VOID VOID
) )
{ {
if (PcdGet8 (PcdSpeculationBarrierType) == 0x01) {
AsmLfence (); AsmLfence ();
} else if (PcdGet8 (PcdSpeculationBarrierType) == 0x02) {
AsmCpuid (0x01, NULL, NULL, NULL, NULL);
}
} }