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UefiCpuPkg/PiSmmCpuDxeSmm: Enable/Restore XD in SMM

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If XD is supported, then SMM enables it.  The non-SMM execution
environment can choose to enable or disable XD, so the state of
XD must be detected in each SMI and be enabled/restored.

Cc: Jeff Fan <jeff.fan@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Michael Kinney
2016-02-18 13:09:23 -08:00
parent d691abec1b
commit e1695f8dcf
2 changed files with 16 additions and 3 deletions
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UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.h
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@@ -21,6 +21,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
/// MSR Register Index
///
#define MSR_IA32_MISC_ENABLE 0x1A0
#define B_XD_DISABLE_BIT BIT34
//
// External functions