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author | Wang, Jian J <jian.j.wang@intel.com> | 2017-08-26 09:08:10 +0800 |
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committer | Eric Dong <eric.dong@intel.com> | 2017-10-11 16:39:00 +0800 |
commit | f7e077768fe47075130bfa774c88c331d2ad54ff (patch) | |
tree | bb49893cba369c49a7538f810ea5e7f9f0ee76c9 /MdeModulePkg/MdeModulePkg.dec | |
parent | 92d07e48907f54a0da01663f3e876782a76b1e18 (diff) | |
download | edk2-f7e077768fe47075130bfa774c88c331d2ad54ff.tar.gz edk2-f7e077768fe47075130bfa774c88c331d2ad54ff.tar.bz2 edk2-f7e077768fe47075130bfa774c88c331d2ad54ff.zip |
MdeModulePkg/MdeModulePkg.dec,.uni: Add NULL pointer detection PCD
PCD PcdNullPointerDetectionPropertyMask is a bitmask used to control the
NULL address detection functionality in code for different phases.
If enabled, accessing NULL address in UEFI or SMM code can be caught
as a page fault exception.
BIT0 - Enable NULL pointer detection for UEFI.
BIT1 - Enable NULL pointer detection for SMM.
BIT2..6 - Reserved for future uses.
BIT7 - Disable NULL pointer detection just after EndOfDxe. This is a
workaround for those unsolvable NULL access issues in
OptionROM, boot loader, etc. It can also help to avoid
unnecessary exception caused by legacy memory (0-4095) access
after EndOfDxe, such as Windows 7 boot on Qemu.
Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Ayellet Wolman <ayellet.wolman@intel.com>
Suggested-by: Ayellet Wolman <ayellet.wolman@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Diffstat (limited to 'MdeModulePkg/MdeModulePkg.dec')
-rw-r--r-- | MdeModulePkg/MdeModulePkg.dec | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index a3c0633ee1..9248d10da8 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -867,6 +867,19 @@ # @ValidList 0x80000006 | 0x03058002
gEfiMdeModulePkgTokenSpaceGuid.PcdErrorCodeSetVariable|0x03058002|UINT32|0x30001040
+ ## Mask to control the NULL address detection in code for different phases.
+ # If enabled, accessing NULL address in UEFI or SMM code can be caught.<BR><BR>
+ # BIT0 - Enable NULL pointer detection for UEFI.<BR>
+ # BIT1 - Enable NULL pointer detection for SMM.<BR>
+ # BIT2..6 - Reserved for future uses.<BR>
+ # BIT7 - Disable NULL pointer detection just after EndOfDxe. <BR>
+ # This is a workaround for those unsolvable NULL access issues in
+ # OptionROM, boot loader, etc. It can also help to avoid unnecessary
+ # exception caused by legacy memory (0-4095) access after EndOfDxe,
+ # such as Windows 7 boot on Qemu.<BR>
+ # @Prompt Enable NULL address detection.
+ gEfiMdeModulePkgTokenSpaceGuid.PcdNullPointerDetectionPropertyMask|0x0|UINT8|0x30001050
+
[PcdsFixedAtBuild, PcdsPatchableInModule]
## Dynamic type PCD can be registered callback function for Pcd setting action.
# PcdMaxPeiPcdCallBackNumberPerPcdEntry indicates the maximum number of callback function
|