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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>
This commit is contained in:
Wang, Jian J 2017-08-26 09:08:10 +08:00 committed by Eric Dong
parent 92d07e4890
commit f7e077768f
2 changed files with 26 additions and 0 deletions
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13
MdeModulePkg/MdeModulePkg.dec
View File

@ -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

13
MdeModulePkg/MdeModulePkg.uni
View File

@ -1127,3 +1127,16 @@
"enabled on AMD processors supporting the Secure Encrypted Virtualization (SEV) feature.\n"
"This mask should be applied when creating 1:1 virtual to physical mapping tables."
#string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdNullPointerDetectionPropertyMask_PROMPT #language en-US "Enable NULL pointer detection"
#string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdNullPointerDetectionPropertyMask_HELP #language en-US "Mask to control the NULL address detection in code for different phases.\n"
" If enabled, accessing NULL address in UEFI or SMM code can be caught.\n\n"
" BIT0 - Enable NULL pointer detection for UEFI.\n"
" BIT1 - Enable NULL pointer detection for SMM.\n"
" BIT2..6 - Reserved for future uses.\n"
" 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.\n"