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MdeModulePkg/MdeModulePkg.dec,.uni: Add NULL pointer detection PCD

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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.uni
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@@ -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"