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MdeModulePkg: Clarify usage of PcdHeapGuardPropertyMask

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Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@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>
This commit is contained in:
Jian J Wang
2017-12-21 13:06:24 +08:00
committed by Star Zeng
parent 7155d0a68c
commit 3d0ebaa8d8
2 changed files with 12 additions and 4 deletions
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8
MdeModulePkg/MdeModulePkg.dec
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@@ -939,13 +939,17 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdHeapGuardPoolType|0x0|UINT64|0x30001053
## This mask is to control Heap Guard behavior.
# Note that due to the limit of pool memory implementation and the alignment
# requirement of UEFI spec, BIT7 is a try-best setting which cannot guarantee
# that the returned pool is exactly adjacent to head guard page or tail guard
# page.
# BIT0 - Enable UEFI page guard.<BR>
# BIT1 - Enable UEFI pool guard.<BR>
# BIT2 - Enable SMM page guard.<BR>
# BIT3 - Enable SMM pool guard.<BR>
# BIT7 - The direction of Guard Page for Pool Guard.
# 0 - The returned pool is adjacent to the bottom guard page.<BR>
# 1 - The returned pool is adjacent to the top guard page.<BR>
# 0 - The returned pool is near the tail guard page.<BR>
# 1 - The returned pool is near the head guard page.<BR>
# @Prompt The Heap Guard feature mask
gEfiMdeModulePkgTokenSpaceGuid.PcdHeapGuardPropertyMask|0x0|UINT8|0x30001054