Cc: Star Zeng <star.z...@intel.com> Cc: Eric Dong <eric.d...@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jian J Wang <jian.j.w...@intel.com> --- MdeModulePkg/MdeModulePkg.dec | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index 8efad57766..d134ec798a 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -939,13 +939,17 @@ gEfiMdeModulePkgTokenSpaceGuid.PcdHeapGuardPoolType|0x0|UINT64|0x30001053 ## This mask is to control Heap Guard behavior. + # Note that due to the limit in 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 -- 2.15.1.windows.2 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
