Revert "XhciDxe: Use common buffer for AsyncInterruptTransfer"

[mirror_edk2.git] / MdeModulePkg / MdeModulePkg.dec

diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 6037504fa789d4ca96d45bf3a776dd77bc17a909..428eeeb670449499f5e31f1529b886dbca107725 100644 (file)
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -955,6 +955,8 @@
   # free pages for all of them. The page allocation for the type related to\r
   # cleared bits keeps the same as ususal.\r
   #\r
+  # This PCD is only valid if BIT0 and/or BIT2 are set in PcdHeapGuardPropertyMask.\r
+  #\r
   # Below is bit mask for this PCD: (Order is same as UEFI spec)<BR>\r
   #  EfiReservedMemoryType             0x0000000000000001<BR>\r
   #  EfiLoaderCode                     0x0000000000000002<BR>\r
@@ -984,6 +986,8 @@
   # if there's enough free memory for all of them. The pool allocation for the\r
   # type related to cleared bits keeps the same as ususal.\r
   #\r
+  # This PCD is only valid if BIT1 and/or BIT3 are set in PcdHeapGuardPropertyMask.\r
+  #\r
   # Below is bit mask for this PCD: (Order is same as UEFI spec)<BR>\r
   #  EfiReservedMemoryType             0x0000000000000001<BR>\r
   #  EfiLoaderCode                     0x0000000000000002<BR>\r
@@ -1007,14 +1011,22 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdHeapGuardPoolType|0x0|UINT64|0x30001053\r
 \r
   ## This mask is to control Heap Guard behavior.\r
-  # Note that due to the limit of pool memory implementation and the alignment\r
-  # requirement of UEFI spec, BIT7 is a try-best setting which cannot guarantee\r
-  # that the returned pool is exactly adjacent to head guard page or tail guard\r
-  # page.\r
+  #\r
+  # Note:\r
+  #   a) Heap Guard is for debug purpose and should not be enabled in product\r
+  #      BIOS.\r
+  #   b) Due to the limit of pool memory implementation and the alignment\r
+  #      requirement of UEFI spec, BIT7 is a try-best setting which cannot\r
+  #      guarantee that the returned pool is exactly adjacent to head guard\r
+  #      page or tail guard page.\r
+  #   c) UEFI freed-memory guard and UEFI pool/page guard cannot be enabled\r
+  #      at the same time.\r
+  #\r
   #   BIT0 - Enable UEFI page guard.<BR>\r
   #   BIT1 - Enable UEFI pool guard.<BR>\r
   #   BIT2 - Enable SMM page guard.<BR>\r
   #   BIT3 - Enable SMM pool guard.<BR>\r
+  #   BIT4 - Enable UEFI freed-memory guard (Use-After-Free memory detection).<BR>\r
   #   BIT6 - Enable non-stop mode.<BR>\r
   #   BIT7 - The direction of Guard Page for Pool Guard.\r
   #          0 - The returned pool is near the tail guard page.<BR>\r