IntelSiliconPkg IntelVTdPmrPei: Refine comments about PHMR/PLMR.Limit

According to VTd spec, the real hardware decoded limit should be
PHMR/PLMR.Limit value + alignment value.

"Bits N:0 of the limit register are
decoded by hardware as all 1s."

Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

diff --git a/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c b/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
index 7147a19f538a436b59dfef1452cb7ccc1ae52077..8f86d4cd15c0c128a0a7d7f56f037a27c1d8597a 100644 (file)
--- a/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
+++ b/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
@@ -1,6 +1,6 @@
 /** @file\r
 \r
 /** @file\r
 \r

-  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>\r
+  Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>\r

 \r
   This program and the accompanying materials are licensed and made available under\r
   the terms and conditions of the BSD License which accompanies this distribution.\r
 \r
   This program and the accompanying materials are licensed and made available under\r
   the terms and conditions of the BSD License which accompanies this distribution.\r


@@ -60,7 +60,7 @@ typedef struct {
 \r
   PEI Memory Layout:\r
 \r
 \r
   PEI Memory Layout:\r
 \r

-              +------------------+ <=============== PHMR.Limit (Top of memory)\r
+              +------------------+ <=============== PHMR.Limit (+ alignment) (Top of memory)\r

               |   Mem Resource   |\r
               |                  |\r
 \r
               |   Mem Resource   |\r
               |                  |\r
 \r


@@ -72,7 +72,7 @@ typedef struct {
   DMA Buffer  |   * DMA FREE *   |\r
        |      |  --------------  |\r
        V      |  Read/Write Buf  |\r
   DMA Buffer  |   * DMA FREE *   |\r
        |      |  --------------  |\r
        V      |  Read/Write Buf  |\r

-  =========== +==================+ <=============== PLMR.Limit\r
+  =========== +==================+ <=============== PLMR.Limit (+ alignment)\r

               |   PEI allocated  |\r
               |  --------------  | <------- EfiFreeMemoryTop\r
               |   * PEI FREE *   |\r
               |   PEI allocated  |\r
               |  --------------  | <------- EfiFreeMemoryTop\r
               |   * PEI FREE *   |\r