IntelSiliconPkg IntelVTdPmrPei: Refine comments about PHMR/PLMR.Limit

[edk2] [PATCH] IntelSiliconPkg IntelVTdPmrPei: Refine comments about PHMR/PLMR.Limit

Posted by Star Zeng 6 years, 11 months ago

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>
---
 IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c b/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
index 7147a19f538a..8f86d4cd15c0 100644
--- a/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
+++ b/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
@@ -1,6 +1,6 @@
 /** @file
 
-  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
 
   This program and the accompanying materials are licensed and made available under
   the terms and conditions of the BSD License which accompanies this distribution.
@@ -60,7 +60,7 @@ typedef struct {
 
   PEI Memory Layout:
 
-              +------------------+ <=============== PHMR.Limit (Top of memory)
+              +------------------+ <=============== PHMR.Limit (+ alignment) (Top of memory)
               |   Mem Resource   |
               |                  |
 
@@ -72,7 +72,7 @@ typedef struct {
   DMA Buffer  |   * DMA FREE *   |
        |      |  --------------  |
        V      |  Read/Write Buf  |
-  =========== +==================+ <=============== PLMR.Limit
+  =========== +==================+ <=============== PLMR.Limit (+ alignment)
               |   PEI allocated  |
               |  --------------  | <------- EfiFreeMemoryTop
               |   * PEI FREE *   |
-- 
2.13.3.windows.1

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Re: [edk2] [PATCH] IntelSiliconPkg IntelVTdPmrPei: Refine comments about PHMR/PLMR.Limit

Posted by Yao, Jiewen 6 years, 11 months ago

Reviewed-by: Jiewen.yao@intel.com

> -----Original Message-----
> From: Zeng, Star
> Sent: Tuesday, January 16, 2018 4:58 PM
> To: edk2-devel@lists.01.org
> Cc: Zeng, Star <star.zeng@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>
> Subject: [PATCH] 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>
> ---
>  IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
> b/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
> index 7147a19f538a..8f86d4cd15c0 100644
> --- a/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
> +++ b/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/IntelVTdPmrPei.c
> @@ -1,6 +1,6 @@
>  /** @file
> 
> -  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
> +  Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
> 
>    This program and the accompanying materials are licensed and made
> available under
>    the terms and conditions of the BSD License which accompanies this
> distribution.
> @@ -60,7 +60,7 @@ typedef struct {
> 
>    PEI Memory Layout:
> 
> -              +------------------+ <=============== PHMR.Limit (Top of
> memory)
> +              +------------------+ <=============== PHMR.Limit (+
> alignment) (Top of memory)
>                |   Mem Resource   |
>                |                  |
> 
> @@ -72,7 +72,7 @@ typedef struct {
>    DMA Buffer  |   * DMA FREE *   |
>         |      |  --------------  |
>         V      |  Read/Write Buf  |
> -  =========== +==================+ <=============== PLMR.Limit
> +  =========== +==================+ <=============== PLMR.Limit (+
> alignment)
>                |   PEI allocated  |
>                |  --------------  | <------- EfiFreeMemoryTop
>                |   * PEI FREE *   |
> --
> 2.13.3.windows.1

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