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MdeModulePkg CapsuleX64: Reduce reserved memory consumption

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We are going to reduce reserved memory consumption by page table buffer,
then OS can have more available memory to use.
Take PhysicalAddressBits = 48 and 2MB page granularity as example,
1:1 Virtual to Physical identity mapping page table buffer needs to be
((512 + 1) * 512 + 1) * 4096 = 1075843072 bytes = 0x40201000 bytes.

The code is updated to build 4G page table by default and only use 8 extra
pages to handles > 4G request by page fault.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18069 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Star Zeng
2015-07-27 03:04:41 +00:00
committed by lzeng14
parent 353f5ba92f
commit 716087e2be
6 changed files with 478 additions and 132 deletions
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4
MdeModulePkg/Universal/CapsulePei/CapsuleX64.inf
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@@ -9,7 +9,7 @@
# This external input must be validated carefully to avoid security issue like
# buffer overflow, integer overflow.
#
# Copyright (c) 2011 - 2014, Intel Corporation. All rights reserved.<BR>
# Copyright (c) 2011 - 2015, Intel Corporation. All rights reserved.<BR>
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions
@@ -38,6 +38,8 @@
[Sources]
X64/X64Entry.c
X64/PageFaultHandler.asm
X64/PageFaultHandler.S
Common/CapsuleCoalesce.c
[Packages]