From: Laszlo Ersek <lersek@redhat.com>
Date: Thu, 26 Dec 2013 20:44:20 +0000 (+0000)
Subject: OvmfPkg: PlatformPei: simplify memory range expressions in MemDetect()
X-Git-Tag: edk2-stable201903~11935
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=9ab36385be96377cd97299a975ca9456bbfd887b

OvmfPkg: PlatformPei: simplify memory range expressions in MemDetect()

Exploit that (MemoryBase + MemorySize) always equals LowerMemorySize.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15022 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 9145ebb89d..7192b2bf73 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -161,11 +161,10 @@ MemDetect (
   //
   // Create memory HOBs
   //
-  AddMemoryBaseSizeHob (MemoryBase, MemorySize);
-  AddMemoryRangeHob (BASE_1MB, MemoryBase);
+  AddMemoryRangeHob (BASE_1MB, LowerMemorySize);
   AddMemoryRangeHob (0, BASE_512KB + BASE_128KB);
 
-  MtrrSetMemoryAttribute (BASE_1MB, MemoryBase + MemorySize - BASE_1MB, CacheWriteBack);
+  MtrrSetMemoryAttribute (BASE_1MB, LowerMemorySize - BASE_1MB, CacheWriteBack);
 
   MtrrSetMemoryAttribute (0, BASE_512KB + BASE_128KB, CacheWriteBack);
 
@@ -175,6 +174,6 @@ MemDetect (
     MtrrSetMemoryAttribute (BASE_4GB, UpperMemorySize, CacheWriteBack);
   }
 
-  return MemoryBase + MemorySize;
+  return LowerMemorySize;
 }