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 9145ebb89daa1448c6ad91842cbe11f6ace0697c..7192b2bf73220e9cbf02343b50017bbb71dd22aa 100644 (file)
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -161,11 +161,10 @@ MemDetect (
   //\r
   // Create memory HOBs\r
   //\r
-  AddMemoryBaseSizeHob (MemoryBase, MemorySize);\r
-  AddMemoryRangeHob (BASE_1MB, MemoryBase);\r
+  AddMemoryRangeHob (BASE_1MB, LowerMemorySize);\r
   AddMemoryRangeHob (0, BASE_512KB + BASE_128KB);\r
 \r
-  MtrrSetMemoryAttribute (BASE_1MB, MemoryBase + MemorySize - BASE_1MB, CacheWriteBack);\r
+  MtrrSetMemoryAttribute (BASE_1MB, LowerMemorySize - BASE_1MB, CacheWriteBack);\r
 \r
   MtrrSetMemoryAttribute (0, BASE_512KB + BASE_128KB, CacheWriteBack);\r
 \r
@@ -175,6 +174,6 @@ MemDetect (
     MtrrSetMemoryAttribute (BASE_4GB, UpperMemorySize, CacheWriteBack);\r
   }\r
 \r
-  return MemoryBase + MemorySize;\r
+  return LowerMemorySize;\r
 }\r
 \r