From 947a573ada499a7b1533d91f015327cc07605ff7 Mon Sep 17 00:00:00 2001
From: xli24 <xli24@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 10 Mar 2010 02:38:39 +0000
Subject: Add Checking for MTRR existence.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10223 6f19259b-4bc3-4df7-8a09-765794883524
---
 UefiCpuPkg/CpuDxe/CpuDxe.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'UefiCpuPkg/CpuDxe')

diff --git a/UefiCpuPkg/CpuDxe/CpuDxe.c b/UefiCpuPkg/CpuDxe/CpuDxe.c
index 457823d5cd..e3b21d8463 100644
--- a/UefiCpuPkg/CpuDxe/CpuDxe.c
+++ b/UefiCpuPkg/CpuDxe/CpuDxe.c
@@ -590,6 +590,10 @@ CpuSetMemoryAttributes (
   RETURN_STATUS             Status;
   MTRR_MEMORY_CACHE_TYPE    CacheType;
 
+  if (!IsMtrrSupported ()) {
+    return EFI_UNSUPPORTED;
+  }
+
   DEBUG((EFI_D_ERROR, "CpuAp: SetMemorySpaceAttributes(BA=%08x, Len=%08x, Attr=%08x)\n", BaseAddress, Length, Attributes));
 
   //
@@ -856,6 +860,10 @@ RefreshGcdMemoryAttributes (
   MTRR_FIXED_SETTINGS                 MtrrFixedSettings;
   UINT32                              FirmwareVariableMtrrCount;
 
+  if (!IsMtrrSupported ()) {
+    return;
+  }
+
   FirmwareVariableMtrrCount = GetFirmwareVariableMtrrCount ();
   ASSERT (FirmwareVariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);
 
-- 
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