From aa1cd447b346e8cc8141df2fe2d321b032c08acb Mon Sep 17 00:00:00 2001
From: "Liu, Zhiguang" <Zhiguang.Liu@intel.com>
Date: Tue, 7 Mar 2023 14:31:36 +0800
Subject: UefiCpuPkg: Calculate DisplayFamily correctly

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4348

Per SDM:
DisplayFamily = Extended_Family_ID + Family_ID.
DisplayModelID = (Extended_Model_ID << 4) + Family_ID.
Correct the related code.

Cc: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Cc: Mike Maslenkin <mike.maslenkin@gmail.com>
Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
---
 UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'UefiCpuPkg/Library')

diff --git a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
index a8e4f92..552fdab 100644
--- a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
+++ b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
@@ -1,7 +1,7 @@
 /** @file
   CPU Features Initialize functions.
 
-  Copyright (c) 2017 - 2021, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2017 - 2023, Intel Corporation. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
@@ -67,12 +67,12 @@ FillProcessorInfo (
 
   DisplayedFamily = Eax.Bits.FamilyId;
   if (Eax.Bits.FamilyId == 0x0F) {
-    DisplayedFamily |= (Eax.Bits.ExtendedFamilyId << 4);
+    DisplayedFamily += Eax.Bits.ExtendedFamilyId;
   }
 
   DisplayedModel = Eax.Bits.Model;
   if ((Eax.Bits.FamilyId == 0x06) || (Eax.Bits.FamilyId == 0x0f)) {
-    DisplayedModel |= (Eax.Bits.ExtendedModelId << 4);
+    DisplayedModel += (Eax.Bits.ExtendedModelId << 4);
   }
 
   CpuInfo->DisplayFamily              = DisplayedFamily;
-- 
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