From 08a6528bac384a7a8baa7e77075dea3291ac36fc Mon Sep 17 00:00:00 2001
From: duntan <dun.tan@intel.com>
Date: Mon, 8 Jan 2024 13:08:04 +0800
Subject: UefiCpuPkg: Check lower 24 bits of ProcessorNumber

Check lower 24 bits of ProcessorNumber instead of
the value of ProcessorNumber in the API
MpInitLibGetProcessorInfo() of MpInitLibUp instance.
Lower 24 bits of ProcessorNumber contains the actual
processor number.
The BIT24 of input ProcessorNumber might be set to
indicate if the EXTENDED_PROCESSOR_INFORMATION will
be retrived.

Signed-off-by: Dun Tan <dun.tan@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Min Xu <min.m.xu@intel.com>
Message-Id: <20240108050804.1718-3-dun.tan@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
---
 UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'UefiCpuPkg/Library')

diff --git a/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c b/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c
index d4f8611af8..35590fb4e7 100644
--- a/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c
+++ b/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c
@@ -107,7 +107,10 @@ MpInitLibGetProcessorInfo (
     return EFI_INVALID_PARAMETER;
   }
 
-  if (ProcessorNumber != 0) {
+  //
+  // Lower 24 bits contains the actual processor number.
+  //
+  if ((ProcessorNumber & (BIT24 - 1)) != 0) {
     return EFI_NOT_FOUND;
   }
 
-- 
cgit v1.2.3