[edk2-devel] [PATCH 2/2] UefiCpuPkg: Check lower 24 bits of ProcessorNumber

["duntan" <dun.tan@intel.com>]

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>
---
 UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c b/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c
index 3af4911d4b..b804e400e6 100644
--- a/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c
+++ b/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c
@@ -106,7 +106,10 @@ MpInitLibGetProcessorInfo (
     return EFI_INVALID_PARAMETER;
   }
 
-  if (ProcessorNumber != 0) {
+  //
+  // Lower 24 bits contains the actual processor number.
+  //
+  if ((ProcessorNumber & (CPU_V2_EXTENDED_TOPOLOGY - 1)) != 0) {
     return EFI_NOT_FOUND;
   }
 
-- 
2.31.1.windows.1



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