[edk2-devel] [Patch V2 1/2] UefiCpuPkg: set EXTENDED_PROCESSOR_INFORMATION to 0

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

Set EXTENDED_PROCESSOR_INFORMATION to 0 in API
MpInitLibGetProcessorInfo() of MpInitLibUp. This
commit use ZeroMem() to set all fileds in output
EFI_PROCESSOR_INFORMATION to 0 before StatusFlag
field is reassigned.

Previously EXTENDED_PROCESSOR_INFORMATION in the API
MpInitLibGetProcessorInfo() of MpInitLibUp is ignored.
In PEI/DXE MpInitLib, EXTENDED_PROCESSOR_INFORMATION
will be retrived when BIT24 of input ProcessorNumber
is set. This commit can avoid garbage in the output
structure in MpInitLibGetProcessorInfo() of MpInitLibUp.

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/Include/Library/MpInitLib.h       |  2 ++
 UefiCpuPkg/Library/MpInitLib/MpLib.c         |  2 ++
 UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c | 14 +++++++-------
 3 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/UefiCpuPkg/Include/Library/MpInitLib.h b/UefiCpuPkg/Include/Library/MpInitLib.h
index 1853c46415..842c6f7ff9 100644
--- a/UefiCpuPkg/Include/Library/MpInitLib.h
+++ b/UefiCpuPkg/Include/Library/MpInitLib.h
@@ -63,6 +63,8 @@ MpInitLibGetNumberOfProcessors (
   instant this call is made. This service may only be called from the BSP.
 
   @param[in]  ProcessorNumber       The handle number of processor.
+                                    Lower 24 bits contains the actual processor number.
+                                    BIT24 indicates if the EXTENDED_PROCESSOR_INFORMATION will be retrived.
   @param[out] ProcessorInfoBuffer   A pointer to the buffer where information for
                                     the requested processor is deposited.
   @param[out] HealthData            Return processor health data.
diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c b/UefiCpuPkg/Library/MpInitLib/MpLib.c
index a359906923..cdfb570e61 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
@@ -2333,6 +2333,8 @@ MpInitLibInitialize (
   instant this call is made. This service may only be called from the BSP.
 
   @param[in]  ProcessorNumber       The handle number of processor.
+                                    Lower 24 bits contains the actual processor number.
+                                    BIT24 indicates if the EXTENDED_PROCESSOR_INFORMATION will be retrived.
   @param[out] ProcessorInfoBuffer   A pointer to the buffer where information for
                                     the requested processor is deposited.
   @param[out]  HealthData            Return processor health data.
diff --git a/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c b/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c
index 86f9fbf903..ea9a45c9c6 100644
--- a/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c
+++ b/UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.c
@@ -77,6 +77,8 @@ MpInitLibGetNumberOfProcessors (
   instant this call is made. This service may only be called from the BSP.
 
   @param[in]  ProcessorNumber       The handle number of processor.
+                                    Lower 24 bits contains the actual processor number.
+                                    BIT24 indicates if the EXTENDED_PROCESSOR_INFORMATION will be retrived.
   @param[out] ProcessorInfoBuffer   A pointer to the buffer where information for
                                     the requested processor is deposited.
   @param[out] HealthData            Return processor health data.
@@ -108,13 +110,11 @@ MpInitLibGetProcessorInfo (
     return EFI_NOT_FOUND;
   }
 
-  ProcessorInfoBuffer->ProcessorId = 0;
-  ProcessorInfoBuffer->StatusFlag  = PROCESSOR_AS_BSP_BIT  |
-                                     PROCESSOR_ENABLED_BIT |
-                                     PROCESSOR_HEALTH_STATUS_BIT;
-  ProcessorInfoBuffer->Location.Package = 0;
-  ProcessorInfoBuffer->Location.Core    = 0;
-  ProcessorInfoBuffer->Location.Thread  = 0;
+  ZeroMem (ProcessorInfoBuffer, sizeof (*ProcessorInfoBuffer));
+  ProcessorInfoBuffer->StatusFlag = PROCESSOR_AS_BSP_BIT  |
+                                    PROCESSOR_ENABLED_BIT |
+                                    PROCESSOR_HEALTH_STATUS_BIT;
+
   if (HealthData != NULL) {
     GuidHob = GetFirstGuidHob (&gEfiSecPlatformInformationPpiGuid);
     if (GuidHob != NULL) {
-- 
2.31.1.windows.1



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