Add RegisterExceptionHandler for PeiCpuExceptionHandlerLib instance

Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
---
 UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c
index 940d83a92f..1c3012b770 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c
@@ -100,6 +100,42 @@ CommonExceptionHandler (
   CommonExceptionHandlerWorker (ExceptionType, SystemContext, ExceptionHandlerData);
 }
 
+/**
+  Registers a function to be called from the processor interrupt handler.
+
+  This function registers and enables the handler specified by InterruptHandler for a processor
+  interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the
+  handler for the processor interrupt or exception type specified by InterruptType is uninstalled.
+  The installed handler is called once for each processor interrupt or exception.
+  NOTE: This function should be invoked after InitializeCpuExceptionHandlers() is invoked,
+  otherwise EFI_UNSUPPORTED returned.
+
+  @param[in]  InterruptType     Defines which interrupt or exception to hook.
+  @param[in]  InterruptHandler  A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
+                                when a processor interrupt occurs. If this parameter is NULL, then the handler
+                                will be uninstalled.
+
+  @retval EFI_SUCCESS           The handler for the processor interrupt was successfully installed or uninstalled.
+  @retval EFI_ALREADY_STARTED   InterruptHandler is not NULL, and a handler for InterruptType was
+                                previously installed.
+  @retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
+                                previously installed.
+  @retval EFI_UNSUPPORTED       The interrupt specified by InterruptType is not supported,
+                                or this function is not supported.
+**/
+EFI_STATUS
+EFIAPI
+RegisterCpuInterruptHandler (
+  IN EFI_EXCEPTION_TYPE         InterruptType,
+  IN EFI_CPU_INTERRUPT_HANDLER  InterruptHandler
+  )
+{
+  EXCEPTION_HANDLER_DATA  *ExceptionHandlerData;
+
+  ExceptionHandlerData = GetExceptionHandlerData ();
+  return RegisterCpuInterruptHandlerWorker (InterruptType, InterruptHandler, ExceptionHandlerData);
+}
+
 /**
   Initializes all CPU exceptions entries and provides the default exception handlers.
 
@@ -135,7 +171,7 @@ InitializeCpuExceptionHandlers (
   ASSERT (ExceptionHandlerData != NULL);
   ExceptionHandlerData->IdtEntryCount            = CPU_EXCEPTION_NUM;
   ExceptionHandlerData->ReservedVectors          = ReservedVectors;
-  ExceptionHandlerData->ExternalInterruptHandler = NULL;
+  ExceptionHandlerData->ExternalInterruptHandler = AllocateZeroPool (sizeof (EFI_CPU_INTERRUPT_HANDLER) * CPU_EXCEPTION_NUM);
   InitializeSpinLock (&ExceptionHandlerData->DisplayMessageSpinLock);
 
   Status = InitializeCpuExceptionHandlersWorker (VectorInfo, ExceptionHandlerData);
-- 
2.31.1.windows.1



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1. The PEI instance of the lib didn't implement the RegisterCpuInterruptHandler() API. Your patch
    adds the missing implementation. Can you emphasize it in commit message?

>    ExceptionHandlerData->IdtEntryCount            = CPU_EXCEPTION_NUM;
>    ExceptionHandlerData->ReservedVectors          = ReservedVectors;
> -  ExceptionHandlerData->ExternalInterruptHandler = NULL;
> +  ExceptionHandlerData->ExternalInterruptHandler = AllocateZeroPool
> (sizeof (EFI_CPU_INTERRUPT_HANDLER) * CPU_EXCEPTION_NUM);

2. Can you use ExceptionHandlerData->IdtEntryCount instead of CPU_EXCEPTION_NUM?



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