UefiCpuPkg/CpuDxe: introduce ResetApStackless()

If timeout expires before AP returns from Procedure, the AP should
be terminated, we introduce ResetApStackLess() to send init IPI
to let AP exit Procedurce and re-available.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16366 6f19259b-4bc3-4df7-8a09-765794883524

UefiCpuPkg/CpuDxe/ApStartup.c

@@ -328,3 +328,20 @@ StartApsStackless (
   return EFI_SUCCESS;
 }
 
+/**
+  Resets the Application Processor and directs it to jump to the
+  specified routine.
+
+  The processor jumps to this code in flat mode, but the processor's
+  stack is not initialized.
+
+  @param ProcessorId           the AP of ProcessorId was reset
+**/
+VOID
+ResetApStackless (
+  IN UINT32 ProcessorId
+  )
+{
+  SendInitSipiSipi (ProcessorId,
+                    (UINT32)(UINTN)(VOID*) StartupCode);
+}