Update PeiServicesTablePointerLib instance to add new API MigratePeiServicesTablePointer

[mirror_edk2.git] / EmulatorPkg / Library / PeiCoreServicesTablePointerLib / PeiServicesTablePointer.c

diff --git a/EmulatorPkg/Library/PeiCoreServicesTablePointerLib/PeiServicesTablePointer.c b/EmulatorPkg/Library/PeiCoreServicesTablePointerLib/PeiServicesTablePointer.c
index 10f588843d002400823aae3f061ab0bcc4bcded9..06f995b0d37819eab6650d235fdd09a020b4913a 100644 (file)
--- a/EmulatorPkg/Library/PeiCoreServicesTablePointerLib/PeiServicesTablePointer.c
+++ b/EmulatorPkg/Library/PeiCoreServicesTablePointerLib/PeiServicesTablePointer.c
@@ -88,4 +88,30 @@ PeiServicesTablePointerLibConstructor (
   return EFI_SUCCESS;\r
 }\r
 \r
+/**\r
+  Perform CPU specific actions required to migrate the PEI Services Table \r
+  pointer from temporary RAM to permanent RAM.\r
+\r
+  For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes \r
+  immediately preceding the Interrupt Descriptor Table (IDT) in memory.\r
+  For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes \r
+  immediately preceding the Interrupt Descriptor Table (IDT) in memory.\r
+  For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in\r
+  a dedicated CPU register.  This means that there is no memory storage \r
+  associated with storing the PEI Services Table pointer, so no additional \r
+  migration actions are required for Itanium or ARM CPUs.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+MigratePeiServicesTablePointer (\r
+  VOID\r
+  )\r
+{\r
+  //\r
+  //  PEI Services Table pointer is cached in the global variable. No additional \r
+  //  migration actions are required.\r
+  //\r
+  return;\r
+}\r
 \r