diff options
Diffstat (limited to 'EmulatorPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c')
-rw-r--r-- | EmulatorPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/EmulatorPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c b/EmulatorPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c index c34997854b..5aaf296389 100644 --- a/EmulatorPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c +++ b/EmulatorPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c @@ -133,4 +133,30 @@ PeiServicesTablePointerLibConstructor ( return Status;
}
+/**
+ Perform CPU specific actions required to migrate the PEI Services Table
+ pointer from temporary RAM to permanent RAM.
+
+ For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes
+ immediately preceding the Interrupt Descriptor Table (IDT) in memory.
+ For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes
+ immediately preceding the Interrupt Descriptor Table (IDT) in memory.
+ For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in
+ a dedicated CPU register. This means that there is no memory storage
+ associated with storing the PEI Services Table pointer, so no additional
+ migration actions are required for Itanium or ARM CPUs.
+
+**/
+VOID
+EFIAPI
+MigratePeiServicesTablePointer (
+ VOID
+ )
+{
+ //
+ // PEI Services Table pointer is cached in the global variable. No additional
+ // migration actions are required.
+ //
+ return;
+}
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