diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h
index 11fcbf26ca..6bf937743d 100644
--- a/MdePkg/Include/Library/BaseLib.h
+++ b/MdePkg/Include/Library/BaseLib.h
@@ -3517,21 +3517,6 @@ SetInterruptState (
   );
 
 
-/**
-  Places the CPU in a sleep state until an interrupt is received.
-
-  Places the CPU in a sleep state until an interrupt is received. If interrupts
-  are disabled prior to calling this function, then the CPU will be placed in a
-  sleep state indefinitely.
-
-**/
-VOID
-EFIAPI
-CpuSleep (
-  VOID
-  );
-
-
 /**
   Requests CPU to pause for a short period of time.
 
@@ -3546,19 +3531,6 @@ CpuPause (
   );
 
 
-/**
-  Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU.
-
-  Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU.
-
-**/
-VOID
-EFIAPI
-CpuFlushTlb (
-  VOID
-  );
-
-
 /**
   Transfers control to a function starting with a new stack.