1 files changed, 38 insertions, 1 deletions
diff --git a/MdePkg/Library/BaseLib/Ebc/SetJumpLongJump.c b/MdePkg/Library/BaseLib/Ebc/SetJumpLongJump.c
index ab7716cb94..b485d3e495 100644
--- a/MdePkg/Library/BaseLib/Ebc/SetJumpLongJump.c
+++ b/MdePkg/Library/BaseLib/Ebc/SetJumpLongJump.c
@@ -14,12 +14,35 @@
 
 **/
 
+/**
+  Worker function that checks ASSERT condition for JumpBuffer
+
+  Checks ASSERT condition for JumpBuffer.
+
+  If JumpBuffer is NULL, then ASSERT().
+  For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
+
+  @param  JumpBuffer    A pointer to CPU context buffer.
+
+**/
 VOID
-EFIAPI
 InternalAssertJumpBuffer (
   IN      BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer
   );
 
+/**
+  Saves the current CPU context that can be restored with a call to LongJump() and returns 0.
+
+  Saves the current CPU context in the buffer specified by JumpBuffer and returns 0.  The initial 
+  call to SetJump() must always return 0.  Subsequent calls to LongJump() cause a non-zero 
+  value to be returned by SetJump(). 
+
+  If JumpBuffer is NULL, then ASSERT().
+  For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
+
+  @param  JumpBuffer    A pointer to CPU context buffer.
+ 
+**/
 UINTN
 EFIAPI
 SetJump (
@@ -30,6 +53,17 @@ SetJump (
   return 0;
 }
 
+/**
+  Restores the CPU context that was saved with SetJump().
+
+  Restores the CPU context from the buffer specified by JumpBuffer.
+  This function never returns to the caller.
+  Instead is resumes execution based on the state of JumpBuffer.
+
+  @param  JumpBuffer    A pointer to CPU context buffer.
+  @param  Value         The value to return when the SetJump() context is restored.
+
+**/
 VOID
 EFIAPI
 InternalLongJump (
@@ -37,5 +71,8 @@ InternalLongJump (
   IN      UINTN                     Value
   )
 {
+  //
+  // This function cannot work on EBC
+  //
   ASSERT (FALSE);
 }