@return The value of the asked parameter or 0 in case of error.\r
**/\r
UINT64\r
+EFIAPI\r
XenHypercallHvmGetParam (\r
UINT32 Index\r
);\r
otherwise, an error code.\r
**/\r
INTN\r
+EFIAPI\r
XenHypercallMemoryOp (\r
IN UINTN Operation,\r
IN OUT VOID *Arguments\r
otherwise, an error code.\r
**/\r
INTN\r
+EFIAPI\r
XenHypercallEventChannelOp (\r
IN INTN Operation,\r
IN OUT VOID *Arguments\r