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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4395 FSP specification defines the TempRamInit API preserved register list which including EBX/RBX, however current implementation unexpectedly overriding EBX/RBX register that should be fixed. Cc: Nate DeSimone <nathaniel.l.desimone@intel.com> Cc: Star Zeng <star.zeng@intel.com> Signed-off-by: Chasel Chiu <chasel.chiu@intel.com> Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>