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We need to use msr instruction to write system register. It seems the code was simply copied from ArmReadCntkCtl. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Heyi Guo <heyi.guo@linaro.org> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17440 6f19259b-4bc3-4df7-8a09-765794883524