But its constructor uses the global variable mTscFrequency to store frequency, which doesn't work on XIP PEIM.
Split it to two LIBs for PEI and DXE separately.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11312 6f19259b-4bc3-4df7-8a09-765794883524