1e69186a23d08399ed6245c74fb501e1bc49aaf3
Soon we're going to specify Extended Addresses of register blocks in Generic Address Structure format. The GAS is easy to fill if we want to posit either "unsupported" (all zero) or a given address in a specific address space. However deriving "unsupported" just from a macro expanding to zero is unwieldy, so let's avoid the need. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14153 6f19259b-4bc3-4df7-8a09-765794883524
Otherwise gcc can default to the "sysv_abi" (as opposed to the "ms_abi") calling convention on X64, causing problems like <http://sourceforge.net/mailarchive/message.php?msg_id=30356166>.
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