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There is no IO space on ARM, and there are no special instructions that access it. QEMU emulates the IO space for PCI devices with a special MMIO range. We're ready to use it at this point, we just have to switch the Io(Read|Write)(8|16|32) primitives to their MMIO counterparts, because in "MdePkg/Library/BaseIoLibIntrinsic/IoLibArm.c", the IO primitives correctly ASSERT (FALSE). Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Olivier Martin <Olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16900 6f19259b-4bc3-4df7-8a09-765794883524