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to zero page, and it branches to either the rx or tx handler. My intention is that the tx handler should switch to the rx one the moment it finishes, without needing a downgrade, which I hope will get rid of the start-of-frame rx overruns I'm seeing. While I'm here, move the constants describing the shape of the FIQ state structures out of if_ecavar.h and into genassym.cf where they belong.