Greetings, OpenBSD/macppc does not complete early boot on mac99: OpenPIC can reassert an interrupt still masked by CTPR; the edge triggered decrementer does not raise on zero; successful CUDA ADB replies omit the original command; and the fixed CUDA shift register delay can stretch packet delivery past the guest timeout on hosts with coarse timers.
This series corrects these four behaviours and adds a functional test which boots the official OpenBSD 7.9 macppc CD to the installer prompt. P.S. this is second attempt to send the same patch because first one had wrong subject and missed qemu-ppc@
