i8259: Convert to MemoryRegion
The only non-obvious part is pic_poll_read which used "addr1 >> 7" to detect whether one referred to either the master or slave PIC. Instead, test this directly. Signed-off-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAvi Kivity <avi@redhat.com>
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