MB_IN32
return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
(void)MB_IN32(bay, KEYLARGO_MBCR);
(void)MB_IN32(bay, KEYLARGO_MBCR);
return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
#define MB_BIS(bay,r,v) (MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
#define MB_BIC(bay,r,v) (MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))