LONG_BIT
#define PLEN (LONG_BIT / 4 + 2)
chanid = (row * LONG_BIT) + bit;
#define VMBUS_EVTFLAGS_MAX ((VMBUS_EVTFLAGS_SIZE / LONG_BIT) * 8)
#define VMBUS_EVTFLAG_LEN LONG_BIT
#define VMBUS_EVTFLAG_MASK (LONG_BIT - 1)
port = (row * LONG_BIT) + bit;
#define PLEN (LONG_BIT / 4 + 2)