MVS_INT_STAT
mw32_f(MVS_INT_STAT, CINT_DONE);
mw32(MVS_INT_STAT, CINT_CI_STOP);
mw32_f(MVS_INT_STAT, CINT_DONE);
tmp = mr32(MVS_INT_STAT);
mw32(MVS_INT_STAT, tmp | CINT_CI_STOP);
stat = mr32(MVS_INT_STAT);
mw32(MVS_INT_STAT, stat);