SSTATUS_FS_MASK
frame->tf_sstatus &= ~SSTATUS_FS_MASK;
~(SSTATUS_SD | SSTATUS_XS_MASK | SSTATUS_FS_MASK | SSTATUS_UPIE |
td->td_frame->tf_sstatus &= ~SSTATUS_FS_MASK;
mask = SSTATUS_FS_MASK;
frame->tf_sstatus &= ~SSTATUS_FS_MASK;