SR_SPP
#define CLKF_USERMODE(cf) (((cf)->cf_status & SR_SPP) == 0)
KASSERT(__SHIFTOUT(tf->tf_sr, SR_SPP) == 0);
KASSERT(__SHIFTOUT(tf->tf_sr, SR_SPP) == 0);
const bool usertrap_p = (status & SR_SPP) == 0;
__SHIFTOUT(tf->tf_sr, SR_SPP) != 0);