PSTATE_PEF
sparc_wrpr(pstate, pstate | PSTATE_PEF, 0);
#define TSTATE_PEF (PSTATE_PEF<<TSTATE_PSTATE_SHIFT)
tf->tf_tstate |= (PSTATE_PEF<<TSTATE_PSTATE_SHIFT);
tf->tf_tstate |= (PSTATE_PEF<<TSTATE_PSTATE_SHIFT);
~((PSTATE_PEF << TSTATE_PSTATE_SHIFT) | TSTATE_CCR);