SUN4U_TLB_EXEC_ONLY
tte.data |= SUN4U_TLB_EXEC_ONLY;
tte.data |= SUN4U_TLB_EXEC_ONLY;
data &= ~(SUN4U_TLB_EXEC | SUN4U_TLB_EXEC_ONLY);
set |= SUN4U_TLB_EXEC_ONLY;
clear |= SUN4U_TLB_EXEC_ONLY;