PSR_PIL
if ((s1 & PSR_PIL) == 0) {
#define CLKF_LOPRI(framep,n) (((framep)->psr & PSR_PIL) < (n) << 8)
oldipl = psr & PSR_PIL;
psr &= ~PSR_PIL; \
oldipl = psr & PSR_PIL;
"r" (psr & ~PSR_PIL), "rn" (newipl));
pil = (getpsr() & PSR_PIL) >> 8;
ih->ih_classipl = (classipl << 8) & PSR_PIL;
ih->ih_classipl = (level << 8) & PSR_PIL;
(getpsr() & PSR_PIL) >> 8);