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pc, pc64: fix wrong mtrr physmask() for machines without extended address size msr

--- a/sys/src/9/pc/mtrr.c

+++ b/sys/src/9/pc/mtrr.c

@@ -113,6 +113,8 @@

 	if(regs[0] >= Extaddrsz) {			/* ax */

 		cpuid(Extaddrsz, regs);

 		mask = (1LL << (regs[0] & 0xFF)) - 1;	/* ax */

+	} else {

+		mask &= (1LL << 36) - 1;

 	}

 	return mask;

 }

-- 

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