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

2020-05-24 17:50:37 +02:00 · 2020-05-24 17:50:37 +02:00 · 153fcabb00
parent 9960a125a3
commit 153fcabb00
1 changed files with 2 additions and 0 deletions
--- a/sys/src/9/pc/mtrr.c
+++ b/sys/src/9/pc/mtrr.c
@ -113,6 +113,8 @@ physmask(void)
 	if(regs[0] >= Extaddrsz) {			/* ax */
 		cpuid(Extaddrsz, regs);
 		mask = (1LL << (regs[0] & 0xFF)) - 1;	/* ax */
+	} else {
+		mask &= (1LL << 36) - 1;
 	}
 	return mask;
 }