avoid bios sign msr on intel family < 6

the pentium msr list in the sdm does not include it

diff --git a/sys/arch/i386/i386/machdep.c b/sys/arch/i386/i386/machdep.c
index 7bbefdf..9ce0882 100644 (file)
--- a/sys/arch/i386/i386/machdep.c
+++ b/sys/arch/i386/i386/machdep.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: machdep.c,v 1.667 2023/08/16 07:26:05 jsg Exp $       */
+/*     $OpenBSD: machdep.c,v 1.668 2023/08/16 09:51:39 jsg Exp $       */
 /*     $NetBSD: machdep.c,v 1.214 1996/11/10 03:16:17 thorpej Exp $    */
 
 /*-
@@ -1866,7 +1866,8 @@ identifycpu(struct cpu_info *ci)
                if (strcmp(cpu_vendor, "AuthenticAMD") == 0 &&
                    ci->ci_family >= 0x0f) {
                        level = rdmsr(MSR_PATCH_LEVEL);
-               } else if (strcmp(cpu_vendor, "GenuineIntel") == 0) {
+               } else if (strcmp(cpu_vendor, "GenuineIntel") == 0 &&
+                   ci->ci_family >= 6) {
                        wrmsr(MSR_BIOS_SIGN, 0);
                        CPUID(1, dummy, dummy, dummy, dummy);
                        level = rdmsr(MSR_BIOS_SIGN) >> 32;