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| author |   tholo <tholo@openbsd.org> | 1996-05-06 20:29:38 +0000 |
|---|---|---|
| committer | tholo <tholo@openbsd.org> | 1996-05-06 20:29:38 +0000 |
| commit | 6e04bc6b518516bfbb9fdcfe4aa19f8deaf3a176 (patch) | |
| tree | 5fcdd629ce6a6620f0b191292e50c77f85f8226a | |
| parent | use mounted table instead of fstab for -a; netbsd pr#2363; from greywolf@defender.VAS.viewlogic.com (diff) | |
| download | wireguard-openbsd-6e04bc6b518516bfbb9fdcfe4aa19f8deaf3a176.tar.xz wireguard-openbsd-6e04bc6b518516bfbb9fdcfe4aa19f8deaf3a176.zip | |
Zero the instruction counter on Pentium's after detecting one if we have
NTP code compiled in; prevents division errors in microtime()
| -rw-r--r-- | sys/arch/i386/i386/locore.s | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/arch/i386/i386/locore.s b/sys/arch/i386/i386/locore.s index 9d6eb1775d3..bd1ca34badf 100644 --- a/sys/arch/i386/i386/locore.s +++ b/sys/arch/i386/i386/locore.s @@ -437,6 +437,13 @@ try586: /* Use the `cpuid' instruction. */ jb is486 # less than a Pentium movl $CPU_586,RELOC(_cpu) +#ifdef NTP + xorl %eax,%eax + xorl %edx,%edx + movl $10,%ecx + .byte 0xf, 0x30 # wrmsr (or trap on non-pentium :-) +#endif + 2: /* * Finished with old stack; load new %esp now instead of later so we |