diff options
| author | Thorsten Lockert <tholo@cvs.openbsd.org> | 1996-05-06 20:29:39 +0000 |
|---|---|---|
| committer | Thorsten Lockert <tholo@cvs.openbsd.org> | 1996-05-06 20:29:39 +0000 |
| commit | 717dedd6c08d933f409f66fc8a4544536b281c66 (patch) | |
| tree | cd8ac267c8953095a2b9c21ece09319f01fd213f /sys/arch/i386 | |
| parent | 7472e7abc37d1d43120ae025f36f6803252efa88 (diff) | |
Zero the instruction counter on Pentium's after detecting one if we have
NTP code compiled in; prevents division errors in microtime()
Diffstat (limited to 'sys/arch/i386')
| -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 |