diff options
Diffstat (limited to 'src/x86/tsc-x86.s')
| -rw-r--r-- | src/x86/tsc-x86.s | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/x86/tsc-x86.s b/src/x86/tsc-x86.s index 46013bb..09e0e32 100644 --- a/src/x86/tsc-x86.s +++ b/src/x86/tsc-x86.s @@ -29,9 +29,11 @@ sandglass_get_tsc: pushl %ebx /* Callee-save register, clobbered by cpuid */ pushl %esi + xorl %eax, %eax /* Make cpuid do a consistent operation */ cpuid /* Serialize */ rdtsc /* Read time stamp counter */ movl %eax, %esi /* Store tsc */ + xorl %eax, %eax cpuid /* Serialize again */ movl %esi, %eax popl %esi |