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17 lines
603 B
Diff
17 lines
603 B
Diff
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diff --git a/src/arch/i386/include/ipxe/rdtsc_timer.h b/src/arch/i386/include/ipxe/rdtsc_timer.h
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index 472e140..d5095a7 100644
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--- a/src/arch/i386/include/ipxe/rdtsc_timer.h
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+++ b/src/arch/i386/include/ipxe/rdtsc_timer.h
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@@ -30,7 +30,10 @@ static inline __always_inline unsigned long
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TIMER_INLINE ( rdtsc, currticks ) ( void ) {
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unsigned long ticks;
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- __asm__ __volatile__ ( "rdtsc\n\t"
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+ __asm__ __volatile__ (
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+ "mfence\n\t"
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+ "rdtsc\n\t"
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+ "mfence\n\t"
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"shrdl %1, %%edx, %%eax\n\t"
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: "=a" ( ticks ) : "i" ( TSC_SHIFT ) : "edx" );
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return ticks;
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