diff options
Diffstat (limited to 'lib/libc/arch/amd64/gen/usertc.c')
| -rw-r--r-- | lib/libc/arch/amd64/gen/usertc.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/libc/arch/amd64/gen/usertc.c b/lib/libc/arch/amd64/gen/usertc.c index 7529af598da..6c37a8c5cc1 100644 --- a/lib/libc/arch/amd64/gen/usertc.c +++ b/lib/libc/arch/amd64/gen/usertc.c @@ -1,4 +1,4 @@ -/* $OpenBSD: usertc.c,v 1.2 2020/07/08 09:17:48 kettenis Exp $ */ +/* $OpenBSD: usertc.c,v 1.3 2020/08/23 21:38:47 cheloha Exp $ */ /* * Copyright (c) 2020 Paul Irofti <paul@irofti.net> * @@ -19,10 +19,10 @@ #include <sys/timetc.h> static inline u_int -rdtsc(void) +rdtsc_lfence(void) { uint32_t hi, lo; - asm volatile("rdtsc" : "=a"(lo), "=d"(hi)); + asm volatile("lfence; rdtsc" : "=a"(lo), "=d"(hi)); return ((uint64_t)lo)|(((uint64_t)hi)<<32); } @@ -31,7 +31,7 @@ tc_get_timecount(struct timekeep *tk, u_int *tc) { switch (tk->tk_user) { case TC_TSC: - *tc = rdtsc(); + *tc = rdtsc_lfence(); return 0; } |