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-rw-r--r--src/common/x64/cpu_wait.cpp10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/common/x64/cpu_wait.cpp b/src/common/x64/cpu_wait.cpp
index ea16c8490..41d385f59 100644
--- a/src/common/x64/cpu_wait.cpp
+++ b/src/common/x64/cpu_wait.cpp
@@ -47,6 +47,16 @@ static void TPAUSE() {
const auto edx = static_cast<u32>(tsc >> 32);
asm volatile("tpause %0" : : "r"(RequestC02State), "d"(edx), "a"(eax));
}
+
+static void MWAITX() {
+ static constexpr auto EnableWaitTimeFlag = 1U << 1;
+ static constexpr auto RequestC1State = 0U;
+
+ // monitor_var should be aligned to a cache line.
+ alignas(64) u64 monitor_var{};
+ asm volatile("monitorx" : : "a"(&monitor_var), "c"(0), "d"(0));
+ asm volatile("mwaitx" : : "a"(RequestC1State), "b"(PauseCycles), "c"(EnableWaitTimeFlag));
+}
#endif
void MicroSleep() {