diff options
| -rw-r--r-- | src/common/x64/cpu_wait.cpp | 10 |
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() { |