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//! Functions to read time stamp counters on x86.
use crate::arch::{__rdtscp, _rdtsc};
/// Read the time stamp counter.
///
/// The RDTSC instruction is not a serializing instruction.
/// It does not necessarily wait until all previous instructions
/// have been executed before reading the counter. Similarly,
/// subsequent instructions may begin execution before the
/// read operation is performed. If software requires RDTSC to be
/// executed only after all previous instructions have completed locally,
/// it can either use RDTSCP or execute the sequence LFENCE;RDTSC.
///
/// # Safety
/// * Causes a GP fault if the TSD flag in register CR4 is set and the CPL
/// is greater than 0.
pub unsafe fn rdtsc() -> u64 {
_rdtsc() as u64
}
/// Read the time stamp counter.
///
/// The RDTSCP instruction waits until all previous instructions
/// have been executed before reading the counter.
/// However, subsequent instructions may begin execution
/// before the read operation is performed.
///
/// Volatile is used here because the function may be used to act as
/// an instruction barrier.
///
/// # Safety
/// * Causes a GP fault if the TSD flag in register CR4 is set and the
/// CPL is greater than 0.
pub unsafe fn rdtscp() -> u64 {
let mut _aux = 0;
__rdtscp(&mut _aux)
}
#[cfg(all(test, feature = "utest"))]
mod test {
use super::*;
#[test]
fn check_rdtsc() {
let cpuid = crate::cpuid::CpuId::new();
let has_tsc = cpuid
.get_feature_info()
.map_or(false, |finfo| finfo.has_tsc());
if has_tsc {
unsafe {
assert!(rdtsc() > 0, "rdtsc returned 0, unlikely!");
}
}
}
#[test]
fn check_rdtscp() {
let cpuid = crate::cpuid::CpuId::new();
let has_tsc = cpuid
.get_feature_info()
.map_or(false, |finfo| finfo.has_tsc());
if has_tsc {
unsafe {
assert!(rdtscp() > 0, "rdtscp returned 0, unlikely!");
}
}
}
}
|
