36 lines
1.1 KiB
Rust
36 lines
1.1 KiB
Rust
//! 这个文件实现的是调度过程中涉及到的时钟
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//!
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use crate::{arch::CurrentTimeArch, smp::cpu::ProcessorId, time::TimeArch};
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pub struct SchedClock;
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impl SchedClock {
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#[inline]
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pub fn sched_clock_cpu(_cpu: ProcessorId) -> u64 {
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#[cfg(target_arch = "x86_64")]
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{
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if crate::arch::driver::tsc::TSCManager::cpu_khz() == 0 {
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// TSC not calibrated yet
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return 0;
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}
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return CurrentTimeArch::cycles2ns(CurrentTimeArch::get_cycles()) as u64;
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}
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#[cfg(any(target_arch = "riscv64", target_arch = "loongarch64"))]
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{
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return CurrentTimeArch::cycles2ns(CurrentTimeArch::get_cycles()) as u64;
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}
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}
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}
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bitflags! {
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pub struct ClockUpdataFlag: u8 {
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/// 请求在下一次调用 __schedule() 时跳过时钟更新
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const RQCF_REQ_SKIP = 0x01;
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/// 表示跳过时钟更新正在生效，update_rq_clock() 的调用将被忽略。
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const RQCF_ACT_SKIP = 0x02;
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/// 调试标志，指示自上次固定 rq::lock 以来是否已调用过
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const RQCF_UPDATE = 0x04;
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}
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}
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