1 use crate::arch::CurrentIrqArch; 2 3 pub mod ipi; 4 pub mod softirq; 5 6 /// @brief 中断相关的操作 7 pub trait InterruptArch: Send + Sync { 8 /// @brief 使能中断 9 unsafe fn interrupt_enable(); 10 /// @brief 禁止中断 11 unsafe fn interrupt_disable(); 12 /// @brief 检查中断是否被禁止 13 fn is_irq_enabled() -> bool; 14 15 /// @brief 保存当前中断状态，并且禁止中断 16 unsafe fn save_and_disable_irq() -> IrqFlagsGuard; 17 unsafe fn restore_irq(flags: IrqFlags); 18 } 19 20 #[derive(Debug, Clone, Copy)] 21 pub struct IrqFlags { 22 flags: usize, 23 } 24 25 impl IrqFlags { 26 pub fn new(flags: usize) -> Self { 27 IrqFlags { flags } 28 } 29 30 pub fn flags(&self) -> usize { 31 self.flags 32 } 33 } 34 35 /// @brief 当前中断状态的保护器，当该对象被drop时，会恢复之前的中断状态 36 /// 37 /// # Example 38 /// 39 /// ``` 40 /// use crate::arch::CurrentIrqArch; 41 /// 42 /// // disable irq and save irq state （这是唯一的获取IrqFlagsGuard的方法） 43 /// let guard = unsafe{CurrentIrqArch::save_and_disable_irq()}; 44 /// 45 /// // do something 46 /// 47 /// // 销毁guard时，会恢复之前的中断状态 48 /// drop(guard); 49 /// 50 /// ``` 51 #[derive(Debug)] 52 pub struct IrqFlagsGuard { 53 flags: IrqFlags, 54 } 55 56 impl IrqFlagsGuard { 57 /// @brief 创建IrqFlagsGuard对象 58 /// 59 /// # Safety 60 /// 61 /// 该函数不安全，因为它不会检查flags是否是一个有效的IrqFlags对象, 而当它被drop时，会恢复flags中的中断状态 62 /// 63 /// 该函数只应被`CurrentIrqArch::save_and_disable_irq`调用 64 pub unsafe fn new(flags: IrqFlags) -> Self { 65 IrqFlagsGuard { flags } 66 } 67 } 68 impl Drop for IrqFlagsGuard { 69 fn drop(&mut self) { 70 unsafe { 71 CurrentIrqArch::restore_irq(self.flags); 72 } 73 } 74 } 75