1 use core::ops::Add;
2 
3 use system_error::SystemError;
4 
5 use crate::arch::CurrentIrqArch;
6 
7 pub mod dummychip;
8 pub mod handle;
9 pub mod init;
10 pub mod ipi;
11 pub mod irqchip;
12 pub mod irqdata;
13 pub mod irqdesc;
14 pub mod irqdomain;
15 pub mod manage;
16 pub mod msi;
17 mod resend;
18 pub mod softirq;
19 pub mod sysfs;
20 
21 /// 中断的架构相关的trait
22 pub trait InterruptArch: Send + Sync {
23     /// 架构相关的中断初始化
arch_irq_init() -> Result<(), SystemError>24     unsafe fn arch_irq_init() -> Result<(), SystemError>;
25     /// 使能中断
interrupt_enable()26     unsafe fn interrupt_enable();
27     /// 禁止中断
interrupt_disable()28     unsafe fn interrupt_disable();
29     /// 检查中断是否被禁止
is_irq_enabled() -> bool30     fn is_irq_enabled() -> bool;
31 
32     /// 保存当前中断状态,并且禁止中断
save_and_disable_irq() -> IrqFlagsGuard33     unsafe fn save_and_disable_irq() -> IrqFlagsGuard;
restore_irq(flags: IrqFlags)34     unsafe fn restore_irq(flags: IrqFlags);
35 
36     /// 检测系统支持的中断总数
probe_total_irq_num() -> u3237     fn probe_total_irq_num() -> u32;
38 
arch_early_irq_init() -> Result<(), SystemError>39     fn arch_early_irq_init() -> Result<(), SystemError> {
40         Ok(())
41     }
42 
43     /// 响应未注册的中断
ack_bad_irq(irq: IrqNumber)44     fn ack_bad_irq(irq: IrqNumber);
45 }
46 
47 #[derive(Debug, Clone, Copy)]
48 pub struct IrqFlags {
49     flags: usize,
50 }
51 
52 impl IrqFlags {
new(flags: usize) -> Self53     pub fn new(flags: usize) -> Self {
54         IrqFlags { flags }
55     }
56 
flags(&self) -> usize57     pub fn flags(&self) -> usize {
58         self.flags
59     }
60 }
61 
62 /// @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
63 ///
64 /// # Example
65 ///
66 /// ```
67 /// use crate::arch::CurrentIrqArch;
68 ///
69 /// // disable irq and save irq state (这是唯一的获取IrqFlagsGuard的方法)
70 /// let guard = unsafe{CurrentIrqArch::save_and_disable_irq()};
71 ///
72 /// // do something
73 ///
74 /// // 销毁guard时,会恢复之前的中断状态
75 /// drop(guard);
76 ///
77 /// ```
78 #[derive(Debug)]
79 pub struct IrqFlagsGuard {
80     flags: IrqFlags,
81 }
82 
83 impl IrqFlagsGuard {
84     /// @brief 创建IrqFlagsGuard对象
85     ///
86     /// # Safety
87     ///
88     /// 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
89     ///
90     /// 该函数只应被`CurrentIrqArch::save_and_disable_irq`调用
new(flags: IrqFlags) -> Self91     pub unsafe fn new(flags: IrqFlags) -> Self {
92         IrqFlagsGuard { flags }
93     }
94 }
95 impl Drop for IrqFlagsGuard {
drop(&mut self)96     fn drop(&mut self) {
97         unsafe {
98             CurrentIrqArch::restore_irq(self.flags);
99         }
100     }
101 }
102 
103 // 定义中断号结构体
104 // 用于表示软件逻辑视角的中断号,全局唯一
105 int_like!(IrqNumber, u32);
106 
107 impl IrqNumber {
108     /// 如果一个(PCI)设备中断没有被连接,我们将设置irqnumber为IRQ_NOTCONNECTED。
109     /// 这导致request_irq()失败,返回-ENOTCONN,这样我们就可以区分这种情况和其他错误返回。
110     pub const IRQ_NOTCONNECTED: IrqNumber = IrqNumber::new(u32::MAX);
111 }
112 
113 // 硬件中断号
114 // 用于表示在某个IrqDomain中的中断号
115 int_like!(HardwareIrqNumber, u32);
116 
117 impl Add<u32> for HardwareIrqNumber {
118     type Output = HardwareIrqNumber;
119 
add(self, rhs: u32) -> HardwareIrqNumber120     fn add(self, rhs: u32) -> HardwareIrqNumber {
121         HardwareIrqNumber::new(self.0 + rhs)
122     }
123 }
124 
125 impl Add<u32> for IrqNumber {
126     type Output = IrqNumber;
127 
add(self, rhs: u32) -> IrqNumber128     fn add(self, rhs: u32) -> IrqNumber {
129         IrqNumber::new(self.0 + rhs)
130     }
131 }
132