匿名管道重构&增加IrqArch trait以及IrqFlags及其守卫 (#253)

* 实现匿名管道

* 增加IrqArch trait以及IrqFlags及其守卫

---------

Co-authored-by: longjin <longjin@RinGoTek.cn>

kernel/src/arch/x86_64/interrupt/mod.rs

@@ -1,5 +1,12 @@
 #![allow(dead_code)]
-use core::arch::asm;
+use core::{
+    arch::asm,
+    sync::atomic::{compiler_fence, Ordering},
+};
+
+use crate::exception::{InterruptArch, IrqFlags, IrqFlagsGuard};
+
+use super::asm::irqflags::{local_irq_restore, local_irq_save};
 
 /// @brief 关闭中断
 #[inline]
@@ -16,3 +23,39 @@ pub fn sti() {
         asm!("sti");
     }
 }
+
+pub struct X86_64InterruptArch;
+
+impl InterruptArch for X86_64InterruptArch {
+    unsafe fn interrupt_enable() {
+        sti();
+    }
+
+    unsafe fn interrupt_disable() {
+        cli();
+    }
+
+    fn is_irq_enabled() -> bool {
+        let rflags: u64;
+        unsafe {
+            asm!("pushfq; pop {}", out(reg) rflags);
+        }
+        return rflags & (1 << 9) != 0;
+    }
+
+    unsafe fn save_and_disable_irq() -> IrqFlagsGuard {
+        compiler_fence(Ordering::SeqCst);
+        let mut rflags: u64 = 0;
+        local_irq_save(&mut rflags);
+        let flags = IrqFlags::new(rflags);
+        let guard = IrqFlagsGuard::new(flags);
+        compiler_fence(Ordering::SeqCst);
+        return guard;
+    }
+
+    unsafe fn restore_irq(flags: IrqFlags) {
+        compiler_fence(Ordering::SeqCst);
+        local_irq_restore(&flags.flags());
+        compiler_fence(Ordering::SeqCst);
+    }
+}