Hardware Interrupts

Cargo.lock

@@ -8,6 +8,8 @@ version = "0.1.0"
 dependencies = [
  "bootloader",
  "lazy_static",
+ "pc-keyboard",
+ "pic8259",
  "spin",
  "uart_16550",
  "volatile 0.2.7",
@@ -41,6 +43,21 @@ dependencies = [
  "spin",
 ]
 
+[[package]]
+name = "pc-keyboard"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c6f2d937e3b8d63449b01401e2bae4041bc9dd1129c2e3e0d239407cf6635ac"
+
+[[package]]
+name = "pic8259"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24ec21f514e2e16e94649f1d041ca4a7069b512c037ac156360652a775e6229d"
+dependencies = [
+ "x86_64",
+]
+
 [[package]]
 name = "spin"
 version = "0.5.2"

Cargo.toml

@@ -18,6 +18,8 @@ volatile = "0.2.6"
 spin = "0.5.2"
 x86_64 = "0.14.7"
 uart_16550 = "0.2.0"
+pic8259 = "0.10.1"
+pc-keyboard = "0.5.0"
 
 [dependencies.lazy_static]
 version = "1.0"

src/interrupts.rs

@@ -1,7 +1,9 @@
 use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame};
-use crate::println;
+use crate::{println, print};
 use lazy_static::lazy_static;
 use crate::gdt;
+use pic8259::ChainedPics;
+use spin;
 
 lazy_static! {
     static ref IDT: InterruptDescriptorTable = {
@@ -11,6 +13,10 @@ lazy_static! {
             idt.double_fault.set_handler_fn(double_fault_handler)
                 .set_stack_index(gdt::DOUBLE_FAULT_IST_INDEX);
         }
+        idt[InterruptIndex::Timer.as_usize()]
+            .set_handler_fn(timer_interrupt_handler);
+        idt[InterruptIndex::Keyboard.as_usize()]
+            .set_handler_fn(keyboard_interrupt_handler);
         idt
     };
 }
@@ -26,3 +32,60 @@ extern "x86-interrupt" fn breakpoint_handler(stack_frame: InterruptStackFrame) {
 extern "x86-interrupt" fn double_fault_handler(stack_frame: InterruptStackFrame, _error_code: u64) -> ! {
     panic!("EXCEPTION: DOUBLE FAULT\n{:#?}", stack_frame);
 }
+
+pub const PIC_1_OFFSET: u8 = 32;
+pub const PIC_2_OFFSET: u8 = PIC_1_OFFSET + 8;
+pub static PICS: spin::Mutex<ChainedPics> =
+    spin::Mutex::new(unsafe { ChainedPics::new(PIC_1_OFFSET, PIC_2_OFFSET) });
+
+#[derive(Debug, Clone, Copy)]
+#[repr(u8)]
+pub enum InterruptIndex {
+    Timer = PIC_1_OFFSET,
+    Keyboard,
+}
+
+impl InterruptIndex {
+    fn as_u8(self) -> u8 {
+        self as u8
+    }
+    fn as_usize(self) -> usize {
+        usize::from(self.as_u8())
+    }
+}
+
+extern "x86-interrupt" fn timer_interrupt_handler(_stack_frame: InterruptStackFrame) {
+    print!(".");
+    unsafe {
+        PICS.lock()
+            .notify_end_of_interrupt(InterruptIndex::Timer.as_u8());
+    }
+}
+
+extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: InterruptStackFrame) {
+    use pc_keyboard::{layouts, DecodedKey, HandleControl, Keyboard, ScancodeSet1};
+    use spin::Mutex;
+    use x86_64::instructions::port::Port;
+
+    lazy_static! {
+        static ref KEYBOARD: Mutex<Keyboard<layouts::Us104Key, ScancodeSet1>> =
+            Mutex::new(Keyboard::new(layouts::Us104Key, ScancodeSet1, HandleControl::Ignore));
+    }
+
+    let mut keyboard = KEYBOARD.lock();
+    let mut port = Port::new(0x60);
+    let scancode: u8 = unsafe { port.read() };
+    if let Ok(Some(key_event)) = keyboard.add_byte(scancode) {
+        if let Some(key) = keyboard.process_keyevent(key_event) {
+            match key {
+                DecodedKey::Unicode(character) => print!("{}", character),
+                DecodedKey::RawKey(key) => print!("{:?}", key),
+            }
+        }
+    }
+
+    unsafe {
+        PICS.lock()
+            .notify_end_of_interrupt(InterruptIndex::Keyboard.as_u8());
+    }
+}

src/lib.rs

@@ -38,7 +38,7 @@ pub fn test_panic_handler(info: &PanicInfo) -> ! {
     serial_println!("[failed]\n");
     serial_println!("Error: {}\n", info);
     exit_qemu(QemuExitCode::Failed);
-    loop {}
+    hlt_loop();
 }
 
 #[cfg(test)]
@@ -46,7 +46,7 @@ pub fn test_panic_handler(info: &PanicInfo) -> ! {
 pub extern "C" fn _start() -> ! {
     init();
     test_main();
-    loop {}
+    hlt_loop();
 }
 
 #[cfg(test)]
@@ -79,7 +79,15 @@ pub fn exit_qemu(exit_code: QemuExitCode) {
     }
 }
 
+pub fn hlt_loop() -> ! {
+    loop {
+        x86_64::instructions::hlt();
+    }
+}
+
 pub fn init() {
     gdt::init();
     interrupts::init_idt();
+    unsafe { interrupts::PICS.lock().initialize() };
+    x86_64::instructions::interrupts::enable();
 }

src/main.rs

@@ -20,17 +20,10 @@ pub extern "C" fn _start() -> ! {
     x86_64::instructions::interrupts::int3();
     println!("It didn't crash!");
 
-    // 触发一个页错误
-    // 由于我们没有设定页错误的处理函数
-    // 所以会触发 double fault
-    unsafe {
-        *(0xdeadbeef as *mut u64) = 42; // 强制写入某个内存地址
-    }
-
     #[cfg(test)]
     test_main();
 
-    loop {}
+    anos::hlt_loop();
 }
 
 // 在非测试模式下，将 panic 信息打印到 VGA 缓冲区
@@ -40,7 +33,7 @@ pub extern "C" fn _start() -> ! {
 // 禁用标准库之后，这些东西就都没有了，我们需要把它重写一遍
 fn panic(info: &PanicInfo) -> ! {
     println!("{}", info);
-    loop {}
+    anos::hlt_loop();
 }
 
 #[cfg(test)]

src/serial.rs

@@ -13,7 +13,14 @@ lazy_static! {
 #[doc(hidden)]
 pub fn _print(args: ::core::fmt::Arguments) {
     use core::fmt::Write;
-    SERIAL1.lock().write_fmt(args).expect("Printing to serial failed");
+    use x86_64::instructions::interrupts;
+
+    interrupts::without_interrupts(|| {
+        SERIAL1
+            .lock()
+            .write_fmt(args)
+            .expect("Printing to serial failed");
+    });
 }
 
 #[macro_export]

src/vga_buffer.rs

@@ -153,7 +153,11 @@ macro_rules! println {  // println!()
 #[doc(hidden)]
 pub fn _print(args: fmt::Arguments) {
     use core::fmt::Write;
+    use x86_64::instructions::interrupts;
+
+    interrupts::without_interrupts(|| {
         WRITER.lock().write_fmt(args).unwrap();
+    });
 }
 
 #[test_case]
@@ -170,10 +174,16 @@ fn test_println_many() {    // 测试多行 println!
 
 #[test_case]
 fn test_println_output() {  // 测试字符是否真的打印到了屏幕上
+    use core::fmt::Write;
+    use x86_64::instructions::interrupts;
+
     let s = "Some test string that fits on a single line";
-    println!("{}", s);
+    interrupts::without_interrupts(|| {
+        let mut writer = WRITER.lock();
+        writeln!(writer, "\n{}", s).expect("writeln failed");
         for (i, c) in s.chars().enumerate() {
-        let screen_char = WRITER.lock().buffer.chars[BUFFER_HEIGHT - 2][i].read();
+            let screen_char = writer.buffer.chars[BUFFER_HEIGHT - 2][i].read();
             assert_eq!(char::from(screen_char.ascii_character), c);
         }
+    });
 }