Implement reboot in sys_reboot

Author: Jiajie Chen

kernel/src/arch/aarch64/cpu.rs

@@ -11,3 +11,7 @@ pub fn id() -> usize {
 pub unsafe fn exit_in_qemu(_error_code: u8) -> ! {
     unimplemented!()
 }
+
+pub unsafe fn reboot() -> ! {
+    unimplemented!()
+}

kernel/src/arch/mipsel/cpu.rs

@@ -31,3 +31,8 @@ pub unsafe fn exit_in_qemu(error_code: u8) -> ! {
     /* nothing to do */
     loop {}
 }
+
+pub unsafe fn reboot() -> ! {
+    /* nothing to do */
+    loop {}
+}

kernel/src/arch/riscv32/cpu.rs

@@ -21,3 +21,7 @@ pub fn halt() {
 pub unsafe fn exit_in_qemu(error_code: u8) -> ! {
     super::sbi::shutdown()
 }
+
+pub unsafe fn reboot() -> ! {
+    super::sbi::shutdown()
+}

kernel/src/arch/x86_64/cpu.rs

@@ -14,6 +14,12 @@ pub unsafe fn exit_in_qemu(error_code: u8) -> ! {
     unreachable!()
 }
 
+pub unsafe fn reboot() -> ! {
+    use x86_64::instructions::port::Port;
+    Port::new(0x64).write(0xfeu8);
+    unreachable!()
+}
+
 pub fn id() -> usize {
     CpuId::new()
         .get_feature_info()

kernel/src/syscall/misc.rs

@@ -122,6 +122,10 @@ impl Syscall<'_> {
             unsafe {
                 cpu::exit_in_qemu(1);
             }
+        } else if cmd == LINUX_REBOOT_CMD_RESTART {
+            unsafe {
+                cpu::reboot();
+            }
         }
         Ok(0)
     }
@@ -188,7 +192,14 @@ impl Syscall<'_> {
     }
 }
 
-const LINUX_REBOOT_CMD_HALT: u32 = 0xcdef0123;
+const LINUX_REBOOT_CMD_RESTART: u32 = 0x01234567;
+const LINUX_REBOOT_CMD_HALT: u32 = 0xCDEF0123;
+const LINUX_REBOOT_CMD_CAD_ON: u32 = 0x89ABCDEF;
+const LINUX_REBOOT_CMD_CAD_OFF: u32 = 0x00000000;
+const LINUX_REBOOT_CMD_POWER_OFF: u32 = 0x4321FEDC;
+const LINUX_REBOOT_CMD_RESTART2: u32 = 0xA1B2C3D4;
+const LINUX_REBOOT_CMD_SW_SUSPEND: u32 = 0xD000FCE2;
+const LINUX_REBOOT_CMD_KEXEC: u32 = 0x45584543;
 
 #[repr(C)]
 #[derive(Debug, Default)]