License rust and c source files

services/comps/time/src/clocksource.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MPL-2.0
+
 //! This module provides abstractions for hardware-assisted timing mechanisms, encapsulated by the `ClockSource` struct.
 //! A `ClockSource` can be constructed from any counter with a stable frequency, enabling precise time measurements to be taken
 //! by retrieving instances of `Instant`.

services/comps/time/src/lib.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MPL-2.0
+
 //! The system time of Asterinas.
 #![no_std]
 #![forbid(unsafe_code)]

services/comps/time/src/rtc.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MPL-2.0
+
 use aster_frame::arch::x86::device::cmos::{get_century_register, CMOS_ADDRESS, CMOS_DATA};
 use core::sync::atomic::AtomicU8;
 use core::sync::atomic::Ordering::Relaxed;

services/comps/time/src/tsc.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MPL-2.0
+
 //! This module provide a instance of `ClockSource` based on TSC.
 //!
 //! Use `init` to initialize this module.