Implementing multitasking part.
Implemented system call.
Modified copyright.
Implemented the interface for system call.
Merge branch 'new/syscall'
Modified copyright header.
Modified copyright header.
Added system.c to implement system functions.
Implementing semaphore.
Implementing UI.
Implementing UI.
Implemented a prototype of the keyboard driver.
e1000: Implementing interrupt support.
e1000: Implementing interrupt support.
Modified to mitigate warnings.
Implementing management process.
Debugging e1000e driver and routing functionality.
Conducting some experiments.
Improving TX and routing process. Need refactoring to ixgbe.c.
Testing full route lookup in IPv4 routing.