A simple xv6-style kernel.

There are two userspace programs sh and greet. The sh program simply runs an infinite loop waiting for a prompt. The valid prompts currently are about, echo, shutdown and the name of the command greet. The first three are shell commands (i.e no process is spawned), while greet is a seperate executable program which does nothing but print a greeting message.

Repo Organisation

allocator - Contains the physical allocator used to allocate physical pages. This is not used for the kernel heap allocator. The kernel heap is a statically allocated buffer.

hal - Contains the interfaces (traits) necessary for architecture-specific code to implement.

arch - Contains architecture-specific implementations of the traits in the hal crate.

kernel - The crate houses the code for interrupt handling, sycall handling, context switching, and scheduling.

sync - Contains architecture-independent code for Mutex (xv6-style spinlocks), RwLock.

userspace - Contains sample userspace programs.

janglib - This crate is included by both the kernel and userspace programs. For the userspace programs, this crate provides the necessary syscall wrappers and library calls to do common tasks like printing to stdout, reading from stdin, allocating memory etc.

Running

• Install qemu and the Rust Risc-V toolchain.
• Run make in the root directory of this project.
• Switch to serial0