Udpate README.md to reflect the new name Occlum

README.md

@@ -1,45 +1,62 @@
-# Rusgx
+# Occlum
 
-Rusgx is a single-address-space library OS for Intel SGX. It is written in Rust programming language for memory safety. This project is still work-in-progress.
+Occlum is a memory-safe, multi-process library OS for Intel SGX. As a library OS, it enables *unmodified* applications to run on SGX, thus protecting the confidentiality and integrity of user workloads transparently. 
 
-## How to build
+Compared to existing library OSes for SGX, Occlum has following unprecedented features:
+
+  * **Memory safety.** The library OS itself is written in Rust, a memory-safe programming language, thus free from low-level, memory bugs;
+  * **Efficient multitasking.** The library OS has a complete and efficient multi-process support, including fast process creation, low-cost IPC, code sharing (e.g., shared libraries) and data sharing (e.g., encrypted file systems).
+  * **Fault isolation** - The crash of one user process cannot crash the library OS or other user processes, which is good for system stability and data integrity.
+
+## How to Build?
 
 ### Prerequisite
 
-Rusgx depends on [Rust SGX SDK](https://github.com/baidu/rust-sgx-sdk/). So, make sure Rust SGX SDk can be built properly. We have tested with Rust SGX SDK 1.1, Rust nightly-2018-08-25 and Intel SGX SDK 2.2 on Ubuntu 16.04.
+Occlum depends on [Rust SGX SDK](https://github.com/baidu/rust-sgx-sdk/) and [Intel SGX SDK](https://github.com/intel/linux-sgx/). So, make sure Rust SGX SDK and Intel SGX SDK can be built properly on your machine. We have tested with Rust SGX SDK 1.1, Rust nightly-2018-08-25 and Intel SGX SDK 2.2 on Ubuntu 16.04.
 
 ### Compile
 
 The first time to compile the project, there are some dependencies must be first downloaded. To do this, run the following commands
 
-    cd path/to/rusgx
+    cd path/to/occlum-libos
-    make init
+    make submodule
 
 Then, compile the project with the following commands
 
     cd src/
     make
 
-## How to use
+### Run tests
-
-The long-term goal is to integrate a dynamic loader into the library OS so that a single instance of Rusgx can run unmodified executables in multiple software-isolated processes. For now, we don't have to a dynamic loader; so, the temporary solution is to statically link the library OS and the executable together. Another related but different issue is the lack of the fully-fleged C standard library. We now use SGX SDK's tlibc, as it does not depend on syscalls and hence is easy to integrate. We plan to use musl libc in the future.
-
-### Run all tests
 
 Build and run all tests with the following commands
 
-    cd test/
-    make
     make test
 
-### Write new program or test
+## How to Use?
 
-Add a C file, say `try.c`, in `/test`. To compile the program, run
+To be written...
 
-    make try
+## How it Works?
 
-To run the program, run
+To be written...
 
-    make test-try
+### Architecture Overview
 
+To be written...
+
+### Software Isolated Processes (SIPs)
+
+To be written...
+
+## Why the Name?
+
+The project name Occlum stems from the word *Occlumency* coined in Harry Porter series by J. K. Rowling. In *Harry Porter and the Order of Pheonix*, Occlumency is described as:
+
+> The magical defence of the mind against external penetration. An obscure branch of magic, but a highly useful one... Used properly, the power of Occlumency wil help sheild you from access or influence.
+
+The same thing can be said to Occlum, not for mind, but program:
+
+> The magical defence of the program agaist external penetration. An obsecure branch of technology, but a highly useful one... Used properly, the power of Occlum will help sheild your program from access or influence.
+
+Of course, Occlum must be run on Intel x86 CPUs with SGX support to do its magic.