Remove old test code

There is some code that I had there after messing with some of the
topics on Uros' blog (https://popovicu.com/), but that became irrelevant
after working on some other projects (e.g. fbos) or on other examples.

This commit also brings about a major overhaul on the structure of the
project. Hopefully it's now at a more ready state.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>

1 files changed, 17 insertions, 3 deletions

diff --git a/README.md b/README.md
index f61f177..a31a3f5 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,18 @@
-Basic stuff at `basics`. Using features from the Linux Kernel in `linux`.
+A bunch of code to messes with low level stuff. That is:
 
-Experiments for `kernel`, `bios` and `init` taken from
-[@popovicu](https://github.com/popovicu) and his blog.
+- `arch`:
+  - `machine`: prints "hello, world" on the serial port while running in M mode
+    on QEMU. Check the [README file](./arch/riscv/machine/README.md) for more
+    info.
+  - `supervisor/hsm`: using the HSM extension from SBI to gather info from
+    harts.
+  - `user/`:
+    - `basics`: bunch of code checking on basic programming concepts from the
+      RISC-V ISA.
+    - `hwprobe`: using the `hwprobe` system call from the Linux kernel to check
+      on the features from the current machine.
+- `kernel/dtm`: simple kernel module showcasing the API from the `of` driver.
+
+A lot of this is not taken solely from my brain, and I will give credit whenever
+it's relevant to each piece of code. For the rest of the code, the GPLv3+
+license applies.