commit a74a802f76c142ac5144b3e0b4e503c0870ed8b6
Author: pjht <pterpstra@pterpstra.com>
Date:   Sun Jun 9 18:29:01 2024 -0500

    Initial commit

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diff --git a/devfs_rpc/Cargo.toml b/devfs_rpc/Cargo.toml
new file mode 100644
index 0000000..395849a
--- /dev/null
+++ b/devfs_rpc/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "devfs_rpc"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+parking_lot = "0.12.3"
+rmp-serde = "1.3.0"
+serde = { version = "1.0.203", features = ["derive"] }
diff --git a/devfs_rpc/src/lib.rs b/devfs_rpc/src/lib.rs
new file mode 100644
index 0000000..863e01a
--- /dev/null
+++ b/devfs_rpc/src/lib.rs
@@ -0,0 +1,51 @@
+#![allow(clippy::result_unit_err)]
+
+use std::{
+    os::mikros::ipc::rpc::{self, IncomingCall}, path::Path,
+};
+
+use parking_lot::RwLock;
+
+static SERVER: RwLock<Option<Box<dyn Server>>> = RwLock::new(None);
+
+const PROTO: u16 = 4;
+
+pub trait Server: Send + Sync {
+    fn register_dev(&self, from: u64, name: &str) -> Result<(), ()>;
+}
+
+#[derive(Copy, Clone)]
+pub struct Client(u64);
+
+impl Client {
+    pub fn new(pid: u64) -> Self {
+        Self(pid)
+    }
+
+    pub fn register_dev(self, name: &str) -> Result<(), ()> {
+        rmp_serde::from_slice(
+            &rpc::send_call(self.0, PROTO, 0, &rmp_serde::to_vec(name).unwrap()).get_return(),
+        )
+        .unwrap()
+    }
+}
+
+pub fn register_server(server: Box<dyn Server>) {
+    *SERVER.write() = Some(server);
+    rpc::register_callback(PROTO, callback);
+}
+
+pub fn unregister_server() {
+    rpc::unregister_callback(PROTO);
+    *SERVER.write() = None;
+}
+
+fn callback(call: IncomingCall) {
+    let server_lock = SERVER.read();
+    let server = server_lock.as_ref().unwrap();
+    if call.func == 0 {
+        let kind = rmp_serde::from_slice(&call.args).unwrap();
+        let ret = rmp_serde::to_vec(&server.register_dev(call.from, kind)).unwrap();
+        call.send_return(&ret);
+    }
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..a5535e3
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "dev-x86_64-unknown-mikros"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..faa9d1d
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,48 @@
+use std::{collections::HashMap, os::mikros::{ipc, syscalls}, sync::Arc};
+
+use parking_lot::RwLock;
+
+#[derive(Debug, Clone)]
+struct Serv {
+    devices: Arc<RwLock<HashMap<String, u64>>>,
+}
+
+impl fs_rpc::Server for Serv {
+    fn mount(&self, _dev: &std::path::Path, _path: &std::path::Path) -> Result<u64, ()> {
+        Ok(0)
+    }
+
+    fn open(&self, path: &std::path::Path, _mount_id: u64) -> Result<(Option<u64>, u64), ()> {
+        let name = path.to_str().ok_or(())?;
+        let device_pid = *self.devices.read().get(name).ok_or(())?;
+        let fd = dev_driver_rpc::Client::new(device_pid).open(path)?;
+        Ok((Some(device_pid), fd))
+    }
+}
+
+impl devfs_rpc::Server for Serv {
+    fn register_dev(&self, from: u64, name: &str) -> Result<(), ()> {
+        self.devices.write().insert(name.to_owned(), from);
+        Ok(())
+    }
+}
+
+fn main() {
+    let serv = Serv {
+        devices: Arc::new(RwLock::new(HashMap::new()))
+    };
+    fs_rpc::register_server(Box::new(serv.clone()));
+    devfs_rpc::register_server(Box::new(serv));
+    let vfs_pid;
+    loop {
+        if let Some(pid) = syscalls::try_get_registered(0) {
+            vfs_pid = pid;
+            break;
+        }
+    }
+    vfs_rpc::Client::new(vfs_pid).register_fs("devfs").unwrap();
+    syscalls::register(1);
+    loop {
+        ipc::process_messages()
+    }
+}