From 0451dd3c6eb59084878591734ab1a19edf45fd27 Mon Sep 17 00:00:00 2001
From: pjht <terppa05@gmail.com>
Date: Tue, 1 Nov 2022 12:41:15 -0500
Subject: [PATCH] Initial commit

---
 .gitignore          |   1 +
 Cargo.lock          | 325 ++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml          |  18 +++
 rust-toolchain.toml |   2 +
 src/lib.rs          |  54 ++++++++
 5 files changed, 400 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 rust-toolchain.toml
 create mode 100644 src/lib.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..eb5a316
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..e56c185
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,325 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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+dependencies = [
+ "getrandom",
+ "once_cell",
+ "version_check",
+]
+
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+
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+
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+ "postcard",
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+ "rustversion",
+ "volatile",
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+dependencies = [
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7e08e7b
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "dev_driver_rpc"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+postcard = { version = "1.0.2", default-features = false, features = ["alloc"] }
+serde = { version = "1.0.144", default-features = false, features = ["alloc", "derive"] }
+spin = "0.9.4"
+std = { version = "0.1.0", path = "../std" }
+
+[profile.dev]
+panic="abort"
+
+[profile.release]
+panic="abort"
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..5d56faf
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..b0346d2
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,54 @@
+#![no_std]
+#![allow(clippy::result_unit_err)]
+
+use std::{
+    boxed::Box,
+    io,
+    ipc::rpc::{self, IncomingCall},
+};
+
+use spin::RwLock;
+
+static SERVER: RwLock<Option<Box<dyn Server>>> = RwLock::new(None);
+
+const PROTO: u16 = 0;
+
+pub trait Server: Send + Sync {
+    fn open(&self, path: &str) -> Result<u64, io::Error>;
+}
+
+#[derive(Copy, Clone)]
+pub struct Client(u64);
+
+impl Client {
+    pub fn new(pid: u64) -> Self {
+        Self(pid)
+    }
+
+    pub fn open(self, path: &str) -> Result<u64, io::Error> {
+        postcard::from_bytes(
+            &rpc::send_call(self.0, PROTO, 0, &postcard::to_allocvec(path).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 path = postcard::from_bytes(&call.args).unwrap();
+        let ret = postcard::to_allocvec(&server.open(path)).unwrap();
+        call.send_return(&ret);
+    }
+}