1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/android/rust_binder.rs b/drivers/android/rust_binder.rs
new file mode 100644
index 000000000000..d059077238ce
--- /dev/null
+++ b/drivers/android/rust_binder.rs
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Binder -- the Android IPC mechanism.
+//!
+//! TODO: This module is a work in progress.
+
+use kernel::{
+    io_buffer::IoBufferWriter,
+    linked_list::{GetLinks, GetLinksWrapped, Links},
+    miscdev::Registration,
+    prelude::*,
+    str::CStr,
+    sync::Ref,
+    user_ptr::UserSlicePtrWriter,
+};
+
+mod allocation;
+mod context;
+mod defs;
+mod node;
+mod process;
+mod range_alloc;
+mod thread;
+mod transaction;
+
+use {context::Context, thread::Thread};
+
+module! {
+    type: BinderModule,
+    name: b"rust_binder",
+    author: b"Wedson Almeida Filho",
+    description: b"Android Binder",
+    license: b"GPL",
+}
+
+enum Either<L, R> {
+    Left(L),
+    Right(R),
+}
+
+trait DeliverToRead {
+    /// Performs work. Returns true if remaining work items in the queue should be processed
+    /// immediately, or false if it should return to caller before processing additional work
+    /// items.
+    fn do_work(self: Ref<Self>, thread: &Thread, writer: &mut UserSlicePtrWriter) -> Result<bool>;
+
+    /// Cancels the given work item. This is called instead of [`DeliverToRead::do_work`] when work
+    /// won't be delivered.
+    fn cancel(self: Ref<Self>) {}
+
+    /// Returns the linked list links for the work item.
+    fn get_links(&self) -> &Links<dyn DeliverToRead>;
+}
+
+struct DeliverToReadListAdapter {}
+
+impl GetLinks for DeliverToReadListAdapter {
+    type EntryType = dyn DeliverToRead;
+
+    fn get_links(data: &Self::EntryType) -> &Links<Self::EntryType> {
+        data.get_links()
+    }
+}
+
+impl GetLinksWrapped for DeliverToReadListAdapter {
+    type Wrapped = Ref<dyn DeliverToRead>;
+}
+
+struct DeliverCode {
+    code: u32,
+    links: Links<dyn DeliverToRead>,
+}
+
+impl DeliverCode {
+    fn new(code: u32) -> Self {
+        Self {
+            code,
+            links: Links::new(),
+        }
+    }
+}
+
+impl DeliverToRead for DeliverCode {
+    fn do_work(self: Ref<Self>, _thread: &Thread, writer: &mut UserSlicePtrWriter) -> Result<bool> {
+        writer.write(&self.code)?;
+        Ok(true)
+    }
+
+    fn get_links(&self) -> &Links<dyn DeliverToRead> {
+        &self.links
+    }
+}
+
+const fn ptr_align(value: usize) -> usize {
+    let size = core::mem::size_of::<usize>() - 1;
+    (value + size) & !size
+}
+
+unsafe impl Sync for BinderModule {}
+
+struct BinderModule {
+    _reg: Pin<Box<Registration<process::Process>>>,
+}
+
+impl kernel::Module for BinderModule {
+    fn init(name: &'static CStr, _module: &'static kernel::ThisModule) -> Result<Self> {
+        let ctx = Context::new()?;
+        let reg = Registration::new_pinned(fmt!("{name}"), ctx)?;
+        Ok(Self { _reg: reg })
+    }
+}