[RFC PATCH V3 1/4] rust/hw/core: Add the BusState of rust version

[Chen Miao]

From: chenmiao <chen...@openatom.club>

A Rust version implementation has been designed for BusState,
which will be used for the subsequent I2CBus implementation.

Signed-off-by: Chen Miao <chen...@openatom.club>
Signed-off-by: Chao Liu <chao...@openatom.club>
---
rust/hw/core/meson.build | 1 +
rust/hw/core/src/bus.rs | 44 ++++++++++++++++++++++++++++++++++++++++
rust/hw/core/src/lib.rs | 3 +++
3 files changed, 48 insertions(+)
create mode 100644 rust/hw/core/src/bus.rs

diff --git a/rust/hw/core/meson.build b/rust/hw/core/meson.build
index 1560dd20c6..efcda50fef 100644
--- a/rust/hw/core/meson.build
+++ b/rust/hw/core/meson.build
@@ -50,6 +50,7 @@ _hwcore_rs = static_library(
[
'src/lib.rs',
'src/bindings.rs',
+ 'src/bus.rs',
'src/irq.rs',
'src/qdev.rs',
'src/sysbus.rs',
diff --git a/rust/hw/core/src/bus.rs b/rust/hw/core/src/bus.rs
new file mode 100644
index 0000000000..d3fbf519d4
--- /dev/null
+++ b/rust/hw/core/src/bus.rs
@@ -0,0 +1,44 @@
+// Copyright 2025 HUST OpenAtom Open Source Club.
+// Author(s): Chen Miao <chen...@openatom.club>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+use std::ffi::CStr;
+
+pub use bindings::BusClass;
+use common::Opaque;
+use qom::{qom_isa, IsA, Object, ObjectDeref, ObjectType};
+
+use crate::{bindings, DeviceImpl};
+
+#[repr(transparent)]
+#[derive(Debug, common::Wrapper)]
+pub struct BusState(Opaque<bindings::BusState>);
+
+unsafe impl Send for BusState {}
+unsafe impl Sync for BusState {}
+
+unsafe impl ObjectType for BusState {
+ type Class = BusClass;
+ const TYPE_NAME: &'static std::ffi::CStr =
+ unsafe { CStr::from_bytes_with_nul_unchecked(bindings::TYPE_BUS) };
+}
+
+qom_isa!(BusState: Object);
+
+pub trait BusStateImpl: DeviceImpl + IsA<BusState> {}
+
+impl BusClass {
+ pub fn class_init<T: BusStateImpl>(self: &mut BusClass) {
+ self.parent_class.class_init::<T>();
+ }
+}
+
+pub trait BusMethods: ObjectDeref
+where
+ Self::Target: IsA<BusState>,
+{
+ // TODO: Since the bus does not currently provide services to other
+ // components, we have not implemented any functions yet.
+}
+
+impl<R: ObjectDeref> BusMethods for R where R::Target: IsA<BusState> {}
diff --git a/rust/hw/core/src/lib.rs b/rust/hw/core/src/lib.rs
index b40801eb84..10cc516664 100644
--- a/rust/hw/core/src/lib.rs
+++ b/rust/hw/core/src/lib.rs
@@ -13,3 +13,6 @@

mod sysbus;
pub use sysbus::*;
+
+mod bus;
+pub use bus::*;
--
2.51.1

[Chao Liu]

LGTM

Thank,
Chao

[Chen Miao]

--
2.43.0