[RFC PATCH v1 2/4] rust: phy: add module device table support

[FUJITA Tomonori <fujita.tomonori@gmail.com>]

This macro corresponds to the kernel's MODULE_DEVICE_TABLE macro,
which embeds the information for module loading into the module binary
file.


Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
---
 rust/kernel/net/phy.rs | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs
index 2c5ac5e3213a..ffe1a609a7b2 100644
--- a/rust/kernel/net/phy.rs
+++ b/rust/kernel/net/phy.rs
@@ -649,3 +649,39 @@ unsafe impl<const N: usize> Send for Registration<{ N }> {}
 
 // SAFETY: `Registration` does not expose any of its state across threads.
 unsafe impl<const N: usize> Sync for Registration<{ N }> {}
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! replace_expr {
+    ($_t:tt $sub:expr) => {
+        $sub
+    };
+}
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! count_drivers {
+    ( $(($x:expr, $_y:expr)),* ) => {
+        0usize $(+ $crate::replace_expr!($x 1usize))*
+    };
+}
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! mdio_device_id_table {
+    ($(($x:expr, $y:expr)),*) => {
+        [$(kernel::bindings::mdio_device_id {phy_id: $x, phy_id_mask:$y}),*, kernel::bindings::mdio_device_id {phy_id:0, phy_id_mask:0}]
+    }
+}
+
+/// Defines module device table.
+///
+/// This corresponds to the kernel's MODULE_DEVICE_TABLE macro, which embeds the information
+/// for module loading into the module binary file.
+#[macro_export]
+macro_rules! phy_module_device_table {
+    ($name:ident, [$($t:tt)*]) => {
+        #[no_mangle]
+        static $name: [kernel::bindings::mdio_device_id; $crate::count_drivers!($($t)*)+1] = $crate::mdio_device_id_table!($($t)*);
+    }
+}
-- 
2.34.1