// SPDX-License-Identifier: GPL-2.0 //! Device Tree / Open Firmware abstractions. use crate::{    bindings,    device_id::{RawDeviceId, RawDeviceIdIndex},    prelude::*,}; /// IdTable type for OF drivers.pub type IdTable<T> = &'static dyn kernel::device_id::IdTable<DeviceId, T>; /// An open firmware device id.#[repr(transparent)]#[derive(Clone, Copy)]pub struct DeviceId(bindings::of_device_id); // SAFETY: `DeviceId` is a `#[repr(transparent)]` wrapper of `struct of_device_id` and// does not add additional invariants, so it's safe to transmute to `RawType`.unsafe impl RawDeviceId for DeviceId {    type RawType = bindings::of_device_id;} // SAFETY: `DRIVER_DATA_OFFSET` is the offset to the `data` field.unsafe impl RawDeviceIdIndex for DeviceId {    const DRIVER_DATA_OFFSET: usize = core::mem::offset_of!(bindings::of_device_id, data);} impl DeviceId {    /// Create a new device id from an OF 'compatible' string.    pub const fn new(compatible: &'static CStr) -> Self {        let src = compatible.to_bytes_with_nul();        // Replace with `bindings::of_device_id::default()` once stabilized for `const`.        // SAFETY: FFI type is valid to be zero-initialized.        let mut of: bindings::of_device_id = unsafe { core::mem::zeroed() };         // TODO: Use `copy_from_slice` once stabilized for `const`.        let mut i = 0;        while i < src.len() {            of.compatible[i] = src[i];            i += 1;        }         Self(of)    }} /// Create an OF `IdTable` with an "alias" for modpost.#[macro_export]macro_rules! of_device_table {    ($($tt:tt)*) => {        $crate::module_device_table!("of", $crate::of::DeviceId, $($tt)*);    };}