// SPDX-License-Identifier: MIT OR Apache-2.0
//
// Copyright (c) 2020-2022 Andre Richter <andre.o.richter@gmail.com>

//! Common device driver code.

use crate::memory::{Address, Virtual};
use core::{marker::PhantomData, ops};

//--------------------------------------------------------------------------------------------------
// Public Definitions
//--------------------------------------------------------------------------------------------------

pub struct MMIODerefWrapper<T> {
    start_addr: Address<Virtual>,
    phantom: PhantomData<fn() -> T>,
}

//--------------------------------------------------------------------------------------------------
// Public Code
//--------------------------------------------------------------------------------------------------

impl<T> MMIODerefWrapper<T> {
    /// Create an instance.
    pub const unsafe fn new(start_addr: Address<Virtual>) -> Self {
        Self {
            start_addr,
            phantom: PhantomData,
        }
    }
}

impl<T> ops::Deref for MMIODerefWrapper<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        unsafe { &*(self.start_addr.as_usize() as *const _) }
    }
}