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#![feature(core_intrinsics)]
#![cfg_attr(unix, feature(libc))]
#![no_std]

#[cfg_attr(unix, macro_use)]
#[cfg(unix)]
extern crate std;

#[cfg(unix)]
extern crate byteorder;
#[cfg(unix)]
extern crate libc;
#[cfg_attr(unix, macro_use(matches, assert_matches))]
#[cfg(unix)]
extern crate matches;

#[cfg(unix)]
extern crate mmap;

#[cfg(target_os = "barrelfish")]
extern crate libbarrelfish;

#[cfg_attr(unix, macro_use)]
extern crate log;

extern crate bit_field;
extern crate x86;

use core::fmt;
use core::intrinsics::{volatile_load, volatile_store};
use core::ops::{BitAnd, BitOr, Not};

#[macro_use]
pub mod bitops;
#[cfg(unix)]
pub mod timedops;

/// Interface definitions for network devices.
pub mod net;

#[cfg(target_os = "barrelfish")]
mod barrelfish;

#[cfg(target_os = "linux")]
mod linux;

#[cfg(target_os = "barrelfish")]
pub use barrelfish::*;

#[cfg(target_os = "linux")]
pub use linux::*;

#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum DriverState {
    Uninitialized,
    Initialized,
    Attached(usize),
    Detached,
    Destroyed,
}

/// Driver life-cycle management trait
pub trait DriverControl: Sized {
    /// Initialize the device
    /// DriverState must be Uninitialized
    fn init(&mut self) {
        assert!(self.state() == DriverState::Uninitialized);
        self.set_state(DriverState::Initialized);
    }

    /// Attach the driver to the device (claim ownership)
    /// DriverState must be Initialized, Detached or Attached(x)
    fn attach(&mut self) {
        #[cfg(unix)]
        assert!(
            self.state() == DriverState::Initialized
                || self.state() == DriverState::Detached
                || matches!(self.state(), DriverState::Attached(_))
        );
        self.set_state(DriverState::Attached(0));
    }

    /// Detach the driver from the device
    /// DriverState must be Detached, Attached(x)
    fn detach(&mut self) {
        #[cfg(unix)]
        assert!(matches!(self.state(), DriverState::Attached(_)));
        self.set_state(DriverState::Detached);
    }

    /// Detach the driver from the device
    /// DriverState must be Detached, Attached(x)
    fn set_sleep_level(&mut self, level: usize) {
        #[cfg(unix)]
        assert_matches!(self.state(), DriverState::Attached(_));
        self.set_state(DriverState::Attached(level));
    }

    fn destroy(mut self) {
        #[cfg(unix)]
        assert!(matches!(self.state(), DriverState::Attached(_)));
        self.set_state(DriverState::Destroyed);
    }

    fn state(&self) -> DriverState;
    fn set_state(&mut self, ds: DriverState);
}

#[repr(C, packed)]
pub struct Volatile<T> {
    value: T,
}

impl<T> Volatile<T>
where
    T: Copy + PartialEq + BitAnd<Output = T> + BitOr<Output = T> + Not<Output = T>,
{
    pub fn new() -> Self {
        Volatile {
            value: unsafe { core::mem::MaybeUninit::zeroed().assume_init() },
        }
    }

    /// Create a volatile with an initial value.
    pub fn with_value(value: T) -> Volatile<T> {
        Volatile { value: value }
    }

    #[inline]
    pub fn get(&self) -> T {
        unsafe { volatile_load(&self.value) }
    }

    #[inline]
    pub fn set(&mut self, value: T) {
        unsafe { volatile_store(&self.value as *const T as *mut T, value) }
    }
}

impl<T: fmt::Debug> fmt::Debug for Volatile<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        unsafe { write!(f, "{:?}", self.value) }
    }
}

impl<T: fmt::Display> fmt::Display for Volatile<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        unsafe { write!(f, "{}", self.value) }
    }
}

pub trait MsrInterface {
    unsafe fn write(&mut self, msr: u32, value: u64) {
        x86::msr::wrmsr(msr, value);
    }

    unsafe fn read(&mut self, msr: u32) -> u64 {
        x86::msr::rdmsr(msr)
    }
}