tiny_os/src/mm/addr.rs

use core::fmt::{Debug, Display, Formatter, LowerHex, Result, UpperHex};
use core::hash::Hash;
use core::ops::{Add, AddAssign, Sub, SubAssign};

#[inline(always)]
fn align_up(addr: usize, align: usize) -> usize {
    (addr + align - 1) & !(align - 1)
}

#[inline(always)]
fn align_down(addr: usize, align: usize) -> usize {
    addr & !(align - 1)
}

pub struct PhysAddr(pub usize);

pub struct VirtAddr(pub usize);

pub trait AddressOps {
    fn as_u32(&self) -> u32;
    fn as_u64(&self) -> u64;
    fn as_usize(&self) -> usize;
    fn align_up<T>(&self, align: T) -> Self
    where
        T: Into<usize>;
    fn align_down<T>(&self, align: T) -> Self
    where
        T: Into<usize>;
    fn is_aligned<T>(&self, align: T) -> bool
    where
        T: Into<usize> + Copy,
    {
        if align.into().is_power_of_two() {
            self.as_usize() & (align.into() - 1) == 0
        } else {
            false
        }
    }
}

impl AddressOps for PhysAddr {
    fn as_u32(&self) -> u32 {
        self.0 as u32
    }

    fn as_u64(&self) -> u64 {
        self.0 as u64
    }

    fn as_usize(&self) -> usize {
        self.0
    }

    fn align_up<T>(&self, align: T) -> Self
    where
        T: Into<usize>,
    {
        PhysAddr(align_up(self.0, align.into()))
    }

    fn align_down<T>(&self, align: T) -> Self
    where
        T: Into<usize>,
    {
        PhysAddr(align_down(self.0, align.into()))
    }
}

impl AddressOps for VirtAddr {
    fn as_u32(&self) -> u32 {
        self.0 as u32
    }

    fn as_u64(&self) -> u64 {
        self.0 as u64
    }

    fn as_usize(&self) -> usize {
        self.0
    }

    fn align_up<T>(&self, align: T) -> Self
    where
        T: Into<usize>,
    {
        VirtAddr(align_up(self.0, align.into()))
    }

    fn align_down<T>(&self, align: T) -> Self
    where
        T: Into<usize>,
    {
        VirtAddr(align_down(self.0, align.into()))
    }
}

impl Add<usize> for PhysAddr {
    type Output = Self;

    fn add(self, rhs: usize) -> Self::Output {
        Self(self.0 + rhs)
    }
}

impl AddAssign<usize> for PhysAddr {
    fn add_assign(&mut self, rhs: usize) {
        *self = PhysAddr::from(self.0 + rhs);
    }
}

impl Sub<usize> for PhysAddr {
    type Output = PhysAddr;

    fn sub(self, rhs: usize) -> Self::Output {
        PhysAddr(self.0 - rhs)
    }
}

impl SubAssign<usize> for PhysAddr {
    fn sub_assign(&mut self, rhs: usize) {
        *self = PhysAddr::from(self.0 - rhs);
    }
}

impl Add<usize> for VirtAddr {
    type Output = Self;

    fn add(self, rhs: usize) -> Self::Output {
        Self(self.0 + rhs)
    }
}

impl AddAssign<usize> for VirtAddr {
    fn add_assign(&mut self, rhs: usize) {
        *self = VirtAddr::from(self.0 + rhs);
    }
}

impl Sub<usize> for VirtAddr {
    type Output = VirtAddr;

    fn sub(self, rhs: usize) -> Self::Output {
        VirtAddr(self.0 - rhs)
    }
}

impl SubAssign<usize> for VirtAddr {
    fn sub_assign(&mut self, rhs: usize) {
        *self = VirtAddr::from(self.0 - rhs);
    }
}

impl From<usize> for PhysAddr {
    fn from(addr: usize) -> Self {
        PhysAddr(addr)
    }
}

impl From<PhysAddr> for usize {
    fn from(addr: PhysAddr) -> Self {
        addr.0
    }
}

impl From<usize> for VirtAddr {
    fn from(addr: usize) -> Self {
        VirtAddr(addr)
    }
}

impl From<VirtAddr> for usize {
    fn from(addr: VirtAddr) -> Self {
        addr.0
    }
}

impl Debug for PhysAddr {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "PhysAddr({:#x})", self.0)
    }
}

impl Display for PhysAddr {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "{:#x}", self.0)
    }
}

impl LowerHex for PhysAddr {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "{:#x}", self.0)
    }
}

impl UpperHex for PhysAddr {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "{:#X}", self.0)
    }
}

impl Debug for VirtAddr {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "VirtAddr({:#x})", self.0)
    }
}

impl Display for VirtAddr {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "{:#x}", self.0)
    }
}

impl LowerHex for VirtAddr {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "{:#x}", self.0)
    }
}

impl UpperHex for VirtAddr {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "{:#X}", self.0)
    }
}

impl Hash for PhysAddr {
    fn hash<H: core::hash::Hasher>(&self, state: &mut H) {
        self.0.hash(state);
    }
}

impl Hash for VirtAddr {
    fn hash<H: core::hash::Hasher>(&self, state: &mut H) {
        self.0.hash(state);
    }
}