sv39 0.2.0

An implementation of sv39 paging system for RISC-V
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use crate::paging::{PhysAddr, VirtAddr};

pub mod alloc;
pub mod mapper;

// TODO(Juanperias): manage more than 4 KIB pages

/// It represents a virtual frame of 4 kib, or, more formally, a “page”
pub struct Page(VirtAddr);

impl Page {
    pub fn new(addr: VirtAddr) -> Self {
        Self(addr)
    }

    pub fn as_mut_ptr(&self) -> *mut u8 {
        self.0.addr() as *mut u8
    }

    pub fn as_ptr(&self) -> *const u8 {
        self.0.addr() as *const u8
    }

    pub fn start_address_virt(&self) -> &VirtAddr {
        &self.0
    }

    pub fn start_address(&self) -> u64 {
        self.start_address_virt().addr()
    }
}

/// It represents a physical frame of 4 kib, or, more formally, a “phys frame”
pub struct PhysFrame(PhysAddr);

impl PhysFrame {
    pub fn new(phys: PhysAddr) -> Self {
        Self(phys)
    }

    pub fn start_address_phys(&self) -> &PhysAddr {
        &self.0
    }

    pub fn start_address(&self) -> u64 {
        self.start_address_phys().addr()
    }
}

/*
pub trait PageSize {
    const SIZE: usize;
}

pub struct Size4Kib;

impl PageSize for Size4Kib {
   const SIZE: usize = 4096;
}

pub struct Size2Mib;

impl PageSize for Size2Mib {
    const SIZE: usize = 2 << 20;
}


pub struct Size1Gib;

impl PageSize for Size1Gib {
    const SIZE: usize = 1 << 30;
}

*/