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use super::PageTableEntry;
use crate::config::{PAGE_SIZE, PAGE_SIZE_BITS};
use core::fmt::{self, Debug, Formatter};
const PA_WIDTH_SV39: usize = 56;
const VA_WIDTH_SV39: usize = 39;
const PPN_WIDTH_SV39: usize = PA_WIDTH_SV39 - PAGE_SIZE_BITS;
const VPN_WIDTH_SV39: usize = VA_WIDTH_SV39 - PAGE_SIZE_BITS;
#[repr(C)]
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
pub struct PhysAddr(pub usize);
#[repr(C)]
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
pub struct VirtAddr(pub usize);
#[repr(C)]
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
pub struct PhysPageNum(pub usize);
#[repr(C)]
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
pub struct VirtPageNum(pub usize);
impl Debug for VirtAddr {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.write_fmt(format_args!("VA:{:#x}", self.0))
}
}
impl Debug for VirtPageNum {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.write_fmt(format_args!("VPN:{:#x}", self.0))
}
}
impl Debug for PhysAddr {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.write_fmt(format_args!("PA:{:#x}", self.0))
}
}
impl Debug for PhysPageNum {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.write_fmt(format_args!("PPN:{:#x}", self.0))
}
}
impl From<usize> for PhysAddr {
fn from(v: usize) -> Self {
Self(v & ((1 << PA_WIDTH_SV39) - 1))
}
}
impl From<usize> for PhysPageNum {
fn from(v: usize) -> Self {
Self(v & ((1 << PPN_WIDTH_SV39) - 1))
}
}
impl From<usize> for VirtAddr {
fn from(v: usize) -> Self {
Self(v & ((1 << VA_WIDTH_SV39) - 1))
}
}
impl From<usize> for VirtPageNum {
fn from(v: usize) -> Self {
Self(v & ((1 << VPN_WIDTH_SV39) - 1))
}
}
impl From<PhysAddr> for usize {
fn from(v: PhysAddr) -> Self {
v.0
}
}
impl From<PhysPageNum> for usize {
fn from(v: PhysPageNum) -> Self {
v.0
}
}
impl From<VirtAddr> for usize {
fn from(v: VirtAddr) -> Self {
if v.0 >= (1 << (VA_WIDTH_SV39 - 1)) {
v.0 | (!((1 << VA_WIDTH_SV39) - 1))
} else {
v.0
}
}
}
impl From<VirtPageNum> for usize {
fn from(v: VirtPageNum) -> Self {
v.0
}
}
impl VirtAddr {
pub fn floor(&self) -> VirtPageNum {
VirtPageNum(self.0 / PAGE_SIZE)
}
pub fn ceil(&self) -> VirtPageNum {
VirtPageNum((self.0 - 1 + PAGE_SIZE) / PAGE_SIZE)
}
pub fn page_offset(&self) -> usize {
self.0 & (PAGE_SIZE - 1)
}
pub fn aligned(&self) -> bool {
self.page_offset() == 0
}
}
impl From<VirtAddr> for VirtPageNum {
fn from(v: VirtAddr) -> Self {
assert_eq!(v.page_offset(), 0);
v.floor()
}
}
impl From<VirtPageNum> for VirtAddr {
fn from(v: VirtPageNum) -> Self {
Self(v.0 << PAGE_SIZE_BITS)
}
}
impl PhysAddr {
pub fn floor(&self) -> PhysPageNum {
PhysPageNum(self.0 / PAGE_SIZE)
}
pub fn ceil(&self) -> PhysPageNum {
PhysPageNum((self.0 - 1 + PAGE_SIZE) / PAGE_SIZE)
}
pub fn page_offset(&self) -> usize {
self.0 & (PAGE_SIZE - 1)
}
pub fn aligned(&self) -> bool {
self.page_offset() == 0
}
}
impl From<PhysAddr> for PhysPageNum {
fn from(v: PhysAddr) -> Self {
assert_eq!(v.page_offset(), 0);
v.floor()
}
}
impl From<PhysPageNum> for PhysAddr {
fn from(v: PhysPageNum) -> Self {
Self(v.0 << PAGE_SIZE_BITS)
}
}
impl VirtPageNum {
pub fn indexes(&self) -> [usize; 3] {
let mut vpn = self.0;
let mut idx = [0usize; 3];
for i in (0..3).rev() {
idx[i] = vpn & 511;
vpn >>= 9;
}
idx
}
}
impl PhysAddr {
pub fn get_ref<T>(&self) -> &'static T {
unsafe { (self.0 as *const T).as_ref().unwrap() }
}
pub fn get_mut<T>(&self) -> &'static mut T {
unsafe { (self.0 as *mut T).as_mut().unwrap() }
}
}
impl PhysPageNum {
pub fn get_pte_array(&self) -> &'static mut [PageTableEntry] {
let pa: PhysAddr = (*self).into();
unsafe { core::slice::from_raw_parts_mut(pa.0 as *mut PageTableEntry, 512) }
}
pub fn get_bytes_array(&self) -> &'static mut [u8] {
let pa: PhysAddr = (*self).into();
unsafe { core::slice::from_raw_parts_mut(pa.0 as *mut u8, 4096) }
}
pub fn get_mut<T>(&self) -> &'static mut T {
let pa: PhysAddr = (*self).into();
pa.get_mut()
}
}
pub trait StepByOne {
fn step(&mut self);
}
impl StepByOne for VirtPageNum {
fn step(&mut self) {
self.0 += 1;
}
}
impl StepByOne for PhysPageNum {
fn step(&mut self) {
self.0 += 1;
}
}
#[derive(Copy, Clone)]
pub struct SimpleRange<T>
where
T: StepByOne + Copy + PartialEq + PartialOrd + Debug,
{
l: T,
r: T,
}
impl<T> SimpleRange<T>
where
T: StepByOne + Copy + PartialEq + PartialOrd + Debug,
{
pub fn new(start: T, end: T) -> Self {
assert!(start <= end, "start {:?} > end {:?}!", start, end);
Self { l: start, r: end }
}
pub fn get_start(&self) -> T {
self.l
}
pub fn get_end(&self) -> T {
self.r
}
}
impl<T> IntoIterator for SimpleRange<T>
where
T: StepByOne + Copy + PartialEq + PartialOrd + Debug,
{
type Item = T;
type IntoIter = SimpleRangeIterator<T>;
fn into_iter(self) -> Self::IntoIter {
SimpleRangeIterator::new(self.l, self.r)
}
}
pub struct SimpleRangeIterator<T>
where
T: StepByOne + Copy + PartialEq + PartialOrd + Debug,
{
current: T,
end: T,
}
impl<T> SimpleRangeIterator<T>
where
T: StepByOne + Copy + PartialEq + PartialOrd + Debug,
{
pub fn new(l: T, r: T) -> Self {
Self { current: l, end: r }
}
}
impl<T> Iterator for SimpleRangeIterator<T>
where
T: StepByOne + Copy + PartialEq + PartialOrd + Debug,
{
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
if self.current == self.end {
None
} else {
let t = self.current;
self.current.step();
Some(t)
}
}
}
pub type VPNRange = SimpleRange<VirtPageNum>;