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use core::fmt;
use core::ops::{Add, AddAssign, Sub, SubAssign};
use crate::structures::paging::{PageOffset, PageTableIndex};
use bit_field::BitField;
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
#[repr(transparent)]
pub struct VirtAddr(u64);
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
#[repr(transparent)]
pub struct PhysAddr(u64);
#[derive(Debug)]
pub struct VirtAddrNotValid(u64);
impl VirtAddr {
#[inline]
pub fn new(addr: u64) -> VirtAddr {
Self::try_new(addr).expect(
"address passed to VirtAddr::new must not contain any data \
in bits 48 to 64",
)
}
#[inline]
pub fn try_new(addr: u64) -> Result<VirtAddr, VirtAddrNotValid> {
match addr.get_bits(47..64) {
0 | 0x1ffff => Ok(VirtAddr(addr)),
1 => Ok(VirtAddr::new_truncate(addr)),
other => Err(VirtAddrNotValid(other)),
}
}
#[inline]
pub const fn new_truncate(addr: u64) -> VirtAddr {
VirtAddr(((addr << 16) as i64 >> 16) as u64)
}
#[inline]
pub const unsafe fn new_unsafe(addr: u64) -> VirtAddr {
VirtAddr(addr)
}
#[inline]
pub const fn zero() -> VirtAddr {
VirtAddr(0)
}
#[inline]
pub const fn as_u64(self) -> u64 {
self.0
}
#[cfg(any(target_pointer_width = "32", target_pointer_width = "64"))]
#[inline]
pub fn from_ptr<T>(ptr: *const T) -> Self {
Self::new(ptr as u64)
}
#[cfg(target_pointer_width = "64")]
#[inline]
pub fn as_ptr<T>(self) -> *const T {
self.as_u64() as *const T
}
#[cfg(target_pointer_width = "64")]
#[inline]
pub fn as_mut_ptr<T>(self) -> *mut T {
self.as_ptr::<T>() as *mut T
}
#[inline]
pub const fn is_null(self) -> bool {
self.0 == 0
}
#[inline]
pub fn align_up<U>(self, align: U) -> Self
where
U: Into<u64>,
{
VirtAddr(align_up(self.0, align.into()))
}
#[inline]
pub fn align_down<U>(self, align: U) -> Self
where
U: Into<u64>,
{
VirtAddr(align_down(self.0, align.into()))
}
#[inline]
pub fn is_aligned<U>(self, align: U) -> bool
where
U: Into<u64>,
{
self.align_down(align) == self
}
#[inline]
pub const fn page_offset(self) -> PageOffset {
PageOffset::new_truncate(self.0 as u16)
}
#[inline]
pub const fn p1_index(self) -> PageTableIndex {
PageTableIndex::new_truncate((self.0 >> 12) as u16)
}
#[inline]
pub const fn p2_index(self) -> PageTableIndex {
PageTableIndex::new_truncate((self.0 >> 12 >> 9) as u16)
}
#[inline]
pub const fn p3_index(self) -> PageTableIndex {
PageTableIndex::new_truncate((self.0 >> 12 >> 9 >> 9) as u16)
}
#[inline]
pub const fn p4_index(self) -> PageTableIndex {
PageTableIndex::new_truncate((self.0 >> 12 >> 9 >> 9 >> 9) as u16)
}
}
impl fmt::Debug for VirtAddr {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_tuple("VirtAddr")
.field(&format_args!("{:#x}", self.0))
.finish()
}
}
impl fmt::Binary for VirtAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Binary::fmt(&self.0, f)
}
}
impl fmt::LowerHex for VirtAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::LowerHex::fmt(&self.0, f)
}
}
impl fmt::Octal for VirtAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Octal::fmt(&self.0, f)
}
}
impl fmt::UpperHex for VirtAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::UpperHex::fmt(&self.0, f)
}
}
impl fmt::Pointer for VirtAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Pointer::fmt(&(self.0 as *const ()), f)
}
}
impl Add<u64> for VirtAddr {
type Output = Self;
#[inline]
fn add(self, rhs: u64) -> Self::Output {
VirtAddr::new(self.0 + rhs)
}
}
impl AddAssign<u64> for VirtAddr {
#[inline]
fn add_assign(&mut self, rhs: u64) {
*self = *self + rhs;
}
}
#[cfg(target_pointer_width = "64")]
impl Add<usize> for VirtAddr {
type Output = Self;
#[inline]
fn add(self, rhs: usize) -> Self::Output {
self + rhs as u64
}
}
#[cfg(target_pointer_width = "64")]
impl AddAssign<usize> for VirtAddr {
#[inline]
fn add_assign(&mut self, rhs: usize) {
self.add_assign(rhs as u64)
}
}
impl Sub<u64> for VirtAddr {
type Output = Self;
#[inline]
fn sub(self, rhs: u64) -> Self::Output {
VirtAddr::new(self.0.checked_sub(rhs).unwrap())
}
}
impl SubAssign<u64> for VirtAddr {
#[inline]
fn sub_assign(&mut self, rhs: u64) {
*self = *self - rhs;
}
}
#[cfg(target_pointer_width = "64")]
impl Sub<usize> for VirtAddr {
type Output = Self;
#[inline]
fn sub(self, rhs: usize) -> Self::Output {
self - rhs as u64
}
}
#[cfg(target_pointer_width = "64")]
impl SubAssign<usize> for VirtAddr {
#[inline]
fn sub_assign(&mut self, rhs: usize) {
self.sub_assign(rhs as u64)
}
}
impl Sub<VirtAddr> for VirtAddr {
type Output = u64;
#[inline]
fn sub(self, rhs: VirtAddr) -> Self::Output {
self.as_u64().checked_sub(rhs.as_u64()).unwrap()
}
}
#[derive(Debug)]
pub struct PhysAddrNotValid(u64);
impl PhysAddr {
#[inline]
pub fn new(addr: u64) -> PhysAddr {
assert_eq!(
addr.get_bits(52..64),
0,
"physical addresses must not have any bits in the range 52 to 64 set"
);
PhysAddr(addr)
}
#[inline]
pub const fn new_truncate(addr: u64) -> PhysAddr {
PhysAddr(addr % (1 << 52))
}
#[inline]
pub const unsafe fn new_unsafe(addr: u64) -> PhysAddr {
PhysAddr(addr)
}
#[inline]
pub fn try_new(addr: u64) -> Result<PhysAddr, PhysAddrNotValid> {
match addr.get_bits(52..64) {
0 => Ok(PhysAddr(addr)),
other => Err(PhysAddrNotValid(other)),
}
}
#[inline]
pub const fn zero() -> PhysAddr {
PhysAddr(0)
}
#[inline]
pub const fn as_u64(self) -> u64 {
self.0
}
#[inline]
pub const fn is_null(self) -> bool {
self.0 == 0
}
#[inline]
pub fn align_up<U>(self, align: U) -> Self
where
U: Into<u64>,
{
PhysAddr(align_up(self.0, align.into()))
}
#[inline]
pub fn align_down<U>(self, align: U) -> Self
where
U: Into<u64>,
{
PhysAddr(align_down(self.0, align.into()))
}
#[inline]
pub fn is_aligned<U>(self, align: U) -> bool
where
U: Into<u64>,
{
self.align_down(align) == self
}
}
impl fmt::Debug for PhysAddr {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_tuple("PhysAddr")
.field(&format_args!("{:#x}", self.0))
.finish()
}
}
impl fmt::Binary for PhysAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Binary::fmt(&self.0, f)
}
}
impl fmt::LowerHex for PhysAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::LowerHex::fmt(&self.0, f)
}
}
impl fmt::Octal for PhysAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Octal::fmt(&self.0, f)
}
}
impl fmt::UpperHex for PhysAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::UpperHex::fmt(&self.0, f)
}
}
impl fmt::Pointer for PhysAddr {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Pointer::fmt(&(self.0 as *const ()), f)
}
}
impl Add<u64> for PhysAddr {
type Output = Self;
#[inline]
fn add(self, rhs: u64) -> Self::Output {
PhysAddr::new(self.0 + rhs)
}
}
impl AddAssign<u64> for PhysAddr {
#[inline]
fn add_assign(&mut self, rhs: u64) {
*self = *self + rhs;
}
}
#[cfg(target_pointer_width = "64")]
impl Add<usize> for PhysAddr {
type Output = Self;
#[inline]
fn add(self, rhs: usize) -> Self::Output {
self + rhs as u64
}
}
#[cfg(target_pointer_width = "64")]
impl AddAssign<usize> for PhysAddr {
#[inline]
fn add_assign(&mut self, rhs: usize) {
self.add_assign(rhs as u64)
}
}
impl Sub<u64> for PhysAddr {
type Output = Self;
#[inline]
fn sub(self, rhs: u64) -> Self::Output {
PhysAddr::new(self.0.checked_sub(rhs).unwrap())
}
}
impl SubAssign<u64> for PhysAddr {
#[inline]
fn sub_assign(&mut self, rhs: u64) {
*self = *self - rhs;
}
}
#[cfg(target_pointer_width = "64")]
impl Sub<usize> for PhysAddr {
type Output = Self;
#[inline]
fn sub(self, rhs: usize) -> Self::Output {
self - rhs as u64
}
}
#[cfg(target_pointer_width = "64")]
impl SubAssign<usize> for PhysAddr {
#[inline]
fn sub_assign(&mut self, rhs: usize) {
self.sub_assign(rhs as u64)
}
}
impl Sub<PhysAddr> for PhysAddr {
type Output = u64;
#[inline]
fn sub(self, rhs: PhysAddr) -> Self::Output {
self.as_u64().checked_sub(rhs.as_u64()).unwrap()
}
}
#[inline]
pub const fn align_down(addr: u64, align: u64) -> u64 {
const_assert!(align.is_power_of_two(), "`align` must be a power of two");
addr & !(align - 1)
}
#[inline]
pub const fn align_up(addr: u64, align: u64) -> u64 {
const_assert!(align.is_power_of_two(), "`align` must be a power of two");
let align_mask = align - 1;
if addr & align_mask == 0 {
addr
} else {
(addr | align_mask) + 1
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
pub fn virtaddr_new_truncate() {
assert_eq!(VirtAddr::new_truncate(0), VirtAddr(0));
assert_eq!(VirtAddr::new_truncate(1 << 47), VirtAddr(0xfffff << 47));
assert_eq!(VirtAddr::new_truncate(123), VirtAddr(123));
assert_eq!(VirtAddr::new_truncate(123 << 47), VirtAddr(0xfffff << 47));
}
#[test]
pub fn test_align_up() {
assert_eq!(align_up(0, 1), 0);
assert_eq!(align_up(1234, 1), 1234);
assert_eq!(align_up(0xffff_ffff_ffff_ffff, 1), 0xffff_ffff_ffff_ffff);
assert_eq!(align_up(0, 2), 0);
assert_eq!(align_up(1233, 2), 1234);
assert_eq!(align_up(0xffff_ffff_ffff_fffe, 2), 0xffff_ffff_ffff_fffe);
assert_eq!(align_up(0, 128), 0);
assert_eq!(align_up(0, 1), 0);
assert_eq!(align_up(0, 2), 0);
assert_eq!(align_up(0, 0x8000_0000_0000_0000), 0);
}
}