Update zerocopy requirement from 0.7.35 to 0.8.2 (#60)

* Update zerocopy requirement from 0.7.35 to 0.8.2

Updates the requirements on [zerocopy](https://github.com/google/zerocopy) to permit the latest version.
- [Release notes](https://github.com/google/zerocopy/releases)
- [Changelog](https://github.com/google/zerocopy/blob/main/CHANGELOG.md)
- [Commits](google/zerocopy@v0.7.35...v0.8.2)

---
updated-dependencies:
- dependency-name: zerocopy
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* Updates for new version of zerocopy.

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Andrew Walbran <[email protected]>

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Breaking changes
+
+- Updated to `zerocopy` 0.8.2.
+
 ### New features
 
 - Added `mair` module with types to build MAIR values.

Cargo.toml

@@ -14,7 +14,7 @@ categories = ["embedded", "no-std", "hardware-support"]
 
 [dependencies]
 bitflags = "2.6.0"
-zerocopy = { version = "0.7.35", features = ["derive"], optional = true }
+zerocopy = { version = "0.8.2", features = ["derive"], optional = true }
 
 [features]
 default = ["alloc", "zerocopy"]

src/paging.rs

@@ -14,7 +14,7 @@ use core::marker::PhantomData;
 use core::ops::{Add, Range, Sub};
 use core::ptr::NonNull;
 #[cfg(feature = "zerocopy")]
-use zerocopy::{AsBytes, FromBytes, FromZeroes};
+use zerocopy::{FromBytes, FromZeros, Immutable, IntoBytes, KnownLayout};
 
 const PAGE_SHIFT: usize = 12;
 
@@ -64,7 +64,10 @@ impl TranslationRegime {
 }
 
 /// An aarch64 virtual address, the input type of a stage 1 page table.
-#[cfg_attr(feature = "zerocopy", derive(AsBytes, FromBytes, FromZeroes))]
+#[cfg_attr(
+    feature = "zerocopy",
+    derive(FromBytes, Immutable, IntoBytes, KnownLayout)
+)]
 #[derive(Copy, Clone, Eq, Ord, PartialEq, PartialOrd)]
 #[repr(transparent)]
 pub struct VirtualAddress(pub usize);
@@ -111,7 +114,10 @@ pub struct MemoryRegion(Range<VirtualAddress>);
 
 /// An aarch64 physical address or intermediate physical address, the output type of a stage 1 page
 /// table.
-#[cfg_attr(feature = "zerocopy", derive(AsBytes, FromBytes, FromZeroes))]
+#[cfg_attr(
+    feature = "zerocopy",
+    derive(FromBytes, Immutable, IntoBytes, KnownLayout)
+)]
 #[derive(Copy, Clone, Eq, Ord, PartialEq, PartialOrd)]
 #[repr(transparent)]
 pub struct PhysicalAddress(pub usize);
@@ -834,7 +840,10 @@ impl<T: Translation> PageTableWithLevel<T> {
 
 /// A single level of a page table.
 #[repr(C, align(4096))]
-#[cfg_attr(feature = "zerocopy", derive(AsBytes, FromZeroes))]
+#[cfg_attr(
+    feature = "zerocopy",
+    derive(FromZeros, Immutable, IntoBytes, KnownLayout)
+)]
 pub struct PageTable {
     entries: [Descriptor; 1 << BITS_PER_LEVEL],
 }
@@ -856,7 +865,10 @@ impl PageTable {
 ///   - A page mapping, if it is in the lowest level page table.
 ///   - A block mapping, if it is not in the lowest level page table.
 ///   - A pointer to a lower level pagetable, if it is not in the lowest level page table.
-#[cfg_attr(feature = "zerocopy", derive(AsBytes, FromZeroes))]
+#[cfg_attr(
+    feature = "zerocopy",
+    derive(FromZeros, Immutable, IntoBytes, KnownLayout)
+)]
 #[derive(Clone, Copy, PartialEq, Eq)]
 #[repr(C)]
 pub struct Descriptor(usize);

src/target.rs

@@ -10,7 +10,7 @@ use crate::paging::{deallocate, PageTable, PhysicalAddress, Translation};
 use alloc::{vec, vec::Vec};
 use core::{mem::size_of, ptr::NonNull};
 #[cfg(feature = "zerocopy")]
-use zerocopy::AsBytes;
+use zerocopy::IntoBytes;
 
 /// An implementation of `Translation` which builds a static pagetable to be built into a binary for
 /// some target device.