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CHANGELOG.md

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Changelog

Unreleased

New features

  • MapError now implements core::error::Error.

0.8.0

Breaking changes

  • Updated to zerocopy 0.8.2.

New features

  • Added mair module with types to build MAIR values.
  • Implemented Default for Attributes, Descriptor, PageTable, PhysicalAddress and VirtualAddress. Added associated EMPTY constant for Descriptor and PageTable.

0.7.1

New features

  • Added Mapping::translation method.
  • Added Mapping::size, IdMap::size and LinearMap::size methods.
  • Derived zerocopy traits for VirtualAddress, PhysicalAddress, PageTable and Descriptor. This is guarded behind the zerocopy feature so the dependency can be avoided if not desired.
  • Added TargetAllocator for pregenerating a static pagetable for a target device.

0.7.0

Breaking changes

  • Translation::allocate_table and Translation::deallocate_table now takes &mut self rather than `&self.

Other changes

  • The Translation type parameter to Mapping no longer needs to be Clone.
  • IdMap, LinearMap, Mapping and RootTable are now Sync.

0.6.0

Breaking changes

  • Added support for EL2 and EL3 page tables. This requires a new parameter to IdMap::new, LinearMap::new, Mapping::new and RootTable::new.
  • Attributes::EXECUTE_NEVER renamed to Attributes::UXN.
  • Attributes::DEVICE_NGNRE and NORMAL have been removed in favour of ATTRIBUTE_INDEX_*, OUTER_SHAREABLE and INNER_SHAREABLE, to avoid making assumptions about how the MAIR registers are programmed.

New features

  • Added root_address, mark_active and mark_inactive methods to IdMap, LinearMap and Mapping. These may be used to activate and deactivate the page table manually rather than calling activate and deactivate.
  • Added NS and PXN bits to Attributes.

Bug fixes

  • When an invalid descriptor is split into a table, the table descriptors aren't set unless to non-zero values unless the original descriptor was.

Other changes

  • Attributes::ACCESSED is no longer automatically set on all new mappings. To maintain existing behaviour you should explicitly set Attributes::ACCESSED whenever calling map_range for a valid mapping.

0.5.0

Bug fixes

  • Reject the PAGE_OR_TABLE flag when passed to map_range, which would result in corrupt table mappings to be created.

Breaking changes

  • Updated modify_range to split block entries before traversing them, and pass only the descriptors and subregions that are completely covered by the given region to the updater callback function.
  • Updated modify_range to only pass block or page descriptors to the callback function and prevent them from being converted into table descriptors inadvertently.
  • Added rigid break-before-make (BBM) checks to map_range and modify_range.
  • Marked activate and deactivate methods as unsafe.

New features

  • Added new map_range() alternative map_range_with_constraints() with extra contraints argument.
  • Added walk_range method that iterates over all block or page descriptorsthat intersect with a given region, without permitting the callback to make changes to the descriptors

0.4.1

Bug fixes

  • RootTable, Mapping, IdMap and LinearMap are now correctly marked as Send, as it doesn't matter where they are used from.

0.4.0

Breaking changes

  • Updated bitflags to 2.0.2, which changes the API of Attributes a bit.
  • Updated map_range method to support mapping leaf page table entries without the VALID flag. Attributes::VALID is no longer implicitly set when mapping leaf page table entries.

New features

  • Added modify_range method to IdMap, LinearMap and Mapping to update details of a mapped range. This can be used e.g. to change flags for some range which is already mapped. As part of this, the Descriptor struct was added to the public API.
  • Added DBM and software flags to Attributes.

0.3.0

Breaking changes

  • Made Translation trait responsible for allocating page tables. This should help make it possible to use more complex mapping schemes, and to construct page tables in a different context to where they are used.
  • Renamed AddressRangeError to MapError, which is now an enum with three variants and implements Display.
  • From<*const T> and From<*mut T> are no longer implemented for VirtualAddress.
  • Added support for using TTBR1 as well as TTBR0; this changes various constructors to take an extra parameter.

New features

  • Made alloc dependency optional via a feature flag.
  • Added support for linear mappings with new LinearMap.
  • Implemented subtraction of usize from address types.

Bugfixes

  • Fixed memory leak introduced in 0.2.0: dropping a page table will now actually free its memory.

0.2.1

New features

  • Implemented Debug and Display for MemoryRegion.
  • Implemented From<Range<VirtualAddress>> for MemoryRegion.
  • Implemented arithmetic operations for PhysicalAddress and VirtualAddress.

0.2.0

Breaking changes

  • Added bounds check to IdMap::map_range; it will now return an error if you attempt to map a virtual address outside the range of the page table given its configured root level.

New features

  • Implemented Debug for PhysicalAddress and VirtualAddress.
  • Validate that chosen root level is supported.

Bugfixes

  • Fixed bug in Display and Drop implementation for RootTable that would result in a crash for any pagetable with non-zero mappings.
  • Fixed Display implementation for PhysicalAddress and VirtualAddress to use correct number of digits.

0.1.0

Initial release.