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# Changelog
## 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.
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