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+# r-efi - UEFI Reference Specification Protocol Constants and Definitions
+
+## CHANGES WITH 4.2.0:
+
+        * Bump required compiler version to: rust-1.68
+
+        * New Protocols: debugport, debug-support, driver-diagnostics2,
+                         mp-services, shell, shell-dynamic-command,
+                         shell-parameters, udp-4, udp-6
+
+        * Use const-generics instead of ZSTs to represent dynamic trailing
+          members in C structs.
+
+        * The `examples` feature has been renamed to `native` (a backwards
+          compatible feature is left in place).
+
+        * Add support for riscv64.
+
+        * Use the official rust `efiapi` calling convention. This was
+          stabilized with rust-1.68.
+
+        Contributions from: Ayush Singh, David Rheinsberg, Rob Bradford
+
+        - Dußlingen, 2023-03-20
+
+## CHANGES WITH 4.1.0:
+
+        * New Protocols: device-path-{from,to}-text, ip4, ip6, managed-network,
+                         rng, service-binding, tcp4, tcp6, timestamp
+
+        * `ImageEntryPoint` is now correctly annotated as `eficall`.
+
+        * `Time` now derives `Default`.
+
+        * Fix nullable function pointers to use `Option<fn ...>`.
+
+        * Function prototypes now have an explicit type definition and can be
+          used independent of their protocol definition.
+
+        * The new `rust-dep-of-std` feature option allows pulling in r-efi
+          into the rust standard library. It prepares the crate workspace to
+          be suitable for the standard library. It has no use outside of this.
+
+        * Adopt the MIT license as 3rd licensing option to allow for
+          integration into the rust compiler and ecosystem.
+
+        Contributions from: Ayush Singh, David Rheinsberg, Joe Richey
+
+        - Tübingen, 2022-08-23
+
+## CHANGES WITH 4.0.0:
+
+        * Convert all enums to constants with type-aliases. This is an API
+          break, but it is needed for spec-compliance. With the old enums, one
+          couldn't encode all the possible values defined by the spec.
+          Especially, the vendor-reserved ranges were unable to be encoded in
+          a safe manner. Also see commit 401a91901e860 for a detailed
+          discussion.
+          API users likely need to convert their CamelCase enum usage to the
+          new UPPER_CASE constants.
+
+        * Convert all incomplete types to empty arrays. This affects all
+          structures that use trailing unbound arrays. These are actually ABI
+          incompatible with UEFI, since rust represents raw-pointers to such
+          types as fat-pointers. Such arrays have now been converted to empty
+          arrays, which should still allow accessing the memory location and
+          retaining structure properties, but avoids fat-pointers.
+          This is an API break, so you might have to adjust your accessors of
+          those trailing structure members.
+
+        * Implement `Clone` and `Copy` for most basic structures. Since these
+          are used as plain carriers, no higher clone/copy logic is needed. It
+          should be clear from the project-description, that only basic UEFI
+          compatibility is provided.
+
+        * Add the console-control vendor protocol. This protocol allows
+          controlling console properties. It is not part of the UEFI
+          specification, but rather defined by the TianoCore project.
+
+        * Add a new example showing how to use the GOP functions to query the
+          active graphics device.
+
+        Contributions from: David Rheinsberg, GGRei, Hiroki Tokunaga,
+                            Richard Wiedenhöft
+
+        - Tübingen, 2021-06-23
+
+## CHANGES WITH 3.2.0:
+
+        * Add new protocols: DiskIo, DiskIo2, BlockIo, DriverBinding
+
+        * Extend the Device-Path payload structure and add the HardDriveMedia
+          payload.
+
+        * Add HII definitions: A new top-level module `hii` with all the basic
+          HII constants, as well as a handful of HII protocols (hii_database,
+          hii_font, hii_string)
+
+        * Document new `-Zbuild-std` based cross-compilation, serving as
+          official rust alternative to cargo-xbuild.
+
+        Contributions from: Alex James, Bret Barkelew, David Rheinsberg,
+                            Michael Kubacki
+
+        - Tübingen, 2020-10-23
+
+## CHANGES WITH 3.1.0:
+
+        * Add the basic networking types to `r_efi::base`. This includes MAC
+          and IP address types.
+
+        * Add the EFI_SIMPLE_NETWORK_PROTOCOL definitions and all required
+          constants to make basic networking available.
+
+        * Add a new uefi-cross example, which is copied from upstream rustc
+          sources, so we can test local modifications to it.
+
+        Contributions from: Alex James, David Rheinsberg
+
+        - Tübingen, 2020-09-10
+
+## CHANGES WITH 3.0.0:
+
+        * Fix a missing parameter in `BootServices::locate_device_path()`. The
+          prototype incorrectly had 2 arguments, while the official version
+          takes 3. The final `handle` argument was missing.
+          This is an API break in `r-efi`. It should have a limited impact,
+          since the function was mostly useless without a handle.
+          Thanks to Michael Kubacki for catching this!
+
+        * Adjust the `device_path` parameter in a bunch of `BootServices`
+          calls. This used to take a `*mut c_void` parameter, since the device
+          path protocol was not implemented.
+          Since we have to bump the major version anyway, we use this to also
+          fix these argument-types to the correct device-path protocol type,
+          which has been implemented some time ago.
+
+        Contributions from: David Rheinsberg, Michael Kubacki
+
+        - Tübingen, 2020-04-24
+
+## CHANGES WITH 2.2.0:
+
+        * Provide `as_usize()` accessor for `efi::Status` types. This allows
+          accessing the raw underlying value of a status object.
+
+        * The project moved to its new home at: github.com/r-efi/r-efi
+
+        Contributions from: David Rheinsberg, Joe Richey
+
+        - Tübingen, 2020-04-16
+
+## CHANGES WITH 2.1.0:
+
+        * Add the graphics-output-protocol.
+
+        * Expose reserved fields in open structures, otherwise they cannot be
+          instantiated from outside the crate itself.
+
+        Contributions from: David Herrmann, Richard Wiedenhöft, Rob Bradford
+
+        - Tübingen, 2019-03-20
+
+## CHANGES WITH 2.0.0:
+
+        * Add a set of UEFI protocols, including simple-text-input,
+          file-protocol, simple-file-system, device-path, and more.
+
+        * Fix signature of `BootServices::allocate_pages`.
+
+        Contributions from: David Rheinsberg, Richard Wiedenhöft, Tom Gundersen
+
+        - Tübingen, 2019-03-01
+
+## CHANGES WITH 1.0.0:
+
+        * Enhance the basic UEFI type integration with the rust ecosystem. Add
+          `Debug`, `Eq`, `Ord`, ... derivations, provide converters to/from the
+          core library, and document the internal workings.
+
+        * Fix `Boolean` to use `newtype(u8)` to make it ABI compatible to UEFI.
+          This now accepts any byte value that UEFI accetps without any
+          conversion required.
+
+        Contributions from: Boris-Chengbiao Zhou, David Rheinsberg, Tom
+                            Gundersen
+
+        - Tübingen, 2019-02-14
+
+## CHANGES WITH 0.1.1:
+
+        * Feature gate examples to make `cargo test` work on non-UEFI systems
+          like CI.
+
+        Contributions from: David Herrmann
+
+        - Tübingen, 2018-12-10
+
+## CHANGES WITH 0.1.0:
+
+        * Initial release of r-efi.
+
+        Contributions from: David Herrmann
+
+        - Tübingen, 2018-12-10