Merge pull request #282 from rust-osdev/next

This Month in Rust OSDev: June 2026

Author: phil-opp

content/this-month/2026-06/index.md

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+title = "This Month in Rust OSDev: June 2026"
+date = 2026-07-07
+
+[extra]
+month = "June 2026"
+editors = ["phil-opp"]
++++
+
+Welcome to a new issue of _"This Month in Rust OSDev"_. In these posts, we give a regular overview of notable changes in the Rust operating system development ecosystem.
+
+<!-- more -->
+
+This series is openly developed [on GitHub](https://github.com/rust-osdev/homepage/). Feel free to open pull requests there with content you would like to see in the next issue. If you find some issues on this page, please report them by [creating an issue](https://github.com/rust-osdev/homepage/issues/new) or using our <a href="#comment-form">_comment form_</a> at the bottom of this page.
+
+Please submit interesting posts and projects for the next issue [on Zulip](https://rust-osdev.zulipchat.com/#narrow/channel/435142-newsletter/topic/Content.20suggestions/with/580172810) or via a PR [on GitHub](https://github.com/rust-osdev/homepage/).
+
+<span class="gray">
+Disclaimer: Automated scripts and AI assistance were used for collecting and categorizing links.
+Everything was proofread and checked manually, with many manual tweaks.
+</span>
+
+
+<!--
+    This is a draft for the upcoming "This Month in Rust OSDev (June 2026)" post.
+    Feel free to create pull requests against the `next` branch to add your
+    content here.
+    Please take a look at the past posts on https://rust-osdev.com/ to see the
+    general structure of these posts.
+-->
+
+## Announcements, News, and Blog Posts
+
+Here we collect news, blog posts, etc. related to OS development in Rust.
+
+<!--
+Please follow this template:
+
+- [Title](https://example.com)
+  - (optional) Some additional context
+-->
+- [Announcing Asterinas 0.18.0](https://asterinas.github.io/2026/06/04/announcing-asterinas-0.18.0.html)
+- [This Month in Redox - May 2026](https://www.redox-os.org/news/this-month-260531/)
+  - The latest Redox update covers an EEVDF scheduler, page flipping and plane support in the Intel graphics driver, a COSMIC monitor and XFCE port, and large I/O and RedoxFS performance improvements.
+- [Zinnia](https://zinnia-os.org/)
+  - A Unix-like kernel written almost entirely in Rust that boots on real x86_64 hardware and can run Wayland/X11 desktop sessions (Weston, XFCE). Drivers are loaded as modular Rust ELF libraries at boot.
+- [LearnixOS](https://www.learnix-os.com/)
+  - A book that teaches OS development from scratch in Rust, covering memory allocators, paging, filesystems, and kernel logic.
+- [Hardware Is Asynchronous. Most of Our Operating Systems Still Aren't.](https://vorjdux.com/articles/hardware-is-async.html)
+  - An article arguing that operating systems should treat asynchrony as the default rather than layering it on top of blocking abstractions, drawing on work from [CharlotteOS](https://github.com/charlotte-os/charlotte-os), an experimental modern OS written in Rust.
+- [Building an AsyncIO executor for the 3DS (pt 1!)](https://blog.cat-girl.gay/3ds-async-part-one/)
+  - Building a from-scratch async I/O executor for the Nintendo 3DS.
+
+
+## Infrastructure and Tooling
+
+In this section, we collect recent updates to `rustc`, `cargo`, and other tooling that are relevant to Rust OS development.
+
+<!--
+    Please use the following template:
+
+- [Title](https://example.com)
+  - (optional) Some additional context
+-->
+
+- [Move `std::io::Error` into `core`](https://github.com/rust-lang/rust/pull/155625)
+  - Makes I/O error handling available in `no_std`
+  - Now the rest of `std::io` can be moved to `core`/`alloc` too, including the `Read` and `Write` traits. See the [open PR](https://github.com/rust-lang/rust/pull/156527) and the [tracking issue](https://github.com/rust-lang/rust/issues/154046) for details.
+- [Stabilize `int_format_into` feature](https://github.com/rust-lang/rust/pull/152544)
+  - Formats integers into fixed-size buffers with no allocation.
+- [Stabilize `#![feature(box_as_ptr)]`](https://github.com/rust-lang/rust/pull/157876)
+  - Stabilizes `Box::as_ptr` and `Box::as_mut_ptr`
+  - These methods can be used to create multiple pointers to the same `Box` that don't invalidate each other.
+- [staticlib: hide internal symbols](https://github.com/rust-lang/rust/pull/155338)
+  - A new `-Zstaticlib-hide-internal-symbols` flag hides non-exported Rust symbols in static libraries, shrinking binaries by 5–12% in non-LTO builds.
+- [`asm!` support for the Xtensa architecture](https://github.com/rust-lang/rust/pull/147302)
+  - Inline assembly for Xtensa (ESP32 and related chips) lands in-tree after years in the esp-rs fork.
+
+## `rust-osdev` Projects
+
+In this section, we give an overview of notable changes to the projects hosted under the [`rust-osdev`](https://github.com/rust-osdev/about) organization.
+
+<!--
+    Please use the following template:
+
+    ### [`repo_name`](https://github.com/rust-osdev/repo_name)
+    <span class="maintainers">Maintained by [@maintainer_1](https://github.com/maintainer_1)</span>
+
+    The `repo_name` crate ...<<short introduction>>...
+
+    We merged the following changes this month:
+    <<changelog, either in list or text form>>
+-->
+
+### [`uefi-rs`](https://github.com/rust-osdev/uefi-rs)
+<span class="maintainers">Maintained by [@GabrielMajeri](https://github.com/GabrielMajeri), [@nicholasbishop](https://github.com/nicholasbishop), and [@phip1611](https://github.com/phip1611)</span>
+
+`uefi` makes it easy to develop Rust software that leverages safe, convenient,
+and performant abstractions for UEFI functionality.
+
+We merged the following PRs this month:
+
+- [Feat: IoMmu protocol](https://github.com/rust-osdev/uefi-rs/pull/1728)
+- [uefi: Add PciRootBridgeIo memory and I/O space access](https://github.com/rust-osdev/uefi-rs/pull/1958)
+- [uefi: Add PciRootBridgeIo attribute manipulation](https://github.com/rust-osdev/uefi-rs/pull/1965)
+- [uefi-raw: Add PciRootBridgeIoProtocolAttributes](https://github.com/rust-osdev/uefi-rs/pull/1957)
+- [uefi: Add integration with `time` crate](https://github.com/rust-osdev/uefi-rs/pull/1955)
+- [uefi: Add integration with `jiff` crate](https://github.com/rust-osdev/uefi-rs/pull/1956)
+- [uefi: remove deprecated APIs](https://github.com/rust-osdev/uefi-rs/pull/1966)
+- [uefi-raw: enhance Boolean type and make it more type safe](https://github.com/rust-osdev/uefi-rs/pull/1974)
+- [uefi-raw: various spec fixes](https://github.com/rust-osdev/uefi-rs/pull/1962)
+- [uefi: Fix `boot::exit` signature](https://github.com/rust-osdev/uefi-rs/pull/1959)
+- [uefi: reject undersized device path nodes](https://github.com/rust-osdev/uefi-rs/pull/1979)
+- [uefi: various smaller memory map related fixes and improvements](https://github.com/rust-osdev/uefi-rs/pull/1980)
+- [uefi-raw: format negative time zones correctly](https://github.com/rust-osdev/uefi-rs/pull/1982)
+- [release: uefi-raw-0.15.0, uefi-0.38.0](https://github.com/rust-osdev/uefi-rs/pull/1984)
+
+<!-- - [chore(deps): update crate-ci/typos action to v1.47.2](https://github.com/rust-osdev/uefi-rs/pull/1961) -->
+<!-- - [chore(deps): update codecov/codecov-action action to v6.0.2](https://github.com/rust-osdev/uefi-rs/pull/1960) -->
+<!-- - [nix: simplify nix code & update](https://github.com/rust-osdev/uefi-rs/pull/1963) -->
+<!-- - [uefi-raw: fix typo in PciRootBridgeIoProtocolAttributes](https://github.com/rust-osdev/uefi-rs/pull/1964) -->
+<!-- - [ci: update QEMU for windows runners](https://github.com/rust-osdev/uefi-rs/pull/1969) -->
+<!-- - [treewide: allow() -> expect() + remove unneeded allow()](https://github.com/rust-osdev/uefi-rs/pull/1968) -->
+<!-- - [xtask: update OVMF from EDK2-STABLE202502 to EDK2-STABLE202605](https://github.com/rust-osdev/uefi-rs/pull/1970) -->
+<!-- - [ci: use ubuntu-26.04 (to update QEMU)](https://github.com/rust-osdev/uefi-rs/pull/1976) -->
+<!-- - [chore(deps): update rust crate time to v0.3.47 [security]](https://github.com/rust-osdev/uefi-rs/pull/1977) -->
+<!-- - [Remove duplications in `uefi` and `uefi-raw`](https://github.com/rust-osdev/uefi-rs/pull/1967) -->
+<!-- - [uefi: streamline + fix usize_from_u32()](https://github.com/rust-osdev/uefi-rs/pull/1981) -->
+<!-- - [uefi: minor improvements to device path protocol code](https://github.com/rust-osdev/uefi-rs/pull/1983) -->
+<!-- - [uefi: minor adjustments regarding previous commits](https://github.com/rust-osdev/uefi-rs/pull/1985) -->
+<!-- - [treewide: enforce safety comments](https://github.com/rust-osdev/uefi-rs/pull/1988) -->
+<!-- - [remove multilingual field from book.toml](https://github.com/rust-osdev/uefi-rs/pull/1992) -->
+
+Thanks to [@JarlEvanson](https://github.com/JarlEvanson), [@mysteriouslyseeing](https://github.com/mysteriouslyseeing), and [@PelleKrab](https://github.com/PelleKrab) for their contributions!
+
+### [`multiboot2`](https://github.com/rust-osdev/multiboot2)
+<span class="maintainers">Maintained by [@phip1611](https://github.com/phip1611)</span>
+
+_Convenient and safe parsing of Multiboot2 Boot Information (MBI) structures and
+the contained information tags. Usable in no_std environments, such as a kernel.
+An optional builder feature also allows the construction of the corresponding
+structures._
+
+We merged the following PRs this month:
+
+- [Rewrite: Add elf library for elf_sections.rs](https://github.com/rust-osdev/multiboot2/pull/292)
+- [various safety and correctness improvements](https://github.com/rust-osdev/multiboot2/pull/301)
+- [Various improvements and fixes](https://github.com/rust-osdev/multiboot2/pull/300)
+- [modernize misc stuff](https://github.com/rust-osdev/multiboot2/pull/296)
+- [elf: remove From impl](https://github.com/rust-osdev/multiboot2/pull/299)
+- [chore: prepare new workspace releases](https://github.com/rust-osdev/multiboot2/pull/302)
+
+<!-- - [build(deps): bump crate-ci/typos from 1.46.0 to 1.47.0](https://github.com/rust-osdev/multiboot2/pull/294) -->
+<!-- - [build(deps): bump crate-ci/typos from 1.47.0 to 1.47.2](https://github.com/rust-osdev/multiboot2/pull/298) -->
+<!-- - [build(deps): bump bitflags from 2.11.0 to 2.13.0](https://github.com/rust-osdev/multiboot2/pull/297) -->
+
+Thanks to [@an-owl](https://github.com/an-owl) for their contribution!
+
+### [`bootloader`](https://github.com/rust-osdev/bootloader)
+<span class="maintainers">Maintained by [@phil-opp](https://github.com/phil-opp) and [@Freax13](https://github.com/Freax13)</span>
+
+The `bootloader` crate implements a custom Rust-based bootloader for easy loading of 64-bit ELF executables. The following changes landed in early July, but we want to mention them already because they affect users building against recent Rust nightlies:
+
+- Recent Rust nightlies renamed the `x86-softfloat` target ABI to `softfloat`. This update adjusts the bootloader's custom targets accordingly, on both the latest release and the `v0.9` branch.
+  - [Change `rustc-abi` in custom targets from `x86-softfloat` to `softfloat`](https://github.com/rust-osdev/bootloader/pull/569)
+  - [(v0.9) Change `rustc-abi` in custom targets from `x86-softfloat` to `softfloat`](https://github.com/rust-osdev/bootloader/pull/568)
+- [uefi: bump from 0.20 to 0.38](https://github.com/rust-osdev/bootloader/pull/566)
+
+<!-- - [deps: bump uart_16550 to 0.6.0](https://github.com/rust-osdev/bootloader/pull/565) -->
+<!-- - [janked dependencies: bump critical-section, atomic-polyfill, heapless](https://github.com/rust-osdev/bootloader/pull/567) -->
+
+Thanks to [@phip1611](https://github.com/phip1611) for their contribution!
+
+### [`ovmf-prebuilt`](https://github.com/rust-osdev/ovmf-prebuilt)
+<span class="maintainers">Maintained by [@nicholasbishop](https://github.com/nicholasbishop) and [@phil-opp](https://github.com/phil-opp)</span>
+
+The `ovmf-prebuilt` project provides pre-built [edk2](https://github.com/tianocore/edk2) releases to make it easier to set up OVMF. We merged the following changes this month:
+
+- [Fix build errors for edk2-stable202605](https://github.com/rust-osdev/ovmf-prebuilt/pull/312)
+- [Update to sha2-0.11](https://github.com/rust-osdev/ovmf-prebuilt/pull/313)
+- [release: 0.2.9 with edk2-stable202605-r1](https://github.com/rust-osdev/ovmf-prebuilt/pull/314)
+
+<!-- - [chore(deps): lock file maintenance](https://github.com/rust-osdev/ovmf-prebuilt/pull/309) -->
+<!-- - [chore(deps): lock file maintenance](https://github.com/rust-osdev/ovmf-prebuilt/pull/310) -->
+<!-- - [chore(deps): lock file maintenance](https://github.com/rust-osdev/ovmf-prebuilt/pull/315) -->
+<!-- - [chore(deps): lock file maintenance](https://github.com/rust-osdev/ovmf-prebuilt/pull/316) -->
+<!-- - [chore(deps): lock file maintenance](https://github.com/rust-osdev/ovmf-prebuilt/pull/317) -->
+<!-- - [chore(deps): lock file maintenance](https://github.com/rust-osdev/ovmf-prebuilt/pull/320) -->
+
+### [`uart_16550`](https://github.com/rust-osdev/uart_16550)
+<span class="maintainers">Maintained by [@phip1611](https://github.com/phip1611)</span>
+
+Simple yet highly configurable low-level driver for 16550 UART devices,
+typically known and used as serial ports or COM ports.
+
+We merged the following change this month:
+
+- [lib: change signature of Uart16550::config() to be more flexible](https://github.com/rust-osdev/uart_16550/pull/61)
+
+<!-- - [build(deps): bump crate-ci/typos from 1.46.0 to 1.47.1](https://github.com/rust-osdev/uart_16550/pull/59) -->
+<!-- - [build(deps): bump bitflags from 2.11.0 to 2.12.1](https://github.com/rust-osdev/uart_16550/pull/60) -->
+
+<!--
+    x86_64 had only dependency/chore updates this month:
+    - x86_64 #590 (Bump actions/checkout from 6 to 7)
+-->
+
+## Other Projects
+
+In this section, we describe updates to Rust OS projects that are not directly related to the `rust-osdev` organization. Feel free to [create a pull request](https://github.com/rust-osdev/homepage/pulls) with the updates of your OS project for the next post.
+
+<!--
+    Please use the following template:
+
+    ### [`owner_name/repo_name`](https://github.com/rust-osdev/owner_name/repo_name)
+    <span class="maintainers">(Section written by [@your_github_name](https://github.com/your_github_name))</span>
+
+    ...<<your project updates>>...
+-->
+
+### [`mkroening/elf-symbols`](https://github.com/mkroening/elf-symbols)
+<span class="maintainers">(Section written by [@mkroening](https://github.com/mkroening))</span>
+
+When developing an OS, you often need some information about the loaded kernel image:
+
+- Where has the loader loaded the kernel to?
+- How large is the loaded kernel?
+- Where do the text segment and the data segment end?
+- How do I get the kernel TLS image?
+
+These questions can be answered by building non-relocatable images, by writing custom linker scripts, or by having a custom loader that provides this information somehow.
+
+But there is another way!
+In fact, the main ELF linkers that I am aware of ([BFD], [gold], [LLD], [mold], and [Wild]) all have built-in ELF symbols that answer these questions when not using custom linker scripts.
+Unfortunately, many are poorly documented, so I created the [elf-symbols] crate that exposes and documents them.
+All symbols are tested on the aforementioned linkers.
+The documentation shows when each linker gained support for the respective symbol.
+
+The following symbols are straightforward:
+
+- `__executable_start` (`executable_start()`) is the start of the executable.
+- `_etext` (`text_end()`) is the end of the text segment.
+- `_edata` (`data_end()`) is the end of the data segment.
+- `_end` (`executable_end()`) is the end of the executable.
+
+`__ehdr_start` (`elf_header()`) is especially interesting.
+It allows programs to examine themselves by reading their ELF headers (file headers and program headers).
+This can be used to get TLS image information, for example.
+
+Note that these symbols are ELF specific, though, so they cannot be used when linking to something else, such as a PE32+ UEFI executable.
+
+#### Examples
+
+```rust
+println!("Executable start: {:p}", elf_symbols::executable_start());
+println!("ELF header:       {:p}", elf_symbols::elf_header());
+println!("Text segment end: {:p}", elf_symbols::text_end());
+println!("Data segment end: {:p}", elf_symbols::data_end());
+println!("Executable end:   {:p}", elf_symbols::executable_end());
+```
+
+[BFD]: https://sourceware.org/git/?p=binutils-gdb.git;a=tree;f=ld;h=b1662159cdd15bb857e04e42bd26361c0d406099;hb=5e56594815854de5eca35c7c04b11705d0f19c02
+[gold]: https://sourceware.org/git/?p=binutils-gdb.git;a=tree;f=gold;h=ac6272c7bb3ad02524b2ca86a2cf9b68e9ca30ca;hb=5e56594815854de5eca35c7c04b11705d0f19c02
+[LLD]: https://github.com/llvm/llvm-project/tree/llvmorg-22.1.8/lld
+[mold]: https://github.com/rui314/mold/tree/v2.41.0
+[Wild]: https://github.com/wild-linker/wild/tree/0.9.0
+[elf-symbols]: https://crates.io/crates/elf-symbols
+
+### [`phil-opp/blog_os`](https://github.com/phil-opp/blog_os)
+<span class="maintainers">(Section written by [@phil-opp](https://github.com/phil-opp))</span>
+
+We merged the following changes to the [_Writing an OS in Rust_](https://os.phil-opp.com/) blog. These landed in early July, but we mention them here since they keep the code building on the latest Rust nightly:
+
+- [Fix target spec: use `softfloat` instead of `x86-softfloat`](https://github.com/phil-opp/blog_os/pull/1484)
+- [Fix blog: the `x86-softfloat` feature was renamed to `softfloat`](https://github.com/phil-opp/blog_os/pull/1485)
+- [Update for new Rust error messages](https://github.com/phil-opp/blog_os/pull/1486)
+- [Update blog to zola 0.22.1](https://github.com/phil-opp/blog_os/pull/1487)
+
+## Join Us?
+
+Are you interested in Rust-based operating system development? Our `rust-osdev` organization is always open to new members and new projects. Just let us know if you want to join! A good way to get in touch is our [Zulip chat](https://rust-osdev.zulipchat.com).