Upgrade rust edition, remove cbindgen

[thomasw04]

Upgrades the rust edition to 2024. Implements the first two points of #21.

[Copilot]

Pull Request Overview

Upgrades the Rust edition to 2024 and removes cbindgen, updating exported symbols and unsafe pointer usage as required.

• Changed #[no_mangle] attributes to #[unsafe(no_mangle)] in exported functions.
• Wrapped calls requiring unsafe behavior in explicit unsafe blocks.
• Removed the cbindgen generation in build.rs and updated the public API header accordingly.

Reviewed Changes

Copilot reviewed 13 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
kernel/src/syscalls/tasks.rs	Updated syscall attribute for reschedule syscall.
kernel/src/syscalls/dummy.rs	Updated syscall attribute for dummy syscall.
kernel/src/sched/scheduler.rs	Updated syscall attributes for scheduler functions.
kernel/src/mem/pool.rs	Added an unsafe block for NonZeroUsize creation.
kernel/src/mem/boxed.rs	Reordered imports; no functional changes.
kernel/src/mem/alloc.rs	Wrapped pointer arithmetic and writes in unsafe blocks.
kernel/src/mem.rs	Wrapped allocator.free call in an unsafe block.
kernel/src/lib.rs	Updated kernel initialization function with unsafe block.
kernel/macros/Cargo.toml	Upgraded dependency versions.
kernel/include/kernel/lib.h	Removed syscall declarations in line with cbindgen removal.
kernel/build.rs	Eliminated cbindgen generation; now using direct syscall map generation.

Files not reviewed (3)

• .devcontainer/Dockerfile: Language not supported
• hal/stm32l4: Language not supported
• kernel/Cargo.toml.in: Language not supported

Comments suppressed due to low confidence (5)

kernel/src/syscalls/tasks.rs:12

• Verify that the custom attribute #[unsafe(no_mangle)] is correctly handled by the toolchain and does not affect symbol export or linking.

#[unsafe(no_mangle)]

kernel/src/syscalls/dummy.rs:5

• Ensure that changing #[no_mangle] to #[unsafe(no_mangle)] for the dummy syscall is compatible with the rest of the system and intended symbol visibility.

#[unsafe(no_mangle)]

kernel/src/sched/scheduler.rs:183

• Confirm that applying #[unsafe(no_mangle)] to exported scheduler functions does not interfere with expected external linkage or runtime behavior.

#[unsafe(no_mangle)]

kernel/include/kernel/lib.h:59

• The removal of syscall declarations in the header is intentional with cbindgen removal; please ensure that any external consumers no longer rely on these declarations.

void syscall_dummy(const void *svc_args);

kernel/src/mem/alloc.rs:155

• Review the unsafe pointer arithmetic here to ensure that the offset calculation remains correct and memory safety is maintained.

unsafe { ptr.byte_add(size_of::<BestFitMeta>() + Self::align_up()) }

[github-actions]

LCOV of commit 99b3323 during Osiris CI #128

This pull request changes total coverage 0.00% (3.73% -> 3.73%) for this diff

Summary coverage rate:
  lines......: 3.7% (80 of 2146 lines)
  functions..: 0.2% (1 of 441 functions)
  branches...: no data found

Files changed coverage rate: n/a