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Prepare aarch32-rt 0.5 with SMP support #211

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4bb7eb0
Prepare aarch32-rt 0.5 with SMP support
jonathanpallant Aug 3, 2026
cc260ce
Re-word CHANGELOG entries
jonathanpallant Aug 25, 2026
ae1e140
Trim whitespace
jonathanpallant Aug 25, 2026
d68110e
Improve comments for new functions
jonathanpallant Aug 25, 2026
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7 changes: 6 additions & 1 deletion aarch32-rt-macros/CHANGELOG.md
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Expand Up @@ -10,6 +10,10 @@ As of *aarch32-rt-macros v0.1.0*, this project is released in lock-step with

## [Unreleased]

## [aarch32-rt-macros v0.5.0]

- No changes

## [aarch32-rt-macros v0.4.0]

- Increased MSRV to 1.93
Expand Down Expand Up @@ -37,7 +41,8 @@ As of *aarch32-rt-macros v0.1.0*, this project is released in lock-step with

Initial release

[Unreleased]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.4.0...HEAD
[Unreleased]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.5.0...HEAD
[aarch32-rt-macros v0.5.0]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.4.0...aarch32-rt-v0.5.0
[aarch32-rt-macros v0.4.0]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.3.0...aarch32-rt-v0.4.0
[aarch32-rt-macros v0.3.0]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.2.0...aarch32-rt-v0.3.0
[aarch32-rt-macros v0.2.0]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.1.0...aarch32-rt-v0.2.0
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2 changes: 1 addition & 1 deletion aarch32-rt-macros/Cargo.toml
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Expand Up @@ -12,7 +12,7 @@ readme = "README.md"
repository = "https://github.com/rust-embedded/aarch32.git"
homepage = "https://github.com/rust-embedded/aarch32"
rust-version = "1.93"
version = "0.4.0"
version = "0.5.0"

[lib]
proc-macro = true
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19 changes: 18 additions & 1 deletion aarch32-rt/CHANGELOG.md
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Expand Up @@ -7,6 +7,22 @@ and this project adheres to [Semantic Versioning](http://semver.org/).

## [Unreleased]

## [aarch32-rt v0.5.0]

### Added

- Improved SMP support on ARMv7-A, ARMv7-R and ARMv8-R:
- you now only have to supply a `_asm_secondary_core_park` function to
park/release any secondary cores (such cores enter a WFE loop by default)
- New exported symbol `_asm_core_start`
- New exported symbol `_default_kmain_secondary`
- New exported symbol `_asm_default_secondary_core_park`

### Changed

- Renamed exported symbol `_stack_setup_preallocated` to `_asm_stack_setup_preallocated`
- Renamed exported symbol `_init_segments` to `_asm_init_segments`

## [aarch32-rt v0.4.0]

### Added
Expand Down Expand Up @@ -86,7 +102,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).

Initial release

[Unreleased]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.4.0...HEAD
[Unreleased]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.5.0...HEAD
[aarch32-rt v0.5.0]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.4.0...aarch32-rt-v0.5.0
[aarch32-rt v0.4.0]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.3.0...aarch32-rt-v0.4.0
[aarch32-rt v0.3.0]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.2.0...aarch32-rt-v0.3.0
[aarch32-rt v0.2.0]: https://github.com/rust-embedded/aarch32/compare/aarch32-rt-v0.1.0...aarch32-rt-v0.2.0
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4 changes: 2 additions & 2 deletions aarch32-rt/Cargo.toml
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Expand Up @@ -21,11 +21,11 @@ name = "aarch32-rt"
readme = "README.md"
repository = "https://github.com/rust-embedded/aarch32.git"
rust-version = "1.93"
version = "0.4.0"
version = "0.5.0"

[dependencies]
aarch32-cpu = { version = "0.4.0", path = "../aarch32-cpu" }
aarch32-rt-macros = { path = "../aarch32-rt-macros", version = "=0.4.0" }
aarch32-rt-macros = { path = "../aarch32-rt-macros", version = "=0.5.0" }

[features]
# Enable the FPU on start-up, even on a soft-float EABI target
Expand Down
10 changes: 8 additions & 2 deletions aarch32-rt/src/lib.rs
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Expand Up @@ -539,7 +539,7 @@
//! // Wait until Core 0 does a 'sev'
//! wfe
//! // Spin until register is non-zero.
//! ldr r1, [r0]
//! ldr r1, [r0]
//! cmp r1, 0
//! beq 1b
//! // return to start-up
Expand Down Expand Up @@ -844,6 +844,10 @@ core::arch::global_asm!(
);

/// Spins secondary cores.
///
/// This function is exported so the linker can use it as a default
/// implementation of `kmain_secondary`, but it's considered an internal API
/// that we don't expect you to call.
#[unsafe(no_mangle)]
#[cfg(target_arch = "arm")]
pub extern "C" fn _default_kmain_secondary() {
Expand All @@ -859,7 +863,9 @@ pub extern "C" fn _default_kmain_secondary() {

// # _asm_stack_setup_preallocated
//
// Configure a stack for every mode. Leaves you in sys mode.
// Configure a stack for every mode using linker provided constants.
//
// Leaves you in SYS mode at the end.
//
// Pass the core number in r0
#[cfg(target_arch = "arm")]
Expand Down