Merge #189

189: Initial Rust CMSE support r=thejpster a=hug-dev

Armv8-M and Armv8.1-M architecture profiles have an optional Security Extension which provides a set of Security features.
This patch adds initial support of the Cortex-M Security Extensions but providing support for the TT intrinsics and helper functions on top of it in the newly added `cmse` module of this crate.
The code is a Rust idiomatic implementation of the C requirements described in this document: https://developer.arm.com/docs/ecm0359818/latest

Executed `assemble.sh` to generate the new static libraries containing the `TT*` instructions. Tested `check_blobs.sh` locally and it passed.
Tested on QEMU using the `mps2-an505` machine.

Co-authored-by: Hugues de Valon <hugues.devalon@arm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index f8b5606..276551c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -34,6 +34,8 @@
 #![no_std]
 #![allow(clippy::identity_op)]
 #![allow(clippy::missing_safety_doc)]
+// Prevent clippy from complaining about empty match expression that are used for cfg gating.
+#![allow(clippy::match_single_binding)]
 
 // This makes clippy warn about public functions which are not #[inline].
 //
@@ -57,6 +59,8 @@ extern crate volatile_register;
 mod macros;
 
 pub mod asm;
+#[cfg(armv8m)]
+pub mod cmse;
 pub mod interrupt;
 #[cfg(not(armv6m))]
 pub mod itm;