Initial Rust CMSE support

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

Signed-off-by: Hugues de Valon <hugues.devalon@arm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index f8b5606..beaecd2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -57,6 +57,8 @@ extern crate volatile_register;
 mod macros;
 
 pub mod asm;
+#[cfg(armv8m)]
+pub mod cmse;
 pub mod interrupt;
 #[cfg(not(armv6m))]
 pub mod itm;