riscv: add CSR-defining macros

Adds helper macros for defining CSR types.

riscv/CHANGELOG.md

@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Export `riscv::register::macros` module macros for external use
 - Add `riscv::register::mcountinhibit` module for `mcountinhibit` CSR
 - Add `Mcounteren` in-memory update functions 
+- Add CSR-defining macros to create in-memory types
 
 ### Fixed
 

riscv/src/lib.rs

@@ -36,7 +36,7 @@
 #![allow(clippy::missing_safety_doc)]
 
 pub mod asm;
-pub(crate) mod bits;
+pub mod bits;
 pub mod delay;
 pub mod interrupt;
 pub mod register;

riscv/src/register.rs

@@ -107,6 +107,9 @@ pub mod minstreth;
 mod mhpmeventx;
 pub use self::mhpmeventx::*;
 
+#[cfg(test)]
+mod tests;
+
 // TODO: Debug/Trace Registers (shared with Debug Mode)
 
 // TODO: Debug Mode Registers