Fix Comments on user accesses: cycle.rs, cycleh.rs, instret.rs, and instreth.rs

Reformat mod.rs

Update hpm method to use an index from enum

Move mcounteren macros outside of Mcounteren type declaration

Author: dkhayes117

src/register/cycle.rs

@@ -1,6 +1,7 @@
 //! cycle register
-//! Shadow of mcycle register that can be read in user mode
-//! must have mcounteren::cy bit enabled for user mode access
+//! Shadow of mcycle register
+//! must have mcounteren::cy bit enabled for use in supervisor mode (if implemented)
+//! if supervisor mode is not implemented this register will control user mode access
 
 read_csr_as_usize!(0xC00, __read_cycle);
 read_composite_csr!(super::cycleh::read(), read());

src/register/cycleh.rs

@@ -1,5 +1,6 @@
 //! cycleh register
-//! Shadow of mcycleh register that can be read in user mode
-//! must have mcounteren::cy bit enabled for user mode access
+//! Shadow of mcycleh register (rv32)
+//! must have mcounteren::cy bit enabled for use in supervisor mode (if implemented)
+//! if supervisor mode is not implemented this register will control user mode access
 
 read_csr_as_usize_rv32!(0xC80, __read_cycleh);

src/register/instret.rs

@@ -1,6 +1,7 @@
 //! instret register
-//! shadow of minstret register for user mode
-//! mcounteren::ir must be enabled to use in user mode
+//! Shadow of minstret register
+//! must have mcounteren::ir bit enabled for use in supervisor mode (if implemented)
+//! if supervisor mode is not implemented this register will control user mode access
 
 read_csr_as_usize!(0xC02, __read_instret);
 read_composite_csr!(super::instreth::read(), read());

src/register/instreth.rs

@@ -1,5 +1,6 @@
 //! instreth register
-//! shadow of minstreth register for user mode
-//! mcounteren::ir must be enabled to use in user mode
+//! Shadow of minstreth register (rv32)
+//! must have mcounteren::ir bit enabled for use in supervisor mode (if implemented)
+//! if supervisor mode is not implemented this register will control user mode access
 
 read_csr_as_usize!(0xC82, __read_instreth);