Fix with Cargo fmt

Add scounteren.rs
Implemented set_hpm and clear_hpm functions
Removed State enum, replaced with bool
Update comments to be more concise

Author: dkhayes117

src/register/cycle.rs

@@ -1,7 +1,7 @@
 //! cycle register
 //! 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
+//! must have `scounter::cy` or `mcounteren::cy` bit enabled depending on whether
+//! S-mode is implemented or not
 
 read_csr_as_usize!(0xC00, __read_cycle);
 read_composite_csr!(super::cycleh::read(), read());

src/register/cycleh.rs

@@ -1,6 +1,6 @@
 //! cycleh register
 //! 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
+//! must have `scounter::cy` or `mcounteren::cy` bit enabled depending on whether
+//! S-mode is implemented or not
 
 read_csr_as_usize_rv32!(0xC80, __read_cycleh);

src/register/instret.rs

@@ -1,7 +1,7 @@
 //! instret register
 //! 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
+//! must have `scounter::ir` or `mcounteren::ir` bit enabled depending on whether
+//! S-mode is implemented or not
 
 read_csr_as_usize!(0xC02, __read_instret);
 read_composite_csr!(super::instreth::read(), read());

src/register/instreth.rs

@@ -1,6 +1,6 @@
 //! instreth register
 //! 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
+//! must have `scounter::ir` or `mcounteren::ir` bit enabled depending on whether
+//! S-mode is implemented or not
 
 read_csr_as_usize!(0xC82, __read_instreth);