Simplify CSR field definitions and cycle sync

[jserv]

This refactors mstatus/sstatus register field definitions:

• Use anonymous enum for true compile-time constants (usable in switch cases, array sizes, static assertions)
• Eliminate SSTATUS duplication by aliasing to MSTATUS values
• Use unsigned literals (1U) to prevent sign-bit shift issues

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Summary by cubic

Simplified CSR field definitions and centralized cycle/time CSR sync to reduce duplication and ensure correct timer behavior on TIME CSR reads.

• Refactors

  • Replaced mstatus macros with an anonymous enum for true compile-time constants.
  • Aliased sstatus fields to mstatus to remove duplicate definitions.
  • Extracted cycle/time CSR syncing into csr_sync_cycle and used it in CSRRW/CSRRS/CSRRC.

• Bug Fixes

  • Used unsigned masks (1U) to prevent sign-bit shift issues in bit operations.

^{Written for commit 50a75ef. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

[jserv]

Benchmarks

Details

Benchmark suite	Current: 50a75ef	Previous: df9727a	Ratio
Dhrystone	1624 DMIPS	1593.333 DMIPS	0.98
CoreMark	950.045 iterations/sec	947.117 iterations/sec	1.00

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