WIP: ZicntrM covergroup

[coreyqh]

• WIP: missing all coverpoints that are specific to M mode
• Worked through with Roman, Madeleine, Marina, and Leilani
  • Roman and Madeleine working on ZicntrU
  • Marina and Leilani working on ZicntrS
  • PRs from these teams coming soon, pending review of this general structure and ability to push to github
• Coverpoints for writing mcounteren/scounteren decoupled from coverpoints for reading corresponding counters
  • Bit swizzling used to create coverpoints for reading counters with their enable bit set
  • Could be recombined using prev and current for back-to-back writes and reads. Open to feedback on whether this is more or less elegant/robust
  • Unsure of whether the walking ones should be filled with zeros or wildcards. For reading counters, it might make more sense not to care about other counters' enables

[coreyqh]

All presently implemented coverpoints migrated to ZicntrU and ZicntrS.

[davidharrishmc]

Cp_mcounteren_access_write and cp_scounteren_access_write are missing priv_mode_m in the cross

What are cp_*coutneren_access_read for? I don’t see these in the testplan. Can they be deleted?

I don’t see the coverpoints described in the testplan.