Add VTW field to hstatus; improve rules for WFI in virtual modes #523
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Add (restore) field VTW to CSR hstatus, analogous to mstatus.TW. Also, better clarify the rules for the exceptions raised by instruction WFI when in virtual operating modes (VS mode and VU mode).
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Add (restore) field VTW to CSR hstatus, analogous to mstatus.TW. Also, better clarify the rules for the exceptions raised by instruction WFI when in virtual operating modes (VS mode and VU mode).