How can I shared a FPU between two Rocket cores？

[leizhangpku]

Type of issue: bug report | feature request | other enhancement

Impact: no functional change | API addition (no impact on existing code) | API modification | unknown

Development Phase: request | proposal

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[hyf6661669]

I think maybe you could use FPU as a peripheral. The instructions which need to use FPU should send a "req" to it, which means you need to implement an arbiter.