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MPIE and MPP update when returning from interrupt with MRET

Anne MERLANDE
 

Hello

The privileged architecture says that when returning from interrupt with MRET, MPIE is set to 1 (and MPP is set to U).
What is the rational behind ? Is it still in the context of supporting nested traps ? In case of an implementation with 2 privileged modes but no N extension is it still necessary ?

Thanks for your help
Anne
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