- Keep interrupts mask intact by RESTORE_CPU in MipsKernGenException     trap() function re-enables interrupts if exception happened with     interrupts enabled and therefor status register might be modified     by interrupt filters
- Keep interrupts mask intact by RESTORE_CPU in MipsKernGenException
    trap() function re-enables interrupts if exception happened with
    interrupts enabled and therefor status register might be modified
    by interrupt filters

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