- Provide proper pre_ithread/post_ithread functions for both     hard and soft interrupts - Do not handle masked interrupts - Do not write Cause register because most bytes are read-only and     writing the same byte to RW fields are pointless. And in case of     software interrupt utterly wrong
- Provide proper pre_ithread/post_ithread functions for both
    hard and soft interrupts
- Do not handle masked interrupts
- Do not write Cause register because most bytes are read-only and
    writing the same byte to RW fields are pointless. And in case of
    software interrupt utterly wrong

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