Custom instruction for RISC V

[PriyamvadAcharya]

Hello Nitish it was a great tutorial but i have certain questions.

1. In temp.h file
   #define MATCH_MOD 0x200006b
   #define MASK_MOD 0xfe00707f

What are these two hexadecimal value i.e 0x200006b,0xfe00707f ??
As I am working on adding custom instruction in a tool ,I need to understand the above steps.

2. Is it necessary to change processor RTL to add custom instruction ?
3. How did you provide value for opcode for that instruction i.e you have randomly generated opcode value or is there a method to retrieve opcode value?

@nitish2112.github.io