0   => **InvalidInterrupt** – CPU exception for an invalid interrupt request  
1   => **PageFault** – CPU exception triggered by an illegal memory access  
2   => **ProtectionFault** – CPU exception for a protection violation (e.g., privilege level)  
3   => **InvalidOpcode** – CPU exception for executing an undefined opcode  
4   => **DivideByZero** – CPU exception when dividing by zero  
5   => **StackOverflow** – CPU exception due to stack overflow  
6   => **WriteToReadOnly** – CPU exception for writing to a read‑only segment  
7   => **ReadFromWriteOnly** – CPU exception for reading from a write‑only segment  
8   => **UnmappedIo** – CPU exception for accessing unmapped I/O  

> **Reserved Range (9–31):** Future CPU exceptions

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### IRQ Range (32–63)

- **Hardware** – Represents hardware interrupt requests. 

32 => **SerialIn** – Interrupt triggered by serial input

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### Syscall Range (64–255)

- **Software(u8)** – Represents system calls.  
  The enum is aliased to start at value **128**, so valid syscall numbers are 128‑255.  
  Programs typically use the range **64–127** for OS‑defined syscalls, while values ≥128 are reserved for software interrupts.