bip44 – where is index value or hexa value of bitcoin in source code?

Registered coin types
These are the default registered coin types for usage in level 2 of BIP44 described in chapter “Coin type” above.

All these constants are used as hardened derivation.

index   hexa    coin
0   0x80000000  Bitcoin
1   0x80000001  Bitcoin Testnet

where we can find index, hexa of bitcoin for BIP44 ? how to calculate it ?