feature(op-geth): add opbnb gasless solution

consensus/misc/eip1559/eip1559.go

@@ -58,6 +58,9 @@ func VerifyEIP1559Header(config *params.ChainConfig, parent, header *types.Heade
 // CalcBaseFee calculates the basefee of the header.
 // The time belongs to the new block to check if Canyon is activted or not
 func CalcBaseFee(config *params.ChainConfig, parent *types.Header, time uint64) *big.Int {
+	if config.IsWright(time) {
+		return new(big.Int).SetUint64(params.OpBNBBaseFeeForGasLess)
+	}
 	// If the current block is the first EIP-1559 block, return the InitialBaseFee.
 	if !config.IsLondon(parent.Number) {
 		return new(big.Int).SetUint64(params.InitialBaseFee)

core/state_transition.go

@@ -250,6 +250,11 @@ func (st *StateTransition) buyGas() error {
 	mgval = mgval.Mul(mgval, st.msg.GasPrice)
 	var l1Cost *big.Int
 	if st.evm.Context.L1CostFunc != nil && !st.msg.SkipAccountChecks {
+		if st.msg.GasPrice.Cmp(big.NewInt(0)) == 0 {
+			l1Cost = big.NewInt(0)
+		} else {
+			l1Cost = st.evm.Context.L1CostFunc(st.msg.RollupCostData, st.evm.Context.Time)
+		}
 		l1Cost = st.evm.Context.L1CostFunc(st.msg.RollupCostData, st.evm.Context.Time)
 		if l1Cost != nil {
 			mgval = mgval.Add(mgval, l1Cost)