all: Add GPU mining, disabled by default

eth/cpu_mining.go

@@ -0,0 +1,54 @@
+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build !opencl
+
+package eth
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+)
+
+const disabledInfo = "Set GO_OPENCL and re-build to enable."
+
+func (s *Ethereum) StartMining(threads int, gpus string) error {
+	eb, err := s.Etherbase()
+	if err != nil {
+		err = fmt.Errorf("Cannot start mining without etherbase address: %v", err)
+		glog.V(logger.Error).Infoln(err)
+		return err
+	}
+
+	if gpus != "" {
+		return errors.New("GPU mining disabled. " + disabledInfo)
+	}
+
+	// CPU mining
+	go s.miner.Start(eb, threads)
+	return nil
+}
+
+func GPUBench(gpuid uint64) {
+	fmt.Println("GPU mining disabled. " + disabledInfo)
+}
+
+func PrintOpenCLDevices() {
+	fmt.Println("OpenCL disabled. " + disabledInfo)
+}