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bus.go
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bus.go
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// This file is part of Gopher2600.
//
// Gopher2600 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Gopher2600 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
package lazyvalues
import (
"sync/atomic"
)
// LazyBus lazily accesses Mem information from the emulator.
type LazyBus struct {
val *LazyValues
addressBus atomic.Value // uint16
dataBus atomic.Value // uint8
lastCPUWrite atomic.Value // bool
dataBusDriven atomic.Value // uint8
AddressBus uint16
DataBus uint8
LastCPUWrite bool
DataBusDriven uint8
}
func newLazyBus(val *LazyValues) *LazyBus {
return &LazyBus{val: val}
}
func (lz *LazyBus) push() {
lz.addressBus.Store(lz.val.vcs.Mem.AddressBus)
lz.dataBus.Store(lz.val.vcs.Mem.DataBus)
lz.lastCPUWrite.Store(lz.val.vcs.Mem.LastCPUWrite)
lz.dataBusDriven.Store(lz.val.vcs.Mem.DataBusDriven)
}
func (lz *LazyBus) update() {
lz.AddressBus, _ = lz.addressBus.Load().(uint16)
lz.DataBus, _ = lz.dataBus.Load().(uint8)
lz.LastCPUWrite, _ = lz.lastCPUWrite.Load().(bool)
lz.DataBusDriven, _ = lz.dataBusDriven.Load().(uint8)
}