private void WritetoMemoryOrPort(
ushort address,
byte value,
IMemory memory,
MemoryAccessMode accessMode,
MemoryAccessEventType beforeEventType,
MemoryAccessEventType afterEventType,
byte waitStates)
{
var beforeEventArgs = FireMemoryAccessEvent(beforeEventType, address, value);
if (!beforeEventArgs.CancelMemoryAccess &&
(accessMode == MemoryAccessMode.ReadAndWrite || accessMode == MemoryAccessMode.WriteOnly))
{
memory[address] = beforeEventArgs.Value;
}
if (executionContext != null)
{
executionContext.AccummulatedMemoryWaitStates += waitStates;
}
FireMemoryAccessEvent(
afterEventType,
address,
beforeEventArgs.Value,
beforeEventArgs.LocalUserState,
beforeEventArgs.CancelMemoryAccess);
}
MemoryAccessEventArgs FireMemoryAccessEvent(
MemoryAccessEventType eventType,
ushort address,
byte value,
object localUserState = null,
bool cancelMemoryAccess = false)
{
var eventArgs = new MemoryAccessEventArgs(eventType, address, value, localUserState, cancelMemoryAccess);
MemoryAccess?.Invoke(this, eventArgs);
return(eventArgs);
}
/// <summary>
/// Initializes a new instance of the class.
/// </summary>
/// <param name="eventType">Type of event being processed</param>
/// <param name="address">Memory or port address being accessed</param>
/// <param name="value">Initial value for the <see cref="Value"/> property</param>
/// <param name="localUserState">Initial value for the <see cref="ProcessorEventArgs.LocalUserState"/> property</param>
/// <param name="cancelMemoryAccess">Initial value for the <see cref="CancelMemoryAccess"/> property</param>
public MemoryAccessEventArgs(
MemoryAccessEventType eventType,
ushort address,
byte value,
object localUserState = null,
bool cancelMemoryAccess = false)
{
this.EventType = eventType;
this.Address = address;
this.Value = value;
this.LocalUserState = localUserState;
this.CancelMemoryAccess = cancelMemoryAccess;
}
private byte ReadFromMemoryOrPort(
ushort address,
IMemory memory,
MemoryAccessMode accessMode,
MemoryAccessEventType beforeEventType,
MemoryAccessEventType afterEventType,
byte waitStates)
{
var beforeEventArgs = FireMemoryAccessEvent(beforeEventType, address, 0xFF);
byte value;
if (!beforeEventArgs.CancelMemoryAccess &&
(accessMode == MemoryAccessMode.ReadAndWrite || accessMode == MemoryAccessMode.ReadOnly))
{
value = memory[address];
}
else
{
value = beforeEventArgs.Value;
}
if (executionContext != null)
{
executionContext.AccummulatedMemoryWaitStates += waitStates;
}
var afterEventArgs = FireMemoryAccessEvent(
afterEventType,
address,
value,
beforeEventArgs.LocalUserState,
beforeEventArgs.CancelMemoryAccess);
return(afterEventArgs.Value);
}
