RASCSI/cpp/controllers/scsi_controller.h
2023-10-29 13:01:12 +01:00

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//---------------------------------------------------------------------------
//
// SCSI Target Emulator PiSCSI
// for Raspberry Pi
//
// Copyright (C) 2001-2006 (ytanaka@ipc-tokai.or.jp)
// Copyright (C) 2014-2020 GIMONS
// Copyright (C) akuker
//
// Licensed under the BSD 3-Clause License.
// See LICENSE file in the project root folder.
//
//---------------------------------------------------------------------------
#pragma once
#include "shared/scsi.h"
#include "abstract_controller.h"
#include <array>
using namespace std;
class PrimaryDevice;
class ScsiController : public AbstractController
{
// For timing adjustments
static const unsigned int MIN_EXEC_TIME = 50;
// Transfer period factor (limited to 50 x 4 = 200ns)
static const int MAX_SYNC_PERIOD = 50;
// REQ/ACK offset(limited to 16)
static const uint8_t MAX_SYNC_OFFSET = 16;
const int DEFAULT_BUFFER_SIZE = 0x1000;
using scsi_t = struct _scsi_t {
// Synchronous transfer
bool syncenable; // Synchronous transfer possible
uint8_t syncperiod = MAX_SYNC_PERIOD; // Synchronous transfer period
uint8_t syncoffset; // Synchronous transfer offset
int syncack; // Number of synchronous transfer ACKs
// ATN message
bool atnmsg;
int msc;
array<uint8_t, 256> msb;
};
public:
ScsiController(BUS&, int);
~ScsiController() override = default;
void Reset() override;
bool Process(int) override;
int GetEffectiveLun() const override;
void Error(scsi_defs::sense_key sense_key, scsi_defs::asc asc = scsi_defs::asc::no_additional_sense_information,
scsi_defs::status status = scsi_defs::status::check_condition) override;
int GetInitiatorId() const override { return initiator_id; }
// Phases
void BusFree() override;
void Selection() override;
void Command() override;
void MsgIn() override;
void MsgOut() override;
void Status() override;
void DataIn() override;
void DataOut() override;
private:
// Execution start time
uint32_t execstart = 0;
// The initiator ID may be unavailable, e.g. with Atari ACSI and old host adapters
int initiator_id = UNKNOWN_INITIATOR_ID;
// The LUN from the IDENTIFY message
int identified_lun = -1;
// Data transfer
void Send();
bool XferMsg(int);
bool XferIn(vector<uint8_t>&);
bool XferOut(bool);
bool XferOutBlockOriented(bool);
void ReceiveBytes();
void DataOutNonBlockOriented() const;
void Receive();
// TODO Make non-virtual as soon as SysTimer calls do not segfault anymore on a regular PC, e.g. by using ifdef __arm__.
virtual void Execute();
void ProcessCommand();
void ParseMessage();
void ProcessMessage();
void Sleep();
scsi_t scsi = {};
};