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https://github.com/akuker/RASCSI.git
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139 lines
3.8 KiB
C++
139 lines
3.8 KiB
C++
//---------------------------------------------------------------------------
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//
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// SCSI Target Emulator PiSCSI
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// for Raspberry Pi
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//
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// Copyright (C) 2001-2006 ＰＩ．(ytanaka@ipc-tokai.or.jp)
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// Copyright (C) 2014-2020 GIMONS
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// Copyright (C) akuker
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//
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// Licensed under the BSD 3-Clause License.
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// See LICENSE file in the project root folder.
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//
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//---------------------------------------------------------------------------
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#pragma once
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#include "shared/scsi.h"
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#include "abstract_controller.h"
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#include <array>
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using namespace std;
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class PrimaryDevice;
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// Mac Plus/SCSI-1 compatibility mode
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// Mac Plus and other early SCSI-1 hosts have timing and protocol quirks
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enum class CompatibilityMode {
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STANDARD, // Standard SCSI-2 operation
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MAC_PLUS, // Mac Plus compatibility (SCSI-1 with specific quirks)
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SCSI1_COMPAT // Generic SCSI-1 compatibility
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};
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class ScsiController : public AbstractController
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{
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// For timing adjustments
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public:
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static unsigned int MIN_EXEC_TIME;
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static void SetMinExecTime(unsigned int usec) { MIN_EXEC_TIME = usec; }
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// Mac Plus/SCSI-1 compatibility mode
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static CompatibilityMode default_compat_mode;
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static void SetDefaultCompatibilityMode(CompatibilityMode mode) { default_compat_mode = mode; }
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static CompatibilityMode GetDefaultCompatibilityMode() { return default_compat_mode; }
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// Transfer period factor (limited to 50 x 4 = 200ns)
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static const int MAX_SYNC_PERIOD = 50;
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// REQ/ACK offset(limited to 16)
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static const uint8_t MAX_SYNC_OFFSET = 16;
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const int DEFAULT_BUFFER_SIZE = 0x1000;
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struct scsi_t {
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// Synchronous transfer
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bool syncenable; // Synchronous transfer possible
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uint8_t syncperiod = MAX_SYNC_PERIOD; // Synchronous transfer period
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uint8_t syncoffset; // Synchronous transfer offset
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int syncack; // Number of synchronous transfer ACKs
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// ATN message
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bool atnmsg;
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int msc;
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array<uint8_t, 256> msb;
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};
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public:
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ScsiController(BUS&, int);
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~ScsiController() override = default;
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void Reset() override;
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bool Process(int) override;
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int GetEffectiveLun() const override;
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void Error(scsi_defs::sense_key sense_key, scsi_defs::asc asc = scsi_defs::asc::no_additional_sense_information,
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scsi_defs::status status = scsi_defs::status::check_condition) override;
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int GetInitiatorId() const override { return initiator_id; }
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// Phases
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void BusFree() override;
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void Selection() override;
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void Command() override;
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void MsgIn() override;
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void MsgOut() override;
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void Status() override;
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void DataIn() override;
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void DataOut() override;
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private:
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// Execution start time
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uint32_t execstart = 0;
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// The initiator ID may be unavailable, e.g. with Atari ACSI and old host adapters
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int initiator_id = UNKNOWN_INITIATOR_ID;
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// The LUN from the IDENTIFY message
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int identified_lun = -1;
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// SCSI-1 host detected (no ATN during selection - e.g., Mac Plus)
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bool scsi1_detected = false;
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// Instance-level compatibility mode (initialized from static default)
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CompatibilityMode compat_mode = CompatibilityMode::STANDARD;
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// Enable SCSI-1 compatibility behaviors on all attached devices
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void EnableScsi1Compatibility();
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// Check if running in Mac Plus or SCSI-1 compatibility mode
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bool IsMacPlusMode() const { return compat_mode == CompatibilityMode::MAC_PLUS; }
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bool IsScsi1Mode() const { return scsi1_detected || compat_mode != CompatibilityMode::STANDARD; }
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// Data transfer
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void Send();
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bool XferMsg(int);
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bool XferIn(vector<uint8_t>&);
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bool XferOut(bool);
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bool XferOutBlockOriented(bool);
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void ReceiveBytes();
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void DataOutNonBlockOriented() const;
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void Receive();
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// TODO Make non-virtual as soon as SysTimer calls do not segfault anymore on a regular PC, e.g. by using ifdef __arm__.
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virtual void Execute();
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void ProcessCommand();
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void ParseMessage();
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void ProcessMessage();
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void Sleep();
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scsi_t scsi = {};
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};
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