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https://github.com/dingusdev/dingusppc.git
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45a9d45e3f
scsibus has a new method attach_scsi_devices which is used by all machines to populate a SCSI bus with one or more hard drives or CD-ROM drives. HDDs are specified by the hdd_img property. CDs are specified by the cdr_img property. Multiple images are delimited by a colon : attach_scsi_devices is called by the scsi controller after the scsi controller has attached itself to the scsi bus. The bus suffix is applied to the property name. Curio has no suffix so it will use hdd_img and cdr_img properties. Mesh is expected to have a suffix of 2 so it will use hdd_img2 and cdr_img2 properties. HDDs will skip SCSI ID 3 unless 7 HDDs are added, in which case, the seventh HDD will use ID 3. CDs will start at SCSI ID 3, go to 7, then down to 0. SCSI IDs are skipped if a device is already using that SCSI ID. ScsiCdrom and ScsiHD no longer use REGISTER_DEVICE or DeviceDescription or PropMap which is normal for devices that can have multiple instances.
292 lines
8.3 KiB
C++
292 lines
8.3 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-24 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file SCSI bus definitions. */
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#ifndef SCSI_H
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#define SCSI_H
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#include <devices/common/hwcomponent.h>
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#include <array>
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#include <cinttypes>
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#include <functional>
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#include <memory>
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#include <string>
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/** SCSI control signals.
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Bit positions follow the MESH controller convention for easier mapping.
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*/
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enum {
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SCSI_CTRL_IO = 1 << 0,
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SCSI_CTRL_CD = 1 << 1,
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SCSI_CTRL_MSG = 1 << 2,
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SCSI_CTRL_ATN = 1 << 3,
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SCSI_CTRL_ACK = 1 << 4,
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SCSI_CTRL_REQ = 1 << 5,
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SCSI_CTRL_SEL = 1 << 13,
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SCSI_CTRL_BSY = 1 << 14,
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SCSI_CTRL_RST = 1 << 15,
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};
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namespace ScsiPhase {
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enum : int {
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BUS_FREE = 0,
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ARBITRATION,
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SELECTION,
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RESELECTION,
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COMMAND,
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DATA_IN,
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DATA_OUT,
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STATUS,
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MESSAGE_IN,
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MESSAGE_OUT,
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RESET,
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};
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};
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namespace ScsiStatus {
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enum : uint8_t {
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GOOD = 0,
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CHECK_CONDITION = 2,
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};
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};
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namespace ScsiMessage {
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enum : uint8_t {
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COMMAND_COMPLETE = 0,
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TARGET_ROUTINE_NUMBER_MASK = 0x07,
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LOGICAL_UNIT_NUMBER_MASK = 0x07,
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IS_TARGET_ROUTINE_NuMBER = 0x20,
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HAS_DISCONNECT_PRIVILEDGE = 0x40,
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IDENTIFY = 0x80,
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};
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};
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enum ScsiMsg : int {
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CONFIRM_SEL = 1,
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BUS_PHASE_CHANGE,
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SEND_CMD_BEGIN,
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SEND_CMD_END,
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MESSAGE_BEGIN,
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MESSAGE_END,
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};
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enum ScsiCommand : uint8_t {
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TEST_UNIT_READY = 0x00,
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REWIND = 0x01,
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REQ_SENSE = 0x03,
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FORMAT_UNIT = 0x04,
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READ_BLK_LIMITS = 0x05,
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READ_6 = 0x08,
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WRITE_6 = 0x0A,
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SEEK_6 = 0x0B,
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INQUIRY = 0x12,
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VERIFY_6 = 0x13,
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MODE_SELECT_6 = 0x15,
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RELEASE_UNIT = 0x17,
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ERASE_6 = 0x19,
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MODE_SENSE_6 = 0x1A,
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START_STOP_UNIT = 0x1B,
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DIAG_RESULTS = 0x1C,
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SEND_DIAGS = 0x1D,
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PREVENT_ALLOW_MEDIUM_REMOVAL = 0x1E,
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READ_CAPACITY_10 = 0x25,
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READ_10 = 0x28,
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WRITE_10 = 0x2A,
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VERIFY_10 = 0x2F,
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READ_LONG_10 = 0x35,
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WRITE_BUFFER = 0x3B,
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READ_BUFFER = 0x3C,
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MODE_SENSE_10 = 0x5A,
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READ_12 = 0xA8,
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// CD-ROM specific commands
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READ_TOC = 0x43,
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SET_CD_SPEED = 0xBB,
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READ_CD = 0xBE,
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};
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enum ScsiSense : int {
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NO_SENSE = 0x0,
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RECOVERED = 0x1,
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NOT_READY = 0x2,
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MEDIUM_ERR = 0x3,
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HW_ERROR = 0x4,
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ILLEGAL_REQ = 0x5,
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UNIT_ATTENTION = 0x6,
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DATA_PROTECT = 0x7,
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BLANK_CHECK = 0x8,
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VOL_OVERFLOW = 0xD,
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MISCOMPARE = 0xE,
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COMPLETED = 0xF
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};
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enum ScsiError : int {
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NO_ERROR = 0x00,
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NO_SECTOR = 0x01,
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WRITE_FAULT = 0x03,
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DEV_NOT_READY = 0x04,
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INVALID_CMD = 0x20,
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INVALID_LBA = 0x21,
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INVALID_CDB = 0x24,
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INVALID_LUN = 0x25,
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WRITE_PROTECT = 0x27,
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MEDIUM_NOT_PRESENT = 0x3A,
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};
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/** Standard SCSI bus timing values measured in ns. */
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#define BUS_SETTLE_DELAY 400
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#define BUS_FREE_DELAY 800
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#define BUS_CLEAR_DELAY 800
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#define ARB_DELAY 2400
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#define SEL_ABORT_TIME 200000
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#define SEL_TIME_OUT 250000000
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#define SCSI_MAX_DEVS 8
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class ScsiBus;
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typedef std::function<void()> action_callback;
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class ScsiDevice : public HWComponent {
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public:
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ScsiDevice(std::string name, int my_id) {
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this->set_name(name);
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supports_types(HWCompType::SCSI_DEV);
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this->scsi_id = my_id;
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this->lun = 0,
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this->cur_phase = ScsiPhase::BUS_FREE;
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};
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~ScsiDevice() = default;
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virtual void notify(ScsiMsg msg_type, int param);
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virtual void next_step();
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virtual void prepare_xfer(ScsiBus* bus_obj, int& bytes_in, int& bytes_out);
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virtual void switch_phase(const int new_phase);
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virtual bool has_data() { return this->data_size != 0; };
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virtual int xfer_data();
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virtual int send_data(uint8_t* dst_ptr, int count);
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virtual int rcv_data(const uint8_t* src_ptr, const int count);
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virtual bool check_lun();
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void illegal_command(const uint8_t* cmd);
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virtual bool prepare_data() = 0;
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virtual bool get_more_data() = 0;
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virtual void process_command() = 0;
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void set_bus_object_ptr(ScsiBus *bus_obj_ptr) {
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this->bus_obj = bus_obj_ptr;
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}
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protected:
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uint8_t cmd_buf[16] = {};
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uint8_t msg_buf[16] = {}; // TODO: clarify how big this one should be
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int scsi_id;
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int lun;
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int initiator_id;
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int cur_phase;
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uint8_t* data_ptr = nullptr;
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int data_size;
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int incoming_size;
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uint8_t status;
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int sense;
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int asc;
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int ascq;
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int sksv;
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int field;
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bool last_selection_has_atention = false;
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uint8_t last_selection_message = 0;
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ScsiBus* bus_obj;
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action_callback pre_xfer_action = nullptr;
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action_callback post_xfer_action = nullptr;
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};
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/** This class provides a higher level abstraction for the SCSI bus. */
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class ScsiBus : public HWComponent {
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public:
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ScsiBus(const std::string name);
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~ScsiBus() = default;
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static std::unique_ptr<HWComponent> create_ScsiMesh() {
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return std::unique_ptr<ScsiBus>(new ScsiBus("ScsiMesh"));
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}
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static std::unique_ptr<HWComponent> create_ScsiCurio() {
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return std::unique_ptr<ScsiBus>(new ScsiBus("ScsiCurio"));
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}
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void attach_scsi_devices(const std::string bus_suffix);
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// low-level state management
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void register_device(int id, ScsiDevice* dev_obj);
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int current_phase() { return this->cur_phase; };
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int get_initiator_id() { return this->initiator_id; };
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int get_target_id() { return this->target_id; };
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// reading/writing control lines
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void assert_ctrl_line(int id, uint16_t mask);
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void release_ctrl_line(int id, uint16_t mask);
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void release_ctrl_lines(int id);
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uint16_t test_ctrl_lines(uint16_t mask);
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// reading/writing data lines
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uint8_t get_data_lines() { return this->data_lines; };
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// high-level control/status
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int switch_phase(int id, int new_phase);
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bool begin_arbitration(int id);
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bool end_arbitration(int id);
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bool begin_selection(int initiator_id, int target_id, bool atn);
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void confirm_selection(int target_id);
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bool end_selection(int initiator_id, int target_id);
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void disconnect(int dev_id);
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bool pull_data(const int id, uint8_t* dst_ptr, const int size);
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bool push_data(const int id, const uint8_t* src_ptr, const int size);
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int target_xfer_data();
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void target_next_step();
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bool negotiate_xfer(int& bytes_in, int& bytes_out);
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protected:
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void change_bus_phase(int initiator_id);
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private:
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// SCSI devices registered with this bus
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std::array<ScsiDevice*, SCSI_MAX_DEVS> devices;
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// per-device state of the control lines
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uint16_t dev_ctrl_lines[SCSI_MAX_DEVS] = {};
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uint16_t ctrl_lines;
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int cur_phase = ScsiPhase::BUS_FREE;
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int arb_winner_id;
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int initiator_id;
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int target_id;
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uint8_t data_lines;
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};
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#endif // SCSI_H
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