mirror of https://github.com/akuker/RASCSI.git
594 lines
19 KiB
C++
594 lines
19 KiB
C++
//---------------------------------------------------------------------------
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//
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// SCSI Target Emulator RaSCSI (*^..^*)
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// for Raspberry Pi
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//
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// Copyright (C) 2020 akuker
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// Copyright (C) 2014-2020 GIMONS
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// Copyright (C) 2001-2006 ＰＩ．(ytanaka@ipc-tokai.or.jp)
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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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// [ Emulation of the DaynaPort SCSI Link Ethernet interface ]
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//
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// This design is derived from the SLINKCMD.TXT file, as well as David Kuder's
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// Tiny SCSI Emulator
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// - SLINKCMD: http://www.bitsavers.org/pdf/apple/scsi/dayna/daynaPORT/SLINKCMD.TXT
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// - Tiny SCSI : https://hackaday.io/project/18974-tiny-scsi-emulator
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//
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// Additional documentation and clarification is available at the
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// following link:
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// - https://github.com/akuker/RASCSI/wiki/Dayna-Port-SCSI-Link
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//
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// This does NOT include the file system functionality that is present
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// in the Sharp X68000 host bridge.
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//
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// Note: This requires a DaynaPort SCSI Link driver.
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//---------------------------------------------------------------------------
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#include "scsi_daynaport.h"
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using namespace scsi_defs;
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const BYTE SCSIDaynaPort::m_bcast_addr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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const BYTE SCSIDaynaPort::m_apple_talk_addr[6] = { 0x09, 0x00, 0x07, 0xff, 0xff, 0xff };
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// TODO Disk should not be the superclass
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SCSIDaynaPort::SCSIDaynaPort() : Disk("SCDP")
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{
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m_tap = NULL;
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m_bTapEnable = false;
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dispatcher.AddCommand(eCmdTestUnitReady, "TestUnitReady", &SCSIDaynaPort::TestUnitReady);
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dispatcher.AddCommand(eCmdRead6, "Read6", &SCSIDaynaPort::Read6);
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dispatcher.AddCommand(eCmdWrite6, "Write6", &SCSIDaynaPort::Write6);
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dispatcher.AddCommand(eCmdRetrieveStats, "RetrieveStats", &SCSIDaynaPort::RetrieveStatistics);
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dispatcher.AddCommand(eCmdSetIfaceMode, "SetIfaceMode", &SCSIDaynaPort::SetInterfaceMode);
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dispatcher.AddCommand(eCmdSetMcastAddr, "SetMcastAddr", &SCSIDaynaPort::SetMcastAddr);
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dispatcher.AddCommand(eCmdEnableInterface, "EnableInterface", &SCSIDaynaPort::EnableInterface);
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}
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SCSIDaynaPort::~SCSIDaynaPort()
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{
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// TAP driver release
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if (m_tap) {
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m_tap->Cleanup();
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delete m_tap;
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}
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}
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bool SCSIDaynaPort::Dispatch(SCSIDEV *controller)
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{
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// The superclass class handles the less specific commands
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return dispatcher.Dispatch(this, controller) ? true : super::Dispatch(controller);
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}
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bool SCSIDaynaPort::Init(const map<string, string>& params)
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{
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SetParams(params);
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#ifdef __linux__
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// TAP Driver Generation
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m_tap = new CTapDriver();
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m_bTapEnable = m_tap->Init(GetParams());
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if(!m_bTapEnable){
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LOGERROR("Unable to open the TAP interface");
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// Not terminating on regular Linux PCs is helpful for testing
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#if !defined(__x86_64__) && !defined(__X86__)
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return false;
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#endif
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} else {
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LOGDEBUG("Tap interface created");
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}
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this->Reset();
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SetReady(true);
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SetReset(false);
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// Generate MAC Address
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memset(m_mac_addr, 0x00, 6);
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// if (m_bTapEnable) {
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// tap->GetMacAddr(m_mac_addr);
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// m_mac_addr[5]++;
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// }
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// !!!!!!!!!!!!!!!!! For now, hard code the MAC address. Its annoying when it keeps changing during development!
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// TODO: Remove this hard-coded address
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m_mac_addr[0]=0x00;
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m_mac_addr[1]=0x80;
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m_mac_addr[2]=0x19;
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m_mac_addr[3]=0x10;
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m_mac_addr[4]=0x98;
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m_mac_addr[5]=0xE3;
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#endif // linux
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return true;
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}
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void SCSIDaynaPort::Open(const Filepath& path)
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{
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m_tap->OpenDump(path);
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}
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int SCSIDaynaPort::Inquiry(const DWORD *cdb, BYTE *buf)
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{
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// Processor device, SCSI-2, not removable
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return PrimaryDevice::Inquiry(3, 2, false, cdb, buf);
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}
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//---------------------------------------------------------------------------
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//
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// READ
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//
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// Command: 08 00 00 LL LL XX (LLLL is data length, XX = c0 or 80)
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// Function: Read a packet at a time from the device (standard SCSI Read)
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// Type: Input; the following data is returned:
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// LL LL NN NN NN NN XX XX XX ... CC CC CC CC
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// where:
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// LLLL is normally the length of the packet (a 2-byte
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// big-endian hex value), including 4 trailing bytes
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// of CRC, but excluding itself and the flag field.
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// See below for special values
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// NNNNNNNN is a 4-byte flag field with the following meanings:
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// FFFFFFFF a packet has been dropped (?); in this case
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// the length field appears to be always 4000
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// 00000010 there are more packets currently available
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// in SCSI/Link memory
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// 00000000 this is the last packet
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// XX XX ... is the actual packet
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// CCCCCCCC is the CRC
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//
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// Notes:
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// - When all packets have been retrieved successfully, a length field
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// of 0000 is returned; however, if a packet has been dropped, the
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// SCSI/Link will instead return a non-zero length field with a flag
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// of FFFFFFFF when there are no more packets available. This behaviour
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// seems to continue until a disable/enable sequence has been issued.
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// - The SCSI/Link apparently has about 6KB buffer space for packets.
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//
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//---------------------------------------------------------------------------
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int SCSIDaynaPort::Read(const DWORD *cdb, BYTE *buf, uint64_t block)
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{
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int rx_packet_size = 0;
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scsi_resp_read_t *response = (scsi_resp_read_t*)buf;
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int requested_length = cdb[4];
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LOGTRACE("%s Read maximum length %d, (%04X)", __PRETTY_FUNCTION__, requested_length, requested_length);
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// At host startup, it will send a READ(6) command with a length of 1. We should
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// respond by going into the status mode with a code of 0x02
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if (requested_length == 1) {
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return 0;
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}
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// Some of the packets we receive will not be for us. So, we'll keep pulling messages
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// until the buffer is empty, or we've read X times. (X is just a made up number)
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bool send_message_to_host;
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int read_count = 0;
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while (read_count < MAX_READ_RETRIES) {
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read_count++;
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// The first 2 bytes are reserved for the length of the packet
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// The next 4 bytes are reserved for a flag field
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//rx_packet_size = m_tap->Rx(response->data);
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rx_packet_size = m_tap->Rx(&buf[DAYNAPORT_READ_HEADER_SZ]);
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// If we didn't receive anything, return size of 0
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if (rx_packet_size <= 0) {
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LOGTRACE("%s No packet received", __PRETTY_FUNCTION__);
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response->length = 0;
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response->flags = e_no_more_data;
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return DAYNAPORT_READ_HEADER_SZ;
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}
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LOGTRACE("%s Packet Sz %d (%08X) read: %d", __PRETTY_FUNCTION__, (unsigned int) rx_packet_size, (unsigned int) rx_packet_size, read_count);
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// This is a very basic filter to prevent unnecessary packets from
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// being sent to the SCSI initiator.
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send_message_to_host = false;
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// The following doesn't seem to work with unicast messages. Temporarily removing the filtering
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// functionality.
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/////// // Check if received packet destination MAC address matches the
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/////// // DaynaPort MAC. For IP packets, the mac_address will be the first 6 bytes
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/////// // of the data.
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/////// if (memcmp(response->data, m_mac_addr, 6) == 0) {
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/////// send_message_to_host = true;
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/////// }
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/////// // Check to see if this is a broadcast message
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/////// if (memcmp(response->data, m_bcast_addr, 6) == 0) {
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/////// send_message_to_host = true;
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/////// }
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/////// // Check to see if this is an AppleTalk Message
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/////// if (memcmp(response->data, m_apple_talk_addr, 6) == 0) {
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/////// send_message_to_host = true;
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/////// }
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send_message_to_host = true;
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// TODO: We should check to see if this message is in the multicast
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// configuration from SCSI command 0x0D
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if (!send_message_to_host) {
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LOGDEBUG("%s Received a packet that's not for me: %02X %02X %02X %02X %02X %02X", \
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__PRETTY_FUNCTION__,
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(int)response->data[0],
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(int)response->data[1],
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(int)response->data[2],
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(int)response->data[3],
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(int)response->data[4],
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(int)response->data[5]);
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// If there are pending packets to be processed, we'll tell the host that the read
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// length was 0.
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if (!m_tap->PendingPackets())
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{
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response->length = 0;
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response->flags = e_no_more_data;
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return DAYNAPORT_READ_HEADER_SZ;
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}
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}
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else {
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// TODO: Need to do some sort of size checking. The buffer can easily overflow, probably.
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// response->length = rx_packet_size;
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// if(m_tap->PendingPackets()){
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// response->flags = e_more_data_available;
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// } else {
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// response->flags = e_no_more_data;
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// }
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int size = rx_packet_size;
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if (size < 64) {
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// A frame must have at least 64 bytes (see https://github.com/akuker/RASCSI/issues/619)
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// Note that this work-around breaks the checksum. As currently there are no known drivers
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// that care for the checksum, and the Daynaport driver for the Atari expects frames of
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// 64 bytes it was decided to accept the broken checksum. If a driver should pop up that
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// breaks because of this, the work-around has to be re-evaluated.
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size = 64;
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}
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buf[0] = size >> 8;
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buf[1] = size;
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buf[2] = 0;
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buf[3] = 0;
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buf[4] = 0;
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if(m_tap->PendingPackets()){
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buf[5] = 0x10;
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} else {
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buf[5] = 0;
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}
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// Return the packet size + 2 for the length + 4 for the flag field
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// The CRC was already appended by the ctapdriver
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return size + DAYNAPORT_READ_HEADER_SZ;
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}
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// If we got to this point, there are still messages in the queue, so
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// we should loop back and get the next one.
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} // end while
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response->length = 0;
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response->flags = e_no_more_data;
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return DAYNAPORT_READ_HEADER_SZ;
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}
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//---------------------------------------------------------------------------
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//
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// WRITE check
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//
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//---------------------------------------------------------------------------
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int SCSIDaynaPort::WriteCheck(DWORD block)
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{
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// Status check
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if (!CheckReady()) {
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return 0;
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}
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if (!m_bTapEnable){
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SetStatusCode(STATUS_NOTREADY);
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return 0;
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}
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// Success
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return 1;
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}
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//---------------------------------------------------------------------------
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//
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// Write
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//
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// Command: 0a 00 00 LL LL XX (LLLL is data length, XX = 80 or 00)
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// Function: Write a packet at a time to the device (standard SCSI Write)
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// Type: Output; the format of the data to be sent depends on the value
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// of XX, as follows:
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// - if XX = 00, LLLL is the packet length, and the data to be sent
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// must be an image of the data packet
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// - if XX = 80, LLLL is the packet length + 8, and the data to be
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// sent is:
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// PP PP 00 00 XX XX XX ... 00 00 00 00
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// where:
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// PPPP is the actual (2-byte big-endian) packet length
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// XX XX ... is the actual packet
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//
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//---------------------------------------------------------------------------
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bool SCSIDaynaPort::Write(const DWORD *cdb, const BYTE *buf, DWORD block)
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{
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BYTE data_format = cdb[5];
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WORD data_length = (WORD)cdb[4] + ((WORD)cdb[3] << 8);
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if (data_format == 0x00){
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m_tap->Tx(buf, data_length);
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LOGTRACE("%s Transmitted %u bytes (00 format)", __PRETTY_FUNCTION__, data_length);
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return true;
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}
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else if (data_format == 0x80){
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// The data length is specified in the first 2 bytes of the payload
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data_length=(WORD)buf[1] + ((WORD)buf[0] << 8);
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m_tap->Tx(&buf[4], data_length);
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LOGTRACE("%s Transmitted %u bytes (80 format)", __PRETTY_FUNCTION__, data_length);
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return true;
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}
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else
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{
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// LOGWARN("%s Unknown data format %02X", __PRETTY_FUNCTION__, (unsigned int)command->format);
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LOGWARN("%s Unknown data format %02X", __PRETTY_FUNCTION__, (unsigned int)data_format);
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return true;
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}
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}
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//---------------------------------------------------------------------------
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//
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// RetrieveStats
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//
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// Command: 09 00 00 00 12 00
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// Function: Retrieve MAC address and device statistics
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// Type: Input; returns 18 (decimal) bytes of data as follows:
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// - bytes 0-5: the current hardware ethernet (MAC) address
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// - bytes 6-17: three long word (4-byte) counters (little-endian).
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// Notes: The contents of the three longs are typically zero, and their
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// usage is unclear; they are suspected to be:
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// - long #1: frame alignment errors
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// - long #2: CRC errors
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// - long #3: frames lost
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//
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//---------------------------------------------------------------------------
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int SCSIDaynaPort::RetrieveStats(const DWORD *cdb, BYTE *buffer)
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{
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int allocation_length = cdb[4] + (((DWORD)cdb[3]) << 8);
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// memset(buffer,0,18);
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// memcpy(&buffer[0],m_mac_addr,sizeof(m_mac_addr));
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// uint32_t frame_alignment_errors;
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// uint32_t crc_errors;
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// uint32_t frames_lost;
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// // frame alignment errors
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// frame_alignment_errors = htonl(0);
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// memcpy(&(buffer[6]),&frame_alignment_errors,sizeof(frame_alignment_errors));
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// // CRC errors
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// crc_errors = htonl(0);
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// memcpy(&(buffer[10]),&crc_errors,sizeof(crc_errors));
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// // frames lost
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// frames_lost = htonl(0);
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// memcpy(&(buffer[14]),&frames_lost,sizeof(frames_lost));
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int response_size = sizeof(m_scsi_link_stats);
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memcpy(buffer, &m_scsi_link_stats, sizeof(m_scsi_link_stats));
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if (response_size > allocation_length) {
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response_size = allocation_length;
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}
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// Success
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return response_size;
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}
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//---------------------------------------------------------------------------
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//
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// Enable or Disable the interface
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//
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// Command: 0e 00 00 00 00 XX (XX = 80 or 00)
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// Function: Enable (80) / disable (00) Ethernet interface
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// Type: No data transferred
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// Notes: After issuing an Enable, the initiator should avoid sending
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// any subsequent commands to the device for approximately 0.5
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// seconds
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//
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//---------------------------------------------------------------------------
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bool SCSIDaynaPort::EnableInterface(const DWORD *cdb)
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{
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bool result;
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if (cdb[5] & 0x80) {
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result = m_tap->Enable();
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if (result) {
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LOGINFO("The DaynaPort interface has been ENABLED.");
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}
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else{
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LOGWARN("Unable to enable the DaynaPort Interface");
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}
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m_tap->Flush();
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}
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else {
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result = m_tap->Disable();
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if (result) {
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LOGINFO("The DaynaPort interface has been DISABLED.");
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}
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else{
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LOGWARN("Unable to disable the DaynaPort Interface");
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}
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}
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return result;
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}
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void SCSIDaynaPort::TestUnitReady(SASIDEV *controller)
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{
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// TEST UNIT READY Success
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controller->Status();
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}
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void SCSIDaynaPort::Read6(SASIDEV *controller)
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{
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// Get record number and block number
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uint32_t record = ctrl->cmd[1] & 0x1f;
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record <<= 8;
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record |= ctrl->cmd[2];
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record <<= 8;
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record |= ctrl->cmd[3];
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ctrl->blocks=1;
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// If any commands have a bogus control value, they were probably not
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// generated by the DaynaPort driver so ignore them
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if (ctrl->cmd[5] != 0xc0 && ctrl->cmd[5] != 0x80) {
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LOGTRACE("%s Control value %d, (%04X), returning invalid CDB", __PRETTY_FUNCTION__, ctrl->cmd[5], ctrl->cmd[5]);
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controller->Error(ERROR_CODES::sense_key::ILLEGAL_REQUEST, ERROR_CODES::asc::INVALID_FIELD_IN_CDB);
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return;
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}
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LOGTRACE("%s READ(6) command record=%d blocks=%d", __PRETTY_FUNCTION__, (unsigned int)record, (int)ctrl->blocks);
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ctrl->length = Read(ctrl->cmd, ctrl->buffer, record);
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LOGTRACE("%s ctrl.length is %d", __PRETTY_FUNCTION__, (int)ctrl->length);
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// Set next block
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ctrl->next = record + 1;
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controller->DataIn();
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}
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void SCSIDaynaPort::Write6(SASIDEV *controller)
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{
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// Reallocate buffer (because it is not transfer for each block)
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if (ctrl->bufsize < DAYNAPORT_BUFFER_SIZE) {
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free(ctrl->buffer);
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ctrl->bufsize = DAYNAPORT_BUFFER_SIZE;
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ctrl->buffer = (BYTE *)malloc(ctrl->bufsize);
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}
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DWORD data_format = ctrl->cmd[5];
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if(data_format == 0x00) {
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ctrl->length = (WORD)ctrl->cmd[4] + ((WORD)ctrl->cmd[3] << 8);
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}
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else if (data_format == 0x80) {
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ctrl->length = (WORD)ctrl->cmd[4] + ((WORD)ctrl->cmd[3] << 8) + 8;
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}
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else {
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LOGWARN("%s Unknown data format %02X", __PRETTY_FUNCTION__, (unsigned int)data_format);
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}
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LOGTRACE("%s length: %04X (%d) format: %02X", __PRETTY_FUNCTION__, (unsigned int)ctrl->length, (int)ctrl->length, (unsigned int)data_format);
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if (ctrl->length <= 0) {
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// Failure (Error)
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controller->Error();
|
||
return;
|
||
}
|
||
|
||
// Set next block
|
||
ctrl->blocks = 1;
|
||
ctrl->next = 1;
|
||
|
||
controller->DataOut();
|
||
}
|
||
|
||
void SCSIDaynaPort::RetrieveStatistics(SASIDEV *controller)
|
||
{
|
||
ctrl->length = RetrieveStats(ctrl->cmd, ctrl->buffer);
|
||
if (ctrl->length <= 0) {
|
||
// Failure (Error)
|
||
controller->Error();
|
||
return;
|
||
}
|
||
|
||
// Set next block
|
||
ctrl->blocks = 1;
|
||
ctrl->next = 1;
|
||
|
||
controller->DataIn();
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
//
|
||
// Set interface mode/Set MAC address
|
||
//
|
||
// Set Interface Mode (0c)
|
||
// -----------------------
|
||
// Command: 0c 00 00 00 FF 80 (FF = 08 or 04)
|
||
// Function: Allow interface to receive broadcast messages (FF = 04); the
|
||
// function of (FF = 08) is currently unknown.
|
||
// Type: No data transferred
|
||
// Notes: This command is accepted by firmware 1.4a & 2.0f, but has no
|
||
// effect on 2.0f, which is always capable of receiving broadcast
|
||
// messages. In 1.4a, once broadcast mode is set, it remains set
|
||
// until the interface is disabled.
|
||
//
|
||
// Set MAC Address (0c)
|
||
// --------------------
|
||
// Command: 0c 00 00 00 FF 40 (FF = 08 or 04)
|
||
// Function: Set MAC address
|
||
// Type: Output; overrides built-in MAC address with user-specified
|
||
// 6-byte value
|
||
// Notes: This command is intended primarily for debugging/test purposes.
|
||
// Disabling the interface resets the MAC address to the built-in
|
||
// value.
|
||
//
|
||
//---------------------------------------------------------------------------
|
||
void SCSIDaynaPort::SetInterfaceMode(SASIDEV *controller)
|
||
{
|
||
// Check whether this command is telling us to "Set Interface Mode" or "Set MAC Address"
|
||
|
||
ctrl->length = RetrieveStats(ctrl->cmd, ctrl->buffer);
|
||
switch(ctrl->cmd[5]){
|
||
case SCSIDaynaPort::CMD_SCSILINK_SETMODE:
|
||
// TODO Not implemented, do nothing
|
||
controller->Status();
|
||
break;
|
||
|
||
case SCSIDaynaPort::CMD_SCSILINK_SETMAC:
|
||
ctrl->length = 6;
|
||
controller->DataOut();
|
||
break;
|
||
|
||
default:
|
||
LOGWARN("%s Unknown SetInterface command received: %02X", __PRETTY_FUNCTION__, (unsigned int)ctrl->cmd[5]);
|
||
break;
|
||
}
|
||
}
|
||
|
||
void SCSIDaynaPort::SetMcastAddr(SASIDEV *controller)
|
||
{
|
||
ctrl->length = (DWORD)ctrl->cmd[4];
|
||
if (ctrl->length == 0) {
|
||
LOGWARN("%s Not supported SetMcastAddr Command %02X", __PRETTY_FUNCTION__, (WORD)ctrl->cmd[2]);
|
||
|
||
// Failure (Error)
|
||
controller->Error();
|
||
return;
|
||
}
|
||
|
||
controller->DataOut();
|
||
}
|
||
|
||
void SCSIDaynaPort::EnableInterface(SASIDEV *controller)
|
||
{
|
||
bool status = EnableInterface(ctrl->cmd);
|
||
if (!status) {
|
||
// Failure (Error)
|
||
controller->Error();
|
||
return;
|
||
}
|
||
|
||
controller->Status();
|
||
}
|
||
|
||
int SCSIDaynaPort::GetSendDelay()
|
||
{
|
||
// The Daynaport needs to have a delay after the size/flags field
|
||
// of the read response. In the MacOS driver, it looks like the
|
||
// driver is doing two "READ" system calls.
|
||
return DAYNAPORT_READ_HEADER_SZ;
|
||
}
|