mirror of https://github.com/akuker/RASCSI.git
223 lines
5.6 KiB
C++
223 lines
5.6 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) 2022 Uwe Seimet
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//
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//---------------------------------------------------------------------------
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#include "log.h"
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#include "controllers/scsidev_ctrl.h"
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#include "dispatcher.h"
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#include "primary_device.h"
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using namespace std;
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using namespace scsi_defs;
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PrimaryDevice::PrimaryDevice(const string& id) : ScsiPrimaryCommands(), Device(id)
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{
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ctrl = NULL;
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// Mandatory SCSI primary commands
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dispatcher.AddCommand(eCmdTestUnitReady, "TestUnitReady", &PrimaryDevice::TestUnitReady);
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dispatcher.AddCommand(eCmdInquiry, "Inquiry", &PrimaryDevice::Inquiry);
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dispatcher.AddCommand(eCmdReportLuns, "ReportLuns", &PrimaryDevice::ReportLuns);
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// Optional commands used by all RaSCSI devices
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dispatcher.AddCommand(eCmdRequestSense, "RequestSense", &PrimaryDevice::RequestSense);
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}
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bool PrimaryDevice::Dispatch(SCSIDEV *controller)
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{
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return dispatcher.Dispatch(this, controller);
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}
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void PrimaryDevice::TestUnitReady(SASIDEV *controller)
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{
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if (!CheckReady()) {
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controller->Error();
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return;
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}
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controller->Status();
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}
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void PrimaryDevice::Inquiry(SASIDEV *controller)
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{
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ctrl->length = Inquiry(ctrl->cmd, ctrl->buffer);
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if (ctrl->length <= 0) {
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controller->Error();
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return;
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}
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int lun = controller->GetEffectiveLun();
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// Report if the device does not support the requested LUN
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if (!ctrl->unit[lun]) {
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LOGTRACE("Reporting LUN %d for device ID %d as not supported", lun, ctrl->device->GetId());
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// Signal that the requested LUN does not exist
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ctrl->buffer[0] |= 0x7f;
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}
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controller->DataIn();
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}
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void PrimaryDevice::ReportLuns(SASIDEV *controller)
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{
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BYTE *buf = ctrl->buffer;
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if (!CheckReady()) {
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controller->Error();
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return;
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}
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int allocation_length = (ctrl->cmd[6] << 24) + (ctrl->cmd[7] << 16) + (ctrl->cmd[8] << 8) + ctrl->cmd[9];
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memset(buf, 0, allocation_length);
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// Count number of available LUNs for the current device
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int luns;
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for (luns = 0; luns < controller->GetCtrl()->device->GetSupportedLuns(); luns++) {
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if (!controller->GetCtrl()->unit[luns]) {
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break;
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}
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}
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// LUN list length, 8 bytes per LUN
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// SCSI standard: The contents of the LUN LIST LENGTH field are not altered based on the allocation length
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buf[0] = (luns * 8) >> 24;
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buf[1] = (luns * 8) >> 16;
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buf[2] = (luns * 8) >> 8;
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buf[3] = luns * 8;
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ctrl->length = allocation_length < 8 + luns * 8 ? allocation_length : 8 + luns * 8;
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controller->DataIn();
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}
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void PrimaryDevice::RequestSense(SASIDEV *controller)
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{
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int lun = controller->GetEffectiveLun();
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// Note: According to the SCSI specs the LUN handling for REQUEST SENSE non-existing LUNs do *not* result
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// in CHECK CONDITION. Only the Sense Key and ASC are set in order to signal the non-existing LUN.
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if (!ctrl->unit[lun]) {
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// LUN 0 can be assumed to be present (required to call RequestSense() below)
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lun = 0;
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controller->Error(ERROR_CODES::sense_key::ILLEGAL_REQUEST, ERROR_CODES::asc::INVALID_LUN);
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ctrl->status = 0x00;
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}
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ctrl->length = ((PrimaryDevice *)ctrl->unit[lun])->RequestSense(ctrl->cmd, ctrl->buffer);
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ASSERT(ctrl->length > 0);
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LOGTRACE("%s Status $%02X, Sense Key $%02X, ASC $%02X",__PRETTY_FUNCTION__, ctrl->status, ctrl->buffer[2], ctrl->buffer[12]);
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controller->DataIn();
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}
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bool PrimaryDevice::CheckReady()
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{
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// Not ready if reset
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if (IsReset()) {
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SetStatusCode(STATUS_DEVRESET);
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SetReset(false);
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LOGTRACE("%s Disk in reset", __PRETTY_FUNCTION__);
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return false;
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}
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// Not ready if it needs attention
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if (IsAttn()) {
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SetStatusCode(STATUS_ATTENTION);
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SetAttn(false);
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LOGTRACE("%s Disk in needs attention", __PRETTY_FUNCTION__);
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return false;
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}
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// Return status if not ready
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if (!IsReady()) {
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SetStatusCode(STATUS_NOTREADY);
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LOGTRACE("%s Disk not ready", __PRETTY_FUNCTION__);
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return false;
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}
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// Initialization with no error
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LOGTRACE("%s Disk is ready", __PRETTY_FUNCTION__);
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return true;
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}
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int PrimaryDevice::Inquiry(int type, int scsi_level, bool is_removable, const DWORD *cdb, BYTE *buf)
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{
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int allocation_length = cdb[4] + (((DWORD)cdb[3]) << 8);
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if (allocation_length > 4) {
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if (allocation_length > 44) {
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allocation_length = 44;
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}
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// Basic data
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// buf[0] ... SCSI Device type
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// buf[1] ... Bit 7: Removable/not removable
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// buf[2] ... SCSI-2 compliant command system
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// buf[3] ... SCSI-2 compliant Inquiry response
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// buf[4] ... Inquiry additional data
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memset(buf, 0, allocation_length);
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buf[0] = type;
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buf[1] = is_removable ? 0x80 : 0x00;
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buf[2] = scsi_level;
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buf[4] = 0x1F;
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// Padded vendor, product, revision
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memcpy(&buf[8], GetPaddedName().c_str(), 28);
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}
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return allocation_length;
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}
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int PrimaryDevice::RequestSense(const DWORD *cdb, BYTE *buf)
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{
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ASSERT(cdb);
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ASSERT(buf);
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// Return not ready only if there are no errors
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if (GetStatusCode() == STATUS_NOERROR) {
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if (!IsReady()) {
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SetStatusCode(STATUS_NOTREADY);
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}
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}
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// Size determination (according to allocation length)
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int size = (int)cdb[4];
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ASSERT((size >= 0) && (size < 0x100));
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// For SCSI-1, transfer 4 bytes when the size is 0
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// (Deleted this specification for SCSI-2)
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if (size == 0) {
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size = 4;
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}
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// Clear the buffer
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memset(buf, 0, size);
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// Set 18 bytes including extended sense data
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// Current error
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buf[0] = 0x70;
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buf[2] = (BYTE)(GetStatusCode() >> 16);
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buf[7] = 10;
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buf[12] = (BYTE)(GetStatusCode() >> 8);
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buf[13] = (BYTE)GetStatusCode();
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return size;
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}
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bool PrimaryDevice::WriteBytes(BYTE *buf, uint32_t length)
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{
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LOGERROR("%s Writing bytes is not supported by this device", __PRETTY_FUNCTION__);
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return false;
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}
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