mirror of https://github.com/akuker/RASCSI.git
145 lines
4.0 KiB
C++
145 lines
4.0 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) 2022 Uwe Seimet
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//
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// A basic device with mode page support, to be used for subclassing
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//
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//---------------------------------------------------------------------------
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#include "shared/piscsi_exceptions.h"
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#include "scsi_command_util.h"
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#include "mode_page_device.h"
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#include <cstddef>
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#include <sstream>
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#include <iomanip>
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using namespace std;
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using namespace scsi_defs;
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using namespace scsi_command_util;
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bool ModePageDevice::Init(const unordered_map<string, string>& params)
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{
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PrimaryDevice::Init(params);
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AddCommand(scsi_command::eCmdModeSense6, [this] { ModeSense6(); });
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AddCommand(scsi_command::eCmdModeSense10, [this] { ModeSense10(); });
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AddCommand(scsi_command::eCmdModeSelect6, [this] { ModeSelect6(); });
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AddCommand(scsi_command::eCmdModeSelect10, [this] { ModeSelect10(); });
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return true;
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}
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int ModePageDevice::AddModePages(const vector<int>& cdb, vector<uint8_t>& buf, int offset, int length, int max_size) const
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{
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const int max_length = length - offset;
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if (max_length < 0) {
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return length;
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}
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const bool changeable = (cdb[2] & 0xc0) == 0x40;
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// Get page code (0x3f means all pages)
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const int page = cdb[2] & 0x3f;
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stringstream s;
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s << "Requesting mode page $" << setfill('0') << setw(2) << hex << page;
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GetLogger().Trace(s.str());
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// Mode page data mapped to the respective page numbers, C++ maps are ordered by key
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map<int, vector<byte>> pages;
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SetUpModePages(pages, page, changeable);
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if (pages.empty()) {
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s << "Unsupported mode page $" << page;
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GetLogger().Trace(s.str());
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throw scsi_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_FIELD_IN_CDB);
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}
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// Holds all mode page data
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vector<byte> result;
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vector<byte> page0;
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for (const auto& [index, data] : pages) {
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// The specification mandates that page 0 must be returned after all others
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if (index) {
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const size_t off = result.size();
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// Page data
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result.insert(result.end(), data.begin(), data.end());
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// Page code, PS bit may already have been set
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result[off] |= (byte)index;
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// Page payload size
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result[off + 1] = (byte)(data.size() - 2);
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}
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else {
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page0 = data;
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}
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}
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// Page 0 must be last
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if (!page0.empty()) {
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const size_t off = result.size();
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// Page data
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result.insert(result.end(), page0.begin(), page0.end());
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// Page payload size
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result[off + 1] = (byte)(page0.size() - 2);
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}
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if (static_cast<int>(result.size()) > max_size) {
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throw scsi_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_FIELD_IN_CDB);
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}
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const auto size = static_cast<int>(min(static_cast<size_t>(max_length), result.size()));
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memcpy(&buf.data()[offset], result.data(), size);
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// Do not return more than the requested number of bytes
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return size + offset < length ? size + offset : length;
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}
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void ModePageDevice::ModeSense6() const
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{
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GetController()->SetLength(ModeSense6(GetController()->GetCmd(), GetController()->GetBuffer()));
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EnterDataInPhase();
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}
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void ModePageDevice::ModeSense10() const
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{
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GetController()->SetLength(ModeSense10(GetController()->GetCmd(), GetController()->GetBuffer()));
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EnterDataInPhase();
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}
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void ModePageDevice::ModeSelect(scsi_command, const vector<int>&, const vector<uint8_t>&, int) const
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{
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// There is no default implementation of MDOE SELECT
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throw scsi_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_COMMAND_OPERATION_CODE);
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}
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void ModePageDevice::ModeSelect6() const
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{
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SaveParametersCheck(GetController()->GetCmd(4));
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}
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void ModePageDevice::ModeSelect10() const
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{
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const auto length = min(GetController()->GetBuffer().size(), static_cast<size_t>(GetInt16(GetController()->GetCmd(), 7)));
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SaveParametersCheck(static_cast<uint32_t>(length));
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}
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void ModePageDevice::SaveParametersCheck(int length) const
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{
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if (!SupportsSaveParameters() && (GetController()->GetCmd(1) & 0x01)) {
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throw scsi_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_FIELD_IN_CDB);
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}
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GetController()->SetLength(length);
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EnterDataOutPhase();
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}
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