mirror of https://github.com/akuker/RASCSI.git
179 lines
4.3 KiB
C++
179 lines
4.3 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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// 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 "log.h"
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#include "controllers/scsidev_ctrl.h"
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#include "mode_page_device.h"
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using namespace std;
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using namespace scsi_defs;
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ModePageDevice::ModePageDevice(const string& id) : PrimaryDevice(id)
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{
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dispatcher.AddCommand(eCmdModeSense6, "ModeSense6", &ModePageDevice::ModeSense6);
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dispatcher.AddCommand(eCmdModeSense10, "ModeSense10", &ModePageDevice::ModeSense10);
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dispatcher.AddCommand(eCmdModeSelect6, "ModeSelect6", &ModePageDevice::ModeSelect6);
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dispatcher.AddCommand(eCmdModeSelect10, "ModeSelect10", &ModePageDevice::ModeSelect10);
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}
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bool ModePageDevice::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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int ModePageDevice::AddModePages(const DWORD *cdb, BYTE *buf, int max_length)
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{
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bool changeable = (cdb[2] & 0xc0) == 0x40;
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// Get page code (0x3f means all pages)
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int page = cdb[2] & 0x3f;
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LOGTRACE("%s Requesting mode page $%02X", __PRETTY_FUNCTION__, page);
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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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AddModePages(pages, page, changeable);
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// If no mode data were added at all something must be wrong
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if (pages.empty()) {
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LOGTRACE("%s Unsupported mode page $%02X", __PRETTY_FUNCTION__, page);
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SetStatusCode(STATUS_INVALIDCDB);
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return 0;
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}
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int size = 0;
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vector<BYTE> page0;
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for (auto const& page : pages) {
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if (size + (int)page.second.size() > max_length) {
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LOGWARN("Mode page data size exceeds reserved buffer size");
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page0.clear();
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break;
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}
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else {
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// The specification mandates that page 0 must be returned after all others
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if (page.first) {
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// Page data
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memcpy(&buf[size], page.second.data(), page.second.size());
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// Page code, PS bit may already have been set
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buf[size] |= page.first;
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// Page payload size
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buf[size + 1] = page.second.size() - 2;
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size += page.second.size();
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}
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else {
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page0 = page.second;
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}
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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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memcpy(&buf[size], page0.data(), page0.size());
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// Page payload size
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buf[size + 1] = page0.size() - 2;
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size += page0.size();
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}
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return size;
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}
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void ModePageDevice::ModeSense6(SASIDEV *controller)
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{
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ctrl->length = ModeSense6(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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controller->DataIn();
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}
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void ModePageDevice::ModeSense10(SASIDEV *controller)
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{
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ctrl->length = ModeSense10(ctrl->cmd, ctrl->buffer, ctrl->bufsize);
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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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controller->DataIn();
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}
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bool ModePageDevice::ModeSelect(const DWORD*, const BYTE *, int)
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{
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// Cannot be set
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SetStatusCode(STATUS_INVALIDPRM);
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return false;
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}
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void ModePageDevice::ModeSelect6(SASIDEV *controller)
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{
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LOGTRACE("%s Unsupported mode page $%02X", __PRETTY_FUNCTION__, ctrl->buffer[0]);
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ctrl->length = ModeSelectCheck6();
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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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controller->DataOut();
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}
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void ModePageDevice::ModeSelect10(SASIDEV *controller)
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{
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LOGTRACE("%s Unsupported mode page $%02X", __PRETTY_FUNCTION__, ctrl->buffer[0]);
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ctrl->length = ModeSelectCheck10();
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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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controller->DataOut();
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}
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int ModePageDevice::ModeSelectCheck(int length)
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{
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// Error if save parameters are set for other types than of SCHD or SCRM
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// TODO The assumption above is not correct, and this code should be located elsewhere
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if (!IsSCSIHD() && (ctrl->cmd[1] & 0x01)) {
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SetStatusCode(STATUS_INVALIDCDB);
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return 0;
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}
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return length;
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}
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int ModePageDevice::ModeSelectCheck6()
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{
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// Receive the data specified by the parameter length
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return ModeSelectCheck(ctrl->cmd[4]);
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}
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int ModePageDevice::ModeSelectCheck10()
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{
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// Receive the data specified by the parameter length
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int length = ctrl->cmd[7];
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length <<= 8;
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length |= ctrl->cmd[8];
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if (length > ctrl->bufsize) {
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length = ctrl->bufsize;
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}
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return ModeSelectCheck(length);
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}
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