ScsiController.h

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
#ifndef SCSICONTROLLER_H
#define SCSICONTROLLER_H
 
#include "pedigree/kernel/compiler.h"
#include "pedigree/kernel/machine/Controller.h"
#include "pedigree/kernel/process/OperationBarrier.h"
#include "pedigree/kernel/processor/types.h"
#include "pedigree/kernel/utilities/RequestQueue.h"
 
#define SCSI_REQUEST_READ 1
#define SCSI_REQUEST_WRITE 2
#define SCSI_REQUEST_SYNC 3
#define SCSI_REQUEST_WRITE_DIRECT 4
#define SCSI_REQUEST_PAGING 5
 
class ScsiDisk;
 
class EXPORTED_PUBLIC ScsiController : public Controller, public RequestQueue {
 public:
  ScsiController(Controller* pDev, bool startWorker = true);
  ScsiController();
 
  virtual ~ScsiController();
  bool prepareDiskRemoval();
  void cancelDiskRemoval();
 
  virtual bool supportsConcurrentReads() const {
    return false;
  }
 
  virtual bool sendCommand(size_t nUnit, uintptr_t pCommand, uint8_t nCommandSize,
                           uintptr_t pRespBuffer, uint16_t nRespBytes, bool bWrite) = 0;
 
  virtual uint64_t executeRequest(uint64_t p1, uint64_t p2, uint64_t p3, uint64_t p4, uint64_t p5,
                                  uint64_t p6, uint64_t p7, uint64_t p8);
 
 protected:
  virtual void cancelRequest(const Request& request);
 
  void shutdownDiskCaches(bool deviceAvailable = true);
 
  virtual size_t getNumUnits() = 0;
 
  void searchDisks();
 
 private:
  friend class ScsiDisk;
 
  bool acquireDiskOperation(OperationBarrier::Lease& operation);
 
  OperationBarrier m_DiskOperations;
};
 
#endif