xref: /hardware/samsung_slsi/exynos5/mobicore/daemon/Daemon/Device/Platforms/Generic/TrustZoneDevice.h

/** @addtogroup MCD_MCDIMPL_DAEMON_DEV
 * @{
 * @file
 *
 * Class for TrustZone Devices.
 * TrustZone device implements communication functions needed for
 * accessing MobiCore located in an TrustZone environment.
 *
 * <!-- Copyright Giesecke & Devrient GmbH 2009 - 2012 -->
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef TRUSTZONEDEVICE_H_
#define TRUSTZONEDEVICE_H_


#include <stdint.h>

#include "McTypes.h"

#include "CSemaphore.h"
#include "CMcKMod.h"
#include "CWsm.h"

#include "ExcDevice.h"
#include "MobiCoreDevice.h"


#define SCHEDULING_FREQ     5   /**< N-SIQ every n-th time */

class TrustZoneDevice : public MobiCoreDevice
{

protected:
    bool         schedulerEnabled; /**< NQ IRQ Scheduler enabling */
    CSemaphore   schedSync; /**< Semaphore to synchronize S-SIQs with scheduler thread */
    CMcKMod_ptr  pMcKMod; /**< kernel module */
    CWsm_ptr     pWsmMcp; /**< WSM use for MCP */
    CWsm_ptr     mobicoreInDDR;  /**< WSM used for Mobicore binary */

    /** Access functions to the MC Linux kernel module
     */
    bool yield(void);

    bool nsiq(void);

    bool waitSsiq(void);

public:

    TrustZoneDevice(void);

    virtual ~TrustZoneDevice(void);

//  static MobiCoreDevice* getDeviceInstance(
//      void
//  );
    /** Set up MCI and wait till MC is initialized
     *
     * @param devFile the device node to speak to.
     * @param loadMobiCore
     * @param mobicoreImage
     * @param enableScheduler
     *
     * @return true if mobicore is initialized
     * @trows ExcDevice
     */
    bool initDevice(
        const char  *devFile,
        bool        loadMobiCore,
        const char  *mobicoreImage,
        bool        enableScheduler
    );

    void initDeviceStep2(void);

    void notify(uint32_t sessionId);

    void dumpMobicoreStatus(void);

    uint32_t getMobicoreStatus(void);

    bool checkMciVersion(void);

    /** Memory allocation functions */
    bool getMciInstance(uint32_t len, CWsm_ptr *mci, bool *reused);

    //bool freeWsm(CWsm_ptr pWsm);

    CWsm_ptr registerWsmL2(addr_t buffer, uint32_t len, uint32_t pid);

    bool unregisterWsmL2(CWsm_ptr pWsm);

    bool lockWsmL2(uint32_t handle);

    bool unlockWsmL2(uint32_t handle);

    addr_t findWsmL2(uint32_t handle);

    bool findContiguousWsm(uint32_t handle, addr_t *phys, uint32_t *len);

    /**
     * Cleanup all orphaned bulk buffers.
     */
    bool cleanupWsmL2(void);

    /**
     * Allocates persistent WSM memory for TL (won't be fried when TLC exits).
     */
    CWsm_ptr allocateContiguousPersistentWsm(uint32_t len);

    bool schedulerAvailable(void);

    void schedule(void);

    void handleIrq(void);
};

#endif /* TRUSTZONEDEVICE_H_ */

/** @} */