/*
 * Copyright (c) 2015-2016 ARM Limited. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the License); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * ----------------------------------------------------------------------------
 *
 * $Date:        21. September 2016
 * $Revision:    V1.0
 *
 * Project:      TrustZone for ARMv8-M
 * Title:        Context Management for ARMv8-M TrustZone
 *
 * Version 1.0
 *    Initial Release
 *---------------------------------------------------------------------------*/

#ifndef TZ_CONTEXT_H
#define TZ_CONTEXT_H

#include <stdint.h>

#ifndef TZ_MODULEID_T
    #define TZ_MODULEID_T
    /// \details Data type that identifies secure software modules called by a process.
    typedef uint32_t TZ_ModuleId_t;
#endif

/// \details TZ Memory ID identifies an allocated memory slot.
typedef uint32_t TZ_MemoryId_t;

/// Initialize secure context memory system
/// \return execution status (1: success, 0: error)
uint32_t TZ_InitContextSystem_S(void);

/// Allocate context memory for calling secure software modules in TrustZone
/// \param[in]  module   identifies software modules called from non-secure mode
/// \return value != 0 id TrustZone memory slot identifier
/// \return value 0    no memory available or internal error
TZ_MemoryId_t TZ_AllocModuleContext_S(TZ_ModuleId_t module);

/// Free context memory that was previously allocated with \ref TZ_AllocModuleContext_S
/// \param[in]  id  TrustZone memory slot identifier
/// \return execution status (1: success, 0: error)
uint32_t TZ_FreeModuleContext_S(TZ_MemoryId_t id);

/// Load secure context (called on RTOS thread context switch)
/// \param[in]  id  TrustZone memory slot identifier
/// \return execution status (1: success, 0: error)
uint32_t TZ_LoadContext_S(TZ_MemoryId_t id);

/// Store secure context (called on RTOS thread context switch)
/// \param[in]  id  TrustZone memory slot identifier
/// \return execution status (1: success, 0: error)
uint32_t TZ_StoreContext_S(TZ_MemoryId_t id);

#endif  // TZ_CONTEXT_H