2 * FreeRTOS Kernel <DEVELOPMENT BRANCH>
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3 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * SPDX-License-Identifier: MIT
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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8 * this software and associated documentation files (the "Software"), to deal in
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9 * the Software without restriction, including without limitation the rights to
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10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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11 * the Software, and to permit persons to whom the Software is furnished to do so,
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12 * subject to the following conditions:
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14 * The above copyright notice and this permission notice shall be included in all
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15 * copies or substantial portions of the Software.
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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19 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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20 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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21 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24 * https://www.FreeRTOS.org
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25 * https://github.com/FreeRTOS
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29 #ifndef __SECURE_CONTEXT_H__
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30 #define __SECURE_CONTEXT_H__
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32 /* Standard includes. */
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35 /* FreeRTOS includes. */
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36 #include "FreeRTOSConfig.h"
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39 * @brief PSP value when no secure context is loaded.
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41 #define securecontextNO_STACK 0x0
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42 /*-----------------------------------------------------------*/
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45 * @brief Structure to represent a secure context.
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47 * @note Since stack grows down, pucStackStart is the highest address while
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48 * pucStackLimit is the first address of the allocated memory.
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50 typedef struct SecureContext
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52 uint8_t * pucCurrentStackPointer; /**< Current value of stack pointer (PSP). */
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53 uint8_t * pucStackLimit; /**< Last location of the stack memory (PSPLIM). */
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54 uint8_t * pucStackStart; /**< First location of the stack memory. */
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56 /*-----------------------------------------------------------*/
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59 * @brief Opaque handle for a secure context.
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61 typedef uint32_t SecureContextHandle_t;
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62 /*-----------------------------------------------------------*/
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65 * @brief Initializes the secure context management system.
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67 * PSP is set to NULL and therefore a task must allocate and load a context
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68 * before calling any secure side function in the thread mode.
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70 * @note This function must be called in the handler mode. It is no-op if called
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71 * in the thread mode.
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73 void SecureContext_Init( void );
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76 * @brief Allocates a context on the secure side.
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78 * @note This function must be called in the handler mode. It is no-op if called
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79 * in the thread mode.
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81 * @param[in] ulSecureStackSize Size of the stack to allocate on secure side.
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82 * @param[in] ulIsTaskPrivileged 1 if the calling task is privileged, 0 otherwise.
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84 * @return Opaque context handle if context is successfully allocated, NULL
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87 #if ( configENABLE_MPU == 1 )
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88 SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize,
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89 uint32_t ulIsTaskPrivileged );
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90 #else /* configENABLE_MPU */
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91 SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize );
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92 #endif /* configENABLE_MPU */
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95 * @brief Frees the given context.
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97 * @note This function must be called in the handler mode. It is no-op if called
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98 * in the thread mode.
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100 * @param[in] xSecureContextHandle Context handle corresponding to the
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101 * context to be freed.
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103 void SecureContext_FreeContext( SecureContextHandle_t xSecureContextHandle );
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106 * @brief Loads the given context.
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108 * @note This function must be called in the handler mode. It is no-op if called
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109 * in the thread mode.
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111 * @param[in] xSecureContextHandle Context handle corresponding to the context
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114 void SecureContext_LoadContext( SecureContextHandle_t xSecureContextHandle );
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117 * @brief Saves the given context.
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119 * @note This function must be called in the handler mode. It is no-op if called
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120 * in the thread mode.
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122 * @param[in] xSecureContextHandle Context handle corresponding to the context
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125 void SecureContext_SaveContext( SecureContextHandle_t xSecureContextHandle );
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127 #endif /* __SECURE_CONTEXT_H__ */
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