2 * FreeRTOS Kernel V10.6.2
3 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5 * SPDX-License-Identifier: MIT
7 * Permission is hereby granted, free of charge, to any person obtaining a copy of
8 * this software and associated documentation files (the "Software"), to deal in
9 * the Software without restriction, including without limitation the rights to
10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
11 * the Software, and to permit persons to whom the Software is furnished to do so,
12 * subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in all
15 * copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
19 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 * https://www.FreeRTOS.org
25 * https://github.com/FreeRTOS
29 #ifndef __SECURE_CONTEXT_H__
30 #define __SECURE_CONTEXT_H__
32 /* Standard includes. */
35 /* FreeRTOS includes. */
36 #include "FreeRTOSConfig.h"
39 * @brief PSP value when no secure context is loaded.
41 #define securecontextNO_STACK 0x0
44 * @brief Invalid context ID.
46 #define securecontextINVALID_CONTEXT_ID 0UL
47 /*-----------------------------------------------------------*/
50 * @brief Structure to represent a secure context.
52 * @note Since stack grows down, pucStackStart is the highest address while
53 * pucStackLimit is the first address of the allocated memory.
55 typedef struct SecureContext
57 uint8_t * pucCurrentStackPointer; /**< Current value of stack pointer (PSP). */
58 uint8_t * pucStackLimit; /**< Last location of the stack memory (PSPLIM). */
59 uint8_t * pucStackStart; /**< First location of the stack memory. */
60 void * pvTaskHandle; /**< Task handle of the task this context is associated with. */
62 /*-----------------------------------------------------------*/
65 * @brief Opaque handle for a secure context.
67 typedef uint32_t SecureContextHandle_t;
68 /*-----------------------------------------------------------*/
71 * @brief Initializes the secure context management system.
73 * PSP is set to NULL and therefore a task must allocate and load a context
74 * before calling any secure side function in the thread mode.
76 * @note This function must be called in the handler mode. It is no-op if called
79 void SecureContext_Init( void );
82 * @brief Allocates a context on the secure side.
84 * @note This function must be called in the handler mode. It is no-op if called
87 * @param[in] ulSecureStackSize Size of the stack to allocate on secure side.
88 * @param[in] ulIsTaskPrivileged 1 if the calling task is privileged, 0 otherwise.
90 * @return Opaque context handle if context is successfully allocated, NULL
93 #if ( configENABLE_MPU == 1 )
94 SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize,
95 uint32_t ulIsTaskPrivileged,
96 void * pvTaskHandle );
97 #else /* configENABLE_MPU */
98 SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize,
99 void * pvTaskHandle );
100 #endif /* configENABLE_MPU */
103 * @brief Frees the given context.
105 * @note This function must be called in the handler mode. It is no-op if called
106 * in the thread mode.
108 * @param[in] xSecureContextHandle Context handle corresponding to the
109 * context to be freed.
111 void SecureContext_FreeContext( SecureContextHandle_t xSecureContextHandle, void * pvTaskHandle );
114 * @brief Loads the given context.
116 * @note This function must be called in the handler mode. It is no-op if called
117 * in the thread mode.
119 * @param[in] xSecureContextHandle Context handle corresponding to the context
122 void SecureContext_LoadContext( SecureContextHandle_t xSecureContextHandle, void * pvTaskHandle );
125 * @brief Saves the given context.
127 * @note This function must be called in the handler mode. It is no-op if called
128 * in the thread mode.
130 * @param[in] xSecureContextHandle Context handle corresponding to the context
133 void SecureContext_SaveContext( SecureContextHandle_t xSecureContextHandle, void * pvTaskHandle );
135 #endif /* __SECURE_CONTEXT_H__ */