2 * FreeRTOS Kernel V10.4.5
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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 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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30 * all the API functions to use the MPU wrappers. That should only be done when
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31 * task.h is included from an application file. */
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32 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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34 /* Scheduler includes. */
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35 #include "FreeRTOS.h"
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38 /* MPU wrappers includes. */
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39 #include "mpu_wrappers.h"
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41 /* Portasm includes. */
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42 #include "portasm.h"
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44 #if ( configENABLE_TRUSTZONE == 1 )
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45 /* Secure components includes. */
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46 #include "secure_context.h"
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47 #include "secure_init.h"
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48 #endif /* configENABLE_TRUSTZONE */
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50 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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53 * The FreeRTOS Cortex M33 port can be configured to run on the Secure Side only
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54 * i.e. the processor boots as secure and never jumps to the non-secure side.
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55 * The Trust Zone support in the port must be disabled in order to run FreeRTOS
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56 * on the secure side. The following are the valid configuration seetings:
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58 * 1. Run FreeRTOS on the Secure Side:
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59 * configRUN_FREERTOS_SECURE_ONLY = 1 and configENABLE_TRUSTZONE = 0
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61 * 2. Run FreeRTOS on the Non-Secure Side with Secure Side function call support:
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62 * configRUN_FREERTOS_SECURE_ONLY = 0 and configENABLE_TRUSTZONE = 1
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64 * 3. Run FreeRTOS on the Non-Secure Side only i.e. no Secure Side function call support:
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65 * configRUN_FREERTOS_SECURE_ONLY = 0 and configENABLE_TRUSTZONE = 0
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67 #if ( ( configRUN_FREERTOS_SECURE_ONLY == 1 ) && ( configENABLE_TRUSTZONE == 1 ) )
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68 #error TrustZone needs to be disabled in order to run FreeRTOS on the Secure Side.
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70 /*-----------------------------------------------------------*/
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73 * @brief Constants required to manipulate the NVIC.
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75 #define portNVIC_SYSTICK_CTRL_REG ( *( ( volatile uint32_t * ) 0xe000e010 ) )
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76 #define portNVIC_SYSTICK_LOAD_REG ( *( ( volatile uint32_t * ) 0xe000e014 ) )
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77 #define portNVIC_SYSTICK_CURRENT_VALUE_REG ( *( ( volatile uint32_t * ) 0xe000e018 ) )
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78 #define portNVIC_SHPR3_REG ( *( ( volatile uint32_t * ) 0xe000ed20 ) )
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79 #define portNVIC_SYSTICK_ENABLE_BIT ( 1UL << 0UL )
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80 #define portNVIC_SYSTICK_INT_BIT ( 1UL << 1UL )
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81 #define portNVIC_SYSTICK_COUNT_FLAG_BIT ( 1UL << 16UL )
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82 #define portMIN_INTERRUPT_PRIORITY ( 255UL )
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83 #define portNVIC_PENDSV_PRI ( portMIN_INTERRUPT_PRIORITY << 16UL )
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84 #define portNVIC_SYSTICK_PRI ( portMIN_INTERRUPT_PRIORITY << 24UL )
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85 #ifndef configSYSTICK_CLOCK_HZ
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86 #define configSYSTICK_CLOCK_HZ configCPU_CLOCK_HZ
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87 /* Ensure the SysTick is clocked at the same frequency as the core. */
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88 #define portNVIC_SYSTICK_CLK_BIT ( 1UL << 2UL )
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91 /* The way the SysTick is clocked is not modified in case it is not the
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92 * same a the core. */
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93 #define portNVIC_SYSTICK_CLK_BIT ( 0 )
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95 /*-----------------------------------------------------------*/
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98 * @brief Constants required to manipulate the SCB.
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100 #define portSCB_SYS_HANDLER_CTRL_STATE_REG ( *( volatile uint32_t * ) 0xe000ed24 )
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101 #define portSCB_MEM_FAULT_ENABLE_BIT ( 1UL << 16UL )
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102 /*-----------------------------------------------------------*/
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105 * @brief Constants required to manipulate the FPU.
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107 #define portCPACR ( ( volatile uint32_t * ) 0xe000ed88 ) /* Coprocessor Access Control Register. */
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108 #define portCPACR_CP10_VALUE ( 3UL )
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109 #define portCPACR_CP11_VALUE portCPACR_CP10_VALUE
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110 #define portCPACR_CP10_POS ( 20UL )
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111 #define portCPACR_CP11_POS ( 22UL )
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113 #define portFPCCR ( ( volatile uint32_t * ) 0xe000ef34 ) /* Floating Point Context Control Register. */
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114 #define portFPCCR_ASPEN_POS ( 31UL )
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115 #define portFPCCR_ASPEN_MASK ( 1UL << portFPCCR_ASPEN_POS )
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116 #define portFPCCR_LSPEN_POS ( 30UL )
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117 #define portFPCCR_LSPEN_MASK ( 1UL << portFPCCR_LSPEN_POS )
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118 /*-----------------------------------------------------------*/
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121 * @brief Constants required to manipulate the MPU.
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123 #define portMPU_TYPE_REG ( *( ( volatile uint32_t * ) 0xe000ed90 ) )
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124 #define portMPU_CTRL_REG ( *( ( volatile uint32_t * ) 0xe000ed94 ) )
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125 #define portMPU_RNR_REG ( *( ( volatile uint32_t * ) 0xe000ed98 ) )
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127 #define portMPU_RBAR_REG ( *( ( volatile uint32_t * ) 0xe000ed9c ) )
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128 #define portMPU_RLAR_REG ( *( ( volatile uint32_t * ) 0xe000eda0 ) )
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130 #define portMPU_RBAR_A1_REG ( *( ( volatile uint32_t * ) 0xe000eda4 ) )
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131 #define portMPU_RLAR_A1_REG ( *( ( volatile uint32_t * ) 0xe000eda8 ) )
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133 #define portMPU_RBAR_A2_REG ( *( ( volatile uint32_t * ) 0xe000edac ) )
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134 #define portMPU_RLAR_A2_REG ( *( ( volatile uint32_t * ) 0xe000edb0 ) )
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136 #define portMPU_RBAR_A3_REG ( *( ( volatile uint32_t * ) 0xe000edb4 ) )
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137 #define portMPU_RLAR_A3_REG ( *( ( volatile uint32_t * ) 0xe000edb8 ) )
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139 #define portMPU_MAIR0_REG ( *( ( volatile uint32_t * ) 0xe000edc0 ) )
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140 #define portMPU_MAIR1_REG ( *( ( volatile uint32_t * ) 0xe000edc4 ) )
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142 #define portMPU_RBAR_ADDRESS_MASK ( 0xffffffe0 ) /* Must be 32-byte aligned. */
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143 #define portMPU_RLAR_ADDRESS_MASK ( 0xffffffe0 ) /* Must be 32-byte aligned. */
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145 #define portMPU_MAIR_ATTR0_POS ( 0UL )
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146 #define portMPU_MAIR_ATTR0_MASK ( 0x000000ff )
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148 #define portMPU_MAIR_ATTR1_POS ( 8UL )
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149 #define portMPU_MAIR_ATTR1_MASK ( 0x0000ff00 )
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151 #define portMPU_MAIR_ATTR2_POS ( 16UL )
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152 #define portMPU_MAIR_ATTR2_MASK ( 0x00ff0000 )
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154 #define portMPU_MAIR_ATTR3_POS ( 24UL )
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155 #define portMPU_MAIR_ATTR3_MASK ( 0xff000000 )
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157 #define portMPU_MAIR_ATTR4_POS ( 0UL )
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158 #define portMPU_MAIR_ATTR4_MASK ( 0x000000ff )
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160 #define portMPU_MAIR_ATTR5_POS ( 8UL )
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161 #define portMPU_MAIR_ATTR5_MASK ( 0x0000ff00 )
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163 #define portMPU_MAIR_ATTR6_POS ( 16UL )
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164 #define portMPU_MAIR_ATTR6_MASK ( 0x00ff0000 )
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166 #define portMPU_MAIR_ATTR7_POS ( 24UL )
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167 #define portMPU_MAIR_ATTR7_MASK ( 0xff000000 )
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169 #define portMPU_RLAR_ATTR_INDEX0 ( 0UL << 1UL )
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170 #define portMPU_RLAR_ATTR_INDEX1 ( 1UL << 1UL )
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171 #define portMPU_RLAR_ATTR_INDEX2 ( 2UL << 1UL )
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172 #define portMPU_RLAR_ATTR_INDEX3 ( 3UL << 1UL )
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173 #define portMPU_RLAR_ATTR_INDEX4 ( 4UL << 1UL )
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174 #define portMPU_RLAR_ATTR_INDEX5 ( 5UL << 1UL )
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175 #define portMPU_RLAR_ATTR_INDEX6 ( 6UL << 1UL )
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176 #define portMPU_RLAR_ATTR_INDEX7 ( 7UL << 1UL )
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178 #define portMPU_RLAR_REGION_ENABLE ( 1UL )
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180 /* Enable privileged access to unmapped region. */
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181 #define portMPU_PRIV_BACKGROUND_ENABLE_BIT ( 1UL << 2UL )
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184 #define portMPU_ENABLE_BIT ( 1UL << 0UL )
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186 /* Expected value of the portMPU_TYPE register. */
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187 #define portEXPECTED_MPU_TYPE_VALUE ( 8UL << 8UL ) /* 8 regions, unified. */
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188 /*-----------------------------------------------------------*/
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191 * @brief The maximum 24-bit number.
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193 * It is needed because the systick is a 24-bit counter.
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195 #define portMAX_24_BIT_NUMBER ( 0xffffffUL )
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198 * @brief A fiddle factor to estimate the number of SysTick counts that would
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199 * have occurred while the SysTick counter is stopped during tickless idle
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202 #define portMISSED_COUNTS_FACTOR ( 45UL )
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203 /*-----------------------------------------------------------*/
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206 * @brief Constants required to set up the initial stack.
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208 #define portINITIAL_XPSR ( 0x01000000 )
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210 #if ( configRUN_FREERTOS_SECURE_ONLY == 1 )
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213 * @brief Initial EXC_RETURN value.
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216 * 1111 1111 1111 1111 1111 1111 1111 1101
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218 * Bit[6] - 1 --> The exception was taken from the Secure state.
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219 * Bit[5] - 1 --> Do not skip stacking of additional state context.
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220 * Bit[4] - 1 --> The PE did not allocate space on the stack for FP context.
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221 * Bit[3] - 1 --> Return to the Thread mode.
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222 * Bit[2] - 1 --> Restore registers from the process stack.
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223 * Bit[1] - 0 --> Reserved, 0.
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224 * Bit[0] - 1 --> The exception was taken to the Secure state.
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226 #define portINITIAL_EXC_RETURN ( 0xfffffffd )
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230 * @brief Initial EXC_RETURN value.
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233 * 1111 1111 1111 1111 1111 1111 1011 1100
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235 * Bit[6] - 0 --> The exception was taken from the Non-Secure state.
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236 * Bit[5] - 1 --> Do not skip stacking of additional state context.
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237 * Bit[4] - 1 --> The PE did not allocate space on the stack for FP context.
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238 * Bit[3] - 1 --> Return to the Thread mode.
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239 * Bit[2] - 1 --> Restore registers from the process stack.
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240 * Bit[1] - 0 --> Reserved, 0.
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241 * Bit[0] - 0 --> The exception was taken to the Non-Secure state.
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243 #define portINITIAL_EXC_RETURN ( 0xffffffbc )
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244 #endif /* configRUN_FREERTOS_SECURE_ONLY */
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247 * @brief CONTROL register privileged bit mask.
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249 * Bit[0] in CONTROL register tells the privilege:
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250 * Bit[0] = 0 ==> The task is privileged.
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251 * Bit[0] = 1 ==> The task is not privileged.
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253 #define portCONTROL_PRIVILEGED_MASK ( 1UL << 0UL )
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256 * @brief Initial CONTROL register values.
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258 #define portINITIAL_CONTROL_UNPRIVILEGED ( 0x3 )
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259 #define portINITIAL_CONTROL_PRIVILEGED ( 0x2 )
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262 * @brief Let the user override the pre-loading of the initial LR with the
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263 * address of prvTaskExitError() in case it messes up unwinding of the stack
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266 #ifdef configTASK_RETURN_ADDRESS
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267 #define portTASK_RETURN_ADDRESS configTASK_RETURN_ADDRESS
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269 #define portTASK_RETURN_ADDRESS prvTaskExitError
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273 * @brief If portPRELOAD_REGISTERS then registers will be given an initial value
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274 * when a task is created. This helps in debugging at the cost of code size.
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276 #define portPRELOAD_REGISTERS 1
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279 * @brief A task is created without a secure context, and must call
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280 * portALLOCATE_SECURE_CONTEXT() to give itself a secure context before it makes
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281 * any secure calls.
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283 #define portNO_SECURE_CONTEXT 0
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284 /*-----------------------------------------------------------*/
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287 * @brief Used to catch tasks that attempt to return from their implementing
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290 static void prvTaskExitError( void );
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292 #if ( configENABLE_MPU == 1 )
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295 * @brief Setup the Memory Protection Unit (MPU).
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297 static void prvSetupMPU( void ) PRIVILEGED_FUNCTION;
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298 #endif /* configENABLE_MPU */
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300 #if ( configENABLE_FPU == 1 )
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303 * @brief Setup the Floating Point Unit (FPU).
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305 static void prvSetupFPU( void ) PRIVILEGED_FUNCTION;
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306 #endif /* configENABLE_FPU */
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309 * @brief Setup the timer to generate the tick interrupts.
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311 * The implementation in this file is weak to allow application writers to
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312 * change the timer used to generate the tick interrupt.
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314 void vPortSetupTimerInterrupt( void ) PRIVILEGED_FUNCTION;
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317 * @brief Checks whether the current execution context is interrupt.
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319 * @return pdTRUE if the current execution context is interrupt, pdFALSE
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322 BaseType_t xPortIsInsideInterrupt( void );
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325 * @brief Yield the processor.
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327 void vPortYield( void ) PRIVILEGED_FUNCTION;
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330 * @brief Enter critical section.
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332 void vPortEnterCritical( void ) PRIVILEGED_FUNCTION;
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335 * @brief Exit from critical section.
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337 void vPortExitCritical( void ) PRIVILEGED_FUNCTION;
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340 * @brief SysTick handler.
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342 void SysTick_Handler( void ) PRIVILEGED_FUNCTION;
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345 * @brief C part of SVC handler.
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347 portDONT_DISCARD void vPortSVCHandler_C( uint32_t * pulCallerStackAddress ) PRIVILEGED_FUNCTION;
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348 /*-----------------------------------------------------------*/
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351 * @brief Each task maintains its own interrupt status in the critical nesting
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354 PRIVILEGED_DATA static volatile uint32_t ulCriticalNesting = 0xaaaaaaaaUL;
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356 #if ( configENABLE_TRUSTZONE == 1 )
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359 * @brief Saved as part of the task context to indicate which context the
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360 * task is using on the secure side.
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362 PRIVILEGED_DATA portDONT_DISCARD volatile SecureContextHandle_t xSecureContext = portNO_SECURE_CONTEXT;
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363 #endif /* configENABLE_TRUSTZONE */
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365 #if ( configUSE_TICKLESS_IDLE == 1 )
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368 * @brief The number of SysTick increments that make up one tick period.
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370 PRIVILEGED_DATA static uint32_t ulTimerCountsForOneTick = 0;
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373 * @brief The maximum number of tick periods that can be suppressed is
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374 * limited by the 24 bit resolution of the SysTick timer.
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376 PRIVILEGED_DATA static uint32_t xMaximumPossibleSuppressedTicks = 0;
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379 * @brief Compensate for the CPU cycles that pass while the SysTick is
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380 * stopped (low power functionality only).
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382 PRIVILEGED_DATA static uint32_t ulStoppedTimerCompensation = 0;
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383 #endif /* configUSE_TICKLESS_IDLE */
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384 /*-----------------------------------------------------------*/
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386 #if ( configUSE_TICKLESS_IDLE == 1 )
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387 __attribute__( ( weak ) ) void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime )
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389 uint32_t ulReloadValue, ulCompleteTickPeriods, ulCompletedSysTickDecrements;
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390 TickType_t xModifiableIdleTime;
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392 /* Make sure the SysTick reload value does not overflow the counter. */
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393 if( xExpectedIdleTime > xMaximumPossibleSuppressedTicks )
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395 xExpectedIdleTime = xMaximumPossibleSuppressedTicks;
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398 /* Stop the SysTick momentarily. The time the SysTick is stopped for is
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399 * accounted for as best it can be, but using the tickless mode will
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400 * inevitably result in some tiny drift of the time maintained by the
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401 * kernel with respect to calendar time. */
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402 portNVIC_SYSTICK_CTRL_REG &= ~portNVIC_SYSTICK_ENABLE_BIT;
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404 /* Calculate the reload value required to wait xExpectedIdleTime
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405 * tick periods. -1 is used because this code will execute part way
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406 * through one of the tick periods. */
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407 ulReloadValue = portNVIC_SYSTICK_CURRENT_VALUE_REG + ( ulTimerCountsForOneTick * ( xExpectedIdleTime - 1UL ) );
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409 if( ulReloadValue > ulStoppedTimerCompensation )
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411 ulReloadValue -= ulStoppedTimerCompensation;
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414 /* Enter a critical section but don't use the taskENTER_CRITICAL()
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415 * method as that will mask interrupts that should exit sleep mode. */
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416 __asm volatile ( "cpsid i" ::: "memory" );
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417 __asm volatile ( "dsb" );
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418 __asm volatile ( "isb" );
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420 /* If a context switch is pending or a task is waiting for the scheduler
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421 * to be un-suspended then abandon the low power entry. */
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422 if( eTaskConfirmSleepModeStatus() == eAbortSleep )
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424 /* Restart from whatever is left in the count register to complete
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425 * this tick period. */
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426 portNVIC_SYSTICK_LOAD_REG = portNVIC_SYSTICK_CURRENT_VALUE_REG;
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428 /* Restart SysTick. */
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429 portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
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431 /* Reset the reload register to the value required for normal tick
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433 portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
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435 /* Re-enable interrupts - see comments above the cpsid instruction()
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437 __asm volatile ( "cpsie i" ::: "memory" );
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441 /* Set the new reload value. */
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442 portNVIC_SYSTICK_LOAD_REG = ulReloadValue;
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444 /* Clear the SysTick count flag and set the count value back to
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446 portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
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448 /* Restart SysTick. */
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449 portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
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451 /* Sleep until something happens. configPRE_SLEEP_PROCESSING() can
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452 * set its parameter to 0 to indicate that its implementation
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453 * contains its own wait for interrupt or wait for event
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454 * instruction, and so wfi should not be executed again. However,
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455 * the original expected idle time variable must remain unmodified,
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456 * so a copy is taken. */
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457 xModifiableIdleTime = xExpectedIdleTime;
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458 configPRE_SLEEP_PROCESSING( xModifiableIdleTime );
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460 if( xModifiableIdleTime > 0 )
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462 __asm volatile ( "dsb" ::: "memory" );
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463 __asm volatile ( "wfi" );
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464 __asm volatile ( "isb" );
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467 configPOST_SLEEP_PROCESSING( xExpectedIdleTime );
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469 /* Re-enable interrupts to allow the interrupt that brought the MCU
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470 * out of sleep mode to execute immediately. See comments above
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471 * the cpsid instruction above. */
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472 __asm volatile ( "cpsie i" ::: "memory" );
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473 __asm volatile ( "dsb" );
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474 __asm volatile ( "isb" );
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476 /* Disable interrupts again because the clock is about to be stopped
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477 * and interrupts that execute while the clock is stopped will
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478 * increase any slippage between the time maintained by the RTOS and
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479 * calendar time. */
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480 __asm volatile ( "cpsid i" ::: "memory" );
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481 __asm volatile ( "dsb" );
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482 __asm volatile ( "isb" );
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484 /* Disable the SysTick clock without reading the
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485 * portNVIC_SYSTICK_CTRL_REG register to ensure the
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486 * portNVIC_SYSTICK_COUNT_FLAG_BIT is not cleared if it is set.
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487 * Again, the time the SysTick is stopped for is accounted for as
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488 * best it can be, but using the tickless mode will inevitably
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489 * result in some tiny drift of the time maintained by the kernel
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490 * with respect to calendar time*/
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491 portNVIC_SYSTICK_CTRL_REG = ( portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT );
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493 /* Determine if the SysTick clock has already counted to zero and
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494 * been set back to the current reload value (the reload back being
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495 * correct for the entire expected idle time) or if the SysTick is
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496 * yet to count to zero (in which case an interrupt other than the
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497 * SysTick must have brought the system out of sleep mode). */
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498 if( ( portNVIC_SYSTICK_CTRL_REG & portNVIC_SYSTICK_COUNT_FLAG_BIT ) != 0 )
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500 uint32_t ulCalculatedLoadValue;
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502 /* The tick interrupt is already pending, and the SysTick count
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503 * reloaded with ulReloadValue. Reset the
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504 * portNVIC_SYSTICK_LOAD_REG with whatever remains of this tick
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506 ulCalculatedLoadValue = ( ulTimerCountsForOneTick - 1UL ) - ( ulReloadValue - portNVIC_SYSTICK_CURRENT_VALUE_REG );
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508 /* Don't allow a tiny value, or values that have somehow
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509 * underflowed because the post sleep hook did something
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510 * that took too long. */
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511 if( ( ulCalculatedLoadValue < ulStoppedTimerCompensation ) || ( ulCalculatedLoadValue > ulTimerCountsForOneTick ) )
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513 ulCalculatedLoadValue = ( ulTimerCountsForOneTick - 1UL );
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516 portNVIC_SYSTICK_LOAD_REG = ulCalculatedLoadValue;
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518 /* As the pending tick will be processed as soon as this
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519 * function exits, the tick value maintained by the tick is
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520 * stepped forward by one less than the time spent waiting. */
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521 ulCompleteTickPeriods = xExpectedIdleTime - 1UL;
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525 /* Something other than the tick interrupt ended the sleep.
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526 * Work out how long the sleep lasted rounded to complete tick
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527 * periods (not the ulReload value which accounted for part
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529 ulCompletedSysTickDecrements = ( xExpectedIdleTime * ulTimerCountsForOneTick ) - portNVIC_SYSTICK_CURRENT_VALUE_REG;
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531 /* How many complete tick periods passed while the processor
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533 ulCompleteTickPeriods = ulCompletedSysTickDecrements / ulTimerCountsForOneTick;
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535 /* The reload value is set to whatever fraction of a single tick
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536 * period remains. */
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537 portNVIC_SYSTICK_LOAD_REG = ( ( ulCompleteTickPeriods + 1UL ) * ulTimerCountsForOneTick ) - ulCompletedSysTickDecrements;
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540 /* Restart SysTick so it runs from portNVIC_SYSTICK_LOAD_REG
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541 * again, then set portNVIC_SYSTICK_LOAD_REG back to its standard
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543 portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
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544 portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
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545 vTaskStepTick( ulCompleteTickPeriods );
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546 portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
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548 /* Exit with interrupts enabled. */
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549 __asm volatile ( "cpsie i" ::: "memory" );
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552 #endif /* configUSE_TICKLESS_IDLE */
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553 /*-----------------------------------------------------------*/
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555 __attribute__( ( weak ) ) void vPortSetupTimerInterrupt( void ) /* PRIVILEGED_FUNCTION */
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557 /* Calculate the constants required to configure the tick interrupt. */
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558 #if ( configUSE_TICKLESS_IDLE == 1 )
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560 ulTimerCountsForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ );
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561 xMaximumPossibleSuppressedTicks = portMAX_24_BIT_NUMBER / ulTimerCountsForOneTick;
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562 ulStoppedTimerCompensation = portMISSED_COUNTS_FACTOR / ( configCPU_CLOCK_HZ / configSYSTICK_CLOCK_HZ );
\r
564 #endif /* configUSE_TICKLESS_IDLE */
\r
566 /* Stop and reset the SysTick. */
\r
567 portNVIC_SYSTICK_CTRL_REG = 0UL;
\r
568 portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
\r
570 /* Configure SysTick to interrupt at the requested rate. */
\r
571 portNVIC_SYSTICK_LOAD_REG = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
\r
572 portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;
\r
574 /*-----------------------------------------------------------*/
\r
576 static void prvTaskExitError( void )
\r
578 volatile uint32_t ulDummy = 0UL;
\r
580 /* A function that implements a task must not exit or attempt to return to
\r
581 * its caller as there is nothing to return to. If a task wants to exit it
\r
582 * should instead call vTaskDelete( NULL ). Artificially force an assert()
\r
583 * to be triggered if configASSERT() is defined, then stop here so
\r
584 * application writers can catch the error. */
\r
585 configASSERT( ulCriticalNesting == ~0UL );
\r
586 portDISABLE_INTERRUPTS();
\r
588 while( ulDummy == 0 )
\r
590 /* This file calls prvTaskExitError() after the scheduler has been
\r
591 * started to remove a compiler warning about the function being
\r
592 * defined but never called. ulDummy is used purely to quieten other
\r
593 * warnings about code appearing after this function is called - making
\r
594 * ulDummy volatile makes the compiler think the function could return
\r
595 * and therefore not output an 'unreachable code' warning for code that
\r
596 * appears after it. */
\r
599 /*-----------------------------------------------------------*/
\r
601 #if ( configENABLE_MPU == 1 )
\r
602 static void prvSetupMPU( void ) /* PRIVILEGED_FUNCTION */
\r
604 #if defined( __ARMCC_VERSION )
\r
606 /* Declaration when these variable are defined in code instead of being
\r
607 * exported from linker scripts. */
\r
608 extern uint32_t * __privileged_functions_start__;
\r
609 extern uint32_t * __privileged_functions_end__;
\r
610 extern uint32_t * __syscalls_flash_start__;
\r
611 extern uint32_t * __syscalls_flash_end__;
\r
612 extern uint32_t * __unprivileged_flash_start__;
\r
613 extern uint32_t * __unprivileged_flash_end__;
\r
614 extern uint32_t * __privileged_sram_start__;
\r
615 extern uint32_t * __privileged_sram_end__;
\r
616 #else /* if defined( __ARMCC_VERSION ) */
\r
617 /* Declaration when these variable are exported from linker scripts. */
\r
618 extern uint32_t __privileged_functions_start__[];
\r
619 extern uint32_t __privileged_functions_end__[];
\r
620 extern uint32_t __syscalls_flash_start__[];
\r
621 extern uint32_t __syscalls_flash_end__[];
\r
622 extern uint32_t __unprivileged_flash_start__[];
\r
623 extern uint32_t __unprivileged_flash_end__[];
\r
624 extern uint32_t __privileged_sram_start__[];
\r
625 extern uint32_t __privileged_sram_end__[];
\r
626 #endif /* defined( __ARMCC_VERSION ) */
\r
628 /* Check that the MPU is present. */
\r
629 if( portMPU_TYPE_REG == portEXPECTED_MPU_TYPE_VALUE )
\r
631 /* MAIR0 - Index 0. */
\r
632 portMPU_MAIR0_REG |= ( ( portMPU_NORMAL_MEMORY_BUFFERABLE_CACHEABLE << portMPU_MAIR_ATTR0_POS ) & portMPU_MAIR_ATTR0_MASK );
\r
633 /* MAIR0 - Index 1. */
\r
634 portMPU_MAIR0_REG |= ( ( portMPU_DEVICE_MEMORY_nGnRE << portMPU_MAIR_ATTR1_POS ) & portMPU_MAIR_ATTR1_MASK );
\r
636 /* Setup privileged flash as Read Only so that privileged tasks can
\r
637 * read it but not modify. */
\r
638 portMPU_RNR_REG = portPRIVILEGED_FLASH_REGION;
\r
639 portMPU_RBAR_REG = ( ( ( uint32_t ) __privileged_functions_start__ ) & portMPU_RBAR_ADDRESS_MASK ) |
\r
640 ( portMPU_REGION_NON_SHAREABLE ) |
\r
641 ( portMPU_REGION_PRIVILEGED_READ_ONLY );
\r
642 portMPU_RLAR_REG = ( ( ( uint32_t ) __privileged_functions_end__ ) & portMPU_RLAR_ADDRESS_MASK ) |
\r
643 ( portMPU_RLAR_ATTR_INDEX0 ) |
\r
644 ( portMPU_RLAR_REGION_ENABLE );
\r
646 /* Setup unprivileged flash as Read Only by both privileged and
\r
647 * unprivileged tasks. All tasks can read it but no-one can modify. */
\r
648 portMPU_RNR_REG = portUNPRIVILEGED_FLASH_REGION;
\r
649 portMPU_RBAR_REG = ( ( ( uint32_t ) __unprivileged_flash_start__ ) & portMPU_RBAR_ADDRESS_MASK ) |
\r
650 ( portMPU_REGION_NON_SHAREABLE ) |
\r
651 ( portMPU_REGION_READ_ONLY );
\r
652 portMPU_RLAR_REG = ( ( ( uint32_t ) __unprivileged_flash_end__ ) & portMPU_RLAR_ADDRESS_MASK ) |
\r
653 ( portMPU_RLAR_ATTR_INDEX0 ) |
\r
654 ( portMPU_RLAR_REGION_ENABLE );
\r
656 /* Setup unprivileged syscalls flash as Read Only by both privileged
\r
657 * and unprivileged tasks. All tasks can read it but no-one can modify. */
\r
658 portMPU_RNR_REG = portUNPRIVILEGED_SYSCALLS_REGION;
\r
659 portMPU_RBAR_REG = ( ( ( uint32_t ) __syscalls_flash_start__ ) & portMPU_RBAR_ADDRESS_MASK ) |
\r
660 ( portMPU_REGION_NON_SHAREABLE ) |
\r
661 ( portMPU_REGION_READ_ONLY );
\r
662 portMPU_RLAR_REG = ( ( ( uint32_t ) __syscalls_flash_end__ ) & portMPU_RLAR_ADDRESS_MASK ) |
\r
663 ( portMPU_RLAR_ATTR_INDEX0 ) |
\r
664 ( portMPU_RLAR_REGION_ENABLE );
\r
666 /* Setup RAM containing kernel data for privileged access only. */
\r
667 portMPU_RNR_REG = portPRIVILEGED_RAM_REGION;
\r
668 portMPU_RBAR_REG = ( ( ( uint32_t ) __privileged_sram_start__ ) & portMPU_RBAR_ADDRESS_MASK ) |
\r
669 ( portMPU_REGION_NON_SHAREABLE ) |
\r
670 ( portMPU_REGION_PRIVILEGED_READ_WRITE ) |
\r
671 ( portMPU_REGION_EXECUTE_NEVER );
\r
672 portMPU_RLAR_REG = ( ( ( uint32_t ) __privileged_sram_end__ ) & portMPU_RLAR_ADDRESS_MASK ) |
\r
673 ( portMPU_RLAR_ATTR_INDEX0 ) |
\r
674 ( portMPU_RLAR_REGION_ENABLE );
\r
676 /* Enable mem fault. */
\r
677 portSCB_SYS_HANDLER_CTRL_STATE_REG |= portSCB_MEM_FAULT_ENABLE_BIT;
\r
679 /* Enable MPU with privileged background access i.e. unmapped
\r
680 * regions have privileged access. */
\r
681 portMPU_CTRL_REG |= ( portMPU_PRIV_BACKGROUND_ENABLE_BIT | portMPU_ENABLE_BIT );
\r
684 #endif /* configENABLE_MPU */
\r
685 /*-----------------------------------------------------------*/
\r
687 #if ( configENABLE_FPU == 1 )
\r
688 static void prvSetupFPU( void ) /* PRIVILEGED_FUNCTION */
\r
690 #if ( configENABLE_TRUSTZONE == 1 )
\r
692 /* Enable non-secure access to the FPU. */
\r
693 SecureInit_EnableNSFPUAccess();
\r
695 #endif /* configENABLE_TRUSTZONE */
\r
697 /* CP10 = 11 ==> Full access to FPU i.e. both privileged and
\r
698 * unprivileged code should be able to access FPU. CP11 should be
\r
699 * programmed to the same value as CP10. */
\r
700 *( portCPACR ) |= ( ( portCPACR_CP10_VALUE << portCPACR_CP10_POS ) |
\r
701 ( portCPACR_CP11_VALUE << portCPACR_CP11_POS )
\r
704 /* ASPEN = 1 ==> Hardware should automatically preserve floating point
\r
705 * context on exception entry and restore on exception return.
\r
706 * LSPEN = 1 ==> Enable lazy context save of FP state. */
\r
707 *( portFPCCR ) |= ( portFPCCR_ASPEN_MASK | portFPCCR_LSPEN_MASK );
\r
709 #endif /* configENABLE_FPU */
\r
710 /*-----------------------------------------------------------*/
\r
712 void vPortYield( void ) /* PRIVILEGED_FUNCTION */
\r
714 /* Set a PendSV to request a context switch. */
\r
715 portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
\r
717 /* Barriers are normally not required but do ensure the code is
\r
718 * completely within the specified behaviour for the architecture. */
\r
719 __asm volatile ( "dsb" ::: "memory" );
\r
720 __asm volatile ( "isb" );
\r
722 /*-----------------------------------------------------------*/
\r
724 void vPortEnterCritical( void ) /* PRIVILEGED_FUNCTION */
\r
726 portDISABLE_INTERRUPTS();
\r
727 ulCriticalNesting++;
\r
729 /* Barriers are normally not required but do ensure the code is
\r
730 * completely within the specified behaviour for the architecture. */
\r
731 __asm volatile ( "dsb" ::: "memory" );
\r
732 __asm volatile ( "isb" );
\r
734 /*-----------------------------------------------------------*/
\r
736 void vPortExitCritical( void ) /* PRIVILEGED_FUNCTION */
\r
738 configASSERT( ulCriticalNesting );
\r
739 ulCriticalNesting--;
\r
741 if( ulCriticalNesting == 0 )
\r
743 portENABLE_INTERRUPTS();
\r
746 /*-----------------------------------------------------------*/
\r
748 void SysTick_Handler( void ) /* PRIVILEGED_FUNCTION */
\r
750 uint32_t ulPreviousMask;
\r
752 ulPreviousMask = portSET_INTERRUPT_MASK_FROM_ISR();
\r
754 /* Increment the RTOS tick. */
\r
755 if( xTaskIncrementTick() != pdFALSE )
\r
757 /* Pend a context switch. */
\r
758 portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
\r
761 portCLEAR_INTERRUPT_MASK_FROM_ISR( ulPreviousMask );
\r
763 /*-----------------------------------------------------------*/
\r
765 void vPortSVCHandler_C( uint32_t * pulCallerStackAddress ) /* PRIVILEGED_FUNCTION portDONT_DISCARD */
\r
767 #if ( configENABLE_MPU == 1 )
\r
768 #if defined( __ARMCC_VERSION )
\r
770 /* Declaration when these variable are defined in code instead of being
\r
771 * exported from linker scripts. */
\r
772 extern uint32_t * __syscalls_flash_start__;
\r
773 extern uint32_t * __syscalls_flash_end__;
\r
775 /* Declaration when these variable are exported from linker scripts. */
\r
776 extern uint32_t __syscalls_flash_start__[];
\r
777 extern uint32_t __syscalls_flash_end__[];
\r
778 #endif /* defined( __ARMCC_VERSION ) */
\r
779 #endif /* configENABLE_MPU */
\r
783 #if ( configENABLE_TRUSTZONE == 1 )
\r
784 uint32_t ulR0, ulR1;
\r
785 extern TaskHandle_t pxCurrentTCB;
\r
786 #if ( configENABLE_MPU == 1 )
\r
787 uint32_t ulControl, ulIsTaskPrivileged;
\r
788 #endif /* configENABLE_MPU */
\r
789 #endif /* configENABLE_TRUSTZONE */
\r
790 uint8_t ucSVCNumber;
\r
792 /* Register are stored on the stack in the following order - R0, R1, R2, R3,
\r
793 * R12, LR, PC, xPSR. */
\r
794 ulPC = pulCallerStackAddress[ 6 ];
\r
795 ucSVCNumber = ( ( uint8_t * ) ulPC )[ -2 ];
\r
797 switch( ucSVCNumber )
\r
799 #if ( configENABLE_TRUSTZONE == 1 )
\r
800 case portSVC_ALLOCATE_SECURE_CONTEXT:
\r
802 /* R0 contains the stack size passed as parameter to the
\r
803 * vPortAllocateSecureContext function. */
\r
804 ulR0 = pulCallerStackAddress[ 0 ];
\r
806 #if ( configENABLE_MPU == 1 )
\r
808 /* Read the CONTROL register value. */
\r
809 __asm volatile ( "mrs %0, control" : "=r" ( ulControl ) );
\r
811 /* The task that raised the SVC is privileged if Bit[0]
\r
812 * in the CONTROL register is 0. */
\r
813 ulIsTaskPrivileged = ( ( ulControl & portCONTROL_PRIVILEGED_MASK ) == 0 );
\r
815 /* Allocate and load a context for the secure task. */
\r
816 xSecureContext = SecureContext_AllocateContext( ulR0, ulIsTaskPrivileged, pxCurrentTCB );
\r
818 #else /* if ( configENABLE_MPU == 1 ) */
\r
820 /* Allocate and load a context for the secure task. */
\r
821 xSecureContext = SecureContext_AllocateContext( ulR0, pxCurrentTCB );
\r
823 #endif /* configENABLE_MPU */
\r
825 configASSERT( xSecureContext != securecontextINVALID_CONTEXT_ID );
\r
826 SecureContext_LoadContext( xSecureContext, pxCurrentTCB );
\r
829 case portSVC_FREE_SECURE_CONTEXT:
\r
830 /* R0 contains TCB being freed and R1 contains the secure
\r
831 * context handle to be freed. */
\r
832 ulR0 = pulCallerStackAddress[ 0 ];
\r
833 ulR1 = pulCallerStackAddress[ 1 ];
\r
835 /* Free the secure context. */
\r
836 SecureContext_FreeContext( ( SecureContextHandle_t ) ulR1, ( void * ) ulR0 );
\r
838 #endif /* configENABLE_TRUSTZONE */
\r
840 case portSVC_START_SCHEDULER:
\r
841 #if ( configENABLE_TRUSTZONE == 1 )
\r
843 /* De-prioritize the non-secure exceptions so that the
\r
844 * non-secure pendSV runs at the lowest priority. */
\r
845 SecureInit_DePrioritizeNSExceptions();
\r
847 /* Initialize the secure context management system. */
\r
848 SecureContext_Init();
\r
850 #endif /* configENABLE_TRUSTZONE */
\r
852 #if ( configENABLE_FPU == 1 )
\r
854 /* Setup the Floating Point Unit (FPU). */
\r
857 #endif /* configENABLE_FPU */
\r
859 /* Setup the context of the first task so that the first task starts
\r
861 vRestoreContextOfFirstTask();
\r
864 #if ( configENABLE_MPU == 1 )
\r
865 case portSVC_RAISE_PRIVILEGE:
\r
867 /* Only raise the privilege, if the svc was raised from any of
\r
868 * the system calls. */
\r
869 if( ( ulPC >= ( uint32_t ) __syscalls_flash_start__ ) &&
\r
870 ( ulPC <= ( uint32_t ) __syscalls_flash_end__ ) )
\r
875 #endif /* configENABLE_MPU */
\r
878 /* Incorrect SVC call. */
\r
879 configASSERT( pdFALSE );
\r
882 /*-----------------------------------------------------------*/
\r
884 #if ( configENABLE_MPU == 1 )
\r
885 StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
\r
886 StackType_t * pxEndOfStack,
\r
887 TaskFunction_t pxCode,
\r
888 void * pvParameters,
\r
889 BaseType_t xRunPrivileged ) /* PRIVILEGED_FUNCTION */
\r
891 StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
\r
892 StackType_t * pxEndOfStack,
\r
893 TaskFunction_t pxCode,
\r
894 void * pvParameters ) /* PRIVILEGED_FUNCTION */
\r
895 #endif /* configENABLE_MPU */
\r
898 /* Simulate the stack frame as it would be created by a context switch
\r
900 #if ( portPRELOAD_REGISTERS == 0 )
\r
902 pxTopOfStack--; /* Offset added to account for the way the MCU uses the stack on entry/exit of interrupts. */
\r
903 *pxTopOfStack = portINITIAL_XPSR; /* xPSR */
\r
905 *pxTopOfStack = ( StackType_t ) pxCode; /* PC */
\r
907 *pxTopOfStack = ( StackType_t ) portTASK_RETURN_ADDRESS; /* LR */
\r
908 pxTopOfStack -= 5; /* R12, R3, R2 and R1. */
\r
909 *pxTopOfStack = ( StackType_t ) pvParameters; /* R0 */
\r
910 pxTopOfStack -= 9; /* R11..R4, EXC_RETURN. */
\r
911 *pxTopOfStack = portINITIAL_EXC_RETURN;
\r
913 #if ( configENABLE_MPU == 1 )
\r
917 if( xRunPrivileged == pdTRUE )
\r
919 *pxTopOfStack = portINITIAL_CONTROL_PRIVILEGED; /* Slot used to hold this task's CONTROL value. */
\r
923 *pxTopOfStack = portINITIAL_CONTROL_UNPRIVILEGED; /* Slot used to hold this task's CONTROL value. */
\r
926 #endif /* configENABLE_MPU */
\r
929 *pxTopOfStack = ( StackType_t ) pxEndOfStack; /* Slot used to hold this task's PSPLIM value. */
\r
931 #if ( configENABLE_TRUSTZONE == 1 )
\r
934 *pxTopOfStack = portNO_SECURE_CONTEXT; /* Slot used to hold this task's xSecureContext value. */
\r
936 #endif /* configENABLE_TRUSTZONE */
\r
938 #else /* portPRELOAD_REGISTERS */
\r
940 pxTopOfStack--; /* Offset added to account for the way the MCU uses the stack on entry/exit of interrupts. */
\r
941 *pxTopOfStack = portINITIAL_XPSR; /* xPSR */
\r
943 *pxTopOfStack = ( StackType_t ) pxCode; /* PC */
\r
945 *pxTopOfStack = ( StackType_t ) portTASK_RETURN_ADDRESS; /* LR */
\r
947 *pxTopOfStack = ( StackType_t ) 0x12121212UL; /* R12 */
\r
949 *pxTopOfStack = ( StackType_t ) 0x03030303UL; /* R3 */
\r
951 *pxTopOfStack = ( StackType_t ) 0x02020202UL; /* R2 */
\r
953 *pxTopOfStack = ( StackType_t ) 0x01010101UL; /* R1 */
\r
955 *pxTopOfStack = ( StackType_t ) pvParameters; /* R0 */
\r
957 *pxTopOfStack = ( StackType_t ) 0x11111111UL; /* R11 */
\r
959 *pxTopOfStack = ( StackType_t ) 0x10101010UL; /* R10 */
\r
961 *pxTopOfStack = ( StackType_t ) 0x09090909UL; /* R09 */
\r
963 *pxTopOfStack = ( StackType_t ) 0x08080808UL; /* R08 */
\r
965 *pxTopOfStack = ( StackType_t ) 0x07070707UL; /* R07 */
\r
967 *pxTopOfStack = ( StackType_t ) 0x06060606UL; /* R06 */
\r
969 *pxTopOfStack = ( StackType_t ) 0x05050505UL; /* R05 */
\r
971 *pxTopOfStack = ( StackType_t ) 0x04040404UL; /* R04 */
\r
973 *pxTopOfStack = portINITIAL_EXC_RETURN; /* EXC_RETURN */
\r
975 #if ( configENABLE_MPU == 1 )
\r
979 if( xRunPrivileged == pdTRUE )
\r
981 *pxTopOfStack = portINITIAL_CONTROL_PRIVILEGED; /* Slot used to hold this task's CONTROL value. */
\r
985 *pxTopOfStack = portINITIAL_CONTROL_UNPRIVILEGED; /* Slot used to hold this task's CONTROL value. */
\r
988 #endif /* configENABLE_MPU */
\r
991 *pxTopOfStack = ( StackType_t ) pxEndOfStack; /* Slot used to hold this task's PSPLIM value. */
\r
993 #if ( configENABLE_TRUSTZONE == 1 )
\r
996 *pxTopOfStack = portNO_SECURE_CONTEXT; /* Slot used to hold this task's xSecureContext value. */
\r
998 #endif /* configENABLE_TRUSTZONE */
\r
1000 #endif /* portPRELOAD_REGISTERS */
\r
1002 return pxTopOfStack;
\r
1004 /*-----------------------------------------------------------*/
\r
1006 BaseType_t xPortStartScheduler( void ) /* PRIVILEGED_FUNCTION */
\r
1008 /* Make PendSV, CallSV and SysTick the same priority as the kernel. */
\r
1009 portNVIC_SHPR3_REG |= portNVIC_PENDSV_PRI;
\r
1010 portNVIC_SHPR3_REG |= portNVIC_SYSTICK_PRI;
\r
1012 #if ( configENABLE_MPU == 1 )
\r
1014 /* Setup the Memory Protection Unit (MPU). */
\r
1017 #endif /* configENABLE_MPU */
\r
1019 /* Start the timer that generates the tick ISR. Interrupts are disabled
\r
1020 * here already. */
\r
1021 vPortSetupTimerInterrupt();
\r
1023 /* Initialize the critical nesting count ready for the first task. */
\r
1024 ulCriticalNesting = 0;
\r
1026 /* Start the first task. */
\r
1027 vStartFirstTask();
\r
1029 /* Should never get here as the tasks will now be executing. Call the task
\r
1030 * exit error function to prevent compiler warnings about a static function
\r
1031 * not being called in the case that the application writer overrides this
\r
1032 * functionality by defining configTASK_RETURN_ADDRESS. Call
\r
1033 * vTaskSwitchContext() so link time optimization does not remove the
\r
1035 vTaskSwitchContext();
\r
1036 prvTaskExitError();
\r
1038 /* Should not get here. */
\r
1041 /*-----------------------------------------------------------*/
\r
1043 void vPortEndScheduler( void ) /* PRIVILEGED_FUNCTION */
\r
1045 /* Not implemented in ports where there is nothing to return to.
\r
1046 * Artificially force an assert. */
\r
1047 configASSERT( ulCriticalNesting == 1000UL );
\r
1049 /*-----------------------------------------------------------*/
\r
1051 #if ( configENABLE_MPU == 1 )
\r
1052 void vPortStoreTaskMPUSettings( xMPU_SETTINGS * xMPUSettings,
\r
1053 const struct xMEMORY_REGION * const xRegions,
\r
1054 StackType_t * pxBottomOfStack,
\r
1055 uint32_t ulStackDepth )
\r
1057 uint32_t ulRegionStartAddress, ulRegionEndAddress, ulRegionNumber;
\r
1058 int32_t lIndex = 0;
\r
1060 #if defined( __ARMCC_VERSION )
\r
1062 /* Declaration when these variable are defined in code instead of being
\r
1063 * exported from linker scripts. */
\r
1064 extern uint32_t * __privileged_sram_start__;
\r
1065 extern uint32_t * __privileged_sram_end__;
\r
1067 /* Declaration when these variable are exported from linker scripts. */
\r
1068 extern uint32_t __privileged_sram_start__[];
\r
1069 extern uint32_t __privileged_sram_end__[];
\r
1070 #endif /* defined( __ARMCC_VERSION ) */
\r
1072 /* Setup MAIR0. */
\r
1073 xMPUSettings->ulMAIR0 = ( ( portMPU_NORMAL_MEMORY_BUFFERABLE_CACHEABLE << portMPU_MAIR_ATTR0_POS ) & portMPU_MAIR_ATTR0_MASK );
\r
1074 xMPUSettings->ulMAIR0 |= ( ( portMPU_DEVICE_MEMORY_nGnRE << portMPU_MAIR_ATTR1_POS ) & portMPU_MAIR_ATTR1_MASK );
\r
1076 /* This function is called automatically when the task is created - in
\r
1077 * which case the stack region parameters will be valid. At all other
\r
1078 * times the stack parameters will not be valid and it is assumed that
\r
1079 * the stack region has already been configured. */
\r
1080 if( ulStackDepth > 0 )
\r
1082 ulRegionStartAddress = ( uint32_t ) pxBottomOfStack;
\r
1083 ulRegionEndAddress = ( uint32_t ) pxBottomOfStack + ( ulStackDepth * ( uint32_t ) sizeof( StackType_t ) ) - 1;
\r
1085 /* If the stack is within the privileged SRAM, do not protect it
\r
1086 * using a separate MPU region. This is needed because privileged
\r
1087 * SRAM is already protected using an MPU region and ARMv8-M does
\r
1088 * not allow overlapping MPU regions. */
\r
1089 if( ( ulRegionStartAddress >= ( uint32_t ) __privileged_sram_start__ ) &&
\r
1090 ( ulRegionEndAddress <= ( uint32_t ) __privileged_sram_end__ ) )
\r
1092 xMPUSettings->xRegionsSettings[ 0 ].ulRBAR = 0;
\r
1093 xMPUSettings->xRegionsSettings[ 0 ].ulRLAR = 0;
\r
1097 /* Define the region that allows access to the stack. */
\r
1098 ulRegionStartAddress &= portMPU_RBAR_ADDRESS_MASK;
\r
1099 ulRegionEndAddress &= portMPU_RLAR_ADDRESS_MASK;
\r
1101 xMPUSettings->xRegionsSettings[ 0 ].ulRBAR = ( ulRegionStartAddress ) |
\r
1102 ( portMPU_REGION_NON_SHAREABLE ) |
\r
1103 ( portMPU_REGION_READ_WRITE ) |
\r
1104 ( portMPU_REGION_EXECUTE_NEVER );
\r
1106 xMPUSettings->xRegionsSettings[ 0 ].ulRLAR = ( ulRegionEndAddress ) |
\r
1107 ( portMPU_RLAR_ATTR_INDEX0 ) |
\r
1108 ( portMPU_RLAR_REGION_ENABLE );
\r
1112 /* User supplied configurable regions. */
\r
1113 for( ulRegionNumber = 1; ulRegionNumber <= portNUM_CONFIGURABLE_REGIONS; ulRegionNumber++ )
\r
1115 /* If xRegions is NULL i.e. the task has not specified any MPU
\r
1116 * region, the else part ensures that all the configurable MPU
\r
1117 * regions are invalidated. */
\r
1118 if( ( xRegions != NULL ) && ( xRegions[ lIndex ].ulLengthInBytes > 0UL ) )
\r
1120 /* Translate the generic region definition contained in xRegions
\r
1121 * into the ARMv8 specific MPU settings that are then stored in
\r
1122 * xMPUSettings. */
\r
1123 ulRegionStartAddress = ( ( uint32_t ) xRegions[ lIndex ].pvBaseAddress ) & portMPU_RBAR_ADDRESS_MASK;
\r
1124 ulRegionEndAddress = ( uint32_t ) xRegions[ lIndex ].pvBaseAddress + xRegions[ lIndex ].ulLengthInBytes - 1;
\r
1125 ulRegionEndAddress &= portMPU_RLAR_ADDRESS_MASK;
\r
1127 /* Start address. */
\r
1128 xMPUSettings->xRegionsSettings[ ulRegionNumber ].ulRBAR = ( ulRegionStartAddress ) |
\r
1129 ( portMPU_REGION_NON_SHAREABLE );
\r
1132 if( ( xRegions[ lIndex ].ulParameters & tskMPU_REGION_READ_ONLY ) != 0 )
\r
1134 xMPUSettings->xRegionsSettings[ ulRegionNumber ].ulRBAR |= ( portMPU_REGION_READ_ONLY );
\r
1138 xMPUSettings->xRegionsSettings[ ulRegionNumber ].ulRBAR |= ( portMPU_REGION_READ_WRITE );
\r
1142 if( ( xRegions[ lIndex ].ulParameters & tskMPU_REGION_EXECUTE_NEVER ) != 0 )
\r
1144 xMPUSettings->xRegionsSettings[ ulRegionNumber ].ulRBAR |= ( portMPU_REGION_EXECUTE_NEVER );
\r
1147 /* End Address. */
\r
1148 xMPUSettings->xRegionsSettings[ ulRegionNumber ].ulRLAR = ( ulRegionEndAddress ) |
\r
1149 ( portMPU_RLAR_REGION_ENABLE );
\r
1151 /* Normal memory/ Device memory. */
\r
1152 if( ( xRegions[ lIndex ].ulParameters & tskMPU_REGION_DEVICE_MEMORY ) != 0 )
\r
1154 /* Attr1 in MAIR0 is configured as device memory. */
\r
1155 xMPUSettings->xRegionsSettings[ ulRegionNumber ].ulRLAR |= portMPU_RLAR_ATTR_INDEX1;
\r
1159 /* Attr1 in MAIR0 is configured as normal memory. */
\r
1160 xMPUSettings->xRegionsSettings[ ulRegionNumber ].ulRLAR |= portMPU_RLAR_ATTR_INDEX0;
\r
1165 /* Invalidate the region. */
\r
1166 xMPUSettings->xRegionsSettings[ ulRegionNumber ].ulRBAR = 0UL;
\r
1167 xMPUSettings->xRegionsSettings[ ulRegionNumber ].ulRLAR = 0UL;
\r
1173 #endif /* configENABLE_MPU */
\r
1174 /*-----------------------------------------------------------*/
\r
1176 BaseType_t xPortIsInsideInterrupt( void )
\r
1178 uint32_t ulCurrentInterrupt;
\r
1179 BaseType_t xReturn;
\r
1181 /* Obtain the number of the currently executing interrupt. Interrupt Program
\r
1182 * Status Register (IPSR) holds the exception number of the currently-executing
\r
1183 * exception or zero for Thread mode.*/
\r
1184 __asm volatile ( "mrs %0, ipsr" : "=r" ( ulCurrentInterrupt )::"memory" );
\r
1186 if( ulCurrentInterrupt == 0 )
\r
1188 xReturn = pdFALSE;
\r
1197 /*-----------------------------------------------------------*/
\r