2 * FreeRTOS Kernel V10.2.0
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3 * Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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28 /* Standard includes. */
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29 #include <arm_cmse.h>
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32 /* Device includes. */
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33 #include "NuMicro.h"
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34 #include "partition_M2351.h"
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36 /* FreeRTOS includes. */
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37 #include "secure_port_macros.h"
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39 /* Start address of non-secure application. */
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40 #define mainNONSECURE_APP_START_ADDRESS ( 0x10040000 )
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42 /* typedef for non-secure Reset Handler. */
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43 typedef __cmse_nonsecure_call void ( *NonSecureResetHandler_t )( void );
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44 /*-----------------------------------------------------------*/
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47 * @brief Sets up the hardware - clocks and UARTs.
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49 static void prvSetupHardware( void );
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52 * @brief Boots into the non-secure code.
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54 * @param[in] ulNonSecureStartAddress Start address of the non-secure application.
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56 static void prvBootNonSecure( uint32_t ulNonSecureStartAddress );
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57 /*-----------------------------------------------------------*/
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59 static void prvSetupHardware( void )
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61 /* Init System Clock. */
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63 CLK->PLLCTL = CLK_PLLCTL_64MHz_HIRC;
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64 /* Wait for PLL to be stable. */
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65 while( ( CLK->STATUS & CLK_STATUS_PLLSTB_Msk ) == 0 );
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67 /* Set HCLK divider to 1. */
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68 CLK->CLKDIV0 = ( CLK->CLKDIV0 & ( ~CLK_CLKDIV0_HCLKDIV_Msk ) );
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70 /* Switch HCLK clock source to PLL. */
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71 CLK->CLKSEL0 = ( CLK->CLKSEL0 & ( ~CLK_CLKSEL0_HCLKSEL_Msk ) ) | CLK_CLKSEL0_HCLKSEL_PLL;
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73 /* Initialize UART0 - It is used for debug output from the non-secure side. */
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74 /* Enable UART0 clock. */
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75 CLK->APBCLK0 |= CLK_APBCLK0_UART0CKEN_Msk;
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77 /* Select UART0 clock source. */
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78 CLK->CLKSEL1 = ( CLK->CLKSEL1 & ( ~CLK_CLKSEL1_UART0SEL_Msk ) ) | CLK_CLKSEL1_UART0SEL_HIRC;
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80 /* Set multi-function pins for UART0 RXD and TXD. */
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81 SYS->GPB_MFPH = ( SYS->GPB_MFPH & ( ~UART0_RXD_PB12_Msk ) ) | UART0_RXD_PB12;
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82 SYS->GPB_MFPH = ( SYS->GPB_MFPH & ( ~UART0_TXD_PB13_Msk ) ) | UART0_TXD_PB13;
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84 /* Initialize UART1 - It is used for debug output from the secure side. */
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85 /* Enable UART1 clock. */
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86 CLK->APBCLK0 |= CLK_APBCLK0_UART1CKEN_Msk;
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88 /* Select UART1 clock source. */
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89 CLK->CLKSEL1 = ( CLK->CLKSEL1 & ( ~CLK_CLKSEL1_UART1SEL_Msk ) ) | CLK_CLKSEL1_UART1SEL_HIRC;
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91 /* Set multi-function pins for UART1 RXD and TXD. */
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92 SYS->GPA_MFPL = ( SYS->GPA_MFPL & ( ~UART1_RXD_PA2_Msk ) ) | UART1_RXD_PA2;
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93 SYS->GPA_MFPL = ( SYS->GPA_MFPL & ( ~UART1_TXD_PA3_Msk ) ) | UART1_TXD_PA3;
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95 /* Update System Core Clock. */
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96 PllClock = 64000000; /* PLL. */
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97 SystemCoreClock = 64000000 / 1; /* HCLK. */
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98 CyclesPerUs = 64000000 / 1000000; /* For SYS_SysTickDelay(). */
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100 /* Initialize the debug port. */
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101 DEBUG_PORT->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HIRC, 115200);
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102 DEBUG_PORT->LINE = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
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104 /*-----------------------------------------------------------*/
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106 static void prvBootNonSecure( uint32_t ulNonSecureStartAddress )
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108 NonSecureResetHandler_t pxNonSecureResetHandler;
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110 /* Setup the non-secure vector table. */
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111 SCB_NS->VTOR = ulNonSecureStartAddress;
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113 /* Main Stack Pointer value for the non-secure side is the first entry in
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114 * the non-secure vector table. Read the first entry and assign the same to
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115 * the non-secure main stack pointer(MSP_NS). */
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116 secureportSET_MSP_NS( *( ( uint32_t * )( ulNonSecureStartAddress ) ) );
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118 /* Reset Handler for the non-secure side is the second entry in the
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119 * non-secure vector table. Read the second entry to get the non-secure
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120 * Reset Handler. */
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121 pxNonSecureResetHandler = ( NonSecureResetHandler_t )( * ( ( uint32_t * ) ( ( ulNonSecureStartAddress ) + 4U ) ) );
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123 /* Start non-secure state software application by jumping to the non-secure
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124 * Reset Handler. */
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125 pxNonSecureResetHandler();
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127 /*-----------------------------------------------------------*/
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132 /* Unlock protected registers. */
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135 /* Initialize the hardware. */
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136 prvSetupHardware();
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138 /* Print banner. */
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140 printf( "+---------------------------------------------+\n" );
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141 printf( "| Secure is running ... |\n" );
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142 printf( "+---------------------------------------------+\n" );
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144 /* Do not generate Systick interrupt on secure side. */
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145 SysTick_Config( 1 );
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147 /* Set GPIO Port A to non-secure for controlling LEDs from the non-secure
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149 SCU_SET_IONSSET( SCU_IONSSET_PA_Msk );
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151 /* Set UART0 to non-secure for debug output from non-secure side. */
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152 SCU_SET_PNSSET( UART0_Attr );
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154 /* Lock protected registers before booting non-secure code. */
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157 /* Boot the non-secure code. */
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158 printf( "Entering non-secure world ...\n" );
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159 prvBootNonSecure( mainNONSECURE_APP_START_ADDRESS );
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161 /* Non-secure software does not return, this code is not executed. */
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164 /* Should not reach here. */
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167 /*-----------------------------------------------------------*/
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