2 FreeRTOS.org V5.0.2 - Copyright (C) 2003-2008 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 ***************************************************************************
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29 * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
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30 * and even write all or part of your application on your behalf. *
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31 * See http://www.OpenRTOS.com for details of the services we provide to *
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32 * expedite your project. *
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34 ***************************************************************************
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35 ***************************************************************************
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37 Please ensure to read the configuration and relevant port sections of the
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38 online documentation.
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40 http://www.FreeRTOS.org - Documentation, latest information, license and
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43 http://www.SafeRTOS.com - A version that is certified for use in safety
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46 http://www.OpenRTOS.com - Commercial support, development, porting,
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47 licensing and training services.
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53 + Introduced usage of configKERNEL_INTERRUPT_PRIORITY macro to set the
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54 interrupt priority used by the kernel.
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57 #include <FreeRTOSConfig.h>
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59 /* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is
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60 defined. The value zero should also ensure backward compatibility.
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61 FreeRTOS.org versions prior to V4.3.0 did not include this definition. */
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62 #ifndef configKERNEL_INTERRUPT_PRIORITY
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63 #define configKERNEL_INTERRUPT_PRIORITY 0
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70 EXTERN vPortYieldFromISR
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71 EXTERN uxCriticalNesting
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73 EXTERN vTaskSwitchContext
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76 PUBLIC xPortPendSVHandler
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77 PUBLIC vPortSetInterruptMask
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78 PUBLIC vPortClearInterruptMask
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79 PUBLIC vPortSVCHandler
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80 PUBLIC vPortStartFirstTask
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83 /*-----------------------------------------------------------*/
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89 /*-----------------------------------------------------------*/
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93 ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */
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96 ldr r1, =uxCriticalNesting /* Save the remaining registers and the critical nesting count onto the task stack. */
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98 stmdb r0!, {r1,r4-r11}
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99 str r0, [r2] /* Save the new top of stack into the first member of the TCB. */
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101 stmdb sp!, {r3, r14}
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102 bl vTaskSwitchContext
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103 ldmia sp!, {r3, r14}
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106 ldr r2, =uxCriticalNesting
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107 ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */
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108 ldmia r0!, {r1, r4-r11} /* Pop the registers and the critical nesting count. */
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109 str r1, [r2] /* Save the new critical nesting value into ulCriticalNesting. */
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113 cbnz r1, sv_disable_interrupts /* If the nesting count is greater than 0 we need to exit with interrupts masked. */
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116 sv_disable_interrupts:
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117 mov r1, #configKERNEL_INTERRUPT_PRIORITY
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121 /*-----------------------------------------------------------*/
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123 vPortSetInterruptMask:
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125 mov R0, #configKERNEL_INTERRUPT_PRIORITY
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131 /*-----------------------------------------------------------*/
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133 vPortClearInterruptMask:
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141 /*-----------------------------------------------------------*/
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144 ldr r3, =pxCurrentTCB
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147 ldmia r0!, {r1, r4-r11}
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148 ldr r2, =uxCriticalNesting
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156 /*-----------------------------------------------------------*/
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158 vPortStartFirstTask
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