2 FreeRTOS.org V4.7.2 - 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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28 Please ensure to read the configuration and relevant port sections of the
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29 online documentation.
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31 +++ http://www.FreeRTOS.org +++
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32 Documentation, latest information, license and contact details.
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34 +++ http://www.SafeRTOS.com +++
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35 A version that is certified for use in safety critical systems.
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37 +++ http://www.OpenRTOS.com +++
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38 Commercial support, development, porting, licensing and training services.
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40 ***************************************************************************
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46 + Introduced usage of configKERNEL_INTERRUPT_PRIORITY macro to set the
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47 interrupt priority used by the kernel.
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50 #include <FreeRTOSConfig.h>
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52 /* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is
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53 defined. The value zero should also ensure backward compatibility.
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54 FreeRTOS.org versions prior to V4.3.0 did not include this definition. */
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55 #ifndef configKERNEL_INTERRUPT_PRIORITY
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56 #define configKERNEL_INTERRUPT_PRIORITY 0
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63 EXTERN vPortYieldFromISR
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64 EXTERN vPortSwitchContext
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65 EXTERN vPortIncrementTick
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66 EXTERN uxCriticalNesting
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71 PUBLIC xPortPendSVHandler
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72 PUBLIC xPortSysTickHandler
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73 PUBLIC vPortSetInterruptMask
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74 PUBLIC vPortClearInterruptMask
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81 /*-----------------------------------------------------------*/
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87 /*-----------------------------------------------------------*/
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92 /* Save the context into the TCB. */
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93 stmdb r0!, {r4-r11}
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95 ldr r1, =uxCriticalNesting
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96 ldr r2, =pxCurrentTCB
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104 bl vPortSwitchContext
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106 /* Restore the context. */
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107 ldr r1, =pxCurrentTCB
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110 ldmia r0!, {r1, r4-r11}
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111 ldr r2, =uxCriticalNesting
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114 orr r14, r14, #0xd
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115 /* Exit with interrupts in the state required by the task. */
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116 cbnz r1, sv_disable_interrupts
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119 sv_disable_interrupts:
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120 mov r1, #configKERNEL_INTERRUPT_PRIORITY
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125 /*-----------------------------------------------------------*/
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127 xPortSysTickHandler:
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128 /* Call the scheduler tick function. */
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130 bl vPortIncrementTick
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133 /* If using preemption, also force a context switch. */
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134 #if configUSE_PREEMPTION == 1
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136 bl vPortYieldFromISR
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140 /* Exit with interrupts in the correct state. */
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141 ldr r2, =uxCriticalNesting
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143 cbnz r2, tick_disable_interrupts
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146 tick_disable_interrupts:
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147 mov r1, #configKERNEL_INTERRUPT_PRIORITY
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152 /*-----------------------------------------------------------*/
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154 vPortSetInterruptMask:
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156 mov R0, #configKERNEL_INTERRUPT_PRIORITY
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162 /*-----------------------------------------------------------*/
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164 vPortClearInterruptMask:
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172 /*-----------------------------------------------------------*/
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