2 ; * FreeRTOS Kernel V10.2.1
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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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31 .ref vTaskSwitchContext
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32 .ref ulMaxSyscallInterruptPriority
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34 .def xPortPendSVHandler
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36 .def vPortSVCHandler
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37 .def vPortStartFirstTask
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39 NVICOffsetConst: .word 0xE000ED08
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40 CPACRConst: .word 0xE000ED88
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41 pxCurrentTCBConst: .word pxCurrentTCB
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42 ulMaxSyscallInterruptPriorityConst: .word ulMaxSyscallInterruptPriority
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44 ; -----------------------------------------------------------
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47 ulPortGetIPSR: .asmfunc
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51 ; -----------------------------------------------------------
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54 vPortSetInterruptMask: .asmfunc
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56 ldr r0, ulMaxSyscallInterruptPriorityConst
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61 ; -----------------------------------------------------------
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64 xPortPendSVHandler: .asmfunc
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68 ;/* Get the location of the current TCB. */
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69 ldr r3, pxCurrentTCBConst
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72 ;/* Save the core registers. */
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75 ;/* Save the new top of stack into the first member of the TCB. */
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78 stmdb sp!, {r3, r14}
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79 ldr r0, ulMaxSyscallInterruptPriorityConst
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84 bl vTaskSwitchContext
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87 ldmia sp!, {r3, r14}
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89 ;/* The first item in pxCurrentTCB is the task top of stack. */
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93 ;/* Pop the core registers. */
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101 ; -----------------------------------------------------------
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104 vPortSVCHandler: .asmfunc
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105 ;/* Get the location of the current TCB. */
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106 ldr r3, pxCurrentTCBConst
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109 ;/* Pop the core registers. */
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110 ldmia r0!, {r4-r11}
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119 ; -----------------------------------------------------------
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122 vPortStartFirstTask: .asmfunc
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123 ;/* Use the NVIC offset register to locate the stack. */
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124 ldr r0, NVICOffsetConst
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127 ;/* Set the msp back to the start of the stack. */
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129 ;/* Clear the bit that indicates the FPU is in use in case the FPU was used
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130 ;before the scheduler was started - which would otherwise result in the
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131 ;unnecessary leaving of space in the SVC stack for lazy saving of FPU
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135 ;/* Call SVC to start the first task. */
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143 ; -----------------------------------------------------------
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