| ;/* |
| ; * FreeRTOS Kernel <DEVELOPMENT BRANCH> |
| ; * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| ; * |
| ; * SPDX-License-Identifier: MIT |
| ; * |
| ; * Permission is hereby granted, free of charge, to any person obtaining a copy of |
| ; * this software and associated documentation files (the "Software"), to deal in |
| ; * the Software without restriction, including without limitation the rights to |
| ; * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of |
| ; * the Software, and to permit persons to whom the Software is furnished to do so, |
| ; * subject to the following conditions: |
| ; * |
| ; * The above copyright notice and this permission notice shall be included in all |
| ; * copies or substantial portions of the Software. |
| ; * |
| ; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| ; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS |
| ; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR |
| ; * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
| ; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| ; * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| ; * |
| ; * https://www.FreeRTOS.org |
| ; * https://github.com/FreeRTOS |
| ; * |
| ; */ |
| |
| RSEG ICODE:CODE |
| CODE32 |
| |
| EXTERN vTaskSwitchContext |
| EXTERN vPortPreemptiveTick |
| |
| PUBLIC vPortPreemptiveTickEntry |
| PUBLIC vPortYieldProcessor |
| PUBLIC vPortStartFirstTask |
| |
| #include "FreeRTOSConfig.h" |
| #include "ISR_Support.h" |
| |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| ; Starting the first task is just a matter of restoring the context that |
| ; was created by pxPortInitialiseStack(). |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| vPortStartFirstTask: |
| portRESTORE_CONTEXT |
| |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| ; Manual context switch function. This is the SWI hander. |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| vPortYieldProcessor: |
| ADD LR, LR, #4 ; Add 4 to the LR to make the LR appear exactly |
| ; as if the context was saved during and IRQ |
| ; handler. |
| |
| portSAVE_CONTEXT ; Save the context of the current task... |
| LDR R0, =vTaskSwitchContext ; before selecting the next task to execute. |
| mov lr, pc |
| BX R0 |
| portRESTORE_CONTEXT ; Restore the context of the selected task. |
| |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| ; Preemptive context switch function. This will only ever get installed if |
| ; portUSE_PREEMPTION is set to 1 in portmacro.h. |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| vPortPreemptiveTickEntry: |
| #if configUSE_PREEMPTION == 1 |
| portSAVE_CONTEXT ; Save the context of the current task... |
| LDR R0, =vPortPreemptiveTick; before selecting the next task to execute. |
| mov lr, pc |
| BX R0 |
| portRESTORE_CONTEXT ; Restore the context of the selected task. |
| #endif |
| |
| END |