2 * FreeRTOS Kernel V10.3.0
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3 * Copyright (C) 2020 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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32 extern volatile TCB_t * volatile pxCurrentTCB;
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33 extern void vTaskSwitchContext( void );
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36 * Saves the stack pointer for one task into its TCB, calls
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37 * vTaskSwitchContext() to update the TCB being used, then restores the stack
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38 * from the new TCB read to run the task.
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40 void portEND_SWITCHING_ISR( void );
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43 * Load the stack pointer from the TCB of the task which is going to be first
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44 * to execute. Then force an IRET so the registers and IP are popped off the
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47 void portFIRST_CONTEXT( void );
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49 #define portEND_SWITCHING_ISR() \
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50 asm { mov bx, [pxCurrentTCB] } \
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51 asm { mov word ptr [bx], sp } \
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52 asm { call far ptr vTaskSwitchContext } \
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53 asm { mov bx, [pxCurrentTCB] } \
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54 asm { mov sp, [bx] }
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56 #define portFIRST_CONTEXT() \
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57 asm { mov bx, [pxCurrentTCB] } \
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58 asm { mov sp, [bx] } \
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