2 ; * FreeRTOS Kernel V10.0.0
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3 ; * Copyright (C) 2017 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. If you wish to use our Amazon
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14 ; * FreeRTOS name, please do so in a fair use way that does not cause confusion.
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16 ; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 ; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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18 ; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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19 ; * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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20 ; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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21 ; * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23 ; * http://www.FreeRTOS.org
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24 ; * http://aws.amazon.com/freertos
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26 ; * 1 tab == 4 spaces!
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29 #include "FreeRTOSConfig.h"
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31 ; Variables used by scheduler
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32 ;------------------------------------------------------------------------------
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34 EXTERN usCriticalNesting
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36 ;------------------------------------------------------------------------------
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37 ; portSAVE_CONTEXT MACRO
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38 ; Saves the context of the general purpose registers, CS and ES (only in far
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39 ; memory mode) registers the usCriticalNesting Value and the Stack Pointer
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40 ; of the active Task onto the task stack
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41 ;------------------------------------------------------------------------------
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42 portSAVE_CONTEXT MACRO
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44 PUSH AX ; Save AX Register to stack.
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46 MOV A, CS ; Save CS register.
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48 MOV A, ES ; Save ES register.
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50 PUSH DE ; Save the remaining general purpose registers.
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52 MOVW AX, usCriticalNesting ; Save the usCriticalNesting value.
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54 MOVW AX, pxCurrentTCB ; Save the Stack pointer.
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59 ;------------------------------------------------------------------------------
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61 ;------------------------------------------------------------------------------
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62 ; portRESTORE_CONTEXT MACRO
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63 ; Restores the task Stack Pointer then use this to restore usCriticalNesting,
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64 ; general purpose registers and the CS and ES (only in far memory mode)
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65 ; of the selected task from the task stack
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66 ;------------------------------------------------------------------------------
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67 portRESTORE_CONTEXT MACRO
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68 MOVW AX, pxCurrentTCB ; Restore the Stack pointer.
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72 POP AX ; Restore usCriticalNesting value.
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73 MOVW usCriticalNesting, AX
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74 POP BC ; Restore the necessary general purpose registers.
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76 POP AX ; Restore the ES register.
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78 XCH A, X ; Restore the CS register.
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80 POP HL ; Restore general purpose register HL.
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81 POP AX ; Restore AX.
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83 ;------------------------------------------------------------------------------
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