2 ; FreeRTOS V6.0.4 - Copyright (C) 2010 Real Time Engineers Ltd.
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4 ; ***************************************************************************
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8 ; * + New to FreeRTOS, *
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9 ; * + Wanting to learn FreeRTOS or multitasking in general quickly *
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10 ; * + Looking for basic training, *
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11 ; * + Wanting to improve your FreeRTOS skills and productivity *
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13 ; * then take a look at the FreeRTOS eBook *
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15 ; * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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16 ; * http://www.FreeRTOS.org/Documentation *
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18 ; * A pdf reference manual is also available. Both are usually delivered *
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19 ; * to your inbox within 20 minutes to two hours when purchased between 8am *
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20 ; * and 8pm GMT (although please allow up to 24 hours in case of *
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21 ; * exceptional circumstances). Thank you for your support! *
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23 ; ***************************************************************************
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25 ; This file is part of the FreeRTOS distribution.
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27 ; FreeRTOS is free software; you can redistribute it and/or modify it under
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28 ; the terms of the GNU General Public License (version 2) as published by the
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29 ; Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 ; ***NOTE*** The exception to the GPL is included to allow you to distribute
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31 ; a combined work that includes FreeRTOS without being obliged to provide the
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32 ; source code for proprietary components outside of the FreeRTOS kernel.
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33 ; FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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34 ; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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35 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 ; more details. You should have received a copy of the GNU General Public
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37 ; License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 ; can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 ; by writing to Richard Barry, contact details for whom are available on the
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40 ; FreeRTOS WEB site.
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42 ; 1 tab == 4 spaces!
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44 ; http://www.FreeRTOS.org - Documentation, latest information, license and
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47 ; http://www.SafeRTOS.com - A version that is certified for use in safety
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50 ; http://www.OpenRTOS.com - Commercial support, development, porting,
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51 ; licensing and training services.
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54 #include "FreeRTOSConfig.h"
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56 ; Variables used by scheduler
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57 ;------------------------------------------------------------------------------
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59 EXTERN usCriticalNesting
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61 ;------------------------------------------------------------------------------
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62 ; portSAVE_CONTEXT MACRO
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63 ; Saves the context of the general purpose registers, CS and ES (only in far
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64 ; memory mode) registers the usCriticalNesting Value and the Stack Pointer
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65 ; of the active Task onto the task stack
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66 ;------------------------------------------------------------------------------
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67 portSAVE_CONTEXT MACRO
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69 PUSH AX ; Save AX Register to stack.
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71 #if configMEMORY_MODE == 1
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72 MOV A, CS ; Save CS register.
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74 MOV A, ES ; Save ES register.
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77 MOV A, CS ; Save CS register.
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80 PUSH DE ; Save the remaining general purpose registers.
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82 MOVW AX, usCriticalNesting ; Save the usCriticalNesting value.
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84 MOVW AX, pxCurrentTCB ; Save the Stack pointer.
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89 ;------------------------------------------------------------------------------
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91 ;------------------------------------------------------------------------------
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92 ; portRESTORE_CONTEXT MACRO
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93 ; Restores the task Stack Pointer then use this to restore usCriticalNesting,
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94 ; general purpose registers and the CS and ES (only in far memory mode)
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95 ; of the selected task from the task stack
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96 ;------------------------------------------------------------------------------
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97 portRESTORE_CONTEXT MACRO
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98 MOVW AX, pxCurrentTCB ; Restore the Stack pointer.
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102 POP AX ; Restore usCriticalNesting value.
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103 MOVW usCriticalNesting, AX
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104 POP BC ; Restore the necessary general purpose registers.
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106 #if configMEMORY_MODE == 1
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107 POP AX ; Restore the ES register.
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109 XCH A, X ; Restore the CS register.
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113 MOV CS, A ; Restore CS register.
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115 POP HL ; Restore general purpose register HL.
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116 POP AX ; Restore AX.
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118 ;------------------------------------------------------------------------------
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