2 FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to !<<
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28 >>! distribute a combined work that includes FreeRTOS without being !<<
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29 >>! obliged to provide the source code for proprietary components !<<
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30 >>! outside of the FreeRTOS kernel. !<<
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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66 /* Variables used by scheduler */
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67 .extern _pxCurrentTCB
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68 .extern _usCriticalNesting
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71 * portSAVE_CONTEXT MACRO
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72 * Saves the context of the general purpose registers, CS and ES (only in far
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73 * memory mode) registers the usCriticalNesting Value and the Stack Pointer
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74 * of the active Task onto the task stack
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76 .macro portSAVE_CONTEXT
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80 /* Save AX Register to stack. */
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83 /* Save CS register. */
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86 /* Save ES register. */
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89 /* Save the remaining general purpose registers from bank 0. */
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92 /* Save the other register banks - only necessary in the GCC port. */
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103 /* Registers in bank 3 are for ISR use only so don't need saving. */
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105 /* Save the usCriticalNesting value. */
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106 MOVW AX, !_usCriticalNesting
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108 /* Save the Stack pointer. */
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109 MOVW AX, !_pxCurrentTCB
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113 /* Switch stack pointers. */
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114 movw sp,#_stack /* Set stack pointer */
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120 * portRESTORE_CONTEXT MACRO
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121 * Restores the task Stack Pointer then use this to restore usCriticalNesting,
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122 * general purpose registers and the CS and ES (only in far memory mode)
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123 * of the selected task from the task stack
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125 .macro portRESTORE_CONTEXT MACRO
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127 /* Restore the Stack pointer. */
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128 MOVW AX, !_pxCurrentTCB
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132 /* Restore usCriticalNesting value. */
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134 MOVW !_usCriticalNesting, AX
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135 /* Restore the alternative register banks - only necessary in the GCC
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136 port. Register bank 3 is dedicated for interrupts use so is not saved or
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149 /* Restore the necessary general purpose registers. */
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152 /* Restore the ES register. */
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155 /* Restore the CS register. */
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158 /* Restore general purpose register HL. */
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