2 FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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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 modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or 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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44 ***************************************************************************
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46 * Having a problem? Start by reading the FAQ "My application does *
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47 * not run, what could be wrong? *
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49 * http://www.FreeRTOS.org/FAQHelp.html *
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51 ***************************************************************************
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54 http://www.FreeRTOS.org - Documentation, training, latest information,
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55 license and contact details.
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57 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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58 including FreeRTOS+Trace - an indispensable productivity tool.
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60 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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61 the code with commercial support, indemnification, and middleware, under
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62 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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63 provide a safety engineered and independently SIL3 certified version under
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64 the SafeRTOS brand: http://www.SafeRTOS.com.
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67 typedef void tskTCB;
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68 extern volatile tskTCB * volatile pxCurrentTCB;
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69 extern void vTaskSwitchContext( void );
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72 * Saves the stack pointer for one task into its TCB, calls
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73 * vTaskSwitchContext() to update the TCB being used, then restores the stack
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74 * from the new TCB read to run the task.
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76 void portSWITCH_CONTEXT( void );
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79 * Load the stack pointer from the TCB of the task which is going to be first
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80 * to execute. Then force an IRET so the registers and IP are popped off the
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83 void portFIRST_CONTEXT( void );
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85 #define portSWITCH_CONTEXT() \
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86 asm { mov ax, seg pxCurrentTCB } \
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87 asm { mov ds, ax } \
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88 asm { les bx, pxCurrentTCB } /* Save the stack pointer into the TCB. */ \
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89 asm { mov es:0x2[ bx ], ss } \
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90 asm { mov es:[ bx ], sp } \
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91 asm { call far ptr vTaskSwitchContext } /* Perform the switch. */ \
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92 asm { mov ax, seg pxCurrentTCB } /* Restore the stack pointer from the TCB. */ \
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93 asm { mov ds, ax } \
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94 asm { les bx, dword ptr pxCurrentTCB } \
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95 asm { mov ss, es:[ bx + 2 ] } \
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96 asm { mov sp, es:[ bx ] }
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98 #define portFIRST_CONTEXT() \
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99 asm { mov ax, seg pxCurrentTCB } \
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100 asm { mov ds, ax } \
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101 asm { les bx, dword ptr pxCurrentTCB } \
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102 asm { mov ss, es:[ bx + 2 ] } \
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103 asm { mov sp, es:[ bx ] } \
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projects / freertos / blob