2 FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
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34 distribute a combined work that includes FreeRTOS without being obliged to
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35 provide the source code for proprietary components outside of the FreeRTOS
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38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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41 details. You should have received a copy of the GNU General Public License
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42 and the FreeRTOS license exception along with FreeRTOS; if not it can be
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43 viewed here: http://www.freertos.org/a00114.html and also obtained by
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44 writing to Real Time Engineers Ltd., contact details for whom are available
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45 on the FreeRTOS WEB site.
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49 ***************************************************************************
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51 * Having a problem? Start by reading the FAQ "My application does *
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52 * not run, what could be wrong?" *
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54 * http://www.FreeRTOS.org/FAQHelp.html *
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56 ***************************************************************************
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59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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60 license and Real Time Engineers Ltd. contact details.
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62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
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64 fully thread aware and reentrant UDP/IP stack.
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66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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67 Integrity Systems, who sell the code with commercial support,
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68 indemnification and middleware, under the OpenRTOS brand.
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70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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71 engineered and independently SIL3 certified version for use in safety and
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72 mission critical applications that require provable dependability.
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75 typedef void tskTCB;
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76 extern volatile tskTCB * volatile pxCurrentTCB;
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77 extern void vTaskSwitchContext( void );
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80 * Saves the stack pointer for one task into its TCB, calls
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81 * vTaskSwitchContext() to update the TCB being used, then restores the stack
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82 * from the new TCB read to run the task.
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84 void portSWITCH_CONTEXT( void );
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87 * Load the stack pointer from the TCB of the task which is going to be first
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88 * to execute. Then force an IRET so the registers and IP are popped off the
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91 void portFIRST_CONTEXT( void );
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93 #define portSWITCH_CONTEXT() \
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94 asm { mov ax, seg pxCurrentTCB } \
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95 asm { mov ds, ax } \
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96 asm { les bx, pxCurrentTCB } /* Save the stack pointer into the TCB. */ \
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97 asm { mov es:0x2[ bx ], ss } \
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98 asm { mov es:[ bx ], sp } \
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99 asm { call far ptr vTaskSwitchContext } /* Perform the switch. */ \
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100 asm { mov ax, seg pxCurrentTCB } /* Restore the stack pointer from the TCB. */ \
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101 asm { mov ds, ax } \
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102 asm { les bx, dword ptr pxCurrentTCB } \
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103 asm { mov ss, es:[ bx + 2 ] } \
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104 asm { mov sp, es:[ bx ] }
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106 #define portFIRST_CONTEXT() \
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107 asm { mov ax, seg pxCurrentTCB } \
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108 asm { mov ds, ax } \
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109 asm { les bx, dword ptr pxCurrentTCB } \
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110 asm { mov ss, es:[ bx + 2 ] } \
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111 asm { mov sp, es:[ bx ] } \
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projects / freertos / blob