2 FreeRTOS.org V5.0.4 - Copyright (C) 2003-2008 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 ***************************************************************************
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29 * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
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30 * and even write all or part of your application on your behalf. *
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31 * See http://www.OpenRTOS.com for details of the services we provide to *
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32 * expedite your project. *
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34 ***************************************************************************
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35 ***************************************************************************
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37 Please ensure to read the configuration and relevant port sections of the
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38 online documentation.
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40 http://www.FreeRTOS.org - Documentation, latest information, license and
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43 http://www.SafeRTOS.com - A version that is certified for use in safety
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46 http://www.OpenRTOS.com - Commercial support, development, porting,
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47 licensing and training services.
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53 typedef void tskTCB;
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54 extern volatile tskTCB * volatile pxCurrentTCB;
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55 extern void vTaskSwitchContext( void );
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58 * Saves the stack pointer for one task into its TCB, calls
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59 * vTaskSwitchContext() to update the TCB being used, then restores the stack
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60 * from the new TCB read to run the task.
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62 void portSWITCH_CONTEXT( void );
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65 * Load the stack pointer from the TCB of the task which is going to be first
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66 * to execute. Then force an IRET so the registers and IP are popped off the
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69 void portFIRST_CONTEXT( void );
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71 /* There are slightly different versions depending on whether you are building
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72 to include debugger information. If debugger information is used then there
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73 are a couple of extra bytes left of the ISR stack (presumably for use by the
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74 debugger). The true stack pointer is then stored in the bp register. We add
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75 2 to the stack pointer to remove the extra bytes before we restore our context. */
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77 #define portSWITCH_CONTEXT() \
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78 asm { mov ax, seg pxCurrentTCB } \
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79 asm { mov ds, ax } \
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80 asm { les bx, pxCurrentTCB } /* Save the stack pointer into the TCB. */ \
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81 asm { mov es:0x2[ bx ], ss } \
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82 asm { mov es:[ bx ], sp } \
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83 asm { call far ptr vTaskSwitchContext } /* Perform the switch. */ \
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84 asm { mov ax, seg pxCurrentTCB } /* Restore the stack pointer from the TCB. */ \
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85 asm { mov ds, ax } \
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86 asm { les bx, dword ptr pxCurrentTCB } \
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87 asm { mov ss, es:[ bx + 2 ] } \
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88 asm { mov sp, es:[ bx ] }
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90 #define portFIRST_CONTEXT() \
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91 __asm { mov ax, seg pxCurrentTCB } \
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92 __asm { mov ds, ax } \
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93 __asm { les bx, dword ptr pxCurrentTCB } \
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94 __asm { mov ss, es:[ bx + 2 ] } \
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95 __asm { mov sp, es:[ bx ] } \
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projects / freertos / blob