2 FreeRTOS V6.1.1 - Copyright (C) 2011 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 books - available as PDF or paperback *
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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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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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55 EXTERN usCriticalNesting
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57 #include "FreeRTOSConfig.h"
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59 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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60 ; Context save and restore macro definitions
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61 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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63 portSAVE_CONTEXT MACRO
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65 add -0x0C,sp ; prepare stack to save necessary values
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66 st.w lp,8[sp] ; store LP to stack
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68 st.w lp,4[sp] ; store EIPC to stack
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70 st.w lp,0[sp] ; store EIPSW to stack
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71 #if configDATA_MODE == 1 ; Using the Tiny data model
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72 prepare {r20,r21,r22,r23,r24,r25,r26,r27,r28,r29,r30},76,sp ; save general purpose registers
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89 #else ; Using the Small/Large data model
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90 prepare {r20,r21,r22,r23,r24,r26,r27,r28,r29,r30},72,sp ; save general purpose registers
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106 #endif /* configDATA_MODE */
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109 MOVHI hi1(usCriticalNesting),r0,r1 ; save usCriticalNesting value to stack
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110 ld.w lw1(usCriticalNesting)[r1],r2
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112 MOVHI hi1(pxCurrentTCB),r0,r1 ; save SP to top of current TCB
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113 ld.w lw1(pxCurrentTCB)[r1],r2
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118 portRESTORE_CONTEXT MACRO
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120 MOVHI hi1(pxCurrentTCB),r0,r1 ; get Stackpointer address
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121 ld.w lw1(pxCurrentTCB)[r1],sp
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123 ld.w 0[r1],sp ; load stackpointer
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124 MOV sp,ep ; set stack pointer to element pointer
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125 sld.w 0[ep],r1 ; load usCriticalNesting value from stack
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126 MOVHI hi1(usCriticalNesting),r0,r2
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127 st.w r1,lw1(usCriticalNesting)[r2]
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128 sld.w 4[ep],r1 ; restore general purpose registers
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130 #if configDATA_MODE == 1 ; Using Tiny data model
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147 dispose 76,{r20,r21,r22,r23,r24,r25,r26,r27,r28,r29,r30}
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148 #else ; Using Small/Large data model
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164 dispose 72,{r20,r21,r22,r23,r24,r26,r27,r28,r29,r30}
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165 #endif /* configDATA_MODE */
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166 ld.w 0[sp],lp ; restore EIPSW from stack
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168 ld.w 4[sp],lp ; restore EIPC from stack
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170 ld.w 8[sp],lp ; restore LP from stack
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171 add 0x0C,sp ; set SP to right position
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