2 ; FreeRTOS V7.5.2 - Copyright (C) 2013 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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40 ; FreeRTOS WEB site.
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42 ; 1 tab == 4 spaces!
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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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53 ; Note: Select the correct include files for the device used by the application.
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54 #include "FreeRTOSConfig.h"
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55 ;------------------------------------------------------------------------------
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57 ; Functions used by scheduler
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58 ;------------------------------------------------------------------------------
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59 EXTERN vTaskSwitchContext
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60 EXTERN xTaskIncrementTick
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62 ; Variables used by scheduler
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63 ;------------------------------------------------------------------------------
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65 EXTERN usCriticalNesting
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67 ; Functions implemented in this file
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68 ;------------------------------------------------------------------------------
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72 ; Security ID definition
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73 ;------------------------------------------------------------------------------
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74 #define CG_SECURITY0 0FFH
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75 #define CG_SECURITY1 0FFH
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76 #define CG_SECURITY2 0FFH
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77 #define CG_SECURITY3 0FFH
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78 #define CG_SECURITY4 0FFH
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79 #define CG_SECURITY5 0FFH
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80 #define CG_SECURITY6 0FFH
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81 #define CG_SECURITY7 0FFH
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82 #define CG_SECURITY8 0FFH
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83 #define CG_SECURITY9 0FFH
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85 ; Tick ISR Prototype
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86 ;------------------------------------------------------------------------------
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87 PUBWEAK `??MD_INTTM0EQ0??INTVEC 640`
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90 MD_INTTM0EQ0 SYMBOL "MD_INTTM0EQ0"
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91 `??MD_INTTM0EQ0??INTVEC 640` SYMBOL "??INTVEC 640", MD_INTTM0EQ0
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93 ;------------------------------------------------------------------------------
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94 ; portSAVE_CONTEXT MACRO
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95 ; Saves the context of the remaining general purpose registers
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96 ; and the usCriticalNesting Value of the active Task onto the task stack
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97 ; saves stack pointer to the TCB
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98 ;------------------------------------------------------------------------------
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99 portSAVE_CONTEXT MACRO
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100 #if configDATA_MODE == 1 ; Using the Tiny data model
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101 prepare {r20,r21,r22,r23,r24,r25,r26,r27,r28,r29,r30},76,sp ; save general purpose registers
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118 #else ; Using the Small/Large data model
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119 prepare {r20,r21,r22,r23,r24,r26,r27,r28,r29,r30},72,sp ; save general purpose registers
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135 #endif /* configDATA_MODE */
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138 MOVHI hi1(usCriticalNesting),r0,r1 ; save usCriticalNesting value to stack
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139 ld.w lw1(usCriticalNesting)[r1],r2
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141 MOVHI hi1(pxCurrentTCB),r0,r1 ; save SP to top of current TCB
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142 ld.w lw1(pxCurrentTCB)[r1],r2
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145 ;------------------------------------------------------------------------------
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147 ;------------------------------------------------------------------------------
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148 ; portRESTORE_CONTEXT MACRO
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149 ; Gets stack pointer from the current TCB
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150 ; Restores the context of the usCriticalNesting value and general purpose
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151 ; registers of the selected task from the task stack
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152 ;------------------------------------------------------------------------------
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153 portRESTORE_CONTEXT MACRO
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154 MOVHI hi1(pxCurrentTCB),r0,r1 ; get Stackpointer address
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155 ld.w lw1(pxCurrentTCB)[r1],sp
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157 ld.w 0[r1],sp ; load stackpointer
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158 MOV sp,ep ; set stack pointer to element pointer
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159 sld.w 0[ep],r1 ; load usCriticalNesting value from stack
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160 MOVHI hi1(usCriticalNesting),r0,r2
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161 st.w r1,lw1(usCriticalNesting)[r2]
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162 sld.w 4[ep],r1 ; restore general purpose registers
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164 #if configDATA_MODE == 1 ; Using Tiny data model
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181 dispose 76,{r20,r21,r22,r23,r24,r25,r26,r27,r28,r29,r30}
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182 #else ; Using Small/Large data model
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198 dispose 72,{r20,r21,r22,r23,r24,r26,r27,r28,r29,r30}
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199 #endif /* configDATA_MODE */
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201 ;------------------------------------------------------------------------------
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203 ;------------------------------------------------------------------------------
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204 ; Restore the context of the first task that is going to run.
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208 ; Call: CALL vPortStart
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211 ;------------------------------------------------------------------------------
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214 portRESTORE_CONTEXT ; Restore the context of whichever task the ...
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216 ldsr lp,5 ; restore PSW
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218 ld.w 4[sp],lp ; restore LP
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219 ld.w 8[sp],lp ; restore LP
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220 ADD 0x0C,sp ; set SP to right position
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223 ;------------------------------------------------------------------------------
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225 ;------------------------------------------------------------------------------
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226 ; Port Yield function to check for a Task switch in the cooperative and
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231 ; Call: CALL vPortYield
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234 ;------------------------------------------------------------------------------
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239 add -0x0C,sp ; prepare stack to save necessary values
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240 st.w lp,8[sp] ; store LP to stack
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242 st.w lp,4[sp] ; store EIPC to stack
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244 st.w lp,0[sp] ; store EIPSW to stack
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245 portSAVE_CONTEXT ; Save the context of the current task.
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246 jarl vTaskSwitchContext,lp ; Call the scheduler.
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247 portRESTORE_CONTEXT ; Restore the context of whichever task the ...
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248 ; ... scheduler decided should run.
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249 ld.w 0[sp],lp ; restore EIPSW from stack
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251 ld.w 4[sp],lp ; restore EIPC from stack
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253 ld.w 8[sp],lp ; restore LP from stack
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254 add 0x0C,sp ; set SP to right position
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258 ;------------------------------------------------------------------------------
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260 ;------------------------------------------------------------------------------
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261 ; Perform the necessary steps of the Tick Count Increment and Task Switch
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262 ; depending on the chosen kernel configuration
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269 ;------------------------------------------------------------------------------
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270 #if configUSE_PREEMPTION == 1 ; use preemptive kernel mode
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274 add -0x0C,sp ; prepare stack to save necessary values
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275 st.w lp,8[sp] ; store LP to stack
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277 st.w lp,4[sp] ; store EIPC to stack
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279 st.w lp,0[sp] ; store EIPSW to stack
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280 portSAVE_CONTEXT ; Save the context of the current task.
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281 jarl xTaskIncrementTick,lp ; Call the timer tick function.
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282 jarl vTaskSwitchContext,lp ; Call the scheduler.
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283 portRESTORE_CONTEXT ; Restore the context of whichever task the ...
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284 ; ... scheduler decided should run.
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285 ld.w 0[sp],lp ; restore EIPSW from stack
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287 ld.w 4[sp],lp ; restore EIPC from stack
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289 ld.w 8[sp],lp ; restore LP from stack
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290 add 0x0C,sp ; set SP to right position
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293 ;------------------------------------------------------------------------------
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294 #else ; use cooperative kernel mode
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297 prepare {lp,ep},8,sp
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300 jarl xTaskIncrementTick,lp ; Call the timer tick function.
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305 #endif /* configUSE_PREEMPTION */
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307 ;------------------------------------------------------------------------------
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308 COMMON INTVEC:CODE:ROOT(2)
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310 `??MD_INTTM0EQ0??INTVEC 640`:
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313 RSEG NEAR_ID:CONST:SORT:NOROOT(2)
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314 `?<Initializer for usCriticalNesting>`:
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317 COMMON INTVEC:CODE:ROOT(2)
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319 `??vPortYield??INTVEC 40`:
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322 ;------------------------------------------------------------------------------
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323 ; set microcontroller security ID
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325 COMMON INTVEC:CODE:ROOT(2)
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