2 FreeRTOS V7.5.1 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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6 ***************************************************************************
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8 * FreeRTOS provides completely free yet professionally developed, *
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9 * robust, strictly quality controlled, supported, and cross *
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10 * platform software that has become a de facto standard. *
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12 * Help yourself get started quickly and support the FreeRTOS *
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13 * project by purchasing a FreeRTOS tutorial book, reference *
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14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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18 ***************************************************************************
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20 This file is part of the FreeRTOS distribution.
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22 FreeRTOS is free software; you can redistribute it and/or modify it under
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23 the terms of the GNU General Public License (version 2) as published by the
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24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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26 >>! NOTE: The modification to the GPL is included to allow you to distribute
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27 >>! a combined work that includes FreeRTOS without being obliged to provide
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28 >>! the source code for proprietary components outside of the FreeRTOS
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31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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34 link: http://www.freertos.org/a00114.html
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38 ***************************************************************************
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40 * Having a problem? Start by reading the FAQ "My application does *
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41 * not run, what could be wrong?" *
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43 * http://www.FreeRTOS.org/FAQHelp.html *
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45 ***************************************************************************
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47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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48 license and Real Time Engineers Ltd. contact details.
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50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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56 licenses offer ticketed support, indemnification and middleware.
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58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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59 engineered and independently SIL3 certified version for use in safety and
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60 mission critical applications that require provable dependability.
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65 /*-----------------------------------------------------------
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66 * Implementation of functions defined in portable.h for the SH2A port.
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67 *----------------------------------------------------------*/
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69 /* Scheduler includes. */
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70 #include "FreeRTOS.h"
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73 /* Library includes. */
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76 /* Hardware specifics. */
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77 #include "iodefine.h"
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79 /*-----------------------------------------------------------*/
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81 /* Tasks should start with interrupts enabled and in Supervisor mode, therefore
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82 PSW is set with U and I set, and PM and IPL clear. */
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83 #define portINITIAL_PSW ( ( portSTACK_TYPE ) 0x00030000 )
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84 #define portINITIAL_FPSW ( ( portSTACK_TYPE ) 0x00000100 )
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86 /* These macros allow a critical section to be added around the call to
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87 xTaskIncrementTick(), which is only ever called from interrupts at the kernel
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88 priority - ie a known priority. Therefore these local macros are a slight
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89 optimisation compared to calling the global SET/CLEAR_INTERRUPT_MASK macros,
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90 which would require the old IPL to be read first and stored in a local variable. */
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91 #define portDISABLE_INTERRUPTS_FROM_KERNEL_ISR() __asm volatile ( "MVTIPL %0" ::"i"(configMAX_SYSCALL_INTERRUPT_PRIORITY) )
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92 #define portENABLE_INTERRUPTS_FROM_KERNEL_ISR() __asm volatile ( "MVTIPL %0" ::"i"(configKERNEL_INTERRUPT_PRIORITY) )
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94 /*-----------------------------------------------------------*/
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97 * Function to start the first task executing - written in asm code as direct
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98 * access to registers is required.
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100 static void prvStartFirstTask( void ) __attribute__((naked));
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103 * Software interrupt handler. Performs the actual context switch (saving and
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104 * restoring of registers). Written in asm code as direct register access is
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107 void vSoftwareInterruptISR( void ) __attribute__((naked));
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110 * The tick interrupt handler.
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112 void vTickISR( void ) __attribute__((interrupt));
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114 /*-----------------------------------------------------------*/
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116 extern void *pxCurrentTCB;
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118 /*-----------------------------------------------------------*/
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121 * See header file for description.
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123 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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125 /* R0 is not included as it is the stack pointer. */
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127 *pxTopOfStack = 0x00;
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129 *pxTopOfStack = portINITIAL_PSW;
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131 *pxTopOfStack = ( portSTACK_TYPE ) pxCode;
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133 /* When debugging it can be useful if every register is set to a known
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134 value. Otherwise code space can be saved by just setting the registers
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135 that need to be set. */
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136 #ifdef USE_FULL_REGISTER_INITIALISATION
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139 *pxTopOfStack = 0xffffffff; /* r15. */
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141 *pxTopOfStack = 0xeeeeeeee;
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143 *pxTopOfStack = 0xdddddddd;
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145 *pxTopOfStack = 0xcccccccc;
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147 *pxTopOfStack = 0xbbbbbbbb;
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149 *pxTopOfStack = 0xaaaaaaaa;
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151 *pxTopOfStack = 0x99999999;
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153 *pxTopOfStack = 0x88888888;
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155 *pxTopOfStack = 0x77777777;
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157 *pxTopOfStack = 0x66666666;
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159 *pxTopOfStack = 0x55555555;
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161 *pxTopOfStack = 0x44444444;
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163 *pxTopOfStack = 0x33333333;
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165 *pxTopOfStack = 0x22222222;
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170 pxTopOfStack -= 15;
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174 *pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R1 */
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176 *pxTopOfStack = portINITIAL_FPSW;
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178 *pxTopOfStack = 0x12345678; /* Accumulator. */
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180 *pxTopOfStack = 0x87654321; /* Accumulator. */
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182 return pxTopOfStack;
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184 /*-----------------------------------------------------------*/
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186 portBASE_TYPE xPortStartScheduler( void )
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188 extern void vApplicationSetupTimerInterrupt( void );
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190 /* Use pxCurrentTCB just so it does not get optimised away. */
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191 if( pxCurrentTCB != NULL )
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193 /* Call an application function to set up the timer that will generate the
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194 tick interrupt. This way the application can decide which peripheral to
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195 use. A demo application is provided to show a suitable example. */
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196 vApplicationSetupTimerInterrupt();
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198 /* Enable the software interrupt. */
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199 _IEN( _ICU_SWINT ) = 1;
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201 /* Ensure the software interrupt is clear. */
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202 _IR( _ICU_SWINT ) = 0;
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204 /* Ensure the software interrupt is set to the kernel priority. */
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205 _IPR( _ICU_SWINT ) = configKERNEL_INTERRUPT_PRIORITY;
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207 /* Start the first task. */
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208 prvStartFirstTask();
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211 /* Should not get here. */
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214 /*-----------------------------------------------------------*/
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216 void vPortEndScheduler( void )
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218 /* Not implemented as there is nothing to return to. */
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220 /*-----------------------------------------------------------*/
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222 static void prvStartFirstTask( void )
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226 /* When starting the scheduler there is nothing that needs moving to the
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227 interrupt stack because the function is not called from an interrupt.
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228 Just ensure the current stack is the user stack. */
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231 /* Obtain the location of the stack associated with which ever task
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232 pxCurrentTCB is currently pointing to. */
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233 "MOV.L #_pxCurrentTCB, R15 \n" \
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234 "MOV.L [R15], R15 \n" \
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235 "MOV.L [R15], R0 \n" \
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237 /* Restore the registers from the stack of the task pointed to by
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241 /* Accumulator low 32 bits. */
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245 /* Accumulator high 32 bits. */
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249 /* Floating point status word. */
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250 "MVTC R15, FPSW \n" \
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252 /* R1 to R15 - R0 is not included as it is the SP. */
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255 /* This pops the remaining registers. */
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261 /*-----------------------------------------------------------*/
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263 void vSoftwareInterruptISR( void )
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267 /* Re-enable interrupts. */
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270 /* Move the data that was automatically pushed onto the interrupt stack when
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271 the interrupt occurred from the interrupt stack to the user stack.
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273 R15 is saved before it is clobbered. */
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276 /* Read the user stack pointer. */
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277 "MVFC USP, R15 \n" \
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279 /* Move the address down to the data being moved. */
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280 "SUB #12, R15 \n" \
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281 "MVTC R15, USP \n" \
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283 /* Copy the data across, R15, then PC, then PSW. */
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284 "MOV.L [ R0 ], [ R15 ] \n" \
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285 "MOV.L 4[ R0 ], 4[ R15 ] \n" \
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286 "MOV.L 8[ R0 ], 8[ R15 ] \n" \
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288 /* Move the interrupt stack pointer to its new correct position. */
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291 /* All the rest of the registers are saved directly to the user stack. */
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294 /* Save the rest of the general registers (R15 has been saved already). */
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295 "PUSHM R1-R14 \n" \
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297 /* Save the FPSW and accumulator. */
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298 "MVFC FPSW, R15 \n" \
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306 /* Shifted left as it is restored to the low order word. */
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307 "SHLL #16, R15 \n" \
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310 /* Save the stack pointer to the TCB. */
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311 "MOV.L #_pxCurrentTCB, R15 \n" \
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312 "MOV.L [ R15 ], R15 \n" \
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313 "MOV.L R0, [ R15 ] \n" \
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315 /* Ensure the interrupt mask is set to the syscall priority while the kernel
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316 structures are being accessed. */
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319 /* Select the next task to run. */
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320 "BSR.A _vTaskSwitchContext \n" \
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322 /* Reset the interrupt mask as no more data structure access is required. */
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325 /* Load the stack pointer of the task that is now selected as the Running
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326 state task from its TCB. */
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327 "MOV.L #_pxCurrentTCB,R15 \n" \
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328 "MOV.L [ R15 ], R15 \n" \
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329 "MOV.L [ R15 ], R0 \n" \
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331 /* Restore the context of the new task. The PSW (Program Status Word) and
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332 PC will be popped by the RTE instruction. */
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338 "MVTC R15, FPSW \n" \
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343 :: "i"(configMAX_SYSCALL_INTERRUPT_PRIORITY), "i"(configKERNEL_INTERRUPT_PRIORITY)
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346 /*-----------------------------------------------------------*/
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348 void vTickISR( void )
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350 /* Re-enabled interrupts. */
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351 __asm volatile( "SETPSW I" );
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353 /* Increment the tick, and perform any processing the new tick value
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354 necessitates. Ensure IPL is at the max syscall value first. */
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355 portDISABLE_INTERRUPTS_FROM_KERNEL_ISR();
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357 if( xTaskIncrementTick() != pdFALSE )
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362 portENABLE_INTERRUPTS_FROM_KERNEL_ISR();
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364 /*-----------------------------------------------------------*/
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366 unsigned long ulPortGetIPL( void )
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370 "MVFC PSW, R1 \n" \
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371 "SHLR #24, R1 \n" \
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375 /* This will never get executed, but keeps the compiler from complaining. */
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378 /*-----------------------------------------------------------*/
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380 void vPortSetIPL( unsigned long ulNewIPL )
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385 "MVFC PSW, R5 \n" \
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386 "SHLL #24, R1 \n" \
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387 "AND #-0F000001H, R5 \n" \
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389 "MVTC R5, PSW \n" \
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