/* | |
* FreeRTOS Kernel V10.1.0 | |
* Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved. | |
* | |
* Permission is hereby granted, free of charge, to any person obtaining a copy of | |
* this software and associated documentation files (the "Software"), to deal in | |
* the Software without restriction, including without limitation the rights to | |
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | |
* the Software, and to permit persons to whom the Software is furnished to do so, | |
* subject to the following conditions: | |
* | |
* The above copyright notice and this permission notice shall be included in all | |
* copies or substantial portions of the Software. | |
* | |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | |
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | |
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
* | |
* http://www.FreeRTOS.org | |
* http://aws.amazon.com/freertos | |
* | |
* 1 tab == 4 spaces! | |
*/ | |
/*----------------------------------------------------------- | |
* Implementation of functions defined in portable.h for the RISC-V RV32 port. | |
*----------------------------------------------------------*/ | |
/* Scheduler includes. */ | |
#include "FreeRTOS.h" | |
#include "task.h" | |
#include "portmacro.h" | |
/* | |
* Setup the timer to generate the tick interrupts. The implementation in this | |
* file is weak to allow application writers to change the timer used to | |
* generate the tick interrupt. | |
*/ | |
void vPortSetupTimerInterrupt( void ); | |
/* | |
* Used to catch tasks that attempt to return from their implementing function. | |
*/ | |
static void prvTaskExitError( void ); | |
/*-----------------------------------------------------------*/ | |
void prvTaskExitError( void ) | |
{ | |
volatile uint32_t ulx = 0; | |
/* A function that implements a task must not exit or attempt to return to | |
its caller as there is nothing to return to. If a task wants to exit it | |
should instead call vTaskDelete( NULL ). | |
Artificially force an assert() to be triggered if configASSERT() is | |
defined, then stop here so application writers can catch the error. */ | |
configASSERT( ulx == ~0UL ); | |
portDISABLE_INTERRUPTS(); | |
for( ;; ); | |
} | |
/*-----------------------------------------------------------*/ | |
/* | |
* See header file for description. | |
*/ | |
StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters ) | |
{ | |
/* | |
X1 to X31 integer registers for the 'I' profile, X1 to X15 for the 'E' profile. | |
Register ABI Name Description Saver | |
x0 zero Hard-wired zero - | |
x1 ra Return address Caller | |
x2 sp Stack pointer Callee | |
x3 gp Global pointer - | |
x4 tp Thread pointer - | |
x5-7 t0-2 Temporaries Caller | |
x8 s0/fp Saved register/Frame pointer Callee | |
x9 s1 Saved register Callee | |
x10-11 a0-1 Function Arguments/return values Caller | |
x12-17 a2-7 Function arguments Caller | |
x18-27 s2-11 Saved registers Callee | |
x28-31 t3-6 Temporaries Caller | |
*/ | |
pxTopOfStack--; | |
*pxTopOfStack = ( StackType_t ) pxCode; /* X1 */ | |
pxTopOfStack--; | |
*pxTopOfStack = | |
return pxTopOfStack; | |
} | |
/*-----------------------------------------------------------*/ | |
BaseType_t xPortStartScheduler( void ) | |
{ | |
/*Should not get here*/ | |
return pdFALSE; | |
} | |
/*-----------------------------------------------------------*/ | |