mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-04-24 15:31:56 -04:00
32f35e9130
Added code to setup the timer interrupt - not tested yet. Added the taskYIELD() implementation - so far just checked it generates an interrupt.
233 lines
7.9 KiB
C
233 lines
7.9 KiB
C
/*
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* FreeRTOS Kernel V10.1.1
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* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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* 1 tab == 4 spaces!
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*/
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/*-----------------------------------------------------------
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* Implementation of functions defined in portable.h for the RISC-V RV32 port.
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*----------------------------------------------------------*/
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "portmacro.h"
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/*
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* Setup the timer to generate the tick interrupts. The implementation in this
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* file is weak to allow application writers to change the timer used to
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* generate the tick interrupt.
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*/
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void vPortSetupTimerInterrupt( void ) __attribute__(( weak ));
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/*
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* Used to catch tasks that attempt to return from their implementing function.
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*/
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static void prvTaskExitError( void );
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/*-----------------------------------------------------------*/
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/* Used to program the machine timer compare register. */
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static uint64_t ullNextTime = 0ULL;
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static volatile uint64_t * const pullMachineTimerCompareRegister = ( volatile uint64_t * const ) 0x2004000;
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/*-----------------------------------------------------------*/
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void prvTaskExitError( void )
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{
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volatile uint32_t ulx = 0;
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#warning prvTaskExitError not used yet.
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/* A function that implements a task must not exit or attempt to return to
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its caller as there is nothing to return to. If a task wants to exit it
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should instead call vTaskDelete( NULL ).
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Artificially force an assert() to be triggered if configASSERT() is
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defined, then stop here so application writers can catch the error. */
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configASSERT( ulx == ~0UL );
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portDISABLE_INTERRUPTS();
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for( ;; );
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}
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/*-----------------------------------------------------------*/
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/*
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* See header file for description.
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*/
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StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
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{
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/*
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X1 to X31 integer registers for the 'I' profile, X1 to X15 for the 'E' profile.
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Register ABI Name Description Saver
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x0 zero Hard-wired zero -
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x1 ra Return address Caller
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x2 sp Stack pointer Callee
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x3 gp Global pointer -
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x4 tp Thread pointer -
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x5-7 t0-2 Temporaries Caller
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x8 s0/fp Saved register/Frame pointer Callee
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x9 s1 Saved register Callee
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x10-11 a0-1 Function Arguments/return values Caller
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x12-17 a2-7 Function arguments Caller
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x18-27 s2-11 Saved registers Callee
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x28-31 t3-6 Temporaries Caller
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*/
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) pxCode; /* X1 */
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pxTopOfStack--;
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// *pxTopOfStack = ( StackType_t ) 2; /* Stack pointer is handled separately. */
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// pxTopOfStack--;
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// *pxTopOfStack = ( StackType_t ) 3; /* Global pointer is not manipulated. */
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// pxTopOfStack--;
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// *pxTopOfStack = ( StackType_t ) 4; /* Thread pointer is not manipulated. */
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// pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 5;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 6;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 7;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 8;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 9;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) pvParameters;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 11;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 12;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 13;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 14;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 15;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 16;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 17;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 18;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 19;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 20;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 21;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 22;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 23;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 24;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 25;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 26;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 27;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 28;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 29;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 30;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 31;
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return pxTopOfStack;
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}
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/*-----------------------------------------------------------*/
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void vPortSetupTimerInterrupt( void )
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{
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uint32_t ulCurrentTimeHigh, ulCurrentTimeLow;
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volatile uint32_t * const pulTimeHigh = ( volatile uint32_t * const ) 0x200BFF8;
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volatile uint32_t * const pulTimeLow = ( volatile uint32_t * const ) 0x200BFFc;
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do
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{
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ulCurrentTimeHigh = *pulTimeHigh;
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ulCurrentTimeLow = *pulTimeLow;
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} while( ulCurrentTimeHigh != *pulTimeHigh );
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ullNextTime = ( uint64_t ) ulCurrentTimeHigh;
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ullNextTime <<= 32ULL;
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ullNextTime |= ( uint64_t ) ulCurrentTimeLow;
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ullNextTime += ( configCPU_CLOCK_HZ / configTICK_RATE_HZ );
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*pullMachineTimerCompareRegister = ullNextTime;
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/* Enable timer interrupt */
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__asm volatile( "csrs mie, %0" :: "r"(0x80) );
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}
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/*-----------------------------------------------------------*/
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BaseType_t xPortStartScheduler( void )
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{
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__asm volatile
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(
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".extern pxCurrentTCB \r\n"
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"lw sp, pxCurrentTCB \r\n" /* Load pxCurrentTCB. */
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"lw sp, 0x00( sp ) \r\n" /* Read sp from first TCB member. */
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"lw x31, 0( sp ) \r\n" /* X31 */
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"lw x30, 4( sp ) \r\n" /* X30 */
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"lw x29, 8( sp ) \r\n" /* X29 */
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"lw x28, 12( sp ) \r\n" /* X28 */
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"lw x27, 16( sp ) \r\n" /* X27 */
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"lw x26, 20( sp ) \r\n" /* X26 */
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"lw x25, 24( sp ) \r\n" /* X25 */
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"lw x24, 28( sp ) \r\n" /* X24 */
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"lw x23, 32( sp ) \r\n" /* X23 */
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"lw x22, 36( sp ) \r\n" /* X22 */
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"lw x21, 40( sp ) \r\n" /* X21 */
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"lw x20, 44( sp ) \r\n" /* X20 */
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"lw x19, 48( sp ) \r\n" /* X19 */
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"lw x18, 52( sp ) \r\n" /* X18 */
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"lw x17, 56( sp ) \r\n" /* X17 */
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"lw x16, 60( sp ) \r\n" /* X16 */
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"lw x15, 64( sp ) \r\n" /* X15 */
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"lw x14, 68( sp ) \r\n" /* X14 */
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"lw x13, 72( sp ) \r\n" /* X13 */
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"lw x12, 76( sp ) \r\n" /* X12 */
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"lw x11, 80( sp ) \r\n" /* X11 */
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"lw x10, 84( sp ) \r\n" /* X10 */
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"lw x9, 88( sp ) \r\n" /* X9 */
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"lw x8, 92( sp ) \r\n" /* X8 */
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"lw x7, 96( sp ) \r\n" /* X7 */
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"lw x6, 100( sp ) \r\n" /* X6 */
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"lw x5, 104( sp ) \r\n" /* X5 */
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"lw x1, 108( sp ) \r\n" /* X1 */
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"csrs mie, 8 \r\n" /* Enable soft interrupt. */
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"csrs mstatus, 8 \r\n" /* Enable interrupts. */
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"ret "
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);
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/*Should not get here*/
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return pdFALSE;
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}
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/*-----------------------------------------------------------*/
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