mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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989bc332b2
* Add XMOS XCore ports Some minor modifications are also made to the kernel to support the XCore compiler's automatic stack size calculation. * Update kernel to support SMP The XMOS XCore ports are also updated to support SMP. * Fix compiler warnings in xcore ports The port set and clear interrupt mask from ISR macros were removed from the ports so that the default macros found in FreeRTOS.h are used instead. The default macros do not result in warnings when they are used. * Remove inline function from timers.h Inline function converted to macro. This should now build when optimizations are off and inlining is disabled. * Fix compiler warnings in xcore ports and tasks.c * fixed documentation for ulTaskNotifyTake() and ulTaskNotifyTakeIndexed() * spelling fixes for tasks.c Co-authored-by: Michael Bruno <mikeb@xmos.com>
240 lines
7.6 KiB
C
240 lines
7.6 KiB
C
/*
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* FreeRTOS Kernel V10.4.3
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* Copyright (C) 2020 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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* https://www.FreeRTOS.org
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* https://github.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 Tern EE 186
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* port.
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*----------------------------------------------------------*/
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/* Library includes. */
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#include <embedded.h>
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#include <ae.h>
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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 "portasm.h"
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/* The timer increments every four clocks, hence the divide by 4. */
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#define portTIMER_COMPARE ( uint16_t ) ( ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) / ( uint32_t ) 4 )
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/* From the RDC data sheet. */
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#define portENABLE_TIMER_AND_INTERRUPT ( uint16_t ) 0xe001
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/* Interrupt control. */
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#define portEIO_REGISTER 0xff22
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#define portCLEAR_INTERRUPT 0x0008
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/* Setup the hardware to generate the required tick frequency. */
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static void prvSetupTimerInterrupt( void );
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/* The ISR used depends on whether the preemptive or cooperative scheduler
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is being used. */
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#if( configUSE_PREEMPTION == 1 )
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/* Tick service routine used by the scheduler when preemptive scheduling is
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being used. */
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static void __interrupt __far prvPreemptiveTick( void );
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#else
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/* Tick service routine used by the scheduler when cooperative scheduling is
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being used. */
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static void __interrupt __far prvNonPreemptiveTick( void );
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#endif
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/* Trap routine used by taskYIELD() to manually cause a context switch. */
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static void __interrupt __far prvYieldProcessor( void );
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/* The timer initialisation functions leave interrupts enabled,
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which is not what we want. This ISR is installed temporarily in case
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the timer fires before we get a change to disable interrupts again. */
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static void __interrupt __far prvDummyISR( void );
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/*-----------------------------------------------------------*/
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/* See header file for description. */
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StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
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{
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StackType_t DS_Reg = 0;
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/* Place a few bytes of known values on the bottom of the stack.
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This is just useful for debugging. */
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*pxTopOfStack = 0x1111;
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pxTopOfStack--;
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*pxTopOfStack = 0x2222;
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pxTopOfStack--;
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*pxTopOfStack = 0x3333;
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pxTopOfStack--;
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/* We are going to start the scheduler using a return from interrupt
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instruction to load the program counter, so first there would be the
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function call with parameters preamble. */
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*pxTopOfStack = FP_SEG( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* Next the status register and interrupt return address. */
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*pxTopOfStack = portINITIAL_SW;
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* The remaining registers would be pushed on the stack by our context
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switch function. These are loaded with values simply to make debugging
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easier. */
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*pxTopOfStack = ( StackType_t ) 0xAAAA; /* AX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xCCCC; /* CX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xEEEE; /* ES */
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pxTopOfStack--;
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/* We need the true data segment. */
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__asm{ MOV DS_Reg, DS };
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*pxTopOfStack = DS_Reg; /* DS */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x0123; /* SI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BP */
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return pxTopOfStack;
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}
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/*-----------------------------------------------------------*/
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BaseType_t xPortStartScheduler( void )
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{
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/* This is called with interrupts already disabled. */
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/* Put our manual switch (yield) function on a known
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vector. */
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setvect( portSWITCH_INT_NUMBER, prvYieldProcessor );
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/* Setup the tick interrupt. */
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prvSetupTimerInterrupt();
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/* Kick off the scheduler by setting up the context of the first task. */
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portFIRST_CONTEXT();
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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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static void __interrupt __far prvDummyISR( void )
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{
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/* The timer initialisation functions leave interrupts enabled,
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which is not what we want. This ISR is installed temporarily in case
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the timer fires before we get a change to disable interrupts again. */
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outport( portEIO_REGISTER, portCLEAR_INTERRUPT );
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}
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/*-----------------------------------------------------------*/
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/* The ISR used depends on whether the preemptive or cooperative scheduler
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is being used. */
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#if( configUSE_PREEMPTION == 1 )
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static void __interrupt __far prvPreemptiveTick( void )
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{
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/* Get the scheduler to update the task states following the tick. */
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if( xTaskIncrementTick() != pdFALSE )
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{
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/* Switch in the context of the next task to be run. */
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portSWITCH_CONTEXT();
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}
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/* Reset interrupt. */
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outport( portEIO_REGISTER, portCLEAR_INTERRUPT );
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}
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#else
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static void __interrupt __far prvNonPreemptiveTick( void )
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{
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/* Same as preemptive tick, but the cooperative scheduler is being used
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so we don't have to switch in the context of the next task. */
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xTaskIncrementTick();
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/* Reset interrupt. */
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outport( portEIO_REGISTER, portCLEAR_INTERRUPT );
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}
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#endif
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/*-----------------------------------------------------------*/
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static void __interrupt __far prvYieldProcessor( void )
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{
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/* Switch in the context of the next task to be run. */
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portSWITCH_CONTEXT();
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}
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/*-----------------------------------------------------------*/
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void vPortEndScheduler( void )
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{
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/* Not implemented. */
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}
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/*-----------------------------------------------------------*/
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static void prvSetupTimerInterrupt( void )
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{
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const uint16_t usTimerACompare = portTIMER_COMPARE, usTimerAMode = portENABLE_TIMER_AND_INTERRUPT;
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const uint16_t usT2_IRQ = 0x13;
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/* Configure the timer, the dummy handler is used here as the init
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function leaves interrupts enabled. */
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t2_init( usTimerAMode, usTimerACompare, prvDummyISR );
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/* Disable interrupts again before installing the real handlers. */
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portDISABLE_INTERRUPTS();
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#if( configUSE_PREEMPTION == 1 )
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/* Tick service routine used by the scheduler when preemptive scheduling is
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being used. */
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setvect( usT2_IRQ, prvPreemptiveTick );
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#else
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/* Tick service routine used by the scheduler when cooperative scheduling is
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being used. */
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setvect( usT2_IRQ, prvNonPreemptiveTick );
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#endif
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}
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