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authorDominik Sliwa <dominik.sliwa@toradex.com>2018-10-30 16:31:29 +0100
committerDominik Sliwa <dominik.sliwa@toradex.com>2018-10-31 11:54:38 +0100
commit56e86c626df3dbf74c1021210636a7c5d92a49ce (patch)
tree54ba9581ad14d838d8926e4e6d673befad1f932c /freertos/Source/portable/GCC/ARM_CM3/port.c
parent4dfc5493fec8f6290457446b0478695b153da60a (diff)
Signed-off-by: Dominik Sliwa <dominik.sliwa@toradex.com>
Diffstat (limited to 'freertos/Source/portable/GCC/ARM_CM3/port.c')
-rw-r--r--freertos/Source/portable/GCC/ARM_CM3/port.c481
1 files changed, 0 insertions, 481 deletions
diff --git a/freertos/Source/portable/GCC/ARM_CM3/port.c b/freertos/Source/portable/GCC/ARM_CM3/port.c
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--- a/freertos/Source/portable/GCC/ARM_CM3/port.c
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-/*
- FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
- All rights reserved
-
- VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
-
- This file is part of the FreeRTOS distribution.
-
- FreeRTOS is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License (version 2) as published by the
- Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
-
- ***************************************************************************
- >>! NOTE: The modification to the GPL is included to allow you to !<<
- >>! distribute a combined work that includes FreeRTOS without being !<<
- >>! obliged to provide the source code for proprietary components !<<
- >>! outside of the FreeRTOS kernel. !<<
- ***************************************************************************
-
- FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- FOR A PARTICULAR PURPOSE. Full license text is available on the following
- link: http://www.freertos.org/a00114.html
-
- ***************************************************************************
- * *
- * FreeRTOS provides completely free yet professionally developed, *
- * robust, strictly quality controlled, supported, and cross *
- * platform software that is more than just the market leader, it *
- * is the industry's de facto standard. *
- * *
- * Help yourself get started quickly while simultaneously helping *
- * to support the FreeRTOS project by purchasing a FreeRTOS *
- * tutorial book, reference manual, or both: *
- * http://www.FreeRTOS.org/Documentation *
- * *
- ***************************************************************************
-
- http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
- the FAQ page "My application does not run, what could be wrong?". Have you
- defined configASSERT()?
-
- http://www.FreeRTOS.org/support - In return for receiving this top quality
- embedded software for free we request you assist our global community by
- participating in the support forum.
-
- http://www.FreeRTOS.org/training - Investing in training allows your team to
- be as productive as possible as early as possible. Now you can receive
- FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
- Ltd, and the world's leading authority on the world's leading RTOS.
-
- http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
- including FreeRTOS+Trace - an indispensable productivity tool, a DOS
- compatible FAT file system, and our tiny thread aware UDP/IP stack.
-
- http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
- Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
-
- http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
- Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
- licenses offer ticketed support, indemnification and commercial middleware.
-
- http://www.SafeRTOS.com - High Integrity Systems also provide a safety
- engineered and independently SIL3 certified version for use in safety and
- mission critical applications that require provable dependability.
-
- 1 tab == 4 spaces!
-*/
-
-/*-----------------------------------------------------------
- * Implementation of functions defined in portable.h for the ARM CM3 port.
- *----------------------------------------------------------*/
-
-/* Scheduler includes. */
-#include "FreeRTOS.h"
-#include "task.h"
-#include "fsl_tickless_generic.h"
-
-extern uint32_t SystemCoreClock; /* in Kinetis SDK, this contains the system core clock speed */
-
-/* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is
-defined. The value should also ensure backward compatibility.
-FreeRTOS.org versions prior to V4.4.0 did not include this definition. */
-#ifndef configKERNEL_INTERRUPT_PRIORITY
- #define configKERNEL_INTERRUPT_PRIORITY 255
-#endif
-
-
-
-#define portNVIC_PENDSV_PRI ( ( ( uint32_t ) configKERNEL_INTERRUPT_PRIORITY ) << 16UL )
-#define portNVIC_SYSTICK_PRI ( ( ( uint32_t ) configKERNEL_INTERRUPT_PRIORITY ) << 24UL )
-
-/* Constants required to check the validity of an interrupt priority. */
-#define portFIRST_USER_INTERRUPT_NUMBER ( 16 )
-#define portNVIC_IP_REGISTERS_OFFSET_16 ( 0xE000E3F0 )
-#define portAIRCR_REG ( * ( ( volatile uint32_t * ) 0xE000ED0C ) )
-#define portMAX_8_BIT_VALUE ( ( uint8_t ) 0xff )
-#define portTOP_BIT_OF_BYTE ( ( uint8_t ) 0x80 )
-#define portMAX_PRIGROUP_BITS ( ( uint8_t ) 7 )
-#define portPRIORITY_GROUP_MASK ( 0x07UL << 8UL )
-#define portPRIGROUP_SHIFT ( 8UL )
-
-/* Masks off all bits but the VECTACTIVE bits in the ICSR register. */
-#define portVECTACTIVE_MASK ( 0xFFUL )
-
-/* Constants required to set up the initial stack. */
-#define portINITIAL_XPSR ( 0x01000000UL )
-
-
-
-/* For strict compliance with the Cortex-M spec the task start address should
-have bit-0 clear, as it is loaded into the PC on exit from an ISR. */
-#define portSTART_ADDRESS_MASK ( ( StackType_t ) 0xfffffffeUL )
-
-/* Let the user override the pre-loading of the initial LR with the address of
-prvTaskExitError() in case it messes up unwinding of the stack in the
-debugger. */
-#ifdef configTASK_RETURN_ADDRESS
- #define portTASK_RETURN_ADDRESS configTASK_RETURN_ADDRESS
-#else
- #define portTASK_RETURN_ADDRESS prvTaskExitError
-#endif
-
-/* Each task maintains its own interrupt status in the critical nesting
-variable. */
-static UBaseType_t uxCriticalNesting = 0xaaaaaaaa;
-
-/*
- * Exception handlers.
- */
-void xPortPendSVHandler( void ) __attribute__ (( naked ));
-void xPortSysTickHandler( void );
-void vPortSVCHandler( void ) __attribute__ (( naked ));
-
-/*
- * Start first task is a separate function so it can be tested in isolation.
- */
-static void prvPortStartFirstTask( void ) __attribute__ (( naked ));
-
-/*
- * Used to catch tasks that attempt to return from their implementing function.
- */
-static void prvTaskExitError( void );
-
-/*-----------------------------------------------------------*/
-
-/*
- * Used by the portASSERT_IF_INTERRUPT_PRIORITY_INVALID() macro to ensure
- * FreeRTOS API functions are not called from interrupts that have been assigned
- * a priority above configMAX_SYSCALL_INTERRUPT_PRIORITY.
- */
-#if ( configASSERT_DEFINED == 1 )
- static uint8_t ucMaxSysCallPriority = 0;
- static uint32_t ulMaxPRIGROUPValue = 0;
- static const volatile uint8_t * const pcInterruptPriorityRegisters = ( const volatile uint8_t * const ) portNVIC_IP_REGISTERS_OFFSET_16;
-#endif /* configASSERT_DEFINED */
-
-/*-----------------------------------------------------------*/
-
-/*
- * See header file for description.
- */
-StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
-{
- /* Simulate the stack frame as it would be created by a context switch
- interrupt. */
- pxTopOfStack--; /* Offset added to account for the way the MCU uses the stack on entry/exit of interrupts. */
- *pxTopOfStack = portINITIAL_XPSR; /* xPSR */
- pxTopOfStack--;
- *pxTopOfStack = ( ( StackType_t ) pxCode ) & portSTART_ADDRESS_MASK; /* PC */
- pxTopOfStack--;
- *pxTopOfStack = ( StackType_t ) portTASK_RETURN_ADDRESS; /* LR */
- pxTopOfStack -= 5; /* R12, R3, R2 and R1. */
- *pxTopOfStack = ( StackType_t ) pvParameters; /* R0 */
- pxTopOfStack -= 8; /* R11, R10, R9, R8, R7, R6, R5 and R4. */
-
- return pxTopOfStack;
-}
-/*-----------------------------------------------------------*/
-
-static void prvTaskExitError( void )
-{
- /* 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( uxCriticalNesting == ~0UL );
- portDISABLE_INTERRUPTS();
- for( ;; );
-}
-/*-----------------------------------------------------------*/
-
-void vPortSVCHandler( void )
-{
- __asm volatile (
- " ldr r3, pxCurrentTCBConst2 \n" /* Restore the context. */
- " ldr r1, [r3] \n" /* Use pxCurrentTCBConst to get the pxCurrentTCB address. */
- " ldr r0, [r1] \n" /* The first item in pxCurrentTCB is the task top of stack. */
- " ldmia r0!, {r4-r11} \n" /* Pop the registers that are not automatically saved on exception entry and the critical nesting count. */
- " msr psp, r0 \n" /* Restore the task stack pointer. */
- " isb \n"
- " mov r0, #0 \n"
- " msr basepri, r0 \n"
- " orr r14, #0xd \n"
- " bx r14 \n"
- " \n"
- " .align 4 \n"
- "pxCurrentTCBConst2: .word pxCurrentTCB \n"
- );
-}
-/*-----------------------------------------------------------*/
-
-static void prvPortStartFirstTask( void )
-{
- __asm volatile(
- " ldr r0, =0xE000ED08 \n" /* Use the NVIC offset register to locate the stack. */
- " ldr r0, [r0] \n"
- " ldr r0, [r0] \n"
- " msr msp, r0 \n" /* Set the msp back to the start of the stack. */
- " cpsie i \n" /* Globally enable interrupts. */
- " cpsie f \n"
- " dsb \n"
- " isb \n"
- " svc 0 \n" /* System call to start first task. */
- " nop \n"
- );
-}
-/*-----------------------------------------------------------*/
-
-/*
- * See header file for description.
- */
-BaseType_t xPortStartScheduler( void )
-{
- /* configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to 0.
- See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
- configASSERT( configMAX_SYSCALL_INTERRUPT_PRIORITY );
-
- #if( configASSERT_DEFINED == 1 )
- {
- volatile uint32_t ulOriginalPriority;
- volatile uint8_t * const pucFirstUserPriorityRegister = ( volatile uint8_t * const ) ( portNVIC_IP_REGISTERS_OFFSET_16 + portFIRST_USER_INTERRUPT_NUMBER );
- volatile uint8_t ucMaxPriorityValue;
-
- /* Determine the maximum priority from which ISR safe FreeRTOS API
- functions can be called. ISR safe functions are those that end in
- "FromISR". FreeRTOS maintains separate thread and ISR API functions to
- ensure interrupt entry is as fast and simple as possible.
-
- Save the interrupt priority value that is about to be clobbered. */
- ulOriginalPriority = *pucFirstUserPriorityRegister;
-
- /* Determine the number of priority bits available. First write to all
- possible bits. */
- *pucFirstUserPriorityRegister = portMAX_8_BIT_VALUE;
-
- /* Read the value back to see how many bits stuck. */
- ucMaxPriorityValue = *pucFirstUserPriorityRegister;
-
- /* Use the same mask on the maximum system call priority. */
- ucMaxSysCallPriority = configMAX_SYSCALL_INTERRUPT_PRIORITY & ucMaxPriorityValue;
-
- /* Calculate the maximum acceptable priority group value for the number
- of bits read back. */
- ulMaxPRIGROUPValue = portMAX_PRIGROUP_BITS;
- while( ( ucMaxPriorityValue & portTOP_BIT_OF_BYTE ) == portTOP_BIT_OF_BYTE )
- {
- ulMaxPRIGROUPValue--;
- ucMaxPriorityValue <<= ( uint8_t ) 0x01;
- }
-
- /* Shift the priority group value back to its position within the AIRCR
- register. */
- ulMaxPRIGROUPValue <<= portPRIGROUP_SHIFT;
- ulMaxPRIGROUPValue &= portPRIORITY_GROUP_MASK;
-
- /* Restore the clobbered interrupt priority register to its original
- value. */
- *pucFirstUserPriorityRegister = ulOriginalPriority;
- }
- #endif /* conifgASSERT_DEFINED */
-
- /* Make PendSV and SysTick the lowest priority interrupts. */
- portNVIC_SYSPRI2_REG |= portNVIC_PENDSV_PRI;
- portNVIC_SYSPRI2_REG |= portNVIC_SYSTICK_PRI;
-
- /* Start the timer that generates the tick ISR. Interrupts are disabled
- here already. */
- vPortSetupTimerInterrupt();
-
- /* Initialise the critical nesting count ready for the first task. */
- uxCriticalNesting = 0;
-
- /* Start the first task. */
- prvPortStartFirstTask();
-
- /* Should never get here as the tasks will now be executing! Call the task
- exit error function to prevent compiler warnings about a static function
- not being called in the case that the application writer overrides this
- functionality by defining configTASK_RETURN_ADDRESS. */
- prvTaskExitError();
-
- /* Should not get here! */
- return 0;
-}
-/*-----------------------------------------------------------*/
-
-void vPortEndScheduler( void )
-{
- /* Not implemented in ports where there is nothing to return to.
- Artificially force an assert. */
- configASSERT( uxCriticalNesting == 1000UL );
-}
-/*-----------------------------------------------------------*/
-
-void vPortEnterCritical( void )
-{
- portDISABLE_INTERRUPTS();
- uxCriticalNesting++;
-
- /* This is not the interrupt safe version of the enter critical function so
- assert() if it is being called from an interrupt context. Only API
- functions that end in "FromISR" can be used in an interrupt. Only assert if
- the critical nesting count is 1 to protect against recursive calls if the
- assert function also uses a critical section. */
- if( uxCriticalNesting == 1 )
- {
- configASSERT( ( portNVIC_INT_CTRL_REG & portVECTACTIVE_MASK ) == 0 );
- }
-}
-/*-----------------------------------------------------------*/
-
-void vPortExitCritical( void )
-{
- configASSERT( uxCriticalNesting );
- uxCriticalNesting--;
- if( uxCriticalNesting == 0 )
- {
- portENABLE_INTERRUPTS();
- }
-}
-/*-----------------------------------------------------------*/
-
-void xPortPendSVHandler( void )
-{
- /* This is a naked function. */
-
- __asm volatile
- (
- " mrs r0, psp \n"
- " isb \n"
- " \n"
- " ldr r3, pxCurrentTCBConst \n" /* Get the location of the current TCB. */
- " ldr r2, [r3] \n"
- " \n"
- " stmdb r0!, {r4-r11} \n" /* Save the remaining registers. */
- " str r0, [r2] \n" /* Save the new top of stack into the first member of the TCB. */
- " \n"
- " stmdb sp!, {r3, r14} \n"
- " mov r0, %0 \n"
- " msr basepri, r0 \n"
- " bl vTaskSwitchContext \n"
- " mov r0, #0 \n"
- " msr basepri, r0 \n"
- " ldmia sp!, {r3, r14} \n"
- " \n" /* Restore the context, including the critical nesting count. */
- " ldr r1, [r3] \n"
- " ldr r0, [r1] \n" /* The first item in pxCurrentTCB is the task top of stack. */
- " ldmia r0!, {r4-r11} \n" /* Pop the registers. */
- " msr psp, r0 \n"
- " isb \n"
- " bx r14 \n"
- " \n"
- " .align 4 \n"
- "pxCurrentTCBConst: .word pxCurrentTCB \n"
- ::"i"(configMAX_SYSCALL_INTERRUPT_PRIORITY)
- );
-}
-/*-----------------------------------------------------------*/
-
-void xPortSysTickHandler( void )
-{
- /* The SysTick runs at the lowest interrupt priority, so when this interrupt
- executes all interrupts must be unmasked. There is therefore no need to
- save and then restore the interrupt mask value as its value is already
- known. */
- portDISABLE_INTERRUPTS();
- {
- /* Increment the RTOS tick. */
- if( xTaskIncrementTick() != pdFALSE )
- {
- /* A context switch is required. Context switching is performed in
- the PendSV interrupt. Pend the PendSV interrupt. */
- portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
- }
- }
- portENABLE_INTERRUPTS();
-}
-
-#if( configASSERT_DEFINED == 1 )
-
- void vPortValidateInterruptPriority( void )
- {
- uint32_t ulCurrentInterrupt;
- uint8_t ucCurrentPriority;
-
- /* Obtain the number of the currently executing interrupt. */
- __asm volatile( "mrs %0, ipsr" : "=r"( ulCurrentInterrupt ) );
-
- /* Is the interrupt number a user defined interrupt? */
- if( ulCurrentInterrupt >= portFIRST_USER_INTERRUPT_NUMBER )
- {
- /* Look up the interrupt's priority. */
- ucCurrentPriority = pcInterruptPriorityRegisters[ ulCurrentInterrupt ];
-
- /* The following assertion will fail if a service routine (ISR) for
- an interrupt that has been assigned a priority above
- configMAX_SYSCALL_INTERRUPT_PRIORITY calls an ISR safe FreeRTOS API
- function. ISR safe FreeRTOS API functions must *only* be called
- from interrupts that have been assigned a priority at or below
- configMAX_SYSCALL_INTERRUPT_PRIORITY.
-
- Numerically low interrupt priority numbers represent logically high
- interrupt priorities, therefore the priority of the interrupt must
- be set to a value equal to or numerically *higher* than
- configMAX_SYSCALL_INTERRUPT_PRIORITY.
-
- Interrupts that use the FreeRTOS API must not be left at their
- default priority of zero as that is the highest possible priority,
- which is guaranteed to be above configMAX_SYSCALL_INTERRUPT_PRIORITY,
- and therefore also guaranteed to be invalid.
-
- FreeRTOS maintains separate thread and ISR API functions to ensure
- interrupt entry is as fast and simple as possible.
-
- The following links provide detailed information:
- http://www.freertos.org/RTOS-Cortex-M3-M4.html
- http://www.freertos.org/FAQHelp.html */
- configASSERT( ucCurrentPriority >= ucMaxSysCallPriority );
- }
-
- /* Priority grouping: The interrupt controller (NVIC) allows the bits
- that define each interrupt's priority to be split between bits that
- define the interrupt's pre-emption priority bits and bits that define
- the interrupt's sub-priority. For simplicity all bits must be defined
- to be pre-emption priority bits. The following assertion will fail if
- this is not the case (if some bits represent a sub-priority).
-
- If the application only uses CMSIS libraries for interrupt
- configuration then the correct setting can be achieved on all Cortex-M
- devices by calling NVIC_SetPriorityGrouping( 0 ); before starting the
- scheduler. Note however that some vendor specific peripheral libraries
- assume a non-zero priority group setting, in which cases using a value
- of zero will result in unpredicable behaviour. */
- configASSERT( ( portAIRCR_REG & portPRIORITY_GROUP_MASK ) <= ulMaxPRIGROUPValue );
- }
-
-#endif /* configASSERT_DEFINED */
-
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