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- /*
- * FreeRTOS Kernel <DEVELOPMENT BRANCH>
- * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * SPDX-License-Identifier: MIT
- *
- * 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.
- *
- * https://www.FreeRTOS.org
- * https://github.com/FreeRTOS
- *
- */
- /* Standard includes. */
- #include <stdlib.h>
- /* Scheduler includes. */
- #include "FreeRTOS.h"
- #include "task.h"
- #ifndef configINTERRUPT_CONTROLLER_BASE_ADDRESS
- #error "configINTERRUPT_CONTROLLER_BASE_ADDRESS must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
- #endif
- #ifndef configINTERRUPT_CONTROLLER_CPU_INTERFACE_OFFSET
- #error "configINTERRUPT_CONTROLLER_CPU_INTERFACE_OFFSET must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
- #endif
- #ifndef configUNIQUE_INTERRUPT_PRIORITIES
- #error "configUNIQUE_INTERRUPT_PRIORITIES must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
- #endif
- #ifndef configSETUP_TICK_INTERRUPT
- #error "configSETUP_TICK_INTERRUPT() must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
- #endif /* configSETUP_TICK_INTERRUPT */
- #ifndef configMAX_API_CALL_INTERRUPT_PRIORITY
- #error "configMAX_API_CALL_INTERRUPT_PRIORITY must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
- #endif
- #if configMAX_API_CALL_INTERRUPT_PRIORITY == 0
- #error "configMAX_API_CALL_INTERRUPT_PRIORITY must not be set to 0"
- #endif
- #if configMAX_API_CALL_INTERRUPT_PRIORITY > configUNIQUE_INTERRUPT_PRIORITIES
- #error "configMAX_API_CALL_INTERRUPT_PRIORITY must be less than or equal to configUNIQUE_INTERRUPT_PRIORITIES as the lower the numeric priority value the higher the logical interrupt priority"
- #endif
- #if configUSE_PORT_OPTIMISED_TASK_SELECTION == 1
- /* Check the configuration. */
- #if ( configMAX_PRIORITIES > 32 )
- #error "configUSE_PORT_OPTIMISED_TASK_SELECTION can only be set to 1 when configMAX_PRIORITIES is less than or equal to 32. It is very rare that a system requires more than 10 to 15 difference priorities as tasks that share a priority will time slice."
- #endif
- #endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
- /* In case security extensions are implemented. */
- #if configMAX_API_CALL_INTERRUPT_PRIORITY <= ( configUNIQUE_INTERRUPT_PRIORITIES / 2 )
- #error "configMAX_API_CALL_INTERRUPT_PRIORITY must be greater than ( configUNIQUE_INTERRUPT_PRIORITIES / 2 )"
- #endif
- /* Some vendor specific files default configCLEAR_TICK_INTERRUPT() in
- * portmacro.h. */
- #ifndef configCLEAR_TICK_INTERRUPT
- #define configCLEAR_TICK_INTERRUPT()
- #endif
- /* A critical section is exited when the critical section nesting count reaches
- * this value. */
- #define portNO_CRITICAL_NESTING ( ( size_t ) 0 )
- /* In all GICs 255 can be written to the priority mask register to unmask all
- * (but the lowest) interrupt priority. */
- #define portUNMASK_VALUE ( 0xFFUL )
- /* Tasks are not created with a floating point context, but can be given a
- * floating point context after they have been created. A variable is stored as
- * part of the tasks context that holds portNO_FLOATING_POINT_CONTEXT if the task
- * does not have an FPU context, or any other value if the task does have an FPU
- * context. */
- #define portNO_FLOATING_POINT_CONTEXT ( ( StackType_t ) 0 )
- /* Constants required to setup the initial task context. */
- #define portSP_ELx ( ( StackType_t ) 0x01 )
- #define portSP_EL0 ( ( StackType_t ) 0x00 )
- #if defined( GUEST )
- #define portEL1 ( ( StackType_t ) 0x04 )
- #define portINITIAL_PSTATE ( portEL1 | portSP_EL0 )
- #else
- #define portEL3 ( ( StackType_t ) 0x0c )
- /* At the time of writing, the BSP only supports EL3. */
- #define portINITIAL_PSTATE ( portEL3 | portSP_EL0 )
- #endif
- /* Used by portASSERT_IF_INTERRUPT_PRIORITY_INVALID() when ensuring the binary
- * point is zero. */
- #define portBINARY_POINT_BITS ( ( uint8_t ) 0x03 )
- /* Masks all bits in the APSR other than the mode bits. */
- #define portAPSR_MODE_BITS_MASK ( 0x0C )
- /* The I bit in the DAIF bits. */
- #define portDAIF_I ( 0x80 )
- /* Macro to unmask all interrupt priorities. */
- #define portCLEAR_INTERRUPT_MASK() \
- { \
- portDISABLE_INTERRUPTS(); \
- portICCPMR_PRIORITY_MASK_REGISTER = portUNMASK_VALUE; \
- __asm volatile ( "DSB SY \n" \
- "ISB SY \n" ); \
- portENABLE_INTERRUPTS(); \
- }
- /* Hardware specifics used when sanity checking the configuration. */
- #define portINTERRUPT_PRIORITY_REGISTER_OFFSET 0x400UL
- #define portMAX_8_BIT_VALUE ( ( uint8_t ) 0xff )
- #define portBIT_0_SET ( ( uint8_t ) 0x01 )
- /* The space on the stack required to hold the FPU registers.
- * There are 32 128-bit registers.*/
- #define portFPU_REGISTER_WORDS ( 32 * 2 )
- /*-----------------------------------------------------------*/
- /*
- * Starts the first task executing. This function is necessarily written in
- * assembly code so is implemented in portASM.s.
- */
- extern void vPortRestoreTaskContext( void );
- /*-----------------------------------------------------------*/
- /* A variable is used to keep track of the critical section nesting. This
- * variable has to be stored as part of the task context and must be initialised to
- * a non zero value to ensure interrupts don't inadvertently become unmasked before
- * the scheduler starts. As it is stored as part of the task context it will
- * automatically be set to 0 when the first task is started. */
- volatile uint64_t ullCriticalNesting = 9999ULL;
- /* Saved as part of the task context. If ullPortTaskHasFPUContext is non-zero
- * then floating point context must be saved and restored for the task. */
- uint64_t ullPortTaskHasFPUContext = pdFALSE;
- /* Set to 1 to pend a context switch from an ISR. */
- uint64_t ullPortYieldRequired = pdFALSE;
- /* Counts the interrupt nesting depth. A context switch is only performed if
- * if the nesting depth is 0. */
- uint64_t ullPortInterruptNesting = 0;
- /* Used in the ASM code. */
- __attribute__( ( used ) ) const uint64_t ullICCEOIR = portICCEOIR_END_OF_INTERRUPT_REGISTER_ADDRESS;
- __attribute__( ( used ) ) const uint64_t ullICCIAR = portICCIAR_INTERRUPT_ACKNOWLEDGE_REGISTER_ADDRESS;
- __attribute__( ( used ) ) const uint64_t ullICCPMR = portICCPMR_PRIORITY_MASK_REGISTER_ADDRESS;
- __attribute__( ( used ) ) const uint64_t ullMaxAPIPriorityMask = ( configMAX_API_CALL_INTERRUPT_PRIORITY << portPRIORITY_SHIFT );
- /*-----------------------------------------------------------*/
- /*
- * See header file for description.
- */
- StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
- TaskFunction_t pxCode,
- void * pvParameters )
- {
- /* Setup the initial stack of the task. The stack is set exactly as
- * expected by the portRESTORE_CONTEXT() macro. */
- /* First all the general purpose registers. */
- pxTopOfStack--;
- *pxTopOfStack = 0x0101010101010101ULL; /* R1 */
- pxTopOfStack--;
- *pxTopOfStack = ( StackType_t ) pvParameters; /* R0 */
- pxTopOfStack--;
- *pxTopOfStack = 0x0303030303030303ULL; /* R3 */
- pxTopOfStack--;
- *pxTopOfStack = 0x0202020202020202ULL; /* R2 */
- pxTopOfStack--;
- *pxTopOfStack = 0x0505050505050505ULL; /* R5 */
- pxTopOfStack--;
- *pxTopOfStack = 0x0404040404040404ULL; /* R4 */
- pxTopOfStack--;
- *pxTopOfStack = 0x0707070707070707ULL; /* R7 */
- pxTopOfStack--;
- *pxTopOfStack = 0x0606060606060606ULL; /* R6 */
- pxTopOfStack--;
- *pxTopOfStack = 0x0909090909090909ULL; /* R9 */
- pxTopOfStack--;
- *pxTopOfStack = 0x0808080808080808ULL; /* R8 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1111111111111111ULL; /* R11 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1010101010101010ULL; /* R10 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1313131313131313ULL; /* R13 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1212121212121212ULL; /* R12 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1515151515151515ULL; /* R15 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1414141414141414ULL; /* R14 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1717171717171717ULL; /* R17 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1616161616161616ULL; /* R16 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1919191919191919ULL; /* R19 */
- pxTopOfStack--;
- *pxTopOfStack = 0x1818181818181818ULL; /* R18 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2121212121212121ULL; /* R21 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2020202020202020ULL; /* R20 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2323232323232323ULL; /* R23 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2222222222222222ULL; /* R22 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2525252525252525ULL; /* R25 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2424242424242424ULL; /* R24 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2727272727272727ULL; /* R27 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2626262626262626ULL; /* R26 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2929292929292929ULL; /* R29 */
- pxTopOfStack--;
- *pxTopOfStack = 0x2828282828282828ULL; /* R28 */
- pxTopOfStack--;
- *pxTopOfStack = ( StackType_t ) 0x00; /* XZR - has no effect, used so there are an even number of registers. */
- pxTopOfStack--;
- *pxTopOfStack = ( StackType_t ) 0x00; /* R30 - procedure call link register. */
- pxTopOfStack--;
- *pxTopOfStack = portINITIAL_PSTATE;
- pxTopOfStack--;
- *pxTopOfStack = ( StackType_t ) pxCode; /* Exception return address. */
- #if ( configUSE_TASK_FPU_SUPPORT == 1 )
- {
- /* The task will start with a critical nesting count of 0 as interrupts are
- * enabled. */
- pxTopOfStack--;
- *pxTopOfStack = portNO_CRITICAL_NESTING;
- /* The task will start without a floating point context. A task that
- * uses the floating point hardware must call vPortTaskUsesFPU() before
- * executing any floating point instructions. */
- pxTopOfStack--;
- *pxTopOfStack = portNO_FLOATING_POINT_CONTEXT;
- }
- #elif ( configUSE_TASK_FPU_SUPPORT == 2 )
- {
- /* The task will start with a floating point context. Leave enough
- * space for the registers - and ensure they are initialised to 0. */
- pxTopOfStack -= portFPU_REGISTER_WORDS;
- memset( pxTopOfStack, 0x00, portFPU_REGISTER_WORDS * sizeof( StackType_t ) );
- /* The task will start with a critical nesting count of 0 as interrupts are
- * enabled. */
- pxTopOfStack--;
- *pxTopOfStack = portNO_CRITICAL_NESTING;
- pxTopOfStack--;
- *pxTopOfStack = pdTRUE;
- ullPortTaskHasFPUContext = pdTRUE;
- }
- #else /* if ( configUSE_TASK_FPU_SUPPORT == 1 ) */
- {
- #error "Invalid configUSE_TASK_FPU_SUPPORT setting - configUSE_TASK_FPU_SUPPORT must be set to 1, 2, or left undefined."
- }
- #endif /* if ( configUSE_TASK_FPU_SUPPORT == 1 ) */
- return pxTopOfStack;
- }
- /*-----------------------------------------------------------*/
- BaseType_t xPortStartScheduler( void )
- {
- uint32_t ulAPSR;
- #if ( configASSERT_DEFINED == 1 )
- {
- volatile uint8_t ucOriginalPriority;
- volatile uint8_t * const pucFirstUserPriorityRegister = ( volatile uint8_t * const ) ( configINTERRUPT_CONTROLLER_BASE_ADDRESS + portINTERRUPT_PRIORITY_REGISTER_OFFSET );
- volatile uint8_t ucMaxPriorityValue;
- /* Determine how many priority bits are implemented in the GIC.
- *
- * Save the interrupt priority value that is about to be clobbered. */
- ucOriginalPriority = *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;
- /* Shift to the least significant bits. */
- while( ( ucMaxPriorityValue & portBIT_0_SET ) != portBIT_0_SET )
- {
- ucMaxPriorityValue >>= ( uint8_t ) 0x01;
- }
- /* Sanity check configUNIQUE_INTERRUPT_PRIORITIES matches the read
- * value. */
- configASSERT( ucMaxPriorityValue >= portLOWEST_INTERRUPT_PRIORITY );
- /* Restore the clobbered interrupt priority register to its original
- * value. */
- *pucFirstUserPriorityRegister = ucOriginalPriority;
- }
- #endif /* configASSERT_DEFINED */
- /* At the time of writing, the BSP only supports EL3. */
- __asm volatile ( "MRS %0, CurrentEL" : "=r" ( ulAPSR ) );
- ulAPSR &= portAPSR_MODE_BITS_MASK;
- #if defined( GUEST )
- #warning "Building for execution as a guest under XEN. THIS IS NOT A FULLY TESTED PATH."
- configASSERT( ulAPSR == portEL1 );
- if( ulAPSR == portEL1 )
- #else
- configASSERT( ulAPSR == portEL3 );
- if( ulAPSR == portEL3 )
- #endif
- {
- /* Only continue if the binary point value is set to its lowest possible
- * setting. See the comments in vPortValidateInterruptPriority() below for
- * more information. */
- configASSERT( ( portICCBPR_BINARY_POINT_REGISTER & portBINARY_POINT_BITS ) <= portMAX_BINARY_POINT_VALUE );
- if( ( portICCBPR_BINARY_POINT_REGISTER & portBINARY_POINT_BITS ) <= portMAX_BINARY_POINT_VALUE )
- {
- /* Interrupts are turned off in the CPU itself to ensure a tick does
- * not execute while the scheduler is being started. Interrupts are
- * automatically turned back on in the CPU when the first task starts
- * executing. */
- portDISABLE_INTERRUPTS();
- /* Start the timer that generates the tick ISR. */
- configSETUP_TICK_INTERRUPT();
- /* Start the first task executing. */
- vPortRestoreTaskContext();
- }
- }
- return 0;
- }
- /*-----------------------------------------------------------*/
- void vPortEndScheduler( void )
- {
- /* Not implemented in ports where there is nothing to return to.
- * Artificially force an assert. */
- configASSERT( ullCriticalNesting == 1000ULL );
- }
- /*-----------------------------------------------------------*/
- void vPortEnterCritical( void )
- {
- /* Mask interrupts up to the max syscall interrupt priority. */
- uxPortSetInterruptMask();
- /* Now interrupts are disabled ullCriticalNesting can be accessed
- * directly. Increment ullCriticalNesting to keep a count of how many times
- * portENTER_CRITICAL() has been called. */
- ullCriticalNesting++;
- /* 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( ullCriticalNesting == 1ULL )
- {
- configASSERT( ullPortInterruptNesting == 0 );
- }
- }
- /*-----------------------------------------------------------*/
- void vPortExitCritical( void )
- {
- if( ullCriticalNesting > portNO_CRITICAL_NESTING )
- {
- /* Decrement the nesting count as the critical section is being
- * exited. */
- ullCriticalNesting--;
- /* If the nesting level has reached zero then all interrupt
- * priorities must be re-enabled. */
- if( ullCriticalNesting == portNO_CRITICAL_NESTING )
- {
- /* Critical nesting has reached zero so all interrupt priorities
- * should be unmasked. */
- portCLEAR_INTERRUPT_MASK();
- }
- }
- }
- /*-----------------------------------------------------------*/
- void FreeRTOS_Tick_Handler( void )
- {
- /* Must be the lowest possible priority. */
- #if !defined( QEMU )
- {
- configASSERT( portICCRPR_RUNNING_PRIORITY_REGISTER == ( uint32_t ) ( portLOWEST_USABLE_INTERRUPT_PRIORITY << portPRIORITY_SHIFT ) );
- }
- #endif
- /* Interrupts should not be enabled before this point. */
- #if ( configASSERT_DEFINED == 1 )
- {
- uint32_t ulMaskBits;
- __asm volatile ( "mrs %0, daif" : "=r" ( ulMaskBits )::"memory" );
- configASSERT( ( ulMaskBits & portDAIF_I ) != 0 );
- }
- #endif /* configASSERT_DEFINED */
- /* Set interrupt mask before altering scheduler structures. The tick
- * handler runs at the lowest priority, so interrupts cannot already be masked,
- * so there is no need to save and restore the current mask value. It is
- * necessary to turn off interrupts in the CPU itself while the ICCPMR is being
- * updated. */
- portICCPMR_PRIORITY_MASK_REGISTER = ( uint32_t ) ( configMAX_API_CALL_INTERRUPT_PRIORITY << portPRIORITY_SHIFT );
- __asm volatile ( "dsb sy \n"
- "isb sy \n" ::: "memory" );
- /* Ok to enable interrupts after the interrupt source has been cleared. */
- configCLEAR_TICK_INTERRUPT();
- portENABLE_INTERRUPTS();
- /* Increment the RTOS tick. */
- if( xTaskIncrementTick() != pdFALSE )
- {
- ullPortYieldRequired = pdTRUE;
- }
- /* Ensure all interrupt priorities are active again. */
- portCLEAR_INTERRUPT_MASK();
- }
- /*-----------------------------------------------------------*/
- #if ( configUSE_TASK_FPU_SUPPORT != 2 )
- void vPortTaskUsesFPU( void )
- {
- /* A task is registering the fact that it needs an FPU context. Set the
- * FPU flag (which is saved as part of the task context). */
- ullPortTaskHasFPUContext = pdTRUE;
- /* Consider initialising the FPSR here - but probably not necessary in
- * AArch64. */
- }
- #endif /* configUSE_TASK_FPU_SUPPORT */
- /*-----------------------------------------------------------*/
- void vPortClearInterruptMask( UBaseType_t uxNewMaskValue )
- {
- if( uxNewMaskValue == pdFALSE )
- {
- portCLEAR_INTERRUPT_MASK();
- }
- }
- /*-----------------------------------------------------------*/
- UBaseType_t uxPortSetInterruptMask( void )
- {
- uint32_t ulReturn;
- /* Interrupt in the CPU must be turned off while the ICCPMR is being
- * updated. */
- portDISABLE_INTERRUPTS();
- if( portICCPMR_PRIORITY_MASK_REGISTER == ( uint32_t ) ( configMAX_API_CALL_INTERRUPT_PRIORITY << portPRIORITY_SHIFT ) )
- {
- /* Interrupts were already masked. */
- ulReturn = pdTRUE;
- }
- else
- {
- ulReturn = pdFALSE;
- portICCPMR_PRIORITY_MASK_REGISTER = ( uint32_t ) ( configMAX_API_CALL_INTERRUPT_PRIORITY << portPRIORITY_SHIFT );
- __asm volatile ( "dsb sy \n"
- "isb sy \n" ::: "memory" );
- }
- portENABLE_INTERRUPTS();
- return ulReturn;
- }
- /*-----------------------------------------------------------*/
- #if ( configASSERT_DEFINED == 1 )
- void vPortValidateInterruptPriority( void )
- {
- /* 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.
- *
- * FreeRTOS maintains separate thread and ISR API functions to ensure
- * interrupt entry is as fast and simple as possible. */
- configASSERT( portICCRPR_RUNNING_PRIORITY_REGISTER >= ( uint32_t ) ( configMAX_API_CALL_INTERRUPT_PRIORITY << portPRIORITY_SHIFT ) );
- /* Priority grouping: The interrupt controller (GIC) 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).
- *
- * The priority grouping is configured by the GIC's binary point register
- * (ICCBPR). Writing 0 to ICCBPR will ensure it is set to its lowest
- * possible value (which may be above 0). */
- configASSERT( ( portICCBPR_BINARY_POINT_REGISTER & portBINARY_POINT_BITS ) <= portMAX_BINARY_POINT_VALUE );
- }
- #endif /* configASSERT_DEFINED */
- /*-----------------------------------------------------------*/
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