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55eceb2203
* Add configUSE_TASK_FPU_SUPPORT to AARCH64 port NEON SIMD is required by standard AARCH64 and its registers are frequently utilized by standard functions such as memcpy(). This means that even simple tasks that do not use any floating point arithmetics may still alter the contents of the FPU registers. For this reason it makes sense to add support for configUSE_TASK_FPU_SUPPORT to be able to enforce FPU register saving and restoring globally. The implementation was largely adopted from the ARM_CA9 port. However, the FPU registers must be placed on the stack before the critical nesting count to match the AARCH64 portASM.S.
557 lines
22 KiB
C
557 lines
22 KiB
C
/*
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* FreeRTOS Kernel <DEVELOPMENT BRANCH>
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* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* SPDX-License-Identifier: MIT
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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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*/
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/* Standard includes. */
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#include <stdlib.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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#ifndef configINTERRUPT_CONTROLLER_BASE_ADDRESS
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#error "configINTERRUPT_CONTROLLER_BASE_ADDRESS must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
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#endif
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#ifndef configINTERRUPT_CONTROLLER_CPU_INTERFACE_OFFSET
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#error "configINTERRUPT_CONTROLLER_CPU_INTERFACE_OFFSET must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
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#endif
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#ifndef configUNIQUE_INTERRUPT_PRIORITIES
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#error "configUNIQUE_INTERRUPT_PRIORITIES must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
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#endif
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#ifndef configSETUP_TICK_INTERRUPT
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#error "configSETUP_TICK_INTERRUPT() must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
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#endif /* configSETUP_TICK_INTERRUPT */
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#ifndef configMAX_API_CALL_INTERRUPT_PRIORITY
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#error "configMAX_API_CALL_INTERRUPT_PRIORITY must be defined. See www.FreeRTOS.org/Using-FreeRTOS-on-Cortex-A-Embedded-Processors.html"
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#endif
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#if configMAX_API_CALL_INTERRUPT_PRIORITY == 0
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#error "configMAX_API_CALL_INTERRUPT_PRIORITY must not be set to 0"
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#endif
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#if configMAX_API_CALL_INTERRUPT_PRIORITY > configUNIQUE_INTERRUPT_PRIORITIES
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#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"
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#endif
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#if configUSE_PORT_OPTIMISED_TASK_SELECTION == 1
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/* Check the configuration. */
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#if ( configMAX_PRIORITIES > 32 )
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#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."
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#endif
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#endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
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/* In case security extensions are implemented. */
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#if configMAX_API_CALL_INTERRUPT_PRIORITY <= ( configUNIQUE_INTERRUPT_PRIORITIES / 2 )
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#error "configMAX_API_CALL_INTERRUPT_PRIORITY must be greater than ( configUNIQUE_INTERRUPT_PRIORITIES / 2 )"
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#endif
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/* Some vendor specific files default configCLEAR_TICK_INTERRUPT() in
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* portmacro.h. */
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#ifndef configCLEAR_TICK_INTERRUPT
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#define configCLEAR_TICK_INTERRUPT()
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#endif
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/* A critical section is exited when the critical section nesting count reaches
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* this value. */
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#define portNO_CRITICAL_NESTING ( ( size_t ) 0 )
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/* In all GICs 255 can be written to the priority mask register to unmask all
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* (but the lowest) interrupt priority. */
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#define portUNMASK_VALUE ( 0xFFUL )
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/* Tasks are not created with a floating point context, but can be given a
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* floating point context after they have been created. A variable is stored as
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* part of the tasks context that holds portNO_FLOATING_POINT_CONTEXT if the task
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* does not have an FPU context, or any other value if the task does have an FPU
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* context. */
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#define portNO_FLOATING_POINT_CONTEXT ( ( StackType_t ) 0 )
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/* Constants required to setup the initial task context. */
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#define portSP_ELx ( ( StackType_t ) 0x01 )
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#define portSP_EL0 ( ( StackType_t ) 0x00 )
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#if defined( GUEST )
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#define portEL1 ( ( StackType_t ) 0x04 )
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#define portINITIAL_PSTATE ( portEL1 | portSP_EL0 )
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#else
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#define portEL3 ( ( StackType_t ) 0x0c )
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/* At the time of writing, the BSP only supports EL3. */
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#define portINITIAL_PSTATE ( portEL3 | portSP_EL0 )
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#endif
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/* Used by portASSERT_IF_INTERRUPT_PRIORITY_INVALID() when ensuring the binary
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* point is zero. */
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#define portBINARY_POINT_BITS ( ( uint8_t ) 0x03 )
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/* Masks all bits in the APSR other than the mode bits. */
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#define portAPSR_MODE_BITS_MASK ( 0x0C )
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/* The I bit in the DAIF bits. */
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#define portDAIF_I ( 0x80 )
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/* Macro to unmask all interrupt priorities. */
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#define portCLEAR_INTERRUPT_MASK() \
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{ \
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portDISABLE_INTERRUPTS(); \
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portICCPMR_PRIORITY_MASK_REGISTER = portUNMASK_VALUE; \
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__asm volatile ( "DSB SY \n" \
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"ISB SY \n" ); \
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portENABLE_INTERRUPTS(); \
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}
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/* Hardware specifics used when sanity checking the configuration. */
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#define portINTERRUPT_PRIORITY_REGISTER_OFFSET 0x400UL
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#define portMAX_8_BIT_VALUE ( ( uint8_t ) 0xff )
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#define portBIT_0_SET ( ( uint8_t ) 0x01 )
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/* The space on the stack required to hold the FPU registers.
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* There are 32 128-bit registers.*/
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#define portFPU_REGISTER_WORDS ( 32 * 2 )
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/*-----------------------------------------------------------*/
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/*
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* Starts the first task executing. This function is necessarily written in
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* assembly code so is implemented in portASM.s.
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*/
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extern void vPortRestoreTaskContext( void );
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/*-----------------------------------------------------------*/
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/* A variable is used to keep track of the critical section nesting. This
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* variable has to be stored as part of the task context and must be initialised to
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* a non zero value to ensure interrupts don't inadvertently become unmasked before
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* the scheduler starts. As it is stored as part of the task context it will
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* automatically be set to 0 when the first task is started. */
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volatile uint64_t ullCriticalNesting = 9999ULL;
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/* Saved as part of the task context. If ullPortTaskHasFPUContext is non-zero
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* then floating point context must be saved and restored for the task. */
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uint64_t ullPortTaskHasFPUContext = pdFALSE;
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/* Set to 1 to pend a context switch from an ISR. */
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uint64_t ullPortYieldRequired = pdFALSE;
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/* Counts the interrupt nesting depth. A context switch is only performed if
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* if the nesting depth is 0. */
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uint64_t ullPortInterruptNesting = 0;
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/* Used in the ASM code. */
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__attribute__( ( used ) ) const uint64_t ullICCEOIR = portICCEOIR_END_OF_INTERRUPT_REGISTER_ADDRESS;
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__attribute__( ( used ) ) const uint64_t ullICCIAR = portICCIAR_INTERRUPT_ACKNOWLEDGE_REGISTER_ADDRESS;
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__attribute__( ( used ) ) const uint64_t ullICCPMR = portICCPMR_PRIORITY_MASK_REGISTER_ADDRESS;
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__attribute__( ( used ) ) const uint64_t ullMaxAPIPriorityMask = ( configMAX_API_CALL_INTERRUPT_PRIORITY << portPRIORITY_SHIFT );
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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,
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TaskFunction_t pxCode,
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void * pvParameters )
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{
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/* Setup the initial stack of the task. The stack is set exactly as
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* expected by the portRESTORE_CONTEXT() macro. */
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/* First all the general purpose registers. */
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pxTopOfStack--;
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*pxTopOfStack = 0x0101010101010101ULL; /* R1 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) pvParameters; /* R0 */
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pxTopOfStack--;
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*pxTopOfStack = 0x0303030303030303ULL; /* R3 */
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pxTopOfStack--;
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*pxTopOfStack = 0x0202020202020202ULL; /* R2 */
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pxTopOfStack--;
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*pxTopOfStack = 0x0505050505050505ULL; /* R5 */
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pxTopOfStack--;
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*pxTopOfStack = 0x0404040404040404ULL; /* R4 */
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pxTopOfStack--;
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*pxTopOfStack = 0x0707070707070707ULL; /* R7 */
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pxTopOfStack--;
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*pxTopOfStack = 0x0606060606060606ULL; /* R6 */
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pxTopOfStack--;
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*pxTopOfStack = 0x0909090909090909ULL; /* R9 */
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pxTopOfStack--;
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*pxTopOfStack = 0x0808080808080808ULL; /* R8 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1111111111111111ULL; /* R11 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1010101010101010ULL; /* R10 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1313131313131313ULL; /* R13 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1212121212121212ULL; /* R12 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1515151515151515ULL; /* R15 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1414141414141414ULL; /* R14 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1717171717171717ULL; /* R17 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1616161616161616ULL; /* R16 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1919191919191919ULL; /* R19 */
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pxTopOfStack--;
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*pxTopOfStack = 0x1818181818181818ULL; /* R18 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2121212121212121ULL; /* R21 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2020202020202020ULL; /* R20 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2323232323232323ULL; /* R23 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2222222222222222ULL; /* R22 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2525252525252525ULL; /* R25 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2424242424242424ULL; /* R24 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2727272727272727ULL; /* R27 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2626262626262626ULL; /* R26 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2929292929292929ULL; /* R29 */
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pxTopOfStack--;
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*pxTopOfStack = 0x2828282828282828ULL; /* R28 */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x00; /* XZR - has no effect, used so there are an even number of registers. */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x00; /* R30 - procedure call link register. */
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pxTopOfStack--;
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*pxTopOfStack = portINITIAL_PSTATE;
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) pxCode; /* Exception return address. */
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#if ( configUSE_TASK_FPU_SUPPORT == 1 )
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{
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/* The task will start with a critical nesting count of 0 as interrupts are
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* enabled. */
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pxTopOfStack--;
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*pxTopOfStack = portNO_CRITICAL_NESTING;
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/* The task will start without a floating point context. A task that
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* uses the floating point hardware must call vPortTaskUsesFPU() before
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* executing any floating point instructions. */
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pxTopOfStack--;
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*pxTopOfStack = portNO_FLOATING_POINT_CONTEXT;
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}
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#elif ( configUSE_TASK_FPU_SUPPORT == 2 )
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{
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/* The task will start with a floating point context. Leave enough
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* space for the registers - and ensure they are initialised to 0. */
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pxTopOfStack -= portFPU_REGISTER_WORDS;
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memset( pxTopOfStack, 0x00, portFPU_REGISTER_WORDS * sizeof( StackType_t ) );
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/* The task will start with a critical nesting count of 0 as interrupts are
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* enabled. */
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pxTopOfStack--;
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*pxTopOfStack = portNO_CRITICAL_NESTING;
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pxTopOfStack--;
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*pxTopOfStack = pdTRUE;
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ullPortTaskHasFPUContext = pdTRUE;
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}
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#else /* if ( configUSE_TASK_FPU_SUPPORT == 1 ) */
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{
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#error "Invalid configUSE_TASK_FPU_SUPPORT setting - configUSE_TASK_FPU_SUPPORT must be set to 1, 2, or left undefined."
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}
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#endif /* if ( configUSE_TASK_FPU_SUPPORT == 1 ) */
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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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uint32_t ulAPSR;
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#if ( configASSERT_DEFINED == 1 )
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{
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volatile uint8_t ucOriginalPriority;
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volatile uint8_t * const pucFirstUserPriorityRegister = ( volatile uint8_t * const ) ( configINTERRUPT_CONTROLLER_BASE_ADDRESS + portINTERRUPT_PRIORITY_REGISTER_OFFSET );
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volatile uint8_t ucMaxPriorityValue;
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/* Determine how many priority bits are implemented in the GIC.
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*
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* Save the interrupt priority value that is about to be clobbered. */
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ucOriginalPriority = *pucFirstUserPriorityRegister;
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/* Determine the number of priority bits available. First write to
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* all possible bits. */
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*pucFirstUserPriorityRegister = portMAX_8_BIT_VALUE;
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/* Read the value back to see how many bits stuck. */
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ucMaxPriorityValue = *pucFirstUserPriorityRegister;
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/* Shift to the least significant bits. */
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while( ( ucMaxPriorityValue & portBIT_0_SET ) != portBIT_0_SET )
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{
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ucMaxPriorityValue >>= ( uint8_t ) 0x01;
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}
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/* Sanity check configUNIQUE_INTERRUPT_PRIORITIES matches the read
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* value. */
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configASSERT( ucMaxPriorityValue >= portLOWEST_INTERRUPT_PRIORITY );
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/* Restore the clobbered interrupt priority register to its original
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* value. */
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*pucFirstUserPriorityRegister = ucOriginalPriority;
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}
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#endif /* configASSERT_DEFINED */
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/* At the time of writing, the BSP only supports EL3. */
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__asm volatile ( "MRS %0, CurrentEL" : "=r" ( ulAPSR ) );
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ulAPSR &= portAPSR_MODE_BITS_MASK;
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#if defined( GUEST )
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#warning "Building for execution as a guest under XEN. THIS IS NOT A FULLY TESTED PATH."
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configASSERT( ulAPSR == portEL1 );
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if( ulAPSR == portEL1 )
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#else
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configASSERT( ulAPSR == portEL3 );
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if( ulAPSR == portEL3 )
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#endif
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{
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/* Only continue if the binary point value is set to its lowest possible
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* setting. See the comments in vPortValidateInterruptPriority() below for
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* more information. */
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configASSERT( ( portICCBPR_BINARY_POINT_REGISTER & portBINARY_POINT_BITS ) <= portMAX_BINARY_POINT_VALUE );
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if( ( portICCBPR_BINARY_POINT_REGISTER & portBINARY_POINT_BITS ) <= portMAX_BINARY_POINT_VALUE )
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{
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/* Interrupts are turned off in the CPU itself to ensure a tick does
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* not execute while the scheduler is being started. Interrupts are
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* automatically turned back on in the CPU when the first task starts
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* executing. */
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portDISABLE_INTERRUPTS();
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/* Start the timer that generates the tick ISR. */
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configSETUP_TICK_INTERRUPT();
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/* Start the first task executing. */
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vPortRestoreTaskContext();
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}
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}
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return 0;
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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 in ports where there is nothing to return to.
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* Artificially force an assert. */
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configASSERT( ullCriticalNesting == 1000ULL );
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}
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/*-----------------------------------------------------------*/
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void vPortEnterCritical( void )
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{
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/* Mask interrupts up to the max syscall interrupt priority. */
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uxPortSetInterruptMask();
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/* Now interrupts are disabled ullCriticalNesting can be accessed
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* directly. Increment ullCriticalNesting to keep a count of how many times
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* portENTER_CRITICAL() has been called. */
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ullCriticalNesting++;
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/* This is not the interrupt safe version of the enter critical function so
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* assert() if it is being called from an interrupt context. Only API
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* functions that end in "FromISR" can be used in an interrupt. Only assert if
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* the critical nesting count is 1 to protect against recursive calls if the
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* assert function also uses a critical section. */
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if( ullCriticalNesting == 1ULL )
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{
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configASSERT( ullPortInterruptNesting == 0 );
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}
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}
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/*-----------------------------------------------------------*/
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void vPortExitCritical( void )
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{
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if( ullCriticalNesting > portNO_CRITICAL_NESTING )
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{
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/* Decrement the nesting count as the critical section is being
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* exited. */
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ullCriticalNesting--;
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/* If the nesting level has reached zero then all interrupt
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* priorities must be re-enabled. */
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if( ullCriticalNesting == portNO_CRITICAL_NESTING )
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{
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/* Critical nesting has reached zero so all interrupt priorities
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* should be unmasked. */
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portCLEAR_INTERRUPT_MASK();
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}
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}
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}
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/*-----------------------------------------------------------*/
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void FreeRTOS_Tick_Handler( void )
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{
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/* Must be the lowest possible priority. */
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#if !defined( QEMU )
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{
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configASSERT( portICCRPR_RUNNING_PRIORITY_REGISTER == ( uint32_t ) ( portLOWEST_USABLE_INTERRUPT_PRIORITY << portPRIORITY_SHIFT ) );
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}
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#endif
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/* Interrupts should not be enabled before this point. */
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#if ( configASSERT_DEFINED == 1 )
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{
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uint32_t ulMaskBits;
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__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). Writting 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 */
|
|
/*-----------------------------------------------------------*/
|