2 * FreeRTOS Kernel <DEVELOPMENT BRANCH>
3 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5 * SPDX-License-Identifier: MIT
7 * Permission is hereby granted, free of charge, to any person obtaining a copy of
8 * this software and associated documentation files (the "Software"), to deal in
9 * the Software without restriction, including without limitation the rights to
10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
11 * the Software, and to permit persons to whom the Software is furnished to do so,
12 * subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in all
15 * copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
19 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
20 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
21 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 * https://www.FreeRTOS.org
25 * https://github.com/FreeRTOS
39 /*-----------------------------------------------------------
40 * Port specific definitions.
42 * The settings in this file configure FreeRTOS correctly for the
43 * given hardware and compiler.
45 * These settings should not be altered.
46 *-----------------------------------------------------------
49 /* Type definitions. */
51 #define portFLOAT float
52 #define portDOUBLE double
54 #define portSHORT short
55 #define portSTACK_TYPE uint32_t
56 #define portBASE_TYPE long
58 typedef portSTACK_TYPE StackType_t;
59 typedef long BaseType_t;
60 typedef unsigned long UBaseType_t;
62 #if ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS )
63 typedef uint16_t TickType_t;
64 #define portMAX_DELAY ( TickType_t ) 0xffff
65 #elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_32_BITS )
66 typedef uint32_t TickType_t;
67 #define portMAX_DELAY ( TickType_t ) 0xffffffffUL
69 /* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
70 * not need to be guarded with a critical section. */
71 #define portTICK_TYPE_IS_ATOMIC 1
73 #error configTICK_TYPE_WIDTH_IN_BITS set to unsupported tick type width.
75 /*-----------------------------------------------------------*/
77 /* MPU specific constants. */
78 #define portUSING_MPU_WRAPPERS 1
79 #define portPRIVILEGE_BIT ( 0x80000000UL )
81 #define portMPU_REGION_READ_WRITE ( 0x03UL << 24UL )
82 #define portMPU_REGION_PRIVILEGED_READ_ONLY ( 0x05UL << 24UL )
83 #define portMPU_REGION_READ_ONLY ( 0x06UL << 24UL )
84 #define portMPU_REGION_PRIVILEGED_READ_WRITE ( 0x01UL << 24UL )
85 #define portMPU_REGION_PRIVILEGED_READ_WRITE_UNPRIV_READ_ONLY ( 0x02UL << 24UL )
86 #define portMPU_REGION_CACHEABLE_BUFFERABLE ( 0x07UL << 16UL )
87 #define portMPU_REGION_EXECUTE_NEVER ( 0x01UL << 28UL )
89 #define portGENERAL_PERIPHERALS_REGION ( 3UL )
90 #define portSTACK_REGION ( 4UL )
91 #define portUNPRIVILEGED_FLASH_REGION ( 5UL )
92 #define portPRIVILEGED_FLASH_REGION ( 6UL )
93 #define portPRIVILEGED_RAM_REGION ( 7UL )
94 #define portFIRST_CONFIGURABLE_REGION ( 0UL )
95 #define portLAST_CONFIGURABLE_REGION ( 2UL )
96 #define portNUM_CONFIGURABLE_REGIONS ( ( portLAST_CONFIGURABLE_REGION - portFIRST_CONFIGURABLE_REGION ) + 1 )
97 #define portTOTAL_NUM_REGIONS_IN_TCB ( portNUM_CONFIGURABLE_REGIONS + 1 ) /* Plus one to make space for the stack region. */
99 #define portSWITCH_TO_USER_MODE() __asm volatile ( " mrs r0, control \n orr r0, #1 \n msr control, r0 " ::: "r0", "memory" )
101 typedef struct MPU_REGION_REGISTERS
103 uint32_t ulRegionBaseAddress;
104 uint32_t ulRegionAttribute;
105 } xMPU_REGION_REGISTERS;
107 /* Plus 1 to create space for the stack region. */
108 typedef struct MPU_SETTINGS
110 xMPU_REGION_REGISTERS xRegion[ portTOTAL_NUM_REGIONS_IN_TCB ];
113 /* Architecture specifics. */
114 #define portSTACK_GROWTH ( -1 )
115 #define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
116 #define portBYTE_ALIGNMENT 8
117 #define portDONT_DISCARD __attribute__( ( used ) )
118 /*-----------------------------------------------------------*/
120 /* SVC numbers for various services. */
121 #define portSVC_START_SCHEDULER 0
122 #define portSVC_YIELD 1
123 #define portSVC_RAISE_PRIVILEGE 2
125 /* Scheduler utilities. */
127 #define portYIELD() __asm volatile ( " SVC %0 \n"::"i" ( portSVC_YIELD ) : "memory" )
128 #define portYIELD_WITHIN_API() \
130 /* Set a PendSV to request a context switch. */ \
131 portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT; \
133 /* Barriers are normally not required but do ensure the code is completely \
134 * within the specified behaviour for the architecture. */ \
135 __asm volatile ( "dsb" ::: "memory" ); \
136 __asm volatile ( "isb" ); \
139 #define portNVIC_INT_CTRL_REG ( *( ( volatile uint32_t * ) 0xe000ed04 ) )
140 #define portNVIC_PENDSVSET_BIT ( 1UL << 28UL )
141 #define portEND_SWITCHING_ISR( xSwitchRequired ) do { if( xSwitchRequired ) portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT; } while( 0 )
142 #define portYIELD_FROM_ISR( x ) portEND_SWITCHING_ISR( x )
143 /*-----------------------------------------------------------*/
145 /* Critical section management. */
146 extern void vPortEnterCritical( void );
147 extern void vPortExitCritical( void );
148 #define portSET_INTERRUPT_MASK_FROM_ISR() ulPortRaiseBASEPRI()
149 #define portCLEAR_INTERRUPT_MASK_FROM_ISR( x ) vPortSetBASEPRI( x )
150 #define portDISABLE_INTERRUPTS() vPortRaiseBASEPRI()
151 #define portENABLE_INTERRUPTS() vPortSetBASEPRI( 0 )
152 #define portENTER_CRITICAL() vPortEnterCritical()
153 #define portEXIT_CRITICAL() vPortExitCritical()
155 /*-----------------------------------------------------------*/
157 /* Task function macros as described on the FreeRTOS.org WEB site. These are
158 * not necessary for to use this port. They are defined so the common demo files
159 * (which build with all the ports) will build. */
160 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void * pvParameters )
161 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void * pvParameters )
162 /*-----------------------------------------------------------*/
164 /* Architecture specific optimisations. */
165 #ifndef configUSE_PORT_OPTIMISED_TASK_SELECTION
166 #define configUSE_PORT_OPTIMISED_TASK_SELECTION 1
169 #if configUSE_PORT_OPTIMISED_TASK_SELECTION == 1
171 /* Generic helper function. */
172 __attribute__( ( always_inline ) ) static inline uint8_t ucPortCountLeadingZeros( uint32_t ulBitmap )
176 __asm volatile ( "clz %0, %1" : "=r" ( ucReturn ) : "r" ( ulBitmap ) : "memory" );
181 /* Check the configuration. */
182 #if ( configMAX_PRIORITIES > 32 )
183 #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.
186 /* Store/clear the ready priorities in a bit map. */
187 #define portRECORD_READY_PRIORITY( uxPriority, uxReadyPriorities ) ( uxReadyPriorities ) |= ( 1UL << ( uxPriority ) )
188 #define portRESET_READY_PRIORITY( uxPriority, uxReadyPriorities ) ( uxReadyPriorities ) &= ~( 1UL << ( uxPriority ) )
190 /*-----------------------------------------------------------*/
192 #define portGET_HIGHEST_PRIORITY( uxTopPriority, uxReadyPriorities ) uxTopPriority = ( 31UL - ( uint32_t ) ucPortCountLeadingZeros( ( uxReadyPriorities ) ) )
194 #endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
196 /*-----------------------------------------------------------*/
199 void vPortValidateInterruptPriority( void );
200 #define portASSERT_IF_INTERRUPT_PRIORITY_INVALID() vPortValidateInterruptPriority()
203 /* portNOP() is not required by this port. */
206 #define portINLINE __inline
208 #ifndef portFORCE_INLINE
209 #define portFORCE_INLINE inline __attribute__( ( always_inline ) )
211 /*-----------------------------------------------------------*/
213 extern BaseType_t xIsPrivileged( void );
214 extern void vResetPrivilege( void );
217 * @brief Checks whether or not the processor is privileged.
219 * @return 1 if the processor is already privileged, 0 otherwise.
221 #define portIS_PRIVILEGED() xIsPrivileged()
224 * @brief Raise an SVC request to raise privilege.
226 #define portRAISE_PRIVILEGE() __asm volatile ( "svc %0 \n" ::"i" ( portSVC_RAISE_PRIVILEGE ) : "memory" );
229 * @brief Lowers the privilege level by setting the bit 0 of the CONTROL
232 #define portRESET_PRIVILEGE() vResetPrivilege()
233 /*-----------------------------------------------------------*/
235 portFORCE_INLINE static BaseType_t xPortIsInsideInterrupt( void )
237 uint32_t ulCurrentInterrupt;
240 /* Obtain the number of the currently executing interrupt. */
241 __asm volatile ( "mrs %0, ipsr" : "=r" ( ulCurrentInterrupt )::"memory" );
243 if( ulCurrentInterrupt == 0 )
255 /*-----------------------------------------------------------*/
257 portFORCE_INLINE static void vPortRaiseBASEPRI( void )
259 uint32_t ulNewBASEPRI;
264 " msr basepri, %0 \n"\
267 : "=r" ( ulNewBASEPRI ) : "i" ( configMAX_SYSCALL_INTERRUPT_PRIORITY ) : "memory"
271 /*-----------------------------------------------------------*/
273 portFORCE_INLINE static uint32_t ulPortRaiseBASEPRI( void )
275 uint32_t ulOriginalBASEPRI, ulNewBASEPRI;
279 " mrs %0, basepri \n"\
281 " msr basepri, %1 \n"\
284 : "=r" ( ulOriginalBASEPRI ), "=r" ( ulNewBASEPRI ) : "i" ( configMAX_SYSCALL_INTERRUPT_PRIORITY ) : "memory"
287 /* This return will not be reached but is necessary to prevent compiler
289 return ulOriginalBASEPRI;
291 /*-----------------------------------------------------------*/
293 portFORCE_INLINE static void vPortSetBASEPRI( uint32_t ulNewMaskValue )
297 " msr basepri, %0 "::"r" ( ulNewMaskValue ) : "memory"
300 /*-----------------------------------------------------------*/
302 #define portMEMORY_BARRIER() __asm volatile ( "" ::: "memory" )
304 #ifndef configENFORCE_SYSTEM_CALLS_FROM_KERNEL_ONLY
305 #warning "configENFORCE_SYSTEM_CALLS_FROM_KERNEL_ONLY is not defined. We recommend defining it to 1 in FreeRTOSConfig.h for better security. *www.FreeRTOS.org/FreeRTOS-V10.3.x.html"
306 #define configENFORCE_SYSTEM_CALLS_FROM_KERNEL_ONLY 0
308 /*-----------------------------------------------------------*/
316 #endif /* PORTMACRO_H */