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. */
50 #if __riscv_xlen == 64
51 #define portSTACK_TYPE uint64_t
52 #define portBASE_TYPE int64_t
53 #define portUBASE_TYPE uint64_t
54 #define portMAX_DELAY ( TickType_t ) 0xffffffffffffffffUL
55 #define portPOINTER_SIZE_TYPE uint64_t
56 #elif __riscv_xlen == 32
57 #define portSTACK_TYPE uint32_t
58 #define portBASE_TYPE int32_t
59 #define portUBASE_TYPE uint32_t
60 #define portMAX_DELAY ( TickType_t ) 0xffffffffUL
61 #else /* if __riscv_xlen == 64 */
62 #error "Assembler did not define __riscv_xlen"
63 #endif /* if __riscv_xlen == 64 */
65 typedef portSTACK_TYPE StackType_t;
66 typedef portBASE_TYPE BaseType_t;
67 typedef portUBASE_TYPE UBaseType_t;
68 typedef portUBASE_TYPE TickType_t;
70 /* Legacy type definitions. */
72 #define portFLOAT float
73 #define portDOUBLE double
75 #define portSHORT short
77 /* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
78 * not need to be guarded with a critical section. */
79 #define portTICK_TYPE_IS_ATOMIC 1
80 /*-----------------------------------------------------------*/
82 /* Architecture specifics. */
83 #define portSTACK_GROWTH ( -1 )
84 #define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
86 #define portBYTE_ALIGNMENT 8 /* RV32E uses RISC-V EABI with reduced stack alignment requirements */
88 #define portBYTE_ALIGNMENT 16
90 /*-----------------------------------------------------------*/
92 /* Scheduler utilities. */
93 extern void vTaskSwitchContext( void );
94 #define portYIELD() __asm volatile ( "ecall" );
95 #define portEND_SWITCHING_ISR( xSwitchRequired ) \
98 if( xSwitchRequired != pdFALSE ) \
100 traceISR_EXIT_TO_SCHEDULER(); \
101 vTaskSwitchContext(); \
108 #define portYIELD_FROM_ISR( x ) portEND_SWITCHING_ISR( x )
109 /*-----------------------------------------------------------*/
111 /* Critical section management. */
112 #define portCRITICAL_NESTING_IN_TCB 0
114 #define portDISABLE_INTERRUPTS() __asm volatile ( "csrc mstatus, 8" )
115 #define portENABLE_INTERRUPTS() __asm volatile ( "csrs mstatus, 8" )
117 extern size_t xCriticalNesting;
118 #define portENTER_CRITICAL() \
120 portDISABLE_INTERRUPTS(); \
121 xCriticalNesting++; \
124 #define portEXIT_CRITICAL() \
126 xCriticalNesting--; \
127 if( xCriticalNesting == 0 ) \
129 portENABLE_INTERRUPTS(); \
133 /*-----------------------------------------------------------*/
135 /* Architecture specific optimisations. */
136 #ifndef configUSE_PORT_OPTIMISED_TASK_SELECTION
137 #define configUSE_PORT_OPTIMISED_TASK_SELECTION 1
140 #if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 1 )
142 /* Check the configuration. */
143 #if ( configMAX_PRIORITIES > 32 )
144 #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."
147 /* Store/clear the ready priorities in a bit map. */
148 #define portRECORD_READY_PRIORITY( uxPriority, uxReadyPriorities ) ( uxReadyPriorities ) |= ( 1UL << ( uxPriority ) )
149 #define portRESET_READY_PRIORITY( uxPriority, uxReadyPriorities ) ( uxReadyPriorities ) &= ~( 1UL << ( uxPriority ) )
151 /*-----------------------------------------------------------*/
153 #define portGET_HIGHEST_PRIORITY( uxTopPriority, uxReadyPriorities ) uxTopPriority = ( 31UL - __builtin_clz( uxReadyPriorities ) )
155 #endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
158 /*-----------------------------------------------------------*/
160 /* Task function macros as described on the FreeRTOS.org WEB site. These are
161 * not necessary for to use this port. They are defined so the common demo
162 * files (which build with all the ports) will build. */
163 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void * pvParameters )
164 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void * pvParameters )
166 /*-----------------------------------------------------------*/
168 #define portNOP() __asm volatile ( " nop " )
169 #define portINLINE __inline
171 #ifndef portFORCE_INLINE
172 #define portFORCE_INLINE inline __attribute__( ( always_inline ) )
175 #define portMEMORY_BARRIER() __asm volatile ( "" ::: "memory" )
176 /*-----------------------------------------------------------*/
178 /* configCLINT_BASE_ADDRESS is a legacy definition that was replaced by the
179 * configMTIME_BASE_ADDRESS and configMTIMECMP_BASE_ADDRESS definitions. For
180 * backward compatibility derive the newer definitions from the old if the old
181 * definition is found. */
182 #if defined( configCLINT_BASE_ADDRESS ) && !defined( configMTIME_BASE_ADDRESS ) && ( configCLINT_BASE_ADDRESS == 0 )
184 /* Legacy case where configCLINT_BASE_ADDRESS was defined as 0 to indicate
185 * there was no CLINT. Equivalent now is to set the MTIME and MTIMECMP
187 #define configMTIME_BASE_ADDRESS ( 0 )
188 #define configMTIMECMP_BASE_ADDRESS ( 0 )
189 #elif defined( configCLINT_BASE_ADDRESS ) && !defined( configMTIME_BASE_ADDRESS )
191 /* Legacy case where configCLINT_BASE_ADDRESS was set to the base address of
192 * the CLINT. Equivalent now is to derive the MTIME and MTIMECMP addresses
193 * from the CLINT address. */
194 #define configMTIME_BASE_ADDRESS ( ( configCLINT_BASE_ADDRESS ) + 0xBFF8UL )
195 #define configMTIMECMP_BASE_ADDRESS ( ( configCLINT_BASE_ADDRESS ) + 0x4000UL )
196 #elif !defined( configMTIME_BASE_ADDRESS ) || !defined( configMTIMECMP_BASE_ADDRESS )
197 #error "configMTIME_BASE_ADDRESS and configMTIMECMP_BASE_ADDRESS must be defined in FreeRTOSConfig.h. Set them to zero if there is no MTIME (machine time) clock. See www.FreeRTOS.org/Using-FreeRTOS-on-RISC-V.html"
198 #endif /* if defined( configCLINT_BASE_ADDRESS ) && !defined( configMTIME_BASE_ADDRESS ) && ( configCLINT_BASE_ADDRESS == 0 ) */
206 #endif /* PORTMACRO_H */