2 * FreeRTOS Kernel V11.2.0
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
33 #include "intrinsics.h"
41 /*-----------------------------------------------------------
42 * Port specific definitions.
44 * The settings in this file configure FreeRTOS correctly for the
45 * given hardware and compiler.
47 * These settings should not be altered.
48 *-----------------------------------------------------------
51 /* Type definitions. */
52 #if __riscv_xlen == 64
53 #define portSTACK_TYPE uint64_t
54 #define portBASE_TYPE int64_t
55 #define portUBASE_TYPE uint64_t
56 #define portMAX_DELAY ( TickType_t ) 0xffffffffffffffffUL
57 #define portPOINTER_SIZE_TYPE uint64_t
58 #elif __riscv_xlen == 32
59 #define portSTACK_TYPE uint32_t
60 #define portBASE_TYPE int32_t
61 #define portUBASE_TYPE uint32_t
62 #define portMAX_DELAY ( TickType_t ) 0xffffffffUL
63 #else /* if __riscv_xlen == 64 */
64 #error "Assembler did not define __riscv_xlen"
65 #endif /* if __riscv_xlen == 64 */
67 typedef portSTACK_TYPE StackType_t;
68 typedef portBASE_TYPE BaseType_t;
69 typedef portUBASE_TYPE UBaseType_t;
70 typedef portUBASE_TYPE TickType_t;
72 /* Legacy type definitions. */
74 #define portFLOAT float
75 #define portDOUBLE double
77 #define portSHORT short
79 /* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
80 * not need to be guarded with a critical section. */
81 #define portTICK_TYPE_IS_ATOMIC 1
82 /*-----------------------------------------------------------*/
84 /* Architecture specifics. */
85 #define portSTACK_GROWTH ( -1 )
86 #define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
88 #define portBYTE_ALIGNMENT 8 /* RV32E uses RISC-V EABI with reduced stack alignment requirements. */
90 #define portBYTE_ALIGNMENT 16
92 /*-----------------------------------------------------------*/
94 /* Scheduler utilities. */
95 extern void vTaskSwitchContext( void );
96 #define portYIELD() __asm volatile ( "ecall" );
97 #define portEND_SWITCHING_ISR( xSwitchRequired ) \
100 if( xSwitchRequired != pdFALSE ) \
102 traceISR_EXIT_TO_SCHEDULER(); \
103 vTaskSwitchContext(); \
110 #define portYIELD_FROM_ISR( x ) portEND_SWITCHING_ISR( x )
111 /*-----------------------------------------------------------*/
113 /* Critical section management. */
114 #define portCRITICAL_NESTING_IN_TCB 0
116 #define portDISABLE_INTERRUPTS() __disable_interrupt()
117 #define portENABLE_INTERRUPTS() __enable_interrupt()
119 extern size_t xCriticalNesting;
120 #define portENTER_CRITICAL() \
122 portDISABLE_INTERRUPTS(); \
123 xCriticalNesting++; \
126 #define portEXIT_CRITICAL() \
128 xCriticalNesting--; \
129 if( xCriticalNesting == 0 ) \
131 portENABLE_INTERRUPTS(); \
135 /*-----------------------------------------------------------*/
137 /* Architecture specific optimisations. */
138 #if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 1 )
140 #error "configUSE_PORT_OPTIMISED_TASK_SELECTION cannot yet be used in the IAR RISC-V port, the CLZ instruction needs to be emulated."
142 #endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
145 /*-----------------------------------------------------------*/
147 /* Task function macros as described on the FreeRTOS.org WEB site. These are
148 * not necessary for to use this port. They are defined so the common demo
149 * files (which build with all the ports) will build. */
150 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void * pvParameters )
151 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void * pvParameters )
153 /*-----------------------------------------------------------*/
155 #define portNOP() __asm volatile ( " nop " )
156 #define portINLINE __inline
158 #ifndef portFORCE_INLINE
159 #define portFORCE_INLINE inline __attribute__( ( always_inline ) )
162 #define portMEMORY_BARRIER() __asm volatile ( "" ::: "memory" )
163 /*-----------------------------------------------------------*/
165 /* Suppress warnings that are generated by the IAR tools, but cannot be fixed in
166 * the source code because to do so would cause other compilers to generate
168 #pragma diag_suppress=Pa082
170 /* configCLINT_BASE_ADDRESS is a legacy definition that was replaced by the
171 * configMTIME_BASE_ADDRESS and configMTIMECMP_BASE_ADDRESS definitions. For
172 * backward compatibility derive the newer definitions from the old if the old
173 * definition is found. */
174 #if defined( configCLINT_BASE_ADDRESS ) && !defined( configMTIME_BASE_ADDRESS ) && ( configCLINT_BASE_ADDRESS == 0 )
176 /* Legacy case where configCLINT_BASE_ADDRESS was defined as 0 to indicate
177 * there was no CLINT. Equivalent now is to set the MTIME and MTIMECMP
179 #define configMTIME_BASE_ADDRESS ( 0 )
180 #define configMTIMECMP_BASE_ADDRESS ( 0 )
181 #elif defined( configCLINT_BASE_ADDRESS ) && !defined( configMTIME_BASE_ADDRESS )
183 /* Legacy case where configCLINT_BASE_ADDRESS was set to the base address of
184 * the CLINT. Equivalent now is to derive the MTIME and MTIMECMP addresses
185 * from the CLINT address. */
186 #define configMTIME_BASE_ADDRESS ( ( configCLINT_BASE_ADDRESS ) + 0xBFF8UL )
187 #define configMTIMECMP_BASE_ADDRESS ( ( configCLINT_BASE_ADDRESS ) + 0x4000UL )
188 #elif !defined( configMTIME_BASE_ADDRESS ) || !defined( configMTIMECMP_BASE_ADDRESS )
189 #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"
190 #endif /* if defined( configCLINT_BASE_ADDRESS ) && !defined( configMTIME_BASE_ADDRESS ) && ( configCLINT_BASE_ADDRESS == 0 ) */
198 #endif /* PORTMACRO_H */