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 uint8_t
56 #define portBASE_TYPE char
58 typedef portSTACK_TYPE StackType_t;
59 typedef signed char BaseType_t;
60 typedef unsigned char UBaseType_t;
63 #if ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS )
64 typedef uint16_t TickType_t;
65 #define portMAX_DELAY ( TickType_t ) 0xffff
66 #elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_32_BITS )
67 typedef uint32_t TickType_t;
68 #define portMAX_DELAY ( TickType_t ) ( 0xFFFFFFFFUL )
70 #error configTICK_TYPE_WIDTH_IN_BITS set to unsupported tick type width.
72 /*-----------------------------------------------------------*/
74 /* Hardware specifics. */
75 #define portBYTE_ALIGNMENT 1
76 #define portSTACK_GROWTH ( -1 )
77 #define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
78 #define portYIELD() __asm( "swi" );
79 /*-----------------------------------------------------------*/
81 /* Critical section handling. */
82 #define portENABLE_INTERRUPTS() __asm( "cli" )
83 #define portDISABLE_INTERRUPTS() __asm( "sei" )
86 * Disable interrupts before incrementing the count of critical section nesting.
87 * The nesting count is maintained so we know when interrupts should be
88 * re-enabled. Once interrupts are disabled the nesting count can be accessed
89 * directly. Each task maintains its own nesting count.
91 #define portENTER_CRITICAL() \
93 extern volatile UBaseType_t uxCriticalNesting; \
95 portDISABLE_INTERRUPTS(); \
96 uxCriticalNesting++; \
100 * Interrupts are disabled so we can access the nesting count directly. If the
101 * nesting is found to be 0 (no nesting) then we are leaving the critical
102 * section and interrupts can be re-enabled.
104 #define portEXIT_CRITICAL() \
106 extern volatile UBaseType_t uxCriticalNesting; \
108 uxCriticalNesting--; \
109 if( uxCriticalNesting == 0 ) \
111 portENABLE_INTERRUPTS(); \
114 /*-----------------------------------------------------------*/
116 /* Task utilities. */
119 * These macros are very simple as the processor automatically saves and
120 * restores its registers as interrupts are entered and exited. In
121 * addition to the (automatically stacked) registers we also stack the
122 * critical nesting count. Each task maintains its own critical nesting
123 * count as it is legitimate for a task to yield from within a critical
124 * section. If the banked memory model is being used then the PPAGE
125 * register is also stored as part of the tasks context.
131 * Load the stack pointer for the task, then pull the critical nesting
132 * count and PPAGE register from the stack. The remains of the
133 * context are restored by the RTI instruction.
135 #define portRESTORE_CONTEXT() \
138 .globl pxCurrentTCB ; void * \n\
139 .globl uxCriticalNesting ; char \n\
144 movb 1,sp+,uxCriticalNesting \n\
145 movb 1,sp+,0x30 ; PPAGE \n\
150 * By the time this macro is called the processor has already stacked the
151 * registers. Simply stack the nesting count and PPAGE value, then save
152 * the task stack pointer.
154 #define portSAVE_CONTEXT() \
157 .globl pxCurrentTCB ; void * \n\
158 .globl uxCriticalNesting ; char \n\
160 movb 0x30, 1,-sp ; PPAGE \n\
161 movb uxCriticalNesting, 1,-sp \n\
167 #else /* ifdef BANKED_MODEL */
170 * These macros are as per the BANKED versions above, but without saving
171 * and restoring the PPAGE register.
174 #define portRESTORE_CONTEXT() \
177 .globl pxCurrentTCB ; void * \n\
178 .globl uxCriticalNesting ; char \n\
183 movb 1,sp+,uxCriticalNesting \n\
187 #define portSAVE_CONTEXT() \
190 .globl pxCurrentTCB ; void * \n\
191 .globl uxCriticalNesting ; char \n\
193 movb uxCriticalNesting, 1,-sp \n\
199 #endif /* ifdef BANKED_MODEL */
202 * Utility macros to save/restore correct software registers for GCC. This is
203 * useful when GCC does not generate appropriate ISR head/tail code.
205 #define portISR_HEAD() \
208 movw _.frame, 2,-sp \n\
209 movw _.tmp, 2,-sp \n\
212 ;movw _.d2, 2,-sp \n\
213 ;movw _.d1, 2,-sp \n\
217 #define portISR_TAIL() \
222 movw 2,sp+, _.tmp \n\
223 movw 2,sp+, _.frame \n\
224 ;movw 2,sp+, _.d1 \n\
225 ;movw 2,sp+, _.d2 \n\
231 * Utility macro to call macros above in correct order in order to perform a
232 * task switch from within a standard ISR. This macro can only be used if
233 * the ISR does not use any local (stack) variables. If the ISR uses stack
234 * variables portYIELD() should be used in it's place.
237 #define portTASK_SWITCH_FROM_ISR() \
238 portSAVE_CONTEXT(); \
239 vTaskSwitchContext(); \
240 portRESTORE_CONTEXT();
243 /* Task function macros as described on the FreeRTOS.org WEB site. */
244 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void * pvParameters )
245 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void * pvParameters )
253 #endif /* PORTMACRO_H */