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
37 /*-----------------------------------------------------------
38 * Port specific definitions.
40 * The settings in this file configure FreeRTOS correctly for the
41 * given hardware and compiler.
43 * These settings should not be altered.
44 *-----------------------------------------------------------
47 /* Type definitions. */
49 #define portFLOAT float
50 #define portDOUBLE double
52 #define portSHORT short
53 #define portSTACK_TYPE uint8_t
54 #define portBASE_TYPE char
56 typedef portSTACK_TYPE StackType_t;
57 typedef signed char BaseType_t;
58 typedef unsigned char UBaseType_t;
61 #if( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS )
62 typedef uint16_t TickType_t;
63 #define portMAX_DELAY ( TickType_t ) 0xffff
64 #elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_32_BITS )
65 typedef uint32_t TickType_t;
66 #define portMAX_DELAY ( TickType_t ) ( 0xFFFFFFFF )
68 #error configTICK_TYPE_WIDTH_IN_BITS set to unsupported tick type width.
70 /*-----------------------------------------------------------*/
72 /* Hardware specifics. */
73 #define portBYTE_ALIGNMENT 1
74 #define portSTACK_GROWTH ( -1 )
75 #define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
76 #define portYIELD() __asm( "swi" );
77 /*-----------------------------------------------------------*/
79 /* Critical section handling. */
80 #define portENABLE_INTERRUPTS() __asm( "cli" )
81 #define portDISABLE_INTERRUPTS() __asm( "sei" )
84 * Disable interrupts before incrementing the count of critical section nesting.
85 * The nesting count is maintained so we know when interrupts should be
86 * re-enabled. Once interrupts are disabled the nesting count can be accessed
87 * directly. Each task maintains its own nesting count.
89 #define portENTER_CRITICAL() \
91 extern volatile UBaseType_t uxCriticalNesting; \
93 portDISABLE_INTERRUPTS(); \
94 uxCriticalNesting++; \
98 * Interrupts are disabled so we can access the nesting count directly. If the
99 * nesting is found to be 0 (no nesting) then we are leaving the critical
100 * section and interrupts can be re-enabled.
102 #define portEXIT_CRITICAL() \
104 extern volatile UBaseType_t uxCriticalNesting; \
106 uxCriticalNesting--; \
107 if( uxCriticalNesting == 0 ) \
109 portENABLE_INTERRUPTS(); \
112 /*-----------------------------------------------------------*/
114 /* Task utilities. */
117 * These macros are very simple as the processor automatically saves and
118 * restores its registers as interrupts are entered and exited. In
119 * addition to the (automatically stacked) registers we also stack the
120 * critical nesting count. Each task maintains its own critical nesting
121 * count as it is legitimate for a task to yield from within a critical
122 * section. If the banked memory model is being used then the PPAGE
123 * register is also stored as part of the tasks context.
128 * Load the stack pointer for the task, then pull the critical nesting
129 * count and PPAGE register from the stack. The remains of the
130 * context are restored by the RTI instruction.
132 #define portRESTORE_CONTEXT() \
135 .globl pxCurrentTCB ; void * \n\
136 .globl uxCriticalNesting ; char \n\
141 movb 1,sp+,uxCriticalNesting \n\
142 movb 1,sp+,0x30 ; PPAGE \n\
147 * By the time this macro is called the processor has already stacked the
148 * registers. Simply stack the nesting count and PPAGE value, then save
149 * the task stack pointer.
151 #define portSAVE_CONTEXT() \
154 .globl pxCurrentTCB ; void * \n\
155 .globl uxCriticalNesting ; char \n\
157 movb 0x30, 1,-sp ; PPAGE \n\
158 movb uxCriticalNesting, 1,-sp \n\
167 * These macros are as per the BANKED versions above, but without saving
168 * and restoring the PPAGE register.
171 #define portRESTORE_CONTEXT() \
174 .globl pxCurrentTCB ; void * \n\
175 .globl uxCriticalNesting ; char \n\
180 movb 1,sp+,uxCriticalNesting \n\
184 #define portSAVE_CONTEXT() \
187 .globl pxCurrentTCB ; void * \n\
188 .globl uxCriticalNesting ; char \n\
190 movb uxCriticalNesting, 1,-sp \n\
199 * Utility macros to save/restore correct software registers for GCC. This is
200 * useful when GCC does not generate appropriate ISR head/tail code.
202 #define portISR_HEAD() \
205 movw _.frame, 2,-sp \n\
206 movw _.tmp, 2,-sp \n\
209 ;movw _.d2, 2,-sp \n\
210 ;movw _.d1, 2,-sp \n\
214 #define portISR_TAIL() \
219 movw 2,sp+, _.tmp \n\
220 movw 2,sp+, _.frame \n\
221 ;movw 2,sp+, _.d1 \n\
222 ;movw 2,sp+, _.d2 \n\
228 * Utility macro to call macros above in correct order in order to perform a
229 * task switch from within a standard ISR. This macro can only be used if
230 * the ISR does not use any local (stack) variables. If the ISR uses stack
231 * variables portYIELD() should be used in it's place.
234 #define portTASK_SWITCH_FROM_ISR() \
235 portSAVE_CONTEXT(); \
236 vTaskSwitchContext(); \
237 portRESTORE_CONTEXT();
240 /* Task function macros as described on the FreeRTOS.org WEB site. */
241 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
242 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
248 #endif /* PORTMACRO_H */