2 * FreeRTOS Kernel V10.1.0
\r
3 * Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
\r
5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
\r
6 * this software and associated documentation files (the "Software"), to deal in
\r
7 * the Software without restriction, including without limitation the rights to
\r
8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
\r
9 * the Software, and to permit persons to whom the Software is furnished to do so,
\r
10 * subject to the following conditions:
\r
12 * The above copyright notice and this permission notice shall be included in all
\r
13 * copies or substantial portions of the Software.
\r
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
\r
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
\r
17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
\r
18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
\r
19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
\r
20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\r
22 * http://www.FreeRTOS.org
\r
23 * http://aws.amazon.com/freertos
\r
25 * 1 tab == 4 spaces!
\r
28 /*-----------------------------------------------------------
\r
29 * Implementation of functions defined in portable.h for the SH2A port.
\r
30 *----------------------------------------------------------*/
\r
32 /* Scheduler includes. */
\r
33 #include "FreeRTOS.h"
\r
36 /* Library includes. */
\r
39 /* Hardware specifics. */
\r
40 #include <iorx62n.h>
\r
42 /*-----------------------------------------------------------*/
\r
44 /* Tasks should start with interrupts enabled and in Supervisor mode, therefore
\r
45 PSW is set with U and I set, and PM and IPL clear. */
\r
46 #define portINITIAL_PSW ( ( StackType_t ) 0x00030000 )
\r
47 #define portINITIAL_FPSW ( ( StackType_t ) 0x00000100 )
\r
49 /*-----------------------------------------------------------*/
\r
52 * Function to start the first task executing - written in asm code as direct
\r
53 * access to registers is required.
\r
55 extern void prvStartFirstTask( void );
\r
58 * The tick ISR handler. The peripheral used is configured by the application
\r
59 * via a hook/callback function.
\r
61 __interrupt void vTickISR( void );
\r
63 /*-----------------------------------------------------------*/
\r
65 extern void *pxCurrentTCB;
\r
67 /*-----------------------------------------------------------*/
\r
70 * See header file for description.
\r
72 StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
\r
74 /* R0 is not included as it is the stack pointer. */
\r
76 *pxTopOfStack = 0x00;
\r
78 *pxTopOfStack = portINITIAL_PSW;
\r
80 *pxTopOfStack = ( StackType_t ) pxCode;
\r
82 /* When debugging it can be useful if every register is set to a known
\r
83 value. Otherwise code space can be saved by just setting the registers
\r
84 that need to be set. */
\r
85 #ifdef USE_FULL_REGISTER_INITIALISATION
\r
88 *pxTopOfStack = 0xffffffff; /* r15. */
\r
90 *pxTopOfStack = 0xeeeeeeee;
\r
92 *pxTopOfStack = 0xdddddddd;
\r
94 *pxTopOfStack = 0xcccccccc;
\r
96 *pxTopOfStack = 0xbbbbbbbb;
\r
98 *pxTopOfStack = 0xaaaaaaaa;
\r
100 *pxTopOfStack = 0x99999999;
\r
102 *pxTopOfStack = 0x88888888;
\r
104 *pxTopOfStack = 0x77777777;
\r
106 *pxTopOfStack = 0x66666666;
\r
108 *pxTopOfStack = 0x55555555;
\r
110 *pxTopOfStack = 0x44444444;
\r
112 *pxTopOfStack = 0x33333333;
\r
114 *pxTopOfStack = 0x22222222;
\r
119 pxTopOfStack -= 15;
\r
123 *pxTopOfStack = ( StackType_t ) pvParameters; /* R1 */
\r
125 *pxTopOfStack = portINITIAL_FPSW;
\r
127 *pxTopOfStack = 0x12345678; /* Accumulator. */
\r
129 *pxTopOfStack = 0x87654321; /* Accumulator. */
\r
131 return pxTopOfStack;
\r
133 /*-----------------------------------------------------------*/
\r
135 BaseType_t xPortStartScheduler( void )
\r
137 extern void vApplicationSetupTimerInterrupt( void );
\r
139 /* Use pxCurrentTCB just so it does not get optimised away. */
\r
140 if( pxCurrentTCB != NULL )
\r
142 /* Call an application function to set up the timer that will generate the
\r
143 tick interrupt. This way the application can decide which peripheral to
\r
144 use. A demo application is provided to show a suitable example. */
\r
145 vApplicationSetupTimerInterrupt();
\r
147 /* Enable the software interrupt. */
\r
148 _IEN( _ICU_SWINT ) = 1;
\r
150 /* Ensure the software interrupt is clear. */
\r
151 _IR( _ICU_SWINT ) = 0;
\r
153 /* Ensure the software interrupt is set to the kernel priority. */
\r
154 _IPR( _ICU_SWINT ) = configKERNEL_INTERRUPT_PRIORITY;
\r
156 /* Start the first task. */
\r
157 prvStartFirstTask();
\r
160 /* Should not get here. */
\r
163 /*-----------------------------------------------------------*/
\r
165 #pragma vector = configTICK_VECTOR
\r
166 __interrupt void vTickISR( void )
\r
168 /* Re-enable interrupts. */
\r
169 __enable_interrupt();
\r
171 /* Increment the tick, and perform any processing the new tick value
\r
173 __set_interrupt_level( configMAX_SYSCALL_INTERRUPT_PRIORITY );
\r
175 if( xTaskIncrementTick() != pdFALSE )
\r
180 __set_interrupt_level( configKERNEL_INTERRUPT_PRIORITY );
\r
182 /*-----------------------------------------------------------*/
\r
184 void vPortEndScheduler( void )
\r
186 /* Not implemented in ports where there is nothing to return to.
\r
187 Artificially force an assert. */
\r
188 configASSERT( pxCurrentTCB == NULL );
\r
190 /*-----------------------------------------------------------*/
\r