xref: /Kernel-v10.6.2/portable/ThirdParty/CDK/T-HEAD_CK802/port.c (revision 3a413d1022a4ff60ffc9631877992ac08affcc21) 
1 /*
2  * Copyright (C) 2017 C-SKY Microsystems Co., Ltd. All rights reserved.
3  *
4  * SPDX-License-Identifier: MIT
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy of
7  * this software and associated documentation files (the "Software"), to deal in
8  * the Software without restriction, including without limitation the rights to
9  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
10  * the Software, and to permit persons to whom the Software is furnished to do so,
11  * subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in all
14  * copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
18  * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
19  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
20  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22  *
23  */
24 
25 /* Kernel includes. */
26 #include "FreeRTOS.h"
27 #include "task.h"
28 
29 extern void vPortStartTask(void);
30 
31 /* Used to keep track of the number of nested calls to taskENTER_CRITICAL().  This
32 will be set to 0 prior to the first task being started. */
33 portLONG ulCriticalNesting = 0x9999UL;
34 
35 /* Used to record one tack want to swtich task after enter critical area, we need know it
36  * and implement task switch after exit critical area */
37 portLONG pendsvflag = 0;
38 
pxPortInitialiseStack(StackType_t * pxTopOfStack,TaskFunction_t pxCode,void * pvParameters)39 StackType_t *pxPortInitialiseStack( StackType_t * pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
40 {
41     StackType_t *stk  = NULL;
42 
43     stk = pxTopOfStack;
44 
45     *(--stk)  = (uint32_t)pxCode;            /* Entry Point                                         */
46     *(--stk)  = (uint32_t)0xE0000140L;       /* PSR                                                 */
47     *(--stk)  = (uint32_t)0xFFFFFFFEL;       /* R15 (LR) (init value will cause fault if ever used) */
48     *(--stk)  = (uint32_t)0x13131313L;       /* R13                                                 */
49     *(--stk)  = (uint32_t)0x12121212L;       /* R12                                                 */
50     *(--stk)  = (uint32_t)0x11111111L;       /* R11                                                 */
51     *(--stk)  = (uint32_t)0x10101010L;       /* R10                                                 */
52     *(--stk)  = (uint32_t)0x09090909L;       /* R9                                                  */
53     *(--stk)  = (uint32_t)0x08080808L;       /* R8                                                  */
54     *(--stk)  = (uint32_t)0x07070707L;       /* R7                                                  */
55     *(--stk)  = (uint32_t)0x06060606L;       /* R6                                                  */
56     *(--stk)  = (uint32_t)0x05050505L;       /* R5                                                  */
57     *(--stk)  = (uint32_t)0x04040404L;       /* R4                                                  */
58     *(--stk)  = (uint32_t)0x03030303L;       /* R3                                                  */
59     *(--stk)  = (uint32_t)0x02020202L;       /* R2                                                  */
60     *(--stk)  = (uint32_t)0x01010101L;       /* R1                                                  */
61     *(--stk)  = (uint32_t)pvParameters;      /* R0 : argument                                       */
62 
63     return stk;
64 }
65 
xPortStartScheduler(void)66 BaseType_t xPortStartScheduler( void )
67 {
68     ulCriticalNesting = 0UL;
69 
70     vPortStartTask();
71 
72     return pdFALSE;
73 }
74 
75 
vPortEndScheduler(void)76 void vPortEndScheduler( void )
77 {
78     /* Not implemented as there is nothing to return to. */
79 }
80 
vPortEnterCritical(void)81 void vPortEnterCritical( void )
82 {
83     portDISABLE_INTERRUPTS();
84     ulCriticalNesting ++;
85 }
86 
vPortExitCritical(void)87 void vPortExitCritical( void )
88 {
89     if (ulCriticalNesting == 0) {
90         while(1);
91     }
92 
93     ulCriticalNesting --;
94     if (ulCriticalNesting == 0)
95     {
96         portENABLE_INTERRUPTS();
97 
98         if (pendsvflag)
99         {
100             pendsvflag = 0;
101             portYIELD();
102         }
103     }
104 }
105 
106 #if configUSE_PREEMPTION == 0
xPortSysTickHandler(void)107 void xPortSysTickHandler( void )
108 {
109     portLONG ulDummy;
110 
111     ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();
112     xTaskIncrementTick();
113     portCLEAR_INTERRUPT_MASK_FROM_ISR( ulDummy );
114 }
115 
116 #else
xPortSysTickHandler(void)117 void xPortSysTickHandler( void )
118 {
119     portLONG ulDummy;
120 
121     ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();
122     {
123         if (xTaskIncrementTick() != pdFALSE)
124         {
125             portYIELD_FROM_ISR(pdTRUE);
126         }
127     }
128     portCLEAR_INTERRUPT_MASK_FROM_ISR( ulDummy );
129 }
130 #endif
131 
vPortYieldHandler(void)132 void vPortYieldHandler( void )
133 {
134     uint32_t ulSavedInterruptMask;
135 
136     ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();
137 
138     vTaskSwitchContext();
139 
140     portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );
141 }
142 
vApplicationStackOverflowHook(xTaskHandle * pxTask,signed portCHAR * pcTaskName)143 __attribute__((weak)) void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed portCHAR *pcTaskName )
144 {
145     for(;;);
146 }
147 
vApplicationMallocFailedHook(void)148 __attribute__((weak)) void vApplicationMallocFailedHook( void )
149 {
150     for(;;);
151 }
152