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1 /*\r
2     FreeRTOS V6.0.1 - Copyright (C) 2009 Real Time Engineers Ltd.\r
3 \r
4     ***************************************************************************\r
5     *                                                                         *\r
6     * If you are:                                                             *\r
7     *                                                                         *\r
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10     *    + Looking for basic training,                                        *\r
11     *    + Wanting to improve your FreeRTOS skills and productivity           *\r
12     *                                                                         *\r
13     * then take a look at the FreeRTOS eBook                                  *\r
14     *                                                                         *\r
15     *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *\r
16     *                  http://www.FreeRTOS.org/Documentation                  *\r
17     *                                                                         *\r
18     * A pdf reference manual is also available.  Both are usually delivered   *\r
19     * to your inbox within 20 minutes to two hours when purchased between 8am *\r
20     * and 8pm GMT (although please allow up to 24 hours in case of            *\r
21     * exceptional circumstances).  Thank you for your support!                *\r
22     *                                                                         *\r
23     ***************************************************************************\r
24 \r
25     This file is part of the FreeRTOS distribution.\r
26 \r
27     FreeRTOS is free software; you can redistribute it and/or modify it under\r
28     the terms of the GNU General Public License (version 2) as published by the\r
29     Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
30     ***NOTE*** The exception to the GPL is included to allow you to distribute\r
31     a combined work that includes FreeRTOS without being obliged to provide the\r
32     source code for proprietary components outside of the FreeRTOS kernel.\r
33     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT\r
34     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or\r
35     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for\r
36     more details. You should have received a copy of the GNU General Public \r
37     License and the FreeRTOS license exception along with FreeRTOS; if not it \r
38     can be viewed here: http://www.freertos.org/a00114.html and also obtained \r
39     by writing to Richard Barry, contact details for whom are available on the\r
40     FreeRTOS WEB site.\r
41 \r
42     1 tab == 4 spaces!\r
43 \r
44     http://www.FreeRTOS.org - Documentation, latest information, license and\r
45     contact details.\r
46 \r
47     http://www.SafeRTOS.com - A version that is certified for use in safety\r
48     critical systems.\r
49 \r
50     http://www.OpenRTOS.com - Commercial support, development, porting,\r
51     licensing and training services.\r
52 */\r
53 \r
54 /*-----------------------------------------------------------\r
55  * Implementation of functions defined in portable.h for the SH2A port.\r
56  *----------------------------------------------------------*/\r
57 \r
58 /* Scheduler includes. */\r
59 #include "FreeRTOS.h"\r
60 #include "task.h"\r
61 \r
62 #define portINITIAL_SR          0UL /* No interrupts masked. */\r
63 \r
64 \r
65 /*-----------------------------------------------------------*/\r
66 \r
67 /*\r
68  * Setup a peripheral timer to generate the RTOS tick interrupt.\r
69  */\r
70 static void prvSetupTimerInterrupt( void );\r
71 \r
72 /*\r
73  * The TRAPA handler used to force a context switch.\r
74  */\r
75 void vPortYield( void );\r
76 \r
77 /*\r
78  * Function to start the first task executing - defined in portasm.src.\r
79  */\r
80 extern void vPortStartFirstTask( void );\r
81 \r
82 /*\r
83  * Obtains the current GBR value - defined in portasm.src.\r
84  */\r
85 extern unsigned long ulPortGetGBR( void );\r
86 \r
87 /*-----------------------------------------------------------*/\r
88 \r
89 /* \r
90  * See header file for description. \r
91  */\r
92 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )\r
93 {\r
94 *pxTopOfStack = 0x11111111UL;\r
95 pxTopOfStack--;\r
96 *pxTopOfStack = 0x22222222UL;\r
97 pxTopOfStack--;\r
98 *pxTopOfStack = 0x33333333UL;\r
99 pxTopOfStack--;\r
100 \r
101         /* SR. */\r
102         *pxTopOfStack = portINITIAL_SR; \r
103         pxTopOfStack--;\r
104         \r
105         /* PC then MACL, MACH. */\r
106 //      *pxTopOfStack = ( unsigned long ) pxCode;\r
107 //      pxTopOfStack -= 3;\r
108 *pxTopOfStack = ( unsigned long ) pxCode;\r
109 pxTopOfStack--;\r
110 *pxTopOfStack = 0xffffUL;\r
111 pxTopOfStack--;\r
112 *pxTopOfStack = 0xeeeeUL;\r
113 pxTopOfStack--;\r
114         \r
115         /* GBR then PR, R14-R5. */\r
116 //      *pxTopOfStack = ulPortGetGBR();\r
117 //      pxTopOfStack -= 12;\r
118 *pxTopOfStack = 0x00UL;\r
119 pxTopOfStack--;\r
120 *pxTopOfStack = 0x11UL;\r
121 pxTopOfStack--;\r
122 *pxTopOfStack = 0x22UL;\r
123 pxTopOfStack--;\r
124 *pxTopOfStack = 0x33UL;\r
125 pxTopOfStack--;\r
126 *pxTopOfStack = 0x44UL;\r
127 pxTopOfStack--;\r
128 *pxTopOfStack = 0x55UL;\r
129 pxTopOfStack--;\r
130 *pxTopOfStack = 0x66UL;\r
131 pxTopOfStack--;\r
132 *pxTopOfStack = 0x77UL;\r
133 pxTopOfStack--;\r
134 *pxTopOfStack = 0x88UL;\r
135 pxTopOfStack--;\r
136 *pxTopOfStack = 0x99UL;\r
137 pxTopOfStack--;\r
138 *pxTopOfStack = 0xaaUL;\r
139 pxTopOfStack--;\r
140 *pxTopOfStack = 0xbbUL;\r
141 pxTopOfStack--;\r
142 \r
143                 \r
144         /* Parameters in R4 then R3-R0. */\r
145 //      *pxTopOfStack = ( unsigned long ) pvParameters;\r
146 //      pxTopOfStack -= 5;\r
147 \r
148 *pxTopOfStack = 0x1UL;\r
149 pxTopOfStack--;\r
150 *pxTopOfStack = 0x2UL;\r
151 pxTopOfStack--;\r
152 *pxTopOfStack = 0x3UL;\r
153 pxTopOfStack--;\r
154 *pxTopOfStack = 0x4UL;\r
155 pxTopOfStack--;\r
156 *pxTopOfStack = 0x5UL;\r
157 //pxTopOfStack--;\r
158 \r
159 \r
160         /* GBR = global base register.\r
161            VBR = vector base register.\r
162            TBR = jump table base register.\r
163            R15 is the stack pointer. */\r
164 \r
165         return pxTopOfStack;\r
166 }\r
167 /*-----------------------------------------------------------*/\r
168 \r
169 portBASE_TYPE xPortStartScheduler( void )\r
170 {\r
171         /* Start the tick interrupt. */\r
172 //      prvSetupTimerInterrupt();\r
173         \r
174         /* Start the first task. */\r
175         trapa( 32 );\r
176 \r
177         /* Should not get here. */\r
178         return pdFAIL;\r
179 }\r
180 /*-----------------------------------------------------------*/\r
181 \r
182 void vPortEndScheduler( void )\r
183 {\r
184         /* Not implemented as there is nothing to return to. */\r
185 }\r
186 /*-----------------------------------------------------------*/\r
187 \r
188 void vPortTickInterrupt( void )\r
189 {\r
190         vTaskIncrementTick();\r
191         #if configUSE_PREEMPTION == 1\r
192                 vTaskSwitchContext();\r
193         #endif\r
194 }\r
195 /*-----------------------------------------------------------*/\r
196 \r
197 static void prvSetupTimerInterrupt( void )\r
198 {\r
199 extern void vApplicationSetupTimerInterrupt( void );\r
200 \r
201         /* Call an application function to set up the timer.  This way the application\r
202         can decide which peripheral to use.  A demo application is provided to show a\r
203         suitable example. */\r
204         vApplicationSetupTimerInterrupt();\r
205 }\r
206 /*-----------------------------------------------------------*/\r
207 \r
208 \r
209 \r