2 FreeRTOS V4.1.1 - Copyright (C) 2003-2006 Richard Barry.
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3 MCF5235 Port - Copyright (C) 2006 Christian Walter.
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5 This file is part of the FreeRTOS distribution.
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7 FreeRTOS is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License** as published by
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9 the Free Software Foundation; either version 2 of the License, or
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10 (at your option) any later version.
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12 FreeRTOS is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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17 You should have received a copy of the GNU General Public License
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18 along with FreeRTOS; if not, write to the Free Software
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19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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21 A special exception to the GPL can be applied should you wish to distribute
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22 a combined work that includes FreeRTOS, without being obliged to provide
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23 the source code for any proprietary components. See the licensing section
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24 of http://www.FreeRTOS.org for full details of how and when the exception
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27 ***************************************************************************
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28 ***************************************************************************
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30 * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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32 * This is a concise, step by step, 'hands on' guide that describes both *
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33 * general multitasking concepts and FreeRTOS specifics. It presents and *
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34 * explains numerous examples that are written using the FreeRTOS API. *
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35 * Full source code for all the examples is provided in an accompanying *
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38 ***************************************************************************
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39 ***************************************************************************
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41 Please ensure to read the configuration and relevant port sections of the
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42 online documentation.
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44 http://www.FreeRTOS.org - Documentation, latest information, license and
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47 http://www.SafeRTOS.com - A version that is certified for use in safety
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50 http://www.OpenRTOS.com - Commercial support, development, porting,
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51 licensing and training services.
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61 /* ------------------------ Data types for Coldfire ----------------------- */
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62 #define portCHAR char
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63 #define portFLOAT float
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64 #define portDOUBLE double
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65 #define portLONG long
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66 #define portSHORT short
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67 #define portSTACK_TYPE unsigned int
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68 #define portBASE_TYPE int
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70 typedef portSTACK_TYPE StackType_t;
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71 typedef long BaseType_t;
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72 typedef unsigned long UBaseType_t;
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74 #if( configUSE_16_BIT_TICKS == 1 )
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75 typedef uint16_t TickType_t;
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76 #define portMAX_DELAY ( TickType_t ) 0xffff
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78 typedef uint32_t TickType_t;
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79 #define portMAX_DELAY ( TickType_t ) 0xffffffffUL
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82 /* ------------------------ Architecture specifics ------------------------ */
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83 #define portSTACK_GROWTH ( -1 )
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84 #define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
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85 #define portBYTE_ALIGNMENT 4
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87 #define portTRAP_YIELD 0 /* Trap 0 */
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88 #define portIPL_MAX 7 /* Only NMI interrupt 7 allowed. */
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90 /* ------------------------ FreeRTOS macros for port ---------------------- */
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93 * This function must be called when the current state of the active task
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94 * should be stored. It must be called immediately after exception
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95 * processing from the CPU, i.e. there exists a Coldfire exception frame at
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96 * the current position in the stack. The function reserves space on
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97 * the stack for the CPU registers and other task dependent values (e.g
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98 * ulCriticalNesting) and updates the top of the stack in the TCB.
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100 #define portSAVE_CONTEXT() \
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101 asm volatile ( /* reserve space for task state. */ \
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102 "lea.l (-64, %sp), %sp\n\t" \
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103 /* push data register %d0-%d7/%a0-%a6 on stack. */ \
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104 "movem.l %d0-%d7/%a0-%a6, (%sp)\n\t" \
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105 /* push ulCriticalNesting counter on stack. */ \
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106 "lea.l (60, %sp), %a0\n\t" \
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107 "move.l ulCriticalNesting, (%a0)\n\t" \
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108 /* set the new top of the stack in the TCB. */ \
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109 "move.l pxCurrentTCB, %a0\n\t" \
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110 "move.l %sp, (%a0)");
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113 * This function restores the current active and continues its execution.
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114 * It loads the current TCB and restores the processor registers, the
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115 * task dependent values (e.g ulCriticalNesting). Finally execution
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116 * is continued by executing an rte instruction.
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118 #define portRESTORE_CONTEXT() \
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119 asm volatile ( "move.l pxCurrentTCB, %sp\n\t" \
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120 "move.l (%sp), %sp\n\t" \
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121 /* stack pointer now points to the saved registers. */ \
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122 "movem.l (%sp), %d0-%d7/%a0-%a6\n\t" \
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123 /* restore ulCriticalNesting counter from stack. */ \
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124 "lea.l (%sp, 60), %sp\n\t" \
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125 "move.l (%sp)+, ulCriticalNesting\n\t" \
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126 /* stack pointer now points to exception frame. */ \
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129 #define portENTER_CRITICAL() \
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130 vPortEnterCritical();
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132 #define portEXIT_CRITICAL() \
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133 vPortExitCritical();
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135 #define portSET_IPL( xIPL ) \
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136 asm_set_ipl( xIPL )
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138 #define portDISABLE_INTERRUPTS() \
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139 do { ( void )portSET_IPL( portIPL_MAX ); } while( 0 )
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140 #define portENABLE_INTERRUPTS() \
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141 do { ( void )portSET_IPL( 0 ); } while( 0 )
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143 #define portYIELD() \
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144 asm volatile ( " trap %0\n\t" : : "i"(portTRAP_YIELD) )
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146 #define portNOP() \
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147 asm volatile ( "nop\n\t" )
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149 #define portENTER_SWITCHING_ISR() \
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150 asm volatile ( "move.w #0x2700, %sr" ); \
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151 /* Save the context of the interrupted task. */ \
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152 portSAVE_CONTEXT( ); \
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155 #define portEXIT_SWITCHING_ISR( SwitchRequired ) \
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156 /* If a switch is required we call vTaskSwitchContext(). */ \
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157 if( SwitchRequired ) \
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159 vTaskSwitchContext( ); \
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162 portRESTORE_CONTEXT( );
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164 /* ------------------------ Function prototypes --------------------------- */
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165 void vPortEnterCritical( void );
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166 void vPortExitCritical( void );
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167 int asm_set_ipl( uint32_t int uiNewIPL );
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169 /* ------------------------ Compiler specifics ---------------------------- */
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170 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) \
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171 void vFunction( void *pvParameters )
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173 #define portTASK_FUNCTION( vFunction, pvParameters ) \
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174 void vFunction( void *pvParameters )
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181 #endif /* PORTMACRO_H */
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