1 | /*-------------------------------------------------------------------------+ |
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2 | | This file contains the PC386 BSP startup package. It includes application, |
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3 | | board, and monitor specific initialization and configuration. The generic CPU |
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4 | | dependent initialization has been performed before this routine is invoked. |
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5 | +--------------------------------------------------------------------------+ |
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6 | | (C) Copyright 1997 - |
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7 | | - NavIST Group - Real-Time Distributed Systems and Industrial Automation |
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8 | | |
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9 | | http://pandora.ist.utl.pt |
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10 | | |
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11 | | Instituto Superior Tecnico * Lisboa * PORTUGAL |
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12 | +--------------------------------------------------------------------------+ |
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13 | | Disclaimer: |
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14 | | |
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15 | | This file is provided "AS IS" without warranty of any kind, either |
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16 | | expressed or implied. |
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17 | +--------------------------------------------------------------------------+ |
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18 | | This code is based on: |
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19 | | bspstart.c,v 1.8 1996/05/28 13:12:40 joel Exp - go32 BSP |
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20 | | With the following copyright notice: |
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21 | | ************************************************************************** |
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22 | | * COPYRIGHT (c) 1989-1999. |
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23 | | * On-Line Applications Research Corporation (OAR). |
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24 | | * |
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25 | | * The license and distribution terms for this file may be |
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26 | | * found in found in the file LICENSE in this distribution or at |
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27 | | * http://www.OARcorp.com/rtems/license.html. |
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28 | | ************************************************************************** |
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29 | | |
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30 | | $Id$ |
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31 | +--------------------------------------------------------------------------*/ |
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32 | |
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33 | |
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34 | #include <bsp.h> |
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35 | #include <rtems/libio.h> |
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36 | #include <rtems/libcsupport.h> |
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37 | #include <libcpu/cpuModel.h> |
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38 | |
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39 | /*-------------------------------------------------------------------------+ |
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40 | | Global Variables |
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41 | +--------------------------------------------------------------------------*/ |
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42 | extern rtems_unsigned32 _end; /* End of BSS. Defined in 'linkcmds'. */ |
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43 | /* |
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44 | * Size of heap if it is 0 it will be dynamically defined by memory size, |
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45 | * otherwise the value should be changed by binary patch |
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46 | */ |
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47 | rtems_unsigned32 _heap_size = 0; |
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48 | |
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49 | /* Size of stack used during initialization. Defined in 'start.s'. */ |
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50 | extern rtems_unsigned32 _stack_size; |
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51 | |
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52 | rtems_unsigned32 rtemsFreeMemStart; |
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53 | /* Address of start of free memory - should be updated |
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54 | after creating new partitions or regions. */ |
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55 | |
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56 | /* The original BSP configuration table from the application and our copy of it |
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57 | with some changes. */ |
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58 | |
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59 | extern rtems_configuration_table Configuration; |
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60 | rtems_configuration_table BSP_Configuration; |
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61 | |
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62 | rtems_cpu_table Cpu_table; /* CPU configuration table. */ |
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63 | char *rtems_progname; /* Program name - from main(). */ |
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64 | |
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65 | /*-------------------------------------------------------------------------+ |
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66 | | External Prototypes |
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67 | +--------------------------------------------------------------------------*/ |
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68 | extern void rtems_irq_mngt_init(void); |
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69 | void bsp_libc_init( void *, unsigned32, int ); |
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70 | void bsp_postdriver_hook(void); |
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71 | |
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72 | /*-------------------------------------------------------------------------+ |
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73 | | Function: bsp_pretasking_hook |
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74 | | Description: BSP pretasking hook. Called just before drivers are |
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75 | | initialized. Used to setup libc and install any BSP |
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76 | | extensions. NOTE: Must not use libc (to do io) from here, |
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77 | | since drivers are not yet initialized. |
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78 | | Global Variables: None. |
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79 | | Arguments: None. |
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80 | | Returns: Nothing. |
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81 | +--------------------------------------------------------------------------*/ |
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82 | void bsp_pretasking_hook(void) |
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83 | { |
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84 | rtems_unsigned32 topAddr, val; |
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85 | int i; |
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86 | |
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87 | |
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88 | if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1)) /* not aligned => align it */ |
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89 | rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1); |
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90 | |
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91 | if(_heap_size == 0) |
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92 | { |
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93 | /* |
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94 | * We have to dynamically size memory. Memory size can be anything |
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95 | * between 2M and 2048M. |
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96 | * let us first write |
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97 | */ |
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98 | for(i=2048; i>=2; i--) |
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99 | { |
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100 | topAddr = i*1024*1024 - 4; |
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101 | *(volatile rtems_unsigned32 *)topAddr = topAddr; |
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102 | } |
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103 | |
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104 | for(i=2; i<=2048; i++) |
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105 | { |
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106 | topAddr = i*1024*1024 - 4; |
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107 | val = *(rtems_unsigned32 *)topAddr; |
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108 | if(val != topAddr) |
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109 | { |
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110 | break; |
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111 | } |
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112 | } |
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113 | |
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114 | topAddr = (i-1)*1024*1024 - 4; |
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115 | |
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116 | _heap_size = topAddr - rtemsFreeMemStart; |
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117 | } |
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118 | |
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119 | bsp_libc_init((void *)rtemsFreeMemStart, _heap_size, 0); |
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120 | rtemsFreeMemStart += _heap_size; /* HEAP_SIZE in KBytes */ |
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121 | |
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122 | |
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123 | #ifdef RTEMS_DEBUG |
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124 | |
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125 | rtems_debug_enable(RTEMS_DEBUG_ALL_MASK); |
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126 | |
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127 | #endif /* RTEMS_DEBUG */ |
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128 | } /* bsp_pretasking_hook */ |
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129 | |
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130 | |
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131 | /*-------------------------------------------------------------------------+ |
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132 | | Function: bsp_start |
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133 | | Description: Called before main is invoked. |
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134 | | Global Variables: None. |
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135 | | Arguments: None. |
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136 | | Returns: Nothing. |
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137 | +--------------------------------------------------------------------------*/ |
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138 | void bsp_start_default( void ) |
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139 | { |
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140 | void Calibrate_loop_1ms(void); |
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141 | |
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142 | /* |
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143 | * Calibrate variable for 1ms-loop (see timer.c) |
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144 | */ |
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145 | Calibrate_loop_1ms(); |
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146 | |
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147 | rtemsFreeMemStart = (rtems_unsigned32)&_end + _stack_size; |
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148 | /* set the value of start of free memory. */ |
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149 | |
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150 | /* If we don't have command line arguments set default program name. */ |
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151 | |
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152 | Cpu_table.pretasking_hook = bsp_pretasking_hook; /* init libc, etc. */ |
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153 | Cpu_table.predriver_hook = NULL; /* use system's */ |
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154 | Cpu_table.postdriver_hook = bsp_postdriver_hook; |
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155 | Cpu_table.idle_task = NULL; |
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156 | /* do not override system IDLE task */ |
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157 | Cpu_table.do_zero_of_workspace = TRUE; |
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158 | Cpu_table.interrupt_table_segment = get_ds(); |
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159 | Cpu_table.interrupt_table_offset = (void *)Interrupt_descriptor_table; |
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160 | Cpu_table.interrupt_stack_size = CONFIGURE_INTERRUPT_STACK_MEMORY; |
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161 | Cpu_table.extra_mpci_receive_server_stack = 0; |
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162 | |
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163 | /* Place RTEMS workspace at beginning of free memory. */ |
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164 | |
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165 | if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1)) /* not aligned => align it */ |
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166 | rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1); |
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167 | |
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168 | BSP_Configuration.work_space_start = (void *)rtemsFreeMemStart; |
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169 | rtemsFreeMemStart += BSP_Configuration.work_space_size; |
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170 | |
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171 | /* |
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172 | * Init rtems interrupt management |
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173 | */ |
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174 | rtems_irq_mngt_init(); |
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175 | /* |
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176 | * Init rtems exceptions management |
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177 | */ |
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178 | rtems_exception_init_mngt(); |
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179 | /* |
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180 | * The following information is very useful when debugging. |
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181 | */ |
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182 | |
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183 | #if 0 |
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184 | printk( "work_space_size = 0x%x\n", BSP_Configuration.work_space_size ); |
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185 | printk( "maximum_extensions = 0x%x\n", BSP_Configuration.maximum_extensions ); |
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186 | printk( "microseconds_per_tick = 0x%x\n", |
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187 | BSP_Configuration.microseconds_per_tick ); |
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188 | printk( "ticks_per_timeslice = 0x%x\n", |
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189 | BSP_Configuration.ticks_per_timeslice ); |
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190 | printk( "maximum_devices = 0x%x\n", BSP_Configuration.maximum_devices ); |
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191 | printk( "number_of_device_drivers = 0x%x\n", |
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192 | BSP_Configuration.number_of_device_drivers ); |
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193 | printk( "Device_driver_table = 0x%x\n", |
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194 | BSP_Configuration.Device_driver_table ); |
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195 | |
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196 | printk( "_heap_size = 0x%x\n", _heap_size ); |
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197 | printk( "_stack_size = 0x%x\n", _stack_size ); |
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198 | printk( "rtemsFreeMemStart = 0x%x\n", rtemsFreeMemStart ); |
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199 | printk( "work_space_start = 0x%x\n", BSP_Configuration.work_space_start ); |
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200 | printk( "work_space_size = 0x%x\n", BSP_Configuration.work_space_size ); |
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201 | #endif |
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202 | } /* bsp_start */ |
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203 | |
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204 | /* |
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205 | * By making this a weak alias for bsp_start_default, a brave soul |
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206 | * can override the actual bsp_start routine used. |
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207 | */ |
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208 | |
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209 | void bsp_start (void) __attribute__ ((weak, alias("bsp_start_default"))); |
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