1 | /* |
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2 | * This set of routines starts the application. It includes application, |
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3 | * board, and monitor specific initialization and configuration. |
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4 | * The generic CPU dependent initialization has been performed |
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5 | * before any of these are invoked. |
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6 | * |
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7 | * COPYRIGHT (c) 1989-1999. |
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8 | * On-Line Applications Research Corporation (OAR). |
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9 | * All rights assigned to U.S. Government, 1994. |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.OARcorp.com/rtems/license.html. |
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14 | * |
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15 | * $Id$ |
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16 | */ |
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17 | |
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18 | #include <bsp.h> |
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19 | #include <rtems/libio.h> |
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20 | |
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21 | #include <libcsupport.h> |
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22 | |
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23 | #include <string.h> |
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24 | #include <fcntl.h> |
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25 | |
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26 | /* |
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27 | * The original table from the application and our copy of it with |
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28 | * some changes. |
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29 | */ |
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30 | |
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31 | extern rtems_configuration_table Configuration; |
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32 | rtems_configuration_table BSP_Configuration; |
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33 | |
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34 | rtems_cpu_table Cpu_table; |
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35 | rtems_unsigned32 bsp_isr_level; |
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36 | |
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37 | /* |
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38 | * Tells us where to put the workspace in case remote debugger is present. |
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39 | */ |
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40 | |
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41 | #if 0 |
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42 | extern rtems_unsigned32 rdb_start; |
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43 | #endif |
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44 | |
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45 | /* |
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46 | * Amount to increment itimer by each pass |
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47 | * It is a variable instead of a #define to allow the 'looptest' |
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48 | * script to bump it without recompiling rtems |
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49 | * |
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50 | * NOTE: This is based on the PA-RISC simulator. I don't know if we |
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51 | * can actually pull this trick on the PPC simulator. |
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52 | */ |
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53 | |
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54 | rtems_unsigned32 CPU_PPC_CLICKS_PER_TICK; |
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55 | |
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56 | #if PSIM_FAST_IDLE |
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57 | |
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58 | /* |
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59 | * Many of the tests are very slow on the simulator because they have |
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60 | * have 5 second delays hardwired in. |
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61 | * |
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62 | * Try to speed those tests up by speeding up the clock when in the idle task. |
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63 | * |
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64 | * NOTE: At the current setting, 5 second delays in the tests take |
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65 | * approximately 5 seconds of wall time. |
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66 | */ |
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67 | |
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68 | rtems_extension fast_idle_switch_hook( |
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69 | rtems_tcb *current_task, |
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70 | rtems_tcb *heir_task |
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71 | ) |
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72 | { |
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73 | static rtems_unsigned32 normal_clock = ~0; |
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74 | static rtems_unsigned32 fast_clock; |
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75 | |
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76 | /* init our params on first call */ |
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77 | if (normal_clock == (rtems_unsigned32) ~0) |
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78 | { |
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79 | normal_clock = CPU_PPC_CLICKS_PER_TICK; |
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80 | fast_clock = 10000; |
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81 | #if 0 |
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82 | fast_clock = CPU_PPC_CLICKS_PER_TICK / 0x10 ; |
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83 | #endif |
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84 | if (fast_clock == 0) /* handle pathological case */ |
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85 | fast_clock++; |
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86 | } |
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87 | |
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88 | /* |
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89 | * Run the clock faster when idle is in place. |
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90 | */ |
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91 | |
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92 | if (heir_task == _Thread_Idle) |
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93 | CPU_PPC_CLICKS_PER_TICK = fast_clock; |
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94 | else if (current_task == _Thread_Idle) |
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95 | CPU_PPC_CLICKS_PER_TICK = normal_clock; |
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96 | } |
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97 | |
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98 | #endif |
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99 | |
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100 | /* |
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101 | * Use the shared implementations of the following routines |
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102 | */ |
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103 | |
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104 | void bsp_postdriver_hook(void); |
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105 | void bsp_libc_init( void *, unsigned32, int ); |
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106 | |
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107 | /* |
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108 | * bsp_pretasking_hook |
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109 | * |
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110 | * BSP pretasking hook. Called just before drivers are initialized. |
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111 | * Used to setup libc and install any BSP extensions. |
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112 | */ |
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113 | |
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114 | void bsp_pretasking_hook(void) |
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115 | { |
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116 | extern int end; |
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117 | rtems_unsigned32 heap_start; |
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118 | rtems_unsigned32 heap_size; |
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119 | |
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120 | heap_start = (rtems_unsigned32) &end; |
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121 | if (heap_start & (CPU_ALIGNMENT-1)) |
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122 | heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1); |
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123 | |
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124 | heap_size = BSP_Configuration.work_space_start - (void *)&end; |
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125 | heap_size &= 0xfffffff0; /* keep it as a multiple of 16 bytes */ |
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126 | |
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127 | bsp_libc_init((void *) heap_start, heap_size, 0); |
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128 | |
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129 | #if PSIM_FAST_IDLE |
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130 | /* |
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131 | * Install the fast idle task switch extension |
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132 | * |
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133 | * On MP systems, might not want to do this; it confuses at least |
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134 | * one test (mp06) on the PA-RISC simulator |
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135 | */ |
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136 | |
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137 | #if 0 |
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138 | if (BSP_Configuration.User_multiprocessing_table == 0) |
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139 | #endif |
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140 | { |
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141 | rtems_extensions_table fast_idle_extension; |
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142 | rtems_id extension_id; |
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143 | rtems_status_code rc; |
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144 | |
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145 | memset(&fast_idle_extension, 0, sizeof(fast_idle_extension)); |
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146 | |
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147 | fast_idle_extension.thread_switch = fast_idle_switch_hook; |
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148 | |
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149 | rc = rtems_extension_create( |
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150 | rtems_build_name('F', 'D', 'L', 'E'), |
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151 | &fast_idle_extension, |
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152 | &extension_id |
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153 | ); |
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154 | if (rc != RTEMS_SUCCESSFUL) |
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155 | rtems_fatal_error_occurred(rc); |
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156 | } |
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157 | #endif |
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158 | |
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159 | #ifdef RTEMS_DEBUG |
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160 | rtems_debug_enable( RTEMS_DEBUG_ALL_MASK ); |
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161 | #endif |
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162 | |
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163 | } |
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164 | |
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165 | /* |
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166 | * bsp_start |
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167 | * |
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168 | * This routine does the bulk of the system initialization. |
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169 | */ |
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170 | |
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171 | void bsp_start( void ) |
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172 | { |
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173 | unsigned char *work_space_start; |
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174 | |
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175 | #if 0 |
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176 | /* |
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177 | * Set MSR to show vectors at 0 XXX |
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178 | */ |
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179 | _CPU_MSR_Value( msr_value ); |
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180 | msr_value &= ~PPC_MSR_EP; |
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181 | _CPU_MSR_SET( msr_value ); |
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182 | #endif |
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183 | |
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184 | /* |
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185 | * Set up our hooks |
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186 | * Make sure libc_init is done before drivers initialized so that |
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187 | * they can use atexit() |
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188 | */ |
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189 | |
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190 | Cpu_table.pretasking_hook = bsp_pretasking_hook; /* init libc, etc. */ |
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191 | Cpu_table.postdriver_hook = bsp_postdriver_hook; |
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192 | |
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193 | /* |
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194 | * Is this true? |
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195 | * |
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196 | * PSIM does zero out memory BUT only when IT begins execution. Thus |
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197 | * if we want to have a clean slate in the workspace each time we |
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198 | * begin execution of OUR application, then we must zero the workspace. |
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199 | * |
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200 | * It is true that it takes simulated time to clear the memory. |
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201 | */ |
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202 | |
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203 | Cpu_table.do_zero_of_workspace = FALSE; |
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204 | |
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205 | Cpu_table.interrupt_stack_size = (12 * 1024); |
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206 | |
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207 | /* |
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208 | * The monitor likes the exception table to be at 0x0. |
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209 | */ |
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210 | |
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211 | Cpu_table.exceptions_in_RAM = TRUE; |
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212 | |
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213 | /* |
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214 | #if defined(RTEMS_POSIX_API) |
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215 | BSP_Configuration.work_space_size *= 3; |
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216 | #endif |
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217 | */ |
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218 | |
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219 | BSP_Configuration.work_space_size += 1024; |
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220 | |
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221 | #if 0 |
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222 | work_space_start = |
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223 | (unsigned char *)rdb_start - BSP_Configuration.work_space_size; |
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224 | #endif |
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225 | |
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226 | work_space_start = |
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227 | (unsigned char *)&RAM_END - BSP_Configuration.work_space_size; |
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228 | |
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229 | if ( work_space_start <= (unsigned char *)&end ) { |
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230 | DEBUG_puts( "bspstart: Not enough RAM!!!\n" ); |
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231 | bsp_cleanup(); |
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232 | } |
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233 | |
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234 | BSP_Configuration.work_space_start = work_space_start; |
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235 | |
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236 | /* |
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237 | * Account for the console's resources |
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238 | */ |
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239 | |
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240 | console_reserve_resources( &BSP_Configuration ); |
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241 | |
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242 | #if PSIM_FAST_IDLE |
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243 | /* |
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244 | * Add 1 extension for fast idle |
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245 | */ |
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246 | |
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247 | BSP_Configuration.maximum_extensions++; |
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248 | #endif |
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249 | |
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250 | /* |
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251 | * Set the "clicks per tick" for the simulator |
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252 | * used by XXX/clock/clock.c to schedule interrupts |
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253 | * |
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254 | * NOTE: On psim, each click of the decrementer register corresponds |
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255 | * to 1 instruction. By setting this to 100, we are indicating |
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256 | * that we are assuming it can execute 100 instructions per |
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257 | * microsecond. This corresponds to sustaining 1 instruction |
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258 | * per cycle at 100 Mhz. Whether this is a good guess or not |
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259 | * is anyone's guess. |
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260 | */ |
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261 | |
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262 | { |
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263 | extern int PSIM_INSTRUCTIONS_PER_MICROSECOND; |
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264 | |
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265 | CPU_PPC_CLICKS_PER_TICK = BSP_Configuration.microseconds_per_tick * |
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266 | (int) &PSIM_INSTRUCTIONS_PER_MICROSECOND; |
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267 | } |
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268 | } |
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