1 | /* bspstart.c |
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2 | * |
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3 | * This set of routines starts the application. It includes application, |
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4 | * board, and monitor specific initialization and configuration. |
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5 | * The generic CPU dependent initialization has been performed |
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6 | * before this routine is invoked. |
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7 | * |
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8 | * COPYRIGHT (c) 1989-1998. |
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9 | * On-Line Applications Research Corporation (OAR). |
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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 | * Modifications for MBX860: |
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16 | * Copyright (c) 1999, National Research Council of Canada |
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17 | * |
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18 | * $Id$ |
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19 | */ |
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20 | |
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21 | #include <string.h> |
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22 | |
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23 | #include <bsp.h> |
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24 | #include <rtems/libio.h> |
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25 | #include <rtems/libcsupport.h> |
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26 | |
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27 | /* |
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28 | * The original table from the application (in ROM) and our copy of it with |
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29 | * some changes. Configuration is defined in <confdefs.h>. Make sure that |
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30 | * our configuration tables are uninitialized so that they get allocated in |
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31 | * the .bss section (RAM). |
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32 | */ |
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33 | extern rtems_configuration_table Configuration; |
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34 | rtems_configuration_table BSP_Configuration; |
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35 | |
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36 | rtems_cpu_table Cpu_table; |
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37 | |
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38 | char *rtems_progname; |
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39 | |
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40 | /* |
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41 | * Use the shared implementations of the following routines. |
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42 | * Look in rtems/c/src/lib/libbsp/shared/bsppost.c and |
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43 | * rtems/c/src/lib/libbsp/shared/bsplibc.c. |
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44 | */ |
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45 | void bsp_postdriver_hook(void); |
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46 | void bsp_libc_init( void *, unsigned32, int ); |
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47 | |
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48 | /* |
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49 | * bsp_pretasking_hook |
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50 | * |
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51 | * Called when RTEMS initialization is complete but before interrupts and |
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52 | * tasking are enabled. Used to setup libc and install any BSP extensions. |
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53 | * |
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54 | * Must not use libc (to do io) from here, since drivers are not yet |
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55 | * initialized. |
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56 | * |
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57 | * Installed in the rtems_cpu_table defined in |
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58 | * rtems/c/src/exec/score/cpu/m68k/cpu.h in main() below. Called from |
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59 | * rtems_initialize_executive() defined in rtems/c/src/exec/sapi/src/init.c |
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60 | * |
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61 | * Input parameters: NONE |
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62 | * |
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63 | * Output parameters: NONE |
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64 | * |
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65 | * Return values: NONE |
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66 | */ |
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67 | void bsp_pretasking_hook(void) |
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68 | { |
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69 | /* |
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70 | * These are assigned addresses in the linkcmds file for the BSP. This |
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71 | * approach is better than having these defined as manifest constants and |
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72 | * compiled into the kernel, but it is still not ideal when dealing with |
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73 | * multiprocessor configuration in which each board as a different memory |
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74 | * map. A better place for defining these symbols might be the makefiles. |
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75 | * Consideration should also be given to developing an approach in which |
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76 | * the kernel and the application can be linked and burned into ROM |
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77 | * independently of each other. |
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78 | */ |
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79 | extern unsigned char _HeapStart; |
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80 | extern unsigned char _HeapEnd; |
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81 | |
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82 | bsp_libc_init( &_HeapStart, &_HeapEnd - &_HeapStart, 0 ); |
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83 | |
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84 | #ifdef RTEMS_DEBUG |
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85 | rtems_debug_enable( RTEMS_DEBUG_ALL_MASK ); |
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86 | #endif |
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87 | } |
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88 | |
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89 | |
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90 | /* |
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91 | * bsp_start() |
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92 | * |
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93 | * Board-specific initialization code. Called from the generic boot_card() |
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94 | * function defined in rtems/c/src/lib/libbsp/shared/main.c. That function |
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95 | * does some of the board independent initialization. It is called from the |
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96 | * MBX8xx entry point _start() defined in |
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97 | * rtems/c/src/lib/libbsp/powerpc/mbx8xx/startup/start.S |
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98 | * |
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99 | * _start() has set up a stack, has zeroed the .bss section, has turned off |
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100 | * interrupts, and placed the processor in the supervisor mode. boot_card() |
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101 | * has left the processor in that state when bsp_start() was called. |
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102 | * |
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103 | * RUNS WITH ADDRESS TRANSLATION AND CACHING TURNED OFF! |
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104 | * ASSUMES THAT THE VIRTUAL ADDRESSES WILL BE IDENTICAL TO THE PHYSICAL |
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105 | * ADDRESSES. Software-controlled address translation would be required |
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106 | * otherwise. |
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107 | * |
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108 | * Input parameters: NONE |
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109 | * |
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110 | * Output parameters: NONE |
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111 | * |
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112 | * Return values: NONE |
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113 | */ |
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114 | void bsp_start(void) |
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115 | { |
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116 | extern void *_WorkspaceBase; |
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117 | unsigned32 r1; |
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118 | |
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119 | mmu_init(); |
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120 | |
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121 | /* |
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122 | * Enable instruction and data caches. Do not force writethrough mode. |
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123 | */ |
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124 | #ifdef INSTRUCTION_CACHE_ENABLE |
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125 | r1 = M8xx_CACHE_CMD_ENABLE; |
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126 | _mtspr( M8xx_IC_CST, r1 ); |
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127 | _isync; |
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128 | #endif |
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129 | |
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130 | /* |
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131 | * Warning: EPPCBug 1.1 chokes to death if the data cache is turned on. |
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132 | * Set DATA_CACHE_ENABLE to zero in mbx8xx.cfg if EPPCBUG is used. |
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133 | */ |
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134 | #ifdef DATA_CACHE_ENABLE |
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135 | r1 = M8xx_CACHE_CMD_ENABLE; |
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136 | _mtspr( M8xx_DC_CST, r1 ); |
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137 | _isync; |
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138 | #endif |
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139 | |
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140 | /* |
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141 | * Allocate the memory for the RTEMS Work Space. This can come from |
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142 | * a variety of places: hard coded address, malloc'ed from outside |
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143 | * RTEMS world (e.g. simulator or primitive memory manager), or (as |
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144 | * typically done by stock BSPs) by subtracting the required amount |
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145 | * of work space from the last physical address on the CPU board. |
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146 | * |
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147 | * In this case, the memory is not malloc'ed. It is just |
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148 | * "pulled from the air". |
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149 | */ |
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150 | BSP_Configuration.work_space_start = (void *)&_WorkspaceBase; |
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151 | |
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152 | /* |
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153 | * initialize the CPU table for this BSP |
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154 | */ |
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155 | |
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156 | Cpu_table.pretasking_hook = bsp_pretasking_hook; /* init libc, etc. */ |
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157 | Cpu_table.postdriver_hook = bsp_postdriver_hook; |
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158 | if( Cpu_table.interrupt_stack_size < 4 * 1024 ) |
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159 | Cpu_table.interrupt_stack_size = 4 * 1024; |
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160 | |
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161 | Cpu_table.clicks_per_usec = 1; /* for 4MHz extclk */ |
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162 | Cpu_table.serial_per_sec = 10000000; |
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163 | Cpu_table.serial_external_clock = 1; |
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164 | Cpu_table.serial_xon_xoff = 0; |
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165 | Cpu_table.serial_cts_rts = 1; |
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166 | Cpu_table.serial_rate = 9600; |
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167 | #if ( defined(mbx821_001) || defined(mbx821_001b) || defined(mbx860_001b) ) |
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168 | Cpu_table.clock_speed = 50000000; |
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169 | Cpu_table.timer_average_overhead = 3; |
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170 | Cpu_table.timer_least_valid = 3; |
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171 | #else |
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172 | Cpu_table.clock_speed = 40000000; |
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173 | Cpu_table.timer_average_overhead = 3; |
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174 | Cpu_table.timer_least_valid = 3; |
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175 | #endif |
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176 | |
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177 | /* |
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178 | * Call this in case we use TERMIOS for console I/O |
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179 | */ |
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180 | m8xx_uart_reserve_resources( &BSP_Configuration ); |
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181 | |
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182 | m8xx.scc2.sccm=0; |
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183 | m8xx.scc2p.rbase=0; |
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184 | m8xx.scc2p.tbase=0; |
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185 | m8xx_cp_execute_cmd( M8xx_CR_OP_STOP_TX | M8xx_CR_CHAN_SCC2 ); |
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186 | } |
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187 | |
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