1 | /* |
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2 | * This is the C entry point for ALL RTEMS BSPs. It is invoked |
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3 | * from the assembly language initialization file usually called |
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4 | * start.S. It provides the framework for the BSP initialization |
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5 | * sequence. The basic flow of initialization is: |
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6 | * |
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7 | * + start.S: basic CPU setup (stack, zero BSS) |
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8 | * + boot_card |
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9 | * + bspstart.c: bsp_start - more advanced initialization |
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10 | * + rtems_initialize_executive_early |
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11 | * + all device drivers |
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12 | * + rtems_initialize_executive_late |
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13 | * + 1st task executes C++ global constructors |
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14 | * .... appplication runs ... |
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15 | * + exit |
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16 | * + back to here eventually |
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17 | * + bspclean.c: bsp_cleanup |
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18 | * |
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19 | * This style of initialization insures that the C++ global |
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20 | * constructors are executed after RTEMS is initialized. |
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21 | * |
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22 | * Thanks to Chris Johns <cjohns@plessey.com.au> for this idea. |
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23 | * |
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24 | * COPYRIGHT (c) 1989-2006. |
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25 | * On-Line Applications Research Corporation (OAR). |
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26 | * |
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27 | * The license and distribution terms for this file may be |
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28 | * found in the file LICENSE in this distribution or at |
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29 | * http://www.rtems.com/license/LICENSE. |
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30 | * |
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31 | * $Id$ |
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32 | */ |
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33 | |
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34 | #include <bsp.h> |
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35 | |
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36 | extern void bsp_start( void ); |
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37 | extern void bsp_cleanup( void ); |
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38 | |
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39 | extern rtems_configuration_table Configuration; |
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40 | extern rtems_configuration_table BSP_Configuration; |
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41 | extern rtems_cpu_table Cpu_table; |
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42 | |
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43 | rtems_api_configuration_table BSP_RTEMS_Configuration; |
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44 | |
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45 | #ifdef RTEMS_POSIX_API |
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46 | posix_api_configuration_table BSP_POSIX_Configuration; |
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47 | #endif |
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48 | |
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49 | rtems_interrupt_level bsp_isr_level; |
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50 | |
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51 | /* |
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52 | * Since there is a forward reference |
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53 | */ |
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54 | |
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55 | char *rtems_progname; |
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56 | |
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57 | int boot_card(int argc, char **argv, char **envp) |
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58 | { |
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59 | static char *argv_pointer = NULL; |
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60 | static char *envp_pointer = NULL; |
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61 | char **argv_p = &argv_pointer; |
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62 | char **envp_p = &envp_pointer; |
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63 | |
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64 | /* |
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65 | * Set things up so c_rtems_main() is called with real pointers for |
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66 | * argv and envp. If the BSP has passed us something useful, then |
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67 | * pass it on. Somehow we need to eventually make this available to |
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68 | * a real main() in user land. :) |
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69 | */ |
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70 | |
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71 | if ( argv ) |
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72 | argv_p = argv; |
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73 | |
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74 | if ( envp ) |
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75 | envp_p = envp; |
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76 | |
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77 | /* |
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78 | * Set default values for the CPU Table fields all ports must have. |
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79 | * These values can be overridden in bsp_start() but they are |
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80 | * right most of the time. |
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81 | */ |
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82 | |
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83 | Cpu_table.pretasking_hook = NULL; |
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84 | Cpu_table.predriver_hook = NULL; |
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85 | Cpu_table.postdriver_hook = NULL; |
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86 | Cpu_table.idle_task = NULL; |
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87 | Cpu_table.do_zero_of_workspace = FALSE; |
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88 | Cpu_table.interrupt_stack_size = RTEMS_MINIMUM_STACK_SIZE; |
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89 | Cpu_table.extra_mpci_receive_server_stack = 0; |
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90 | Cpu_table.stack_allocate_hook = NULL; |
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91 | Cpu_table.stack_free_hook = NULL; |
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92 | |
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93 | /* |
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94 | * Copy the configuration table so we and the BSP wants to change it. |
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95 | */ |
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96 | |
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97 | BSP_Configuration = Configuration; |
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98 | |
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99 | BSP_RTEMS_Configuration = *Configuration.RTEMS_api_configuration; |
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100 | BSP_Configuration.RTEMS_api_configuration = &BSP_RTEMS_Configuration; |
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101 | |
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102 | #ifdef RTEMS_POSIX_API |
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103 | BSP_POSIX_Configuration = *Configuration.POSIX_api_configuration; |
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104 | BSP_Configuration.POSIX_api_configuration = &BSP_POSIX_Configuration; |
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105 | #endif |
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106 | |
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107 | /* |
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108 | * Invoke Board Support Package initialization routine written in C. |
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109 | */ |
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110 | |
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111 | bsp_start(); |
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112 | |
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113 | /* |
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114 | * Initialize RTEMS but do NOT start multitasking. |
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115 | */ |
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116 | |
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117 | bsp_isr_level = |
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118 | rtems_initialize_executive_early( &BSP_Configuration, &Cpu_table ); |
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119 | |
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120 | /* |
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121 | * Call c_rtems_main() and eventually let the first task or the real |
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122 | * main() invoke the global constructors if there are any. |
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123 | */ |
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124 | |
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125 | if ((argc > 0) && argv && argv[0]) |
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126 | rtems_progname = argv[0]; |
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127 | else |
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128 | rtems_progname = "RTEMS"; |
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129 | |
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130 | rtems_initialize_executive_late( bsp_isr_level ); |
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131 | |
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132 | /*************************************************************** |
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133 | *************************************************************** |
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134 | * APPLICATION RUNS HERE!!! When it shuts down, we return!!! * |
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135 | *************************************************************** |
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136 | *************************************************************** |
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137 | */ |
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138 | |
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139 | /* |
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140 | * Perform any BSP specific shutdown actions. |
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141 | */ |
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142 | |
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143 | bsp_cleanup(); |
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144 | |
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145 | /* |
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146 | * Now return to the start code. |
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147 | */ |
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148 | |
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149 | return 0; |
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150 | } |
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