1 | /* |
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2 | * raw_exception.c - This file contains implementation of C functions to |
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3 | * Instantiate mpc5xx primary exception entries. |
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4 | * More detailled information can be found on the Motorola |
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5 | * site and more precisely in the following book: |
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6 | * |
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7 | * MPC555/MPC556 User's Manual |
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8 | * Motorola REF : MPC555UM/D Rev. 3, 2000 October 15 |
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9 | * |
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10 | * |
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11 | * MPC5xx port sponsored by Defence Research and Development Canada - Suffield |
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12 | * Copyright (C) 2004, Real-Time Systems Inc. (querbach@realtime.bc.ca) |
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13 | * |
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14 | * Derived from libcpu/powerpc/mpc8xx/exceptions/raw_exception.c: |
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15 | * |
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16 | * Copyright (C) 1999 Eric Valette (valette@crf.canon.fr) |
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17 | * Canon Centre Recherche France. |
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18 | * |
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19 | * The license and distribution terms for this file may be |
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20 | * found in found in the file LICENSE in this distribution or at |
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21 | * http://www.rtems.com/license/LICENSE. |
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22 | * |
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23 | * $Id$ |
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24 | */ |
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25 | |
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26 | #include <rtems/system.h> |
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27 | #include <rtems/score/cpu.h> |
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28 | #include <rtems/score/powerpc.h> |
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29 | #include <libcpu/raw_exception.h> |
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30 | #include <libcpu/cpuIdent.h> |
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31 | #include <rtems/bspIo.h> /* for printk */ |
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32 | #include <string.h> |
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33 | |
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34 | static rtems_raw_except_connect_data* raw_except_table; |
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35 | static rtems_raw_except_connect_data default_raw_except_entry; |
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36 | static rtems_raw_except_global_settings* local_settings; |
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37 | |
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38 | int mpc5xx_vector_is_valid(rtems_vector vector) |
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39 | { |
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40 | switch (current_ppc_cpu) { |
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41 | case PPC_5XX: |
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42 | switch(vector) { |
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43 | case ASM_RESET_VECTOR: |
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44 | case ASM_MACH_VECTOR: |
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45 | |
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46 | case ASM_EXT_VECTOR: |
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47 | case ASM_ALIGN_VECTOR: |
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48 | case ASM_PROG_VECTOR: |
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49 | case ASM_FLOAT_VECTOR: |
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50 | case ASM_DEC_VECTOR: |
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51 | |
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52 | case ASM_SYS_VECTOR: |
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53 | case ASM_TRACE_VECTOR: |
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54 | case ASM_FLOATASSIST_VECTOR: |
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55 | |
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56 | case ASM_SOFTEMUL_VECTOR: |
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57 | |
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58 | case ASM_IPROT_VECTOR: |
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59 | case ASM_DPROT_VECTOR: |
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60 | |
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61 | case ASM_DBREAK_VECTOR: |
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62 | case ASM_IBREAK_VECTOR: |
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63 | case ASM_MEBREAK_VECTOR: |
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64 | case ASM_NMEBREAK_VECTOR: |
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65 | return 1; |
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66 | default: |
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67 | return 0; |
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68 | } |
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69 | default: |
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70 | printk("Please complete libcpu/powerpc/mpc5xx/exceptions/raw_exception.c\n"); |
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71 | printk("current_ppc_cpu = %x\n", current_ppc_cpu); |
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72 | return 0; |
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73 | } |
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74 | } |
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75 | |
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76 | int mpc5xx_set_exception (const rtems_raw_except_connect_data* except) |
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77 | { |
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78 | unsigned int level; |
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79 | |
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80 | if (!mpc5xx_vector_is_valid(except->exceptIndex)) { |
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81 | return 0; |
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82 | } |
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83 | /* |
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84 | * Check if default handler is actually connected. If not issue an error. |
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85 | * You must first get the current handler via mpc5xx_get_current_exception |
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86 | * and then disconnect it using mpc5xx_delete_exception. |
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87 | * RATIONALE : to always have the same transition by forcing the user |
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88 | * to get the previous handler before accepting to disconnect. |
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89 | */ |
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90 | if (exception_handler_table[except->exceptIndex] != |
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91 | default_raw_except_entry.hdl.raw_hdl) { |
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92 | return 0; |
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93 | } |
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94 | |
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95 | _CPU_ISR_Disable(level); |
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96 | |
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97 | raw_except_table[except->exceptIndex] = *except; |
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98 | |
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99 | exception_handler_table[except->exceptIndex] = except->hdl.raw_hdl; |
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100 | except->on(except); |
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101 | |
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102 | _CPU_ISR_Enable(level); |
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103 | return 1; |
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104 | } |
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105 | |
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106 | int mpc5xx_get_current_exception (rtems_raw_except_connect_data* except) |
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107 | { |
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108 | if (!mpc5xx_vector_is_valid(except->exceptIndex)){ |
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109 | return 0; |
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110 | } |
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111 | |
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112 | *except = raw_except_table[except->exceptIndex]; |
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113 | |
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114 | return 1; |
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115 | } |
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116 | |
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117 | int mpc5xx_delete_exception (const rtems_raw_except_connect_data* except) |
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118 | { |
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119 | unsigned int level; |
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120 | |
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121 | if (!mpc5xx_vector_is_valid(except->exceptIndex)){ |
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122 | return 0; |
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123 | } |
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124 | /* |
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125 | * Check if handler passed is actually connected. If not issue an error. |
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126 | * You must first get the current handler via mpc5xx_get_current_exception |
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127 | * and then disconnect it using mpc5xx_delete_exception. |
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128 | * RATIONALE : to always have the same transition by forcing the user |
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129 | * to get the previous handler before accepting to disconnect. |
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130 | */ |
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131 | if (exception_handler_table[except->exceptIndex] != except->hdl.raw_hdl) { |
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132 | return 0; |
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133 | } |
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134 | |
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135 | _CPU_ISR_Disable(level); |
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136 | |
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137 | except->off(except); |
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138 | exception_handler_table[except->exceptIndex] = |
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139 | default_raw_except_entry.hdl.raw_hdl; |
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140 | |
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141 | raw_except_table[except->exceptIndex] = default_raw_except_entry; |
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142 | raw_except_table[except->exceptIndex].exceptIndex = except->exceptIndex; |
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143 | |
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144 | _CPU_ISR_Enable(level); |
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145 | |
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146 | return 1; |
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147 | } |
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148 | |
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149 | /* |
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150 | * Exception global init. |
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151 | * |
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152 | * Install exception handler pointers from the raw exception table into the |
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153 | * exception handler table. |
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154 | */ |
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155 | int mpc5xx_init_exceptions (rtems_raw_except_global_settings* config) |
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156 | { |
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157 | unsigned i; |
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158 | unsigned int level; |
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159 | |
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160 | /* |
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161 | * store various accelerators |
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162 | */ |
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163 | raw_except_table = config->rawExceptHdlTbl; |
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164 | local_settings = config; |
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165 | default_raw_except_entry = config->defaultRawEntry; |
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166 | |
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167 | _CPU_ISR_Disable(level); |
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168 | |
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169 | for (i = 0; i < NUM_EXCEPTIONS; i++) { |
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170 | exception_handler_table[i] = raw_except_table[i].hdl.raw_hdl; |
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171 | |
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172 | if (raw_except_table[i].hdl.raw_hdl != default_raw_except_entry.hdl.raw_hdl) { |
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173 | raw_except_table[i].on(&raw_except_table[i]); |
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174 | } |
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175 | else { |
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176 | raw_except_table[i].off(&raw_except_table[i]); |
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177 | } |
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178 | } |
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179 | _CPU_ISR_Enable(level); |
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180 | |
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181 | return 1; |
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182 | } |
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183 | |
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184 | int mpc5xx_get_exception_config (rtems_raw_except_global_settings** config) |
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185 | { |
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186 | *config = local_settings; |
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187 | return 1; |
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188 | } |
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