1 | /* |
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2 | * raw_exception.c - This file contains implementation of C function to |
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3 | * Instanciate 8xx ppc primary exception entries. |
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4 | * More detailled information can be found on motorola |
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5 | * site and more precisely in the following book : |
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6 | * |
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7 | * MPC860 |
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8 | * Risc Microporcessor User's Manual |
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9 | * Motorola REF : MPC860UM/AD |
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10 | * |
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11 | * Copyright (C) 1999 Eric Valette (valette@crf.canon.fr) |
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12 | * Canon Centre Recherche France. |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.com/license/LICENSE. |
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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 <rtems/system.h> |
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22 | #include <rtems/score/cpu.h> |
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23 | #include <rtems/score/powerpc.h> |
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24 | #include <libcpu/raw_exception.h> |
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25 | #include <libcpu/cpuIdent.h> |
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26 | #include <rtems/bspIo.h> /* for printk */ |
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27 | #include <string.h> |
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28 | |
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29 | void * codemove(void *, const void *, unsigned int, unsigned long); |
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30 | |
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31 | static rtems_raw_except_connect_data* raw_except_table; |
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32 | static rtems_raw_except_connect_data default_raw_except_entry; |
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33 | static rtems_raw_except_global_settings* local_settings; |
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34 | |
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35 | int mpc860_vector_is_valid(rtems_vector vector) |
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36 | { |
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37 | switch(vector) { |
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38 | case ASM_RESET_VECTOR: /* fall through */ |
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39 | case ASM_MACH_VECTOR: |
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40 | case ASM_PROT_VECTOR: |
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41 | case ASM_ISI_VECTOR: |
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42 | case ASM_EXT_VECTOR: |
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43 | case ASM_ALIGN_VECTOR: |
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44 | case ASM_PROG_VECTOR: |
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45 | case ASM_FLOAT_VECTOR: |
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46 | case ASM_DEC_VECTOR: |
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47 | |
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48 | case ASM_SYS_VECTOR: |
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49 | case ASM_TRACE_VECTOR: |
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50 | case ASM_FLOATASSIST_VECTOR: |
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51 | |
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52 | case ASM_SOFTEMUL_VECTOR: |
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53 | case ASM_ITLBMISS_VECTOR: |
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54 | case ASM_DTLBMISS_VECTOR: |
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55 | case ASM_ITLBERROR_VECTOR: |
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56 | case ASM_DTLBERROR_VECTOR: |
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57 | |
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58 | case ASM_DBREAK_VECTOR: |
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59 | case ASM_IBREAK_VECTOR: |
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60 | case ASM_PERIFBREAK_VECTOR: |
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61 | case ASM_DEVPORT_VECTOR: |
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62 | return 1; |
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63 | default: return 0; |
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64 | } |
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65 | } |
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66 | |
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67 | int mpc8xx_vector_is_valid(rtems_vector vector) |
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68 | { |
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69 | switch (current_ppc_cpu) { |
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70 | case PPC_860: |
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71 | if (!mpc860_vector_is_valid(vector)) { |
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72 | return 0; |
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73 | } |
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74 | break; |
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75 | default: |
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76 | printk("Please complete libcpu/powerpc/mpc8xx/exceptions/raw_exception.c\n"); |
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77 | printk("current_ppc_cpu = %x\n", current_ppc_cpu); |
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78 | return 0; |
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79 | } |
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80 | return 1; |
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81 | } |
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82 | |
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83 | int mpc8xx_set_exception (const rtems_raw_except_connect_data* except) |
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84 | { |
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85 | rtems_interrupt_level level; |
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86 | |
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87 | if (!mpc8xx_vector_is_valid(except->exceptIndex)) { |
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88 | return 0; |
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89 | } |
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90 | /* |
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91 | * Check if default handler is actually connected. If not issue an error. |
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92 | * You must first get the current handler via mpc8xx_get_current_exception |
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93 | * and then disconnect it using mpc8xx_delete_exception. |
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94 | * RATIONALE : to always have the same transition by forcing the user |
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95 | * to get the previous handler before accepting to disconnect. |
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96 | */ |
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97 | if (memcmp(mpc8xx_get_vector_addr(except->exceptIndex), (void*)default_raw_except_entry.hdl.raw_hdl,default_raw_except_entry.hdl.raw_hdl_size)) { |
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98 | return 0; |
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99 | } |
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100 | |
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101 | rtems_interrupt_disable(level); |
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102 | |
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103 | raw_except_table [except->exceptIndex] = *except; |
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104 | codemove((void*)mpc8xx_get_vector_addr(except->exceptIndex), |
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105 | except->hdl.raw_hdl, |
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106 | except->hdl.raw_hdl_size, |
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107 | PPC_CACHE_ALIGNMENT); |
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108 | except->on(except); |
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109 | |
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110 | rtems_interrupt_enable(level); |
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111 | return 1; |
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112 | } |
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113 | |
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114 | int mpc8xx_get_current_exception (rtems_raw_except_connect_data* except) |
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115 | { |
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116 | if (!mpc8xx_vector_is_valid(except->exceptIndex)){ |
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117 | return 0; |
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118 | } |
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119 | |
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120 | *except = raw_except_table [except->exceptIndex]; |
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121 | |
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122 | return 1; |
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123 | } |
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124 | |
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125 | int mpc8xx_delete_exception (const rtems_raw_except_connect_data* except) |
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126 | { |
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127 | rtems_interrupt_level level; |
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128 | |
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129 | if (!mpc8xx_vector_is_valid(except->exceptIndex)){ |
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130 | return 0; |
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131 | } |
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132 | /* |
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133 | * Check if handler passed is actually connected. If not issue an error. |
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134 | * You must first get the current handler via mpc8xx_get_current_exception |
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135 | * and then disconnect it using mpc8xx_delete_exception. |
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136 | * RATIONALE : to always have the same transition by forcing the user |
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137 | * to get the previous handler before accepting to disconnect. |
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138 | */ |
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139 | if (memcmp(mpc8xx_get_vector_addr(except->exceptIndex), |
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140 | (void*)except->hdl.raw_hdl, |
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141 | except->hdl.raw_hdl_size)) { |
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142 | return 0; |
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143 | } |
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144 | rtems_interrupt_disable(level); |
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145 | |
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146 | except->off(except); |
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147 | codemove((void*)mpc8xx_get_vector_addr(except->exceptIndex), |
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148 | default_raw_except_entry.hdl.raw_hdl, |
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149 | default_raw_except_entry.hdl.raw_hdl_size, |
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150 | PPC_CACHE_ALIGNMENT); |
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151 | |
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152 | |
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153 | raw_except_table[except->exceptIndex] = default_raw_except_entry; |
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154 | raw_except_table[except->exceptIndex].exceptIndex = except->exceptIndex; |
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155 | |
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156 | rtems_interrupt_enable(level); |
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157 | |
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158 | return 1; |
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159 | } |
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160 | |
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161 | /* |
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162 | * Exception global init. |
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163 | */ |
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164 | int mpc8xx_init_exceptions (rtems_raw_except_global_settings* config) |
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165 | { |
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166 | int i; |
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167 | rtems_interrupt_level level; |
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168 | |
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169 | /* |
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170 | * store various accelerators |
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171 | */ |
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172 | raw_except_table = config->rawExceptHdlTbl; |
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173 | local_settings = config; |
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174 | default_raw_except_entry = config->defaultRawEntry; |
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175 | |
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176 | rtems_interrupt_disable(level); |
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177 | |
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178 | for (i=0; i <= LAST_VALID_EXC; i++) { |
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179 | if (!mpc8xx_vector_is_valid(i)){ |
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180 | continue; |
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181 | } |
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182 | codemove((void*)mpc8xx_get_vector_addr(i), |
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183 | raw_except_table[i].hdl.raw_hdl, |
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184 | raw_except_table[i].hdl.raw_hdl_size, |
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185 | PPC_CACHE_ALIGNMENT); |
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186 | if (raw_except_table[i].hdl.raw_hdl != default_raw_except_entry.hdl.raw_hdl) { |
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187 | raw_except_table[i].on(&raw_except_table[i]); |
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188 | } |
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189 | else { |
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190 | raw_except_table[i].off(&raw_except_table[i]); |
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191 | } |
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192 | } |
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193 | rtems_interrupt_enable(level); |
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194 | |
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195 | return 1; |
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196 | } |
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197 | |
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198 | int mpc8xx_get_exception_config (rtems_raw_except_global_settings** config) |
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199 | { |
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200 | *config = local_settings; |
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201 | return 1; |
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202 | } |
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