1 | /* m68k.h |
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2 | * |
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3 | * This include file contains information pertaining to the Motorola |
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4 | * m68xxx processor family. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1998. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * Copyright assigned to U.S. Government, 1994. |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.OARcorp.com/rtems/license.html. |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | #ifndef __M68k_h |
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18 | #define __M68k_h |
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19 | |
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20 | #ifdef __cplusplus |
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21 | extern "C" { |
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22 | #endif |
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23 | |
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24 | /* |
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25 | * This section contains the information required to build |
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26 | * RTEMS for a particular member of the Motorola MC68xxx |
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27 | * family. It does this by setting variables to indicate |
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28 | * which implementation dependent features are present in |
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29 | * a particular member of the family. |
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30 | * |
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31 | * Currently recognized: |
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32 | * -m68000 |
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33 | * -m68000 -msoft-float |
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34 | * -m68020 |
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35 | * -m68020 -msoft-float |
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36 | * -m68030 |
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37 | * -m68040 -msoft-float |
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38 | * -m68040 |
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39 | * -m68040 -msoft-float |
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40 | * -m68302 (no FP) (deprecated, use -m68000) |
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41 | * -m68332 (no FP) (deprecated, use -mcpu32) |
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42 | * -mcpu32 (no FP) |
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43 | * |
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44 | * As of gcc 2.8.1 and egcs 1.1, there is no distinction made between |
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45 | * the CPU32 and CPU32+. The option -mcpu32 generates code which can |
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46 | * be run on either core. RTEMS distinguishes between these two cores |
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47 | * because they have different alignment rules which impact performance. |
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48 | * If you are using a CPU32+, then the symbol RTEMS__mcpu32p__ should |
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49 | * be defined in your custom file (see make/custom/gen68360.cfg for an |
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50 | * example of how to do this. If gcc ever distinguishes between these |
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51 | * two cores, then RTEMS__mcpu32p__ usage will be replaced with the |
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52 | * appropriate compiler defined predefine. |
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53 | * |
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54 | * Here is some information on the 040 variants (courtesy of Doug McBride, |
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55 | * mcbride@rodin.colorado.edu): |
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56 | * |
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57 | * "The 68040 is a superset of the 68EC040 and the 68LC040. The |
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58 | * 68EC040 and 68LC040 do not have FPU's. The 68LC040 and the |
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59 | * 68EC040 have renamed the DLE pin as JS0 which must be tied to |
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60 | * Gnd or Vcc. The 68EC040 has renamed the MDIS pin as JS1. The |
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61 | * 68EC040 has access control units instead of memory management units. |
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62 | * The 68EC040 should not have the PFLUSH or PTEST instructions executed |
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63 | * (cause an indeterminate result). The 68EC040 and 68LC040 do not |
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64 | * implement the DLE or multiplexed bus modes. The 68EC040 does not |
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65 | * implement the output buffer impedance selection mode of operation." |
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66 | * |
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67 | * M68K_HAS_EXTB_L is used to enable/disable usage of the extb.l instruction |
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68 | * which is not available for 68000 or 68ec000 cores (68000, 68001, 68008, |
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69 | * 68010, 68302, 68306, 68307). This instruction is available on the 68020 |
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70 | * up and the cpu32 based models. |
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71 | * |
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72 | * M68K_HAS_MISALIGNED is non-zero if the CPU allows byte-misaligned |
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73 | * data access (68020, 68030, 68040, 68060, CPU32+). |
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74 | * |
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75 | * NOTE: |
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76 | * Eventually it would be nice to evaluate doing a lot of this section |
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77 | * by having each model specify which core it uses and then go from there. |
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78 | */ |
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79 | |
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80 | #if defined(__mc68020__) |
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81 | |
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82 | #define CPU_MODEL_NAME "m68020" |
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83 | #define M68K_HAS_VBR 1 |
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84 | #define M68K_HAS_SEPARATE_STACKS 1 |
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85 | #define M68K_HAS_BFFFO 1 |
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86 | #define M68K_HAS_PREINDEXING 1 |
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87 | #define M68K_HAS_EXTB_L 1 |
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88 | #define M68K_HAS_MISALIGNED 1 |
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89 | # if defined (__HAVE_68881__) |
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90 | # define M68K_HAS_FPU 1 |
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91 | # define M68K_HAS_FPSP_PACKAGE 0 |
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92 | # else |
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93 | # define M68K_HAS_FPU 0 |
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94 | # define M68K_HAS_FPSP_PACKAGE 0 |
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95 | # endif |
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96 | |
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97 | #elif defined(__mc68030__) |
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98 | |
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99 | #define CPU_MODEL_NAME "m68030" |
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100 | #define M68K_HAS_VBR 1 |
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101 | #define M68K_HAS_SEPARATE_STACKS 1 |
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102 | #define M68K_HAS_BFFFO 1 |
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103 | #define M68K_HAS_PREINDEXING 1 |
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104 | #define M68K_HAS_EXTB_L 1 |
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105 | #define M68K_HAS_MISALIGNED 1 |
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106 | # if defined (__HAVE_68881__) |
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107 | # define M68K_HAS_FPU 1 |
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108 | # define M68K_HAS_FPSP_PACKAGE 0 |
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109 | # else |
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110 | # define M68K_HAS_FPU 0 |
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111 | # define M68K_HAS_FPSP_PACKAGE 0 |
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112 | # endif |
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113 | |
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114 | #elif defined(__mc68040__) |
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115 | |
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116 | #define CPU_MODEL_NAME "m68040" |
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117 | #define M68K_HAS_VBR 1 |
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118 | #define M68K_HAS_SEPARATE_STACKS 1 |
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119 | #define M68K_HAS_BFFFO 1 |
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120 | #define M68K_HAS_PREINDEXING 1 |
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121 | #define M68K_HAS_EXTB_L 1 |
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122 | #define M68K_HAS_MISALIGNED 1 |
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123 | # if defined (__HAVE_68881__) |
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124 | # define M68K_HAS_FPU 1 |
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125 | # define M68K_HAS_FPSP_PACKAGE 1 |
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126 | # else |
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127 | # define M68K_HAS_FPU 0 |
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128 | # define M68K_HAS_FPSP_PACKAGE 0 |
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129 | # endif |
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130 | |
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131 | #elif defined(__mc68302__) |
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132 | #define CPU_MODEL_NAME "m68302" |
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133 | #define M68K_HAS_VBR 0 |
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134 | #define M68K_HAS_SEPARATE_STACKS 0 |
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135 | #define M68K_HAS_BFFFO 0 |
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136 | #define M68K_HAS_PREINDEXING 0 |
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137 | #define M68K_HAS_EXTB_L 0 |
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138 | #define M68K_HAS_MISALIGNED 0 |
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139 | #define M68K_HAS_FPU 0 |
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140 | #define M68K_HAS_FPSP_PACKAGE 0 |
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141 | |
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142 | /* gcc and egcs do not distinguish between CPU32 and CPU32+ */ |
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143 | #elif defined(RTEMS__mcpu32p__) |
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144 | |
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145 | #define CPU_MODEL_NAME "mcpu32+" |
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146 | #define M68K_HAS_VBR 1 |
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147 | #define M68K_HAS_SEPARATE_STACKS 0 |
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148 | #define M68K_HAS_BFFFO 0 |
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149 | #define M68K_HAS_PREINDEXING 1 |
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150 | #define M68K_HAS_EXTB_L 1 |
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151 | #define M68K_HAS_MISALIGNED 1 |
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152 | #define M68K_HAS_FPU 0 |
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153 | #define M68K_HAS_FPSP_PACKAGE 0 |
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154 | |
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155 | #elif defined(__mcpu32__) |
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156 | |
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157 | #define CPU_MODEL_NAME "mcpu32" |
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158 | #define M68K_HAS_VBR 1 |
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159 | #define M68K_HAS_SEPARATE_STACKS 0 |
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160 | #define M68K_HAS_BFFFO 0 |
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161 | #define M68K_HAS_PREINDEXING 1 |
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162 | #define M68K_HAS_EXTB_L 1 |
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163 | #define M68K_HAS_MISALIGNED 0 |
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164 | #define M68K_HAS_FPU 0 |
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165 | #define M68K_HAS_FPSP_PACKAGE 0 |
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166 | |
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167 | #elif defined(__mc68000__) |
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168 | |
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169 | #define CPU_MODEL_NAME "m68000" |
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170 | #define M68K_HAS_VBR 0 |
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171 | #define M68K_HAS_SEPARATE_STACKS 0 |
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172 | #define M68K_HAS_BFFFO 0 |
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173 | #define M68K_HAS_PREINDEXING 0 |
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174 | #define M68K_HAS_EXTB_L 0 |
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175 | #define M68K_HAS_MISALIGNED 0 |
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176 | # if defined (__HAVE_68881__) |
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177 | # define M68K_HAS_FPU 1 |
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178 | # define M68K_HAS_FPSP_PACKAGE 0 |
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179 | # else |
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180 | # define M68K_HAS_FPU 0 |
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181 | # define M68K_HAS_FPSP_PACKAGE 0 |
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182 | # endif |
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183 | |
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184 | #else |
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185 | |
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186 | #error "Unsupported CPU model -- are you sure you're running a 68k compiler?" |
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187 | |
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188 | #endif |
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189 | |
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190 | /* |
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191 | * Define the name of the CPU family. |
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192 | */ |
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193 | |
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194 | #define CPU_NAME "Motorola MC68xxx" |
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195 | |
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196 | #ifndef ASM |
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197 | |
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198 | #define m68k_disable_interrupts( _level ) \ |
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199 | asm volatile ( "movew %%sr,%0\n\t" \ |
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200 | "orw #0x0700,%%sr" \ |
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201 | : "=d" (_level)) |
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202 | |
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203 | #define m68k_enable_interrupts( _level ) \ |
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204 | asm volatile ( "movew %0,%%sr " : : "d" (_level)); |
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205 | |
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206 | #define m68k_flash_interrupts( _level ) \ |
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207 | asm volatile ( "movew %0,%%sr\n\t" \ |
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208 | "orw #0x0700,%%sr" \ |
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209 | : : "d" (_level)) |
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210 | |
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211 | #define m68k_get_interrupt_level( _level ) \ |
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212 | do { \ |
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213 | register unsigned32 _tmpsr; \ |
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214 | \ |
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215 | asm volatile( "movw %%sr,%0" : "=d" (_tmpsr)); \ |
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216 | _level = (_tmpsr & 0x0700) >> 8; \ |
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217 | } while (0) |
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218 | |
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219 | #define m68k_set_interrupt_level( _newlevel ) \ |
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220 | do { \ |
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221 | register unsigned32 _tmpsr; \ |
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222 | \ |
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223 | asm volatile( "movw %%sr,%0" : "=d" (_tmpsr)); \ |
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224 | _tmpsr = (_tmpsr & 0xf8ff) | ((_newlevel) << 8); \ |
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225 | asm volatile( "movw %0,%%sr" : : "d" (_tmpsr)); \ |
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226 | } while (0) |
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227 | |
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228 | #if ( M68K_HAS_VBR == 1 ) |
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229 | #define m68k_get_vbr( vbr ) \ |
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230 | asm volatile ( "movec %%vbr,%0 " : "=r" (vbr)) |
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231 | |
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232 | #define m68k_set_vbr( vbr ) \ |
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233 | asm volatile ( "movec %0,%%vbr " : : "r" (vbr)) |
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234 | #else |
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235 | #define m68k_get_vbr( _vbr ) _vbr = (void *)_VBR |
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236 | #define m68k_set_vbr( _vbr ) |
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237 | #endif |
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238 | |
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239 | /* |
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240 | * The following routine swaps the endian format of an unsigned int. |
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241 | * It must be static because it is referenced indirectly. |
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242 | */ |
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243 | |
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244 | static inline unsigned int m68k_swap_u32( |
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245 | unsigned int value |
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246 | ) |
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247 | { |
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248 | unsigned int swapped = value; |
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249 | |
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250 | asm volatile( "rorw #8,%0" : "=d" (swapped) : "0" (swapped) ); |
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251 | asm volatile( "swap %0" : "=d" (swapped) : "0" (swapped) ); |
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252 | asm volatile( "rorw #8,%0" : "=d" (swapped) : "0" (swapped) ); |
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253 | |
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254 | return( swapped ); |
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255 | } |
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256 | |
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257 | static inline unsigned int m68k_swap_u16( |
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258 | unsigned int value |
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259 | ) |
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260 | { |
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261 | unsigned short swapped = value; |
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262 | |
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263 | asm volatile( "rorw #8,%0" : "=d" (swapped) : "0" (swapped) ); |
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264 | |
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265 | return( swapped ); |
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266 | } |
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267 | |
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268 | /* XXX this is only valid for some m68k family members and should be fixed */ |
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269 | |
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270 | #define m68k_enable_caching() \ |
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271 | { register unsigned32 _ctl=0x01; \ |
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272 | asm volatile ( "movec %0,%%cacr" \ |
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273 | : "=d" (_ctl) : "0" (_ctl) ); \ |
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274 | } |
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275 | |
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276 | #define CPU_swap_u32( value ) m68k_swap_u32( value ) |
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277 | #define CPU_swap_u16( value ) m68k_swap_u16( value ) |
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278 | |
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279 | #endif /* !ASM */ |
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280 | |
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281 | #ifdef __cplusplus |
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282 | } |
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283 | #endif |
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284 | |
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285 | #endif |
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286 | /* end of include file */ |
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