1 | /** |
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2 | * @file rtems/score/powerpc.h |
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3 | */ |
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4 | |
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5 | /* |
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6 | * This file contains definitions for the IBM/Motorola PowerPC |
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7 | * family members. |
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8 | * |
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9 | * Author: Andrew Bray <andy@i-cubed.co.uk> |
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10 | * |
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11 | * COPYRIGHT (c) 1995 by i-cubed ltd. |
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12 | * |
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13 | * MPC860 support code was added by Jay Monkman <jmonkman@frasca.com> |
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14 | * MPC8260 support added by Andy Dachs <a.dachs@sstl.co.uk> |
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15 | * Surrey Satellite Technology Limited |
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16 | * |
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17 | * To anyone who acknowledges that this file is provided "AS IS" |
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18 | * without any express or implied warranty: |
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19 | * permission to use, copy, modify, and distribute this file |
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20 | * for any purpose is hereby granted without fee, provided that |
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21 | * the above copyright notice and this notice appears in all |
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22 | * copies, and that the name of i-cubed limited not be used in |
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23 | * advertising or publicity pertaining to distribution of the |
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24 | * software without specific, written prior permission. |
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25 | * i-cubed limited makes no representations about the suitability |
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26 | * of this software for any purpose. |
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27 | * |
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28 | * Derived from c/src/exec/cpu/no_cpu/no_cpu.h: |
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29 | * |
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30 | * COPYRIGHT (c) 1989-1997. |
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31 | * On-Line Applications Research Corporation (OAR). |
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32 | * |
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33 | * The license and distribution terms for this file may in |
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34 | * the file LICENSE in this distribution or at |
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35 | * http://www.rtems.com/license/LICENSE. |
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36 | * |
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37 | * |
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38 | * Note: |
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39 | * This file is included by both C and assembler code ( -DASM ) |
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40 | */ |
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41 | |
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42 | |
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43 | #ifndef _RTEMS_SCORE_POWERPC_H |
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44 | #define _RTEMS_SCORE_POWERPC_H |
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45 | |
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46 | #ifdef __cplusplus |
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47 | extern "C" { |
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48 | #endif |
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49 | |
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50 | #include <rtems/score/types.h> |
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51 | |
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52 | /* |
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53 | * Define the name of the CPU family. |
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54 | */ |
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55 | |
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56 | #define CPU_NAME "PowerPC" |
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57 | |
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58 | /* |
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59 | * This file contains the information required to build |
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60 | * RTEMS for the PowerPC family. |
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61 | */ |
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62 | |
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63 | /* Generic ppc */ |
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64 | |
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65 | #ifdef _SOFT_FLOAT |
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66 | #define CPU_MODEL_NAME "Generic (no FPU)" |
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67 | #elif defined(__NO_FPRS__) || defined(__SPE__) |
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68 | #define CPU_MODEL_NAME "Generic (E500/float-gprs/SPE)" |
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69 | #else |
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70 | #define CPU_MODEL_NAME "Generic (classic FPU)" |
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71 | #endif |
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72 | |
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73 | #define PPC_ALIGNMENT 8 |
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74 | #define PPC_STRUCTURE_ALIGNMENT 32 |
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75 | |
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76 | /* |
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77 | * Application binary interfaces. |
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78 | * |
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79 | * PPC_ABI MUST be defined as one of these. |
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80 | * Only big endian is currently supported. |
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81 | */ |
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82 | |
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83 | /* |
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84 | * SVR4 ABI |
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85 | */ |
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86 | #define PPC_ABI_SVR4 2 |
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87 | /* |
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88 | * Embedded ABI |
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89 | */ |
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90 | #define PPC_ABI_EABI 3 |
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91 | |
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92 | /* |
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93 | * Default to the EABI used by current GNU tools |
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94 | */ |
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95 | |
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96 | #ifndef PPC_ABI |
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97 | #define PPC_ABI PPC_ABI_EABI |
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98 | #endif |
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99 | |
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100 | #if (PPC_ABI == PPC_ABI_SVR4) || defined(__ALTIVEC__) |
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101 | #define PPC_STACK_ALIGNMENT 16 |
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102 | #elif (PPC_ABI == PPC_ABI_EABI) |
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103 | #if 1 |
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104 | /* Till.S: 2008/07/10; AFAIK, the CPU_STACK_ALIGNMENT is only |
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105 | * used to align the top of the stack. We don't lose much |
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106 | * if we always align TOS to 16-bytes but we then are always |
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107 | * OK, even if the user tells the compiler to generate 16-byte |
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108 | * alignment. |
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109 | */ |
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110 | #define PPC_STACK_ALIGNMENT 16 |
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111 | #else |
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112 | #define PPC_STACK_ALIGNMENT 8 |
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113 | #endif |
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114 | #else |
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115 | #error "PPC_ABI is not properly defined" |
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116 | #endif |
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117 | |
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118 | /* |
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119 | * Assume PPC_HAS_FPU to be a synonym for _SOFT_FLOAT. |
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120 | */ |
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121 | |
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122 | #if defined(_SOFT_FLOAT) || defined(__NO_FPRS__) /* e500 has unified integer/FP registers */ |
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123 | #define PPC_HAS_FPU 0 |
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124 | #else |
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125 | #define PPC_HAS_FPU 1 |
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126 | #endif |
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127 | |
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128 | /* |
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129 | * Unless specified above, If the model has FP support, it is assumed to |
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130 | * support doubles (8-byte floating point numbers). |
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131 | * |
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132 | * If the model does NOT have FP support, then the model does |
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133 | * NOT have double length FP registers. |
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134 | */ |
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135 | |
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136 | #if (PPC_HAS_FPU) |
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137 | #define PPC_HAS_DOUBLE 1 |
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138 | #else |
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139 | #define PPC_HAS_DOUBLE 0 |
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140 | #endif |
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141 | |
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142 | /* |
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143 | * Assemblers. |
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144 | * PPC_ASM MUST be defined as one of these. |
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145 | * |
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146 | * PPC_ASM_ELF: ELF assembler. Currently used for all ABIs. |
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147 | * |
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148 | * NOTE: Only PPC_ABI_ELF is currently fully supported. |
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149 | * |
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150 | * Also NOTE: cpukit doesn't need this but asm.h which is defined |
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151 | * in cpukit for consistency with other ports does. |
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152 | */ |
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153 | |
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154 | #define PPC_ASM_ELF 0 |
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155 | |
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156 | /* |
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157 | * Default to the assembler format used by the current GNU tools. |
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158 | */ |
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159 | #define PPC_ASM PPC_ASM_ELF |
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160 | |
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161 | |
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162 | #ifdef __cplusplus |
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163 | } |
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164 | #endif |
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165 | |
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166 | #endif /* _RTEMS_SCORE_POWERPC_H */ |
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