[ac7d5ef0] | 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, 1990, 1991, 1992, 1993, 1994. |
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| 7 | * On-Line Applications Research Corporation (OAR). |
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| 8 | * All rights assigned to U.S. Government, 1994. |
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| 9 | * |
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| 10 | * This material may be reproduced by or for the U.S. Government pursuant |
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| 11 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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| 12 | * notice must appear in all copies of this file and its derivatives. |
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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 | * The following define the CPU Family and Model within the family |
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| 26 | * |
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| 27 | * NOTE: The string "REPLACE_THIS_WITH_THE_CPU_MODEL" is replaced |
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| 28 | * with the name of the appropriate macro for this target CPU. |
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| 29 | */ |
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| 30 | |
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[88d594a] | 31 | #ifdef m68k |
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| 32 | #undef m68k |
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| 33 | #endif |
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[ac7d5ef0] | 34 | #define m68k |
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[88d594a] | 35 | |
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| 36 | #ifdef REPLACE_THIS_WITH_THE_CPU_MODEL |
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| 37 | #undef REPLACE_THIS_WITH_THE_CPU_MODEL |
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| 38 | #endif |
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[ac7d5ef0] | 39 | #define REPLACE_THIS_WITH_THE_CPU_MODEL |
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[88d594a] | 40 | |
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| 41 | #ifdef REPLACE_THIS_WITH_THE_BSP |
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| 42 | #undef REPLACE_THIS_WITH_THE_BSP |
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| 43 | #endif |
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[ac7d5ef0] | 44 | #define REPLACE_THIS_WITH_THE_BSP |
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| 45 | |
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| 46 | /* |
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| 47 | * This section contains the information required to build |
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| 48 | * RTEMS for a particular member of the Motorola MC68xxx |
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| 49 | * family. It does this by setting variables to indicate |
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| 50 | * which implementation dependent features are present in |
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| 51 | * a particular member of the family. |
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| 52 | * |
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| 53 | * Currently recognized: |
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| 54 | * m68000 (no FP) |
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| 55 | * m68020 (implies FP) |
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| 56 | * m68020_nofp (no FP) |
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| 57 | * m68030 (implies FP) |
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| 58 | * m68040 (implies FP) |
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| 59 | * m68lc040 (no FP) |
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| 60 | * m68ec040 (no FP) |
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[110f4ff7] | 61 | * m68360 (no FP) |
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[ac7d5ef0] | 62 | * |
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| 63 | * Primary difference (for RTEMS) between m68040, m680lc040, and |
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[110f4ff7] | 64 | * m68ec040 is the presence or absence of the FPU. |
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[ac7d5ef0] | 65 | * |
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| 66 | * Here is some information on the 040 variants (courtesy of Doug McBride, |
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| 67 | * mcbride@rodin.colorado.edu): |
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| 68 | * |
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| 69 | * "The 68040 is a superset of the 68EC040 and the 68LC040. The |
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| 70 | * 68EC040 and 68LC040 do not have FPU's. The 68LC040 and the |
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| 71 | * 68EC040 have renamed the DLE pin as JS0 which must be tied to |
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| 72 | * Gnd or Vcc. The 68EC040 has renamed the MDIS pin as JS1. The |
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| 73 | * 68EC040 has access control units instead of memory management units. |
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| 74 | * The 68EC040 should not have the PFLUSH or PTEST instructions executed |
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| 75 | * (cause an indeterminate result). The 68EC040 and 68LC040 do not |
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| 76 | * implement the DLE or multiplexed bus modes. The 68EC040 does not |
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| 77 | * implement the output buffer impedance selection mode of operation." |
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| 78 | */ |
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| 79 | |
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| 80 | #if defined(m68000) |
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| 81 | |
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[5e9b32b] | 82 | #define CPU_MODEL_NAME "m68000" |
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[ac7d5ef0] | 83 | #define M68K_HAS_VBR 0 |
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| 84 | #define M68K_HAS_SEPARATE_STACKS 0 |
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| 85 | #define M68K_HAS_FPU 0 |
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| 86 | #define M68K_HAS_BFFFO 0 |
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| 87 | #define M68K_HAS_PREINDEXING 0 |
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| 88 | |
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| 89 | #elif defined(m68020) |
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| 90 | |
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[5e9b32b] | 91 | #define CPU_MODEL_NAME "m68020" |
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[ac7d5ef0] | 92 | #define M68K_HAS_VBR 1 |
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| 93 | #define M68K_HAS_SEPARATE_STACKS 1 |
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| 94 | #define M68K_HAS_FPU 1 |
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| 95 | #define M68K_HAS_BFFFO 1 |
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| 96 | #define M68K_HAS_PREINDEXING 1 |
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| 97 | |
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| 98 | #elif defined(m68020_nofp) |
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| 99 | |
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[5e9b32b] | 100 | #define CPU_MODEL_NAME "m68020 w/o fp" |
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[ac7d5ef0] | 101 | #define M68K_HAS_VBR 1 |
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| 102 | #define M68K_HAS_SEPARATE_STACKS 1 |
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| 103 | #define M68K_HAS_FPU 0 |
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| 104 | #define M68K_HAS_BFFFO 1 |
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| 105 | #define M68K_HAS_PREINDEXING 1 |
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| 106 | |
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| 107 | #elif defined(m68030) |
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| 108 | |
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[5e9b32b] | 109 | #define CPU_MODEL_NAME "m68030" |
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[ac7d5ef0] | 110 | #define M68K_HAS_VBR 1 |
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| 111 | #define M68K_HAS_SEPARATE_STACKS 1 |
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| 112 | #define M68K_HAS_FPU 1 |
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| 113 | #define M68K_HAS_BFFFO 1 |
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| 114 | #define M68K_HAS_PREINDEXING 1 |
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| 115 | |
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| 116 | #elif defined(m68040) |
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| 117 | |
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[5e9b32b] | 118 | #define CPU_MODEL_NAME "m68040" |
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[ac7d5ef0] | 119 | #define M68K_HAS_VBR 1 |
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| 120 | #define M68K_HAS_SEPARATE_STACKS 1 |
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| 121 | #define M68K_HAS_FPU 1 |
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| 122 | #define M68K_HAS_BFFFO 1 |
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| 123 | #define M68K_HAS_PREINDEXING 1 |
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| 124 | |
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| 125 | #elif defined(m68lc040) |
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| 126 | |
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[5e9b32b] | 127 | #define CPU_MODEL_NAME "m68lc040" |
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[ac7d5ef0] | 128 | #define M68K_HAS_VBR 1 |
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| 129 | #define M68K_HAS_SEPARATE_STACKS 1 |
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| 130 | #define M68K_HAS_FPU 0 |
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| 131 | #define M68K_HAS_BFFFO 1 |
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| 132 | #define M68K_HAS_PREINDEXING 1 |
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| 133 | |
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| 134 | #elif defined(m68ec040) |
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| 135 | |
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[5e9b32b] | 136 | #define CPU_MODEL_NAME "m68ec040" |
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[ac7d5ef0] | 137 | #define M68K_HAS_VBR 1 |
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| 138 | #define M68K_HAS_SEPARATE_STACKS 1 |
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| 139 | #define M68K_HAS_FPU 0 |
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| 140 | #define M68K_HAS_BFFFO 1 |
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| 141 | #define M68K_HAS_PREINDEXING 1 |
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| 142 | |
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[38ffa0c] | 143 | #elif defined(m68332) |
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| 144 | |
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[5e9b32b] | 145 | #define CPU_MODEL_NAME "m68332" |
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[38ffa0c] | 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_FPU 0 |
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| 149 | #define M68K_HAS_BFFFO 0 |
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| 150 | #define M68K_HAS_PREINDEXING 0 |
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| 151 | |
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[110f4ff7] | 152 | #elif defined(m68360) |
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| 153 | |
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| 154 | #define CPU_MODEL_NAME "m68360" |
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| 155 | #define M68K_HAS_VBR 1 |
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| 156 | #define M68K_HAS_SEPARATE_STACKS 0 |
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| 157 | #define M68K_HAS_FPU 0 |
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| 158 | #define M68K_HAS_BFFFO 0 |
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| 159 | #define M68K_HAS_PREINDEXING 1 |
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| 160 | |
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[ac7d5ef0] | 161 | #else |
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| 162 | |
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| 163 | #error "Unsupported CPU Model" |
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| 164 | |
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| 165 | #endif |
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| 166 | |
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| 167 | /* |
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| 168 | * If defined, this causes some of the macros to initialize their |
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| 169 | * variables to zero before doing inline assembly. This gets rid |
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| 170 | * of compile time warnings at the cost of a little execution time |
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| 171 | * in some time critical routines. |
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| 172 | */ |
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| 173 | |
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| 174 | #define NO_UNINITIALIZED_WARNINGS |
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| 175 | |
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| 176 | /* |
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| 177 | * Define the name of the CPU family. |
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| 178 | */ |
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| 179 | |
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| 180 | #define CPU_NAME "Motorola MC68xxx" |
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| 181 | |
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| 182 | #ifndef ASM |
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| 183 | |
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| 184 | #ifdef NO_UNINITIALIZED_WARNINGS |
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| 185 | #define m68k_disable_interrupts( _level ) \ |
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| 186 | { \ |
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| 187 | (_level) = 0; /* avoids warnings */ \ |
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| 188 | asm volatile ( "movew %%sr,%0 ; \ |
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| 189 | orw #0x0700,%%sr" \ |
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| 190 | : "=d" ((_level)) : "0" ((_level)) \ |
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| 191 | ); \ |
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| 192 | } |
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| 193 | #else |
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| 194 | #define m68k_disable_interrupts( _level ) \ |
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| 195 | { \ |
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| 196 | asm volatile ( "movew %%sr,%0 ; \ |
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| 197 | orw #0x0700,%%sr" \ |
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| 198 | : "=d" ((_level)) : "0" ((_level)) \ |
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| 199 | ); \ |
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| 200 | } |
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| 201 | #endif |
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| 202 | |
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| 203 | #define m68k_enable_interrupts( _level ) \ |
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| 204 | { \ |
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| 205 | asm volatile ( "movew %0,%%sr " \ |
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| 206 | : "=d" ((_level)) : "0" ((_level)) \ |
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| 207 | ); \ |
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| 208 | } |
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| 209 | |
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| 210 | #define m68k_flash_interrupts( _level ) \ |
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| 211 | { \ |
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| 212 | asm volatile ( "movew %0,%%sr ; \ |
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| 213 | orw #0x0700,%%sr" \ |
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| 214 | : "=d" ((_level)) : "0" ((_level)) \ |
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| 215 | ); \ |
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| 216 | } |
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| 217 | |
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[3a4ae6c] | 218 | #define m68k_get_interrupt_level( _level ) \ |
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| 219 | do { \ |
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| 220 | register unsigned32 _tmpsr = 0; \ |
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| 221 | \ |
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| 222 | asm volatile( "movw %%sr,%0" \ |
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| 223 | : "=d" (_tmpsr) : "0" (_tmpsr) \ |
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| 224 | ); \ |
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| 225 | \ |
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| 226 | _level = (_tmpsr & 0x0700) >> 8; \ |
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| 227 | } while (0) |
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| 228 | |
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[ac7d5ef0] | 229 | #define m68k_set_interrupt_level( _newlevel ) \ |
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| 230 | { \ |
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| 231 | register unsigned32 _tmpsr = 0; \ |
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| 232 | \ |
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| 233 | asm volatile( "movw %%sr,%0" \ |
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| 234 | : "=d" (_tmpsr) : "0" (_tmpsr) \ |
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| 235 | ); \ |
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| 236 | \ |
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| 237 | _tmpsr = (_tmpsr & 0xf8ff) | ((_newlevel) << 8); \ |
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| 238 | \ |
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| 239 | asm volatile( "movw %0,%%sr" \ |
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| 240 | : "=d" (_tmpsr) : "0" (_tmpsr) \ |
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| 241 | ); \ |
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| 242 | } |
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| 243 | |
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| 244 | #if ( M68K_HAS_VBR == 1 ) |
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| 245 | #define m68k_get_vbr( vbr ) \ |
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| 246 | { (vbr) = 0; \ |
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| 247 | asm volatile ( "movec %%vbr,%0 " \ |
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| 248 | : "=r" (vbr) : "0" (vbr) ); \ |
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| 249 | } |
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| 250 | |
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| 251 | #define m68k_set_vbr( vbr ) \ |
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| 252 | { register m68k_isr *_vbr= (m68k_isr *)(vbr); \ |
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| 253 | asm volatile ( "movec %0,%%vbr " \ |
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| 254 | : "=a" (_vbr) : "0" (_vbr) ); \ |
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| 255 | } |
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| 256 | #else |
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[38ffa0c] | 257 | #define m68k_get_vbr( _vbr ) _vbr = (void *)_VBR |
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[ac7d5ef0] | 258 | #define m68k_set_vbr( _vbr ) |
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| 259 | #endif |
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| 260 | |
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| 261 | /* |
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| 262 | * The following routine swaps the endian format of an unsigned int. |
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| 263 | * It must be static because it is referenced indirectly. |
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| 264 | */ |
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| 265 | |
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| 266 | static inline unsigned int m68k_swap_u32( |
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| 267 | unsigned int value |
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| 268 | ) |
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| 269 | { |
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| 270 | unsigned int swapped = value; |
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| 271 | |
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| 272 | asm volatile( "rorw #8,%0" : "=d" (swapped) : "0" (swapped) ); |
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| 273 | asm volatile( "swap %0" : "=d" (swapped) : "0" (swapped) ); |
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| 274 | asm volatile( "rorw #8,%0" : "=d" (swapped) : "0" (swapped) ); |
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| 275 | |
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| 276 | return( swapped ); |
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| 277 | } |
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| 278 | |
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| 279 | /* XXX this is only valid for some m68k family members and should be fixed */ |
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| 280 | |
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| 281 | #define m68k_enable_caching() \ |
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| 282 | { register unsigned32 _ctl=0x01; \ |
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| 283 | asm volatile ( "movec %0,%%cacr" \ |
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| 284 | : "=d" (_ctl) : "0" (_ctl) ); \ |
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| 285 | } |
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| 286 | |
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| 287 | #define CPU_swap_u32( value ) m68k_swap_u32( value ) |
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| 288 | |
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| 289 | #ifdef __cplusplus |
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| 290 | } |
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| 291 | #endif |
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| 292 | |
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| 293 | #endif /* !ASM */ |
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| 294 | |
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| 295 | #endif |
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| 296 | /* end of include file */ |
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