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annotate packages/hal/powerpc/ppc60x/current/src/var_misc.c @ 82:6736c52df507 ecos-sw-2000-04-14

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Merge from eCos master repository on 2000-04-14-13:35:46-BST
author jlarmour
date Tue, 18 Apr 2000 21:51:55 +0000
parents da3908c9cd10
children e0c0827131d1
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1 //==========================================================================
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2 //
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3 // var_misc.c
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4 //
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5 // HAL implementation miscellaneous functions
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jskov
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35 // Contributors: jskov
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36 // Date: 2000-02-04
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37 // Purpose: HAL miscellaneous functions
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38 // Description: This file contains miscellaneous functions provided by the
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39 // HAL.
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //==========================================================================
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44
72
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45 #include <pkgconf/hal.h>
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46
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47 #define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS
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48 #include <cyg/hal/ppc_regs.h>
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49 #include <cyg/infra/cyg_type.h>
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50
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51 #include <cyg/hal/hal_mem.h>
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52
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53 //--------------------------------------------------------------------------
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54 void hal_variant_init(void)
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55 {
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56 }
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57
82
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58
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59 //--------------------------------------------------------------------------
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60 // Variant specific idle thread action.
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61 bool
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62 hal_variant_idle_thread_action( cyg_uint32 count )
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63 {
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64 // Let architecture idle thread action run
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65 return true;
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66 }
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67
72
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68 //---------------------------------------------------------------------------
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69 // Use MMU resources to map memory regions.
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70 // Takes and returns an int used to ID the MMU resource to use. This ID
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71 // is increased as resources are used and should be used for subsequent
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72 // invocations.
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73 int
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74 cyg_hal_map_memory (int id,CYG_ADDRESS virt, CYG_ADDRESS phys,
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75 cyg_int32 size, cyg_uint8 flags)
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76 {
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77 // Use BATs to map the memory.
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78 cyg_uint32 ubat, lbat;
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79
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80 ubat = (virt & UBAT_BEPIMASK) | UBAT_VS | UBAT_VP;
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81 lbat = (phys & LBAT_BRPNMASK);
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82 if (flags & CYGARC_MEMDESC_CI)
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83 lbat |= LBAT_I;
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84 if (flags & CYGARC_MEMDESC_GUARDED)
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85 lbat |= LBAT_G;
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86
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87 // There are 4 BATs, size is programmable.
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88 while (id < 4 && size > 0) {
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89 cyg_uint32 blk_size = 128*1024;
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90 cyg_uint32 bl = 0;
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91 while (blk_size < 256*1024*1024 && blk_size < size) {
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92 blk_size *= 2;
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93 bl = (bl << 1) | 1;
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94 }
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95 ubat = (ubat & ~UBAT_BLMASK) | (bl << 2);
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96
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97 switch (id) {
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98 case 0:
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99 CYGARC_MTSPR (IBAT0U, ubat);
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100 CYGARC_MTSPR (IBAT0L, lbat);
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101 CYGARC_MTSPR (DBAT0U, ubat);
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102 CYGARC_MTSPR (DBAT0L, lbat);
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103 break;
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104 case 1:
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105 CYGARC_MTSPR (IBAT1U, ubat);
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106 CYGARC_MTSPR (IBAT1L, lbat);
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107 CYGARC_MTSPR (DBAT1U, ubat);
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108 CYGARC_MTSPR (DBAT1L, lbat);
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109 break;
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110 case 2:
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111 CYGARC_MTSPR (IBAT2U, ubat);
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112 CYGARC_MTSPR (IBAT2L, lbat);
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113 CYGARC_MTSPR (DBAT2U, ubat);
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114 CYGARC_MTSPR (DBAT2L, lbat);
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115 break;
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116 case 3:
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117 CYGARC_MTSPR (IBAT3U, ubat);
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118 CYGARC_MTSPR (IBAT3L, lbat);
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119 CYGARC_MTSPR (DBAT3U, ubat);
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120 CYGARC_MTSPR (DBAT3L, lbat);
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121 break;
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122 }
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123
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124 size -= blk_size;
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125 id++;
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126 }
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127
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128 return id;
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129 }
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130
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131
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132 // Initialize MMU to a sane (NOP) state.
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133 void
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134 cyg_hal_clear_MMU (void)
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135 {
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136 cyg_uint32 ubat, lbat;
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137
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138 // Initialize BATs with 0 -- VS&VP are unset, making all matches fail
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139 ubat = 0;
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140 lbat = 0;
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141
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142 CYGARC_MTSPR (IBAT0U, ubat);
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143 CYGARC_MTSPR (IBAT0L, lbat);
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144 CYGARC_MTSPR (DBAT0U, ubat);
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145 CYGARC_MTSPR (DBAT0L, lbat);
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146 CYGARC_MTSPR (IBAT1U, ubat);
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147 CYGARC_MTSPR (IBAT1L, lbat);
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148 CYGARC_MTSPR (DBAT1U, ubat);
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149 CYGARC_MTSPR (DBAT1L, lbat);
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150 CYGARC_MTSPR (IBAT2U, ubat);
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151 CYGARC_MTSPR (IBAT2L, lbat);
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152 CYGARC_MTSPR (DBAT2U, ubat);
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153 CYGARC_MTSPR (DBAT2L, lbat);
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154 CYGARC_MTSPR (IBAT3U, ubat);
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155 CYGARC_MTSPR (IBAT3L, lbat);
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156 CYGARC_MTSPR (DBAT3U, ubat);
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157 CYGARC_MTSPR (DBAT3L, lbat);
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158 }
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159
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160 //--------------------------------------------------------------------------
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161 // End of var_misc.c