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annotate packages/hal/powerpc/ppc60x/current/src/var_misc.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 6736c52df507
children d2c90368aeef
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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 //==========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
70
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jskov
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44 // Contributors: jskov
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45 // Date: 2000-02-04
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46 // Purpose: HAL miscellaneous functions
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47 // Description: This file contains miscellaneous functions provided by the
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48 // HAL.
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
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54 #include <pkgconf/hal.h>
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55
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56 #define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS
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57 #include <cyg/hal/ppc_regs.h>
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58 #include <cyg/infra/cyg_type.h>
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59
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60 #include <cyg/hal/hal_mem.h>
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61
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62 //--------------------------------------------------------------------------
70
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63 void hal_variant_init(void)
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64 {
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65 }
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66
82
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67
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68 //--------------------------------------------------------------------------
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69 // Variant specific idle thread action.
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70 bool
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71 hal_variant_idle_thread_action( cyg_uint32 count )
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72 {
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73 // Let architecture idle thread action run
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74 return true;
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75 }
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76
72
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77 //---------------------------------------------------------------------------
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78 // Use MMU resources to map memory regions.
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79 // Takes and returns an int used to ID the MMU resource to use. This ID
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80 // is increased as resources are used and should be used for subsequent
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81 // invocations.
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82 int
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83 cyg_hal_map_memory (int id,CYG_ADDRESS virt, CYG_ADDRESS phys,
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84 cyg_int32 size, cyg_uint8 flags)
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85 {
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86 // Use BATs to map the memory.
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87 cyg_uint32 ubat, lbat;
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88
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89 ubat = (virt & UBAT_BEPIMASK) | UBAT_VS | UBAT_VP;
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90 lbat = (phys & LBAT_BRPNMASK);
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91 if (flags & CYGARC_MEMDESC_CI)
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92 lbat |= LBAT_I;
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93 if (flags & CYGARC_MEMDESC_GUARDED)
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94 lbat |= LBAT_G;
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95
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96 // There are 4 BATs, size is programmable.
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97 while (id < 4 && size > 0) {
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98 cyg_uint32 blk_size = 128*1024;
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99 cyg_uint32 bl = 0;
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100 while (blk_size < 256*1024*1024 && blk_size < size) {
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101 blk_size *= 2;
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102 bl = (bl << 1) | 1;
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103 }
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104 ubat = (ubat & ~UBAT_BLMASK) | (bl << 2);
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105
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106 switch (id) {
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107 case 0:
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108 CYGARC_MTSPR (IBAT0U, ubat);
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109 CYGARC_MTSPR (IBAT0L, lbat);
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110 CYGARC_MTSPR (DBAT0U, ubat);
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111 CYGARC_MTSPR (DBAT0L, lbat);
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112 break;
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113 case 1:
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114 CYGARC_MTSPR (IBAT1U, ubat);
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115 CYGARC_MTSPR (IBAT1L, lbat);
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116 CYGARC_MTSPR (DBAT1U, ubat);
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117 CYGARC_MTSPR (DBAT1L, lbat);
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118 break;
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119 case 2:
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120 CYGARC_MTSPR (IBAT2U, ubat);
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121 CYGARC_MTSPR (IBAT2L, lbat);
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122 CYGARC_MTSPR (DBAT2U, ubat);
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123 CYGARC_MTSPR (DBAT2L, lbat);
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124 break;
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125 case 3:
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126 CYGARC_MTSPR (IBAT3U, ubat);
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127 CYGARC_MTSPR (IBAT3L, lbat);
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128 CYGARC_MTSPR (DBAT3U, ubat);
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129 CYGARC_MTSPR (DBAT3L, lbat);
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130 break;
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131 }
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132
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133 size -= blk_size;
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134 id++;
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135 }
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136
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137 return id;
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138 }
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139
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140
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141 // Initialize MMU to a sane (NOP) state.
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142 void
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143 cyg_hal_clear_MMU (void)
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144 {
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145 cyg_uint32 ubat, lbat;
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146
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147 // Initialize BATs with 0 -- VS&VP are unset, making all matches fail
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148 ubat = 0;
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149 lbat = 0;
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150
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151 CYGARC_MTSPR (IBAT0U, ubat);
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152 CYGARC_MTSPR (IBAT0L, lbat);
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153 CYGARC_MTSPR (DBAT0U, ubat);
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154 CYGARC_MTSPR (DBAT0L, lbat);
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155 CYGARC_MTSPR (IBAT1U, ubat);
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156 CYGARC_MTSPR (IBAT1L, lbat);
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157 CYGARC_MTSPR (DBAT1U, ubat);
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158 CYGARC_MTSPR (DBAT1L, lbat);
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159 CYGARC_MTSPR (IBAT2U, ubat);
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160 CYGARC_MTSPR (IBAT2L, lbat);
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161 CYGARC_MTSPR (DBAT2U, ubat);
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162 CYGARC_MTSPR (DBAT2L, lbat);
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163 CYGARC_MTSPR (IBAT3U, ubat);
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164 CYGARC_MTSPR (IBAT3L, lbat);
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165 CYGARC_MTSPR (DBAT3U, ubat);
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166 CYGARC_MTSPR (DBAT3L, lbat);
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167 }
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168
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169 //--------------------------------------------------------------------------
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170 // End of var_misc.c