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annotate packages/hal/mn10300/am31/current/src/var_misc.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents d2c90368aeef
children
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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 CPU variant miscellaneous functions
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6 //
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7 //==========================================================================
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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 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): nickg
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43 // Contributors: nickg, jlarmour
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44 // Date: 1999-01-21
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45 // Purpose: HAL miscellaneous functions
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46 // Description: This file contains miscellaneous functions provided by the
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47 // HAL.
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //========================================================================*/
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52
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53 #include <pkgconf/hal.h>
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54
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55 #include <cyg/infra/cyg_type.h> // Base types
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56 #include <cyg/infra/cyg_trac.h> // tracing macros
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57 #include <cyg/infra/cyg_ass.h> // assertion macros
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58
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59 #include <cyg/hal/hal_cache.h>
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60
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61 /*------------------------------------------------------------------------*/
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62 /* Variant specific initialization routine. */
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63
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64 void hal_variant_init(void)
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65 {
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66 }
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67
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68 /*------------------------------------------------------------------------*/
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69 /* Cache functions. */
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70
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71 #if !defined(CYG_HAL_MN10300_AM31_SIM)
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72 void cyg_hal_dcache_store(CYG_ADDRWORD base, int size)
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73 {
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74 #if 0
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75 volatile register CYG_BYTE *way0 = HAL_DCACHE_PURGE_WAY0;
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76 volatile register CYG_BYTE *way1 = HAL_DCACHE_PURGE_WAY1;
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77 register int i;
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78 register CYG_ADDRWORD state;
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79
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80 HAL_DCACHE_IS_ENABLED(state);
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81 if (state)
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82 HAL_DCACHE_DISABLE();
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83
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84 way0 += base & 0x000007f0;
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85 way1 += base & 0x000007f0;
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86 for( i = 0; i < size; i += HAL_DCACHE_LINE_SIZE )
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87 {
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88 *(CYG_ADDRWORD *)way0 = 0;
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89 *(CYG_ADDRWORD *)way1 = 0;
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90 way0 += HAL_DCACHE_LINE_SIZE;
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91 way1 += HAL_DCACHE_LINE_SIZE;
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92 }
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93 if (state)
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94 HAL_DCACHE_ENABLE();
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95 #else
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96
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97 // Despite several people trying to understand it, the above code
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98 // still does not work correctly. Whether this is a result of the
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99 // AM31 hardware being faulty, or simply a problem with register
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100 // pressure causing the values of some variables to be lost as a
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101 // result of the purge we are not sure. Similar code on the AM33
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102 // works perfectly, but that processor has more registers to play
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103 // with. The following code, taken from CygMon, works correctly,
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104 // and does not appear to exhibit the problems of the code above.
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105 // It's only drawback is that it purges the entire cache. However,
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106 // this is permitted under the definition of the cache macros, so
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107 // this is not a major concern at present.
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108
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109 __asm__ (
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110 ".equ CHCTR, 0x20000070;"
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111 ".equ CHCTR_ICEN, 0x0001;"
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112 ".equ CHCTR_DCEN, 0x0002;"
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113 ".equ CHCTR_ICBUSY, 0x0004;"
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114 ".equ CHCTR_DCBUSY, 0x0008;"
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115 ".equ CHCTR_ICINV, 0x0010;"
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116 ".equ CHCTR_DCINV, 0x0020;"
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117 ".equ DCACHE_PURGE_WAY0_START, 0x28400000;"
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118 ".equ DCACHE_PURGE_WAY0_END, 0x28400800;"
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119 ".equ DCACHE_PURGE_WAY1_START, 0x28401000;"
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120 ".equ DCACHE_PURGE_WAY1_END, 0x28401800;"
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121
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122 "mov CHCTR,a0;"
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123
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124 /* DCACHE */
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125
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126 /* first check if dcache enabled */
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127 "mov (a0),d0;"
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128 "btst CHCTR_DCEN,d0;"
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129 /* if not, jump to end */
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130 "beq 2f;"
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131
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132 /* if so, we have to disable the cache */
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133 "and 0xfffffffd,d0;"
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134 "mov d0,(a0);"
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135
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136 /* wait for it to stop being busy */
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137 "setlb;"
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138 "nop;"
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139 "mov (a0),d0;"
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140 "btst CHCTR_DCBUSY,d0;"
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141 "lne;"
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142
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143 /* now purge the dcache */
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144 "mov DCACHE_PURGE_WAY0_START,a1;"
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145 "1:"
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146 "mov (0,a1),d0;"
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147 "add 0x10,a1;"
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148 "cmp DCACHE_PURGE_WAY0_END,a1;"
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149 "bne 1b;"
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150 "mov DCACHE_PURGE_WAY1_START,a1;"
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151 "1:"
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152 "mov (0,a1),d0;"
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153 "add 0x10,a1;"
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154 "cmp DCACHE_PURGE_WAY1_END,a1;"
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155 "bne 1b;"
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156
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157 /* wait for it to stop being busy */
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158 "setlb;"
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159 "nop;"
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160 "mov (a0),d0;"
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161 "btst CHCTR_DCBUSY,d0;"
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162 "lne;"
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163
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164 /* and re-enable */
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165 "or CHCTR_DCEN,d0;"
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166 "mov d0,(a0);"
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167
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168 "2:"
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169
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170 :
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171 :
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172 : "a0", "a1", "d0"
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173 );
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174
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175 #endif
30
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176 }
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177 #endif
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178
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179
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180 /*------------------------------------------------------------------------*/
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181 /* End of var_misc.c */