annotate packages/hal/mips/arch/current/src/hal_misc.c @ 18:7253dcc42a09 ecos-sw-1999-06-25

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author jlarmour
date Fri, 25 Jun 1999 08:28:05 +0000
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children 4741a3c3496a
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1 //==========================================================================
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2 //
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3 // hal_misc.c
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4 //
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5 // HAL 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 Cygnus eCos Public License
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12 // Version 1.0 (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://sourceware.cygnus.com/ecos
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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 Cygnus Operating System, released
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22 // September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Cygnus. Portions created
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25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved.
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26 // -------------------------------------------
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27 //
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28 //####COPYRIGHTEND####
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29 //==========================================================================
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30 //#####DESCRIPTIONBEGIN####
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31 //
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32 // Author(s): nickg
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33 // Contributors: nickg, jlarmour
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34 // Date: 1999-01-21
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35 // Purpose: HAL miscellaneous functions
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36 // Description: This file contains miscellaneous functions provided by the
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37 // HAL.
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38 //
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39 //####DESCRIPTIONEND####
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40 //
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41 //========================================================================*/
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42
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43 #include <pkgconf/hal.h>
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44
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45 #include <cyg/infra/cyg_type.h> // Base types
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46 #include <cyg/infra/cyg_trac.h> // tracing macros
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47 #include <cyg/infra/cyg_ass.h> // assertion macros
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48
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49 #include <cyg/hal/hal_arch.h> // architectural definitions
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50
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51 #include <cyg/hal/hal_intr.h> // Interrupt handling
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52
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53 #include <cyg/hal/hal_cache.h> // Cache handling
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54
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55 /*------------------------------------------------------------------------*/
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56 /* If required, define a variable to store the clock period. */
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57
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58 #ifdef CYGHWR_HAL_CLOCK_PERIOD_DEFINED
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59
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60 CYG_WORD32 cyg_hal_clock_period;
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61
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62 #endif
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63
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64 /*------------------------------------------------------------------------*/
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65 /* First level C exception handler. */
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66
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67 externC void __handle_exception (void);
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68
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69 externC HAL_SavedRegisters *_hal_registers;
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70
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71 externC void exception_handler(HAL_SavedRegisters *regs)
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72 {
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73 #if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
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74
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75 // Set the pointer to the registers of the current exception
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76 // context. At entry the GDB stub will expand the
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77 // HAL_SavedRegisters structure into a (bigger) register array.
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78 _hal_registers = regs;
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79 __handle_exception();
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80
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81 #elif defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && defined(CYGPKG_HAL_EXCEPTIONS)
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82
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83 // We should decode the vector and pass a more appropriate
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84 // value as the second argument. For now we simply pass a
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85 // pointer to the saved registers. We should also divert
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86 // breakpoint and other debug vectors into the debug stubs.
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87
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88 cyg_hal_deliver_exception( regs->vector>>2, (CYG_ADDRWORD)regs );
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89
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90 #else
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91
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92 CYG_FAIL("Exception!!!");
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93
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94 #endif
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95 return;
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96 }
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97
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98 /*------------------------------------------------------------------------*/
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99 /* default ISR */
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100
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101 externC cyg_uint32 hal_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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102 {
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103 #if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT) && \
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104 defined(CYGHWR_HAL_GDB_PORT_VECTOR) && \
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105 defined(HAL_CTRLC_ISR)
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106
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107 #ifndef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN
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108 if( vector == CYGHWR_HAL_GDB_PORT_VECTOR )
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109 #endif
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110 {
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111 cyg_uint32 result = HAL_CTRLC_ISR( vector, data );
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112 if( result != 0 ) return result;
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113 }
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114
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115 #endif
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116
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117 CYG_TRACE1(true, "Interrupt: %d", vector);
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118 CYG_FAIL("Spurious Interrupt!!!");
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119 return 0;
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120 }
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121
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122 /*------------------------------------------------------------------------*/
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123 /* data copy and bss zero functions */
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124
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125 typedef void (CYG_SYM_ADDRESS)(void);
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126
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127 // All these must use this type of address to stop them being given relocations
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128 // relative to $gp (i.e. assuming they would be in .sdata)
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129 extern CYG_SYM_ADDRESS __ram_data_start;
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130 extern CYG_SYM_ADDRESS __ram_data_end;
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131 extern CYG_SYM_ADDRESS __rom_data_start;
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132
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133 #ifdef CYG_HAL_STARTUP_ROM
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134 void hal_copy_data(void)
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135 {
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136 char *p = (char *)&__ram_data_start;
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137 char *q = (char *)&__rom_data_start;
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138
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139 while( p != (char *)&__ram_data_end )
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140 *p++ = *q++;
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141 }
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142 #endif
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143
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144 extern CYG_SYM_ADDRESS __bss_start;
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145 extern CYG_SYM_ADDRESS __bss_end;
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146
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147 void hal_zero_bss(void)
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148 {
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149 char *p = (char *)&__bss_start;
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150
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151 while( p != (char *)&__bss_end )
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152 *p++ = 0;
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153 }
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154
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155 /*------------------------------------------------------------------------*/
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156
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157 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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158 cyg_bool cyg_hal_stop_constructors;
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159 #endif
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160
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161 typedef void (*pfunc) (void);
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162 extern pfunc __CTOR_LIST__[];
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163 extern pfunc __CTOR_END__[];
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164
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165 void
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166 cyg_hal_invoke_constructors(void)
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167 {
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168 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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169 static pfunc *p = &__CTOR_END__[-1];
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170
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171 cyg_hal_stop_constructors = 0;
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172 for (; p >= __CTOR_LIST__; p--) {
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173 (*p) ();
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174 if (cyg_hal_stop_constructors) {
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175 p--;
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176 break;
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177 }
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178 }
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179 #else
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180 pfunc *p;
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181
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182 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
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183 (*p) ();
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184 #endif
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185
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186 } // cyg_hal_invoke_constructors()
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187
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188 /*------------------------------------------------------------------------*/
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189 /* Determine the index of the ls bit of the supplied mask. */
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190
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191 cyg_uint32 hal_lsbit_index(cyg_uint32 mask)
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192 {
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193 cyg_uint32 n = mask;
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194
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195 static const signed char tab[64] =
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196 { -1, 0, 1, 12, 2, 6, 0, 13, 3, 0, 7, 0, 0, 0, 0, 14, 10,
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197 4, 0, 0, 8, 0, 0, 25, 0, 0, 0, 0, 0, 21, 27 , 15, 31, 11,
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198 5, 0, 0, 0, 0, 0, 9, 0, 0, 24, 0, 0 , 20, 26, 30, 0, 0, 0,
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199 0, 23, 0, 19, 29, 0, 22, 18, 28, 17, 16, 0
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200 };
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201
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202 n &= ~(n-1UL);
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203 n = (n<<16)-n;
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204 n = (n<<6)+n;
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205 n = (n<<4)+n;
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206
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207 return tab[n>>26];
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208 }
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209
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210 /*------------------------------------------------------------------------*/
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211 /* Determine the index of the ms bit of the supplied mask. */
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212
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213 cyg_uint32 hal_msbit_index(cyg_uint32 mask)
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214 {
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215 cyg_uint32 x = mask;
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216 cyg_uint32 w;
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217
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218 /* Phase 1: make word with all ones from that one to the right */
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219 x |= x >> 16;
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220 x |= x >> 8;
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221 x |= x >> 4;
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222 x |= x >> 2;
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223 x |= x >> 1;
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224
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225 /* Phase 2: calculate number of "1" bits in the word */
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226 w = (x & 0x55555555) + ((x >> 1) & 0x55555555);
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227 w = (w & 0x33333333) + ((w >> 2) & 0x33333333);
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228 w = w + (w >> 4);
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229 w = (w & 0x000F000F) + ((w >> 8) & 0x000F000F);
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230 return (cyg_uint32)((w + (w >> 16)) & 0xFF);
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231
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232 }
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233
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234 /*------------------------------------------------------------------------*/
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235 /* Idle thread action */
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236
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237 #include <cyg/infra/diag.h>
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238
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239 void hal_idle_thread_action( cyg_uint32 count )
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240 {
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241 #if 0 //def CYG_HAL_MIPS_SIM
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242 if( (count % 1000) == 0 )
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243 {
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244 // This code causes a fake interrupt.
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245 asm volatile (
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246 "xor $24,$24,$24;"
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247 "mtc0 $24,$13;"
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248 "lui $25,%%hi(1f);"
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249 "ori $25,$25,%%lo(1f);"
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250 "j other_vector;"
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251 "nop;"
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252 "1:"
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253 :
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254 :
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255 : "t8", "t9"
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256 );
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257 }
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258 #endif
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259 #if 0 //def CYG_HAL_MIPS_JMR3904
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260
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261 if( (count % 100000 ) == 0 )
0
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262 {
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263 // cyg_uint32 tval, isr, imr, ilr;
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264 cyg_uint32 sr = 0, cr = 0, ctr = 0, cpr = 0;
0
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265 // HAL_CLOCK_READ( &tval );
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266 // HAL_READ_UINT32( 0xFFFFC000, isr );
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267 // HAL_READ_UINT32( 0xFFFFC004, imr );
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268 // HAL_READ_UINT32( 0xFFFFC01C, ilr );
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269 // CYG_TRACE2(1, "Timer value, ISR ",tval, isr);
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270 // CYG_TRACE2(1, "IMR ILR0 ", imr, ilr);
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271
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272 // asm volatile (
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273 // "mfc0 %0,$12;"
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274 // "nop; nop; nop;"
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275 // "mfc0 %1,$13;"
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276 // "nop; nop; nop;"
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277 // "mfc0 %2,$9;"
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278 // "nop; nop; nop;"
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279 // "mfc0 %3,$11;"
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280 // "nop; nop; nop;"
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281 // : "=r"(sr), "=r"(cr), "=r"(ctr), "=r"(cpr)
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282 // );
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283
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284
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285 // diag_printf("Status %08x ", sr );
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286 // diag_printf("Cause %08x ", cr );
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287 // diag_printf("Counter %08x ", ctr );
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288 // diag_printf("Compare %08x\n", cpr);
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289
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290 #if 0
0
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291 asm volatile (
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292 "mfc0 %0,$12;"
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293 "nop; nop; nop;"
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294 : "=r"(sr)
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295 );
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296 diag_write_string("Status "); diag_write_hex( sr );
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297
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298 asm volatile (
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299 "mfc0 %0,$13;"
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300 "nop; nop; nop;"
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301 : "=r"(cr)
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302 );
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303 diag_write_string(" Cause "); diag_write_hex( cr );
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304
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305 asm volatile (
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306 "mfc0 %0,$9;"
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307 "nop; nop; nop;"
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308 : "=r"(ctr)
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309 );
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310 diag_write_string(" Counter "); diag_write_hex( ctr );
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311
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312 asm volatile (
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313 "mfc0 %0,$11;"
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314 "nop; nop; nop;"
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315 : "=r"(cpr)
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316 );
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317 diag_write_string(" Compare "); diag_write_hex( cpr );
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318 diag_write_string( "\n" );
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319
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320 #endif
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321 #if 1
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322 asm volatile (
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323 "mfc0 %0,$12;"
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324 "nop; nop; nop;"
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325 : "=r"(sr)
0
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326 );
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327
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328 asm volatile (
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329 "mfc0 %0,$13;"
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330 "nop; nop; nop;"
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331 : "=r"(cr)
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332 );
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333
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334 CYG_INSTRUMENT_USER( 1, sr, cr );
0
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335
6
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336 asm volatile (
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337 "mfc0 %0,$9;"
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338 "nop; nop; nop;"
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339 : "=r"(ctr)
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340 );
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341
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342 asm volatile (
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343 "mfc0 %0,$11;"
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344 "nop; nop; nop;"
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345 : "=r"(cpr)
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346 );
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347
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348 CYG_INSTRUMENT_USER( 2, ctr, cpr );
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349 #endif
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350
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351 // if( count == 4 )
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352 // {
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353 // HAL_ENABLE_INTERRUPTS();
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354 // }
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355
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356 // if( count >= 10 )
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357 // for(;;);
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358 }
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359 #endif
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360 }
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361
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362 /*------------------------------------------------------------------------*/
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363 /* End of hal_misc.c */