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annotate packages/hal/sh/arch/current/src/hal_misc.c @ 112:02ea4320376c ecos-sw-2000-07-21

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Merge from eCos master repository on 2000-07-21-21:01:39-BST
author jlarmour
date Fri, 21 Jul 2000 21:34:11 +0000
parents 5a0cc6c243a9
children 518f42066aba
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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 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, jlarmour, nickg
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36 // Date: 1999-04-03
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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
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45 #include <pkgconf/hal.h>
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46
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47 #include <cyg/infra/cyg_type.h>
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48 #include <cyg/infra/cyg_trac.h> // tracing macros
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49 #include <cyg/infra/cyg_ass.h> // assertion macros
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50 #include <cyg/infra/diag.h> // diag_printf
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51
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52 #include <cyg/hal/hal_arch.h> // HAL header
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53 #include <cyg/hal/hal_cache.h> // HAL cache
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54 #if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS) || \
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55 defined(CYGPKG_HAL_EXCEPTIONS)
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56 # include <cyg/hal/hal_intr.h> // HAL interrupts/exceptions
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57 #endif
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58
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59 //---------------------------------------------------------------------------
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60 // Functions used during initialization.
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61
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62 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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63 cyg_bool cyg_hal_stop_constructors;
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64 #endif
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65
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66 typedef void (*pfunc) (void);
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67 extern pfunc __CTOR_LIST__[];
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68 extern pfunc __CTOR_END__[];
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69
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70 void
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71 cyg_hal_invoke_constructors (void)
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72 {
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73 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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74 static pfunc *p = &__CTOR_END__[-1];
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75
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76 cyg_hal_stop_constructors = 0;
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77 for (; p >= __CTOR_LIST__; p--) {
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78 (*p) ();
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79 if (cyg_hal_stop_constructors) {
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80 p--;
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81 break;
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82 }
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83 }
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84 #else
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85 pfunc *p;
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86
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87 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
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88 (*p) ();
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89 #endif
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90 }
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91
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92 //---------------------------------------------------------------------------
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93 // First level C exception handler.
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94
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95 externC void __handle_exception (void);
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96
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97 externC HAL_SavedRegisters *_hal_registers;
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98 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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99 externC volatile void *__mem_fault_handler;
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100 #endif
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101
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102 void
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103 cyg_hal_exception_handler(HAL_SavedRegisters *regs)
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104 {
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105 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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106 if (__mem_fault_handler &&
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107 ((regs->event >= CYGNUM_HAL_EXCEPTION_TLBMISS_ACCESS) &&
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108 (regs->event <= CYGNUM_HAL_EXCEPTION_DATA_WRITE))) {
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109 regs->pc = (unsigned long)__mem_fault_handler;
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110 return; // Caught an exception inside stubs
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111 }
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112
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113 // Set the pointer to the registers of the current exception
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114 // context. At entry the GDB stub will expand the
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115 // HAL_SavedRegisters structure into a (bigger) register array.
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116 _hal_registers = regs;
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117
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118 __handle_exception();
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119
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120 #elif defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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121 defined(CYGPKG_HAL_EXCEPTIONS)
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122
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123 cyg_hal_deliver_exception( regs->event, (CYG_ADDRWORD)regs );
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124
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125 #else
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126
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127 CYG_FAIL("Exception!!!");
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128
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129 #endif
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130
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131 return;
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132 }
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133
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134 //---------------------------------------------------------------------------
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135 // Default ISR
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136 externC cyg_uint32
105
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137 hal_arch_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
76
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138 {
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139 return 0;
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140 }
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141
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142 //--------------------------------------------------------------------------
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143 // Determine the index of the ls bit of the supplied mask.
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144
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145 cyg_uint32
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146 hal_lsbit_index(cyg_uint32 mask)
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147 {
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148 cyg_uint32 n = mask;
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149
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150 static const signed char tab[64] =
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151 { -1, 0, 1, 12, 2, 6, 0, 13, 3, 0, 7, 0, 0, 0, 0, 14, 10,
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152 4, 0, 0, 8, 0, 0, 25, 0, 0, 0, 0, 0, 21, 27 , 15, 31, 11,
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153 5, 0, 0, 0, 0, 0, 9, 0, 0, 24, 0, 0 , 20, 26, 30, 0, 0, 0,
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154 0, 23, 0, 19, 29, 0, 22, 18, 28, 17, 16, 0
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155 };
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156
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157 n &= ~(n-1UL);
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158 n = (n<<16)-n;
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159 n = (n<<6)+n;
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160 n = (n<<4)+n;
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161
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162 return tab[n>>26];
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163 }
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164
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165 //--------------------------------------------------------------------------
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166 // Determine the index of the ms bit of the supplied mask.
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167
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168 cyg_uint32
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169 hal_msbit_index(cyg_uint32 mask)
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170 {
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171 cyg_uint32 x = mask;
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172 cyg_uint32 w;
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173
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174 // Phase 1: make word with all ones from that one to the right
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175 x |= x >> 16;
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176 x |= x >> 8;
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177 x |= x >> 4;
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178 x |= x >> 2;
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179 x |= x >> 1;
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180
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181 // Phase 2: calculate number of "1" bits in the word
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182 w = (x & 0x55555555) + ((x >> 1) & 0x55555555);
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183 w = (w & 0x33333333) + ((w >> 2) & 0x33333333);
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184 w = w + (w >> 4);
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185 w = (w & 0x000F000F) + ((w >> 8) & 0x000F000F);
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186 return (cyg_uint32)((w + (w >> 16)) & 0xFF);
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187
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188 }
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189
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190 //---------------------------------------------------------------------------
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191 // Idle thread action
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192
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193 void
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194 hal_idle_thread_action( cyg_uint32 count )
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195 {
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196 }
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197
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198 //---------------------------------------------------------------------------
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199 // Initial cache enabling
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200 externC void
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201 cyg_hal_enable_caches(void)
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202 {
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203 // Initialize cache.
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204 HAL_UCACHE_INVALIDATE_ALL();
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205
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206 // Enable writeback.
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207 HAL_UCACHE_WRITE_MODE(HAL_UCACHE_WRITEBACK_MODE);
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208
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209 // Enable cache.
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210 HAL_UCACHE_ENABLE();
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211 }
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212
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213 //---------------------------------------------------------------------------
105
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214 // SH3 variant stuff
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215 // This should be split out...
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216 void
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217 hal_variant_init(void)
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218 {
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219 }
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220
112
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221 // Low-level delay (in microseconds)
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222
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223 void
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224 hal_delay_us(int usecs)
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225 {
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226 unsigned char _tstr; // Current clock control
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227 volatile unsigned char *tstr = (volatile unsigned char *)CYGARC_REG_TSTR;
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228 volatile unsigned long *tcnt = (volatile unsigned long *)CYGARC_REG_TCNT1;
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229 volatile unsigned long *tcor = (volatile unsigned long *)CYGARC_REG_TCOR1;
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230 unsigned long clocks_per_us = (CYGHWR_HAL_SH_BOARD_SPEED+(4-1))/4; // Rounded up
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231 int diff, diff2;
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232 cyg_uint32 val1, val2;
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233
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234 _tstr = *tstr;
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235 *tstr |= CYGARC_REG_TSTR_STR1; // Enable channel 1
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236 while (usecs-- > 0) {
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237 diff = 0;
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238 while (diff < clocks_per_us) {
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239 val1 = *tcnt;
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240 while ((val2 = *tcnt) == val1) ;
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241 diff2 = val2 - val1;
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242 if (diff2 < 0) diff2 += *tcor;
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243 diff += diff2;
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244 }
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245 }
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246 *tstr = _tstr; // Restore timer to previous state
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247 }
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248
105
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249 //---------------------------------------------------------------------------
76
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250 // End of hal_misc.c