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annotate packages/hal/sh/arch/current/src/hal_misc.c @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 // ####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, 2003 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): jskov
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43 // Contributors: jskov, jlarmour, nickg
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44 // Date: 1999-04-03
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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>
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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 #include <cyg/infra/diag.h> // diag_printf
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59
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60 #include <cyg/hal/hal_arch.h> // HAL header
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61 #include <cyg/hal/hal_cache.h> // HAL cache
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62 #include <cyg/hal/hal_intr.h> // HAL interrupts/exceptions
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64 #include <cyg/hal/sh_regs.h> // timer registers
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65
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66 //---------------------------------------------------------------------------
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67 // Functions used during initialization.
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68
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69 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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70 cyg_bool cyg_hal_stop_constructors;
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71 #endif
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72
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73 typedef void (*pfunc) (void);
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74 extern pfunc __CTOR_LIST__[];
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75 extern pfunc __CTOR_END__[];
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76
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77 void
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78 cyg_hal_invoke_constructors (void)
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79 {
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80 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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81 static pfunc *p = &__CTOR_END__[-1];
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82
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83 cyg_hal_stop_constructors = 0;
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84 for (; p >= __CTOR_LIST__; p--) {
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85 (*p) ();
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86 if (cyg_hal_stop_constructors) {
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87 p--;
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88 break;
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89 }
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90 }
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91 #else
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92 pfunc *p;
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93
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94 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
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95 (*p) ();
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96 #endif
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97 }
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98
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99 //---------------------------------------------------------------------------
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100 // First level C exception handler.
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101
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102 externC void __handle_exception (void);
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103
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104 externC HAL_SavedRegisters *_hal_registers;
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105 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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106 externC void* volatile __mem_fault_handler;
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107 #endif
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108
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109 void
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110 cyg_hal_exception_handler(HAL_SavedRegisters *regs)
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111 {
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112 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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113 if (__mem_fault_handler &&
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114 ((regs->event >= _CYGNUM_HAL_VECTOR_FIRST_MEM_FAULT) &&
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115 (regs->event <= _CYGNUM_HAL_VECTOR_LAST_MEM_FAULT))) {
112
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116 regs->pc = (unsigned long)__mem_fault_handler;
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117 return; // Caught an exception inside stubs
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118 }
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119
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120 // Set the pointer to the registers of the current exception
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121 // context. At entry the GDB stub will expand the
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122 // HAL_SavedRegisters structure into a (bigger) register array.
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123 _hal_registers = regs;
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124
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125 __handle_exception();
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126
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127 #elif defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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128 defined(CYGPKG_HAL_EXCEPTIONS)
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130 cyg_hal_deliver_exception( regs->event, (CYG_ADDRWORD)regs );
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131
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132 #else
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133
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134 CYG_FAIL("Exception!!!");
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135
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136 #endif
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137
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138 return;
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139 }
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140
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141 //---------------------------------------------------------------------------
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142 // Default ISR
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143 externC cyg_uint32
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144 hal_arch_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
76
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145 {
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146 return 0;
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147 }
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148
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149 //--------------------------------------------------------------------------
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150 // Determine the index of the ls bit of the supplied mask.
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151
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152 cyg_uint32
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153 hal_lsbit_index(cyg_uint32 mask)
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154 {
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155 cyg_uint32 n = mask;
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156
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157 static const signed char tab[64] =
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158 { -1, 0, 1, 12, 2, 6, 0, 13, 3, 0, 7, 0, 0, 0, 0, 14, 10,
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159 4, 0, 0, 8, 0, 0, 25, 0, 0, 0, 0, 0, 21, 27 , 15, 31, 11,
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160 5, 0, 0, 0, 0, 0, 9, 0, 0, 24, 0, 0 , 20, 26, 30, 0, 0, 0,
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161 0, 23, 0, 19, 29, 0, 22, 18, 28, 17, 16, 0
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162 };
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163
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164 n &= ~(n-1UL);
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165 n = (n<<16)-n;
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166 n = (n<<6)+n;
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167 n = (n<<4)+n;
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168
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169 return tab[n>>26];
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170 }
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171
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172 //--------------------------------------------------------------------------
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173 // Determine the index of the ms bit of the supplied mask.
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174
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175 cyg_uint32
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176 hal_msbit_index(cyg_uint32 mask)
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177 {
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178 cyg_uint32 x = mask;
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179 cyg_uint32 w;
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180
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181 // Phase 1: make word with all ones from that one to the right
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182 x |= x >> 16;
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183 x |= x >> 8;
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184 x |= x >> 4;
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185 x |= x >> 2;
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186 x |= x >> 1;
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187
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188 // Phase 2: calculate number of "1" bits in the word
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189 w = (x & 0x55555555) + ((x >> 1) & 0x55555555);
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190 w = (w & 0x33333333) + ((w >> 2) & 0x33333333);
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191 w = w + (w >> 4);
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192 w = (w & 0x000F000F) + ((w >> 8) & 0x000F000F);
196
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193 return (cyg_uint32)((w + (w >> 16)) & 0xFF) - 1;
76
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194
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195 }
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196
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197 //---------------------------------------------------------------------------
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198 // Idle thread action
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199
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200 void
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201 hal_idle_thread_action( cyg_uint32 count )
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202 {
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203 }
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204
208
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205 #ifdef CYGHWR_SH_RTC_TIMER_IS_TMU
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206 //---------------------------------------------------------------------------
112
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207 // Low-level delay (in microseconds)
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208
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209 void
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210 hal_delay_us(int usecs)
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211 {
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212 unsigned char _tstr; // Current clock control
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213 volatile unsigned char *tstr = (volatile unsigned char *)CYGARC_REG_TSTR;
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214 volatile unsigned long *tcnt = (volatile unsigned long *)CYGARC_REG_TCNT1;
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215 volatile unsigned long *tcor = (volatile unsigned long *)CYGARC_REG_TCOR1;
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216 volatile unsigned short *tcr = (volatile unsigned short *)CYGARC_REG_TCR1;
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217 unsigned long clocks_per_us = (((CYGHWR_HAL_SH_ONCHIP_PERIPHERAL_SPEED/1000000) +
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218 (CYGHWR_HAL_SH_TMU_PRESCALE_0-1)) /
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219 CYGHWR_HAL_SH_TMU_PRESCALE_0);
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220 volatile int diff, diff2;
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221 volatile cyg_uint32 val1, val2;
112
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222
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223 *tcr = (( 4==CYGHWR_HAL_SH_TMU_PRESCALE_0) ? CYGARC_REG_TCR_TPSC_4 :
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224 (16==CYGHWR_HAL_SH_TMU_PRESCALE_0) ? CYGARC_REG_TCR_TPSC_16:
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225 (64==CYGHWR_HAL_SH_TMU_PRESCALE_0) ? CYGARC_REG_TCR_TPSC_64:
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226 CYGARC_REG_TCR_TPSC_256);
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227
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228 *tcnt = 0x0FFFFFFF;
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229 *tcor = 0x0FFFFFFF;
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230
112
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231 _tstr = *tstr;
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232 *tstr |= CYGARC_REG_TSTR_STR1; // Enable channel 1
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233 while (usecs-- > 0) {
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234 diff = 0;
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235 val1 = *tcnt;
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236 while (diff < clocks_per_us) {
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237 while ((val2 = *tcnt) == val1) ;
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238 diff2 = val1 - val2;
112
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239 if (diff2 < 0) diff2 += *tcor;
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240 diff += diff2;
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241 val1 = val2;
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242 }
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243 }
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244 *tstr = _tstr; // Restore timer to previous state
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245 }
208
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246 #endif
112
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247
105
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248 //---------------------------------------------------------------------------
76
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249 // End of hal_misc.c