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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
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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 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, gthomas
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43 // Contributors: nickg, gthomas
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44 // Date: 1999-02-20
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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 #include <pkgconf/hal_frv.h>
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55 #ifdef CYGPKG_KERNEL
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56 #include <pkgconf/kernel.h>
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57 #endif
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58 #ifdef CYGPKG_CYGMON
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59 #include <pkgconf/cygmon.h>
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60 #endif
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61
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62 #include <cyg/infra/cyg_type.h>
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63 #include <cyg/infra/cyg_trac.h> // tracing macros
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64 #include <cyg/infra/cyg_ass.h> // assertion macros
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65 #include <cyg/infra/diag.h>
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66
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67 #include <cyg/hal/hal_arch.h> // HAL header
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68 #include <cyg/hal/hal_intr.h> // HAL header
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69 #include <cyg/hal/hal_cache.h> // HAL header
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70
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71 /*------------------------------------------------------------------------*/
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72 /* First level C exception handler. */
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73
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74 externC void __handle_exception (void);
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75
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76 externC HAL_SavedRegisters *_hal_registers;
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77 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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78 // Historical - this datum is defined by the GDB stubs if present
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79 externC
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80 #endif
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81 void* volatile __mem_fault_handler;
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82
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83 #if 0
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84 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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85 /* Force exception handling into the GDB stubs. This is done by taking over
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86 the exception vectors while executing in the stubs. This allows for the
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87 debugged program to handle exceptions itself, except while the GDB
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88 processing is underway. The only vector that can't be handled this way
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89 is the illegal instruction vector which is used for breakpoint/single-step
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90 and must be maintained by the stubs at all times.
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91 Note: the interrupt vectors are _not_ preempted as the stubs probably can't
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92 handle them properly.
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93 */
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94
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95 #define ARM_VECTORS 8
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96 extern unsigned long vectors[]; // exception vectors as defined by the stubs
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97
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98 #if !defined(CYGPKG_CYGMON)
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99 static unsigned long *hardware_vectors = (unsigned long *)0x20;
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100 static unsigned long hold_vectors[ARM_VECTORS];
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101 static int exception_level;
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102
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103 static void
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104 __take_over_debug_traps(void)
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105 {
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106 hold_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH] = hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH];
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107 hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH] = vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH];
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108 hold_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA] = hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA];
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109 hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA] = vectors[CYGNUM_HAL_VECTOR_ABORT_DATA];
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110 }
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111
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112 static void
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113 __restore_debug_traps(void)
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114 {
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115 hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH] = hold_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH];
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116 hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA] = hold_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA];
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117 }
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118 #endif // !CYGPKG_CYGMON
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119 #endif
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120
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121 #endif // if 0
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122
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123 void
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124 exception_handler(HAL_SavedRegisters *regs)
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125 {
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126 // Special case handler for code which has chosen to take care
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127 // of data exceptions (i.e. code which expects them to happen)
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128 // This is common in discovery code, e.g. checking for a particular
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129 // device which may generate an exception when probing if the
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130 // device is not present
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131 if (__mem_fault_handler &&
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132 regs->vector == CYGNUM_HAL_EXCEPTION_DATA_ACCESS) {
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133 regs->pc = (unsigned long)__mem_fault_handler;
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134 return; // Caught an exception inside stubs
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135 }
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136
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137 #if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS) && !defined(CYGPKG_CYGMON)
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138 //?? if (++exception_level == 1) __take_over_debug_traps();
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139
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140 _hal_registers = regs;
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141 __handle_exception();
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142
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143 //?? if (--exception_level == 0) __restore_debug_traps();
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144
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145 #elif defined(CYGPKG_KERNEL_EXCEPTIONS)
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146
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147 // We should decode the vector and pass a more appropriate
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148 // value as the second argument. For now we simply pass a
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149 // pointer to the saved registers. We should also divert
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150 // breakpoint and other debug vectors into the debug stubs.
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151
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152 cyg_hal_deliver_exception( regs->vector, (CYG_ADDRWORD)regs );
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153
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154 #else
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155
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156 CYG_FAIL("Exception!!!");
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157
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158 #endif
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159
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160 return;
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161 }
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162
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163 void hal_spurious_IRQ(HAL_SavedRegisters *regs) CYGBLD_ATTRIB_WEAK;
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164 void
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165 hal_spurious_IRQ(HAL_SavedRegisters *regs)
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166 {
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167 #if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
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168 exception_handler(regs);
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169 #else
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170 CYG_FAIL("Spurious interrupt!!");
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171 #endif
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172 }
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173
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174 /*------------------------------------------------------------------------*/
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175 /* C++ support - run initial constructors */
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176
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177 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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178 cyg_bool cyg_hal_stop_constructors;
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179 #endif
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180
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181 typedef void (*pfunc) (void);
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182 extern pfunc __CTOR_LIST__[];
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183 extern pfunc __CTOR_END__[];
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184
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185 void
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186 cyg_hal_invoke_constructors (void)
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187 {
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188 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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189 static pfunc *p = &__CTOR_END__[-1];
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190
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191 cyg_hal_stop_constructors = 0;
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192 for (; p >= __CTOR_LIST__; p--) {
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193 (*p) ();
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194 if (cyg_hal_stop_constructors) {
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195 p--;
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196 break;
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197 }
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198 }
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199 #else
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200 pfunc *p;
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201
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202 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--) {
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203 (*p) ();
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204 }
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205 #endif
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206 }
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207
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208 /*------------------------------------------------------------------------*/
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209 /* Architecture default ISR */
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210
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211 externC cyg_uint32
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212 hal_arch_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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213 {
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214 CYG_TRACE1(true, "Interrupt: %d", vector);
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215
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216 CYG_FAIL("Spurious Interrupt!!!");
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217 return 0;
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218 }
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219
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220 /*------------------------------------------------------------------------*/
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221 /* Idle thread action */
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222
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223 void
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224 hal_idle_thread_action( cyg_uint32 count )
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225 {
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226 }
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227
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228 /*-------------------------------------------------------------------------*/
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229 /* Misc functions */
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230
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231 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS__
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232 /* This function will generate a breakpoint exception. It is used at the
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233 beginning of a program to sync up with a debugger and can be used
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234 otherwise as a quick means to stop program execution and "break" into
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235 the debugger. */
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236
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237 void
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238 breakpoint(void)
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239 {
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240 HAL_BREAKPOINT(_breakinst);
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241 }
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242
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243
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244 /* This function returns the opcode for a 'trap' instruction. */
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245
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246 unsigned long
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247 __break_opcode (void)
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248 {
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249 return HAL_BREAKINST;
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250 }
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251 #endif
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252
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253 int
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254 hal_lsbindex(int mask)
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255 {
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256 int i;
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257 for (i = 0; i < 32; i++) {
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258 if (mask & (1<<i)) return (i);
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259 }
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260 return (-1);
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261 }
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262
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263 int
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264 hal_msbindex(int mask)
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265 {
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266 int i;
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267 for (i = 31; i >= 0; i--) {
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268 if (mask & (1<<i)) return (i);
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269 }
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270 return (-1);
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271 }
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272
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273 /*------------------------------------------------------------------------*/
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274 // EOF hal_misc.c