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annotate packages/hal/powerpc/arch/current/src/hal_misc.c @ 420:d35f86833a7c

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Fix copyright.
author gthomas
date Wed, 13 Nov 2002 21:18:16 +0000
parents 047f0d36832a
children e0a4e3b20d73
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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 Red Hat, Inc.
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12 // Copyright (C) 2002 Gary Thomas
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13 //
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14 // eCos is free software; you can redistribute it and/or modify it under
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15 // the terms of the GNU General Public License as published by the Free
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16 // Software Foundation; either version 2 or (at your option) any later version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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19 // 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 along
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24 // with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use macros
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28 // or inline functions from this file, or you compile this file and link it
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29 // with other works to produce a work based on this file, this file does not
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30 // by itself cause the resulting work to be covered by the GNU General Public
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31 // License. However the source code for this file must still be made available
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32 // in accordance with section (3) of the GNU General Public License.
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33 //
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34 // This exception does not invalidate any other reasons why a work based on
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35 // this file might be covered by the GNU General Public License.
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36 //
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37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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38 // at http://sources.redhat.com/ecos/ecos-license/
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39 // -------------------------------------------
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40 //####ECOSGPLCOPYRIGHTEND####
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41 //==========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): nickg, jskov
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45 // Contributors: nickg, jskov,
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46 // jlarmour, gthomas
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47 // Date: 1999-02-20
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48 // Purpose: HAL miscellaneous functions
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49 // Description: This file contains miscellaneous functions provided by the
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50 // HAL.
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51 //
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52 //####DESCRIPTIONEND####
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53 //
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54 //===========================================================================
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55
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56 #include <pkgconf/hal.h>
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57
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58 #define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS
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59 #include <cyg/hal/ppc_regs.h> // SPR definitions
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60
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61 #include <cyg/infra/cyg_type.h>
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62 #include <cyg/infra/cyg_trac.h> // tracing macros
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63 #include <cyg/infra/cyg_ass.h> // assertion macros
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64 #include <cyg/infra/diag.h> // diag_printf
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65
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66 #include <cyg/hal/hal_arch.h> // HAL header
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67 #include <cyg/hal/hal_cache.h> // HAL cache
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68 #if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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69 defined(CYGPKG_HAL_EXCEPTIONS)
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70 # include <cyg/hal/hal_intr.h> // HAL interrupts/exceptions
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71 #endif
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72 #include <cyg/hal/hal_mem.h> // HAL memory handling
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74 //---------------------------------------------------------------------------
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75 // Functions used during initialization.
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76
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77 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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78 cyg_bool cyg_hal_stop_constructors;
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79 #endif
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80
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81 typedef void (*pfunc) (void);
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82 extern pfunc __CTOR_LIST__[];
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83 extern pfunc __CTOR_END__[];
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84
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85 void
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86 cyg_hal_invoke_constructors (void)
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87 {
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88 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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89 static pfunc *p = &__CTOR_END__[-1];
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90
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91 cyg_hal_stop_constructors = 0;
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92 for (; p >= __CTOR_LIST__; p--) {
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93 (*p) ();
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94 if (cyg_hal_stop_constructors) {
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95 p--;
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96 break;
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97 }
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98 }
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99 #else
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100 pfunc *p;
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101
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102 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
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103 (*p) ();
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104 #endif
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105 }
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106
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107 // Override any __eabi the compiler might generate. We don't want
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108 // constructors to be called twice.
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109 void __eabi (void) {}
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110
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111 //---------------------------------------------------------------------------
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112 // First level C exception handler.
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113
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114 externC void __handle_exception (void);
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115
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116 externC HAL_SavedRegisters *_hal_registers;
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117
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118 externC void* volatile __mem_fault_handler;
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119
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120 void
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121 cyg_hal_exception_handler(HAL_SavedRegisters *regs)
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122 {
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123 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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124
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125 // If we caught an exception inside the stubs, see if we were expecting it
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126 // and if so jump to the saved address
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127 if (__mem_fault_handler) {
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128 regs->pc = (CYG_ADDRWORD)__mem_fault_handler;
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129 return; // Caught an exception inside stubs
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130 }
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131
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132 // Set the pointer to the registers of the current exception
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133 // context. At entry the GDB stub will expand the
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134 // HAL_SavedRegisters structure into a (bigger) register array.
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135 _hal_registers = regs;
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136
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137 __handle_exception();
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138
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139 #ifdef CYGPKG_HAL_QUICC
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140 {
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141 // This is unpleasant: it appears that if we interrupt the board
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142 // using ^C coming in on the QUICC's SMC1, by planting a breakpoint
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143 // at the interrupt return address, the decrementer interrupt is
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144 // not taken when the bp exception returns AND WORSE no other
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145 // interrupt is possible until the decrementer fires again. This
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146 // does not apply to simple "incoming character" interrupts; it
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147 // seems it has to be combined with an immediate trap on RTI for
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148 // this to occur.
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149 //
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150 // The solution is to test for decrementer underflow after the
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151 // (any) exception, and maybe reinitialize the decrementer. If the
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152 // decrementer interrupt gets taken, that causes decrementer reinit
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153 // too, and no harm is done.
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154
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155 cyg_uint32 result;
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156 asm volatile(
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157 "mfdec %0;"
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158 : "=r"(result)
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159 );
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160
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161 if ( CYGNUM_HAL_RTC_PERIOD < result ) {
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162 // then we missed a tick, but the exception masked it
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163 // reset the decrementer here
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164 asm volatile(
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165 "mtdec %0;"
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166 : : "r"(CYGNUM_HAL_RTC_PERIOD)
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167 );
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168 }
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169 }
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170 #endif
18
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171
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172 #elif defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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173 defined(CYGPKG_HAL_EXCEPTIONS)
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174 int vector = regs->vector>>8;
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175
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176 // We should decode the vector and pass a more appropriate
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177 // value as the second argument. For now we simply pass a
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178 // pointer to the saved registers. We should also divert
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179 // breakpoint and other debug vectors into the debug stubs.
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180
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181 if (vector==CYGNUM_HAL_VECTOR_PROGRAM) {
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182 int srr1;
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183 CYGARC_MFSPR(CYGARC_REG_SRR1, srr1); // get srr1
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184
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185 switch ((srr1 >> 17) & 0xf) {
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186 case 1:
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187 vector = CYGNUM_HAL_EXCEPTION_TRAP;
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188 break;
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189 case 2:
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190 vector = CYGNUM_HAL_EXCEPTION_PRIVILEGED_INSTRUCTION;
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191 break;
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192 case 4:
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193 vector = CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION;
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194 break;
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195 case 8:
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196 vector = CYGNUM_HAL_EXCEPTION_FPU;
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197 break;
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198 default:
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199 CYG_FAIL("Unknown PROGRAM exception!!");
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200 }
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201 }
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202 cyg_hal_deliver_exception( vector, (CYG_ADDRWORD)regs );
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203
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204 #else
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205
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206 CYG_FAIL("Exception!!!");
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207
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208 #endif
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209
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210 return;
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211 }
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212
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213 //---------------------------------------------------------------------------
14
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214 // Default ISRs
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215
101
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216 #ifndef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT
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217 externC cyg_uint32
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218 hal_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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219 {
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220 diag_printf("Interrupt: %d\n", vector);
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221
0
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222 CYG_FAIL("Spurious Interrupt!!!");
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223 return 0;
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224 }
101
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225 #else
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226 externC cyg_uint32
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227 hal_arch_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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228 {
196
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229 return 0;
101
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230 }
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231 #endif
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232
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233 // The decrementer default ISR has to do nothing. The reason is that
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234 // decrementer interrupts cannot be disabled - if a kernel configuration
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235 // does not use the RTC, but does use external interrupts, the decrementer
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236 // underflow could cause a CYG_FAIL (as above) even though the user did
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237 // not expect any decrementer interrupts to happen.
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238 externC cyg_uint32
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239 hal_default_decrementer_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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240 {
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241 return 0;
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242 }
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243
0
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244 //---------------------------------------------------------------------------
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245 // Idle thread action
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246
82
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247 externC bool hal_variant_idle_thread_action(cyg_uint32);
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248
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249 void
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250 hal_idle_thread_action( cyg_uint32 count )
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251 {
82
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252 // Execute variant idle thread action, while allowing it to control
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253 // whether to run any of the architecture action code.
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254 if (!hal_variant_idle_thread_action(count))
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255 return;
32
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256
82
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257 #if 0
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258 do {
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259 register cyg_uint32 dec;
32
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260
82
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261 asm volatile(
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262 "mfdec %0;"
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263 : "=r"(dec)
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264 );
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265 diag_printf( "Decrementer %08x\n", dec);
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266 } while (0);
32
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267 #endif
0
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268 }
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269
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270 //---------------------------------------------------------------------------
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271 // Use MMU resources to map memory regions.
72
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272 // This relies that the platform HAL providing an
16
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273 // externC cyg_memdesc_t cyg_hal_mem_map[];
72
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274 // as detailed in hal_cache.h, and the variant HAL providing the
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275 // MMU mapping/clear functions.
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276 externC void
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277 hal_MMU_init (void)
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278 {
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279 int id = 0;
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280 int i = 0;
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281
72
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282 cyg_hal_clear_MMU ();
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283
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284 while (cyg_hal_mem_map[i].size) {
72
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285 id = cyg_hal_map_memory (id,
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286 cyg_hal_mem_map[i].virtual_addr,
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287 cyg_hal_mem_map[i].physical_addr,
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288 cyg_hal_mem_map[i].size,
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289 cyg_hal_mem_map[i].flags);
2
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290 i++;
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291 }
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292 }
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293
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294 //---------------------------------------------------------------------------
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295 // Initial cache enabling
64
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296 // Specific behavior for each platform configured via plf_cache.h
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297
2
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298 externC void
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299 hal_enable_caches(void)
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300 {
208
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301 #ifndef CYG_HAL_STARTUP_RAM
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302 // Invalidate caches
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303 HAL_DCACHE_INVALIDATE_ALL();
208
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304 HAL_ICACHE_INVALIDATE_ALL();
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305 #endif
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306
208
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307 #ifdef CYGSEM_HAL_ENABLE_ICACHE_ON_STARTUP
419
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308 #ifdef HAL_ICACHE_UNLOCK_ALL
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309 HAL_ICACHE_UNLOCK_ALL();
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310 #endif
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311 HAL_ICACHE_ENABLE();
208
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312 #endif
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313
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314 #ifdef CYGSEM_HAL_ENABLE_DCACHE_ON_STARTUP
419
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315 #ifdef HAL_DCACHE_UNLOCK_ALL
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316 HAL_DCACHE_UNLOCK_ALL();
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317 #endif
2
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318 HAL_DCACHE_ENABLE();
419
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319 #ifdef HAL_DCACHE_WRITE_MODE
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320 #ifdef CYGSEM_HAL_DCACHE_STARTUP_MODE_COPYBACK
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321 HAL_DCACHE_WRITE_MODE(HAL_DCACHE_WRITEBACK_MODE);
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322 #else
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323 HAL_DCACHE_WRITE_MODE(HAL_DCACHE_WRITETHRU_MODE);
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324 #endif
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325 #endif
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326 #endif
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327 }
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328
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329 //---------------------------------------------------------------------------
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330 //A jump via a null pointer causes the CPU to end up here.
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331 externC void
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332 hal_null_call(void)
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333 {
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334
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335 CYG_FAIL("Call via NULL-pointer!");
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336 for(;;);
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337 }
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338
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339 //---------------------------------------------------------------------------
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340 // End of hal_misc.c