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annotate packages/hal/common/current/src/hal_if.c @ 107:7f461c3a372c

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Merge from eCos master repository on 2000-07-04-08:04:30-BST
author jlarmour
date Tue, 04 Jul 2000 07:34:17 +0000
parents 5a0cc6c243a9
children 84e4bde58b26
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1 //=============================================================================
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2 //
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3 // hal_if.c
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4 //
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5 // ROM/RAM interfacing 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
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36 // Date: 2000-06-07
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37 //
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38 //####DESCRIPTIONEND####
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39 //
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40 //=============================================================================
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41
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42 #include <pkgconf/hal.h>
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43
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44 #ifdef CYGPKG_KERNEL
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45 # include <pkgconf/kernel.h>
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46 #endif
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47
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48 #include <cyg/infra/cyg_ass.h> // assertions
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49
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50 #include <cyg/hal/hal_arch.h> // set/restore GP
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51
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52 #include <cyg/hal/hal_io.h> // IO macros
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53 #include <cyg/hal/hal_if.h> // our interface
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54
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55 #include <cyg/hal/hal_diag.h> // Diag IO
105
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56 #include <cyg/hal/hal_misc.h> // User break
101
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57
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58 #include <cyg/hal/hal_stub.h> // stub functionality
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59 #include <cyg/hal/plf_stub.h> // reset entry - FIXME, should be moved
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60
105
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61 #include <cyg/hal/hal_intr.h> // hal_vsr_table and others
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62
101
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63
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64 //--------------------------------------------------------------------------
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65
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66 externC void patch_dbg_syscalls(void * vector);
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67 externC void init_thread_syscall(void * vector);
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68
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69 //--------------------------------------------------------------------------
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70 // Implementations and function wrappers for monitor services
105
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71
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72 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
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73 static void
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74 delay_us(cyg_int32 usecs)
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75 {
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76 #ifdef CYGPKG_KERNEL
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77 cyg_int32 start, elapsed;
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78 cyg_int32 usec_ticks, slice;
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79 CYGARC_HAL_SAVE_GP();
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80
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81 // How many ticks total we should wait for.
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82 usec_ticks = usecs*CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;
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83 usec_ticks /= CYGNUM_HAL_RTC_NUMERATOR/CYGNUM_HAL_RTC_DENOMINATOR/1000;
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84
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85 do {
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86 // Spin in slices of 1/2 the RTC period. Allows interrupts
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87 // time to run without messing up the algorithm. If we spun
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88 // for 1 period (or more) of the RTC, there'd be also problems
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89 // figuring out when the timer wrapped. We may lose a tick or
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90 // two for each cycle but it shouldn't matter much.
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91 slice = usec_ticks % (CYGNUM_KERNEL_COUNTERS_RTC_PERIOD / 2);
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92
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93 HAL_CLOCK_READ(&start);
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94 do {
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95 HAL_CLOCK_READ(&elapsed);
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96 elapsed = (elapsed - start); // counts up!
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97 if (elapsed < 0)
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98 elapsed += CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;
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99 } while (elapsed < slice);
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100
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101 // Adjust by elapsed, not slice, since an interrupt may have
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102 // been stalling us for some time.
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103 usec_ticks -= elapsed;
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104 } while (usec_ticks > 0);
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105
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106 CYGARC_HAL_RESTORE_GP();
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107 #endif
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108 }
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109
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110 static void
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111 reset(void)
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112 {
105
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113 CYGARC_HAL_SAVE_GP();
101
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114 // With luck, the platform defines some magic that will cause a hardware
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115 // reset.
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116 HAL_STUB_PLATFORM_RESET();
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117
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118 #ifdef HAL_STUB_PLATFORM_RESET_ENTRY
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119 // If that's not the case (above is an empty statement) there may
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120 // be defined an address we can jump to - and effectively
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121 // reinitialize the system. Not quite as good as a reset, but it
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122 // is often enough.
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123 goto *HAL_STUB_PLATFORM_RESET_ENTRY;
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124
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125 #else
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126 #error " no RESET_ENTRY"
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127 #endif
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128
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129 CYGARC_HAL_RESTORE_GP();
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130 }
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131
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132 // This is the system's default kill signal routine. Unless overridden
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133 // by the application, it will cause a board reset when GDB quits the
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134 // connection. (The user can avoid the reset by using the GDB 'detach'
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135 // command instead of 'kill' or 'quit').
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136 static int
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137 kill_by_reset(int __irq_nr, void* __regs)
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138 {
105
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139 CYGARC_HAL_SAVE_GP();
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140
101
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141 reset();
105
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142
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143 CYGARC_HAL_RESTORE_GP();
101
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144 return 0;
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145 }
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146
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147 static int
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148 nop_service(void)
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149 {
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150 // This is the default service. It always returns false (0), and
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151 // _does_ not trigger any assertions. Clients must either cope
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152 // with the service failure or assert.
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153 return 0;
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154 }
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155
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156 //----------------------------------
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157 // Comm controls
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158
103
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159 static hal_virtual_comm_table_t comm_channels[CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS+1];
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160
101
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161 static int
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162 set_debug_comm(int __comm_id)
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163 {
103
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164 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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165 hal_virtual_comm_table_t* __chan;
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166 int interrupt_state = 0;
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167 int res = 1, update = 0;
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168 CYGARC_HAL_SAVE_GP();
101
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169
103
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170 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
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171 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS,
101
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172 "Invalid channel");
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173
103
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174 switch (__comm_id) {
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175 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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176 if (__selected_id > 0)
105
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177 res = __selected_id-1;
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178 else if (__selected_id == 0)
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179 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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180 else
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181 res = __selected_id;
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182 break;
101
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183
103
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184 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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185 CYGACC_CALL_IF_DEBUG_PROCS_SET(0);
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186 __selected_id = __comm_id;
105
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187 break;
103
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188
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189 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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190 __comm_id = 0;
105
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191 update = 1;
103
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192 break;
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193
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194 default:
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195 __comm_id++; // skip mangler entry
105
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196 update = 1;
103
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197 break;
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198 }
105
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199
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200 if (update) {
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201 // Find the interrupt state of the channel.
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202 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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203 if (__chan)
107
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204 interrupt_state = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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205
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206 __selected_id = __comm_id;
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207 CYGACC_CALL_IF_DEBUG_PROCS_SET(comm_channels[__comm_id]);
101
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208
105
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209 // Set interrupt state on the new channel.
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210 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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211 if (interrupt_state)
107
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212 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
105
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213 else
107
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214 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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215 }
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216
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217 CYGARC_HAL_RESTORE_GP();
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218 return res;
101
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219 }
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220
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221 static int
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222 set_console_comm(int __comm_id)
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223 {
103
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224 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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225 int res = 1, update = 0;
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226 CYGARC_HAL_SAVE_GP();
101
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227
103
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228 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
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229 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS,
101
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230 "Invalid channel");
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231
103
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232 switch (__comm_id) {
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233 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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234 if (__selected_id > 0)
105
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235 res = __selected_id-1;
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236 else if (__selected_id == 0)
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237 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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238 else
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239 res = __selected_id;
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240 break;
101
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241
103
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242 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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243 CYGACC_CALL_IF_CONSOLE_PROCS_SET(0);
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244 __selected_id = __comm_id;
105
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245 break;
103
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246
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247 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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248 __comm_id = 0;
105
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249 update = 1;
103
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250 break;
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251
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252 default:
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253 __comm_id++; // skip mangler entry
105
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254 update = 1;
103
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255 break;
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256 }
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257
105
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258 if (update) {
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259 __selected_id = __comm_id;
101
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260
105
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261 CYGACC_CALL_IF_CONSOLE_PROCS_SET(comm_channels[__comm_id]);
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262 }
101
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263
105
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264 CYGARC_HAL_RESTORE_GP();
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265 return res;
101
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266 }
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267
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268 //----------------------------------
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269 // Cache functions
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270
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271 static void
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272 flush_icache(void *__p, int __nbytes)
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273 {
105
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274 CYGARC_HAL_SAVE_GP();
101
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275 #ifdef HAL_ICACHE_FLUSH
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276 HAL_ICACHE_FLUSH( __p , __nbytes );
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277 #elif defined(HAL_ICACHE_INVALIDATE)
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278 HAL_ICACHE_INVALIDATE();
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279 #endif
105
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280 CYGARC_HAL_RESTORE_GP();
101
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281 }
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282
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283 static void
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284 flush_dcache(void *__p, int __nbytes)
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285 {
105
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286 CYGARC_HAL_SAVE_GP();
101
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287 #ifdef HAL_DCACHE_FLUSH
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288 HAL_DCACHE_FLUSH( __p , __nbytes );
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289 #elif defined(HAL_DCACHE_INVALIDATE)
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290 HAL_DCACHE_INVALIDATE();
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291 #endif
105
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292 CYGARC_HAL_RESTORE_GP();
101
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293 }
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294
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295 #endif
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296
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297 #if defined(CYGSEM_HAL_VIRTUAL_VECTOR_DIAG)
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298 //-----------------------------------------------------------------------------
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299 // Console IO functions that adhere to the virtual vector table semantics in
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300 // order to ensure proper debug agent mangling when required.
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301 //
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302 // The platform HAL must specify the channel used, and provide raw IO
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303 // routines for that channel. The platform HAL also has the necessary
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304 // information to determine if the channel is already initialized by
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305 // a debug agent (either builtin or in ROM).
105
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306 void
101
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307 hal_if_diag_init(void)
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308 {
105
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309 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
103
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310 cyg_hal_plf_comms_init();
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311 #endif
101
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312
103
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313 // Set console channel. This should only be done when the console channel
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314 // differs from the debug channel to prevent removing the debug agent's
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315 // mangler procs.
107
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316 if (CYGACC_CALL_IF_SET_DEBUG_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT)
103
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317 != CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL)
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318
107
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319 CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL);
101
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320 }
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321
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322 void
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323 hal_if_diag_write_char(char c)
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324 {
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325 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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326
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327 if (__chan)
107
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328 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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329 else {
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330 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
107
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331 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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332 }
105
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333
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334 // Check interrupt flag
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335 if (CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG()) {
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336 cyg_hal_user_break(0);
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337 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
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338 }
101
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339 }
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340
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341 void
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342 hal_if_diag_read_char(char *c)
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343 {
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344 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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345
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346 if (__chan)
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347 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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348 else {
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349 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
107
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350 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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351 }
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352 }
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353 #endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG
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354
105
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355 //=============================================================================
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356 // CtrlC support
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357 //=============================================================================
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358
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359 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT) \
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360 || defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT)
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361
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362 struct Hal_SavedRegisters *hal_saved_interrupt_state;
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363
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364 void
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365 hal_ctrlc_isr_init(void)
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366 {
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367 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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368
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369 #if 1 // Prevents crash on older stubs
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370 if (CYGNUM_CALL_IF_TABLE_VERSION != CYGACC_CALL_IF_VERSION())
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371 return;
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372 #endif
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373
107
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374 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
105
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375 }
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376
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377 cyg_uint32
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378 hal_ctrlc_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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379 {
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380 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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381 int isr_ret, ctrlc = 0;
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382
107
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383 isr_ret = CYGACC_COMM_IF_DBG_ISR(*__chan, &ctrlc, vector, data);
105
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384 if (ctrlc)
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385 cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state );
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386 return isr_ret;
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387 }
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388 #endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT || CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT
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389
101
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390 //--------------------------------------------------------------------------
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391 // Init function. It should be called from the platform initialization code.
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392 // For monitor configurations it will initialize the calling interface table,
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393 // for client configurations it will patch the existing table as per
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394 // configuration.
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395 void
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396 hal_if_init(void)
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397 {
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398 // Set up services provided by monitors
103
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399 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
101
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400 {
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401 int i, j;
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402 // Initialize tables with the NOP service.
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403 // This should only be done for service routine entries - data
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404 // pointers should be NULLed.
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405 for (i = 0; i < CYGNUM_CALL_IF_TABLE_SIZE; i++)
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406 hal_virtual_vector_table[i] = (CYG_ADDRWORD) &nop_service;
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407
103
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408 for (j = 0; j < CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS+1; j++)
101
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409 for (i = 0; i < CYGNUM_COMM_IF_TABLE_SIZE; i++)
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410 comm_channels[j][i] = (CYG_ADDRWORD) &nop_service;
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411
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412
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413 // Fill in supported services.
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414
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415 // Version number
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416 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION);
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417
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418 // ICTRL and EXC tables - I assume these to be the equivalents of
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419 // ISR and VSR tables.
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420 CYGACC_CALL_IF_ICTRL_TABLE_SET(hal_interrupt_handlers);
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421 CYGACC_CALL_IF_EXC_TABLE_SET(hal_vsr_table);
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422
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423 // Miscellaneous services with wrappers in this file.
101
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424 CYGACC_CALL_IF_RESET_SET(reset);
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425 CYGACC_CALL_IF_KILL_VECTOR_SET(kill_by_reset);
105
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426 CYGACC_CALL_IF_DELAY_US_SET(delay_us);
101
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427
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428 // Comm controls
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429 CYGACC_CALL_IF_SET_DEBUG_COMM_SET(set_debug_comm);
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430 CYGACC_CALL_IF_SET_CONSOLE_COMM_SET(set_console_comm);
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431
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432 // Cache functions
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433 CYGACC_CALL_IF_FLUSH_ICACHE_SET(flush_icache);
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434 CYGACC_CALL_IF_FLUSH_DCACHE_SET(flush_dcache);
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435
105
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436 // Clear debug and console procs entries. If platform has been
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437 // configured to use a separate console port, it will be set
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438 // up later (hal_diag_init). Alternatively (if this is a stub)
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439 // it will be initialized with the output mangler
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440 // (O-packetizer for GDB) which uses the debug comms.
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441 set_debug_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
103
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442 set_console_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
101
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443
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444 // Data entries not currently supported in eCos
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445 CYGACC_CALL_IF_CPU_DATA_SET(0);
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446 CYGACC_CALL_IF_BOARD_DATA_SET(0);
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447 CYGACC_CALL_IF_DBG_DATA_SET(0);
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448 }
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449 #endif
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450
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451 // Reset console interrupt flag.
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452 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
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453
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454 // Set up services provided by clients
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455 #if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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456 ( defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs) \
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457 || defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon))
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458
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459 patch_dbg_syscalls( (void *)(hal_virtual_vector_table) );
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460 #endif
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461
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462 // Init client services
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463 #if !defined(CYGPKG_KERNEL) && defined(CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT)
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464 // Only include this code if we do not have a kernel. Otherwise
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465 // the kernel supplies the functionality for the app we are linked
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466 // with.
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467
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468 // Prepare for application installation of thread info function in
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469 // vector table.
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470 init_thread_syscall( (void *)&hal_virtual_vector_table[CYGNUM_CALL_IF_DBG_SYSCALL] );
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471 #endif
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472
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473 // Finally, install async breakpoint handler if it is configured in.
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474 // FIXME: this should probably check for STUBS instead (but code is
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475 // conditional on BREAK for now)
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476 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
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477 // Install async breakpoint handler into vector table.
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478 CYGACC_CALL_IF_INSTALL_BPT_FN_SET(&cyg_hal_gdb_interrupt);
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479 #endif
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480 }