Mercurial > ecos
annotate packages/hal/common/current/src/hal_if.c @ 105:5a0cc6c243a9 ecos-sw-2000-06-30
Merge from eCos master repository on 2000-06-30-08:18:49-BST
| author | jlarmour |
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| date | Fri, 30 Jun 2000 16:27:35 +0000 |
| parents | 95f3e12a6327 |
| children | 7f461c3a372c |
| rev | line source |
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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 |
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56 #include <cyg/hal/hal_misc.h> // User break |
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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 |
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61 #include <cyg/hal/hal_intr.h> // hal_vsr_table and others |
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62 |
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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 |
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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 { |
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113 CYGARC_HAL_SAVE_GP(); |
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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 { |
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139 CYGARC_HAL_SAVE_GP(); |
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140 |
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141 reset(); |
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142 |
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143 CYGARC_HAL_RESTORE_GP(); |
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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 |
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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 |
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161 static int |
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162 set_debug_comm(int __comm_id) |
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163 { |
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164 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY; |
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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(); |
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169 |
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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, |
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172 "Invalid channel"); |
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173 |
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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) |
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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; |
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183 |
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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; |
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187 break; |
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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; |
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191 update = 1; |
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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 |
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196 update = 1; |
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197 break; |
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198 } |
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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) |
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204 interrupt_state = CYGACC_COMM_IF_CONTROL(*__chan)(CYGACC_COMM_IF_CH_DATA(*__chan), __COMMCTL_IRQ_DISABLE); |
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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]); |
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208 |
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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) |
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212 CYGACC_COMM_IF_CONTROL(*__chan)(CYGACC_COMM_IF_CH_DATA(*__chan), __COMMCTL_IRQ_ENABLE); |
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213 else |
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214 CYGACC_COMM_IF_CONTROL(*__chan)(CYGACC_COMM_IF_CH_DATA(*__chan), __COMMCTL_IRQ_DISABLE); |
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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; |
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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 { |
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224 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY; |
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225 int res = 1, update = 0; |
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226 CYGARC_HAL_SAVE_GP(); |
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227 |
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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, |
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230 "Invalid channel"); |
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231 |
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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) |
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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; |
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241 |
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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; |
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245 break; |
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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; |
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249 update = 1; |
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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 |
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254 update = 1; |
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255 break; |
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256 } |
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257 |
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258 if (update) { |
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259 __selected_id = __comm_id; |
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260 |
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261 CYGACC_CALL_IF_CONSOLE_PROCS_SET(comm_channels[__comm_id]); |
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262 } |
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263 |
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264 CYGARC_HAL_RESTORE_GP(); |
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265 return res; |
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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 { |
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274 CYGARC_HAL_SAVE_GP(); |
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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 |
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280 CYGARC_HAL_RESTORE_GP(); |
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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 { |
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286 CYGARC_HAL_SAVE_GP(); |
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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 |
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292 CYGARC_HAL_RESTORE_GP(); |
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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). |
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306 void |
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307 hal_if_diag_init(void) |
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308 { |
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309 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES |
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310 cyg_hal_plf_comms_init(); |
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311 #endif |
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312 |
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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. |
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316 if (CYGACC_CALL_IF_SET_DEBUG_COMM()(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT) |
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317 != CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL) |
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318 |
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319 CYGACC_CALL_IF_SET_CONSOLE_COMM()(CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL); |
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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) |
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328 CYGACC_COMM_IF_PUTC(*__chan)(CYGACC_COMM_IF_CH_DATA(*__chan), c); |
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329 else { |
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330 __chan = CYGACC_CALL_IF_DEBUG_PROCS(); |
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331 CYGACC_COMM_IF_PUTC(*__chan)(CYGACC_COMM_IF_CH_DATA(*__chan), c); |
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332 } |
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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 } |
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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)(CYGACC_COMM_IF_CH_DATA(*__chan)); |
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348 else { |
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349 __chan = CYGACC_CALL_IF_DEBUG_PROCS(); |
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350 *c = CYGACC_COMM_IF_GETC(*__chan)(CYGACC_COMM_IF_CH_DATA(*__chan)); |
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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 |
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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 |
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374 CYGACC_COMM_IF_CONTROL(*__chan)(CYGACC_COMM_IF_CH_DATA(*__chan), |
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375 __COMMCTL_IRQ_ENABLE); |
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376 } |
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377 |
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378 cyg_uint32 |
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379 hal_ctrlc_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data) |
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380 { |
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381 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS(); |
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382 int isr_ret, ctrlc = 0; |
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383 |
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384 isr_ret = CYGACC_COMM_IF_DBG_ISR(*__chan)(CYGACC_COMM_IF_CH_DATA(*__chan), |
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385 &ctrlc, vector, data); |
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386 if (ctrlc) |
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387 cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state ); |
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388 return isr_ret; |
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389 } |
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390 #endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT || CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT |
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391 |
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392 //-------------------------------------------------------------------------- |
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393 // Init function. It should be called from the platform initialization code. |
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394 // For monitor configurations it will initialize the calling interface table, |
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395 // for client configurations it will patch the existing table as per |
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396 // configuration. |
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397 void |
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398 hal_if_init(void) |
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399 { |
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400 // Set up services provided by monitors |
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401 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES |
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402 { |
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403 int i, j; |
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404 // Initialize tables with the NOP service. |
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405 // This should only be done for service routine entries - data |
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406 // pointers should be NULLed. |
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407 for (i = 0; i < CYGNUM_CALL_IF_TABLE_SIZE; i++) |
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408 hal_virtual_vector_table[i] = (CYG_ADDRWORD) &nop_service; |
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409 |
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410 for (j = 0; j < CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS+1; j++) |
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411 for (i = 0; i < CYGNUM_COMM_IF_TABLE_SIZE; i++) |
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412 comm_channels[j][i] = (CYG_ADDRWORD) &nop_service; |
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413 |
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414 |
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415 // Fill in supported services. |
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416 |
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417 // Version number |
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418 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION); |
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419 |
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420 // ICTRL and EXC tables - I assume these to be the equivalents of |
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421 // ISR and VSR tables. |
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422 CYGACC_CALL_IF_ICTRL_TABLE_SET(hal_interrupt_handlers); |
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423 CYGACC_CALL_IF_EXC_TABLE_SET(hal_vsr_table); |
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424 |
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425 // Miscellaneous services with wrappers in this file. |
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426 CYGACC_CALL_IF_RESET_SET(reset); |
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427 CYGACC_CALL_IF_KILL_VECTOR_SET(kill_by_reset); |
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428 CYGACC_CALL_IF_DELAY_US_SET(delay_us); |
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429 |
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430 // Comm controls |
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431 CYGACC_CALL_IF_SET_DEBUG_COMM_SET(set_debug_comm); |
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432 CYGACC_CALL_IF_SET_CONSOLE_COMM_SET(set_console_comm); |
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433 |
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434 // Cache functions |
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435 CYGACC_CALL_IF_FLUSH_ICACHE_SET(flush_icache); |
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436 CYGACC_CALL_IF_FLUSH_DCACHE_SET(flush_dcache); |
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437 |
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438 // Clear debug and console procs entries. If platform has been |
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439 // configured to use a separate console port, it will be set |
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440 // up later (hal_diag_init). Alternatively (if this is a stub) |
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441 // it will be initialized with the output mangler |
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442 // (O-packetizer for GDB) which uses the debug comms. |
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443 set_debug_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY); |
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444 set_console_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY); |
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445 |
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446 // Data entries not currently supported in eCos |
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447 CYGACC_CALL_IF_CPU_DATA_SET(0); |
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448 CYGACC_CALL_IF_BOARD_DATA_SET(0); |
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449 CYGACC_CALL_IF_DBG_DATA_SET(0); |
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450 } |
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451 #endif |
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452 |
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453 // Reset console interrupt flag. |
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454 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0); |
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455 |
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456 // Set up services provided by clients |
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457 #if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \ |
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458 ( defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs) \ |
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459 || defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon)) |
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460 |
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461 patch_dbg_syscalls( (void *)(hal_virtual_vector_table) ); |
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462 #endif |
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463 |
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464 // Init client services |
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465 #if !defined(CYGPKG_KERNEL) && defined(CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT) |
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466 // Only include this code if we do not have a kernel. Otherwise |
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467 // the kernel supplies the functionality for the app we are linked |
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468 // with. |
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469 |
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470 // Prepare for application installation of thread info function in |
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471 // vector table. |
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472 init_thread_syscall( (void *)&hal_virtual_vector_table[CYGNUM_CALL_IF_DBG_SYSCALL] ); |
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473 #endif |
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474 |
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475 // Finally, install async breakpoint handler if it is configured in. |
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476 // FIXME: this should probably check for STUBS instead (but code is |
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477 // conditional on BREAK for now) |
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478 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT) |
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479 // Install async breakpoint handler into vector table. |
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480 CYGACC_CALL_IF_INSTALL_BPT_FN_SET(&cyg_hal_gdb_interrupt); |
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481 #endif |
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482 } |
