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annotate packages/hal/common/current/src/hal_if.c @ 136:a9ac27ec7abc ecos-sw-2000-11-17

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Merge from eCos master repository on 2000-11-17-18:24:25-GMT
author jlarmour
date Fri, 17 Nov 2000 23:16:43 +0000
parents 77cec8369160
children 6b5f480c6929
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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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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
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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 #else
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108 #ifdef HAL_DELAY_US
110
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109 // Use a HAL feature if defined
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110 HAL_DELAY_US(usecs);
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111 #else
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112 // If no accurate delay mechanism, just spin for a while. Having
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113 // an inaccurate delay is much better than no delay at all. The
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114 // count of 100 should mean the loop takes something resembling
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115 // 1us on most CPUs running between 30-100MHz [depends on how many
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116 // instructions this compiles to, how many dispatch units can be
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117 // used for the simple loop, actual CPU frequency, etc]
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118 while (usecs-- > 0) {
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119 int i;
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120 for (i = 0; i < 100; i++);
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121 }
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122 #endif
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123 #endif
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124 }
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125
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126 static void
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127 reset(void)
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128 {
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129 CYGARC_HAL_SAVE_GP();
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130 // With luck, the platform defines some magic that will cause a hardware
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131 // reset.
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132 HAL_STUB_PLATFORM_RESET();
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133
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134 #ifdef HAL_STUB_PLATFORM_RESET_ENTRY
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135 // If that's not the case (above is an empty statement) there may
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136 // be defined an address we can jump to - and effectively
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137 // reinitialize the system. Not quite as good as a reset, but it
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138 // is often enough.
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139 goto *HAL_STUB_PLATFORM_RESET_ENTRY;
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140
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141 #else
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142 #error " no RESET_ENTRY"
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143 #endif
105
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144
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145 CYGARC_HAL_RESTORE_GP();
101
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146 }
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147
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148 // This is the system's default kill signal routine. Unless overridden
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149 // by the application, it will cause a board reset when GDB quits the
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150 // connection. (The user can avoid the reset by using the GDB 'detach'
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151 // command instead of 'kill' or 'quit').
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152 static int
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153 kill_by_reset(int __irq_nr, void* __regs)
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154 {
105
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155 CYGARC_HAL_SAVE_GP();
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156
101
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157 reset();
105
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158
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159 CYGARC_HAL_RESTORE_GP();
101
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160 return 0;
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161 }
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162
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163 static int
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164 nop_service(void)
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165 {
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166 // This is the default service. It always returns false (0), and
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167 // _does_ not trigger any assertions. Clients must either cope
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168 // with the service failure or assert.
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169 return 0;
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170 }
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171
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172 //----------------------------------
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173 // Comm controls
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174
112
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175 #ifdef CYGNUM_HAL_VIRTUAL_VECTOR_AUX_CHANNELS
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176 #define CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS \
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177 (CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS+CYGNUM_HAL_VIRTUAL_VECTOR_AUX_CHANNELS)
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178 #else
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179 #define CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS \
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180 CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS
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181 #endif
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182
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183 static hal_virtual_comm_table_t comm_channels[CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS+1];
103
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184
101
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185 static int
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186 set_debug_comm(int __comm_id)
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187 {
103
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188 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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189 hal_virtual_comm_table_t* __chan;
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190 int interrupt_state = 0;
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191 int res = 1, update = 0;
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192 CYGARC_HAL_SAVE_GP();
101
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193
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194 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
112
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195 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS,
101
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196 "Invalid channel");
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197
103
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198 switch (__comm_id) {
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199 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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200 if (__selected_id > 0)
105
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201 res = __selected_id-1;
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202 else if (__selected_id == 0)
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203 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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204 else
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205 res = __selected_id;
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206 break;
101
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207
103
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208 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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209 CYGACC_CALL_IF_DEBUG_PROCS_SET(0);
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210 __selected_id = __comm_id;
105
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211 break;
103
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212
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213 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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214 __comm_id = 0;
105
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215 update = 1;
103
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216 break;
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217
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218 default:
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219 __comm_id++; // skip mangler entry
105
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220 update = 1;
103
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221 break;
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222 }
105
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223
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224 if (update) {
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225 // Find the interrupt state of the channel.
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226 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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227 if (__chan)
107
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228 interrupt_state = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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229
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230 __selected_id = __comm_id;
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231 CYGACC_CALL_IF_DEBUG_PROCS_SET(comm_channels[__comm_id]);
101
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232
105
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233 // Set interrupt state on the new channel.
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234 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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235 if (interrupt_state)
107
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236 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
105
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237 else
107
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238 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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239 }
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240
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241 CYGARC_HAL_RESTORE_GP();
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242 return res;
101
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243 }
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244
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245 static int
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246 set_console_comm(int __comm_id)
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247 {
103
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248 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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249 int res = 1, update = 0;
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250 CYGARC_HAL_SAVE_GP();
101
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251
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252 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
112
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253 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS,
101
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254 "Invalid channel");
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255
103
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256 switch (__comm_id) {
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257 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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258 if (__selected_id > 0)
105
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259 res = __selected_id-1;
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260 else if (__selected_id == 0)
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261 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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262 else
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263 res = __selected_id;
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264 break;
101
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265
103
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266 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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267 CYGACC_CALL_IF_CONSOLE_PROCS_SET(0);
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268 __selected_id = __comm_id;
105
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269 break;
103
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270
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271 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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272 __comm_id = 0;
105
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273 update = 1;
103
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274 break;
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275
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276 default:
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277 __comm_id++; // skip mangler entry
105
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278 update = 1;
103
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279 break;
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280 }
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281
105
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282 if (update) {
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283 __selected_id = __comm_id;
101
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284
105
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285 CYGACC_CALL_IF_CONSOLE_PROCS_SET(comm_channels[__comm_id]);
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286 }
101
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287
105
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288 CYGARC_HAL_RESTORE_GP();
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289 return res;
101
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290 }
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291
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292 //----------------------------------
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293 // Cache functions
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294
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295 static void
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296 flush_icache(void *__p, int __nbytes)
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297 {
105
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298 CYGARC_HAL_SAVE_GP();
101
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299 #ifdef HAL_ICACHE_FLUSH
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300 HAL_ICACHE_FLUSH( __p , __nbytes );
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301 #elif defined(HAL_ICACHE_INVALIDATE)
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302 HAL_ICACHE_INVALIDATE();
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303 #endif
105
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304 CYGARC_HAL_RESTORE_GP();
101
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305 }
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306
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307 static void
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308 flush_dcache(void *__p, int __nbytes)
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309 {
105
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310 CYGARC_HAL_SAVE_GP();
101
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311 #ifdef HAL_DCACHE_FLUSH
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312 HAL_DCACHE_FLUSH( __p , __nbytes );
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313 #elif defined(HAL_DCACHE_INVALIDATE)
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314 HAL_DCACHE_INVALIDATE();
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315 #endif
105
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316 CYGARC_HAL_RESTORE_GP();
101
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317 }
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318
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319 #endif
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320
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321 #if defined(CYGSEM_HAL_VIRTUAL_VECTOR_DIAG)
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322 //-----------------------------------------------------------------------------
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323 // Console IO functions that adhere to the virtual vector table semantics in
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324 // order to ensure proper debug agent mangling when required.
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325 //
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326 // The platform HAL must specify the channel used, and provide raw IO
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327 // routines for that channel. The platform HAL also has the necessary
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328 // information to determine if the channel is already initialized by
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329 // a debug agent (either builtin or in ROM).
115
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330 externC void cyg_hal_plf_comms_init(void);
105
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331 void
101
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332 hal_if_diag_init(void)
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333 {
105
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334 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
103
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335 cyg_hal_plf_comms_init();
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336 #endif
101
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337
115
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338 #ifdef CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_DEFAULT
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339 #define _DEFAULT CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_DEFAULT
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340 #else
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341 #define _DEFAULT (CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL+1)
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342 #endif
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343 #if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL != _DEFAULT
103
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344 // Set console channel. This should only be done when the console channel
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345 // differs from the debug channel to prevent removing the debug agent's
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346 // mangler procs.
107
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347 if (CYGACC_CALL_IF_SET_DEBUG_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT)
103
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348 != CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL)
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349
107
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350 CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL);
115
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351 #endif
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352 #undef _DEFAULT
101
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353 }
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354
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355 void
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356 hal_if_diag_write_char(char c)
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357 {
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358 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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359
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360 if (__chan)
107
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361 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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362 else {
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363 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
107
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364 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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365 }
105
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366
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367 // Check interrupt flag
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368 if (CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG()) {
136
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369 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
105
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370 cyg_hal_user_break(0);
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371 }
101
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372 }
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373
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374 void
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375 hal_if_diag_read_char(char *c)
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376 {
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377 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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378
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379 if (__chan)
107
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380 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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381 else {
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382 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
107
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383 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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384 }
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385 }
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386 #endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG
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387
105
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388 //=============================================================================
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389 // CtrlC support
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390 //=============================================================================
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391
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392 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT) \
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393 || defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT)
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394
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395 struct Hal_SavedRegisters *hal_saved_interrupt_state;
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396
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397 void
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398 hal_ctrlc_isr_init(void)
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399 {
110
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400 // A ROM monitor never enables the interrupt itself. This is left
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401 // to the (RAM) application.
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402 #ifndef CYGSEM_HAL_ROM_MONITOR
105
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403 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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404
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405 #if 1 // Prevents crash on older stubs
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406 if (CYGNUM_CALL_IF_TABLE_VERSION != CYGACC_CALL_IF_VERSION())
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407 return;
110
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408
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409 // Now trash that value - otherwise downloading an image with
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410 // builtin stubs on a board with older stubs may cause all
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411 // subsequent runs to (wrongly) fall through to the below code.
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412 // If there is a new stub on the board, it will reinitialize the
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413 // version field on reset.
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414 // Yes, this is a gross hack!
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415 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION+1);
105
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416 #endif
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417
107
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418 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
110
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419 #endif
105
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420 }
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421
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422 cyg_uint32
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423 hal_ctrlc_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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424 {
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425 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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426 int isr_ret, ctrlc = 0;
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427
107
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428 isr_ret = CYGACC_COMM_IF_DBG_ISR(*__chan, &ctrlc, vector, data);
105
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429 if (ctrlc)
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430 cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state );
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431 return isr_ret;
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432 }
119
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433
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434 cyg_bool
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435 hal_ctrlc_check(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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436 {
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437 hal_virtual_comm_table_t* chan = CYGACC_CALL_IF_DEBUG_PROCS();
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438 int gdb_vector = -1;
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439 int isr_ret, ctrlc = 0;
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440
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441 // This check only to avoid crash on older stubs in case of unhandled
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442 // interrupts. It is a bit messy, but required in a transition period.
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443 if (CYGNUM_CALL_IF_TABLE_VERSION+1 == CYGACC_CALL_IF_VERSION()) {
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444 gdb_vector = CYGACC_COMM_IF_CONTROL(*chan, __COMMCTL_DBG_ISR_VECTOR);
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445 }
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446 if( vector == gdb_vector ) {
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447 isr_ret = CYGACC_COMM_IF_DBG_ISR(*chan, &ctrlc, vector, data);
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448 if (ctrlc)
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449 cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state );
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450 return true;
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451 }
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452 return false;
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453 }
105
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454 #endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT || CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT
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455
101
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456 //--------------------------------------------------------------------------
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457 // Init function. It should be called from the platform initialization code.
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458 // For monitor configurations it will initialize the calling interface table,
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459 // for client configurations it will patch the existing table as per
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460 // configuration.
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461 void
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462 hal_if_init(void)
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463 {
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464 // Set up services provided by monitors
103
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465 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
101
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466 {
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467 int i, j;
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468 // Initialize tables with the NOP service.
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469 // This should only be done for service routine entries - data
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470 // pointers should be NULLed.
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471 for (i = 0; i < CYGNUM_CALL_IF_TABLE_SIZE; i++)
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472 hal_virtual_vector_table[i] = (CYG_ADDRWORD) &nop_service;
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473
112
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474 for (j = 0; j < CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS+1; j++)
101
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475 for (i = 0; i < CYGNUM_COMM_IF_TABLE_SIZE; i++)
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476 comm_channels[j][i] = (CYG_ADDRWORD) &nop_service;
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477
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478
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479 // Fill in supported services.
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480
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481 // Version number
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482 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION);
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483
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484 // ICTRL and EXC tables - I assume these to be the equivalents of
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485 // ISR and VSR tables.
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486 CYGACC_CALL_IF_ICTRL_TABLE_SET(hal_interrupt_handlers);
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487 CYGACC_CALL_IF_EXC_TABLE_SET(hal_vsr_table);
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488
105
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489 // Miscellaneous services with wrappers in this file.
101
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490 CYGACC_CALL_IF_RESET_SET(reset);
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491 CYGACC_CALL_IF_KILL_VECTOR_SET(kill_by_reset);
105
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492 CYGACC_CALL_IF_DELAY_US_SET(delay_us);
101
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493
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494 // Comm controls
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495 CYGACC_CALL_IF_SET_DEBUG_COMM_SET(set_debug_comm);
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496 CYGACC_CALL_IF_SET_CONSOLE_COMM_SET(set_console_comm);
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497
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498 // Cache functions
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499 CYGACC_CALL_IF_FLUSH_ICACHE_SET(flush_icache);
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500 CYGACC_CALL_IF_FLUSH_DCACHE_SET(flush_dcache);
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501
105
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502 // Clear debug and console procs entries. If platform has been
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503 // configured to use a separate console port, it will be set
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504 // up later (hal_diag_init). Alternatively (if this is a stub)
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505 // it will be initialized with the output mangler
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506 // (O-packetizer for GDB) which uses the debug comms.
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507 set_debug_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
103
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508 set_console_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
101
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509
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510 // Data entries not currently supported in eCos
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511 CYGACC_CALL_IF_CPU_DATA_SET(0);
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512 CYGACC_CALL_IF_BOARD_DATA_SET(0);
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513 CYGACC_CALL_IF_DBG_DATA_SET(0);
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514 }
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515 #endif
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516
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517 // Reset console interrupt flag.
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518 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
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519
101
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520 // Set up services provided by clients
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521 #if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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522 ( defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs) \
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523 || defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon))
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524
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525 patch_dbg_syscalls( (void *)(hal_virtual_vector_table) );
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526 #endif
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527
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528 // Init client services
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529 #if !defined(CYGPKG_KERNEL) && defined(CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT)
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530 // Only include this code if we do not have a kernel. Otherwise
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531 // the kernel supplies the functionality for the app we are linked
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532 // with.
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533
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534 // Prepare for application installation of thread info function in
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535 // vector table.
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536 init_thread_syscall( (void *)&hal_virtual_vector_table[CYGNUM_CALL_IF_DBG_SYSCALL] );
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537 #endif
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538
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539 // Finally, install async breakpoint handler if it is configured in.
c37d3a9e1b28 Merge from eCos master repository on 2000-06-16-07:47:03-BST
jlarmour
parents:
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540 // FIXME: this should probably check for STUBS instead (but code is
c37d3a9e1b28 Merge from eCos master repository on 2000-06-16-07:47:03-BST
jlarmour
parents:
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541 // conditional on BREAK for now)
c37d3a9e1b28 Merge from eCos master repository on 2000-06-16-07:47:03-BST
jlarmour
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542 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
c37d3a9e1b28 Merge from eCos master repository on 2000-06-16-07:47:03-BST
jlarmour
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543 // Install async breakpoint handler into vector table.
c37d3a9e1b28 Merge from eCos master repository on 2000-06-16-07:47:03-BST
jlarmour
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544 CYGACC_CALL_IF_INSTALL_BPT_FN_SET(&cyg_hal_gdb_interrupt);
c37d3a9e1b28 Merge from eCos master repository on 2000-06-16-07:47:03-BST
jlarmour
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545 #endif
c37d3a9e1b28 Merge from eCos master repository on 2000-06-16-07:47:03-BST
jlarmour
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546 }