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annotate packages/hal/common/current/src/hal_if.c @ 143:6b5f480c6929 ecos-sw-2000-12-08

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Merge from eCos master repository on 2000-12-08-02:09:36-GMT
author jlarmour
date Fri, 08 Dec 2000 03:30:06 +0000
parents a9ac27ec7abc
children 2e9a636d9de9
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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
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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 CYGARC_HAL_SAVE_GP();
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77 #ifdef CYGPKG_KERNEL
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78 {
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79 cyg_int32 start, elapsed;
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80 cyg_int32 usec_ticks, slice;
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81
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82 // How many ticks total we should wait for.
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83 usec_ticks = usecs*CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;
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84 usec_ticks /= CYGNUM_HAL_RTC_NUMERATOR/CYGNUM_HAL_RTC_DENOMINATOR/1000;
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85
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86 do {
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87 // Spin in slices of 1/2 the RTC period. Allows interrupts
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88 // time to run without messing up the algorithm. If we spun
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89 // for 1 period (or more) of the RTC, there'd be also problems
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90 // figuring out when the timer wrapped. We may lose a tick or
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91 // two for each cycle but it shouldn't matter much.
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92 slice = usec_ticks % (CYGNUM_KERNEL_COUNTERS_RTC_PERIOD / 2);
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93
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94 HAL_CLOCK_READ(&start);
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95 do {
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96 HAL_CLOCK_READ(&elapsed);
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97 elapsed = (elapsed - start); // counts up!
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98 if (elapsed < 0)
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99 elapsed += CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;
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100 } while (elapsed < slice);
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101
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102 // Adjust by elapsed, not slice, since an interrupt may have
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103 // been stalling us for some time.
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104 usec_ticks -= elapsed;
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105 } while (usec_ticks > 0);
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106 }
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107 #else
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108 #ifdef HAL_DELAY_US
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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 10 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 < 10; i++);
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121 }
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122 #endif
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123 #endif
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124 CYGARC_HAL_RESTORE_GP();
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125 }
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126
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127 static void
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128 reset(void)
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129 {
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130 CYGARC_HAL_SAVE_GP();
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131 // With luck, the platform defines some magic that will cause a hardware
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132 // reset.
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133 HAL_STUB_PLATFORM_RESET();
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134
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135 #ifdef HAL_STUB_PLATFORM_RESET_ENTRY
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136 // If that's not the case (above is an empty statement) there may
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137 // be defined an address we can jump to - and effectively
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138 // reinitialize the system. Not quite as good as a reset, but it
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139 // is often enough.
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140 goto *HAL_STUB_PLATFORM_RESET_ENTRY;
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141
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142 #else
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143 #error " no RESET_ENTRY"
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144 #endif
105
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145
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146 CYGARC_HAL_RESTORE_GP();
101
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147 }
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148
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149 // This is the system's default kill signal routine. Unless overridden
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150 // by the application, it will cause a board reset when GDB quits the
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151 // connection. (The user can avoid the reset by using the GDB 'detach'
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152 // command instead of 'kill' or 'quit').
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153 static int
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154 kill_by_reset(int __irq_nr, void* __regs)
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155 {
105
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156 CYGARC_HAL_SAVE_GP();
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157
101
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158 reset();
105
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159
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160 CYGARC_HAL_RESTORE_GP();
101
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161 return 0;
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162 }
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163
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164 static int
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165 nop_service(void)
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166 {
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167 // This is the default service. It always returns false (0), and
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168 // _does_ not trigger any assertions. Clients must either cope
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169 // with the service failure or assert.
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170 return 0;
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171 }
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172
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173 //----------------------------------
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174 // Comm controls
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175
112
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176 #ifdef CYGNUM_HAL_VIRTUAL_VECTOR_AUX_CHANNELS
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177 #define CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS \
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178 (CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS+CYGNUM_HAL_VIRTUAL_VECTOR_AUX_CHANNELS)
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179 #else
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180 #define CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS \
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181 CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS
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182 #endif
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183
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184 static hal_virtual_comm_table_t comm_channels[CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS+1];
103
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185
101
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186 static int
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187 set_debug_comm(int __comm_id)
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188 {
103
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189 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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190 hal_virtual_comm_table_t* __chan;
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191 int interrupt_state = 0;
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192 int res = 1, update = 0;
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193 CYGARC_HAL_SAVE_GP();
101
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194
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195 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
112
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196 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS,
101
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197 "Invalid channel");
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198
103
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199 switch (__comm_id) {
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200 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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201 if (__selected_id > 0)
105
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202 res = __selected_id-1;
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203 else if (__selected_id == 0)
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204 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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205 else
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206 res = __selected_id;
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207 break;
101
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208
103
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209 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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210 CYGACC_CALL_IF_DEBUG_PROCS_SET(0);
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211 __selected_id = __comm_id;
105
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212 break;
103
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213
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214 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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215 __comm_id = 0;
105
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216 update = 1;
103
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217 break;
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218
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219 default:
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220 __comm_id++; // skip mangler entry
105
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221 update = 1;
103
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222 break;
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223 }
105
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224
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225 if (update) {
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226 // Find the interrupt state of the channel.
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227 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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228 if (__chan)
107
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229 interrupt_state = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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230
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231 __selected_id = __comm_id;
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232 CYGACC_CALL_IF_DEBUG_PROCS_SET(comm_channels[__comm_id]);
101
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233
105
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234 // Set interrupt state on the new channel.
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235 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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236 if (interrupt_state)
107
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237 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
105
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238 else
107
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239 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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240 }
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241
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242 CYGARC_HAL_RESTORE_GP();
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243 return res;
101
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244 }
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245
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246 static int
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247 set_console_comm(int __comm_id)
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248 {
103
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249 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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250 int res = 1, update = 0;
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251 CYGARC_HAL_SAVE_GP();
101
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252
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253 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
112
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254 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS,
101
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255 "Invalid channel");
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256
103
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257 switch (__comm_id) {
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258 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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259 if (__selected_id > 0)
105
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260 res = __selected_id-1;
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261 else if (__selected_id == 0)
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262 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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263 else
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264 res = __selected_id;
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265 break;
101
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266
103
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267 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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268 CYGACC_CALL_IF_CONSOLE_PROCS_SET(0);
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269 __selected_id = __comm_id;
105
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270 break;
103
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271
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272 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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273 __comm_id = 0;
105
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274 update = 1;
103
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275 break;
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276
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277 default:
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278 __comm_id++; // skip mangler entry
105
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279 update = 1;
103
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280 break;
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281 }
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282
105
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283 if (update) {
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284 __selected_id = __comm_id;
101
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285
105
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286 CYGACC_CALL_IF_CONSOLE_PROCS_SET(comm_channels[__comm_id]);
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287 }
101
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288
105
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289 CYGARC_HAL_RESTORE_GP();
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290 return res;
101
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291 }
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292
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293 //----------------------------------
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294 // Cache functions
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295
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296 static void
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297 flush_icache(void *__p, int __nbytes)
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298 {
105
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299 CYGARC_HAL_SAVE_GP();
101
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300 #ifdef HAL_ICACHE_FLUSH
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301 HAL_ICACHE_FLUSH( __p , __nbytes );
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302 #elif defined(HAL_ICACHE_INVALIDATE)
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303 HAL_ICACHE_INVALIDATE();
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304 #endif
105
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305 CYGARC_HAL_RESTORE_GP();
101
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306 }
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307
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308 static void
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309 flush_dcache(void *__p, int __nbytes)
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310 {
105
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311 CYGARC_HAL_SAVE_GP();
101
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312 #ifdef HAL_DCACHE_FLUSH
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313 HAL_DCACHE_FLUSH( __p , __nbytes );
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314 #elif defined(HAL_DCACHE_INVALIDATE)
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315 HAL_DCACHE_INVALIDATE();
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316 #endif
105
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317 CYGARC_HAL_RESTORE_GP();
101
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318 }
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319
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320 #endif
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321
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322 #if defined(CYGSEM_HAL_VIRTUAL_VECTOR_DIAG)
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323 //-----------------------------------------------------------------------------
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324 // Console IO functions that adhere to the virtual vector table semantics in
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325 // order to ensure proper debug agent mangling when required.
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326 //
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327 // The platform HAL must specify the channel used, and provide raw IO
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328 // routines for that channel. The platform HAL also has the necessary
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329 // information to determine if the channel is already initialized by
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330 // a debug agent (either builtin or in ROM).
115
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331 externC void cyg_hal_plf_comms_init(void);
105
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332 void
101
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333 hal_if_diag_init(void)
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334 {
105
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335 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
103
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336 cyg_hal_plf_comms_init();
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337 #endif
101
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338
115
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339 #ifdef CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_DEFAULT
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340 #define _DEFAULT CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_DEFAULT
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341 #else
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342 #define _DEFAULT (CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL+1)
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343 #endif
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344 #if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL != _DEFAULT
103
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345 // Set console channel. This should only be done when the console channel
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346 // differs from the debug channel to prevent removing the debug agent's
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347 // mangler procs.
107
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348 if (CYGACC_CALL_IF_SET_DEBUG_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT)
103
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349 != CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL)
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350
107
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351 CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL);
115
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352 #endif
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353 #undef _DEFAULT
101
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354 }
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355
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356 void
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357 hal_if_diag_write_char(char c)
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358 {
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359 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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360
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361 if (__chan)
107
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362 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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363 else {
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364 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
107
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365 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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366 }
105
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367
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368 // Check interrupt flag
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369 if (CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG()) {
136
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370 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
105
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371 cyg_hal_user_break(0);
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372 }
101
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373 }
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374
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375 void
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376 hal_if_diag_read_char(char *c)
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377 {
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378 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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379
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380 if (__chan)
107
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381 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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382 else {
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383 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
107
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384 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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385 }
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386 }
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387 #endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG
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388
105
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389 //=============================================================================
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390 // CtrlC support
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391 //=============================================================================
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392
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393 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT) \
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394 || defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT)
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395
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396 struct Hal_SavedRegisters *hal_saved_interrupt_state;
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397
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398 void
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399 hal_ctrlc_isr_init(void)
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400 {
110
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401 // A ROM monitor never enables the interrupt itself. This is left
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402 // to the (RAM) application.
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403 #ifndef CYGSEM_HAL_ROM_MONITOR
105
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404 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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405
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406 #if 1 // Prevents crash on older stubs
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407 if (CYGNUM_CALL_IF_TABLE_VERSION != CYGACC_CALL_IF_VERSION())
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408 return;
110
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409
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410 // Now trash that value - otherwise downloading an image with
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411 // builtin stubs on a board with older stubs may cause all
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412 // subsequent runs to (wrongly) fall through to the below code.
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413 // If there is a new stub on the board, it will reinitialize the
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414 // version field on reset.
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415 // Yes, this is a gross hack!
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416 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION+1);
105
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417 #endif
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418
107
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419 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
110
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420 #endif
105
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421 }
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422
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423 cyg_uint32
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424 hal_ctrlc_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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425 {
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426 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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427 int isr_ret, ctrlc = 0;
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428
107
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429 isr_ret = CYGACC_COMM_IF_DBG_ISR(*__chan, &ctrlc, vector, data);
105
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430 if (ctrlc)
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431 cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state );
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432 return isr_ret;
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433 }
119
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434
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435 cyg_bool
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436 hal_ctrlc_check(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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437 {
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438 hal_virtual_comm_table_t* chan = CYGACC_CALL_IF_DEBUG_PROCS();
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439 int gdb_vector = -1;
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440 int isr_ret, ctrlc = 0;
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441
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442 // This check only to avoid crash on older stubs in case of unhandled
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443 // interrupts. It is a bit messy, but required in a transition period.
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444 if (CYGNUM_CALL_IF_TABLE_VERSION+1 == CYGACC_CALL_IF_VERSION()) {
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445 gdb_vector = CYGACC_COMM_IF_CONTROL(*chan, __COMMCTL_DBG_ISR_VECTOR);
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446 }
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447 if( vector == gdb_vector ) {
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448 isr_ret = CYGACC_COMM_IF_DBG_ISR(*chan, &ctrlc, vector, data);
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449 if (ctrlc)
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450 cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state );
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451 return true;
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452 }
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453 return false;
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454 }
105
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455 #endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT || CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT
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456
101
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457 //--------------------------------------------------------------------------
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458 // Init function. It should be called from the platform initialization code.
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459 // For monitor configurations it will initialize the calling interface table,
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460 // for client configurations it will patch the existing table as per
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461 // configuration.
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462 void
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463 hal_if_init(void)
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464 {
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465 // Set up services provided by monitors
103
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466 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
101
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467 {
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468 int i, j;
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469 // Initialize tables with the NOP service.
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470 // This should only be done for service routine entries - data
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471 // pointers should be NULLed.
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472 for (i = 0; i < CYGNUM_CALL_IF_TABLE_SIZE; i++)
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473 hal_virtual_vector_table[i] = (CYG_ADDRWORD) &nop_service;
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474
112
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475 for (j = 0; j < CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS+1; j++)
101
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476 for (i = 0; i < CYGNUM_COMM_IF_TABLE_SIZE; i++)
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477 comm_channels[j][i] = (CYG_ADDRWORD) &nop_service;
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478
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479
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480 // Fill in supported services.
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481
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482 // Version number
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483 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION);
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484
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485 // ICTRL and EXC tables - I assume these to be the equivalents of
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486 // ISR and VSR tables.
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487 CYGACC_CALL_IF_ICTRL_TABLE_SET(hal_interrupt_handlers);
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488 CYGACC_CALL_IF_EXC_TABLE_SET(hal_vsr_table);
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489
105
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490 // Miscellaneous services with wrappers in this file.
101
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491 CYGACC_CALL_IF_RESET_SET(reset);
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492 CYGACC_CALL_IF_KILL_VECTOR_SET(kill_by_reset);
105
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493 CYGACC_CALL_IF_DELAY_US_SET(delay_us);
101
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494
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495 // Comm controls
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496 CYGACC_CALL_IF_SET_DEBUG_COMM_SET(set_debug_comm);
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497 CYGACC_CALL_IF_SET_CONSOLE_COMM_SET(set_console_comm);
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498
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499 // Cache functions
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500 CYGACC_CALL_IF_FLUSH_ICACHE_SET(flush_icache);
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501 CYGACC_CALL_IF_FLUSH_DCACHE_SET(flush_dcache);
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502
105
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503 // Clear debug and console procs entries. If platform has been
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504 // configured to use a separate console port, it will be set
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505 // up later (hal_diag_init). Alternatively (if this is a stub)
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506 // it will be initialized with the output mangler
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507 // (O-packetizer for GDB) which uses the debug comms.
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508 set_debug_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
103
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509 set_console_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
101
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510
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511 // Data entries not currently supported in eCos
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512 CYGACC_CALL_IF_CPU_DATA_SET(0);
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513 CYGACC_CALL_IF_BOARD_DATA_SET(0);
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514 CYGACC_CALL_IF_DBG_DATA_SET(0);
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515 }
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516 #endif
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517
105
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518 // Reset console interrupt flag.
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519 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
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520
101
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521 // Set up services provided by clients
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522 #if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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523 ( defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs) \
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524 || defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon))
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525
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526 patch_dbg_syscalls( (void *)(hal_virtual_vector_table) );
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527 #endif
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528
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529 // Init client services
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530 #if !defined(CYGPKG_KERNEL) && defined(CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT)
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531 // Only include this code if we do not have a kernel. Otherwise
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532 // the kernel supplies the functionality for the app we are linked
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533 // with.
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534
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535 // Prepare for application installation of thread info function in
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536 // vector table.
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537 init_thread_syscall( (void *)&hal_virtual_vector_table[CYGNUM_CALL_IF_DBG_SYSCALL] );
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538 #endif
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539
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540 // Finally, install async breakpoint handler if it is configured in.
c37d3a9e1b28 Merge from eCos master repository on 2000-06-16-07:47:03-BST
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541 // FIXME: this should probably check for STUBS instead (but code is
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542 // conditional on BREAK for now)
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543 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
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544 // Install async breakpoint handler into vector table.
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545 CYGACC_CALL_IF_INSTALL_BPT_FN_SET(&cyg_hal_gdb_interrupt);
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546 #endif
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547 }