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annotate packages/hal/common/current/src/hal_if.c @ 110:84e4bde58b26 ecos-sw-2000-07-14

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Merge from eCos master repository on 2000-07-14-22:00:02-BST
author jlarmour
date Mon, 17 Jul 2000 14:42:27 +0000
parents 7f461c3a372c
children 02ea4320376c
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1 //=============================================================================
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2 //
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3 // hal_if.c
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4 //
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5 // ROM/RAM interfacing functions
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6 //
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7 //=============================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //=============================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jskov
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35 // Contributors:jskov
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36 // Date: 2000-06-07
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37 //
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38 //####DESCRIPTIONEND####
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39 //
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40 //=============================================================================
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41
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42 #include <pkgconf/hal.h>
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43
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44 #ifdef CYGPKG_KERNEL
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45 # include <pkgconf/kernel.h>
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46 #endif
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47
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48 #include <cyg/infra/cyg_ass.h> // assertions
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49
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50 #include <cyg/hal/hal_arch.h> // set/restore GP
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51
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52 #include <cyg/hal/hal_io.h> // IO macros
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53 #include <cyg/hal/hal_if.h> // our interface
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54
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55 #include <cyg/hal/hal_diag.h> // Diag IO
105
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56 #include <cyg/hal/hal_misc.h> // User break
101
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57
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58 #include <cyg/hal/hal_stub.h> // stub functionality
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59 #include <cyg/hal/plf_stub.h> // reset entry - FIXME, should be moved
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60
105
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61 #include <cyg/hal/hal_intr.h> // hal_vsr_table and others
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62
101
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63
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64 //--------------------------------------------------------------------------
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65
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66 externC void patch_dbg_syscalls(void * vector);
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67 externC void init_thread_syscall(void * vector);
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68
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69 //--------------------------------------------------------------------------
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70 // Implementations and function wrappers for monitor services
105
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71
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72 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
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73 static void
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74 delay_us(cyg_int32 usecs)
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75 {
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76 #ifdef CYGPKG_KERNEL
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77 cyg_int32 start, elapsed;
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78 cyg_int32 usec_ticks, slice;
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79 CYGARC_HAL_SAVE_GP();
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80
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81 // How many ticks total we should wait for.
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82 usec_ticks = usecs*CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;
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83 usec_ticks /= CYGNUM_HAL_RTC_NUMERATOR/CYGNUM_HAL_RTC_DENOMINATOR/1000;
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84
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85 do {
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86 // Spin in slices of 1/2 the RTC period. Allows interrupts
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87 // time to run without messing up the algorithm. If we spun
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88 // for 1 period (or more) of the RTC, there'd be also problems
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89 // figuring out when the timer wrapped. We may lose a tick or
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90 // two for each cycle but it shouldn't matter much.
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91 slice = usec_ticks % (CYGNUM_KERNEL_COUNTERS_RTC_PERIOD / 2);
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92
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93 HAL_CLOCK_READ(&start);
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94 do {
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95 HAL_CLOCK_READ(&elapsed);
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96 elapsed = (elapsed - start); // counts up!
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97 if (elapsed < 0)
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98 elapsed += CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;
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99 } while (elapsed < slice);
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100
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101 // Adjust by elapsed, not slice, since an interrupt may have
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102 // been stalling us for some time.
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103 usec_ticks -= elapsed;
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104 } while (usec_ticks > 0);
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105
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106 CYGARC_HAL_RESTORE_GP();
110
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107 #else
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108 // Use a HAL feature if defined
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109 #ifdef HAL_DELAY_US
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110 HAL_DELAY_US(usecs);
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111 #endif
105
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112 #endif
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113 }
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114
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115 static void
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116 reset(void)
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117 {
105
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118 CYGARC_HAL_SAVE_GP();
101
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119 // With luck, the platform defines some magic that will cause a hardware
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120 // reset.
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121 HAL_STUB_PLATFORM_RESET();
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122
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123 #ifdef HAL_STUB_PLATFORM_RESET_ENTRY
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124 // If that's not the case (above is an empty statement) there may
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125 // be defined an address we can jump to - and effectively
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126 // reinitialize the system. Not quite as good as a reset, but it
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127 // is often enough.
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128 goto *HAL_STUB_PLATFORM_RESET_ENTRY;
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129
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130 #else
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131 #error " no RESET_ENTRY"
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132 #endif
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133
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134 CYGARC_HAL_RESTORE_GP();
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135 }
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136
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137 // This is the system's default kill signal routine. Unless overridden
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138 // by the application, it will cause a board reset when GDB quits the
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139 // connection. (The user can avoid the reset by using the GDB 'detach'
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140 // command instead of 'kill' or 'quit').
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141 static int
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142 kill_by_reset(int __irq_nr, void* __regs)
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143 {
105
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144 CYGARC_HAL_SAVE_GP();
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145
101
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146 reset();
105
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147
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148 CYGARC_HAL_RESTORE_GP();
101
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149 return 0;
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150 }
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151
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152 static int
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153 nop_service(void)
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154 {
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155 // This is the default service. It always returns false (0), and
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156 // _does_ not trigger any assertions. Clients must either cope
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157 // with the service failure or assert.
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158 return 0;
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159 }
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160
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161 //----------------------------------
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162 // Comm controls
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163
103
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164 static hal_virtual_comm_table_t comm_channels[CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS+1];
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165
101
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166 static int
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167 set_debug_comm(int __comm_id)
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168 {
103
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169 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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170 hal_virtual_comm_table_t* __chan;
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171 int interrupt_state = 0;
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172 int res = 1, update = 0;
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173 CYGARC_HAL_SAVE_GP();
101
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174
103
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175 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
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176 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS,
101
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177 "Invalid channel");
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178
103
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179 switch (__comm_id) {
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180 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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181 if (__selected_id > 0)
105
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182 res = __selected_id-1;
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183 else if (__selected_id == 0)
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184 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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185 else
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186 res = __selected_id;
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187 break;
101
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188
103
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189 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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190 CYGACC_CALL_IF_DEBUG_PROCS_SET(0);
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191 __selected_id = __comm_id;
105
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192 break;
103
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193
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194 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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195 __comm_id = 0;
105
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196 update = 1;
103
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197 break;
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198
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199 default:
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200 __comm_id++; // skip mangler entry
105
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201 update = 1;
103
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202 break;
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203 }
105
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204
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205 if (update) {
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206 // Find the interrupt state of the channel.
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207 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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208 if (__chan)
107
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209 interrupt_state = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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210
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211 __selected_id = __comm_id;
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212 CYGACC_CALL_IF_DEBUG_PROCS_SET(comm_channels[__comm_id]);
101
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213
105
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214 // Set interrupt state on the new channel.
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215 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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216 if (interrupt_state)
107
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217 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
105
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218 else
107
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219 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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220 }
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221
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222 CYGARC_HAL_RESTORE_GP();
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223 return res;
101
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224 }
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225
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226 static int
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227 set_console_comm(int __comm_id)
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228 {
103
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229 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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230 int res = 1, update = 0;
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231 CYGARC_HAL_SAVE_GP();
101
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232
103
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233 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
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234 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS,
101
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235 "Invalid channel");
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236
103
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237 switch (__comm_id) {
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238 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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239 if (__selected_id > 0)
105
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240 res = __selected_id-1;
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241 else if (__selected_id == 0)
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242 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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243 else
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244 res = __selected_id;
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245 break;
101
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246
103
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247 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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248 CYGACC_CALL_IF_CONSOLE_PROCS_SET(0);
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249 __selected_id = __comm_id;
105
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250 break;
103
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251
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252 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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253 __comm_id = 0;
105
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254 update = 1;
103
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255 break;
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256
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257 default:
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258 __comm_id++; // skip mangler entry
105
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259 update = 1;
103
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260 break;
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261 }
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262
105
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263 if (update) {
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264 __selected_id = __comm_id;
101
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265
105
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266 CYGACC_CALL_IF_CONSOLE_PROCS_SET(comm_channels[__comm_id]);
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267 }
101
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268
105
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269 CYGARC_HAL_RESTORE_GP();
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270 return res;
101
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271 }
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272
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273 //----------------------------------
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274 // Cache functions
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275
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276 static void
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277 flush_icache(void *__p, int __nbytes)
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278 {
105
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279 CYGARC_HAL_SAVE_GP();
101
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280 #ifdef HAL_ICACHE_FLUSH
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281 HAL_ICACHE_FLUSH( __p , __nbytes );
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282 #elif defined(HAL_ICACHE_INVALIDATE)
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283 HAL_ICACHE_INVALIDATE();
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284 #endif
105
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285 CYGARC_HAL_RESTORE_GP();
101
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286 }
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287
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288 static void
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289 flush_dcache(void *__p, int __nbytes)
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290 {
105
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291 CYGARC_HAL_SAVE_GP();
101
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292 #ifdef HAL_DCACHE_FLUSH
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293 HAL_DCACHE_FLUSH( __p , __nbytes );
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294 #elif defined(HAL_DCACHE_INVALIDATE)
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295 HAL_DCACHE_INVALIDATE();
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296 #endif
105
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297 CYGARC_HAL_RESTORE_GP();
101
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298 }
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299
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300 #endif
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301
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302 #if defined(CYGSEM_HAL_VIRTUAL_VECTOR_DIAG)
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303 //-----------------------------------------------------------------------------
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304 // Console IO functions that adhere to the virtual vector table semantics in
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305 // order to ensure proper debug agent mangling when required.
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306 //
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307 // The platform HAL must specify the channel used, and provide raw IO
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308 // routines for that channel. The platform HAL also has the necessary
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309 // information to determine if the channel is already initialized by
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310 // a debug agent (either builtin or in ROM).
105
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311 void
101
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312 hal_if_diag_init(void)
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313 {
105
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314 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
103
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315 cyg_hal_plf_comms_init();
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316 #endif
101
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317
103
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318 // Set console channel. This should only be done when the console channel
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319 // differs from the debug channel to prevent removing the debug agent's
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320 // mangler procs.
107
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321 if (CYGACC_CALL_IF_SET_DEBUG_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT)
103
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322 != CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL)
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323
107
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324 CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL);
101
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325 }
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326
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327 void
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328 hal_if_diag_write_char(char c)
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329 {
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330 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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331
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332 if (__chan)
107
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333 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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334 else {
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335 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
107
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336 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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337 }
105
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338
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339 // Check interrupt flag
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340 if (CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG()) {
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341 cyg_hal_user_break(0);
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342 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
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343 }
101
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344 }
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345
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346 void
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347 hal_if_diag_read_char(char *c)
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348 {
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349 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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350
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351 if (__chan)
107
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352 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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353 else {
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354 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
107
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355 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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356 }
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357 }
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358 #endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG
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359
105
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360 //=============================================================================
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361 // CtrlC support
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362 //=============================================================================
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363
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364 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT) \
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365 || defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT)
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366
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367 struct Hal_SavedRegisters *hal_saved_interrupt_state;
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368
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369 void
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370 hal_ctrlc_isr_init(void)
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371 {
110
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372 // A ROM monitor never enables the interrupt itself. This is left
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373 // to the (RAM) application.
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374 #ifndef CYGSEM_HAL_ROM_MONITOR
105
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375 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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376
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377 #if 1 // Prevents crash on older stubs
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378 if (CYGNUM_CALL_IF_TABLE_VERSION != CYGACC_CALL_IF_VERSION())
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379 return;
110
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380
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381 // Now trash that value - otherwise downloading an image with
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382 // builtin stubs on a board with older stubs may cause all
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383 // subsequent runs to (wrongly) fall through to the below code.
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384 // If there is a new stub on the board, it will reinitialize the
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385 // version field on reset.
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386 // Yes, this is a gross hack!
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387 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION+1);
105
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388 #endif
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389
107
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390 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
110
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391 #endif
105
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392 }
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393
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394 cyg_uint32
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395 hal_ctrlc_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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396 {
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397 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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398 int isr_ret, ctrlc = 0;
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399
107
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400 isr_ret = CYGACC_COMM_IF_DBG_ISR(*__chan, &ctrlc, vector, data);
105
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401 if (ctrlc)
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402 cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state );
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403 return isr_ret;
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404 }
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405 #endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT || CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT
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406
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407 //--------------------------------------------------------------------------
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408 // Init function. It should be called from the platform initialization code.
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409 // For monitor configurations it will initialize the calling interface table,
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410 // for client configurations it will patch the existing table as per
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411 // configuration.
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412 void
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413 hal_if_init(void)
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414 {
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415 // Set up services provided by monitors
103
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416 #ifdef CYGPRI_HAL_IMPLEMENTS_IF_SERVICES
101
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417 {
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418 int i, j;
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419 // Initialize tables with the NOP service.
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420 // This should only be done for service routine entries - data
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421 // pointers should be NULLed.
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422 for (i = 0; i < CYGNUM_CALL_IF_TABLE_SIZE; i++)
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423 hal_virtual_vector_table[i] = (CYG_ADDRWORD) &nop_service;
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424
103
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425 for (j = 0; j < CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS+1; j++)
101
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426 for (i = 0; i < CYGNUM_COMM_IF_TABLE_SIZE; i++)
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427 comm_channels[j][i] = (CYG_ADDRWORD) &nop_service;
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428
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429
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430 // Fill in supported services.
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431
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432 // Version number
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433 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION);
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434
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435 // ICTRL and EXC tables - I assume these to be the equivalents of
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436 // ISR and VSR tables.
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437 CYGACC_CALL_IF_ICTRL_TABLE_SET(hal_interrupt_handlers);
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438 CYGACC_CALL_IF_EXC_TABLE_SET(hal_vsr_table);
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439
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440 // Miscellaneous services with wrappers in this file.
101
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441 CYGACC_CALL_IF_RESET_SET(reset);
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442 CYGACC_CALL_IF_KILL_VECTOR_SET(kill_by_reset);
105
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443 CYGACC_CALL_IF_DELAY_US_SET(delay_us);
101
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444
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445 // Comm controls
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446 CYGACC_CALL_IF_SET_DEBUG_COMM_SET(set_debug_comm);
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447 CYGACC_CALL_IF_SET_CONSOLE_COMM_SET(set_console_comm);
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448
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449 // Cache functions
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450 CYGACC_CALL_IF_FLUSH_ICACHE_SET(flush_icache);
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451 CYGACC_CALL_IF_FLUSH_DCACHE_SET(flush_dcache);
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452
105
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453 // Clear debug and console procs entries. If platform has been
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454 // configured to use a separate console port, it will be set
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455 // up later (hal_diag_init). Alternatively (if this is a stub)
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456 // it will be initialized with the output mangler
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457 // (O-packetizer for GDB) which uses the debug comms.
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458 set_debug_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
103
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459 set_console_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
101
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460
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461 // Data entries not currently supported in eCos
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462 CYGACC_CALL_IF_CPU_DATA_SET(0);
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463 CYGACC_CALL_IF_BOARD_DATA_SET(0);
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464 CYGACC_CALL_IF_DBG_DATA_SET(0);
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465 }
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466 #endif
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467
105
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468 // Reset console interrupt flag.
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469 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
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470
101
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471 // Set up services provided by clients
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472 #if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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473 ( defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs) \
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474 || defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon))
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475
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476 patch_dbg_syscalls( (void *)(hal_virtual_vector_table) );
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477 #endif
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478
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479 // Init client services
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480 #if !defined(CYGPKG_KERNEL) && defined(CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT)
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481 // Only include this code if we do not have a kernel. Otherwise
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482 // the kernel supplies the functionality for the app we are linked
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483 // with.
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484
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485 // Prepare for application installation of thread info function in
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486 // vector table.
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487 init_thread_syscall( (void *)&hal_virtual_vector_table[CYGNUM_CALL_IF_DBG_SYSCALL] );
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488 #endif
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489
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490 // Finally, install async breakpoint handler if it is configured in.
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491 // FIXME: this should probably check for STUBS instead (but code is
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492 // conditional on BREAK for now)
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493 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
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494 // Install async breakpoint handler into vector table.
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495 CYGACC_CALL_IF_INSTALL_BPT_FN_SET(&cyg_hal_gdb_interrupt);
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496 #endif
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497 }