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annotate packages/hal/mn10300/stb/current/src/plf_stub.c @ 76:435cced73e2f ecos-v1_3_1-release

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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
author jlarmour
date Tue, 28 Mar 2000 14:10:45 +0000
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children 4c750ce71ae3
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435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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1 //=============================================================================
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2 //
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3 // plf_stub.c
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4 //
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5 // Platform specific code for GDB stub support.
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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): nickg, jskov (based on the old mn10300 hal_stub.c)
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35 // Contributors:nickg, jskov
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36 // Date: 1999-02-12
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37 // Purpose: Platform specific code for GDB stub support.
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38 //
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39 //####DESCRIPTIONEND####
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40 //
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41 //=============================================================================
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42
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43 #include <pkgconf/hal.h>
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44
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45 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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46
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47 #include <cyg/hal/hal_stub.h>
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48
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49 #include <cyg/hal/hal_io.h> // HAL IO macros
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50 #include <cyg/hal/hal_intr.h> // HAL interrupt macros
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51
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52 //---------------------------------------------------------------------------
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53 // MN10300 Serial line
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54
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55 // We use serial0 on AM33
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56 #define SERIAL0_CR ((volatile cyg_uint16 *)0xd4002000)
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57 #define SERIAL0_ICR ((volatile cyg_uint8 *) 0xd4002004)
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58 #define SERIAL0_TXR ((volatile cyg_uint8 *) 0xd4002008)
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59 #define SERIAL0_RXR ((volatile cyg_uint8 *) 0xd4002009)
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60 #define SERIAL0_SR ((volatile cyg_uint16 *)0xd400200c)
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61
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62 // Timer 2 provides baud rate divisor
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63 #define TIMER0_MD ((volatile cyg_uint8 *)0xd4003002)
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64 #define TIMER0_BR ((volatile cyg_uint8 *)0xd4003012)
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65 #define TIMER0_CR ((volatile cyg_uint8 *)0xd4003022)
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66
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67 #define SIO1_LSTAT_TRDY 0x20
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68 #define SIO1_LSTAT_RRDY 0x10
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69
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70
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71 //---------------------------------------------------------------------------
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72
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73 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT
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74 // This ISR is called from the interrupt handler. This should only
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75 // happen when there is no serial driver, so the code shouldn't mess
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76 // anything up.
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77 int cyg_hal_gdb_isr(cyg_uint32 vector, target_register_t pc)
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78 {
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79 if ( CYGNUM_HAL_INTERRUPT_SERIAL_0_RX == vector ) {
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80 cyg_uint8 c;
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81
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82 HAL_READ_UINT8 (SERIAL0_RXR, c);
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83 HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX);
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84
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85 if( 3 == c )
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86 {
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87 // Ctrl-C: set a breakpoint at PC so GDB will display the
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88 // correct program context when stopping rather than the
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89 // interrupt handler.
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90 cyg_hal_gdb_interrupt (pc);
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91
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92 // Interrupt handled. Don't call ISR proper. At return
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93 // from the VSR, execution will stop at the breakpoint
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94 // just set.
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95 return 0;
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96 }
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97 }
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98
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99 // Not caused by GDB. Call ISR proper.
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100 return 1;
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101 }
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102
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103 int hal_stb_interruptible(int state)
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104 {
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105 if (state) {
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106 HAL_WRITE_UINT8 (SERIAL0_ICR, 0);
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107 HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)
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108 HAL_INTERRUPT_UNMASK (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)
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109 } else {
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110 HAL_INTERRUPT_MASK (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)
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111 }
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112 return 0;
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113 }
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114
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115 void hal_stb_init_break_irq( void )
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116 {
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117 // Enable serial receive interrupts.
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118 HAL_WRITE_UINT8 (SERIAL0_ICR, 0);
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119 HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)
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120 HAL_INTERRUPT_UNMASK (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)
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121 HAL_ENABLE_INTERRUPTS();
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122 }
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123 #endif
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124
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125 // Initialize the current serial port.
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126 void hal_stb_init_serial( void )
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127 {
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128 // 99 translates to 38400 baud.
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129 HAL_WRITE_UINT8 (TIMER0_BR, 99);
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130
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131 // Timer0 sourced from IOCLK
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132 HAL_WRITE_UINT8 (TIMER0_MD, 0x80);
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133
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134 // No interrupts for now.
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135 HAL_WRITE_UINT8 (SERIAL0_ICR, 0x00);
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136
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137 // Source from timer 1, 8bit chars, enable tx and rx
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138 HAL_WRITE_UINT16 (SERIAL0_CR, 0xc085);
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139
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140 }
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141
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142 // Write C to the current serial port.
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143 void hal_stb_put_char( int c )
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144 {
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145 cyg_uint16 sr;
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146
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147 do {
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148 HAL_READ_UINT16 (SERIAL0_SR, sr);
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149 } while ((sr & SIO1_LSTAT_TRDY) != 0);
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150
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151 HAL_WRITE_UINT8 (SERIAL0_TXR, c);
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152 }
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153
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154 // Read one character from the current serial port.
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155 int hal_stb_get_char( void )
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156 {
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157 char c;
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158 cyg_uint16 sr;
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159
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160 do {
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161 HAL_READ_UINT16 (SERIAL0_SR, sr);
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162 } while ((sr & SIO1_LSTAT_RRDY) == 0);
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163
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164 HAL_READ_UINT8 (SERIAL0_RXR, c);
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165
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166 return c;
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167 }
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168
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169 //-----------------------------------------------------------------------------
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170
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171 void hal_stb_platform_init(void)
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172 {
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173 extern CYG_ADDRESS hal_virtual_vector_table[64];
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174 extern void init_thread_syscall( void *);
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175 extern void install_async_breakpoint(void *epc);
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176 // void (*oldvsr)(void);
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177 extern void __default_exception_vsr(void);
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178
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179 // Ensure that the breakpoint VSR points to the default VSR. This will pass
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180 // it on to the stubs.
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181 // HAL_VSR_SET( CYGNUM_HAL_VECTOR_BREAKPOINT, __default_exception_vsr, &oldvsr );
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182
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183 // Install async breakpoint handler into vector table.
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184 hal_virtual_vector_table[35] = (CYG_ADDRESS)install_async_breakpoint;
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185
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186 #if !defined(CYGPKG_KERNEL) && defined(CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT)
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187 // Only include this code if we do not have a kernel. Otherwise
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188 // the kernel supplies the functionality for the app we are linked
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189 // with.
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190
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191 // Prepare for application installation of thread info function in
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192 // vector table.
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193 hal_virtual_vector_table[15] = 0;
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194 init_thread_syscall( (void *)&hal_virtual_vector_table[15] );
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195
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196 #endif
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197 }
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198
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199
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200 #endif // ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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201 //-----------------------------------------------------------------------------
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202 // End of plf_stub.c