1 | /* |
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2 | * Tty IO Driver |
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3 | * This is a "libio" driver based on libc/support/generic/libio interface |
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4 | * which is on top of the RTEMS IO manager. |
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5 | * |
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6 | * These provide UNIX-like read and write calls for the C library. |
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7 | * |
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8 | * COPYRIGHT (c) 1994 by Division Incorporated |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.OARcorp.com/rtems/license.html. |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | #include <bsp.h> |
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18 | #include <rtems/libio.h> |
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19 | |
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20 | #include <errno.h> |
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21 | |
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22 | #define PRINT_BUFFER_SIZE (16 * 1024) |
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23 | |
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24 | /* |
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25 | * NOTE: this structure is dumplicated in print_dump.c utility |
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26 | */ |
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27 | |
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28 | struct { |
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29 | int index; |
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30 | int size; |
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31 | char buffer[PRINT_BUFFER_SIZE]; |
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32 | } print_buffer; |
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33 | |
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34 | /* always use printf buffer if non-zero */ |
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35 | int use_print_buffer; |
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36 | |
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37 | static int host_read_syscall(int fd, char *buffer, int count); |
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38 | static int host_write_syscall(int fd, char *buffer, int count); |
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39 | |
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40 | rtems_device_driver |
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41 | console_initialize( |
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42 | rtems_device_major_number major, |
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43 | rtems_device_minor_number minor, |
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44 | void * arg |
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45 | ) |
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46 | { |
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47 | rtems_status_code status; |
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48 | |
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49 | status = rtems_io_register_name("/dev/tty00", |
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50 | major, |
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51 | (rtems_device_minor_number) 0); |
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52 | if (status != RTEMS_SUCCESSFUL) |
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53 | rtems_fatal_error_occurred(status); |
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54 | |
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55 | return RTEMS_SUCCESSFUL; |
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56 | } |
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57 | |
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58 | rtems_device_driver |
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59 | console_open( |
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60 | rtems_device_major_number major, |
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61 | rtems_device_minor_number minor, |
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62 | void * arg |
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63 | ) |
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64 | { |
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65 | return RTEMS_SUCCESSFUL; |
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66 | } |
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67 | |
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68 | rtems_device_driver |
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69 | console_close( |
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70 | rtems_device_major_number major, |
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71 | rtems_device_minor_number minor, |
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72 | void * arg |
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73 | ) |
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74 | { |
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75 | return RTEMS_SUCCESSFUL; |
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76 | } |
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77 | |
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78 | rtems_device_driver |
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79 | console_control( |
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80 | rtems_device_major_number major, |
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81 | rtems_device_minor_number minor, |
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82 | void * arg |
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83 | ) |
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84 | { |
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85 | return RTEMS_SUCCESSFUL; |
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86 | } |
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87 | |
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88 | |
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89 | rtems_device_driver |
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90 | console_read( |
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91 | rtems_device_major_number major, |
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92 | rtems_device_minor_number minor, |
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93 | void * arg |
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94 | ) |
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95 | { |
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96 | rtems_libio_rw_args_t *rw_args; |
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97 | int count = 0; |
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98 | |
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99 | rw_args = (rtems_libio_rw_args_t *) arg; |
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100 | |
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101 | /* |
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102 | * If we are printing to a buffer, then just return newline on all |
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103 | * read's. If we return 0 bytes read, then the pause() calls in |
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104 | * the RTEMS tests get hosed (pause() does a gets()) |
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105 | */ |
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106 | |
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107 | if ( use_print_buffer ) |
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108 | { |
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109 | *rw_args->buffer = '\n'; |
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110 | count = 1; |
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111 | } |
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112 | else |
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113 | { |
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114 | count = host_read_syscall(0, rw_args->buffer, rw_args->count); |
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115 | } |
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116 | |
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117 | if (count >= 0) |
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118 | { |
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119 | rw_args->bytes_moved = count; |
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120 | return RTEMS_SUCCESSFUL; |
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121 | } |
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122 | return RTEMS_UNSATISFIED; |
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123 | } |
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124 | |
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125 | rtems_device_driver |
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126 | console_write( |
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127 | rtems_device_major_number major, |
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128 | rtems_device_minor_number minor, |
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129 | void * arg |
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130 | ) |
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131 | { |
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132 | unsigned32 level; |
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133 | rtems_libio_rw_args_t *rw_args; |
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134 | int count = 0; |
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135 | int fd = 1; /* XXX fixme; needs to be saved in iop */ |
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136 | |
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137 | rw_args = (rtems_libio_rw_args_t *) arg; |
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138 | |
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139 | /* |
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140 | * HACK alert |
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141 | * |
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142 | * Some of the simulators have real problems when multi cpu and |
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143 | * using the system calls. Until this is fixed, if we are multi |
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144 | * cpu then we write to a printf buffer |
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145 | */ |
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146 | |
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147 | if ( use_print_buffer ) |
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148 | { |
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149 | /* save size in memory for dumper */ |
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150 | if (print_buffer.size == 0) |
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151 | print_buffer.size = PRINT_BUFFER_SIZE; |
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152 | |
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153 | while (rw_args->count-- > 0) |
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154 | { |
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155 | rtems_interrupt_disable(level); |
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156 | print_buffer.buffer[print_buffer.index] = *rw_args->buffer++; |
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157 | print_buffer.index++; |
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158 | print_buffer.index &= (PRINT_BUFFER_SIZE - 1); |
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159 | print_buffer.buffer[print_buffer.index] = 0; |
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160 | rtems_interrupt_enable(level); |
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161 | count++; |
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162 | } |
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163 | } |
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164 | else |
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165 | { |
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166 | #if 1 |
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167 | /* |
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168 | * if on a multi cpu system and writing to stdout, redirect to stderr |
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169 | * so we can keep them separate |
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170 | */ |
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171 | |
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172 | if ((cpu_number == 1) && (fd == 1)) |
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173 | fd = 2; |
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174 | #endif |
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175 | count = host_write_syscall(fd, rw_args->buffer, rw_args->count); |
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176 | } |
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177 | |
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178 | if (count >= 0) |
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179 | { |
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180 | rw_args->bytes_moved = count; |
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181 | return RTEMS_SUCCESSFUL; |
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182 | } |
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183 | return RTEMS_UNSATISFIED; |
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184 | } |
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185 | |
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186 | |
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187 | /* |
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188 | * Host system call hack. |
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189 | * This little trick gets all the args in the right registers |
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190 | * for the system call and permits simpler inline asm. |
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191 | * Since this whole thing (syscalls under simulator) is a hack, |
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192 | * this little bit more is not going to hurt anything. |
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193 | */ |
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194 | |
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195 | |
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196 | static int |
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197 | host_read_syscall( |
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198 | int fd, |
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199 | char *buffer, |
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200 | int count |
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201 | ) |
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202 | { |
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203 | unsigned32 level; |
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204 | int rc; |
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205 | |
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206 | rtems_interrupt_disable(level); |
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207 | |
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208 | /* This is an HPUX system call, with return value copied out */ |
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209 | asm volatile (" stw %%r19,-28(0,%%r30)\n\ |
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210 | ldil L%%0xc0000000,%%r1\n\ |
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211 | ble 4(7,%%r1)\n\ |
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212 | ldi 3,%%r22\n\ |
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213 | ldw -28(0,%%r30),%%r19\n\ |
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214 | copy %%r28, %0" |
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215 | : "=r" (rc) |
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216 | : ); |
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217 | |
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218 | rtems_interrupt_enable(level); |
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219 | return rc; |
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220 | } |
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221 | |
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222 | static int |
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223 | host_write_syscall( |
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224 | int fd, |
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225 | char *buffer, |
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226 | int count |
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227 | ) |
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228 | { |
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229 | unsigned32 level; |
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230 | int rc; |
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231 | |
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232 | rtems_interrupt_disable(level); |
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233 | |
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234 | /* This is an HPUX system call, with return value copied out */ |
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235 | asm volatile (" stw %%r19,-28(0,%%r30)\n\ |
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236 | ldil L%%0xc0000000,%%r1\n\ |
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237 | ble 4(7,%%r1)\n\ |
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238 | ldi 4,%%r22\n\ |
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239 | ldw -28(0,%%r30),%%r19\n\ |
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240 | copy %%r28, %0" |
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241 | : "=r" (rc) |
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242 | : ); |
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243 | |
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244 | rtems_interrupt_enable(level); |
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245 | return rc; |
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246 | } |
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247 | |
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