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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 | /****************************************************************************** * * Module Name: amsystem - Interface to OS services * *****************************************************************************/ /* * Copyright (C) 2000 R. Byron Moore * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "acpi.h" #include "interp.h" #include "namesp.h" #include "hardware.h" #include "events.h" #define _COMPONENT INTERPRETER MODULE_NAME ("amsystem"); /******************************************************************************* * * FUNCTION: Acpi_aml_system_thread_id * * PARAMETERS: None * * RETURN: Current Thread ID (for this implementation a 1 is returned) * * DESCRIPTION: An invocation is identified by its Thread ID. In a single * threaded OS the Thread ID is undefined so a 1 will be * returned. * ******************************************************************************/ u16 acpi_aml_system_thread_id (void) { return (1); } /******************************************************************************* * * FUNCTION: Acpi_aml_system_wait_semaphore * * PARAMETERS: Semaphore - OSD semaphore to wait on * Timeout - Max time to wait * * RETURN: Status * * DESCRIPTION: Implements a semaphore wait with a check to see if the * semaphore is available immediately. If it is not, the * interpreter is released. * ******************************************************************************/ ACPI_STATUS acpi_aml_system_wait_semaphore ( ACPI_HANDLE semaphore, u32 timeout) { ACPI_STATUS status; status = acpi_os_wait_semaphore (semaphore, 1, 0); if (ACPI_SUCCESS (status)) { return (status); } if (status == AE_TIME) { /* We must wait, so unlock the interpreter */ acpi_aml_exit_interpreter (); status = acpi_os_wait_semaphore (semaphore, 1, timeout); /* Reacquire the interpreter */ acpi_aml_enter_interpreter (); } return (status); } /******************************************************************************* * * FUNCTION: Acpi_aml_system_do_stall * * PARAMETERS: How_long - The amount of time to stall * * RETURN: None * * DESCRIPTION: Suspend running thread for specified amount of time. * ******************************************************************************/ void acpi_aml_system_do_stall ( u32 how_long) { if (how_long > 1000) /* 1 millisecond */ { /* Since this thread will sleep, we must release the interpreter */ acpi_aml_exit_interpreter (); acpi_os_sleep_usec (how_long); /* And now we must get the interpreter again */ acpi_aml_enter_interpreter (); } else { acpi_os_sleep_usec (how_long); } } /******************************************************************************* * * FUNCTION: Acpi_aml_system_do_suspend * * PARAMETERS: How_long - The amount of time to suspend * * RETURN: None * * DESCRIPTION: Suspend running thread for specified amount of time. * ******************************************************************************/ void acpi_aml_system_do_suspend ( u32 how_long) { /* Since this thread will sleep, we must release the interpreter */ acpi_aml_exit_interpreter (); acpi_os_sleep ((u16) (how_long / (u32) 1000), (u16) (how_long % (u32) 1000)); /* And now we must get the interpreter again */ acpi_aml_enter_interpreter (); } /******************************************************************************* * * FUNCTION: Acpi_aml_system_acquire_mutex * * PARAMETERS: *Time_desc - The 'time to delay' object descriptor * *Obj_desc - The object descriptor for this op * * RETURN: Status * * DESCRIPTION: Provides an access point to perform synchronization operations * within the AML. This function will cause a lock to be generated * for the Mutex pointed to by Obj_desc. * ******************************************************************************/ ACPI_STATUS acpi_aml_system_acquire_mutex ( ACPI_OBJECT_INTERNAL *time_desc, ACPI_OBJECT_INTERNAL *obj_desc) { ACPI_STATUS status = AE_OK; if (!obj_desc) { return (AE_BAD_PARAMETER); } /* * Support for the _GL_ Mutex object -- go get the global lock */ if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) { status = acpi_ev_acquire_global_lock (); return (status); } status = acpi_aml_system_wait_semaphore (obj_desc->mutex.semaphore, time_desc->number.value); return (status); } /******************************************************************************* * * FUNCTION: Acpi_aml_system_release_mutex * * PARAMETERS: *Obj_desc - The object descriptor for this op * * RETURN: Status * * DESCRIPTION: Provides an access point to perform synchronization operations * within the AML. This operation is a request to release a * previously acquired Mutex. If the Mutex variable is set then * it will be decremented. * ******************************************************************************/ ACPI_STATUS acpi_aml_system_release_mutex ( ACPI_OBJECT_INTERNAL *obj_desc) { ACPI_STATUS status = AE_OK; if (!obj_desc) { return (AE_BAD_PARAMETER); } /* * Support for the _GL_ Mutex object -- release the global lock */ if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) { acpi_ev_release_global_lock (); return (AE_OK); } status = acpi_os_signal_semaphore (obj_desc->mutex.semaphore, 1); return (status); } /******************************************************************************* * * FUNCTION: Acpi_aml_system_signal_event * * PARAMETERS: *Obj_desc - The object descriptor for this op * * RETURN: AE_OK * * DESCRIPTION: Provides an access point to perform synchronization operations * within the AML. * ******************************************************************************/ ACPI_STATUS acpi_aml_system_signal_event ( ACPI_OBJECT_INTERNAL *obj_desc) { ACPI_STATUS status = AE_OK; if (obj_desc) { status = acpi_os_signal_semaphore (obj_desc->event.semaphore, 1); } return (status); } /******************************************************************************* * * FUNCTION: Acpi_aml_system_wait_event * * PARAMETERS: *Time_desc - The 'time to delay' object descriptor * *Obj_desc - The object descriptor for this op * * RETURN: Status * * DESCRIPTION: Provides an access point to perform synchronization operations * within the AML. This operation is a request to wait for an * event. * ******************************************************************************/ ACPI_STATUS acpi_aml_system_wait_event ( ACPI_OBJECT_INTERNAL *time_desc, ACPI_OBJECT_INTERNAL *obj_desc) { ACPI_STATUS status = AE_OK; if (obj_desc) { status = acpi_aml_system_wait_semaphore (obj_desc->event.semaphore, time_desc->number.value); } return (status); } /******************************************************************************* * * FUNCTION: Acpi_aml_system_reset_event * * PARAMETERS: *Obj_desc - The object descriptor for this op * * RETURN: Status * * DESCRIPTION: Provides an access point to perform synchronization operations * within the AML. * ******************************************************************************/ ACPI_STATUS acpi_aml_system_reset_event ( ACPI_OBJECT_INTERNAL *obj_desc) { ACPI_STATUS status = AE_OK; void *temp_semaphore; /* * We are going to simply delete the existing semaphore and * create a new one! */ status = acpi_os_create_semaphore (ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore); if (ACPI_SUCCESS (status)) { acpi_os_delete_semaphore (obj_desc->mutex.semaphore); obj_desc->mutex.semaphore = temp_semaphore; } return (status); } |