| 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: exsystem - Interface to OS services |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
| 9 | * All rights reserved. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions, and the following disclaimer, |
| 16 | * without modification. |
| 17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| 18 | * substantially similar to the "NO WARRANTY" disclaimer below |
| 19 | * ("Disclaimer") and any redistribution must be conditioned upon |
| 20 | * including a substantially similar Disclaimer requirement for further |
| 21 | * binary redistribution. |
| 22 | * 3. Neither the names of the above-listed copyright holders nor the names |
| 23 | * of any contributors may be used to endorse or promote products derived |
| 24 | * from this software without specific prior written permission. |
| 25 | * |
| 26 | * Alternatively, this software may be distributed under the terms of the |
| 27 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 28 | * Software Foundation. |
| 29 | * |
| 30 | * NO WARRANTY |
| 31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| 34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 41 | * POSSIBILITY OF SUCH DAMAGES. |
| 42 | */ |
| 43 | |
| 44 | #include "acpi.h" |
| 45 | #include "accommon.h" |
| 46 | #include "acinterp.h" |
| 47 | |
| 48 | #define _COMPONENT ACPI_EXECUTER |
| 49 | ACPI_MODULE_NAME ("exsystem" ) |
| 50 | |
| 51 | |
| 52 | /******************************************************************************* |
| 53 | * |
| 54 | * FUNCTION: AcpiExSystemWaitSemaphore |
| 55 | * |
| 56 | * PARAMETERS: Semaphore - Semaphore to wait on |
| 57 | * Timeout - Max time to wait |
| 58 | * |
| 59 | * RETURN: Status |
| 60 | * |
| 61 | * DESCRIPTION: Implements a semaphore wait with a check to see if the |
| 62 | * semaphore is available immediately. If it is not, the |
| 63 | * interpreter is released before waiting. |
| 64 | * |
| 65 | ******************************************************************************/ |
| 66 | |
| 67 | ACPI_STATUS |
| 68 | AcpiExSystemWaitSemaphore ( |
| 69 | ACPI_SEMAPHORE Semaphore, |
| 70 | UINT16 Timeout) |
| 71 | { |
| 72 | ACPI_STATUS Status; |
| 73 | |
| 74 | |
| 75 | ACPI_FUNCTION_TRACE (ExSystemWaitSemaphore); |
| 76 | |
| 77 | |
| 78 | Status = AcpiOsWaitSemaphore (Semaphore, 1, ACPI_DO_NOT_WAIT); |
| 79 | if (ACPI_SUCCESS (Status)) |
| 80 | { |
| 81 | return_ACPI_STATUS (Status); |
| 82 | } |
| 83 | |
| 84 | if (Status == AE_TIME) |
| 85 | { |
| 86 | /* We must wait, so unlock the interpreter */ |
| 87 | |
| 88 | AcpiExExitInterpreter (); |
| 89 | Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout); |
| 90 | |
| 91 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 92 | "*** Thread awake after blocking, %s\n" , |
| 93 | AcpiFormatException (Status))); |
| 94 | |
| 95 | /* Reacquire the interpreter */ |
| 96 | |
| 97 | AcpiExEnterInterpreter (); |
| 98 | } |
| 99 | |
| 100 | return_ACPI_STATUS (Status); |
| 101 | } |
| 102 | |
| 103 | |
| 104 | /******************************************************************************* |
| 105 | * |
| 106 | * FUNCTION: AcpiExSystemWaitMutex |
| 107 | * |
| 108 | * PARAMETERS: Mutex - Mutex to wait on |
| 109 | * Timeout - Max time to wait |
| 110 | * |
| 111 | * RETURN: Status |
| 112 | * |
| 113 | * DESCRIPTION: Implements a mutex wait with a check to see if the |
| 114 | * mutex is available immediately. If it is not, the |
| 115 | * interpreter is released before waiting. |
| 116 | * |
| 117 | ******************************************************************************/ |
| 118 | |
| 119 | ACPI_STATUS |
| 120 | AcpiExSystemWaitMutex ( |
| 121 | ACPI_MUTEX Mutex, |
| 122 | UINT16 Timeout) |
| 123 | { |
| 124 | ACPI_STATUS Status; |
| 125 | |
| 126 | |
| 127 | ACPI_FUNCTION_TRACE (ExSystemWaitMutex); |
| 128 | |
| 129 | |
| 130 | Status = AcpiOsAcquireMutex (Mutex, ACPI_DO_NOT_WAIT); |
| 131 | if (ACPI_SUCCESS (Status)) |
| 132 | { |
| 133 | return_ACPI_STATUS (Status); |
| 134 | } |
| 135 | |
| 136 | if (Status == AE_TIME) |
| 137 | { |
| 138 | /* We must wait, so unlock the interpreter */ |
| 139 | |
| 140 | AcpiExExitInterpreter (); |
| 141 | Status = AcpiOsAcquireMutex (Mutex, Timeout); |
| 142 | |
| 143 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 144 | "*** Thread awake after blocking, %s\n" , |
| 145 | AcpiFormatException (Status))); |
| 146 | |
| 147 | /* Reacquire the interpreter */ |
| 148 | |
| 149 | AcpiExEnterInterpreter (); |
| 150 | } |
| 151 | |
| 152 | return_ACPI_STATUS (Status); |
| 153 | } |
| 154 | |
| 155 | |
| 156 | /******************************************************************************* |
| 157 | * |
| 158 | * FUNCTION: AcpiExSystemDoStall |
| 159 | * |
| 160 | * PARAMETERS: HowLong - The amount of time to stall, |
| 161 | * in microseconds |
| 162 | * |
| 163 | * RETURN: Status |
| 164 | * |
| 165 | * DESCRIPTION: Suspend running thread for specified amount of time. |
| 166 | * Note: ACPI specification requires that Stall() does not |
| 167 | * relinquish the processor, and delays longer than 100 usec |
| 168 | * should use Sleep() instead. We allow stalls up to 255 usec |
| 169 | * for compatibility with other interpreters and existing BIOSs. |
| 170 | * |
| 171 | ******************************************************************************/ |
| 172 | |
| 173 | ACPI_STATUS |
| 174 | AcpiExSystemDoStall ( |
| 175 | UINT32 HowLong) |
| 176 | { |
| 177 | ACPI_STATUS Status = AE_OK; |
| 178 | |
| 179 | |
| 180 | ACPI_FUNCTION_ENTRY (); |
| 181 | |
| 182 | |
| 183 | if (HowLong > 255) /* 255 microseconds */ |
| 184 | { |
| 185 | /* |
| 186 | * Longer than 255 usec, this is an error |
| 187 | * |
| 188 | * (ACPI specifies 100 usec as max, but this gives some slack in |
| 189 | * order to support existing BIOSs) |
| 190 | */ |
| 191 | ACPI_ERROR ((AE_INFO, |
| 192 | "Time parameter is too large (%u)" , HowLong)); |
| 193 | Status = AE_AML_OPERAND_VALUE; |
| 194 | } |
| 195 | else |
| 196 | { |
| 197 | AcpiOsStall (HowLong); |
| 198 | } |
| 199 | |
| 200 | return (Status); |
| 201 | } |
| 202 | |
| 203 | |
| 204 | /******************************************************************************* |
| 205 | * |
| 206 | * FUNCTION: AcpiExSystemDoSleep |
| 207 | * |
| 208 | * PARAMETERS: HowLong - The amount of time to sleep, |
| 209 | * in milliseconds |
| 210 | * |
| 211 | * RETURN: None |
| 212 | * |
| 213 | * DESCRIPTION: Sleep the running thread for specified amount of time. |
| 214 | * |
| 215 | ******************************************************************************/ |
| 216 | |
| 217 | ACPI_STATUS |
| 218 | AcpiExSystemDoSleep ( |
| 219 | UINT64 HowLong) |
| 220 | { |
| 221 | ACPI_FUNCTION_ENTRY (); |
| 222 | |
| 223 | |
| 224 | /* Since this thread will sleep, we must release the interpreter */ |
| 225 | |
| 226 | AcpiExExitInterpreter (); |
| 227 | |
| 228 | /* |
| 229 | * For compatibility with other ACPI implementations and to prevent |
| 230 | * accidental deep sleeps, limit the sleep time to something reasonable. |
| 231 | */ |
| 232 | if (HowLong > ACPI_MAX_SLEEP) |
| 233 | { |
| 234 | HowLong = ACPI_MAX_SLEEP; |
| 235 | } |
| 236 | |
| 237 | AcpiOsSleep (HowLong); |
| 238 | |
| 239 | /* And now we must get the interpreter again */ |
| 240 | |
| 241 | AcpiExEnterInterpreter (); |
| 242 | return (AE_OK); |
| 243 | } |
| 244 | |
| 245 | |
| 246 | /******************************************************************************* |
| 247 | * |
| 248 | * FUNCTION: AcpiExSystemSignalEvent |
| 249 | * |
| 250 | * PARAMETERS: ObjDesc - The object descriptor for this op |
| 251 | * |
| 252 | * RETURN: Status |
| 253 | * |
| 254 | * DESCRIPTION: Provides an access point to perform synchronization operations |
| 255 | * within the AML. |
| 256 | * |
| 257 | ******************************************************************************/ |
| 258 | |
| 259 | ACPI_STATUS |
| 260 | AcpiExSystemSignalEvent ( |
| 261 | ACPI_OPERAND_OBJECT *ObjDesc) |
| 262 | { |
| 263 | ACPI_STATUS Status = AE_OK; |
| 264 | |
| 265 | |
| 266 | ACPI_FUNCTION_TRACE (ExSystemSignalEvent); |
| 267 | |
| 268 | |
| 269 | if (ObjDesc) |
| 270 | { |
| 271 | Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1); |
| 272 | } |
| 273 | |
| 274 | return_ACPI_STATUS (Status); |
| 275 | } |
| 276 | |
| 277 | |
| 278 | /******************************************************************************* |
| 279 | * |
| 280 | * FUNCTION: AcpiExSystemWaitEvent |
| 281 | * |
| 282 | * PARAMETERS: TimeDesc - The 'time to delay' object descriptor |
| 283 | * ObjDesc - The object descriptor for this op |
| 284 | * |
| 285 | * RETURN: Status |
| 286 | * |
| 287 | * DESCRIPTION: Provides an access point to perform synchronization operations |
| 288 | * within the AML. This operation is a request to wait for an |
| 289 | * event. |
| 290 | * |
| 291 | ******************************************************************************/ |
| 292 | |
| 293 | ACPI_STATUS |
| 294 | AcpiExSystemWaitEvent ( |
| 295 | ACPI_OPERAND_OBJECT *TimeDesc, |
| 296 | ACPI_OPERAND_OBJECT *ObjDesc) |
| 297 | { |
| 298 | ACPI_STATUS Status = AE_OK; |
| 299 | |
| 300 | |
| 301 | ACPI_FUNCTION_TRACE (ExSystemWaitEvent); |
| 302 | |
| 303 | |
| 304 | if (ObjDesc) |
| 305 | { |
| 306 | Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore, |
| 307 | (UINT16) TimeDesc->Integer.Value); |
| 308 | } |
| 309 | |
| 310 | return_ACPI_STATUS (Status); |
| 311 | } |
| 312 | |
| 313 | |
| 314 | /******************************************************************************* |
| 315 | * |
| 316 | * FUNCTION: AcpiExSystemResetEvent |
| 317 | * |
| 318 | * PARAMETERS: ObjDesc - The object descriptor for this op |
| 319 | * |
| 320 | * RETURN: Status |
| 321 | * |
| 322 | * DESCRIPTION: Reset an event to a known state. |
| 323 | * |
| 324 | ******************************************************************************/ |
| 325 | |
| 326 | ACPI_STATUS |
| 327 | AcpiExSystemResetEvent ( |
| 328 | ACPI_OPERAND_OBJECT *ObjDesc) |
| 329 | { |
| 330 | ACPI_STATUS Status = AE_OK; |
| 331 | ACPI_SEMAPHORE TempSemaphore; |
| 332 | |
| 333 | |
| 334 | ACPI_FUNCTION_ENTRY (); |
| 335 | |
| 336 | |
| 337 | /* |
| 338 | * We are going to simply delete the existing semaphore and |
| 339 | * create a new one! |
| 340 | */ |
| 341 | Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore); |
| 342 | if (ACPI_SUCCESS (Status)) |
| 343 | { |
| 344 | (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore); |
| 345 | ObjDesc->Event.OsSemaphore = TempSemaphore; |
| 346 | } |
| 347 | |
| 348 | return (Status); |
| 349 | } |
| 350 | |