1 /******************************************************************************
3 * Module Name: dscontrol - Support for execution control opcodes -
6 *****************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999 - 2015, Intel Corp.
13 * All rights reserved.
17 * 2.1. This is your license from Intel Corp. under its intellectual property
18 * rights. You may have additional license terms from the party that provided
19 * you this software, covering your right to use that party's intellectual
22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
23 * copy of the source code appearing in this file ("Covered Code") an
24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
25 * base code distributed originally by Intel ("Original Intel Code") to copy,
26 * make derivatives, distribute, use and display any portion of the Covered
27 * Code in any form, with the right to sublicense such rights; and
29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
30 * license (with the right to sublicense), under only those claims of Intel
31 * patents that are infringed by the Original Intel Code, to make, use, sell,
32 * offer to sell, and import the Covered Code and derivative works thereof
33 * solely to the minimum extent necessary to exercise the above copyright
34 * license, and in no event shall the patent license extend to any additions
35 * to or modifications of the Original Intel Code. No other license or right
36 * is granted directly or by implication, estoppel or otherwise;
38 * The above copyright and patent license is granted only if the following
43 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
44 * Redistribution of source code of any substantial portion of the Covered
45 * Code or modification with rights to further distribute source must include
46 * the above Copyright Notice, the above License, this list of Conditions,
47 * and the following Disclaimer and Export Compliance provision. In addition,
48 * Licensee must cause all Covered Code to which Licensee contributes to
49 * contain a file documenting the changes Licensee made to create that Covered
50 * Code and the date of any change. Licensee must include in that file the
51 * documentation of any changes made by any predecessor Licensee. Licensee
52 * must include a prominent statement that the modification is derived,
53 * directly or indirectly, from Original Intel Code.
55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
56 * Redistribution of source code of any substantial portion of the Covered
57 * Code or modification without rights to further distribute source must
58 * include the following Disclaimer and Export Compliance provision in the
59 * documentation and/or other materials provided with distribution. In
60 * addition, Licensee may not authorize further sublicense of source of any
61 * portion of the Covered Code, and must include terms to the effect that the
62 * license from Licensee to its licensee is limited to the intellectual
63 * property embodied in the software Licensee provides to its licensee, and
64 * not to intellectual property embodied in modifications its licensee may
67 * 3.3. Redistribution of Executable. Redistribution in executable form of any
68 * substantial portion of the Covered Code or modification must reproduce the
69 * above Copyright Notice, and the following Disclaimer and Export Compliance
70 * provision in the documentation and/or other materials provided with the
73 * 3.4. Intel retains all right, title, and interest in and to the Original
76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77 * Intel shall be used in advertising or otherwise to promote the sale, use or
78 * other dealings in products derived from or relating to the Covered Code
79 * without prior written authorization from Intel.
81 * 4. Disclaimer and Export Compliance
83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
100 * 4.3. Licensee shall not export, either directly or indirectly, any of this
101 * software or system incorporating such software without first obtaining any
102 * required license or other approval from the U. S. Department of Commerce or
103 * any other agency or department of the United States Government. In the
104 * event Licensee exports any such software from the United States or
105 * re-exports any such software from a foreign destination, Licensee shall
106 * ensure that the distribution and export/re-export of the software is in
107 * compliance with all laws, regulations, orders, or other restrictions of the
108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109 * any of its subsidiaries will export/re-export any technical data, process,
110 * software, or service, directly or indirectly, to any country for which the
111 * United States government or any agency thereof requires an export license,
112 * other governmental approval, or letter of assurance, without first obtaining
113 * such license, approval or letter.
115 *****************************************************************************/
118 #include "accommon.h"
120 #include "acdispat.h"
121 #include "acinterp.h"
123 #define _COMPONENT ACPI_DISPATCHER
124 ACPI_MODULE_NAME ("dscontrol")
127 /*******************************************************************************
129 * FUNCTION: AcpiDsExecBeginControlOp
131 * PARAMETERS: WalkList - The list that owns the walk stack
132 * Op - The control Op
136 * DESCRIPTION: Handles all control ops encountered during control method
139 ******************************************************************************/
142 AcpiDsExecBeginControlOp (
143 ACPI_WALK_STATE *WalkState,
144 ACPI_PARSE_OBJECT *Op)
146 ACPI_STATUS Status = AE_OK;
147 ACPI_GENERIC_STATE *ControlState;
150 ACPI_FUNCTION_NAME (DsExecBeginControlOp);
153 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n",
154 Op, Op->Common.AmlOpcode, WalkState));
156 switch (Op->Common.AmlOpcode)
160 * If this is an additional iteration of a while loop, continue.
161 * There is no need to allocate a new control state.
163 if (WalkState->ControlState)
165 if (WalkState->ControlState->Control.AmlPredicateStart ==
166 (WalkState->ParserState.Aml - 1))
168 /* Reset the state to start-of-loop */
170 WalkState->ControlState->Common.State =
171 ACPI_CONTROL_CONDITIONAL_EXECUTING;
176 /*lint -fallthrough */
180 * IF/WHILE: Create a new control state to manage these
181 * constructs. We need to manage these as a stack, in order
184 ControlState = AcpiUtCreateControlState ();
187 Status = AE_NO_MEMORY;
191 * Save a pointer to the predicate for multiple executions
194 ControlState->Control.AmlPredicateStart = WalkState->ParserState.Aml - 1;
195 ControlState->Control.PackageEnd = WalkState->ParserState.PkgEnd;
196 ControlState->Control.Opcode = Op->Common.AmlOpcode;
199 /* Push the control state on this walk's control stack */
201 AcpiUtPushGenericState (&WalkState->ControlState, ControlState);
206 /* Predicate is in the state object */
207 /* If predicate is true, the IF was executed, ignore ELSE part */
209 if (WalkState->LastPredicate)
211 Status = AE_CTRL_TRUE;
229 /*******************************************************************************
231 * FUNCTION: AcpiDsExecEndControlOp
233 * PARAMETERS: WalkList - The list that owns the walk stack
234 * Op - The control Op
238 * DESCRIPTION: Handles all control ops encountered during control method
241 ******************************************************************************/
244 AcpiDsExecEndControlOp (
245 ACPI_WALK_STATE *WalkState,
246 ACPI_PARSE_OBJECT *Op)
248 ACPI_STATUS Status = AE_OK;
249 ACPI_GENERIC_STATE *ControlState;
252 ACPI_FUNCTION_NAME (DsExecEndControlOp);
255 switch (Op->Common.AmlOpcode)
259 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", Op));
262 * Save the result of the predicate in case there is an
265 WalkState->LastPredicate =
266 (BOOLEAN) WalkState->ControlState->Common.Value;
269 * Pop the control state that was created at the start
270 * of the IF and free it
272 ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
273 AcpiUtDeleteGenericState (ControlState);
282 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", Op));
284 ControlState = WalkState->ControlState;
285 if (ControlState->Common.Value)
287 /* Predicate was true, the body of the loop was just executed */
290 * This loop counter mechanism allows the interpreter to escape
291 * possibly infinite loops. This can occur in poorly written AML
292 * when the hardware does not respond within a while loop and the
293 * loop does not implement a timeout.
295 ControlState->Control.LoopCount++;
296 if (ControlState->Control.LoopCount > ACPI_MAX_LOOP_ITERATIONS)
298 Status = AE_AML_INFINITE_LOOP;
303 * Go back and evaluate the predicate and maybe execute the loop
306 Status = AE_CTRL_PENDING;
307 WalkState->AmlLastWhile = ControlState->Control.AmlPredicateStart;
311 /* Predicate was false, terminate this while loop */
313 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
314 "[WHILE_OP] termination! Op=%p\n",Op));
316 /* Pop this control state and free it */
318 ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
319 AcpiUtDeleteGenericState (ControlState);
324 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
325 "[RETURN_OP] Op=%p Arg=%p\n",Op, Op->Common.Value.Arg));
328 * One optional operand -- the return value
329 * It can be either an immediate operand or a result that
330 * has been bubbled up the tree
332 if (Op->Common.Value.Arg)
334 /* Since we have a real Return(), delete any implicit return */
336 AcpiDsClearImplicitReturn (WalkState);
338 /* Return statement has an immediate operand */
340 Status = AcpiDsCreateOperands (WalkState, Op->Common.Value.Arg);
341 if (ACPI_FAILURE (Status))
347 * If value being returned is a Reference (such as
348 * an arg or local), resolve it now because it may
349 * cease to exist at the end of the method.
351 Status = AcpiExResolveToValue (&WalkState->Operands [0], WalkState);
352 if (ACPI_FAILURE (Status))
358 * Get the return value and save as the last result
359 * value. This is the only place where WalkState->ReturnDesc
360 * is set to anything other than zero!
362 WalkState->ReturnDesc = WalkState->Operands[0];
364 else if (WalkState->ResultCount)
366 /* Since we have a real Return(), delete any implicit return */
368 AcpiDsClearImplicitReturn (WalkState);
371 * The return value has come from a previous calculation.
373 * If value being returned is a Reference (such as
374 * an arg or local), resolve it now because it may
375 * cease to exist at the end of the method.
377 * Allow references created by the Index operator to return
380 if ((ACPI_GET_DESCRIPTOR_TYPE (WalkState->Results->Results.ObjDesc[0]) == ACPI_DESC_TYPE_OPERAND) &&
381 ((WalkState->Results->Results.ObjDesc [0])->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
382 ((WalkState->Results->Results.ObjDesc [0])->Reference.Class != ACPI_REFCLASS_INDEX))
384 Status = AcpiExResolveToValue (&WalkState->Results->Results.ObjDesc [0], WalkState);
385 if (ACPI_FAILURE (Status))
391 WalkState->ReturnDesc = WalkState->Results->Results.ObjDesc [0];
395 /* No return operand */
397 if (WalkState->NumOperands)
399 AcpiUtRemoveReference (WalkState->Operands [0]);
402 WalkState->Operands [0] = NULL;
403 WalkState->NumOperands = 0;
404 WalkState->ReturnDesc = NULL;
408 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
409 "Completed RETURN_OP State=%p, RetVal=%p\n",
410 WalkState, WalkState->ReturnDesc));
412 /* End the control method execution right now */
414 Status = AE_CTRL_TERMINATE;
419 /* Just do nothing! */
423 case AML_BREAK_POINT_OP:
426 * Set the single-step flag. This will cause the debugger (if present)
427 * to break to the console within the AML debugger at the start of the
428 * next AML instruction.
431 AcpiGbl_CmSingleStep = TRUE);
433 AcpiOsPrintf ("**break** Executed AML BreakPoint opcode\n"));
435 /* Call to the OSL in case OS wants a piece of the action */
437 Status = AcpiOsSignal (ACPI_SIGNAL_BREAKPOINT,
438 "Executed AML Breakpoint opcode");
442 case AML_CONTINUE_OP: /* ACPI 2.0 */
444 /* Pop and delete control states until we find a while */
446 while (WalkState->ControlState &&
447 (WalkState->ControlState->Control.Opcode != AML_WHILE_OP))
449 ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
450 AcpiUtDeleteGenericState (ControlState);
453 /* No while found? */
455 if (!WalkState->ControlState)
457 return (AE_AML_NO_WHILE);
460 /* Was: WalkState->AmlLastWhile = WalkState->ControlState->Control.AmlPredicateStart; */
462 WalkState->AmlLastWhile = WalkState->ControlState->Control.PackageEnd;
464 /* Return status depending on opcode */
466 if (Op->Common.AmlOpcode == AML_BREAK_OP)
468 Status = AE_CTRL_BREAK;
472 Status = AE_CTRL_CONTINUE;
478 ACPI_ERROR ((AE_INFO, "Unknown control opcode=0x%X Op=%p",
479 Op->Common.AmlOpcode, Op));
481 Status = AE_AML_BAD_OPCODE;