1 /******************************************************************************
3 * Module Name: dscontrol - Support for execution control opcodes -
6 *****************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999 - 2011, 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 *****************************************************************************/
117 #define __DSCONTROL_C__
120 #include "accommon.h"
122 #include "acdispat.h"
123 #include "acinterp.h"
125 #define _COMPONENT ACPI_DISPATCHER
126 ACPI_MODULE_NAME ("dscontrol")
129 /*******************************************************************************
131 * FUNCTION: AcpiDsExecBeginControlOp
133 * PARAMETERS: WalkList - The list that owns the walk stack
134 * Op - The control Op
138 * DESCRIPTION: Handles all control ops encountered during control method
141 ******************************************************************************/
144 AcpiDsExecBeginControlOp (
145 ACPI_WALK_STATE *WalkState,
146 ACPI_PARSE_OBJECT *Op)
148 ACPI_STATUS Status = AE_OK;
149 ACPI_GENERIC_STATE *ControlState;
152 ACPI_FUNCTION_NAME (DsExecBeginControlOp);
155 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n",
156 Op, Op->Common.AmlOpcode, WalkState));
158 switch (Op->Common.AmlOpcode)
163 * If this is an additional iteration of a while loop, continue.
164 * There is no need to allocate a new control state.
166 if (WalkState->ControlState)
168 if (WalkState->ControlState->Control.AmlPredicateStart ==
169 (WalkState->ParserState.Aml - 1))
171 /* Reset the state to start-of-loop */
173 WalkState->ControlState->Common.State =
174 ACPI_CONTROL_CONDITIONAL_EXECUTING;
179 /*lint -fallthrough */
184 * IF/WHILE: Create a new control state to manage these
185 * constructs. We need to manage these as a stack, in order
188 ControlState = AcpiUtCreateControlState ();
191 Status = AE_NO_MEMORY;
195 * Save a pointer to the predicate for multiple executions
198 ControlState->Control.AmlPredicateStart = WalkState->ParserState.Aml - 1;
199 ControlState->Control.PackageEnd = WalkState->ParserState.PkgEnd;
200 ControlState->Control.Opcode = Op->Common.AmlOpcode;
203 /* Push the control state on this walk's control stack */
205 AcpiUtPushGenericState (&WalkState->ControlState, ControlState);
210 /* Predicate is in the state object */
211 /* If predicate is true, the IF was executed, ignore ELSE part */
213 if (WalkState->LastPredicate)
215 Status = AE_CTRL_TRUE;
232 /*******************************************************************************
234 * FUNCTION: AcpiDsExecEndControlOp
236 * PARAMETERS: WalkList - The list that owns the walk stack
237 * Op - The control Op
241 * DESCRIPTION: Handles all control ops encountered during control method
244 ******************************************************************************/
247 AcpiDsExecEndControlOp (
248 ACPI_WALK_STATE *WalkState,
249 ACPI_PARSE_OBJECT *Op)
251 ACPI_STATUS Status = AE_OK;
252 ACPI_GENERIC_STATE *ControlState;
255 ACPI_FUNCTION_NAME (DsExecEndControlOp);
258 switch (Op->Common.AmlOpcode)
262 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", Op));
265 * Save the result of the predicate in case there is an
268 WalkState->LastPredicate =
269 (BOOLEAN) WalkState->ControlState->Common.Value;
272 * Pop the control state that was created at the start
273 * of the IF and free it
275 ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
276 AcpiUtDeleteGenericState (ControlState);
287 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", Op));
289 ControlState = WalkState->ControlState;
290 if (ControlState->Common.Value)
292 /* Predicate was true, the body of the loop was just executed */
295 * This loop counter mechanism allows the interpreter to escape
296 * possibly infinite loops. This can occur in poorly written AML
297 * when the hardware does not respond within a while loop and the
298 * loop does not implement a timeout.
300 ControlState->Control.LoopCount++;
301 if (ControlState->Control.LoopCount > ACPI_MAX_LOOP_ITERATIONS)
303 Status = AE_AML_INFINITE_LOOP;
308 * Go back and evaluate the predicate and maybe execute the loop
311 Status = AE_CTRL_PENDING;
312 WalkState->AmlLastWhile = ControlState->Control.AmlPredicateStart;
316 /* Predicate was false, terminate this while loop */
318 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
319 "[WHILE_OP] termination! Op=%p\n",Op));
321 /* Pop this control state and free it */
323 ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
324 AcpiUtDeleteGenericState (ControlState);
330 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
331 "[RETURN_OP] Op=%p Arg=%p\n",Op, Op->Common.Value.Arg));
334 * One optional operand -- the return value
335 * It can be either an immediate operand or a result that
336 * has been bubbled up the tree
338 if (Op->Common.Value.Arg)
340 /* Since we have a real Return(), delete any implicit return */
342 AcpiDsClearImplicitReturn (WalkState);
344 /* Return statement has an immediate operand */
346 Status = AcpiDsCreateOperands (WalkState, Op->Common.Value.Arg);
347 if (ACPI_FAILURE (Status))
353 * If value being returned is a Reference (such as
354 * an arg or local), resolve it now because it may
355 * cease to exist at the end of the method.
357 Status = AcpiExResolveToValue (&WalkState->Operands [0], WalkState);
358 if (ACPI_FAILURE (Status))
364 * Get the return value and save as the last result
365 * value. This is the only place where WalkState->ReturnDesc
366 * is set to anything other than zero!
368 WalkState->ReturnDesc = WalkState->Operands[0];
370 else if (WalkState->ResultCount)
372 /* Since we have a real Return(), delete any implicit return */
374 AcpiDsClearImplicitReturn (WalkState);
377 * The return value has come from a previous calculation.
379 * If value being returned is a Reference (such as
380 * an arg or local), resolve it now because it may
381 * cease to exist at the end of the method.
383 * Allow references created by the Index operator to return
386 if ((ACPI_GET_DESCRIPTOR_TYPE (WalkState->Results->Results.ObjDesc[0]) == ACPI_DESC_TYPE_OPERAND) &&
387 ((WalkState->Results->Results.ObjDesc [0])->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
388 ((WalkState->Results->Results.ObjDesc [0])->Reference.Class != ACPI_REFCLASS_INDEX))
390 Status = AcpiExResolveToValue (&WalkState->Results->Results.ObjDesc [0], WalkState);
391 if (ACPI_FAILURE (Status))
397 WalkState->ReturnDesc = WalkState->Results->Results.ObjDesc [0];
401 /* No return operand */
403 if (WalkState->NumOperands)
405 AcpiUtRemoveReference (WalkState->Operands [0]);
408 WalkState->Operands [0] = NULL;
409 WalkState->NumOperands = 0;
410 WalkState->ReturnDesc = NULL;
414 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
415 "Completed RETURN_OP State=%p, RetVal=%p\n",
416 WalkState, WalkState->ReturnDesc));
418 /* End the control method execution right now */
420 Status = AE_CTRL_TERMINATE;
426 /* Just do nothing! */
430 case AML_BREAK_POINT_OP:
433 * Set the single-step flag. This will cause the debugger (if present)
434 * to break to the console within the AML debugger at the start of the
435 * next AML instruction.
438 AcpiGbl_CmSingleStep = TRUE);
440 AcpiOsPrintf ("**break** Executed AML BreakPoint opcode\n"));
442 /* Call to the OSL in case OS wants a piece of the action */
444 Status = AcpiOsSignal (ACPI_SIGNAL_BREAKPOINT,
445 "Executed AML Breakpoint opcode");
450 case AML_CONTINUE_OP: /* ACPI 2.0 */
453 /* Pop and delete control states until we find a while */
455 while (WalkState->ControlState &&
456 (WalkState->ControlState->Control.Opcode != AML_WHILE_OP))
458 ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
459 AcpiUtDeleteGenericState (ControlState);
462 /* No while found? */
464 if (!WalkState->ControlState)
466 return (AE_AML_NO_WHILE);
469 /* Was: WalkState->AmlLastWhile = WalkState->ControlState->Control.AmlPredicateStart; */
471 WalkState->AmlLastWhile = WalkState->ControlState->Control.PackageEnd;
473 /* Return status depending on opcode */
475 if (Op->Common.AmlOpcode == AML_BREAK_OP)
477 Status = AE_CTRL_BREAK;
481 Status = AE_CTRL_CONTINUE;
488 ACPI_ERROR ((AE_INFO, "Unknown control opcode=0x%X Op=%p",
489 Op->Common.AmlOpcode, Op));
491 Status = AE_AML_BAD_OPCODE;