1 /******************************************************************************
3 * Module Name: psxface - Parser external interfaces
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2016, Intel Corp.
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20 * including a substantially similar Disclaimer requirement for further
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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53 #define _COMPONENT ACPI_PARSER
54 ACPI_MODULE_NAME ("psxface")
56 /* Local Prototypes */
59 AcpiPsUpdateParameterList (
60 ACPI_EVALUATE_INFO *Info,
64 /*******************************************************************************
66 * FUNCTION: AcpiDebugTrace
68 * PARAMETERS: MethodName - Valid ACPI name string
69 * DebugLevel - Optional level mask. 0 to use default
70 * DebugLayer - Optional layer mask. 0 to use default
71 * Flags - bit 1: one shot(1) or persistent(0)
75 * DESCRIPTION: External interface to enable debug tracing during control
78 ******************************************************************************/
90 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
91 if (ACPI_FAILURE (Status))
96 AcpiGbl_TraceMethodName = Name;
97 AcpiGbl_TraceFlags = Flags;
98 AcpiGbl_TraceDbgLevel = DebugLevel;
99 AcpiGbl_TraceDbgLayer = DebugLayer;
102 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
107 /*******************************************************************************
109 * FUNCTION: AcpiPsExecuteMethod
111 * PARAMETERS: Info - Method info block, contains:
112 * Node - Method Node to execute
113 * ObjDesc - Method object
114 * Parameters - List of parameters to pass to the method,
115 * terminated by NULL. Params itself may be
116 * NULL if no parameters are being passed.
117 * ReturnObject - Where to put method's return value (if
118 * any). If NULL, no value is returned.
119 * ParameterType - Type of Parameter list
120 * ReturnObject - Where to put method's return value (if
121 * any). If NULL, no value is returned.
122 * PassNumber - Parse or execute pass
126 * DESCRIPTION: Execute a control method
128 ******************************************************************************/
131 AcpiPsExecuteMethod (
132 ACPI_EVALUATE_INFO *Info)
135 ACPI_PARSE_OBJECT *Op;
136 ACPI_WALK_STATE *WalkState;
139 ACPI_FUNCTION_TRACE (PsExecuteMethod);
142 /* Quick validation of DSDT header */
144 AcpiTbCheckDsdtHeader ();
146 /* Validate the Info and method Node */
148 if (!Info || !Info->Node)
150 return_ACPI_STATUS (AE_NULL_ENTRY);
153 /* Init for new method, wait on concurrency semaphore */
155 Status = AcpiDsBeginMethodExecution (Info->Node, Info->ObjDesc, NULL);
156 if (ACPI_FAILURE (Status))
158 return_ACPI_STATUS (Status);
162 * The caller "owns" the parameters, so give each one an extra reference
164 AcpiPsUpdateParameterList (Info, REF_INCREMENT);
167 * Execute the method. Performs parse simultaneously
169 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
170 "**** Begin Method Parse/Execute [%4.4s] **** Node=%p Obj=%p\n",
171 Info->Node->Name.Ascii, Info->Node, Info->ObjDesc));
173 /* Create and init a Root Node */
175 Op = AcpiPsCreateScopeOp (Info->ObjDesc->Method.AmlStart);
178 Status = AE_NO_MEMORY;
182 /* Create and initialize a new walk state */
184 Info->PassNumber = ACPI_IMODE_EXECUTE;
185 WalkState = AcpiDsCreateWalkState (
186 Info->ObjDesc->Method.OwnerId, NULL, NULL, NULL);
189 Status = AE_NO_MEMORY;
193 Status = AcpiDsInitAmlWalk (WalkState, Op, Info->Node,
194 Info->ObjDesc->Method.AmlStart,
195 Info->ObjDesc->Method.AmlLength, Info, Info->PassNumber);
196 if (ACPI_FAILURE (Status))
198 AcpiDsDeleteWalkState (WalkState);
202 if (Info->ObjDesc->Method.InfoFlags & ACPI_METHOD_MODULE_LEVEL)
204 WalkState->ParseFlags |= ACPI_PARSE_MODULE_LEVEL;
207 /* Invoke an internal method if necessary */
209 if (Info->ObjDesc->Method.InfoFlags & ACPI_METHOD_INTERNAL_ONLY)
211 Status = Info->ObjDesc->Method.Dispatch.Implementation (WalkState);
212 Info->ReturnObject = WalkState->ReturnDesc;
216 AcpiDsScopeStackClear (WalkState);
217 AcpiPsCleanupScope (&WalkState->ParserState);
218 AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
219 AcpiDsDeleteWalkState (WalkState);
224 * Start method evaluation with an implicit return of zero.
225 * This is done for Windows compatibility.
227 if (AcpiGbl_EnableInterpreterSlack)
229 WalkState->ImplicitReturnObj =
230 AcpiUtCreateIntegerObject ((UINT64) 0);
231 if (!WalkState->ImplicitReturnObj)
233 Status = AE_NO_MEMORY;
234 AcpiDsDeleteWalkState (WalkState);
241 Status = AcpiPsParseAml (WalkState);
243 /* WalkState was deleted by ParseAml */
246 AcpiPsDeleteParseTree (Op);
248 /* Take away the extra reference that we gave the parameters above */
250 AcpiPsUpdateParameterList (Info, REF_DECREMENT);
252 /* Exit now if error above */
254 if (ACPI_FAILURE (Status))
256 return_ACPI_STATUS (Status);
260 * If the method has returned an object, signal this to the caller with
261 * a control exception code
263 if (Info->ReturnObject)
265 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Method returned ObjDesc=%p\n",
266 Info->ReturnObject));
267 ACPI_DUMP_STACK_ENTRY (Info->ReturnObject);
269 Status = AE_CTRL_RETURN_VALUE;
272 return_ACPI_STATUS (Status);
276 /*******************************************************************************
278 * FUNCTION: AcpiPsUpdateParameterList
280 * PARAMETERS: Info - See ACPI_EVALUATE_INFO
281 * (Used: ParameterType and Parameters)
282 * Action - Add or Remove reference
286 * DESCRIPTION: Update reference count on all method parameter objects
288 ******************************************************************************/
291 AcpiPsUpdateParameterList (
292 ACPI_EVALUATE_INFO *Info,
298 if (Info->Parameters)
300 /* Update reference count for each parameter */
302 for (i = 0; Info->Parameters[i]; i++)
304 /* Ignore errors, just do them all */
306 (void) AcpiUtUpdateObjectReference (
307 Info->Parameters[i], Action);