/****************************************************************************** * * Module Name: nsinit - namespace initialization * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2021, Intel Corp. * All rights reserved. * * 2. License * * 2.1. This is your license from Intel Corp. under its intellectual property * rights. You may have additional license terms from the party that provided * you this software, covering your right to use that party's intellectual * property rights. * * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a * copy of the source code appearing in this file ("Covered Code") an * irrevocable, perpetual, worldwide license under Intel's copyrights in the * base code distributed originally by Intel ("Original Intel Code") to copy, * make derivatives, distribute, use and display any portion of the Covered * Code in any form, with the right to sublicense such rights; and * * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent * license (with the right to sublicense), under only those claims of Intel * patents that are infringed by the Original Intel Code, to make, use, sell, * offer to sell, and import the Covered Code and derivative works thereof * solely to the minimum extent necessary to exercise the above copyright * license, and in no event shall the patent license extend to any additions * to or modifications of the Original Intel Code. No other license or right * is granted directly or by implication, estoppel or otherwise; * * The above copyright and patent license is granted only if the following * conditions are met: * * 3. Conditions * * 3.1. Redistribution of Source with Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification with rights to further distribute source must include * the above Copyright Notice, the above License, this list of Conditions, * and the following Disclaimer and Export Compliance provision. In addition, * Licensee must cause all Covered Code to which Licensee contributes to * contain a file documenting the changes Licensee made to create that Covered * Code and the date of any change. Licensee must include in that file the * documentation of any changes made by any predecessor Licensee. Licensee * must include a prominent statement that the modification is derived, * directly or indirectly, from Original Intel Code. * * 3.2. Redistribution of Source with no Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification without rights to further distribute source must * include the following Disclaimer and Export Compliance provision in the * documentation and/or other materials provided with distribution. In * addition, Licensee may not authorize further sublicense of source of any * portion of the Covered Code, and must include terms to the effect that the * license from Licensee to its licensee is limited to the intellectual * property embodied in the software Licensee provides to its licensee, and * not to intellectual property embodied in modifications its licensee may * make. * * 3.3. Redistribution of Executable. Redistribution in executable form of any * substantial portion of the Covered Code or modification must reproduce the * above Copyright Notice, and the following Disclaimer and Export Compliance * provision in the documentation and/or other materials provided with the * distribution. * * 3.4. Intel retains all right, title, and interest in and to the Original * Intel Code. * * 3.5. Neither the name Intel nor any other trademark owned or controlled by * Intel shall be used in advertising or otherwise to promote the sale, use or * other dealings in products derived from or relating to the Covered Code * without prior written authorization from Intel. * * 4. Disclaimer and Export Compliance * * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A * PARTICULAR PURPOSE. * * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY * LIMITED REMEDY. * * 4.3. Licensee shall not export, either directly or indirectly, any of this * software or system incorporating such software without first obtaining any * required license or other approval from the U. S. Department of Commerce or * any other agency or department of the United States Government. In the * event Licensee exports any such software from the United States or * re-exports any such software from a foreign destination, Licensee shall * ensure that the distribution and export/re-export of the software is in * compliance with all laws, regulations, orders, or other restrictions of the * U.S. Export Administration Regulations. Licensee agrees that neither it nor * any of its subsidiaries will export/re-export any technical data, process, * software, or service, directly or indirectly, to any country for which the * United States government or any agency thereof requires an export license, * other governmental approval, or letter of assurance, without first obtaining * such license, approval or letter. * ***************************************************************************** * * Alternatively, you may choose to be licensed under the terms of the * following license: * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Alternatively, you may choose to be licensed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * *****************************************************************************/ #include #include #include #include #include #include #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME ("nsinit") /* Local prototypes */ static ACPI_STATUS AcpiNsInitOneObject ( ACPI_HANDLE ObjHandle, UINT32 Level, void *Context, void **ReturnValue); static ACPI_STATUS AcpiNsInitOneDevice ( ACPI_HANDLE ObjHandle, UINT32 NestingLevel, void *Context, void **ReturnValue); static ACPI_STATUS AcpiNsFindIniMethods ( ACPI_HANDLE ObjHandle, UINT32 NestingLevel, void *Context, void **ReturnValue); /******************************************************************************* * * FUNCTION: AcpiNsInitializeObjects * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Walk the entire namespace and perform any necessary * initialization on the objects found therein * ******************************************************************************/ ACPI_STATUS AcpiNsInitializeObjects ( void) { ACPI_STATUS Status; ACPI_INIT_WALK_INFO Info; ACPI_FUNCTION_TRACE (NsInitializeObjects); ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Completing Initialization of ACPI Objects\n")); ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "**** Starting initialization of namespace objects ****\n")); ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT, "Final data object initialization: ")); /* Clear the info block */ memset (&Info, 0, sizeof (ACPI_INIT_WALK_INFO)); /* Walk entire namespace from the supplied root */ /* * TBD: will become ACPI_TYPE_PACKAGE as this type object * is now the only one that supports deferred initialization * (forward references). */ Status = AcpiWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, AcpiNsInitOneObject, NULL, &Info, NULL); if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "During WalkNamespace")); } ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT, "Namespace contains %u (0x%X) objects\n", Info.ObjectCount, Info.ObjectCount)); ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "%u Control Methods found\n%u Op Regions found\n", Info.MethodCount, Info.OpRegionCount)); return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiNsInitializeDevices * * PARAMETERS: None * * RETURN: ACPI_STATUS * * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices. * This means running _INI on all present devices. * * Note: We install PCI config space handler on region access, * not here. * ******************************************************************************/ ACPI_STATUS AcpiNsInitializeDevices ( UINT32 Flags) { ACPI_STATUS Status = AE_OK; ACPI_DEVICE_WALK_INFO Info; ACPI_HANDLE Handle; ACPI_FUNCTION_TRACE (NsInitializeDevices); if (!(Flags & ACPI_NO_DEVICE_INIT)) { ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI Devices\n")); /* Init counters */ Info.DeviceCount = 0; Info.Num_STA = 0; Info.Num_INI = 0; ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT, "Initializing Device/Processor/Thermal objects " "and executing _INI/_STA methods:\n")); /* Tree analysis: find all subtrees that contain _INI methods */ Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, FALSE, AcpiNsFindIniMethods, NULL, &Info, NULL); if (ACPI_FAILURE (Status)) { goto ErrorExit; } /* Allocate the evaluation information block */ Info.EvaluateInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); if (!Info.EvaluateInfo) { Status = AE_NO_MEMORY; goto ErrorExit; } /* * Execute the "global" _INI method that may appear at the root. * This support is provided for Windows compatibility (Vista+) and * is not part of the ACPI specification. */ Info.EvaluateInfo->PrefixNode = AcpiGbl_RootNode; Info.EvaluateInfo->RelativePathname = METHOD_NAME__INI; Info.EvaluateInfo->Parameters = NULL; Info.EvaluateInfo->Flags = ACPI_IGNORE_RETURN_VALUE; Status = AcpiNsEvaluate (Info.EvaluateInfo); if (ACPI_SUCCESS (Status)) { Info.Num_INI++; } /* * Execute \_SB._INI. * There appears to be a strict order requirement for \_SB._INI, * which should be evaluated before any _REG evaluations. */ Status = AcpiGetHandle (NULL, "\\_SB", &Handle); if (ACPI_SUCCESS (Status)) { memset (Info.EvaluateInfo, 0, sizeof (ACPI_EVALUATE_INFO)); Info.EvaluateInfo->PrefixNode = Handle; Info.EvaluateInfo->RelativePathname = METHOD_NAME__INI; Info.EvaluateInfo->Parameters = NULL; Info.EvaluateInfo->Flags = ACPI_IGNORE_RETURN_VALUE; Status = AcpiNsEvaluate (Info.EvaluateInfo); if (ACPI_SUCCESS (Status)) { Info.Num_INI++; } } } /* * Run all _REG methods * * Note: Any objects accessed by the _REG methods will be automatically * initialized, even if they contain executable AML (see the call to * AcpiNsInitializeObjects below). * * Note: According to the ACPI specification, we actually needn't execute * _REG for SystemMemory/SystemIo operation regions, but for PCI_Config * operation regions, it is required to evaluate _REG for those on a PCI * root bus that doesn't contain _BBN object. So this code is kept here * in order not to break things. */ if (!(Flags & ACPI_NO_ADDRESS_SPACE_INIT)) { ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Executing _REG OpRegion methods\n")); Status = AcpiEvInitializeOpRegions (); if (ACPI_FAILURE (Status)) { goto ErrorExit; } } if (!(Flags & ACPI_NO_DEVICE_INIT)) { /* Walk namespace to execute all _INIs on present devices */ Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, FALSE, AcpiNsInitOneDevice, NULL, &Info, NULL); /* * Any _OSI requests should be completed by now. If the BIOS has * requested any Windows OSI strings, we will always truncate * I/O addresses to 16 bits -- for Windows compatibility. */ if (AcpiGbl_OsiData >= ACPI_OSI_WIN_2000) { AcpiGbl_TruncateIoAddresses = TRUE; } ACPI_FREE (Info.EvaluateInfo); if (ACPI_FAILURE (Status)) { goto ErrorExit; } ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT, " Executed %u _INI methods requiring %u _STA executions " "(examined %u objects)\n", Info.Num_INI, Info.Num_STA, Info.DeviceCount)); } return_ACPI_STATUS (Status); ErrorExit: ACPI_EXCEPTION ((AE_INFO, Status, "During device initialization")); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiNsInitOnePackage * * PARAMETERS: ObjHandle - Node * Level - Current nesting level * Context - Not used * ReturnValue - Not used * * RETURN: Status * * DESCRIPTION: Callback from AcpiWalkNamespace. Invoked for every package * within the namespace. Used during dynamic load of an SSDT. * ******************************************************************************/ ACPI_STATUS AcpiNsInitOnePackage ( ACPI_HANDLE ObjHandle, UINT32 Level, void *Context, void **ReturnValue) { ACPI_STATUS Status; ACPI_OPERAND_OBJECT *ObjDesc; ACPI_NAMESPACE_NODE *Node = (ACPI_NAMESPACE_NODE *) ObjHandle; ObjDesc = AcpiNsGetAttachedObject (Node); if (!ObjDesc) { return (AE_OK); } /* Exit if package is already initialized */ if (ObjDesc->Package.Flags & AOPOBJ_DATA_VALID) { return (AE_OK); } Status = AcpiDsGetPackageArguments (ObjDesc); if (ACPI_FAILURE (Status)) { return (AE_OK); } Status = AcpiUtWalkPackageTree (ObjDesc, NULL, AcpiDsInitPackageElement, NULL); if (ACPI_FAILURE (Status)) { return (AE_OK); } ObjDesc->Package.Flags |= AOPOBJ_DATA_VALID; return (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiNsInitOneObject * * PARAMETERS: ObjHandle - Node * Level - Current nesting level * Context - Points to a init info struct * ReturnValue - Not used * * RETURN: Status * * DESCRIPTION: Callback from AcpiWalkNamespace. Invoked for every object * within the namespace. * * Currently, the only objects that require initialization are: * 1) Methods * 2) Op Regions * ******************************************************************************/ static ACPI_STATUS AcpiNsInitOneObject ( ACPI_HANDLE ObjHandle, UINT32 Level, void *Context, void **ReturnValue) { ACPI_OBJECT_TYPE Type; ACPI_STATUS Status = AE_OK; ACPI_INIT_WALK_INFO *Info = (ACPI_INIT_WALK_INFO *) Context; ACPI_NAMESPACE_NODE *Node = (ACPI_NAMESPACE_NODE *) ObjHandle; ACPI_OPERAND_OBJECT *ObjDesc; ACPI_FUNCTION_NAME (NsInitOneObject); Info->ObjectCount++; /* And even then, we are only interested in a few object types */ Type = AcpiNsGetType (ObjHandle); ObjDesc = AcpiNsGetAttachedObject (Node); if (!ObjDesc) { return (AE_OK); } /* Increment counters for object types we are looking for */ switch (Type) { case ACPI_TYPE_REGION: Info->OpRegionCount++; break; case ACPI_TYPE_BUFFER_FIELD: Info->FieldCount++; break; case ACPI_TYPE_LOCAL_BANK_FIELD: Info->FieldCount++; break; case ACPI_TYPE_BUFFER: Info->BufferCount++; break; case ACPI_TYPE_PACKAGE: Info->PackageCount++; break; default: /* No init required, just exit now */ return (AE_OK); } /* If the object is already initialized, nothing else to do */ if (ObjDesc->Common.Flags & AOPOBJ_DATA_VALID) { return (AE_OK); } /* Must lock the interpreter before executing AML code */ AcpiExEnterInterpreter (); /* * Only initialization of Package objects can be deferred, in order * to support forward references. */ switch (Type) { case ACPI_TYPE_LOCAL_BANK_FIELD: /* TBD: BankFields do not require deferred init, remove this code */ Info->FieldInit++; Status = AcpiDsGetBankFieldArguments (ObjDesc); break; case ACPI_TYPE_PACKAGE: /* Complete the initialization/resolution of the package object */ Info->PackageInit++; Status = AcpiNsInitOnePackage (ObjHandle, Level, NULL, NULL); break; default: /* No other types should get here */ Status = AE_TYPE; ACPI_EXCEPTION ((AE_INFO, Status, "Opcode is not deferred [%4.4s] (%s)", AcpiUtGetNodeName (Node), AcpiUtGetTypeName (Type))); break; } if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "Could not execute arguments for [%4.4s] (%s)", AcpiUtGetNodeName (Node), AcpiUtGetTypeName (Type))); } /* * We ignore errors from above, and always return OK, since we don't want * to abort the walk on any single error. */ AcpiExExitInterpreter (); return (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiNsFindIniMethods * * PARAMETERS: ACPI_WALK_CALLBACK * * RETURN: ACPI_STATUS * * DESCRIPTION: Called during namespace walk. Finds objects named _INI under * device/processor/thermal objects, and marks the entire subtree * with a SUBTREE_HAS_INI flag. This flag is used during the * subsequent device initialization walk to avoid entire subtrees * that do not contain an _INI. * ******************************************************************************/ static ACPI_STATUS AcpiNsFindIniMethods ( ACPI_HANDLE ObjHandle, UINT32 NestingLevel, void *Context, void **ReturnValue) { ACPI_DEVICE_WALK_INFO *Info = ACPI_CAST_PTR (ACPI_DEVICE_WALK_INFO, Context); ACPI_NAMESPACE_NODE *Node; ACPI_NAMESPACE_NODE *ParentNode; /* Keep count of device/processor/thermal objects */ Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle); if ((Node->Type == ACPI_TYPE_DEVICE) || (Node->Type == ACPI_TYPE_PROCESSOR) || (Node->Type == ACPI_TYPE_THERMAL)) { Info->DeviceCount++; return (AE_OK); } /* We are only looking for methods named _INI */ if (!ACPI_COMPARE_NAMESEG (Node->Name.Ascii, METHOD_NAME__INI)) { return (AE_OK); } /* * The only _INI methods that we care about are those that are * present under Device, Processor, and Thermal objects. */ ParentNode = Node->Parent; switch (ParentNode->Type) { case ACPI_TYPE_DEVICE: case ACPI_TYPE_PROCESSOR: case ACPI_TYPE_THERMAL: /* Mark parent and bubble up the INI present flag to the root */ while (ParentNode) { ParentNode->Flags |= ANOBJ_SUBTREE_HAS_INI; ParentNode = ParentNode->Parent; } break; default: break; } return (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiNsInitOneDevice * * PARAMETERS: ACPI_WALK_CALLBACK * * RETURN: ACPI_STATUS * * DESCRIPTION: This is called once per device soon after ACPI is enabled * to initialize each device. It determines if the device is * present, and if so, calls _INI. * ******************************************************************************/ static ACPI_STATUS AcpiNsInitOneDevice ( ACPI_HANDLE ObjHandle, UINT32 NestingLevel, void *Context, void **ReturnValue) { ACPI_DEVICE_WALK_INFO *WalkInfo = ACPI_CAST_PTR (ACPI_DEVICE_WALK_INFO, Context); ACPI_EVALUATE_INFO *Info = WalkInfo->EvaluateInfo; UINT32 Flags; ACPI_STATUS Status; ACPI_NAMESPACE_NODE *DeviceNode; ACPI_FUNCTION_TRACE (NsInitOneDevice); /* We are interested in Devices, Processors and ThermalZones only */ DeviceNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle); if ((DeviceNode->Type != ACPI_TYPE_DEVICE) && (DeviceNode->Type != ACPI_TYPE_PROCESSOR) && (DeviceNode->Type != ACPI_TYPE_THERMAL)) { return_ACPI_STATUS (AE_OK); } /* * Because of an earlier namespace analysis, all subtrees that contain an * _INI method are tagged. * * If this device subtree does not contain any _INI methods, we * can exit now and stop traversing this entire subtree. */ if (!(DeviceNode->Flags & ANOBJ_SUBTREE_HAS_INI)) { return_ACPI_STATUS (AE_CTRL_DEPTH); } /* * Run _STA to determine if this device is present and functioning. We * must know this information for two important reasons (from ACPI spec): * * 1) We can only run _INI if the device is present. * 2) We must abort the device tree walk on this subtree if the device is * not present and is not functional (we will not examine the children) * * The _STA method is not required to be present under the device, we * assume the device is present if _STA does not exist. */ ACPI_DEBUG_EXEC (AcpiUtDisplayInitPathname ( ACPI_TYPE_METHOD, DeviceNode, METHOD_NAME__STA)); Status = AcpiUtExecute_STA (DeviceNode, &Flags); if (ACPI_FAILURE (Status)) { /* Ignore error and move on to next device */ return_ACPI_STATUS (AE_OK); } /* * Flags == -1 means that _STA was not found. In this case, we assume that * the device is both present and functional. * * From the ACPI spec, description of _STA: * * "If a device object (including the processor object) does not have an * _STA object, then OSPM assumes that all of the above bits are set (in * other words, the device is present, ..., and functioning)" */ if (Flags != ACPI_UINT32_MAX) { WalkInfo->Num_STA++; } /* * Examine the PRESENT and FUNCTIONING status bits * * Note: ACPI spec does not seem to specify behavior for the present but * not functioning case, so we assume functioning if present. */ if (!(Flags & ACPI_STA_DEVICE_PRESENT)) { /* Device is not present, we must examine the Functioning bit */ if (Flags & ACPI_STA_DEVICE_FUNCTIONING) { /* * Device is not present but is "functioning". In this case, * we will not run _INI, but we continue to examine the children * of this device. * * From the ACPI spec, description of _STA: (Note - no mention * of whether to run _INI or not on the device in question) * * "_STA may return bit 0 clear (not present) with bit 3 set * (device is functional). This case is used to indicate a valid * device for which no device driver should be loaded (for example, * a bridge device.) Children of this device may be present and * valid. OSPM should continue enumeration below a device whose * _STA returns this bit combination" */ return_ACPI_STATUS (AE_OK); } else { /* * Device is not present and is not functioning. We must abort the * walk of this subtree immediately -- don't look at the children * of such a device. * * From the ACPI spec, description of _INI: * * "If the _STA method indicates that the device is not present, * OSPM will not run the _INI and will not examine the children * of the device for _INI methods" */ return_ACPI_STATUS (AE_CTRL_DEPTH); } } /* * The device is present or is assumed present if no _STA exists. * Run the _INI if it exists (not required to exist) * * Note: We know there is an _INI within this subtree, but it may not be * under this particular device, it may be lower in the branch. */ if (!ACPI_COMPARE_NAMESEG (DeviceNode->Name.Ascii, "_SB_") || DeviceNode->Parent != AcpiGbl_RootNode) { ACPI_DEBUG_EXEC (AcpiUtDisplayInitPathname ( ACPI_TYPE_METHOD, DeviceNode, METHOD_NAME__INI)); memset (Info, 0, sizeof (ACPI_EVALUATE_INFO)); Info->PrefixNode = DeviceNode; Info->RelativePathname = METHOD_NAME__INI; Info->Parameters = NULL; Info->Flags = ACPI_IGNORE_RETURN_VALUE; Status = AcpiNsEvaluate (Info); if (ACPI_SUCCESS (Status)) { WalkInfo->Num_INI++; } #ifdef ACPI_DEBUG_OUTPUT else if (Status != AE_NOT_FOUND) { /* Ignore error and move on to next device */ char *ScopeName = AcpiNsGetNormalizedPathname (DeviceNode, TRUE); ACPI_EXCEPTION ((AE_INFO, Status, "during %s._INI execution", ScopeName)); ACPI_FREE (ScopeName); } #endif } /* Ignore errors from above */ Status = AE_OK; /* * The _INI method has been run if present; call the Global Initialization * Handler for this device. */ if (AcpiGbl_InitHandler) { Status = AcpiGbl_InitHandler (DeviceNode, ACPI_INIT_DEVICE_INI); } return_ACPI_STATUS (Status); }