diff options
author | Jung-uk Kim <jkim@FreeBSD.org> | 2014-02-17 17:10:41 +0000 |
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committer | Jung-uk Kim <jkim@FreeBSD.org> | 2014-02-17 17:10:41 +0000 |
commit | 526d99544ba42a5a2155021975b3b97da425819e (patch) | |
tree | f33eb960cbd87cb5fa516e45153eb6351dc8ea2e /source/components/dispatcher/dsmethod.c | |
parent | 7bf0bd8c239ae7e6cb5c98382db85377146519d6 (diff) |
Notes
Diffstat (limited to 'source/components/dispatcher/dsmethod.c')
-rw-r--r-- | source/components/dispatcher/dsmethod.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/source/components/dispatcher/dsmethod.c b/source/components/dispatcher/dsmethod.c index 3fb2135fa887..5cefb4fbb627 100644 --- a/source/components/dispatcher/dsmethod.c +++ b/source/components/dispatcher/dsmethod.c @@ -49,6 +49,8 @@ #include "acinterp.h" #include "acnamesp.h" #include "acdisasm.h" +#include "acparser.h" +#include "amlcode.h" #define _COMPONENT ACPI_DISPATCHER @@ -57,12 +59,149 @@ /* Local prototypes */ static ACPI_STATUS +AcpiDsDetectNamedOpcodes ( + ACPI_WALK_STATE *WalkState, + ACPI_PARSE_OBJECT **OutOp); + +static ACPI_STATUS AcpiDsCreateMethodMutex ( ACPI_OPERAND_OBJECT *MethodDesc); /******************************************************************************* * + * FUNCTION: AcpiDsAutoSerializeMethod + * + * PARAMETERS: Node - Namespace Node of the method + * ObjDesc - Method object attached to node + * + * RETURN: Status + * + * DESCRIPTION: Parse a control method AML to scan for control methods that + * need serialization due to the creation of named objects. + * + * NOTE: It is a bit of overkill to mark all such methods serialized, since + * there is only a problem if the method actually blocks during execution. + * A blocking operation is, for example, a Sleep() operation, or any access + * to an operation region. However, it is probably not possible to easily + * detect whether a method will block or not, so we simply mark all suspicious + * methods as serialized. + * + * NOTE2: This code is essentially a generic routine for parsing a single + * control method. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiDsAutoSerializeMethod ( + ACPI_NAMESPACE_NODE *Node, + ACPI_OPERAND_OBJECT *ObjDesc) +{ + ACPI_STATUS Status; + ACPI_PARSE_OBJECT *Op = NULL; + ACPI_WALK_STATE *WalkState; + + + ACPI_FUNCTION_TRACE_PTR (DsAutoSerializeMethod, Node); + + + ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, + "Method auto-serialization parse [%4.4s] %p\n", + AcpiUtGetNodeName (Node), Node)); + + /* Create/Init a root op for the method parse tree */ + + Op = AcpiPsAllocOp (AML_METHOD_OP); + if (!Op) + { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + AcpiPsSetName (Op, Node->Name.Integer); + Op->Common.Node = Node; + + /* Create and initialize a new walk state */ + + WalkState = AcpiDsCreateWalkState (Node->OwnerId, NULL, NULL, NULL); + if (!WalkState) + { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + Status = AcpiDsInitAmlWalk (WalkState, Op, Node, ObjDesc->Method.AmlStart, + ObjDesc->Method.AmlLength, NULL, 0); + if (ACPI_FAILURE (Status)) + { + AcpiDsDeleteWalkState (WalkState); + return_ACPI_STATUS (Status); + } + + WalkState->DescendingCallback = AcpiDsDetectNamedOpcodes; + + /* Parse the method, scan for creation of named objects */ + + Status = AcpiPsParseAml (WalkState); + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + + AcpiPsDeleteParseTree (Op); + return_ACPI_STATUS (Status); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsDetectNamedOpcodes + * + * PARAMETERS: WalkState - Current state of the parse tree walk + * OutOp - Unused, required for parser interface + * + * RETURN: Status + * + * DESCRIPTION: Descending callback used during the loading of ACPI tables. + * Currently used to detect methods that must be marked serialized + * in order to avoid problems with the creation of named objects. + * + ******************************************************************************/ + +static ACPI_STATUS +AcpiDsDetectNamedOpcodes ( + ACPI_WALK_STATE *WalkState, + ACPI_PARSE_OBJECT **OutOp) +{ + + ACPI_FUNCTION_NAME (AcpiDsDetectNamedOpcodes); + + + /* We are only interested in opcodes that create a new name */ + + if (!(WalkState->OpInfo->Flags & (AML_NAMED | AML_CREATE | AML_FIELD))) + { + return (AE_OK); + } + + /* + * At this point, we know we have a Named object opcode. + * Mark the method as serialized. Later code will create a mutex for + * this method to enforce serialization. + */ + WalkState->MethodDesc->Method.InfoFlags |= ACPI_METHOD_SERIALIZED; + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Method serialized [%4.4s] %p - [%s] (%4.4X)\n", + WalkState->MethodNode->Name.Ascii, WalkState->MethodNode, + WalkState->OpInfo->Name, WalkState->Opcode)); + + /* Abort the parse, no need to examine this method any further */ + + return (AE_CTRL_TERMINATE); +} + + +/******************************************************************************* + * * FUNCTION: AcpiDsMethodError * * PARAMETERS: Status - Execution status |