DynamicTablesPkg: AML code generation for a _LPI object
_LPI object provides a method to describe Low Power Idle states that define the local power states for each node in a hierarchical processor topology. Therefore, add AmlCreateLpiNode() to generate code for a _LPI object. AmlCreateLpiNode ("_LPI", 0, 1, ParentNode, &LpiNode) is equivalent of the following ASL code: Name (_LPI, Package ( 0, // Revision 1, // LevelId 0 // Count )) Reviewed-by: Sami Mujawar <sami.mujawar@arm.com> Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
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@ -672,6 +672,50 @@ AmlCodeGenMethodRetNameString (
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OUT AML_OBJECT_NODE_HANDLE * NewObjectNode OPTIONAL
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);
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/** Create a _LPI name.
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AmlCreateLpiNode ("_LPI", 0, 1, ParentNode, &LpiNode) is
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equivalent of the following ASL code:
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Name (_LPI, Package (
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0, // Revision
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1, // LevelId
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0 // Count
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))
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This function doesn't define any LPI state. As shown above, the count
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of _LPI state is set to 0.
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The AmlAddLpiState () function must be used to add LPI states.
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Cf ACPI 6.3 specification, s8.4.4 "Lower Power Idle States".
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@ingroup CodeGenApis
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@param [in] LpiNameString The new LPI 's object name.
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Must be a NULL-terminated ASL NameString
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e.g.: "_LPI", "DEV0.PLPI", etc.
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The input string is copied.
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@param [in] Revision Revision number of the _LPI states.
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@param [in] LevelId A platform defined number that identifies the
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level of hierarchy of the processor node to
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which the LPI states apply.
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@param [in] ParentNode If provided, set ParentNode as the parent
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of the node created.
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@param [out] NewLpiNode If success, contains the created node.
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@retval EFI_SUCCESS The function completed successfully.
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@retval EFI_INVALID_PARAMETER Invalid parameter.
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@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
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**/
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EFI_STATUS
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EFIAPI
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AmlCreateLpiNode (
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IN CONST CHAR8 * LpiNameString,
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IN UINT16 Revision,
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IN UINT64 LevelId,
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IN AML_NODE_HANDLE ParentNode, OPTIONAL
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OUT AML_OBJECT_NODE_HANDLE * NewLpiNode OPTIONAL
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);
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// DEPRECATED APIS
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#ifndef DISABLE_NEW_DEPRECATED_INTERFACES
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