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DynamicTablesPkg: AML code generation for a _LPI object

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_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>
This commit is contained in:
Pierre Gondois
2021-10-08 15:46:29 +01:00
committed by mergify[bot]
parent 3e958e93ce
commit 018a962d92
2 changed files with 177 additions and 0 deletions
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44
DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
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@@ -672,6 +672,50 @@ AmlCodeGenMethodRetNameString (
OUT AML_OBJECT_NODE_HANDLE * NewObjectNode OPTIONAL
);
/** Create a _LPI name.
AmlCreateLpiNode ("_LPI", 0, 1, ParentNode, &LpiNode) is
equivalent of the following ASL code:
Name (_LPI, Package (
0, // Revision
1, // LevelId
0 // Count
))
This function doesn't define any LPI state. As shown above, the count
of _LPI state is set to 0.
The AmlAddLpiState () function must be used to add LPI states.
Cf ACPI 6.3 specification, s8.4.4 "Lower Power Idle States".
@ingroup CodeGenApis
@param [in] LpiNameString The new LPI 's object name.
Must be a NULL-terminated ASL NameString
e.g.: "_LPI", "DEV0.PLPI", etc.
The input string is copied.
@param [in] Revision Revision number of the _LPI states.
@param [in] LevelId A platform defined number that identifies the
level of hierarchy of the processor node to
which the LPI states apply.
@param [in] ParentNode If provided, set ParentNode as the parent
of the node created.
@param [out] NewLpiNode If success, contains the created node.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
EFI_STATUS
EFIAPI
AmlCreateLpiNode (
IN CONST CHAR8 * LpiNameString,
IN UINT16 Revision,
IN UINT64 LevelId,
IN AML_NODE_HANDLE ParentNode, OPTIONAL
OUT AML_OBJECT_NODE_HANDLE * NewLpiNode OPTIONAL
);
// DEPRECATED APIS
#ifndef DISABLE_NEW_DEPRECATED_INTERFACES