/**
Return the child objects buffer from AML Handle's object child list.
@param[in] AmlParentHandle Parent handle.
@param[in] AmlHandle The current child handle.
@param[out] Buffer On return, points to the next returned child buffer or NULL if there are no
child buffer.
@retval EFI_SUCCESS Success
@retval EFI_INVALID_PARAMETER AmlParentHandle does not refer to a valid ACPI object.
**/
EFI_STATUS
AmlGetChildFromObjectChildList (
IN EFI_AML_HANDLE *AmlParentHandle,
IN EFI_AML_HANDLE *AmlHandle,
OUT VOID **Buffer
)
{
EFI_STATUS Status;
UINT8 *CurrentBuffer;
if ((AmlParentHandle->AmlByteEncoding->Attribute & AML_HAS_CHILD_OBJ) == 0) {
//
// No ObjectList
//
*Buffer = NULL;
return EFI_SUCCESS;
}
//
// Do we need add node within METHOD?
// Yes, just add Object is OK. But we need filter NameString for METHOD invoke.
//
//
// Now, we get the last node.
//
Status = AmlGetOffsetAfterLastOption (AmlParentHandle, &CurrentBuffer);
if (EFI_ERROR (Status)) {
return EFI_INVALID_PARAMETER;
}
//
// Go through all the reset buffer.
//
if ((UINTN)AmlHandle->Buffer < (UINTN)CurrentBuffer) {
//
// Buffer < Data means next node is first object
//
} else if ((UINTN)AmlHandle->Buffer + AmlHandle->Size < (UINTN)AmlParentHandle->Buffer + AmlParentHandle->Size) {
//
// There is still more node
//
CurrentBuffer = AmlHandle->Buffer + AmlHandle->Size;
} else {
//
// No more data
//
*Buffer = NULL;
return EFI_SUCCESS;
}
return AmlGetChildFromObjectBuffer (AmlParentHandle, CurrentBuffer, Buffer);
}
/**
Construct child node list according to the AML handle.
@param[in] AmlHandle AML handle.
@param[in] AmlRootNodeList AML root node list.
@param[in] AmlParentNodeList AML parent node list.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER AML handle does not refer to a valid ACPI object.
**/
EFI_STATUS
AmlConstructNodeListForChild (
IN EFI_AML_HANDLE *AmlHandle,
IN EFI_AML_NODE_LIST *AmlRootNodeList,
IN EFI_AML_NODE_LIST *AmlParentNodeList
)
{
AML_BYTE_ENCODING *AmlByteEncoding;
UINT8 *Buffer;
UINTN BufferSize;
UINT8 *CurrentBuffer;
EFI_AML_HANDLE *AmlChildHandle;
EFI_STATUS Status;
CurrentBuffer = NULL;
AmlChildHandle = NULL;
AmlByteEncoding = AmlHandle->AmlByteEncoding;
Buffer = AmlHandle->Buffer;
BufferSize = AmlHandle->Size;
//
// Check if we need recursively add node
//
if ((AmlByteEncoding->Attribute & AML_HAS_CHILD_OBJ) == 0) {
//
// No more node need to be added
//
return EFI_SUCCESS;
}
//
// Do we need add node within METHOD?
// Yes, just add Object is OK. But we need filter NameString for METHOD invoke.
//
//
// Now, we get the last node.
//
Status = AmlGetOffsetAfterLastOption (AmlHandle, &CurrentBuffer);
if (EFI_ERROR (Status)) {
return EFI_INVALID_PARAMETER;
}
//
// Go through all the reset buffer.
//
while ((UINTN)CurrentBuffer < (UINTN)Buffer + BufferSize) {
//
// Find the child node.
//
Status = SdtOpenEx (CurrentBuffer, (UINTN)Buffer + BufferSize - (UINTN)CurrentBuffer, (EFI_ACPI_HANDLE *)&AmlChildHandle);
if (EFI_ERROR (Status)) {
//
// No child found, break now.
//
break;
}
//
// Good, find the child. Construct node recursively
//
Status = AmlConstructNodeList (
AmlChildHandle,
AmlRootNodeList,
AmlParentNodeList
);
if (EFI_ERROR (Status)) {
break;
}
//
// Parse next one
//
CurrentBuffer += AmlChildHandle->Size;
Close ((EFI_ACPI_HANDLE)AmlChildHandle);
}
return EFI_SUCCESS;
}
