DynamicTablesPkg: Add AmlSetRdListCheckSum()
Lists of Resource Data elements end with an EndTag (most of the time). This function finds the EndTag (if present) in a list of Resource Data elements and sets the checksum. ACPI 6.4, s6.4.2.9 "End Tag": "This checksum is generated such that adding it to the sum of all the data bytes will produce a zero sum." "If the checksum field is zero, the resource data is treated as if the checksum operation succeeded. Configuration proceeds normally." Reviewed-by: Sami Mujawar <sami.mujawar@arm.com> Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
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@@ -91,5 +91,37 @@ AmlPropagateInformation (
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IN UINT8 NodeCount
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);
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/** Find and set the EndTag's Checksum of a list of Resource Data elements.
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Lists of Resource Data elements end with an EndTag (most of the time). This
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function finds the EndTag (if present) in a list of Resource Data elements
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and sets the checksum.
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ACPI 6.4, s6.4.2.9 "End Tag":
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"This checksum is generated such that adding it to the sum of all the data
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bytes will produce a zero sum."
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"If the checksum field is zero, the resource data is treated as if the
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checksum operation succeeded. Configuration proceeds normally."
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To avoid re-computing checksums, if a new resource data elements is
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added/removed/modified in a list of resource data elements, the AmlLib
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resets the checksum to 0.
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@param [in] BufferOpNode Node having a list of Resource Data elements.
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@param [in] CheckSum CheckSum to store in the EndTag.
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To ignore/avoid computing the checksum,
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give 0.
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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_NOT_FOUND No EndTag found.
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**/
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EFI_STATUS
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EFIAPI
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AmlSetRdListCheckSum (
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IN AML_OBJECT_NODE * BufferOpNode,
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IN UINT8 CheckSum
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);
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#endif // AML_UTILITY_H_
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