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DynamicTablesPkg: Add AmlRdSetEndTagChecksum() 

Add AmlRdSetEndTagChecksum(), setting the CheckSum value contained in a
Resource Data element.

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>
This commit is contained in:
Pierre Gondois 2021-10-08 15:46:15 +01:00 committed by mergify[bot]
parent bfaf7c8b9e
commit 28b2df475f
2 changed files with 54 additions and 0 deletions
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33
DynamicTablesPkg/Library/Common/AmlLib/ResourceData/AmlResourceData.c
View File

@ -101,3 +101,36 @@ AmlRdGetSize (
return ((ACPI_SMALL_RESOURCE_HEADER*)Header)->Bits.Length +
sizeof (ACPI_SMALL_RESOURCE_HEADER);
}
/** Set the Checksum of an EndTag resource data.
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."
@param [in] Header Pointer to the first byte of a resource data.
@param [in] CheckSum Checksum value to set.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
AmlRdSetEndTagChecksum (
IN CONST AML_RD_HEADER * Header,
IN UINT8 CheckSum
)
{
if ((Header == NULL) ||
!AmlRdCompareDescId (
Header,
AML_RD_BUILD_SMALL_DESC_ID (ACPI_SMALL_END_TAG_DESCRIPTOR_NAME))) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
((EFI_ACPI_END_TAG_DESCRIPTOR*)Header)->Checksum = CheckSum;
return EFI_SUCCESS;
}

21
DynamicTablesPkg/Library/Common/AmlLib/ResourceData/AmlResourceData.h
View File

@ -171,4 +171,25 @@ AmlRdGetSize (
IN CONST AML_RD_HEADER * Header
);
/** Set the Checksum of an EndTag resource data.
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."
@param [in] Header Pointer to the first byte of a resource data.
@param [in] CheckSum Checksum value to set.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
AmlRdSetEndTagChecksum (
IN CONST AML_RD_HEADER * Header,
IN UINT8 CheckSum
);
#endif // AML_RESOURCE_DATA_H_