[edk2-devel] [PATCH v2 11/21] DynamicTablesPkg: AML Code generation for Resource data EndTag
Sami Mujawar
sami.mujawar at arm.com
Fri Oct 8 14:07:06 UTC 2021
Hi Pierre,
This patch looks good to me.
Reviewed-by: Sami Mujawar <sami.mujawar at arm.com>
Regards,
Sami Mujawar
On 07/10/2021 04:32 PM, Pierre.Gondois at arm.com wrote:
> From: Pierre Gondois <Pierre.Gondois at arm.com>
>
> Add a helper function AmlCodeGenEndTag() to generate AML Resource Data
> EndTag. The EndTag resource data is automatically generated by the ASL
> compiler at the end of a list of resource data elements. Therefore, an
> equivalent function is not present in ASL.
>
> However, AmlCodeGenEndTag() is useful when generating AML code for the
> ResourceTemplate() macro.
>
> Signed-off-by: Pierre Gondois <Pierre.Gondois at arm.com>
> ---
> .../AmlLib/CodeGen/AmlResourceDataCodeGen.c | 113 ++++++++++++++++++
> .../AmlLib/CodeGen/AmlResourceDataCodeGen.h | 43 +++++++
> 2 files changed, 156 insertions(+)
>
> diff --git a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlResourceDataCodeGen.c b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlResourceDataCodeGen.c
> index 20b745f27a2b..0bdb6c24c5bb 100644
> --- a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlResourceDataCodeGen.c
> +++ b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlResourceDataCodeGen.c
> @@ -280,6 +280,119 @@ AmlCodeGenRdRegister (
> return LinkRdNode (RdNode, NameOpNode, NewRdNode);
> }
>
> +/** Code generation for the EndTag resource data.
> +
> + The EndTag resource data is automatically generated by the ASL compiler
> + at the end of a list of resource data elements. Thus, it doesn't have
> + a corresponding ASL function.
> +
> + This function allocates memory to create a data node. It is the caller's
> + responsibility to either:
> + - attach this node to an AML tree;
> + - delete this node.
> +
> + 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."
> +
> + To avoid re-computing checksums, if a new resource data elements is
> + added/removed/modified in a list of resource data elements, the AmlLib
> + resets the checksum to 0.
> +
> + @param [in] CheckSum CheckSum to store in the EndTag.
> + To ignore/avoid computing the checksum,
> + give 0.
> + @param [in] ParentNode If not NULL, add the generated node
> + to the end of the variable list of
> + argument of the ParentNode.
> + The ParentNode must not initially contain
> + an EndTag resource data element.
> + @param [out] NewRdNode If success, contains the generated node.
> +
> + @retval EFI_SUCCESS The function completed successfully.
> + @retval EFI_INVALID_PARAMETER Invalid parameter.
> + @retval EFI_OUT_OF_RESOURCES Could not allocate memory.
> +**/
> +EFI_STATUS
> +EFIAPI
> +AmlCodeGenEndTag (
> + IN UINT8 CheckSum, OPTIONAL
> + IN AML_OBJECT_NODE * ParentNode, OPTIONAL
> + OUT AML_DATA_NODE ** NewRdNode OPTIONAL
> + )
> +{
> + EFI_STATUS Status;
> + AML_DATA_NODE * RdNode;
> + EFI_ACPI_END_TAG_DESCRIPTOR EndTag;
> + ACPI_SMALL_RESOURCE_HEADER SmallResHdr;
> +
> + if ((ParentNode == NULL) && (NewRdNode == NULL)) {
> + ASSERT (0);
> + return EFI_INVALID_PARAMETER;
> + }
> +
> + RdNode = NULL;
> +
> + // Header
> + SmallResHdr.Bits.Length = sizeof (EFI_ACPI_END_TAG_DESCRIPTOR) -
> + sizeof (ACPI_SMALL_RESOURCE_HEADER);
> + SmallResHdr.Bits.Name = ACPI_SMALL_END_TAG_DESCRIPTOR_NAME;
> + SmallResHdr.Bits.Type = ACPI_SMALL_ITEM_FLAG;
> +
> + // Body
> + EndTag.Desc = SmallResHdr.Byte;
> + EndTag.Checksum = CheckSum;
> +
> + Status = AmlCreateDataNode (
> + EAmlNodeDataTypeResourceData,
> + (UINT8*)&EndTag,
> + sizeof (EFI_ACPI_END_TAG_DESCRIPTOR),
> + &RdNode
> + );
> + if (EFI_ERROR (Status)) {
> + ASSERT (0);
> + return Status;
> + }
> +
> + if (NewRdNode != NULL) {
> + *NewRdNode = RdNode;
> + }
> +
> + if (ParentNode != NULL) {
> + // Check the BufferOp doesn't contain any resource data yet.
> + // This is a hard check: do not allow to add an EndTag if the BufferNode
> + // already has resource data elements attached. Indeed, the EndTag should
> + // have already been added.
> + if (AmlGetNextVariableArgument ((AML_NODE_HEADER*)ParentNode, NULL) !=
> + NULL) {
> + ASSERT (0);
> + Status = EFI_INVALID_PARAMETER;
> + goto error_handler;
> + }
> +
> + // Add the EndTag RdNode. Indeed, the AmlAppendRdNode function
> + // is looking for an EndTag, which we are adding here.
> + Status = AmlVarListAddTail (
> + (AML_NODE_HEADER*)ParentNode,
> + (AML_NODE_HEADER*)RdNode
> + );
> + if (EFI_ERROR (Status)) {
> + ASSERT (0);
> + goto error_handler;
> + }
> + }
> +
> + return Status;
> +
> +error_handler:
> + if (RdNode != NULL) {
> + AmlDeleteTree ((AML_NODE_HEADER*)RdNode);
> + }
> + return Status;
> +}
> +
> // DEPRECATED APIS
> #ifndef DISABLE_NEW_DEPRECATED_INTERFACES
>
> diff --git a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlResourceDataCodeGen.h b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlResourceDataCodeGen.h
> index 831d6a7462ae..102340495933 100644
> --- a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlResourceDataCodeGen.h
> +++ b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlResourceDataCodeGen.h
> @@ -104,4 +104,47 @@ AmlCodeGenRdRegister (
> OUT AML_DATA_NODE_HANDLE *NewRdNode OPTIONAL
> );
>
> +/** Code generation for the EndTag resource data.
> +
> + The EndTag resource data is automatically generated by the ASL compiler
> + at the end of a list of resource data elements. Thus, it doesn't have
> + a corresponding ASL function.
> +
> + This function allocates memory to create a data node. It is the caller's
> + responsibility to either:
> + - attach this node to an AML tree;
> + - delete this node.
> +
> + 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."
> +
> + To avoid re-computing checksums, if a new resource data elements is
> + added/removed/modified in a list of resource data elements, the AmlLib
> + resets the checksum to 0.
> +
> + @param [in] CheckSum CheckSum to store in the EndTag.
> + To ignore/avoid computing the checksum,
> + give 0.
> + @param [in] ParentNode If not NULL, add the generated node
> + to the end of the variable list of
> + argument of the ParentNode.
> + The ParentNode must not initially contain
> + an EndTag resource data element.
> + @param [out] NewRdNode If success, contains the generated node.
> +
> + @retval EFI_SUCCESS The function completed successfully.
> + @retval EFI_INVALID_PARAMETER Invalid parameter.
> + @retval EFI_OUT_OF_RESOURCES Could not allocate memory.
> +**/
> +EFI_STATUS
> +EFIAPI
> +AmlCodeGenEndTag (
> + IN UINT8 CheckSum, OPTIONAL
> + IN AML_OBJECT_NODE * ParentNode, OPTIONAL
> + OUT AML_DATA_NODE ** NewRdNode OPTIONAL
> + );
> +
> #endif // AML_RESOURCE_DATA_CODE_GEN_H_
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